Merge branch 'master'
[linux-2.6] / arch / arm / mach-sa1100 / generic.c
1 /*
2  * linux/arch/arm/mach-sa1100/generic.c
3  *
4  * Author: Nicolas Pitre
5  *
6  * Code common to all SA11x0 machines.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 #include <linux/config.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/pm.h>
18 #include <linux/cpufreq.h>
19 #include <linux/ioport.h>
20
21 #include <asm/div64.h>
22 #include <asm/hardware.h>
23 #include <asm/system.h>
24 #include <asm/pgtable.h>
25 #include <asm/mach/map.h>
26 #include <asm/irq.h>
27
28 #include "generic.h"
29
30 #define NR_FREQS        16
31
32 /*
33  * This table is setup for a 3.6864MHz Crystal.
34  */
35 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
36          590,   /*  59.0 MHz */
37          737,   /*  73.7 MHz */
38          885,   /*  88.5 MHz */
39         1032,   /* 103.2 MHz */
40         1180,   /* 118.0 MHz */
41         1327,   /* 132.7 MHz */
42         1475,   /* 147.5 MHz */
43         1622,   /* 162.2 MHz */
44         1769,   /* 176.9 MHz */
45         1917,   /* 191.7 MHz */
46         2064,   /* 206.4 MHz */
47         2212,   /* 221.2 MHz */
48         2359,   /* 235.9 MHz */
49         2507,   /* 250.7 MHz */
50         2654,   /* 265.4 MHz */
51         2802    /* 280.2 MHz */
52 };
53
54 #if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
55 /* rounds up(!)  */
56 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
57 {
58         int i;
59
60         khz /= 100;
61
62         for (i = 0; i < NR_FREQS; i++)
63                 if (cclk_frequency_100khz[i] >= khz)
64                         break;
65
66         return i;
67 }
68
69 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
70 {
71         unsigned int freq = 0;
72         if (idx < NR_FREQS)
73                 freq = cclk_frequency_100khz[idx] * 100;
74         return freq;
75 }
76
77
78 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
79  * this platform, anyway.
80  */
81 int sa11x0_verify_speed(struct cpufreq_policy *policy)
82 {
83         unsigned int tmp;
84         if (policy->cpu)
85                 return -EINVAL;
86
87         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
88
89         /* make sure that at least one frequency is within the policy */
90         tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
91         if (tmp > policy->max)
92                 policy->max = tmp;
93
94         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
95
96         return 0;
97 }
98
99 unsigned int sa11x0_getspeed(unsigned int cpu)
100 {
101         if (cpu)
102                 return 0;
103         return cclk_frequency_100khz[PPCR & 0xf] * 100;
104 }
105
106 #else
107 /*
108  * We still need to provide this so building without cpufreq works.
109  */ 
110 unsigned int cpufreq_get(unsigned int cpu)
111 {
112         return cclk_frequency_100khz[PPCR & 0xf] * 100;
113 }
114 EXPORT_SYMBOL(cpufreq_get);
115 #endif
116
117 /*
118  * This is the SA11x0 sched_clock implementation.  This has
119  * a resolution of 271ns, and a maximum value of 1165s.
120  *  ( * 1E9 / 3686400 => * 78125 / 288)
121  */
122 unsigned long long sched_clock(void)
123 {
124         unsigned long long v;
125
126         v = (unsigned long long)OSCR * 78125;
127         do_div(v, 288);
128
129         return v;
130 }
131
132 /*
133  * Default power-off for SA1100
134  */
135 static void sa1100_power_off(void)
136 {
137         mdelay(100);
138         local_irq_disable();
139         /* disable internal oscillator, float CS lines */
140         PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
141         /* enable wake-up on GPIO0 (Assabet...) */
142         PWER = GFER = GRER = 1;
143         /*
144          * set scratchpad to zero, just in case it is used as a
145          * restart address by the bootloader.
146          */
147         PSPR = 0;
148         /* enter sleep mode */
149         PMCR = PMCR_SF;
150 }
151
152 static struct resource sa11x0udc_resources[] = {
153         [0] = {
154                 .start  = 0x80000000,
155                 .end    = 0x8000ffff,
156                 .flags  = IORESOURCE_MEM,
157         },
158 };
159
160 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
161
162 static struct platform_device sa11x0udc_device = {
163         .name           = "sa11x0-udc",
164         .id             = -1,
165         .dev            = {
166                 .dma_mask = &sa11x0udc_dma_mask,
167                 .coherent_dma_mask = 0xffffffff,
168         },
169         .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
170         .resource       = sa11x0udc_resources,
171 };
172
173 static struct resource sa11x0uart1_resources[] = {
174         [0] = {
175                 .start  = 0x80010000,
176                 .end    = 0x8001ffff,
177                 .flags  = IORESOURCE_MEM,
178         },
179 };
180
181 static struct platform_device sa11x0uart1_device = {
182         .name           = "sa11x0-uart",
183         .id             = 1,
184         .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
185         .resource       = sa11x0uart1_resources,
186 };
187
188 static struct resource sa11x0uart3_resources[] = {
189         [0] = {
190                 .start  = 0x80050000,
191                 .end    = 0x8005ffff,
192                 .flags  = IORESOURCE_MEM,
193         },
194 };
195
196 static struct platform_device sa11x0uart3_device = {
197         .name           = "sa11x0-uart",
198         .id             = 3,
199         .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
200         .resource       = sa11x0uart3_resources,
201 };
202
203 static struct resource sa11x0mcp_resources[] = {
204         [0] = {
205                 .start  = 0x80060000,
206                 .end    = 0x8006ffff,
207                 .flags  = IORESOURCE_MEM,
208         },
209 };
210
211 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
212
213 static struct platform_device sa11x0mcp_device = {
214         .name           = "sa11x0-mcp",
215         .id             = -1,
216         .dev = {
217                 .dma_mask = &sa11x0mcp_dma_mask,
218                 .coherent_dma_mask = 0xffffffff,
219         },
220         .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
221         .resource       = sa11x0mcp_resources,
222 };
223
224 void sa11x0_set_mcp_data(struct mcp_plat_data *data)
225 {
226         sa11x0mcp_device.dev.platform_data = data;
227 }
228
229 static struct resource sa11x0ssp_resources[] = {
230         [0] = {
231                 .start  = 0x80070000,
232                 .end    = 0x8007ffff,
233                 .flags  = IORESOURCE_MEM,
234         },
235 };
236
237 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
238
239 static struct platform_device sa11x0ssp_device = {
240         .name           = "sa11x0-ssp",
241         .id             = -1,
242         .dev = {
243                 .dma_mask = &sa11x0ssp_dma_mask,
244                 .coherent_dma_mask = 0xffffffff,
245         },
246         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
247         .resource       = sa11x0ssp_resources,
248 };
249
250 static struct resource sa11x0fb_resources[] = {
251         [0] = {
252                 .start  = 0xb0100000,
253                 .end    = 0xb010ffff,
254                 .flags  = IORESOURCE_MEM,
255         },
256         [1] = {
257                 .start  = IRQ_LCD,
258                 .end    = IRQ_LCD,
259                 .flags  = IORESOURCE_IRQ,
260         },
261 };
262
263 static struct platform_device sa11x0fb_device = {
264         .name           = "sa11x0-fb",
265         .id             = -1,
266         .dev = {
267                 .coherent_dma_mask = 0xffffffff,
268         },
269         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
270         .resource       = sa11x0fb_resources,
271 };
272
273 static struct platform_device sa11x0pcmcia_device = {
274         .name           = "sa11x0-pcmcia",
275         .id             = -1,
276 };
277
278 static struct platform_device sa11x0mtd_device = {
279         .name           = "flash",
280         .id             = -1,
281 };
282
283 void sa11x0_set_flash_data(struct flash_platform_data *flash,
284                            struct resource *res, int nr)
285 {
286         sa11x0mtd_device.dev.platform_data = flash;
287         sa11x0mtd_device.resource = res;
288         sa11x0mtd_device.num_resources = nr;
289 }
290
291 static struct resource sa11x0ir_resources[] = {
292         {
293                 .start  = __PREG(Ser2UTCR0),
294                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
295                 .flags  = IORESOURCE_MEM,
296         }, {
297                 .start  = __PREG(Ser2HSCR0),
298                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
299                 .flags  = IORESOURCE_MEM,
300         }, {
301                 .start  = __PREG(Ser2HSCR2),
302                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
303                 .flags  = IORESOURCE_MEM,
304         }, {
305                 .start  = IRQ_Ser2ICP,
306                 .end    = IRQ_Ser2ICP,
307                 .flags  = IORESOURCE_IRQ,
308         }
309 };
310
311 static struct platform_device sa11x0ir_device = {
312         .name           = "sa11x0-ir",
313         .id             = -1,
314         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
315         .resource       = sa11x0ir_resources,
316 };
317
318 void sa11x0_set_irda_data(struct irda_platform_data *irda)
319 {
320         sa11x0ir_device.dev.platform_data = irda;
321 }
322
323 static struct platform_device *sa11x0_devices[] __initdata = {
324         &sa11x0udc_device,
325         &sa11x0uart1_device,
326         &sa11x0uart3_device,
327         &sa11x0mcp_device,
328         &sa11x0ssp_device,
329         &sa11x0pcmcia_device,
330         &sa11x0fb_device,
331         &sa11x0mtd_device,
332 };
333
334 static int __init sa1100_init(void)
335 {
336         pm_power_off = sa1100_power_off;
337
338         if (sa11x0ir_device.dev.platform_data)
339                 platform_device_register(&sa11x0ir_device);
340
341         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
342 }
343
344 arch_initcall(sa1100_init);
345
346 void (*sa1100fb_backlight_power)(int on);
347 void (*sa1100fb_lcd_power)(int on);
348
349 EXPORT_SYMBOL(sa1100fb_backlight_power);
350 EXPORT_SYMBOL(sa1100fb_lcd_power);
351
352
353 /*
354  * Common I/O mapping:
355  *
356  * Typically, static virtual address mappings are as follow:
357  *
358  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
359  * 0xf4000000-0xf4ffffff:       SA-1111
360  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
361  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
362  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
363  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
364  *
365  * Below 0xe8000000 is reserved for vm allocation.
366  *
367  * The machine specific code must provide the extra mapping beside the
368  * default mapping provided here.
369  */
370
371 static struct map_desc standard_io_desc[] __initdata = {
372         {       /* PCM */
373                 .virtual        =  0xf8000000,
374                 .pfn            = __phys_to_pfn(0x80000000),
375                 .length         = 0x00100000,
376                 .type           = MT_DEVICE
377         }, {    /* SCM */
378                 .virtual        =  0xfa000000,
379                 .pfn            = __phys_to_pfn(0x90000000),
380                 .length         = 0x00100000,
381                 .type           = MT_DEVICE
382         }, {    /* MER */
383                 .virtual        =  0xfc000000,
384                 .pfn            = __phys_to_pfn(0xa0000000),
385                 .length         = 0x00100000,
386                 .type           = MT_DEVICE
387         }, {    /* LCD + DMA */
388                 .virtual        =  0xfe000000,
389                 .pfn            = __phys_to_pfn(0xb0000000),
390                 .length         = 0x00200000,
391                 .type           = MT_DEVICE
392         },
393 };
394
395 void __init sa1100_map_io(void)
396 {
397         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
398 }
399
400 /*
401  * Disable the memory bus request/grant signals on the SA1110 to
402  * ensure that we don't receive spurious memory requests.  We set
403  * the MBGNT signal false to ensure the SA1111 doesn't own the
404  * SDRAM bus.
405  */
406 void __init sa1110_mb_disable(void)
407 {
408         unsigned long flags;
409
410         local_irq_save(flags);
411         
412         PGSR &= ~GPIO_MBGNT;
413         GPCR = GPIO_MBGNT;
414         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
415
416         GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
417
418         local_irq_restore(flags);
419 }
420
421 /*
422  * If the system is going to use the SA-1111 DMA engines, set up
423  * the memory bus request/grant pins.
424  */
425 void __init sa1110_mb_enable(void)
426 {
427         unsigned long flags;
428
429         local_irq_save(flags);
430
431         PGSR &= ~GPIO_MBGNT;
432         GPCR = GPIO_MBGNT;
433         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
434
435         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
436         TUCR |= TUCR_MR;
437
438         local_irq_restore(flags);
439 }
440