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
array_le32_to_cpu(u32 * arr,int num)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
gdm_wibro_send(struct usb_device * usbdev,void * data,int len)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
gdm_wibro_recv(struct usb_device * usbdev,void * data,int len)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
download_image(struct usb_device * usbdev,const struct firmware * firm,loff_t pos,u32 img_len,u32 magic_num)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
usb_boot(struct usb_device * usbdev,u16 pid)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) {
163 release_firmware(firm);
164 return -ENOMEM;
165 }
166
167 if (firm->size < sizeof(hdr)) {
168 dev_err(&usbdev->dev, "Cannot read the image info.\n");
169 ret = -EIO;
170 goto out;
171 }
172 memcpy(&hdr, firm->data, sizeof(hdr));
173
174 array_le32_to_cpu((u32 *)&hdr, 19);
175
176 if (hdr.count > MAX_IMG_CNT) {
177 dev_err(&usbdev->dev, "Too many images. %d\n", hdr.count);
178 ret = -EINVAL;
179 goto out;
180 }
181
182 for (i = 0; i < hdr.count; i++) {
183 if (hdr.offset[i] > hdr.len) {
184 dev_err(&usbdev->dev,
185 "Invalid offset. Entry = %d Offset = 0x%08x Image length = 0x%08x\n",
186 i, hdr.offset[i], hdr.len);
187 ret = -EINVAL;
188 goto out;
189 }
190
191 pos = hdr.offset[i];
192 if (firm->size < sizeof(fw_info) + pos) {
193 dev_err(&usbdev->dev, "Cannot read the FW info.\n");
194 ret = -EIO;
195 goto out;
196 }
197 memcpy(&fw_info, firm->data + pos, sizeof(fw_info));
198
199 array_le32_to_cpu((u32 *)&fw_info, 8);
200
201 if ((fw_info.id & 0xffff) != pid)
202 continue;
203
204 pos = hdr.offset[i] + fw_info.kernel_offset;
205 if (firm->size < fw_info.kernel_len + pos) {
206 dev_err(&usbdev->dev, "Kernel FW is too small.\n");
207 goto out;
208 }
209
210 ret = download_image(usbdev, firm, pos, fw_info.kernel_len,
211 DN_KERNEL_MAGIC_NUMBER);
212 if (ret < 0)
213 goto out;
214 dev_info(&usbdev->dev, "GCT: Kernel download success.\n");
215
216 pos = hdr.offset[i] + fw_info.rootfs_offset;
217 if (firm->size < fw_info.rootfs_len + pos) {
218 dev_err(&usbdev->dev, "Filesystem FW is too small.\n");
219 goto out;
220 }
221 ret = download_image(usbdev, firm, pos, fw_info.rootfs_len,
222 DN_ROOTFS_MAGIC_NUMBER);
223 if (ret < 0)
224 goto out;
225 dev_info(&usbdev->dev, "GCT: Filesystem download success.\n");
226
227 break;
228 }
229
230 if (i == hdr.count) {
231 dev_err(&usbdev->dev, "Firmware for gsk%x is not installed.\n",
232 pid);
233 ret = -EINVAL;
234 }
235 out:
236 release_firmware(firm);
237 kfree(tx_buf);
238 return ret;
239 }
240
241 /*#define GDM7205_PADDING 256 */
242 #define DOWNLOAD_CHUCK 2048
243 #define KERNEL_TYPE_STRING "linux"
244 #define FS_TYPE_STRING "rootfs"
245
em_wait_ack(struct usb_device * usbdev,int send_zlp)246 static int em_wait_ack(struct usb_device *usbdev, int send_zlp)
247 {
248 int ack;
249 int ret = -1;
250
251 if (send_zlp) {
252 /*Send ZLP*/
253 ret = gdm_wibro_send(usbdev, NULL, 0);
254 if (ret < 0)
255 goto out;
256 }
257
258 /*Wait for ACK*/
259 ret = gdm_wibro_recv(usbdev, &ack, sizeof(ack));
260 if (ret < 0)
261 goto out;
262 out:
263 return ret;
264 }
265
em_download_image(struct usb_device * usbdev,const char * img_name,char * type_string)266 static int em_download_image(struct usb_device *usbdev, const char *img_name,
267 char *type_string)
268 {
269 char *buf = NULL;
270 loff_t pos = 0;
271 int ret = 0;
272 int len;
273 int img_len;
274 const struct firmware *firm;
275 #if defined(GDM7205_PADDING)
276 const int pad_size = GDM7205_PADDING;
277 #else
278 const int pad_size = 0;
279 #endif
280
281 ret = request_firmware(&firm, img_name, &usbdev->dev);
282 if (ret < 0) {
283 dev_err(&usbdev->dev,
284 "requesting firmware %s failed with error %d\n",
285 img_name, ret);
286 return ret;
287 }
288
289 buf = kmalloc(DOWNLOAD_CHUCK + pad_size, GFP_KERNEL);
290 if (!buf) {
291 release_firmware(firm);
292 return -ENOMEM;
293 }
294
295 strcpy(buf+pad_size, type_string);
296 ret = gdm_wibro_send(usbdev, buf, strlen(type_string)+pad_size);
297 if (ret < 0)
298 goto out;
299
300 img_len = firm->size;
301
302 if (img_len <= 0) {
303 ret = -1;
304 goto out;
305 }
306
307 while (img_len > 0) {
308 if (img_len > DOWNLOAD_CHUCK)
309 len = DOWNLOAD_CHUCK;
310 else
311 len = img_len; /* the last chunk of data */
312
313 memcpy(buf+pad_size, firm->data + pos, len);
314 ret = gdm_wibro_send(usbdev, buf, len+pad_size);
315
316 if (ret < 0)
317 goto out;
318
319 img_len -= DOWNLOAD_CHUCK;
320 pos += DOWNLOAD_CHUCK;
321
322 ret = em_wait_ack(usbdev, ((len+pad_size) % 512 == 0));
323 if (ret < 0)
324 goto out;
325 }
326
327 ret = em_wait_ack(usbdev, 1);
328 if (ret < 0)
329 goto out;
330
331 out:
332 release_firmware(firm);
333 kfree(buf);
334
335 return ret;
336 }
337
em_fw_reset(struct usb_device * usbdev)338 static int em_fw_reset(struct usb_device *usbdev)
339 {
340 /*Send ZLP*/
341 return gdm_wibro_send(usbdev, NULL, 0);
342 }
343
usb_emergency(struct usb_device * usbdev)344 int usb_emergency(struct usb_device *usbdev)
345 {
346 int ret;
347 const char *kern_name = FW_DIR FW_KERN;
348 const char *fs_name = FW_DIR FW_FS;
349
350 ret = em_download_image(usbdev, kern_name, KERNEL_TYPE_STRING);
351 if (ret < 0)
352 return ret;
353 dev_err(&usbdev->dev, "GCT Emergency: Kernel download success.\n");
354
355 ret = em_download_image(usbdev, fs_name, FS_TYPE_STRING);
356 if (ret < 0)
357 return ret;
358 dev_info(&usbdev->dev, "GCT Emergency: Filesystem download success.\n");
359
360 ret = em_fw_reset(usbdev);
361
362 return ret;
363 }
364