release/src-rt-6.x.4708/linux/linux-2.6.36/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/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/delay.h>
  16 #include <linux/pm.h>
  17 #include <linux/cpufreq.h>
  18 #include <linux/ioport.h>
  19 #include <linux/sched.h>        /* just for sched_clock() - funny that */
  20 #include <linux/platform_device.h>
  21 #include <linux/cnt32_to_63.h>
  22
  23 #include <asm/div64.h>
  24 #include <mach/hardware.h>
  25 #include <asm/system.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/flash.h>
  29 #include <asm/irq.h>
  30 #include <asm/gpio.h>
  31
  32 #include "generic.h"
  33
  34 unsigned int reset_status;
  35 EXPORT_SYMBOL(reset_status);
  36
  37 #define NR_FREQS        16
  38
  39 /*
  40  * This table is setup for a 3.6864MHz Crystal.
  41  */
  42 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
  43          590,   /*  59.0 MHz */
  44          737,   /*  73.7 MHz */
  45          885,   /*  88.5 MHz */
  46         1032,   /* 103.2 MHz */
  47         1180,   /* 118.0 MHz */
  48         1327,   /* 132.7 MHz */
  49         1475,   /* 147.5 MHz */
  50         1622,   /* 162.2 MHz */
  51         1769,   /* 176.9 MHz */
  52         1917,   /* 191.7 MHz */
  53         2064,   /* 206.4 MHz */
  54         2212,   /* 221.2 MHz */
  55         2359,   /* 235.9 MHz */
  56         2507,   /* 250.7 MHz */
  57         2654,   /* 265.4 MHz */
  58         2802    /* 280.2 MHz */
  59 };
  60
  61 /* rounds up(!)  */
  62 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
  63 {
  64         int i;
  65
  66         khz /= 100;
  67
  68         for (i = 0; i < NR_FREQS; i++)
  69                 if (cclk_frequency_100khz[i] >= khz)
  70                         break;
  71
  72         return i;
  73 }
  74
  75 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
  76 {
  77         unsigned int freq = 0;
  78         if (idx < NR_FREQS)
  79                 freq = cclk_frequency_100khz[idx] * 100;
  80         return freq;
  81 }
  82
  83
  84 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
  85  * this platform, anyway.
  86  */
  87 int sa11x0_verify_speed(struct cpufreq_policy *policy)
  88 {
  89         unsigned int tmp;
  90         if (policy->cpu)
  91                 return -EINVAL;
  92
  93         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  94
  95         /* make sure that at least one frequency is within the policy */
  96         tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
  97         if (tmp > policy->max)
  98                 policy->max = tmp;
  99
 100         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
 101
 102         return 0;
 103 }
 104
 105 unsigned int sa11x0_getspeed(unsigned int cpu)
 106 {
 107         if (cpu)
 108                 return 0;
 109         return cclk_frequency_100khz[PPCR & 0xf] * 100;
 110 }
 111
 112 /*
 113  * This is the SA11x0 sched_clock implementation.  This has
 114  * a resolution of 271ns, and a maximum value of 32025597s (370 days).
 115  *
 116  * The return value is guaranteed to be monotonic in that range as
 117  * long as there is always less than 582 seconds between successive
 118  * calls to this function.
 119  *
 120  *  ( * 1E9 / 3686400 => * 78125 / 288)
 121  */
 122 unsigned long long sched_clock(void)
 123 {
 124         unsigned long long v = cnt32_to_63(OSCR);
 125
 126         /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
 127         v *= 78125<<1;
 128         do_div(v, 288<<1);
 129
 130         return v;
 131 }
 132
 133 /*
 134  * Default power-off for SA1100
 135  */
 136 static void sa1100_power_off(void)
 137 {
 138         mdelay(100);
 139         local_irq_disable();
 140         /* disable internal oscillator, float CS lines */
 141         PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
 142         /* enable wake-up on GPIO0 (Assabet...) */
 143         PWER = GFER = GRER = 1;
 144         /*
 145          * set scratchpad to zero, just in case it is used as a
 146          * restart address by the bootloader.
 147          */
 148         PSPR = 0;
 149         /* enter sleep mode */
 150         PMCR = PMCR_SF;
 151 }
 152
 153 static void sa11x0_register_device(struct platform_device *dev, void *data)
 154 {
 155         int err;
 156         dev->dev.platform_data = data;
 157         err = platform_device_register(dev);
 158         if (err)
 159                 printk(KERN_ERR "Unable to register device %s: %d\n",
 160                         dev->name, err);
 161 }
 162
 163
 164 static struct resource sa11x0udc_resources[] = {
 165         [0] = {
 166                 .start  = 0x80000000,
 167                 .end    = 0x8000ffff,
 168                 .flags  = IORESOURCE_MEM,
 169         },
 170 };
 171
 172 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
 173
 174 static struct platform_device sa11x0udc_device = {
 175         .name           = "sa11x0-udc",
 176         .id             = -1,
 177         .dev            = {
 178                 .dma_mask = &sa11x0udc_dma_mask,
 179                 .coherent_dma_mask = 0xffffffff,
 180         },
 181         .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
 182         .resource       = sa11x0udc_resources,
 183 };
 184
 185 static struct resource sa11x0uart1_resources[] = {
 186         [0] = {
 187                 .start  = 0x80010000,
 188                 .end    = 0x8001ffff,
 189                 .flags  = IORESOURCE_MEM,
 190         },
 191 };
 192
 193 static struct platform_device sa11x0uart1_device = {
 194         .name           = "sa11x0-uart",
 195         .id             = 1,
 196         .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
 197         .resource       = sa11x0uart1_resources,
 198 };
 199
 200 static struct resource sa11x0uart3_resources[] = {
 201         [0] = {
 202                 .start  = 0x80050000,
 203                 .end    = 0x8005ffff,
 204                 .flags  = IORESOURCE_MEM,
 205         },
 206 };
 207
 208 static struct platform_device sa11x0uart3_device = {
 209         .name           = "sa11x0-uart",
 210         .id             = 3,
 211         .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
 212         .resource       = sa11x0uart3_resources,
 213 };
 214
 215 static struct resource sa11x0mcp_resources[] = {
 216         [0] = {
 217                 .start  = 0x80060000,
 218                 .end    = 0x8006ffff,
 219                 .flags  = IORESOURCE_MEM,
 220         },
 221 };
 222
 223 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
 224
 225 static struct platform_device sa11x0mcp_device = {
 226         .name           = "sa11x0-mcp",
 227         .id             = -1,
 228         .dev = {
 229                 .dma_mask = &sa11x0mcp_dma_mask,
 230                 .coherent_dma_mask = 0xffffffff,
 231         },
 232         .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
 233         .resource       = sa11x0mcp_resources,
 234 };
 235
 236 void sa11x0_register_mcp(struct mcp_plat_data *data)
 237 {
 238         sa11x0_register_device(&sa11x0mcp_device, data);
 239 }
 240
 241 static struct resource sa11x0ssp_resources[] = {
 242         [0] = {
 243                 .start  = 0x80070000,
 244                 .end    = 0x8007ffff,
 245                 .flags  = IORESOURCE_MEM,
 246         },
 247 };
 248
 249 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 250
 251 static struct platform_device sa11x0ssp_device = {
 252         .name           = "sa11x0-ssp",
 253         .id             = -1,
 254         .dev = {
 255                 .dma_mask = &sa11x0ssp_dma_mask,
 256                 .coherent_dma_mask = 0xffffffff,
 257         },
 258         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 259         .resource       = sa11x0ssp_resources,
 260 };
 261
 262 static struct resource sa11x0fb_resources[] = {
 263         [0] = {
 264                 .start  = 0xb0100000,
 265                 .end    = 0xb010ffff,
 266                 .flags  = IORESOURCE_MEM,
 267         },
 268         [1] = {
 269                 .start  = IRQ_LCD,
 270                 .end    = IRQ_LCD,
 271                 .flags  = IORESOURCE_IRQ,
 272         },
 273 };
 274
 275 static struct platform_device sa11x0fb_device = {
 276         .name           = "sa11x0-fb",
 277         .id             = -1,
 278         .dev = {
 279                 .coherent_dma_mask = 0xffffffff,
 280         },
 281         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 282         .resource       = sa11x0fb_resources,
 283 };
 284
 285 static struct platform_device sa11x0pcmcia_device = {
 286         .name           = "sa11x0-pcmcia",
 287         .id             = -1,
 288 };
 289
 290 static struct platform_device sa11x0mtd_device = {
 291         .name           = "sa1100-mtd",
 292         .id             = -1,
 293 };
 294
 295 void sa11x0_register_mtd(struct flash_platform_data *flash,
 296                          struct resource *res, int nr)
 297 {
 298         flash->name = "sa1100";
 299         sa11x0mtd_device.resource = res;
 300         sa11x0mtd_device.num_resources = nr;
 301         sa11x0_register_device(&sa11x0mtd_device, flash);
 302 }
 303
 304 static struct resource sa11x0ir_resources[] = {
 305         {
 306                 .start  = __PREG(Ser2UTCR0),
 307                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 308                 .flags  = IORESOURCE_MEM,
 309         }, {
 310                 .start  = __PREG(Ser2HSCR0),
 311                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 312                 .flags  = IORESOURCE_MEM,
 313         }, {
 314                 .start  = __PREG(Ser2HSCR2),
 315                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 316                 .flags  = IORESOURCE_MEM,
 317         }, {
 318                 .start  = IRQ_Ser2ICP,
 319                 .end    = IRQ_Ser2ICP,
 320                 .flags  = IORESOURCE_IRQ,
 321         }
 322 };
 323
 324 static struct platform_device sa11x0ir_device = {
 325         .name           = "sa11x0-ir",
 326         .id             = -1,
 327         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 328         .resource       = sa11x0ir_resources,
 329 };
 330
 331 void sa11x0_register_irda(struct irda_platform_data *irda)
 332 {
 333         sa11x0_register_device(&sa11x0ir_device, irda);
 334 }
 335
 336 static struct platform_device sa11x0rtc_device = {
 337         .name           = "sa1100-rtc",
 338         .id             = -1,
 339 };
 340
 341 static struct platform_device *sa11x0_devices[] __initdata = {
 342         &sa11x0udc_device,
 343         &sa11x0uart1_device,
 344         &sa11x0uart3_device,
 345         &sa11x0ssp_device,
 346         &sa11x0pcmcia_device,
 347         &sa11x0fb_device,
 348         &sa11x0rtc_device,
 349 };
 350
 351 static int __init sa1100_init(void)
 352 {
 353         pm_power_off = sa1100_power_off;
 354         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 355 }
 356
 357 arch_initcall(sa1100_init);
 358
 359 void (*sa1100fb_backlight_power)(int on);
 360 void (*sa1100fb_lcd_power)(int on);
 361
 362 EXPORT_SYMBOL(sa1100fb_backlight_power);
 363 EXPORT_SYMBOL(sa1100fb_lcd_power);
 364
 365
 366 /*
 367  * Common I/O mapping:
 368  *
 369  * Typically, static virtual address mappings are as follow:
 370  *
 371  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 372  * 0xf4000000-0xf4ffffff:       SA-1111
 373  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 374  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 375  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 376  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 377  *
 378  * Below 0xe8000000 is reserved for vm allocation.
 379  *
 380  * The machine specific code must provide the extra mapping beside the
 381  * default mapping provided here.
 382  */
 383
 384 static struct map_desc standard_io_desc[] __initdata = {
 385         {       /* PCM */
 386                 .virtual        =  0xf8000000,
 387                 .pfn            = __phys_to_pfn(0x80000000),
 388                 .length         = 0x00100000,
 389                 .type           = MT_DEVICE
 390         }, {    /* SCM */
 391                 .virtual        =  0xfa000000,
 392                 .pfn            = __phys_to_pfn(0x90000000),
 393                 .length         = 0x00100000,
 394                 .type           = MT_DEVICE
 395         }, {    /* MER */
 396                 .virtual        =  0xfc000000,
 397                 .pfn            = __phys_to_pfn(0xa0000000),
 398                 .length         = 0x00100000,
 399                 .type           = MT_DEVICE
 400         }, {    /* LCD + DMA */
 401                 .virtual        =  0xfe000000,
 402                 .pfn            = __phys_to_pfn(0xb0000000),
 403                 .length         = 0x00200000,
 404                 .type           = MT_DEVICE
 405         },
 406 };
 407
 408 void __init sa1100_map_io(void)
 409 {
 410         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 411 }
 412
 413 /*
 414  * Disable the memory bus request/grant signals on the SA1110 to
 415  * ensure that we don't receive spurious memory requests.  We set
 416  * the MBGNT signal false to ensure the SA1111 doesn't own the
 417  * SDRAM bus.
 418  */
 419 void __init sa1110_mb_disable(void)
 420 {
 421         unsigned long flags;
 422
 423         local_irq_save(flags);
 424
 425         PGSR &= ~GPIO_MBGNT;
 426         GPCR = GPIO_MBGNT;
 427         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 428
 429         GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
 430
 431         local_irq_restore(flags);
 432 }
 433
 434 /*
 435  * If the system is going to use the SA-1111 DMA engines, set up
 436  * the memory bus request/grant pins.
 437  */
 438 void __devinit sa1110_mb_enable(void)
 439 {
 440         unsigned long flags;
 441
 442         local_irq_save(flags);
 443
 444         PGSR &= ~GPIO_MBGNT;
 445         GPCR = GPIO_MBGNT;
 446         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 447
 448         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 449         TUCR |= TUCR_MR;
 450
 451         local_irq_restore(flags);
 452 }