drivers/net/wireless/ti/wl1251/spi.c - vendor/opensource/backports - Git at Google

 /*
  * This file is part of wl1251
  *
  * Copyright (C) 2008 Nokia Corporation
  *
  * 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
  *
  */

 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/swab.h>
 #include <linux/crc7.h>
 #include <linux/spi/spi.h>
 #include <linux/wl12xx.h>
 #include <linux/gpio.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/regulator/consumer.h>

 #include "wl1251.h"
 #include "reg.h"
 #include "spi.h"

 static irqreturn_t wl1251_irq(int irq, void *cookie)
 {
 	struct wl1251 *wl;

 	wl1251_debug(DEBUG_IRQ, "IRQ");

 	wl = cookie;

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

 	return IRQ_HANDLED;
 }

 static struct spi_device *wl_to_spi(struct wl1251 *wl)
 {
 	return wl->if_priv;
 }

 static void wl1251_spi_reset(struct wl1251 *wl)
 {
 	u8 *cmd;
 	struct spi_transfer t;
 	struct spi_message m;

 	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
 	if (!cmd) {
 		wl1251_error("could not allocate cmd for spi reset");
 		return;
 	}

 	memset(&t, 0, sizeof(t));
 	spi_message_init(&m);

 	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);

 	t.tx_buf = cmd;
 	t.len = WSPI_INIT_CMD_LEN;
 	spi_message_add_tail(&t, &m);

 	spi_sync(wl_to_spi(wl), &m);

 	wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);

 	kfree(cmd);
 }

 static void wl1251_spi_wake(struct wl1251 *wl)
 {
 	struct spi_transfer t;
 	struct spi_message m;
 	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);

 	if (!cmd) {
 		wl1251_error("could not allocate cmd for spi init");
 		return;
 	}

 	memset(&t, 0, sizeof(t));
 	spi_message_init(&m);

 	/* Set WSPI_INIT_COMMAND
 	 * the data is being send from the MSB to LSB
 	 */
 	cmd[0] = 0xff;
 	cmd[1] = 0xff;
 	cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
 	cmd[3] = 0;
 	cmd[4] = 0;
 	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
 	cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;

 	cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
 		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;

 	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
 		cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
 	else
 		cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;

 	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
 	/*
 	 * The above is the logical order; it must actually be stored
 	 * in the buffer byte-swapped.
 	 */
 	__swab32s((u32 *)cmd);
 	__swab32s((u32 *)cmd+1);

 	t.tx_buf = cmd;
 	t.len = WSPI_INIT_CMD_LEN;
 	spi_message_add_tail(&t, &m);

 	spi_sync(wl_to_spi(wl), &m);

 	wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);

 	kfree(cmd);
 }

 static void wl1251_spi_reset_wake(struct wl1251 *wl)
 {
 	wl1251_spi_reset(wl);
 	wl1251_spi_wake(wl);
 }

 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
 			    size_t len)
 {
 	struct spi_transfer t[3];
 	struct spi_message m;
 	u8 *busy_buf;
 	u32 *cmd;

 	cmd = &wl->buffer_cmd;
 	busy_buf = wl->buffer_busyword;

 	*cmd = 0;
 	*cmd |= WSPI_CMD_READ;
 	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
 	*cmd |= addr & WSPI_CMD_BYTE_ADDR;

 	spi_message_init(&m);
 	memset(t, 0, sizeof(t));

 	t[0].tx_buf = cmd;
 	t[0].len = 4;
 	spi_message_add_tail(&t[0], &m);

 	/* Busy and non busy words read */
 	t[1].rx_buf = busy_buf;
 	t[1].len = WL1251_BUSY_WORD_LEN;
 	spi_message_add_tail(&t[1], &m);

 	t[2].rx_buf = buf;
 	t[2].len = len;
 	spi_message_add_tail(&t[2], &m);

 	spi_sync(wl_to_spi(wl), &m);

 	/* FIXME: check busy words */

 	wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
 	wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
 }

 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
 			     size_t len)
 {
 	struct spi_transfer t[2];
 	struct spi_message m;
 	u32 *cmd;

 	cmd = &wl->buffer_cmd;

 	*cmd = 0;
 	*cmd |= WSPI_CMD_WRITE;
 	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
 	*cmd |= addr & WSPI_CMD_BYTE_ADDR;

 	spi_message_init(&m);
 	memset(t, 0, sizeof(t));

 	t[0].tx_buf = cmd;
 	t[0].len = sizeof(*cmd);
 	spi_message_add_tail(&t[0], &m);

 	t[1].tx_buf = buf;
 	t[1].len = len;
 	spi_message_add_tail(&t[1], &m);

 	spi_sync(wl_to_spi(wl), &m);

 	wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
 	wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
 }

 static void wl1251_spi_enable_irq(struct wl1251 *wl)
 {
 	return enable_irq(wl->irq);
 }

 static void wl1251_spi_disable_irq(struct wl1251 *wl)
 {
 	return disable_irq(wl->irq);
 }

 static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
 {
 	if (gpio_is_valid(wl->power_gpio))
 		gpio_set_value(wl->power_gpio, enable);

 	return 0;
 }

 static const struct wl1251_if_operations wl1251_spi_ops = {
 	.read = wl1251_spi_read,
 	.write = wl1251_spi_write,
 	.reset = wl1251_spi_reset_wake,
 	.enable_irq = wl1251_spi_enable_irq,
 	.disable_irq = wl1251_spi_disable_irq,
 	.power = wl1251_spi_set_power,
 };

 static int wl1251_spi_probe(struct spi_device *spi)
 {
 	struct wl1251_platform_data *pdata = dev_get_platdata(&spi->dev);
 	struct device_node *np = spi->dev.of_node;
 	struct ieee80211_hw *hw;
 	struct wl1251 *wl;
 	int ret;

 	if (!np && !pdata) {
 		wl1251_error("no platform data");
 		return -ENODEV;
 	}

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

 	wl = hw->priv;

 	SET_IEEE80211_DEV(hw, &spi->dev);
 	spi_set_drvdata(spi, wl);
 	wl->if_priv = spi;
 	wl->if_ops = &wl1251_spi_ops;

 	/* This is the only SPI value that we need to set here, the rest
 	 * comes from the board-peripherals file
 	 */
 	spi->bits_per_word = 32;

 	ret = spi_setup(spi);
 	if (ret < 0) {
 		wl1251_error("spi_setup failed");
 		goto out_free;
 	}

 	if (np) {
 		wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
 		wl->power_gpio = of_get_named_gpio(np, "ti,power-gpio", 0);
 	} else if (pdata) {
 		wl->power_gpio = pdata->power_gpio;
 		wl->use_eeprom = pdata->use_eeprom;
 	}

 	if (wl->power_gpio == -EPROBE_DEFER) {
 		ret = -EPROBE_DEFER;
 		goto out_free;
 	}

 	if (gpio_is_valid(wl->power_gpio)) {
 		ret = devm_gpio_request_one(&spi->dev, wl->power_gpio,
 					GPIOF_OUT_INIT_LOW, "wl1251 power");
 		if (ret) {
 			wl1251_error("Failed to request gpio: %d\n", ret);
 			goto out_free;
 		}
 	} else {
 		wl1251_error("set power gpio missing in platform data");
 		ret = -ENODEV;
 		goto out_free;
 	}

 	wl->irq = spi->irq;
 	if (wl->irq < 0) {
 		wl1251_error("irq missing in platform data");
 		ret = -ENODEV;
 		goto out_free;
 	}

 	irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
 	ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
 							DRIVER_NAME, wl);
 	if (ret < 0) {
 		wl1251_error("request_irq() failed: %d", ret);
 		goto out_free;
 	}

 	irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

 	wl->vio = devm_regulator_get(&spi->dev, "vio");
 	if (IS_ERR(wl->vio)) {
 		ret = PTR_ERR(wl->vio);
 		wl1251_error("vio regulator missing: %d", ret);
 		goto out_free;
 	}

 	ret = regulator_enable(wl->vio);
 	if (ret)
 		goto out_free;

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

 	return 0;

 disable_regulator:
 	regulator_disable(wl->vio);
 out_free:
 	ieee80211_free_hw(hw);

 	return ret;
 }

 static int wl1251_spi_remove(struct spi_device *spi)
 {
 	struct wl1251 *wl = spi_get_drvdata(spi);

 	wl1251_free_hw(wl);
 	regulator_disable(wl->vio);

 	return 0;
 }

 static struct spi_driver wl1251_spi_driver = {
 	.driver = {
 		.name		= DRIVER_NAME,
 	},

 	.probe		= wl1251_spi_probe,
 	.remove		= wl1251_spi_remove,
 };

 module_spi_driver(wl1251_spi_driver);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
 MODULE_ALIAS("spi:wl1251");
	/*
	* This file is part of wl1251
	*
	* Copyright (C) 2008 Nokia Corporation
	*
	* 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
	*
	*/

	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/swab.h>
	#include <linux/crc7.h>
	#include <linux/spi/spi.h>
	#include <linux/wl12xx.h>
	#include <linux/gpio.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/regulator/consumer.h>

	#include "wl1251.h"
	#include "reg.h"
	#include "spi.h"

	static irqreturn_t wl1251_irq(int irq, void *cookie)
	{
	struct wl1251 *wl;

	wl1251_debug(DEBUG_IRQ, "IRQ");

	wl = cookie;

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

	return IRQ_HANDLED;
	}

	static struct spi_device wl_to_spi(struct wl1251 wl)
	{
	return wl->if_priv;
	}

	static void wl1251_spi_reset(struct wl1251 *wl)
	{
	u8 *cmd;
	struct spi_transfer t;
	struct spi_message m;

	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	if (!cmd) {
	wl1251_error("could not allocate cmd for spi reset");
	return;
	}

	memset(&t, 0, sizeof(t));
	spi_message_init(&m);

	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);

	t.tx_buf = cmd;
	t.len = WSPI_INIT_CMD_LEN;
	spi_message_add_tail(&t, &m);

	spi_sync(wl_to_spi(wl), &m);

	wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);

	kfree(cmd);
	}

	static void wl1251_spi_wake(struct wl1251 *wl)
	{
	struct spi_transfer t;
	struct spi_message m;
	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);

	if (!cmd) {
	wl1251_error("could not allocate cmd for spi init");
	return;
	}

	memset(&t, 0, sizeof(t));
	spi_message_init(&m);

	/* Set WSPI_INIT_COMMAND
	* the data is being send from the MSB to LSB
	*/
	cmd[0] = 0xff;
	cmd[1] = 0xff;
	cmd[2] = WSPI_INIT_CMD_START \| WSPI_INIT_CMD_TX;
	cmd[3] = 0;
	cmd[4] = 0;
	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
	cmd[5] \|= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;

	cmd[6] = WSPI_INIT_CMD_IOD \| WSPI_INIT_CMD_IP \| WSPI_INIT_CMD_CS
	\| WSPI_INIT_CMD_WSPI \| WSPI_INIT_CMD_WS;

	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
	cmd[6] \|= WSPI_INIT_CMD_DIS_FIXEDBUSY;
	else
	cmd[6] \|= WSPI_INIT_CMD_EN_FIXEDBUSY;

	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) \| WSPI_INIT_CMD_END;
	/*
	* The above is the logical order; it must actually be stored
	* in the buffer byte-swapped.
	*/
	__swab32s((u32 *)cmd);
	__swab32s((u32 *)cmd+1);

	t.tx_buf = cmd;
	t.len = WSPI_INIT_CMD_LEN;
	spi_message_add_tail(&t, &m);

	spi_sync(wl_to_spi(wl), &m);

	wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);

	kfree(cmd);
	}

	static void wl1251_spi_reset_wake(struct wl1251 *wl)
	{
	wl1251_spi_reset(wl);
	wl1251_spi_wake(wl);
	}

	static void wl1251_spi_read(struct wl1251 wl, int addr, void buf,
	size_t len)
	{
	struct spi_transfer t[3];
	struct spi_message m;
	u8 *busy_buf;
	u32 *cmd;

	cmd = &wl->buffer_cmd;
	busy_buf = wl->buffer_busyword;

	*cmd = 0;
	*cmd \|= WSPI_CMD_READ;
	*cmd \|= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	*cmd \|= addr & WSPI_CMD_BYTE_ADDR;

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = cmd;
	t[0].len = 4;
	spi_message_add_tail(&t[0], &m);

	/* Busy and non busy words read */
	t[1].rx_buf = busy_buf;
	t[1].len = WL1251_BUSY_WORD_LEN;
	spi_message_add_tail(&t[1], &m);

	t[2].rx_buf = buf;
	t[2].len = len;
	spi_message_add_tail(&t[2], &m);

	spi_sync(wl_to_spi(wl), &m);

	/* FIXME: check busy words */

	wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
	wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
	}

	static void wl1251_spi_write(struct wl1251 wl, int addr, void buf,
	size_t len)
	{
	struct spi_transfer t[2];
	struct spi_message m;
	u32 *cmd;

	cmd = &wl->buffer_cmd;

	*cmd = 0;
	*cmd \|= WSPI_CMD_WRITE;
	*cmd \|= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	*cmd \|= addr & WSPI_CMD_BYTE_ADDR;

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = cmd;
	t[0].len = sizeof(*cmd);
	spi_message_add_tail(&t[0], &m);

	t[1].tx_buf = buf;
	t[1].len = len;
	spi_message_add_tail(&t[1], &m);

	spi_sync(wl_to_spi(wl), &m);

	wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
	wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
	}

	static void wl1251_spi_enable_irq(struct wl1251 *wl)
	{
	return enable_irq(wl->irq);
	}

	static void wl1251_spi_disable_irq(struct wl1251 *wl)
	{
	return disable_irq(wl->irq);
	}

	static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
	{
	if (gpio_is_valid(wl->power_gpio))
	gpio_set_value(wl->power_gpio, enable);

	return 0;
	}

	static const struct wl1251_if_operations wl1251_spi_ops = {
	.read = wl1251_spi_read,
	.write = wl1251_spi_write,
	.reset = wl1251_spi_reset_wake,
	.enable_irq = wl1251_spi_enable_irq,
	.disable_irq = wl1251_spi_disable_irq,
	.power = wl1251_spi_set_power,
	};

	static int wl1251_spi_probe(struct spi_device *spi)
	{
	struct wl1251_platform_data *pdata = dev_get_platdata(&spi->dev);
	struct device_node *np = spi->dev.of_node;
	struct ieee80211_hw *hw;
	struct wl1251 *wl;
	int ret;

	if (!np && !pdata) {
	wl1251_error("no platform data");
	return -ENODEV;
	}

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

	wl = hw->priv;

	SET_IEEE80211_DEV(hw, &spi->dev);
	spi_set_drvdata(spi, wl);
	wl->if_priv = spi;
	wl->if_ops = &wl1251_spi_ops;

	/* This is the only SPI value that we need to set here, the rest
	* comes from the board-peripherals file
	*/
	spi->bits_per_word = 32;

	ret = spi_setup(spi);
	if (ret < 0) {
	wl1251_error("spi_setup failed");
	goto out_free;
	}

	if (np) {
	wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
	wl->power_gpio = of_get_named_gpio(np, "ti,power-gpio", 0);
	} else if (pdata) {
	wl->power_gpio = pdata->power_gpio;
	wl->use_eeprom = pdata->use_eeprom;
	}

	if (wl->power_gpio == -EPROBE_DEFER) {
	ret = -EPROBE_DEFER;
	goto out_free;
	}

	if (gpio_is_valid(wl->power_gpio)) {
	ret = devm_gpio_request_one(&spi->dev, wl->power_gpio,
	GPIOF_OUT_INIT_LOW, "wl1251 power");
	if (ret) {
	wl1251_error("Failed to request gpio: %d\n", ret);
	goto out_free;
	}
	} else {
	wl1251_error("set power gpio missing in platform data");
	ret = -ENODEV;
	goto out_free;
	}

	wl->irq = spi->irq;
	if (wl->irq < 0) {
	wl1251_error("irq missing in platform data");
	ret = -ENODEV;
	goto out_free;
	}

	irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
	ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
	DRIVER_NAME, wl);
	if (ret < 0) {
	wl1251_error("request_irq() failed: %d", ret);
	goto out_free;
	}

	irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

	wl->vio = devm_regulator_get(&spi->dev, "vio");
	if (IS_ERR(wl->vio)) {
	ret = PTR_ERR(wl->vio);
	wl1251_error("vio regulator missing: %d", ret);
	goto out_free;
	}

	ret = regulator_enable(wl->vio);
	if (ret)
	goto out_free;

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

	return 0;

	disable_regulator:
	regulator_disable(wl->vio);
	out_free:
	ieee80211_free_hw(hw);

	return ret;
	}

	static int wl1251_spi_remove(struct spi_device *spi)
	{
	struct wl1251 *wl = spi_get_drvdata(spi);

	wl1251_free_hw(wl);
	regulator_disable(wl->vio);

	return 0;
	}

	static struct spi_driver wl1251_spi_driver = {
	.driver = {
	.name = DRIVER_NAME,
	},

	.probe = wl1251_spi_probe,
	.remove = wl1251_spi_remove,
	};

	module_spi_driver(wl1251_spi_driver);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
	MODULE_ALIAS("spi:wl1251");