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i2400m/SDIO: probe/disconnect, dev init/shutdown and reset backends

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Implements probe/disconnect for the SDIO device, as well as main
backends for the generic driver to control the SDIO device
(bus_dev_start(), bus_dev_stop() and bus_reset()).

Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Inaky Perez-Gonzalez 2008-12-20 16:57:55 -08:00 committed by Greg Kroah-Hartman
parent 17d559af96
commit a0848826bf
1 changed files with 511 additions and 0 deletions
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511
drivers/net/wimax/i2400m/sdio.c Normal file
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/*
* 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);