mfd: Fix twl-core oops while calling twl_i2c_* for unbound driver
[linux-2.6.git] / 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 #include <linux/slab.h>
24
25 #include <linux/sm501.h>
26 #include <linux/sm501-regs.h>
27 #include <linux/serial_8250.h>
28
29 #include <linux/io.h>
30
31 struct sm501_device {
32         struct list_head                list;
33         struct platform_device          pdev;
34 };
35
36 struct sm501_gpio;
37
38 #ifdef CONFIG_MFD_SM501_GPIO
39 #include <linux/gpio.h>
40
41 struct sm501_gpio_chip {
42         struct gpio_chip        gpio;
43         struct sm501_gpio       *ourgpio;       /* to get back to parent. */
44         void __iomem            *regbase;
45         void __iomem            *control;       /* address of control reg. */
46 };
47
48 struct sm501_gpio {
49         struct sm501_gpio_chip  low;
50         struct sm501_gpio_chip  high;
51         spinlock_t              lock;
52
53         unsigned int             registered : 1;
54         void __iomem            *regs;
55         struct resource         *regs_res;
56 };
57 #else
58 struct sm501_gpio {
59         /* no gpio support, empty definition for sm501_devdata. */
60 };
61 #endif
62
63 struct sm501_devdata {
64         spinlock_t                       reg_lock;
65         struct mutex                     clock_lock;
66         struct list_head                 devices;
67         struct sm501_gpio                gpio;
68
69         struct device                   *dev;
70         struct resource                 *io_res;
71         struct resource                 *mem_res;
72         struct resource                 *regs_claim;
73         struct sm501_platdata           *platdata;
74
75
76         unsigned int                     in_suspend;
77         unsigned long                    pm_misc;
78
79         int                              unit_power[20];
80         unsigned int                     pdev_id;
81         unsigned int                     irq;
82         void __iomem                    *regs;
83         unsigned int                     rev;
84 };
85
86
87 #define MHZ (1000 * 1000)
88
89 #ifdef DEBUG
90 static const unsigned int div_tab[] = {
91         [0]             = 1,
92         [1]             = 2,
93         [2]             = 4,
94         [3]             = 8,
95         [4]             = 16,
96         [5]             = 32,
97         [6]             = 64,
98         [7]             = 128,
99         [8]             = 3,
100         [9]             = 6,
101         [10]            = 12,
102         [11]            = 24,
103         [12]            = 48,
104         [13]            = 96,
105         [14]            = 192,
106         [15]            = 384,
107         [16]            = 5,
108         [17]            = 10,
109         [18]            = 20,
110         [19]            = 40,
111         [20]            = 80,
112         [21]            = 160,
113         [22]            = 320,
114         [23]            = 604,
115 };
116
117 static unsigned long decode_div(unsigned long pll2, unsigned long val,
118                                 unsigned int lshft, unsigned int selbit,
119                                 unsigned long mask)
120 {
121         if (val & selbit)
122                 pll2 = 288 * MHZ;
123
124         return pll2 / div_tab[(val >> lshft) & mask];
125 }
126
127 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
128
129 /* sm501_dump_clk
130  *
131  * Print out the current clock configuration for the device
132 */
133
134 static void sm501_dump_clk(struct sm501_devdata *sm)
135 {
136         unsigned long misct = smc501_readl(sm->regs + SM501_MISC_TIMING);
137         unsigned long pm0 = smc501_readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
138         unsigned long pm1 = smc501_readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
139         unsigned long pmc = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
140         unsigned long sdclk0, sdclk1;
141         unsigned long pll2 = 0;
142
143         switch (misct & 0x30) {
144         case 0x00:
145                 pll2 = 336 * MHZ;
146                 break;
147         case 0x10:
148                 pll2 = 288 * MHZ;
149                 break;
150         case 0x20:
151                 pll2 = 240 * MHZ;
152                 break;
153         case 0x30:
154                 pll2 = 192 * MHZ;
155                 break;
156         }
157
158         sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
159         sdclk0 /= div_tab[((misct >> 8) & 0xf)];
160
161         sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
162         sdclk1 /= div_tab[((misct >> 16) & 0xf)];
163
164         dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
165                 misct, pm0, pm1);
166
167         dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
168                 fmt_freq(pll2), sdclk0, sdclk1);
169
170         dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
171
172         dev_dbg(sm->dev, "PM0[%c]: "
173                  "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
174                  "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
175                  (pmc & 3 ) == 0 ? '*' : '-',
176                  fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
177                  fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
178                  fmt_freq(decode_div(pll2, pm0, 8,  1<<12, 15)),
179                  fmt_freq(decode_div(pll2, pm0, 0,  1<<4,  15)));
180
181         dev_dbg(sm->dev, "PM1[%c]: "
182                 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
183                 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
184                 (pmc & 3 ) == 1 ? '*' : '-',
185                 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
186                 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
187                 fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15)),
188                 fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15)));
189 }
190
191 static void sm501_dump_regs(struct sm501_devdata *sm)
192 {
193         void __iomem *regs = sm->regs;
194
195         dev_info(sm->dev, "System Control   %08x\n",
196                         smc501_readl(regs + SM501_SYSTEM_CONTROL));
197         dev_info(sm->dev, "Misc Control     %08x\n",
198                         smc501_readl(regs + SM501_MISC_CONTROL));
199         dev_info(sm->dev, "GPIO Control Low %08x\n",
200                         smc501_readl(regs + SM501_GPIO31_0_CONTROL));
201         dev_info(sm->dev, "GPIO Control Hi  %08x\n",
202                         smc501_readl(regs + SM501_GPIO63_32_CONTROL));
203         dev_info(sm->dev, "DRAM Control     %08x\n",
204                         smc501_readl(regs + SM501_DRAM_CONTROL));
205         dev_info(sm->dev, "Arbitration Ctrl %08x\n",
206                         smc501_readl(regs + SM501_ARBTRTN_CONTROL));
207         dev_info(sm->dev, "Misc Timing      %08x\n",
208                         smc501_readl(regs + SM501_MISC_TIMING));
209 }
210
211 static void sm501_dump_gate(struct sm501_devdata *sm)
212 {
213         dev_info(sm->dev, "CurrentGate      %08x\n",
214                         smc501_readl(sm->regs + SM501_CURRENT_GATE));
215         dev_info(sm->dev, "CurrentClock     %08x\n",
216                         smc501_readl(sm->regs + SM501_CURRENT_CLOCK));
217         dev_info(sm->dev, "PowerModeControl %08x\n",
218                         smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL));
219 }
220
221 #else
222 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
223 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
224 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
225 #endif
226
227 /* sm501_sync_regs
228  *
229  * ensure the
230 */
231
232 static void sm501_sync_regs(struct sm501_devdata *sm)
233 {
234         smc501_readl(sm->regs);
235 }
236
237 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
238 {
239         /* during suspend/resume, we are currently not allowed to sleep,
240          * so change to using mdelay() instead of msleep() if we
241          * are in one of these paths */
242
243         if (sm->in_suspend)
244                 mdelay(delay);
245         else
246                 msleep(delay);
247 }
248
249 /* sm501_misc_control
250  *
251  * alters the miscellaneous control parameters
252 */
253
254 int sm501_misc_control(struct device *dev,
255                        unsigned long set, unsigned long clear)
256 {
257         struct sm501_devdata *sm = dev_get_drvdata(dev);
258         unsigned long misc;
259         unsigned long save;
260         unsigned long to;
261
262         spin_lock_irqsave(&sm->reg_lock, save);
263
264         misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
265         to = (misc & ~clear) | set;
266
267         if (to != misc) {
268                 smc501_writel(to, sm->regs + SM501_MISC_CONTROL);
269                 sm501_sync_regs(sm);
270
271                 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
272         }
273
274         spin_unlock_irqrestore(&sm->reg_lock, save);
275         return to;
276 }
277
278 EXPORT_SYMBOL_GPL(sm501_misc_control);
279
280 /* sm501_modify_reg
281  *
282  * Modify a register in the SM501 which may be shared with other
283  * drivers.
284 */
285
286 unsigned long sm501_modify_reg(struct device *dev,
287                                unsigned long reg,
288                                unsigned long set,
289                                unsigned long clear)
290 {
291         struct sm501_devdata *sm = dev_get_drvdata(dev);
292         unsigned long data;
293         unsigned long save;
294
295         spin_lock_irqsave(&sm->reg_lock, save);
296
297         data = smc501_readl(sm->regs + reg);
298         data |= set;
299         data &= ~clear;
300
301         smc501_writel(data, sm->regs + reg);
302         sm501_sync_regs(sm);
303
304         spin_unlock_irqrestore(&sm->reg_lock, save);
305
306         return data;
307 }
308
309 EXPORT_SYMBOL_GPL(sm501_modify_reg);
310
311 /* sm501_unit_power
312  *
313  * alters the power active gate to set specific units on or off
314  */
315
316 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
317 {
318         struct sm501_devdata *sm = dev_get_drvdata(dev);
319         unsigned long mode;
320         unsigned long gate;
321         unsigned long clock;
322
323         mutex_lock(&sm->clock_lock);
324
325         mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
326         gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
327         clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
328
329         mode &= 3;              /* get current power mode */
330
331         if (unit >= ARRAY_SIZE(sm->unit_power)) {
332                 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
333                 goto already;
334         }
335
336         dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
337                 sm->unit_power[unit], to);
338
339         if (to == 0 && sm->unit_power[unit] == 0) {
340                 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
341                 goto already;
342         }
343
344         sm->unit_power[unit] += to ? 1 : -1;
345         to = sm->unit_power[unit] ? 1 : 0;
346
347         if (to) {
348                 if (gate & (1 << unit))
349                         goto already;
350                 gate |= (1 << unit);
351         } else {
352                 if (!(gate & (1 << unit)))
353                         goto already;
354                 gate &= ~(1 << unit);
355         }
356
357         switch (mode) {
358         case 1:
359                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
360                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
361                 mode = 0;
362                 break;
363         case 2:
364         case 0:
365                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
366                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
367                 mode = 1;
368                 break;
369
370         default:
371                 gate = -1;
372                 goto already;
373         }
374
375         smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
376         sm501_sync_regs(sm);
377
378         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
379                 gate, clock, mode);
380
381         sm501_mdelay(sm, 16);
382
383  already:
384         mutex_unlock(&sm->clock_lock);
385         return gate;
386 }
387
388 EXPORT_SYMBOL_GPL(sm501_unit_power);
389
390
391 /* Perform a rounded division. */
392 static long sm501fb_round_div(long num, long denom)
393 {
394         /* n / d + 1 / 2 = (2n + d) / 2d */
395         return (2 * num + denom) / (2 * denom);
396 }
397
398 /* clock value structure. */
399 struct sm501_clock {
400         unsigned long mclk;
401         int divider;
402         int shift;
403         unsigned int m, n, k;
404 };
405
406 /* sm501_calc_clock
407  *
408  * Calculates the nearest discrete clock frequency that
409  * can be achieved with the specified input clock.
410  *   the maximum divisor is 3 or 5
411  */
412
413 static int sm501_calc_clock(unsigned long freq,
414                             struct sm501_clock *clock,
415                             int max_div,
416                             unsigned long mclk,
417                             long *best_diff)
418 {
419         int ret = 0;
420         int divider;
421         int shift;
422         long diff;
423
424         /* try dividers 1 and 3 for CRT and for panel,
425            try divider 5 for panel only.*/
426
427         for (divider = 1; divider <= max_div; divider += 2) {
428                 /* try all 8 shift values.*/
429                 for (shift = 0; shift < 8; shift++) {
430                         /* Calculate difference to requested clock */
431                         diff = sm501fb_round_div(mclk, divider << shift) - freq;
432                         if (diff < 0)
433                                 diff = -diff;
434
435                         /* If it is less than the current, use it */
436                         if (diff < *best_diff) {
437                                 *best_diff = diff;
438
439                                 clock->mclk = mclk;
440                                 clock->divider = divider;
441                                 clock->shift = shift;
442                                 ret = 1;
443                         }
444                 }
445         }
446
447         return ret;
448 }
449
450 /* sm501_calc_pll
451  *
452  * Calculates the nearest discrete clock frequency that can be
453  * achieved using the programmable PLL.
454  *   the maximum divisor is 3 or 5
455  */
456
457 static unsigned long sm501_calc_pll(unsigned long freq,
458                                         struct sm501_clock *clock,
459                                         int max_div)
460 {
461         unsigned long mclk;
462         unsigned int m, n, k;
463         long best_diff = 999999999;
464
465         /*
466          * The SM502 datasheet doesn't specify the min/max values for M and N.
467          * N = 1 at least doesn't work in practice.
468          */
469         for (m = 2; m <= 255; m++) {
470                 for (n = 2; n <= 127; n++) {
471                         for (k = 0; k <= 1; k++) {
472                                 mclk = (24000000UL * m / n) >> k;
473
474                                 if (sm501_calc_clock(freq, clock, max_div,
475                                                      mclk, &best_diff)) {
476                                         clock->m = m;
477                                         clock->n = n;
478                                         clock->k = k;
479                                 }
480                         }
481                 }
482         }
483
484         /* Return best clock. */
485         return clock->mclk / (clock->divider << clock->shift);
486 }
487
488 /* sm501_select_clock
489  *
490  * Calculates the nearest discrete clock frequency that can be
491  * achieved using the 288MHz and 336MHz PLLs.
492  *   the maximum divisor is 3 or 5
493  */
494
495 static unsigned long sm501_select_clock(unsigned long freq,
496                                         struct sm501_clock *clock,
497                                         int max_div)
498 {
499         unsigned long mclk;
500         long best_diff = 999999999;
501
502         /* Try 288MHz and 336MHz clocks. */
503         for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
504                 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
505         }
506
507         /* Return best clock. */
508         return clock->mclk / (clock->divider << clock->shift);
509 }
510
511 /* sm501_set_clock
512  *
513  * set one of the four clock sources to the closest available frequency to
514  *  the one specified
515 */
516
517 unsigned long sm501_set_clock(struct device *dev,
518                               int clksrc,
519                               unsigned long req_freq)
520 {
521         struct sm501_devdata *sm = dev_get_drvdata(dev);
522         unsigned long mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
523         unsigned long gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
524         unsigned long clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
525         unsigned char reg;
526         unsigned int pll_reg = 0;
527         unsigned long sm501_freq; /* the actual frequency achieved */
528
529         struct sm501_clock to;
530
531         /* find achivable discrete frequency and setup register value
532          * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
533          * has an extra bit for the divider */
534
535         switch (clksrc) {
536         case SM501_CLOCK_P2XCLK:
537                 /* This clock is divided in half so to achieve the
538                  * requested frequency the value must be multiplied by
539                  * 2. This clock also has an additional pre divisor */
540
541                 if (sm->rev >= 0xC0) {
542                         /* SM502 -> use the programmable PLL */
543                         sm501_freq = (sm501_calc_pll(2 * req_freq,
544                                                      &to, 5) / 2);
545                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
546                         if (to.divider == 3)
547                                 reg |= 0x08; /* /3 divider required */
548                         else if (to.divider == 5)
549                                 reg |= 0x10; /* /5 divider required */
550                         reg |= 0x40; /* select the programmable PLL */
551                         pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
552                 } else {
553                         sm501_freq = (sm501_select_clock(2 * req_freq,
554                                                          &to, 5) / 2);
555                         reg = to.shift & 0x07;/* bottom 3 bits are shift */
556                         if (to.divider == 3)
557                                 reg |= 0x08; /* /3 divider required */
558                         else if (to.divider == 5)
559                                 reg |= 0x10; /* /5 divider required */
560                         if (to.mclk != 288000000)
561                                 reg |= 0x20; /* which mclk pll is source */
562                 }
563                 break;
564
565         case SM501_CLOCK_V2XCLK:
566                 /* This clock is divided in half so to achieve the
567                  * requested frequency the value must be multiplied by 2. */
568
569                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
570                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
571                 if (to.divider == 3)
572                         reg |= 0x08;    /* /3 divider required */
573                 if (to.mclk != 288000000)
574                         reg |= 0x10;    /* which mclk pll is source */
575                 break;
576
577         case SM501_CLOCK_MCLK:
578         case SM501_CLOCK_M1XCLK:
579                 /* These clocks are the same and not further divided */
580
581                 sm501_freq = sm501_select_clock( req_freq, &to, 3);
582                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
583                 if (to.divider == 3)
584                         reg |= 0x08;    /* /3 divider required */
585                 if (to.mclk != 288000000)
586                         reg |= 0x10;    /* which mclk pll is source */
587                 break;
588
589         default:
590                 return 0; /* this is bad */
591         }
592
593         mutex_lock(&sm->clock_lock);
594
595         mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
596         gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
597         clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
598
599         clock = clock & ~(0xFF << clksrc);
600         clock |= reg<<clksrc;
601
602         mode &= 3;      /* find current mode */
603
604         switch (mode) {
605         case 1:
606                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
607                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
608                 mode = 0;
609                 break;
610         case 2:
611         case 0:
612                 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
613                 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
614                 mode = 1;
615                 break;
616
617         default:
618                 mutex_unlock(&sm->clock_lock);
619                 return -1;
620         }
621
622         smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
623
624         if (pll_reg)
625                 smc501_writel(pll_reg,
626                                 sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
627
628         sm501_sync_regs(sm);
629
630         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
631                 gate, clock, mode);
632
633         sm501_mdelay(sm, 16);
634         mutex_unlock(&sm->clock_lock);
635
636         sm501_dump_clk(sm);
637
638         return sm501_freq;
639 }
640
641 EXPORT_SYMBOL_GPL(sm501_set_clock);
642
643 /* sm501_find_clock
644  *
645  * finds the closest available frequency for a given clock
646 */
647
648 unsigned long sm501_find_clock(struct device *dev,
649                                int clksrc,
650                                unsigned long req_freq)
651 {
652         struct sm501_devdata *sm = dev_get_drvdata(dev);
653         unsigned long sm501_freq; /* the frequency achieveable by the 501 */
654         struct sm501_clock to;
655
656         switch (clksrc) {
657         case SM501_CLOCK_P2XCLK:
658                 if (sm->rev >= 0xC0) {
659                         /* SM502 -> use the programmable PLL */
660                         sm501_freq = (sm501_calc_pll(2 * req_freq,
661                                                      &to, 5) / 2);
662                 } else {
663                         sm501_freq = (sm501_select_clock(2 * req_freq,
664                                                          &to, 5) / 2);
665                 }
666                 break;
667
668         case SM501_CLOCK_V2XCLK:
669                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
670                 break;
671
672         case SM501_CLOCK_MCLK:
673         case SM501_CLOCK_M1XCLK:
674                 sm501_freq = sm501_select_clock(req_freq, &to, 3);
675                 break;
676
677         default:
678                 sm501_freq = 0;         /* error */
679         }
680
681         return sm501_freq;
682 }
683
684 EXPORT_SYMBOL_GPL(sm501_find_clock);
685
686 static struct sm501_device *to_sm_device(struct platform_device *pdev)
687 {
688         return container_of(pdev, struct sm501_device, pdev);
689 }
690
691 /* sm501_device_release
692  *
693  * A release function for the platform devices we create to allow us to
694  * free any items we allocated
695 */
696
697 static void sm501_device_release(struct device *dev)
698 {
699         kfree(to_sm_device(to_platform_device(dev)));
700 }
701
702 /* sm501_create_subdev
703  *
704  * Create a skeleton platform device with resources for passing to a
705  * sub-driver
706 */
707
708 static struct platform_device *
709 sm501_create_subdev(struct sm501_devdata *sm, char *name,
710                     unsigned int res_count, unsigned int platform_data_size)
711 {
712         struct sm501_device *smdev;
713
714         smdev = kzalloc(sizeof(struct sm501_device) +
715                         (sizeof(struct resource) * res_count) +
716                         platform_data_size, GFP_KERNEL);
717         if (!smdev)
718                 return NULL;
719
720         smdev->pdev.dev.release = sm501_device_release;
721
722         smdev->pdev.name = name;
723         smdev->pdev.id = sm->pdev_id;
724         smdev->pdev.dev.parent = sm->dev;
725
726         if (res_count) {
727                 smdev->pdev.resource = (struct resource *)(smdev+1);
728                 smdev->pdev.num_resources = res_count;
729         }
730         if (platform_data_size)
731                 smdev->pdev.dev.platform_data = (void *)(smdev+1);
732
733         return &smdev->pdev;
734 }
735
736 /* sm501_register_device
737  *
738  * Register a platform device created with sm501_create_subdev()
739 */
740
741 static int sm501_register_device(struct sm501_devdata *sm,
742                                  struct platform_device *pdev)
743 {
744         struct sm501_device *smdev = to_sm_device(pdev);
745         int ptr;
746         int ret;
747
748         for (ptr = 0; ptr < pdev->num_resources; ptr++) {
749                 printk(KERN_DEBUG "%s[%d] %pR\n",
750                        pdev->name, ptr, &pdev->resource[ptr]);
751         }
752
753         ret = platform_device_register(pdev);
754
755         if (ret >= 0) {
756                 dev_dbg(sm->dev, "registered %s\n", pdev->name);
757                 list_add_tail(&smdev->list, &sm->devices);
758         } else
759                 dev_err(sm->dev, "error registering %s (%d)\n",
760                         pdev->name, ret);
761
762         return ret;
763 }
764
765 /* sm501_create_subio
766  *
767  * Fill in an IO resource for a sub device
768 */
769
770 static void sm501_create_subio(struct sm501_devdata *sm,
771                                struct resource *res,
772                                resource_size_t offs,
773                                resource_size_t size)
774 {
775         res->flags = IORESOURCE_MEM;
776         res->parent = sm->io_res;
777         res->start = sm->io_res->start + offs;
778         res->end = res->start + size - 1;
779 }
780
781 /* sm501_create_mem
782  *
783  * Fill in an MEM resource for a sub device
784 */
785
786 static void sm501_create_mem(struct sm501_devdata *sm,
787                              struct resource *res,
788                              resource_size_t *offs,
789                              resource_size_t size)
790 {
791         *offs -= size;          /* adjust memory size */
792
793         res->flags = IORESOURCE_MEM;
794         res->parent = sm->mem_res;
795         res->start = sm->mem_res->start + *offs;
796         res->end = res->start + size - 1;
797 }
798
799 /* sm501_create_irq
800  *
801  * Fill in an IRQ resource for a sub device
802 */
803
804 static void sm501_create_irq(struct sm501_devdata *sm,
805                              struct resource *res)
806 {
807         res->flags = IORESOURCE_IRQ;
808         res->parent = NULL;
809         res->start = res->end = sm->irq;
810 }
811
812 static int sm501_register_usbhost(struct sm501_devdata *sm,
813                                   resource_size_t *mem_avail)
814 {
815         struct platform_device *pdev;
816
817         pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
818         if (!pdev)
819                 return -ENOMEM;
820
821         sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
822         sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
823         sm501_create_irq(sm, &pdev->resource[2]);
824
825         return sm501_register_device(sm, pdev);
826 }
827
828 static void sm501_setup_uart_data(struct sm501_devdata *sm,
829                                   struct plat_serial8250_port *uart_data,
830                                   unsigned int offset)
831 {
832         uart_data->membase = sm->regs + offset;
833         uart_data->mapbase = sm->io_res->start + offset;
834         uart_data->iotype = UPIO_MEM;
835         uart_data->irq = sm->irq;
836         uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
837         uart_data->regshift = 2;
838         uart_data->uartclk = (9600 * 16);
839 }
840
841 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
842 {
843         struct platform_device *pdev;
844         struct plat_serial8250_port *uart_data;
845
846         pdev = sm501_create_subdev(sm, "serial8250", 0,
847                                    sizeof(struct plat_serial8250_port) * 3);
848         if (!pdev)
849                 return -ENOMEM;
850
851         uart_data = pdev->dev.platform_data;
852
853         if (devices & SM501_USE_UART0) {
854                 sm501_setup_uart_data(sm, uart_data++, 0x30000);
855                 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
856                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
857                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
858         }
859         if (devices & SM501_USE_UART1) {
860                 sm501_setup_uart_data(sm, uart_data++, 0x30020);
861                 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
862                 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
863                 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
864         }
865
866         pdev->id = PLAT8250_DEV_SM501;
867
868         return sm501_register_device(sm, pdev);
869 }
870
871 static int sm501_register_display(struct sm501_devdata *sm,
872                                   resource_size_t *mem_avail)
873 {
874         struct platform_device *pdev;
875
876         pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
877         if (!pdev)
878                 return -ENOMEM;
879
880         sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
881         sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
882         sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
883         sm501_create_irq(sm, &pdev->resource[3]);
884
885         return sm501_register_device(sm, pdev);
886 }
887
888 #ifdef CONFIG_MFD_SM501_GPIO
889
890 static inline struct sm501_gpio_chip *to_sm501_gpio(struct gpio_chip *gc)
891 {
892         return container_of(gc, struct sm501_gpio_chip, gpio);
893 }
894
895 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
896 {
897         return container_of(gpio, struct sm501_devdata, gpio);
898 }
899
900 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
901
902 {
903         struct sm501_gpio_chip *smgpio = to_sm501_gpio(chip);
904         unsigned long result;
905
906         result = smc501_readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
907         result >>= offset;
908
909         return result & 1UL;
910 }
911
912 static void sm501_gpio_ensure_gpio(struct sm501_gpio_chip *smchip,
913                                    unsigned long bit)
914 {
915         unsigned long ctrl;
916
917         /* check and modify if this pin is not set as gpio. */
918
919         if (smc501_readl(smchip->control) & bit) {
920                 dev_info(sm501_gpio_to_dev(smchip->ourgpio)->dev,
921                          "changing mode of gpio, bit %08lx\n", bit);
922
923                 ctrl = smc501_readl(smchip->control);
924                 ctrl &= ~bit;
925                 smc501_writel(ctrl, smchip->control);
926
927                 sm501_sync_regs(sm501_gpio_to_dev(smchip->ourgpio));
928         }
929 }
930
931 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
932
933 {
934         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
935         struct sm501_gpio *smgpio = smchip->ourgpio;
936         unsigned long bit = 1 << offset;
937         void __iomem *regs = smchip->regbase;
938         unsigned long save;
939         unsigned long val;
940
941         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
942                 __func__, chip, offset);
943
944         spin_lock_irqsave(&smgpio->lock, save);
945
946         val = smc501_readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
947         if (value)
948                 val |= bit;
949         smc501_writel(val, regs);
950
951         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
952         sm501_gpio_ensure_gpio(smchip, bit);
953
954         spin_unlock_irqrestore(&smgpio->lock, save);
955 }
956
957 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
958 {
959         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
960         struct sm501_gpio *smgpio = smchip->ourgpio;
961         void __iomem *regs = smchip->regbase;
962         unsigned long bit = 1 << offset;
963         unsigned long save;
964         unsigned long ddr;
965
966         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
967                 __func__, chip, offset);
968
969         spin_lock_irqsave(&smgpio->lock, save);
970
971         ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
972         smc501_writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
973
974         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
975         sm501_gpio_ensure_gpio(smchip, bit);
976
977         spin_unlock_irqrestore(&smgpio->lock, save);
978
979         return 0;
980 }
981
982 static int sm501_gpio_output(struct gpio_chip *chip,
983                              unsigned offset, int value)
984 {
985         struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
986         struct sm501_gpio *smgpio = smchip->ourgpio;
987         unsigned long bit = 1 << offset;
988         void __iomem *regs = smchip->regbase;
989         unsigned long save;
990         unsigned long val;
991         unsigned long ddr;
992
993         dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
994                 __func__, chip, offset, value);
995
996         spin_lock_irqsave(&smgpio->lock, save);
997
998         val = smc501_readl(regs + SM501_GPIO_DATA_LOW);
999         if (value)
1000                 val |= bit;
1001         else
1002                 val &= ~bit;
1003         smc501_writel(val, regs);
1004
1005         ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
1006         smc501_writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
1007
1008         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1009         smc501_writel(val, regs + SM501_GPIO_DATA_LOW);
1010
1011         sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1012         spin_unlock_irqrestore(&smgpio->lock, save);
1013
1014         return 0;
1015 }
1016
1017 static struct gpio_chip gpio_chip_template = {
1018         .ngpio                  = 32,
1019         .direction_input        = sm501_gpio_input,
1020         .direction_output       = sm501_gpio_output,
1021         .set                    = sm501_gpio_set,
1022         .get                    = sm501_gpio_get,
1023 };
1024
1025 static int __devinit sm501_gpio_register_chip(struct sm501_devdata *sm,
1026                                               struct sm501_gpio *gpio,
1027                                               struct sm501_gpio_chip *chip)
1028 {
1029         struct sm501_platdata *pdata = sm->platdata;
1030         struct gpio_chip *gchip = &chip->gpio;
1031         int base = pdata->gpio_base;
1032
1033         chip->gpio = gpio_chip_template;
1034
1035         if (chip == &gpio->high) {
1036                 if (base > 0)
1037                         base += 32;
1038                 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1039                 chip->control = sm->regs + SM501_GPIO63_32_CONTROL;
1040                 gchip->label  = "SM501-HIGH";
1041         } else {
1042                 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1043                 chip->control = sm->regs + SM501_GPIO31_0_CONTROL;
1044                 gchip->label  = "SM501-LOW";
1045         }
1046
1047         gchip->base   = base;
1048         chip->ourgpio = gpio;
1049
1050         return gpiochip_add(gchip);
1051 }
1052
1053 static int __devinit sm501_register_gpio(struct sm501_devdata *sm)
1054 {
1055         struct sm501_gpio *gpio = &sm->gpio;
1056         resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1057         int ret;
1058         int tmp;
1059
1060         dev_dbg(sm->dev, "registering gpio block %08llx\n",
1061                 (unsigned long long)iobase);
1062
1063         spin_lock_init(&gpio->lock);
1064
1065         gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1066         if (gpio->regs_res == NULL) {
1067                 dev_err(sm->dev, "gpio: failed to request region\n");
1068                 return -ENXIO;
1069         }
1070
1071         gpio->regs = ioremap(iobase, 0x20);
1072         if (gpio->regs == NULL) {
1073                 dev_err(sm->dev, "gpio: failed to remap registers\n");
1074                 ret = -ENXIO;
1075                 goto err_claimed;
1076         }
1077
1078         /* Register both our chips. */
1079
1080         ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1081         if (ret) {
1082                 dev_err(sm->dev, "failed to add low chip\n");
1083                 goto err_mapped;
1084         }
1085
1086         ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1087         if (ret) {
1088                 dev_err(sm->dev, "failed to add high chip\n");
1089                 goto err_low_chip;
1090         }
1091
1092         gpio->registered = 1;
1093
1094         return 0;
1095
1096  err_low_chip:
1097         tmp = gpiochip_remove(&gpio->low.gpio);
1098         if (tmp) {
1099                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1100                 return ret;
1101         }
1102
1103  err_mapped:
1104         iounmap(gpio->regs);
1105
1106  err_claimed:
1107         release_resource(gpio->regs_res);
1108         kfree(gpio->regs_res);
1109
1110         return ret;
1111 }
1112
1113 static void sm501_gpio_remove(struct sm501_devdata *sm)
1114 {
1115         struct sm501_gpio *gpio = &sm->gpio;
1116         int ret;
1117
1118         if (!sm->gpio.registered)
1119                 return;
1120
1121         ret = gpiochip_remove(&gpio->low.gpio);
1122         if (ret)
1123                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1124
1125         ret = gpiochip_remove(&gpio->high.gpio);
1126         if (ret)
1127                 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1128
1129         iounmap(gpio->regs);
1130         release_resource(gpio->regs_res);
1131         kfree(gpio->regs_res);
1132 }
1133
1134 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1135 {
1136         struct sm501_gpio *gpio = &sm->gpio;
1137         int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1138
1139         return (pin % 32) + base;
1140 }
1141
1142 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1143 {
1144         return sm->gpio.registered;
1145 }
1146 #else
1147 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1148 {
1149         return 0;
1150 }
1151
1152 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1153 {
1154 }
1155
1156 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1157 {
1158         return -1;
1159 }
1160
1161 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1162 {
1163         return 0;
1164 }
1165 #endif
1166
1167 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1168                                             struct sm501_platdata_gpio_i2c *iic)
1169 {
1170         struct i2c_gpio_platform_data *icd;
1171         struct platform_device *pdev;
1172
1173         pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1174                                    sizeof(struct i2c_gpio_platform_data));
1175         if (!pdev)
1176                 return -ENOMEM;
1177
1178         icd = pdev->dev.platform_data;
1179
1180         /* We keep the pin_sda and pin_scl fields relative in case the
1181          * same platform data is passed to >1 SM501.
1182          */
1183
1184         icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1185         icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1186         icd->timeout = iic->timeout;
1187         icd->udelay = iic->udelay;
1188
1189         /* note, we can't use either of the pin numbers, as the i2c-gpio
1190          * driver uses the platform.id field to generate the bus number
1191          * to register with the i2c core; The i2c core doesn't have enough
1192          * entries to deal with anything we currently use.
1193         */
1194
1195         pdev->id = iic->bus_num;
1196
1197         dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1198                  iic->bus_num,
1199                  icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1200
1201         return sm501_register_device(sm, pdev);
1202 }
1203
1204 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1205                                    struct sm501_platdata *pdata)
1206 {
1207         struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1208         int index;
1209         int ret;
1210
1211         for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1212                 ret = sm501_register_gpio_i2c_instance(sm, iic);
1213                 if (ret < 0)
1214                         return ret;
1215         }
1216
1217         return 0;
1218 }
1219
1220 /* sm501_dbg_regs
1221  *
1222  * Debug attribute to attach to parent device to show core registers
1223 */
1224
1225 static ssize_t sm501_dbg_regs(struct device *dev,
1226                               struct device_attribute *attr, char *buff)
1227 {
1228         struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1229         unsigned int reg;
1230         char *ptr = buff;
1231         int ret;
1232
1233         for (reg = 0x00; reg < 0x70; reg += 4) {
1234                 ret = sprintf(ptr, "%08x = %08x\n",
1235                               reg, smc501_readl(sm->regs + reg));
1236                 ptr += ret;
1237         }
1238
1239         return ptr - buff;
1240 }
1241
1242
1243 static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);
1244
1245 /* sm501_init_reg
1246  *
1247  * Helper function for the init code to setup a register
1248  *
1249  * clear the bits which are set in r->mask, and then set
1250  * the bits set in r->set.
1251 */
1252
1253 static inline void sm501_init_reg(struct sm501_devdata *sm,
1254                                   unsigned long reg,
1255                                   struct sm501_reg_init *r)
1256 {
1257         unsigned long tmp;
1258
1259         tmp = smc501_readl(sm->regs + reg);
1260         tmp &= ~r->mask;
1261         tmp |= r->set;
1262         smc501_writel(tmp, sm->regs + reg);
1263 }
1264
1265 /* sm501_init_regs
1266  *
1267  * Setup core register values
1268 */
1269
1270 static void sm501_init_regs(struct sm501_devdata *sm,
1271                             struct sm501_initdata *init)
1272 {
1273         sm501_misc_control(sm->dev,
1274                            init->misc_control.set,
1275                            init->misc_control.mask);
1276
1277         sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1278         sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1279         sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1280
1281         if (init->m1xclk) {
1282                 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1283                 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1284         }
1285
1286         if (init->mclk) {
1287                 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1288                 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1289         }
1290
1291 }
1292
1293 /* Check the PLL sources for the M1CLK and M1XCLK
1294  *
1295  * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1296  * there is a risk (see errata AB-5) that the SM501 will cease proper
1297  * function. If this happens, then it is likely the SM501 will
1298  * hang the system.
1299 */
1300
1301 static int sm501_check_clocks(struct sm501_devdata *sm)
1302 {
1303         unsigned long pwrmode = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
1304         unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1305         unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1306
1307         return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1308 }
1309
1310 static unsigned int sm501_mem_local[] = {
1311         [0]     = 4*1024*1024,
1312         [1]     = 8*1024*1024,
1313         [2]     = 16*1024*1024,
1314         [3]     = 32*1024*1024,
1315         [4]     = 64*1024*1024,
1316         [5]     = 2*1024*1024,
1317 };
1318
1319 /* sm501_init_dev
1320  *
1321  * Common init code for an SM501
1322 */
1323
1324 static int __devinit sm501_init_dev(struct sm501_devdata *sm)
1325 {
1326         struct sm501_initdata *idata;
1327         struct sm501_platdata *pdata;
1328         resource_size_t mem_avail;
1329         unsigned long dramctrl;
1330         unsigned long devid;
1331         int ret;
1332
1333         mutex_init(&sm->clock_lock);
1334         spin_lock_init(&sm->reg_lock);
1335
1336         INIT_LIST_HEAD(&sm->devices);
1337
1338         devid = smc501_readl(sm->regs + SM501_DEVICEID);
1339
1340         if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1341                 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1342                 return -EINVAL;
1343         }
1344
1345         /* disable irqs */
1346         smc501_writel(0, sm->regs + SM501_IRQ_MASK);
1347
1348         dramctrl = smc501_readl(sm->regs + SM501_DRAM_CONTROL);
1349         mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1350
1351         dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1352                  sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1353
1354         sm->rev = devid & SM501_DEVICEID_REVMASK;
1355
1356         sm501_dump_gate(sm);
1357
1358         ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1359         if (ret)
1360                 dev_err(sm->dev, "failed to create debug regs file\n");
1361
1362         sm501_dump_clk(sm);
1363
1364         /* check to see if we have some device initialisation */
1365
1366         pdata = sm->platdata;
1367         idata = pdata ? pdata->init : NULL;
1368
1369         if (idata) {
1370                 sm501_init_regs(sm, idata);
1371
1372                 if (idata->devices & SM501_USE_USB_HOST)
1373                         sm501_register_usbhost(sm, &mem_avail);
1374                 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1375                         sm501_register_uart(sm, idata->devices);
1376                 if (idata->devices & SM501_USE_GPIO)
1377                         sm501_register_gpio(sm);
1378         }
1379
1380         if (pdata && pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1381                 if (!sm501_gpio_isregistered(sm))
1382                         dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1383                 else
1384                         sm501_register_gpio_i2c(sm, pdata);
1385         }
1386
1387         ret = sm501_check_clocks(sm);
1388         if (ret) {
1389                 dev_err(sm->dev, "M1X and M clocks sourced from different "
1390                                         "PLLs\n");
1391                 return -EINVAL;
1392         }
1393
1394         /* always create a framebuffer */
1395         sm501_register_display(sm, &mem_avail);
1396
1397         return 0;
1398 }
1399
1400 static int __devinit sm501_plat_probe(struct platform_device *dev)
1401 {
1402         struct sm501_devdata *sm;
1403         int ret;
1404
1405         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1406         if (sm == NULL) {
1407                 dev_err(&dev->dev, "no memory for device data\n");
1408                 ret = -ENOMEM;
1409                 goto err1;
1410         }
1411
1412         sm->dev = &dev->dev;
1413         sm->pdev_id = dev->id;
1414         sm->platdata = dev->dev.platform_data;
1415
1416         ret = platform_get_irq(dev, 0);
1417         if (ret < 0) {
1418                 dev_err(&dev->dev, "failed to get irq resource\n");
1419                 goto err_res;
1420         }
1421         sm->irq = ret;
1422
1423         sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1424         sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1425
1426         if (sm->io_res == NULL || sm->mem_res == NULL) {
1427                 dev_err(&dev->dev, "failed to get IO resource\n");
1428                 ret = -ENOENT;
1429                 goto err_res;
1430         }
1431
1432         sm->regs_claim = request_mem_region(sm->io_res->start,
1433                                             0x100, "sm501");
1434
1435         if (sm->regs_claim == NULL) {
1436                 dev_err(&dev->dev, "cannot claim registers\n");
1437                 ret = -EBUSY;
1438                 goto err_res;
1439         }
1440
1441         platform_set_drvdata(dev, sm);
1442
1443         sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
1444
1445         if (sm->regs == NULL) {
1446                 dev_err(&dev->dev, "cannot remap registers\n");
1447                 ret = -EIO;
1448                 goto err_claim;
1449         }
1450
1451         return sm501_init_dev(sm);
1452
1453  err_claim:
1454         release_resource(sm->regs_claim);
1455         kfree(sm->regs_claim);
1456  err_res:
1457         kfree(sm);
1458  err1:
1459         return ret;
1460
1461 }
1462
1463 #ifdef CONFIG_PM
1464
1465 /* power management support */
1466
1467 static void sm501_set_power(struct sm501_devdata *sm, int on)
1468 {
1469         struct sm501_platdata *pd = sm->platdata;
1470
1471         if (pd == NULL)
1472                 return;
1473
1474         if (pd->get_power) {
1475                 if (pd->get_power(sm->dev) == on) {
1476                         dev_dbg(sm->dev, "is already %d\n", on);
1477                         return;
1478                 }
1479         }
1480
1481         if (pd->set_power) {
1482                 dev_dbg(sm->dev, "setting power to %d\n", on);
1483
1484                 pd->set_power(sm->dev, on);
1485                 sm501_mdelay(sm, 10);
1486         }
1487 }
1488
1489 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1490 {
1491         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1492
1493         sm->in_suspend = 1;
1494         sm->pm_misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
1495
1496         sm501_dump_regs(sm);
1497
1498         if (sm->platdata) {
1499                 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1500                         sm501_set_power(sm, 0);
1501         }
1502
1503         return 0;
1504 }
1505
1506 static int sm501_plat_resume(struct platform_device *pdev)
1507 {
1508         struct sm501_devdata *sm = platform_get_drvdata(pdev);
1509
1510         sm501_set_power(sm, 1);
1511
1512         sm501_dump_regs(sm);
1513         sm501_dump_gate(sm);
1514         sm501_dump_clk(sm);
1515
1516         /* check to see if we are in the same state as when suspended */
1517
1518         if (smc501_readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1519                 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1520                 smc501_writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1521
1522                 /* our suspend causes the controller state to change,
1523                  * either by something attempting setup, power loss,
1524                  * or an external reset event on power change */
1525
1526                 if (sm->platdata && sm->platdata->init) {
1527                         sm501_init_regs(sm, sm->platdata->init);
1528                 }
1529         }
1530
1531         /* dump our state from resume */
1532
1533         sm501_dump_regs(sm);
1534         sm501_dump_clk(sm);
1535
1536         sm->in_suspend = 0;
1537
1538         return 0;
1539 }
1540 #else
1541 #define sm501_plat_suspend NULL
1542 #define sm501_plat_resume NULL
1543 #endif
1544
1545 /* Initialisation data for PCI devices */
1546
1547 static struct sm501_initdata sm501_pci_initdata = {
1548         .gpio_high      = {
1549                 .set    = 0x3F000000,           /* 24bit panel */
1550                 .mask   = 0x0,
1551         },
1552         .misc_timing    = {
1553                 .set    = 0x010100,             /* SDRAM timing */
1554                 .mask   = 0x1F1F00,
1555         },
1556         .misc_control   = {
1557                 .set    = SM501_MISC_PNL_24BIT,
1558                 .mask   = 0,
1559         },
1560
1561         .devices        = SM501_USE_ALL,
1562
1563         /* Errata AB-3 says that 72MHz is the fastest available
1564          * for 33MHZ PCI with proper bus-mastering operation */
1565
1566         .mclk           = 72 * MHZ,
1567         .m1xclk         = 144 * MHZ,
1568 };
1569
1570 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1571         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
1572                            SM501FB_FLAG_USE_HWCURSOR |
1573                            SM501FB_FLAG_USE_HWACCEL |
1574                            SM501FB_FLAG_DISABLE_AT_EXIT),
1575 };
1576
1577 static struct sm501_platdata_fb sm501_fb_pdata = {
1578         .fb_route       = SM501_FB_OWN,
1579         .fb_crt         = &sm501_pdata_fbsub,
1580         .fb_pnl         = &sm501_pdata_fbsub,
1581 };
1582
1583 static struct sm501_platdata sm501_pci_platdata = {
1584         .init           = &sm501_pci_initdata,
1585         .fb             = &sm501_fb_pdata,
1586         .gpio_base      = -1,
1587 };
1588
1589 static int __devinit sm501_pci_probe(struct pci_dev *dev,
1590                                      const struct pci_device_id *id)
1591 {
1592         struct sm501_devdata *sm;
1593         int err;
1594
1595         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1596         if (sm == NULL) {
1597                 dev_err(&dev->dev, "no memory for device data\n");
1598                 err = -ENOMEM;
1599                 goto err1;
1600         }
1601
1602         /* set a default set of platform data */
1603         dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1604
1605         /* set a hopefully unique id for our child platform devices */
1606         sm->pdev_id = 32 + dev->devfn;
1607
1608         pci_set_drvdata(dev, sm);
1609
1610         err = pci_enable_device(dev);
1611         if (err) {
1612                 dev_err(&dev->dev, "cannot enable device\n");
1613                 goto err2;
1614         }
1615
1616         sm->dev = &dev->dev;
1617         sm->irq = dev->irq;
1618
1619 #ifdef __BIG_ENDIAN
1620         /* if the system is big-endian, we most probably have a
1621          * translation in the IO layer making the PCI bus little endian
1622          * so make the framebuffer swapped pixels */
1623
1624         sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1625 #endif
1626
1627         /* check our resources */
1628
1629         if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1630                 dev_err(&dev->dev, "region #0 is not memory?\n");
1631                 err = -EINVAL;
1632                 goto err3;
1633         }
1634
1635         if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1636                 dev_err(&dev->dev, "region #1 is not memory?\n");
1637                 err = -EINVAL;
1638                 goto err3;
1639         }
1640
1641         /* make our resources ready for sharing */
1642
1643         sm->io_res = &dev->resource[1];
1644         sm->mem_res = &dev->resource[0];
1645
1646         sm->regs_claim = request_mem_region(sm->io_res->start,
1647                                             0x100, "sm501");
1648         if (sm->regs_claim == NULL) {
1649                 dev_err(&dev->dev, "cannot claim registers\n");
1650                 err= -EBUSY;
1651                 goto err3;
1652         }
1653
1654         sm->regs = pci_ioremap_bar(dev, 1);
1655
1656         if (sm->regs == NULL) {
1657                 dev_err(&dev->dev, "cannot remap registers\n");
1658                 err = -EIO;
1659                 goto err4;
1660         }
1661
1662         sm501_init_dev(sm);
1663         return 0;
1664
1665  err4:
1666         release_resource(sm->regs_claim);
1667         kfree(sm->regs_claim);
1668  err3:
1669         pci_disable_device(dev);
1670  err2:
1671         pci_set_drvdata(dev, NULL);
1672         kfree(sm);
1673  err1:
1674         return err;
1675 }
1676
1677 static void sm501_remove_sub(struct sm501_devdata *sm,
1678                              struct sm501_device *smdev)
1679 {
1680         list_del(&smdev->list);
1681         platform_device_unregister(&smdev->pdev);
1682 }
1683
1684 static void sm501_dev_remove(struct sm501_devdata *sm)
1685 {
1686         struct sm501_device *smdev, *tmp;
1687
1688         list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1689                 sm501_remove_sub(sm, smdev);
1690
1691         device_remove_file(sm->dev, &dev_attr_dbg_regs);
1692
1693         sm501_gpio_remove(sm);
1694 }
1695
1696 static void __devexit sm501_pci_remove(struct pci_dev *dev)
1697 {
1698         struct sm501_devdata *sm = pci_get_drvdata(dev);
1699
1700         sm501_dev_remove(sm);
1701         iounmap(sm->regs);
1702
1703         release_resource(sm->regs_claim);
1704         kfree(sm->regs_claim);
1705
1706         pci_set_drvdata(dev, NULL);
1707         pci_disable_device(dev);
1708 }
1709
1710 static int sm501_plat_remove(struct platform_device *dev)
1711 {
1712         struct sm501_devdata *sm = platform_get_drvdata(dev);
1713
1714         sm501_dev_remove(sm);
1715         iounmap(sm->regs);
1716
1717         release_resource(sm->regs_claim);
1718         kfree(sm->regs_claim);
1719
1720         return 0;
1721 }
1722
1723 static struct pci_device_id sm501_pci_tbl[] = {
1724         { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1725         { 0, },
1726 };
1727
1728 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1729
1730 static struct pci_driver sm501_pci_driver = {
1731         .name           = "sm501",
1732         .id_table       = sm501_pci_tbl,
1733         .probe          = sm501_pci_probe,
1734         .remove         = __devexit_p(sm501_pci_remove),
1735 };
1736
1737 MODULE_ALIAS("platform:sm501");
1738
1739 static struct of_device_id __devinitdata of_sm501_match_tbl[] = {
1740         { .compatible = "smi,sm501", },
1741         { /* end */ }
1742 };
1743
1744 static struct platform_driver sm501_plat_driver = {
1745         .driver         = {
1746                 .name   = "sm501",
1747                 .owner  = THIS_MODULE,
1748                 .of_match_table = of_sm501_match_tbl,
1749         },
1750         .probe          = sm501_plat_probe,
1751         .remove         = sm501_plat_remove,
1752         .suspend        = sm501_plat_suspend,
1753         .resume         = sm501_plat_resume,
1754 };
1755
1756 static int __init sm501_base_init(void)
1757 {
1758         platform_driver_register(&sm501_plat_driver);
1759         return pci_register_driver(&sm501_pci_driver);
1760 }
1761
1762 static void __exit sm501_base_exit(void)
1763 {
1764         platform_driver_unregister(&sm501_plat_driver);
1765         pci_unregister_driver(&sm501_pci_driver);
1766 }
1767
1768 module_init(sm501_base_init);
1769 module_exit(sm501_base_exit);
1770
1771 MODULE_DESCRIPTION("SM501 Core Driver");
1772 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1773 MODULE_LICENSE("GPL v2");