kernel/drivers/staging/gdm72xx/sdio_boot.c

   1 /*
   2  * Copyright (c) 2012 GCT Semiconductor, Inc. All rights reserved.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/uaccess.h>
  18 #include <linux/fs.h>
  19 #include <linux/sched.h>
  20 #include <linux/slab.h>
  21
  22 #include <linux/mmc/core.h>
  23 #include <linux/mmc/card.h>
  24 #include <linux/mmc/sdio_func.h>
  25
  26 #include <linux/firmware.h>
  27
  28 #include "gdm_sdio.h"
  29 #include "sdio_boot.h"
  30
  31 #define TYPE_A_HEADER_SIZE      4
  32 #define TYPE_A_LOOKAHEAD_SIZE   16
  33 #define YMEM0_SIZE              0x8000  /* 32kbytes */
  34 #define DOWNLOAD_SIZE           (YMEM0_SIZE - TYPE_A_HEADER_SIZE)
  35
  36 #define FW_DIR                  "gdm72xx/"
  37 #define FW_KRN                  "gdmskrn.bin"
  38 #define FW_RFS                  "gdmsrfs.bin"
  39
  40 static u8 *tx_buf;
  41
  42 static int ack_ready(struct sdio_func *func)
  43 {
  44         unsigned long wait = jiffies + HZ;
  45         u8 val;
  46         int ret;
  47
  48         while (time_before(jiffies, wait)) {
  49                 val = sdio_readb(func, 0x13, &ret);
  50                 if (val & 0x01)
  51                         return 1;
  52                 schedule();
  53         }
  54
  55         return 0;
  56 }
  57
  58 static int download_image(struct sdio_func *func, const char *img_name)
  59 {
  60         int ret = 0, len, pno;
  61         u8 *buf = tx_buf;
  62         loff_t pos = 0;
  63         int img_len;
  64         const struct firmware *firm;
  65
  66         ret = request_firmware(&firm, img_name, &func->dev);
  67         if (ret < 0) {
  68                 dev_err(&func->dev,
  69                         "requesting firmware %s failed with error %d\n",
  70                         img_name, ret);
  71                 return ret;
  72         }
  73
  74         buf = kmalloc(DOWNLOAD_SIZE + TYPE_A_HEADER_SIZE, GFP_KERNEL);
  75         if (buf == NULL)
  76                 return -ENOMEM;
  77
  78         img_len = firm->size;
  79
  80         if (img_len <= 0) {
  81                 ret = -1;
  82                 goto out;
  83         }
  84
  85         pno = 0;
  86         while (img_len > 0) {
  87                 if (img_len > DOWNLOAD_SIZE) {
  88                         len = DOWNLOAD_SIZE;
  89                         buf[3] = 0;
  90                 } else {
  91                         len = img_len; /* the last packet */
  92                         buf[3] = 2;
  93                 }
  94
  95                 buf[0] = len & 0xff;
  96                 buf[1] = (len >> 8) & 0xff;
  97                 buf[2] = (len >> 16) & 0xff;
  98
  99                 memcpy(buf+TYPE_A_HEADER_SIZE, firm->data + pos, len);
 100                 ret = sdio_memcpy_toio(func, 0, buf, len + TYPE_A_HEADER_SIZE);
 101                 if (ret < 0) {
 102                         dev_err(&func->dev,
 103                                 "send image error: packet number = %d ret = %d\n",
 104                                 pno, ret);
 105                         goto out;
 106                 }
 107
 108                 if (buf[3] == 2)        /* The last packet */
 109                         break;
 110                 if (!ack_ready(func)) {
 111                         ret = -EIO;
 112                         dev_err(&func->dev, "Ack is not ready.\n");
 113                         goto out;
 114                 }
 115                 ret = sdio_memcpy_fromio(func, buf, 0, TYPE_A_LOOKAHEAD_SIZE);
 116                 if (ret < 0) {
 117                         dev_err(&func->dev,
 118                                 "receive ack error: packet number = %d ret = %d\n",
 119                                 pno, ret);
 120                         goto out;
 121                 }
 122                 sdio_writeb(func, 0x01, 0x13, &ret);
 123                 sdio_writeb(func, 0x00, 0x10, &ret);    /* PCRRT */
 124
 125                 img_len -= DOWNLOAD_SIZE;
 126                 pos += DOWNLOAD_SIZE;
 127                 pno++;
 128         }
 129
 130 out:
 131         kfree(buf);
 132         return ret;
 133 }
 134
 135 int sdio_boot(struct sdio_func *func)
 136 {
 137         int ret;
 138         const char *krn_name = FW_DIR FW_KRN;
 139         const char *rfs_name = FW_DIR FW_RFS;
 140
 141         tx_buf = kmalloc(YMEM0_SIZE, GFP_KERNEL);
 142         if (tx_buf == NULL)
 143                 return -ENOMEM;
 144
 145         ret = download_image(func, krn_name);
 146         if (ret)
 147                 goto restore_fs;
 148         dev_info(&func->dev, "GCT: Kernel download success.\n");
 149
 150         ret = download_image(func, rfs_name);
 151         if (ret)
 152                 goto restore_fs;
 153         dev_info(&func->dev, "GCT: Filesystem download success.\n");
 154
 155 restore_fs:
 156         kfree(tx_buf);
 157         return ret;
 158 }