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Linux/sound/usb/6fire/firmware.c

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  1 /*
  2  * Linux driver for TerraTec DMX 6Fire USB
  3  *
  4  * Firmware loader
  5  *
  6  * Author:      Torsten Schenk <torsten.schenk@zoho.com>
  7  * Created:     Jan 01, 2011
  8  * Copyright:   (C) Torsten Schenk
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  */
 15 
 16 #include <linux/firmware.h>
 17 #include <linux/module.h>
 18 #include <linux/bitrev.h>
 19 #include <linux/kernel.h>
 20 
 21 #include "firmware.h"
 22 #include "chip.h"
 23 
 24 MODULE_FIRMWARE("6fire/dmx6firel2.ihx");
 25 MODULE_FIRMWARE("6fire/dmx6fireap.ihx");
 26 MODULE_FIRMWARE("6fire/dmx6firecf.bin");
 27 
 28 enum {
 29         FPGA_BUFSIZE = 512, FPGA_EP = 2
 30 };
 31 
 32 /*
 33  * wMaxPacketSize of pcm endpoints.
 34  * keep synced with rates_in_packet_size and rates_out_packet_size in pcm.c
 35  * fpp: frames per isopacket
 36  *
 37  * CAUTION: keep sizeof <= buffer[] in usb6fire_fw_init
 38  */
 39 static const u8 ep_w_max_packet_size[] = {
 40         0xe4, 0x00, 0xe4, 0x00, /* alt 1: 228 EP2 and EP6 (7 fpp) */
 41         0xa4, 0x01, 0xa4, 0x01, /* alt 2: 420 EP2 and EP6 (13 fpp)*/
 42         0x94, 0x01, 0x5c, 0x02  /* alt 3: 404 EP2 and 604 EP6 (25 fpp) */
 43 };
 44 
 45 static const u8 known_fw_versions[][2] = {
 46         { 0x03, 0x01 }
 47 };
 48 
 49 struct ihex_record {
 50         u16 address;
 51         u8 len;
 52         u8 data[256];
 53         char error; /* true if an error occurred parsing this record */
 54 
 55         u8 max_len; /* maximum record length in whole ihex */
 56 
 57         /* private */
 58         const char *txt_data;
 59         unsigned int txt_length;
 60         unsigned int txt_offset; /* current position in txt_data */
 61 };
 62 
 63 static u8 usb6fire_fw_ihex_hex(const u8 *data, u8 *crc)
 64 {
 65         u8 val = 0;
 66         int hval;
 67 
 68         hval = hex_to_bin(data[0]);
 69         if (hval >= 0)
 70                 val |= (hval << 4);
 71 
 72         hval = hex_to_bin(data[1]);
 73         if (hval >= 0)
 74                 val |= hval;
 75 
 76         *crc += val;
 77         return val;
 78 }
 79 
 80 /*
 81  * returns true if record is available, false otherwise.
 82  * iff an error occurred, false will be returned and record->error will be true.
 83  */
 84 static bool usb6fire_fw_ihex_next_record(struct ihex_record *record)
 85 {
 86         u8 crc = 0;
 87         u8 type;
 88         int i;
 89 
 90         record->error = false;
 91 
 92         /* find begin of record (marked by a colon) */
 93         while (record->txt_offset < record->txt_length
 94                         && record->txt_data[record->txt_offset] != ':')
 95                 record->txt_offset++;
 96         if (record->txt_offset == record->txt_length)
 97                 return false;
 98 
 99         /* number of characters needed for len, addr and type entries */
100         record->txt_offset++;
101         if (record->txt_offset + 8 > record->txt_length) {
102                 record->error = true;
103                 return false;
104         }
105 
106         record->len = usb6fire_fw_ihex_hex(record->txt_data +
107                         record->txt_offset, &crc);
108         record->txt_offset += 2;
109         record->address = usb6fire_fw_ihex_hex(record->txt_data +
110                         record->txt_offset, &crc) << 8;
111         record->txt_offset += 2;
112         record->address |= usb6fire_fw_ihex_hex(record->txt_data +
113                         record->txt_offset, &crc);
114         record->txt_offset += 2;
115         type = usb6fire_fw_ihex_hex(record->txt_data +
116                         record->txt_offset, &crc);
117         record->txt_offset += 2;
118 
119         /* number of characters needed for data and crc entries */
120         if (record->txt_offset + 2 * (record->len + 1) > record->txt_length) {
121                 record->error = true;
122                 return false;
123         }
124         for (i = 0; i < record->len; i++) {
125                 record->data[i] = usb6fire_fw_ihex_hex(record->txt_data
126                                 + record->txt_offset, &crc);
127                 record->txt_offset += 2;
128         }
129         usb6fire_fw_ihex_hex(record->txt_data + record->txt_offset, &crc);
130         if (crc) {
131                 record->error = true;
132                 return false;
133         }
134 
135         if (type == 1 || !record->len) /* eof */
136                 return false;
137         else if (type == 0)
138                 return true;
139         else {
140                 record->error = true;
141                 return false;
142         }
143 }
144 
145 static int usb6fire_fw_ihex_init(const struct firmware *fw,
146                 struct ihex_record *record)
147 {
148         record->txt_data = fw->data;
149         record->txt_length = fw->size;
150         record->txt_offset = 0;
151         record->max_len = 0;
152         /* read all records, if loop ends, record->error indicates,
153          * whether ihex is valid. */
154         while (usb6fire_fw_ihex_next_record(record))
155                 record->max_len = max(record->len, record->max_len);
156         if (record->error)
157                 return -EINVAL;
158         record->txt_offset = 0;
159         return 0;
160 }
161 
162 static int usb6fire_fw_ezusb_write(struct usb_device *device,
163                 int type, int value, char *data, int len)
164 {
165         int ret;
166 
167         ret = usb_control_msg(device, usb_sndctrlpipe(device, 0), type,
168                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
169                         value, 0, data, len, HZ);
170         if (ret < 0)
171                 return ret;
172         else if (ret != len)
173                 return -EIO;
174         return 0;
175 }
176 
177 static int usb6fire_fw_ezusb_read(struct usb_device *device,
178                 int type, int value, char *data, int len)
179 {
180         int ret = usb_control_msg(device, usb_rcvctrlpipe(device, 0), type,
181                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, value,
182                         0, data, len, HZ);
183         if (ret < 0)
184                 return ret;
185         else if (ret != len)
186                 return -EIO;
187         return 0;
188 }
189 
190 static int usb6fire_fw_fpga_write(struct usb_device *device,
191                 char *data, int len)
192 {
193         int actual_len;
194         int ret;
195 
196         ret = usb_bulk_msg(device, usb_sndbulkpipe(device, FPGA_EP), data, len,
197                         &actual_len, HZ);
198         if (ret < 0)
199                 return ret;
200         else if (actual_len != len)
201                 return -EIO;
202         return 0;
203 }
204 
205 static int usb6fire_fw_ezusb_upload(
206                 struct usb_interface *intf, const char *fwname,
207                 unsigned int postaddr, u8 *postdata, unsigned int postlen)
208 {
209         int ret;
210         u8 data;
211         struct usb_device *device = interface_to_usbdev(intf);
212         const struct firmware *fw = NULL;
213         struct ihex_record *rec = kmalloc(sizeof(struct ihex_record),
214                         GFP_KERNEL);
215 
216         if (!rec)
217                 return -ENOMEM;
218 
219         ret = request_firmware(&fw, fwname, &device->dev);
220         if (ret < 0) {
221                 kfree(rec);
222                 snd_printk(KERN_ERR PREFIX "error requesting ezusb "
223                                 "firmware %s.\n", fwname);
224                 return ret;
225         }
226         ret = usb6fire_fw_ihex_init(fw, rec);
227         if (ret < 0) {
228                 kfree(rec);
229                 release_firmware(fw);
230                 snd_printk(KERN_ERR PREFIX "error validating ezusb "
231                                 "firmware %s.\n", fwname);
232                 return ret;
233         }
234         /* upload firmware image */
235         data = 0x01; /* stop ezusb cpu */
236         ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
237         if (ret < 0) {
238                 kfree(rec);
239                 release_firmware(fw);
240                 snd_printk(KERN_ERR PREFIX "unable to upload ezusb "
241                                 "firmware %s: begin message.\n", fwname);
242                 return ret;
243         }
244 
245         while (usb6fire_fw_ihex_next_record(rec)) { /* write firmware */
246                 ret = usb6fire_fw_ezusb_write(device, 0xa0, rec->address,
247                                 rec->data, rec->len);
248                 if (ret < 0) {
249                         kfree(rec);
250                         release_firmware(fw);
251                         snd_printk(KERN_ERR PREFIX "unable to upload ezusb "
252                                         "firmware %s: data urb.\n", fwname);
253                         return ret;
254                 }
255         }
256 
257         release_firmware(fw);
258         kfree(rec);
259         if (postdata) { /* write data after firmware has been uploaded */
260                 ret = usb6fire_fw_ezusb_write(device, 0xa0, postaddr,
261                                 postdata, postlen);
262                 if (ret < 0) {
263                         snd_printk(KERN_ERR PREFIX "unable to upload ezusb "
264                                         "firmware %s: post urb.\n", fwname);
265                         return ret;
266                 }
267         }
268 
269         data = 0x00; /* resume ezusb cpu */
270         ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
271         if (ret < 0) {
272                 snd_printk(KERN_ERR PREFIX "unable to upload ezusb "
273                                 "firmware %s: end message.\n", fwname);
274                 return ret;
275         }
276         return 0;
277 }
278 
279 static int usb6fire_fw_fpga_upload(
280                 struct usb_interface *intf, const char *fwname)
281 {
282         int ret;
283         int i;
284         struct usb_device *device = interface_to_usbdev(intf);
285         u8 *buffer = kmalloc(FPGA_BUFSIZE, GFP_KERNEL);
286         const char *c;
287         const char *end;
288         const struct firmware *fw;
289 
290         if (!buffer)
291                 return -ENOMEM;
292 
293         ret = request_firmware(&fw, fwname, &device->dev);
294         if (ret < 0) {
295                 snd_printk(KERN_ERR PREFIX "unable to get fpga firmware %s.\n",
296                                 fwname);
297                 kfree(buffer);
298                 return -EIO;
299         }
300 
301         c = fw->data;
302         end = fw->data + fw->size;
303 
304         ret = usb6fire_fw_ezusb_write(device, 8, 0, NULL, 0);
305         if (ret < 0) {
306                 kfree(buffer);
307                 release_firmware(fw);
308                 snd_printk(KERN_ERR PREFIX "unable to upload fpga firmware: "
309                                 "begin urb.\n");
310                 return ret;
311         }
312 
313         while (c != end) {
314                 for (i = 0; c != end && i < FPGA_BUFSIZE; i++, c++)
315                         buffer[i] = byte_rev_table[(u8) *c];
316 
317                 ret = usb6fire_fw_fpga_write(device, buffer, i);
318                 if (ret < 0) {
319                         release_firmware(fw);
320                         kfree(buffer);
321                         snd_printk(KERN_ERR PREFIX "unable to upload fpga "
322                                         "firmware: fw urb.\n");
323                         return ret;
324                 }
325         }
326         release_firmware(fw);
327         kfree(buffer);
328 
329         ret = usb6fire_fw_ezusb_write(device, 9, 0, NULL, 0);
330         if (ret < 0) {
331                 snd_printk(KERN_ERR PREFIX "unable to upload fpga firmware: "
332                                 "end urb.\n");
333                 return ret;
334         }
335         return 0;
336 }
337 
338 /* check, if the firmware version the devices has currently loaded
339  * is known by this driver. 'version' needs to have 4 bytes version
340  * info data. */
341 static int usb6fire_fw_check(u8 *version)
342 {
343         int i;
344 
345         for (i = 0; i < ARRAY_SIZE(known_fw_versions); i++)
346                 if (!memcmp(version, known_fw_versions + i, 2))
347                         return 0;
348 
349         snd_printk(KERN_ERR PREFIX "invalid fimware version in device: %*ph. "
350                         "please reconnect to power. if this failure "
351                         "still happens, check your firmware installation.",
352                         4, version);
353         return -EINVAL;
354 }
355 
356 int usb6fire_fw_init(struct usb_interface *intf)
357 {
358         int i;
359         int ret;
360         struct usb_device *device = interface_to_usbdev(intf);
361         /* buffer: 8 receiving bytes from device and
362          * sizeof(EP_W_MAX_PACKET_SIZE) bytes for non-const copy */
363         u8 buffer[12];
364 
365         ret = usb6fire_fw_ezusb_read(device, 1, 0, buffer, 8);
366         if (ret < 0) {
367                 snd_printk(KERN_ERR PREFIX "unable to receive device "
368                                 "firmware state.\n");
369                 return ret;
370         }
371         if (buffer[0] != 0xeb || buffer[1] != 0xaa || buffer[2] != 0x55) {
372                 snd_printk(KERN_ERR PREFIX "unknown device firmware state "
373                                 "received from device: ");
374                 for (i = 0; i < 8; i++)
375                         snd_printk("%02x ", buffer[i]);
376                 snd_printk("\n");
377                 return -EIO;
378         }
379         /* do we need fpga loader ezusb firmware? */
380         if (buffer[3] == 0x01) {
381                 ret = usb6fire_fw_ezusb_upload(intf,
382                                 "6fire/dmx6firel2.ihx", 0, NULL, 0);
383                 if (ret < 0)
384                         return ret;
385                 return FW_NOT_READY;
386         }
387         /* do we need fpga firmware and application ezusb firmware? */
388         else if (buffer[3] == 0x02) {
389                 ret = usb6fire_fw_check(buffer + 4);
390                 if (ret < 0)
391                         return ret;
392                 ret = usb6fire_fw_fpga_upload(intf, "6fire/dmx6firecf.bin");
393                 if (ret < 0)
394                         return ret;
395                 memcpy(buffer, ep_w_max_packet_size,
396                                 sizeof(ep_w_max_packet_size));
397                 ret = usb6fire_fw_ezusb_upload(intf, "6fire/dmx6fireap.ihx",
398                                 0x0003, buffer, sizeof(ep_w_max_packet_size));
399                 if (ret < 0)
400                         return ret;
401                 return FW_NOT_READY;
402         }
403         /* all fw loaded? */
404         else if (buffer[3] == 0x03)
405                 return usb6fire_fw_check(buffer + 4);
406         /* unknown data? */
407         else {
408                 snd_printk(KERN_ERR PREFIX "unknown device firmware state "
409                                 "received from device: ");
410                 for (i = 0; i < 8; i++)
411                         snd_printk("%02x ", buffer[i]);
412                 snd_printk("\n");
413                 return -EIO;
414         }
415         return 0;
416 }
417 
418 

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