mfd: check for platform_get_irq() return value in sm501
[linux-2.6] / drivers / mfd / sm501.c
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
24 #include <linux/sm501.h>
25 #include <linux/sm501-regs.h>
26 #include <linux/serial_8250.h>
27
28 #include <asm/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 };
45
46 struct sm501_gpio {
47         struct sm501_gpio_chip  low;
48         struct sm501_gpio_chip  high;
49         spinlock_t              lock;
50
51         unsigned int             registered : 1;
52         void __iomem            *regs;
53         struct resource         *regs_res;
54 };
55 #else
56 struct sm501_gpio {
57         /* no gpio support, empty definition for sm501_devdata. */
58 };
59 #endif
60
61 struct sm501_devdata {
62         spinlock_t                       reg_lock;
63         struct mutex                     clock_lock;
64         struct list_head                 devices;
65         struct sm501_gpio                gpio;
66
67         struct device                   *dev;
68         struct resource                 *io_res;
69         struct resource                 *mem_res;
70         struct resource                 *regs_claim;
71         struct sm501_platdata           *platdata;
72
73
74         unsigned int                     in_suspend;
75         unsigned long                    pm_misc;
76
77         int                              unit_power[20];
78         unsigned int                     pdev_id;
79         unsigned int                     irq;
80         void __iomem                    *regs;
81         unsigned int                     rev;
82 };
83
84
85 #define MHZ (1000 * 1000)
86
87 #ifdef DEBUG
88 static const unsigned int div_tab[] = {
89         [0]             = 1,
90         [1]             = 2,
91         [2]             = 4,
92         [3]             = 8,
93         [4]             = 16,
94         [5]             = 32,
95         [6]             = 64,
96         [7]             = 128,
97         [8]             = 3,
98         [9]             = 6,
99         [10]            = 12,
100         [11]            = 24,
101         [12]            = 48,
102         [13]            = 96,
103         [14]            = 192,
104         [15]            = 384,
105         [16]            = 5,
106         [17]            = 10,
107         [18]            = 20,
108         [19]            = 40,
109         [20]            = 80,
110         [21]            = 160,
111         [22]            = 320,
112         [23]            = 604,
113 };
114
115 static unsigned long decode_div(unsigned long pll2, unsigned long val,
116                                 unsigned int lshft, unsigned int selbit,
117                                 unsigned long mask)
118 {
119         if (val & selbit)
120                 pll2 = 288 * MHZ;
121
122         return pll2 / div_tab[(val >> lshft) & mask];
123 }
124
125 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
126
127 /* sm501_dump_clk
128  *
129  * Print out the current clock configuration for the device
130 */
131
132 static void sm501_dump_clk(struct sm501_devdata *sm)
133 {
134         unsigned long misct = readl(sm->regs + SM501_MISC_TIMING);
135         unsigned long pm0 = readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
136         unsigned long pm1 = readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
137         unsigned long pmc = readl(sm->regs + SM501_POWER_MODE_CONTROL);
138         unsigned long sdclk0, sdclk1;
139         unsigned long pll2 = 0;
140
141         switch (misct & 0x30) {
142         case 0x00:
143                 pll2 = 336 * MHZ;
144                 break;
145         case 0x10:
146                 pll2 = 288 * MHZ;
147                 break;
148         case 0x20:
149                 pll2 = 240 * MHZ;
150                 break;
151         case 0x30:
152                 pll2 = 192 * MHZ;
153                 break;
154         }
155
156         sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
157         sdclk0 /= div_tab[((misct >> 8) & 0xf)];
158
159         sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
160         sdclk1 /= div_tab[((misct >> 16) & 0xf)];
161
162         dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
163                 misct, pm0, pm1);
164
165         dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
166                 fmt_freq(pll2), sdclk0, sdclk1);
167
168         dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
169
170         dev_dbg(sm->dev, "PM0[%c]: "
171                  "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
172                  "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
173                  (pmc & 3 ) == 0 ? '*' : '-',
174                  fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
175                  fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
176                  fmt_freq(decode_div(pll2, pm0, 8,  1<<12, 15)),
177                  fmt_freq(decode_div(pll2, pm0, 0,  1<<4,  15)));
178
179         dev_dbg(sm->dev, "PM1[%c]: "
180                 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
181                 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
182                 (pmc & 3 ) == 1 ? '*' : '-',
183                 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
184                 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
185                 fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15)),
186                 fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15)));
187 }
188
189 static void sm501_dump_regs(struct sm501_devdata *sm)
190 {
191         void __iomem *regs = sm->regs;
192
193         dev_info(sm->dev, "System Control   %08x\n",
194                         readl(regs + SM501_SYSTEM_CONTROL));
195         dev_info(sm->dev, "Misc Control     %08x\n",
196                         readl(regs + SM501_MISC_CONTROL));
197         dev_info(sm->dev, "GPIO Control Low %08x\n",
198                         readl(regs + SM501_GPIO31_0_CONTROL));
199         dev_info(sm->dev, "GPIO Control Hi  %08x\n",
200                         readl(regs + SM501_GPIO63_32_CONTROL));
201         dev_info(sm->dev, "DRAM Control     %08x\n",
202                         readl(regs + SM501_DRAM_CONTROL));
203         dev_info(sm->dev, "Arbitration Ctrl %08x\n",
204                         readl(regs + SM501_ARBTRTN_CONTROL));
205         dev_info(sm->dev, "Misc Timing      %08x\n",
206                         readl(regs + SM501_MISC_TIMING));
207 }
208
209 static void sm501_dump_gate(struct sm501_devdata *sm)
210 {
211         dev_info(sm->dev, "CurrentGate      %08x\n",
212                         readl(sm->regs + SM501_CURRENT_GATE));
213         dev_info(sm->dev, "CurrentClock     %08x\n",
214                         readl(sm->regs + SM501_CURRENT_CLOCK));
215         dev_info(sm->dev, "PowerModeControl %08x\n",
216                         readl(sm->regs + SM501_POWER_MODE_CONTROL));
217 }
218
219 #else
220 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
221 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
222 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
223 #endif
224
225 /* sm501_sync_regs
226  *
227  * ensure the
228 */
229
230 static void sm501_sync_regs(struct sm501_devdata *sm)
231 {
232         readl(sm->regs);
233 }
234
235 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
236 {
237         /* during suspend/resume, we are currently not allowed to sleep,
238          * so change to using mdelay() instead of msleep() if we
239          * are in one of these paths */
240
241         if (sm->in_suspend)
242                 mdelay(delay);
243         else
244                 msleep(delay);
245 }
246
247 /* sm501_misc_control
248  *
249  * alters the miscellaneous control parameters
250 */
251
252 int sm501_misc_control(struct device *dev,
253                        unsigned long set, unsigned long clear)
254 {
255         struct sm501_devdata *sm = dev_get_drvdata(dev);
256         unsigned long misc;
257         unsigned long save;
258         unsigned long to;
259
260         spin_lock_irqsave(&sm->reg_lock, save);
261
262         misc = readl(sm->regs + SM501_MISC_CONTROL);
263         to = (misc & ~clear) | set;
264
265         if (to != misc) {
266                 writel(to, sm->regs + SM501_MISC_CONTROL);
267                 sm501_sync_regs(sm);
268
269                 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
270         }
271
272         spin_unlock_irqrestore(&sm->reg_lock, save);
273         return to;
274 }
275
276 EXPORT_SYMBOL_GPL(sm501_misc_control);
277
278 /* sm501_modify_reg
279  *
280  * Modify a register in the SM501 which may be shared with other
281  * drivers.
282 */
283
284 unsigned long sm501_modify_reg(struct device *dev,
285                                unsigned long reg,
286                                unsigned long set,
287                                unsigned long clear)
288 {
289         struct sm501_devdata *sm = dev_get_drvdata(dev);
290         unsigned long data;
291         unsigned long save;
292
293         spin_lock_irqsave(&sm->reg_lock, save);
294
295         data = readl(sm->regs + reg);
296         data |= set;
297         data &= ~clear;
298
299         writel(data, sm->regs + reg);
300         sm501_sync_regs(sm);
301
302         spin_unlock_irqrestore(&sm->reg_lock, save);
303
304         return data;
305 }
306
307 EXPORT_SYMBOL_GPL(sm501_modify_reg);
308
309 /* sm501_unit_power
310  *
311  * alters the power active gate to set specific units on or off
312  */
313
314 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
315 {
316         struct sm501_devdata *sm = dev_get_drvdata(dev);
317         unsigned long mode;
318         unsigned long gate;
319         unsigned long clock;
320
321         mutex_lock(&sm->clock_lock);
322
323         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
324         gate = readl(sm->regs + SM501_CURRENT_GATE);
325         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
326
327         mode &= 3;              /* get current power mode */
328
329         if (unit >= ARRAY_SIZE(sm->unit_power)) {
330                 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
331                 goto already;
332         }
333
334         dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
335                 sm->unit_power[unit], to);
336
337         if (to == 0 && sm->unit_power[unit] == 0) {
338                 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
339                 goto already;
340         }
341
342         sm->unit_power[unit] += to ? 1 : -1;
343         to = sm->unit_power[unit] ? 1 : 0;
344
345         if (to) {
346                 if (gate & (1 << unit))
347                         goto already;
348                 gate |= (1 << unit);
349         } else {
350                 if (!(gate & (1 << unit)))
351                         goto already;
352                 gate &= ~(1 << unit);
353         }
354
355         switch (mode) {
356         case 1:
357                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
358                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
359                 mode = 0;
360                 break;
361         case 2:
362         case 0:
363                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
364                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
365                 mode = 1;
366                 break;
367
368         default:
369                 return -1;
370         }
371
372         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
373         sm501_sync_regs(sm);
374
375         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
376                 gate, clock, mode);
377
378         sm501_mdelay(sm, 16);
379
380  already:
381         mutex_unlock(&sm->clock_lock);
382         return gate;
383 }
384
385 EXPORT_SYMBOL_GPL(sm501_unit_power);
386
387
388 /* Perform a rounded division. */
389 static long sm501fb_round_div(long num, long denom)
390 {
391         /* n / d + 1 / 2 = (2n + d) / 2d */
392         return (2 * num + denom) / (2 * denom);
393 }
394
395 /* clock value structure. */
396 struct sm501_clock {
397         unsigned long mclk;
398         int divider;
399         int shift;
400         unsigned int m, n, k;
401 };
402
403 /* sm501_calc_clock
404  *
405  * Calculates the nearest discrete clock frequency that
406  * can be achieved with the specified input clock.
407  *   the maximum divisor is 3 or 5
408  */
409
410 static int sm501_calc_clock(unsigned long freq,
411                             struct sm501_clock *clock,
412                             int max_div,
413                             unsigned long mclk,
414                             long *best_diff)
415 {
416         int ret = 0;
417         int divider;
418         int shift;
419         long diff;
420
421         /* try dividers 1 and 3 for CRT and for panel,
422            try divider 5 for panel only.*/
423
424         for (divider = 1; divider <= max_div; divider += 2) {
425                 /* try all 8 shift values.*/
426                 for (shift = 0; shift < 8; shift++) {
427                         /* Calculate difference to requested clock */
428                         diff = sm501fb_round_div(mclk, divider << shift) - freq;
429                         if (diff < 0)
430                                 diff = -diff;
431
432                         /* If it is less than the current, use it */
433                         if (diff < *best_diff) {
434                                 *best_diff = diff;
435
436                                 clock->mclk = mclk;
437                                 clock->divider = divider;
438                                 clock->shift = shift;
439                                 ret = 1;
440                         }
441                 }
442         }
443
444         return ret;
445 }
446
447 /* sm501_calc_pll
448  *
449  * Calculates the nearest discrete clock frequency that can be
450  * achieved using the programmable PLL.
451  *   the maximum divisor is 3 or 5
452  */
453
454 static unsigned long sm501_calc_pll(unsigned long freq,
455                                         struct sm501_clock *clock,
456                                         int max_div)
457 {
458         unsigned long mclk;
459         unsigned int m, n, k;
460         long best_diff = 999999999;
461
462         /*
463          * The SM502 datasheet doesn't specify the min/max values for M and N.
464          * N = 1 at least doesn't work in practice.
465          */
466         for (m = 2; m <= 255; m++) {
467                 for (n = 2; n <= 127; n++) {
468                         for (k = 0; k <= 1; k++) {
469                                 mclk = (24000000UL * m / n) >> k;
470
471                                 if (sm501_calc_clock(freq, clock, max_div,
472                                                      mclk, &best_diff)) {
473                                         clock->m = m;
474                                         clock->n = n;
475                                         clock->k = k;
476                                 }
477                         }
478                 }
479         }
480
481         /* Return best clock. */
482         return clock->mclk / (clock->divider << clock->shift);
483 }
484
485 /* sm501_select_clock
486  *
487  * Calculates the nearest discrete clock frequency that can be
488  * achieved using the 288MHz and 336MHz PLLs.
489  *   the maximum divisor is 3 or 5
490  */
491
492 static unsigned long sm501_select_clock(unsigned long freq,
493                                         struct sm501_clock *clock,
494                                         int max_div)
495 {
496         unsigned long mclk;
497         long best_diff = 999999999;
498
499         /* Try 288MHz and 336MHz clocks. */
500         for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
501                 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
502         }
503
504         /* Return best clock. */
505         return clock->mclk / (clock->divider << clock->shift);
506 }
507
508 /* sm501_set_clock
509  *
510  * set one of the four clock sources to the closest available frequency to
511  *  the one specified
512 */
513
514 unsigned long sm501_set_clock(struct device *dev,
515                               int clksrc,
516                               unsigned long req_freq)
517 {
518         struct sm501_devdata *sm = dev_get_drvdata(dev);
519         unsigned long mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
520         unsigned long gate = readl(sm->regs + SM501_CURRENT_GATE);
521         unsigned long clock = readl(sm->regs + SM501_CURRENT_CLOCK);
522         unsigned char reg;
523         unsigned int pll_reg = 0;
524         unsigned long sm501_freq; /* the actual frequency acheived */
525
526         struct sm501_clock to;
527
528         /* find achivable discrete frequency and setup register value
529          * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
530          * has an extra bit for the divider */
531
532         switch (clksrc) {
533         case SM501_CLOCK_P2XCLK:
534                 /* This clock is divided in half so to achive the
535                  * requested frequency the value must be multiplied by
536                  * 2. This clock also has an additional pre divisor */
537
538                 if (sm->rev >= 0xC0) {
539                         /* SM502 -> use the programmable PLL */
540                         sm501_freq = (sm501_calc_pll(2 * req_freq,
541                                                      &to, 5) / 2);
542                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
543                         if (to.divider == 3)
544                                 reg |= 0x08; /* /3 divider required */
545                         else if (to.divider == 5)
546                                 reg |= 0x10; /* /5 divider required */
547                         reg |= 0x40; /* select the programmable PLL */
548                         pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
549                 } else {
550                         sm501_freq = (sm501_select_clock(2 * req_freq,
551                                                          &to, 5) / 2);
552                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
553                         if (to.divider == 3)
554                                 reg |= 0x08; /* /3 divider required */
555                         else if (to.divider == 5)
556                                 reg |= 0x10; /* /5 divider required */
557                         if (to.mclk != 288000000)
558                                 reg |= 0x20; /* which mclk pll is source */
559                 }
560                 break;
561
562         case SM501_CLOCK_V2XCLK:
563                 /* This clock is divided in half so to achive the
564                  * requested frequency the value must be multiplied by 2. */
565
566                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
567                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
568                 if (to.divider == 3)
569                         reg |= 0x08;    /* /3 divider required */
570                 if (to.mclk != 288000000)
571                         reg |= 0x10;    /* which mclk pll is source */
572                 break;
573
574         case SM501_CLOCK_MCLK:
575         case SM501_CLOCK_M1XCLK:
576                 /* These clocks are the same and not further divided */
577
578                 sm501_freq = sm501_select_clock( req_freq, &to, 3);
579                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
580                 if (to.divider == 3)
581                         reg |= 0x08;    /* /3 divider required */
582                 if (to.mclk != 288000000)
583                         reg |= 0x10;    /* which mclk pll is source */
584                 break;
585
586         default:
587                 return 0; /* this is bad */
588         }
589
590         mutex_lock(&sm->clock_lock);
591
592         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
593         gate = readl(sm->regs + SM501_CURRENT_GATE);
594         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
595
596         clock = clock & ~(0xFF << clksrc);
597         clock |= reg<<clksrc;
598
599         mode &= 3;      /* find current mode */
600
601         switch (mode) {
602         case 1:
603                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
604                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
605                 mode = 0;
606                 break;
607         case 2:
608         case 0:
609                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
610                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
611                 mode = 1;
612                 break;
613
614         default:
615                 mutex_unlock(&sm->clock_lock);
616                 return -1;
617         }
618
619         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
620
621         if (pll_reg)
622                 writel(pll_reg, sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
623
624         sm501_sync_regs(sm);
625
626         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
627                 gate, clock, mode);
628
629         sm501_mdelay(sm, 16);
630         mutex_unlock(&sm->clock_lock);
631
632         sm501_dump_clk(sm);
633
634         return sm501_freq;
635 }
636
637 EXPORT_SYMBOL_GPL(sm501_set_clock);
638
639 /* sm501_find_clock
640  *
641  * finds the closest available frequency for a given clock
642 */
643
644 unsigned long sm501_find_clock(struct device *dev,
645                                int clksrc,
646                                unsigned long req_freq)
647 {
648         struct sm501_devdata *sm = dev_get_drvdata(dev);
649         unsigned long sm501_freq; /* the frequency achiveable by the 501 */
650         struct sm501_clock to;
651
652         switch (clksrc) {
653         case SM501_CLOCK_P2XCLK:
654                 if (sm->rev >= 0xC0) {
655                         /* SM502 -> use the programmable PLL */
656                         sm501_freq = (sm501_calc_pll(2 * req_freq,
657                                                      &to, 5) / 2);
658                 } else {
659                         sm501_freq = (sm501_select_clock(2 * req_freq,
660                                                          &to, 5) / 2);
661                 }
662                 break;
663
664         case SM501_CLOCK_V2XCLK:
665                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
666                 break;
667
668         case SM501_CLOCK_MCLK:
669         case SM501_CLOCK_M1XCLK:
670                 sm501_freq = sm501_select_clock(req_freq, &to, 3);
671                 break;
672
673         default:
674                 sm501_freq = 0;         /* error */
675         }
676
677         return sm501_freq;
678 }
679
680 EXPORT_SYMBOL_GPL(sm501_find_clock);
681
682 static struct sm501_device *to_sm_device(struct platform_device *pdev)
683 {
684         return container_of(pdev, struct sm501_device, pdev);
685 }
686
687 /* sm501_device_release
688  *
689  * A release function for the platform devices we create to allow us to
690  * free any items we allocated
691 */
692
693 static void sm501_device_release(struct device *dev)
694 {
695         kfree(to_sm_device(to_platform_device(dev)));
696 }
697
698 /* sm501_create_subdev
699  *
700  * Create a skeleton platform device with resources for passing to a
701  * sub-driver
702 */
703
704 static struct platform_device *
705 sm501_create_subdev(struct sm501_devdata *sm, char *name,
706                     unsigned int res_count, unsigned int platform_data_size)
707 {
708         struct sm501_device *smdev;
709
710         smdev = kzalloc(sizeof(struct sm501_device) +
711                         (sizeof(struct resource) * res_count) +
712                         platform_data_size, GFP_KERNEL);
713         if (!smdev)
714                 return NULL;
715
716         smdev->pdev.dev.release = sm501_device_release;
717
718         smdev->pdev.name = name;
719         smdev->pdev.id = sm->pdev_id;
720         smdev->pdev.dev.parent = sm->dev;
721
722         if (res_count) {
723                 smdev->pdev.resource = (struct resource *)(smdev+1);
724                 smdev->pdev.num_resources = res_count;
725         }
726         if (platform_data_size)
727                 smdev->pdev.dev.platform_data = (void *)(smdev+1);
728
729         return &smdev->pdev;
730 }
731
732 /* sm501_register_device
733  *
734  * Register a platform device created with sm501_create_subdev()
735 */
736
737 static int sm501_register_device(struct sm501_devdata *sm,
738                                  struct platform_device *pdev)
739 {
740         struct sm501_device *smdev = to_sm_device(pdev);
741         int ptr;
742         int ret;
743
744         for (ptr = 0; ptr < pdev->num_resources; ptr++) {
745                 printk(KERN_DEBUG "%s[%d] flags %08lx: %08llx..%08llx\n",
746                        pdev->name, ptr,
747                        pdev->resource[ptr].flags,
748                        (unsigned long long)pdev->resource[ptr].start,
749                        (unsigned long long)pdev->resource[ptr].end);
750         }
751
752         ret = platform_device_register(pdev);
753
754         if (ret >= 0) {
755                 dev_dbg(sm->dev, "registered %s\n", pdev->name);
756                 list_add_tail(&smdev->list, &sm->devices);
757         } else
758                 dev_err(sm->dev, "error registering %s (%d)\n",
759                         pdev->name, ret);
760
761         return ret;
762 }
763
764 /* sm501_create_subio
765  *
766  * Fill in an IO resource for a sub device
767 */
768
769 static void sm501_create_subio(struct sm501_devdata *sm,
770                                struct resource *res,
771                                resource_size_t offs,
772                                resource_size_t size)
773 {
774         res->flags = IORESOURCE_MEM;
775         res->parent = sm->io_res;
776         res->start = sm->io_res->start + offs;
777         res->end = res->start + size - 1;
778 }
779
780 /* sm501_create_mem
781  *
782  * Fill in an MEM resource for a sub device
783 */
784
785 static void sm501_create_mem(struct sm501_devdata *sm,
786                              struct resource *res,
787                              resource_size_t *offs,
788                              resource_size_t size)
789 {
790         *offs -= size;          /* adjust memory size */
791
792         res->flags = IORESOURCE_MEM;
793         res->parent = sm->mem_res;
794         res->start = sm->mem_res->start + *offs;
795         res->end = res->start + size - 1;
796 }
797
798 /* sm501_create_irq
799  *
800  * Fill in an IRQ resource for a sub device
801 */
802
803 static void sm501_create_irq(struct sm501_devdata *sm,
804                              struct resource *res)
805 {
806         res->flags = IORESOURCE_IRQ;
807         res->parent = NULL;
808         res->start = res->end = sm->irq;
809 }
810
811 static int sm501_register_usbhost(struct sm501_devdata *sm,
812                                   resource_size_t *mem_avail)
813 {
814         struct platform_device *pdev;
815
816         pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
817         if (!pdev)
818                 return -ENOMEM;
819
820         sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
821         sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
822         sm501_create_irq(sm, &pdev->resource[2]);
823
824         return sm501_register_device(sm, pdev);
825 }
826
827 static void sm501_setup_uart_data(struct sm501_devdata *sm,
828                                   struct plat_serial8250_port *uart_data,
829                                   unsigned int offset)
830 {
831         uart_data->membase = sm->regs + offset;
832         uart_data->mapbase = sm->io_res->start + offset;
833         uart_data->iotype = UPIO_MEM;
834         uart_data->irq = sm->irq;
835         uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
836         uart_data->regshift = 2;
837         uart_data->uartclk = (9600 * 16);
838 }
839
840 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
841 {
842         struct platform_device *pdev;
843         struct plat_serial8250_port *uart_data;
844
845         pdev = sm501_create_subdev(sm, "serial8250", 0,
846                                    sizeof(struct plat_serial8250_port) * 3);
847         if (!pdev)
848                 return -ENOMEM;
849
850         uart_data = pdev->dev.platform_data;
851
852         if (devices & SM501_USE_UART0) {
853                 sm501_setup_uart_data(sm, uart_data++, 0x30000);
854                 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
855                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
856                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
857         }
858         if (devices & SM501_USE_UART1) {
859                 sm501_setup_uart_data(sm, uart_data++, 0x30020);
860                 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
861                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
862                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
863         }
864
865         pdev->id = PLAT8250_DEV_SM501;
866
867         return sm501_register_device(sm, pdev);
868 }
869
870 static int sm501_register_display(struct sm501_devdata *sm,
871                                   resource_size_t *mem_avail)
872 {
873         struct platform_device *pdev;
874
875         pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
876         if (!pdev)
877                 return -ENOMEM;
878
879         sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
880         sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
881         sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
882         sm501_create_irq(sm, &pdev->resource[3]);
883
884         return sm501_register_device(sm, pdev);
885 }
886
887 #ifdef CONFIG_MFD_SM501_GPIO
888
889 static inline struct sm501_gpio_chip *to_sm501_gpio(struct gpio_chip *gc)
890 {
891         return container_of(gc, struct sm501_gpio_chip, gpio);
892 }
893
894 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
895 {
896         return container_of(gpio, struct sm501_devdata, gpio);
897 }
898
899 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
900
901 {
902         struct sm501_gpio_chip *smgpio = to_sm501_gpio(chip);
903         unsigned long result;
904
905         result = readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
906         result >>= offset;
907
908         return result & 1UL;
909 }
910
911 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
912
913 {
914         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
915         struct sm501_gpio *smgpio = smchip->ourgpio;
916         unsigned long bit = 1 << offset;
917         void __iomem *regs = smchip->regbase;
918         unsigned long save;
919         unsigned long val;
920
921         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
922                 __func__, chip, offset);
923
924         spin_lock_irqsave(&smgpio->lock, save);
925
926         val = readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
927         if (value)
928                 val |= bit;
929         writel(val, regs);
930
931         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
932         spin_unlock_irqrestore(&smgpio->lock, save);
933 }
934
935 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
936 {
937         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
938         struct sm501_gpio *smgpio = smchip->ourgpio;
939         void __iomem *regs = smchip->regbase;
940         unsigned long bit = 1 << offset;
941         unsigned long save;
942         unsigned long ddr;
943
944         dev_info(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
945                  __func__, chip, offset);
946
947         spin_lock_irqsave(&smgpio->lock, save);
948
949         ddr = readl(regs + SM501_GPIO_DDR_LOW);
950         writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
951
952         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
953         spin_unlock_irqrestore(&smgpio->lock, save);
954
955         return 0;
956 }
957
958 static int sm501_gpio_output(struct gpio_chip *chip,
959                              unsigned offset, int value)
960 {
961         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
962         struct sm501_gpio *smgpio = smchip->ourgpio;
963         unsigned long bit = 1 << offset;
964         void __iomem *regs = smchip->regbase;
965         unsigned long save;
966         unsigned long val;
967         unsigned long ddr;
968
969         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
970                 __func__, chip, offset, value);
971
972         spin_lock_irqsave(&smgpio->lock, save);
973
974         val = readl(regs + SM501_GPIO_DATA_LOW);
975         if (value)
976                 val |= bit;
977         else
978                 val &= ~bit;
979         writel(val, regs);
980
981         ddr = readl(regs + SM501_GPIO_DDR_LOW);
982         writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
983
984         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
985         writel(val, regs + SM501_GPIO_DATA_LOW);
986
987         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
988         spin_unlock_irqrestore(&smgpio->lock, save);
989
990         return 0;
991 }
992
993 static struct gpio_chip gpio_chip_template = {
994         .ngpio                  = 32,
995         .direction_input        = sm501_gpio_input,
996         .direction_output       = sm501_gpio_output,
997         .set                    = sm501_gpio_set,
998         .get                    = sm501_gpio_get,
999 };
1000
1001 static int __devinit sm501_gpio_register_chip(struct sm501_devdata *sm,
1002                                               struct sm501_gpio *gpio,
1003                                               struct sm501_gpio_chip *chip)
1004 {
1005         struct sm501_platdata *pdata = sm->platdata;
1006         struct gpio_chip *gchip = &chip->gpio;
1007         int base = pdata->gpio_base;
1008
1009         chip->gpio = gpio_chip_template;
1010
1011         if (chip == &gpio->high) {
1012                 if (base > 0)
1013                         base += 32;
1014                 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1015                 gchip->label  = "SM501-HIGH";
1016         } else {
1017                 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1018                 gchip->label  = "SM501-LOW";
1019         }
1020
1021         gchip->base   = base;
1022         chip->ourgpio = gpio;
1023
1024         return gpiochip_add(gchip);
1025 }
1026
1027 static int sm501_register_gpio(struct sm501_devdata *sm)
1028 {
1029         struct sm501_gpio *gpio = &sm->gpio;
1030         resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1031         int ret;
1032         int tmp;
1033
1034         dev_dbg(sm->dev, "registering gpio block %08llx\n",
1035                 (unsigned long long)iobase);
1036
1037         spin_lock_init(&gpio->lock);
1038
1039         gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1040         if (gpio->regs_res == NULL) {
1041                 dev_err(sm->dev, "gpio: failed to request region\n");
1042                 return -ENXIO;
1043         }
1044
1045         gpio->regs = ioremap(iobase, 0x20);
1046         if (gpio->regs == NULL) {
1047                 dev_err(sm->dev, "gpio: failed to remap registers\n");
1048                 ret = -ENXIO;
1049                 goto err_claimed;
1050         }
1051
1052         /* Register both our chips. */
1053
1054         ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1055         if (ret) {
1056                 dev_err(sm->dev, "failed to add low chip\n");
1057                 goto err_mapped;
1058         }
1059
1060         ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1061         if (ret) {
1062                 dev_err(sm->dev, "failed to add high chip\n");
1063                 goto err_low_chip;
1064         }
1065
1066         gpio->registered = 1;
1067
1068         return 0;
1069
1070  err_low_chip:
1071         tmp = gpiochip_remove(&gpio->low.gpio);
1072         if (tmp) {
1073                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1074                 return ret;
1075         }
1076
1077  err_mapped:
1078         iounmap(gpio->regs);
1079
1080  err_claimed:
1081         release_resource(gpio->regs_res);
1082         kfree(gpio->regs_res);
1083
1084         return ret;
1085 }
1086
1087 static void sm501_gpio_remove(struct sm501_devdata *sm)
1088 {
1089         struct sm501_gpio *gpio = &sm->gpio;
1090         int ret;
1091
1092         if (!sm->gpio.registered)
1093                 return;
1094
1095         ret = gpiochip_remove(&gpio->low.gpio);
1096         if (ret)
1097                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1098
1099         ret = gpiochip_remove(&gpio->high.gpio);
1100         if (ret)
1101                 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1102
1103         iounmap(gpio->regs);
1104         release_resource(gpio->regs_res);
1105         kfree(gpio->regs_res);
1106 }
1107
1108 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1109 {
1110         struct sm501_gpio *gpio = &sm->gpio;
1111         int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1112
1113         return (pin % 32) + base;
1114 }
1115
1116 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1117 {
1118         return sm->gpio.registered;
1119 }
1120 #else
1121 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1122 {
1123         return 0;
1124 }
1125
1126 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1127 {
1128 }
1129
1130 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1131 {
1132         return -1;
1133 }
1134
1135 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1136 {
1137         return 0;
1138 }
1139 #endif
1140
1141 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1142                                             struct sm501_platdata_gpio_i2c *iic)
1143 {
1144         struct i2c_gpio_platform_data *icd;
1145         struct platform_device *pdev;
1146
1147         pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1148                                    sizeof(struct i2c_gpio_platform_data));
1149         if (!pdev)
1150                 return -ENOMEM;
1151
1152         icd = pdev->dev.platform_data;
1153
1154         /* We keep the pin_sda and pin_scl fields relative in case the
1155          * same platform data is passed to >1 SM501.
1156          */
1157
1158         icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1159         icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1160         icd->timeout = iic->timeout;
1161         icd->udelay = iic->udelay;
1162
1163         /* note, we can't use either of the pin numbers, as the i2c-gpio
1164          * driver uses the platform.id field to generate the bus number
1165          * to register with the i2c core; The i2c core doesn't have enough
1166          * entries to deal with anything we currently use.
1167         */
1168
1169         pdev->id = iic->bus_num;
1170
1171         dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1172                  iic->bus_num,
1173                  icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1174
1175         return sm501_register_device(sm, pdev);
1176 }
1177
1178 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1179                                    struct sm501_platdata *pdata)
1180 {
1181         struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1182         int index;
1183         int ret;
1184
1185         for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1186                 ret = sm501_register_gpio_i2c_instance(sm, iic);
1187                 if (ret < 0)
1188                         return ret;
1189         }
1190
1191         return 0;
1192 }
1193
1194 /* sm501_dbg_regs
1195  *
1196  * Debug attribute to attach to parent device to show core registers
1197 */
1198
1199 static ssize_t sm501_dbg_regs(struct device *dev,
1200                               struct device_attribute *attr, char *buff)
1201 {
1202         struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1203         unsigned int reg;
1204         char *ptr = buff;
1205         int ret;
1206
1207         for (reg = 0x00; reg < 0x70; reg += 4) {
1208                 ret = sprintf(ptr, "%08x = %08x\n",
1209                               reg, readl(sm->regs + reg));
1210                 ptr += ret;
1211         }
1212
1213         return ptr - buff;
1214 }
1215
1216
1217 static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);
1218
1219 /* sm501_init_reg
1220  *
1221  * Helper function for the init code to setup a register
1222  *
1223  * clear the bits which are set in r->mask, and then set
1224  * the bits set in r->set.
1225 */
1226
1227 static inline void sm501_init_reg(struct sm501_devdata *sm,
1228                                   unsigned long reg,
1229                                   struct sm501_reg_init *r)
1230 {
1231         unsigned long tmp;
1232
1233         tmp = readl(sm->regs + reg);
1234         tmp &= ~r->mask;
1235         tmp |= r->set;
1236         writel(tmp, sm->regs + reg);
1237 }
1238
1239 /* sm501_init_regs
1240  *
1241  * Setup core register values
1242 */
1243
1244 static void sm501_init_regs(struct sm501_devdata *sm,
1245                             struct sm501_initdata *init)
1246 {
1247         sm501_misc_control(sm->dev,
1248                            init->misc_control.set,
1249                            init->misc_control.mask);
1250
1251         sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1252         sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1253         sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1254
1255         if (init->m1xclk) {
1256                 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1257                 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1258         }
1259
1260         if (init->mclk) {
1261                 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1262                 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1263         }
1264
1265 }
1266
1267 /* Check the PLL sources for the M1CLK and M1XCLK
1268  *
1269  * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1270  * there is a risk (see errata AB-5) that the SM501 will cease proper
1271  * function. If this happens, then it is likely the SM501 will
1272  * hang the system.
1273 */
1274
1275 static int sm501_check_clocks(struct sm501_devdata *sm)
1276 {
1277         unsigned long pwrmode = readl(sm->regs + SM501_CURRENT_CLOCK);
1278         unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1279         unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1280
1281         return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1282 }
1283
1284 static unsigned int sm501_mem_local[] = {
1285         [0]     = 4*1024*1024,
1286         [1]     = 8*1024*1024,
1287         [2]     = 16*1024*1024,
1288         [3]     = 32*1024*1024,
1289         [4]     = 64*1024*1024,
1290         [5]     = 2*1024*1024,
1291 };
1292
1293 /* sm501_init_dev
1294  *
1295  * Common init code for an SM501
1296 */
1297
1298 static int sm501_init_dev(struct sm501_devdata *sm)
1299 {
1300         struct sm501_initdata *idata;
1301         struct sm501_platdata *pdata;
1302         resource_size_t mem_avail;
1303         unsigned long dramctrl;
1304         unsigned long devid;
1305         int ret;
1306
1307         mutex_init(&sm->clock_lock);
1308         spin_lock_init(&sm->reg_lock);
1309
1310         INIT_LIST_HEAD(&sm->devices);
1311
1312         devid = readl(sm->regs + SM501_DEVICEID);
1313
1314         if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1315                 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1316                 return -EINVAL;
1317         }
1318
1319         /* disable irqs */
1320         writel(0, sm->regs + SM501_IRQ_MASK);
1321
1322         dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
1323         mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1324
1325         dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1326                  sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1327
1328         sm->rev = devid & SM501_DEVICEID_REVMASK;
1329
1330         sm501_dump_gate(sm);
1331
1332         ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1333         if (ret)
1334                 dev_err(sm->dev, "failed to create debug regs file\n");
1335
1336         sm501_dump_clk(sm);
1337
1338         /* check to see if we have some device initialisation */
1339
1340         pdata = sm->platdata;
1341         idata = pdata ? pdata->init : NULL;
1342
1343         if (idata) {
1344                 sm501_init_regs(sm, idata);
1345
1346                 if (idata->devices & SM501_USE_USB_HOST)
1347                         sm501_register_usbhost(sm, &mem_avail);
1348                 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1349                         sm501_register_uart(sm, idata->devices);
1350                 if (idata->devices & SM501_USE_GPIO)
1351                         sm501_register_gpio(sm);
1352         }
1353
1354         if (pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1355                 if (!sm501_gpio_isregistered(sm))
1356                         dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1357                 else
1358                         sm501_register_gpio_i2c(sm, pdata);
1359         }
1360
1361         ret = sm501_check_clocks(sm);
1362         if (ret) {
1363                 dev_err(sm->dev, "M1X and M clocks sourced from different "
1364                                         "PLLs\n");
1365                 return -EINVAL;
1366         }
1367
1368         /* always create a framebuffer */
1369         sm501_register_display(sm, &mem_avail);
1370
1371         return 0;
1372 }
1373
1374 static int sm501_plat_probe(struct platform_device *dev)
1375 {
1376         struct sm501_devdata *sm;
1377         int ret;
1378
1379         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1380         if (sm == NULL) {
1381                 dev_err(&dev->dev, "no memory for device data\n");
1382                 ret = -ENOMEM;
1383                 goto err1;
1384         }
1385
1386         sm->dev = &dev->dev;
1387         sm->pdev_id = dev->id;
1388         sm->platdata = dev->dev.platform_data;
1389
1390         ret = platform_get_irq(dev, 0);
1391         if (ret < 0) {
1392                 dev_err(&dev->dev, "failed to get irq resource\n");
1393                 goto err_res;
1394         }
1395         sm->irq = ret;
1396
1397         sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1398         sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1399         if (sm->io_res == NULL || sm->mem_res == NULL) {
1400                 dev_err(&dev->dev, "failed to get IO resource\n");
1401                 ret = -ENOENT;
1402                 goto err_res;
1403         }
1404
1405         sm->regs_claim = request_mem_region(sm->io_res->start,
1406                                             0x100, "sm501");
1407
1408         if (sm->regs_claim == NULL) {
1409                 dev_err(&dev->dev, "cannot claim registers\n");
1410                 ret = -EBUSY;
1411                 goto err_res;
1412         }
1413
1414         platform_set_drvdata(dev, sm);
1415
1416         sm->regs = ioremap(sm->io_res->start,
1417                            (sm->io_res->end - sm->io_res->start) - 1);
1418
1419         if (sm->regs == NULL) {
1420                 dev_err(&dev->dev, "cannot remap registers\n");
1421                 ret = -EIO;
1422                 goto err_claim;
1423         }
1424
1425         return sm501_init_dev(sm);
1426
1427  err_claim:
1428         release_resource(sm->regs_claim);
1429         kfree(sm->regs_claim);
1430  err_res:
1431         kfree(sm);
1432  err1:
1433         return ret;
1434
1435 }
1436
1437 #ifdef CONFIG_PM
1438
1439 /* power management support */
1440
1441 static void sm501_set_power(struct sm501_devdata *sm, int on)
1442 {
1443         struct sm501_platdata *pd = sm->platdata;
1444
1445         if (pd == NULL)
1446                 return;
1447
1448         if (pd->get_power) {
1449                 if (pd->get_power(sm->dev) == on) {
1450                         dev_dbg(sm->dev, "is already %d\n", on);
1451                         return;
1452                 }
1453         }
1454
1455         if (pd->set_power) {
1456                 dev_dbg(sm->dev, "setting power to %d\n", on);
1457
1458                 pd->set_power(sm->dev, on);
1459                 sm501_mdelay(sm, 10);
1460         }
1461 }
1462
1463 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1464 {
1465         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1466
1467         sm->in_suspend = 1;
1468         sm->pm_misc = readl(sm->regs + SM501_MISC_CONTROL);
1469
1470         sm501_dump_regs(sm);
1471
1472         if (sm->platdata) {
1473                 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1474                         sm501_set_power(sm, 0);
1475         }
1476
1477         return 0;
1478 }
1479
1480 static int sm501_plat_resume(struct platform_device *pdev)
1481 {
1482         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1483
1484         sm501_set_power(sm, 1);
1485
1486         sm501_dump_regs(sm);
1487         sm501_dump_gate(sm);
1488         sm501_dump_clk(sm);
1489
1490         /* check to see if we are in the same state as when suspended */
1491
1492         if (readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1493                 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1494                 writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1495
1496                 /* our suspend causes the controller state to change,
1497                  * either by something attempting setup, power loss,
1498                  * or an external reset event on power change */
1499
1500                 if (sm->platdata && sm->platdata->init) {
1501                         sm501_init_regs(sm, sm->platdata->init);
1502                 }
1503         }
1504
1505         /* dump our state from resume */
1506
1507         sm501_dump_regs(sm);
1508         sm501_dump_clk(sm);
1509
1510         sm->in_suspend = 0;
1511
1512         return 0;
1513 }
1514 #else
1515 #define sm501_plat_suspend NULL
1516 #define sm501_plat_resume NULL
1517 #endif
1518
1519 /* Initialisation data for PCI devices */
1520
1521 static struct sm501_initdata sm501_pci_initdata = {
1522         .gpio_high      = {
1523                 .set    = 0x3F000000,           /* 24bit panel */
1524                 .mask   = 0x0,
1525         },
1526         .misc_timing    = {
1527                 .set    = 0x010100,             /* SDRAM timing */
1528                 .mask   = 0x1F1F00,
1529         },
1530         .misc_control   = {
1531                 .set    = SM501_MISC_PNL_24BIT,
1532                 .mask   = 0,
1533         },
1534
1535         .devices        = SM501_USE_ALL,
1536
1537         /* Errata AB-3 says that 72MHz is the fastest available
1538          * for 33MHZ PCI with proper bus-mastering operation */
1539
1540         .mclk           = 72 * MHZ,
1541         .m1xclk         = 144 * MHZ,
1542 };
1543
1544 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1545         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1546                            SM501FB_FLAG_USE_HWCURSOR |
1547                            SM501FB_FLAG_USE_HWACCEL |
1548                            SM501FB_FLAG_DISABLE_AT_EXIT),
1549 };
1550
1551 static struct sm501_platdata_fb sm501_fb_pdata = {
1552         .fb_route       = SM501_FB_OWN,
1553         .fb_crt         = &sm501_pdata_fbsub,
1554         .fb_pnl         = &sm501_pdata_fbsub,
1555 };
1556
1557 static struct sm501_platdata sm501_pci_platdata = {
1558         .init           = &sm501_pci_initdata,
1559         .fb             = &sm501_fb_pdata,
1560         .gpio_base      = -1,
1561 };
1562
1563 static int sm501_pci_probe(struct pci_dev *dev,
1564                            const struct pci_device_id *id)
1565 {
1566         struct sm501_devdata *sm;
1567         int err;
1568
1569         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1570         if (sm == NULL) {
1571                 dev_err(&dev->dev, "no memory for device data\n");
1572                 err = -ENOMEM;
1573                 goto err1;
1574         }
1575
1576         /* set a default set of platform data */
1577         dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1578
1579         /* set a hopefully unique id for our child platform devices */
1580         sm->pdev_id = 32 + dev->devfn;
1581
1582         pci_set_drvdata(dev, sm);
1583
1584         err = pci_enable_device(dev);
1585         if (err) {
1586                 dev_err(&dev->dev, "cannot enable device\n");
1587                 goto err2;
1588         }
1589
1590         sm->dev = &dev->dev;
1591         sm->irq = dev->irq;
1592
1593 #ifdef __BIG_ENDIAN
1594         /* if the system is big-endian, we most probably have a
1595          * translation in the IO layer making the PCI bus little endian
1596          * so make the framebuffer swapped pixels */
1597
1598         sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1599 #endif
1600
1601         /* check our resources */
1602
1603         if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1604                 dev_err(&dev->dev, "region #0 is not memory?\n");
1605                 err = -EINVAL;
1606                 goto err3;
1607         }
1608
1609         if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1610                 dev_err(&dev->dev, "region #1 is not memory?\n");
1611                 err = -EINVAL;
1612                 goto err3;
1613         }
1614
1615         /* make our resources ready for sharing */
1616
1617         sm->io_res = &dev->resource[1];
1618         sm->mem_res = &dev->resource[0];
1619
1620         sm->regs_claim = request_mem_region(sm->io_res->start,
1621                                             0x100, "sm501");
1622         if (sm->regs_claim == NULL) {
1623                 dev_err(&dev->dev, "cannot claim registers\n");
1624                 err= -EBUSY;
1625                 goto err3;
1626         }
1627
1628         sm->regs = pci_ioremap_bar(dev, 1);
1629
1630         if (sm->regs == NULL) {
1631                 dev_err(&dev->dev, "cannot remap registers\n");
1632                 err = -EIO;
1633                 goto err4;
1634         }
1635
1636         sm501_init_dev(sm);
1637         return 0;
1638
1639  err4:
1640         release_resource(sm->regs_claim);
1641         kfree(sm->regs_claim);
1642  err3:
1643         pci_disable_device(dev);
1644  err2:
1645         pci_set_drvdata(dev, NULL);
1646         kfree(sm);
1647  err1:
1648         return err;
1649 }
1650
1651 static void sm501_remove_sub(struct sm501_devdata *sm,
1652                              struct sm501_device *smdev)
1653 {
1654         list_del(&smdev->list);
1655         platform_device_unregister(&smdev->pdev);
1656 }
1657
1658 static void sm501_dev_remove(struct sm501_devdata *sm)
1659 {
1660         struct sm501_device *smdev, *tmp;
1661
1662         list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1663                 sm501_remove_sub(sm, smdev);
1664
1665         device_remove_file(sm->dev, &dev_attr_dbg_regs);
1666
1667         sm501_gpio_remove(sm);
1668 }
1669
1670 static void sm501_pci_remove(struct pci_dev *dev)
1671 {
1672         struct sm501_devdata *sm = pci_get_drvdata(dev);
1673
1674         sm501_dev_remove(sm);
1675         iounmap(sm->regs);
1676
1677         release_resource(sm->regs_claim);
1678         kfree(sm->regs_claim);
1679
1680         pci_set_drvdata(dev, NULL);
1681         pci_disable_device(dev);
1682 }
1683
1684 static int sm501_plat_remove(struct platform_device *dev)
1685 {
1686         struct sm501_devdata *sm = platform_get_drvdata(dev);
1687
1688         sm501_dev_remove(sm);
1689         iounmap(sm->regs);
1690
1691         release_resource(sm->regs_claim);
1692         kfree(sm->regs_claim);
1693
1694         return 0;
1695 }
1696
1697 static struct pci_device_id sm501_pci_tbl[] = {
1698         { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1699         { 0, },
1700 };
1701
1702 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1703
1704 static struct pci_driver sm501_pci_drv = {
1705         .name           = "sm501",
1706         .id_table       = sm501_pci_tbl,
1707         .probe          = sm501_pci_probe,
1708         .remove         = sm501_pci_remove,
1709 };
1710
1711 MODULE_ALIAS("platform:sm501");
1712
1713 static struct platform_driver sm501_plat_drv = {
1714         .driver         = {
1715                 .name   = "sm501",
1716                 .owner  = THIS_MODULE,
1717         },
1718         .probe          = sm501_plat_probe,
1719         .remove         = sm501_plat_remove,
1720         .suspend        = sm501_plat_suspend,
1721         .resume         = sm501_plat_resume,
1722 };
1723
1724 static int __init sm501_base_init(void)
1725 {
1726         platform_driver_register(&sm501_plat_drv);
1727         return pci_register_driver(&sm501_pci_drv);
1728 }
1729
1730 static void __exit sm501_base_exit(void)
1731 {
1732         platform_driver_unregister(&sm501_plat_drv);
1733         pci_unregister_driver(&sm501_pci_drv);
1734 }
1735
1736 module_init(sm501_base_init);
1737 module_exit(sm501_base_exit);
1738
1739 MODULE_DESCRIPTION("SM501 Core Driver");
1740 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1741 MODULE_LICENSE("GPL v2");