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

 /*
  * 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/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/platform_device.h>

 #include "wlcore.h"
 #include "wl12xx_80211.h"
 #include "io.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

 /* HW limitation: maximum possible chunk size is 4095 bytes */
 #define WSPI_MAX_CHUNK_SIZE    4092

 /*
  * only support SPI for 12xx - this code should be reworked when 18xx
  * support is introduced
  */
 #define SPI_AGGR_BUFFER_SIZE (4 * PAGE_SIZE)

 /* Maximum number of SPI write chunks */
 #define WSPI_MAX_NUM_OF_CHUNKS \
 	((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)


 struct wl12xx_spi_glue {
 	struct device *dev;
 	struct platform_device *core;
 };

 static void wl12xx_spi_reset(struct device *child)
 {
 	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
 	u8 *cmd;
 	struct spi_transfer t;
 	struct spi_message m;

 	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
 	if (!cmd) {
 		dev_err(child->parent,
 			"could not allocate cmd for spi reset\n");
 		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(to_spi_device(glue->dev), &m);

 	kfree(cmd);
 }

 static void wl12xx_spi_init(struct device *child)
 {
 	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
 	struct spi_transfer t;
 	struct spi_message m;
 	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);

 	if (!cmd) {
 		dev_err(child->parent,
 			"could not allocate cmd for spi init\n");
 		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(to_spi_device(glue->dev), &m);
 	kfree(cmd);
 }

 #define WL1271_BUSY_WORD_TIMEOUT 1000

 static int wl12xx_spi_read_busy(struct device *child)
 {
 	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
 	struct wl1271 *wl = dev_get_drvdata(child);
 	struct spi_transfer t[1];
 	struct spi_message m;
 	u32 *busy_buf;
 	int num_busy_bytes = 0;

 	/*
 	 * Read further busy words from SPI until a non-busy word is
 	 * encountered, then read the data itself into the buffer.
 	 */

 	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);
 		t[0].cs_change = true;
 		spi_message_add_tail(&t[0], &m);
 		spi_sync(to_spi_device(glue->dev), &m);

 		if (*busy_buf & 0x1)
 			return 0;
 	}

 	/* The SPI bus is unresponsive, the read failed. */
 	dev_err(child->parent, "SPI read busy-word timeout!\n");
 	return -ETIMEDOUT;
 }

 static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
 					    void *buf, size_t len, bool fixed)
 {
 	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
 	struct wl1271 *wl = dev_get_drvdata(child);
 	struct spi_transfer t[2];
 	struct spi_message m;
 	u32 *busy_buf;
 	u32 *cmd;
 	u32 chunk_len;

 	while (len > 0) {
 		chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);

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

 		*cmd = 0;
 		*cmd |= WSPI_CMD_READ;
 		*cmd |= (chunk_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;
 		t[0].cs_change = true;
 		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;
 		t[1].cs_change = true;
 		spi_message_add_tail(&t[1], &m);

 		spi_sync(to_spi_device(glue->dev), &m);

 		if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
 		    wl12xx_spi_read_busy(child)) {
 			memset(buf, 0, chunk_len);
 			return 0;
 		}

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

 		t[0].rx_buf = buf;
 		t[0].len = chunk_len;
 		t[0].cs_change = true;
 		spi_message_add_tail(&t[0], &m);

 		spi_sync(to_spi_device(glue->dev), &m);

 		if (!fixed)
 			addr += chunk_len;
 		buf += chunk_len;
 		len -= chunk_len;
 	}

 	return 0;
 }

 static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
 					     void *buf, size_t len, bool fixed)
 {
 	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
 	/* SPI write buffers - 2 for each chunk */
 	struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
 	struct spi_message m;
 	u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
 	u32 *cmd;
 	u32 chunk_len;
 	int i;

 	WARN_ON(len > SPI_AGGR_BUFFER_SIZE);

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

 	cmd = &commands[0];
 	i = 0;
 	while (len > 0) {
 		chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);

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

 		if (fixed)
 			*cmd |= WSPI_CMD_FIXED;

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

 		t[i].tx_buf = buf;
 		t[i].len = chunk_len;
 		spi_message_add_tail(&t[i++], &m);

 		if (!fixed)
 			addr += chunk_len;
 		buf += chunk_len;
 		len -= chunk_len;
 		cmd++;
 	}

 	spi_sync(to_spi_device(glue->dev), &m);

 	return 0;
 }

 static struct wl1271_if_operations spi_ops = {
 	.read		= wl12xx_spi_raw_read,
 	.write		= wl12xx_spi_raw_write,
 	.reset		= wl12xx_spi_reset,
 	.init		= wl12xx_spi_init,
 	.set_block_size = NULL,
 };

 static int wl1271_probe(struct spi_device *spi)
 {
 	struct wl12xx_spi_glue *glue;
 	struct wlcore_platdev_data pdev_data;
 	struct resource res[1];
 	int ret;

 	memset(&pdev_data, 0x00, sizeof(pdev_data));

 	/* TODO: add DT parsing when needed */

 	pdev_data.if_ops = &spi_ops;

 	glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
 	if (!glue) {
 		dev_err(&spi->dev, "can't allocate glue\n");
 		return -ENOMEM;
 	}

 	glue->dev = &spi->dev;

 	spi_set_drvdata(spi, glue);

 	/* 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) {
 		dev_err(glue->dev, "spi_setup failed\n");
 		return ret;
 	}

 	glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
 	if (!glue->core) {
 		dev_err(glue->dev, "can't allocate platform_device\n");
 		return -ENOMEM;
 	}

 	glue->core->dev.parent = &spi->dev;

 	memset(res, 0x00, sizeof(res));

 	res[0].start = spi->irq;
 	res[0].flags = IORESOURCE_IRQ;
 	res[0].name = "irq";

 	ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
 	if (ret) {
 		dev_err(glue->dev, "can't add resources\n");
 		goto out_dev_put;
 	}

 	ret = platform_device_add_data(glue->core, &pdev_data,
 				       sizeof(pdev_data));
 	if (ret) {
 		dev_err(glue->dev, "can't add platform data\n");
 		goto out_dev_put;
 	}

 	ret = platform_device_add(glue->core);
 	if (ret) {
 		dev_err(glue->dev, "can't register platform device\n");
 		goto out_dev_put;
 	}

 	return 0;

 out_dev_put:
 	platform_device_put(glue->core);
 	return ret;
 }

 static int wl1271_remove(struct spi_device *spi)
 {
 	struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);

 	platform_device_unregister(glue->core);

 	return 0;
 }


 static struct spi_driver wl1271_spi_driver = {
 	.driver = {
 		.name		= "wl1271_spi",
 	},

 	.probe		= wl1271_probe,
 	.remove		= wl1271_remove,
 };

 module_spi_driver(wl1271_spi_driver);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
 MODULE_ALIAS("spi:wl1271");
	/*
	* 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/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/platform_device.h>

	#include "wlcore.h"
	#include "wl12xx_80211.h"
	#include "io.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

	/* HW limitation: maximum possible chunk size is 4095 bytes */
	#define WSPI_MAX_CHUNK_SIZE 4092

	/*
	* only support SPI for 12xx - this code should be reworked when 18xx
	* support is introduced
	*/
	#define SPI_AGGR_BUFFER_SIZE (4 * PAGE_SIZE)

	/* Maximum number of SPI write chunks */
	#define WSPI_MAX_NUM_OF_CHUNKS \
	((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)


	struct wl12xx_spi_glue {
	struct device *dev;
	struct platform_device *core;
	};

	static void wl12xx_spi_reset(struct device *child)
	{
	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
	u8 *cmd;
	struct spi_transfer t;
	struct spi_message m;

	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	if (!cmd) {
	dev_err(child->parent,
	"could not allocate cmd for spi reset\n");
	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(to_spi_device(glue->dev), &m);

	kfree(cmd);
	}

	static void wl12xx_spi_init(struct device *child)
	{
	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
	struct spi_transfer t;
	struct spi_message m;
	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);

	if (!cmd) {
	dev_err(child->parent,
	"could not allocate cmd for spi init\n");
	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(to_spi_device(glue->dev), &m);
	kfree(cmd);
	}

	#define WL1271_BUSY_WORD_TIMEOUT 1000

	static int wl12xx_spi_read_busy(struct device *child)
	{
	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
	struct wl1271 *wl = dev_get_drvdata(child);
	struct spi_transfer t[1];
	struct spi_message m;
	u32 *busy_buf;
	int num_busy_bytes = 0;

	/*
	* Read further busy words from SPI until a non-busy word is
	* encountered, then read the data itself into the buffer.
	*/

	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);
	t[0].cs_change = true;
	spi_message_add_tail(&t[0], &m);
	spi_sync(to_spi_device(glue->dev), &m);

	if (*busy_buf & 0x1)
	return 0;
	}

	/* The SPI bus is unresponsive, the read failed. */
	dev_err(child->parent, "SPI read busy-word timeout!\n");
	return -ETIMEDOUT;
	}

	static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
	void *buf, size_t len, bool fixed)
	{
	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
	struct wl1271 *wl = dev_get_drvdata(child);
	struct spi_transfer t[2];
	struct spi_message m;
	u32 *busy_buf;
	u32 *cmd;
	u32 chunk_len;

	while (len > 0) {
	chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);

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

	*cmd = 0;
	*cmd \|= WSPI_CMD_READ;
	*cmd \|= (chunk_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;
	t[0].cs_change = true;
	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;
	t[1].cs_change = true;
	spi_message_add_tail(&t[1], &m);

	spi_sync(to_spi_device(glue->dev), &m);

	if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
	wl12xx_spi_read_busy(child)) {
	memset(buf, 0, chunk_len);
	return 0;
	}

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

	t[0].rx_buf = buf;
	t[0].len = chunk_len;
	t[0].cs_change = true;
	spi_message_add_tail(&t[0], &m);

	spi_sync(to_spi_device(glue->dev), &m);

	if (!fixed)
	addr += chunk_len;
	buf += chunk_len;
	len -= chunk_len;
	}

	return 0;
	}

	static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
	void *buf, size_t len, bool fixed)
	{
	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
	/* SPI write buffers - 2 for each chunk */
	struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
	struct spi_message m;
	u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
	u32 *cmd;
	u32 chunk_len;
	int i;

	WARN_ON(len > SPI_AGGR_BUFFER_SIZE);

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

	cmd = &commands[0];
	i = 0;
	while (len > 0) {
	chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);

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

	if (fixed)
	*cmd \|= WSPI_CMD_FIXED;

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

	t[i].tx_buf = buf;
	t[i].len = chunk_len;
	spi_message_add_tail(&t[i++], &m);

	if (!fixed)
	addr += chunk_len;
	buf += chunk_len;
	len -= chunk_len;
	cmd++;
	}

	spi_sync(to_spi_device(glue->dev), &m);

	return 0;
	}

	static struct wl1271_if_operations spi_ops = {
	.read = wl12xx_spi_raw_read,
	.write = wl12xx_spi_raw_write,
	.reset = wl12xx_spi_reset,
	.init = wl12xx_spi_init,
	.set_block_size = NULL,
	};

	static int wl1271_probe(struct spi_device *spi)
	{
	struct wl12xx_spi_glue *glue;
	struct wlcore_platdev_data pdev_data;
	struct resource res[1];
	int ret;

	memset(&pdev_data, 0x00, sizeof(pdev_data));

	/* TODO: add DT parsing when needed */

	pdev_data.if_ops = &spi_ops;

	glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
	if (!glue) {
	dev_err(&spi->dev, "can't allocate glue\n");
	return -ENOMEM;
	}

	glue->dev = &spi->dev;

	spi_set_drvdata(spi, glue);

	/* 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) {
	dev_err(glue->dev, "spi_setup failed\n");
	return ret;
	}

	glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
	if (!glue->core) {
	dev_err(glue->dev, "can't allocate platform_device\n");
	return -ENOMEM;
	}

	glue->core->dev.parent = &spi->dev;

	memset(res, 0x00, sizeof(res));

	res[0].start = spi->irq;
	res[0].flags = IORESOURCE_IRQ;
	res[0].name = "irq";

	ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
	if (ret) {
	dev_err(glue->dev, "can't add resources\n");
	goto out_dev_put;
	}

	ret = platform_device_add_data(glue->core, &pdev_data,
	sizeof(pdev_data));
	if (ret) {
	dev_err(glue->dev, "can't add platform data\n");
	goto out_dev_put;
	}

	ret = platform_device_add(glue->core);
	if (ret) {
	dev_err(glue->dev, "can't register platform device\n");
	goto out_dev_put;
	}

	return 0;

	out_dev_put:
	platform_device_put(glue->core);
	return ret;
	}

	static int wl1271_remove(struct spi_device *spi)
	{
	struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);

	platform_device_unregister(glue->core);

	return 0;
	}


	static struct spi_driver wl1271_spi_driver = {
	.driver = {
	.name = "wl1271_spi",
	},

	.probe = wl1271_probe,
	.remove = wl1271_remove,
	};

	module_spi_driver(wl1271_spi_driver);
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
	MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
	MODULE_ALIAS("spi:wl1271");