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Abhay Salunke6c54c282005-09-06 15:17:14 -07001/*
2 * dell_rbu.c
3 * Bios Update driver for Dell systems
4 * Author: Dell Inc
5 * Abhay Salunke <abhay_salunke@dell.com>
6 *
7 * Copyright (C) 2005 Dell Inc.
8 *
9 * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by
10 * creating entries in the /sys file systems on Linux 2.6 and higher
11 * kernels. The driver supports two mechanism to update the BIOS namely
12 * contiguous and packetized. Both these methods still require having some
13 * application to set the CMOS bit indicating the BIOS to update itself
14 * after a reboot.
15 *
16 * Contiguous method:
17 * This driver writes the incoming data in a monolithic image by allocating
18 * contiguous physical pages large enough to accommodate the incoming BIOS
19 * image size.
20 *
21 * Packetized method:
22 * The driver writes the incoming packet image by allocating a new packet
23 * on every time the packet data is written. This driver requires an
24 * application to break the BIOS image in to fixed sized packet chunks.
25 *
26 * See Documentation/dell_rbu.txt for more info.
27 *
28 * This program is free software; you can redistribute it and/or modify
29 * it under the terms of the GNU General Public License v2.0 as published by
30 * the Free Software Foundation
31 *
32 * This program is distributed in the hope that it will be useful,
33 * but WITHOUT ANY WARRANTY; without even the implied warranty of
34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
35 * GNU General Public License for more details.
36 */
Abhay Salunke6c54c282005-09-06 15:17:14 -070037#include <linux/init.h>
38#include <linux/module.h>
39#include <linux/string.h>
40#include <linux/errno.h>
41#include <linux/blkdev.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010042#include <linux/platform_device.h>
Abhay Salunke6c54c282005-09-06 15:17:14 -070043#include <linux/spinlock.h>
44#include <linux/moduleparam.h>
45#include <linux/firmware.h>
46#include <linux/dma-mapping.h>
47
48MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
49MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
50MODULE_LICENSE("GPL");
Abhay Salunke2c560842006-01-14 13:21:14 -080051MODULE_VERSION("3.2");
Abhay Salunke6c54c282005-09-06 15:17:14 -070052
53#define BIOS_SCAN_LIMIT 0xffffffff
54#define MAX_IMAGE_LENGTH 16
55static struct _rbu_data {
56 void *image_update_buffer;
57 unsigned long image_update_buffer_size;
58 unsigned long bios_image_size;
59 int image_update_ordernum;
60 int dma_alloc;
61 spinlock_t lock;
62 unsigned long packet_read_count;
Abhay Salunke6c54c282005-09-06 15:17:14 -070063 unsigned long num_packets;
64 unsigned long packetsize;
Abhay Salunkead6ce872005-10-11 08:29:02 -070065 unsigned long imagesize;
Abhay Salunkee61c0e32005-09-16 19:28:04 -070066 int entry_created;
Abhay Salunke6c54c282005-09-06 15:17:14 -070067} rbu_data;
68
Abhay Salunkee61c0e32005-09-16 19:28:04 -070069static char image_type[MAX_IMAGE_LENGTH + 1] = "mono";
70module_param_string(image_type, image_type, sizeof (image_type), 0);
Abhay Salunkead6ce872005-10-11 08:29:02 -070071MODULE_PARM_DESC(image_type,
72 "BIOS image type. choose- mono or packet or init");
Abhay Salunke6c54c282005-09-06 15:17:14 -070073
Abhay Salunke274b6932005-11-07 00:59:26 -080074static unsigned long allocation_floor = 0x100000;
75module_param(allocation_floor, ulong, 0644);
76MODULE_PARM_DESC(allocation_floor,
77 "Minimum address for allocations when using Packet mode");
78
Abhay Salunke6c54c282005-09-06 15:17:14 -070079struct packet_data {
80 struct list_head list;
81 size_t length;
82 void *data;
83 int ordernum;
84};
85
86static struct packet_data packet_data_head;
87
88static struct platform_device *rbu_device;
89static int context;
90static dma_addr_t dell_rbu_dmaaddr;
91
Andrew Mortondda85772005-09-16 19:28:05 -070092static void init_packet_head(void)
Abhay Salunke6c54c282005-09-06 15:17:14 -070093{
94 INIT_LIST_HEAD(&packet_data_head.list);
Abhay Salunke6c54c282005-09-06 15:17:14 -070095 rbu_data.packet_read_count = 0;
96 rbu_data.num_packets = 0;
97 rbu_data.packetsize = 0;
Abhay Salunkead6ce872005-10-11 08:29:02 -070098 rbu_data.imagesize = 0;
Abhay Salunke6c54c282005-09-06 15:17:14 -070099}
100
Abhay Salunkead6ce872005-10-11 08:29:02 -0700101static int create_packet(void *data, size_t length)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700102{
103 struct packet_data *newpacket;
104 int ordernum = 0;
Abhay Salunke274b6932005-11-07 00:59:26 -0800105 int retval = 0;
106 unsigned int packet_array_size = 0;
Al Viro5ad92012005-12-15 09:18:00 +0000107 void **invalid_addr_packet_array = NULL;
108 void *packet_data_temp_buf = NULL;
Abhay Salunke274b6932005-11-07 00:59:26 -0800109 unsigned int idx = 0;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700110
111 pr_debug("create_packet: entry \n");
112
113 if (!rbu_data.packetsize) {
114 pr_debug("create_packet: packetsize not specified\n");
Abhay Salunke274b6932005-11-07 00:59:26 -0800115 retval = -EINVAL;
116 goto out_noalloc;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700117 }
Abhay Salunke274b6932005-11-07 00:59:26 -0800118
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700119 spin_unlock(&rbu_data.lock);
Abhay Salunke274b6932005-11-07 00:59:26 -0800120
121 newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700122
Abhay Salunke6c54c282005-09-06 15:17:14 -0700123 if (!newpacket) {
124 printk(KERN_WARNING
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700125 "dell_rbu:%s: failed to allocate new "
126 "packet\n", __FUNCTION__);
Abhay Salunke274b6932005-11-07 00:59:26 -0800127 retval = -ENOMEM;
128 spin_lock(&rbu_data.lock);
129 goto out_noalloc;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700130 }
131
132 ordernum = get_order(length);
Abhay Salunke274b6932005-11-07 00:59:26 -0800133
Abhay Salunke6c54c282005-09-06 15:17:14 -0700134 /*
Abhay Salunke274b6932005-11-07 00:59:26 -0800135 * BIOS errata mean we cannot allocate packets below 1MB or they will
136 * be overwritten by BIOS.
137 *
138 * array to temporarily hold packets
139 * that are below the allocation floor
140 *
141 * NOTE: very simplistic because we only need the floor to be at 1MB
142 * due to BIOS errata. This shouldn't be used for higher floors
143 * or you will run out of mem trying to allocate the array.
Abhay Salunke6c54c282005-09-06 15:17:14 -0700144 */
Abhay Salunke274b6932005-11-07 00:59:26 -0800145 packet_array_size = max(
146 (unsigned int)(allocation_floor / rbu_data.packetsize),
147 (unsigned int)1);
148 invalid_addr_packet_array = kzalloc(packet_array_size * sizeof(void*),
149 GFP_KERNEL);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700150
Abhay Salunke274b6932005-11-07 00:59:26 -0800151 if (!invalid_addr_packet_array) {
Abhay Salunke6c54c282005-09-06 15:17:14 -0700152 printk(KERN_WARNING
Abhay Salunke274b6932005-11-07 00:59:26 -0800153 "dell_rbu:%s: failed to allocate "
154 "invalid_addr_packet_array \n",
155 __FUNCTION__);
156 retval = -ENOMEM;
157 spin_lock(&rbu_data.lock);
158 goto out_alloc_packet;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700159 }
160
Abhay Salunke274b6932005-11-07 00:59:26 -0800161 while (!packet_data_temp_buf) {
162 packet_data_temp_buf = (unsigned char *)
163 __get_free_pages(GFP_KERNEL, ordernum);
164 if (!packet_data_temp_buf) {
165 printk(KERN_WARNING
166 "dell_rbu:%s: failed to allocate new "
167 "packet\n", __FUNCTION__);
168 retval = -ENOMEM;
169 spin_lock(&rbu_data.lock);
170 goto out_alloc_packet_array;
171 }
172
173 if ((unsigned long)virt_to_phys(packet_data_temp_buf)
174 < allocation_floor) {
175 pr_debug("packet 0x%lx below floor at 0x%lx.\n",
176 (unsigned long)virt_to_phys(
177 packet_data_temp_buf),
178 allocation_floor);
179 invalid_addr_packet_array[idx++] = packet_data_temp_buf;
Al Viro5ad92012005-12-15 09:18:00 +0000180 packet_data_temp_buf = NULL;
Abhay Salunke274b6932005-11-07 00:59:26 -0800181 }
182 }
183 spin_lock(&rbu_data.lock);
184
185 newpacket->data = packet_data_temp_buf;
186
187 pr_debug("create_packet: newpacket at physical addr %lx\n",
188 (unsigned long)virt_to_phys(newpacket->data));
189
190 /* packets may not have fixed size */
191 newpacket->length = length;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700192 newpacket->ordernum = ordernum;
193 ++rbu_data.num_packets;
Abhay Salunke274b6932005-11-07 00:59:26 -0800194
195 /* initialize the newly created packet headers */
Abhay Salunke6c54c282005-09-06 15:17:14 -0700196 INIT_LIST_HEAD(&newpacket->list);
197 list_add_tail(&newpacket->list, &packet_data_head.list);
Abhay Salunkead6ce872005-10-11 08:29:02 -0700198
199 memcpy(newpacket->data, data, length);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700200
201 pr_debug("create_packet: exit \n");
202
Abhay Salunke274b6932005-11-07 00:59:26 -0800203out_alloc_packet_array:
204 /* always free packet array */
205 for (;idx>0;idx--) {
206 pr_debug("freeing unused packet below floor 0x%lx.\n",
207 (unsigned long)virt_to_phys(
208 invalid_addr_packet_array[idx-1]));
209 free_pages((unsigned long)invalid_addr_packet_array[idx-1],
210 ordernum);
211 }
212 kfree(invalid_addr_packet_array);
213
214out_alloc_packet:
215 /* if error, free data */
216 if (retval)
217 kfree(newpacket);
218
219out_noalloc:
220 return retval;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700221}
222
Andrew Mortondda85772005-09-16 19:28:05 -0700223static int packetize_data(void *data, size_t length)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700224{
225 int rc = 0;
Abhay Salunkead6ce872005-10-11 08:29:02 -0700226 int done = 0;
227 int packet_length;
228 u8 *temp;
229 u8 *end = (u8 *) data + length;
Zach Browncb7cf572006-10-03 01:16:09 -0700230 pr_debug("packetize_data: data length %zd\n", length);
Abhay Salunkead6ce872005-10-11 08:29:02 -0700231 if (!rbu_data.packetsize) {
232 printk(KERN_WARNING
233 "dell_rbu: packetsize not specified\n");
234 return -EIO;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700235 }
Abhay Salunkead6ce872005-10-11 08:29:02 -0700236
237 temp = (u8 *) data;
238
239 /* packetize the hunk */
240 while (!done) {
241 if ((temp + rbu_data.packetsize) < end)
242 packet_length = rbu_data.packetsize;
243 else {
244 /* this is the last packet */
245 packet_length = end - temp;
246 done = 1;
247 }
248
249 if ((rc = create_packet(temp, packet_length)))
250 return rc;
251
Andrew Morton9e42ef72006-10-11 01:22:13 -0700252 pr_debug("%p:%td\n", temp, (end - temp));
Abhay Salunkead6ce872005-10-11 08:29:02 -0700253 temp += packet_length;
254 }
255
256 rbu_data.imagesize = length;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700257
258 return rc;
259}
260
Andrew Mortondda85772005-09-16 19:28:05 -0700261static int do_packet_read(char *data, struct list_head *ptemp_list,
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700262 int length, int bytes_read, int *list_read_count)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700263{
264 void *ptemp_buf;
265 struct packet_data *newpacket = NULL;
266 int bytes_copied = 0;
267 int j = 0;
268
269 newpacket = list_entry(ptemp_list, struct packet_data, list);
270 *list_read_count += newpacket->length;
271
272 if (*list_read_count > bytes_read) {
273 /* point to the start of unread data */
274 j = newpacket->length - (*list_read_count - bytes_read);
275 /* point to the offset in the packet buffer */
276 ptemp_buf = (u8 *) newpacket->data + j;
277 /*
278 * check if there is enough room in
279 * * the incoming buffer
280 */
281 if (length > (*list_read_count - bytes_read))
282 /*
283 * copy what ever is there in this
284 * packet and move on
285 */
286 bytes_copied = (*list_read_count - bytes_read);
287 else
288 /* copy the remaining */
289 bytes_copied = length;
290 memcpy(data, ptemp_buf, bytes_copied);
291 }
292 return bytes_copied;
293}
294
Abhay Salunkead6ce872005-10-11 08:29:02 -0700295static int packet_read_list(char *data, size_t * pread_length)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700296{
297 struct list_head *ptemp_list;
298 int temp_count = 0;
299 int bytes_copied = 0;
300 int bytes_read = 0;
301 int remaining_bytes = 0;
302 char *pdest = data;
303
304 /* check if we have any packets */
305 if (0 == rbu_data.num_packets)
306 return -ENOMEM;
307
308 remaining_bytes = *pread_length;
309 bytes_read = rbu_data.packet_read_count;
310
311 ptemp_list = (&packet_data_head.list)->next;
312 while (!list_empty(ptemp_list)) {
313 bytes_copied = do_packet_read(pdest, ptemp_list,
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700314 remaining_bytes, bytes_read, &temp_count);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700315 remaining_bytes -= bytes_copied;
316 bytes_read += bytes_copied;
317 pdest += bytes_copied;
318 /*
319 * check if we reached end of buffer before reaching the
320 * last packet
321 */
322 if (remaining_bytes == 0)
323 break;
324
325 ptemp_list = ptemp_list->next;
326 }
327 /*finally set the bytes read */
328 *pread_length = bytes_read - rbu_data.packet_read_count;
329 rbu_data.packet_read_count = bytes_read;
330 return 0;
331}
332
Andrew Mortondda85772005-09-16 19:28:05 -0700333static void packet_empty_list(void)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700334{
335 struct list_head *ptemp_list;
336 struct list_head *pnext_list;
337 struct packet_data *newpacket;
338
339 ptemp_list = (&packet_data_head.list)->next;
340 while (!list_empty(ptemp_list)) {
341 newpacket =
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700342 list_entry(ptemp_list, struct packet_data, list);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700343 pnext_list = ptemp_list->next;
344 list_del(ptemp_list);
345 ptemp_list = pnext_list;
346 /*
347 * zero out the RBU packet memory before freeing
348 * to make sure there are no stale RBU packets left in memory
349 */
350 memset(newpacket->data, 0, rbu_data.packetsize);
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700351 free_pages((unsigned long) newpacket->data,
352 newpacket->ordernum);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700353 kfree(newpacket);
354 }
Abhay Salunke6c54c282005-09-06 15:17:14 -0700355 rbu_data.packet_read_count = 0;
356 rbu_data.num_packets = 0;
Abhay Salunkead6ce872005-10-11 08:29:02 -0700357 rbu_data.imagesize = 0;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700358}
359
360/*
361 * img_update_free: Frees the buffer allocated for storing BIOS image
362 * Always called with lock held and returned with lock held
363 */
Andrew Mortondda85772005-09-16 19:28:05 -0700364static void img_update_free(void)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700365{
366 if (!rbu_data.image_update_buffer)
367 return;
368 /*
369 * zero out this buffer before freeing it to get rid of any stale
370 * BIOS image copied in memory.
371 */
372 memset(rbu_data.image_update_buffer, 0,
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700373 rbu_data.image_update_buffer_size);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700374 if (rbu_data.dma_alloc == 1)
375 dma_free_coherent(NULL, rbu_data.bios_image_size,
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700376 rbu_data.image_update_buffer, dell_rbu_dmaaddr);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700377 else
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700378 free_pages((unsigned long) rbu_data.image_update_buffer,
379 rbu_data.image_update_ordernum);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700380
381 /*
382 * Re-initialize the rbu_data variables after a free
383 */
384 rbu_data.image_update_ordernum = -1;
385 rbu_data.image_update_buffer = NULL;
386 rbu_data.image_update_buffer_size = 0;
387 rbu_data.bios_image_size = 0;
388 rbu_data.dma_alloc = 0;
389}
390
391/*
392 * img_update_realloc: This function allocates the contiguous pages to
393 * accommodate the requested size of data. The memory address and size
394 * values are stored globally and on every call to this function the new
395 * size is checked to see if more data is required than the existing size.
396 * If true the previous memory is freed and new allocation is done to
397 * accommodate the new size. If the incoming size is less then than the
398 * already allocated size, then that memory is reused. This function is
399 * called with lock held and returns with lock held.
400 */
Andrew Mortondda85772005-09-16 19:28:05 -0700401static int img_update_realloc(unsigned long size)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700402{
403 unsigned char *image_update_buffer = NULL;
404 unsigned long rc;
405 unsigned long img_buf_phys_addr;
406 int ordernum;
407 int dma_alloc = 0;
408
409 /*
410 * check if the buffer of sufficient size has been
411 * already allocated
412 */
413 if (rbu_data.image_update_buffer_size >= size) {
414 /*
415 * check for corruption
416 */
417 if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
418 printk(KERN_ERR "dell_rbu:%s: corruption "
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700419 "check failed\n", __FUNCTION__);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700420 return -EINVAL;
421 }
422 /*
423 * we have a valid pre-allocated buffer with
424 * sufficient size
425 */
426 return 0;
427 }
428
429 /*
430 * free any previously allocated buffer
431 */
432 img_update_free();
433
434 spin_unlock(&rbu_data.lock);
435
436 ordernum = get_order(size);
437 image_update_buffer =
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700438 (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700439
440 img_buf_phys_addr =
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700441 (unsigned long) virt_to_phys(image_update_buffer);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700442
443 if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700444 free_pages((unsigned long) image_update_buffer, ordernum);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700445 ordernum = -1;
446 image_update_buffer = dma_alloc_coherent(NULL, size,
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700447 &dell_rbu_dmaaddr, GFP_KERNEL);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700448 dma_alloc = 1;
449 }
450
451 spin_lock(&rbu_data.lock);
452
453 if (image_update_buffer != NULL) {
454 rbu_data.image_update_buffer = image_update_buffer;
455 rbu_data.image_update_buffer_size = size;
456 rbu_data.bios_image_size =
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700457 rbu_data.image_update_buffer_size;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700458 rbu_data.image_update_ordernum = ordernum;
459 rbu_data.dma_alloc = dma_alloc;
460 rc = 0;
461 } else {
462 pr_debug("Not enough memory for image update:"
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700463 "size = %ld\n", size);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700464 rc = -ENOMEM;
465 }
466
467 return rc;
468}
469
Andrew Mortondda85772005-09-16 19:28:05 -0700470static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700471{
472 int retval;
473 size_t bytes_left;
474 size_t data_length;
475 char *ptempBuf = buffer;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700476
477 /* check to see if we have something to return */
478 if (rbu_data.num_packets == 0) {
479 pr_debug("read_packet_data: no packets written\n");
480 retval = -ENOMEM;
481 goto read_rbu_data_exit;
482 }
483
Abhay Salunkead6ce872005-10-11 08:29:02 -0700484 if (pos > rbu_data.imagesize) {
Abhay Salunke6c54c282005-09-06 15:17:14 -0700485 retval = 0;
486 printk(KERN_WARNING "dell_rbu:read_packet_data: "
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700487 "data underrun\n");
Abhay Salunke6c54c282005-09-06 15:17:14 -0700488 goto read_rbu_data_exit;
489 }
490
Abhay Salunkead6ce872005-10-11 08:29:02 -0700491 bytes_left = rbu_data.imagesize - pos;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700492 data_length = min(bytes_left, count);
493
494 if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
495 goto read_rbu_data_exit;
496
Abhay Salunkead6ce872005-10-11 08:29:02 -0700497 if ((pos + count) > rbu_data.imagesize) {
Abhay Salunke6c54c282005-09-06 15:17:14 -0700498 rbu_data.packet_read_count = 0;
499 /* this was the last copy */
500 retval = bytes_left;
501 } else
502 retval = count;
503
504 read_rbu_data_exit:
505 return retval;
506}
507
Andrew Mortondda85772005-09-16 19:28:05 -0700508static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700509{
510 unsigned char *ptemp = NULL;
511 size_t bytes_left = 0;
512 size_t data_length = 0;
513 ssize_t ret_count = 0;
514
515 /* check to see if we have something to return */
516 if ((rbu_data.image_update_buffer == NULL) ||
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700517 (rbu_data.bios_image_size == 0)) {
Abhay Salunke6c54c282005-09-06 15:17:14 -0700518 pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700519 "bios_image_size %lu\n",
520 rbu_data.image_update_buffer,
521 rbu_data.bios_image_size);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700522 ret_count = -ENOMEM;
523 goto read_rbu_data_exit;
524 }
525
526 if (pos > rbu_data.bios_image_size) {
527 ret_count = 0;
528 goto read_rbu_data_exit;
529 }
530
531 bytes_left = rbu_data.bios_image_size - pos;
532 data_length = min(bytes_left, count);
533
534 ptemp = rbu_data.image_update_buffer;
535 memcpy(buffer, (ptemp + pos), data_length);
536
537 if ((pos + count) > rbu_data.bios_image_size)
538 /* this was the last copy */
539 ret_count = bytes_left;
540 else
541 ret_count = count;
542 read_rbu_data_exit:
543 return ret_count;
544}
545
Andrew Mortondda85772005-09-16 19:28:05 -0700546static ssize_t read_rbu_data(struct kobject *kobj, char *buffer,
Abhay Salunkead6ce872005-10-11 08:29:02 -0700547 loff_t pos, size_t count)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700548{
549 ssize_t ret_count = 0;
550
551 spin_lock(&rbu_data.lock);
552
553 if (!strcmp(image_type, "mono"))
554 ret_count = read_rbu_mono_data(buffer, pos, count);
555 else if (!strcmp(image_type, "packet"))
556 ret_count = read_packet_data(buffer, pos, count);
557 else
558 pr_debug("read_rbu_data: invalid image type specified\n");
559
560 spin_unlock(&rbu_data.lock);
561 return ret_count;
562}
563
Andrew Mortondda85772005-09-16 19:28:05 -0700564static void callbackfn_rbu(const struct firmware *fw, void *context)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700565{
Abhay Salunke2c560842006-01-14 13:21:14 -0800566 rbu_data.entry_created = 0;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700567
Abhay Salunke2c560842006-01-14 13:21:14 -0800568 if (!fw || !fw->size)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700569 return;
570
571 spin_lock(&rbu_data.lock);
572 if (!strcmp(image_type, "mono")) {
573 if (!img_update_realloc(fw->size))
574 memcpy(rbu_data.image_update_buffer,
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700575 fw->data, fw->size);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700576 } else if (!strcmp(image_type, "packet")) {
Abhay Salunkead6ce872005-10-11 08:29:02 -0700577 /*
578 * we need to free previous packets if a
579 * new hunk of packets needs to be downloaded
580 */
581 packet_empty_list();
582 if (packetize_data(fw->data, fw->size))
583 /* Incase something goes wrong when we are
584 * in middle of packetizing the data, we
585 * need to free up whatever packets might
586 * have been created before we quit.
587 */
Abhay Salunke6c54c282005-09-06 15:17:14 -0700588 packet_empty_list();
Abhay Salunke6c54c282005-09-06 15:17:14 -0700589 } else
590 pr_debug("invalid image type specified.\n");
591 spin_unlock(&rbu_data.lock);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700592}
593
Andrew Mortondda85772005-09-16 19:28:05 -0700594static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer,
Abhay Salunkead6ce872005-10-11 08:29:02 -0700595 loff_t pos, size_t count)
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700596{
597 int size = 0;
598 if (!pos)
599 size = sprintf(buffer, "%s\n", image_type);
600 return size;
601}
602
Andrew Mortondda85772005-09-16 19:28:05 -0700603static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer,
Abhay Salunkead6ce872005-10-11 08:29:02 -0700604 loff_t pos, size_t count)
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700605{
606 int rc = count;
607 int req_firm_rc = 0;
608 int i;
609 spin_lock(&rbu_data.lock);
610 /*
611 * Find the first newline or space
612 */
613 for (i = 0; i < count; ++i)
614 if (buffer[i] == '\n' || buffer[i] == ' ') {
615 buffer[i] = '\0';
616 break;
617 }
618 if (i == count)
619 buffer[count] = '\0';
620
621 if (strstr(buffer, "mono"))
622 strcpy(image_type, "mono");
623 else if (strstr(buffer, "packet"))
624 strcpy(image_type, "packet");
625 else if (strstr(buffer, "init")) {
626 /*
627 * If due to the user error the driver gets in a bad
628 * state where even though it is loaded , the
629 * /sys/class/firmware/dell_rbu entries are missing.
630 * to cover this situation the user can recreate entries
631 * by writing init to image_type.
632 */
633 if (!rbu_data.entry_created) {
634 spin_unlock(&rbu_data.lock);
635 req_firm_rc = request_firmware_nowait(THIS_MODULE,
636 FW_ACTION_NOHOTPLUG, "dell_rbu",
637 &rbu_device->dev, &context,
638 callbackfn_rbu);
639 if (req_firm_rc) {
640 printk(KERN_ERR
641 "dell_rbu:%s request_firmware_nowait"
642 " failed %d\n", __FUNCTION__, rc);
643 rc = -EIO;
644 } else
645 rbu_data.entry_created = 1;
646
647 spin_lock(&rbu_data.lock);
648 }
649 } else {
650 printk(KERN_WARNING "dell_rbu: image_type is invalid\n");
651 spin_unlock(&rbu_data.lock);
652 return -EINVAL;
653 }
654
655 /* we must free all previous allocations */
656 packet_empty_list();
657 img_update_free();
658 spin_unlock(&rbu_data.lock);
659
660 return rc;
661}
662
Abhay Salunkead6ce872005-10-11 08:29:02 -0700663static ssize_t read_rbu_packet_size(struct kobject *kobj, char *buffer,
664 loff_t pos, size_t count)
665{
666 int size = 0;
667 if (!pos) {
668 spin_lock(&rbu_data.lock);
669 size = sprintf(buffer, "%lu\n", rbu_data.packetsize);
670 spin_unlock(&rbu_data.lock);
671 }
672 return size;
673}
674
675static ssize_t write_rbu_packet_size(struct kobject *kobj, char *buffer,
676 loff_t pos, size_t count)
677{
678 unsigned long temp;
679 spin_lock(&rbu_data.lock);
680 packet_empty_list();
681 sscanf(buffer, "%lu", &temp);
682 if (temp < 0xffffffff)
683 rbu_data.packetsize = temp;
684
685 spin_unlock(&rbu_data.lock);
686 return count;
687}
688
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700689static struct bin_attribute rbu_data_attr = {
Abhay Salunkead6ce872005-10-11 08:29:02 -0700690 .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700691 .read = read_rbu_data,
692};
693
694static struct bin_attribute rbu_image_type_attr = {
Abhay Salunkead6ce872005-10-11 08:29:02 -0700695 .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700696 .read = read_rbu_image_type,
697 .write = write_rbu_image_type,
698};
699
Abhay Salunkead6ce872005-10-11 08:29:02 -0700700static struct bin_attribute rbu_packet_size_attr = {
701 .attr = {.name = "packet_size",.owner = THIS_MODULE,.mode = 0644},
702 .read = read_rbu_packet_size,
703 .write = write_rbu_packet_size,
704};
705
Andrew Mortondda85772005-09-16 19:28:05 -0700706static int __init dcdrbu_init(void)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700707{
Akinobu Mita68970832006-11-16 01:19:25 -0800708 int rc;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700709 spin_lock_init(&rbu_data.lock);
710
711 init_packet_head();
Akinobu Mita68970832006-11-16 01:19:25 -0800712 rbu_device = platform_device_register_simple("dell_rbu", -1, NULL, 0);
713 if (IS_ERR(rbu_device)) {
Abhay Salunke6c54c282005-09-06 15:17:14 -0700714 printk(KERN_ERR
Abhay Salunkee61c0e32005-09-16 19:28:04 -0700715 "dell_rbu:%s:platform_device_register_simple "
716 "failed\n", __FUNCTION__);
Akinobu Mita68970832006-11-16 01:19:25 -0800717 return PTR_ERR(rbu_device);
Abhay Salunke6c54c282005-09-06 15:17:14 -0700718 }
719
Jeff Garzik41bfcfd2006-10-11 01:22:20 -0700720 rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
721 if (rc)
722 goto out_devreg;
723 rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
724 if (rc)
725 goto out_data;
726 rc = sysfs_create_bin_file(&rbu_device->dev.kobj,
Abhay Salunkead6ce872005-10-11 08:29:02 -0700727 &rbu_packet_size_attr);
Jeff Garzik41bfcfd2006-10-11 01:22:20 -0700728 if (rc)
729 goto out_imtype;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700730
Abhay Salunke2c560842006-01-14 13:21:14 -0800731 rbu_data.entry_created = 0;
Jeff Garzik41bfcfd2006-10-11 01:22:20 -0700732 return 0;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700733
Jeff Garzik41bfcfd2006-10-11 01:22:20 -0700734out_imtype:
735 sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
736out_data:
737 sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
738out_devreg:
739 platform_device_unregister(rbu_device);
740 return rc;
Abhay Salunke6c54c282005-09-06 15:17:14 -0700741}
742
Andrew Mortondda85772005-09-16 19:28:05 -0700743static __exit void dcdrbu_exit(void)
Abhay Salunke6c54c282005-09-06 15:17:14 -0700744{
745 spin_lock(&rbu_data.lock);
746 packet_empty_list();
747 img_update_free();
748 spin_unlock(&rbu_data.lock);
749 platform_device_unregister(rbu_device);
750}
751
752module_exit(dcdrbu_exit);
753module_init(dcdrbu_init);
Abhay Salunke274b6932005-11-07 00:59:26 -0800754
755/* vim:noet:ts=8:sw=8
756*/