Commit | Line | Data |
---|---|---|
dbdf04c4 MS |
1 | /* |
2 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2006 | |
3 | * | |
4 | * Author: Maxim Shchetynin <maxim@de.ibm.com> | |
5 | * | |
6 | * Axon DDR2 device driver. | |
7 | * It registers one block device per Axon's DDR2 memory bank found on a system. | |
8 | * Block devices are called axonram?, their major and minor numbers are | |
9 | * available in /proc/devices, /proc/partitions or in /sys/block/axonram?/dev. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2, or (at your option) | |
14 | * any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/bio.h> | |
27 | #include <linux/blkdev.h> | |
28 | #include <linux/buffer_head.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/fs.h> | |
32 | #include <linux/genhd.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/io.h> | |
35 | #include <linux/ioport.h> | |
36 | #include <linux/irq.h> | |
37 | #include <linux/irqreturn.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/mm.h> | |
40 | #include <linux/mod_devicetable.h> | |
41 | #include <linux/module.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/types.h> | |
eb8f2763 JL |
45 | #include <linux/of_device.h> |
46 | #include <linux/of_platform.h> | |
47 | ||
dbdf04c4 MS |
48 | #include <asm/page.h> |
49 | #include <asm/prom.h> | |
50 | ||
51 | #define AXON_RAM_MODULE_NAME "axonram" | |
52 | #define AXON_RAM_DEVICE_NAME "axonram" | |
53 | #define AXON_RAM_MINORS_PER_DISK 16 | |
54 | #define AXON_RAM_BLOCK_SHIFT PAGE_SHIFT | |
55 | #define AXON_RAM_BLOCK_SIZE 1 << AXON_RAM_BLOCK_SHIFT | |
56 | #define AXON_RAM_SECTOR_SHIFT 9 | |
57 | #define AXON_RAM_SECTOR_SIZE 1 << AXON_RAM_SECTOR_SHIFT | |
58 | #define AXON_RAM_IRQ_FLAGS IRQF_SHARED | IRQF_TRIGGER_RISING | |
59 | ||
9a23409b MS |
60 | static int azfs_major, azfs_minor; |
61 | ||
dbdf04c4 | 62 | struct axon_ram_bank { |
a454dc50 | 63 | struct platform_device *device; |
dbdf04c4 | 64 | struct gendisk *disk; |
fedcd2c5 | 65 | unsigned int irq_id; |
dbdf04c4 MS |
66 | unsigned long ph_addr; |
67 | unsigned long io_addr; | |
68 | unsigned long size; | |
69 | unsigned long ecc_counter; | |
70 | }; | |
71 | ||
72 | static ssize_t | |
73 | axon_ram_sysfs_ecc(struct device *dev, struct device_attribute *attr, char *buf) | |
74 | { | |
a454dc50 | 75 | struct platform_device *device = to_platform_device(dev); |
dbdf04c4 MS |
76 | struct axon_ram_bank *bank = device->dev.platform_data; |
77 | ||
78 | BUG_ON(!bank); | |
79 | ||
80 | return sprintf(buf, "%ld\n", bank->ecc_counter); | |
81 | } | |
82 | ||
83 | static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL); | |
84 | ||
85 | /** | |
86 | * axon_ram_irq_handler - interrupt handler for Axon RAM ECC | |
87 | * @irq: interrupt ID | |
88 | * @dev: pointer to of_device | |
89 | */ | |
90 | static irqreturn_t | |
91 | axon_ram_irq_handler(int irq, void *dev) | |
92 | { | |
a454dc50 | 93 | struct platform_device *device = dev; |
dbdf04c4 MS |
94 | struct axon_ram_bank *bank = device->dev.platform_data; |
95 | ||
96 | BUG_ON(!bank); | |
97 | ||
fedcd2c5 MS |
98 | dev_err(&device->dev, "Correctable memory error occured\n"); |
99 | bank->ecc_counter++; | |
100 | return IRQ_HANDLED; | |
dbdf04c4 MS |
101 | } |
102 | ||
103 | /** | |
104 | * axon_ram_make_request - make_request() method for block device | |
105 | * @queue, @bio: see blk_queue_make_request() | |
106 | */ | |
107 | static int | |
108 | axon_ram_make_request(struct request_queue *queue, struct bio *bio) | |
109 | { | |
110 | struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data; | |
111 | unsigned long phys_mem, phys_end; | |
112 | void *user_mem; | |
113 | struct bio_vec *vec; | |
114 | unsigned int transfered; | |
115 | unsigned short idx; | |
116 | int rc = 0; | |
117 | ||
118 | phys_mem = bank->io_addr + (bio->bi_sector << AXON_RAM_SECTOR_SHIFT); | |
119 | phys_end = bank->io_addr + bank->size; | |
120 | transfered = 0; | |
121 | bio_for_each_segment(vec, bio, idx) { | |
122 | if (unlikely(phys_mem + vec->bv_len > phys_end)) { | |
d81fec0f | 123 | bio_io_error(bio); |
dbdf04c4 MS |
124 | rc = -ERANGE; |
125 | break; | |
126 | } | |
127 | ||
128 | user_mem = page_address(vec->bv_page) + vec->bv_offset; | |
129 | if (bio_data_dir(bio) == READ) | |
130 | memcpy(user_mem, (void *) phys_mem, vec->bv_len); | |
131 | else | |
132 | memcpy((void *) phys_mem, user_mem, vec->bv_len); | |
133 | ||
134 | phys_mem += vec->bv_len; | |
135 | transfered += vec->bv_len; | |
136 | } | |
d81fec0f | 137 | bio_endio(bio, 0); |
dbdf04c4 MS |
138 | |
139 | return rc; | |
140 | } | |
141 | ||
142 | /** | |
143 | * axon_ram_direct_access - direct_access() method for block device | |
144 | * @device, @sector, @data: see block_device_operations method | |
145 | */ | |
146 | static int | |
147 | axon_ram_direct_access(struct block_device *device, sector_t sector, | |
30afcb4b | 148 | void **kaddr, unsigned long *pfn) |
dbdf04c4 MS |
149 | { |
150 | struct axon_ram_bank *bank = device->bd_disk->private_data; | |
151 | loff_t offset; | |
152 | ||
8204cba7 MS |
153 | offset = sector; |
154 | if (device->bd_part != NULL) | |
155 | offset += device->bd_part->start_sect; | |
156 | offset <<= AXON_RAM_SECTOR_SHIFT; | |
dbdf04c4 MS |
157 | if (offset >= bank->size) { |
158 | dev_err(&bank->device->dev, "Access outside of address space\n"); | |
159 | return -ERANGE; | |
160 | } | |
161 | ||
30afcb4b JH |
162 | *kaddr = (void *)(bank->ph_addr + offset); |
163 | *pfn = virt_to_phys(kaddr) >> PAGE_SHIFT; | |
dbdf04c4 MS |
164 | |
165 | return 0; | |
166 | } | |
167 | ||
83d5cde4 | 168 | static const struct block_device_operations axon_ram_devops = { |
dbdf04c4 MS |
169 | .owner = THIS_MODULE, |
170 | .direct_access = axon_ram_direct_access | |
171 | }; | |
172 | ||
173 | /** | |
174 | * axon_ram_probe - probe() method for platform driver | |
175 | * @device, @device_id: see of_platform_driver method | |
176 | */ | |
a454dc50 GL |
177 | static int axon_ram_probe(struct platform_device *device, |
178 | const struct of_device_id *device_id) | |
dbdf04c4 MS |
179 | { |
180 | static int axon_ram_bank_id = -1; | |
181 | struct axon_ram_bank *bank; | |
182 | struct resource resource; | |
183 | int rc = 0; | |
184 | ||
185 | axon_ram_bank_id++; | |
186 | ||
187 | dev_info(&device->dev, "Found memory controller on %s\n", | |
61c7a080 | 188 | device->dev.of_node->full_name); |
dbdf04c4 MS |
189 | |
190 | bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL); | |
191 | if (bank == NULL) { | |
192 | dev_err(&device->dev, "Out of memory\n"); | |
193 | rc = -ENOMEM; | |
194 | goto failed; | |
195 | } | |
196 | ||
197 | device->dev.platform_data = bank; | |
198 | ||
199 | bank->device = device; | |
200 | ||
61c7a080 | 201 | if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) { |
dbdf04c4 MS |
202 | dev_err(&device->dev, "Cannot access device tree\n"); |
203 | rc = -EFAULT; | |
204 | goto failed; | |
205 | } | |
206 | ||
207 | bank->size = resource.end - resource.start + 1; | |
208 | ||
209 | if (bank->size == 0) { | |
210 | dev_err(&device->dev, "No DDR2 memory found for %s%d\n", | |
211 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id); | |
212 | rc = -ENODEV; | |
213 | goto failed; | |
214 | } | |
215 | ||
216 | dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n", | |
217 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20); | |
218 | ||
219 | bank->ph_addr = resource.start; | |
220 | bank->io_addr = (unsigned long) ioremap_flags( | |
221 | bank->ph_addr, bank->size, _PAGE_NO_CACHE); | |
222 | if (bank->io_addr == 0) { | |
223 | dev_err(&device->dev, "ioremap() failed\n"); | |
224 | rc = -EFAULT; | |
225 | goto failed; | |
226 | } | |
227 | ||
228 | bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK); | |
229 | if (bank->disk == NULL) { | |
230 | dev_err(&device->dev, "Cannot register disk\n"); | |
231 | rc = -EFAULT; | |
232 | goto failed; | |
233 | } | |
234 | ||
9a23409b MS |
235 | bank->disk->major = azfs_major; |
236 | bank->disk->first_minor = azfs_minor; | |
dbdf04c4 MS |
237 | bank->disk->fops = &axon_ram_devops; |
238 | bank->disk->private_data = bank; | |
239 | bank->disk->driverfs_dev = &device->dev; | |
240 | ||
241 | sprintf(bank->disk->disk_name, "%s%d", | |
242 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id); | |
dbdf04c4 MS |
243 | |
244 | bank->disk->queue = blk_alloc_queue(GFP_KERNEL); | |
245 | if (bank->disk->queue == NULL) { | |
246 | dev_err(&device->dev, "Cannot register disk queue\n"); | |
247 | rc = -EFAULT; | |
248 | goto failed; | |
249 | } | |
250 | ||
251 | set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT); | |
252 | blk_queue_make_request(bank->disk->queue, axon_ram_make_request); | |
e1defc4f | 253 | blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE); |
dbdf04c4 MS |
254 | add_disk(bank->disk); |
255 | ||
61c7a080 | 256 | bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0); |
fedcd2c5 | 257 | if (bank->irq_id == NO_IRQ) { |
dbdf04c4 MS |
258 | dev_err(&device->dev, "Cannot access ECC interrupt ID\n"); |
259 | rc = -EFAULT; | |
260 | goto failed; | |
261 | } | |
262 | ||
fedcd2c5 | 263 | rc = request_irq(bank->irq_id, axon_ram_irq_handler, |
dbdf04c4 MS |
264 | AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device); |
265 | if (rc != 0) { | |
266 | dev_err(&device->dev, "Cannot register ECC interrupt handler\n"); | |
fedcd2c5 | 267 | bank->irq_id = NO_IRQ; |
dbdf04c4 MS |
268 | rc = -EFAULT; |
269 | goto failed; | |
270 | } | |
271 | ||
272 | rc = device_create_file(&device->dev, &dev_attr_ecc); | |
273 | if (rc != 0) { | |
274 | dev_err(&device->dev, "Cannot create sysfs file\n"); | |
275 | rc = -EFAULT; | |
276 | goto failed; | |
277 | } | |
278 | ||
9a23409b MS |
279 | azfs_minor += bank->disk->minors; |
280 | ||
dbdf04c4 MS |
281 | return 0; |
282 | ||
283 | failed: | |
284 | if (bank != NULL) { | |
fedcd2c5 MS |
285 | if (bank->irq_id != NO_IRQ) |
286 | free_irq(bank->irq_id, device); | |
dbdf04c4 | 287 | if (bank->disk != NULL) { |
dbdf04c4 MS |
288 | if (bank->disk->major > 0) |
289 | unregister_blkdev(bank->disk->major, | |
290 | bank->disk->disk_name); | |
291 | del_gendisk(bank->disk); | |
292 | } | |
293 | device->dev.platform_data = NULL; | |
294 | if (bank->io_addr != 0) | |
295 | iounmap((void __iomem *) bank->io_addr); | |
296 | kfree(bank); | |
297 | } | |
298 | ||
299 | return rc; | |
300 | } | |
301 | ||
302 | /** | |
303 | * axon_ram_remove - remove() method for platform driver | |
304 | * @device: see of_platform_driver method | |
305 | */ | |
306 | static int | |
a454dc50 | 307 | axon_ram_remove(struct platform_device *device) |
dbdf04c4 MS |
308 | { |
309 | struct axon_ram_bank *bank = device->dev.platform_data; | |
310 | ||
311 | BUG_ON(!bank || !bank->disk); | |
312 | ||
313 | device_remove_file(&device->dev, &dev_attr_ecc); | |
fedcd2c5 | 314 | free_irq(bank->irq_id, device); |
dbdf04c4 MS |
315 | del_gendisk(bank->disk); |
316 | iounmap((void __iomem *) bank->io_addr); | |
317 | kfree(bank); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static struct of_device_id axon_ram_device_id[] = { | |
323 | { | |
324 | .type = "dma-memory" | |
325 | }, | |
326 | {} | |
327 | }; | |
328 | ||
329 | static struct of_platform_driver axon_ram_driver = { | |
dbdf04c4 | 330 | .probe = axon_ram_probe, |
84dd4676 | 331 | .remove = axon_ram_remove, |
4018294b GL |
332 | .driver = { |
333 | .name = AXON_RAM_MODULE_NAME, | |
334 | .owner = THIS_MODULE, | |
335 | .of_match_table = axon_ram_device_id, | |
84dd4676 | 336 | }, |
dbdf04c4 MS |
337 | }; |
338 | ||
339 | /** | |
340 | * axon_ram_init | |
341 | */ | |
342 | static int __init | |
343 | axon_ram_init(void) | |
344 | { | |
9a23409b MS |
345 | azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME); |
346 | if (azfs_major < 0) { | |
347 | printk(KERN_ERR "%s cannot become block device major number\n", | |
348 | AXON_RAM_MODULE_NAME); | |
349 | return -EFAULT; | |
350 | } | |
351 | azfs_minor = 0; | |
352 | ||
dbdf04c4 MS |
353 | return of_register_platform_driver(&axon_ram_driver); |
354 | } | |
355 | ||
356 | /** | |
357 | * axon_ram_exit | |
358 | */ | |
359 | static void __exit | |
360 | axon_ram_exit(void) | |
361 | { | |
362 | of_unregister_platform_driver(&axon_ram_driver); | |
9a23409b | 363 | unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME); |
dbdf04c4 MS |
364 | } |
365 | ||
366 | module_init(axon_ram_init); | |
367 | module_exit(axon_ram_exit); | |
368 | ||
369 | MODULE_LICENSE("GPL"); | |
370 | MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>"); | |
371 | MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE"); |