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