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// SPDX-License-Identifier: GPL-2.0-only
/*
* This file is part of wl1271
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
*/
#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 * 4K) compared to
* (4 * 4K) for wl12xx, so use the larger buffer needed for wl18xx
*/
#define SPI_AGGR_BUFFER_SIZE (13 * SZ_4K)
/* 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",
.nvs_name = "ti-connectivity/wl1271-nvs.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);
}
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 configuration 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)
{
/* 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)
__wl12xx_spi_raw_write(child, addr, buf, len, fixed);
return __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
}
/**
* 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 = &wl127x_data},
{ .compatible = "ti,wl1273", .data = &wl127x_data},
{ .compatible = "ti,wl1281", .data = &wl128x_data},
{ .compatible = "ti,wl1283", .data = &wl128x_data},
{ .compatible = "ti,wl1285", .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;
}
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;
}
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");
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