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/*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mmc/core.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/firmware.h>
#include "gdm_sdio.h"
#define TYPE_A_HEADER_SIZE 4
#define TYPE_A_LOOKAHEAD_SIZE 16
#define YMEM0_SIZE 0x8000 /* 32kbytes */
#define DOWNLOAD_SIZE (YMEM0_SIZE - TYPE_A_HEADER_SIZE)
#define FW_DIR "gdm72xx/"
#define FW_KRN "gdmskrn.bin"
#define FW_RFS "gdmsrfs.bin"
static u8 *tx_buf;
static int ack_ready(struct sdio_func *func)
{
unsigned long start = jiffies;
u8 val;
int ret;
while ((jiffies - start) < HZ) {
val = sdio_readb(func, 0x13, &ret);
if (val & 0x01)
return 1;
schedule();
}
return 0;
}
static int download_image(struct sdio_func *func, const char *img_name)
{
int ret = 0, len, pno;
u8 *buf = tx_buf;
loff_t pos = 0;
int img_len;
const struct firmware *firm;
ret = request_firmware(&firm, img_name, &func->dev);
if (ret < 0) {
dev_err(&func->dev,
"requesting firmware %s failed with error %d\n",
img_name, ret);
return ret;
}
buf = kmalloc(DOWNLOAD_SIZE + TYPE_A_HEADER_SIZE, GFP_KERNEL);
if (buf == NULL) {
dev_err(&func->dev, "Error: kmalloc\n");
return -ENOMEM;
}
img_len = firm->size;
if (img_len <= 0) {
ret = -1;
goto out;
}
pno = 0;
while (img_len > 0) {
if (img_len > DOWNLOAD_SIZE) {
len = DOWNLOAD_SIZE;
buf[3] = 0;
} else {
len = img_len; /* the last packet */
buf[3] = 2;
}
buf[0] = len & 0xff;
buf[1] = (len >> 8) & 0xff;
buf[2] = (len >> 16) & 0xff;
memcpy(buf+TYPE_A_HEADER_SIZE, firm->data + pos, len);
ret = sdio_memcpy_toio(func, 0, buf, len + TYPE_A_HEADER_SIZE);
if (ret < 0) {
dev_err(&func->dev,
"send image error: packet number = %d ret = %d\n",
pno, ret);
goto out;
}
if (buf[3] == 2) /* The last packet */
break;
if (!ack_ready(func)) {
ret = -EIO;
dev_err(&func->dev, "Ack is not ready.\n");
goto out;
}
ret = sdio_memcpy_fromio(func, buf, 0, TYPE_A_LOOKAHEAD_SIZE);
if (ret < 0) {
dev_err(&func->dev,
"receive ack error: packet number = %d ret = %d\n",
pno, ret);
goto out;
}
sdio_writeb(func, 0x01, 0x13, &ret);
sdio_writeb(func, 0x00, 0x10, &ret); /* PCRRT */
img_len -= DOWNLOAD_SIZE;
pos += DOWNLOAD_SIZE;
pno++;
}
out:
kfree(buf);
return ret;
}
int sdio_boot(struct sdio_func *func)
{
int ret;
const char *krn_name = FW_DIR FW_KRN;
const char *rfs_name = FW_DIR FW_RFS;
tx_buf = kmalloc(YMEM0_SIZE, GFP_KERNEL);
if (tx_buf == NULL) {
dev_err(&func->dev, "Error: kmalloc: %s %d\n",
__func__, __LINE__);
return -ENOMEM;
}
ret = download_image(func, krn_name);
if (ret)
goto restore_fs;
dev_info(&func->dev, "GCT: Kernel download success.\n");
ret = download_image(func, rfs_name);
if (ret)
goto restore_fs;
dev_info(&func->dev, "GCT: Filesystem download success.\n");
restore_fs:
kfree(tx_buf);
return ret;
}
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