/*
* 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/crc7.h>
#include <linux/spi/spi.h>
#include <linux/wl12xx.h>
#include <linux/platform_device.h>
#include <linux/slab.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)
#define WSPI_MAX_NUM_OF_CHUNKS (SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE)
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);
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) {
dev_err(child->parent,
"could not allocate cmd for spi init\n");
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(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((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);
struct spi_transfer t[2 * (WSPI_MAX_NUM_OF_CHUNKS + 1)];
struct spi_message m;
u32 commands[WSPI_MAX_NUM_OF_CHUNKS];
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((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 = -ENOMEM;
pdev_data = kzalloc(sizeof(*pdev_data), GFP_KERNEL);
if (!pdev_data)
goto out;
pdev_data->pdata = dev_get_platdata(&spi->dev);
if (!pdev_data->pdata) {
dev_err(&spi->dev, "no platform data\n");
ret = -ENODEV;
goto out_free_pdev_data;
}
pdev_data->if_ops = &spi_ops;
glue = kzalloc(sizeof(*glue), GFP_KERNEL);
if (!glue) {
dev_err(&spi->dev, "can't allocate glue\n");
goto out_free_pdev_data;
}
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");
goto out_free_glue;
}
glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
if (!glue->core) {
dev_err(glue->dev, "can't allocate platform_device\n");
ret = -ENOMEM;
goto out_free_glue;
}
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);
out_free_glue:
kfree(glue);
out_free_pdev_data:
kfree(pdev_data);
out:
return ret;
}
static int wl1271_remove(struct spi_device *spi)
{
struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
platform_device_unregister(glue->core);
kfree(glue);
return 0;
}
static struct spi_driver wl1271_spi_driver = {
.driver = {
.name = "wl1271_spi",
.owner = THIS_MODULE,
},
.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");