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jbd: Issue cache flush after checkpointing
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / sh_mobile_meram.c
blob4d63490209cdf1431430aa343a513d29e11ba846
1 /*
2 * SuperH Mobile MERAM Driver for SuperH Mobile LCDC Driver
3 *
4 * Copyright (c) 2011 Damian Hobson-Garcia <dhobsong@igel.co.jp>
5 * Takanari Hayama <taki@igel.co.jp>
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/device.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/io.h>
17 #include <linux/slab.h>
18 #include <linux/platform_device.h>
19 #include <video/sh_mobile_meram.h>
20
21 /* meram registers */
22 #define MEVCR1 0x4
23 #define MEVCR1_RST (1 << 31)
24 #define MEVCR1_WD (1 << 30)
25 #define MEVCR1_AMD1 (1 << 29)
26 #define MEVCR1_AMD0 (1 << 28)
27 #define MEQSEL1 0x40
28 #define MEQSEL2 0x44
29
30 #define MExxCTL 0x400
31 #define MExxCTL_BV (1 << 31)
32 #define MExxCTL_BSZ_SHIFT 28
33 #define MExxCTL_MSAR_MASK (0x7ff << MExxCTL_MSAR_SHIFT)
34 #define MExxCTL_MSAR_SHIFT 16
35 #define MExxCTL_NXT_MASK (0x1f << MExxCTL_NXT_SHIFT)
36 #define MExxCTL_NXT_SHIFT 11
37 #define MExxCTL_WD1 (1 << 10)
38 #define MExxCTL_WD0 (1 << 9)
39 #define MExxCTL_WS (1 << 8)
40 #define MExxCTL_CB (1 << 7)
41 #define MExxCTL_WBF (1 << 6)
42 #define MExxCTL_WF (1 << 5)
43 #define MExxCTL_RF (1 << 4)
44 #define MExxCTL_CM (1 << 3)
45 #define MExxCTL_MD_READ (1 << 0)
46 #define MExxCTL_MD_WRITE (2 << 0)
47 #define MExxCTL_MD_ICB_WB (3 << 0)
48 #define MExxCTL_MD_ICB (4 << 0)
49 #define MExxCTL_MD_FB (7 << 0)
50 #define MExxCTL_MD_MASK (7 << 0)
51 #define MExxBSIZE 0x404
52 #define MExxBSIZE_RCNT_SHIFT 28
53 #define MExxBSIZE_YSZM1_SHIFT 16
54 #define MExxBSIZE_XSZM1_SHIFT 0
55 #define MExxMNCF 0x408
56 #define MExxMNCF_KWBNM_SHIFT 28
57 #define MExxMNCF_KRBNM_SHIFT 24
58 #define MExxMNCF_BNM_SHIFT 16
59 #define MExxMNCF_XBV (1 << 15)
60 #define MExxMNCF_CPL_YCBCR444 (1 << 12)
61 #define MExxMNCF_CPL_YCBCR420 (2 << 12)
62 #define MExxMNCF_CPL_YCBCR422 (3 << 12)
63 #define MExxMNCF_CPL_MSK (3 << 12)
64 #define MExxMNCF_BL (1 << 2)
65 #define MExxMNCF_LNM_SHIFT 0
66 #define MExxSARA 0x410
67 #define MExxSARB 0x414
68 #define MExxSBSIZE 0x418
69 #define MExxSBSIZE_HDV (1 << 31)
70 #define MExxSBSIZE_HSZ16 (0 << 28)
71 #define MExxSBSIZE_HSZ32 (1 << 28)
72 #define MExxSBSIZE_HSZ64 (2 << 28)
73 #define MExxSBSIZE_HSZ128 (3 << 28)
74 #define MExxSBSIZE_SBSIZZ_SHIFT 0
75
76 #define MERAM_MExxCTL_VAL(next, addr) \
77 ((((next) << MExxCTL_NXT_SHIFT) & MExxCTL_NXT_MASK) | \
78 (((addr) << MExxCTL_MSAR_SHIFT) & MExxCTL_MSAR_MASK))
79 #define MERAM_MExxBSIZE_VAL(rcnt, yszm1, xszm1) \
80 (((rcnt) << MExxBSIZE_RCNT_SHIFT) | \
81 ((yszm1) << MExxBSIZE_YSZM1_SHIFT) | \
82 ((xszm1) << MExxBSIZE_XSZM1_SHIFT))
83
84 #define SH_MOBILE_MERAM_ICB_NUM 32
85
86 static unsigned long common_regs[] = {
87 MEVCR1,
88 MEQSEL1,
89 MEQSEL2,
90 };
91 #define CMN_REGS_SIZE ARRAY_SIZE(common_regs)
92
93 static unsigned long icb_regs[] = {
94 MExxCTL,
95 MExxBSIZE,
96 MExxMNCF,
97 MExxSARA,
98 MExxSARB,
99 MExxSBSIZE,
100 };
101 #define ICB_REGS_SIZE ARRAY_SIZE(icb_regs)
102
103 struct sh_mobile_meram_priv {
104 void __iomem *base;
105 struct mutex lock;
106 unsigned long used_icb;
107 int used_meram_cache_regions;
108 unsigned long used_meram_cache[SH_MOBILE_MERAM_ICB_NUM];
109 unsigned long cmn_saved_regs[CMN_REGS_SIZE];
110 unsigned long icb_saved_regs[ICB_REGS_SIZE * SH_MOBILE_MERAM_ICB_NUM];
111 };
112
113 /* settings */
114 #define MERAM_SEC_LINE 15
115 #define MERAM_LINE_WIDTH 2048
116
117 /*
118 * MERAM/ICB access functions
119 */
120
121 #define MERAM_ICB_OFFSET(base, idx, off) ((base) + (off) + (idx) * 0x20)
122
123 static inline void meram_write_icb(void __iomem *base, int idx, int off,
124 unsigned long val)
125 {
126 iowrite32(val, MERAM_ICB_OFFSET(base, idx, off));
127 }
128
129 static inline unsigned long meram_read_icb(void __iomem *base, int idx, int off)
130 {
131 return ioread32(MERAM_ICB_OFFSET(base, idx, off));
132 }
133
134 static inline void meram_write_reg(void __iomem *base, int off,
135 unsigned long val)
136 {
137 iowrite32(val, base + off);
138 }
139
140 static inline unsigned long meram_read_reg(void __iomem *base, int off)
141 {
142 return ioread32(base + off);
143 }
144
145 /*
146 * register ICB
147 */
148
149 #define MERAM_CACHE_START(p) ((p) >> 16)
150 #define MERAM_CACHE_END(p) ((p) & 0xffff)
151 #define MERAM_CACHE_SET(o, s) ((((o) & 0xffff) << 16) | \
152 (((o) + (s) - 1) & 0xffff))
153
154 /*
155 * check if there's no overlaps in MERAM allocation.
156 */
157
158 static inline int meram_check_overlap(struct sh_mobile_meram_priv *priv,
159 struct sh_mobile_meram_icb *new)
160 {
161 int i;
162 int used_start, used_end, meram_start, meram_end;
163
164 /* valid ICB? */
165 if (new->marker_icb & ~0x1f || new->cache_icb & ~0x1f)
166 return 1;
167
168 if (test_bit(new->marker_icb, &priv->used_icb) ||
169 test_bit(new->cache_icb, &priv->used_icb))
170 return 1;
171
172 for (i = 0; i < priv->used_meram_cache_regions; i++) {
173 used_start = MERAM_CACHE_START(priv->used_meram_cache[i]);
174 used_end = MERAM_CACHE_END(priv->used_meram_cache[i]);
175 meram_start = new->meram_offset;
176 meram_end = new->meram_offset + new->meram_size;
177
178 if ((meram_start >= used_start && meram_start < used_end) ||
179 (meram_end > used_start && meram_end < used_end))
180 return 1;
181 }
182
183 return 0;
184 }
185
186 /*
187 * mark the specified ICB as used
188 */
189
190 static inline void meram_mark(struct sh_mobile_meram_priv *priv,
191 struct sh_mobile_meram_icb *new)
192 {
193 int n;
194
195 if (new->marker_icb < 0 || new->cache_icb < 0)
196 return;
197
198 __set_bit(new->marker_icb, &priv->used_icb);
199 __set_bit(new->cache_icb, &priv->used_icb);
200
201 n = priv->used_meram_cache_regions;
202
203 priv->used_meram_cache[n] = MERAM_CACHE_SET(new->meram_offset,
204 new->meram_size);
205
206 priv->used_meram_cache_regions++;
207 }
208
209 /*
210 * unmark the specified ICB as used
211 */
212
213 static inline void meram_unmark(struct sh_mobile_meram_priv *priv,
214 struct sh_mobile_meram_icb *icb)
215 {
216 int i;
217 unsigned long pattern;
218
219 if (icb->marker_icb < 0 || icb->cache_icb < 0)
220 return;
221
222 __clear_bit(icb->marker_icb, &priv->used_icb);
223 __clear_bit(icb->cache_icb, &priv->used_icb);
224
225 pattern = MERAM_CACHE_SET(icb->meram_offset, icb->meram_size);
226 for (i = 0; i < priv->used_meram_cache_regions; i++) {
227 if (priv->used_meram_cache[i] == pattern) {
228 while (i < priv->used_meram_cache_regions - 1) {
229 priv->used_meram_cache[i] =
230 priv->used_meram_cache[i + 1] ;
231 i++;
232 }
233 priv->used_meram_cache[i] = 0;
234 priv->used_meram_cache_regions--;
235 break;
236 }
237 }
238 }
239
240 /*
241 * is this a YCbCr(NV12, NV16 or NV24) colorspace
242 */
243 static inline int is_nvcolor(int cspace)
244 {
245 if (cspace == SH_MOBILE_MERAM_PF_NV ||
246 cspace == SH_MOBILE_MERAM_PF_NV24)
247 return 1;
248 return 0;
249 }
250
251 /*
252 * set the next address to fetch
253 */
254 static inline void meram_set_next_addr(struct sh_mobile_meram_priv *priv,
255 struct sh_mobile_meram_cfg *cfg,
256 unsigned long base_addr_y,
257 unsigned long base_addr_c)
258 {
259 unsigned long target;
260
261 target = (cfg->current_reg) ? MExxSARA : MExxSARB;
262 cfg->current_reg ^= 1;
263
264 /* set the next address to fetch */
265 meram_write_icb(priv->base, cfg->icb[0].cache_icb, target,
266 base_addr_y);
267 meram_write_icb(priv->base, cfg->icb[0].marker_icb, target,
268 base_addr_y + cfg->icb[0].cache_unit);
269
270 if (is_nvcolor(cfg->pixelformat)) {
271 meram_write_icb(priv->base, cfg->icb[1].cache_icb, target,
272 base_addr_c);
273 meram_write_icb(priv->base, cfg->icb[1].marker_icb, target,
274 base_addr_c + cfg->icb[1].cache_unit);
275 }
276 }
277
278 /*
279 * get the next ICB address
280 */
281 static inline void meram_get_next_icb_addr(struct sh_mobile_meram_info *pdata,
282 struct sh_mobile_meram_cfg *cfg,
283 unsigned long *icb_addr_y,
284 unsigned long *icb_addr_c)
285 {
286 unsigned long icb_offset;
287
288 if (pdata->addr_mode == SH_MOBILE_MERAM_MODE0)
289 icb_offset = 0x80000000 | (cfg->current_reg << 29);
290 else
291 icb_offset = 0xc0000000 | (cfg->current_reg << 23);
292
293 *icb_addr_y = icb_offset | (cfg->icb[0].marker_icb << 24);
294 if (is_nvcolor(cfg->pixelformat))
295 *icb_addr_c = icb_offset | (cfg->icb[1].marker_icb << 24);
296 }
297
298 #define MERAM_CALC_BYTECOUNT(x, y) \
299 (((x) * (y) + (MERAM_LINE_WIDTH - 1)) & ~(MERAM_LINE_WIDTH - 1))
300
301 /*
302 * initialize MERAM
303 */
304
305 static int meram_init(struct sh_mobile_meram_priv *priv,
306 struct sh_mobile_meram_icb *icb,
307 int xres, int yres, int *out_pitch)
308 {
309 unsigned long total_byte_count = MERAM_CALC_BYTECOUNT(xres, yres);
310 unsigned long bnm;
311 int lcdc_pitch, xpitch, line_cnt;
312 int save_lines;
313
314 /* adjust pitch to 1024, 2048, 4096 or 8192 */
315 lcdc_pitch = (xres - 1) | 1023;
316 lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 1);
317 lcdc_pitch = lcdc_pitch | (lcdc_pitch >> 2);
318 lcdc_pitch += 1;
319
320 /* derive settings */
321 if (lcdc_pitch == 8192 && yres >= 1024) {
322 lcdc_pitch = xpitch = MERAM_LINE_WIDTH;
323 line_cnt = total_byte_count >> 11;
324 *out_pitch = xres;
325 save_lines = (icb->meram_size / 16 / MERAM_SEC_LINE);
326 save_lines *= MERAM_SEC_LINE;
327 } else {
328 xpitch = xres;
329 line_cnt = yres;
330 *out_pitch = lcdc_pitch;
331 save_lines = icb->meram_size / (lcdc_pitch >> 10) / 2;
332 save_lines &= 0xff;
333 }
334 bnm = (save_lines - 1) << 16;
335
336 /* TODO: we better to check if we have enough MERAM buffer size */
337
338 /* set up ICB */
339 meram_write_icb(priv->base, icb->cache_icb, MExxBSIZE,
340 MERAM_MExxBSIZE_VAL(0x0, line_cnt - 1, xpitch - 1));
341 meram_write_icb(priv->base, icb->marker_icb, MExxBSIZE,
342 MERAM_MExxBSIZE_VAL(0xf, line_cnt - 1, xpitch - 1));
343
344 meram_write_icb(priv->base, icb->cache_icb, MExxMNCF, bnm);
345 meram_write_icb(priv->base, icb->marker_icb, MExxMNCF, bnm);
346
347 meram_write_icb(priv->base, icb->cache_icb, MExxSBSIZE, xpitch);
348 meram_write_icb(priv->base, icb->marker_icb, MExxSBSIZE, xpitch);
349
350 /* save a cache unit size */
351 icb->cache_unit = xres * save_lines;
352
353 /*
354 * Set MERAM for framebuffer
355 *
356 * we also chain the cache_icb and the marker_icb.
357 * we also split the allocated MERAM buffer between two ICBs.
358 */
359 meram_write_icb(priv->base, icb->cache_icb, MExxCTL,
360 MERAM_MExxCTL_VAL(icb->marker_icb, icb->meram_offset) |
361 MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
362 MExxCTL_MD_FB);
363 meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
364 MERAM_MExxCTL_VAL(icb->cache_icb, icb->meram_offset +
365 icb->meram_size / 2) |
366 MExxCTL_WD1 | MExxCTL_WD0 | MExxCTL_WS | MExxCTL_CM |
367 MExxCTL_MD_FB);
368
369 return 0;
370 }
371
372 static void meram_deinit(struct sh_mobile_meram_priv *priv,
373 struct sh_mobile_meram_icb *icb)
374 {
375 /* disable ICB */
376 meram_write_icb(priv->base, icb->cache_icb, MExxCTL,
377 MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF);
378 meram_write_icb(priv->base, icb->marker_icb, MExxCTL,
379 MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF);
380 icb->cache_unit = 0;
381 }
382
383 /*
384 * register the ICB
385 */
386
387 static int sh_mobile_meram_register(struct sh_mobile_meram_info *pdata,
388 struct sh_mobile_meram_cfg *cfg,
389 int xres, int yres, int pixelformat,
390 unsigned long base_addr_y,
391 unsigned long base_addr_c,
392 unsigned long *icb_addr_y,
393 unsigned long *icb_addr_c,
394 int *pitch)
395 {
396 struct platform_device *pdev;
397 struct sh_mobile_meram_priv *priv;
398 int n, out_pitch;
399 int error = 0;
400
401 if (!pdata || !pdata->priv || !pdata->pdev || !cfg)
402 return -EINVAL;
403
404 if (pixelformat != SH_MOBILE_MERAM_PF_NV &&
405 pixelformat != SH_MOBILE_MERAM_PF_NV24 &&
406 pixelformat != SH_MOBILE_MERAM_PF_RGB)
407 return -EINVAL;
408
409 priv = pdata->priv;
410 pdev = pdata->pdev;
411
412 dev_dbg(&pdev->dev, "registering %dx%d (%s) (y=%08lx, c=%08lx)",
413 xres, yres, (!pixelformat) ? "yuv" : "rgb",
414 base_addr_y, base_addr_c);
415
416 /* we can't handle wider than 8192px */
417 if (xres > 8192) {
418 dev_err(&pdev->dev, "width exceeding the limit (> 8192).");
419 return -EINVAL;
420 }
421
422 /* do we have at least one ICB config? */
423 if (cfg->icb[0].marker_icb < 0 || cfg->icb[0].cache_icb < 0) {
424 dev_err(&pdev->dev, "at least one ICB is required.");
425 return -EINVAL;
426 }
427
428 mutex_lock(&priv->lock);
429
430 if (priv->used_meram_cache_regions + 2 > SH_MOBILE_MERAM_ICB_NUM) {
431 dev_err(&pdev->dev, "no more ICB available.");
432 error = -EINVAL;
433 goto err;
434 }
435
436 /* make sure that there's no overlaps */
437 if (meram_check_overlap(priv, &cfg->icb[0])) {
438 dev_err(&pdev->dev, "conflicting config detected.");
439 error = -EINVAL;
440 goto err;
441 }
442 n = 1;
443
444 /* do the same if we have the second ICB set */
445 if (cfg->icb[1].marker_icb >= 0 && cfg->icb[1].cache_icb >= 0) {
446 if (meram_check_overlap(priv, &cfg->icb[1])) {
447 dev_err(&pdev->dev, "conflicting config detected.");
448 error = -EINVAL;
449 goto err;
450 }
451 n = 2;
452 }
453
454 if (is_nvcolor(pixelformat) && n != 2) {
455 dev_err(&pdev->dev, "requires two ICB sets for planar Y/C.");
456 error = -EINVAL;
457 goto err;
458 }
459
460 /* we now register the ICB */
461 cfg->pixelformat = pixelformat;
462 meram_mark(priv, &cfg->icb[0]);
463 if (is_nvcolor(pixelformat))
464 meram_mark(priv, &cfg->icb[1]);
465
466 /* initialize MERAM */
467 meram_init(priv, &cfg->icb[0], xres, yres, &out_pitch);
468 *pitch = out_pitch;
469 if (pixelformat == SH_MOBILE_MERAM_PF_NV)
470 meram_init(priv, &cfg->icb[1], xres, (yres + 1) / 2,
471 &out_pitch);
472 else if (pixelformat == SH_MOBILE_MERAM_PF_NV24)
473 meram_init(priv, &cfg->icb[1], 2 * xres, (yres + 1) / 2,
474 &out_pitch);
475
476 cfg->current_reg = 1;
477 meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
478 meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
479
480 dev_dbg(&pdev->dev, "registered - can access via y=%08lx, c=%08lx",
481 *icb_addr_y, *icb_addr_c);
482
483 err:
484 mutex_unlock(&priv->lock);
485 return error;
486 }
487
488 static int sh_mobile_meram_unregister(struct sh_mobile_meram_info *pdata,
489 struct sh_mobile_meram_cfg *cfg)
490 {
491 struct sh_mobile_meram_priv *priv;
492
493 if (!pdata || !pdata->priv || !cfg)
494 return -EINVAL;
495
496 priv = pdata->priv;
497
498 mutex_lock(&priv->lock);
499
500 /* deinit & unmark */
501 if (is_nvcolor(cfg->pixelformat)) {
502 meram_deinit(priv, &cfg->icb[1]);
503 meram_unmark(priv, &cfg->icb[1]);
504 }
505 meram_deinit(priv, &cfg->icb[0]);
506 meram_unmark(priv, &cfg->icb[0]);
507
508 mutex_unlock(&priv->lock);
509
510 return 0;
511 }
512
513 static int sh_mobile_meram_update(struct sh_mobile_meram_info *pdata,
514 struct sh_mobile_meram_cfg *cfg,
515 unsigned long base_addr_y,
516 unsigned long base_addr_c,
517 unsigned long *icb_addr_y,
518 unsigned long *icb_addr_c)
519 {
520 struct sh_mobile_meram_priv *priv;
521
522 if (!pdata || !pdata->priv || !cfg)
523 return -EINVAL;
524
525 priv = pdata->priv;
526
527 mutex_lock(&priv->lock);
528
529 meram_set_next_addr(priv, cfg, base_addr_y, base_addr_c);
530 meram_get_next_icb_addr(pdata, cfg, icb_addr_y, icb_addr_c);
531
532 mutex_unlock(&priv->lock);
533
534 return 0;
535 }
536
537 static int sh_mobile_meram_runtime_suspend(struct device *dev)
538 {
539 struct platform_device *pdev = to_platform_device(dev);
540 struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
541 int k, j;
542
543 for (k = 0; k < CMN_REGS_SIZE; k++)
544 priv->cmn_saved_regs[k] = meram_read_reg(priv->base,
545 common_regs[k]);
546
547 for (j = 0; j < 32; j++) {
548 if (!test_bit(j, &priv->used_icb))
549 continue;
550 for (k = 0; k < ICB_REGS_SIZE; k++) {
551 priv->icb_saved_regs[j * ICB_REGS_SIZE + k] =
552 meram_read_icb(priv->base, j, icb_regs[k]);
553 /* Reset ICB on resume */
554 if (icb_regs[k] == MExxCTL)
555 priv->icb_saved_regs[j * ICB_REGS_SIZE + k] |=
556 MExxCTL_WBF | MExxCTL_WF | MExxCTL_RF;
557 }
558 }
559 return 0;
560 }
561
562 static int sh_mobile_meram_runtime_resume(struct device *dev)
563 {
564 struct platform_device *pdev = to_platform_device(dev);
565 struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
566 int k, j;
567
568 for (j = 0; j < 32; j++) {
569 if (!test_bit(j, &priv->used_icb))
570 continue;
571 for (k = 0; k < ICB_REGS_SIZE; k++) {
572 meram_write_icb(priv->base, j, icb_regs[k],
573 priv->icb_saved_regs[j * ICB_REGS_SIZE + k]);
574 }
575 }
576
577 for (k = 0; k < CMN_REGS_SIZE; k++)
578 meram_write_reg(priv->base, common_regs[k],
579 priv->cmn_saved_regs[k]);
580 return 0;
581 }
582
583 static const struct dev_pm_ops sh_mobile_meram_dev_pm_ops = {
584 .runtime_suspend = sh_mobile_meram_runtime_suspend,
585 .runtime_resume = sh_mobile_meram_runtime_resume,
586 };
587
588 static struct sh_mobile_meram_ops sh_mobile_meram_ops = {
589 .module = THIS_MODULE,
590 .meram_register = sh_mobile_meram_register,
591 .meram_unregister = sh_mobile_meram_unregister,
592 .meram_update = sh_mobile_meram_update,
593 };
594
595 /*
596 * initialize MERAM
597 */
598
599 static int sh_mobile_meram_remove(struct platform_device *pdev);
600
601 static int __devinit sh_mobile_meram_probe(struct platform_device *pdev)
602 {
603 struct sh_mobile_meram_priv *priv;
604 struct sh_mobile_meram_info *pdata = pdev->dev.platform_data;
605 struct resource *res;
606 int error;
607
608 if (!pdata) {
609 dev_err(&pdev->dev, "no platform data defined\n");
610 return -EINVAL;
611 }
612
613 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
614 if (!res) {
615 dev_err(&pdev->dev, "cannot get platform resources\n");
616 return -ENOENT;
617 }
618
619 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
620 if (!priv) {
621 dev_err(&pdev->dev, "cannot allocate device data\n");
622 return -ENOMEM;
623 }
624
625 platform_set_drvdata(pdev, priv);
626
627 /* initialize private data */
628 mutex_init(&priv->lock);
629 priv->base = ioremap_nocache(res->start, resource_size(res));
630 if (!priv->base) {
631 dev_err(&pdev->dev, "ioremap failed\n");
632 error = -EFAULT;
633 goto err;
634 }
635 pdata->ops = &sh_mobile_meram_ops;
636 pdata->priv = priv;
637 pdata->pdev = pdev;
638
639 /* initialize ICB addressing mode */
640 if (pdata->addr_mode == SH_MOBILE_MERAM_MODE1)
641 meram_write_reg(priv->base, MEVCR1, MEVCR1_AMD1);
642
643 pm_runtime_enable(&pdev->dev);
644
645 dev_info(&pdev->dev, "sh_mobile_meram initialized.");
646
647 return 0;
648
649 err:
650 sh_mobile_meram_remove(pdev);
651
652 return error;
653 }
654
655
656 static int sh_mobile_meram_remove(struct platform_device *pdev)
657 {
658 struct sh_mobile_meram_priv *priv = platform_get_drvdata(pdev);
659
660 pm_runtime_disable(&pdev->dev);
661
662 if (priv->base)
663 iounmap(priv->base);
664
665 mutex_destroy(&priv->lock);
666
667 kfree(priv);
668
669 return 0;
670 }
671
672 static struct platform_driver sh_mobile_meram_driver = {
673 .driver = {
674 .name = "sh_mobile_meram",
675 .owner = THIS_MODULE,
676 .pm = &sh_mobile_meram_dev_pm_ops,
677 },
678 .probe = sh_mobile_meram_probe,
679 .remove = sh_mobile_meram_remove,
680 };
681
682 static int __init sh_mobile_meram_init(void)
683 {
684 return platform_driver_register(&sh_mobile_meram_driver);
685 }
686
687 static void __exit sh_mobile_meram_exit(void)
688 {
689 platform_driver_unregister(&sh_mobile_meram_driver);
690 }
691
692 module_init(sh_mobile_meram_init);
693 module_exit(sh_mobile_meram_exit);
694
695 MODULE_DESCRIPTION("SuperH Mobile MERAM driver");
696 MODULE_AUTHOR("Damian Hobson-Garcia / Takanari Hayama");
697 MODULE_LICENSE("GPL v2");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree