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
  22 #include <asm/div64.h>
  23 #include <asm/hardware.h>
  24 #include <asm/system.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/mach/flash.h>
  28 #include <asm/irq.h>
  29
  30 #include "generic.h"
  31
  32 #define NR_FREQS        16
  33
  34 /*
  35  * This table is setup for a 3.6864MHz Crystal.
  36  */
  37 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
  38          590,   /*  59.0 MHz */
  39          737,   /*  73.7 MHz */
  40          885,   /*  88.5 MHz */
  41         1032,   /* 103.2 MHz */
  42         1180,   /* 118.0 MHz */
  43         1327,   /* 132.7 MHz */
  44         1475,   /* 147.5 MHz */
  45         1622,   /* 162.2 MHz */
  46         1769,   /* 176.9 MHz */
  47         1917,   /* 191.7 MHz */
  48         2064,   /* 206.4 MHz */
  49         2212,   /* 221.2 MHz */
  50         2359,   /* 235.9 MHz */
  51         2507,   /* 250.7 MHz */
  52         2654,   /* 265.4 MHz */
  53         2802    /* 280.2 MHz */
  54 };
  55
  56 #if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
  57 /* rounds up(!)  */
  58 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
  59 {
  60         int i;
  61
  62         khz /= 100;
  63
  64         for (i = 0; i < NR_FREQS; i++)
  65                 if (cclk_frequency_100khz[i] >= khz)
  66                         break;
  67
  68         return i;
  69 }
  70
  71 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
  72 {
  73         unsigned int freq = 0;
  74         if (idx < NR_FREQS)
  75                 freq = cclk_frequency_100khz[idx] * 100;
  76         return freq;
  77 }
  78
  79
  80 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
  81  * this platform, anyway.
  82  */
  83 int sa11x0_verify_speed(struct cpufreq_policy *policy)
  84 {
  85         unsigned int tmp;
  86         if (policy->cpu)
  87                 return -EINVAL;
  88
  89         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  90
  91         /* make sure that at least one frequency is within the policy */
  92         tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
  93         if (tmp > policy->max)
  94                 policy->max = tmp;
  95
  96         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  97
  98         return 0;
  99 }
 100
 101 unsigned int sa11x0_getspeed(unsigned int cpu)
 102 {
 103         if (cpu)
 104                 return 0;
 105         return cclk_frequency_100khz[PPCR & 0xf] * 100;
 106 }
 107
 108 #else
 109 /*
 110  * We still need to provide this so building without cpufreq works.
 111  */
 112 unsigned int cpufreq_get(unsigned int cpu)
 113 {
 114         return cclk_frequency_100khz[PPCR & 0xf] * 100;
 115 }
 116 EXPORT_SYMBOL(cpufreq_get);
 117 #endif
 118
 119 /*
 120  * This is the SA11x0 sched_clock implementation.  This has
 121  * a resolution of 271ns, and a maximum value of 1165s.
 122  *  ( * 1E9 / 3686400 => * 78125 / 288)
 123  */
 124 unsigned long long sched_clock(void)
 125 {
 126         unsigned long long v;
 127
 128         v = (unsigned long long)OSCR * 78125;
 129         do_div(v, 288);
 130
 131         return v;
 132 }
 133
 134 /*
 135  * Default power-off for SA1100
 136  */
 137 static void sa1100_power_off(void)
 138 {
 139         mdelay(100);
 140         local_irq_disable();
 141         /* disable internal oscillator, float CS lines */
 142         PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
 143         /* enable wake-up on GPIO0 (Assabet...) */
 144         PWER = GFER = GRER = 1;
 145         /*
 146          * set scratchpad to zero, just in case it is used as a
 147          * restart address by the bootloader.
 148          */
 149         PSPR = 0;
 150         /* enter sleep mode */
 151         PMCR = PMCR_SF;
 152 }
 153
 154 static struct resource sa11x0udc_resources[] = {
 155         [0] = {
 156                 .start  = 0x80000000,
 157                 .end    = 0x8000ffff,
 158                 .flags  = IORESOURCE_MEM,
 159         },
 160 };
 161
 162 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
 163
 164 static struct platform_device sa11x0udc_device = {
 165         .name           = "sa11x0-udc",
 166         .id             = -1,
 167         .dev            = {
 168                 .dma_mask = &sa11x0udc_dma_mask,
 169                 .coherent_dma_mask = 0xffffffff,
 170         },
 171         .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
 172         .resource       = sa11x0udc_resources,
 173 };
 174
 175 static struct resource sa11x0uart1_resources[] = {
 176         [0] = {
 177                 .start  = 0x80010000,
 178                 .end    = 0x8001ffff,
 179                 .flags  = IORESOURCE_MEM,
 180         },
 181 };
 182
 183 static struct platform_device sa11x0uart1_device = {
 184         .name           = "sa11x0-uart",
 185         .id             = 1,
 186         .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
 187         .resource       = sa11x0uart1_resources,
 188 };
 189
 190 static struct resource sa11x0uart3_resources[] = {
 191         [0] = {
 192                 .start  = 0x80050000,
 193                 .end    = 0x8005ffff,
 194                 .flags  = IORESOURCE_MEM,
 195         },
 196 };
 197
 198 static struct platform_device sa11x0uart3_device = {
 199         .name           = "sa11x0-uart",
 200         .id             = 3,
 201         .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
 202         .resource       = sa11x0uart3_resources,
 203 };
 204
 205 static struct resource sa11x0mcp_resources[] = {
 206         [0] = {
 207                 .start  = 0x80060000,
 208                 .end    = 0x8006ffff,
 209                 .flags  = IORESOURCE_MEM,
 210         },
 211 };
 212
 213 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
 214
 215 static struct platform_device sa11x0mcp_device = {
 216         .name           = "sa11x0-mcp",
 217         .id             = -1,
 218         .dev = {
 219                 .dma_mask = &sa11x0mcp_dma_mask,
 220                 .coherent_dma_mask = 0xffffffff,
 221         },
 222         .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
 223         .resource       = sa11x0mcp_resources,
 224 };
 225
 226 void sa11x0_set_mcp_data(struct mcp_plat_data *data)
 227 {
 228         sa11x0mcp_device.dev.platform_data = data;
 229 }
 230
 231 static struct resource sa11x0ssp_resources[] = {
 232         [0] = {
 233                 .start  = 0x80070000,
 234                 .end    = 0x8007ffff,
 235                 .flags  = IORESOURCE_MEM,
 236         },
 237 };
 238
 239 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 240
 241 static struct platform_device sa11x0ssp_device = {
 242         .name           = "sa11x0-ssp",
 243         .id             = -1,
 244         .dev = {
 245                 .dma_mask = &sa11x0ssp_dma_mask,
 246                 .coherent_dma_mask = 0xffffffff,
 247         },
 248         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 249         .resource       = sa11x0ssp_resources,
 250 };
 251
 252 static struct resource sa11x0fb_resources[] = {
 253         [0] = {
 254                 .start  = 0xb0100000,
 255                 .end    = 0xb010ffff,
 256                 .flags  = IORESOURCE_MEM,
 257         },
 258         [1] = {
 259                 .start  = IRQ_LCD,
 260                 .end    = IRQ_LCD,
 261                 .flags  = IORESOURCE_IRQ,
 262         },
 263 };
 264
 265 static struct platform_device sa11x0fb_device = {
 266         .name           = "sa11x0-fb",
 267         .id             = -1,
 268         .dev = {
 269                 .coherent_dma_mask = 0xffffffff,
 270         },
 271         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 272         .resource       = sa11x0fb_resources,
 273 };
 274
 275 static struct platform_device sa11x0pcmcia_device = {
 276         .name           = "sa11x0-pcmcia",
 277         .id             = -1,
 278 };
 279
 280 static struct platform_device sa11x0mtd_device = {
 281         .name           = "flash",
 282         .id             = -1,
 283 };
 284
 285 void sa11x0_set_flash_data(struct flash_platform_data *flash,
 286                            struct resource *res, int nr)
 287 {
 288         flash->name = "sa1100";
 289         sa11x0mtd_device.dev.platform_data = flash;
 290         sa11x0mtd_device.resource = res;
 291         sa11x0mtd_device.num_resources = nr;
 292 }
 293
 294 static struct resource sa11x0ir_resources[] = {
 295         {
 296                 .start  = __PREG(Ser2UTCR0),
 297                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 298                 .flags  = IORESOURCE_MEM,
 299         }, {
 300                 .start  = __PREG(Ser2HSCR0),
 301                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 302                 .flags  = IORESOURCE_MEM,
 303         }, {
 304                 .start  = __PREG(Ser2HSCR2),
 305                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 306                 .flags  = IORESOURCE_MEM,
 307         }, {
 308                 .start  = IRQ_Ser2ICP,
 309                 .end    = IRQ_Ser2ICP,
 310                 .flags  = IORESOURCE_IRQ,
 311         }
 312 };
 313
 314 static struct platform_device sa11x0ir_device = {
 315         .name           = "sa11x0-ir",
 316         .id             = -1,
 317         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 318         .resource       = sa11x0ir_resources,
 319 };
 320
 321 void sa11x0_set_irda_data(struct irda_platform_data *irda)
 322 {
 323         sa11x0ir_device.dev.platform_data = irda;
 324 }
 325
 326 static struct platform_device sa11x0rtc_device = {
 327         .name           = "sa1100-rtc",
 328         .id             = -1,
 329 };
 330
 331 static struct platform_device *sa11x0_devices[] __initdata = {
 332         &sa11x0udc_device,
 333         &sa11x0uart1_device,
 334         &sa11x0uart3_device,
 335         &sa11x0mcp_device,
 336         &sa11x0ssp_device,
 337         &sa11x0pcmcia_device,
 338         &sa11x0fb_device,
 339         &sa11x0mtd_device,
 340         &sa11x0rtc_device,
 341 };
 342
 343 static int __init sa1100_init(void)
 344 {
 345         pm_power_off = sa1100_power_off;
 346
 347         if (sa11x0ir_device.dev.platform_data)
 348                 platform_device_register(&sa11x0ir_device);
 349
 350         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 351 }
 352
 353 arch_initcall(sa1100_init);
 354
 355 void (*sa1100fb_backlight_power)(int on);
 356 void (*sa1100fb_lcd_power)(int on);
 357
 358 EXPORT_SYMBOL(sa1100fb_backlight_power);
 359 EXPORT_SYMBOL(sa1100fb_lcd_power);
 360
 361
 362 /*
 363  * Common I/O mapping:
 364  *
 365  * Typically, static virtual address mappings are as follow:
 366  *
 367  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 368  * 0xf4000000-0xf4ffffff:       SA-1111
 369  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 370  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 371  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 372  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 373  *
 374  * Below 0xe8000000 is reserved for vm allocation.
 375  *
 376  * The machine specific code must provide the extra mapping beside the
 377  * default mapping provided here.
 378  */
 379
 380 static struct map_desc standard_io_desc[] __initdata = {
 381         {       /* PCM */
 382                 .virtual        =  0xf8000000,
 383                 .pfn            = __phys_to_pfn(0x80000000),
 384                 .length         = 0x00100000,
 385                 .type           = MT_DEVICE
 386         }, {    /* SCM */
 387                 .virtual        =  0xfa000000,
 388                 .pfn            = __phys_to_pfn(0x90000000),
 389                 .length         = 0x00100000,
 390                 .type           = MT_DEVICE
 391         }, {    /* MER */
 392                 .virtual        =  0xfc000000,
 393                 .pfn            = __phys_to_pfn(0xa0000000),
 394                 .length         = 0x00100000,
 395                 .type           = MT_DEVICE
 396         }, {    /* LCD + DMA */
 397                 .virtual        =  0xfe000000,
 398                 .pfn            = __phys_to_pfn(0xb0000000),
 399                 .length         = 0x00200000,
 400                 .type           = MT_DEVICE
 401         },
 402 };
 403
 404 void __init sa1100_map_io(void)
 405 {
 406         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 407 }
 408
 409 /*
 410  * Disable the memory bus request/grant signals on the SA1110 to
 411  * ensure that we don't receive spurious memory requests.  We set
 412  * the MBGNT signal false to ensure the SA1111 doesn't own the
 413  * SDRAM bus.
 414  */
 415 void __init sa1110_mb_disable(void)
 416 {
 417         unsigned long flags;
 418
 419         local_irq_save(flags);
 420
 421         PGSR &= ~GPIO_MBGNT;
 422         GPCR = GPIO_MBGNT;
 423         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 424
 425         GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
 426
 427         local_irq_restore(flags);
 428 }
 429
 430 /*
 431  * If the system is going to use the SA-1111 DMA engines, set up
 432  * the memory bus request/grant pins.
 433  */
 434 void __init sa1110_mb_enable(void)
 435 {
 436         unsigned long flags;
 437
 438         local_irq_save(flags);
 439
 440         PGSR &= ~GPIO_MBGNT;
 441         GPCR = GPIO_MBGNT;
 442         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 443
 444         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 445         TUCR |= TUCR_MR;
 446
 447         local_irq_restore(flags);
 448 }
 449