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/platform_device.h>
  20
  21 #include <asm/div64.h>
  22 #include <mach/hardware.h>
  23 #include <asm/system.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach/flash.h>
  27 #include <asm/irq.h>
  28 #include <asm/gpio.h>
  29
  30 #include "generic.h"
  31
  32 unsigned int reset_status;
  33 EXPORT_SYMBOL(reset_status);
  34
  35 #define NR_FREQS        16
  36
  37 /*
  38  * This table is setup for a 3.6864MHz Crystal.
  39  */
  40 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
  41          590,   /*  59.0 MHz */
  42          737,   /*  73.7 MHz */
  43          885,   /*  88.5 MHz */
  44         1032,   /* 103.2 MHz */
  45         1180,   /* 118.0 MHz */
  46         1327,   /* 132.7 MHz */
  47         1475,   /* 147.5 MHz */
  48         1622,   /* 162.2 MHz */
  49         1769,   /* 176.9 MHz */
  50         1917,   /* 191.7 MHz */
  51         2064,   /* 206.4 MHz */
  52         2212,   /* 221.2 MHz */
  53         2359,   /* 235.9 MHz */
  54         2507,   /* 250.7 MHz */
  55         2654,   /* 265.4 MHz */
  56         2802    /* 280.2 MHz */
  57 };
  58
  59 /* rounds up(!)  */
  60 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
  61 {
  62         int i;
  63
  64         khz /= 100;
  65
  66         for (i = 0; i < NR_FREQS; i++)
  67                 if (cclk_frequency_100khz[i] >= khz)
  68                         break;
  69
  70         return i;
  71 }
  72
  73 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
  74 {
  75         unsigned int freq = 0;
  76         if (idx < NR_FREQS)
  77                 freq = cclk_frequency_100khz[idx] * 100;
  78         return freq;
  79 }
  80
  81
  82 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
  83  * this platform, anyway.
  84  */
  85 int sa11x0_verify_speed(struct cpufreq_policy *policy)
  86 {
  87         unsigned int tmp;
  88         if (policy->cpu)
  89                 return -EINVAL;
  90
  91         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  92
  93         /* make sure that at least one frequency is within the policy */
  94         tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
  95         if (tmp > policy->max)
  96                 policy->max = tmp;
  97
  98         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  99
 100         return 0;
 101 }
 102
 103 unsigned int sa11x0_getspeed(unsigned int cpu)
 104 {
 105         if (cpu)
 106                 return 0;
 107         return cclk_frequency_100khz[PPCR & 0xf] * 100;
 108 }
 109
 110 /*
 111  * Default power-off for SA1100
 112  */
 113 static void sa1100_power_off(void)
 114 {
 115         mdelay(100);
 116         local_irq_disable();
 117         /* disable internal oscillator, float CS lines */
 118         PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
 119         /* enable wake-up on GPIO0 (Assabet...) */
 120         PWER = GFER = GRER = 1;
 121         /*
 122          * set scratchpad to zero, just in case it is used as a
 123          * restart address by the bootloader.
 124          */
 125         PSPR = 0;
 126         /* enter sleep mode */
 127         PMCR = PMCR_SF;
 128 }
 129
 130 static void sa11x0_register_device(struct platform_device *dev, void *data)
 131 {
 132         int err;
 133         dev->dev.platform_data = data;
 134         err = platform_device_register(dev);
 135         if (err)
 136                 printk(KERN_ERR "Unable to register device %s: %d\n",
 137                         dev->name, err);
 138 }
 139
 140
 141 static struct resource sa11x0udc_resources[] = {
 142         [0] = {
 143                 .start  = __PREG(Ser0UDCCR),
 144                 .end    = __PREG(Ser0UDCCR) + 0xffff,
 145                 .flags  = IORESOURCE_MEM,
 146         },
 147         [1] = {
 148                 .start  = IRQ_Ser0UDC,
 149                 .end    = IRQ_Ser0UDC,
 150                 .flags  = IORESOURCE_IRQ,
 151         },
 152 };
 153
 154 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
 155
 156 static struct platform_device sa11x0udc_device = {
 157         .name           = "sa11x0-udc",
 158         .id             = -1,
 159         .dev            = {
 160                 .dma_mask = &sa11x0udc_dma_mask,
 161                 .coherent_dma_mask = 0xffffffff,
 162         },
 163         .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
 164         .resource       = sa11x0udc_resources,
 165 };
 166
 167 static struct resource sa11x0uart1_resources[] = {
 168         [0] = {
 169                 .start  = __PREG(Ser1UTCR0),
 170                 .end    = __PREG(Ser1UTCR0) + 0xffff,
 171                 .flags  = IORESOURCE_MEM,
 172         },
 173         [1] = {
 174                 .start  = IRQ_Ser1UART,
 175                 .end    = IRQ_Ser1UART,
 176                 .flags  = IORESOURCE_IRQ,
 177         },
 178 };
 179
 180 static struct platform_device sa11x0uart1_device = {
 181         .name           = "sa11x0-uart",
 182         .id             = 1,
 183         .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
 184         .resource       = sa11x0uart1_resources,
 185 };
 186
 187 static struct resource sa11x0uart3_resources[] = {
 188         [0] = {
 189                 .start  = __PREG(Ser3UTCR0),
 190                 .end    = __PREG(Ser3UTCR0) + 0xffff,
 191                 .flags  = IORESOURCE_MEM,
 192         },
 193         [1] = {
 194                 .start  = IRQ_Ser3UART,
 195                 .end    = IRQ_Ser3UART,
 196                 .flags  = IORESOURCE_IRQ,
 197         },
 198 };
 199
 200 static struct platform_device sa11x0uart3_device = {
 201         .name           = "sa11x0-uart",
 202         .id             = 3,
 203         .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
 204         .resource       = sa11x0uart3_resources,
 205 };
 206
 207 static struct resource sa11x0mcp_resources[] = {
 208         [0] = {
 209                 .start  = __PREG(Ser4MCCR0),
 210                 .end    = __PREG(Ser4MCCR0) + 0xffff,
 211                 .flags  = IORESOURCE_MEM,
 212         },
 213         [1] = {
 214                 .start  = IRQ_Ser4MCP,
 215                 .end    = IRQ_Ser4MCP,
 216                 .flags  = IORESOURCE_IRQ,
 217         },
 218 };
 219
 220 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
 221
 222 static struct platform_device sa11x0mcp_device = {
 223         .name           = "sa11x0-mcp",
 224         .id             = -1,
 225         .dev = {
 226                 .dma_mask = &sa11x0mcp_dma_mask,
 227                 .coherent_dma_mask = 0xffffffff,
 228         },
 229         .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
 230         .resource       = sa11x0mcp_resources,
 231 };
 232
 233 void sa11x0_register_mcp(struct mcp_plat_data *data)
 234 {
 235         sa11x0_register_device(&sa11x0mcp_device, data);
 236 }
 237
 238 static struct resource sa11x0ssp_resources[] = {
 239         [0] = {
 240                 .start  = 0x80070000,
 241                 .end    = 0x8007ffff,
 242                 .flags  = IORESOURCE_MEM,
 243         },
 244         [1] = {
 245                 .start  = IRQ_Ser4SSP,
 246                 .end    = IRQ_Ser4SSP,
 247                 .flags  = IORESOURCE_IRQ,
 248         },
 249 };
 250
 251 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 252
 253 static struct platform_device sa11x0ssp_device = {
 254         .name           = "sa11x0-ssp",
 255         .id             = -1,
 256         .dev = {
 257                 .dma_mask = &sa11x0ssp_dma_mask,
 258                 .coherent_dma_mask = 0xffffffff,
 259         },
 260         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 261         .resource       = sa11x0ssp_resources,
 262 };
 263
 264 static struct resource sa11x0fb_resources[] = {
 265         [0] = {
 266                 .start  = 0xb0100000,
 267                 .end    = 0xb010ffff,
 268                 .flags  = IORESOURCE_MEM,
 269         },
 270         [1] = {
 271                 .start  = IRQ_LCD,
 272                 .end    = IRQ_LCD,
 273                 .flags  = IORESOURCE_IRQ,
 274         },
 275 };
 276
 277 static struct platform_device sa11x0fb_device = {
 278         .name           = "sa11x0-fb",
 279         .id             = -1,
 280         .dev = {
 281                 .coherent_dma_mask = 0xffffffff,
 282         },
 283         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 284         .resource       = sa11x0fb_resources,
 285 };
 286
 287 static struct platform_device sa11x0pcmcia_device = {
 288         .name           = "sa11x0-pcmcia",
 289         .id             = -1,
 290 };
 291
 292 static struct platform_device sa11x0mtd_device = {
 293         .name           = "sa1100-mtd",
 294         .id             = -1,
 295 };
 296
 297 void sa11x0_register_mtd(struct flash_platform_data *flash,
 298                          struct resource *res, int nr)
 299 {
 300         flash->name = "sa1100";
 301         sa11x0mtd_device.resource = res;
 302         sa11x0mtd_device.num_resources = nr;
 303         sa11x0_register_device(&sa11x0mtd_device, flash);
 304 }
 305
 306 static struct resource sa11x0ir_resources[] = {
 307         {
 308                 .start  = __PREG(Ser2UTCR0),
 309                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 310                 .flags  = IORESOURCE_MEM,
 311         }, {
 312                 .start  = __PREG(Ser2HSCR0),
 313                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 314                 .flags  = IORESOURCE_MEM,
 315         }, {
 316                 .start  = __PREG(Ser2HSCR2),
 317                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 318                 .flags  = IORESOURCE_MEM,
 319         }, {
 320                 .start  = IRQ_Ser2ICP,
 321                 .end    = IRQ_Ser2ICP,
 322                 .flags  = IORESOURCE_IRQ,
 323         }
 324 };
 325
 326 static struct platform_device sa11x0ir_device = {
 327         .name           = "sa11x0-ir",
 328         .id             = -1,
 329         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 330         .resource       = sa11x0ir_resources,
 331 };
 332
 333 void sa11x0_register_irda(struct irda_platform_data *irda)
 334 {
 335         sa11x0_register_device(&sa11x0ir_device, irda);
 336 }
 337
 338 static struct platform_device sa11x0rtc_device = {
 339         .name           = "sa1100-rtc",
 340         .id             = -1,
 341 };
 342
 343 static struct platform_device *sa11x0_devices[] __initdata = {
 344         &sa11x0udc_device,
 345         &sa11x0uart1_device,
 346         &sa11x0uart3_device,
 347         &sa11x0ssp_device,
 348         &sa11x0pcmcia_device,
 349         &sa11x0fb_device,
 350         &sa11x0rtc_device,
 351 };
 352
 353 static int __init sa1100_init(void)
 354 {
 355         pm_power_off = sa1100_power_off;
 356         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 357 }
 358
 359 arch_initcall(sa1100_init);
 360
 361 void (*sa1100fb_backlight_power)(int on);
 362 void (*sa1100fb_lcd_power)(int on);
 363
 364 EXPORT_SYMBOL(sa1100fb_backlight_power);
 365 EXPORT_SYMBOL(sa1100fb_lcd_power);
 366
 367
 368 /*
 369  * Common I/O mapping:
 370  *
 371  * Typically, static virtual address mappings are as follow:
 372  *
 373  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 374  * 0xf4000000-0xf4ffffff:       SA-1111
 375  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 376  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 377  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 378  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 379  *
 380  * Below 0xe8000000 is reserved for vm allocation.
 381  *
 382  * The machine specific code must provide the extra mapping beside the
 383  * default mapping provided here.
 384  */
 385
 386 static struct map_desc standard_io_desc[] __initdata = {
 387         {       /* PCM */
 388                 .virtual        =  0xf8000000,
 389                 .pfn            = __phys_to_pfn(0x80000000),
 390                 .length         = 0x00100000,
 391                 .type           = MT_DEVICE
 392         }, {    /* SCM */
 393                 .virtual        =  0xfa000000,
 394                 .pfn            = __phys_to_pfn(0x90000000),
 395                 .length         = 0x00100000,
 396                 .type           = MT_DEVICE
 397         }, {    /* MER */
 398                 .virtual        =  0xfc000000,
 399                 .pfn            = __phys_to_pfn(0xa0000000),
 400                 .length         = 0x00100000,
 401                 .type           = MT_DEVICE
 402         }, {    /* LCD + DMA */
 403                 .virtual        =  0xfe000000,
 404                 .pfn            = __phys_to_pfn(0xb0000000),
 405                 .length         = 0x00200000,
 406                 .type           = MT_DEVICE
 407         },
 408 };
 409
 410 void __init sa1100_map_io(void)
 411 {
 412         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 413 }
 414
 415 /*
 416  * Disable the memory bus request/grant signals on the SA1110 to
 417  * ensure that we don't receive spurious memory requests.  We set
 418  * the MBGNT signal false to ensure the SA1111 doesn't own the
 419  * SDRAM bus.
 420  */
 421 void __init sa1110_mb_disable(void)
 422 {
 423         unsigned long flags;
 424
 425         local_irq_save(flags);
 426
 427         PGSR &= ~GPIO_MBGNT;
 428         GPCR = GPIO_MBGNT;
 429         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 430
 431         GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
 432
 433         local_irq_restore(flags);
 434 }
 435
 436 /*
 437  * If the system is going to use the SA-1111 DMA engines, set up
 438  * the memory bus request/grant pins.
 439  */
 440 void __devinit sa1110_mb_enable(void)
 441 {
 442         unsigned long flags;
 443
 444         local_irq_save(flags);
 445
 446         PGSR &= ~GPIO_MBGNT;
 447         GPCR = GPIO_MBGNT;
 448         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 449
 450         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 451         TUCR |= TUCR_MR;
 452
 453         local_irq_restore(flags);
 454 }
 455