drivers/net/wireless/ti/wl1251/sdio.c - arm/linux - Git at Google

 /*
  * wl12xx SDIO routines
  *
  * 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 St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  * Copyright (C) 2005 Texas Instruments Incorporated
  * Copyright (C) 2008 Google Inc
  * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
  */
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/mmc/sdio_func.h>
 #include <linux/mmc/sdio_ids.h>
 #include <linux/platform_device.h>
 #include <linux/wl12xx.h>
 #include <linux/irq.h>
 #include <linux/pm_runtime.h>
 #include <linux/gpio.h>

 #include "wl1251.h"

 #ifndef SDIO_VENDOR_ID_TI
 #define SDIO_VENDOR_ID_TI		0x104c
 #endif

 #ifndef SDIO_DEVICE_ID_TI_WL1251
 #define SDIO_DEVICE_ID_TI_WL1251	0x9066
 #endif

 struct wl1251_sdio {
 	struct sdio_func *func;
 	u32 elp_val;
 };

 static struct sdio_func *wl_to_func(struct wl1251 *wl)
 {
 	struct wl1251_sdio *wl_sdio = wl->if_priv;
 	return wl_sdio->func;
 }

 static void wl1251_sdio_interrupt(struct sdio_func *func)
 {
 	struct wl1251 *wl = sdio_get_drvdata(func);

 	wl1251_debug(DEBUG_IRQ, "IRQ");

 	/* FIXME should be synchronous for sdio */
 	ieee80211_queue_work(wl->hw, &wl->irq_work);
 }

 static const struct sdio_device_id wl1251_devices[] = {
 	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
 	{}
 };
 MODULE_DEVICE_TABLE(sdio, wl1251_devices);


 static void wl1251_sdio_read(struct wl1251 *wl, int addr,
 			     void *buf, size_t len)
 {
 	int ret;
 	struct sdio_func *func = wl_to_func(wl);

 	sdio_claim_host(func);
 	ret = sdio_memcpy_fromio(func, buf, addr, len);
 	if (ret)
 		wl1251_error("sdio read failed (%d)", ret);
 	sdio_release_host(func);
 }

 static void wl1251_sdio_write(struct wl1251 *wl, int addr,
 			      void *buf, size_t len)
 {
 	int ret;
 	struct sdio_func *func = wl_to_func(wl);

 	sdio_claim_host(func);
 	ret = sdio_memcpy_toio(func, addr, buf, len);
 	if (ret)
 		wl1251_error("sdio write failed (%d)", ret);
 	sdio_release_host(func);
 }

 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
 {
 	int ret = 0;
 	struct wl1251_sdio *wl_sdio = wl->if_priv;
 	struct sdio_func *func = wl_sdio->func;

 	/*
 	 * The hardware only supports RAW (read after write) access for
 	 * reading, regular sdio_readb won't work here (it interprets
 	 * the unused bits of CMD52 as write data even if we send read
 	 * request).
 	 */
 	sdio_claim_host(func);
 	*val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
 	sdio_release_host(func);

 	if (ret)
 		wl1251_error("sdio_readb failed (%d)", ret);
 }

 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
 {
 	int ret = 0;
 	struct wl1251_sdio *wl_sdio = wl->if_priv;
 	struct sdio_func *func = wl_sdio->func;

 	sdio_claim_host(func);
 	sdio_writeb(func, val, addr, &ret);
 	sdio_release_host(func);

 	if (ret)
 		wl1251_error("sdio_writeb failed (%d)", ret);
 	else
 		wl_sdio->elp_val = val;
 }

 static void wl1251_sdio_reset(struct wl1251 *wl)
 {
 }

 static void wl1251_sdio_enable_irq(struct wl1251 *wl)
 {
 	struct sdio_func *func = wl_to_func(wl);

 	sdio_claim_host(func);
 	sdio_claim_irq(func, wl1251_sdio_interrupt);
 	sdio_release_host(func);
 }

 static void wl1251_sdio_disable_irq(struct wl1251 *wl)
 {
 	struct sdio_func *func = wl_to_func(wl);

 	sdio_claim_host(func);
 	sdio_release_irq(func);
 	sdio_release_host(func);
 }

 /* Interrupts when using dedicated WLAN_IRQ pin */
 static irqreturn_t wl1251_line_irq(int irq, void *cookie)
 {
 	struct wl1251 *wl = cookie;

 	ieee80211_queue_work(wl->hw, &wl->irq_work);

 	return IRQ_HANDLED;
 }

 static void wl1251_enable_line_irq(struct wl1251 *wl)
 {
 	return enable_irq(wl->irq);
 }

 static void wl1251_disable_line_irq(struct wl1251 *wl)
 {
 	return disable_irq(wl->irq);
 }

 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
 {
 	struct sdio_func *func = wl_to_func(wl);
 	int ret;

 	if (enable) {
 		/*
 		 * Power is controlled by runtime PM, but we still call board
 		 * callback in case it wants to do any additional setup,
 		 * for example enabling clock buffer for the module.
 		 */
 		if (gpio_is_valid(wl->power_gpio))
 			gpio_set_value(wl->power_gpio, true);


 		ret = pm_runtime_get_sync(&func->dev);
 		if (ret < 0) {
 			pm_runtime_put_sync(&func->dev);
 			goto out;
 		}

 		sdio_claim_host(func);
 		sdio_enable_func(func);
 		sdio_release_host(func);
 	} else {
 		sdio_claim_host(func);
 		sdio_disable_func(func);
 		sdio_release_host(func);

 		ret = pm_runtime_put_sync(&func->dev);
 		if (ret < 0)
 			goto out;

 		if (gpio_is_valid(wl->power_gpio))
 			gpio_set_value(wl->power_gpio, false);
 	}

 out:
 	return ret;
 }

 static struct wl1251_if_operations wl1251_sdio_ops = {
 	.read = wl1251_sdio_read,
 	.write = wl1251_sdio_write,
 	.write_elp = wl1251_sdio_write_elp,
 	.read_elp = wl1251_sdio_read_elp,
 	.reset = wl1251_sdio_reset,
 	.power = wl1251_sdio_set_power,
 };

 static int wl1251_sdio_probe(struct sdio_func *func,
 			     const struct sdio_device_id *id)
 {
 	int ret;
 	struct wl1251 *wl;
 	struct ieee80211_hw *hw;
 	struct wl1251_sdio *wl_sdio;
 	const struct wl1251_platform_data *wl1251_board_data;

 	hw = wl1251_alloc_hw();
 	if (IS_ERR(hw))
 		return PTR_ERR(hw);

 	wl = hw->priv;

 	wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
 	if (wl_sdio == NULL) {
 		ret = -ENOMEM;
 		goto out_free_hw;
 	}

 	sdio_claim_host(func);
 	ret = sdio_enable_func(func);
 	if (ret)
 		goto release;

 	sdio_set_block_size(func, 512);
 	sdio_release_host(func);

 	SET_IEEE80211_DEV(hw, &func->dev);
 	wl_sdio->func = func;
 	wl->if_priv = wl_sdio;
 	wl->if_ops = &wl1251_sdio_ops;

 	wl1251_board_data = wl1251_get_platform_data();
 	if (!IS_ERR(wl1251_board_data)) {
 		wl->power_gpio = wl1251_board_data->power_gpio;
 		wl->irq = wl1251_board_data->irq;
 		wl->use_eeprom = wl1251_board_data->use_eeprom;
 	}

 	if (gpio_is_valid(wl->power_gpio)) {
 		ret = devm_gpio_request(&func->dev, wl->power_gpio,
 								"wl1251 power");
 		if (ret) {
 			wl1251_error("Failed to request gpio: %d\n", ret);
 			goto disable;
 		}
 	}

 	if (wl->irq) {
 		irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
 		ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
 		if (ret < 0) {
 			wl1251_error("request_irq() failed: %d", ret);
 			goto disable;
 		}

 		irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

 		wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
 		wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;

 		wl1251_info("using dedicated interrupt line");
 	} else {
 		wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
 		wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;

 		wl1251_info("using SDIO interrupt");
 	}

 	ret = wl1251_init_ieee80211(wl);
 	if (ret)
 		goto out_free_irq;

 	sdio_set_drvdata(func, wl);

 	/* Tell PM core that we don't need the card to be powered now */
 	pm_runtime_put_noidle(&func->dev);

 	return ret;

 out_free_irq:
 	if (wl->irq)
 		free_irq(wl->irq, wl);
 disable:
 	sdio_claim_host(func);
 	sdio_disable_func(func);
 release:
 	sdio_release_host(func);
 	kfree(wl_sdio);
 out_free_hw:
 	wl1251_free_hw(wl);
 	return ret;
 }

 static void wl1251_sdio_remove(struct sdio_func *func)
 {
 	struct wl1251 *wl = sdio_get_drvdata(func);
 	struct wl1251_sdio *wl_sdio = wl->if_priv;

 	/* Undo decrement done above in wl1251_probe */
 	pm_runtime_get_noresume(&func->dev);

 	if (wl->irq)
 		free_irq(wl->irq, wl);
 	wl1251_free_hw(wl);
 	kfree(wl_sdio);

 	sdio_claim_host(func);
 	sdio_release_irq(func);
 	sdio_disable_func(func);
 	sdio_release_host(func);
 }

 static int wl1251_suspend(struct device *dev)
 {
 	/*
 	 * Tell MMC/SDIO core it's OK to power down the card
 	 * (if it isn't already), but not to remove it completely.
 	 */
 	return 0;
 }

 static int wl1251_resume(struct device *dev)
 {
 	return 0;
 }

 static const struct dev_pm_ops wl1251_sdio_pm_ops = {
 	.suspend        = wl1251_suspend,
 	.resume         = wl1251_resume,
 };

 static struct sdio_driver wl1251_sdio_driver = {
 	.name		= "wl1251_sdio",
 	.id_table	= wl1251_devices,
 	.probe		= wl1251_sdio_probe,
 	.remove		= wl1251_sdio_remove,
 	.drv.pm		= &wl1251_sdio_pm_ops,
 };

 static int __init wl1251_sdio_init(void)
 {
 	int err;

 	err = sdio_register_driver(&wl1251_sdio_driver);
 	if (err)
 		wl1251_error("failed to register sdio driver: %d", err);
 	return err;
 }

 static void __exit wl1251_sdio_exit(void)
 {
 	sdio_unregister_driver(&wl1251_sdio_driver);
 	wl1251_notice("unloaded");
 }

 module_init(wl1251_sdio_init);
 module_exit(wl1251_sdio_exit);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
	/*
	* wl12xx SDIO routines
	*
	* 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 St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	* Copyright (C) 2005 Texas Instruments Incorporated
	* Copyright (C) 2008 Google Inc
	* Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
	*/
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/mod_devicetable.h>
	#include <linux/mmc/sdio_func.h>
	#include <linux/mmc/sdio_ids.h>
	#include <linux/platform_device.h>
	#include <linux/wl12xx.h>
	#include <linux/irq.h>
	#include <linux/pm_runtime.h>
	#include <linux/gpio.h>

	#include "wl1251.h"

	#ifndef SDIO_VENDOR_ID_TI
	#define SDIO_VENDOR_ID_TI 0x104c
	#endif

	#ifndef SDIO_DEVICE_ID_TI_WL1251
	#define SDIO_DEVICE_ID_TI_WL1251 0x9066
	#endif

	struct wl1251_sdio {
	struct sdio_func *func;
	u32 elp_val;
	};

	static struct sdio_func wl_to_func(struct wl1251 wl)
	{
	struct wl1251_sdio *wl_sdio = wl->if_priv;
	return wl_sdio->func;
	}

	static void wl1251_sdio_interrupt(struct sdio_func *func)
	{
	struct wl1251 *wl = sdio_get_drvdata(func);

	wl1251_debug(DEBUG_IRQ, "IRQ");

	/* FIXME should be synchronous for sdio */
	ieee80211_queue_work(wl->hw, &wl->irq_work);
	}

	static const struct sdio_device_id wl1251_devices[] = {
	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
	{}
	};
	MODULE_DEVICE_TABLE(sdio, wl1251_devices);


	static void wl1251_sdio_read(struct wl1251 *wl, int addr,
	void *buf, size_t len)
	{
	int ret;
	struct sdio_func *func = wl_to_func(wl);

	sdio_claim_host(func);
	ret = sdio_memcpy_fromio(func, buf, addr, len);
	if (ret)
	wl1251_error("sdio read failed (%d)", ret);
	sdio_release_host(func);
	}

	static void wl1251_sdio_write(struct wl1251 *wl, int addr,
	void *buf, size_t len)
	{
	int ret;
	struct sdio_func *func = wl_to_func(wl);

	sdio_claim_host(func);
	ret = sdio_memcpy_toio(func, addr, buf, len);
	if (ret)
	wl1251_error("sdio write failed (%d)", ret);
	sdio_release_host(func);
	}

	static void wl1251_sdio_read_elp(struct wl1251 wl, int addr, u32 val)
	{
	int ret = 0;
	struct wl1251_sdio *wl_sdio = wl->if_priv;
	struct sdio_func *func = wl_sdio->func;

	/*
	* The hardware only supports RAW (read after write) access for
	* reading, regular sdio_readb won't work here (it interprets
	* the unused bits of CMD52 as write data even if we send read
	* request).
	*/
	sdio_claim_host(func);
	*val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
	sdio_release_host(func);

	if (ret)
	wl1251_error("sdio_readb failed (%d)", ret);
	}

	static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
	{
	int ret = 0;
	struct wl1251_sdio *wl_sdio = wl->if_priv;
	struct sdio_func *func = wl_sdio->func;

	sdio_claim_host(func);
	sdio_writeb(func, val, addr, &ret);
	sdio_release_host(func);

	if (ret)
	wl1251_error("sdio_writeb failed (%d)", ret);
	else
	wl_sdio->elp_val = val;
	}

	static void wl1251_sdio_reset(struct wl1251 *wl)
	{
	}

	static void wl1251_sdio_enable_irq(struct wl1251 *wl)
	{
	struct sdio_func *func = wl_to_func(wl);

	sdio_claim_host(func);
	sdio_claim_irq(func, wl1251_sdio_interrupt);
	sdio_release_host(func);
	}

	static void wl1251_sdio_disable_irq(struct wl1251 *wl)
	{
	struct sdio_func *func = wl_to_func(wl);

	sdio_claim_host(func);
	sdio_release_irq(func);
	sdio_release_host(func);
	}

	/* Interrupts when using dedicated WLAN_IRQ pin */
	static irqreturn_t wl1251_line_irq(int irq, void *cookie)
	{
	struct wl1251 *wl = cookie;

	ieee80211_queue_work(wl->hw, &wl->irq_work);

	return IRQ_HANDLED;
	}

	static void wl1251_enable_line_irq(struct wl1251 *wl)
	{
	return enable_irq(wl->irq);
	}

	static void wl1251_disable_line_irq(struct wl1251 *wl)
	{
	return disable_irq(wl->irq);
	}

	static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
	{
	struct sdio_func *func = wl_to_func(wl);
	int ret;

	if (enable) {
	/*
	* Power is controlled by runtime PM, but we still call board
	* callback in case it wants to do any additional setup,
	* for example enabling clock buffer for the module.
	*/
	if (gpio_is_valid(wl->power_gpio))
	gpio_set_value(wl->power_gpio, true);


	ret = pm_runtime_get_sync(&func->dev);
	if (ret < 0) {
	pm_runtime_put_sync(&func->dev);
	goto out;
	}

	sdio_claim_host(func);
	sdio_enable_func(func);
	sdio_release_host(func);
	} else {
	sdio_claim_host(func);
	sdio_disable_func(func);
	sdio_release_host(func);

	ret = pm_runtime_put_sync(&func->dev);
	if (ret < 0)
	goto out;

	if (gpio_is_valid(wl->power_gpio))
	gpio_set_value(wl->power_gpio, false);
	}

	out:
	return ret;
	}

	static struct wl1251_if_operations wl1251_sdio_ops = {
	.read = wl1251_sdio_read,
	.write = wl1251_sdio_write,
	.write_elp = wl1251_sdio_write_elp,
	.read_elp = wl1251_sdio_read_elp,
	.reset = wl1251_sdio_reset,
	.power = wl1251_sdio_set_power,
	};

	static int wl1251_sdio_probe(struct sdio_func *func,
	const struct sdio_device_id *id)
	{
	int ret;
	struct wl1251 *wl;
	struct ieee80211_hw *hw;
	struct wl1251_sdio *wl_sdio;
	const struct wl1251_platform_data *wl1251_board_data;

	hw = wl1251_alloc_hw();
	if (IS_ERR(hw))
	return PTR_ERR(hw);

	wl = hw->priv;

	wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
	if (wl_sdio == NULL) {
	ret = -ENOMEM;
	goto out_free_hw;
	}

	sdio_claim_host(func);
	ret = sdio_enable_func(func);
	if (ret)
	goto release;

	sdio_set_block_size(func, 512);
	sdio_release_host(func);

	SET_IEEE80211_DEV(hw, &func->dev);
	wl_sdio->func = func;
	wl->if_priv = wl_sdio;
	wl->if_ops = &wl1251_sdio_ops;

	wl1251_board_data = wl1251_get_platform_data();
	if (!IS_ERR(wl1251_board_data)) {
	wl->power_gpio = wl1251_board_data->power_gpio;
	wl->irq = wl1251_board_data->irq;
	wl->use_eeprom = wl1251_board_data->use_eeprom;
	}

	if (gpio_is_valid(wl->power_gpio)) {
	ret = devm_gpio_request(&func->dev, wl->power_gpio,
	"wl1251 power");
	if (ret) {
	wl1251_error("Failed to request gpio: %d\n", ret);
	goto disable;
	}
	}

	if (wl->irq) {
	irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
	ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
	if (ret < 0) {
	wl1251_error("request_irq() failed: %d", ret);
	goto disable;
	}

	irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

	wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
	wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;

	wl1251_info("using dedicated interrupt line");
	} else {
	wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
	wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;

	wl1251_info("using SDIO interrupt");
	}

	ret = wl1251_init_ieee80211(wl);
	if (ret)
	goto out_free_irq;

	sdio_set_drvdata(func, wl);

	/* Tell PM core that we don't need the card to be powered now */
	pm_runtime_put_noidle(&func->dev);

	return ret;

	out_free_irq:
	if (wl->irq)
	free_irq(wl->irq, wl);
	disable:
	sdio_claim_host(func);
	sdio_disable_func(func);
	release:
	sdio_release_host(func);
	kfree(wl_sdio);
	out_free_hw:
	wl1251_free_hw(wl);
	return ret;
	}

	static void wl1251_sdio_remove(struct sdio_func *func)
	{
	struct wl1251 *wl = sdio_get_drvdata(func);
	struct wl1251_sdio *wl_sdio = wl->if_priv;

	/* Undo decrement done above in wl1251_probe */
	pm_runtime_get_noresume(&func->dev);

	if (wl->irq)
	free_irq(wl->irq, wl);
	wl1251_free_hw(wl);
	kfree(wl_sdio);

	sdio_claim_host(func);
	sdio_release_irq(func);
	sdio_disable_func(func);
	sdio_release_host(func);
	}

	static int wl1251_suspend(struct device *dev)
	{
	/*
	* Tell MMC/SDIO core it's OK to power down the card
	* (if it isn't already), but not to remove it completely.
	*/
	return 0;
	}

	static int wl1251_resume(struct device *dev)
	{
	return 0;
	}

	static const struct dev_pm_ops wl1251_sdio_pm_ops = {
	.suspend = wl1251_suspend,
	.resume = wl1251_resume,
	};

	static struct sdio_driver wl1251_sdio_driver = {
	.name = "wl1251_sdio",
	.id_table = wl1251_devices,
	.probe = wl1251_sdio_probe,
	.remove = wl1251_sdio_remove,
	.drv.pm = &wl1251_sdio_pm_ops,
	};

	static int __init wl1251_sdio_init(void)
	{
	int err;

	err = sdio_register_driver(&wl1251_sdio_driver);
	if (err)
	wl1251_error("failed to register sdio driver: %d", err);
	return err;
	}

	static void __exit wl1251_sdio_exit(void)
	{
	sdio_unregister_driver(&wl1251_sdio_driver);
	wl1251_notice("unloaded");
	}

	module_init(wl1251_sdio_init);
	module_exit(wl1251_sdio_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");