[deliverable/linux.git] / drivers / net / wireless / ti / wlcore / 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/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 <linux/of_irq.h>
#include <linux/regulator/consumer.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

/*
 * wl18xx driver aggregation buffer size is (13 * PAGE_SIZE) compared to
 * (4 * PAGE_SIZE) for wl12xx, so use the larger buffer needed for wl18xx
 */
#define SPI_AGGR_BUFFER_SIZE (13 * PAGE_SIZE)

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


struct wilink_familiy_data {
	char name[8];
};

static const struct wilink_familiy_data *wilink_data;

static const struct wilink_familiy_data wl18xx_data = {
	.name = "wl18xx",
};

static const struct wilink_familiy_data wl12xx_data = {
	.name = "wl12xx",
};

struct wl12xx_spi_glue {
	struct device *dev;
	struct platform_device *core;
	struct regulator *reg; /* Power regulator */
};

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;
	struct spi_device *spi = to_spi_device(glue->dev);
	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);

	/* Send extra clocks with inverted CS (high). this is required
	 * by the wilink family in order to successfully enter WSPI mode.
	 */
	spi->mode ^= SPI_CS_HIGH;
	memset(&m, 0, sizeof(m));
	spi_message_init(&m);

	cmd[0] = 0xff;
	cmd[1] = 0xff;
	cmd[2] = 0xff;
	cmd[3] = 0xff;
	__swab32s((u32 *)cmd);

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

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

	/* Restore chip select configration to normal */
	spi->mode ^= SPI_CS_HIGH;
	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 __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);
	struct spi_transfer *t;
	struct spi_message m;
	u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
	u32 *cmd;
	u32 chunk_len;
	int i;

	/* SPI write buffers - 2 for each chunk */
	t = kzalloc(sizeof(*t) * 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL);
	if (!t)
		return -ENOMEM;

	WARN_ON(len > SPI_AGGR_BUFFER_SIZE);

	spi_message_init(&m);

	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);

	kfree(t);
	return 0;
}

static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
					     void *buf, size_t len, bool fixed)
{
	int ret;

	/* The ELP wakeup write may fail the first time due to internal
	 * hardware latency. It is safer to send the wakeup command twice to
	 * avoid unexpected failures.
	 */
	if (addr == HW_ACCESS_ELP_CTRL_REG)
		ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
	ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed);

	return ret;
}

/**
 * wl12xx_spi_set_power - power on/off the wl12xx unit
 * @child: wl12xx device handle.
 * @enable: true/false to power on/off the unit.
 *
 * use the WiFi enable regulator to enable/disable the WiFi unit.
 */
static int wl12xx_spi_set_power(struct device *child, bool enable)
{
	int ret = 0;
	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);

	WARN_ON(!glue->reg);

	/* Update regulator state */
	if (enable) {
		ret = regulator_enable(glue->reg);
		if (ret)
			dev_err(child, "Power enable failure\n");
	} else {
		ret =  regulator_disable(glue->reg);
		if (ret)
			dev_err(child, "Power disable failure\n");
	}

	return ret;
}

/**
 * wl12xx_spi_set_block_size
 *
 * This function is not needed for spi mode, but need to be present.
 * Without it defined the wlcore fallback to use the wrong packet
 * allignment on tx.
 */
static void wl12xx_spi_set_block_size(struct device *child,
				      unsigned int blksz)
{
}

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,
	.power		= wl12xx_spi_set_power,
	.set_block_size = wl12xx_spi_set_block_size,
};

static const struct of_device_id wlcore_spi_of_match_table[] = {
	{ .compatible = "ti,wl1271", .data = &wl12xx_data},
	{ .compatible = "ti,wl1273", .data = &wl12xx_data},
	{ .compatible = "ti,wl1281", .data = &wl12xx_data},
	{ .compatible = "ti,wl1283", .data = &wl12xx_data},
	{ .compatible = "ti,wl1801", .data = &wl18xx_data},
	{ .compatible = "ti,wl1805", .data = &wl18xx_data},
	{ .compatible = "ti,wl1807", .data = &wl18xx_data},
	{ .compatible = "ti,wl1831", .data = &wl18xx_data},
	{ .compatible = "ti,wl1835", .data = &wl18xx_data},
	{ .compatible = "ti,wl1837", .data = &wl18xx_data},
	{ }
};
MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table);

/**
 * wlcore_probe_of - DT node parsing.
 * @spi: SPI slave device parameters.
 * @res: resource parameters.
 * @glue: wl12xx SPI bus to slave device glue parameters.
 * @pdev_data: wlcore device parameters
 */
static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue,
			   struct wlcore_platdev_data *pdev_data)
{
	struct device_node *dt_node = spi->dev.of_node;
	const struct of_device_id *of_id;

	of_id = of_match_node(wlcore_spi_of_match_table, dt_node);
	if (!of_id)
		return -ENODEV;

	wilink_data = of_id->data;
	dev_info(&spi->dev, "selected chip familiy is %s\n",
		 wilink_data->name);

	if (of_find_property(dt_node, "clock-xtal", NULL))
		pdev_data->ref_clock_xtal = true;

	/* optional clock frequency params */
	of_property_read_u32(dt_node, "ref-clock-frequency",
			     &pdev_data->ref_clock_freq);
	of_property_read_u32(dt_node, "tcxo-clock-frequency",
			     &pdev_data->tcxo_clock_freq);

	return 0;
}

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));

	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;

	glue->reg = devm_regulator_get(&spi->dev, "vwlan");
	if (PTR_ERR(glue->reg) == -EPROBE_DEFER)
		return -EPROBE_DEFER;
	if (IS_ERR(glue->reg)) {
		dev_err(glue->dev, "can't get regulator\n");
		return PTR_ERR(glue->reg);
	}

	ret = wlcore_probe_of(spi, glue, &pdev_data);
	if (ret) {
		dev_err(glue->dev,
			"can't get device tree parameters (%d)\n", ret);
		return ret;
	}

	ret = spi_setup(spi);
	if (ret < 0) {
		dev_err(glue->dev, "spi_setup failed\n");
		return ret;
	}

	glue->core = platform_device_alloc(wilink_data->name,
					   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 | irq_get_trigger_type(spi->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",
		.of_match_table = of_match_ptr(wlcore_spi_of_match_table),
	},

	.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");
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
a6b7a407	24	#include <linux/interrupt.h>
2d5e82b8	25	#include <linux/irq.h>
f5fc0f86	26	#include <linux/module.h>
e757201b GS	27	#include <linux/slab.h>
e757201b GS	28	#include <linux/swab.h>
f5fc0f86 LC	29	#include <linux/crc7.h>
f5fc0f86 LC	30	#include <linux/spi/spi.h>
c1f9a095	31	#include <linux/wl12xx.h>
0969d679	32	#include <linux/platform_device.h>
04654c38	33	#include <linux/of_irq.h>
4c1ce07b	34	#include <linux/regulator/consumer.h>
f5fc0f86	35
c31be25a	36	#include "wlcore.h"
f5fc0f86	37	#include "wl12xx_80211.h"
00d20100	38	#include "io.h"
f5fc0f86	39
760d969f TP	40	#define WSPI_CMD_READ 0x40000000
	41	#define WSPI_CMD_WRITE 0x00000000
	42	#define WSPI_CMD_FIXED 0x20000000
	43	#define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
	44	#define WSPI_CMD_BYTE_LENGTH_OFFSET 17
	45	#define WSPI_CMD_BYTE_ADDR 0x0001FFFF
	46
	47	#define WSPI_INIT_CMD_CRC_LEN 5
	48
	49	#define WSPI_INIT_CMD_START 0x00
	50	#define WSPI_INIT_CMD_TX 0x40
	51	/* the extra bypass bit is sampled by the TNET as '1' */
	52	#define WSPI_INIT_CMD_BYPASS_BIT 0x80
	53	#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
	54	#define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
	55	#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
	56	#define WSPI_INIT_CMD_IOD 0x40
	57	#define WSPI_INIT_CMD_IP 0x20
	58	#define WSPI_INIT_CMD_CS 0x10
	59	#define WSPI_INIT_CMD_WS 0x08
	60	#define WSPI_INIT_CMD_WSPI 0x01
	61	#define WSPI_INIT_CMD_END 0x01
	62
	63	#define WSPI_INIT_CMD_LEN 8
	64
	65	#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
	66	((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
	67	#define HW_ACCESS_WSPI_INIT_CMD_MASK 0
	68
5c57a901 IY	69	/* HW limitation: maximum possible chunk size is 4095 bytes */
	70	#define WSPI_MAX_CHUNK_SIZE 4092
	71
61932ba5	72	/*
01efe65a ER	73	* wl18xx driver aggregation buffer size is (13 * PAGE_SIZE) compared to
01efe65a ER	74	* (4 * PAGE_SIZE) for wl12xx, so use the larger buffer needed for wl18xx
61932ba5	75	*/
01efe65a	76	#define SPI_AGGR_BUFFER_SIZE (13 * PAGE_SIZE)
61932ba5	77
9b2761cb UM	78	/* Maximum number of SPI write chunks */
	79	#define WSPI_MAX_NUM_OF_CHUNKS \
	80	((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)
	81
5c57a901	82
01efe65a ER	83	struct wilink_familiy_data {
	84	char name[8];
	85	};
	86
4ad0579a	87	static const struct wilink_familiy_data *wilink_data;
01efe65a ER	88
	89	static const struct wilink_familiy_data wl18xx_data = {
	90	.name = "wl18xx",
	91	};
	92
	93	static const struct wilink_familiy_data wl12xx_data = {
	94	.name = "wl12xx",
	95	};
	96
b65019f6 FB	97	struct wl12xx_spi_glue {
b65019f6 FB	98	struct device *dev;
0969d679	99	struct platform_device *core;
4c1ce07b	100	struct regulator reg; / Power regulator */
b65019f6 FB	101	};
b65019f6 FB	102
a390e85c	103	static void wl12xx_spi_reset(struct device *child)
8197b711	104	{
a390e85c	105	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
f5fc0f86 LC	106	u8 *cmd;
	107	struct spi_transfer t;
	108	struct spi_message m;
	109
	110	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	111	if (!cmd) {
e5d3625e LC	112	dev_err(child->parent,
e5d3625e LC	113	"could not allocate cmd for spi reset\n");
f5fc0f86 LC	114	return;
	115	}
	116
	117	memset(&t, 0, sizeof(t));
	118	spi_message_init(&m);
	119
	120	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
	121
	122	t.tx_buf = cmd;
	123	t.len = WSPI_INIT_CMD_LEN;
	124	spi_message_add_tail(&t, &m);
	125
b65019f6	126	spi_sync(to_spi_device(glue->dev), &m);
f5fc0f86	127
0dd38667	128	kfree(cmd);
f5fc0f86 LC	129	}
f5fc0f86 LC	130
a390e85c	131	static void wl12xx_spi_init(struct device *child)
f5fc0f86	132	{
a390e85c	133	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
f5fc0f86 LC	134	struct spi_transfer t;
f5fc0f86 LC	135	struct spi_message m;
01efe65a	136	struct spi_device *spi = to_spi_device(glue->dev);
e757201b	137	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
f5fc0f86	138
f5fc0f86	139	if (!cmd) {
e5d3625e LC	140	dev_err(child->parent,
e5d3625e LC	141	"could not allocate cmd for spi init\n");
f5fc0f86 LC	142	return;
	143	}
	144
f5fc0f86 LC	145	memset(&t, 0, sizeof(t));
	146	spi_message_init(&m);
	147
	148	/*
	149	* Set WSPI_INIT_COMMAND
	150	* the data is being send from the MSB to LSB
	151	*/
e757201b GS	152	cmd[0] = 0xff;
	153	cmd[1] = 0xff;
	154	cmd[2] = WSPI_INIT_CMD_START \| WSPI_INIT_CMD_TX;
	155	cmd[3] = 0;
	156	cmd[4] = 0;
	157	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
	158	cmd[5] \|= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
	159
	160	cmd[6] = WSPI_INIT_CMD_IOD \| WSPI_INIT_CMD_IP \| WSPI_INIT_CMD_CS
	161	\| WSPI_INIT_CMD_WSPI \| WSPI_INIT_CMD_WS;
f5fc0f86 LC	162
f5fc0f86 LC	163	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
e757201b	164	cmd[6] \|= WSPI_INIT_CMD_DIS_FIXEDBUSY;
f5fc0f86	165	else
e757201b	166	cmd[6] \|= WSPI_INIT_CMD_EN_FIXEDBUSY;
f5fc0f86	167
e757201b	168	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) \| WSPI_INIT_CMD_END;
01efe65a	169
e757201b GS	170	/*
	171	* The above is the logical order; it must actually be stored
	172	* in the buffer byte-swapped.
	173	*/
	174	__swab32s((u32 *)cmd);
	175	__swab32s((u32 *)cmd+1);
f5fc0f86 LC	176
	177	t.tx_buf = cmd;
	178	t.len = WSPI_INIT_CMD_LEN;
	179	spi_message_add_tail(&t, &m);
	180
b65019f6	181	spi_sync(to_spi_device(glue->dev), &m);
01efe65a ER	182
	183	/* Send extra clocks with inverted CS (high). this is required
	184	* by the wilink family in order to successfully enter WSPI mode.
	185	*/
	186	spi->mode ^= SPI_CS_HIGH;
	187	memset(&m, 0, sizeof(m));
	188	spi_message_init(&m);
	189
	190	cmd[0] = 0xff;
	191	cmd[1] = 0xff;
	192	cmd[2] = 0xff;
	193	cmd[3] = 0xff;
	194	__swab32s((u32 *)cmd);
	195
	196	t.tx_buf = cmd;
	197	t.len = 4;
	198	spi_message_add_tail(&t, &m);
	199
	200	spi_sync(to_spi_device(glue->dev), &m);
	201
	202	/* Restore chip select configration to normal */
	203	spi->mode ^= SPI_CS_HIGH;
bb123611	204	kfree(cmd);
f5fc0f86 LC	205	}
f5fc0f86 LC	206
545f1da8 JO	207	#define WL1271_BUSY_WORD_TIMEOUT 1000
545f1da8 JO	208
a390e85c	209	static int wl12xx_spi_read_busy(struct device *child)
545f1da8	210	{
a390e85c FB	211	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
a390e85c FB	212	struct wl1271 *wl = dev_get_drvdata(child);
545f1da8 JO	213	struct spi_transfer t[1];
	214	struct spi_message m;
	215	u32 *busy_buf;
	216	int num_busy_bytes = 0;
	217
545f1da8 JO	218	/*
	219	* Read further busy words from SPI until a non-busy word is
	220	* encountered, then read the data itself into the buffer.
	221	*/
545f1da8 JO	222
	223	num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
	224	busy_buf = wl->buffer_busyword;
	225	while (num_busy_bytes) {
	226	num_busy_bytes--;
	227	spi_message_init(&m);
	228	memset(t, 0, sizeof(t));
	229	t[0].rx_buf = busy_buf;
	230	t[0].len = sizeof(u32);
259da430	231	t[0].cs_change = true;
545f1da8	232	spi_message_add_tail(&t[0], &m);
b65019f6	233	spi_sync(to_spi_device(glue->dev), &m);
545f1da8	234
259da430 JO	235	if (*busy_buf & 0x1)
259da430 JO	236	return 0;
545f1da8 JO	237	}
	238
	239	/* The SPI bus is unresponsive, the read failed. */
e5d3625e	240	dev_err(child->parent, "SPI read busy-word timeout!\n");
259da430	241	return -ETIMEDOUT;
545f1da8 JO	242	}
545f1da8 JO	243
f1a26e63 IY	244	static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
f1a26e63 IY	245	void *buf, size_t len, bool fixed)
f5fc0f86	246	{
a390e85c FB	247	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
a390e85c FB	248	struct wl1271 *wl = dev_get_drvdata(child);
5c57a901	249	struct spi_transfer t[2];
f5fc0f86	250	struct spi_message m;
545f1da8	251	u32 *busy_buf;
f5fc0f86	252	u32 *cmd;
5c57a901	253	u32 chunk_len;
f5fc0f86	254
5c57a901	255	while (len > 0) {
c8e49556	256	chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
f5fc0f86	257
5c57a901 IY	258	cmd = &wl->buffer_cmd;
5c57a901 IY	259	busy_buf = wl->buffer_busyword;
f5fc0f86	260
5c57a901 IY	261	*cmd = 0;
	262	*cmd \|= WSPI_CMD_READ;
	263	*cmd \|= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
	264	WSPI_CMD_BYTE_LENGTH;
	265	*cmd \|= addr & WSPI_CMD_BYTE_ADDR;
f5fc0f86	266
5c57a901 IY	267	if (fixed)
5c57a901 IY	268	*cmd \|= WSPI_CMD_FIXED;
f5fc0f86	269
5c57a901 IY	270	spi_message_init(&m);
5c57a901 IY	271	memset(t, 0, sizeof(t));
f5fc0f86	272
5c57a901 IY	273	t[0].tx_buf = cmd;
	274	t[0].len = 4;
	275	t[0].cs_change = true;
	276	spi_message_add_tail(&t[0], &m);
f5fc0f86	277
5c57a901 IY	278	/* Busy and non busy words read */
	279	t[1].rx_buf = busy_buf;
	280	t[1].len = WL1271_BUSY_WORD_LEN;
	281	t[1].cs_change = true;
	282	spi_message_add_tail(&t[1], &m);
f5fc0f86	283
b65019f6	284	spi_sync(to_spi_device(glue->dev), &m);
259da430	285
5c57a901	286	if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
a390e85c	287	wl12xx_spi_read_busy(child)) {
5c57a901	288	memset(buf, 0, chunk_len);
02eb1d9d	289	return 0;
5c57a901	290	}
259da430	291
5c57a901 IY	292	spi_message_init(&m);
5c57a901 IY	293	memset(t, 0, sizeof(t));
259da430	294
5c57a901 IY	295	t[0].rx_buf = buf;
	296	t[0].len = chunk_len;
	297	t[0].cs_change = true;
	298	spi_message_add_tail(&t[0], &m);
	299
b65019f6	300	spi_sync(to_spi_device(glue->dev), &m);
f5fc0f86	301
5c57a901 IY	302	if (!fixed)
	303	addr += chunk_len;
	304	buf += chunk_len;
	305	len -= chunk_len;
	306	}
02eb1d9d IY	307
02eb1d9d IY	308	return 0;
f5fc0f86 LC	309	}
f5fc0f86 LC	310
01efe65a ER	311	static int __wl12xx_spi_raw_write(struct device *child, int addr,
01efe65a ER	312	void *buf, size_t len, bool fixed)
f5fc0f86	313	{
a390e85c	314	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
01efe65a	315	struct spi_transfer *t;
f5fc0f86	316	struct spi_message m;
9b2761cb	317	u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
f5fc0f86	318	u32 *cmd;
5c57a901 IY	319	u32 chunk_len;
5c57a901 IY	320	int i;
f5fc0f86	321
01efe65a ER	322	/* SPI write buffers - 2 for each chunk */
	323	t = kzalloc(sizeof(t) 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL);
	324	if (!t)
	325	return -ENOMEM;
	326
61932ba5	327	WARN_ON(len > SPI_AGGR_BUFFER_SIZE);
f5fc0f86 LC	328
f5fc0f86 LC	329	spi_message_init(&m);
f5fc0f86	330
5c57a901 IY	331	cmd = &commands[0];
	332	i = 0;
	333	while (len > 0) {
c8e49556	334	chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
f5fc0f86	335
5c57a901 IY	336	*cmd = 0;
	337	*cmd \|= WSPI_CMD_WRITE;
	338	*cmd \|= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
	339	WSPI_CMD_BYTE_LENGTH;
	340	*cmd \|= addr & WSPI_CMD_BYTE_ADDR;
f5fc0f86	341
5c57a901 IY	342	if (fixed)
	343	*cmd \|= WSPI_CMD_FIXED;
	344
	345	t[i].tx_buf = cmd;
	346	t[i].len = sizeof(*cmd);
	347	spi_message_add_tail(&t[i++], &m);
	348
	349	t[i].tx_buf = buf;
	350	t[i].len = chunk_len;
	351	spi_message_add_tail(&t[i++], &m);
f5fc0f86	352
5c57a901 IY	353	if (!fixed)
	354	addr += chunk_len;
	355	buf += chunk_len;
	356	len -= chunk_len;
	357	cmd++;
	358	}
	359
b65019f6	360	spi_sync(to_spi_device(glue->dev), &m);
02eb1d9d	361
01efe65a	362	kfree(t);
02eb1d9d	363	return 0;
f5fc0f86	364	}
2d5e82b8	365
01efe65a ER	366	static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
	367	void *buf, size_t len, bool fixed)
	368	{
	369	int ret;
	370
	371	/* The ELP wakeup write may fail the first time due to internal
	372	* hardware latency. It is safer to send the wakeup command twice to
	373	* avoid unexpected failures.
	374	*/
	375	if (addr == HW_ACCESS_ELP_CTRL_REG)
	376	ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
	377	ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
	378
	379	return ret;
	380	}
	381
4c1ce07b UM	382	/**
	383	* wl12xx_spi_set_power - power on/off the wl12xx unit
	384	* @child: wl12xx device handle.
	385	* @enable: true/false to power on/off the unit.
	386	*
	387	* use the WiFi enable regulator to enable/disable the WiFi unit.
	388	*/
	389	static int wl12xx_spi_set_power(struct device *child, bool enable)
	390	{
	391	int ret = 0;
	392	struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
	393
	394	WARN_ON(!glue->reg);
	395
	396	/* Update regulator state */
	397	if (enable) {
	398	ret = regulator_enable(glue->reg);
	399	if (ret)
	400	dev_err(child, "Power enable failure\n");
	401	} else {
	402	ret = regulator_disable(glue->reg);
	403	if (ret)
	404	dev_err(child, "Power disable failure\n");
	405	}
	406
	407	return ret;
	408	}
	409
01efe65a ER	410	/**
	411	* wl12xx_spi_set_block_size
	412	*
	413	* This function is not needed for spi mode, but need to be present.
	414	* Without it defined the wlcore fallback to use the wrong packet
	415	* allignment on tx.
	416	*/
	417	static void wl12xx_spi_set_block_size(struct device *child,
	418	unsigned int blksz)
	419	{
	420	}
	421
8197b711	422	static struct wl1271_if_operations spi_ops = {
a390e85c FB	423	.read = wl12xx_spi_raw_read,
	424	.write = wl12xx_spi_raw_write,
	425	.reset = wl12xx_spi_reset,
	426	.init = wl12xx_spi_init,
4c1ce07b	427	.power = wl12xx_spi_set_power,
01efe65a	428	.set_block_size = wl12xx_spi_set_block_size,
8197b711 TP	429	};
8197b711 TP	430
04654c38	431	static const struct of_device_id wlcore_spi_of_match_table[] = {
01efe65a ER	432	{ .compatible = "ti,wl1271", .data = &wl12xx_data},
	433	{ .compatible = "ti,wl1273", .data = &wl12xx_data},
	434	{ .compatible = "ti,wl1281", .data = &wl12xx_data},
	435	{ .compatible = "ti,wl1283", .data = &wl12xx_data},
	436	{ .compatible = "ti,wl1801", .data = &wl18xx_data},
	437	{ .compatible = "ti,wl1805", .data = &wl18xx_data},
	438	{ .compatible = "ti,wl1807", .data = &wl18xx_data},
	439	{ .compatible = "ti,wl1831", .data = &wl18xx_data},
	440	{ .compatible = "ti,wl1835", .data = &wl18xx_data},
	441	{ .compatible = "ti,wl1837", .data = &wl18xx_data},
04654c38 UM	442	{ }
	443	};
	444	MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table);
	445
	446	/**
	447	* wlcore_probe_of - DT node parsing.
	448	* @spi: SPI slave device parameters.
	449	* @res: resource parameters.
	450	* @glue: wl12xx SPI bus to slave device glue parameters.
	451	* @pdev_data: wlcore device parameters
	452	*/
	453	static int wlcore_probe_of(struct spi_device spi, struct wl12xx_spi_glue glue,
	454	struct wlcore_platdev_data *pdev_data)
	455	{
	456	struct device_node *dt_node = spi->dev.of_node;
01efe65a ER	457	const struct of_device_id *of_id;
	458
	459	of_id = of_match_node(wlcore_spi_of_match_table, dt_node);
	460	if (!of_id)
	461	return -ENODEV;
	462
	463	wilink_data = of_id->data;
	464	dev_info(&spi->dev, "selected chip familiy is %s\n",
	465	wilink_data->name);
04654c38 UM	466
	467	if (of_find_property(dt_node, "clock-xtal", NULL))
	468	pdev_data->ref_clock_xtal = true;
	469
01efe65a ER	470	/* optional clock frequency params */
	471	of_property_read_u32(dt_node, "ref-clock-frequency",
	472	&pdev_data->ref_clock_freq);
	473	of_property_read_u32(dt_node, "tcxo-clock-frequency",
	474	&pdev_data->tcxo_clock_freq);
04654c38 UM	475
	476	return 0;
	477	}
	478
b74324d1	479	static int wl1271_probe(struct spi_device *spi)
2d5e82b8	480	{
b65019f6	481	struct wl12xx_spi_glue *glue;
4c104162	482	struct wlcore_platdev_data pdev_data;
0969d679	483	struct resource res[1];
372e3a84	484	int ret;
2d5e82b8	485
4c104162	486	memset(&pdev_data, 0x00, sizeof(pdev_data));
afb43e6d	487
4c104162	488	pdev_data.if_ops = &spi_ops;
a390e85c	489
372e3a84	490	glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
b65019f6	491	if (!glue) {
e5d3625e	492	dev_err(&spi->dev, "can't allocate glue\n");
372e3a84	493	return -ENOMEM;
b65019f6 FB	494	}
b65019f6 FB	495
b65019f6	496	glue->dev = &spi->dev;
b65019f6 FB	497
b65019f6 FB	498	spi_set_drvdata(spi, glue);
2d5e82b8 TP	499
	500	/* This is the only SPI value that we need to set here, the rest
	501	* comes from the board-peripherals file */
	502	spi->bits_per_word = 32;
	503
4c1ce07b UM	504	glue->reg = devm_regulator_get(&spi->dev, "vwlan");
	505	if (PTR_ERR(glue->reg) == -EPROBE_DEFER)
	506	return -EPROBE_DEFER;
	507	if (IS_ERR(glue->reg)) {
	508	dev_err(glue->dev, "can't get regulator\n");
	509	return PTR_ERR(glue->reg);
	510	}
	511
04654c38	512	ret = wlcore_probe_of(spi, glue, &pdev_data);
287980e4	513	if (ret) {
04654c38 UM	514	dev_err(glue->dev,
	515	"can't get device tree parameters (%d)\n", ret);
	516	return ret;
	517	}
	518
2d5e82b8 TP	519	ret = spi_setup(spi);
2d5e82b8 TP	520	if (ret < 0) {
e5d3625e	521	dev_err(glue->dev, "spi_setup failed\n");
372e3a84	522	return ret;
2d5e82b8 TP	523	}
2d5e82b8 TP	524
01efe65a ER	525	glue->core = platform_device_alloc(wilink_data->name,
01efe65a ER	526	PLATFORM_DEVID_AUTO);
0969d679	527	if (!glue->core) {
e5d3625e	528	dev_err(glue->dev, "can't allocate platform_device\n");
372e3a84	529	return -ENOMEM;
0969d679 FB	530	}
	531
	532	glue->core->dev.parent = &spi->dev;
	533
	534	memset(res, 0x00, sizeof(res));
	535
	536	res[0].start = spi->irq;
04654c38	537	res[0].flags = IORESOURCE_IRQ \| irq_get_trigger_type(spi->irq);
0969d679 FB	538	res[0].name = "irq";
	539
	540	ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
	541	if (ret) {
e5d3625e	542	dev_err(glue->dev, "can't add resources\n");
0969d679 FB	543	goto out_dev_put;
	544	}
	545
4c104162 CE	546	ret = platform_device_add_data(glue->core, &pdev_data,
4c104162 CE	547	sizeof(pdev_data));
0969d679	548	if (ret) {
e5d3625e	549	dev_err(glue->dev, "can't add platform data\n");
0969d679 FB	550	goto out_dev_put;
	551	}
	552
	553	ret = platform_device_add(glue->core);
	554	if (ret) {
e5d3625e	555	dev_err(glue->dev, "can't register platform device\n");
0969d679 FB	556	goto out_dev_put;
	557	}
	558
2d5e82b8 TP	559	return 0;
2d5e82b8 TP	560
0969d679 FB	561	out_dev_put:
0969d679 FB	562	platform_device_put(glue->core);
2d5e82b8 TP	563	return ret;
	564	}
	565
b74324d1	566	static int wl1271_remove(struct spi_device *spi)
2d5e82b8	567	{
b65019f6	568	struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
2d5e82b8	569
ca6dc103	570	platform_device_unregister(glue->core);
2d5e82b8 TP	571
	572	return 0;
	573	}
	574
2d5e82b8 TP	575	static struct spi_driver wl1271_spi_driver = {
2d5e82b8 TP	576	.driver = {
7fdd50d0	577	.name = "wl1271_spi",
04654c38	578	.of_match_table = of_match_ptr(wlcore_spi_of_match_table),
2d5e82b8 TP	579	},
	580
	581	.probe = wl1271_probe,
b74324d1	582	.remove = wl1271_remove,
2d5e82b8 TP	583	};
2d5e82b8 TP	584
d5a49178	585	module_spi_driver(wl1271_spi_driver);
2d5e82b8	586	MODULE_LICENSE("GPL");
5245e3a9	587	MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
2d5e82b8	588	MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
f148cfdd	589	MODULE_ALIAS("spi:wl1271");