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[mirror_ubuntu-jammy-kernel.git] / drivers / mfd / sm501.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* linux/drivers/mfd/sm501.c
3 *
4 * Copyright (C) 2006 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * Vincent Sanders <vince@simtec.co.uk>
7 *
8 * SM501 MFD driver
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/list.h>
16 #include <linux/device.h>
17 #include <linux/platform_device.h>
18 #include <linux/pci.h>
19 #include <linux/platform_data/i2c-gpio.h>
20 #include <linux/gpio/driver.h>
21 #include <linux/gpio/machine.h>
22 #include <linux/slab.h>
23
24 #include <linux/sm501.h>
25 #include <linux/sm501-regs.h>
26 #include <linux/serial_8250.h>
27
28 #include <linux/io.h>
29
30 struct sm501_device {
31 struct list_head list;
32 struct platform_device pdev;
33 };
34
35 struct sm501_gpio;
36
37 #ifdef CONFIG_MFD_SM501_GPIO
38 #include <linux/gpio.h>
39
40 struct sm501_gpio_chip {
41 struct gpio_chip gpio;
42 struct sm501_gpio *ourgpio; /* to get back to parent. */
43 void __iomem *regbase;
44 void __iomem *control; /* address of control reg. */
45 };
46
47 struct sm501_gpio {
48 struct sm501_gpio_chip low;
49 struct sm501_gpio_chip high;
50 spinlock_t lock;
51
52 unsigned int registered : 1;
53 void __iomem *regs;
54 struct resource *regs_res;
55 };
56 #else
57 struct sm501_gpio {
58 /* no gpio support, empty definition for sm501_devdata. */
59 };
60 #endif
61
62 struct sm501_devdata {
63 spinlock_t reg_lock;
64 struct mutex clock_lock;
65 struct list_head devices;
66 struct sm501_gpio gpio;
67
68 struct device *dev;
69 struct resource *io_res;
70 struct resource *mem_res;
71 struct resource *regs_claim;
72 struct sm501_platdata *platdata;
73
74
75 unsigned int in_suspend;
76 unsigned long pm_misc;
77
78 int unit_power[20];
79 unsigned int pdev_id;
80 unsigned int irq;
81 void __iomem *regs;
82 unsigned int rev;
83 };
84
85
86 #define MHZ (1000 * 1000)
87
88 #ifdef DEBUG
89 static const unsigned int div_tab[] = {
90 [0] = 1,
91 [1] = 2,
92 [2] = 4,
93 [3] = 8,
94 [4] = 16,
95 [5] = 32,
96 [6] = 64,
97 [7] = 128,
98 [8] = 3,
99 [9] = 6,
100 [10] = 12,
101 [11] = 24,
102 [12] = 48,
103 [13] = 96,
104 [14] = 192,
105 [15] = 384,
106 [16] = 5,
107 [17] = 10,
108 [18] = 20,
109 [19] = 40,
110 [20] = 80,
111 [21] = 160,
112 [22] = 320,
113 [23] = 604,
114 };
115
116 static unsigned long decode_div(unsigned long pll2, unsigned long val,
117 unsigned int lshft, unsigned int selbit,
118 unsigned long mask)
119 {
120 if (val & selbit)
121 pll2 = 288 * MHZ;
122
123 return pll2 / div_tab[(val >> lshft) & mask];
124 }
125
126 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
127
128 /* sm501_dump_clk
129 *
130 * Print out the current clock configuration for the device
131 */
132
133 static void sm501_dump_clk(struct sm501_devdata *sm)
134 {
135 unsigned long misct = smc501_readl(sm->regs + SM501_MISC_TIMING);
136 unsigned long pm0 = smc501_readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
137 unsigned long pm1 = smc501_readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
138 unsigned long pmc = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
139 unsigned long sdclk0, sdclk1;
140 unsigned long pll2 = 0;
141
142 switch (misct & 0x30) {
143 case 0x00:
144 pll2 = 336 * MHZ;
145 break;
146 case 0x10:
147 pll2 = 288 * MHZ;
148 break;
149 case 0x20:
150 pll2 = 240 * MHZ;
151 break;
152 case 0x30:
153 pll2 = 192 * MHZ;
154 break;
155 }
156
157 sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
158 sdclk0 /= div_tab[((misct >> 8) & 0xf)];
159
160 sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
161 sdclk1 /= div_tab[((misct >> 16) & 0xf)];
162
163 dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
164 misct, pm0, pm1);
165
166 dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
167 fmt_freq(pll2), sdclk0, sdclk1);
168
169 dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
170
171 dev_dbg(sm->dev, "PM0[%c]: "
172 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
173 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
174 (pmc & 3 ) == 0 ? '*' : '-',
175 fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
176 fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
177 fmt_freq(decode_div(pll2, pm0, 8, 1<<12, 15)),
178 fmt_freq(decode_div(pll2, pm0, 0, 1<<4, 15)));
179
180 dev_dbg(sm->dev, "PM1[%c]: "
181 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
182 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
183 (pmc & 3 ) == 1 ? '*' : '-',
184 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
185 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
186 fmt_freq(decode_div(pll2, pm1, 8, 1<<12, 15)),
187 fmt_freq(decode_div(pll2, pm1, 0, 1<<4, 15)));
188 }
189
190 static void sm501_dump_regs(struct sm501_devdata *sm)
191 {
192 void __iomem *regs = sm->regs;
193
194 dev_info(sm->dev, "System Control %08x\n",
195 smc501_readl(regs + SM501_SYSTEM_CONTROL));
196 dev_info(sm->dev, "Misc Control %08x\n",
197 smc501_readl(regs + SM501_MISC_CONTROL));
198 dev_info(sm->dev, "GPIO Control Low %08x\n",
199 smc501_readl(regs + SM501_GPIO31_0_CONTROL));
200 dev_info(sm->dev, "GPIO Control Hi %08x\n",
201 smc501_readl(regs + SM501_GPIO63_32_CONTROL));
202 dev_info(sm->dev, "DRAM Control %08x\n",
203 smc501_readl(regs + SM501_DRAM_CONTROL));
204 dev_info(sm->dev, "Arbitration Ctrl %08x\n",
205 smc501_readl(regs + SM501_ARBTRTN_CONTROL));
206 dev_info(sm->dev, "Misc Timing %08x\n",
207 smc501_readl(regs + SM501_MISC_TIMING));
208 }
209
210 static void sm501_dump_gate(struct sm501_devdata *sm)
211 {
212 dev_info(sm->dev, "CurrentGate %08x\n",
213 smc501_readl(sm->regs + SM501_CURRENT_GATE));
214 dev_info(sm->dev, "CurrentClock %08x\n",
215 smc501_readl(sm->regs + SM501_CURRENT_CLOCK));
216 dev_info(sm->dev, "PowerModeControl %08x\n",
217 smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL));
218 }
219
220 #else
221 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
222 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
223 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
224 #endif
225
226 /* sm501_sync_regs
227 *
228 * ensure the
229 */
230
231 static void sm501_sync_regs(struct sm501_devdata *sm)
232 {
233 smc501_readl(sm->regs);
234 }
235
236 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
237 {
238 /* during suspend/resume, we are currently not allowed to sleep,
239 * so change to using mdelay() instead of msleep() if we
240 * are in one of these paths */
241
242 if (sm->in_suspend)
243 mdelay(delay);
244 else
245 msleep(delay);
246 }
247
248 /* sm501_misc_control
249 *
250 * alters the miscellaneous control parameters
251 */
252
253 int sm501_misc_control(struct device *dev,
254 unsigned long set, unsigned long clear)
255 {
256 struct sm501_devdata *sm = dev_get_drvdata(dev);
257 unsigned long misc;
258 unsigned long save;
259 unsigned long to;
260
261 spin_lock_irqsave(&sm->reg_lock, save);
262
263 misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
264 to = (misc & ~clear) | set;
265
266 if (to != misc) {
267 smc501_writel(to, sm->regs + SM501_MISC_CONTROL);
268 sm501_sync_regs(sm);
269
270 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
271 }
272
273 spin_unlock_irqrestore(&sm->reg_lock, save);
274 return to;
275 }
276
277 EXPORT_SYMBOL_GPL(sm501_misc_control);
278
279 /* sm501_modify_reg
280 *
281 * Modify a register in the SM501 which may be shared with other
282 * drivers.
283 */
284
285 unsigned long sm501_modify_reg(struct device *dev,
286 unsigned long reg,
287 unsigned long set,
288 unsigned long clear)
289 {
290 struct sm501_devdata *sm = dev_get_drvdata(dev);
291 unsigned long data;
292 unsigned long save;
293
294 spin_lock_irqsave(&sm->reg_lock, save);
295
296 data = smc501_readl(sm->regs + reg);
297 data |= set;
298 data &= ~clear;
299
300 smc501_writel(data, sm->regs + reg);
301 sm501_sync_regs(sm);
302
303 spin_unlock_irqrestore(&sm->reg_lock, save);
304
305 return data;
306 }
307
308 EXPORT_SYMBOL_GPL(sm501_modify_reg);
309
310 /* sm501_unit_power
311 *
312 * alters the power active gate to set specific units on or off
313 */
314
315 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
316 {
317 struct sm501_devdata *sm = dev_get_drvdata(dev);
318 unsigned long mode;
319 unsigned long gate;
320 unsigned long clock;
321
322 mutex_lock(&sm->clock_lock);
323
324 mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
325 gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
326 clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
327
328 mode &= 3; /* get current power mode */
329
330 if (unit >= ARRAY_SIZE(sm->unit_power)) {
331 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
332 goto already;
333 }
334
335 dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
336 sm->unit_power[unit], to);
337
338 if (to == 0 && sm->unit_power[unit] == 0) {
339 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
340 goto already;
341 }
342
343 sm->unit_power[unit] += to ? 1 : -1;
344 to = sm->unit_power[unit] ? 1 : 0;
345
346 if (to) {
347 if (gate & (1 << unit))
348 goto already;
349 gate |= (1 << unit);
350 } else {
351 if (!(gate & (1 << unit)))
352 goto already;
353 gate &= ~(1 << unit);
354 }
355
356 switch (mode) {
357 case 1:
358 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
359 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
360 mode = 0;
361 break;
362 case 2:
363 case 0:
364 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
365 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
366 mode = 1;
367 break;
368
369 default:
370 gate = -1;
371 goto already;
372 }
373
374 smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
375 sm501_sync_regs(sm);
376
377 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
378 gate, clock, mode);
379
380 sm501_mdelay(sm, 16);
381
382 already:
383 mutex_unlock(&sm->clock_lock);
384 return gate;
385 }
386
387 EXPORT_SYMBOL_GPL(sm501_unit_power);
388
389 /* clock value structure. */
390 struct sm501_clock {
391 unsigned long mclk;
392 int divider;
393 int shift;
394 unsigned int m, n, k;
395 };
396
397 /* sm501_calc_clock
398 *
399 * Calculates the nearest discrete clock frequency that
400 * can be achieved with the specified input clock.
401 * the maximum divisor is 3 or 5
402 */
403
404 static int sm501_calc_clock(unsigned long freq,
405 struct sm501_clock *clock,
406 int max_div,
407 unsigned long mclk,
408 long *best_diff)
409 {
410 int ret = 0;
411 int divider;
412 int shift;
413 long diff;
414
415 /* try dividers 1 and 3 for CRT and for panel,
416 try divider 5 for panel only.*/
417
418 for (divider = 1; divider <= max_div; divider += 2) {
419 /* try all 8 shift values.*/
420 for (shift = 0; shift < 8; shift++) {
421 /* Calculate difference to requested clock */
422 diff = DIV_ROUND_CLOSEST(mclk, divider << shift) - freq;
423 if (diff < 0)
424 diff = -diff;
425
426 /* If it is less than the current, use it */
427 if (diff < *best_diff) {
428 *best_diff = diff;
429
430 clock->mclk = mclk;
431 clock->divider = divider;
432 clock->shift = shift;
433 ret = 1;
434 }
435 }
436 }
437
438 return ret;
439 }
440
441 /* sm501_calc_pll
442 *
443 * Calculates the nearest discrete clock frequency that can be
444 * achieved using the programmable PLL.
445 * the maximum divisor is 3 or 5
446 */
447
448 static unsigned long sm501_calc_pll(unsigned long freq,
449 struct sm501_clock *clock,
450 int max_div)
451 {
452 unsigned long mclk;
453 unsigned int m, n, k;
454 long best_diff = 999999999;
455
456 /*
457 * The SM502 datasheet doesn't specify the min/max values for M and N.
458 * N = 1 at least doesn't work in practice.
459 */
460 for (m = 2; m <= 255; m++) {
461 for (n = 2; n <= 127; n++) {
462 for (k = 0; k <= 1; k++) {
463 mclk = (24000000UL * m / n) >> k;
464
465 if (sm501_calc_clock(freq, clock, max_div,
466 mclk, &best_diff)) {
467 clock->m = m;
468 clock->n = n;
469 clock->k = k;
470 }
471 }
472 }
473 }
474
475 /* Return best clock. */
476 return clock->mclk / (clock->divider << clock->shift);
477 }
478
479 /* sm501_select_clock
480 *
481 * Calculates the nearest discrete clock frequency that can be
482 * achieved using the 288MHz and 336MHz PLLs.
483 * the maximum divisor is 3 or 5
484 */
485
486 static unsigned long sm501_select_clock(unsigned long freq,
487 struct sm501_clock *clock,
488 int max_div)
489 {
490 unsigned long mclk;
491 long best_diff = 999999999;
492
493 /* Try 288MHz and 336MHz clocks. */
494 for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
495 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
496 }
497
498 /* Return best clock. */
499 return clock->mclk / (clock->divider << clock->shift);
500 }
501
502 /* sm501_set_clock
503 *
504 * set one of the four clock sources to the closest available frequency to
505 * the one specified
506 */
507
508 unsigned long sm501_set_clock(struct device *dev,
509 int clksrc,
510 unsigned long req_freq)
511 {
512 struct sm501_devdata *sm = dev_get_drvdata(dev);
513 unsigned long mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
514 unsigned long gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
515 unsigned long clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
516 unsigned int pll_reg = 0;
517 unsigned long sm501_freq; /* the actual frequency achieved */
518 u64 reg;
519
520 struct sm501_clock to;
521
522 /* find achivable discrete frequency and setup register value
523 * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
524 * has an extra bit for the divider */
525
526 switch (clksrc) {
527 case SM501_CLOCK_P2XCLK:
528 /* This clock is divided in half so to achieve the
529 * requested frequency the value must be multiplied by
530 * 2. This clock also has an additional pre divisor */
531
532 if (sm->rev >= 0xC0) {
533 /* SM502 -> use the programmable PLL */
534 sm501_freq = (sm501_calc_pll(2 * req_freq,
535 &to, 5) / 2);
536 reg = to.shift & 0x07;/* bottom 3 bits are shift */
537 if (to.divider == 3)
538 reg |= 0x08; /* /3 divider required */
539 else if (to.divider == 5)
540 reg |= 0x10; /* /5 divider required */
541 reg |= 0x40; /* select the programmable PLL */
542 pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
543 } else {
544 sm501_freq = (sm501_select_clock(2 * req_freq,
545 &to, 5) / 2);
546 reg = to.shift & 0x07;/* bottom 3 bits are shift */
547 if (to.divider == 3)
548 reg |= 0x08; /* /3 divider required */
549 else if (to.divider == 5)
550 reg |= 0x10; /* /5 divider required */
551 if (to.mclk != 288000000)
552 reg |= 0x20; /* which mclk pll is source */
553 }
554 break;
555
556 case SM501_CLOCK_V2XCLK:
557 /* This clock is divided in half so to achieve the
558 * requested frequency the value must be multiplied by 2. */
559
560 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
561 reg=to.shift & 0x07; /* bottom 3 bits are shift */
562 if (to.divider == 3)
563 reg |= 0x08; /* /3 divider required */
564 if (to.mclk != 288000000)
565 reg |= 0x10; /* which mclk pll is source */
566 break;
567
568 case SM501_CLOCK_MCLK:
569 case SM501_CLOCK_M1XCLK:
570 /* These clocks are the same and not further divided */
571
572 sm501_freq = sm501_select_clock( req_freq, &to, 3);
573 reg=to.shift & 0x07; /* bottom 3 bits are shift */
574 if (to.divider == 3)
575 reg |= 0x08; /* /3 divider required */
576 if (to.mclk != 288000000)
577 reg |= 0x10; /* which mclk pll is source */
578 break;
579
580 default:
581 return 0; /* this is bad */
582 }
583
584 mutex_lock(&sm->clock_lock);
585
586 mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
587 gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
588 clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
589
590 clock = clock & ~(0xFF << clksrc);
591 clock |= reg<<clksrc;
592
593 mode &= 3; /* find current mode */
594
595 switch (mode) {
596 case 1:
597 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
598 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
599 mode = 0;
600 break;
601 case 2:
602 case 0:
603 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
604 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
605 mode = 1;
606 break;
607
608 default:
609 mutex_unlock(&sm->clock_lock);
610 return -1;
611 }
612
613 smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
614
615 if (pll_reg)
616 smc501_writel(pll_reg,
617 sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
618
619 sm501_sync_regs(sm);
620
621 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
622 gate, clock, mode);
623
624 sm501_mdelay(sm, 16);
625 mutex_unlock(&sm->clock_lock);
626
627 sm501_dump_clk(sm);
628
629 return sm501_freq;
630 }
631
632 EXPORT_SYMBOL_GPL(sm501_set_clock);
633
634 /* sm501_find_clock
635 *
636 * finds the closest available frequency for a given clock
637 */
638
639 unsigned long sm501_find_clock(struct device *dev,
640 int clksrc,
641 unsigned long req_freq)
642 {
643 struct sm501_devdata *sm = dev_get_drvdata(dev);
644 unsigned long sm501_freq; /* the frequency achieveable by the 501 */
645 struct sm501_clock to;
646
647 switch (clksrc) {
648 case SM501_CLOCK_P2XCLK:
649 if (sm->rev >= 0xC0) {
650 /* SM502 -> use the programmable PLL */
651 sm501_freq = (sm501_calc_pll(2 * req_freq,
652 &to, 5) / 2);
653 } else {
654 sm501_freq = (sm501_select_clock(2 * req_freq,
655 &to, 5) / 2);
656 }
657 break;
658
659 case SM501_CLOCK_V2XCLK:
660 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
661 break;
662
663 case SM501_CLOCK_MCLK:
664 case SM501_CLOCK_M1XCLK:
665 sm501_freq = sm501_select_clock(req_freq, &to, 3);
666 break;
667
668 default:
669 sm501_freq = 0; /* error */
670 }
671
672 return sm501_freq;
673 }
674
675 EXPORT_SYMBOL_GPL(sm501_find_clock);
676
677 static struct sm501_device *to_sm_device(struct platform_device *pdev)
678 {
679 return container_of(pdev, struct sm501_device, pdev);
680 }
681
682 /* sm501_device_release
683 *
684 * A release function for the platform devices we create to allow us to
685 * free any items we allocated
686 */
687
688 static void sm501_device_release(struct device *dev)
689 {
690 kfree(to_sm_device(to_platform_device(dev)));
691 }
692
693 /* sm501_create_subdev
694 *
695 * Create a skeleton platform device with resources for passing to a
696 * sub-driver
697 */
698
699 static struct platform_device *
700 sm501_create_subdev(struct sm501_devdata *sm, char *name,
701 unsigned int res_count, unsigned int platform_data_size)
702 {
703 struct sm501_device *smdev;
704
705 smdev = kzalloc(sizeof(struct sm501_device) +
706 (sizeof(struct resource) * res_count) +
707 platform_data_size, GFP_KERNEL);
708 if (!smdev)
709 return NULL;
710
711 smdev->pdev.dev.release = sm501_device_release;
712
713 smdev->pdev.name = name;
714 smdev->pdev.id = sm->pdev_id;
715 smdev->pdev.dev.parent = sm->dev;
716 smdev->pdev.dev.coherent_dma_mask = 0xffffffff;
717
718 if (res_count) {
719 smdev->pdev.resource = (struct resource *)(smdev+1);
720 smdev->pdev.num_resources = res_count;
721 }
722 if (platform_data_size)
723 smdev->pdev.dev.platform_data = (void *)(smdev+1);
724
725 return &smdev->pdev;
726 }
727
728 /* sm501_register_device
729 *
730 * Register a platform device created with sm501_create_subdev()
731 */
732
733 static int sm501_register_device(struct sm501_devdata *sm,
734 struct platform_device *pdev)
735 {
736 struct sm501_device *smdev = to_sm_device(pdev);
737 int ptr;
738 int ret;
739
740 for (ptr = 0; ptr < pdev->num_resources; ptr++) {
741 printk(KERN_DEBUG "%s[%d] %pR\n",
742 pdev->name, ptr, &pdev->resource[ptr]);
743 }
744
745 ret = platform_device_register(pdev);
746
747 if (ret >= 0) {
748 dev_dbg(sm->dev, "registered %s\n", pdev->name);
749 list_add_tail(&smdev->list, &sm->devices);
750 } else
751 dev_err(sm->dev, "error registering %s (%d)\n",
752 pdev->name, ret);
753
754 return ret;
755 }
756
757 /* sm501_create_subio
758 *
759 * Fill in an IO resource for a sub device
760 */
761
762 static void sm501_create_subio(struct sm501_devdata *sm,
763 struct resource *res,
764 resource_size_t offs,
765 resource_size_t size)
766 {
767 res->flags = IORESOURCE_MEM;
768 res->parent = sm->io_res;
769 res->start = sm->io_res->start + offs;
770 res->end = res->start + size - 1;
771 }
772
773 /* sm501_create_mem
774 *
775 * Fill in an MEM resource for a sub device
776 */
777
778 static void sm501_create_mem(struct sm501_devdata *sm,
779 struct resource *res,
780 resource_size_t *offs,
781 resource_size_t size)
782 {
783 *offs -= size; /* adjust memory size */
784
785 res->flags = IORESOURCE_MEM;
786 res->parent = sm->mem_res;
787 res->start = sm->mem_res->start + *offs;
788 res->end = res->start + size - 1;
789 }
790
791 /* sm501_create_irq
792 *
793 * Fill in an IRQ resource for a sub device
794 */
795
796 static void sm501_create_irq(struct sm501_devdata *sm,
797 struct resource *res)
798 {
799 res->flags = IORESOURCE_IRQ;
800 res->parent = NULL;
801 res->start = res->end = sm->irq;
802 }
803
804 static int sm501_register_usbhost(struct sm501_devdata *sm,
805 resource_size_t *mem_avail)
806 {
807 struct platform_device *pdev;
808
809 pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
810 if (!pdev)
811 return -ENOMEM;
812
813 sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
814 sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
815 sm501_create_irq(sm, &pdev->resource[2]);
816
817 return sm501_register_device(sm, pdev);
818 }
819
820 static void sm501_setup_uart_data(struct sm501_devdata *sm,
821 struct plat_serial8250_port *uart_data,
822 unsigned int offset)
823 {
824 uart_data->membase = sm->regs + offset;
825 uart_data->mapbase = sm->io_res->start + offset;
826 uart_data->iotype = UPIO_MEM;
827 uart_data->irq = sm->irq;
828 uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
829 uart_data->regshift = 2;
830 uart_data->uartclk = (9600 * 16);
831 }
832
833 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
834 {
835 struct platform_device *pdev;
836 struct plat_serial8250_port *uart_data;
837
838 pdev = sm501_create_subdev(sm, "serial8250", 0,
839 sizeof(struct plat_serial8250_port) * 3);
840 if (!pdev)
841 return -ENOMEM;
842
843 uart_data = dev_get_platdata(&pdev->dev);
844
845 if (devices & SM501_USE_UART0) {
846 sm501_setup_uart_data(sm, uart_data++, 0x30000);
847 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
848 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
849 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
850 }
851 if (devices & SM501_USE_UART1) {
852 sm501_setup_uart_data(sm, uart_data++, 0x30020);
853 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
854 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
855 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
856 }
857
858 pdev->id = PLAT8250_DEV_SM501;
859
860 return sm501_register_device(sm, pdev);
861 }
862
863 static int sm501_register_display(struct sm501_devdata *sm,
864 resource_size_t *mem_avail)
865 {
866 struct platform_device *pdev;
867
868 pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
869 if (!pdev)
870 return -ENOMEM;
871
872 sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
873 sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
874 sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
875 sm501_create_irq(sm, &pdev->resource[3]);
876
877 return sm501_register_device(sm, pdev);
878 }
879
880 #ifdef CONFIG_MFD_SM501_GPIO
881
882 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
883 {
884 return container_of(gpio, struct sm501_devdata, gpio);
885 }
886
887 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
888
889 {
890 struct sm501_gpio_chip *smgpio = gpiochip_get_data(chip);
891 unsigned long result;
892
893 result = smc501_readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
894 result >>= offset;
895
896 return result & 1UL;
897 }
898
899 static void sm501_gpio_ensure_gpio(struct sm501_gpio_chip *smchip,
900 unsigned long bit)
901 {
902 unsigned long ctrl;
903
904 /* check and modify if this pin is not set as gpio. */
905
906 if (smc501_readl(smchip->control) & bit) {
907 dev_info(sm501_gpio_to_dev(smchip->ourgpio)->dev,
908 "changing mode of gpio, bit %08lx\n", bit);
909
910 ctrl = smc501_readl(smchip->control);
911 ctrl &= ~bit;
912 smc501_writel(ctrl, smchip->control);
913
914 sm501_sync_regs(sm501_gpio_to_dev(smchip->ourgpio));
915 }
916 }
917
918 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
919
920 {
921 struct sm501_gpio_chip *smchip = gpiochip_get_data(chip);
922 struct sm501_gpio *smgpio = smchip->ourgpio;
923 unsigned long bit = 1 << offset;
924 void __iomem *regs = smchip->regbase;
925 unsigned long save;
926 unsigned long val;
927
928 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
929 __func__, chip, offset);
930
931 spin_lock_irqsave(&smgpio->lock, save);
932
933 val = smc501_readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
934 if (value)
935 val |= bit;
936 smc501_writel(val, regs);
937
938 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
939 sm501_gpio_ensure_gpio(smchip, bit);
940
941 spin_unlock_irqrestore(&smgpio->lock, save);
942 }
943
944 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
945 {
946 struct sm501_gpio_chip *smchip = gpiochip_get_data(chip);
947 struct sm501_gpio *smgpio = smchip->ourgpio;
948 void __iomem *regs = smchip->regbase;
949 unsigned long bit = 1 << offset;
950 unsigned long save;
951 unsigned long ddr;
952
953 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
954 __func__, chip, offset);
955
956 spin_lock_irqsave(&smgpio->lock, save);
957
958 ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
959 smc501_writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
960
961 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
962 sm501_gpio_ensure_gpio(smchip, bit);
963
964 spin_unlock_irqrestore(&smgpio->lock, save);
965
966 return 0;
967 }
968
969 static int sm501_gpio_output(struct gpio_chip *chip,
970 unsigned offset, int value)
971 {
972 struct sm501_gpio_chip *smchip = gpiochip_get_data(chip);
973 struct sm501_gpio *smgpio = smchip->ourgpio;
974 unsigned long bit = 1 << offset;
975 void __iomem *regs = smchip->regbase;
976 unsigned long save;
977 unsigned long val;
978 unsigned long ddr;
979
980 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
981 __func__, chip, offset, value);
982
983 spin_lock_irqsave(&smgpio->lock, save);
984
985 val = smc501_readl(regs + SM501_GPIO_DATA_LOW);
986 if (value)
987 val |= bit;
988 else
989 val &= ~bit;
990 smc501_writel(val, regs);
991
992 ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
993 smc501_writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
994
995 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
996 smc501_writel(val, regs + SM501_GPIO_DATA_LOW);
997
998 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
999 spin_unlock_irqrestore(&smgpio->lock, save);
1000
1001 return 0;
1002 }
1003
1004 static const struct gpio_chip gpio_chip_template = {
1005 .ngpio = 32,
1006 .direction_input = sm501_gpio_input,
1007 .direction_output = sm501_gpio_output,
1008 .set = sm501_gpio_set,
1009 .get = sm501_gpio_get,
1010 };
1011
1012 static int sm501_gpio_register_chip(struct sm501_devdata *sm,
1013 struct sm501_gpio *gpio,
1014 struct sm501_gpio_chip *chip)
1015 {
1016 struct sm501_platdata *pdata = sm->platdata;
1017 struct gpio_chip *gchip = &chip->gpio;
1018 int base = pdata->gpio_base;
1019
1020 chip->gpio = gpio_chip_template;
1021
1022 if (chip == &gpio->high) {
1023 if (base > 0)
1024 base += 32;
1025 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1026 chip->control = sm->regs + SM501_GPIO63_32_CONTROL;
1027 gchip->label = "SM501-HIGH";
1028 } else {
1029 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1030 chip->control = sm->regs + SM501_GPIO31_0_CONTROL;
1031 gchip->label = "SM501-LOW";
1032 }
1033
1034 gchip->base = base;
1035 chip->ourgpio = gpio;
1036
1037 return gpiochip_add_data(gchip, chip);
1038 }
1039
1040 static int sm501_register_gpio(struct sm501_devdata *sm)
1041 {
1042 struct sm501_gpio *gpio = &sm->gpio;
1043 resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1044 int ret;
1045
1046 dev_dbg(sm->dev, "registering gpio block %08llx\n",
1047 (unsigned long long)iobase);
1048
1049 spin_lock_init(&gpio->lock);
1050
1051 gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1052 if (!gpio->regs_res) {
1053 dev_err(sm->dev, "gpio: failed to request region\n");
1054 return -ENXIO;
1055 }
1056
1057 gpio->regs = ioremap(iobase, 0x20);
1058 if (!gpio->regs) {
1059 dev_err(sm->dev, "gpio: failed to remap registers\n");
1060 ret = -ENXIO;
1061 goto err_claimed;
1062 }
1063
1064 /* Register both our chips. */
1065
1066 ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1067 if (ret) {
1068 dev_err(sm->dev, "failed to add low chip\n");
1069 goto err_mapped;
1070 }
1071
1072 ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1073 if (ret) {
1074 dev_err(sm->dev, "failed to add high chip\n");
1075 goto err_low_chip;
1076 }
1077
1078 gpio->registered = 1;
1079
1080 return 0;
1081
1082 err_low_chip:
1083 gpiochip_remove(&gpio->low.gpio);
1084
1085 err_mapped:
1086 iounmap(gpio->regs);
1087
1088 err_claimed:
1089 release_mem_region(iobase, 0x20);
1090
1091 return ret;
1092 }
1093
1094 static void sm501_gpio_remove(struct sm501_devdata *sm)
1095 {
1096 struct sm501_gpio *gpio = &sm->gpio;
1097 resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1098
1099 if (!sm->gpio.registered)
1100 return;
1101
1102 gpiochip_remove(&gpio->low.gpio);
1103 gpiochip_remove(&gpio->high.gpio);
1104
1105 iounmap(gpio->regs);
1106 release_mem_region(iobase, 0x20);
1107 }
1108
1109 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1110 {
1111 return sm->gpio.registered;
1112 }
1113 #else
1114 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1115 {
1116 return 0;
1117 }
1118
1119 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1120 {
1121 }
1122
1123 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1124 {
1125 return 0;
1126 }
1127 #endif
1128
1129 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1130 struct sm501_platdata_gpio_i2c *iic)
1131 {
1132 struct i2c_gpio_platform_data *icd;
1133 struct platform_device *pdev;
1134 struct gpiod_lookup_table *lookup;
1135
1136 pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1137 sizeof(struct i2c_gpio_platform_data));
1138 if (!pdev)
1139 return -ENOMEM;
1140
1141 /* Create a gpiod lookup using gpiochip-local offsets */
1142 lookup = devm_kzalloc(&pdev->dev, struct_size(lookup, table, 3),
1143 GFP_KERNEL);
1144 if (!lookup)
1145 return -ENOMEM;
1146
1147 lookup->dev_id = "i2c-gpio";
1148 lookup->table[0] = (struct gpiod_lookup)
1149 GPIO_LOOKUP_IDX(iic->pin_sda < 32 ? "SM501-LOW" : "SM501-HIGH",
1150 iic->pin_sda % 32, NULL, 0,
1151 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN);
1152 lookup->table[1] = (struct gpiod_lookup)
1153 GPIO_LOOKUP_IDX(iic->pin_scl < 32 ? "SM501-LOW" : "SM501-HIGH",
1154 iic->pin_scl % 32, NULL, 1,
1155 GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN);
1156 gpiod_add_lookup_table(lookup);
1157
1158 icd = dev_get_platdata(&pdev->dev);
1159 icd->timeout = iic->timeout;
1160 icd->udelay = iic->udelay;
1161
1162 /* note, we can't use either of the pin numbers, as the i2c-gpio
1163 * driver uses the platform.id field to generate the bus number
1164 * to register with the i2c core; The i2c core doesn't have enough
1165 * entries to deal with anything we currently use.
1166 */
1167
1168 pdev->id = iic->bus_num;
1169
1170 dev_info(sm->dev, "registering i2c-%d: sda=%d, scl=%d\n",
1171 iic->bus_num,
1172 iic->pin_sda, iic->pin_scl);
1173
1174 return sm501_register_device(sm, pdev);
1175 }
1176
1177 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1178 struct sm501_platdata *pdata)
1179 {
1180 struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1181 int index;
1182 int ret;
1183
1184 for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1185 ret = sm501_register_gpio_i2c_instance(sm, iic);
1186 if (ret < 0)
1187 return ret;
1188 }
1189
1190 return 0;
1191 }
1192
1193 /* dbg_regs_show
1194 *
1195 * Debug attribute to attach to parent device to show core registers
1196 */
1197
1198 static ssize_t dbg_regs_show(struct device *dev,
1199 struct device_attribute *attr, char *buff)
1200 {
1201 struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1202 unsigned int reg;
1203 char *ptr = buff;
1204 int ret;
1205
1206 for (reg = 0x00; reg < 0x70; reg += 4) {
1207 ret = sprintf(ptr, "%08x = %08x\n",
1208 reg, smc501_readl(sm->regs + reg));
1209 ptr += ret;
1210 }
1211
1212 return ptr - buff;
1213 }
1214
1215
1216 static DEVICE_ATTR_RO(dbg_regs);
1217
1218 /* sm501_init_reg
1219 *
1220 * Helper function for the init code to setup a register
1221 *
1222 * clear the bits which are set in r->mask, and then set
1223 * the bits set in r->set.
1224 */
1225
1226 static inline void sm501_init_reg(struct sm501_devdata *sm,
1227 unsigned long reg,
1228 struct sm501_reg_init *r)
1229 {
1230 unsigned long tmp;
1231
1232 tmp = smc501_readl(sm->regs + reg);
1233 tmp &= ~r->mask;
1234 tmp |= r->set;
1235 smc501_writel(tmp, sm->regs + reg);
1236 }
1237
1238 /* sm501_init_regs
1239 *
1240 * Setup core register values
1241 */
1242
1243 static void sm501_init_regs(struct sm501_devdata *sm,
1244 struct sm501_initdata *init)
1245 {
1246 sm501_misc_control(sm->dev,
1247 init->misc_control.set,
1248 init->misc_control.mask);
1249
1250 sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1251 sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1252 sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1253
1254 if (init->m1xclk) {
1255 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1256 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1257 }
1258
1259 if (init->mclk) {
1260 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1261 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1262 }
1263
1264 }
1265
1266 /* Check the PLL sources for the M1CLK and M1XCLK
1267 *
1268 * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1269 * there is a risk (see errata AB-5) that the SM501 will cease proper
1270 * function. If this happens, then it is likely the SM501 will
1271 * hang the system.
1272 */
1273
1274 static int sm501_check_clocks(struct sm501_devdata *sm)
1275 {
1276 unsigned long pwrmode = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
1277 unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1278 unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1279
1280 return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1281 }
1282
1283 static unsigned int sm501_mem_local[] = {
1284 [0] = 4*1024*1024,
1285 [1] = 8*1024*1024,
1286 [2] = 16*1024*1024,
1287 [3] = 32*1024*1024,
1288 [4] = 64*1024*1024,
1289 [5] = 2*1024*1024,
1290 };
1291
1292 /* sm501_init_dev
1293 *
1294 * Common init code for an SM501
1295 */
1296
1297 static int sm501_init_dev(struct sm501_devdata *sm)
1298 {
1299 struct sm501_initdata *idata;
1300 struct sm501_platdata *pdata;
1301 resource_size_t mem_avail;
1302 unsigned long dramctrl;
1303 unsigned long devid;
1304 int ret;
1305
1306 mutex_init(&sm->clock_lock);
1307 spin_lock_init(&sm->reg_lock);
1308
1309 INIT_LIST_HEAD(&sm->devices);
1310
1311 devid = smc501_readl(sm->regs + SM501_DEVICEID);
1312
1313 if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1314 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1315 return -EINVAL;
1316 }
1317
1318 /* disable irqs */
1319 smc501_writel(0, sm->regs + SM501_IRQ_MASK);
1320
1321 dramctrl = smc501_readl(sm->regs + SM501_DRAM_CONTROL);
1322 mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1323
1324 dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1325 sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1326
1327 sm->rev = devid & SM501_DEVICEID_REVMASK;
1328
1329 sm501_dump_gate(sm);
1330
1331 ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1332 if (ret)
1333 dev_err(sm->dev, "failed to create debug regs file\n");
1334
1335 sm501_dump_clk(sm);
1336
1337 /* check to see if we have some device initialisation */
1338
1339 pdata = sm->platdata;
1340 idata = pdata ? pdata->init : NULL;
1341
1342 if (idata) {
1343 sm501_init_regs(sm, idata);
1344
1345 if (idata->devices & SM501_USE_USB_HOST)
1346 sm501_register_usbhost(sm, &mem_avail);
1347 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1348 sm501_register_uart(sm, idata->devices);
1349 if (idata->devices & SM501_USE_GPIO)
1350 sm501_register_gpio(sm);
1351 }
1352
1353 if (pdata && pdata->gpio_i2c && pdata->gpio_i2c_nr > 0) {
1354 if (!sm501_gpio_isregistered(sm))
1355 dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1356 else
1357 sm501_register_gpio_i2c(sm, pdata);
1358 }
1359
1360 ret = sm501_check_clocks(sm);
1361 if (ret) {
1362 dev_err(sm->dev, "M1X and M clocks sourced from different "
1363 "PLLs\n");
1364 return -EINVAL;
1365 }
1366
1367 /* always create a framebuffer */
1368 sm501_register_display(sm, &mem_avail);
1369
1370 return 0;
1371 }
1372
1373 static int sm501_plat_probe(struct platform_device *dev)
1374 {
1375 struct sm501_devdata *sm;
1376 int ret;
1377
1378 sm = kzalloc(sizeof(*sm), GFP_KERNEL);
1379 if (!sm) {
1380 ret = -ENOMEM;
1381 goto err1;
1382 }
1383
1384 sm->dev = &dev->dev;
1385 sm->pdev_id = dev->id;
1386 sm->platdata = dev_get_platdata(&dev->dev);
1387
1388 ret = platform_get_irq(dev, 0);
1389 if (ret < 0)
1390 goto err_res;
1391 sm->irq = ret;
1392
1393 sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1394 sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1395 if (!sm->io_res || !sm->mem_res) {
1396 dev_err(&dev->dev, "failed to get IO resource\n");
1397 ret = -ENOENT;
1398 goto err_res;
1399 }
1400
1401 sm->regs_claim = request_mem_region(sm->io_res->start,
1402 0x100, "sm501");
1403 if (!sm->regs_claim) {
1404 dev_err(&dev->dev, "cannot claim registers\n");
1405 ret = -EBUSY;
1406 goto err_res;
1407 }
1408
1409 platform_set_drvdata(dev, sm);
1410
1411 sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
1412 if (!sm->regs) {
1413 dev_err(&dev->dev, "cannot remap registers\n");
1414 ret = -EIO;
1415 goto err_claim;
1416 }
1417
1418 ret = sm501_init_dev(sm);
1419 if (ret)
1420 goto err_unmap;
1421
1422 return 0;
1423
1424 err_unmap:
1425 iounmap(sm->regs);
1426 err_claim:
1427 release_mem_region(sm->io_res->start, 0x100);
1428 err_res:
1429 kfree(sm);
1430 err1:
1431 return ret;
1432
1433 }
1434
1435 #ifdef CONFIG_PM
1436
1437 /* power management support */
1438
1439 static void sm501_set_power(struct sm501_devdata *sm, int on)
1440 {
1441 struct sm501_platdata *pd = sm->platdata;
1442
1443 if (!pd)
1444 return;
1445
1446 if (pd->get_power) {
1447 if (pd->get_power(sm->dev) == on) {
1448 dev_dbg(sm->dev, "is already %d\n", on);
1449 return;
1450 }
1451 }
1452
1453 if (pd->set_power) {
1454 dev_dbg(sm->dev, "setting power to %d\n", on);
1455
1456 pd->set_power(sm->dev, on);
1457 sm501_mdelay(sm, 10);
1458 }
1459 }
1460
1461 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1462 {
1463 struct sm501_devdata *sm = platform_get_drvdata(pdev);
1464
1465 sm->in_suspend = 1;
1466 sm->pm_misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
1467
1468 sm501_dump_regs(sm);
1469
1470 if (sm->platdata) {
1471 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1472 sm501_set_power(sm, 0);
1473 }
1474
1475 return 0;
1476 }
1477
1478 static int sm501_plat_resume(struct platform_device *pdev)
1479 {
1480 struct sm501_devdata *sm = platform_get_drvdata(pdev);
1481
1482 sm501_set_power(sm, 1);
1483
1484 sm501_dump_regs(sm);
1485 sm501_dump_gate(sm);
1486 sm501_dump_clk(sm);
1487
1488 /* check to see if we are in the same state as when suspended */
1489
1490 if (smc501_readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1491 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1492 smc501_writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1493
1494 /* our suspend causes the controller state to change,
1495 * either by something attempting setup, power loss,
1496 * or an external reset event on power change */
1497
1498 if (sm->platdata && sm->platdata->init) {
1499 sm501_init_regs(sm, sm->platdata->init);
1500 }
1501 }
1502
1503 /* dump our state from resume */
1504
1505 sm501_dump_regs(sm);
1506 sm501_dump_clk(sm);
1507
1508 sm->in_suspend = 0;
1509
1510 return 0;
1511 }
1512 #else
1513 #define sm501_plat_suspend NULL
1514 #define sm501_plat_resume NULL
1515 #endif
1516
1517 /* Initialisation data for PCI devices */
1518
1519 static struct sm501_initdata sm501_pci_initdata = {
1520 .gpio_high = {
1521 .set = 0x3F000000, /* 24bit panel */
1522 .mask = 0x0,
1523 },
1524 .misc_timing = {
1525 .set = 0x010100, /* SDRAM timing */
1526 .mask = 0x1F1F00,
1527 },
1528 .misc_control = {
1529 .set = SM501_MISC_PNL_24BIT,
1530 .mask = 0,
1531 },
1532
1533 .devices = SM501_USE_ALL,
1534
1535 /* Errata AB-3 says that 72MHz is the fastest available
1536 * for 33MHZ PCI with proper bus-mastering operation */
1537
1538 .mclk = 72 * MHZ,
1539 .m1xclk = 144 * MHZ,
1540 };
1541
1542 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1543 .flags = (SM501FB_FLAG_USE_INIT_MODE |
1544 SM501FB_FLAG_USE_HWCURSOR |
1545 SM501FB_FLAG_USE_HWACCEL |
1546 SM501FB_FLAG_DISABLE_AT_EXIT),
1547 };
1548
1549 static struct sm501_platdata_fb sm501_fb_pdata = {
1550 .fb_route = SM501_FB_OWN,
1551 .fb_crt = &sm501_pdata_fbsub,
1552 .fb_pnl = &sm501_pdata_fbsub,
1553 };
1554
1555 static struct sm501_platdata sm501_pci_platdata = {
1556 .init = &sm501_pci_initdata,
1557 .fb = &sm501_fb_pdata,
1558 .gpio_base = -1,
1559 };
1560
1561 static int sm501_pci_probe(struct pci_dev *dev,
1562 const struct pci_device_id *id)
1563 {
1564 struct sm501_devdata *sm;
1565 int err;
1566
1567 sm = kzalloc(sizeof(*sm), GFP_KERNEL);
1568 if (!sm) {
1569 err = -ENOMEM;
1570 goto err1;
1571 }
1572
1573 /* set a default set of platform data */
1574 dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1575
1576 /* set a hopefully unique id for our child platform devices */
1577 sm->pdev_id = 32 + dev->devfn;
1578
1579 pci_set_drvdata(dev, sm);
1580
1581 err = pci_enable_device(dev);
1582 if (err) {
1583 dev_err(&dev->dev, "cannot enable device\n");
1584 goto err2;
1585 }
1586
1587 sm->dev = &dev->dev;
1588 sm->irq = dev->irq;
1589
1590 #ifdef __BIG_ENDIAN
1591 /* if the system is big-endian, we most probably have a
1592 * translation in the IO layer making the PCI bus little endian
1593 * so make the framebuffer swapped pixels */
1594
1595 sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1596 #endif
1597
1598 /* check our resources */
1599
1600 if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1601 dev_err(&dev->dev, "region #0 is not memory?\n");
1602 err = -EINVAL;
1603 goto err3;
1604 }
1605
1606 if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1607 dev_err(&dev->dev, "region #1 is not memory?\n");
1608 err = -EINVAL;
1609 goto err3;
1610 }
1611
1612 /* make our resources ready for sharing */
1613
1614 sm->io_res = &dev->resource[1];
1615 sm->mem_res = &dev->resource[0];
1616
1617 sm->regs_claim = request_mem_region(sm->io_res->start,
1618 0x100, "sm501");
1619 if (!sm->regs_claim) {
1620 dev_err(&dev->dev, "cannot claim registers\n");
1621 err= -EBUSY;
1622 goto err3;
1623 }
1624
1625 sm->regs = pci_ioremap_bar(dev, 1);
1626 if (!sm->regs) {
1627 dev_err(&dev->dev, "cannot remap registers\n");
1628 err = -EIO;
1629 goto err4;
1630 }
1631
1632 sm501_init_dev(sm);
1633 return 0;
1634
1635 err4:
1636 release_mem_region(sm->io_res->start, 0x100);
1637 err3:
1638 pci_disable_device(dev);
1639 err2:
1640 kfree(sm);
1641 err1:
1642 return err;
1643 }
1644
1645 static void sm501_remove_sub(struct sm501_devdata *sm,
1646 struct sm501_device *smdev)
1647 {
1648 list_del(&smdev->list);
1649 platform_device_unregister(&smdev->pdev);
1650 }
1651
1652 static void sm501_dev_remove(struct sm501_devdata *sm)
1653 {
1654 struct sm501_device *smdev, *tmp;
1655
1656 list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1657 sm501_remove_sub(sm, smdev);
1658
1659 device_remove_file(sm->dev, &dev_attr_dbg_regs);
1660
1661 sm501_gpio_remove(sm);
1662 }
1663
1664 static void sm501_pci_remove(struct pci_dev *dev)
1665 {
1666 struct sm501_devdata *sm = pci_get_drvdata(dev);
1667
1668 sm501_dev_remove(sm);
1669 iounmap(sm->regs);
1670
1671 release_mem_region(sm->io_res->start, 0x100);
1672
1673 pci_disable_device(dev);
1674 }
1675
1676 static int sm501_plat_remove(struct platform_device *dev)
1677 {
1678 struct sm501_devdata *sm = platform_get_drvdata(dev);
1679
1680 sm501_dev_remove(sm);
1681 iounmap(sm->regs);
1682
1683 release_mem_region(sm->io_res->start, 0x100);
1684
1685 return 0;
1686 }
1687
1688 static const struct pci_device_id sm501_pci_tbl[] = {
1689 { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1690 { 0, },
1691 };
1692
1693 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1694
1695 static struct pci_driver sm501_pci_driver = {
1696 .name = "sm501",
1697 .id_table = sm501_pci_tbl,
1698 .probe = sm501_pci_probe,
1699 .remove = sm501_pci_remove,
1700 };
1701
1702 MODULE_ALIAS("platform:sm501");
1703
1704 static const struct of_device_id of_sm501_match_tbl[] = {
1705 { .compatible = "smi,sm501", },
1706 { /* end */ }
1707 };
1708 MODULE_DEVICE_TABLE(of, of_sm501_match_tbl);
1709
1710 static struct platform_driver sm501_plat_driver = {
1711 .driver = {
1712 .name = "sm501",
1713 .of_match_table = of_sm501_match_tbl,
1714 },
1715 .probe = sm501_plat_probe,
1716 .remove = sm501_plat_remove,
1717 .suspend = sm501_plat_suspend,
1718 .resume = sm501_plat_resume,
1719 };
1720
1721 static int __init sm501_base_init(void)
1722 {
1723 platform_driver_register(&sm501_plat_driver);
1724 return pci_register_driver(&sm501_pci_driver);
1725 }
1726
1727 static void __exit sm501_base_exit(void)
1728 {
1729 platform_driver_unregister(&sm501_plat_driver);
1730 pci_unregister_driver(&sm501_pci_driver);
1731 }
1732
1733 module_init(sm501_base_init);
1734 module_exit(sm501_base_exit);
1735
1736 MODULE_DESCRIPTION("SM501 Core Driver");
1737 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1738 MODULE_LICENSE("GPL v2");
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