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/init.h>
  17 #include <linux/mm.h>
  18 #include <linux/uaccess.h>
  19 #include <linux/fs.h>
  20 #include <linux/sched.h>
  21 #include <linux/slab.h>
  22
  23 #include <linux/mmc/core.h>
  24 #include <linux/mmc/card.h>
  25 #include <linux/mmc/sdio_func.h>
  26
  27 #include "gdm_sdio.h"
  28
  29 #define TYPE_A_HEADER_SIZE      4
  30 #define TYPE_A_LOOKAHEAD_SIZE   16
  31 #define YMEM0_SIZE                      0x8000  /* 32kbytes */
  32 #define DOWNLOAD_SIZE           (YMEM0_SIZE - TYPE_A_HEADER_SIZE)
  33
  34 #define KRN_PATH        "/lib/firmware/gdm72xx/gdmskrn.bin"
  35 #define RFS_PATH        "/lib/firmware/gdm72xx/gdmsrfs.bin"
  36
  37 static u8 *tx_buf;
  38
  39 static int ack_ready(struct sdio_func *func)
  40 {
  41         unsigned long start = jiffies;
  42         u8 val;
  43         int ret;
  44
  45         while ((jiffies - start) < HZ) {
  46                 val = sdio_readb(func, 0x13, &ret);
  47                 if (val & 0x01)
  48                         return 1;
  49                 schedule();
  50         }
  51
  52         return 0;
  53 }
  54
  55 static int download_image(struct sdio_func *func, char *img_name)
  56 {
  57         int ret = 0, len, size, pno;
  58         struct file *filp = NULL;
  59         struct inode *inode = NULL;
  60         u8 *buf = tx_buf;
  61         loff_t pos = 0;
  62
  63         filp = filp_open(img_name, O_RDONLY | O_LARGEFILE, 0);
  64         if (IS_ERR(filp)) {
  65                 printk(KERN_ERR "Can't find %s.\n", img_name);
  66                 return -ENOENT;
  67         }
  68
  69         inode = filp->f_dentry->d_inode;
  70         if (!S_ISREG(inode->i_mode)) {
  71                 printk(KERN_ERR "Invalid file type: %s\n", img_name);
  72                 ret = -EINVAL;
  73                 goto out;
  74         }
  75
  76         size = i_size_read(inode->i_mapping->host);
  77         if (size <= 0) {
  78                 printk(KERN_ERR "Unable to find file size: %s\n", img_name);
  79                 ret = size;
  80                 goto out;
  81         }
  82
  83         pno = 0;
  84         while ((len = filp->f_op->read(filp, buf + TYPE_A_HEADER_SIZE,
  85                                         DOWNLOAD_SIZE, &pos))) {
  86                 if (len < 0) {
  87                         ret = -1;
  88                         goto out;
  89                 }
  90
  91                 buf[0] = len & 0xff;
  92                 buf[1] = (len >> 8) & 0xff;
  93                 buf[2] = (len >> 16) & 0xff;
  94
  95                 if (pos >= size)        /* The last packet */
  96                         buf[3] = 2;
  97                 else
  98                         buf[3] = 0;
  99
 100                 ret = sdio_memcpy_toio(func, 0, buf, len + TYPE_A_HEADER_SIZE);
 101                 if (ret < 0) {
 102                         printk(KERN_ERR "gdmwm: send image error: "
 103                                 "packet number = %d ret = %d\n", pno, ret);
 104                         goto out;
 105                 }
 106                 if (buf[3] == 2)        /* The last packet */
 107                         break;
 108                 if (!ack_ready(func)) {
 109                         ret = -EIO;
 110                         printk(KERN_ERR "gdmwm: Ack is not ready.\n");
 111                         goto out;
 112                 }
 113                 ret = sdio_memcpy_fromio(func, buf, 0, TYPE_A_LOOKAHEAD_SIZE);
 114                 if (ret < 0) {
 115                         printk(KERN_ERR "gdmwm: receive ack error: "
 116                                 "packet number = %d ret = %d\n", pno, ret);
 117                         goto out;
 118                 }
 119                 sdio_writeb(func, 0x01, 0x13, &ret);
 120                 sdio_writeb(func, 0x00, 0x10, &ret);    /* PCRRT */
 121
 122                 pno++;
 123         }
 124 out:
 125         filp_close(filp, NULL);
 126         return ret;
 127 }
 128
 129 int sdio_boot(struct sdio_func *func)
 130 {
 131         static mm_segment_t fs;
 132         int ret;
 133
 134         tx_buf = kmalloc(YMEM0_SIZE, GFP_KERNEL);
 135         if (tx_buf == NULL) {
 136                 printk(KERN_ERR "Error: kmalloc: %s %d\n", __func__, __LINE__);
 137                 return -ENOMEM;
 138         }
 139
 140         fs = get_fs();
 141         set_fs(get_ds());
 142
 143         ret = download_image(func, KRN_PATH);
 144         if (ret)
 145                 goto restore_fs;
 146         printk(KERN_INFO "GCT: Kernel download success.\n");
 147
 148         ret = download_image(func, RFS_PATH);
 149         if (ret)
 150                 goto restore_fs;
 151         printk(KERN_INFO "GCT: Filesystem download success.\n");
 152
 153 restore_fs:
 154         set_fs(fs);
 155         kfree(tx_buf);
 156         return ret;
 157 }