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 static struct resource sa11x0ssp_resources[] = {
 225         [0] = {
 226                 .start  = 0x80070000,
 227                 .end    = 0x8007ffff,
 228                 .flags  = IORESOURCE_MEM,
 229         },
 230 };
 231
 232 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 233
 234 static struct platform_device sa11x0ssp_device = {
 235         .name           = "sa11x0-ssp",
 236         .id             = -1,
 237         .dev = {
 238                 .dma_mask = &sa11x0ssp_dma_mask,
 239                 .coherent_dma_mask = 0xffffffff,
 240         },
 241         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 242         .resource       = sa11x0ssp_resources,
 243 };
 244
 245 static struct resource sa11x0fb_resources[] = {
 246         [0] = {
 247                 .start  = 0xb0100000,
 248                 .end    = 0xb010ffff,
 249                 .flags  = IORESOURCE_MEM,
 250         },
 251         [1] = {
 252                 .start  = IRQ_LCD,
 253                 .end    = IRQ_LCD,
 254                 .flags  = IORESOURCE_IRQ,
 255         },
 256 };
 257
 258 static struct platform_device sa11x0fb_device = {
 259         .name           = "sa11x0-fb",
 260         .id             = -1,
 261         .dev = {
 262                 .coherent_dma_mask = 0xffffffff,
 263         },
 264         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 265         .resource       = sa11x0fb_resources,
 266 };
 267
 268 static struct platform_device sa11x0pcmcia_device = {
 269         .name           = "sa11x0-pcmcia",
 270         .id             = -1,
 271 };
 272
 273 static struct platform_device sa11x0mtd_device = {
 274         .name           = "flash",
 275         .id             = -1,
 276 };
 277
 278 void sa11x0_set_flash_data(struct flash_platform_data *flash,
 279                            struct resource *res, int nr)
 280 {
 281         sa11x0mtd_device.dev.platform_data = flash;
 282         sa11x0mtd_device.resource = res;
 283         sa11x0mtd_device.num_resources = nr;
 284 }
 285
 286 static struct resource sa11x0ir_resources[] = {
 287         {
 288                 .start  = __PREG(Ser2UTCR0),
 289                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 290                 .flags  = IORESOURCE_MEM,
 291         }, {
 292                 .start  = __PREG(Ser2HSCR0),
 293                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 294                 .flags  = IORESOURCE_MEM,
 295         }, {
 296                 .start  = __PREG(Ser2HSCR2),
 297                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 298                 .flags  = IORESOURCE_MEM,
 299         }, {
 300                 .start  = IRQ_Ser2ICP,
 301                 .end    = IRQ_Ser2ICP,
 302                 .flags  = IORESOURCE_IRQ,
 303         }
 304 };
 305
 306 static struct platform_device sa11x0ir_device = {
 307         .name           = "sa11x0-ir",
 308         .id             = -1,
 309         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 310         .resource       = sa11x0ir_resources,
 311 };
 312
 313 void sa11x0_set_irda_data(struct irda_platform_data *irda)
 314 {
 315         sa11x0ir_device.dev.platform_data = irda;
 316 }
 317
 318 static struct platform_device *sa11x0_devices[] __initdata = {
 319         &sa11x0udc_device,
 320         &sa11x0uart1_device,
 321         &sa11x0uart3_device,
 322         &sa11x0mcp_device,
 323         &sa11x0ssp_device,
 324         &sa11x0pcmcia_device,
 325         &sa11x0fb_device,
 326         &sa11x0mtd_device,
 327 };
 328
 329 static int __init sa1100_init(void)
 330 {
 331         pm_power_off = sa1100_power_off;
 332
 333         if (sa11x0ir_device.dev.platform_data)
 334                 platform_device_register(&sa11x0ir_device);
 335
 336         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 337 }
 338
 339 arch_initcall(sa1100_init);
 340
 341 void (*sa1100fb_backlight_power)(int on);
 342 void (*sa1100fb_lcd_power)(int on);
 343
 344 EXPORT_SYMBOL(sa1100fb_backlight_power);
 345 EXPORT_SYMBOL(sa1100fb_lcd_power);
 346
 347
 348 /*
 349  * Common I/O mapping:
 350  *
 351  * Typically, static virtual address mappings are as follow:
 352  *
 353  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 354  * 0xf4000000-0xf4ffffff:       SA-1111
 355  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 356  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 357  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 358  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 359  *
 360  * Below 0xe8000000 is reserved for vm allocation.
 361  *
 362  * The machine specific code must provide the extra mapping beside the
 363  * default mapping provided here.
 364  */
 365
 366 static struct map_desc standard_io_desc[] __initdata = {
 367  /* virtual     physical    length      type */
 368   { 0xf8000000, 0x80000000, 0x00100000, MT_DEVICE }, /* PCM */
 369   { 0xfa000000, 0x90000000, 0x00100000, MT_DEVICE }, /* SCM */
 370   { 0xfc000000, 0xa0000000, 0x00100000, MT_DEVICE }, /* MER */
 371   { 0xfe000000, 0xb0000000, 0x00200000, MT_DEVICE }  /* LCD + DMA */
 372 };
 373
 374 void __init sa1100_map_io(void)
 375 {
 376         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 377 }
 378
 379 /*
 380  * Disable the memory bus request/grant signals on the SA1110 to
 381  * ensure that we don't receive spurious memory requests.  We set
 382  * the MBGNT signal false to ensure the SA1111 doesn't own the
 383  * SDRAM bus.
 384  */
 385 void __init sa1110_mb_disable(void)
 386 {
 387         unsigned long flags;
 388
 389         local_irq_save(flags);
 390
 391         PGSR &= ~GPIO_MBGNT;
 392         GPCR = GPIO_MBGNT;
 393         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 394
 395         GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
 396
 397         local_irq_restore(flags);
 398 }
 399
 400 /*
 401  * If the system is going to use the SA-1111 DMA engines, set up
 402  * the memory bus request/grant pins.
 403  */
 404 void __init sa1110_mb_enable(void)
 405 {
 406         unsigned long flags;
 407
 408         local_irq_save(flags);
 409
 410         PGSR &= ~GPIO_MBGNT;
 411         GPCR = GPIO_MBGNT;
 412         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 413
 414         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 415         TUCR |= TUCR_MR;
 416
 417         local_irq_restore(flags);
 418 }
 419