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bf224335 PA |
1 | /* |
2 | * Error Location Module | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | */ | |
17 | ||
c7ea95a3 PG |
18 | #define DRIVER_NAME "omap-elm" |
19 | ||
bf224335 PA |
20 | #include <linux/platform_device.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/io.h> | |
24 | #include <linux/of.h> | |
11f164d1 | 25 | #include <linux/sched.h> |
bf224335 PA |
26 | #include <linux/pm_runtime.h> |
27 | #include <linux/platform_data/elm.h> | |
28 | ||
11f164d1 | 29 | #define ELM_SYSCONFIG 0x010 |
bf224335 PA |
30 | #define ELM_IRQSTATUS 0x018 |
31 | #define ELM_IRQENABLE 0x01c | |
32 | #define ELM_LOCATION_CONFIG 0x020 | |
33 | #define ELM_PAGE_CTRL 0x080 | |
34 | #define ELM_SYNDROME_FRAGMENT_0 0x400 | |
11f164d1 | 35 | #define ELM_SYNDROME_FRAGMENT_1 0x404 |
36 | #define ELM_SYNDROME_FRAGMENT_2 0x408 | |
37 | #define ELM_SYNDROME_FRAGMENT_3 0x40c | |
38 | #define ELM_SYNDROME_FRAGMENT_4 0x410 | |
39 | #define ELM_SYNDROME_FRAGMENT_5 0x414 | |
bf224335 PA |
40 | #define ELM_SYNDROME_FRAGMENT_6 0x418 |
41 | #define ELM_LOCATION_STATUS 0x800 | |
42 | #define ELM_ERROR_LOCATION_0 0x880 | |
43 | ||
44 | /* ELM Interrupt Status Register */ | |
45 | #define INTR_STATUS_PAGE_VALID BIT(8) | |
46 | ||
47 | /* ELM Interrupt Enable Register */ | |
48 | #define INTR_EN_PAGE_MASK BIT(8) | |
49 | ||
50 | /* ELM Location Configuration Register */ | |
51 | #define ECC_BCH_LEVEL_MASK 0x3 | |
52 | ||
53 | /* ELM syndrome */ | |
54 | #define ELM_SYNDROME_VALID BIT(16) | |
55 | ||
56 | /* ELM_LOCATION_STATUS Register */ | |
57 | #define ECC_CORRECTABLE_MASK BIT(8) | |
58 | #define ECC_NB_ERRORS_MASK 0x1f | |
59 | ||
60 | /* ELM_ERROR_LOCATION_0-15 Registers */ | |
61 | #define ECC_ERROR_LOCATION_MASK 0x1fff | |
62 | ||
63 | #define ELM_ECC_SIZE 0x7ff | |
64 | ||
65 | #define SYNDROME_FRAGMENT_REG_SIZE 0x40 | |
66 | #define ERROR_LOCATION_SIZE 0x100 | |
67 | ||
11f164d1 | 68 | struct elm_registers { |
69 | u32 elm_irqenable; | |
70 | u32 elm_sysconfig; | |
71 | u32 elm_location_config; | |
72 | u32 elm_page_ctrl; | |
73 | u32 elm_syndrome_fragment_6[ERROR_VECTOR_MAX]; | |
74 | u32 elm_syndrome_fragment_5[ERROR_VECTOR_MAX]; | |
75 | u32 elm_syndrome_fragment_4[ERROR_VECTOR_MAX]; | |
76 | u32 elm_syndrome_fragment_3[ERROR_VECTOR_MAX]; | |
77 | u32 elm_syndrome_fragment_2[ERROR_VECTOR_MAX]; | |
78 | u32 elm_syndrome_fragment_1[ERROR_VECTOR_MAX]; | |
79 | u32 elm_syndrome_fragment_0[ERROR_VECTOR_MAX]; | |
80 | }; | |
81 | ||
bf224335 PA |
82 | struct elm_info { |
83 | struct device *dev; | |
84 | void __iomem *elm_base; | |
85 | struct completion elm_completion; | |
86 | struct list_head list; | |
87 | enum bch_ecc bch_type; | |
11f164d1 | 88 | struct elm_registers elm_regs; |
79f01351 | 89 | int ecc_steps; |
ea076024 | 90 | int ecc_syndrome_size; |
bf224335 PA |
91 | }; |
92 | ||
93 | static LIST_HEAD(elm_devices); | |
94 | ||
95 | static void elm_write_reg(struct elm_info *info, int offset, u32 val) | |
96 | { | |
97 | writel(val, info->elm_base + offset); | |
98 | } | |
99 | ||
100 | static u32 elm_read_reg(struct elm_info *info, int offset) | |
101 | { | |
102 | return readl(info->elm_base + offset); | |
103 | } | |
104 | ||
105 | /** | |
106 | * elm_config - Configure ELM module | |
107 | * @dev: ELM device | |
108 | * @bch_type: Type of BCH ecc | |
109 | */ | |
3f4eb14b PG |
110 | int elm_config(struct device *dev, enum bch_ecc bch_type, |
111 | int ecc_steps, int ecc_step_size, int ecc_syndrome_size) | |
bf224335 PA |
112 | { |
113 | u32 reg_val; | |
114 | struct elm_info *info = dev_get_drvdata(dev); | |
115 | ||
ad245789 DM |
116 | if (!info) { |
117 | dev_err(dev, "Unable to configure elm - device not probed?\n"); | |
0c53b4e7 | 118 | return -EPROBE_DEFER; |
ad245789 | 119 | } |
3f4eb14b PG |
120 | /* ELM cannot detect ECC errors for chunks > 1KB */ |
121 | if (ecc_step_size > ((ELM_ECC_SIZE + 1) / 2)) { | |
122 | dev_err(dev, "unsupported config ecc-size=%d\n", ecc_step_size); | |
123 | return -EINVAL; | |
124 | } | |
125 | /* ELM support 8 error syndrome process */ | |
126 | if (ecc_steps > ERROR_VECTOR_MAX) { | |
127 | dev_err(dev, "unsupported config ecc-step=%d\n", ecc_steps); | |
128 | return -EINVAL; | |
129 | } | |
ad245789 | 130 | |
bf224335 PA |
131 | reg_val = (bch_type & ECC_BCH_LEVEL_MASK) | (ELM_ECC_SIZE << 16); |
132 | elm_write_reg(info, ELM_LOCATION_CONFIG, reg_val); | |
ea076024 | 133 | info->bch_type = bch_type; |
79f01351 | 134 | info->ecc_steps = ecc_steps; |
ea076024 | 135 | info->ecc_syndrome_size = ecc_syndrome_size; |
ad245789 DM |
136 | |
137 | return 0; | |
bf224335 PA |
138 | } |
139 | EXPORT_SYMBOL(elm_config); | |
140 | ||
141 | /** | |
142 | * elm_configure_page_mode - Enable/Disable page mode | |
143 | * @info: elm info | |
144 | * @index: index number of syndrome fragment vector | |
145 | * @enable: enable/disable flag for page mode | |
146 | * | |
147 | * Enable page mode for syndrome fragment index | |
148 | */ | |
149 | static void elm_configure_page_mode(struct elm_info *info, int index, | |
150 | bool enable) | |
151 | { | |
152 | u32 reg_val; | |
153 | ||
154 | reg_val = elm_read_reg(info, ELM_PAGE_CTRL); | |
155 | if (enable) | |
156 | reg_val |= BIT(index); /* enable page mode */ | |
157 | else | |
158 | reg_val &= ~BIT(index); /* disable page mode */ | |
159 | ||
160 | elm_write_reg(info, ELM_PAGE_CTRL, reg_val); | |
161 | } | |
162 | ||
163 | /** | |
164 | * elm_load_syndrome - Load ELM syndrome reg | |
165 | * @info: elm info | |
166 | * @err_vec: elm error vectors | |
167 | * @ecc: buffer with calculated ecc | |
168 | * | |
169 | * Load syndrome fragment registers with calculated ecc in reverse order. | |
170 | */ | |
171 | static void elm_load_syndrome(struct elm_info *info, | |
172 | struct elm_errorvec *err_vec, u8 *ecc) | |
173 | { | |
174 | int i, offset; | |
175 | u32 val; | |
176 | ||
79f01351 | 177 | for (i = 0; i < info->ecc_steps; i++) { |
bf224335 PA |
178 | |
179 | /* Check error reported */ | |
180 | if (err_vec[i].error_reported) { | |
181 | elm_configure_page_mode(info, i, true); | |
182 | offset = ELM_SYNDROME_FRAGMENT_0 + | |
183 | SYNDROME_FRAGMENT_REG_SIZE * i; | |
ea076024 PG |
184 | switch (info->bch_type) { |
185 | case BCH8_ECC: | |
bf224335 PA |
186 | /* syndrome fragment 0 = ecc[9-12B] */ |
187 | val = cpu_to_be32(*(u32 *) &ecc[9]); | |
188 | elm_write_reg(info, offset, val); | |
189 | ||
190 | /* syndrome fragment 1 = ecc[5-8B] */ | |
191 | offset += 4; | |
192 | val = cpu_to_be32(*(u32 *) &ecc[5]); | |
193 | elm_write_reg(info, offset, val); | |
194 | ||
195 | /* syndrome fragment 2 = ecc[1-4B] */ | |
196 | offset += 4; | |
197 | val = cpu_to_be32(*(u32 *) &ecc[1]); | |
198 | elm_write_reg(info, offset, val); | |
199 | ||
200 | /* syndrome fragment 3 = ecc[0B] */ | |
201 | offset += 4; | |
202 | val = ecc[0]; | |
203 | elm_write_reg(info, offset, val); | |
ea076024 PG |
204 | break; |
205 | case BCH4_ECC: | |
bf224335 PA |
206 | /* syndrome fragment 0 = ecc[20-52b] bits */ |
207 | val = (cpu_to_be32(*(u32 *) &ecc[3]) >> 4) | | |
208 | ((ecc[2] & 0xf) << 28); | |
209 | elm_write_reg(info, offset, val); | |
210 | ||
211 | /* syndrome fragment 1 = ecc[0-20b] bits */ | |
212 | offset += 4; | |
213 | val = cpu_to_be32(*(u32 *) &ecc[0]) >> 12; | |
214 | elm_write_reg(info, offset, val); | |
ea076024 | 215 | break; |
2be589e4 | 216 | case BCH16_ECC: |
217 | val = cpu_to_be32(*(u32 *) &ecc[22]); | |
218 | elm_write_reg(info, offset, val); | |
219 | offset += 4; | |
220 | val = cpu_to_be32(*(u32 *) &ecc[18]); | |
221 | elm_write_reg(info, offset, val); | |
222 | offset += 4; | |
223 | val = cpu_to_be32(*(u32 *) &ecc[14]); | |
224 | elm_write_reg(info, offset, val); | |
225 | offset += 4; | |
226 | val = cpu_to_be32(*(u32 *) &ecc[10]); | |
227 | elm_write_reg(info, offset, val); | |
228 | offset += 4; | |
229 | val = cpu_to_be32(*(u32 *) &ecc[6]); | |
230 | elm_write_reg(info, offset, val); | |
231 | offset += 4; | |
232 | val = cpu_to_be32(*(u32 *) &ecc[2]); | |
233 | elm_write_reg(info, offset, val); | |
234 | offset += 4; | |
235 | val = cpu_to_be32(*(u32 *) &ecc[0]) >> 16; | |
236 | elm_write_reg(info, offset, val); | |
237 | break; | |
ea076024 PG |
238 | default: |
239 | pr_err("invalid config bch_type\n"); | |
bf224335 PA |
240 | } |
241 | } | |
242 | ||
243 | /* Update ecc pointer with ecc byte size */ | |
ea076024 | 244 | ecc += info->ecc_syndrome_size; |
bf224335 PA |
245 | } |
246 | } | |
247 | ||
248 | /** | |
249 | * elm_start_processing - start elm syndrome processing | |
250 | * @info: elm info | |
251 | * @err_vec: elm error vectors | |
252 | * | |
253 | * Set syndrome valid bit for syndrome fragment registers for which | |
254 | * elm syndrome fragment registers are loaded. This enables elm module | |
255 | * to start processing syndrome vectors. | |
256 | */ | |
257 | static void elm_start_processing(struct elm_info *info, | |
258 | struct elm_errorvec *err_vec) | |
259 | { | |
260 | int i, offset; | |
261 | u32 reg_val; | |
262 | ||
263 | /* | |
264 | * Set syndrome vector valid, so that ELM module | |
265 | * will process it for vectors error is reported | |
266 | */ | |
79f01351 | 267 | for (i = 0; i < info->ecc_steps; i++) { |
bf224335 PA |
268 | if (err_vec[i].error_reported) { |
269 | offset = ELM_SYNDROME_FRAGMENT_6 + | |
270 | SYNDROME_FRAGMENT_REG_SIZE * i; | |
271 | reg_val = elm_read_reg(info, offset); | |
272 | reg_val |= ELM_SYNDROME_VALID; | |
273 | elm_write_reg(info, offset, reg_val); | |
274 | } | |
275 | } | |
276 | } | |
277 | ||
278 | /** | |
279 | * elm_error_correction - locate correctable error position | |
280 | * @info: elm info | |
281 | * @err_vec: elm error vectors | |
282 | * | |
283 | * On completion of processing by elm module, error location status | |
284 | * register updated with correctable/uncorrectable error information. | |
285 | * In case of correctable errors, number of errors located from | |
286 | * elm location status register & read the positions from | |
287 | * elm error location register. | |
288 | */ | |
289 | static void elm_error_correction(struct elm_info *info, | |
290 | struct elm_errorvec *err_vec) | |
291 | { | |
292 | int i, j, errors = 0; | |
293 | int offset; | |
294 | u32 reg_val; | |
295 | ||
79f01351 | 296 | for (i = 0; i < info->ecc_steps; i++) { |
bf224335 PA |
297 | |
298 | /* Check error reported */ | |
299 | if (err_vec[i].error_reported) { | |
300 | offset = ELM_LOCATION_STATUS + ERROR_LOCATION_SIZE * i; | |
301 | reg_val = elm_read_reg(info, offset); | |
302 | ||
303 | /* Check correctable error or not */ | |
304 | if (reg_val & ECC_CORRECTABLE_MASK) { | |
305 | offset = ELM_ERROR_LOCATION_0 + | |
306 | ERROR_LOCATION_SIZE * i; | |
307 | ||
308 | /* Read count of correctable errors */ | |
309 | err_vec[i].error_count = reg_val & | |
310 | ECC_NB_ERRORS_MASK; | |
311 | ||
312 | /* Update the error locations in error vector */ | |
313 | for (j = 0; j < err_vec[i].error_count; j++) { | |
314 | ||
315 | reg_val = elm_read_reg(info, offset); | |
316 | err_vec[i].error_loc[j] = reg_val & | |
317 | ECC_ERROR_LOCATION_MASK; | |
318 | ||
319 | /* Update error location register */ | |
320 | offset += 4; | |
321 | } | |
322 | ||
323 | errors += err_vec[i].error_count; | |
324 | } else { | |
325 | err_vec[i].error_uncorrectable = true; | |
326 | } | |
327 | ||
328 | /* Clearing interrupts for processed error vectors */ | |
329 | elm_write_reg(info, ELM_IRQSTATUS, BIT(i)); | |
330 | ||
331 | /* Disable page mode */ | |
332 | elm_configure_page_mode(info, i, false); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | /** | |
338 | * elm_decode_bch_error_page - Locate error position | |
339 | * @dev: device pointer | |
340 | * @ecc_calc: calculated ECC bytes from GPMC | |
341 | * @err_vec: elm error vectors | |
342 | * | |
343 | * Called with one or more error reported vectors & vectors with | |
344 | * error reported is updated in err_vec[].error_reported | |
345 | */ | |
346 | void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc, | |
347 | struct elm_errorvec *err_vec) | |
348 | { | |
349 | struct elm_info *info = dev_get_drvdata(dev); | |
350 | u32 reg_val; | |
351 | ||
352 | /* Enable page mode interrupt */ | |
353 | reg_val = elm_read_reg(info, ELM_IRQSTATUS); | |
354 | elm_write_reg(info, ELM_IRQSTATUS, reg_val & INTR_STATUS_PAGE_VALID); | |
355 | elm_write_reg(info, ELM_IRQENABLE, INTR_EN_PAGE_MASK); | |
356 | ||
357 | /* Load valid ecc byte to syndrome fragment register */ | |
358 | elm_load_syndrome(info, err_vec, ecc_calc); | |
359 | ||
360 | /* Enable syndrome processing for which syndrome fragment is updated */ | |
361 | elm_start_processing(info, err_vec); | |
362 | ||
363 | /* Wait for ELM module to finish locating error correction */ | |
364 | wait_for_completion(&info->elm_completion); | |
365 | ||
366 | /* Disable page mode interrupt */ | |
367 | reg_val = elm_read_reg(info, ELM_IRQENABLE); | |
368 | elm_write_reg(info, ELM_IRQENABLE, reg_val & ~INTR_EN_PAGE_MASK); | |
369 | elm_error_correction(info, err_vec); | |
370 | } | |
371 | EXPORT_SYMBOL(elm_decode_bch_error_page); | |
372 | ||
373 | static irqreturn_t elm_isr(int this_irq, void *dev_id) | |
374 | { | |
375 | u32 reg_val; | |
376 | struct elm_info *info = dev_id; | |
377 | ||
378 | reg_val = elm_read_reg(info, ELM_IRQSTATUS); | |
379 | ||
380 | /* All error vectors processed */ | |
381 | if (reg_val & INTR_STATUS_PAGE_VALID) { | |
382 | elm_write_reg(info, ELM_IRQSTATUS, | |
383 | reg_val & INTR_STATUS_PAGE_VALID); | |
384 | complete(&info->elm_completion); | |
385 | return IRQ_HANDLED; | |
386 | } | |
387 | ||
388 | return IRQ_NONE; | |
389 | } | |
390 | ||
391 | static int elm_probe(struct platform_device *pdev) | |
392 | { | |
393 | int ret = 0; | |
394 | struct resource *res, *irq; | |
395 | struct elm_info *info; | |
396 | ||
397 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
834fa8a5 | 398 | if (!info) |
bf224335 | 399 | return -ENOMEM; |
bf224335 PA |
400 | |
401 | info->dev = &pdev->dev; | |
402 | ||
403 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
404 | if (!irq) { | |
405 | dev_err(&pdev->dev, "no irq resource defined\n"); | |
406 | return -ENODEV; | |
407 | } | |
408 | ||
409 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
43579688 SMP |
410 | info->elm_base = devm_ioremap_resource(&pdev->dev, res); |
411 | if (IS_ERR(info->elm_base)) | |
412 | return PTR_ERR(info->elm_base); | |
bf224335 PA |
413 | |
414 | ret = devm_request_irq(&pdev->dev, irq->start, elm_isr, 0, | |
415 | pdev->name, info); | |
416 | if (ret) { | |
417 | dev_err(&pdev->dev, "failure requesting irq %i\n", irq->start); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | pm_runtime_enable(&pdev->dev); | |
0a21552a | 422 | if (pm_runtime_get_sync(&pdev->dev) < 0) { |
bf224335 PA |
423 | ret = -EINVAL; |
424 | pm_runtime_disable(&pdev->dev); | |
425 | dev_err(&pdev->dev, "can't enable clock\n"); | |
426 | return ret; | |
427 | } | |
428 | ||
429 | init_completion(&info->elm_completion); | |
430 | INIT_LIST_HEAD(&info->list); | |
431 | list_add(&info->list, &elm_devices); | |
432 | platform_set_drvdata(pdev, info); | |
433 | return ret; | |
434 | } | |
435 | ||
436 | static int elm_remove(struct platform_device *pdev) | |
437 | { | |
438 | pm_runtime_put_sync(&pdev->dev); | |
439 | pm_runtime_disable(&pdev->dev); | |
bf224335 PA |
440 | return 0; |
441 | } | |
442 | ||
8d808959 | 443 | #ifdef CONFIG_PM_SLEEP |
11f164d1 | 444 | /** |
445 | * elm_context_save | |
446 | * saves ELM configurations to preserve them across Hardware powered-down | |
447 | */ | |
448 | static int elm_context_save(struct elm_info *info) | |
449 | { | |
450 | struct elm_registers *regs = &info->elm_regs; | |
451 | enum bch_ecc bch_type = info->bch_type; | |
452 | u32 offset = 0, i; | |
453 | ||
454 | regs->elm_irqenable = elm_read_reg(info, ELM_IRQENABLE); | |
455 | regs->elm_sysconfig = elm_read_reg(info, ELM_SYSCONFIG); | |
456 | regs->elm_location_config = elm_read_reg(info, ELM_LOCATION_CONFIG); | |
457 | regs->elm_page_ctrl = elm_read_reg(info, ELM_PAGE_CTRL); | |
458 | for (i = 0; i < ERROR_VECTOR_MAX; i++) { | |
459 | offset = i * SYNDROME_FRAGMENT_REG_SIZE; | |
460 | switch (bch_type) { | |
2be589e4 | 461 | case BCH16_ECC: |
462 | regs->elm_syndrome_fragment_6[i] = elm_read_reg(info, | |
463 | ELM_SYNDROME_FRAGMENT_6 + offset); | |
464 | regs->elm_syndrome_fragment_5[i] = elm_read_reg(info, | |
465 | ELM_SYNDROME_FRAGMENT_5 + offset); | |
466 | regs->elm_syndrome_fragment_4[i] = elm_read_reg(info, | |
467 | ELM_SYNDROME_FRAGMENT_4 + offset); | |
11f164d1 | 468 | case BCH8_ECC: |
469 | regs->elm_syndrome_fragment_3[i] = elm_read_reg(info, | |
470 | ELM_SYNDROME_FRAGMENT_3 + offset); | |
471 | regs->elm_syndrome_fragment_2[i] = elm_read_reg(info, | |
472 | ELM_SYNDROME_FRAGMENT_2 + offset); | |
473 | case BCH4_ECC: | |
474 | regs->elm_syndrome_fragment_1[i] = elm_read_reg(info, | |
475 | ELM_SYNDROME_FRAGMENT_1 + offset); | |
476 | regs->elm_syndrome_fragment_0[i] = elm_read_reg(info, | |
477 | ELM_SYNDROME_FRAGMENT_0 + offset); | |
6938ad40 | 478 | break; |
11f164d1 | 479 | default: |
480 | return -EINVAL; | |
481 | } | |
482 | /* ELM SYNDROME_VALID bit in SYNDROME_FRAGMENT_6[] needs | |
483 | * to be saved for all BCH schemes*/ | |
484 | regs->elm_syndrome_fragment_6[i] = elm_read_reg(info, | |
485 | ELM_SYNDROME_FRAGMENT_6 + offset); | |
486 | } | |
487 | return 0; | |
488 | } | |
489 | ||
490 | /** | |
491 | * elm_context_restore | |
492 | * writes configurations saved duing power-down back into ELM registers | |
493 | */ | |
494 | static int elm_context_restore(struct elm_info *info) | |
495 | { | |
496 | struct elm_registers *regs = &info->elm_regs; | |
497 | enum bch_ecc bch_type = info->bch_type; | |
498 | u32 offset = 0, i; | |
499 | ||
500 | elm_write_reg(info, ELM_IRQENABLE, regs->elm_irqenable); | |
501 | elm_write_reg(info, ELM_SYSCONFIG, regs->elm_sysconfig); | |
502 | elm_write_reg(info, ELM_LOCATION_CONFIG, regs->elm_location_config); | |
503 | elm_write_reg(info, ELM_PAGE_CTRL, regs->elm_page_ctrl); | |
504 | for (i = 0; i < ERROR_VECTOR_MAX; i++) { | |
505 | offset = i * SYNDROME_FRAGMENT_REG_SIZE; | |
506 | switch (bch_type) { | |
2be589e4 | 507 | case BCH16_ECC: |
508 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_6 + offset, | |
509 | regs->elm_syndrome_fragment_6[i]); | |
510 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_5 + offset, | |
511 | regs->elm_syndrome_fragment_5[i]); | |
512 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_4 + offset, | |
513 | regs->elm_syndrome_fragment_4[i]); | |
11f164d1 | 514 | case BCH8_ECC: |
515 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_3 + offset, | |
516 | regs->elm_syndrome_fragment_3[i]); | |
517 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_2 + offset, | |
518 | regs->elm_syndrome_fragment_2[i]); | |
519 | case BCH4_ECC: | |
520 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_1 + offset, | |
521 | regs->elm_syndrome_fragment_1[i]); | |
522 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_0 + offset, | |
523 | regs->elm_syndrome_fragment_0[i]); | |
6938ad40 | 524 | break; |
11f164d1 | 525 | default: |
526 | return -EINVAL; | |
527 | } | |
528 | /* ELM_SYNDROME_VALID bit to be set in last to trigger FSM */ | |
529 | elm_write_reg(info, ELM_SYNDROME_FRAGMENT_6 + offset, | |
530 | regs->elm_syndrome_fragment_6[i] & | |
531 | ELM_SYNDROME_VALID); | |
532 | } | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static int elm_suspend(struct device *dev) | |
537 | { | |
538 | struct elm_info *info = dev_get_drvdata(dev); | |
539 | elm_context_save(info); | |
540 | pm_runtime_put_sync(dev); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | static int elm_resume(struct device *dev) | |
545 | { | |
546 | struct elm_info *info = dev_get_drvdata(dev); | |
547 | pm_runtime_get_sync(dev); | |
548 | elm_context_restore(info); | |
549 | return 0; | |
550 | } | |
8d808959 | 551 | #endif |
11f164d1 | 552 | |
553 | static SIMPLE_DEV_PM_OPS(elm_pm_ops, elm_suspend, elm_resume); | |
554 | ||
bf224335 PA |
555 | #ifdef CONFIG_OF |
556 | static const struct of_device_id elm_of_match[] = { | |
c80e572c | 557 | { .compatible = "ti,am3352-elm" }, |
bf224335 PA |
558 | {}, |
559 | }; | |
560 | MODULE_DEVICE_TABLE(of, elm_of_match); | |
561 | #endif | |
562 | ||
563 | static struct platform_driver elm_driver = { | |
564 | .driver = { | |
c7ea95a3 | 565 | .name = DRIVER_NAME, |
bf224335 | 566 | .of_match_table = of_match_ptr(elm_of_match), |
11f164d1 | 567 | .pm = &elm_pm_ops, |
bf224335 PA |
568 | }, |
569 | .probe = elm_probe, | |
570 | .remove = elm_remove, | |
571 | }; | |
572 | ||
573 | module_platform_driver(elm_driver); | |
574 | ||
575 | MODULE_DESCRIPTION("ELM driver for BCH error correction"); | |
576 | MODULE_AUTHOR("Texas Instruments"); | |
0f0aca5d | 577 | MODULE_ALIAS("platform:" DRIVER_NAME); |
bf224335 | 578 | MODULE_LICENSE("GPL v2"); |