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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> | |
dbdf04c4 MS |
28 | #include <linux/device.h> |
29 | #include <linux/errno.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/genhd.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/io.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/irq.h> | |
36 | #include <linux/irqreturn.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/mod_devicetable.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/string.h> | |
43 | #include <linux/types.h> | |
eb8f2763 JL |
44 | #include <linux/of_device.h> |
45 | #include <linux/of_platform.h> | |
34c0fd54 | 46 | #include <linux/pfn_t.h> |
eb8f2763 | 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 | ||
25985edc | 98 | dev_err(&device->dev, "Correctable memory error occurred\n"); |
fedcd2c5 MS |
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 | */ | |
dece1635 | 107 | static blk_qc_t |
dbdf04c4 MS |
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; | |
7988613b | 113 | struct bio_vec vec; |
dbdf04c4 | 114 | unsigned int transfered; |
7988613b | 115 | struct bvec_iter iter; |
dbdf04c4 | 116 | |
4f024f37 KO |
117 | phys_mem = bank->io_addr + (bio->bi_iter.bi_sector << |
118 | AXON_RAM_SECTOR_SHIFT); | |
dbdf04c4 MS |
119 | phys_end = bank->io_addr + bank->size; |
120 | transfered = 0; | |
7988613b KO |
121 | bio_for_each_segment(vec, bio, iter) { |
122 | if (unlikely(phys_mem + vec.bv_len > phys_end)) { | |
d81fec0f | 123 | bio_io_error(bio); |
dece1635 | 124 | return BLK_QC_T_NONE; |
dbdf04c4 MS |
125 | } |
126 | ||
7988613b | 127 | user_mem = page_address(vec.bv_page) + vec.bv_offset; |
dbdf04c4 | 128 | if (bio_data_dir(bio) == READ) |
7988613b | 129 | memcpy(user_mem, (void *) phys_mem, vec.bv_len); |
dbdf04c4 | 130 | else |
7988613b | 131 | memcpy((void *) phys_mem, user_mem, vec.bv_len); |
dbdf04c4 | 132 | |
7988613b KO |
133 | phys_mem += vec.bv_len; |
134 | transfered += vec.bv_len; | |
dbdf04c4 | 135 | } |
4246a0b6 | 136 | bio_endio(bio); |
dece1635 | 137 | return BLK_QC_T_NONE; |
dbdf04c4 MS |
138 | } |
139 | ||
140 | /** | |
141 | * axon_ram_direct_access - direct_access() method for block device | |
142 | * @device, @sector, @data: see block_device_operations method | |
143 | */ | |
dd22f551 | 144 | static long |
dbdf04c4 | 145 | axon_ram_direct_access(struct block_device *device, sector_t sector, |
34c0fd54 | 146 | void __pmem **kaddr, pfn_t *pfn) |
dbdf04c4 MS |
147 | { |
148 | struct axon_ram_bank *bank = device->bd_disk->private_data; | |
dd22f551 | 149 | loff_t offset = (loff_t)sector << AXON_RAM_SECTOR_SHIFT; |
dbdf04c4 | 150 | |
34c0fd54 DW |
151 | *kaddr = (void __pmem __force *) bank->io_addr + offset; |
152 | *pfn = phys_to_pfn_t(bank->ph_addr + offset, PFN_DEV); | |
dd22f551 | 153 | return bank->size - offset; |
dbdf04c4 MS |
154 | } |
155 | ||
83d5cde4 | 156 | static const struct block_device_operations axon_ram_devops = { |
dbdf04c4 MS |
157 | .owner = THIS_MODULE, |
158 | .direct_access = axon_ram_direct_access | |
159 | }; | |
160 | ||
161 | /** | |
162 | * axon_ram_probe - probe() method for platform driver | |
00006124 | 163 | * @device: see platform_driver method |
dbdf04c4 | 164 | */ |
00006124 | 165 | static int axon_ram_probe(struct platform_device *device) |
dbdf04c4 MS |
166 | { |
167 | static int axon_ram_bank_id = -1; | |
168 | struct axon_ram_bank *bank; | |
169 | struct resource resource; | |
170 | int rc = 0; | |
171 | ||
172 | axon_ram_bank_id++; | |
173 | ||
174 | dev_info(&device->dev, "Found memory controller on %s\n", | |
61c7a080 | 175 | device->dev.of_node->full_name); |
dbdf04c4 MS |
176 | |
177 | bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL); | |
178 | if (bank == NULL) { | |
179 | dev_err(&device->dev, "Out of memory\n"); | |
180 | rc = -ENOMEM; | |
181 | goto failed; | |
182 | } | |
183 | ||
184 | device->dev.platform_data = bank; | |
185 | ||
186 | bank->device = device; | |
187 | ||
61c7a080 | 188 | if (of_address_to_resource(device->dev.of_node, 0, &resource) != 0) { |
dbdf04c4 MS |
189 | dev_err(&device->dev, "Cannot access device tree\n"); |
190 | rc = -EFAULT; | |
191 | goto failed; | |
192 | } | |
193 | ||
28f65c11 | 194 | bank->size = resource_size(&resource); |
dbdf04c4 MS |
195 | |
196 | if (bank->size == 0) { | |
197 | dev_err(&device->dev, "No DDR2 memory found for %s%d\n", | |
198 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id); | |
199 | rc = -ENODEV; | |
200 | goto failed; | |
201 | } | |
202 | ||
203 | dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n", | |
204 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20); | |
205 | ||
206 | bank->ph_addr = resource.start; | |
40f1ce7f | 207 | bank->io_addr = (unsigned long) ioremap_prot( |
dbdf04c4 MS |
208 | bank->ph_addr, bank->size, _PAGE_NO_CACHE); |
209 | if (bank->io_addr == 0) { | |
210 | dev_err(&device->dev, "ioremap() failed\n"); | |
211 | rc = -EFAULT; | |
212 | goto failed; | |
213 | } | |
214 | ||
215 | bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK); | |
216 | if (bank->disk == NULL) { | |
217 | dev_err(&device->dev, "Cannot register disk\n"); | |
218 | rc = -EFAULT; | |
219 | goto failed; | |
220 | } | |
221 | ||
9a23409b MS |
222 | bank->disk->major = azfs_major; |
223 | bank->disk->first_minor = azfs_minor; | |
dbdf04c4 MS |
224 | bank->disk->fops = &axon_ram_devops; |
225 | bank->disk->private_data = bank; | |
226 | bank->disk->driverfs_dev = &device->dev; | |
227 | ||
228 | sprintf(bank->disk->disk_name, "%s%d", | |
229 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id); | |
dbdf04c4 MS |
230 | |
231 | bank->disk->queue = blk_alloc_queue(GFP_KERNEL); | |
232 | if (bank->disk->queue == NULL) { | |
233 | dev_err(&device->dev, "Cannot register disk queue\n"); | |
234 | rc = -EFAULT; | |
235 | goto failed; | |
236 | } | |
237 | ||
238 | set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT); | |
239 | blk_queue_make_request(bank->disk->queue, axon_ram_make_request); | |
e1defc4f | 240 | blk_queue_logical_block_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE); |
dbdf04c4 MS |
241 | add_disk(bank->disk); |
242 | ||
61c7a080 | 243 | bank->irq_id = irq_of_parse_and_map(device->dev.of_node, 0); |
fedcd2c5 | 244 | if (bank->irq_id == NO_IRQ) { |
dbdf04c4 MS |
245 | dev_err(&device->dev, "Cannot access ECC interrupt ID\n"); |
246 | rc = -EFAULT; | |
247 | goto failed; | |
248 | } | |
249 | ||
fedcd2c5 | 250 | rc = request_irq(bank->irq_id, axon_ram_irq_handler, |
dbdf04c4 MS |
251 | AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device); |
252 | if (rc != 0) { | |
253 | dev_err(&device->dev, "Cannot register ECC interrupt handler\n"); | |
fedcd2c5 | 254 | bank->irq_id = NO_IRQ; |
dbdf04c4 MS |
255 | rc = -EFAULT; |
256 | goto failed; | |
257 | } | |
258 | ||
259 | rc = device_create_file(&device->dev, &dev_attr_ecc); | |
260 | if (rc != 0) { | |
261 | dev_err(&device->dev, "Cannot create sysfs file\n"); | |
262 | rc = -EFAULT; | |
263 | goto failed; | |
264 | } | |
265 | ||
9a23409b MS |
266 | azfs_minor += bank->disk->minors; |
267 | ||
dbdf04c4 MS |
268 | return 0; |
269 | ||
270 | failed: | |
271 | if (bank != NULL) { | |
fedcd2c5 MS |
272 | if (bank->irq_id != NO_IRQ) |
273 | free_irq(bank->irq_id, device); | |
dbdf04c4 | 274 | if (bank->disk != NULL) { |
dbdf04c4 MS |
275 | if (bank->disk->major > 0) |
276 | unregister_blkdev(bank->disk->major, | |
277 | bank->disk->disk_name); | |
278 | del_gendisk(bank->disk); | |
279 | } | |
280 | device->dev.platform_data = NULL; | |
281 | if (bank->io_addr != 0) | |
282 | iounmap((void __iomem *) bank->io_addr); | |
283 | kfree(bank); | |
284 | } | |
285 | ||
286 | return rc; | |
287 | } | |
288 | ||
289 | /** | |
290 | * axon_ram_remove - remove() method for platform driver | |
291 | * @device: see of_platform_driver method | |
292 | */ | |
293 | static int | |
a454dc50 | 294 | axon_ram_remove(struct platform_device *device) |
dbdf04c4 MS |
295 | { |
296 | struct axon_ram_bank *bank = device->dev.platform_data; | |
297 | ||
298 | BUG_ON(!bank || !bank->disk); | |
299 | ||
300 | device_remove_file(&device->dev, &dev_attr_ecc); | |
fedcd2c5 | 301 | free_irq(bank->irq_id, device); |
dbdf04c4 MS |
302 | del_gendisk(bank->disk); |
303 | iounmap((void __iomem *) bank->io_addr); | |
304 | kfree(bank); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
ce6d73c9 | 309 | static const struct of_device_id axon_ram_device_id[] = { |
dbdf04c4 MS |
310 | { |
311 | .type = "dma-memory" | |
312 | }, | |
313 | {} | |
314 | }; | |
b4f81445 | 315 | MODULE_DEVICE_TABLE(of, axon_ram_device_id); |
dbdf04c4 | 316 | |
00006124 | 317 | static struct platform_driver axon_ram_driver = { |
dbdf04c4 | 318 | .probe = axon_ram_probe, |
84dd4676 | 319 | .remove = axon_ram_remove, |
4018294b GL |
320 | .driver = { |
321 | .name = AXON_RAM_MODULE_NAME, | |
4018294b | 322 | .of_match_table = axon_ram_device_id, |
84dd4676 | 323 | }, |
dbdf04c4 MS |
324 | }; |
325 | ||
326 | /** | |
327 | * axon_ram_init | |
328 | */ | |
329 | static int __init | |
330 | axon_ram_init(void) | |
331 | { | |
9a23409b MS |
332 | azfs_major = register_blkdev(azfs_major, AXON_RAM_DEVICE_NAME); |
333 | if (azfs_major < 0) { | |
334 | printk(KERN_ERR "%s cannot become block device major number\n", | |
335 | AXON_RAM_MODULE_NAME); | |
336 | return -EFAULT; | |
337 | } | |
338 | azfs_minor = 0; | |
339 | ||
00006124 | 340 | return platform_driver_register(&axon_ram_driver); |
dbdf04c4 MS |
341 | } |
342 | ||
343 | /** | |
344 | * axon_ram_exit | |
345 | */ | |
346 | static void __exit | |
347 | axon_ram_exit(void) | |
348 | { | |
00006124 | 349 | platform_driver_unregister(&axon_ram_driver); |
9a23409b | 350 | unregister_blkdev(azfs_major, AXON_RAM_DEVICE_NAME); |
dbdf04c4 MS |
351 | } |
352 | ||
353 | module_init(axon_ram_init); | |
354 | module_exit(axon_ram_exit); | |
355 | ||
356 | MODULE_LICENSE("GPL"); | |
357 | MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>"); | |
358 | MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE"); |