Release 4.11 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)


static const struct wilink_family_data wl127x_data = {
	.name = "wl127x",
	.nvs_name = "ti-connectivity/wl127x-nvs.bin",
};


static const struct wilink_family_data wl128x_data = {
	.name = "wl128x",
	.nvs_name = "ti-connectivity/wl128x-nvs.bin",
};


static const struct wilink_family_data wl18xx_data = {
	.name = "wl18xx",
	.cfg_name = "ti-connectivity/wl18xx-conf.bin",
};


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);
}

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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);
}

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2
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Felipe Balbi
19
5.22%
2
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#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;
}

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2.94%
1
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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;
}

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22.91%
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Ido Yariv
49
13.21%
3
27.27%
Felipe Balbi
35
9.43%
2
18.18%
Teemu Paasikivi
3
0.81%
2
18.18%
Silvan Jegen
2
0.54%
1
9.09%
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371
100.00%
11
100.00%



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;
}

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34
12.27%
1
10.00%
Felipe Balbi
18
6.50%
2
20.00%
Silvan Jegen
2
0.72%
1
10.00%
Uri Mashiach
1
0.36%
1
10.00%
Teemu Paasikivi
1
0.36%
1
10.00%
Arik Nemtsov
1
0.36%
1
10.00%
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277
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10
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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;
}

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/**
 * 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;
}

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/**
 * 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)
{
}

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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 = &wl127x_data},
	{ .compatible = "ti,wl1273", .data = &wl127x_data},
	{ .compatible = "ti,wl1281", .data = &wl128x_data},
	{ .compatible = "ti,wl1283", .data = &wl128x_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;

	pdev_data->family = of_id->data;
	dev_info(&spi->dev, "selected chip family is %s\n",
		 pdev_data->family->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;
}

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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;

	pdev_data = devm_kzalloc(&spi->dev, sizeof(*pdev_data), GFP_KERNEL);
	if (!pdev_data)
		return -ENOMEM;

	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(pdev_data->family->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;
}

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

	platform_device_unregister(glue->core);

	return 0;
}

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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");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Luciano Coelho
674
26.25%
9
21.43%
Eyal Reizer
429
16.71%
1
2.38%
Felipe Balbi
358
13.94%
3
7.14%
Uri Mashiach
313
12.19%
3
7.14%
Teemu Paasikivi
247
9.62%
4
9.52%
Juuso Oikarinen
225
8.76%
2
4.76%
Ido Yariv
146
5.69%
3
7.14%
Tony Lindgren
65
2.53%
2
4.76%
George Spelvin
61
2.38%
2
4.76%
Himangi Saraogi
15
0.58%
1
2.38%
Vasiliy Kulikov
5
0.19%
1
2.38%
Dan Carpenter
5
0.19%
1
2.38%
Ameya Palande
5
0.19%
1
2.38%
Silvan Jegen
4
0.16%
1
2.38%
Arik Nemtsov
4
0.16%
1
2.38%
Alexey Dobriyan
3
0.12%
1
2.38%
Christian Engelmayer
2
0.08%
1
2.38%
Wei Yongjun
2
0.08%
2
4.76%
Tejun Heo
2
0.08%
1
2.38%
Peter Hüwe
2
0.08%
1
2.38%
Shahar Levi
1
0.04%
1
2.38%
Total
2568
100.00%
42
100.00%
Directory: drivers/net/wireless/ti/wlcore

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