kernel/drivers/staging/gdm72xx/usb_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/uaccess.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/usb.h>
  19 #include <linux/unistd.h>
  20 #include <linux/slab.h>
  21 #include <linux/firmware.h>
  22
  23 #include <asm/byteorder.h>
  24 #include "gdm_usb.h"
  25 #include "usb_boot.h"
  26
  27 #define DN_KERNEL_MAGIC_NUMBER  0x10760001
  28 #define DN_ROOTFS_MAGIC_NUMBER  0x10760002
  29
  30 #define DOWNLOAD_SIZE           1024
  31
  32 #define MAX_IMG_CNT             16
  33 #define FW_DIR                  "gdm72xx/"
  34 #define FW_UIMG                 "gdmuimg.bin"
  35 #define FW_KERN                 "zImage"
  36 #define FW_FS                   "ramdisk.jffs2"
  37
  38 struct dn_header {
  39         __be32  magic_num;
  40         __be32  file_size;
  41 };
  42
  43 struct img_header {
  44         u32     magic_code;
  45         u32     count;
  46         u32     len;
  47         u32     offset[MAX_IMG_CNT];
  48         char    hostname[32];
  49         char    date[32];
  50 };
  51
  52 struct fw_info {
  53         u32     id;
  54         u32     len;
  55         u32     kernel_len;
  56         u32     rootfs_len;
  57         u32     kernel_offset;
  58         u32     rootfs_offset;
  59         u32     fw_ver;
  60         u32     mac_ver;
  61         char    hostname[32];
  62         char    userid[16];
  63         char    date[32];
  64         char    user_desc[128];
  65 };
  66
  67 static void array_le32_to_cpu(u32 *arr, int num)
  68 {
  69         int i;
  70
  71         for (i = 0; i < num; i++, arr++)
  72                 le32_to_cpus(arr);
  73 }
  74
  75 static u8 *tx_buf;
  76
  77 static int gdm_wibro_send(struct usb_device *usbdev, void *data, int len)
  78 {
  79         int ret;
  80         int actual;
  81
  82         ret = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), data, len,
  83                            &actual, 1000);
  84
  85         if (ret < 0) {
  86                 dev_err(&usbdev->dev, "Error : usb_bulk_msg ( result = %d )\n",
  87                         ret);
  88                 return ret;
  89         }
  90         return 0;
  91 }
  92
  93 static int gdm_wibro_recv(struct usb_device *usbdev, void *data, int len)
  94 {
  95         int ret;
  96         int actual;
  97
  98         ret = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), data, len,
  99                            &actual, 5000);
 100
 101         if (ret < 0) {
 102                 dev_err(&usbdev->dev,
 103                         "Error : usb_bulk_msg(recv) ( result = %d )\n", ret);
 104                 return ret;
 105         }
 106         return 0;
 107 }
 108
 109 static int download_image(struct usb_device *usbdev,
 110                           const struct firmware *firm,
 111                           loff_t pos, u32 img_len, u32 magic_num)
 112 {
 113         struct dn_header h;
 114         int ret = 0;
 115         u32 size;
 116
 117         size = ALIGN(img_len, DOWNLOAD_SIZE);
 118         h.magic_num = cpu_to_be32(magic_num);
 119         h.file_size = cpu_to_be32(size);
 120
 121         ret = gdm_wibro_send(usbdev, &h, sizeof(h));
 122         if (ret < 0)
 123                 return ret;
 124
 125         while (img_len > 0) {
 126                 if (img_len > DOWNLOAD_SIZE)
 127                         size = DOWNLOAD_SIZE;
 128                 else
 129                         size = img_len; /* the last chunk of data */
 130
 131                 memcpy(tx_buf, firm->data + pos, size);
 132                 ret = gdm_wibro_send(usbdev, tx_buf, size);
 133
 134                 if (ret < 0)
 135                         return ret;
 136
 137                 img_len -= size;
 138                 pos += size;
 139         }
 140
 141         return ret;
 142 }
 143
 144 int usb_boot(struct usb_device *usbdev, u16 pid)
 145 {
 146         int i, ret = 0;
 147         struct img_header hdr;
 148         struct fw_info fw_info;
 149         loff_t pos = 0;
 150         char *img_name = FW_DIR FW_UIMG;
 151         const struct firmware *firm;
 152
 153         ret = request_firmware(&firm, img_name, &usbdev->dev);
 154         if (ret < 0) {
 155                 dev_err(&usbdev->dev,
 156                         "requesting firmware %s failed with error %d\n",
 157                         img_name, ret);
 158                 return ret;
 159         }
 160
 161         tx_buf = kmalloc(DOWNLOAD_SIZE, GFP_KERNEL);
 162         if (tx_buf == NULL)
 163                 return -ENOMEM;
 164
 165         if (firm->size < sizeof(hdr)) {
 166                 dev_err(&usbdev->dev, "Cannot read the image info.\n");
 167                 ret = -EIO;
 168                 goto out;
 169         }
 170         memcpy(&hdr, firm->data, sizeof(hdr));
 171
 172         array_le32_to_cpu((u32 *)&hdr, 19);
 173
 174         if (hdr.count > MAX_IMG_CNT) {
 175                 dev_err(&usbdev->dev, "Too many images. %d\n", hdr.count);
 176                 ret = -EINVAL;
 177                 goto out;
 178         }
 179
 180         for (i = 0; i < hdr.count; i++) {
 181                 if (hdr.offset[i] > hdr.len) {
 182                         dev_err(&usbdev->dev,
 183                                 "Invalid offset. Entry = %d Offset = 0x%08x Image length = 0x%08x\n",
 184                                 i, hdr.offset[i], hdr.len);
 185                         ret = -EINVAL;
 186                         goto out;
 187                 }
 188
 189                 pos = hdr.offset[i];
 190                 if (firm->size < sizeof(fw_info) + pos) {
 191                         dev_err(&usbdev->dev, "Cannot read the FW info.\n");
 192                         ret = -EIO;
 193                         goto out;
 194                 }
 195                 memcpy(&fw_info, firm->data + pos, sizeof(fw_info));
 196
 197                 array_le32_to_cpu((u32 *)&fw_info, 8);
 198
 199                 if ((fw_info.id & 0xffff) != pid)
 200                         continue;
 201
 202                 pos = hdr.offset[i] + fw_info.kernel_offset;
 203                 if (firm->size < fw_info.kernel_len + pos) {
 204                         dev_err(&usbdev->dev, "Kernel FW is too small.\n");
 205                         goto out;
 206                 }
 207
 208                 ret = download_image(usbdev, firm, pos, fw_info.kernel_len,
 209                                      DN_KERNEL_MAGIC_NUMBER);
 210                 if (ret < 0)
 211                         goto out;
 212                 dev_info(&usbdev->dev, "GCT: Kernel download success.\n");
 213
 214                 pos = hdr.offset[i] + fw_info.rootfs_offset;
 215                 if (firm->size < fw_info.rootfs_len + pos) {
 216                         dev_err(&usbdev->dev, "Filesystem FW is too small.\n");
 217                         goto out;
 218                 }
 219                 ret = download_image(usbdev, firm, pos, fw_info.rootfs_len,
 220                                      DN_ROOTFS_MAGIC_NUMBER);
 221                 if (ret < 0)
 222                         goto out;
 223                 dev_info(&usbdev->dev, "GCT: Filesystem download success.\n");
 224
 225                 break;
 226         }
 227
 228         if (i == hdr.count) {
 229                 dev_err(&usbdev->dev, "Firmware for gsk%x is not installed.\n",
 230                         pid);
 231                 ret = -EINVAL;
 232         }
 233 out:
 234         release_firmware(firm);
 235         kfree(tx_buf);
 236         return ret;
 237 }
 238
 239 /*#define GDM7205_PADDING               256 */
 240 #define DOWNLOAD_CHUCK                  2048
 241 #define KERNEL_TYPE_STRING              "linux"
 242 #define FS_TYPE_STRING                  "rootfs"
 243
 244 static int em_wait_ack(struct usb_device *usbdev, int send_zlp)
 245 {
 246         int ack;
 247         int ret = -1;
 248
 249         if (send_zlp) {
 250                 /*Send ZLP*/
 251                 ret = gdm_wibro_send(usbdev, NULL, 0);
 252                 if (ret < 0)
 253                         goto out;
 254         }
 255
 256         /*Wait for ACK*/
 257         ret = gdm_wibro_recv(usbdev, &ack, sizeof(ack));
 258         if (ret < 0)
 259                 goto out;
 260 out:
 261         return ret;
 262 }
 263
 264 static int em_download_image(struct usb_device *usbdev, const char *img_name,
 265                              char *type_string)
 266 {
 267         char *buf = NULL;
 268         loff_t pos = 0;
 269         int ret = 0;
 270         int len;
 271         int img_len;
 272         const struct firmware *firm;
 273         #if defined(GDM7205_PADDING)
 274         const int pad_size = GDM7205_PADDING;
 275         #else
 276         const int pad_size = 0;
 277         #endif
 278
 279         ret = request_firmware(&firm, img_name, &usbdev->dev);
 280         if (ret < 0) {
 281                 dev_err(&usbdev->dev,
 282                         "requesting firmware %s failed with error %d\n",
 283                         img_name, ret);
 284                 return ret;
 285         }
 286
 287         buf = kmalloc(DOWNLOAD_CHUCK + pad_size, GFP_KERNEL);
 288         if (buf == NULL)
 289                 return -ENOMEM;
 290
 291         strcpy(buf+pad_size, type_string);
 292         ret = gdm_wibro_send(usbdev, buf, strlen(type_string)+pad_size);
 293         if (ret < 0)
 294                 goto out;
 295
 296         img_len = firm->size;
 297
 298         if (img_len <= 0) {
 299                 ret = -1;
 300                 goto out;
 301         }
 302
 303         while (img_len > 0) {
 304                 if (img_len > DOWNLOAD_CHUCK)
 305                         len = DOWNLOAD_CHUCK;
 306                 else
 307                         len = img_len; /* the last chunk of data */
 308
 309                 memcpy(buf+pad_size, firm->data + pos, len);
 310                 ret = gdm_wibro_send(usbdev, buf, len+pad_size);
 311
 312                 if (ret < 0)
 313                         goto out;
 314
 315                 img_len -= DOWNLOAD_CHUCK;
 316                 pos += DOWNLOAD_CHUCK;
 317
 318                 ret = em_wait_ack(usbdev, ((len+pad_size) % 512 == 0));
 319                 if (ret < 0)
 320                         goto out;
 321         }
 322
 323         ret = em_wait_ack(usbdev, 1);
 324         if (ret < 0)
 325                 goto out;
 326
 327 out:
 328         release_firmware(firm);
 329         kfree(buf);
 330
 331         return ret;
 332 }
 333
 334 static int em_fw_reset(struct usb_device *usbdev)
 335 {
 336         /*Send ZLP*/
 337         return gdm_wibro_send(usbdev, NULL, 0);
 338 }
 339
 340 int usb_emergency(struct usb_device *usbdev)
 341 {
 342         int ret;
 343         const char *kern_name = FW_DIR FW_KERN;
 344         const char *fs_name = FW_DIR FW_FS;
 345
 346         ret = em_download_image(usbdev, kern_name, KERNEL_TYPE_STRING);
 347         if (ret < 0)
 348                 return ret;
 349         dev_err(&usbdev->dev, "GCT Emergency: Kernel download success.\n");
 350
 351         ret = em_download_image(usbdev, fs_name, FS_TYPE_STRING);
 352         if (ret < 0)
 353                 return ret;
 354         dev_info(&usbdev->dev, "GCT Emergency: Filesystem download success.\n");
 355
 356         ret = em_fw_reset(usbdev);
 357
 358         return ret;
 359 }