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#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/cdev.h>
#include <linux/uaccess.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include "linux_wlan_common.h"
#include "linux_wlan_spi.h"
#define USE_SPI_DMA 0 /* johnny add */
#ifdef WILC_ASIC_A0
#if defined(PLAT_PANDA_ES_OMAP4460)
#define MIN_SPEED 12000000
#define MAX_SPEED 24000000
#elif defined(PLAT_WMS8304)
#define MIN_SPEED 12000000
#define MAX_SPEED 24000000 /* 4000000 */
#elif defined(CUSTOMER_PLATFORM)
/*
TODO : define Clock speed under 48M.
*
* ex)
* #define MIN_SPEED 24000000
* #define MAX_SPEED 48000000
*/
#else
#define MIN_SPEED 24000000
#define MAX_SPEED 48000000
#endif
#else /* WILC_ASIC_A0 */
/* Limit clk to 6MHz on FPGA. */
#define MIN_SPEED 6000000
#define MAX_SPEED 6000000
#endif /* WILC_ASIC_A0 */
static u32 SPEED = MIN_SPEED;
struct spi_device *wilc_spi_dev;
void linux_spi_deinit(void *vp);
static int __init wilc_bus_probe(struct spi_device *spi)
{
PRINT_D(BUS_DBG, "spiModalias: %s\n", spi->modalias);
PRINT_D(BUS_DBG, "spiMax-Speed: %d\n", spi->max_speed_hz);
wilc_spi_dev = spi;
printk("Driver Initializing success\n");
return 0;
}
static int __exit wilc_bus_remove(struct spi_device *spi)
{
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id wilc1000_of_match[] = {
{ .compatible = "atmel,wilc_spi", },
{}
};
MODULE_DEVICE_TABLE(of, wilc1000_of_match);
#endif
struct spi_driver wilc_bus __refdata = {
.driver = {
.name = MODALIAS,
#ifdef CONFIG_OF
.of_match_table = wilc1000_of_match,
#endif
},
.probe = wilc_bus_probe,
.remove = __exit_p(wilc_bus_remove),
};
void linux_spi_deinit(void *vp)
{
spi_unregister_driver(&wilc_bus);
SPEED = MIN_SPEED;
PRINT_ER("@@@@@@@@@@@@ restore SPI speed to %d @@@@@@@@@\n", SPEED);
}
int linux_spi_init(void)
{
int ret = 1;
static int called;
if (called == 0) {
called++;
ret = spi_register_driver(&wilc_bus);
}
/* change return value to match WILC interface */
(ret < 0) ? (ret = 0) : (ret = 1);
return ret;
}
#if defined(PLAT_WMS8304)
#define TXRX_PHASE_SIZE (4096)
#endif
#if defined(TXRX_PHASE_SIZE)
int linux_spi_write(u8 *b, u32 len)
{
int ret;
if (len > 0 && b != NULL) {
int i = 0;
int blk = len / TXRX_PHASE_SIZE;
int remainder = len % TXRX_PHASE_SIZE;
char *r_buffer = kzalloc(TXRX_PHASE_SIZE, GFP_KERNEL);
if (!r_buffer)
return -ENOMEM;
if (blk) {
while (i < blk) {
struct spi_message msg;
struct spi_transfer tr = {
.tx_buf = b + (i * TXRX_PHASE_SIZE),
.len = TXRX_PHASE_SIZE,
.speed_hz = SPEED,
.bits_per_word = 8,
.delay_usecs = 0,
};
tr.rx_buf = r_buffer;
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA;
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
i++;
}
}
if (remainder) {
struct spi_message msg;
struct spi_transfer tr = {
.tx_buf = b + (blk * TXRX_PHASE_SIZE),
.len = remainder,
.speed_hz = SPEED,
.bits_per_word = 8,
.delay_usecs = 0,
};
tr.rx_buf = r_buffer;
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA; /* rachel */
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
}
kfree(r_buffer);
} else {
PRINT_ER("can't write data with the following length: %d\n", len);
PRINT_ER("FAILED due to NULL buffer or ZERO length check the following length: %d\n", len);
ret = -1;
}
/* change return value to match WILC interface */
(ret < 0) ? (ret = 0) : (ret = 1);
return ret;
}
#else
int linux_spi_write(u8 *b, u32 len)
{
int ret;
struct spi_message msg;
if (len > 0 && b != NULL) {
struct spi_transfer tr = {
.tx_buf = b,
.len = len,
.speed_hz = SPEED,
.delay_usecs = 0,
};
char *r_buffer = kzalloc(len, GFP_KERNEL);
if (!r_buffer)
return -ENOMEM;
tr.rx_buf = r_buffer;
PRINT_D(BUS_DBG, "Request writing %d bytes\n", len);
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
/* [[johnny add */
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA;
/* ]] */
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
kfree(r_buffer);
} else {
PRINT_ER("can't write data with the following length: %d\n", len);
PRINT_ER("FAILED due to NULL buffer or ZERO length check the following length: %d\n", len);
ret = -1;
}
/* change return value to match WILC interface */
(ret < 0) ? (ret = 0) : (ret = 1);
return ret;
}
#endif
#if defined(TXRX_PHASE_SIZE)
int linux_spi_read(u8 *rb, u32 rlen)
{
int ret;
if (rlen > 0) {
int i = 0;
int blk = rlen / TXRX_PHASE_SIZE;
int remainder = rlen % TXRX_PHASE_SIZE;
char *t_buffer = kzalloc(TXRX_PHASE_SIZE, GFP_KERNEL);
if (!t_buffer)
return -ENOMEM;
if (blk) {
while (i < blk) {
struct spi_message msg;
struct spi_transfer tr = {
.rx_buf = rb + (i * TXRX_PHASE_SIZE),
.len = TXRX_PHASE_SIZE,
.speed_hz = SPEED,
.bits_per_word = 8,
.delay_usecs = 0,
};
tr.tx_buf = t_buffer;
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA;
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
i++;
}
}
if (remainder) {
struct spi_message msg;
struct spi_transfer tr = {
.rx_buf = rb + (blk * TXRX_PHASE_SIZE),
.len = remainder,
.speed_hz = SPEED,
.bits_per_word = 8,
.delay_usecs = 0,
};
tr.tx_buf = t_buffer;
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA; /* rachel */
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
}
kfree(t_buffer);
} else {
PRINT_ER("can't read data with the following length: %u\n", rlen);
ret = -1;
}
/* change return value to match WILC interface */
(ret < 0) ? (ret = 0) : (ret = 1);
return ret;
}
#else
int linux_spi_read(u8 *rb, u32 rlen)
{
int ret;
if (rlen > 0) {
struct spi_message msg;
struct spi_transfer tr = {
.rx_buf = rb,
.len = rlen,
.speed_hz = SPEED,
.delay_usecs = 0,
};
char *t_buffer = kzalloc(rlen, GFP_KERNEL);
if (!t_buffer)
return -ENOMEM;
tr.tx_buf = t_buffer;
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
/* [[ johnny add */
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA;
/* ]] */
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
kfree(t_buffer);
} else {
PRINT_ER("can't read data with the following length: %u\n", rlen);
ret = -1;
}
/* change return value to match WILC interface */
(ret < 0) ? (ret = 0) : (ret = 1);
return ret;
}
#endif
int linux_spi_write_read(u8 *wb, u8 *rb, u32 rlen)
{
int ret;
if (rlen > 0) {
struct spi_message msg;
struct spi_transfer tr = {
.rx_buf = rb,
.tx_buf = wb,
.len = rlen,
.speed_hz = SPEED,
.bits_per_word = 8,
.delay_usecs = 0,
};
memset(&msg, 0, sizeof(msg));
spi_message_init(&msg);
msg.spi = wilc_spi_dev;
msg.is_dma_mapped = USE_SPI_DMA;
spi_message_add_tail(&tr, &msg);
ret = spi_sync(wilc_spi_dev, &msg);
if (ret < 0) {
PRINT_ER("SPI transaction failed\n");
}
} else {
PRINT_ER("can't read data with the following length: %u\n", rlen);
ret = -1;
}
/* change return value to match WILC interface */
(ret < 0) ? (ret = 0) : (ret = 1);
return ret;
}
int linux_spi_set_max_speed(void)
{
SPEED = MAX_SPEED;
PRINT_INFO(BUS_DBG, "@@@@@@@@@@@@ change SPI speed to %d @@@@@@@@@\n", SPEED);
return 1;
}
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