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 void sa11x0_restart(char mode, const char *cmd)
 130 {
 131         if (mode == 's') {
 132                 /* Jump into ROM at address 0 */
 133                 soft_restart(0);
 134         } else {
 135                 /* Use on-chip reset capability */
 136                 RSRR = RSRR_SWR;
 137         }
 138 }
 139
 140 static void sa11x0_register_device(struct platform_device *dev, void *data)
 141 {
 142         int err;
 143         dev->dev.platform_data = data;
 144         err = platform_device_register(dev);
 145         if (err)
 146                 printk(KERN_ERR "Unable to register device %s: %d\n",
 147                         dev->name, err);
 148 }
 149
 150
 151 static struct resource sa11x0udc_resources[] = {
 152         [0] = {
 153                 .start  = __PREG(Ser0UDCCR),
 154                 .end    = __PREG(Ser0UDCCR) + 0xffff,
 155                 .flags  = IORESOURCE_MEM,
 156         },
 157         [1] = {
 158                 .start  = IRQ_Ser0UDC,
 159                 .end    = IRQ_Ser0UDC,
 160                 .flags  = IORESOURCE_IRQ,
 161         },
 162 };
 163
 164 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
 165
 166 static struct platform_device sa11x0udc_device = {
 167         .name           = "sa11x0-udc",
 168         .id             = -1,
 169         .dev            = {
 170                 .dma_mask = &sa11x0udc_dma_mask,
 171                 .coherent_dma_mask = 0xffffffff,
 172         },
 173         .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
 174         .resource       = sa11x0udc_resources,
 175 };
 176
 177 static struct resource sa11x0uart1_resources[] = {
 178         [0] = {
 179                 .start  = __PREG(Ser1UTCR0),
 180                 .end    = __PREG(Ser1UTCR0) + 0xffff,
 181                 .flags  = IORESOURCE_MEM,
 182         },
 183         [1] = {
 184                 .start  = IRQ_Ser1UART,
 185                 .end    = IRQ_Ser1UART,
 186                 .flags  = IORESOURCE_IRQ,
 187         },
 188 };
 189
 190 static struct platform_device sa11x0uart1_device = {
 191         .name           = "sa11x0-uart",
 192         .id             = 1,
 193         .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
 194         .resource       = sa11x0uart1_resources,
 195 };
 196
 197 static struct resource sa11x0uart3_resources[] = {
 198         [0] = {
 199                 .start  = __PREG(Ser3UTCR0),
 200                 .end    = __PREG(Ser3UTCR0) + 0xffff,
 201                 .flags  = IORESOURCE_MEM,
 202         },
 203         [1] = {
 204                 .start  = IRQ_Ser3UART,
 205                 .end    = IRQ_Ser3UART,
 206                 .flags  = IORESOURCE_IRQ,
 207         },
 208 };
 209
 210 static struct platform_device sa11x0uart3_device = {
 211         .name           = "sa11x0-uart",
 212         .id             = 3,
 213         .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
 214         .resource       = sa11x0uart3_resources,
 215 };
 216
 217 static struct resource sa11x0mcp_resources[] = {
 218         [0] = {
 219                 .start  = __PREG(Ser4MCCR0),
 220                 .end    = __PREG(Ser4MCCR0) + 0xffff,
 221                 .flags  = IORESOURCE_MEM,
 222         },
 223         [1] = {
 224                 .start  = IRQ_Ser4MCP,
 225                 .end    = IRQ_Ser4MCP,
 226                 .flags  = IORESOURCE_IRQ,
 227         },
 228 };
 229
 230 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
 231
 232 static struct platform_device sa11x0mcp_device = {
 233         .name           = "sa11x0-mcp",
 234         .id             = -1,
 235         .dev = {
 236                 .dma_mask = &sa11x0mcp_dma_mask,
 237                 .coherent_dma_mask = 0xffffffff,
 238         },
 239         .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
 240         .resource       = sa11x0mcp_resources,
 241 };
 242
 243 void sa11x0_register_mcp(struct mcp_plat_data *data)
 244 {
 245         sa11x0_register_device(&sa11x0mcp_device, data);
 246 }
 247
 248 static struct resource sa11x0ssp_resources[] = {
 249         [0] = {
 250                 .start  = 0x80070000,
 251                 .end    = 0x8007ffff,
 252                 .flags  = IORESOURCE_MEM,
 253         },
 254         [1] = {
 255                 .start  = IRQ_Ser4SSP,
 256                 .end    = IRQ_Ser4SSP,
 257                 .flags  = IORESOURCE_IRQ,
 258         },
 259 };
 260
 261 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 262
 263 static struct platform_device sa11x0ssp_device = {
 264         .name           = "sa11x0-ssp",
 265         .id             = -1,
 266         .dev = {
 267                 .dma_mask = &sa11x0ssp_dma_mask,
 268                 .coherent_dma_mask = 0xffffffff,
 269         },
 270         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 271         .resource       = sa11x0ssp_resources,
 272 };
 273
 274 static struct resource sa11x0fb_resources[] = {
 275         [0] = {
 276                 .start  = 0xb0100000,
 277                 .end    = 0xb010ffff,
 278                 .flags  = IORESOURCE_MEM,
 279         },
 280         [1] = {
 281                 .start  = IRQ_LCD,
 282                 .end    = IRQ_LCD,
 283                 .flags  = IORESOURCE_IRQ,
 284         },
 285 };
 286
 287 static struct platform_device sa11x0fb_device = {
 288         .name           = "sa11x0-fb",
 289         .id             = -1,
 290         .dev = {
 291                 .coherent_dma_mask = 0xffffffff,
 292         },
 293         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 294         .resource       = sa11x0fb_resources,
 295 };
 296
 297 static struct platform_device sa11x0pcmcia_device = {
 298         .name           = "sa11x0-pcmcia",
 299         .id             = -1,
 300 };
 301
 302 static struct platform_device sa11x0mtd_device = {
 303         .name           = "sa1100-mtd",
 304         .id             = -1,
 305 };
 306
 307 void sa11x0_register_mtd(struct flash_platform_data *flash,
 308                          struct resource *res, int nr)
 309 {
 310         flash->name = "sa1100";
 311         sa11x0mtd_device.resource = res;
 312         sa11x0mtd_device.num_resources = nr;
 313         sa11x0_register_device(&sa11x0mtd_device, flash);
 314 }
 315
 316 static struct resource sa11x0ir_resources[] = {
 317         {
 318                 .start  = __PREG(Ser2UTCR0),
 319                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 320                 .flags  = IORESOURCE_MEM,
 321         }, {
 322                 .start  = __PREG(Ser2HSCR0),
 323                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 324                 .flags  = IORESOURCE_MEM,
 325         }, {
 326                 .start  = __PREG(Ser2HSCR2),
 327                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 328                 .flags  = IORESOURCE_MEM,
 329         }, {
 330                 .start  = IRQ_Ser2ICP,
 331                 .end    = IRQ_Ser2ICP,
 332                 .flags  = IORESOURCE_IRQ,
 333         }
 334 };
 335
 336 static struct platform_device sa11x0ir_device = {
 337         .name           = "sa11x0-ir",
 338         .id             = -1,
 339         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 340         .resource       = sa11x0ir_resources,
 341 };
 342
 343 void sa11x0_register_irda(struct irda_platform_data *irda)
 344 {
 345         sa11x0_register_device(&sa11x0ir_device, irda);
 346 }
 347
 348 static struct resource sa1100_rtc_resources[] = {
 349         DEFINE_RES_MEM(0x90010000, 0x9001003f),
 350         DEFINE_RES_IRQ_NAMED(IRQ_RTC1Hz, "rtc 1Hz"),
 351         DEFINE_RES_IRQ_NAMED(IRQ_RTCAlrm, "rtc alarm"),
 352 };
 353
 354 static struct platform_device sa11x0rtc_device = {
 355         .name           = "sa1100-rtc",
 356         .id             = -1,
 357         .num_resources  = ARRAY_SIZE(sa1100_rtc_resources),
 358         .resource       = sa1100_rtc_resources,
 359 };
 360
 361 static struct platform_device *sa11x0_devices[] __initdata = {
 362         &sa11x0udc_device,
 363         &sa11x0uart1_device,
 364         &sa11x0uart3_device,
 365         &sa11x0ssp_device,
 366         &sa11x0pcmcia_device,
 367         &sa11x0fb_device,
 368         &sa11x0rtc_device,
 369 };
 370
 371 static int __init sa1100_init(void)
 372 {
 373         pm_power_off = sa1100_power_off;
 374         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 375 }
 376
 377 arch_initcall(sa1100_init);
 378
 379 void (*sa1100fb_backlight_power)(int on);
 380 void (*sa1100fb_lcd_power)(int on);
 381
 382 EXPORT_SYMBOL(sa1100fb_backlight_power);
 383 EXPORT_SYMBOL(sa1100fb_lcd_power);
 384
 385
 386 /*
 387  * Common I/O mapping:
 388  *
 389  * Typically, static virtual address mappings are as follow:
 390  *
 391  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 392  * 0xf4000000-0xf4ffffff:       SA-1111
 393  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 394  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 395  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 396  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 397  *
 398  * Below 0xe8000000 is reserved for vm allocation.
 399  *
 400  * The machine specific code must provide the extra mapping beside the
 401  * default mapping provided here.
 402  */
 403
 404 static struct map_desc standard_io_desc[] __initdata = {
 405         {       /* PCM */
 406                 .virtual        =  0xf8000000,
 407                 .pfn            = __phys_to_pfn(0x80000000),
 408                 .length         = 0x00100000,
 409                 .type           = MT_DEVICE
 410         }, {    /* SCM */
 411                 .virtual        =  0xfa000000,
 412                 .pfn            = __phys_to_pfn(0x90000000),
 413                 .length         = 0x00100000,
 414                 .type           = MT_DEVICE
 415         }, {    /* MER */
 416                 .virtual        =  0xfc000000,
 417                 .pfn            = __phys_to_pfn(0xa0000000),
 418                 .length         = 0x00100000,
 419                 .type           = MT_DEVICE
 420         }, {    /* LCD + DMA */
 421                 .virtual        =  0xfe000000,
 422                 .pfn            = __phys_to_pfn(0xb0000000),
 423                 .length         = 0x00200000,
 424                 .type           = MT_DEVICE
 425         },
 426 };
 427
 428 void __init sa1100_map_io(void)
 429 {
 430         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 431 }
 432
 433 /*
 434  * Disable the memory bus request/grant signals on the SA1110 to
 435  * ensure that we don't receive spurious memory requests.  We set
 436  * the MBGNT signal false to ensure the SA1111 doesn't own the
 437  * SDRAM bus.
 438  */
 439 void __init sa1110_mb_disable(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
 451         local_irq_restore(flags);
 452 }
 453
 454 /*
 455  * If the system is going to use the SA-1111 DMA engines, set up
 456  * the memory bus request/grant pins.
 457  */
 458 void __devinit sa1110_mb_enable(void)
 459 {
 460         unsigned long flags;
 461
 462         local_irq_save(flags);
 463
 464         PGSR &= ~GPIO_MBGNT;
 465         GPCR = GPIO_MBGNT;
 466         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 467
 468         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 469         TUCR |= TUCR_MR;
 470
 471         local_irq_restore(flags);
 472 }
 473