satip-axe/kernel/drivers/net/wireless/p54/p54spi.c

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/*
* Copyright (C) 2008 Christian Lamparter <chunkeey@web.de>
* Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
*
* This driver is a port from stlc45xx:
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
*
* 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/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/spi/spi.h>
#include <linux/etherdevice.h>
#include <linux/gpio.h>
#include "p54spi.h"
#include "p54spi_eeprom.h"
#include "p54.h"
#include "lmac.h"
MODULE_FIRMWARE("3826.arm");
MODULE_ALIAS("stlc45xx");
/*
* gpios should be handled in board files and provided via platform data,
* but because it's currently impossible for p54spi to have a header file
* in include/linux, let's use module paramaters for now
*/
static int p54spi_gpio_power = 97;
module_param(p54spi_gpio_power, int, 0444);
MODULE_PARM_DESC(p54spi_gpio_power, "gpio number for power line");
static int p54spi_gpio_irq = 87;
module_param(p54spi_gpio_irq, int, 0444);
MODULE_PARM_DESC(p54spi_gpio_irq, "gpio number for irq line");
static void p54spi_spi_read(struct p54s_priv *priv, u8 address,
void *buf, size_t len)
{
struct spi_transfer t[2];
struct spi_message m;
__le16 addr;
/* We first push the address */
addr = cpu_to_le16(address << 8 | SPI_ADRS_READ_BIT_15);
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = &addr;
t[0].len = sizeof(addr);
spi_message_add_tail(&t[0], &m);
t[1].rx_buf = buf;
t[1].len = len;
spi_message_add_tail(&t[1], &m);
spi_sync(priv->spi, &m);
}
static void p54spi_spi_write(struct p54s_priv *priv, u8 address,
const void *buf, size_t len)
{
struct spi_transfer t[3];
struct spi_message m;
__le16 addr;
/* We first push the address */
addr = cpu_to_le16(address << 8);
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = &addr;
t[0].len = sizeof(addr);
spi_message_add_tail(&t[0], &m);
t[1].tx_buf = buf;
t[1].len = len & ~1;
spi_message_add_tail(&t[1], &m);
if (len % 2) {
__le16 last_word;
last_word = cpu_to_le16(((u8 *)buf)[len - 1]);
t[2].tx_buf = &last_word;
t[2].len = sizeof(last_word);
spi_message_add_tail(&t[2], &m);
}
spi_sync(priv->spi, &m);
}
static u32 p54spi_read32(struct p54s_priv *priv, u8 addr)
{
__le32 val;
p54spi_spi_read(priv, addr, &val, sizeof(val));
return le32_to_cpu(val);
}
static inline void p54spi_write16(struct p54s_priv *priv, u8 addr, __le16 val)
{
p54spi_spi_write(priv, addr, &val, sizeof(val));
}
static inline void p54spi_write32(struct p54s_priv *priv, u8 addr, __le32 val)
{
p54spi_spi_write(priv, addr, &val, sizeof(val));
}
static int p54spi_wait_bit(struct p54s_priv *priv, u16 reg, u32 bits)
{
int i;
for (i = 0; i < 2000; i++) {
u32 buffer = p54spi_read32(priv, reg);
if ((buffer & bits) == bits)
return 1;
}
return 0;
}
static int p54spi_spi_write_dma(struct p54s_priv *priv, __le32 base,
const void *buf, size_t len)
{
if (!p54spi_wait_bit(priv, SPI_ADRS_DMA_WRITE_CTRL, HOST_ALLOWED)) {
dev_err(&priv->spi->dev, "spi_write_dma not allowed "
"to DMA write.\n");
return -EAGAIN;
}
p54spi_write16(priv, SPI_ADRS_DMA_WRITE_CTRL,
cpu_to_le16(SPI_DMA_WRITE_CTRL_ENABLE));
p54spi_write16(priv, SPI_ADRS_DMA_WRITE_LEN, cpu_to_le16(len));
p54spi_write32(priv, SPI_ADRS_DMA_WRITE_BASE, base);
p54spi_spi_write(priv, SPI_ADRS_DMA_DATA, buf, len);
return 0;
}
static int p54spi_request_firmware(struct ieee80211_hw *dev)
{
struct p54s_priv *priv = dev->priv;
int ret;
/* FIXME: should driver use it's own struct device? */
ret = request_firmware(&priv->firmware, "3826.arm", &priv->spi->dev);
if (ret < 0) {
dev_err(&priv->spi->dev, "request_firmware() failed: %d", ret);
return ret;
}
ret = p54_parse_firmware(dev, priv->firmware);
if (ret) {
release_firmware(priv->firmware);
return ret;
}
return 0;
}
static int p54spi_request_eeprom(struct ieee80211_hw *dev)
{
struct p54s_priv *priv = dev->priv;
const struct firmware *eeprom;
int ret;
/*
* allow users to customize their eeprom.
*/
ret = request_firmware(&eeprom, "3826.eeprom", &priv->spi->dev);
if (ret < 0) {
dev_info(&priv->spi->dev, "loading default eeprom...\n");
ret = p54_parse_eeprom(dev, (void *) p54spi_eeprom,
sizeof(p54spi_eeprom));
} else {
dev_info(&priv->spi->dev, "loading user eeprom...\n");
ret = p54_parse_eeprom(dev, (void *) eeprom->data,
(int)eeprom->size);
release_firmware(eeprom);
}
return ret;
}
static int p54spi_upload_firmware(struct ieee80211_hw *dev)
{
struct p54s_priv *priv = dev->priv;
unsigned long fw_len, _fw_len;
unsigned int offset = 0;
int err = 0;
u8 *fw;
fw_len = priv->firmware->size;
fw = kmemdup(priv->firmware->data, fw_len, GFP_KERNEL);
if (!fw)
return -ENOMEM;
/* stop the device */
p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
SPI_CTRL_STAT_START_HALTED));
msleep(TARGET_BOOT_SLEEP);
p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
SPI_CTRL_STAT_HOST_OVERRIDE |
SPI_CTRL_STAT_START_HALTED));
msleep(TARGET_BOOT_SLEEP);
while (fw_len > 0) {
_fw_len = min_t(long, fw_len, SPI_MAX_PACKET_SIZE);
err = p54spi_spi_write_dma(priv, cpu_to_le32(
ISL38XX_DEV_FIRMWARE_ADDR + offset),
(fw + offset), _fw_len);
if (err < 0)
goto out;
fw_len -= _fw_len;
offset += _fw_len;
}
BUG_ON(fw_len != 0);
/* enable host interrupts */
p54spi_write32(priv, SPI_ADRS_HOST_INT_EN,
cpu_to_le32(SPI_HOST_INTS_DEFAULT));
/* boot the device */
p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_HOST_RESET |
SPI_CTRL_STAT_RAM_BOOT));
msleep(TARGET_BOOT_SLEEP);
p54spi_write16(priv, SPI_ADRS_DEV_CTRL_STAT, cpu_to_le16(
SPI_CTRL_STAT_HOST_OVERRIDE | SPI_CTRL_STAT_RAM_BOOT));
msleep(TARGET_BOOT_SLEEP);
out:
kfree(fw);
return err;
}
static void p54spi_power_off(struct p54s_priv *priv)
{
disable_irq(gpio_to_irq(p54spi_gpio_irq));
gpio_set_value(p54spi_gpio_power, 0);
}
static void p54spi_power_on(struct p54s_priv *priv)
{
gpio_set_value(p54spi_gpio_power, 1);
enable_irq(gpio_to_irq(p54spi_gpio_irq));
/*
* need to wait a while before device can be accessed, the lenght
* is just a guess
*/
msleep(10);
}
static inline void p54spi_int_ack(struct p54s_priv *priv, u32 val)
{
p54spi_write32(priv, SPI_ADRS_HOST_INT_ACK, cpu_to_le32(val));
}
static int p54spi_wakeup(struct p54s_priv *priv)
{
/* wake the chip */
p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
cpu_to_le32(SPI_TARGET_INT_WAKEUP));
/* And wait for the READY interrupt */
if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
SPI_HOST_INT_READY)) {
dev_err(&priv->spi->dev, "INT_READY timeout\n");
return -EBUSY;
}
p54spi_int_ack(priv, SPI_HOST_INT_READY);
return 0;
}
static inline void p54spi_sleep(struct p54s_priv *priv)
{
p54spi_write32(priv, SPI_ADRS_ARM_INTERRUPTS,
cpu_to_le32(SPI_TARGET_INT_SLEEP));
}
static void p54spi_int_ready(struct p54s_priv *priv)
{
p54spi_write32(priv, SPI_ADRS_HOST_INT_EN, cpu_to_le32(
SPI_HOST_INT_UPDATE | SPI_HOST_INT_SW_UPDATE));
switch (priv->fw_state) {
case FW_STATE_BOOTING:
priv->fw_state = FW_STATE_READY;
complete(&priv->fw_comp);
break;
case FW_STATE_RESETTING:
priv->fw_state = FW_STATE_READY;
/* TODO: reinitialize state */
break;
default:
break;
}
}
static int p54spi_rx(struct p54s_priv *priv)
{
struct sk_buff *skb;
u16 len;
u16 rx_head[2];
#define READAHEAD_SZ (sizeof(rx_head)-sizeof(u16))
if (p54spi_wakeup(priv) < 0)
return -EBUSY;
/* Read data size and first data word in one SPI transaction
* This is workaround for firmware/DMA bug,
* when first data word gets lost under high load.
*/
p54spi_spi_read(priv, SPI_ADRS_DMA_DATA, rx_head, sizeof(rx_head));
len = rx_head[0];
if (len == 0) {
p54spi_sleep(priv);
dev_err(&priv->spi->dev, "rx request of zero bytes\n");
return 0;
}
/* Firmware may insert up to 4 padding bytes after the lmac header,
* but it does not amend the size of SPI data transfer.
* Such packets has correct data size in header, thus referencing
* past the end of allocated skb. Reserve extra 4 bytes for this case */
skb = dev_alloc_skb(len + 4);
if (!skb) {
p54spi_sleep(priv);
dev_err(&priv->spi->dev, "could not alloc skb");
return -ENOMEM;
}
if (len <= READAHEAD_SZ) {
memcpy(skb_put(skb, len), rx_head + 1, len);
} else {
memcpy(skb_put(skb, READAHEAD_SZ), rx_head + 1, READAHEAD_SZ);
p54spi_spi_read(priv, SPI_ADRS_DMA_DATA,
skb_put(skb, len - READAHEAD_SZ),
len - READAHEAD_SZ);
}
p54spi_sleep(priv);
/* Put additional bytes to compensate for the possible
* alignment-caused truncation */
skb_put(skb, 4);
if (p54_rx(priv->hw, skb) == 0)
dev_kfree_skb(skb);
return 0;
}
static irqreturn_t p54spi_interrupt(int irq, void *config)
{
struct spi_device *spi = config;
struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
ieee80211_queue_work(priv->hw, &priv->work);
return IRQ_HANDLED;
}
static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
{
struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
int ret = 0;
if (p54spi_wakeup(priv) < 0)
return -EBUSY;
ret = p54spi_spi_write_dma(priv, hdr->req_id, skb->data, skb->len);
if (ret < 0)
goto out;
if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
SPI_HOST_INT_WR_READY)) {
dev_err(&priv->spi->dev, "WR_READY timeout\n");
ret = -EAGAIN;
goto out;
}
p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
if (FREE_AFTER_TX(skb))
p54_free_skb(priv->hw, skb);
out:
p54spi_sleep(priv);
return ret;
}
static int p54spi_wq_tx(struct p54s_priv *priv)
{
struct p54s_tx_info *entry;
struct sk_buff *skb;
struct ieee80211_tx_info *info;
struct p54_tx_info *minfo;
struct p54s_tx_info *dinfo;
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&priv->tx_lock, flags);
while (!list_empty(&priv->tx_pending)) {
entry = list_entry(priv->tx_pending.next,
struct p54s_tx_info, tx_list);
list_del_init(&entry->tx_list);
spin_unlock_irqrestore(&priv->tx_lock, flags);
dinfo = container_of((void *) entry, struct p54s_tx_info,
tx_list);
minfo = container_of((void *) dinfo, struct p54_tx_info,
data);
info = container_of((void *) minfo, struct ieee80211_tx_info,
rate_driver_data);
skb = container_of((void *) info, struct sk_buff, cb);
ret = p54spi_tx_frame(priv, skb);
if (ret < 0) {
p54_free_skb(priv->hw, skb);
return ret;
}
spin_lock_irqsave(&priv->tx_lock, flags);
}
spin_unlock_irqrestore(&priv->tx_lock, flags);
return ret;
}
static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
{
struct p54s_priv *priv = dev->priv;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
unsigned long flags;
BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));
spin_lock_irqsave(&priv->tx_lock, flags);
list_add_tail(&di->tx_list, &priv->tx_pending);
spin_unlock_irqrestore(&priv->tx_lock, flags);
ieee80211_queue_work(priv->hw, &priv->work);
}
static void p54spi_work(struct work_struct *work)
{
struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
u32 ints;
int ret;
mutex_lock(&priv->mutex);
if (priv->fw_state == FW_STATE_OFF)
goto out;
ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);
if (ints & SPI_HOST_INT_READY) {
p54spi_int_ready(priv);
p54spi_int_ack(priv, SPI_HOST_INT_READY);
}
if (priv->fw_state != FW_STATE_READY)
goto out;
if (ints & SPI_HOST_INT_UPDATE) {
p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
ret = p54spi_rx(priv);
if (ret < 0)
goto out;
}
if (ints & SPI_HOST_INT_SW_UPDATE) {
p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
ret = p54spi_rx(priv);
if (ret < 0)
goto out;
}
ret = p54spi_wq_tx(priv);
out:
mutex_unlock(&priv->mutex);
}
static int p54spi_op_start(struct ieee80211_hw *dev)
{
struct p54s_priv *priv = dev->priv;
unsigned long timeout;
int ret = 0;
if (mutex_lock_interruptible(&priv->mutex)) {
ret = -EINTR;
goto out;
}
priv->fw_state = FW_STATE_BOOTING;
p54spi_power_on(priv);
ret = p54spi_upload_firmware(dev);
if (ret < 0) {
p54spi_power_off(priv);
goto out_unlock;
}
mutex_unlock(&priv->mutex);
timeout = msecs_to_jiffies(2000);
timeout = wait_for_completion_interruptible_timeout(&priv->fw_comp,
timeout);
if (!timeout) {
dev_err(&priv->spi->dev, "firmware boot failed");
p54spi_power_off(priv);
ret = -1;
goto out;
}
if (mutex_lock_interruptible(&priv->mutex)) {
ret = -EINTR;
p54spi_power_off(priv);
goto out;
}
WARN_ON(priv->fw_state != FW_STATE_READY);
out_unlock:
mutex_unlock(&priv->mutex);
out:
return ret;
}
static void p54spi_op_stop(struct ieee80211_hw *dev)
{
struct p54s_priv *priv = dev->priv;
unsigned long flags;
if (mutex_lock_interruptible(&priv->mutex)) {
/* FIXME: how to handle this error? */
return;
}
WARN_ON(priv->fw_state != FW_STATE_READY);
cancel_work_sync(&priv->work);
p54spi_power_off(priv);
spin_lock_irqsave(&priv->tx_lock, flags);
INIT_LIST_HEAD(&priv->tx_pending);
spin_unlock_irqrestore(&priv->tx_lock, flags);
priv->fw_state = FW_STATE_OFF;
mutex_unlock(&priv->mutex);
}
static int __devinit p54spi_probe(struct spi_device *spi)
{
struct p54s_priv *priv = NULL;
struct ieee80211_hw *hw;
int ret = -EINVAL;
hw = p54_init_common(sizeof(*priv));
if (!hw) {
dev_err(&spi->dev, "could not alloc ieee80211_hw");
return -ENOMEM;
}
priv = hw->priv;
priv->hw = hw;
dev_set_drvdata(&spi->dev, priv);
priv->spi = spi;
spi->bits_per_word = 16;
spi->max_speed_hz = 24000000;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&priv->spi->dev, "spi_setup failed");
goto err_free_common;
}
ret = gpio_request(p54spi_gpio_power, "p54spi power");
if (ret < 0) {
dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
goto err_free_common;
}
ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
if (ret < 0) {
dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
goto err_free_common;
}
gpio_direction_output(p54spi_gpio_power, 0);
gpio_direction_input(p54spi_gpio_irq);
ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
p54spi_interrupt, IRQF_DISABLED, "p54spi",
priv->spi);
if (ret < 0) {
dev_err(&priv->spi->dev, "request_irq() failed");
goto err_free_common;
}
set_irq_type(gpio_to_irq(p54spi_gpio_irq),
IRQ_TYPE_EDGE_RISING);
disable_irq(gpio_to_irq(p54spi_gpio_irq));
INIT_WORK(&priv->work, p54spi_work);
init_completion(&priv->fw_comp);
INIT_LIST_HEAD(&priv->tx_pending);
mutex_init(&priv->mutex);
SET_IEEE80211_DEV(hw, &spi->dev);
priv->common.open = p54spi_op_start;
priv->common.stop = p54spi_op_stop;
priv->common.tx = p54spi_op_tx;
ret = p54spi_request_firmware(hw);
if (ret < 0)
goto err_free_common;
ret = p54spi_request_eeprom(hw);
if (ret)
goto err_free_common;
ret = p54_register_common(hw, &priv->spi->dev);
if (ret)
goto err_free_common;
return 0;
err_free_common:
p54_free_common(priv->hw);
return ret;
}
static int __devexit p54spi_remove(struct spi_device *spi)
{
struct p54s_priv *priv = dev_get_drvdata(&spi->dev);
p54_unregister_common(priv->hw);
free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
gpio_free(p54spi_gpio_power);
gpio_free(p54spi_gpio_irq);
release_firmware(priv->firmware);
mutex_destroy(&priv->mutex);
p54_free_common(priv->hw);
return 0;
}
static struct spi_driver p54spi_driver = {
.driver = {
/* use cx3110x name because board-n800.c uses that for the
* SPI port */
.name = "cx3110x",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = p54spi_probe,
.remove = __devexit_p(p54spi_remove),
};
static int __init p54spi_init(void)
{
int ret;
ret = spi_register_driver(&p54spi_driver);
if (ret < 0) {
printk(KERN_ERR "failed to register SPI driver: %d", ret);
goto out;
}
out:
return ret;
}
static void __exit p54spi_exit(void)
{
spi_unregister_driver(&p54spi_driver);
}
module_init(p54spi_init);
module_exit(p54spi_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Lamparter <chunkeey@web.de>");
MODULE_ALIAS("spi:cx3110x");