spi.c

/*
 * 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/crc7.h>
#include <linux/spi/spi.h>
#include <linux/wl12xx.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)
{
	u8 crc[WSPI_INIT_CMD_CRC_LEN], *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 init");
		return;
	}

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

	/*
	 * Set WSPI_INIT_COMMAND
	 * the data is being send from the MSB to LSB
	 */
	cmd[2] = 0xff;
	cmd[3] = 0xff;
	cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
	cmd[0] = 0;
	cmd[7] = 0;
	cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
	cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;

	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
		cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;
	else
		cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;

	cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;

	crc[0] = cmd[1];
	crc[1] = cmd[0];
	crc[2] = cmd[7];
	crc[3] = cmd[6];
	crc[4] = cmd[5];

	cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
	cmd[4] |= WSPI_INIT_CMD_END;

	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 (wl->set_power)
		wl->set_power(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 wl12xx_platform_data *pdata;
	struct ieee80211_hw *hw;
	struct wl1251 *wl;
	int ret;

	pdata = spi->dev.platform_data;
	if (!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;
	}

	wl->set_power = pdata->set_power;
	if (!wl->set_power) {
		wl1251_error("set power function missing in platform data");
		return -ENODEV;
	}

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

	wl->use_eeprom = pdata->use_eeprom;

	irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
	ret = request_irq(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);

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

	return 0;

 out_irq:
	free_irq(wl->irq, wl);

 out_free:
	ieee80211_free_hw(hw);

	return ret;
}

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

	free_irq(wl->irq, wl);
	wl1251_free_hw(wl);

	return 0;
}

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

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

static int __init wl1251_spi_init(void)
{
	int ret;

	ret = spi_register_driver(&wl1251_spi_driver);
	if (ret < 0) {
		wl1251_error("failed to register spi driver: %d", ret);
		goto out;
	}

out:
	return ret;
}

static void __exit wl1251_spi_exit(void)
{
	spi_unregister_driver(&wl1251_spi_driver);

	wl1251_notice("unloaded");
}

module_init(wl1251_spi_init);
module_exit(wl1251_spi_exit);

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