diff options
Diffstat (limited to 'drivers/net/wimax/i2400m/sdio.c')
| -rw-r--r-- | drivers/net/wimax/i2400m/sdio.c | 511 |
1 files changed, 511 insertions, 0 deletions
diff --git a/drivers/net/wimax/i2400m/sdio.c b/drivers/net/wimax/i2400m/sdio.c new file mode 100644 index 000000000000..1bfa283bbd8a --- /dev/null +++ b/drivers/net/wimax/i2400m/sdio.c @@ -0,0 +1,511 @@ +/* + * Intel Wireless WiMAX Connection 2400m + * Linux driver model glue for the SDIO device, reset & fw upload + * + * + * Copyright (C) 2007-2008 Intel Corporation <linux-wimax@intel.com> + * Dirk Brandewie <dirk.j.brandewie@intel.com> + * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> + * Yanir Lubetkin <yanirx.lubetkin@intel.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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + * + * + * See i2400m-sdio.h for a general description of this driver. + * + * This file implements driver model glue, and hook ups for the + * generic driver to implement the bus-specific functions (device + * communication setup/tear down, firmware upload and resetting). + * + * ROADMAP + * + * i2400m_probe() + * alloc_netdev() + * i2400ms_netdev_setup() + * i2400ms_init() + * i2400m_netdev_setup() + * i2400ms_enable_function() + * i2400m_setup() + * + * i2400m_remove() + * i2400m_release() + * free_netdev(net_dev) + * + * i2400ms_bus_reset() Called by i2400m->bus_reset + * __i2400ms_reset() + * __i2400ms_send_barker() + * + * i2400ms_bus_dev_start() Called by i2400m_dev_start() [who is + * i2400ms_tx_setup() called by i2400m_setup()] + * i2400ms_rx_setup() + * + * i2400ms_bus_dev_stop() Called by i2400m_dev_stop() [who is + * i2400ms_rx_release() is called by i2400m_release()] + * i2400ms_tx_release() + * + */ + +#include <linux/debugfs.h> +#include <linux/mmc/sdio.h> +#include <linux/mmc/sdio_func.h> +#include "i2400m-sdio.h" +#include <linux/wimax/i2400m.h> + +#define D_SUBMODULE main +#include "sdio-debug-levels.h" + +/* IOE WiMAX function timeout in seconds */ +static int ioe_timeout = 2; +module_param(ioe_timeout, int, 0); + +/* Our firmware file name */ +#define I2400MS_FW_FILE_NAME "i2400m-fw-sdio-" I2400M_FW_VERSION ".sbcf" + +/* + * Enable the SDIO function + * + * Tries to enable the SDIO function; might fail if it is still not + * ready (in some hardware, the SDIO WiMAX function is only enabled + * when we ask it to explicitly doing). Tries until a timeout is + * reached. + * + * The reverse of this is...sdio_disable_function() + * + * Returns: 0 if the SDIO function was enabled, < 0 errno code on + * error (-ENODEV when it was unable to enable the function). + */ +static +int i2400ms_enable_function(struct sdio_func *func) +{ + u64 timeout; + int err; + struct device *dev = &func->dev; + + d_fnstart(3, dev, "(func %p)\n", func); + /* Setup timeout (FIXME: This needs to read the CIS table to + * get a real timeout) and then wait for the device to signal + * it is ready */ + timeout = get_jiffies_64() + ioe_timeout * HZ; + err = -ENODEV; + while (err != 0 && time_before64(get_jiffies_64(), timeout)) { + sdio_claim_host(func); + err = sdio_enable_func(func); + if (0 == err) { + sdio_release_host(func); + d_printf(2, dev, "SDIO function enabled\n"); + goto function_enabled; + } + d_printf(2, dev, "SDIO function failed to enable: %d\n", err); + sdio_disable_func(func); + sdio_release_host(func); + msleep(I2400MS_INIT_SLEEP_INTERVAL); + } + /* If timed out, device is not there yet -- get -ENODEV so + * the device driver core will retry later on. */ + if (err == -ETIME) { + dev_err(dev, "Can't enable WiMAX function; " + " has the function been enabled?\n"); + err = -ENODEV; + } +function_enabled: + d_fnend(3, dev, "(func %p) = %d\n", func, err); + return err; +} + + +/* + * Setup driver resources needed to communicate with the device + * + * The fw needs some time to settle, and it was just uploaded, + * so give it a break first. I'd prefer to just wait for the device to + * send something, but seems the poking we do to enable SDIO stuff + * interferes with it, so just give it a break before starting... + */ +static +int i2400ms_bus_dev_start(struct i2400m *i2400m) +{ + int result; + struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m); + struct sdio_func *func = i2400ms->func; + struct device *dev = &func->dev; + + d_fnstart(3, dev, "(i2400m %p)\n", i2400m); + msleep(200); + result = i2400ms_rx_setup(i2400ms); + if (result < 0) + goto error_rx_setup; + result = i2400ms_tx_setup(i2400ms); + if (result < 0) + goto error_tx_setup; + d_fnend(3, dev, "(i2400m %p) = %d\n", i2400m, result); + return result; + + i2400ms_tx_release(i2400ms); +error_tx_setup: + i2400ms_rx_release(i2400ms); +error_rx_setup: + d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); + return result; +} + + +static +void i2400ms_bus_dev_stop(struct i2400m *i2400m) +{ + struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m); + struct sdio_func *func = i2400ms->func; + struct device *dev = &func->dev; + + d_fnstart(3, dev, "(i2400m %p)\n", i2400m); + i2400ms_rx_release(i2400ms); + i2400ms_tx_release(i2400ms); + d_fnend(3, dev, "(i2400m %p) = void\n", i2400m); +} + + +/* + * Sends a barker buffer to the device + * + * This helper will allocate a kmalloced buffer and use it to transmit + * (then free it). Reason for this is that the SDIO host controller + * expects alignment (unknown exactly which) which the stack won't + * really provide and certain arches/host-controller combinations + * cannot use stack/vmalloc/text areas for DMA transfers. + */ +static +int __i2400ms_send_barker(struct i2400ms *i2400ms, + const __le32 *barker, size_t barker_size) +{ + int ret; + struct sdio_func *func = i2400ms->func; + struct device *dev = &func->dev; + void *buffer; + + ret = -ENOMEM; + buffer = kmalloc(I2400MS_BLK_SIZE, GFP_KERNEL); + if (buffer == NULL) + goto error_kzalloc; + + memcpy(buffer, barker, barker_size); + sdio_claim_host(func); + ret = sdio_memcpy_toio(func, 0, buffer, I2400MS_BLK_SIZE); + sdio_release_host(func); + + if (ret < 0) + d_printf(0, dev, "E: barker error: %d\n", ret); + + kfree(buffer); +error_kzalloc: + return ret; +} + + +/* + * Reset a device at different levels (warm, cold or bus) + * + * @i2400ms: device descriptor + * @reset_type: soft, warm or bus reset (I2400M_RT_WARM/SOFT/BUS) + * + * FIXME: not tested -- need to confirm expected effects + * + * Warm and cold resets get an SDIO reset if they fail (unimplemented) + * + * Warm reset: + * + * The device will be fully reset internally, but won't be + * disconnected from the USB bus (so no reenumeration will + * happen). Firmware upload will be neccessary. + * + * The device will send a reboot barker in the notification endpoint + * that will trigger the driver to reinitialize the state + * automatically from notif.c:i2400m_notification_grok() into + * i2400m_dev_bootstrap_delayed(). + * + * Cold and bus (USB) reset: + * + * The device will be fully reset internally, disconnected from the + * USB bus an a reenumeration will happen. Firmware upload will be + * neccessary. Thus, we don't do any locking or struct + * reinitialization, as we are going to be fully disconnected and + * reenumerated. + * + * Note we need to return -ENODEV if a warm reset was requested and we + * had to resort to a bus reset. See i2400m_op_reset(), wimax_reset() + * and wimax_dev->op_reset. + * + * WARNING: no driver state saved/fixed + */ +static +int i2400ms_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt) +{ + int result; + struct i2400ms *i2400ms = + container_of(i2400m, struct i2400ms, i2400m); + struct device *dev = i2400m_dev(i2400m); + static const __le32 i2400m_WARM_BOOT_BARKER[4] = { + __constant_cpu_to_le32(I2400M_WARM_RESET_BARKER), + __constant_cpu_to_le32(I2400M_WARM_RESET_BARKER), + __constant_cpu_to_le32(I2400M_WARM_RESET_BARKER), + __constant_cpu_to_le32(I2400M_WARM_RESET_BARKER), + }; + static const __le32 i2400m_COLD_BOOT_BARKER[4] = { + __constant_cpu_to_le32(I2400M_COLD_RESET_BARKER), + __constant_cpu_to_le32(I2400M_COLD_RESET_BARKER), + __constant_cpu_to_le32(I2400M_COLD_RESET_BARKER), + __constant_cpu_to_le32(I2400M_COLD_RESET_BARKER), + }; + + if (rt == I2400M_RT_WARM) + result = __i2400ms_send_barker(i2400ms, i2400m_WARM_BOOT_BARKER, + sizeof(i2400m_WARM_BOOT_BARKER)); + else if (rt == I2400M_RT_COLD) + result = __i2400ms_send_barker(i2400ms, i2400m_COLD_BOOT_BARKER, + sizeof(i2400m_COLD_BOOT_BARKER)); + else if (rt == I2400M_RT_BUS) { +do_bus_reset: + dev_err(dev, "FIXME: SDIO bus reset not implemented\n"); + result = rt == I2400M_RT_WARM ? -ENODEV : -ENOSYS; + } else + BUG(); + if (result < 0 && rt != I2400M_RT_BUS) { + dev_err(dev, "%s reset failed (%d); trying SDIO reset\n", + rt == I2400M_RT_WARM ? "warm" : "cold", result); + rt = I2400M_RT_BUS; + goto do_bus_reset; + } + return result; +} + + +static +void i2400ms_netdev_setup(struct net_device *net_dev) +{ + struct i2400m *i2400m = net_dev_to_i2400m(net_dev); + struct i2400ms *i2400ms = container_of(i2400m, struct i2400ms, i2400m); + i2400ms_init(i2400ms); + i2400m_netdev_setup(net_dev); +} + + +/* + * Debug levels control; see debug.h + */ +struct d_level D_LEVEL[] = { + D_SUBMODULE_DEFINE(main), + D_SUBMODULE_DEFINE(tx), + D_SUBMODULE_DEFINE(rx), + D_SUBMODULE_DEFINE(fw), +}; +size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL); + + +#define __debugfs_register(prefix, name, parent) \ +do { \ + result = d_level_register_debugfs(prefix, name, parent); \ + if (result < 0) \ + goto error; \ +} while (0) + + +static +int i2400ms_debugfs_add(struct i2400ms *i2400ms) +{ + int result; + struct dentry *dentry = i2400ms->i2400m.wimax_dev.debugfs_dentry; + + dentry = debugfs_create_dir("i2400m-usb", dentry); + result = PTR_ERR(dentry); + if (IS_ERR(dentry)) { + if (result == -ENODEV) + result = 0; /* No debugfs support */ + goto error; + } + i2400ms->debugfs_dentry = dentry; + __debugfs_register("dl_", main, dentry); + __debugfs_register("dl_", tx, dentry); + __debugfs_register("dl_", rx, dentry); + __debugfs_register("dl_", fw, dentry); + + return 0; + +error: + debugfs_remove_recursive(i2400ms->debugfs_dentry); + return result; +} + + +/* + * Probe a i2400m interface and register it + * + * @func: SDIO function + * @id: SDIO device ID + * @returns: 0 if ok, < 0 errno code on error. + * + * Alloc a net device, initialize the bus-specific details and then + * calls the bus-generic initialization routine. That will register + * the wimax and netdev devices, upload the firmware [using + * _bus_bm_*()], call _bus_dev_start() to finalize the setup of the + * communication with the device and then will start to talk to it to + * finnish setting it up. + * + * Initialization is tricky; some instances of the hw are packed with + * others in a way that requires a third driver that enables the WiMAX + * function. In those cases, we can't enable the SDIO function and + * we'll return with -ENODEV. When the driver that enables the WiMAX + * function does its thing, it has to do a bus_rescan_devices() on the + * SDIO bus so this driver is called again to enumerate the WiMAX + * function. + */ +static +int i2400ms_probe(struct sdio_func *func, + const struct sdio_device_id *id) +{ + int result; + struct net_device *net_dev; + struct device *dev = &func->dev; + struct i2400m *i2400m; + struct i2400ms *i2400ms; + + /* Allocate instance [calls i2400m_netdev_setup() on it]. */ + result = -ENOMEM; + net_dev = alloc_netdev(sizeof(*i2400ms), "wmx%d", + i2400ms_netdev_setup); + if (net_dev == NULL) { + dev_err(dev, "no memory for network device instance\n"); + goto error_alloc_netdev; + } + SET_NETDEV_DEV(net_dev, dev); + i2400m = net_dev_to_i2400m(net_dev); + i2400ms = container_of(i2400m, struct i2400ms, i2400m); + i2400m->wimax_dev.net_dev = net_dev; + i2400ms->func = func; + sdio_set_drvdata(func, i2400ms); + + i2400m->bus_tx_block_size = I2400MS_BLK_SIZE; + i2400m->bus_pl_size_max = I2400MS_PL_SIZE_MAX; + i2400m->bus_dev_start = i2400ms_bus_dev_start; + i2400m->bus_dev_stop = i2400ms_bus_dev_stop; + i2400m->bus_tx_kick = i2400ms_bus_tx_kick; + i2400m->bus_reset = i2400ms_bus_reset; + i2400m->bus_bm_cmd_send = i2400ms_bus_bm_cmd_send; + i2400m->bus_bm_wait_for_ack = i2400ms_bus_bm_wait_for_ack; + i2400m->bus_fw_name = I2400MS_FW_FILE_NAME; + i2400m->bus_bm_mac_addr_impaired = 1; + + result = i2400ms_enable_function(i2400ms->func); + if (result < 0) { + dev_err(dev, "Cannot enable SDIO function: %d\n", result); + goto error_func_enable; + } + + sdio_claim_host(func); + result = sdio_set_block_size(func, I2400MS_BLK_SIZE); + if (result < 0) { + dev_err(dev, "Failed to set block size: %d\n", result); + goto error_set_blk_size; + } + sdio_release_host(func); + + result = i2400m_setup(i2400m, I2400M_BRI_NO_REBOOT); + if (result < 0) { + dev_err(dev, "cannot setup device: %d\n", result); + goto error_setup; + } + + result = i2400ms_debugfs_add(i2400ms); + if (result < 0) { + dev_err(dev, "cannot create SDIO debugfs: %d\n", + result); + goto error_debugfs_add; + } + return 0; + +error_debugfs_add: + i2400m_release(i2400m); +error_setup: + sdio_set_drvdata(func, NULL); + sdio_claim_host(func); +error_set_blk_size: + sdio_disable_func(func); + sdio_release_host(func); +error_func_enable: + free_netdev(net_dev); +error_alloc_netdev: + return result; +} + + +static +void i2400ms_remove(struct sdio_func *func) +{ + struct device *dev = &func->dev; + struct i2400ms *i2400ms = sdio_get_drvdata(func); + struct i2400m *i2400m = &i2400ms->i2400m; + struct net_device *net_dev = i2400m->wimax_dev.net_dev; + + d_fnstart(3, dev, "SDIO func %p\n", func); + debugfs_remove_recursive(i2400ms->debugfs_dentry); + i2400m_release(i2400m); + sdio_set_drvdata(func, NULL); + sdio_claim_host(func); + sdio_disable_func(func); + sdio_release_host(func); + free_netdev(net_dev); + d_fnend(3, dev, "SDIO func %p\n", func); +} + +enum { + I2400MS_INTEL_VID = 0x89, +}; + +static +const struct sdio_device_id i2400ms_sdio_ids[] = { + /* Intel: i2400m WiMAX over SDIO */ + { SDIO_DEVICE(I2400MS_INTEL_VID, 0x1402) }, + { }, /* end: all zeroes */ +}; +MODULE_DEVICE_TABLE(sdio, i2400ms_sdio_ids); + + +static +struct sdio_driver i2400m_sdio_driver = { + .name = KBUILD_MODNAME, + .probe = i2400ms_probe, + .remove = i2400ms_remove, + .id_table = i2400ms_sdio_ids, +}; + + +static +int __init i2400ms_driver_init(void) +{ + return sdio_register_driver(&i2400m_sdio_driver); +} +module_init(i2400ms_driver_init); + + +static +void __exit i2400ms_driver_exit(void) +{ + flush_scheduled_work(); /* for the stuff we schedule */ + sdio_unregister_driver(&i2400m_sdio_driver); +} +module_exit(i2400ms_driver_exit); + + +MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>"); +MODULE_DESCRIPTION("Intel 2400M WiMAX networking for SDIO"); +MODULE_LICENSE("GPL"); +MODULE_FIRMWARE(I2400MS_FW_FILE_NAME); |