b0b4458ae90b7adea36b371a72957b59c4a57578
[sfrench/cifs-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
23 #include <linux/sm501.h>
24 #include <linux/sm501-regs.h>
25
26 #include <asm/io.h>
27
28 struct sm501_device {
29         struct list_head                list;
30         struct platform_device          pdev;
31 };
32
33 struct sm501_devdata {
34         spinlock_t                       reg_lock;
35         struct mutex                     clock_lock;
36         struct list_head                 devices;
37
38         struct device                   *dev;
39         struct resource                 *io_res;
40         struct resource                 *mem_res;
41         struct resource                 *regs_claim;
42         struct sm501_platdata           *platdata;
43
44         int                              unit_power[20];
45         unsigned int                     pdev_id;
46         unsigned int                     irq;
47         void __iomem                    *regs;
48 };
49
50 #define MHZ (1000 * 1000)
51
52 #ifdef DEBUG
53 static const unsigned int misc_div[] = {
54         [0]             = 1,
55         [1]             = 2,
56         [2]             = 4,
57         [3]             = 8,
58         [4]             = 16,
59         [5]             = 32,
60         [6]             = 64,
61         [7]             = 128,
62         [8]             = 3,
63         [9]             = 6,
64         [10]            = 12,
65         [11]            = 24,
66         [12]            = 48,
67         [13]            = 96,
68         [14]            = 192,
69         [15]            = 384,
70 };
71
72 static const unsigned int px_div[] = {
73         [0]             = 1,
74         [1]             = 2,
75         [2]             = 4,
76         [3]             = 8,
77         [4]             = 16,
78         [5]             = 32,
79         [6]             = 64,
80         [7]             = 128,
81         [8]             = 3,
82         [9]             = 6,
83         [10]            = 12,
84         [11]            = 24,
85         [12]            = 48,
86         [13]            = 96,
87         [14]            = 192,
88         [15]            = 384,
89         [16]            = 5,
90         [17]            = 10,
91         [18]            = 20,
92         [19]            = 40,
93         [20]            = 80,
94         [21]            = 160,
95         [22]            = 320,
96         [23]            = 604,
97 };
98
99 static unsigned long decode_div(unsigned long pll2, unsigned long val,
100                                 unsigned int lshft, unsigned int selbit,
101                                 unsigned long mask, const unsigned int *dtab)
102 {
103         if (val & selbit)
104                 pll2 = 288 * MHZ;
105
106         return pll2 / dtab[(val >> lshft) & mask];
107 }
108
109 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
110
111 /* sm501_dump_clk
112  *
113  * Print out the current clock configuration for the device
114 */
115
116 static void sm501_dump_clk(struct sm501_devdata *sm)
117 {
118         unsigned long misct = readl(sm->regs + SM501_MISC_TIMING);
119         unsigned long pm0 = readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
120         unsigned long pm1 = readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
121         unsigned long pmc = readl(sm->regs + SM501_POWER_MODE_CONTROL);
122         unsigned long sdclk0, sdclk1;
123         unsigned long pll2 = 0;
124
125         switch (misct & 0x30) {
126         case 0x00:
127                 pll2 = 336 * MHZ;
128                 break;
129         case 0x10:
130                 pll2 = 288 * MHZ;
131                 break;
132         case 0x20:
133                 pll2 = 240 * MHZ;
134                 break;
135         case 0x30:
136                 pll2 = 192 * MHZ;
137                 break;
138         }
139
140         sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
141         sdclk0 /= misc_div[((misct >> 8) & 0xf)];
142
143         sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
144         sdclk1 /= misc_div[((misct >> 16) & 0xf)];
145
146         dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
147                 misct, pm0, pm1);
148
149         dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
150                 fmt_freq(pll2), sdclk0, sdclk1);
151
152         dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
153
154         dev_dbg(sm->dev, "PM0[%c]: "
155                  "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
156 x                "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
157                  (pmc & 3 ) == 0 ? '*' : '-',
158                  fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31, px_div)),
159                  fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15, misc_div)),
160                  fmt_freq(decode_div(pll2, pm0, 8,  1<<12, 15, misc_div)),
161                  fmt_freq(decode_div(pll2, pm0, 0,  1<<4,  15, misc_div)));
162
163         dev_dbg(sm->dev, "PM1[%c]: "
164                 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
165                 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
166                 (pmc & 3 ) == 1 ? '*' : '-',
167                 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31, px_div)),
168                 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15, misc_div)),
169                 fmt_freq(decode_div(pll2, pm1, 8,  1<<12, 15, misc_div)),
170                 fmt_freq(decode_div(pll2, pm1, 0,  1<<4,  15, misc_div)));
171 }
172 #else
173 static void sm501_dump_clk(struct sm501_devdata *sm)
174 {
175 }
176 #endif
177
178 /* sm501_sync_regs
179  *
180  * ensure the
181 */
182
183 static void sm501_sync_regs(struct sm501_devdata *sm)
184 {
185         readl(sm->regs);
186 }
187
188 /* sm501_misc_control
189  *
190  * alters the misceleneous control parameters
191 */
192
193 int sm501_misc_control(struct device *dev,
194                        unsigned long set, unsigned long clear)
195 {
196         struct sm501_devdata *sm = dev_get_drvdata(dev);
197         unsigned long misc;
198         unsigned long save;
199         unsigned long to;
200
201         spin_lock_irqsave(&sm->reg_lock, save);
202
203         misc = readl(sm->regs + SM501_MISC_CONTROL);
204         to = (misc & ~clear) | set;
205
206         if (to != misc) {
207                 writel(to, sm->regs + SM501_MISC_CONTROL);
208                 sm501_sync_regs(sm);
209
210                 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
211         }
212
213         spin_unlock_irqrestore(&sm->reg_lock, save);
214         return to;
215 }
216
217 EXPORT_SYMBOL_GPL(sm501_misc_control);
218
219 /* sm501_modify_reg
220  *
221  * Modify a register in the SM501 which may be shared with other
222  * drivers.
223 */
224
225 unsigned long sm501_modify_reg(struct device *dev,
226                                unsigned long reg,
227                                unsigned long set,
228                                unsigned long clear)
229 {
230         struct sm501_devdata *sm = dev_get_drvdata(dev);
231         unsigned long data;
232         unsigned long save;
233
234         spin_lock_irqsave(&sm->reg_lock, save);
235
236         data = readl(sm->regs + reg);
237         data |= set;
238         data &= ~clear;
239
240         writel(data, sm->regs + reg);
241         sm501_sync_regs(sm);
242
243         spin_unlock_irqrestore(&sm->reg_lock, save);
244
245         return data;
246 }
247
248 EXPORT_SYMBOL_GPL(sm501_modify_reg);
249
250 unsigned long sm501_gpio_get(struct device *dev,
251                              unsigned long gpio)
252 {
253         struct sm501_devdata *sm = dev_get_drvdata(dev);
254         unsigned long result;
255         unsigned long reg;
256
257         reg = (gpio > 32) ? SM501_GPIO_DATA_HIGH : SM501_GPIO_DATA_LOW;
258         result = readl(sm->regs + reg);
259
260         result >>= (gpio & 31);
261         return result & 1UL;
262 }
263
264 EXPORT_SYMBOL_GPL(sm501_gpio_get);
265
266 void sm501_gpio_set(struct device *dev,
267                     unsigned long gpio,
268                     unsigned int to,
269                     unsigned int dir)
270 {
271         struct sm501_devdata *sm = dev_get_drvdata(dev);
272
273         unsigned long bit = 1 << (gpio & 31);
274         unsigned long base;
275         unsigned long save;
276         unsigned long val;
277
278         base = (gpio > 32) ? SM501_GPIO_DATA_HIGH : SM501_GPIO_DATA_LOW;
279         base += SM501_GPIO;
280
281         spin_lock_irqsave(&sm->reg_lock, save);
282
283         val = readl(sm->regs + base) & ~bit;
284         if (to)
285                 val |= bit;
286         writel(val, sm->regs + base);
287
288         val = readl(sm->regs + SM501_GPIO_DDR_LOW) & ~bit;
289         if (dir)
290                 val |= bit;
291
292         writel(val, sm->regs + SM501_GPIO_DDR_LOW);
293         sm501_sync_regs(sm);
294
295         spin_unlock_irqrestore(&sm->reg_lock, save);
296
297 }
298
299 EXPORT_SYMBOL_GPL(sm501_gpio_set);
300
301
302 /* sm501_unit_power
303  *
304  * alters the power active gate to set specific units on or off
305  */
306
307 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
308 {
309         struct sm501_devdata *sm = dev_get_drvdata(dev);
310         unsigned long mode;
311         unsigned long gate;
312         unsigned long clock;
313
314         mutex_lock(&sm->clock_lock);
315
316         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
317         gate = readl(sm->regs + SM501_CURRENT_GATE);
318         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
319
320         mode &= 3;              /* get current power mode */
321
322         if (unit >= ARRAY_SIZE(sm->unit_power)) {
323                 dev_err(dev, "%s: bad unit %d\n", __FUNCTION__, unit);
324                 goto already;
325         }
326
327         dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __FUNCTION__, unit,
328                 sm->unit_power[unit], to);
329
330         if (to == 0 && sm->unit_power[unit] == 0) {
331                 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
332                 goto already;
333         }
334
335         sm->unit_power[unit] += to ? 1 : -1;
336         to = sm->unit_power[unit] ? 1 : 0;
337
338         if (to) {
339                 if (gate & (1 << unit))
340                         goto already;
341                 gate |= (1 << unit);
342         } else {
343                 if (!(gate & (1 << unit)))
344                         goto already;
345                 gate &= ~(1 << unit);
346         }
347
348         switch (mode) {
349         case 1:
350                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
351                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
352                 mode = 0;
353                 break;
354         case 2:
355         case 0:
356                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
357                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
358                 mode = 1;
359                 break;
360
361         default:
362                 return -1;
363         }
364
365         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
366         sm501_sync_regs(sm);
367
368         dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
369                 gate, clock, mode);
370
371         msleep(16);
372
373  already:
374         mutex_unlock(&sm->clock_lock);
375         return gate;
376 }
377
378 EXPORT_SYMBOL_GPL(sm501_unit_power);
379
380
381 /* Perform a rounded division. */
382 static long sm501fb_round_div(long num, long denom)
383 {
384         /* n / d + 1 / 2 = (2n + d) / 2d */
385         return (2 * num + denom) / (2 * denom);
386 }
387
388 /* clock value structure. */
389 struct sm501_clock {
390         unsigned long mclk;
391         int divider;
392         int shift;
393 };
394
395 /* sm501_select_clock
396  *
397  * selects nearest discrete clock frequency the SM501 can achive
398  *   the maximum divisor is 3 or 5
399  */
400 static unsigned long sm501_select_clock(unsigned long freq,
401                                         struct sm501_clock *clock,
402                                         int max_div)
403 {
404         unsigned long mclk;
405         int divider;
406         int shift;
407         long diff;
408         long best_diff = 999999999;
409
410         /* Try 288MHz and 336MHz clocks. */
411         for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
412                 /* try dividers 1 and 3 for CRT and for panel,
413                    try divider 5 for panel only.*/
414
415                 for (divider = 1; divider <= max_div; divider += 2) {
416                         /* try all 8 shift values.*/
417                         for (shift = 0; shift < 8; shift++) {
418                                 /* Calculate difference to requested clock */
419                                 diff = sm501fb_round_div(mclk, divider << shift) - freq;
420                                 if (diff < 0)
421                                         diff = -diff;
422
423                                 /* If it is less than the current, use it */
424                                 if (diff < best_diff) {
425                                         best_diff = diff;
426
427                                         clock->mclk = mclk;
428                                         clock->divider = divider;
429                                         clock->shift = shift;
430                                 }
431                         }
432                 }
433         }
434
435         /* Return best clock. */
436         return clock->mclk / (clock->divider << clock->shift);
437 }
438
439 /* sm501_set_clock
440  *
441  * set one of the four clock sources to the closest available frequency to
442  *  the one specified
443 */
444
445 unsigned long sm501_set_clock(struct device *dev,
446                               int clksrc,
447                               unsigned long req_freq)
448 {
449         struct sm501_devdata *sm = dev_get_drvdata(dev);
450         unsigned long mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
451         unsigned long gate = readl(sm->regs + SM501_CURRENT_GATE);
452         unsigned long clock = readl(sm->regs + SM501_CURRENT_CLOCK);
453         unsigned char reg;
454         unsigned long sm501_freq; /* the actual frequency acheived */
455
456         struct sm501_clock to;
457
458         /* find achivable discrete frequency and setup register value
459          * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
460          * has an extra bit for the divider */
461
462         switch (clksrc) {
463         case SM501_CLOCK_P2XCLK:
464                 /* This clock is divided in half so to achive the
465                  * requested frequency the value must be multiplied by
466                  * 2. This clock also has an additional pre divisor */
467
468                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 5) / 2);
469                 reg=to.shift & 0x07;/* bottom 3 bits are shift */
470                 if (to.divider == 3)
471                         reg |= 0x08; /* /3 divider required */
472                 else if (to.divider == 5)
473                         reg |= 0x10; /* /5 divider required */
474                 if (to.mclk != 288000000)
475                         reg |= 0x20; /* which mclk pll is source */
476                 break;
477
478         case SM501_CLOCK_V2XCLK:
479                 /* This clock is divided in half so to achive the
480                  * requested frequency the value must be multiplied by 2. */
481
482                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
483                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
484                 if (to.divider == 3)
485                         reg |= 0x08;    /* /3 divider required */
486                 if (to.mclk != 288000000)
487                         reg |= 0x10;    /* which mclk pll is source */
488                 break;
489
490         case SM501_CLOCK_MCLK:
491         case SM501_CLOCK_M1XCLK:
492                 /* These clocks are the same and not further divided */
493
494                 sm501_freq = sm501_select_clock( req_freq, &to, 3);
495                 reg=to.shift & 0x07;    /* bottom 3 bits are shift */
496                 if (to.divider == 3)
497                         reg |= 0x08;    /* /3 divider required */
498                 if (to.mclk != 288000000)
499                         reg |= 0x10;    /* which mclk pll is source */
500                 break;
501
502         default:
503                 return 0; /* this is bad */
504         }
505
506         mutex_lock(&sm->clock_lock);
507
508         mode = readl(sm->regs + SM501_POWER_MODE_CONTROL);
509         gate = readl(sm->regs + SM501_CURRENT_GATE);
510         clock = readl(sm->regs + SM501_CURRENT_CLOCK);
511
512         clock = clock & ~(0xFF << clksrc);
513         clock |= reg<<clksrc;
514
515         mode &= 3;      /* find current mode */
516
517         switch (mode) {
518         case 1:
519                 writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
520                 writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
521                 mode = 0;
522                 break;
523         case 2:
524         case 0:
525                 writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
526                 writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
527                 mode = 1;
528                 break;
529
530         default:
531                 mutex_unlock(&sm->clock_lock);
532                 return -1;
533         }
534
535         writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
536         sm501_sync_regs(sm);
537
538         dev_info(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
539                  gate, clock, mode);
540
541         msleep(16);
542         mutex_unlock(&sm->clock_lock);
543
544         sm501_dump_clk(sm);
545
546         return sm501_freq;
547 }
548
549 EXPORT_SYMBOL_GPL(sm501_set_clock);
550
551 /* sm501_find_clock
552  *
553  * finds the closest available frequency for a given clock
554 */
555
556 unsigned long sm501_find_clock(int clksrc,
557                                unsigned long req_freq)
558 {
559         unsigned long sm501_freq; /* the frequency achiveable by the 501 */
560         struct sm501_clock to;
561
562         switch (clksrc) {
563         case SM501_CLOCK_P2XCLK:
564                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 5) / 2);
565                 break;
566
567         case SM501_CLOCK_V2XCLK:
568                 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
569                 break;
570
571         case SM501_CLOCK_MCLK:
572         case SM501_CLOCK_M1XCLK:
573                 sm501_freq = sm501_select_clock(req_freq, &to, 3);
574                 break;
575
576         default:
577                 sm501_freq = 0;         /* error */
578         }
579
580         return sm501_freq;
581 }
582
583 EXPORT_SYMBOL_GPL(sm501_find_clock);
584
585 static struct sm501_device *to_sm_device(struct platform_device *pdev)
586 {
587         return container_of(pdev, struct sm501_device, pdev);
588 }
589
590 /* sm501_device_release
591  *
592  * A release function for the platform devices we create to allow us to
593  * free any items we allocated
594 */
595
596 static void sm501_device_release(struct device *dev)
597 {
598         kfree(to_sm_device(to_platform_device(dev)));
599 }
600
601 /* sm501_create_subdev
602  *
603  * Create a skeleton platform device with resources for passing to a
604  * sub-driver
605 */
606
607 static struct platform_device *
608 sm501_create_subdev(struct sm501_devdata *sm,
609                     char *name, unsigned int res_count)
610 {
611         struct sm501_device *smdev;
612
613         smdev = kzalloc(sizeof(struct sm501_device) +
614                         sizeof(struct resource) * res_count, GFP_KERNEL);
615         if (!smdev)
616                 return NULL;
617
618         smdev->pdev.dev.release = sm501_device_release;
619
620         smdev->pdev.name = name;
621         smdev->pdev.id = sm->pdev_id;
622         smdev->pdev.resource = (struct resource *)(smdev+1);
623         smdev->pdev.num_resources = res_count;
624
625         smdev->pdev.dev.parent = sm->dev;
626
627         return &smdev->pdev;
628 }
629
630 /* sm501_register_device
631  *
632  * Register a platform device created with sm501_create_subdev()
633 */
634
635 static int sm501_register_device(struct sm501_devdata *sm,
636                                  struct platform_device *pdev)
637 {
638         struct sm501_device *smdev = to_sm_device(pdev);
639         int ptr;
640         int ret;
641
642         for (ptr = 0; ptr < pdev->num_resources; ptr++) {
643                 printk("%s[%d] flags %08lx: %08llx..%08llx\n",
644                        pdev->name, ptr,
645                        pdev->resource[ptr].flags,
646                        (unsigned long long)pdev->resource[ptr].start,
647                        (unsigned long long)pdev->resource[ptr].end);
648         }
649
650         ret = platform_device_register(pdev);
651
652         if (ret >= 0) {
653                 dev_dbg(sm->dev, "registered %s\n", pdev->name);
654                 list_add_tail(&smdev->list, &sm->devices);
655         } else
656                 dev_err(sm->dev, "error registering %s (%d)\n",
657                         pdev->name, ret);
658
659         return ret;
660 }
661
662 /* sm501_create_subio
663  *
664  * Fill in an IO resource for a sub device
665 */
666
667 static void sm501_create_subio(struct sm501_devdata *sm,
668                                struct resource *res,
669                                resource_size_t offs,
670                                resource_size_t size)
671 {
672         res->flags = IORESOURCE_MEM;
673         res->parent = sm->io_res;
674         res->start = sm->io_res->start + offs;
675         res->end = res->start + size - 1;
676 }
677
678 /* sm501_create_mem
679  *
680  * Fill in an MEM resource for a sub device
681 */
682
683 static void sm501_create_mem(struct sm501_devdata *sm,
684                              struct resource *res,
685                              resource_size_t *offs,
686                              resource_size_t size)
687 {
688         *offs -= size;          /* adjust memory size */
689
690         res->flags = IORESOURCE_MEM;
691         res->parent = sm->mem_res;
692         res->start = sm->mem_res->start + *offs;
693         res->end = res->start + size - 1;
694 }
695
696 /* sm501_create_irq
697  *
698  * Fill in an IRQ resource for a sub device
699 */
700
701 static void sm501_create_irq(struct sm501_devdata *sm,
702                              struct resource *res)
703 {
704         res->flags = IORESOURCE_IRQ;
705         res->parent = NULL;
706         res->start = res->end = sm->irq;
707 }
708
709 static int sm501_register_usbhost(struct sm501_devdata *sm,
710                                   resource_size_t *mem_avail)
711 {
712         struct platform_device *pdev;
713
714         pdev = sm501_create_subdev(sm, "sm501-usb", 3);
715         if (!pdev)
716                 return -ENOMEM;
717
718         sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
719         sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
720         sm501_create_irq(sm, &pdev->resource[2]);
721
722         return sm501_register_device(sm, pdev);
723 }
724
725 static int sm501_register_display(struct sm501_devdata *sm,
726                                   resource_size_t *mem_avail)
727 {
728         struct platform_device *pdev;
729
730         pdev = sm501_create_subdev(sm, "sm501-fb", 4);
731         if (!pdev)
732                 return -ENOMEM;
733
734         sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
735         sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
736         sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
737         sm501_create_irq(sm, &pdev->resource[3]);
738
739         return sm501_register_device(sm, pdev);
740 }
741
742 /* sm501_dbg_regs
743  *
744  * Debug attribute to attach to parent device to show core registers
745 */
746
747 static ssize_t sm501_dbg_regs(struct device *dev,
748                               struct device_attribute *attr, char *buff)
749 {
750         struct sm501_devdata *sm = dev_get_drvdata(dev) ;
751         unsigned int reg;
752         char *ptr = buff;
753         int ret;
754
755         for (reg = 0x00; reg < 0x70; reg += 4) {
756                 ret = sprintf(ptr, "%08x = %08x\n",
757                               reg, readl(sm->regs + reg));
758                 ptr += ret;
759         }
760
761         return ptr - buff;
762 }
763
764
765 static DEVICE_ATTR(dbg_regs, 0666, sm501_dbg_regs, NULL);
766
767 /* sm501_init_reg
768  *
769  * Helper function for the init code to setup a register
770 */
771
772 static inline void sm501_init_reg(struct sm501_devdata *sm,
773                                   unsigned long reg,
774                                   struct sm501_reg_init *r)
775 {
776         unsigned long tmp;
777
778         tmp = readl(sm->regs + reg);
779         tmp |= r->set;
780         tmp &= ~r->mask;
781         writel(tmp, sm->regs + reg);
782 }
783
784 /* sm501_init_regs
785  *
786  * Setup core register values
787 */
788
789 static void sm501_init_regs(struct sm501_devdata *sm,
790                             struct sm501_initdata *init)
791 {
792         sm501_misc_control(sm->dev,
793                            init->misc_control.set,
794                            init->misc_control.mask);
795
796         sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
797         sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
798         sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
799
800         if (init->mclk) {
801                 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
802                 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
803         }
804
805         if (init->m1xclk) {
806                 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
807                 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
808         }
809 }
810
811 static unsigned int sm501_mem_local[] = {
812         [0]     = 4*1024*1024,
813         [1]     = 8*1024*1024,
814         [2]     = 16*1024*1024,
815         [3]     = 32*1024*1024,
816         [4]     = 64*1024*1024,
817         [5]     = 2*1024*1024,
818 };
819
820 /* sm501_init_dev
821  *
822  * Common init code for an SM501
823 */
824
825 static int sm501_init_dev(struct sm501_devdata *sm)
826 {
827         resource_size_t mem_avail;
828         unsigned long dramctrl;
829         int ret;
830
831         mutex_init(&sm->clock_lock);
832         spin_lock_init(&sm->reg_lock);
833
834         INIT_LIST_HEAD(&sm->devices);
835
836         dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
837
838         mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
839
840         dev_info(sm->dev, "SM501 At %p: Version %08x, %ld Mb, IRQ %d\n",
841                  sm->regs, readl(sm->regs + SM501_DEVICEID),
842                  (unsigned long)mem_avail >> 20, sm->irq);
843
844         dev_info(sm->dev, "CurrentGate      %08x\n", readl(sm->regs+0x38));
845         dev_info(sm->dev, "CurrentClock     %08x\n", readl(sm->regs+0x3c));
846         dev_info(sm->dev, "PowerModeControl %08x\n", readl(sm->regs+0x54));
847
848         ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
849         if (ret)
850                 dev_err(sm->dev, "failed to create debug regs file\n");
851
852         sm501_dump_clk(sm);
853
854         /* check to see if we have some device initialisation */
855
856         if (sm->platdata) {
857                 struct sm501_platdata *pdata = sm->platdata;
858
859                 if (pdata->init) {
860                         sm501_init_regs(sm, sm->platdata->init);
861
862                         if (pdata->init->devices & SM501_USE_USB_HOST)
863                                 sm501_register_usbhost(sm, &mem_avail);
864                 }
865         }
866
867         /* always create a framebuffer */
868         sm501_register_display(sm, &mem_avail);
869
870         return 0;
871 }
872
873 static int sm501_plat_probe(struct platform_device *dev)
874 {
875         struct sm501_devdata *sm;
876         int err;
877
878         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
879         if (sm == NULL) {
880                 dev_err(&dev->dev, "no memory for device data\n");
881                 err = -ENOMEM;
882                 goto err1;
883         }
884
885         sm->dev = &dev->dev;
886         sm->pdev_id = dev->id;
887         sm->irq = platform_get_irq(dev, 0);
888         sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
889         sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
890         sm->platdata = dev->dev.platform_data;
891
892         if (sm->irq < 0) {
893                 dev_err(&dev->dev, "failed to get irq resource\n");
894                 err = sm->irq;
895                 goto err_res;
896         }
897
898         if (sm->io_res == NULL || sm->mem_res == NULL) {
899                 dev_err(&dev->dev, "failed to get IO resource\n");
900                 err = -ENOENT;
901                 goto err_res;
902         }
903
904         sm->regs_claim = request_mem_region(sm->io_res->start,
905                                             0x100, "sm501");
906
907         if (sm->regs_claim == NULL) {
908                 dev_err(&dev->dev, "cannot claim registers\n");
909                 err= -EBUSY;
910                 goto err_res;
911         }
912
913         platform_set_drvdata(dev, sm);
914
915         sm->regs = ioremap(sm->io_res->start,
916                            (sm->io_res->end - sm->io_res->start) - 1);
917
918         if (sm->regs == NULL) {
919                 dev_err(&dev->dev, "cannot remap registers\n");
920                 err = -EIO;
921                 goto err_claim;
922         }
923
924         return sm501_init_dev(sm);
925
926  err_claim:
927         release_resource(sm->regs_claim);
928         kfree(sm->regs_claim);
929  err_res:
930         kfree(sm);
931  err1:
932         return err;
933
934 }
935
936 /* Initialisation data for PCI devices */
937
938 static struct sm501_initdata sm501_pci_initdata = {
939         .gpio_high      = {
940                 .set    = 0x3F000000,           /* 24bit panel */
941                 .mask   = 0x0,
942         },
943         .misc_timing    = {
944                 .set    = 0x010100,             /* SDRAM timing */
945                 .mask   = 0x1F1F00,
946         },
947         .misc_control   = {
948                 .set    = SM501_MISC_PNL_24BIT,
949                 .mask   = 0,
950         },
951
952         .devices        = SM501_USE_ALL,
953         .mclk           = 100 * MHZ,
954         .m1xclk         = 160 * MHZ,
955 };
956
957 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
958         .flags          = (SM501FB_FLAG_USE_INIT_MODE |
959                            SM501FB_FLAG_USE_HWCURSOR |
960                            SM501FB_FLAG_USE_HWACCEL |
961                            SM501FB_FLAG_DISABLE_AT_EXIT),
962 };
963
964 static struct sm501_platdata_fb sm501_fb_pdata = {
965         .fb_route       = SM501_FB_OWN,
966         .fb_crt         = &sm501_pdata_fbsub,
967         .fb_pnl         = &sm501_pdata_fbsub,
968 };
969
970 static struct sm501_platdata sm501_pci_platdata = {
971         .init           = &sm501_pci_initdata,
972         .fb             = &sm501_fb_pdata,
973 };
974
975 static int sm501_pci_probe(struct pci_dev *dev,
976                            const struct pci_device_id *id)
977 {
978         struct sm501_devdata *sm;
979         int err;
980
981         sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
982         if (sm == NULL) {
983                 dev_err(&dev->dev, "no memory for device data\n");
984                 err = -ENOMEM;
985                 goto err1;
986         }
987
988         /* set a default set of platform data */
989         dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
990
991         /* set a hopefully unique id for our child platform devices */
992         sm->pdev_id = 32 + dev->devfn;
993
994         pci_set_drvdata(dev, sm);
995
996         err = pci_enable_device(dev);
997         if (err) {
998                 dev_err(&dev->dev, "cannot enable device\n");
999                 goto err2;
1000         }
1001
1002         sm->dev = &dev->dev;
1003         sm->irq = dev->irq;
1004
1005 #ifdef __BIG_ENDIAN
1006         /* if the system is big-endian, we most probably have a
1007          * translation in the IO layer making the PCI bus little endian
1008          * so make the framebuffer swapped pixels */
1009
1010         sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1011 #endif
1012
1013         /* check our resources */
1014
1015         if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1016                 dev_err(&dev->dev, "region #0 is not memory?\n");
1017                 err = -EINVAL;
1018                 goto err3;
1019         }
1020
1021         if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1022                 dev_err(&dev->dev, "region #1 is not memory?\n");
1023                 err = -EINVAL;
1024                 goto err3;
1025         }
1026
1027         /* make our resources ready for sharing */
1028
1029         sm->io_res = &dev->resource[1];
1030         sm->mem_res = &dev->resource[0];
1031
1032         sm->regs_claim = request_mem_region(sm->io_res->start,
1033                                             0x100, "sm501");
1034         if (sm->regs_claim == NULL) {
1035                 dev_err(&dev->dev, "cannot claim registers\n");
1036                 err= -EBUSY;
1037                 goto err3;
1038         }
1039
1040         sm->regs = ioremap(pci_resource_start(dev, 1),
1041                            pci_resource_len(dev, 1));
1042
1043         if (sm->regs == NULL) {
1044                 dev_err(&dev->dev, "cannot remap registers\n");
1045                 err = -EIO;
1046                 goto err4;
1047         }
1048
1049         sm501_init_dev(sm);
1050         return 0;
1051
1052  err4:
1053         release_resource(sm->regs_claim);
1054         kfree(sm->regs_claim);
1055  err3:
1056         pci_disable_device(dev);
1057  err2:
1058         pci_set_drvdata(dev, NULL);
1059         kfree(sm);
1060  err1:
1061         return err;
1062 }
1063
1064 static void sm501_remove_sub(struct sm501_devdata *sm,
1065                              struct sm501_device *smdev)
1066 {
1067         list_del(&smdev->list);
1068         platform_device_unregister(&smdev->pdev);
1069 }
1070
1071 static void sm501_dev_remove(struct sm501_devdata *sm)
1072 {
1073         struct sm501_device *smdev, *tmp;
1074
1075         list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1076                 sm501_remove_sub(sm, smdev);
1077
1078         device_remove_file(sm->dev, &dev_attr_dbg_regs);
1079 }
1080
1081 static void sm501_pci_remove(struct pci_dev *dev)
1082 {
1083         struct sm501_devdata *sm = pci_get_drvdata(dev);
1084
1085         sm501_dev_remove(sm);
1086         iounmap(sm->regs);
1087
1088         release_resource(sm->regs_claim);
1089         kfree(sm->regs_claim);
1090
1091         pci_set_drvdata(dev, NULL);
1092         pci_disable_device(dev);
1093 }
1094
1095 static int sm501_plat_remove(struct platform_device *dev)
1096 {
1097         struct sm501_devdata *sm = platform_get_drvdata(dev);
1098
1099         sm501_dev_remove(sm);
1100         iounmap(sm->regs);
1101
1102         release_resource(sm->regs_claim);
1103         kfree(sm->regs_claim);
1104
1105         return 0;
1106 }
1107
1108 static struct pci_device_id sm501_pci_tbl[] = {
1109         { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1110         { 0, },
1111 };
1112
1113 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1114
1115 static struct pci_driver sm501_pci_drv = {
1116         .name           = "sm501",
1117         .id_table       = sm501_pci_tbl,
1118         .probe          = sm501_pci_probe,
1119         .remove         = sm501_pci_remove,
1120 };
1121
1122 static struct platform_driver sm501_plat_drv = {
1123         .driver         = {
1124                 .name   = "sm501",
1125                 .owner  = THIS_MODULE,
1126         },
1127         .probe          = sm501_plat_probe,
1128         .remove         = sm501_plat_remove,
1129 };
1130
1131 static int __init sm501_base_init(void)
1132 {
1133         platform_driver_register(&sm501_plat_drv);
1134         return pci_register_driver(&sm501_pci_drv);
1135 }
1136
1137 static void __exit sm501_base_exit(void)
1138 {
1139         platform_driver_unregister(&sm501_plat_drv);
1140         pci_unregister_driver(&sm501_pci_drv);
1141 }
1142
1143 module_init(sm501_base_init);
1144 module_exit(sm501_base_exit);
1145
1146 MODULE_DESCRIPTION("SM501 Core Driver");
1147 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1148 MODULE_LICENSE("GPL v2");