diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/Kconfig | 66 | ||||
| -rw-r--r-- | drivers/base/Makefile | 2 | ||||
| -rw-r--r-- | drivers/base/devres.c | 1 | ||||
| -rw-r--r-- | drivers/base/devtmpfs.c | 340 | ||||
| -rw-r--r-- | drivers/base/firmware_class.c | 11 | ||||
| -rw-r--r-- | drivers/base/iommu.c | 124 | ||||
| -rw-r--r-- | drivers/base/memory.c | 3 | ||||
| -rw-r--r-- | drivers/base/platform.c | 23 | ||||
| -rw-r--r-- | drivers/base/power/Makefile | 1 | ||||
| -rw-r--r-- | drivers/base/power/clock_ops.c | 244 | ||||
| -rw-r--r-- | drivers/base/power/domain.c | 1272 | ||||
| -rw-r--r-- | drivers/base/power/generic_ops.c | 98 | ||||
| -rw-r--r-- | drivers/base/power/main.c | 87 | ||||
| -rw-r--r-- | drivers/base/power/opp.c | 19 | ||||
| -rw-r--r-- | drivers/base/power/runtime.c | 99 | ||||
| -rw-r--r-- | drivers/base/power/sysfs.c | 8 | ||||
| -rw-r--r-- | drivers/base/power/trace.c | 2 | ||||
| -rw-r--r-- | drivers/base/regmap/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/base/regmap/Makefile | 3 | ||||
| -rw-r--r-- | drivers/base/regmap/regmap-i2c.c | 116 | ||||
| -rw-r--r-- | drivers/base/regmap/regmap-spi.c | 75 | ||||
| -rw-r--r-- | drivers/base/regmap/regmap.c | 455 | ||||
| -rw-r--r-- | drivers/base/syscore.c | 8 |
23 files changed, 2580 insertions, 490 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index d57e8d0fb823..21cf46f45245 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -16,6 +16,11 @@ config UEVENT_HELPER_PATH that it creates a high system load, or on smaller systems it is known to create out-of-memory situations during bootup. + To disable user space helper program execution at early boot + time specify an empty string here. This setting can be altered + via /proc/sys/kernel/hotplug or via /sys/kernel/uevent_helper + later at runtime. + config DEVTMPFS bool "Maintain a devtmpfs filesystem to mount at /dev" depends on HOTPLUG @@ -65,17 +70,17 @@ config PREVENT_FIRMWARE_BUILD default y help Say yes to avoid building firmware. Firmware is usually shipped - with the driver, and only when updating the firmware a rebuild - should be made. - If unsure say Y here. + with the driver and only when updating the firmware should a + rebuild be made. + If unsure, say Y here. config FW_LOADER tristate "Userspace firmware loading support" if EXPERT default y ---help--- - This option is provided for the case where no in-kernel-tree modules - require userspace firmware loading support, but a module built outside - the kernel tree does. + This option is provided for the case where none of the in-tree modules + require userspace firmware loading support, but a module built + out-of-tree does. config FIRMWARE_IN_KERNEL bool "Include in-kernel firmware blobs in kernel binary" @@ -83,22 +88,22 @@ config FIRMWARE_IN_KERNEL default y help The kernel source tree includes a number of firmware 'blobs' - which are used by various drivers. The recommended way to - use these is to run "make firmware_install" and to copy the - resulting binary files created in usr/lib/firmware directory - of the kernel tree to the /lib/firmware on your system so + that are used by various drivers. The recommended way to + use these is to run "make firmware_install", which, after + converting ihex files to binary, copies all of the needed + binary files in firmware/ to /lib/firmware/ on your system so that they can be loaded by userspace helpers on request. Enabling this option will build each required firmware blob into the kernel directly, where request_firmware() will find them without having to call out to userspace. This may be - useful if your root file system requires a device which uses - such firmware, and do not wish to use an initrd. + useful if your root file system requires a device that uses + such firmware and do not wish to use an initrd. This single option controls the inclusion of firmware for - every driver which uses request_firmware() and ships its - firmware in the kernel source tree, to avoid a proliferation - of 'Include firmware for xxx device' options. + every driver that uses request_firmware() and ships its + firmware in the kernel source tree, which avoids a + proliferation of 'Include firmware for xxx device' options. Say 'N' and let firmware be loaded from userspace. @@ -106,27 +111,27 @@ config EXTRA_FIRMWARE string "External firmware blobs to build into the kernel binary" depends on FW_LOADER help - This option allows firmware to be built into the kernel, for the - cases where the user either cannot or doesn't want to provide it from + This option allows firmware to be built into the kernel for the case + where the user either cannot or doesn't want to provide it from userspace at runtime (for example, when the firmware in question is required for accessing the boot device, and the user doesn't want to use an initrd). - This option is a string, and takes the (space-separated) names of the - firmware files -- the same names which appear in MODULE_FIRMWARE() + This option is a string and takes the (space-separated) names of the + firmware files -- the same names that appear in MODULE_FIRMWARE() and request_firmware() in the source. These files should exist under the directory specified by the EXTRA_FIRMWARE_DIR option, which is - by default the firmware/ subdirectory of the kernel source tree. + by default the firmware subdirectory of the kernel source tree. - So, for example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", - copy the usb8388.bin file into the firmware/ directory, and build the - kernel. Then any request_firmware("usb8388.bin") will be - satisfied internally without needing to call out to userspace. + For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy + the usb8388.bin file into the firmware directory, and build the kernel. + Then any request_firmware("usb8388.bin") will be satisfied internally + without needing to call out to userspace. WARNING: If you include additional firmware files into your binary - kernel image which are not available under the terms of the GPL, + kernel image that are not available under the terms of the GPL, then it may be a violation of the GPL to distribute the resulting - image -- since it combines both GPL and non-GPL work. You should + image since it combines both GPL and non-GPL work. You should consult a lawyer of your own before distributing such an image. config EXTRA_FIRMWARE_DIR @@ -136,10 +141,9 @@ config EXTRA_FIRMWARE_DIR help This option controls the directory in which the kernel build system looks for the firmware files listed in the EXTRA_FIRMWARE option. - The default is the firmware/ directory in the kernel source tree, - but by changing this option you can point it elsewhere, such as - the /lib/firmware/ directory or another separate directory - containing firmware files. + The default is firmware/ in the kernel source tree, but by changing + this option you can point it elsewhere, such as /lib/firmware/ or + some other directory containing the firmware files. config DEBUG_DRIVER bool "Driver Core verbose debug messages" @@ -168,4 +172,6 @@ config SYS_HYPERVISOR bool default n +source "drivers/base/regmap/Kconfig" + endmenu diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 4c5701c15f53..99a375ad2cc9 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -13,11 +13,11 @@ obj-$(CONFIG_FW_LOADER) += firmware_class.o obj-$(CONFIG_NUMA) += node.o obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o obj-$(CONFIG_SMP) += topology.o -obj-$(CONFIG_IOMMU_API) += iommu.o ifeq ($(CONFIG_SYSFS),y) obj-$(CONFIG_MODULES) += module.o endif obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o +obj-$(CONFIG_REGMAP) += regmap/ ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG diff --git a/drivers/base/devres.c b/drivers/base/devres.c index cf7a0c788052..65cd74832450 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -397,6 +397,7 @@ static int remove_nodes(struct device *dev, static int release_nodes(struct device *dev, struct list_head *first, struct list_head *end, unsigned long flags) + __releases(&dev->devres_lock) { LIST_HEAD(todo); int cnt; diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 82bbb5967aa9..a4760e095ff5 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -21,12 +21,11 @@ #include <linux/fs.h> #include <linux/shmem_fs.h> #include <linux/ramfs.h> -#include <linux/cred.h> #include <linux/sched.h> -#include <linux/init_task.h> #include <linux/slab.h> +#include <linux/kthread.h> -static struct vfsmount *dev_mnt; +static struct task_struct *thread; #if defined CONFIG_DEVTMPFS_MOUNT static int mount_dev = 1; @@ -34,7 +33,16 @@ static int mount_dev = 1; static int mount_dev; #endif -static DEFINE_MUTEX(dirlock); +static DEFINE_SPINLOCK(req_lock); + +static struct req { + struct req *next; + struct completion done; + int err; + const char *name; + mode_t mode; /* 0 => delete */ + struct device *dev; +} *requests; static int __init mount_param(char *str) { @@ -68,131 +76,152 @@ static inline int is_blockdev(struct device *dev) static inline int is_blockdev(struct device *dev) { return 0; } #endif -static int dev_mkdir(const char *name, mode_t mode) +int devtmpfs_create_node(struct device *dev) { - struct nameidata nd; - struct dentry *dentry; - int err; + const char *tmp = NULL; + struct req req; - err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - name, LOOKUP_PARENT, &nd); - if (err) - return err; + if (!thread) + return 0; - dentry = lookup_create(&nd, 1); - if (!IS_ERR(dentry)) { - err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode); - if (!err) - /* mark as kernel-created inode */ - dentry->d_inode->i_private = &dev_mnt; - dput(dentry); - } else { - err = PTR_ERR(dentry); - } + req.mode = 0; + req.name = device_get_devnode(dev, &req.mode, &tmp); + if (!req.name) + return -ENOMEM; - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); - path_put(&nd.path); - return err; + if (req.mode == 0) + req.mode = 0600; + if (is_blockdev(dev)) + req.mode |= S_IFBLK; + else + req.mode |= S_IFCHR; + + req.dev = dev; + + init_completion(&req.done); + + spin_lock(&req_lock); + req.next = requests; + requests = &req; + spin_unlock(&req_lock); + + wake_up_process(thread); + wait_for_completion(&req.done); + + kfree(tmp); + + return req.err; } -static int create_path(const char *nodepath) +int devtmpfs_delete_node(struct device *dev) { - int err; + const char *tmp = NULL; + struct req req; - mutex_lock(&dirlock); - err = dev_mkdir(nodepath, 0755); - if (err == -ENOENT) { - char *path; - char *s; - - /* parent directories do not exist, create them */ - path = kstrdup(nodepath, GFP_KERNEL); - if (!path) { - err = -ENOMEM; - goto out; - } - s = path; - for (;;) { - s = strchr(s, '/'); - if (!s) - break; - s[0] = '\0'; - err = dev_mkdir(path, 0755); - if (err && err != -EEXIST) - break; - s[0] = '/'; - s++; - } - kfree(path); - } -out: - mutex_unlock(&dirlock); - return err; + if (!thread) + return 0; + + req.name = device_get_devnode(dev, NULL, &tmp); + if (!req.name) + return -ENOMEM; + + req.mode = 0; + req.dev = dev; + + init_completion(&req.done); + + spin_lock(&req_lock); + req.next = requests; + requests = &req; + spin_unlock(&req_lock); + + wake_up_process(thread); + wait_for_completion(&req.done); + + kfree(tmp); + return req.err; } -int devtmpfs_create_node(struct device *dev) +static int dev_mkdir(const char *name, mode_t mode) { - const char *tmp = NULL; - const char *nodename; - const struct cred *curr_cred; - mode_t mode = 0; - struct nameidata nd; struct dentry *dentry; + struct path path; int err; - if (!dev_mnt) - return 0; + dentry = kern_path_create(AT_FDCWD, name, &path, 1); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + + err = vfs_mkdir(path.dentry->d_inode, dentry, mode); + if (!err) + /* mark as kernel-created inode */ + dentry->d_inode->i_private = &thread; + dput(dentry); + mutex_unlock(&path.dentry->d_inode->i_mutex); + path_put(&path); + return err; +} - nodename = device_get_devnode(dev, &mode, &tmp); - if (!nodename) +static int create_path(const char *nodepath) +{ + char *path; + char *s; + int err = 0; + + /* parent directories do not exist, create them */ + path = kstrdup(nodepath, GFP_KERNEL); + if (!path) return -ENOMEM; - if (mode == 0) - mode = 0600; - if (is_blockdev(dev)) - mode |= S_IFBLK; - else - mode |= S_IFCHR; + s = path; + for (;;) { + s = strchr(s, '/'); + if (!s) + break; + s[0] = '\0'; + err = dev_mkdir(path, 0755); + if (err && err != -EEXIST) + break; + s[0] = '/'; + s++; + } + kfree(path); + return err; +} - curr_cred = override_creds(&init_cred); +static int handle_create(const char *nodename, mode_t mode, struct device *dev) +{ + struct dentry *dentry; + struct path path; + int err; - err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - nodename, LOOKUP_PARENT, &nd); - if (err == -ENOENT) { + dentry = kern_path_create(AT_FDCWD, nodename, &path, 0); + if (dentry == ERR_PTR(-ENOENT)) { create_path(nodename); - err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - nodename, LOOKUP_PARENT, &nd); + dentry = kern_path_create(AT_FDCWD, nodename, &path, 0); } - if (err) - goto out; - - dentry = lookup_create(&nd, 0); - if (!IS_ERR(dentry)) { - err = vfs_mknod(nd.path.dentry->d_inode, - dentry, mode, dev->devt); - if (!err) { - struct iattr newattrs; - - /* fixup possibly umasked mode */ - newattrs.ia_mode = mode; - newattrs.ia_valid = ATTR_MODE; - mutex_lock(&dentry->d_inode->i_mutex); - notify_change(dentry, &newattrs); - mutex_unlock(&dentry->d_inode->i_mutex); - - /* mark as kernel-created inode */ - dentry->d_inode->i_private = &dev_mnt; - } - dput(dentry); - } else { - err = PTR_ERR(dentry); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + + err = vfs_mknod(path.dentry->d_inode, + dentry, mode, dev->devt); + if (!err) { + struct iattr newattrs; + + /* fixup possibly umasked mode */ + newattrs.ia_mode = mode; + newattrs.ia_valid = ATTR_MODE; + mutex_lock(&dentry->d_inode->i_mutex); + notify_change(dentry, &newattrs); + mutex_unlock(&dentry->d_inode->i_mutex); + + /* mark as kernel-created inode */ + dentry->d_inode->i_private = &thread; } + dput(dentry); - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); - path_put(&nd.path); -out: - kfree(tmp); - revert_creds(curr_cred); + mutex_unlock(&path.dentry->d_inode->i_mutex); + path_put(&path); return err; } @@ -202,8 +231,7 @@ static int dev_rmdir(const char *name) struct dentry *dentry; int err; - err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - name, LOOKUP_PARENT, &nd); + err = kern_path_parent(name, &nd); if (err) return err; @@ -211,7 +239,7 @@ static int dev_rmdir(const char *name) dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); if (!IS_ERR(dentry)) { if (dentry->d_inode) { - if (dentry->d_inode->i_private == &dev_mnt) + if (dentry->d_inode->i_private == &thread) err = vfs_rmdir(nd.path.dentry->d_inode, dentry); else @@ -238,7 +266,6 @@ static int delete_path(const char *nodepath) if (!path) return -ENOMEM; - mutex_lock(&dirlock); for (;;) { char *base; @@ -250,7 +277,6 @@ static int delete_path(const char *nodepath) if (err) break; } - mutex_unlock(&dirlock); kfree(path); return err; @@ -259,7 +285,7 @@ static int delete_path(const char *nodepath) static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *stat) { /* did we create it */ - if (inode->i_private != &dev_mnt) + if (inode->i_private != &thread) return 0; /* does the dev_t match */ @@ -277,29 +303,17 @@ static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *sta return 1; } -int devtmpfs_delete_node(struct device *dev) +static int handle_remove(const char *nodename, struct device *dev) { - const char *tmp = NULL; - const char *nodename; - const struct cred *curr_cred; struct nameidata nd; struct dentry *dentry; struct kstat stat; int deleted = 1; int err; - if (!dev_mnt) - return 0; - - nodename = device_get_devnode(dev, NULL, &tmp); - if (!nodename) - return -ENOMEM; - - curr_cred = override_creds(&init_cred); - err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, - nodename, LOOKUP_PARENT, &nd); + err = kern_path_parent(nodename, &nd); if (err) - goto out; + return err; mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); @@ -337,9 +351,6 @@ int devtmpfs_delete_node(struct device *dev) path_put(&nd.path); if (deleted && strchr(nodename, '/')) delete_path(nodename); -out: - kfree(tmp); - revert_creds(curr_cred); return err; } @@ -354,7 +365,7 @@ int devtmpfs_mount(const char *mntdir) if (!mount_dev) return 0; - if (!dev_mnt) + if (!thread) return 0; err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL); @@ -365,31 +376,80 @@ int devtmpfs_mount(const char *mntdir) return err; } +static DECLARE_COMPLETION(setup_done); + +static int handle(const char *name, mode_t mode, struct device *dev) +{ + if (mode) + return handle_create(name, mode, dev); + else + return handle_remove(name, dev); +} + +static int devtmpfsd(void *p) +{ + char options[] = "mode=0755"; + int *err = p; + *err = sys_unshare(CLONE_NEWNS); + if (*err) + goto out; + *err = sys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options); + if (*err) + goto out; + sys_chdir("/.."); /* will traverse into overmounted root */ + sys_chroot("."); + complete(&setup_done); + while (1) { + spin_lock(&req_lock); + while (requests) { + struct req *req = requests; + requests = NULL; + spin_unlock(&req_lock); + while (req) { + struct req *next = req->next; + req->err = handle(req->name, req->mode, req->dev); + complete(&req->done); + req = next; + } + spin_lock(&req_lock); + } + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock(&req_lock); + schedule(); + __set_current_state(TASK_RUNNING); + } + return 0; +out: + complete(&setup_done); + return *err; +} + /* * Create devtmpfs instance, driver-core devices will add their device * nodes here. */ int __init devtmpfs_init(void) { - int err; - struct vfsmount *mnt; - char options[] = "mode=0755"; - - err = register_filesystem(&dev_fs_type); + int err = register_filesystem(&dev_fs_type); if (err) { printk(KERN_ERR "devtmpfs: unable to register devtmpfs " "type %i\n", err); return err; } - mnt = kern_mount_data(&dev_fs_type, options); - if (IS_ERR(mnt)) { - err = PTR_ERR(mnt); + thread = kthread_run(devtmpfsd, &err, "kdevtmpfs"); + if (!IS_ERR(thread)) { + wait_for_completion(&setup_done); + } else { + err = PTR_ERR(thread); + thread = NULL; + } + + if (err) { printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err); unregister_filesystem(&dev_fs_type); return err; } - dev_mnt = mnt; printk(KERN_INFO "devtmpfs: initialized\n"); return 0; diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index bbb03e6f7255..06ed6b4e7df5 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -521,11 +521,6 @@ static int _request_firmware(const struct firmware **firmware_p, if (!firmware_p) return -EINVAL; - if (WARN_ON(usermodehelper_is_disabled())) { - dev_err(device, "firmware: %s will not be loaded\n", name); - return -EBUSY; - } - *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL); if (!firmware) { dev_err(device, "%s: kmalloc(struct firmware) failed\n", @@ -539,6 +534,12 @@ static int _request_firmware(const struct firmware **firmware_p, return 0; } + if (WARN_ON(usermodehelper_is_disabled())) { + dev_err(device, "firmware: %s will not be loaded\n", name); + retval = -EBUSY; + goto out; + } + if (uevent) dev_dbg(device, "firmware: requesting %s\n", name); diff --git a/drivers/base/iommu.c b/drivers/base/iommu.c deleted file mode 100644 index 6e6b6a11b3ce..000000000000 --- a/drivers/base/iommu.c +++ /dev/null @@ -1,124 +0,0 @@ -/* - * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. - * Author: Joerg Roedel <joerg.roedel@amd.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/bug.h> -#include <linux/types.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/errno.h> -#include <linux/iommu.h> - -static struct iommu_ops *iommu_ops; - -void register_iommu(struct iommu_ops *ops) -{ - if (iommu_ops) - BUG(); - - iommu_ops = ops; -} - -bool iommu_found(void) -{ - return iommu_ops != NULL; -} -EXPORT_SYMBOL_GPL(iommu_found); - -struct iommu_domain *iommu_domain_alloc(void) -{ - struct iommu_domain *domain; - int ret; - - domain = kmalloc(sizeof(*domain), GFP_KERNEL); - if (!domain) - return NULL; - - ret = iommu_ops->domain_init(domain); - if (ret) - goto out_free; - - return domain; - -out_free: - kfree(domain); - - return NULL; -} -EXPORT_SYMBOL_GPL(iommu_domain_alloc); - -void iommu_domain_free(struct iommu_domain *domain) -{ - iommu_ops->domain_destroy(domain); - kfree(domain); -} -EXPORT_SYMBOL_GPL(iommu_domain_free); - -int iommu_attach_device(struct iommu_domain *domain, struct device *dev) -{ - return iommu_ops->attach_dev(domain, dev); -} -EXPORT_SYMBOL_GPL(iommu_attach_device); - -void iommu_detach_device(struct iommu_domain *domain, struct device *dev) -{ - iommu_ops->detach_dev(domain, dev); -} -EXPORT_SYMBOL_GPL(iommu_detach_device); - -phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, - unsigned long iova) -{ - return iommu_ops->iova_to_phys(domain, iova); -} -EXPORT_SYMBOL_GPL(iommu_iova_to_phys); - -int iommu_domain_has_cap(struct iommu_domain *domain, - unsigned long cap) -{ - return iommu_ops->domain_has_cap(domain, cap); -} -EXPORT_SYMBOL_GPL(iommu_domain_has_cap); - -int iommu_map(struct iommu_domain *domain, unsigned long iova, - phys_addr_t paddr, int gfp_order, int prot) -{ - unsigned long invalid_mask; - size_t size; - - size = 0x1000UL << gfp_order; - invalid_mask = size - 1; - - BUG_ON((iova | paddr) & invalid_mask); - - return iommu_ops->map(domain, iova, paddr, gfp_order, prot); -} -EXPORT_SYMBOL_GPL(iommu_map); - -int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order) -{ - unsigned long invalid_mask; - size_t size; - - size = 0x1000UL << gfp_order; - invalid_mask = size - 1; - - BUG_ON(iova & invalid_mask); - - return iommu_ops->unmap(domain, iova, gfp_order); -} -EXPORT_SYMBOL_GPL(iommu_unmap); diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 9f9b2359f718..2840ed4668c1 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -24,13 +24,12 @@ #include <linux/stat.h> #include <linux/slab.h> -#include <asm/atomic.h> +#include <linux/atomic.h> #include <asm/uaccess.h> static DEFINE_MUTEX(mem_sysfs_mutex); #define MEMORY_CLASS_NAME "memory" -#define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) static int sections_per_block; diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 1c291af637b3..99a5272d7c2f 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -32,6 +32,25 @@ struct device platform_bus = { EXPORT_SYMBOL_GPL(platform_bus); /** + * arch_setup_pdev_archdata - Allow manipulation of archdata before its used + * @pdev: platform device + * + * This is called before platform_device_add() such that any pdev_archdata may + * be setup before the platform_notifier is called. So if a user needs to + * manipulate any relevant information in the pdev_archdata they can do: + * + * platform_devic_alloc() + * ... manipulate ... + * platform_device_add() + * + * And if they don't care they can just call platform_device_register() and + * everything will just work out. + */ +void __weak arch_setup_pdev_archdata(struct platform_device *pdev) +{ +} + +/** * platform_get_resource - get a resource for a device * @dev: platform device * @type: resource type @@ -173,6 +192,7 @@ struct platform_device *platform_device_alloc(const char *name, int id) pa->pdev.id = id; device_initialize(&pa->pdev.dev); pa->pdev.dev.release = platform_device_release; + arch_setup_pdev_archdata(&pa->pdev); } return pa ? &pa->pdev : NULL; @@ -334,6 +354,7 @@ EXPORT_SYMBOL_GPL(platform_device_del); int platform_device_register(struct platform_device *pdev) { device_initialize(&pdev->dev); + arch_setup_pdev_archdata(pdev); return platform_device_add(pdev); } EXPORT_SYMBOL_GPL(platform_device_register); @@ -367,7 +388,7 @@ EXPORT_SYMBOL_GPL(platform_device_unregister); * * Returns &struct platform_device pointer on success, or ERR_PTR() on error. */ -struct platform_device *__init_or_module platform_device_register_resndata( +struct platform_device *platform_device_register_resndata( struct device *parent, const char *name, int id, const struct resource *res, unsigned int num, diff --git a/drivers/base/power/Makefile b/drivers/base/power/Makefile index 3647e114d0e7..2639ae79a372 100644 --- a/drivers/base/power/Makefile +++ b/drivers/base/power/Makefile @@ -3,6 +3,7 @@ obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o obj-$(CONFIG_PM_RUNTIME) += runtime.o obj-$(CONFIG_PM_TRACE_RTC) += trace.o obj-$(CONFIG_PM_OPP) += opp.o +obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o obj-$(CONFIG_HAVE_CLK) += clock_ops.o ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
\ No newline at end of file diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c index eaa8a854af03..2c18d584066d 100644 --- a/drivers/base/power/clock_ops.c +++ b/drivers/base/power/clock_ops.c @@ -15,11 +15,11 @@ #include <linux/slab.h> #include <linux/err.h> -#ifdef CONFIG_PM_RUNTIME +#ifdef CONFIG_PM -struct pm_runtime_clk_data { +struct pm_clk_data { struct list_head clock_list; - struct mutex lock; + spinlock_t lock; }; enum pce_status { @@ -36,25 +36,25 @@ struct pm_clock_entry { enum pce_status status; }; -static struct pm_runtime_clk_data *__to_prd(struct device *dev) +static struct pm_clk_data *__to_pcd(struct device *dev) { return dev ? dev->power.subsys_data : NULL; } /** - * pm_runtime_clk_add - Start using a device clock for runtime PM. - * @dev: Device whose clock is going to be used for runtime PM. + * pm_clk_add - Start using a device clock for power management. + * @dev: Device whose clock is going to be used for power management. * @con_id: Connection ID of the clock. * * Add the clock represented by @con_id to the list of clocks used for - * the runtime PM of @dev. + * the power management of @dev. */ -int pm_runtime_clk_add(struct device *dev, const char *con_id) +int pm_clk_add(struct device *dev, const char *con_id) { - struct pm_runtime_clk_data *prd = __to_prd(dev); + struct pm_clk_data *pcd = __to_pcd(dev); struct pm_clock_entry *ce; - if (!prd) + if (!pcd) return -EINVAL; ce = kzalloc(sizeof(*ce), GFP_KERNEL); @@ -73,20 +73,20 @@ int pm_runtime_clk_add(struct device *dev, const char *con_id) } } - mutex_lock(&prd->lock); - list_add_tail(&ce->node, &prd->clock_list); - mutex_unlock(&prd->lock); + spin_lock_irq(&pcd->lock); + list_add_tail(&ce->node, &pcd->clock_list); + spin_unlock_irq(&pcd->lock); return 0; } /** - * __pm_runtime_clk_remove - Destroy runtime PM clock entry. - * @ce: Runtime PM clock entry to destroy. + * __pm_clk_remove - Destroy PM clock entry. + * @ce: PM clock entry to destroy. * - * This routine must be called under the mutex protecting the runtime PM list - * of clocks corresponding the the @ce's device. + * This routine must be called under the spinlock protecting the PM list of + * clocks corresponding the the @ce's device. */ -static void __pm_runtime_clk_remove(struct pm_clock_entry *ce) +static void __pm_clk_remove(struct pm_clock_entry *ce) { if (!ce) return; @@ -108,95 +108,99 @@ static void __pm_runtime_clk_remove(struct pm_clock_entry *ce) } /** - * pm_runtime_clk_remove - Stop using a device clock for runtime PM. - * @dev: Device whose clock should not be used for runtime PM any more. + * pm_clk_remove - Stop using a device clock for power management. + * @dev: Device whose clock should not be used for PM any more. * @con_id: Connection ID of the clock. * * Remove the clock represented by @con_id from the list of clocks used for - * the runtime PM of @dev. + * the power management of @dev. */ -void pm_runtime_clk_remove(struct device *dev, const char *con_id) +void pm_clk_remove(struct device *dev, const char *con_id) { - struct pm_runtime_clk_data *prd = __to_prd(dev); + struct pm_clk_data *pcd = __to_pcd(dev); struct pm_clock_entry *ce; - if (!prd) + if (!pcd) return; - mutex_lock(&prd->lock); + spin_lock_irq(&pcd->lock); - list_for_each_entry(ce, &prd->clock_list, node) { + list_for_each_entry(ce, &pcd->clock_list, node) { if (!con_id && !ce->con_id) { - __pm_runtime_clk_remove(ce); + __pm_clk_remove(ce); break; } else if (!con_id || !ce->con_id) { continue; } else if (!strcmp(con_id, ce->con_id)) { - __pm_runtime_clk_remove(ce); + __pm_clk_remove(ce); break; } } - mutex_unlock(&prd->lock); + spin_unlock_irq(&pcd->lock); } /** - * pm_runtime_clk_init - Initialize a device's list of runtime PM clocks. - * @dev: Device to initialize the list of runtime PM clocks for. + * pm_clk_init - Initialize a device's list of power management clocks. + * @dev: Device to initialize the list of PM clocks for. * - * Allocate a struct pm_runtime_clk_data object, initialize its lock member and + * Allocate a struct pm_clk_data object, initialize its lock member and * make the @dev's power.subsys_data field point to it. */ -int pm_runtime_clk_init(struct device *dev) +int pm_clk_init(struct device *dev) { - struct pm_runtime_clk_data *prd; + struct pm_clk_data *pcd; - prd = kzalloc(sizeof(*prd), GFP_KERNEL); - if (!prd) { - dev_err(dev, "Not enough memory fo runtime PM data.\n"); + pcd = kzalloc(sizeof(*pcd), GFP_KERNEL); + if (!pcd) { + dev_err(dev, "Not enough memory for PM clock data.\n"); return -ENOMEM; } - INIT_LIST_HEAD(&prd->clock_list); - mutex_init(&prd->lock); - dev->power.subsys_data = prd; + INIT_LIST_HEAD(&pcd->clock_list); + spin_lock_init(&pcd->lock); + dev->power.subsys_data = pcd; return 0; } /** - * pm_runtime_clk_destroy - Destroy a device's list of runtime PM clocks. - * @dev: Device to destroy the list of runtime PM clocks for. + * pm_clk_destroy - Destroy a device's list of power management clocks. + * @dev: Device to destroy the list of PM clocks for. * * Clear the @dev's power.subsys_data field, remove the list of clock entries - * from the struct pm_runtime_clk_data object pointed to by it before and free + * from the struct pm_clk_data object pointed to by it before and free * that object. */ -void pm_runtime_clk_destroy(struct device *dev) +void pm_clk_destroy(struct device *dev) { - struct pm_runtime_clk_data *prd = __to_prd(dev); + struct pm_clk_data *pcd = __to_pcd(dev); struct pm_clock_entry *ce, *c; - if (!prd) + if (!pcd) return; dev->power.subsys_data = NULL; - mutex_lock(&prd->lock); + spin_lock_irq(&pcd->lock); - list_for_each_entry_safe_reverse(ce, c, &prd->clock_list, node) - __pm_runtime_clk_remove(ce); + list_for_each_entry_safe_reverse(ce, c, &pcd->clock_list, node) + __pm_clk_remove(ce); - mutex_unlock(&prd->lock); + spin_unlock_irq(&pcd->lock); - kfree(prd); + kfree(pcd); } +#endif /* CONFIG_PM */ + +#ifdef CONFIG_PM_RUNTIME + /** - * pm_runtime_clk_acquire - Acquire a device clock. + * pm_clk_acquire - Acquire a device clock. * @dev: Device whose clock is to be acquired. * @con_id: Connection ID of the clock. */ -static void pm_runtime_clk_acquire(struct device *dev, +static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce) { ce->clk = clk_get(dev, ce->con_id); @@ -209,24 +213,25 @@ static void pm_runtime_clk_acquire(struct device *dev, } /** - * pm_runtime_clk_suspend - Disable clocks in a device's runtime PM clock list. + * pm_clk_suspend - Disable clocks in a device's PM clock list. * @dev: Device to disable the clocks for. */ -int pm_runtime_clk_suspend(struct device *dev) +int pm_clk_suspend(struct device *dev) { - struct pm_runtime_clk_data *prd = __to_prd(dev); + struct pm_clk_data *pcd = __to_pcd(dev); struct pm_clock_entry *ce; + unsigned long flags; dev_dbg(dev, "%s()\n", __func__); - if (!prd) + if (!pcd) return 0; - mutex_lock(&prd->lock); + spin_lock_irqsave(&pcd->lock, flags); - list_for_each_entry_reverse(ce, &prd->clock_list, node) { + list_for_each_entry_reverse(ce, &pcd->clock_list, node) { if (ce->status == PCE_STATUS_NONE) - pm_runtime_clk_acquire(dev, ce); + pm_clk_acquire(dev, ce); if (ce->status < PCE_STATUS_ERROR) { clk_disable(ce->clk); @@ -234,30 +239,31 @@ int pm_runtime_clk_suspend(struct device *dev) } } - mutex_unlock(&prd->lock); + spin_unlock_irqrestore(&pcd->lock, flags); return 0; } /** - * pm_runtime_clk_resume - Enable clocks in a device's runtime PM clock list. + * pm_clk_resume - Enable clocks in a device's PM clock list. * @dev: Device to enable the clocks for. */ -int pm_runtime_clk_resume(struct device *dev) +int pm_clk_resume(struct device *dev) { - struct pm_runtime_clk_data *prd = __to_prd(dev); + struct pm_clk_data *pcd = __to_pcd(dev); struct pm_clock_entry *ce; + unsigned long flags; dev_dbg(dev, "%s()\n", __func__); - if (!prd) + if (!pcd) return 0; - mutex_lock(&prd->lock); + spin_lock_irqsave(&pcd->lock, flags); - list_for_each_entry(ce, &prd->clock_list, node) { + list_for_each_entry(ce, &pcd->clock_list, node) { if (ce->status == PCE_STATUS_NONE) - pm_runtime_clk_acquire(dev, ce); + pm_clk_acquire(dev, ce); if (ce->status < PCE_STATUS_ERROR) { clk_enable(ce->clk); @@ -265,28 +271,28 @@ int pm_runtime_clk_resume(struct device *dev) } } - mutex_unlock(&prd->lock); + spin_unlock_irqrestore(&pcd->lock, flags); return 0; } /** - * pm_runtime_clk_notify - Notify routine for device addition and removal. + * pm_clk_notify - Notify routine for device addition and removal. * @nb: Notifier block object this function is a member of. * @action: Operation being carried out by the caller. * @data: Device the routine is being run for. * * For this function to work, @nb must be a member of an object of type * struct pm_clk_notifier_block containing all of the requisite data. - * Specifically, the pwr_domain member of that object is copied to the device's - * pwr_domain field and its con_ids member is used to populate the device's list - * of runtime PM clocks, depending on @action. + * Specifically, the pm_domain member of that object is copied to the device's + * pm_domain field and its con_ids member is used to populate the device's list + * of PM clocks, depending on @action. * - * If the device's pwr_domain field is already populated with a value different + * If the device's pm_domain field is already populated with a value different * from the one stored in the struct pm_clk_notifier_block object, the function * does nothing. */ -static int pm_runtime_clk_notify(struct notifier_block *nb, +static int pm_clk_notify(struct notifier_block *nb, unsigned long action, void *data) { struct pm_clk_notifier_block *clknb; @@ -300,28 +306,28 @@ static int pm_runtime_clk_notify(struct notifier_block *nb, switch (action) { case BUS_NOTIFY_ADD_DEVICE: - if (dev->pwr_domain) + if (dev->pm_domain) break; - error = pm_runtime_clk_init(dev); + error = pm_clk_init(dev); if (error) break; - dev->pwr_domain = clknb->pwr_domain; + dev->pm_domain = clknb->pm_domain; if (clknb->con_ids[0]) { for (con_id = clknb->con_ids; *con_id; con_id++) - pm_runtime_clk_add(dev, *con_id); + pm_clk_add(dev, *con_id); } else { - pm_runtime_clk_add(dev, NULL); + pm_clk_add(dev, NULL); } break; case BUS_NOTIFY_DEL_DEVICE: - if (dev->pwr_domain != clknb->pwr_domain) + if (dev->pm_domain != clknb->pm_domain) break; - dev->pwr_domain = NULL; - pm_runtime_clk_destroy(dev); + dev->pm_domain = NULL; + pm_clk_destroy(dev); break; } @@ -330,6 +336,62 @@ static int pm_runtime_clk_notify(struct notifier_block *nb, #else /* !CONFIG_PM_RUNTIME */ +#ifdef CONFIG_PM + +/** + * pm_clk_suspend - Disable clocks in a device's PM clock list. + * @dev: Device to disable the clocks for. + */ +int pm_clk_suspend(struct device *dev) +{ + struct pm_clk_data *pcd = __to_pcd(dev); + struct pm_clock_entry *ce; + unsigned long flags; + + dev_dbg(dev, "%s()\n", __func__); + + /* If there is no driver, the clocks are already disabled. */ + if (!pcd || !dev->driver) + return 0; + + spin_lock_irqsave(&pcd->lock, flags); + + list_for_each_entry_reverse(ce, &pcd->clock_list, node) + clk_disable(ce->clk); + + spin_unlock_irqrestore(&pcd->lock, flags); + + return 0; +} + +/** + * pm_clk_resume - Enable clocks in a device's PM clock list. + * @dev: Device to enable the clocks for. + */ +int pm_clk_resume(struct device *dev) +{ + struct pm_clk_data *pcd = __to_pcd(dev); + struct pm_clock_entry *ce; + unsigned long flags; + + dev_dbg(dev, "%s()\n", __func__); + + /* If there is no driver, the clocks should remain disabled. */ + if (!pcd || !dev->driver) + return 0; + + spin_lock_irqsave(&pcd->lock, flags); + + list_for_each_entry(ce, &pcd->clock_list, node) + clk_enable(ce->clk); + + spin_unlock_irqrestore(&pcd->lock, flags); + + return 0; +} + +#endif /* CONFIG_PM */ + /** * enable_clock - Enable a device clock. * @dev: Device whose clock is to be enabled. @@ -365,7 +427,7 @@ static void disable_clock(struct device *dev, const char *con_id) } /** - * pm_runtime_clk_notify - Notify routine for device addition and removal. + * pm_clk_notify - Notify routine for device addition and removal. * @nb: Notifier block object this function is a member of. * @action: Operation being carried out by the caller. * @data: Device the routine is being run for. @@ -375,7 +437,7 @@ static void disable_clock(struct device *dev, const char *con_id) * Specifically, the con_ids member of that object is used to enable or disable * the device's clocks, depending on @action. */ -static int pm_runtime_clk_notify(struct notifier_block *nb, +static int pm_clk_notify(struct notifier_block *nb, unsigned long action, void *data) { struct pm_clk_notifier_block *clknb; @@ -387,7 +449,7 @@ static int pm_runtime_clk_notify(struct notifier_block *nb, clknb = container_of(nb, struct pm_clk_notifier_block, nb); switch (action) { - case BUS_NOTIFY_ADD_DEVICE: + case BUS_NOTIFY_BIND_DRIVER: if (clknb->con_ids[0]) { for (con_id = clknb->con_ids; *con_id; con_id++) enable_clock(dev, *con_id); @@ -395,7 +457,7 @@ static int pm_runtime_clk_notify(struct notifier_block *nb, enable_clock(dev, NULL); } break; - case BUS_NOTIFY_DEL_DEVICE: + case BUS_NOTIFY_UNBOUND_DRIVER: if (clknb->con_ids[0]) { for (con_id = clknb->con_ids; *con_id; con_id++) disable_clock(dev, *con_id); @@ -411,21 +473,21 @@ static int pm_runtime_clk_notify(struct notifier_block *nb, #endif /* !CONFIG_PM_RUNTIME */ /** - * pm_runtime_clk_add_notifier - Add bus type notifier for runtime PM clocks. + * pm_clk_add_notifier - Add bus type notifier for power management clocks. * @bus: Bus type to add the notifier to. * @clknb: Notifier to be added to the given bus type. * * The nb member of @clknb is not expected to be initialized and its - * notifier_call member will be replaced with pm_runtime_clk_notify(). However, + * notifier_call member will be replaced with pm_clk_notify(). However, * the remaining members of @clknb should be populated prior to calling this * routine. */ -void pm_runtime_clk_add_notifier(struct bus_type *bus, +void pm_clk_add_notifier(struct bus_type *bus, struct pm_clk_notifier_block *clknb) { if (!bus || !clknb) return; - clknb->nb.notifier_call = pm_runtime_clk_notify; + clknb->nb.notifier_call = pm_clk_notify; bus_register_notifier(bus, &clknb->nb); } diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c new file mode 100644 index 000000000000..1c374579407c --- /dev/null +++ b/drivers/base/power/domain.c @@ -0,0 +1,1272 @@ +/* + * drivers/base/power/domain.c - Common code related to device power domains. + * + * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. + * + * This file is released under the GPLv2. + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/pm_runtime.h> +#include <linux/pm_domain.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/sched.h> +#include <linux/suspend.h> + +static LIST_HEAD(gpd_list); +static DEFINE_MUTEX(gpd_list_lock); + +#ifdef CONFIG_PM + +static struct generic_pm_domain *dev_to_genpd(struct device *dev) +{ + if (IS_ERR_OR_NULL(dev->pm_domain)) + return ERR_PTR(-EINVAL); + + return pd_to_genpd(dev->pm_domain); +} + +static void genpd_sd_counter_dec(struct generic_pm_domain *genpd) +{ + if (!WARN_ON(genpd->sd_count == 0)) + genpd->sd_count--; +} + +static void genpd_acquire_lock(struct generic_pm_domain *genpd) +{ + DEFINE_WAIT(wait); + + mutex_lock(&genpd->lock); + /* + * Wait for the domain to transition into either the active, + * or the power off state. + */ + for (;;) { + prepare_to_wait(&genpd->status_wait_queue, &wait, + TASK_UNINTERRUPTIBLE); + if (genpd->status == GPD_STATE_ACTIVE + || genpd->status == GPD_STATE_POWER_OFF) + break; + mutex_unlock(&genpd->lock); + + schedule(); + + mutex_lock(&genpd->lock); + } + finish_wait(&genpd->status_wait_queue, &wait); +} + +static void genpd_release_lock(struct generic_pm_domain *genpd) +{ + mutex_unlock(&genpd->lock); +} + +static void genpd_set_active(struct generic_pm_domain *genpd) +{ + if (genpd->resume_count == 0) + genpd->status = GPD_STATE_ACTIVE; +} + +/** + * pm_genpd_poweron - Restore power to a given PM domain and its parents. + * @genpd: PM domain to power up. + * + * Restore power to @genpd and all of its parents so that it is possible to + * resume a device belonging to it. + */ +int pm_genpd_poweron(struct generic_pm_domain *genpd) +{ + struct generic_pm_domain *parent = genpd->parent; + int ret = 0; + + start: + if (parent) { + genpd_acquire_lock(parent); + mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); + } else { + mutex_lock(&genpd->lock); + } + + if (genpd->status == GPD_STATE_ACTIVE + || (genpd->prepared_count > 0 && genpd->suspend_power_off)) + goto out; + + if (genpd->status != GPD_STATE_POWER_OFF) { + genpd_set_active(genpd); + goto out; + } + + if (parent && parent->status != GPD_STATE_ACTIVE) { + mutex_unlock(&genpd->lock); + genpd_release_lock(parent); + + ret = pm_genpd_poweron(parent); + if (ret) + return ret; + + goto start; + } + + if (genpd->power_on) { + ret = genpd->power_on(genpd); + if (ret) + goto out; + } + + genpd_set_active(genpd); + if (parent) + parent->sd_count++; + + out: + mutex_unlock(&genpd->lock); + if (parent) + genpd_release_lock(parent); + + return ret; +} + +#endif /* CONFIG_PM */ + +#ifdef CONFIG_PM_RUNTIME + +/** + * __pm_genpd_save_device - Save the pre-suspend state of a device. + * @dle: Device list entry of the device to save the state of. + * @genpd: PM domain the device belongs to. + */ +static int __pm_genpd_save_device(struct dev_list_entry *dle, + struct generic_pm_domain *genpd) + __releases(&genpd->lock) __acquires(&genpd->lock) +{ + struct device *dev = dle->dev; + struct device_driver *drv = dev->driver; + int ret = 0; + + if (dle->need_restore) + return 0; + + mutex_unlock(&genpd->lock); + + if (drv && drv->pm && drv->pm->runtime_suspend) { + if (genpd->start_device) + genpd->start_device(dev); + + ret = drv->pm->runtime_suspend(dev); + + if (genpd->stop_device) + genpd->stop_device(dev); + } + + mutex_lock(&genpd->lock); + + if (!ret) + dle->need_restore = true; + + return ret; +} + +/** + * __pm_genpd_restore_device - Restore the pre-suspend state of a device. + * @dle: Device list entry of the device to restore the state of. + * @genpd: PM domain the device belongs to. + */ +static void __pm_genpd_restore_device(struct dev_list_entry *dle, + struct generic_pm_domain *genpd) + __releases(&genpd->lock) __acquires(&genpd->lock) +{ + struct device *dev = dle->dev; + struct device_driver *drv = dev->driver; + + if (!dle->need_restore) + return; + + mutex_unlock(&genpd->lock); + + if (drv && drv->pm && drv->pm->runtime_resume) { + if (genpd->start_device) + genpd->start_device(dev); + + drv->pm->runtime_resume(dev); + + if (genpd->stop_device) + genpd->stop_device(dev); + } + + mutex_lock(&genpd->lock); + + dle->need_restore = false; +} + +/** + * genpd_abort_poweroff - Check if a PM domain power off should be aborted. + * @genpd: PM domain to check. + * + * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during + * a "power off" operation, which means that a "power on" has occured in the + * meantime, or if its resume_count field is different from zero, which means + * that one of its devices has been resumed in the meantime. + */ +static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) +{ + return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; +} + +/** + * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). + * @genpd: PM domait to power off. + * + * Queue up the execution of pm_genpd_poweroff() unless it's already been done + * before. + */ +void genpd_queue_power_off_work(struct generic_pm_domain *genpd) +{ + if (!work_pending(&genpd->power_off_work)) + queue_work(pm_wq, &genpd->power_off_work); +} + +/** + * pm_genpd_poweroff - Remove power from a given PM domain. + * @genpd: PM domain to power down. + * + * If all of the @genpd's devices have been suspended and all of its subdomains + * have been powered down, run the runtime suspend callbacks provided by all of + * the @genpd's devices' drivers and remove power from @genpd. + */ +static int pm_genpd_poweroff(struct generic_pm_domain *genpd) + __releases(&genpd->lock) __acquires(&genpd->lock) +{ + struct generic_pm_domain *parent; + struct dev_list_entry *dle; + unsigned int not_suspended; + int ret = 0; + + start: + /* + * Do not try to power off the domain in the following situations: + * (1) The domain is already in the "power off" state. + * (2) System suspend is in progress. + * (3) One of the domain's devices is being resumed right now. + */ + if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0 + || genpd->resume_count > 0) + return 0; + + if (genpd->sd_count > 0) + return -EBUSY; + + not_suspended = 0; + list_for_each_entry(dle, &genpd->dev_list, node) + if (dle->dev->driver && !pm_runtime_suspended(dle->dev)) + not_suspended++; + + if (not_suspended > genpd->in_progress) + return -EBUSY; + + if (genpd->poweroff_task) { + /* + * Another instance of pm_genpd_poweroff() is executing + * callbacks, so tell it to start over and return. + */ + genpd->status = GPD_STATE_REPEAT; + return 0; + } + + if (genpd->gov && genpd->gov->power_down_ok) { + if (!genpd->gov->power_down_ok(&genpd->domain)) + return -EAGAIN; + } + + genpd->status = GPD_STATE_BUSY; + genpd->poweroff_task = current; + + list_for_each_entry_reverse(dle, &genpd->dev_list, node) { + ret = __pm_genpd_save_device(dle, genpd); + if (ret) { + genpd_set_active(genpd); + goto out; + } + + if (genpd_abort_poweroff(genpd)) + goto out; + + if (genpd->status == GPD_STATE_REPEAT) { + genpd->poweroff_task = NULL; + goto start; + } + } + + parent = genpd->parent; + if (parent) { + mutex_unlock(&genpd->lock); + + genpd_acquire_lock(parent); + mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING); + + if (genpd_abort_poweroff(genpd)) { + genpd_release_lock(parent); + goto out; + } + } + + if (genpd->power_off) { + ret = genpd->power_off(genpd); + if (ret == -EBUSY) { + genpd_set_active(genpd); + if (parent) + genpd_release_lock(parent); + + goto out; + } + } + + genpd->status = GPD_STATE_POWER_OFF; + + if (parent) { + genpd_sd_counter_dec(parent); + if (parent->sd_count == 0) + genpd_queue_power_off_work(parent); + + genpd_release_lock(parent); + } + + out: + genpd->poweroff_task = NULL; + wake_up_all(&genpd->status_wait_queue); + return ret; +} + +/** + * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. + * @work: Work structure used for scheduling the execution of this function. + */ +static void genpd_power_off_work_fn(struct work_struct *work) +{ + struct generic_pm_domain *genpd; + + genpd = container_of(work, struct generic_pm_domain, power_off_work); + + genpd_acquire_lock(genpd); + pm_genpd_poweroff(genpd); + genpd_release_lock(genpd); +} + +/** + * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. + * @dev: Device to suspend. + * + * Carry out a runtime suspend of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a PM domain consisting of I/O devices. + */ +static int pm_genpd_runtime_suspend(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->stop_device) { + int ret = genpd->stop_device(dev); + if (ret) + return ret; + } + + mutex_lock(&genpd->lock); + genpd->in_progress++; + pm_genpd_poweroff(genpd); + genpd->in_progress--; + mutex_unlock(&genpd->lock); + + return 0; +} + +/** + * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. + * @dev: Device to resume. + * @genpd: PM domain the device belongs to. + */ +static void __pm_genpd_runtime_resume(struct device *dev, + struct generic_pm_domain *genpd) +{ + struct dev_list_entry *dle; + + list_for_each_entry(dle, &genpd->dev_list, node) { + if (dle->dev == dev) { + __pm_genpd_restore_device(dle, genpd); + break; + } + } +} + +/** + * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. + * @dev: Device to resume. + * + * Carry out a runtime resume of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a PM domain consisting of I/O devices. + */ +static int pm_genpd_runtime_resume(struct device *dev) +{ + struct generic_pm_domain *genpd; + DEFINE_WAIT(wait); + int ret; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + ret = pm_genpd_poweron(genpd); + if (ret) + return ret; + + mutex_lock(&genpd->lock); + genpd->status = GPD_STATE_BUSY; + genpd->resume_count++; + for (;;) { + prepare_to_wait(&genpd->status_wait_queue, &wait, + TASK_UNINTERRUPTIBLE); + /* + * If current is the powering off task, we have been called + * reentrantly from one of the device callbacks, so we should + * not wait. + */ + if (!genpd->poweroff_task || genpd->poweroff_task == current) + break; + mutex_unlock(&genpd->lock); + + schedule(); + + mutex_lock(&genpd->lock); + } + finish_wait(&genpd->status_wait_queue, &wait); + __pm_genpd_runtime_resume(dev, genpd); + genpd->resume_count--; + genpd_set_active(genpd); + wake_up_all(&genpd->status_wait_queue); + mutex_unlock(&genpd->lock); + + if (genpd->start_device) + genpd->start_device(dev); + + return 0; +} + +/** + * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. + */ +void pm_genpd_poweroff_unused(void) +{ + struct generic_pm_domain *genpd; + + mutex_lock(&gpd_list_lock); + + list_for_each_entry(genpd, &gpd_list, gpd_list_node) + genpd_queue_power_off_work(genpd); + + mutex_unlock(&gpd_list_lock); +} + +#else + +static inline void genpd_power_off_work_fn(struct work_struct *work) {} +static inline void __pm_genpd_runtime_resume(struct device *dev, + struct generic_pm_domain *genpd) {} + +#define pm_genpd_runtime_suspend NULL +#define pm_genpd_runtime_resume NULL + +#endif /* CONFIG_PM_RUNTIME */ + +#ifdef CONFIG_PM_SLEEP + +/** + * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents. + * @genpd: PM domain to power off, if possible. + * + * Check if the given PM domain can be powered off (during system suspend or + * hibernation) and do that if so. Also, in that case propagate to its parent. + * + * This function is only called in "noirq" stages of system power transitions, + * so it need not acquire locks (all of the "noirq" callbacks are executed + * sequentially, so it is guaranteed that it will never run twice in parallel). + */ +static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) +{ + struct generic_pm_domain *parent = genpd->parent; + + if (genpd->status == GPD_STATE_POWER_OFF) + return; + + if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0) + return; + + if (genpd->power_off) + genpd->power_off(genpd); + + genpd->status = GPD_STATE_POWER_OFF; + if (parent) { + genpd_sd_counter_dec(parent); + pm_genpd_sync_poweroff(parent); + } +} + +/** + * resume_needed - Check whether to resume a device before system suspend. + * @dev: Device to check. + * @genpd: PM domain the device belongs to. + * + * There are two cases in which a device that can wake up the system from sleep + * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled + * to wake up the system and it has to remain active for this purpose while the + * system is in the sleep state and (2) if the device is not enabled to wake up + * the system from sleep states and it generally doesn't generate wakeup signals + * by itself (those signals are generated on its behalf by other parts of the + * system). In the latter case it may be necessary to reconfigure the device's + * wakeup settings during system suspend, because it may have been set up to + * signal remote wakeup from the system's working state as needed by runtime PM. + * Return 'true' in either of the above cases. + */ +static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) +{ + bool active_wakeup; + + if (!device_can_wakeup(dev)) + return false; + + active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev); + return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; +} + +/** + * pm_genpd_prepare - Start power transition of a device in a PM domain. + * @dev: Device to start the transition of. + * + * Start a power transition of a device (during a system-wide power transition) + * under the assumption that its pm_domain field points to the domain member of + * an object of type struct generic_pm_domain representing a PM domain + * consisting of I/O devices. + */ +static int pm_genpd_prepare(struct device *dev) +{ + struct generic_pm_domain *genpd; + int ret; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + /* + * If a wakeup request is pending for the device, it should be woken up + * at this point and a system wakeup event should be reported if it's + * set up to wake up the system from sleep states. + */ + pm_runtime_get_noresume(dev); + if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) + pm_wakeup_event(dev, 0); + + if (pm_wakeup_pending()) { + pm_runtime_put_sync(dev); + return -EBUSY; + } + + if (resume_needed(dev, genpd)) + pm_runtime_resume(dev); + + genpd_acquire_lock(genpd); + + if (genpd->prepared_count++ == 0) + genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; + + genpd_release_lock(genpd); + + if (genpd->suspend_power_off) { + pm_runtime_put_noidle(dev); + return 0; + } + + /* + * The PM domain must be in the GPD_STATE_ACTIVE state at this point, + * so pm_genpd_poweron() will return immediately, but if the device + * is suspended (e.g. it's been stopped by .stop_device()), we need + * to make it operational. + */ + pm_runtime_resume(dev); + __pm_runtime_disable(dev, false); + + ret = pm_generic_prepare(dev); + if (ret) { + mutex_lock(&genpd->lock); + + if (--genpd->prepared_count == 0) + genpd->suspend_power_off = false; + + mutex_unlock(&genpd->lock); + pm_runtime_enable(dev); + } + + pm_runtime_put_sync(dev); + return ret; +} + +/** + * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. + * @dev: Device to suspend. + * + * Suspend a device under the assumption that its pm_domain field points to the + * domain member of an object of type struct generic_pm_domain representing + * a PM domain consisting of I/O devices. + */ +static int pm_genpd_suspend(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); +} + +/** + * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain. + * @dev: Device to suspend. + * + * Carry out a late suspend of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a PM domain consisting of I/O devices. + */ +static int pm_genpd_suspend_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; + int ret; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->suspend_power_off) + return 0; + + ret = pm_generic_suspend_noirq(dev); + if (ret) + return ret; + + if (device_may_wakeup(dev) + && genpd->active_wakeup && genpd->active_wakeup(dev)) + return 0; + + if (genpd->stop_device) + genpd->stop_device(dev); + + /* + * Since all of the "noirq" callbacks are executed sequentially, it is + * guaranteed that this function will never run twice in parallel for + * the same PM domain, so it is not necessary to use locking here. + */ + genpd->suspended_count++; + pm_genpd_sync_poweroff(genpd); + + return 0; +} + +/** + * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain. + * @dev: Device to resume. + * + * Carry out an early resume of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a power domain consisting of I/O + * devices. + */ +static int pm_genpd_resume_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->suspend_power_off) + return 0; + + /* + * Since all of the "noirq" callbacks are executed sequentially, it is + * guaranteed that this function will never run twice in parallel for + * the same PM domain, so it is not necessary to use locking here. + */ + pm_genpd_poweron(genpd); + genpd->suspended_count--; + if (genpd->start_device) + genpd->start_device(dev); + + return pm_generic_resume_noirq(dev); +} + +/** + * pm_genpd_resume - Resume a device belonging to an I/O power domain. + * @dev: Device to resume. + * + * Resume a device under the assumption that its pm_domain field points to the + * domain member of an object of type struct generic_pm_domain representing + * a power domain consisting of I/O devices. + */ +static int pm_genpd_resume(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); +} + +/** + * pm_genpd_freeze - Freeze a device belonging to an I/O power domain. + * @dev: Device to freeze. + * + * Freeze a device under the assumption that its pm_domain field points to the + * domain member of an object of type struct generic_pm_domain representing + * a power domain consisting of I/O devices. + */ +static int pm_genpd_freeze(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); +} + +/** + * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain. + * @dev: Device to freeze. + * + * Carry out a late freeze of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a power domain consisting of I/O + * devices. + */ +static int pm_genpd_freeze_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; + int ret; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->suspend_power_off) + return 0; + + ret = pm_generic_freeze_noirq(dev); + if (ret) + return ret; + + if (genpd->stop_device) + genpd->stop_device(dev); + + return 0; +} + +/** + * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain. + * @dev: Device to thaw. + * + * Carry out an early thaw of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a power domain consisting of I/O + * devices. + */ +static int pm_genpd_thaw_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->suspend_power_off) + return 0; + + if (genpd->start_device) + genpd->start_device(dev); + + return pm_generic_thaw_noirq(dev); +} + +/** + * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. + * @dev: Device to thaw. + * + * Thaw a device under the assumption that its pm_domain field points to the + * domain member of an object of type struct generic_pm_domain representing + * a power domain consisting of I/O devices. + */ +static int pm_genpd_thaw(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); +} + +/** + * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain. + * @dev: Device to suspend. + * + * Power off a device under the assumption that its pm_domain field points to + * the domain member of an object of type struct generic_pm_domain representing + * a PM domain consisting of I/O devices. + */ +static int pm_genpd_dev_poweroff(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev); +} + +/** + * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain. + * @dev: Device to suspend. + * + * Carry out a late powering off of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a PM domain consisting of I/O devices. + */ +static int pm_genpd_dev_poweroff_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; + int ret; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + if (genpd->suspend_power_off) + return 0; + + ret = pm_generic_poweroff_noirq(dev); + if (ret) + return ret; + + if (device_may_wakeup(dev) + && genpd->active_wakeup && genpd->active_wakeup(dev)) + return 0; + + if (genpd->stop_device) + genpd->stop_device(dev); + + /* + * Since all of the "noirq" callbacks are executed sequentially, it is + * guaranteed that this function will never run twice in parallel for + * the same PM domain, so it is not necessary to use locking here. + */ + genpd->suspended_count++; + pm_genpd_sync_poweroff(genpd); + + return 0; +} + +/** + * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain. + * @dev: Device to resume. + * + * Carry out an early restore of a device under the assumption that its + * pm_domain field points to the domain member of an object of type + * struct generic_pm_domain representing a power domain consisting of I/O + * devices. + */ +static int pm_genpd_restore_noirq(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + /* + * Since all of the "noirq" callbacks are executed sequentially, it is + * guaranteed that this function will never run twice in parallel for + * the same PM domain, so it is not necessary to use locking here. + */ + genpd->status = GPD_STATE_POWER_OFF; + if (genpd->suspend_power_off) { + /* + * The boot kernel might put the domain into the power on state, + * so make sure it really is powered off. + */ + if (genpd->power_off) + genpd->power_off(genpd); + return 0; + } + + pm_genpd_poweron(genpd); + genpd->suspended_count--; + if (genpd->start_device) + genpd->start_device(dev); + + return pm_generic_restore_noirq(dev); +} + +/** + * pm_genpd_restore - Restore a device belonging to an I/O power domain. + * @dev: Device to resume. + * + * Restore a device under the assumption that its pm_domain field points to the + * domain member of an object of type struct generic_pm_domain representing + * a power domain consisting of I/O devices. + */ +static int pm_genpd_restore(struct device *dev) +{ + struct generic_pm_domain *genpd; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return -EINVAL; + + return genpd->suspend_power_off ? 0 : pm_generic_restore(dev); +} + +/** + * pm_genpd_complete - Complete power transition of a device in a power domain. + * @dev: Device to complete the transition of. + * + * Complete a power transition of a device (during a system-wide power + * transition) under the assumption that its pm_domain field points to the + * domain member of an object of type struct generic_pm_domain representing + * a power domain consisting of I/O devices. + */ +static void pm_genpd_complete(struct device *dev) +{ + struct generic_pm_domain *genpd; + bool run_complete; + + dev_dbg(dev, "%s()\n", __func__); + + genpd = dev_to_genpd(dev); + if (IS_ERR(genpd)) + return; + + mutex_lock(&genpd->lock); + + run_complete = !genpd->suspend_power_off; + if (--genpd->prepared_count == 0) + genpd->suspend_power_off = false; + + mutex_unlock(&genpd->lock); + + if (run_complete) { + pm_generic_complete(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + pm_runtime_idle(dev); + } +} + +#else + +#define pm_genpd_prepare NULL +#define pm_genpd_suspend NULL +#define pm_genpd_suspend_noirq NULL +#define pm_genpd_resume_noirq NULL +#define pm_genpd_resume NULL +#define pm_genpd_freeze NULL +#define pm_genpd_freeze_noirq NULL +#define pm_genpd_thaw_noirq NULL +#define pm_genpd_thaw NULL +#define pm_genpd_dev_poweroff_noirq NULL +#define pm_genpd_dev_poweroff NULL +#define pm_genpd_restore_noirq NULL +#define pm_genpd_restore NULL +#define pm_genpd_complete NULL + +#endif /* CONFIG_PM_SLEEP */ + +/** + * pm_genpd_add_device - Add a device to an I/O PM domain. + * @genpd: PM domain to add the device to. + * @dev: Device to be added. + */ +int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) +{ + struct dev_list_entry *dle; + int ret = 0; + + dev_dbg(dev, "%s()\n", __func__); + + if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) + return -EINVAL; + + genpd_acquire_lock(genpd); + + if (genpd->status == GPD_STATE_POWER_OFF) { + ret = -EINVAL; + goto out; + } + + if (genpd->prepared_count > 0) { + ret = -EAGAIN; + goto out; + } + + list_for_each_entry(dle, &genpd->dev_list, node) + if (dle->dev == dev) { + ret = -EINVAL; + goto out; + } + + dle = kzalloc(sizeof(*dle), GFP_KERNEL); + if (!dle) { + ret = -ENOMEM; + goto out; + } + + dle->dev = dev; + dle->need_restore = false; + list_add_tail(&dle->node, &genpd->dev_list); + genpd->device_count++; + + spin_lock_irq(&dev->power.lock); + dev->pm_domain = &genpd->domain; + spin_unlock_irq(&dev->power.lock); + + out: + genpd_release_lock(genpd); + + return ret; +} + +/** + * pm_genpd_remove_device - Remove a device from an I/O PM domain. + * @genpd: PM domain to remove the device from. + * @dev: Device to be removed. + */ +int pm_genpd_remove_device(struct generic_pm_domain *genpd, + struct device *dev) +{ + struct dev_list_entry *dle; + int ret = -EINVAL; + + dev_dbg(dev, "%s()\n", __func__); + + if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) + return -EINVAL; + + genpd_acquire_lock(genpd); + + if (genpd->prepared_count > 0) { + ret = -EAGAIN; + goto out; + } + + list_for_each_entry(dle, &genpd->dev_list, node) { + if (dle->dev != dev) + continue; + + spin_lock_irq(&dev->power.lock); + dev->pm_domain = NULL; + spin_unlock_irq(&dev->power.lock); + + genpd->device_count--; + list_del(&dle->node); + kfree(dle); + + ret = 0; + break; + } + + out: + genpd_release_lock(genpd); + + return ret; +} + +/** + * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. + * @genpd: Master PM domain to add the subdomain to. + * @new_subdomain: Subdomain to be added. + */ +int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, + struct generic_pm_domain *new_subdomain) +{ + struct generic_pm_domain *subdomain; + int ret = 0; + + if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain)) + return -EINVAL; + + start: + genpd_acquire_lock(genpd); + mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING); + + if (new_subdomain->status != GPD_STATE_POWER_OFF + && new_subdomain->status != GPD_STATE_ACTIVE) { + mutex_unlock(&new_subdomain->lock); + genpd_release_lock(genpd); + goto start; + } + + if (genpd->status == GPD_STATE_POWER_OFF + && new_subdomain->status != GPD_STATE_POWER_OFF) { + ret = -EINVAL; + goto out; + } + + list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { + if (subdomain == new_subdomain) { + ret = -EINVAL; + goto out; + } + } + + list_add_tail(&new_subdomain->sd_node, &genpd->sd_list); + new_subdomain->parent = genpd; + if (subdomain->status != GPD_STATE_POWER_OFF) + genpd->sd_count++; + + out: + mutex_unlock(&new_subdomain->lock); + genpd_release_lock(genpd); + + return ret; +} + +/** + * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. + * @genpd: Master PM domain to remove the subdomain from. + * @target: Subdomain to be removed. + */ +int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, + struct generic_pm_domain *target) +{ + struct generic_pm_domain *subdomain; + int ret = -EINVAL; + + if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target)) + return -EINVAL; + + start: + genpd_acquire_lock(genpd); + + list_for_each_entry(subdomain, &genpd->sd_list, sd_node) { + if (subdomain != target) + continue; + + mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); + + if (subdomain->status != GPD_STATE_POWER_OFF + && subdomain->status != GPD_STATE_ACTIVE) { + mutex_unlock(&subdomain->lock); + genpd_release_lock(genpd); + goto start; + } + + list_del(&subdomain->sd_node); + subdomain->parent = NULL; + if (subdomain->status != GPD_STATE_POWER_OFF) + genpd_sd_counter_dec(genpd); + + mutex_unlock(&subdomain->lock); + + ret = 0; + break; + } + + genpd_release_lock(genpd); + + return ret; +} + +/** + * pm_genpd_init - Initialize a generic I/O PM domain object. + * @genpd: PM domain object to initialize. + * @gov: PM domain governor to associate with the domain (may be NULL). + * @is_off: Initial value of the domain's power_is_off field. + */ +void pm_genpd_init(struct generic_pm_domain *genpd, + struct dev_power_governor *gov, bool is_off) +{ + if (IS_ERR_OR_NULL(genpd)) + return; + + INIT_LIST_HEAD(&genpd->sd_node); + genpd->parent = NULL; + INIT_LIST_HEAD(&genpd->dev_list); + INIT_LIST_HEAD(&genpd->sd_list); + mutex_init(&genpd->lock); + genpd->gov = gov; + INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); + genpd->in_progress = 0; + genpd->sd_count = 0; + genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; + init_waitqueue_head(&genpd->status_wait_queue); + genpd->poweroff_task = NULL; + genpd->resume_count = 0; + genpd->device_count = 0; + genpd->suspended_count = 0; + genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; + genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; + genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; + genpd->domain.ops.prepare = pm_genpd_prepare; + genpd->domain.ops.suspend = pm_genpd_suspend; + genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; + genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; + genpd->domain.ops.resume = pm_genpd_resume; + genpd->domain.ops.freeze = pm_genpd_freeze; + genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; + genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; + genpd->domain.ops.thaw = pm_genpd_thaw; + genpd->domain.ops.poweroff = pm_genpd_dev_poweroff; + genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq; + genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; + genpd->domain.ops.restore = pm_genpd_restore; + genpd->domain.ops.complete = pm_genpd_complete; + mutex_lock(&gpd_list_lock); + list_add(&genpd->gpd_list_node, &gpd_list); + mutex_unlock(&gpd_list_lock); +} diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c index cb3bb368681c..9508df71274b 100644 --- a/drivers/base/power/generic_ops.c +++ b/drivers/base/power/generic_ops.c @@ -94,12 +94,13 @@ int pm_generic_prepare(struct device *dev) * __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback. * @dev: Device to handle. * @event: PM transition of the system under way. + * @bool: Whether or not this is the "noirq" stage. * * If the device has not been suspended at run time, execute the * suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and * return its error code. Otherwise, return zero. */ -static int __pm_generic_call(struct device *dev, int event) +static int __pm_generic_call(struct device *dev, int event, bool noirq) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int (*callback)(struct device *); @@ -109,16 +110,16 @@ static int __pm_generic_call(struct device *dev, int event) switch (event) { case PM_EVENT_SUSPEND: - callback = pm->suspend; + callback = noirq ? pm->suspend_noirq : pm->suspend; break; case PM_EVENT_FREEZE: - callback = pm->freeze; + callback = noirq ? pm->freeze_noirq : pm->freeze; break; case PM_EVENT_HIBERNATE: - callback = pm->poweroff; + callback = noirq ? pm->poweroff_noirq : pm->poweroff; break; case PM_EVENT_THAW: - callback = pm->thaw; + callback = noirq ? pm->thaw_noirq : pm->thaw; break; default: callback = NULL; @@ -129,42 +130,82 @@ static int __pm_generic_call(struct device *dev, int event) } /** + * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems. + * @dev: Device to suspend. + */ +int pm_generic_suspend_noirq(struct device *dev) +{ + return __pm_generic_call(dev, PM_EVENT_SUSPEND, true); +} +EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq); + +/** * pm_generic_suspend - Generic suspend callback for subsystems. * @dev: Device to suspend. */ int pm_generic_suspend(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_SUSPEND); + return __pm_generic_call(dev, PM_EVENT_SUSPEND, false); } EXPORT_SYMBOL_GPL(pm_generic_suspend); /** + * pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems. + * @dev: Device to freeze. + */ +int pm_generic_freeze_noirq(struct device *dev) +{ + return __pm_generic_call(dev, PM_EVENT_FREEZE, true); +} +EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq); + +/** * pm_generic_freeze - Generic freeze callback for subsystems. * @dev: Device to freeze. */ int pm_generic_freeze(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_FREEZE); + return __pm_generic_call(dev, PM_EVENT_FREEZE, false); } EXPORT_SYMBOL_GPL(pm_generic_freeze); /** + * pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems. + * @dev: Device to handle. + */ +int pm_generic_poweroff_noirq(struct device *dev) +{ + return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true); +} +EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq); + +/** * pm_generic_poweroff - Generic poweroff callback for subsystems. * @dev: Device to handle. */ int pm_generic_poweroff(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_HIBERNATE); + return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false); } EXPORT_SYMBOL_GPL(pm_generic_poweroff); /** + * pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems. + * @dev: Device to thaw. + */ +int pm_generic_thaw_noirq(struct device *dev) +{ + return __pm_generic_call(dev, PM_EVENT_THAW, true); +} +EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq); + +/** * pm_generic_thaw - Generic thaw callback for subsystems. * @dev: Device to thaw. */ int pm_generic_thaw(struct device *dev) { - return __pm_generic_call(dev, PM_EVENT_THAW); + return __pm_generic_call(dev, PM_EVENT_THAW, false); } EXPORT_SYMBOL_GPL(pm_generic_thaw); @@ -172,12 +213,13 @@ EXPORT_SYMBOL_GPL(pm_generic_thaw); * __pm_generic_resume - Generic resume/restore callback for subsystems. * @dev: Device to handle. * @event: PM transition of the system under way. + * @bool: Whether or not this is the "noirq" stage. * * Execute the resume/resotre callback provided by the @dev's driver, if * defined. If it returns 0, change the device's runtime PM status to 'active'. * Return the callback's error code. */ -static int __pm_generic_resume(struct device *dev, int event) +static int __pm_generic_resume(struct device *dev, int event, bool noirq) { const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int (*callback)(struct device *); @@ -188,10 +230,10 @@ static int __pm_generic_resume(struct device *dev, int event) switch (event) { case PM_EVENT_RESUME: - callback = pm->resume; + callback = noirq ? pm->resume_noirq : pm->resume; break; case PM_EVENT_RESTORE: - callback = pm->restore; + callback = noirq ? pm->restore_noirq : pm->restore; break; default: callback = NULL; @@ -202,7 +244,7 @@ static int __pm_generic_resume(struct device *dev, int event) return 0; ret = callback(dev); - if (!ret && pm_runtime_enabled(dev)) { + if (!ret && !noirq && pm_runtime_enabled(dev)) { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); @@ -212,22 +254,42 @@ static int __pm_generic_resume(struct device *dev, int event) } /** + * pm_generic_resume_noirq - Generic resume_noirq callback for subsystems. + * @dev: Device to resume. + */ +int pm_generic_resume_noirq(struct device *dev) +{ + return __pm_generic_resume(dev, PM_EVENT_RESUME, true); +} +EXPORT_SYMBOL_GPL(pm_generic_resume_noirq); + +/** * pm_generic_resume - Generic resume callback for subsystems. * @dev: Device to resume. */ int pm_generic_resume(struct device *dev) { - return __pm_generic_resume(dev, PM_EVENT_RESUME); + return __pm_generic_resume(dev, PM_EVENT_RESUME, false); } EXPORT_SYMBOL_GPL(pm_generic_resume); /** + * pm_generic_restore_noirq - Generic restore_noirq callback for subsystems. + * @dev: Device to restore. + */ +int pm_generic_restore_noirq(struct device *dev) +{ + return __pm_generic_resume(dev, PM_EVENT_RESTORE, true); +} +EXPORT_SYMBOL_GPL(pm_generic_restore_noirq); + +/** * pm_generic_restore - Generic restore callback for subsystems. * @dev: Device to restore. */ int pm_generic_restore(struct device *dev) { - return __pm_generic_resume(dev, PM_EVENT_RESTORE); + return __pm_generic_resume(dev, PM_EVENT_RESTORE, false); } EXPORT_SYMBOL_GPL(pm_generic_restore); @@ -256,11 +318,17 @@ struct dev_pm_ops generic_subsys_pm_ops = { #ifdef CONFIG_PM_SLEEP .prepare = pm_generic_prepare, .suspend = pm_generic_suspend, + .suspend_noirq = pm_generic_suspend_noirq, .resume = pm_generic_resume, + .resume_noirq = pm_generic_resume_noirq, .freeze = pm_generic_freeze, + .freeze_noirq = pm_generic_freeze_noirq, .thaw = pm_generic_thaw, + .thaw_noirq = pm_generic_thaw_noirq, .poweroff = pm_generic_poweroff, + .poweroff_noirq = pm_generic_poweroff_noirq, .restore = pm_generic_restore, + .restore_noirq = pm_generic_restore_noirq, .complete = pm_generic_complete, #endif #ifdef CONFIG_PM_RUNTIME diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index aa6320207745..a85459126bc6 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -57,7 +57,8 @@ static int async_error; */ void device_pm_init(struct device *dev) { - dev->power.in_suspend = false; + dev->power.is_prepared = false; + dev->power.is_suspended = false; init_completion(&dev->power.completion); complete_all(&dev->power.completion); dev->power.wakeup = NULL; @@ -91,7 +92,7 @@ void device_pm_add(struct device *dev) pr_debug("PM: Adding info for %s:%s\n", dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); mutex_lock(&dpm_list_mtx); - if (dev->parent && dev->parent->power.in_suspend) + if (dev->parent && dev->parent->power.is_prepared) dev_warn(dev, "parent %s should not be sleeping\n", dev_name(dev->parent)); list_add_tail(&dev->power.entry, &dpm_list); @@ -424,9 +425,9 @@ static int device_resume_noirq(struct device *dev, pm_message_t state) TRACE_DEVICE(dev); TRACE_RESUME(0); - if (dev->pwr_domain) { + if (dev->pm_domain) { pm_dev_dbg(dev, state, "EARLY power domain "); - error = pm_noirq_op(dev, &dev->pwr_domain->ops, state); + error = pm_noirq_op(dev, &dev->pm_domain->ops, state); } else if (dev->type && dev->type->pm) { pm_dev_dbg(dev, state, "EARLY type "); error = pm_noirq_op(dev, dev->type->pm, state); @@ -504,6 +505,7 @@ static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) static int device_resume(struct device *dev, pm_message_t state, bool async) { int error = 0; + bool put = false; TRACE_DEVICE(dev); TRACE_RESUME(0); @@ -511,11 +513,21 @@ static int device_resume(struct device *dev, pm_message_t state, bool async) dpm_wait(dev->parent, async); device_lock(dev); - dev->power.in_suspend = false; + /* + * This is a fib. But we'll allow new children to be added below + * a resumed device, even if the device hasn't been completed yet. + */ + dev->power.is_prepared = false; - if (dev->pwr_domain) { + if (!dev->power.is_suspended) + goto Unlock; + + pm_runtime_enable(dev); + put = true; + + if (dev->pm_domain) { pm_dev_dbg(dev, state, "power domain "); - error = pm_op(dev, &dev->pwr_domain->ops, state); + error = pm_op(dev, &dev->pm_domain->ops, state); goto End; } @@ -548,10 +560,17 @@ static int device_resume(struct device *dev, pm_message_t state, bool async) } End: + dev->power.is_suspended = false; + + Unlock: device_unlock(dev); complete_all(&dev->power.completion); TRACE_RESUME(error); + + if (put) + pm_runtime_put_sync(dev); + return error; } @@ -630,10 +649,10 @@ static void device_complete(struct device *dev, pm_message_t state) { device_lock(dev); - if (dev->pwr_domain) { + if (dev->pm_domain) { pm_dev_dbg(dev, state, "completing power domain "); - if (dev->pwr_domain->ops.complete) - dev->pwr_domain->ops.complete(dev); + if (dev->pm_domain->ops.complete) + dev->pm_domain->ops.complete(dev); } else if (dev->type && dev->type->pm) { pm_dev_dbg(dev, state, "completing type "); if (dev->type->pm->complete) @@ -670,7 +689,7 @@ void dpm_complete(pm_message_t state) struct device *dev = to_device(dpm_prepared_list.prev); get_device(dev); - dev->power.in_suspend = false; + dev->power.is_prepared = false; list_move(&dev->power.entry, &list); mutex_unlock(&dpm_list_mtx); @@ -733,9 +752,9 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state) { int error; - if (dev->pwr_domain) { + if (dev->pm_domain) { pm_dev_dbg(dev, state, "LATE power domain "); - error = pm_noirq_op(dev, &dev->pwr_domain->ops, state); + error = pm_noirq_op(dev, &dev->pm_domain->ops, state); if (error) return error; } else if (dev->type && dev->type->pm) { @@ -832,19 +851,25 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) int error = 0; dpm_wait_for_children(dev, async); - device_lock(dev); if (async_error) - goto End; + return 0; + + pm_runtime_get_noresume(dev); + if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) + pm_wakeup_event(dev, 0); if (pm_wakeup_pending()) { + pm_runtime_put_sync(dev); async_error = -EBUSY; - goto End; + return 0; } - if (dev->pwr_domain) { + device_lock(dev); + + if (dev->pm_domain) { pm_dev_dbg(dev, state, "power domain "); - error = pm_op(dev, &dev->pwr_domain->ops, state); + error = pm_op(dev, &dev->pm_domain->ops, state); goto End; } @@ -877,11 +902,17 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async) } End: + dev->power.is_suspended = !error; + device_unlock(dev); complete_all(&dev->power.completion); - if (error) + if (error) { + pm_runtime_put_sync(dev); async_error = error; + } else if (dev->power.is_suspended) { + __pm_runtime_disable(dev, false); + } return error; } @@ -968,11 +999,11 @@ static int device_prepare(struct device *dev, pm_message_t state) device_lock(dev); - if (dev->pwr_domain) { + if (dev->pm_domain) { pm_dev_dbg(dev, state, "preparing power domain "); - if (dev->pwr_domain->ops.prepare) - error = dev->pwr_domain->ops.prepare(dev); - suspend_report_result(dev->pwr_domain->ops.prepare, error); + if (dev->pm_domain->ops.prepare) + error = dev->pm_domain->ops.prepare(dev); + suspend_report_result(dev->pm_domain->ops.prepare, error); if (error) goto End; } else if (dev->type && dev->type->pm) { @@ -1021,13 +1052,7 @@ int dpm_prepare(pm_message_t state) get_device(dev); mutex_unlock(&dpm_list_mtx); - pm_runtime_get_noresume(dev); - if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) - pm_wakeup_event(dev, 0); - - pm_runtime_put_sync(dev); - error = pm_wakeup_pending() ? - -EBUSY : device_prepare(dev, state); + error = device_prepare(dev, state); mutex_lock(&dpm_list_mtx); if (error) { @@ -1042,7 +1067,7 @@ int dpm_prepare(pm_message_t state) put_device(dev); break; } - dev->power.in_suspend = true; + dev->power.is_prepared = true; if (!list_empty(&dev->power.entry)) list_move_tail(&dev->power.entry, &dpm_prepared_list); put_device(dev); diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c index 56a6899f5e9e..b23de185cb04 100644 --- a/drivers/base/power/opp.c +++ b/drivers/base/power/opp.c @@ -453,7 +453,7 @@ int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) static int opp_set_availability(struct device *dev, unsigned long freq, bool availability_req) { - struct device_opp *tmp_dev_opp, *dev_opp = NULL; + struct device_opp *tmp_dev_opp, *dev_opp = ERR_PTR(-ENODEV); struct opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV); int r = 0; @@ -625,4 +625,21 @@ int opp_init_cpufreq_table(struct device *dev, return 0; } + +/** + * opp_free_cpufreq_table() - free the cpufreq table + * @dev: device for which we do this operation + * @table: table to free + * + * Free up the table allocated by opp_init_cpufreq_table + */ +void opp_free_cpufreq_table(struct device *dev, + struct cpufreq_frequency_table **table) +{ + if (!table) + return; + + kfree(*table); + *table = NULL; +} #endif /* CONFIG_CPU_FREQ */ diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 0d4587b15c55..acb3f83b8079 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1,5 +1,5 @@ /* - * drivers/base/power/runtime.c - Helper functions for device run-time PM + * drivers/base/power/runtime.c - Helper functions for device runtime PM * * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. * Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu> @@ -135,8 +135,9 @@ static int rpm_check_suspend_allowed(struct device *dev) if (dev->power.runtime_error) retval = -EINVAL; - else if (atomic_read(&dev->power.usage_count) > 0 - || dev->power.disable_depth > 0) + else if (dev->power.disable_depth > 0) + retval = -EACCES; + else if (atomic_read(&dev->power.usage_count) > 0) retval = -EAGAIN; else if (!pm_children_suspended(dev)) retval = -EBUSY; @@ -158,7 +159,7 @@ static int rpm_check_suspend_allowed(struct device *dev) * @dev: Device to notify the bus type about. * @rpmflags: Flag bits. * - * Check if the device's run-time PM status allows it to be suspended. If + * Check if the device's runtime PM status allows it to be suspended. If * another idle notification has been started earlier, return immediately. If * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise * run the ->runtime_idle() callback directly. @@ -213,8 +214,8 @@ static int rpm_idle(struct device *dev, int rpmflags) dev->power.idle_notification = true; - if (dev->pwr_domain) - callback = dev->pwr_domain->ops.runtime_idle; + if (dev->pm_domain) + callback = dev->pm_domain->ops.runtime_idle; else if (dev->type && dev->type->pm) callback = dev->type->pm->runtime_idle; else if (dev->class && dev->class->pm) @@ -225,11 +226,17 @@ static int rpm_idle(struct device *dev, int rpmflags) callback = NULL; if (callback) { - spin_unlock_irq(&dev->power.lock); + if (dev->power.irq_safe) + spin_unlock(&dev->power.lock); + else + spin_unlock_irq(&dev->power.lock); callback(dev); - spin_lock_irq(&dev->power.lock); + if (dev->power.irq_safe) + spin_lock(&dev->power.lock); + else + spin_lock_irq(&dev->power.lock); } dev->power.idle_notification = false; @@ -262,15 +269,15 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev) spin_lock_irq(&dev->power.lock); } dev->power.runtime_error = retval; - return retval; + return retval != -EACCES ? retval : -EIO; } /** - * rpm_suspend - Carry out run-time suspend of given device. + * rpm_suspend - Carry out runtime suspend of given device. * @dev: Device to suspend. * @rpmflags: Flag bits. * - * Check if the device's run-time PM status allows it to be suspended. If + * Check if the device's runtime PM status allows it to be suspended. If * another suspend has been started earlier, either return immediately or wait * for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags. Cancel a * pending idle notification. If the RPM_ASYNC flag is set then queue a @@ -374,8 +381,8 @@ static int rpm_suspend(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_SUSPENDING); - if (dev->pwr_domain) - callback = dev->pwr_domain->ops.runtime_suspend; + if (dev->pm_domain) + callback = dev->pm_domain->ops.runtime_suspend; else if (dev->type && dev->type->pm) callback = dev->type->pm->runtime_suspend; else if (dev->class && dev->class->pm) @@ -388,7 +395,7 @@ static int rpm_suspend(struct device *dev, int rpmflags) retval = rpm_callback(callback, dev); if (retval) { __update_runtime_status(dev, RPM_ACTIVE); - dev->power.deferred_resume = 0; + dev->power.deferred_resume = false; if (retval == -EAGAIN || retval == -EBUSY) dev->power.runtime_error = 0; else @@ -429,11 +436,11 @@ static int rpm_suspend(struct device *dev, int rpmflags) } /** - * rpm_resume - Carry out run-time resume of given device. + * rpm_resume - Carry out runtime resume of given device. * @dev: Device to resume. * @rpmflags: Flag bits. * - * Check if the device's run-time PM status allows it to be resumed. Cancel + * Check if the device's runtime PM status allows it to be resumed. Cancel * any scheduled or pending requests. If another resume has been started * earlier, either return immediately or wait for it to finish, depending on the * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in @@ -458,7 +465,7 @@ static int rpm_resume(struct device *dev, int rpmflags) if (dev->power.runtime_error) retval = -EINVAL; else if (dev->power.disable_depth > 0) - retval = -EAGAIN; + retval = -EACCES; if (retval) goto out; @@ -550,7 +557,7 @@ static int rpm_resume(struct device *dev, int rpmflags) spin_lock(&parent->power.lock); /* - * We can resume if the parent's run-time PM is disabled or it + * We can resume if the parent's runtime PM is disabled or it * is set to ignore children. */ if (!parent->power.disable_depth @@ -573,8 +580,8 @@ static int rpm_resume(struct device *dev, int rpmflags) __update_runtime_status(dev, RPM_RESUMING); - if (dev->pwr_domain) - callback = dev->pwr_domain->ops.runtime_resume; + if (dev->pm_domain) + callback = dev->pm_domain->ops.runtime_resume; else if (dev->type && dev->type->pm) callback = dev->type->pm->runtime_resume; else if (dev->class && dev->class->pm) @@ -614,11 +621,11 @@ static int rpm_resume(struct device *dev, int rpmflags) } /** - * pm_runtime_work - Universal run-time PM work function. + * pm_runtime_work - Universal runtime PM work function. * @work: Work structure used for scheduling the execution of this function. * * Use @work to get the device object the work is to be done for, determine what - * is to be done and execute the appropriate run-time PM function. + * is to be done and execute the appropriate runtime PM function. */ static void pm_runtime_work(struct work_struct *work) { @@ -717,7 +724,7 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay) EXPORT_SYMBOL_GPL(pm_schedule_suspend); /** - * __pm_runtime_idle - Entry point for run-time idle operations. + * __pm_runtime_idle - Entry point for runtime idle operations. * @dev: Device to send idle notification for. * @rpmflags: Flag bits. * @@ -746,7 +753,7 @@ int __pm_runtime_idle(struct device *dev, int rpmflags) EXPORT_SYMBOL_GPL(__pm_runtime_idle); /** - * __pm_runtime_suspend - Entry point for run-time put/suspend operations. + * __pm_runtime_suspend - Entry point for runtime put/suspend operations. * @dev: Device to suspend. * @rpmflags: Flag bits. * @@ -775,7 +782,7 @@ int __pm_runtime_suspend(struct device *dev, int rpmflags) EXPORT_SYMBOL_GPL(__pm_runtime_suspend); /** - * __pm_runtime_resume - Entry point for run-time resume operations. + * __pm_runtime_resume - Entry point for runtime resume operations. * @dev: Device to resume. * @rpmflags: Flag bits. * @@ -801,11 +808,11 @@ int __pm_runtime_resume(struct device *dev, int rpmflags) EXPORT_SYMBOL_GPL(__pm_runtime_resume); /** - * __pm_runtime_set_status - Set run-time PM status of a device. + * __pm_runtime_set_status - Set runtime PM status of a device. * @dev: Device to handle. - * @status: New run-time PM status of the device. + * @status: New runtime PM status of the device. * - * If run-time PM of the device is disabled or its power.runtime_error field is + * If runtime PM of the device is disabled or its power.runtime_error field is * different from zero, the status may be changed either to RPM_ACTIVE, or to * RPM_SUSPENDED, as long as that reflects the actual state of the device. * However, if the device has a parent and the parent is not active, and the @@ -851,7 +858,7 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status) /* * It is invalid to put an active child under a parent that is - * not active, has run-time PM enabled and the + * not active, has runtime PM enabled and the * 'power.ignore_children' flag unset. */ if (!parent->power.disable_depth @@ -885,7 +892,7 @@ EXPORT_SYMBOL_GPL(__pm_runtime_set_status); * @dev: Device to handle. * * Flush all pending requests for the device from pm_wq and wait for all - * run-time PM operations involving the device in progress to complete. + * runtime PM operations involving the device in progress to complete. * * Should be called under dev->power.lock with interrupts disabled. */ @@ -933,7 +940,7 @@ static void __pm_runtime_barrier(struct device *dev) * Prevent the device from being suspended by incrementing its usage counter and * if there's a pending resume request for the device, wake the device up. * Next, make sure that all pending requests for the device have been flushed - * from pm_wq and wait for all run-time PM operations involving the device in + * from pm_wq and wait for all runtime PM operations involving the device in * progress to complete. * * Return value: @@ -963,18 +970,18 @@ int pm_runtime_barrier(struct device *dev) EXPORT_SYMBOL_GPL(pm_runtime_barrier); /** - * __pm_runtime_disable - Disable run-time PM of a device. + * __pm_runtime_disable - Disable runtime PM of a device. * @dev: Device to handle. * @check_resume: If set, check if there's a resume request for the device. * * Increment power.disable_depth for the device and if was zero previously, - * cancel all pending run-time PM requests for the device and wait for all + * cancel all pending runtime PM requests for the device and wait for all * operations in progress to complete. The device can be either active or - * suspended after its run-time PM has been disabled. + * suspended after its runtime PM has been disabled. * * If @check_resume is set and there's a resume request pending when * __pm_runtime_disable() is called and power.disable_depth is zero, the - * function will wake up the device before disabling its run-time PM. + * function will wake up the device before disabling its runtime PM. */ void __pm_runtime_disable(struct device *dev, bool check_resume) { @@ -987,7 +994,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume) /* * Wake up the device if there's a resume request pending, because that - * means there probably is some I/O to process and disabling run-time PM + * means there probably is some I/O to process and disabling runtime PM * shouldn't prevent the device from processing the I/O. */ if (check_resume && dev->power.request_pending @@ -1012,7 +1019,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume) EXPORT_SYMBOL_GPL(__pm_runtime_disable); /** - * pm_runtime_enable - Enable run-time PM of a device. + * pm_runtime_enable - Enable runtime PM of a device. * @dev: Device to handle. */ void pm_runtime_enable(struct device *dev) @@ -1031,7 +1038,7 @@ void pm_runtime_enable(struct device *dev) EXPORT_SYMBOL_GPL(pm_runtime_enable); /** - * pm_runtime_forbid - Block run-time PM of a device. + * pm_runtime_forbid - Block runtime PM of a device. * @dev: Device to handle. * * Increase the device's usage count and clear its power.runtime_auto flag, @@ -1054,7 +1061,7 @@ void pm_runtime_forbid(struct device *dev) EXPORT_SYMBOL_GPL(pm_runtime_forbid); /** - * pm_runtime_allow - Unblock run-time PM of a device. + * pm_runtime_allow - Unblock runtime PM of a device. * @dev: Device to handle. * * Decrease the device's usage count and set its power.runtime_auto flag. @@ -1075,12 +1082,12 @@ void pm_runtime_allow(struct device *dev) EXPORT_SYMBOL_GPL(pm_runtime_allow); /** - * pm_runtime_no_callbacks - Ignore run-time PM callbacks for a device. + * pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device. * @dev: Device to handle. * * Set the power.no_callbacks flag, which tells the PM core that this - * device is power-managed through its parent and has no run-time PM - * callbacks of its own. The run-time sysfs attributes will be removed. + * device is power-managed through its parent and has no runtime PM + * callbacks of its own. The runtime sysfs attributes will be removed. */ void pm_runtime_no_callbacks(struct device *dev) { @@ -1156,8 +1163,8 @@ static void update_autosuspend(struct device *dev, int old_delay, int old_use) * @delay: Value of the new delay in milliseconds. * * Set the device's power.autosuspend_delay value. If it changes to negative - * and the power.use_autosuspend flag is set, prevent run-time suspends. If it - * changes the other way, allow run-time suspends. + * and the power.use_autosuspend flag is set, prevent runtime suspends. If it + * changes the other way, allow runtime suspends. */ void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) { @@ -1177,7 +1184,7 @@ EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); * @dev: Device to handle. * @use: New value for use_autosuspend. * - * Set the device's power.use_autosuspend flag, and allow or prevent run-time + * Set the device's power.use_autosuspend flag, and allow or prevent runtime * suspends as needed. */ void __pm_runtime_use_autosuspend(struct device *dev, bool use) @@ -1194,7 +1201,7 @@ void __pm_runtime_use_autosuspend(struct device *dev, bool use) EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); /** - * pm_runtime_init - Initialize run-time PM fields in given device object. + * pm_runtime_init - Initialize runtime PM fields in given device object. * @dev: Device object to initialize. */ void pm_runtime_init(struct device *dev) diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c index a9f5b8979611..17b7934f31cb 100644 --- a/drivers/base/power/sysfs.c +++ b/drivers/base/power/sysfs.c @@ -5,7 +5,7 @@ #include <linux/device.h> #include <linux/string.h> #include <linux/pm_runtime.h> -#include <asm/atomic.h> +#include <linux/atomic.h> #include <linux/jiffies.h> #include "power.h" @@ -116,12 +116,14 @@ static ssize_t control_store(struct device * dev, struct device_attribute *attr, cp = memchr(buf, '\n', n); if (cp) len = cp - buf; + device_lock(dev); if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0) pm_runtime_allow(dev); else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0) pm_runtime_forbid(dev); else - return -EINVAL; + n = -EINVAL; + device_unlock(dev); return n; } @@ -205,7 +207,9 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev, if (strict_strtol(buf, 10, &delay) != 0 || delay != (int) delay) return -EINVAL; + device_lock(dev); pm_runtime_set_autosuspend_delay(dev, delay); + device_unlock(dev); return n; } diff --git a/drivers/base/power/trace.c b/drivers/base/power/trace.c index c80e138b62fe..af10abecb99b 100644 --- a/drivers/base/power/trace.c +++ b/drivers/base/power/trace.c @@ -112,7 +112,7 @@ static unsigned int read_magic_time(void) unsigned int val; get_rtc_time(&time); - pr_info("Time: %2d:%02d:%02d Date: %02d/%02d/%02d\n", + pr_info("RTC time: %2d:%02d:%02d, date: %02d/%02d/%02d\n", time.tm_hour, time.tm_min, time.tm_sec, time.tm_mon + 1, time.tm_mday, time.tm_year % 100); val = time.tm_year; /* 100 years */ diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig new file mode 100644 index 000000000000..fabbf6cc5367 --- /dev/null +++ b/drivers/base/regmap/Kconfig @@ -0,0 +1,13 @@ +# Generic register map support. There are no user servicable options here, +# this is an API intended to be used by other kernel subsystems. These +# subsystems should select the appropriate symbols. + +config REGMAP + default y if (REGMAP_I2C || REGMAP_SPI) + bool + +config REGMAP_I2C + tristate + +config REGMAP_SPI + tristate diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile new file mode 100644 index 000000000000..f476f4571295 --- /dev/null +++ b/drivers/base/regmap/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_REGMAP) += regmap.o +obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o +obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o diff --git a/drivers/base/regmap/regmap-i2c.c b/drivers/base/regmap/regmap-i2c.c new file mode 100644 index 000000000000..c4f7a45cd2c3 --- /dev/null +++ b/drivers/base/regmap/regmap-i2c.c @@ -0,0 +1,116 @@ +/* + * Register map access API - I2C support + * + * Copyright 2011 Wolfson Microelectronics plc + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/regmap.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/init.h> + +static int regmap_i2c_write(struct device *dev, const void *data, size_t count) +{ + struct i2c_client *i2c = to_i2c_client(dev); + int ret; + + ret = i2c_master_send(i2c, data, count); + if (ret == count) + return 0; + else if (ret < 0) + return ret; + else + return -EIO; +} + +static int regmap_i2c_gather_write(struct device *dev, + const void *reg, size_t reg_size, + const void *val, size_t val_size) +{ + struct i2c_client *i2c = to_i2c_client(dev); + struct i2c_msg xfer[2]; + int ret; + + /* If the I2C controller can't do a gather tell the core, it + * will substitute in a linear write for us. + */ + if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_PROTOCOL_MANGLING)) + return -ENOTSUPP; + + xfer[0].addr = i2c->addr; + xfer[0].flags = 0; + xfer[0].len = reg_size; + xfer[0].buf = (void *)reg; + + xfer[1].addr = i2c->addr; + xfer[1].flags = I2C_M_NOSTART; + xfer[1].len = val_size; + xfer[1].buf = (void *)val; + + ret = i2c_transfer(i2c->adapter, xfer, 2); + if (ret == 2) + return 0; + if (ret < 0) + return ret; + else + return -EIO; +} + +static int regmap_i2c_read(struct device *dev, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct i2c_client *i2c = to_i2c_client(dev); + struct i2c_msg xfer[2]; + int ret; + + xfer[0].addr = i2c->addr; + xfer[0].flags = 0; + xfer[0].len = reg_size; + xfer[0].buf = (void *)reg; + + xfer[1].addr = i2c->addr; + xfer[1].flags = I2C_M_RD; + xfer[1].len = val_size; + xfer[1].buf = val; + + ret = i2c_transfer(i2c->adapter, xfer, 2); + if (ret == 2) + return 0; + else if (ret < 0) + return ret; + else + return -EIO; +} + +static struct regmap_bus regmap_i2c = { + .type = &i2c_bus_type, + .write = regmap_i2c_write, + .gather_write = regmap_i2c_gather_write, + .read = regmap_i2c_read, + .owner = THIS_MODULE, +}; + +/** + * regmap_init_i2c(): Initialise register map + * + * @i2c: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. + */ +struct regmap *regmap_init_i2c(struct i2c_client *i2c, + const struct regmap_config *config) +{ + return regmap_init(&i2c->dev, ®map_i2c, config); +} +EXPORT_SYMBOL_GPL(regmap_init_i2c); + +MODULE_LICENSE("GPL"); diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c new file mode 100644 index 000000000000..f8396945d6ed --- /dev/null +++ b/drivers/base/regmap/regmap-spi.c @@ -0,0 +1,75 @@ +/* + * Register map access API - SPI support + * + * Copyright 2011 Wolfson Microelectronics plc + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/regmap.h> +#include <linux/spi/spi.h> +#include <linux/init.h> +#include <linux/module.h> + +static int regmap_spi_write(struct device *dev, const void *data, size_t count) +{ + struct spi_device *spi = to_spi_device(dev); + + return spi_write(spi, data, count); +} + +static int regmap_spi_gather_write(struct device *dev, + const void *reg, size_t reg_len, + const void *val, size_t val_len) +{ + struct spi_device *spi = to_spi_device(dev); + struct spi_message m; + struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, }, + { .tx_buf = val, .len = val_len, }, }; + + spi_message_init(&m); + spi_message_add_tail(&t[0], &m); + spi_message_add_tail(&t[1], &m); + + return spi_sync(spi, &m); +} + +static int regmap_spi_read(struct device *dev, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct spi_device *spi = to_spi_device(dev); + + return spi_write_then_read(spi, reg, reg_size, val, val_size); +} + +static struct regmap_bus regmap_spi = { + .type = &spi_bus_type, + .write = regmap_spi_write, + .gather_write = regmap_spi_gather_write, + .read = regmap_spi_read, + .owner = THIS_MODULE, + .read_flag_mask = 0x80, +}; + +/** + * regmap_init_spi(): Initialise register map + * + * @spi: Device that will be interacted with + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. + */ +struct regmap *regmap_init_spi(struct spi_device *spi, + const struct regmap_config *config) +{ + return regmap_init(&spi->dev, ®map_spi, config); +} +EXPORT_SYMBOL_GPL(regmap_init_spi); + +MODULE_LICENSE("GPL"); diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c new file mode 100644 index 000000000000..0eef4da1ac61 --- /dev/null +++ b/drivers/base/regmap/regmap.c @@ -0,0 +1,455 @@ +/* + * Register map access API + * + * Copyright 2011 Wolfson Microelectronics plc + * + * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/err.h> + +#include <linux/regmap.h> + +struct regmap; + +struct regmap_format { + size_t buf_size; + size_t reg_bytes; + size_t val_bytes; + void (*format_write)(struct regmap *map, + unsigned int reg, unsigned int val); + void (*format_reg)(void *buf, unsigned int reg); + void (*format_val)(void *buf, unsigned int val); + unsigned int (*parse_val)(void *buf); +}; + +struct regmap { + struct mutex lock; + + struct device *dev; /* Device we do I/O on */ + void *work_buf; /* Scratch buffer used to format I/O */ + struct regmap_format format; /* Buffer format */ + const struct regmap_bus *bus; +}; + +static void regmap_format_4_12_write(struct regmap *map, + unsigned int reg, unsigned int val) +{ + __be16 *out = map->work_buf; + *out = cpu_to_be16((reg << 12) | val); +} + +static void regmap_format_7_9_write(struct regmap *map, + unsigned int reg, unsigned int val) +{ + __be16 *out = map->work_buf; + *out = cpu_to_be16((reg << 9) | val); +} + +static void regmap_format_8(void *buf, unsigned int val) +{ + u8 *b = buf; + + b[0] = val; +} + +static void regmap_format_16(void *buf, unsigned int val) +{ + __be16 *b = buf; + + b[0] = cpu_to_be16(val); +} + +static unsigned int regmap_parse_8(void *buf) +{ + u8 *b = buf; + + return b[0]; +} + +static unsigned int regmap_parse_16(void *buf) +{ + __be16 *b = buf; + + b[0] = be16_to_cpu(b[0]); + + return b[0]; +} + +/** + * regmap_init(): Initialise register map + * + * @dev: Device that will be interacted with + * @bus: Bus-specific callbacks to use with device + * @config: Configuration for register map + * + * The return value will be an ERR_PTR() on error or a valid pointer to + * a struct regmap. This function should generally not be called + * directly, it should be called by bus-specific init functions. + */ +struct regmap *regmap_init(struct device *dev, + const struct regmap_bus *bus, + const struct regmap_config *config) +{ + struct regmap *map; + int ret = -EINVAL; + + if (!bus || !config) + return NULL; + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (map == NULL) { + ret = -ENOMEM; + goto err; + } + + mutex_init(&map->lock); + map->format.buf_size = (config->reg_bits + config->val_bits) / 8; + map->format.reg_bytes = config->reg_bits / 8; + map->format.val_bytes = config->val_bits / 8; + map->dev = dev; + map->bus = bus; + + switch (config->reg_bits) { + case 4: + switch (config->val_bits) { + case 12: + map->format.format_write = regmap_format_4_12_write; + break; + default: + goto err_map; + } + break; + + case 7: + switch (config->val_bits) { + case 9: + map->format.format_write = regmap_format_7_9_write; + break; + default: + goto err_map; + } + break; + + case 8: + map->format.format_reg = regmap_format_8; + break; + + case 16: + map->format.format_reg = regmap_format_16; + break; + + default: + goto err_map; + } + + switch (config->val_bits) { + case 8: + map->format.format_val = regmap_format_8; + map->format.parse_val = regmap_parse_8; + break; + case 16: + map->format.format_val = regmap_format_16; + map->format.parse_val = regmap_parse_16; + break; + } + + if (!map->format.format_write && + !(map->format.format_reg && map->format.format_val)) + goto err_map; + + map->work_buf = kmalloc(map->format.buf_size, GFP_KERNEL); + if (map->work_buf == NULL) { + ret = -ENOMEM; + goto err_bus; + } + + return map; + +err_bus: + module_put(map->bus->owner); +err_map: + kfree(map); +err: + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(regmap_init); + +/** + * regmap_exit(): Free a previously allocated register map + */ +void regmap_exit(struct regmap *map) +{ + kfree(map->work_buf); + module_put(map->bus->owner); + kfree(map); +} +EXPORT_SYMBOL_GPL(regmap_exit); + +static int _regmap_raw_write(struct regmap *map, unsigned int reg, + const void *val, size_t val_len) +{ + void *buf; + int ret = -ENOTSUPP; + size_t len; + + map->format.format_reg(map->work_buf, reg); + + /* Try to do a gather write if we can */ + if (map->bus->gather_write) + ret = map->bus->gather_write(map->dev, map->work_buf, + map->format.reg_bytes, + val, val_len); + + /* Otherwise fall back on linearising by hand. */ + if (ret == -ENOTSUPP) { + len = map->format.reg_bytes + val_len; + buf = kmalloc(len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + memcpy(buf, map->work_buf, map->format.reg_bytes); + memcpy(buf + map->format.reg_bytes, val, val_len); + ret = map->bus->write(map->dev, buf, len); + + kfree(buf); + } + + return ret; +} + +static int _regmap_write(struct regmap *map, unsigned int reg, + unsigned int val) +{ + BUG_ON(!map->format.format_write && !map->format.format_val); + + if (map->format.format_write) { + map->format.format_write(map, reg, val); + + return map->bus->write(map->dev, map->work_buf, + map->format.buf_size); + } else { + map->format.format_val(map->work_buf + map->format.reg_bytes, + val); + return _regmap_raw_write(map, reg, + map->work_buf + map->format.reg_bytes, + map->format.val_bytes); + } +} + +/** + * regmap_write(): Write a value to a single register + * + * @map: Register map to write to + * @reg: Register to write to + * @val: Value to be written + * + * A value of zero will be returned on success, a negative errno will + * be returned in error cases. + */ +int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) +{ + int ret; + + mutex_lock(&map->lock); + + ret = _regmap_write(map, reg, val); + + mutex_unlock(&map->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(regmap_write); + +/** + * regmap_raw_write(): Write raw values to one or more registers + * + * @map: Register map to write to + * @reg: Initial register to write to + * @val: Block of data to be written, laid out for direct transmission to the + * device + * @val_len: Length of data pointed to by val. + * + * This function is intended to be used for things like firmware + * download where a large block of data needs to be transferred to the + * device. No formatting will be done on the data provided. + * + * A value of zero will be returned on success, a negative errno will + * be returned in error cases. + */ +int regmap_raw_write(struct regmap *map, unsigned int reg, + const void *val, size_t val_len) +{ + int ret; + + mutex_lock(&map->lock); + + ret = _regmap_raw_write(map, reg, val, val_len); + + mutex_unlock(&map->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(regmap_raw_write); + +static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val, + unsigned int val_len) +{ + u8 *u8 = map->work_buf; + int ret; + + map->format.format_reg(map->work_buf, reg); + + /* + * Some buses flag reads by setting the high bits in the + * register addresss; since it's always the high bits for all + * current formats we can do this here rather than in + * formatting. This may break if we get interesting formats. + */ + if (map->bus->read_flag_mask) + u8[0] |= map->bus->read_flag_mask; + + ret = map->bus->read(map->dev, map->work_buf, map->format.reg_bytes, + val, val_len); + if (ret != 0) + return ret; + + return 0; +} + +static int _regmap_read(struct regmap *map, unsigned int reg, + unsigned int *val) +{ + int ret; + + if (!map->format.parse_val) + return -EINVAL; + + ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes); + if (ret == 0) + *val = map->format.parse_val(map->work_buf); + + return ret; +} + +/** + * regmap_read(): Read a value from a single register + * + * @map: Register map to write to + * @reg: Register to be read from + * @val: Pointer to store read value + * + * A value of zero will be returned on success, a negative errno will + * be returned in error cases. + */ +int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) +{ + int ret; + + mutex_lock(&map->lock); + + ret = _regmap_read(map, reg, val); + + mutex_unlock(&map->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(regmap_read); + +/** + * regmap_raw_read(): Read raw data from the device + * + * @map: Register map to write to + * @reg: First register to be read from + * @val: Pointer to store read value + * @val_len: Size of data to read + * + * A value of zero will be returned on success, a negative errno will + * be returned in error cases. + */ +int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, + size_t val_len) +{ + int ret; + + mutex_lock(&map->lock); + + ret = _regmap_raw_read(map, reg, val, val_len); + + mutex_unlock(&map->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(regmap_raw_read); + +/** + * regmap_bulk_read(): Read multiple registers from the device + * + * @map: Register map to write to + * @reg: First register to be read from + * @val: Pointer to store read value, in native register size for device + * @val_count: Number of registers to read + * + * A value of zero will be returned on success, a negative errno will + * be returned in error cases. + */ +int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, + size_t val_count) +{ + int ret, i; + size_t val_bytes = map->format.val_bytes; + + if (!map->format.parse_val) + return -EINVAL; + + ret = regmap_raw_read(map, reg, val, val_bytes * val_count); + if (ret != 0) + return ret; + + for (i = 0; i < val_count * val_bytes; i += val_bytes) + map->format.parse_val(val + i); + + return 0; +} +EXPORT_SYMBOL_GPL(regmap_bulk_read); + +/** + * remap_update_bits: Perform a read/modify/write cycle on the register map + * + * @map: Register map to update + * @reg: Register to update + * @mask: Bitmask to change + * @val: New value for bitmask + * + * Returns zero for success, a negative number on error. + */ +int regmap_update_bits(struct regmap *map, unsigned int reg, + unsigned int mask, unsigned int val) +{ + int ret; + unsigned int tmp; + + mutex_lock(&map->lock); + + ret = _regmap_read(map, reg, &tmp); + if (ret != 0) + goto out; + + tmp &= ~mask; + tmp |= val & mask; + + ret = _regmap_write(map, reg, tmp); + +out: + mutex_unlock(&map->lock); + + return ret; +} +EXPORT_SYMBOL_GPL(regmap_update_bits); diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c index c126db3cb7d1..e8d11b6630ee 100644 --- a/drivers/base/syscore.c +++ b/drivers/base/syscore.c @@ -9,6 +9,7 @@ #include <linux/syscore_ops.h> #include <linux/mutex.h> #include <linux/module.h> +#include <linux/interrupt.h> static LIST_HEAD(syscore_ops_list); static DEFINE_MUTEX(syscore_ops_lock); @@ -48,6 +49,13 @@ int syscore_suspend(void) struct syscore_ops *ops; int ret = 0; + pr_debug("Checking wakeup interrupts\n"); + + /* Return error code if there are any wakeup interrupts pending. */ + ret = check_wakeup_irqs(); + if (ret) + return ret; + WARN_ONCE(!irqs_disabled(), "Interrupts enabled before system core suspend.\n"); |