- 根目录:
- drivers
- staging
- gdm72xx
- gdm_sdio.c
/*
* Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mmc/core.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include "gdm_sdio.h"
#include "gdm_wimax.h"
#include "sdio_boot.h"
#include "hci.h"
#define TYPE_A_HEADER_SIZE 4
#define TYPE_A_LOOKAHEAD_SIZE 16
#define MAX_NR_RX_BUF 4
#define SDU_TX_BUF_SIZE 2048
#define TX_BUF_SIZE 2048
#define TX_CHUNK_SIZE (2048 - TYPE_A_HEADER_SIZE)
#define RX_BUF_SIZE (25*1024)
#define TX_HZ 2000
#define TX_INTERVAL (1000000/TX_HZ)
static struct sdio_tx *alloc_tx_struct(struct tx_cxt *tx)
{
struct sdio_tx *t = kzalloc(sizeof(*t), GFP_ATOMIC);
if (!t)
return NULL;
t->buf = kmalloc(TX_BUF_SIZE, GFP_ATOMIC);
if (!t->buf) {
kfree(t);
return NULL;
}
t->tx_cxt = tx;
return t;
}
static void free_tx_struct(struct sdio_tx *t)
{
if (t) {
kfree(t->buf);
kfree(t);
}
}
static struct sdio_rx *alloc_rx_struct(struct rx_cxt *rx)
{
struct sdio_rx *r = kzalloc(sizeof(*r), GFP_ATOMIC);
if (r)
r->rx_cxt = rx;
return r;
}
static void free_rx_struct(struct sdio_rx *r)
{
kfree(r);
}
/* Before this function is called, spin lock should be locked. */
static struct sdio_tx *get_tx_struct(struct tx_cxt *tx, int *no_spc)
{
struct sdio_tx *t;
if (list_empty(&tx->free_list))
return NULL;
t = list_entry(tx->free_list.prev, struct sdio_tx, list);
list_del(&t->list);
*no_spc = list_empty(&tx->free_list) ? 1 : 0;
return t;
}
/* Before this function is called, spin lock should be locked. */
static void put_tx_struct(struct tx_cxt *tx, struct sdio_tx *t)
{
list_add_tail(&t->list, &tx->free_list);
}
/* Before this function is called, spin lock should be locked. */
static struct sdio_rx *get_rx_struct(struct rx_cxt *rx)
{
struct sdio_rx *r;
if (list_empty(&rx->free_list))
return NULL;
r = list_entry(rx->free_list.prev, struct sdio_rx, list);
list_del(&r->list);
return r;
}
/* Before this function is called, spin lock should be locked. */
static void put_rx_struct(struct rx_cxt *rx, struct sdio_rx *r)
{
list_add_tail(&r->list, &rx->free_list);
}
static void release_sdio(struct sdiowm_dev *sdev)
{
struct tx_cxt *tx = &sdev->tx;
struct rx_cxt *rx = &sdev->rx;
struct sdio_tx *t, *t_next;
struct sdio_rx *r, *r_next;
kfree(tx->sdu_buf);
list_for_each_entry_safe(t, t_next, &tx->free_list, list) {
list_del(&t->list);
free_tx_struct(t);
}
list_for_each_entry_safe(t, t_next, &tx->sdu_list, list) {
list_del(&t->list);
free_tx_struct(t);
}
list_for_each_entry_safe(t, t_next, &tx->hci_list, list) {
list_del(&t->list);
free_tx_struct(t);
}
kfree(rx->rx_buf);
list_for_each_entry_safe(r, r_next, &rx->free_list, list) {
list_del(&r->list);
free_rx_struct(r);
}
list_for_each_entry_safe(r, r_next, &rx->req_list, list) {
list_del(&r->list);
free_rx_struct(r);
}
}
static int init_sdio(struct sdiowm_dev *sdev)
{
int ret = 0, i;
struct tx_cxt *tx = &sdev->tx;
struct rx_cxt *rx = &sdev->rx;
struct sdio_tx *t;
struct sdio_rx *r;
INIT_LIST_HEAD(&tx->free_list);
INIT_LIST_HEAD(&tx->sdu_list);
INIT_LIST_HEAD(&tx->hci_list);
spin_lock_init(&tx->lock);
tx->sdu_buf = kmalloc(SDU_TX_BUF_SIZE, GFP_KERNEL);
if (tx->sdu_buf == NULL)
goto fail;
for (i = 0; i < MAX_NR_SDU_BUF; i++) {
t = alloc_tx_struct(tx);
if (t == NULL) {
ret = -ENOMEM;
goto fail;
}
list_add(&t->list, &tx->free_list);
}
INIT_LIST_HEAD(&rx->free_list);
INIT_LIST_HEAD(&rx->req_list);
spin_lock_init(&rx->lock);
for (i = 0; i < MAX_NR_RX_BUF; i++) {
r = alloc_rx_struct(rx);
if (r == NULL) {
ret = -ENOMEM;
goto fail;
}
list_add(&r->list, &rx->free_list);
}
rx->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
if (rx->rx_buf == NULL)
goto fail;
return 0;
fail:
release_sdio(sdev);
return ret;
}
static void send_sdio_pkt(struct sdio_func *func, u8 *data, int len)
{
int n, blocks, ret, remain;
sdio_claim_host(func);
blocks = len / func->cur_blksize;
n = blocks * func->cur_blksize;
if (blocks) {
ret = sdio_memcpy_toio(func, 0, data, n);
if (ret < 0) {
if (ret != -ENOMEDIUM)
dev_err(&func->dev,
"gdmwms: %s error: ret = %d\n",
__func__, ret);
goto end_io;
}
}
remain = len - n;
remain = (remain + 3) & ~3;
if (remain) {
ret = sdio_memcpy_toio(func, 0, data + n, remain);
if (ret < 0) {
if (ret != -ENOMEDIUM)
dev_err(&func->dev,
"gdmwms: %s error: ret = %d\n",
__func__, ret);
goto end_io;
}
}
end_io:
sdio_release_host(func);
}
static void send_sdu(struct sdio_func *func, struct tx_cxt *tx)
{
struct list_head *l, *next;
struct hci_s *hci;
struct sdio_tx *t;
int pos, len, i, estlen, aggr_num = 0, aggr_len;
u8 *buf;
unsigned long flags;
spin_lock_irqsave(&tx->lock, flags);
pos = TYPE_A_HEADER_SIZE + HCI_HEADER_SIZE;
list_for_each_entry(t, &tx->sdu_list, list) {
estlen = ((t->len + 3) & ~3) + 4;
if ((pos + estlen) > SDU_TX_BUF_SIZE)
break;
aggr_num++;
memcpy(tx->sdu_buf + pos, t->buf, t->len);
memset(tx->sdu_buf + pos + t->len, 0, estlen - t->len);
pos += estlen;
}
aggr_len = pos;
hci = (struct hci_s *)(tx->sdu_buf + TYPE_A_HEADER_SIZE);
hci->cmd_evt = cpu_to_be16(WIMAX_TX_SDU_AGGR);
hci->length = cpu_to_be16(aggr_len - TYPE_A_HEADER_SIZE -
HCI_HEADER_SIZE);
spin_unlock_irqrestore(&tx->lock, flags);
dev_dbg(&func->dev, "sdio_send: %*ph\n", aggr_len - TYPE_A_HEADER_SIZE,
tx->sdu_buf + TYPE_A_HEADER_SIZE);
for (pos = TYPE_A_HEADER_SIZE; pos < aggr_len; pos += TX_CHUNK_SIZE) {
len = aggr_len - pos;
len = len > TX_CHUNK_SIZE ? TX_CHUNK_SIZE : len;
buf = tx->sdu_buf + pos - TYPE_A_HEADER_SIZE;
buf[0] = len & 0xff;
buf[1] = (len >> 8) & 0xff;
buf[2] = (len >> 16) & 0xff;
buf[3] = (pos + len) >= aggr_len ? 0 : 1;
send_sdio_pkt(func, buf, len + TYPE_A_HEADER_SIZE);
}
spin_lock_irqsave(&tx->lock, flags);
for (l = tx->sdu_list.next, i = 0; i < aggr_num; i++, l = next) {
next = l->next;
t = list_entry(l, struct sdio_tx, list);
if (t->callback)
t->callback(t->cb_data);
list_del(l);
put_tx_struct(t->tx_cxt, t);
}
do_gettimeofday(&tx->sdu_stamp);
spin_unlock_irqrestore(&tx->lock, flags);
}
static void send_hci(struct sdio_func *func, struct tx_cxt *tx,
struct sdio_tx *t)
{
unsigned long flags;
dev_dbg(&func->dev, "sdio_send: %*ph\n", t->len - TYPE_A_HEADER_SIZE,
t->buf + TYPE_A_HEADER_SIZE);
send_sdio_pkt(func, t->buf, t->len);
spin_lock_irqsave(&tx->lock, flags);
if (t->callback)
t->callback(t->cb_data);
free_tx_struct(t);
spin_unlock_irqrestore(&tx->lock, flags);
}
static void do_tx(struct work_struct *work)
{
struct sdiowm_dev *sdev = container_of(work, struct sdiowm_dev, ws);
struct sdio_func *func = sdev->func;
struct tx_cxt *tx = &sdev->tx;
struct sdio_tx *t = NULL;
struct timeval now, *before;
int is_sdu = 0;
long diff;
unsigned long flags;
spin_lock_irqsave(&tx->lock, flags);
if (!tx->can_send) {
spin_unlock_irqrestore(&tx->lock, flags);
return;
}
if (!list_empty(&tx->hci_list)) {
t = list_entry(tx->hci_list.next, struct sdio_tx, list);
list_del(&t->list);
is_sdu = 0;
} else if (!tx->stop_sdu_tx && !list_empty(&tx->sdu_list)) {
do_gettimeofday(&now);
before = &tx->sdu_stamp;
diff = (now.tv_sec - before->tv_sec) * 1000000 +
(now.tv_usec - before->tv_usec);
if (diff >= 0 && diff < TX_INTERVAL) {
schedule_work(&sdev->ws);
spin_unlock_irqrestore(&tx->lock, flags);
return;
}
is_sdu = 1;
}
if (!is_sdu && t == NULL) {
spin_unlock_irqrestore(&tx->lock, flags);
return;
}
tx->can_send = 0;
spin_unlock_irqrestore(&tx->lock, flags);
if (is_sdu)
send_sdu(func, tx);
else
send_hci(func, tx, t);
}
static int gdm_sdio_send(void *priv_dev, void *data, int len,
void (*cb)(void *data), void *cb_data)
{
struct sdiowm_dev *sdev = priv_dev;
struct tx_cxt *tx = &sdev->tx;
struct sdio_tx *t;
u8 *pkt = data;
int no_spc = 0;
u16 cmd_evt;
unsigned long flags;
if (len > TX_BUF_SIZE - TYPE_A_HEADER_SIZE)
return -EINVAL;
spin_lock_irqsave(&tx->lock, flags);
cmd_evt = (pkt[0] << 8) | pkt[1];
if (cmd_evt == WIMAX_TX_SDU) {
t = get_tx_struct(tx, &no_spc);
if (t == NULL) {
/* This case must not happen. */
spin_unlock_irqrestore(&tx->lock, flags);
return -ENOSPC;
}
list_add_tail(&t->list, &tx->sdu_list);
memcpy(t->buf, data, len);
t->len = len;
t->callback = cb;
t->cb_data = cb_data;
} else {
t = alloc_tx_struct(tx);
if (t == NULL) {
spin_unlock_irqrestore(&tx->lock, flags);
return -ENOMEM;
}
list_add_tail(&t->list, &tx->hci_list);
t->buf[0] = len & 0xff;
t->buf[1] = (len >> 8) & 0xff;
t->buf[2] = (len >> 16) & 0xff;
t->buf[3] = 2;
memcpy(t->buf + TYPE_A_HEADER_SIZE, data, len);
t->len = len + TYPE_A_HEADER_SIZE;
t->callback = cb;
t->cb_data = cb_data;
}
if (tx->can_send)
schedule_work(&sdev->ws);
spin_unlock_irqrestore(&tx->lock, flags);
if (no_spc)
return -ENOSPC;
return 0;
}
/* Handle the HCI, WIMAX_SDU_TX_FLOW. */
static int control_sdu_tx_flow(struct sdiowm_dev *sdev, u8 *hci_data, int len)
{
struct tx_cxt *tx = &sdev->tx;
u16 cmd_evt;
unsigned long flags;
spin_lock_irqsave(&tx->lock, flags);
cmd_evt = (hci_data[0] << 8) | (hci_data[1]);
if (cmd_evt != WIMAX_SDU_TX_FLOW)
goto out;
if (hci_data[4] == 0) {
dev_dbg(&sdev->func->dev, "WIMAX ==> STOP SDU TX\n");
tx->stop_sdu_tx = 1;
} else if (hci_data[4] == 1) {
dev_dbg(&sdev->func->dev, "WIMAX ==> START SDU TX\n");
tx->stop_sdu_tx = 0;
if (tx->can_send)
schedule_work(&sdev->ws);
/* If free buffer for sdu tx doesn't exist, then tx queue
* should not be woken. For this reason, don't pass the command,
* START_SDU_TX.
*/
if (list_empty(&tx->free_list))
len = 0;
}
out:
spin_unlock_irqrestore(&tx->lock, flags);
return len;
}
static void gdm_sdio_irq(struct sdio_func *func)
{
struct phy_dev *phy_dev = sdio_get_drvdata(func);
struct sdiowm_dev *sdev = phy_dev->priv_dev;
struct tx_cxt *tx = &sdev->tx;
struct rx_cxt *rx = &sdev->rx;
struct sdio_rx *r;
unsigned long flags;
u8 val, hdr[TYPE_A_LOOKAHEAD_SIZE], *buf;
u32 len, blocks, n;
int ret, remain;
/* Check interrupt */
val = sdio_readb(func, 0x13, &ret);
if (val & 0x01)
sdio_writeb(func, 0x01, 0x13, &ret); /* clear interrupt */
else
return;
ret = sdio_memcpy_fromio(func, hdr, 0x0, TYPE_A_LOOKAHEAD_SIZE);
if (ret) {
dev_err(&func->dev,
"Cannot read from function %d\n", func->num);
goto done;
}
len = (hdr[2] << 16) | (hdr[1] << 8) | hdr[0];
if (len > (RX_BUF_SIZE - TYPE_A_HEADER_SIZE)) {
dev_err(&func->dev, "Too big Type-A size: %d\n", len);
goto done;
}
if (hdr[3] == 1) { /* Ack */
u32 *ack_seq = (u32 *)&hdr[4];
spin_lock_irqsave(&tx->lock, flags);
tx->can_send = 1;
if (!list_empty(&tx->sdu_list) || !list_empty(&tx->hci_list))
schedule_work(&sdev->ws);
spin_unlock_irqrestore(&tx->lock, flags);
dev_dbg(&func->dev, "Ack... %0x\n", ntohl(*ack_seq));
goto done;
}
memcpy(rx->rx_buf, hdr + TYPE_A_HEADER_SIZE,
TYPE_A_LOOKAHEAD_SIZE - TYPE_A_HEADER_SIZE);
buf = rx->rx_buf + TYPE_A_LOOKAHEAD_SIZE - TYPE_A_HEADER_SIZE;
remain = len - TYPE_A_LOOKAHEAD_SIZE + TYPE_A_HEADER_SIZE;
if (remain <= 0)
goto end_io;
blocks = remain / func->cur_blksize;
if (blocks) {
n = blocks * func->cur_blksize;
ret = sdio_memcpy_fromio(func, buf, 0x0, n);
if (ret) {
dev_err(&func->dev,
"Cannot read from function %d\n", func->num);
goto done;
}
buf += n;
remain -= n;
}
if (remain) {
ret = sdio_memcpy_fromio(func, buf, 0x0, remain);
if (ret) {
dev_err(&func->dev,
"Cannot read from function %d\n", func->num);
goto done;
}
}
end_io:
dev_dbg(&func->dev, "sdio_receive: %*ph\n", len, rx->rx_buf);
len = control_sdu_tx_flow(sdev, rx->rx_buf, len);
spin_lock_irqsave(&rx->lock, flags);
if (!list_empty(&rx->req_list)) {
r = list_entry(rx->req_list.next, struct sdio_rx, list);
spin_unlock_irqrestore(&rx->lock, flags);
if (r->callback)
r->callback(r->cb_data, rx->rx_buf, len);
spin_lock_irqsave(&rx->lock, flags);
list_del(&r->list);
put_rx_struct(rx, r);
}
spin_unlock_irqrestore(&rx->lock, flags);
done:
sdio_writeb(func, 0x00, 0x10, &ret); /* PCRRT */
if (!phy_dev->netdev)
register_wimax_device(phy_dev, &func->dev);
}
static int gdm_sdio_receive(void *priv_dev,
void (*cb)(void *cb_data, void *data, int len),
void *cb_data)
{
struct sdiowm_dev *sdev = priv_dev;
struct rx_cxt *rx = &sdev->rx;
struct sdio_rx *r;
unsigned long flags;
spin_lock_irqsave(&rx->lock, flags);
r = get_rx_struct(rx);
if (r == NULL) {
spin_unlock_irqrestore(&rx->lock, flags);
return -ENOMEM;
}
r->callback = cb;
r->cb_data = cb_data;
list_add_tail(&r->list, &rx->req_list);
spin_unlock_irqrestore(&rx->lock, flags);
return 0;
}
static int sdio_wimax_probe(struct sdio_func *func,
const struct sdio_device_id *id)
{
int ret;
struct phy_dev *phy_dev = NULL;
struct sdiowm_dev *sdev = NULL;
dev_info(&func->dev, "Found GDM SDIO VID = 0x%04x PID = 0x%04x...\n",
func->vendor, func->device);
dev_info(&func->dev, "GCT WiMax driver version %s\n", DRIVER_VERSION);
sdio_claim_host(func);
sdio_enable_func(func);
sdio_claim_irq(func, gdm_sdio_irq);
ret = sdio_boot(func);
if (ret)
return ret;
phy_dev = kzalloc(sizeof(*phy_dev), GFP_KERNEL);
if (phy_dev == NULL) {
ret = -ENOMEM;
goto out;
}
sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
if (sdev == NULL) {
ret = -ENOMEM;
goto out;
}
phy_dev->priv_dev = (void *)sdev;
phy_dev->send_func = gdm_sdio_send;
phy_dev->rcv_func = gdm_sdio_receive;
ret = init_sdio(sdev);
if (ret < 0)
goto out;
sdev->func = func;
sdio_writeb(func, 1, 0x14, &ret); /* Enable interrupt */
sdio_release_host(func);
INIT_WORK(&sdev->ws, do_tx);
sdio_set_drvdata(func, phy_dev);
out:
if (ret) {
kfree(phy_dev);
kfree(sdev);
}
return ret;
}
static void sdio_wimax_remove(struct sdio_func *func)
{
struct phy_dev *phy_dev = sdio_get_drvdata(func);
struct sdiowm_dev *sdev = phy_dev->priv_dev;
cancel_work_sync(&sdev->ws);
if (phy_dev->netdev)
unregister_wimax_device(phy_dev);
sdio_claim_host(func);
sdio_release_irq(func);
sdio_disable_func(func);
sdio_release_host(func);
release_sdio(sdev);
kfree(sdev);
kfree(phy_dev);
}
static const struct sdio_device_id sdio_wimax_ids[] = {
{ SDIO_DEVICE(0x0296, 0x5347) },
{0}
};
MODULE_DEVICE_TABLE(sdio, sdio_wimax_ids);
static struct sdio_driver sdio_wimax_driver = {
.probe = sdio_wimax_probe,
.remove = sdio_wimax_remove,
.name = "sdio_wimax",
.id_table = sdio_wimax_ids,
};
static int __init sdio_gdm_wimax_init(void)
{
return sdio_register_driver(&sdio_wimax_driver);
}
static void __exit sdio_gdm_wimax_exit(void)
{
sdio_unregister_driver(&sdio_wimax_driver);
}
module_init(sdio_gdm_wimax_init);
module_exit(sdio_gdm_wimax_exit);
MODULE_VERSION(DRIVER_VERSION);
MODULE_DESCRIPTION("GCT WiMax SDIO Device Driver");
MODULE_AUTHOR("Ethan Park");
MODULE_LICENSE("GPL");