diff options
-rw-r--r-- | arch/powerpc/platforms/Kconfig | 10 | ||||
-rw-r--r-- | arch/powerpc/sysdev/Makefile | 1 | ||||
-rw-r--r-- | arch/powerpc/sysdev/axonram.c | 381 |
3 files changed, 392 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index 33545d352e92..932538a93c2b 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig | |||
@@ -272,4 +272,14 @@ config CPM2 | |||
272 | you wish to build a kernel for a machine with a CPM2 coprocessor | 272 | you wish to build a kernel for a machine with a CPM2 coprocessor |
273 | on it (826x, 827x, 8560). | 273 | on it (826x, 827x, 8560). |
274 | 274 | ||
275 | config AXON_RAM | ||
276 | tristate "Axon DDR2 memory device driver" | ||
277 | depends on PPC_IBM_CELL_BLADE | ||
278 | default m | ||
279 | help | ||
280 | It registers one block device per Axon's DDR2 memory bank found | ||
281 | on a system. Block devices are called axonram?, their major and | ||
282 | minor numbers are available in /proc/devices, /proc/partitions or | ||
283 | in /sys/block/axonram?/dev. | ||
284 | |||
275 | endmenu | 285 | endmenu |
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile index f65078c3d3b3..484eb4e0e9db 100644 --- a/arch/powerpc/sysdev/Makefile +++ b/arch/powerpc/sysdev/Makefile | |||
@@ -17,6 +17,7 @@ obj-$(CONFIG_QUICC_ENGINE) += qe_lib/ | |||
17 | mv64x60-$(CONFIG_PCI) += mv64x60_pci.o | 17 | mv64x60-$(CONFIG_PCI) += mv64x60_pci.o |
18 | obj-$(CONFIG_MV64X60) += $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o | 18 | obj-$(CONFIG_MV64X60) += $(mv64x60-y) mv64x60_pic.o mv64x60_dev.o |
19 | obj-$(CONFIG_RTC_DRV_CMOS) += rtc_cmos_setup.o | 19 | obj-$(CONFIG_RTC_DRV_CMOS) += rtc_cmos_setup.o |
20 | obj-$(CONFIG_AXON_RAM) += axonram.o | ||
20 | 21 | ||
21 | # contains only the suspend handler for time | 22 | # contains only the suspend handler for time |
22 | ifeq ($(CONFIG_RTC_CLASS),) | 23 | ifeq ($(CONFIG_RTC_CLASS),) |
diff --git a/arch/powerpc/sysdev/axonram.c b/arch/powerpc/sysdev/axonram.c new file mode 100644 index 000000000000..2326d5dc5752 --- /dev/null +++ b/arch/powerpc/sysdev/axonram.c | |||
@@ -0,0 +1,381 @@ | |||
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> | ||
45 | #include <asm/of_device.h> | ||
46 | #include <asm/of_platform.h> | ||
47 | #include <asm/page.h> | ||
48 | #include <asm/prom.h> | ||
49 | |||
50 | #define AXON_RAM_MODULE_NAME "axonram" | ||
51 | #define AXON_RAM_DEVICE_NAME "axonram" | ||
52 | #define AXON_RAM_MINORS_PER_DISK 16 | ||
53 | #define AXON_RAM_BLOCK_SHIFT PAGE_SHIFT | ||
54 | #define AXON_RAM_BLOCK_SIZE 1 << AXON_RAM_BLOCK_SHIFT | ||
55 | #define AXON_RAM_SECTOR_SHIFT 9 | ||
56 | #define AXON_RAM_SECTOR_SIZE 1 << AXON_RAM_SECTOR_SHIFT | ||
57 | #define AXON_RAM_IRQ_FLAGS IRQF_SHARED | IRQF_TRIGGER_RISING | ||
58 | |||
59 | struct axon_ram_bank { | ||
60 | struct of_device *device; | ||
61 | struct gendisk *disk; | ||
62 | unsigned int irq_correctable; | ||
63 | unsigned int irq_uncorrectable; | ||
64 | unsigned long ph_addr; | ||
65 | unsigned long io_addr; | ||
66 | unsigned long size; | ||
67 | unsigned long ecc_counter; | ||
68 | }; | ||
69 | |||
70 | static ssize_t | ||
71 | axon_ram_sysfs_ecc(struct device *dev, struct device_attribute *attr, char *buf) | ||
72 | { | ||
73 | struct of_device *device = to_of_device(dev); | ||
74 | struct axon_ram_bank *bank = device->dev.platform_data; | ||
75 | |||
76 | BUG_ON(!bank); | ||
77 | |||
78 | return sprintf(buf, "%ld\n", bank->ecc_counter); | ||
79 | } | ||
80 | |||
81 | static DEVICE_ATTR(ecc, S_IRUGO, axon_ram_sysfs_ecc, NULL); | ||
82 | |||
83 | /** | ||
84 | * axon_ram_irq_handler - interrupt handler for Axon RAM ECC | ||
85 | * @irq: interrupt ID | ||
86 | * @dev: pointer to of_device | ||
87 | */ | ||
88 | static irqreturn_t | ||
89 | axon_ram_irq_handler(int irq, void *dev) | ||
90 | { | ||
91 | struct of_device *device = dev; | ||
92 | struct axon_ram_bank *bank = device->dev.platform_data; | ||
93 | |||
94 | BUG_ON(!bank); | ||
95 | |||
96 | if (irq == bank->irq_correctable) { | ||
97 | dev_err(&device->dev, "Correctable memory error occured\n"); | ||
98 | bank->ecc_counter++; | ||
99 | return IRQ_HANDLED; | ||
100 | } else if (irq == bank->irq_uncorrectable) { | ||
101 | dev_err(&device->dev, "Uncorrectable memory error occured\n"); | ||
102 | panic("Critical ECC error on %s", device->node->full_name); | ||
103 | } | ||
104 | |||
105 | return IRQ_NONE; | ||
106 | } | ||
107 | |||
108 | /** | ||
109 | * axon_ram_make_request - make_request() method for block device | ||
110 | * @queue, @bio: see blk_queue_make_request() | ||
111 | */ | ||
112 | static int | ||
113 | axon_ram_make_request(struct request_queue *queue, struct bio *bio) | ||
114 | { | ||
115 | struct axon_ram_bank *bank = bio->bi_bdev->bd_disk->private_data; | ||
116 | unsigned long phys_mem, phys_end; | ||
117 | void *user_mem; | ||
118 | struct bio_vec *vec; | ||
119 | unsigned int transfered; | ||
120 | unsigned short idx; | ||
121 | int rc = 0; | ||
122 | |||
123 | phys_mem = bank->io_addr + (bio->bi_sector << AXON_RAM_SECTOR_SHIFT); | ||
124 | phys_end = bank->io_addr + bank->size; | ||
125 | transfered = 0; | ||
126 | bio_for_each_segment(vec, bio, idx) { | ||
127 | if (unlikely(phys_mem + vec->bv_len > phys_end)) { | ||
128 | bio_io_error(bio, bio->bi_size); | ||
129 | rc = -ERANGE; | ||
130 | break; | ||
131 | } | ||
132 | |||
133 | user_mem = page_address(vec->bv_page) + vec->bv_offset; | ||
134 | if (bio_data_dir(bio) == READ) | ||
135 | memcpy(user_mem, (void *) phys_mem, vec->bv_len); | ||
136 | else | ||
137 | memcpy((void *) phys_mem, user_mem, vec->bv_len); | ||
138 | |||
139 | phys_mem += vec->bv_len; | ||
140 | transfered += vec->bv_len; | ||
141 | } | ||
142 | bio_endio(bio, transfered, 0); | ||
143 | |||
144 | return rc; | ||
145 | } | ||
146 | |||
147 | /** | ||
148 | * axon_ram_direct_access - direct_access() method for block device | ||
149 | * @device, @sector, @data: see block_device_operations method | ||
150 | */ | ||
151 | static int | ||
152 | axon_ram_direct_access(struct block_device *device, sector_t sector, | ||
153 | unsigned long *data) | ||
154 | { | ||
155 | struct axon_ram_bank *bank = device->bd_disk->private_data; | ||
156 | loff_t offset; | ||
157 | |||
158 | offset = sector << AXON_RAM_SECTOR_SHIFT; | ||
159 | if (offset >= bank->size) { | ||
160 | dev_err(&bank->device->dev, "Access outside of address space\n"); | ||
161 | return -ERANGE; | ||
162 | } | ||
163 | |||
164 | *data = bank->ph_addr + offset; | ||
165 | |||
166 | return 0; | ||
167 | } | ||
168 | |||
169 | static struct block_device_operations axon_ram_devops = { | ||
170 | .owner = THIS_MODULE, | ||
171 | .direct_access = axon_ram_direct_access | ||
172 | }; | ||
173 | |||
174 | /** | ||
175 | * axon_ram_probe - probe() method for platform driver | ||
176 | * @device, @device_id: see of_platform_driver method | ||
177 | */ | ||
178 | static int | ||
179 | axon_ram_probe(struct of_device *device, const struct of_device_id *device_id) | ||
180 | { | ||
181 | static int axon_ram_bank_id = -1; | ||
182 | struct axon_ram_bank *bank; | ||
183 | struct resource resource; | ||
184 | int rc = 0; | ||
185 | |||
186 | axon_ram_bank_id++; | ||
187 | |||
188 | dev_info(&device->dev, "Found memory controller on %s\n", | ||
189 | device->node->full_name); | ||
190 | |||
191 | bank = kzalloc(sizeof(struct axon_ram_bank), GFP_KERNEL); | ||
192 | if (bank == NULL) { | ||
193 | dev_err(&device->dev, "Out of memory\n"); | ||
194 | rc = -ENOMEM; | ||
195 | goto failed; | ||
196 | } | ||
197 | |||
198 | device->dev.platform_data = bank; | ||
199 | |||
200 | bank->device = device; | ||
201 | |||
202 | if (of_address_to_resource(device->node, 0, &resource) != 0) { | ||
203 | dev_err(&device->dev, "Cannot access device tree\n"); | ||
204 | rc = -EFAULT; | ||
205 | goto failed; | ||
206 | } | ||
207 | |||
208 | bank->size = resource.end - resource.start + 1; | ||
209 | |||
210 | if (bank->size == 0) { | ||
211 | dev_err(&device->dev, "No DDR2 memory found for %s%d\n", | ||
212 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id); | ||
213 | rc = -ENODEV; | ||
214 | goto failed; | ||
215 | } | ||
216 | |||
217 | dev_info(&device->dev, "Register DDR2 memory device %s%d with %luMB\n", | ||
218 | AXON_RAM_DEVICE_NAME, axon_ram_bank_id, bank->size >> 20); | ||
219 | |||
220 | bank->ph_addr = resource.start; | ||
221 | bank->io_addr = (unsigned long) ioremap_flags( | ||
222 | bank->ph_addr, bank->size, _PAGE_NO_CACHE); | ||
223 | if (bank->io_addr == 0) { | ||
224 | dev_err(&device->dev, "ioremap() failed\n"); | ||
225 | rc = -EFAULT; | ||
226 | goto failed; | ||
227 | } | ||
228 | |||
229 | bank->disk = alloc_disk(AXON_RAM_MINORS_PER_DISK); | ||
230 | if (bank->disk == NULL) { | ||
231 | dev_err(&device->dev, "Cannot register disk\n"); | ||
232 | rc = -EFAULT; | ||
233 | goto failed; | ||
234 | } | ||
235 | |||
236 | bank->disk->first_minor = 0; | ||
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); | ||
243 | bank->disk->major = register_blkdev(0, bank->disk->disk_name); | ||
244 | if (bank->disk->major < 0) { | ||
245 | dev_err(&device->dev, "Cannot register block device\n"); | ||
246 | rc = -EFAULT; | ||
247 | goto failed; | ||
248 | } | ||
249 | |||
250 | bank->disk->queue = blk_alloc_queue(GFP_KERNEL); | ||
251 | if (bank->disk->queue == NULL) { | ||
252 | dev_err(&device->dev, "Cannot register disk queue\n"); | ||
253 | rc = -EFAULT; | ||
254 | goto failed; | ||
255 | } | ||
256 | |||
257 | set_capacity(bank->disk, bank->size >> AXON_RAM_SECTOR_SHIFT); | ||
258 | blk_queue_make_request(bank->disk->queue, axon_ram_make_request); | ||
259 | blk_queue_hardsect_size(bank->disk->queue, AXON_RAM_SECTOR_SIZE); | ||
260 | add_disk(bank->disk); | ||
261 | |||
262 | bank->irq_correctable = irq_of_parse_and_map(device->node, 0); | ||
263 | bank->irq_uncorrectable = irq_of_parse_and_map(device->node, 1); | ||
264 | if ((bank->irq_correctable <= 0) || (bank->irq_uncorrectable <= 0)) { | ||
265 | dev_err(&device->dev, "Cannot access ECC interrupt ID\n"); | ||
266 | rc = -EFAULT; | ||
267 | goto failed; | ||
268 | } | ||
269 | |||
270 | rc = request_irq(bank->irq_correctable, axon_ram_irq_handler, | ||
271 | AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device); | ||
272 | if (rc != 0) { | ||
273 | dev_err(&device->dev, "Cannot register ECC interrupt handler\n"); | ||
274 | bank->irq_correctable = bank->irq_uncorrectable = 0; | ||
275 | rc = -EFAULT; | ||
276 | goto failed; | ||
277 | } | ||
278 | |||
279 | rc = request_irq(bank->irq_uncorrectable, axon_ram_irq_handler, | ||
280 | AXON_RAM_IRQ_FLAGS, bank->disk->disk_name, device); | ||
281 | if (rc != 0) { | ||
282 | dev_err(&device->dev, "Cannot register ECC interrupt handler\n"); | ||
283 | bank->irq_uncorrectable = 0; | ||
284 | rc = -EFAULT; | ||
285 | goto failed; | ||
286 | } | ||
287 | |||
288 | rc = device_create_file(&device->dev, &dev_attr_ecc); | ||
289 | if (rc != 0) { | ||
290 | dev_err(&device->dev, "Cannot create sysfs file\n"); | ||
291 | rc = -EFAULT; | ||
292 | goto failed; | ||
293 | } | ||
294 | |||
295 | return 0; | ||
296 | |||
297 | failed: | ||
298 | if (bank != NULL) { | ||
299 | if (bank->irq_uncorrectable > 0) | ||
300 | free_irq(bank->irq_uncorrectable, device); | ||
301 | if (bank->irq_correctable > 0) | ||
302 | free_irq(bank->irq_correctable, device); | ||
303 | if (bank->disk != NULL) { | ||
304 | if (bank->disk->queue != NULL) | ||
305 | blk_cleanup_queue(bank->disk->queue); | ||
306 | if (bank->disk->major > 0) | ||
307 | unregister_blkdev(bank->disk->major, | ||
308 | bank->disk->disk_name); | ||
309 | del_gendisk(bank->disk); | ||
310 | } | ||
311 | device->dev.platform_data = NULL; | ||
312 | if (bank->io_addr != 0) | ||
313 | iounmap((void __iomem *) bank->io_addr); | ||
314 | kfree(bank); | ||
315 | } | ||
316 | |||
317 | return rc; | ||
318 | } | ||
319 | |||
320 | /** | ||
321 | * axon_ram_remove - remove() method for platform driver | ||
322 | * @device: see of_platform_driver method | ||
323 | */ | ||
324 | static int | ||
325 | axon_ram_remove(struct of_device *device) | ||
326 | { | ||
327 | struct axon_ram_bank *bank = device->dev.platform_data; | ||
328 | |||
329 | BUG_ON(!bank || !bank->disk); | ||
330 | |||
331 | device_remove_file(&device->dev, &dev_attr_ecc); | ||
332 | free_irq(bank->irq_uncorrectable, device); | ||
333 | free_irq(bank->irq_correctable, device); | ||
334 | blk_cleanup_queue(bank->disk->queue); | ||
335 | unregister_blkdev(bank->disk->major, bank->disk->disk_name); | ||
336 | del_gendisk(bank->disk); | ||
337 | iounmap((void __iomem *) bank->io_addr); | ||
338 | kfree(bank); | ||
339 | |||
340 | return 0; | ||
341 | } | ||
342 | |||
343 | static struct of_device_id axon_ram_device_id[] = { | ||
344 | { | ||
345 | .type = "dma-memory" | ||
346 | }, | ||
347 | {} | ||
348 | }; | ||
349 | |||
350 | static struct of_platform_driver axon_ram_driver = { | ||
351 | .owner = THIS_MODULE, | ||
352 | .name = AXON_RAM_MODULE_NAME, | ||
353 | .match_table = axon_ram_device_id, | ||
354 | .probe = axon_ram_probe, | ||
355 | .remove = axon_ram_remove | ||
356 | }; | ||
357 | |||
358 | /** | ||
359 | * axon_ram_init | ||
360 | */ | ||
361 | static int __init | ||
362 | axon_ram_init(void) | ||
363 | { | ||
364 | return of_register_platform_driver(&axon_ram_driver); | ||
365 | } | ||
366 | |||
367 | /** | ||
368 | * axon_ram_exit | ||
369 | */ | ||
370 | static void __exit | ||
371 | axon_ram_exit(void) | ||
372 | { | ||
373 | of_unregister_platform_driver(&axon_ram_driver); | ||
374 | } | ||
375 | |||
376 | module_init(axon_ram_init); | ||
377 | module_exit(axon_ram_exit); | ||
378 | |||
379 | MODULE_LICENSE("GPL"); | ||
380 | MODULE_AUTHOR("Maxim Shchetynin <maxim@de.ibm.com>"); | ||
381 | MODULE_DESCRIPTION("Axon DDR2 RAM device driver for IBM Cell BE"); | ||