[deliverable/linux.git] / drivers / net / wireless / wl12xx / wl1271_spi.c

/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.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 St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/irq.h>
#include <linux/module.h>
#include <linux/crc7.h>
#include <linux/spi/spi.h>
#include <linux/spi/wl12xx.h>

#include "wl1271.h"
#include "wl12xx_80211.h"
#include "wl1271_io.h"

#include "wl1271_reg.h"

#define WSPI_CMD_READ                 0x40000000
#define WSPI_CMD_WRITE                0x00000000
#define WSPI_CMD_FIXED                0x20000000
#define WSPI_CMD_BYTE_LENGTH          0x1FFE0000
#define WSPI_CMD_BYTE_LENGTH_OFFSET   17
#define WSPI_CMD_BYTE_ADDR            0x0001FFFF

#define WSPI_INIT_CMD_CRC_LEN       5

#define WSPI_INIT_CMD_START         0x00
#define WSPI_INIT_CMD_TX            0x40
/* the extra bypass bit is sampled by the TNET as '1' */
#define WSPI_INIT_CMD_BYPASS_BIT    0x80
#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
#define WSPI_INIT_CMD_EN_FIXEDBUSY  0x80
#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
#define WSPI_INIT_CMD_IOD           0x40
#define WSPI_INIT_CMD_IP            0x20
#define WSPI_INIT_CMD_CS            0x10
#define WSPI_INIT_CMD_WS            0x08
#define WSPI_INIT_CMD_WSPI          0x01
#define WSPI_INIT_CMD_END           0x01

#define WSPI_INIT_CMD_LEN           8

#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
		((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
#define HW_ACCESS_WSPI_INIT_CMD_MASK  0

static inline struct spi_device *wl_to_spi(struct wl1271 *wl)
{
	return wl->if_priv;
}

static struct device *wl1271_spi_wl_to_dev(struct wl1271 *wl)
{
	return &(wl_to_spi(wl)->dev);
}

static void wl1271_spi_disable_interrupts(struct wl1271 *wl)
{
	disable_irq(wl->irq);
}

static void wl1271_spi_enable_interrupts(struct wl1271 *wl)
{
	enable_irq(wl->irq);
}

static void wl1271_spi_reset(struct wl1271 *wl)
{
	u8 *cmd;
	struct spi_transfer t;
	struct spi_message m;

	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	if (!cmd) {
		wl1271_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);

	wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
}

static void wl1271_spi_init(struct wl1271 *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) {
		wl1271_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);

	wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
}

#define WL1271_BUSY_WORD_TIMEOUT 1000

/* FIXME: Check busy words, removed due to SPI bug */
#if 0
static void wl1271_spi_read_busy(struct wl1271 *wl, void *buf, size_t len)
{
	struct spi_transfer t[1];
	struct spi_message m;
	u32 *busy_buf;
	int num_busy_bytes = 0;

	wl1271_info("spi read BUSY!");

	/*
	 * Look for the non-busy word in the read buffer, and if found,
	 * read in the remaining data into the buffer.
	 */
	busy_buf = (u32 *)buf;
	for (; (u32)busy_buf < (u32)buf + len; busy_buf++) {
		num_busy_bytes += sizeof(u32);
		if (*busy_buf & 0x1) {
			spi_message_init(&m);
			memset(t, 0, sizeof(t));
			memmove(buf, busy_buf, len - num_busy_bytes);
			t[0].rx_buf = buf + (len - num_busy_bytes);
			t[0].len = num_busy_bytes;
			spi_message_add_tail(&t[0], &m);
			spi_sync(wl_to_spi(wl), &m);
			return;
		}
	}

	/*
	 * Read further busy words from SPI until a non-busy word is
	 * encountered, then read the data itself into the buffer.
	 */
	wl1271_info("spi read BUSY-polling needed!");

	num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
	busy_buf = wl->buffer_busyword;
	while (num_busy_bytes) {
		num_busy_bytes--;
		spi_message_init(&m);
		memset(t, 0, sizeof(t));
		t[0].rx_buf = busy_buf;
		t[0].len = sizeof(u32);
		spi_message_add_tail(&t[0], &m);
		spi_sync(wl_to_spi(wl), &m);

		if (*busy_buf & 0x1) {
			spi_message_init(&m);
			memset(t, 0, sizeof(t));
			t[0].rx_buf = buf;
			t[0].len = len;
			spi_message_add_tail(&t[0], &m);
			spi_sync(wl_to_spi(wl), &m);
			return;
		}
	}

	/* The SPI bus is unresponsive, the read failed. */
	memset(buf, 0, len);
	wl1271_error("SPI read busy-word timeout!\n");
}
#endif

static void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf,
			 size_t len, bool fixed)
{
	struct spi_transfer t[3];
	struct spi_message m;
	u32 *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;

	if (fixed)
		*cmd |= WSPI_CMD_FIXED;

	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 = WL1271_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, removed due to SPI bug */
	/* if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1))
	   wl1271_spi_read_busy(wl, buf, len); */

	wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
	wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
}

static void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf,
			  size_t len, bool fixed)
{
	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;

	if (fixed)
		*cmd |= WSPI_CMD_FIXED;

	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);

	wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
	wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
}

static irqreturn_t wl1271_irq(int irq, void *cookie)
{
	struct wl1271 *wl;
	unsigned long flags;

	wl1271_debug(DEBUG_IRQ, "IRQ");

	wl = cookie;

	/* complete the ELP completion */
	spin_lock_irqsave(&wl->wl_lock, flags);
	if (wl->elp_compl) {
		complete(wl->elp_compl);
		wl->elp_compl = NULL;
	}

	if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
		ieee80211_queue_work(wl->hw, &wl->irq_work);
	set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags);
	spin_unlock_irqrestore(&wl->wl_lock, flags);

	return IRQ_HANDLED;
}

static void wl1271_spi_set_power(struct wl1271 *wl, bool enable)
{
	if (wl->set_power)
		wl->set_power(enable);
}

static struct wl1271_if_operations spi_ops = {
	.read		= wl1271_spi_raw_read,
	.write		= wl1271_spi_raw_write,
	.reset		= wl1271_spi_reset,
	.init		= wl1271_spi_init,
	.power		= wl1271_spi_set_power,
	.dev		= wl1271_spi_wl_to_dev,
	.enable_irq	= wl1271_spi_enable_interrupts,
	.disable_irq	= wl1271_spi_disable_interrupts
};

static int __devinit wl1271_probe(struct spi_device *spi)
{
	struct wl12xx_platform_data *pdata;
	struct ieee80211_hw *hw;
	struct wl1271 *wl;
	int ret;

	pdata = spi->dev.platform_data;
	if (!pdata) {
		wl1271_error("no platform data");
		return -ENODEV;
	}

	hw = wl1271_alloc_hw();
	if (IS_ERR(hw))
		return PTR_ERR(hw);

	wl = hw->priv;

	dev_set_drvdata(&spi->dev, wl);
	wl->if_priv = spi;

	wl->if_ops = &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) {
		wl1271_error("spi_setup failed");
		goto out_free;
	}

	wl->set_power = pdata->set_power;
	if (!wl->set_power) {
		wl1271_error("set power function missing in platform data");
		ret = -ENODEV;
		goto out_free;
	}

	wl->irq = spi->irq;
	if (wl->irq < 0) {
		wl1271_error("irq missing in platform data");
		ret = -ENODEV;
		goto out_free;
	}

	ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
	if (ret < 0) {
		wl1271_error("request_irq() failed: %d", ret);
		goto out_free;
	}

	set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);

	disable_irq(wl->irq);

	ret = wl1271_init_ieee80211(wl);
	if (ret)
		goto out_irq;

	ret = wl1271_register_hw(wl);
	if (ret)
		goto out_irq;

	wl1271_notice("initialized");

	return 0;

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

 out_free:
	wl1271_free_hw(wl);

	return ret;
}

static int __devexit wl1271_remove(struct spi_device *spi)
{
	struct wl1271 *wl = dev_get_drvdata(&spi->dev);

	free_irq(wl->irq, wl);

	wl1271_unregister_hw(wl);
	wl1271_free_hw(wl);

	return 0;
}


static struct spi_driver wl1271_spi_driver = {
	.driver = {
		.name		= "wl1271",
		.bus		= &spi_bus_type,
		.owner		= THIS_MODULE,
	},

	.probe		= wl1271_probe,
	.remove		= __devexit_p(wl1271_remove),
};

static int __init wl1271_init(void)
{
	int ret;

	ret = spi_register_driver(&wl1271_spi_driver);
	if (ret < 0) {
		wl1271_error("failed to register spi driver: %d", ret);
		goto out;
	}

out:
	return ret;
}

static void __exit wl1271_exit(void)
{
	spi_unregister_driver(&wl1271_spi_driver);

	wl1271_notice("unloaded");
}

module_init(wl1271_init);
module_exit(wl1271_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
MODULE_FIRMWARE(WL1271_FW_NAME);
Commit	Line	Data
f5fc0f86 LC	1	/*
	2	* This file is part of wl1271
	3	*
	4	* Copyright (C) 2008-2009 Nokia Corporation
	5	*
	6	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
2d5e82b8	24	#include <linux/irq.h>
f5fc0f86	25	#include <linux/module.h>
f5fc0f86 LC	26	#include <linux/crc7.h>
f5fc0f86 LC	27	#include <linux/spi/spi.h>
2d5e82b8	28	#include <linux/spi/wl12xx.h>
f5fc0f86 LC	29
	30	#include "wl1271.h"
	31	#include "wl12xx_80211.h"
2d5e82b8	32	#include "wl1271_io.h"
f5fc0f86	33
760d969f TP	34	#include "wl1271_reg.h"
	35
	36	#define WSPI_CMD_READ 0x40000000
	37	#define WSPI_CMD_WRITE 0x00000000
	38	#define WSPI_CMD_FIXED 0x20000000
	39	#define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
	40	#define WSPI_CMD_BYTE_LENGTH_OFFSET 17
	41	#define WSPI_CMD_BYTE_ADDR 0x0001FFFF
	42
	43	#define WSPI_INIT_CMD_CRC_LEN 5
	44
	45	#define WSPI_INIT_CMD_START 0x00
	46	#define WSPI_INIT_CMD_TX 0x40
	47	/* the extra bypass bit is sampled by the TNET as '1' */
	48	#define WSPI_INIT_CMD_BYPASS_BIT 0x80
	49	#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
	50	#define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
	51	#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
	52	#define WSPI_INIT_CMD_IOD 0x40
	53	#define WSPI_INIT_CMD_IP 0x20
	54	#define WSPI_INIT_CMD_CS 0x10
	55	#define WSPI_INIT_CMD_WS 0x08
	56	#define WSPI_INIT_CMD_WSPI 0x01
	57	#define WSPI_INIT_CMD_END 0x01
	58
	59	#define WSPI_INIT_CMD_LEN 8
	60
	61	#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
	62	((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
	63	#define HW_ACCESS_WSPI_INIT_CMD_MASK 0
	64
b42f91ba	65	static inline struct spi_device wl_to_spi(struct wl1271 wl)
8197b711 TP	66	{
	67	return wl->if_priv;
	68	}
	69
	70	static struct device wl1271_spi_wl_to_dev(struct wl1271 wl)
	71	{
	72	return &(wl_to_spi(wl)->dev);
	73	}
f5fc0f86	74
760d969f	75	static void wl1271_spi_disable_interrupts(struct wl1271 *wl)
54f7e503 TP	76	{
	77	disable_irq(wl->irq);
	78	}
	79
760d969f	80	static void wl1271_spi_enable_interrupts(struct wl1271 *wl)
54f7e503 TP	81	{
	82	enable_irq(wl->irq);
	83	}
	84
760d969f	85	static void wl1271_spi_reset(struct wl1271 *wl)
f5fc0f86 LC	86	{
	87	u8 *cmd;
	88	struct spi_transfer t;
	89	struct spi_message m;
	90
	91	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	92	if (!cmd) {
	93	wl1271_error("could not allocate cmd for spi reset");
	94	return;
	95	}
	96
	97	memset(&t, 0, sizeof(t));
	98	spi_message_init(&m);
	99
	100	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
	101
	102	t.tx_buf = cmd;
	103	t.len = WSPI_INIT_CMD_LEN;
	104	spi_message_add_tail(&t, &m);
	105
8197b711	106	spi_sync(wl_to_spi(wl), &m);
f5fc0f86 LC	107
	108	wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
	109	}
	110
760d969f	111	static void wl1271_spi_init(struct wl1271 *wl)
f5fc0f86 LC	112	{
	113	u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
	114	struct spi_transfer t;
	115	struct spi_message m;
	116
	117	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	118	if (!cmd) {
	119	wl1271_error("could not allocate cmd for spi init");
	120	return;
	121	}
	122
	123	memset(crc, 0, sizeof(crc));
	124	memset(&t, 0, sizeof(t));
	125	spi_message_init(&m);
	126
	127	/*
	128	* Set WSPI_INIT_COMMAND
	129	* the data is being send from the MSB to LSB
	130	*/
	131	cmd[2] = 0xff;
	132	cmd[3] = 0xff;
	133	cmd[1] = WSPI_INIT_CMD_START \| WSPI_INIT_CMD_TX;
	134	cmd[0] = 0;
	135	cmd[7] = 0;
	136	cmd[6] \|= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
	137	cmd[6] \|= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
	138
	139	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
	140	cmd[5] \|= WSPI_INIT_CMD_DIS_FIXEDBUSY;
	141	else
	142	cmd[5] \|= WSPI_INIT_CMD_EN_FIXEDBUSY;
	143
	144	cmd[5] \|= WSPI_INIT_CMD_IOD \| WSPI_INIT_CMD_IP \| WSPI_INIT_CMD_CS
	145	\| WSPI_INIT_CMD_WSPI \| WSPI_INIT_CMD_WS;
	146
	147	crc[0] = cmd[1];
	148	crc[1] = cmd[0];
	149	crc[2] = cmd[7];
	150	crc[3] = cmd[6];
	151	crc[4] = cmd[5];
	152
	153	cmd[4] \|= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
	154	cmd[4] \|= WSPI_INIT_CMD_END;
	155
	156	t.tx_buf = cmd;
	157	t.len = WSPI_INIT_CMD_LEN;
	158	spi_message_add_tail(&t, &m);
	159
8197b711	160	spi_sync(wl_to_spi(wl), &m);
f5fc0f86 LC	161
	162	wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
	163	}
	164
545f1da8 JO	165	#define WL1271_BUSY_WORD_TIMEOUT 1000
545f1da8 JO	166
938e30c9 LC	167	/* FIXME: Check busy words, removed due to SPI bug */
	168	#if 0
	169	static void wl1271_spi_read_busy(struct wl1271 wl, void buf, size_t len)
545f1da8 JO	170	{
	171	struct spi_transfer t[1];
	172	struct spi_message m;
	173	u32 *busy_buf;
	174	int num_busy_bytes = 0;
	175
	176	wl1271_info("spi read BUSY!");
	177
	178	/*
	179	* Look for the non-busy word in the read buffer, and if found,
	180	* read in the remaining data into the buffer.
	181	*/
	182	busy_buf = (u32 *)buf;
	183	for (; (u32)busy_buf < (u32)buf + len; busy_buf++) {
	184	num_busy_bytes += sizeof(u32);
	185	if (*busy_buf & 0x1) {
	186	spi_message_init(&m);
	187	memset(t, 0, sizeof(t));
	188	memmove(buf, busy_buf, len - num_busy_bytes);
	189	t[0].rx_buf = buf + (len - num_busy_bytes);
	190	t[0].len = num_busy_bytes;
	191	spi_message_add_tail(&t[0], &m);
8197b711	192	spi_sync(wl_to_spi(wl), &m);
545f1da8 JO	193	return;
	194	}
	195	}
	196
	197	/*
	198	* Read further busy words from SPI until a non-busy word is
	199	* encountered, then read the data itself into the buffer.
	200	*/
	201	wl1271_info("spi read BUSY-polling needed!");
	202
	203	num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
	204	busy_buf = wl->buffer_busyword;
	205	while (num_busy_bytes) {
	206	num_busy_bytes--;
	207	spi_message_init(&m);
	208	memset(t, 0, sizeof(t));
	209	t[0].rx_buf = busy_buf;
	210	t[0].len = sizeof(u32);
	211	spi_message_add_tail(&t[0], &m);
8197b711	212	spi_sync(wl_to_spi(wl), &m);
545f1da8 JO	213
	214	if (*busy_buf & 0x1) {
	215	spi_message_init(&m);
	216	memset(t, 0, sizeof(t));
	217	t[0].rx_buf = buf;
	218	t[0].len = len;
	219	spi_message_add_tail(&t[0], &m);
8197b711	220	spi_sync(wl_to_spi(wl), &m);
545f1da8 JO	221	return;
	222	}
	223	}
	224
	225	/* The SPI bus is unresponsive, the read failed. */
	226	memset(buf, 0, len);
	227	wl1271_error("SPI read busy-word timeout!\n");
	228	}
938e30c9	229	#endif
545f1da8	230
760d969f	231	static void wl1271_spi_raw_read(struct wl1271 wl, int addr, void buf,
74621417	232	size_t len, bool fixed)
f5fc0f86 LC	233	{
	234	struct spi_transfer t[3];
	235	struct spi_message m;
545f1da8	236	u32 *busy_buf;
f5fc0f86 LC	237	u32 *cmd;
	238
	239	cmd = &wl->buffer_cmd;
	240	busy_buf = wl->buffer_busyword;
	241
	242	*cmd = 0;
	243	*cmd \|= WSPI_CMD_READ;
	244	*cmd \|= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	245	*cmd \|= addr & WSPI_CMD_BYTE_ADDR;
	246
	247	if (fixed)
	248	*cmd \|= WSPI_CMD_FIXED;
	249
	250	spi_message_init(&m);
	251	memset(t, 0, sizeof(t));
	252
	253	t[0].tx_buf = cmd;
	254	t[0].len = 4;
	255	spi_message_add_tail(&t[0], &m);
	256
	257	/* Busy and non busy words read */
	258	t[1].rx_buf = busy_buf;
	259	t[1].len = WL1271_BUSY_WORD_LEN;
	260	spi_message_add_tail(&t[1], &m);
	261
	262	t[2].rx_buf = buf;
	263	t[2].len = len;
	264	spi_message_add_tail(&t[2], &m);
	265
8197b711	266	spi_sync(wl_to_spi(wl), &m);
f5fc0f86	267
c6d5d06e JO	268	/* FIXME: Check busy words, removed due to SPI bug */
	269	/* if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1))
	270	wl1271_spi_read_busy(wl, buf, len); */
f5fc0f86 LC	271
	272	wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
	273	wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
	274	}
	275
760d969f	276	static void wl1271_spi_raw_write(struct wl1271 wl, int addr, void buf,
74621417	277	size_t len, bool fixed)
f5fc0f86 LC	278	{
	279	struct spi_transfer t[2];
	280	struct spi_message m;
	281	u32 *cmd;
	282
	283	cmd = &wl->buffer_cmd;
	284
	285	*cmd = 0;
	286	*cmd \|= WSPI_CMD_WRITE;
	287	*cmd \|= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	288	*cmd \|= addr & WSPI_CMD_BYTE_ADDR;
	289
	290	if (fixed)
	291	*cmd \|= WSPI_CMD_FIXED;
	292
	293	spi_message_init(&m);
	294	memset(t, 0, sizeof(t));
	295
	296	t[0].tx_buf = cmd;
	297	t[0].len = sizeof(*cmd);
	298	spi_message_add_tail(&t[0], &m);
	299
	300	t[1].tx_buf = buf;
	301	t[1].len = len;
	302	spi_message_add_tail(&t[1], &m);
	303
8197b711	304	spi_sync(wl_to_spi(wl), &m);
f5fc0f86 LC	305
	306	wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
	307	wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
	308	}
2d5e82b8 TP	309
	310	static irqreturn_t wl1271_irq(int irq, void *cookie)
	311	{
	312	struct wl1271 *wl;
	313	unsigned long flags;
	314
	315	wl1271_debug(DEBUG_IRQ, "IRQ");
	316
	317	wl = cookie;
	318
	319	/* complete the ELP completion */
	320	spin_lock_irqsave(&wl->wl_lock, flags);
	321	if (wl->elp_compl) {
	322	complete(wl->elp_compl);
	323	wl->elp_compl = NULL;
	324	}
	325
1e73eb62 JO	326	if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
	327	ieee80211_queue_work(wl->hw, &wl->irq_work);
	328	set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags);
2d5e82b8 TP	329	spin_unlock_irqrestore(&wl->wl_lock, flags);
	330
	331	return IRQ_HANDLED;
	332	}
	333
becd551c TP	334	static void wl1271_spi_set_power(struct wl1271 *wl, bool enable)
	335	{
	336	if (wl->set_power)
	337	wl->set_power(enable);
	338	}
	339
8197b711 TP	340	static struct wl1271_if_operations spi_ops = {
	341	.read = wl1271_spi_raw_read,
	342	.write = wl1271_spi_raw_write,
	343	.reset = wl1271_spi_reset,
	344	.init = wl1271_spi_init,
becd551c	345	.power = wl1271_spi_set_power,
8197b711 TP	346	.dev = wl1271_spi_wl_to_dev,
	347	.enable_irq = wl1271_spi_enable_interrupts,
	348	.disable_irq = wl1271_spi_disable_interrupts
	349	};
	350
2d5e82b8 TP	351	static int __devinit wl1271_probe(struct spi_device *spi)
	352	{
	353	struct wl12xx_platform_data *pdata;
	354	struct ieee80211_hw *hw;
	355	struct wl1271 *wl;
	356	int ret;
	357
	358	pdata = spi->dev.platform_data;
	359	if (!pdata) {
	360	wl1271_error("no platform data");
	361	return -ENODEV;
	362	}
	363
	364	hw = wl1271_alloc_hw();
	365	if (IS_ERR(hw))
	366	return PTR_ERR(hw);
	367
	368	wl = hw->priv;
	369
	370	dev_set_drvdata(&spi->dev, wl);
8197b711 TP	371	wl->if_priv = spi;
	372
	373	wl->if_ops = &spi_ops;
2d5e82b8 TP	374
	375	/* This is the only SPI value that we need to set here, the rest
	376	* comes from the board-peripherals file */
	377	spi->bits_per_word = 32;
	378
	379	ret = spi_setup(spi);
	380	if (ret < 0) {
	381	wl1271_error("spi_setup failed");
	382	goto out_free;
	383	}
	384
	385	wl->set_power = pdata->set_power;
	386	if (!wl->set_power) {
	387	wl1271_error("set power function missing in platform data");
	388	ret = -ENODEV;
	389	goto out_free;
	390	}
	391
	392	wl->irq = spi->irq;
	393	if (wl->irq < 0) {
	394	wl1271_error("irq missing in platform data");
	395	ret = -ENODEV;
	396	goto out_free;
	397	}
	398
	399	ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
	400	if (ret < 0) {
	401	wl1271_error("request_irq() failed: %d", ret);
	402	goto out_free;
	403	}
	404
	405	set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
	406
	407	disable_irq(wl->irq);
	408
2d5e82b8 TP	409	ret = wl1271_init_ieee80211(wl);
2d5e82b8 TP	410	if (ret)
a1dd8187	411	goto out_irq;
2d5e82b8 TP	412
	413	ret = wl1271_register_hw(wl);
	414	if (ret)
a1dd8187	415	goto out_irq;
2d5e82b8 TP	416
	417	wl1271_notice("initialized");
	418
	419	return 0;
	420
2d5e82b8 TP	421	out_irq:
	422	free_irq(wl->irq, wl);
	423
	424	out_free:
3b56dd6a	425	wl1271_free_hw(wl);
2d5e82b8 TP	426
	427	return ret;
	428	}
	429
	430	static int __devexit wl1271_remove(struct spi_device *spi)
	431	{
	432	struct wl1271 *wl = dev_get_drvdata(&spi->dev);
	433
2d5e82b8 TP	434	free_irq(wl->irq, wl);
2d5e82b8 TP	435
3b56dd6a	436	wl1271_unregister_hw(wl);
2d5e82b8 TP	437	wl1271_free_hw(wl);
	438
	439	return 0;
	440	}
	441
	442
	443	static struct spi_driver wl1271_spi_driver = {
	444	.driver = {
	445	.name = "wl1271",
	446	.bus = &spi_bus_type,
	447	.owner = THIS_MODULE,
	448	},
	449
	450	.probe = wl1271_probe,
	451	.remove = __devexit_p(wl1271_remove),
	452	};
	453
	454	static int __init wl1271_init(void)
	455	{
	456	int ret;
	457
	458	ret = spi_register_driver(&wl1271_spi_driver);
	459	if (ret < 0) {
	460	wl1271_error("failed to register spi driver: %d", ret);
	461	goto out;
	462	}
	463
	464	out:
	465	return ret;
	466	}
	467
	468	static void __exit wl1271_exit(void)
	469	{
	470	spi_unregister_driver(&wl1271_spi_driver);
	471
	472	wl1271_notice("unloaded");
	473	}
	474
	475	module_init(wl1271_init);
	476	module_exit(wl1271_exit);
	477
	478	MODULE_LICENSE("GPL");
	479	MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
	480	MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
	481	MODULE_FIRMWARE(WL1271_FW_NAME);