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linux/drivers/net/wireless/ti/wl1251/spi.c

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/*
* 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");
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