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omap: i2c: add a timeout to the busy waiting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / sm501.c
blobbc9275c12133f2817c54dafb04fd1856a54870c1
1 /* linux/drivers/mfd/sm501.c
2 *
3 * Copyright (C) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 * Vincent Sanders <vince@simtec.co.uk>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * SM501 MFD driver
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/pci.h>
22 #include <linux/i2c-gpio.h>
23 #include <linux/slab.h>
24
25 #include <linux/sm501.h>
26 #include <linux/sm501-regs.h>
27 #include <linux/serial_8250.h>
28
29 #include <asm/io.h>
30
31 struct sm501_device {
32 struct list_head list;
33 struct platform_device pdev;
34 };
35
36 struct sm501_gpio;
37
38 #ifdef CONFIG_MFD_SM501_GPIO
39 #include <linux/gpio.h>
40
41 struct sm501_gpio_chip {
42 struct gpio_chip gpio;
43 struct sm501_gpio *ourgpio; /* to get back to parent. */
44 void __iomem *regbase;
45 void __iomem *control; /* address of control reg. */
46 };
47
48 struct sm501_gpio {
49 struct sm501_gpio_chip low;
50 struct sm501_gpio_chip high;
51 spinlock_t lock;
52
53 unsigned int registered : 1;
54 void __iomem *regs;
55 struct resource *regs_res;
56 };
57 #else
58 struct sm501_gpio {
59 /* no gpio support, empty definition for sm501_devdata. */
60 };
61 #endif
62
63 struct sm501_devdata {
64 spinlock_t reg_lock;
65 struct mutex clock_lock;
66 struct list_head devices;
67 struct sm501_gpio gpio;
68
69 struct device *dev;
70 struct resource *io_res;
71 struct resource *mem_res;
72 struct resource *regs_claim;
73 struct sm501_platdata *platdata;
74
75
76 unsigned int in_suspend;
77 unsigned long pm_misc;
78
79 int unit_power[20];
80 unsigned int pdev_id;
81 unsigned int irq;
82 void __iomem *regs;
83 unsigned int rev;
84 };
85
86
87 #define MHZ (1000 * 1000)
88
89 #ifdef DEBUG
90 static const unsigned int div_tab[] = {
91 [0] = 1,
92 [1] = 2,
93 [2] = 4,
94 [3] = 8,
95 [4] = 16,
96 [5] = 32,
97 [6] = 64,
98 [7] = 128,
99 [8] = 3,
100 [9] = 6,
101 [10] = 12,
102 [11] = 24,
103 [12] = 48,
104 [13] = 96,
105 [14] = 192,
106 [15] = 384,
107 [16] = 5,
108 [17] = 10,
109 [18] = 20,
110 [19] = 40,
111 [20] = 80,
112 [21] = 160,
113 [22] = 320,
114 [23] = 604,
115 };
116
117 static unsigned long decode_div(unsigned long pll2, unsigned long val,
118 unsigned int lshft, unsigned int selbit,
119 unsigned long mask)
120 {
121 if (val & selbit)
122 pll2 = 288 * MHZ;
123
124 return pll2 / div_tab[(val >> lshft) & mask];
125 }
126
127 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
128
129 /* sm501_dump_clk
130 *
131 * Print out the current clock configuration for the device
132 */
133
134 static void sm501_dump_clk(struct sm501_devdata *sm)
135 {
136 unsigned long misct = readl(sm->regs + SM501_MISC_TIMING);
137 unsigned long pm0 = readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
138 unsigned long pm1 = readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
139 unsigned long pmc = readl(sm->regs + SM501_POWER_MODE_CONTROL);
140 unsigned long sdclk0, sdclk1;
141 unsigned long pll2 = 0;
142
143 switch (misct & 0x30) {
144 case 0x00:
145 pll2 = 336 * MHZ;
146 break;
147 case 0x10:
148 pll2 = 288 * MHZ;
149 break;
150 case 0x20:
151 pll2 = 240 * MHZ;
152 break;
153 case 0x30:
154 pll2 = 192 * MHZ;
155 break;
156 }
157
158 sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
159 sdclk0 /= div_tab[((misct >> 8) & 0xf)];
160
161 sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
162 sdclk1 /= div_tab[((misct >> 16) & 0xf)];
163
164 dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
165 misct, pm0, pm1);
166
167 dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
168 fmt_freq(pll2), sdclk0, sdclk1);
169
170 dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
171
172 dev_dbg(sm->dev, "PM0[%c]: "
173 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
174 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
175 (pmc & 3 ) == 0 ? '*' : '-',
176 fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
177 fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
178 fmt_freq(decode_div(pll2, pm0, 8, 1<<12, 15)),
179 fmt_freq(decode_div(pll2, pm0, 0, 1<<4, 15)));
180
181 dev_dbg(sm->dev, "PM1[%c]: "
182 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
183 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
184 (pmc & 3 ) == 1 ? '*' : '-',
185 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
186 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
187 fmt_freq(decode_div(pll2, pm1, 8, 1<<12, 15)),
188 fmt_freq(decode_div(pll2, pm1, 0, 1<<4, 15)));
189 }
190
191 static void sm501_dump_regs(struct sm501_devdata *sm)
192 {
193 void __iomem *regs = sm->regs;
194
195 dev_info(sm->dev, "System Control %08x\n",
196 readl(regs + SM501_SYSTEM_CONTROL));
197 dev_info(sm->dev, "Misc Control %08x\n",
198 readl(regs + SM501_MISC_CONTROL));
199 dev_info(sm->dev, "GPIO Control Low %08x\n",
200 readl(regs + SM501_GPIO31_0_CONTROL));
201 dev_info(sm->dev, "GPIO Control Hi %08x\n",
202 readl(regs + SM501_GPIO63_32_CONTROL));
203 dev_info(sm->dev, "DRAM Control %08x\n",
204 readl(regs + SM501_DRAM_CONTROL));
205 dev_info(sm->dev, "Arbitration Ctrl %08x\n",
206 readl(regs + SM501_ARBTRTN_CONTROL));
207 dev_info(sm->dev, "Misc Timing %08x\n",
208 readl(regs + SM501_MISC_TIMING));
209 }
210
211 static void sm501_dump_gate(struct sm501_devdata *sm)
212 {
213 dev_info(sm->dev, "CurrentGate %08x\n",
214 readl(sm->regs + SM501_CURRENT_GATE));
215 dev_info(sm->dev, "CurrentClock %08x\n",
216 readl(sm->regs + SM501_CURRENT_CLOCK));
217 dev_info(sm->dev, "PowerModeControl %08x\n",
218 readl(sm->regs + SM501_POWER_MODE_CONTROL));
219 }
220
221 #else
222 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
223 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
224 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
225 #endif
226
227 /* sm501_sync_regs
228 *
229 * ensure the
230 */
231
232 static void sm501_sync_regs(struct sm501_devdata *sm)
233 {
234 readl(sm->regs);
235 }
236
237 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
238 {
239 /* during suspend/resume, we are currently not allowed to sleep,
240 * so change to using mdelay() instead of msleep() if we
241 * are in one of these paths */
242
243 if (sm->in_suspend)
244 mdelay(delay);
245 else
246 msleep(delay);
247 }
248
249 /* sm501_misc_control
250 *
251 * alters the miscellaneous control parameters
252 */
253
254 int sm501_misc_control(struct device *dev,
255 unsigned long set, unsigned long clear)
256 {
257 struct sm501_devdata *sm = dev_get_drvdata(dev);
258 unsigned long misc;
259 unsigned long save;
260 unsigned long to;
261
262 spin_lock_irqsave(&sm->reg_lock, save);
263
264 misc = readl(sm->regs + SM501_MISC_CONTROL);
265 to = (misc & ~clear) | set;
266
267 if (to != misc) {
268 writel(to, sm->regs + SM501_MISC_CONTROL);
269 sm501_sync_regs(sm);
270
271 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
272 }
273
274 spin_unlock_irqrestore(&sm->reg_lock, save);
275 return to;
276 }
277
278 EXPORT_SYMBOL_GPL(sm501_misc_control);
279
280 /* sm501_modify_reg
281 *
282 * Modify a register in the SM501 which may be shared with other
283 * drivers.
284 */
285
286 unsigned long sm501_modify_reg(struct device *dev,
287 unsigned long reg,
288 unsigned long set,
289 unsigned long clear)
290 {
291 struct sm501_devdata *sm = dev_get_drvdata(dev);
292 unsigned long data;
293 unsigned long save;
294
295 spin_lock_irqsave(&sm->reg_lock, save);
296
297 data = readl(sm->regs + reg);
298 data |= set;
299 data &= ~clear;
300
301 writel(data, sm->regs + reg);
302 sm501_sync_regs(sm);
303
304 spin_unlock_irqrestore(&sm->reg_lock, save);
305
306 return data;
307 }
308
309 EXPORT_SYMBOL_GPL(sm501_modify_reg);
310
311 /* sm501_unit_power
312 *
313 * alters the power active gate to set specific units on or off
314 */
315
316 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
317 {
318 struct sm501_devdata *sm = dev_get_drvdata(dev);
319 unsigned long mode;
320 unsigned long gate;
321 unsigned long clock;
322
323 mutex_lock(&sm->clock_lock);
324
325 mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
326 gate = readl(sm->regs + SM501_CURRENT_GATE);
327 clock = readl(sm->regs + SM501_CURRENT_CLOCK);
328
329 mode &= 3; /* get current power mode */
330
331 if (unit >= ARRAY_SIZE(sm->unit_power)) {
332 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
333 goto already;
334 }
335
336 dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
337 sm->unit_power[unit], to);
338
339 if (to == 0 && sm->unit_power[unit] == 0) {
340 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
341 goto already;
342 }
343
344 sm->unit_power[unit] += to ? 1 : -1;
345 to = sm->unit_power[unit] ? 1 : 0;
346
347 if (to) {
348 if (gate & (1 << unit))
349 goto already;
350 gate |= (1 << unit);
351 } else {
352 if (!(gate & (1 << unit)))
353 goto already;
354 gate &= ~(1 << unit);
355 }
356
357 switch (mode) {
358 case 1:
359 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
360 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
361 mode = 0;
362 break;
363 case 2:
364 case 0:
365 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
366 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
367 mode = 1;
368 break;
369
370 default:
371 gate = -1;
372 goto already;
373 }
374
375 writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
376 sm501_sync_regs(sm);
377
378 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
379 gate, clock, mode);
380
381 sm501_mdelay(sm, 16);
382
383 already:
384 mutex_unlock(&sm->clock_lock);
385 return gate;
386 }
387
388 EXPORT_SYMBOL_GPL(sm501_unit_power);
389
390
391 /* Perform a rounded division. */
392 static long sm501fb_round_div(long num, long denom)
393 {
394 /* n / d + 1 / 2 = (2n + d) / 2d */
395 return (2 * num + denom) / (2 * denom);
396 }
397
398 /* clock value structure. */
399 struct sm501_clock {
400 unsigned long mclk;
401 int divider;
402 int shift;
403 unsigned int m, n, k;
404 };
405
406 /* sm501_calc_clock
407 *
408 * Calculates the nearest discrete clock frequency that
409 * can be achieved with the specified input clock.
410 * the maximum divisor is 3 or 5
411 */
412
413 static int sm501_calc_clock(unsigned long freq,
414 struct sm501_clock *clock,
415 int max_div,
416 unsigned long mclk,
417 long *best_diff)
418 {
419 int ret = 0;
420 int divider;
421 int shift;
422 long diff;
423
424 /* try dividers 1 and 3 for CRT and for panel,
425 try divider 5 for panel only.*/
426
427 for (divider = 1; divider <= max_div; divider += 2) {
428 /* try all 8 shift values.*/
429 for (shift = 0; shift < 8; shift++) {
430 /* Calculate difference to requested clock */
431 diff = sm501fb_round_div(mclk, divider << shift) - freq;
432 if (diff < 0)
433 diff = -diff;
434
435 /* If it is less than the current, use it */
436 if (diff < *best_diff) {
437 *best_diff = diff;
438
439 clock->mclk = mclk;
440 clock->divider = divider;
441 clock->shift = shift;
442 ret = 1;
443 }
444 }
445 }
446
447 return ret;
448 }
449
450 /* sm501_calc_pll
451 *
452 * Calculates the nearest discrete clock frequency that can be
453 * achieved using the programmable PLL.
454 * the maximum divisor is 3 or 5
455 */
456
457 static unsigned long sm501_calc_pll(unsigned long freq,
458 struct sm501_clock *clock,
459 int max_div)
460 {
461 unsigned long mclk;
462 unsigned int m, n, k;
463 long best_diff = 999999999;
464
465 /*
466 * The SM502 datasheet doesn't specify the min/max values for M and N.
467 * N = 1 at least doesn't work in practice.
468 */
469 for (m = 2; m <= 255; m++) {
470 for (n = 2; n <= 127; n++) {
471 for (k = 0; k <= 1; k++) {
472 mclk = (24000000UL * m / n) >> k;
473
474 if (sm501_calc_clock(freq, clock, max_div,
475 mclk, &best_diff)) {
476 clock->m = m;
477 clock->n = n;
478 clock->k = k;
479 }
480 }
481 }
482 }
483
484 /* Return best clock. */
485 return clock->mclk / (clock->divider << clock->shift);
486 }
487
488 /* sm501_select_clock
489 *
490 * Calculates the nearest discrete clock frequency that can be
491 * achieved using the 288MHz and 336MHz PLLs.
492 * the maximum divisor is 3 or 5
493 */
494
495 static unsigned long sm501_select_clock(unsigned long freq,
496 struct sm501_clock *clock,
497 int max_div)
498 {
499 unsigned long mclk;
500 long best_diff = 999999999;
501
502 /* Try 288MHz and 336MHz clocks. */
503 for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
504 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
505 }
506
507 /* Return best clock. */
508 return clock->mclk / (clock->divider << clock->shift);
509 }
510
511 /* sm501_set_clock
512 *
513 * set one of the four clock sources to the closest available frequency to
514 * the one specified
515 */
516
517 unsigned long sm501_set_clock(struct device *dev,
518 int clksrc,
519 unsigned long req_freq)
520 {
521 struct sm501_devdata *sm = dev_get_drvdata(dev);
522 unsigned long mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
523 unsigned long gate = readl(sm->regs + SM501_CURRENT_GATE);
524 unsigned long clock = readl(sm->regs + SM501_CURRENT_CLOCK);
525 unsigned char reg;
526 unsigned int pll_reg = 0;
527 unsigned long sm501_freq; /* the actual frequency achieved */
528
529 struct sm501_clock to;
530
531 /* find achivable discrete frequency and setup register value
532 * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
533 * has an extra bit for the divider */
534
535 switch (clksrc) {
536 case SM501_CLOCK_P2XCLK:
537 /* This clock is divided in half so to achieve the
538 * requested frequency the value must be multiplied by
539 * 2. This clock also has an additional pre divisor */
540
541 if (sm->rev >= 0xC0) {
542 /* SM502 -> use the programmable PLL */
543 sm501_freq = (sm501_calc_pll(2 * req_freq,
544 &to, 5) / 2);
545 reg = to.shift & 0x07;/* bottom 3 bits are shift */
546 if (to.divider == 3)
547 reg |= 0x08; /* /3 divider required */
548 else if (to.divider == 5)
549 reg |= 0x10; /* /5 divider required */
550 reg |= 0x40; /* select the programmable PLL */
551 pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
552 } else {
553 sm501_freq = (sm501_select_clock(2 * req_freq,
554 &to, 5) / 2);
555 reg = to.shift & 0x07;/* bottom 3 bits are shift */
556 if (to.divider == 3)
557 reg |= 0x08; /* /3 divider required */
558 else if (to.divider == 5)
559 reg |= 0x10; /* /5 divider required */
560 if (to.mclk != 288000000)
561 reg |= 0x20; /* which mclk pll is source */
562 }
563 break;
564
565 case SM501_CLOCK_V2XCLK:
566 /* This clock is divided in half so to achieve the
567 * requested frequency the value must be multiplied by 2. */
568
569 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
570 reg=to.shift & 0x07; /* bottom 3 bits are shift */
571 if (to.divider == 3)
572 reg |= 0x08; /* /3 divider required */
573 if (to.mclk != 288000000)
574 reg |= 0x10; /* which mclk pll is source */
575 break;
576
577 case SM501_CLOCK_MCLK:
578 case SM501_CLOCK_M1XCLK:
579 /* These clocks are the same and not further divided */
580
581 sm501_freq = sm501_select_clock( req_freq, &to, 3);
582 reg=to.shift & 0x07; /* bottom 3 bits are shift */
583 if (to.divider == 3)
584 reg |= 0x08; /* /3 divider required */
585 if (to.mclk != 288000000)
586 reg |= 0x10; /* which mclk pll is source */
587 break;
588
589 default:
590 return 0; /* this is bad */
591 }
592
593 mutex_lock(&sm->clock_lock);
594
595 mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
596 gate = readl(sm->regs + SM501_CURRENT_GATE);
597 clock = readl(sm->regs + SM501_CURRENT_CLOCK);
598
599 clock = clock & ~(0xFF << clksrc);
600 clock |= reg<<clksrc;
601
602 mode &= 3; /* find current mode */
603
604 switch (mode) {
605 case 1:
606 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
607 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
608 mode = 0;
609 break;
610 case 2:
611 case 0:
612 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
613 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
614 mode = 1;
615 break;
616
617 default:
618 mutex_unlock(&sm->clock_lock);
619 return -1;
620 }
621
622 writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
623
624 if (pll_reg)
625 writel(pll_reg, sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
626
627 sm501_sync_regs(sm);
628
629 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
630 gate, clock, mode);
631
632 sm501_mdelay(sm, 16);
633 mutex_unlock(&sm->clock_lock);
634
635 sm501_dump_clk(sm);
636
637 return sm501_freq;
638 }
639
640 EXPORT_SYMBOL_GPL(sm501_set_clock);
641
642 /* sm501_find_clock
643 *
644 * finds the closest available frequency for a given clock
645 */
646
647 unsigned long sm501_find_clock(struct device *dev,
648 int clksrc,
649 unsigned long req_freq)
650 {
651 struct sm501_devdata *sm = dev_get_drvdata(dev);
652 unsigned long sm501_freq; /* the frequency achieveable by the 501 */
653 struct sm501_clock to;
654
655 switch (clksrc) {
656 case SM501_CLOCK_P2XCLK:
657 if (sm->rev >= 0xC0) {
658 /* SM502 -> use the programmable PLL */
659 sm501_freq = (sm501_calc_pll(2 * req_freq,
660 &to, 5) / 2);
661 } else {
662 sm501_freq = (sm501_select_clock(2 * req_freq,
663 &to, 5) / 2);
664 }
665 break;
666
667 case SM501_CLOCK_V2XCLK:
668 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
669 break;
670
671 case SM501_CLOCK_MCLK:
672 case SM501_CLOCK_M1XCLK:
673 sm501_freq = sm501_select_clock(req_freq, &to, 3);
674 break;
675
676 default:
677 sm501_freq = 0; /* error */
678 }
679
680 return sm501_freq;
681 }
682
683 EXPORT_SYMBOL_GPL(sm501_find_clock);
684
685 static struct sm501_device *to_sm_device(struct platform_device *pdev)
686 {
687 return container_of(pdev, struct sm501_device, pdev);
688 }
689
690 /* sm501_device_release
691 *
692 * A release function for the platform devices we create to allow us to
693 * free any items we allocated
694 */
695
696 static void sm501_device_release(struct device *dev)
697 {
698 kfree(to_sm_device(to_platform_device(dev)));
699 }
700
701 /* sm501_create_subdev
702 *
703 * Create a skeleton platform device with resources for passing to a
704 * sub-driver
705 */
706
707 static struct platform_device *
708 sm501_create_subdev(struct sm501_devdata *sm, char *name,
709 unsigned int res_count, unsigned int platform_data_size)
710 {
711 struct sm501_device *smdev;
712
713 smdev = kzalloc(sizeof(struct sm501_device) +
714 (sizeof(struct resource) * res_count) +
715 platform_data_size, GFP_KERNEL);
716 if (!smdev)
717 return NULL;
718
719 smdev->pdev.dev.release = sm501_device_release;
720
721 smdev->pdev.name = name;
722 smdev->pdev.id = sm->pdev_id;
723 smdev->pdev.dev.parent = sm->dev;
724
725 if (res_count) {
726 smdev->pdev.resource = (struct resource *)(smdev+1);
727 smdev->pdev.num_resources = res_count;
728 }
729 if (platform_data_size)
730 smdev->pdev.dev.platform_data = (void *)(smdev+1);
731
732 return &smdev->pdev;
733 }
734
735 /* sm501_register_device
736 *
737 * Register a platform device created with sm501_create_subdev()
738 */
739
740 static int sm501_register_device(struct sm501_devdata *sm,
741 struct platform_device *pdev)
742 {
743 struct sm501_device *smdev = to_sm_device(pdev);
744 int ptr;
745 int ret;
746
747 for (ptr = 0; ptr < pdev->num_resources; ptr++) {
748 printk(KERN_DEBUG "%s[%d] flags %08lx: %08llx..%08llx\n",
749 pdev->name, ptr,
750 pdev->resource[ptr].flags,
751 (unsigned long long)pdev->resource[ptr].start,
752 (unsigned long long)pdev->resource[ptr].end);
753 }
754
755 ret = platform_device_register(pdev);
756
757 if (ret >= 0) {
758 dev_dbg(sm->dev, "registered %s\n", pdev->name);
759 list_add_tail(&smdev->list, &sm->devices);
760 } else
761 dev_err(sm->dev, "error registering %s (%d)\n",
762 pdev->name, ret);
763
764 return ret;
765 }
766
767 /* sm501_create_subio
768 *
769 * Fill in an IO resource for a sub device
770 */
771
772 static void sm501_create_subio(struct sm501_devdata *sm,
773 struct resource *res,
774 resource_size_t offs,
775 resource_size_t size)
776 {
777 res->flags = IORESOURCE_MEM;
778 res->parent = sm->io_res;
779 res->start = sm->io_res->start + offs;
780 res->end = res->start + size - 1;
781 }
782
783 /* sm501_create_mem
784 *
785 * Fill in an MEM resource for a sub device
786 */
787
788 static void sm501_create_mem(struct sm501_devdata *sm,
789 struct resource *res,
790 resource_size_t *offs,
791 resource_size_t size)
792 {
793 *offs -= size; /* adjust memory size */
794
795 res->flags = IORESOURCE_MEM;
796 res->parent = sm->mem_res;
797 res->start = sm->mem_res->start + *offs;
798 res->end = res->start + size - 1;
799 }
800
801 /* sm501_create_irq
802 *
803 * Fill in an IRQ resource for a sub device
804 */
805
806 static void sm501_create_irq(struct sm501_devdata *sm,
807 struct resource *res)
808 {
809 res->flags = IORESOURCE_IRQ;
810 res->parent = NULL;
811 res->start = res->end = sm->irq;
812 }
813
814 static int sm501_register_usbhost(struct sm501_devdata *sm,
815 resource_size_t *mem_avail)
816 {
817 struct platform_device *pdev;
818
819 pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
820 if (!pdev)
821 return -ENOMEM;
822
823 sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
824 sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
825 sm501_create_irq(sm, &pdev->resource[2]);
826
827 return sm501_register_device(sm, pdev);
828 }
829
830 static void sm501_setup_uart_data(struct sm501_devdata *sm,
831 struct plat_serial8250_port *uart_data,
832 unsigned int offset)
833 {
834 uart_data->membase = sm->regs + offset;
835 uart_data->mapbase = sm->io_res->start + offset;
836 uart_data->iotype = UPIO_MEM;
837 uart_data->irq = sm->irq;
838 uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
839 uart_data->regshift = 2;
840 uart_data->uartclk = (9600 * 16);
841 }
842
843 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
844 {
845 struct platform_device *pdev;
846 struct plat_serial8250_port *uart_data;
847
848 pdev = sm501_create_subdev(sm, "serial8250", 0,
849 sizeof(struct plat_serial8250_port) * 3);
850 if (!pdev)
851 return -ENOMEM;
852
853 uart_data = pdev->dev.platform_data;
854
855 if (devices & SM501_USE_UART0) {
856 sm501_setup_uart_data(sm, uart_data++, 0x30000);
857 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
858 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
859 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
860 }
861 if (devices & SM501_USE_UART1) {
862 sm501_setup_uart_data(sm, uart_data++, 0x30020);
863 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
864 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
865 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
866 }
867
868 pdev->id = PLAT8250_DEV_SM501;
869
870 return sm501_register_device(sm, pdev);
871 }
872
873 static int sm501_register_display(struct sm501_devdata *sm,
874 resource_size_t *mem_avail)
875 {
876 struct platform_device *pdev;
877
878 pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
879 if (!pdev)
880 return -ENOMEM;
881
882 sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
883 sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
884 sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
885 sm501_create_irq(sm, &pdev->resource[3]);
886
887 return sm501_register_device(sm, pdev);
888 }
889
890 #ifdef CONFIG_MFD_SM501_GPIO
891
892 static inline struct sm501_gpio_chip *to_sm501_gpio(struct gpio_chip *gc)
893 {
894 return container_of(gc, struct sm501_gpio_chip, gpio);
895 }
896
897 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
898 {
899 return container_of(gpio, struct sm501_devdata, gpio);
900 }
901
902 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
903
904 {
905 struct sm501_gpio_chip *smgpio = to_sm501_gpio(chip);
906 unsigned long result;
907
908 result = readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
909 result >>= offset;
910
911 return result & 1UL;
912 }
913
914 static void sm501_gpio_ensure_gpio(struct sm501_gpio_chip *smchip,
915 unsigned long bit)
916 {
917 unsigned long ctrl;
918
919 /* check and modify if this pin is not set as gpio. */
920
921 if (readl(smchip->control) & bit) {
922 dev_info(sm501_gpio_to_dev(smchip->ourgpio)->dev,
923 "changing mode of gpio, bit %08lx\n", bit);
924
925 ctrl = readl(smchip->control);
926 ctrl &= ~bit;
927 writel(ctrl, smchip->control);
928
929 sm501_sync_regs(sm501_gpio_to_dev(smchip->ourgpio));
930 }
931 }
932
933 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
934
935 {
936 struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
937 struct sm501_gpio *smgpio = smchip->ourgpio;
938 unsigned long bit = 1 << offset;
939 void __iomem *regs = smchip->regbase;
940 unsigned long save;
941 unsigned long val;
942
943 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
944 __func__, chip, offset);
945
946 spin_lock_irqsave(&smgpio->lock, save);
947
948 val = readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
949 if (value)
950 val |= bit;
951 writel(val, regs);
952
953 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
954 sm501_gpio_ensure_gpio(smchip, bit);
955
956 spin_unlock_irqrestore(&smgpio->lock, save);
957 }
958
959 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
960 {
961 struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
962 struct sm501_gpio *smgpio = smchip->ourgpio;
963 void __iomem *regs = smchip->regbase;
964 unsigned long bit = 1 << offset;
965 unsigned long save;
966 unsigned long ddr;
967
968 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
969 __func__, chip, offset);
970
971 spin_lock_irqsave(&smgpio->lock, save);
972
973 ddr = readl(regs + SM501_GPIO_DDR_LOW);
974 writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
975
976 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
977 sm501_gpio_ensure_gpio(smchip, bit);
978
979 spin_unlock_irqrestore(&smgpio->lock, save);
980
981 return 0;
982 }
983
984 static int sm501_gpio_output(struct gpio_chip *chip,
985 unsigned offset, int value)
986 {
987 struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
988 struct sm501_gpio *smgpio = smchip->ourgpio;
989 unsigned long bit = 1 << offset;
990 void __iomem *regs = smchip->regbase;
991 unsigned long save;
992 unsigned long val;
993 unsigned long ddr;
994
995 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
996 __func__, chip, offset, value);
997
998 spin_lock_irqsave(&smgpio->lock, save);
999
1000 val = readl(regs + SM501_GPIO_DATA_LOW);
1001 if (value)
1002 val |= bit;
1003 else
1004 val &= ~bit;
1005 writel(val, regs);
1006
1007 ddr = readl(regs + SM501_GPIO_DDR_LOW);
1008 writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
1009
1010 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1011 writel(val, regs + SM501_GPIO_DATA_LOW);
1012
1013 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1014 spin_unlock_irqrestore(&smgpio->lock, save);
1015
1016 return 0;
1017 }
1018
1019 static struct gpio_chip gpio_chip_template = {
1020 .ngpio = 32,
1021 .direction_input = sm501_gpio_input,
1022 .direction_output = sm501_gpio_output,
1023 .set = sm501_gpio_set,
1024 .get = sm501_gpio_get,
1025 };
1026
1027 static int __devinit sm501_gpio_register_chip(struct sm501_devdata *sm,
1028 struct sm501_gpio *gpio,
1029 struct sm501_gpio_chip *chip)
1030 {
1031 struct sm501_platdata *pdata = sm->platdata;
1032 struct gpio_chip *gchip = &chip->gpio;
1033 int base = pdata->gpio_base;
1034
1035 chip->gpio = gpio_chip_template;
1036
1037 if (chip == &gpio->high) {
1038 if (base > 0)
1039 base += 32;
1040 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1041 chip->control = sm->regs + SM501_GPIO63_32_CONTROL;
1042 gchip->label = "SM501-HIGH";
1043 } else {
1044 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1045 chip->control = sm->regs + SM501_GPIO31_0_CONTROL;
1046 gchip->label = "SM501-LOW";
1047 }
1048
1049 gchip->base = base;
1050 chip->ourgpio = gpio;
1051
1052 return gpiochip_add(gchip);
1053 }
1054
1055 static int __devinit sm501_register_gpio(struct sm501_devdata *sm)
1056 {
1057 struct sm501_gpio *gpio = &sm->gpio;
1058 resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1059 int ret;
1060 int tmp;
1061
1062 dev_dbg(sm->dev, "registering gpio block %08llx\n",
1063 (unsigned long long)iobase);
1064
1065 spin_lock_init(&gpio->lock);
1066
1067 gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1068 if (gpio->regs_res == NULL) {
1069 dev_err(sm->dev, "gpio: failed to request region\n");
1070 return -ENXIO;
1071 }
1072
1073 gpio->regs = ioremap(iobase, 0x20);
1074 if (gpio->regs == NULL) {
1075 dev_err(sm->dev, "gpio: failed to remap registers\n");
1076 ret = -ENXIO;
1077 goto err_claimed;
1078 }
1079
1080 /* Register both our chips. */
1081
1082 ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1083 if (ret) {
1084 dev_err(sm->dev, "failed to add low chip\n");
1085 goto err_mapped;
1086 }
1087
1088 ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1089 if (ret) {
1090 dev_err(sm->dev, "failed to add high chip\n");
1091 goto err_low_chip;
1092 }
1093
1094 gpio->registered = 1;
1095
1096 return 0;
1097
1098 err_low_chip:
1099 tmp = gpiochip_remove(&gpio->low.gpio);
1100 if (tmp) {
1101 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1102 return ret;
1103 }
1104
1105 err_mapped:
1106 iounmap(gpio->regs);
1107
1108 err_claimed:
1109 release_resource(gpio->regs_res);
1110 kfree(gpio->regs_res);
1111
1112 return ret;
1113 }
1114
1115 static void sm501_gpio_remove(struct sm501_devdata *sm)
1116 {
1117 struct sm501_gpio *gpio = &sm->gpio;
1118 int ret;
1119
1120 if (!sm->gpio.registered)
1121 return;
1122
1123 ret = gpiochip_remove(&gpio->low.gpio);
1124 if (ret)
1125 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1126
1127 ret = gpiochip_remove(&gpio->high.gpio);
1128 if (ret)
1129 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1130
1131 iounmap(gpio->regs);
1132 release_resource(gpio->regs_res);
1133 kfree(gpio->regs_res);
1134 }
1135
1136 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1137 {
1138 struct sm501_gpio *gpio = &sm->gpio;
1139 int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1140
1141 return (pin % 32) + base;
1142 }
1143
1144 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1145 {
1146 return sm->gpio.registered;
1147 }
1148 #else
1149 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1150 {
1151 return 0;
1152 }
1153
1154 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1155 {
1156 }
1157
1158 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1159 {
1160 return -1;
1161 }
1162
1163 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1164 {
1165 return 0;
1166 }
1167 #endif
1168
1169 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1170 struct sm501_platdata_gpio_i2c *iic)
1171 {
1172 struct i2c_gpio_platform_data *icd;
1173 struct platform_device *pdev;
1174
1175 pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1176 sizeof(struct i2c_gpio_platform_data));
1177 if (!pdev)
1178 return -ENOMEM;
1179
1180 icd = pdev->dev.platform_data;
1181
1182 /* We keep the pin_sda and pin_scl fields relative in case the
1183 * same platform data is passed to >1 SM501.
1184 */
1185
1186 icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1187 icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1188 icd->timeout = iic->timeout;
1189 icd->udelay = iic->udelay;
1190
1191 /* note, we can't use either of the pin numbers, as the i2c-gpio
1192 * driver uses the platform.id field to generate the bus number
1193 * to register with the i2c core; The i2c core doesn't have enough
1194 * entries to deal with anything we currently use.
1195 */
1196
1197 pdev->id = iic->bus_num;
1198
1199 dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1200 iic->bus_num,
1201 icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1202
1203 return sm501_register_device(sm, pdev);
1204 }
1205
1206 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1207 struct sm501_platdata *pdata)
1208 {
1209 struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1210 int index;
1211 int ret;
1212
1213 for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1214 ret = sm501_register_gpio_i2c_instance(sm, iic);
1215 if (ret < 0)
1216 return ret;
1217 }
1218
1219 return 0;
1220 }
1221
1222 /* sm501_dbg_regs
1223 *
1224 * Debug attribute to attach to parent device to show core registers
1225 */
1226
1227 static ssize_t sm501_dbg_regs(struct device *dev,
1228 struct device_attribute *attr, char *buff)
1229 {
1230 struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1231 unsigned int reg;
1232 char *ptr = buff;
1233 int ret;
1234
1235 for (reg = 0x00; reg < 0x70; reg += 4) {
1236 ret = sprintf(ptr, "%08x = %08x\n",
1237 reg, readl(sm->regs + reg));
1238 ptr += ret;
1239 }
1240
1241 return ptr - buff;
1242 }
1243
1244
1245 static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);
1246
1247 /* sm501_init_reg
1248 *
1249 * Helper function for the init code to setup a register
1250 *
1251 * clear the bits which are set in r->mask, and then set
1252 * the bits set in r->set.
1253 */
1254
1255 static inline void sm501_init_reg(struct sm501_devdata *sm,
1256 unsigned long reg,
1257 struct sm501_reg_init *r)
1258 {
1259 unsigned long tmp;
1260
1261 tmp = readl(sm->regs + reg);
1262 tmp &= ~r->mask;
1263 tmp |= r->set;
1264 writel(tmp, sm->regs + reg);
1265 }
1266
1267 /* sm501_init_regs
1268 *
1269 * Setup core register values
1270 */
1271
1272 static void sm501_init_regs(struct sm501_devdata *sm,
1273 struct sm501_initdata *init)
1274 {
1275 sm501_misc_control(sm->dev,
1276 init->misc_control.set,
1277 init->misc_control.mask);
1278
1279 sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1280 sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1281 sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1282
1283 if (init->m1xclk) {
1284 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1285 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1286 }
1287
1288 if (init->mclk) {
1289 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1290 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1291 }
1292
1293 }
1294
1295 /* Check the PLL sources for the M1CLK and M1XCLK
1296 *
1297 * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1298 * there is a risk (see errata AB-5) that the SM501 will cease proper
1299 * function. If this happens, then it is likely the SM501 will
1300 * hang the system.
1301 */
1302
1303 static int sm501_check_clocks(struct sm501_devdata *sm)
1304 {
1305 unsigned long pwrmode = readl(sm->regs + SM501_CURRENT_CLOCK);
1306 unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1307 unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1308
1309 return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1310 }
1311
1312 static unsigned int sm501_mem_local[] = {
1313 [0] = 4*1024*1024,
1314 [1] = 8*1024*1024,
1315 [2] = 16*1024*1024,
1316 [3] = 32*1024*1024,
1317 [4] = 64*1024*1024,
1318 [5] = 2*1024*1024,
1319 };
1320
1321 /* sm501_init_dev
1322 *
1323 * Common init code for an SM501
1324 */
1325
1326 static int __devinit sm501_init_dev(struct sm501_devdata *sm)
1327 {
1328 struct sm501_initdata *idata;
1329 struct sm501_platdata *pdata;
1330 resource_size_t mem_avail;
1331 unsigned long dramctrl;
1332 unsigned long devid;
1333 int ret;
1334
1335 mutex_init(&sm->clock_lock);
1336 spin_lock_init(&sm->reg_lock);
1337
1338 INIT_LIST_HEAD(&sm->devices);
1339
1340 devid = readl(sm->regs + SM501_DEVICEID);
1341
1342 if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1343 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1344 return -EINVAL;
1345 }
1346
1347 /* disable irqs */
1348 writel(0, sm->regs + SM501_IRQ_MASK);
1349
1350 dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
1351 mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1352
1353 dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1354 sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1355
1356 sm->rev = devid & SM501_DEVICEID_REVMASK;
1357
1358 sm501_dump_gate(sm);
1359
1360 ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1361 if (ret)
1362 dev_err(sm->dev, "failed to create debug regs file\n");
1363
1364 sm501_dump_clk(sm);
1365
1366 /* check to see if we have some device initialisation */
1367
1368 pdata = sm->platdata;
1369 idata = pdata ? pdata->init : NULL;
1370
1371 if (idata) {
1372 sm501_init_regs(sm, idata);
1373
1374 if (idata->devices & SM501_USE_USB_HOST)
1375 sm501_register_usbhost(sm, &mem_avail);
1376 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1377 sm501_register_uart(sm, idata->devices);
1378 if (idata->devices & SM501_USE_GPIO)
1379 sm501_register_gpio(sm);
1380 }
1381
1382 if (pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1383 if (!sm501_gpio_isregistered(sm))
1384 dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1385 else
1386 sm501_register_gpio_i2c(sm, pdata);
1387 }
1388
1389 ret = sm501_check_clocks(sm);
1390 if (ret) {
1391 dev_err(sm->dev, "M1X and M clocks sourced from different "
1392 "PLLs\n");
1393 return -EINVAL;
1394 }
1395
1396 /* always create a framebuffer */
1397 sm501_register_display(sm, &mem_avail);
1398
1399 return 0;
1400 }
1401
1402 static int __devinit sm501_plat_probe(struct platform_device *dev)
1403 {
1404 struct sm501_devdata *sm;
1405 int ret;
1406
1407 sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1408 if (sm == NULL) {
1409 dev_err(&dev->dev, "no memory for device data\n");
1410 ret = -ENOMEM;
1411 goto err1;
1412 }
1413
1414 sm->dev = &dev->dev;
1415 sm->pdev_id = dev->id;
1416 sm->platdata = dev->dev.platform_data;
1417
1418 ret = platform_get_irq(dev, 0);
1419 if (ret < 0) {
1420 dev_err(&dev->dev, "failed to get irq resource\n");
1421 goto err_res;
1422 }
1423 sm->irq = ret;
1424
1425 sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1426 sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1427 if (sm->io_res == NULL || sm->mem_res == NULL) {
1428 dev_err(&dev->dev, "failed to get IO resource\n");
1429 ret = -ENOENT;
1430 goto err_res;
1431 }
1432
1433 sm->regs_claim = request_mem_region(sm->io_res->start,
1434 0x100, "sm501");
1435
1436 if (sm->regs_claim == NULL) {
1437 dev_err(&dev->dev, "cannot claim registers\n");
1438 ret = -EBUSY;
1439 goto err_res;
1440 }
1441
1442 platform_set_drvdata(dev, sm);
1443
1444 sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
1445
1446 if (sm->regs == NULL) {
1447 dev_err(&dev->dev, "cannot remap registers\n");
1448 ret = -EIO;
1449 goto err_claim;
1450 }
1451
1452 return sm501_init_dev(sm);
1453
1454 err_claim:
1455 release_resource(sm->regs_claim);
1456 kfree(sm->regs_claim);
1457 err_res:
1458 kfree(sm);
1459 err1:
1460 return ret;
1461
1462 }
1463
1464 #ifdef CONFIG_PM
1465
1466 /* power management support */
1467
1468 static void sm501_set_power(struct sm501_devdata *sm, int on)
1469 {
1470 struct sm501_platdata *pd = sm->platdata;
1471
1472 if (pd == NULL)
1473 return;
1474
1475 if (pd->get_power) {
1476 if (pd->get_power(sm->dev) == on) {
1477 dev_dbg(sm->dev, "is already %d\n", on);
1478 return;
1479 }
1480 }
1481
1482 if (pd->set_power) {
1483 dev_dbg(sm->dev, "setting power to %d\n", on);
1484
1485 pd->set_power(sm->dev, on);
1486 sm501_mdelay(sm, 10);
1487 }
1488 }
1489
1490 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1491 {
1492 struct sm501_devdata *sm = platform_get_drvdata(pdev);
1493
1494 sm->in_suspend = 1;
1495 sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);
1496
1497 sm501_dump_regs(sm);
1498
1499 if (sm->platdata) {
1500 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1501 sm501_set_power(sm, 0);
1502 }
1503
1504 return 0;
1505 }
1506
1507 static int sm501_plat_resume(struct platform_device *pdev)
1508 {
1509 struct sm501_devdata *sm = platform_get_drvdata(pdev);
1510
1511 sm501_set_power(sm, 1);
1512
1513 sm501_dump_regs(sm);
1514 sm501_dump_gate(sm);
1515 sm501_dump_clk(sm);
1516
1517 /* check to see if we are in the same state as when suspended */
1518
1519 if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1520 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1521 writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1522
1523 /* our suspend causes the controller state to change,
1524 * either by something attempting setup, power loss,
1525 * or an external reset event on power change */
1526
1527 if (sm->platdata && sm->platdata->init) {
1528 sm501_init_regs(sm, sm->platdata->init);
1529 }
1530 }
1531
1532 /* dump our state from resume */
1533
1534 sm501_dump_regs(sm);
1535 sm501_dump_clk(sm);
1536
1537 sm->in_suspend = 0;
1538
1539 return 0;
1540 }
1541 #else
1542 #define sm501_plat_suspend NULL
1543 #define sm501_plat_resume NULL
1544 #endif
1545
1546 /* Initialisation data for PCI devices */
1547
1548 static struct sm501_initdata sm501_pci_initdata = {
1549 .gpio_high = {
1550 .set = 0x3F000000, /* 24bit panel */
1551 .mask = 0x0,
1552 },
1553 .misc_timing = {
1554 .set = 0x010100, /* SDRAM timing */
1555 .mask = 0x1F1F00,
1556 },
1557 .misc_control = {
1558 .set = SM501_MISC_PNL_24BIT,
1559 .mask = 0,
1560 },
1561
1562 .devices = SM501_USE_ALL,
1563
1564 /* Errata AB-3 says that 72MHz is the fastest available
1565 * for 33MHZ PCI with proper bus-mastering operation */
1566
1567 .mclk = 72 * MHZ,
1568 .m1xclk = 144 * MHZ,
1569 };
1570
1571 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1572 .flags = (SM501FB_FLAG_USE_INIT_MODE |
1573 SM501FB_FLAG_USE_HWCURSOR |
1574 SM501FB_FLAG_USE_HWACCEL |
1575 SM501FB_FLAG_DISABLE_AT_EXIT),
1576 };
1577
1578 static struct sm501_platdata_fb sm501_fb_pdata = {
1579 .fb_route = SM501_FB_OWN,
1580 .fb_crt = &sm501_pdata_fbsub,
1581 .fb_pnl = &sm501_pdata_fbsub,
1582 };
1583
1584 static struct sm501_platdata sm501_pci_platdata = {
1585 .init = &sm501_pci_initdata,
1586 .fb = &sm501_fb_pdata,
1587 .gpio_base = -1,
1588 };
1589
1590 static int __devinit sm501_pci_probe(struct pci_dev *dev,
1591 const struct pci_device_id *id)
1592 {
1593 struct sm501_devdata *sm;
1594 int err;
1595
1596 sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1597 if (sm == NULL) {
1598 dev_err(&dev->dev, "no memory for device data\n");
1599 err = -ENOMEM;
1600 goto err1;
1601 }
1602
1603 /* set a default set of platform data */
1604 dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1605
1606 /* set a hopefully unique id for our child platform devices */
1607 sm->pdev_id = 32 + dev->devfn;
1608
1609 pci_set_drvdata(dev, sm);
1610
1611 err = pci_enable_device(dev);
1612 if (err) {
1613 dev_err(&dev->dev, "cannot enable device\n");
1614 goto err2;
1615 }
1616
1617 sm->dev = &dev->dev;
1618 sm->irq = dev->irq;
1619
1620 #ifdef __BIG_ENDIAN
1621 /* if the system is big-endian, we most probably have a
1622 * translation in the IO layer making the PCI bus little endian
1623 * so make the framebuffer swapped pixels */
1624
1625 sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1626 #endif
1627
1628 /* check our resources */
1629
1630 if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1631 dev_err(&dev->dev, "region #0 is not memory?\n");
1632 err = -EINVAL;
1633 goto err3;
1634 }
1635
1636 if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1637 dev_err(&dev->dev, "region #1 is not memory?\n");
1638 err = -EINVAL;
1639 goto err3;
1640 }
1641
1642 /* make our resources ready for sharing */
1643
1644 sm->io_res = &dev->resource[1];
1645 sm->mem_res = &dev->resource[0];
1646
1647 sm->regs_claim = request_mem_region(sm->io_res->start,
1648 0x100, "sm501");
1649 if (sm->regs_claim == NULL) {
1650 dev_err(&dev->dev, "cannot claim registers\n");
1651 err= -EBUSY;
1652 goto err3;
1653 }
1654
1655 sm->regs = pci_ioremap_bar(dev, 1);
1656
1657 if (sm->regs == NULL) {
1658 dev_err(&dev->dev, "cannot remap registers\n");
1659 err = -EIO;
1660 goto err4;
1661 }
1662
1663 sm501_init_dev(sm);
1664 return 0;
1665
1666 err4:
1667 release_resource(sm->regs_claim);
1668 kfree(sm->regs_claim);
1669 err3:
1670 pci_disable_device(dev);
1671 err2:
1672 pci_set_drvdata(dev, NULL);
1673 kfree(sm);
1674 err1:
1675 return err;
1676 }
1677
1678 static void sm501_remove_sub(struct sm501_devdata *sm,
1679 struct sm501_device *smdev)
1680 {
1681 list_del(&smdev->list);
1682 platform_device_unregister(&smdev->pdev);
1683 }
1684
1685 static void sm501_dev_remove(struct sm501_devdata *sm)
1686 {
1687 struct sm501_device *smdev, *tmp;
1688
1689 list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1690 sm501_remove_sub(sm, smdev);
1691
1692 device_remove_file(sm->dev, &dev_attr_dbg_regs);
1693
1694 sm501_gpio_remove(sm);
1695 }
1696
1697 static void __devexit sm501_pci_remove(struct pci_dev *dev)
1698 {
1699 struct sm501_devdata *sm = pci_get_drvdata(dev);
1700
1701 sm501_dev_remove(sm);
1702 iounmap(sm->regs);
1703
1704 release_resource(sm->regs_claim);
1705 kfree(sm->regs_claim);
1706
1707 pci_set_drvdata(dev, NULL);
1708 pci_disable_device(dev);
1709 }
1710
1711 static int sm501_plat_remove(struct platform_device *dev)
1712 {
1713 struct sm501_devdata *sm = platform_get_drvdata(dev);
1714
1715 sm501_dev_remove(sm);
1716 iounmap(sm->regs);
1717
1718 release_resource(sm->regs_claim);
1719 kfree(sm->regs_claim);
1720
1721 return 0;
1722 }
1723
1724 static struct pci_device_id sm501_pci_tbl[] = {
1725 { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1726 { 0, },
1727 };
1728
1729 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1730
1731 static struct pci_driver sm501_pci_driver = {
1732 .name = "sm501",
1733 .id_table = sm501_pci_tbl,
1734 .probe = sm501_pci_probe,
1735 .remove = __devexit_p(sm501_pci_remove),
1736 };
1737
1738 MODULE_ALIAS("platform:sm501");
1739
1740 static struct platform_driver sm501_plat_driver = {
1741 .driver = {
1742 .name = "sm501",
1743 .owner = THIS_MODULE,
1744 },
1745 .probe = sm501_plat_probe,
1746 .remove = sm501_plat_remove,
1747 .suspend = sm501_plat_suspend,
1748 .resume = sm501_plat_resume,
1749 };
1750
1751 static int __init sm501_base_init(void)
1752 {
1753 platform_driver_register(&sm501_plat_driver);
1754 return pci_register_driver(&sm501_pci_driver);
1755 }
1756
1757 static void __exit sm501_base_exit(void)
1758 {
1759 platform_driver_unregister(&sm501_plat_driver);
1760 pci_unregister_driver(&sm501_pci_driver);
1761 }
1762
1763 module_init(sm501_base_init);
1764 module_exit(sm501_base_exit);
1765
1766 MODULE_DESCRIPTION("SM501 Core Driver");
1767 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1768 MODULE_LICENSE("GPL v2");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree