diff options
Diffstat (limited to 'drivers/mfd/sta2x11-mfd.c')
| -rw-r--r-- | drivers/mfd/sta2x11-mfd.c | 645 |
1 files changed, 0 insertions, 645 deletions
diff --git a/drivers/mfd/sta2x11-mfd.c b/drivers/mfd/sta2x11-mfd.c deleted file mode 100644 index 02cc49daf2e3..000000000000 --- a/drivers/mfd/sta2x11-mfd.c +++ /dev/null @@ -1,645 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * STA2x11 mfd for GPIO, SCTL and APBREG - * - * Copyright (c) 2009-2011 Wind River Systems, Inc. - * Copyright (c) 2011 ST Microelectronics (Alessandro Rubini, Davide Ciminaghi) - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/export.h> -#include <linux/spinlock.h> -#include <linux/errno.h> -#include <linux/device.h> -#include <linux/slab.h> -#include <linux/list.h> -#include <linux/io.h> -#include <linux/ioport.h> -#include <linux/pci.h> -#include <linux/seq_file.h> -#include <linux/platform_device.h> -#include <linux/mfd/core.h> -#include <linux/mfd/sta2x11-mfd.h> -#include <linux/regmap.h> - -#include <asm/sta2x11.h> - -static inline int __reg_within_range(unsigned int r, - unsigned int start, - unsigned int end) -{ - return ((r >= start) && (r <= end)); -} - -/* This describes STA2X11 MFD chip for us, we may have several */ -struct sta2x11_mfd { - struct sta2x11_instance *instance; - struct regmap *regmap[sta2x11_n_mfd_plat_devs]; - spinlock_t lock[sta2x11_n_mfd_plat_devs]; - struct list_head list; - void __iomem *regs[sta2x11_n_mfd_plat_devs]; -}; - -static LIST_HEAD(sta2x11_mfd_list); - -/* Three functions to act on the list */ -static struct sta2x11_mfd *sta2x11_mfd_find(struct pci_dev *pdev) -{ - struct sta2x11_instance *instance; - struct sta2x11_mfd *mfd; - - if (!pdev && !list_empty(&sta2x11_mfd_list)) { - pr_warn("%s: Unspecified device, using first instance\n", - __func__); - return list_entry(sta2x11_mfd_list.next, - struct sta2x11_mfd, list); - } - - instance = sta2x11_get_instance(pdev); - if (!instance) - return NULL; - list_for_each_entry(mfd, &sta2x11_mfd_list, list) { - if (mfd->instance == instance) - return mfd; - } - return NULL; -} - -static int sta2x11_mfd_add(struct pci_dev *pdev, gfp_t flags) -{ - int i; - struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev); - struct sta2x11_instance *instance; - - if (mfd) - return -EBUSY; - instance = sta2x11_get_instance(pdev); - if (!instance) - return -EINVAL; - mfd = kzalloc(sizeof(*mfd), flags); - if (!mfd) - return -ENOMEM; - INIT_LIST_HEAD(&mfd->list); - for (i = 0; i < ARRAY_SIZE(mfd->lock); i++) - spin_lock_init(&mfd->lock[i]); - mfd->instance = instance; - list_add(&mfd->list, &sta2x11_mfd_list); - return 0; -} - -/* This function is exported and is not expected to fail */ -u32 __sta2x11_mfd_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val, - enum sta2x11_mfd_plat_dev index) -{ - struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev); - u32 r; - unsigned long flags; - void __iomem *regs; - - if (!mfd) { - dev_warn(&pdev->dev, ": can't access sctl regs\n"); - return 0; - } - - regs = mfd->regs[index]; - if (!regs) { - dev_warn(&pdev->dev, ": system ctl not initialized\n"); - return 0; - } - spin_lock_irqsave(&mfd->lock[index], flags); - r = readl(regs + reg); - r &= ~mask; - r |= val; - if (mask) - writel(r, regs + reg); - spin_unlock_irqrestore(&mfd->lock[index], flags); - return r; -} -EXPORT_SYMBOL(__sta2x11_mfd_mask); - -int sta2x11_mfd_get_regs_data(struct platform_device *dev, - enum sta2x11_mfd_plat_dev index, - void __iomem **regs, - spinlock_t **lock) -{ - struct pci_dev *pdev = *(struct pci_dev **)dev_get_platdata(&dev->dev); - struct sta2x11_mfd *mfd; - - if (!pdev) - return -ENODEV; - mfd = sta2x11_mfd_find(pdev); - if (!mfd) - return -ENODEV; - if (index >= sta2x11_n_mfd_plat_devs) - return -ENODEV; - *regs = mfd->regs[index]; - *lock = &mfd->lock[index]; - pr_debug("%s %d *regs = %p\n", __func__, __LINE__, *regs); - return *regs ? 0 : -ENODEV; -} -EXPORT_SYMBOL(sta2x11_mfd_get_regs_data); - -/* - * Special sta2x11-mfd regmap lock/unlock functions - */ - -static void sta2x11_regmap_lock(void *__lock) -{ - spinlock_t *lock = __lock; - spin_lock(lock); -} - -static void sta2x11_regmap_unlock(void *__lock) -{ - spinlock_t *lock = __lock; - spin_unlock(lock); -} - -/* OTP (one time programmable registers do not require locking */ -static void sta2x11_regmap_nolock(void *__lock) -{ -} - -static const char *sta2x11_mfd_names[sta2x11_n_mfd_plat_devs] = { - [sta2x11_sctl] = STA2X11_MFD_SCTL_NAME, - [sta2x11_apbreg] = STA2X11_MFD_APBREG_NAME, - [sta2x11_apb_soc_regs] = STA2X11_MFD_APB_SOC_REGS_NAME, - [sta2x11_scr] = STA2X11_MFD_SCR_NAME, -}; - -static bool sta2x11_sctl_writeable_reg(struct device *dev, unsigned int reg) -{ - return !__reg_within_range(reg, SCTL_SCPCIECSBRST, SCTL_SCRSTSTA); -} - -static struct regmap_config sta2x11_sctl_regmap_config = { - .reg_bits = 32, - .reg_stride = 4, - .val_bits = 32, - .lock = sta2x11_regmap_lock, - .unlock = sta2x11_regmap_unlock, - .max_register = SCTL_SCRSTSTA, - .writeable_reg = sta2x11_sctl_writeable_reg, -}; - -static bool sta2x11_scr_readable_reg(struct device *dev, unsigned int reg) -{ - return (reg == STA2X11_SECR_CR) || - __reg_within_range(reg, STA2X11_SECR_FVR0, STA2X11_SECR_FVR1); -} - -static bool sta2x11_scr_writeable_reg(struct device *dev, unsigned int reg) -{ - return false; -} - -static struct regmap_config sta2x11_scr_regmap_config = { - .reg_bits = 32, - .reg_stride = 4, - .val_bits = 32, - .lock = sta2x11_regmap_nolock, - .unlock = sta2x11_regmap_nolock, - .max_register = STA2X11_SECR_FVR1, - .readable_reg = sta2x11_scr_readable_reg, - .writeable_reg = sta2x11_scr_writeable_reg, -}; - -static bool sta2x11_apbreg_readable_reg(struct device *dev, unsigned int reg) -{ - /* Two blocks (CAN and MLB, SARAC) 0x100 bytes apart */ - if (reg >= APBREG_BSR_SARAC) - reg -= APBREG_BSR_SARAC; - switch (reg) { - case APBREG_BSR: - case APBREG_PAER: - case APBREG_PWAC: - case APBREG_PRAC: - case APBREG_PCG: - case APBREG_PUR: - case APBREG_EMU_PCG: - return true; - default: - return false; - } -} - -static bool sta2x11_apbreg_writeable_reg(struct device *dev, unsigned int reg) -{ - if (reg >= APBREG_BSR_SARAC) - reg -= APBREG_BSR_SARAC; - if (!sta2x11_apbreg_readable_reg(dev, reg)) - return false; - return reg != APBREG_PAER; -} - -static struct regmap_config sta2x11_apbreg_regmap_config = { - .reg_bits = 32, - .reg_stride = 4, - .val_bits = 32, - .lock = sta2x11_regmap_lock, - .unlock = sta2x11_regmap_unlock, - .max_register = APBREG_EMU_PCG_SARAC, - .readable_reg = sta2x11_apbreg_readable_reg, - .writeable_reg = sta2x11_apbreg_writeable_reg, -}; - -static bool sta2x11_apb_soc_regs_readable_reg(struct device *dev, - unsigned int reg) -{ - return reg <= PCIE_SoC_INT_ROUTER_STATUS3_REG || - __reg_within_range(reg, DMA_IP_CTRL_REG, SPARE3_RESERVED) || - __reg_within_range(reg, MASTER_LOCK_REG, - SYSTEM_CONFIG_STATUS_REG) || - reg == MSP_CLK_CTRL_REG || - __reg_within_range(reg, COMPENSATION_REG1, TEST_CTL_REG); -} - -static bool sta2x11_apb_soc_regs_writeable_reg(struct device *dev, - unsigned int reg) -{ - if (!sta2x11_apb_soc_regs_readable_reg(dev, reg)) - return false; - switch (reg) { - case PCIE_COMMON_CLOCK_CONFIG_0_4_0: - case SYSTEM_CONFIG_STATUS_REG: - case COMPENSATION_REG1: - case PCIE_SoC_INT_ROUTER_STATUS0_REG...PCIE_SoC_INT_ROUTER_STATUS3_REG: - case PCIE_PM_STATUS_0_PORT_0_4...PCIE_PM_STATUS_7_0_EP4: - return false; - default: - return true; - } -} - -static struct regmap_config sta2x11_apb_soc_regs_regmap_config = { - .reg_bits = 32, - .reg_stride = 4, - .val_bits = 32, - .lock = sta2x11_regmap_lock, - .unlock = sta2x11_regmap_unlock, - .max_register = TEST_CTL_REG, - .readable_reg = sta2x11_apb_soc_regs_readable_reg, - .writeable_reg = sta2x11_apb_soc_regs_writeable_reg, -}; - -static struct regmap_config * -sta2x11_mfd_regmap_configs[sta2x11_n_mfd_plat_devs] = { - [sta2x11_sctl] = &sta2x11_sctl_regmap_config, - [sta2x11_apbreg] = &sta2x11_apbreg_regmap_config, - [sta2x11_apb_soc_regs] = &sta2x11_apb_soc_regs_regmap_config, - [sta2x11_scr] = &sta2x11_scr_regmap_config, -}; - -/* Probe for the four platform devices */ - -static int sta2x11_mfd_platform_probe(struct platform_device *dev, - enum sta2x11_mfd_plat_dev index) -{ - struct pci_dev **pdev; - struct sta2x11_mfd *mfd; - struct resource *res; - const char *name = sta2x11_mfd_names[index]; - struct regmap_config *regmap_config = sta2x11_mfd_regmap_configs[index]; - - pdev = dev_get_platdata(&dev->dev); - mfd = sta2x11_mfd_find(*pdev); - if (!mfd) - return -ENODEV; - if (!regmap_config) - return -ENODEV; - - res = platform_get_resource(dev, IORESOURCE_MEM, 0); - if (!res) - return -ENOMEM; - - if (!request_mem_region(res->start, resource_size(res), name)) - return -EBUSY; - - mfd->regs[index] = ioremap(res->start, resource_size(res)); - if (!mfd->regs[index]) { - release_mem_region(res->start, resource_size(res)); - return -ENOMEM; - } - regmap_config->lock_arg = &mfd->lock; - /* - No caching, registers could be reached both via regmap and via - void __iomem * - */ - regmap_config->cache_type = REGCACHE_NONE; - mfd->regmap[index] = devm_regmap_init_mmio(&dev->dev, mfd->regs[index], - regmap_config); - WARN_ON(IS_ERR(mfd->regmap[index])); - - return 0; -} - -static int sta2x11_sctl_probe(struct platform_device *dev) -{ - return sta2x11_mfd_platform_probe(dev, sta2x11_sctl); -} - -static int sta2x11_apbreg_probe(struct platform_device *dev) -{ - return sta2x11_mfd_platform_probe(dev, sta2x11_apbreg); -} - -static int sta2x11_apb_soc_regs_probe(struct platform_device *dev) -{ - return sta2x11_mfd_platform_probe(dev, sta2x11_apb_soc_regs); -} - -static int sta2x11_scr_probe(struct platform_device *dev) -{ - return sta2x11_mfd_platform_probe(dev, sta2x11_scr); -} - -/* The three platform drivers */ -static struct platform_driver sta2x11_sctl_platform_driver = { - .driver = { - .name = STA2X11_MFD_SCTL_NAME, - }, - .probe = sta2x11_sctl_probe, -}; - -static struct platform_driver sta2x11_platform_driver = { - .driver = { - .name = STA2X11_MFD_APBREG_NAME, - }, - .probe = sta2x11_apbreg_probe, -}; - -static struct platform_driver sta2x11_apb_soc_regs_platform_driver = { - .driver = { - .name = STA2X11_MFD_APB_SOC_REGS_NAME, - }, - .probe = sta2x11_apb_soc_regs_probe, -}; - -static struct platform_driver sta2x11_scr_platform_driver = { - .driver = { - .name = STA2X11_MFD_SCR_NAME, - }, - .probe = sta2x11_scr_probe, -}; - -static struct platform_driver * const drivers[] = { - &sta2x11_platform_driver, - &sta2x11_sctl_platform_driver, - &sta2x11_apb_soc_regs_platform_driver, - &sta2x11_scr_platform_driver, -}; - -static int __init sta2x11_drivers_init(void) -{ - return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); -} - -/* - * What follows are the PCI devices that host the above pdevs. - * Each logic block is 4kB and they are all consecutive: we use this info. - */ - -/* Mfd 0 device */ - -/* Mfd 0, Bar 0 */ -enum mfd0_bar0_cells { - STA2X11_GPIO_0 = 0, - STA2X11_GPIO_1, - STA2X11_GPIO_2, - STA2X11_GPIO_3, - STA2X11_SCTL, - STA2X11_SCR, - STA2X11_TIME, -}; -/* Mfd 0 , Bar 1 */ -enum mfd0_bar1_cells { - STA2X11_APBREG = 0, -}; -#define CELL_4K(_name, _cell) { \ - .name = _name, \ - .start = _cell * 4096, .end = _cell * 4096 + 4095, \ - .flags = IORESOURCE_MEM, \ - } - -static const struct resource gpio_resources[] = { - { - /* 4 consecutive cells, 1 driver */ - .name = STA2X11_MFD_GPIO_NAME, - .start = 0, - .end = (4 * 4096) - 1, - .flags = IORESOURCE_MEM, - } -}; -static const struct resource sctl_resources[] = { - CELL_4K(STA2X11_MFD_SCTL_NAME, STA2X11_SCTL), -}; -static const struct resource scr_resources[] = { - CELL_4K(STA2X11_MFD_SCR_NAME, STA2X11_SCR), -}; -static const struct resource time_resources[] = { - CELL_4K(STA2X11_MFD_TIME_NAME, STA2X11_TIME), -}; - -static const struct resource apbreg_resources[] = { - CELL_4K(STA2X11_MFD_APBREG_NAME, STA2X11_APBREG), -}; - -#define DEV(_name, _r) \ - { .name = _name, .num_resources = ARRAY_SIZE(_r), .resources = _r, } - -static struct mfd_cell sta2x11_mfd0_bar0[] = { - /* offset 0: we add pdata later */ - DEV(STA2X11_MFD_GPIO_NAME, gpio_resources), - DEV(STA2X11_MFD_SCTL_NAME, sctl_resources), - DEV(STA2X11_MFD_SCR_NAME, scr_resources), - DEV(STA2X11_MFD_TIME_NAME, time_resources), -}; - -static struct mfd_cell sta2x11_mfd0_bar1[] = { - DEV(STA2X11_MFD_APBREG_NAME, apbreg_resources), -}; - -/* Mfd 1 devices */ - -/* Mfd 1, Bar 0 */ -enum mfd1_bar0_cells { - STA2X11_VIC = 0, -}; - -/* Mfd 1, Bar 1 */ -enum mfd1_bar1_cells { - STA2X11_APB_SOC_REGS = 0, -}; - -static const struct resource vic_resources[] = { - CELL_4K(STA2X11_MFD_VIC_NAME, STA2X11_VIC), -}; - -static const struct resource apb_soc_regs_resources[] = { - CELL_4K(STA2X11_MFD_APB_SOC_REGS_NAME, STA2X11_APB_SOC_REGS), -}; - -static struct mfd_cell sta2x11_mfd1_bar0[] = { - DEV(STA2X11_MFD_VIC_NAME, vic_resources), -}; - -static struct mfd_cell sta2x11_mfd1_bar1[] = { - DEV(STA2X11_MFD_APB_SOC_REGS_NAME, apb_soc_regs_resources), -}; - - -static int sta2x11_mfd_suspend(struct pci_dev *pdev, pm_message_t state) -{ - pci_save_state(pdev); - pci_disable_device(pdev); - pci_set_power_state(pdev, pci_choose_state(pdev, state)); - - return 0; -} - -static int sta2x11_mfd_resume(struct pci_dev *pdev) -{ - int err; - - pci_set_power_state(pdev, PCI_D0); - err = pci_enable_device(pdev); - if (err) - return err; - pci_restore_state(pdev); - - return 0; -} - -struct sta2x11_mfd_bar_setup_data { - struct mfd_cell *cells; - int ncells; -}; - -struct sta2x11_mfd_setup_data { - struct sta2x11_mfd_bar_setup_data bars[2]; -}; - -#define STA2X11_MFD0 0 -#define STA2X11_MFD1 1 - -static struct sta2x11_mfd_setup_data mfd_setup_data[] = { - /* Mfd 0: gpio, sctl, scr, timers / apbregs */ - [STA2X11_MFD0] = { - .bars = { - [0] = { - .cells = sta2x11_mfd0_bar0, - .ncells = ARRAY_SIZE(sta2x11_mfd0_bar0), - }, - [1] = { - .cells = sta2x11_mfd0_bar1, - .ncells = ARRAY_SIZE(sta2x11_mfd0_bar1), - }, - }, - }, - /* Mfd 1: vic / apb-soc-regs */ - [STA2X11_MFD1] = { - .bars = { - [0] = { - .cells = sta2x11_mfd1_bar0, - .ncells = ARRAY_SIZE(sta2x11_mfd1_bar0), - }, - [1] = { - .cells = sta2x11_mfd1_bar1, - .ncells = ARRAY_SIZE(sta2x11_mfd1_bar1), - }, - }, - }, -}; - -static void sta2x11_mfd_setup(struct pci_dev *pdev, - struct sta2x11_mfd_setup_data *sd) -{ - int i, j; - for (i = 0; i < ARRAY_SIZE(sd->bars); i++) - for (j = 0; j < sd->bars[i].ncells; j++) { - sd->bars[i].cells[j].pdata_size = sizeof(pdev); - sd->bars[i].cells[j].platform_data = &pdev; - } -} - -static int sta2x11_mfd_probe(struct pci_dev *pdev, - const struct pci_device_id *pci_id) -{ - int err, i; - struct sta2x11_mfd_setup_data *setup_data; - - dev_info(&pdev->dev, "%s\n", __func__); - - err = pci_enable_device(pdev); - if (err) { - dev_err(&pdev->dev, "Can't enable device.\n"); - return err; - } - - err = pci_enable_msi(pdev); - if (err) - dev_info(&pdev->dev, "Enable msi failed\n"); - - setup_data = pci_id->device == PCI_DEVICE_ID_STMICRO_GPIO ? - &mfd_setup_data[STA2X11_MFD0] : - &mfd_setup_data[STA2X11_MFD1]; - - /* platform data is the pci device for all of them */ - sta2x11_mfd_setup(pdev, setup_data); - - /* Record this pdev before mfd_add_devices: their probe looks for it */ - if (!sta2x11_mfd_find(pdev)) - sta2x11_mfd_add(pdev, GFP_KERNEL); - - /* Just 2 bars for all mfd's at present */ - for (i = 0; i < 2; i++) { - err = mfd_add_devices(&pdev->dev, -1, - setup_data->bars[i].cells, - setup_data->bars[i].ncells, - &pdev->resource[i], - 0, NULL); - if (err) { - dev_err(&pdev->dev, - "mfd_add_devices[%d] failed: %d\n", i, err); - goto err_disable; - } - } - - return 0; - -err_disable: - mfd_remove_devices(&pdev->dev); - pci_disable_device(pdev); - pci_disable_msi(pdev); - return err; -} - -static const struct pci_device_id sta2x11_mfd_tbl[] = { - {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_GPIO)}, - {PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_VIC)}, - {0,}, -}; - -static struct pci_driver sta2x11_mfd_driver = { - .name = "sta2x11-mfd", - .id_table = sta2x11_mfd_tbl, - .probe = sta2x11_mfd_probe, - .suspend = sta2x11_mfd_suspend, - .resume = sta2x11_mfd_resume, -}; - -static int __init sta2x11_mfd_init(void) -{ - pr_info("%s\n", __func__); - return pci_register_driver(&sta2x11_mfd_driver); -} - -/* - * All of this must be ready before "normal" devices like MMCI appear. - * But MFD (the pci device) can't be too early. The following choice - * prepares platform drivers very early and probe the PCI device later, - * but before other PCI devices. - */ -subsys_initcall(sta2x11_drivers_init); -rootfs_initcall(sta2x11_mfd_init); |