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/*
* Copyright (C) 2012 Spreadtrum Communications Inc.
*
* 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/mmc/sdio_channel.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sd.h>
#include <linux/mmc/mmc.h>
#include "../core/sdio_ops.h"
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/slab.h>
#include <linux/delay.h>
#define SDIO_VENDOR_ID_SPRD 0
#define SDIO_DEVICE_ID_SPRD_SLAVE 0x2260
#define SDIO_DEVICE_ID_SPRD_SLAVE_9620 0x9620
#define DRV_NAME "sprd-sdio-channel"
#define SPRD_SDIO_SLAVE_BLOCK_SIZE 512
struct sdio_channel {
unsigned int open_count;
struct sdio_func *func;
struct mutex func_lock;
};
static struct sdio_channel sprd_sdio_channel_body;
static struct sdio_channel *sprd_sdio_channel = &sprd_sdio_channel_body;
static const struct sdio_device_id sprd_sdio_channel_ids[] = {
{ SDIO_DEVICE(SDIO_VENDOR_ID_SPRD, SDIO_DEVICE_ID_SPRD_SLAVE) },
{ SDIO_DEVICE(SDIO_VENDOR_ID_SPRD, SDIO_DEVICE_ID_SPRD_SLAVE_9620) },
{ 0 },
};
MODULE_DEVICE_TABLE(sdio, sprd_sdio_channel_ids);
int sdio_abort(struct mmc_host *host)
{
int ret;
u8 abort;
u8 buffer[10];
/* SDIO Simplified Specification V2.0, 4.4 Abort for SDIO */
//ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
//if (ret)
abort = 0x01;
//else
// abort |= 0x01;
ret = mmc_io_rw_direct(host->card, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
if (ret)
printk("SDIO: sdio_abort mmc_io_rw_direct_host WRITE FAIL\n");
//abort = 0;
//ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, NULL, &abort);
//if (ret)
// printk("SDIO: sdio_abort mmc_io_rw_direct_host READ FAIL\n");
//printk("SDIO: sdio_abort READ abort = %d\n", abort);
//ret = mmc_io_rw_extended(host->card, 1, 1, 0, 1, buffer, 0, 1);
//if (ret)
//printk("SDIO: sdio_abort EXTENDED_READ FAIL\n");
return ret;
}
unsigned char s_dbg_addr = 0;
unsigned int s_dbg_tx_sdio_abort_sent_cnt = 0;
unsigned int s_dbg_rx_sdio_abort_sent_cnt = 0;
static int sprd_sdio_channel_do_tx(const char *buf, unsigned int len, unsigned int addr) {
int retval;
struct sdio_func *func;
if(buf == NULL)
return -EINVAL;
if( len == 0)
return 0;
func = sprd_sdio_channel->func;
sdio_claim_host(func);
retval = sdio_memcpy_toio(func, addr, buf, len);
//retval = sdio_memcpy_toio(func, s_dbg_addr++, buf, len);
if(retval) {
printk("%s retval: %d\n", __func__, retval);
printk("sprd_sdio_channel_do_tx fail, call sdio_abort()\n");
sdio_abort(func->card->host);
s_dbg_tx_sdio_abort_sent_cnt++;
}
sdio_release_host(func);
return retval;
}
static int sprd_sdio_channel_do_rx(char *buf, unsigned int len, unsigned int addr) {
int retval;
struct sdio_func *func;
if(buf == NULL)
return -EINVAL;
if( len == 0)
return 0;
func = sprd_sdio_channel->func;
sdio_claim_host(func);
retval = sdio_memcpy_fromio(func, buf, addr, len);
if(retval) {
printk("%s retval: %d\n", __func__, retval);
printk("sprd_sdio_channel_do_rx fail, call sdio_abort()\n");
sdio_abort(func->card->host);
s_dbg_rx_sdio_abort_sent_cnt++;
}
sdio_release_host(func);
return retval;
}
int sprd_sdio_channel_open(void) {
int retry = 100;
while(!sprd_sdio_channel->func && retry--) {
msleep (100);
}
if (retry <= 0) {
printk(KERN_ERR "failed to %s()\n", __func__);
return -ENODEV;
}
pr_debug("%s done\n", __func__);
return 0;
}
EXPORT_SYMBOL(sprd_sdio_channel_open);
void sprd_sdio_channel_close(void) {
}
EXPORT_SYMBOL(sprd_sdio_channel_close);
int sprd_sdio_channel_tx(const char *buf, unsigned int len, unsigned int addr) {
int retval = -ENODEV;
if(sprd_sdio_channel->func) {
mutex_lock(&sprd_sdio_channel->func_lock);
if(sprd_sdio_channel->func) {
retval = sprd_sdio_channel_do_tx(buf, len, addr);
}
mutex_unlock(&sprd_sdio_channel->func_lock);
}
return retval;
}
EXPORT_SYMBOL(sprd_sdio_channel_tx);
int sprd_sdio_channel_rx(char *buf, unsigned int len, unsigned int addr) {
int retval = -ENODEV;
if(sprd_sdio_channel->func) {
mutex_lock(&sprd_sdio_channel->func_lock);
if(sprd_sdio_channel->func) {
retval = sprd_sdio_channel_do_rx(buf, len, addr);
}
mutex_unlock(&sprd_sdio_channel->func_lock);
}
return retval;
}
EXPORT_SYMBOL(sprd_sdio_channel_rx);
static int sprd_sdio_channel_probe(struct sdio_func *func, const struct sdio_device_id *id) {
int retval;
struct sdio_channel *channel;
printk(KERN_INFO "%s enter\n", __func__);
channel = sprd_sdio_channel;
mutex_init(&channel->func_lock);
sdio_claim_host(func);
if((retval = sdio_set_block_size(func, SPRD_SDIO_SLAVE_BLOCK_SIZE))) {
goto ERR_HOST;
}
if((retval = sdio_enable_func(func))) {
goto ERR_HOST;
}
channel->func = func;
printk(KERN_INFO "%s done\n", __func__);
ERR_HOST:
sdio_release_host(func);
return retval;
}
static void sprd_sdio_channel_remove(struct sdio_func *func) {
printk(KERN_INFO "%s enter\n", __func__);
mutex_lock(&sprd_sdio_channel->func_lock);
sprd_sdio_channel->func = 0;
sdio_claim_host(func);
sdio_disable_func(func);
sdio_release_host(func);
mutex_unlock(&sprd_sdio_channel->func_lock);
printk(KERN_INFO "%s done\n", __func__);
}
static int sprd_sdio_channel_suspend(struct device *dev) {
mutex_lock(&sprd_sdio_channel->func_lock);
return 0;
}
static int sprd_sdio_channel_resume(struct device *dev) {
mutex_unlock(&sprd_sdio_channel->func_lock);
return 0;
}
static const struct dev_pm_ops sprd_sdio_channel_dev_pm_ops = {
.suspend = sprd_sdio_channel_suspend,
.resume = sprd_sdio_channel_resume,
};
static struct sdio_driver sprd_sdio_channel_driver = {
.name = DRV_NAME,
.probe = sprd_sdio_channel_probe,
.remove = sprd_sdio_channel_remove,
.id_table = sprd_sdio_channel_ids,
.drv = {
.pm = &sprd_sdio_channel_dev_pm_ops,
},
};
static int __init sprd_sdio_channel_init(void) {
return sdio_register_driver(&sprd_sdio_channel_driver);
}
static void __exit sprd_sdio_channel_exit(void) {
sdio_unregister_driver(&sprd_sdio_channel_driver);
}
module_init(sprd_sdio_channel_init);
module_exit(sprd_sdio_channel_exit);
MODULE_DESCRIPTION("Spredtrum SDHCI Function Slave");
MODULE_LICENSE("GPL");
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