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 <video/sa1100fb.h>
  23
  24 #include <asm/div64.h>
  25 #include <mach/hardware.h>
  26 #include <asm/system.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/flash.h>
  29 #include <asm/irq.h>
  30
  31 #include "generic.h"
  32
  33 unsigned int reset_status;
  34 EXPORT_SYMBOL(reset_status);
  35
  36 #define NR_FREQS        16
  37
  38 /*
  39  * This table is setup for a 3.6864MHz Crystal.
  40  */
  41 static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
  42          590,   /*  59.0 MHz */
  43          737,   /*  73.7 MHz */
  44          885,   /*  88.5 MHz */
  45         1032,   /* 103.2 MHz */
  46         1180,   /* 118.0 MHz */
  47         1327,   /* 132.7 MHz */
  48         1475,   /* 147.5 MHz */
  49         1622,   /* 162.2 MHz */
  50         1769,   /* 176.9 MHz */
  51         1917,   /* 191.7 MHz */
  52         2064,   /* 206.4 MHz */
  53         2212,   /* 221.2 MHz */
  54         2359,   /* 235.9 MHz */
  55         2507,   /* 250.7 MHz */
  56         2654,   /* 265.4 MHz */
  57         2802    /* 280.2 MHz */
  58 };
  59
  60 /* rounds up(!)  */
  61 unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
  62 {
  63         int i;
  64
  65         khz /= 100;
  66
  67         for (i = 0; i < NR_FREQS; i++)
  68                 if (cclk_frequency_100khz[i] >= khz)
  69                         break;
  70
  71         return i;
  72 }
  73
  74 unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
  75 {
  76         unsigned int freq = 0;
  77         if (idx < NR_FREQS)
  78                 freq = cclk_frequency_100khz[idx] * 100;
  79         return freq;
  80 }
  81
  82
  83 /* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
  84  * this platform, anyway.
  85  */
  86 int sa11x0_verify_speed(struct cpufreq_policy *policy)
  87 {
  88         unsigned int tmp;
  89         if (policy->cpu)
  90                 return -EINVAL;
  91
  92         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  93
  94         /* make sure that at least one frequency is within the policy */
  95         tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
  96         if (tmp > policy->max)
  97                 policy->max = tmp;
  98
  99         cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
 100
 101         return 0;
 102 }
 103
 104 unsigned int sa11x0_getspeed(unsigned int cpu)
 105 {
 106         if (cpu)
 107                 return 0;
 108         return cclk_frequency_100khz[PPCR & 0xf] * 100;
 109 }
 110
 111 /*
 112  * Default power-off for SA1100
 113  */
 114 static void sa1100_power_off(void)
 115 {
 116         mdelay(100);
 117         local_irq_disable();
 118         /* disable internal oscillator, float CS lines */
 119         PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
 120         /* enable wake-up on GPIO0 (Assabet...) */
 121         PWER = GFER = GRER = 1;
 122         /*
 123          * set scratchpad to zero, just in case it is used as a
 124          * restart address by the bootloader.
 125          */
 126         PSPR = 0;
 127         /* enter sleep mode */
 128         PMCR = PMCR_SF;
 129 }
 130
 131 void sa11x0_restart(char mode, const char *cmd)
 132 {
 133         if (mode == 's') {
 134                 /* Jump into ROM at address 0 */
 135                 soft_restart(0);
 136         } else {
 137                 /* Use on-chip reset capability */
 138                 RSRR = RSRR_SWR;
 139         }
 140 }
 141
 142 static void sa11x0_register_device(struct platform_device *dev, void *data)
 143 {
 144         int err;
 145         dev->dev.platform_data = data;
 146         err = platform_device_register(dev);
 147         if (err)
 148                 printk(KERN_ERR "Unable to register device %s: %d\n",
 149                         dev->name, err);
 150 }
 151
 152
 153 static struct resource sa11x0udc_resources[] = {
 154         [0] = {
 155                 .start  = __PREG(Ser0UDCCR),
 156                 .end    = __PREG(Ser0UDCCR) + 0xffff,
 157                 .flags  = IORESOURCE_MEM,
 158         },
 159         [1] = {
 160                 .start  = IRQ_Ser0UDC,
 161                 .end    = IRQ_Ser0UDC,
 162                 .flags  = IORESOURCE_IRQ,
 163         },
 164 };
 165
 166 static u64 sa11x0udc_dma_mask = 0xffffffffUL;
 167
 168 static struct platform_device sa11x0udc_device = {
 169         .name           = "sa11x0-udc",
 170         .id             = -1,
 171         .dev            = {
 172                 .dma_mask = &sa11x0udc_dma_mask,
 173                 .coherent_dma_mask = 0xffffffff,
 174         },
 175         .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
 176         .resource       = sa11x0udc_resources,
 177 };
 178
 179 static struct resource sa11x0uart1_resources[] = {
 180         [0] = {
 181                 .start  = __PREG(Ser1UTCR0),
 182                 .end    = __PREG(Ser1UTCR0) + 0xffff,
 183                 .flags  = IORESOURCE_MEM,
 184         },
 185         [1] = {
 186                 .start  = IRQ_Ser1UART,
 187                 .end    = IRQ_Ser1UART,
 188                 .flags  = IORESOURCE_IRQ,
 189         },
 190 };
 191
 192 static struct platform_device sa11x0uart1_device = {
 193         .name           = "sa11x0-uart",
 194         .id             = 1,
 195         .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
 196         .resource       = sa11x0uart1_resources,
 197 };
 198
 199 static struct resource sa11x0uart3_resources[] = {
 200         [0] = {
 201                 .start  = __PREG(Ser3UTCR0),
 202                 .end    = __PREG(Ser3UTCR0) + 0xffff,
 203                 .flags  = IORESOURCE_MEM,
 204         },
 205         [1] = {
 206                 .start  = IRQ_Ser3UART,
 207                 .end    = IRQ_Ser3UART,
 208                 .flags  = IORESOURCE_IRQ,
 209         },
 210 };
 211
 212 static struct platform_device sa11x0uart3_device = {
 213         .name           = "sa11x0-uart",
 214         .id             = 3,
 215         .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
 216         .resource       = sa11x0uart3_resources,
 217 };
 218
 219 static struct resource sa11x0mcp_resources[] = {
 220         [0] = {
 221                 .start  = __PREG(Ser4MCCR0),
 222                 .end    = __PREG(Ser4MCCR0) + 0xffff,
 223                 .flags  = IORESOURCE_MEM,
 224         },
 225         [1] = {
 226                 .start  = IRQ_Ser4MCP,
 227                 .end    = IRQ_Ser4MCP,
 228                 .flags  = IORESOURCE_IRQ,
 229         },
 230 };
 231
 232 static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
 233
 234 static struct platform_device sa11x0mcp_device = {
 235         .name           = "sa11x0-mcp",
 236         .id             = -1,
 237         .dev = {
 238                 .dma_mask = &sa11x0mcp_dma_mask,
 239                 .coherent_dma_mask = 0xffffffff,
 240         },
 241         .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
 242         .resource       = sa11x0mcp_resources,
 243 };
 244
 245 void sa11x0_register_mcp(struct mcp_plat_data *data)
 246 {
 247         sa11x0_register_device(&sa11x0mcp_device, data);
 248 }
 249
 250 static struct resource sa11x0ssp_resources[] = {
 251         [0] = {
 252                 .start  = 0x80070000,
 253                 .end    = 0x8007ffff,
 254                 .flags  = IORESOURCE_MEM,
 255         },
 256         [1] = {
 257                 .start  = IRQ_Ser4SSP,
 258                 .end    = IRQ_Ser4SSP,
 259                 .flags  = IORESOURCE_IRQ,
 260         },
 261 };
 262
 263 static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 264
 265 static struct platform_device sa11x0ssp_device = {
 266         .name           = "sa11x0-ssp",
 267         .id             = -1,
 268         .dev = {
 269                 .dma_mask = &sa11x0ssp_dma_mask,
 270                 .coherent_dma_mask = 0xffffffff,
 271         },
 272         .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 273         .resource       = sa11x0ssp_resources,
 274 };
 275
 276 static struct resource sa11x0fb_resources[] = {
 277         [0] = {
 278                 .start  = 0xb0100000,
 279                 .end    = 0xb010ffff,
 280                 .flags  = IORESOURCE_MEM,
 281         },
 282         [1] = {
 283                 .start  = IRQ_LCD,
 284                 .end    = IRQ_LCD,
 285                 .flags  = IORESOURCE_IRQ,
 286         },
 287 };
 288
 289 static struct platform_device sa11x0fb_device = {
 290         .name           = "sa11x0-fb",
 291         .id             = -1,
 292         .dev = {
 293                 .coherent_dma_mask = 0xffffffff,
 294         },
 295         .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 296         .resource       = sa11x0fb_resources,
 297 };
 298
 299 void sa11x0_register_lcd(struct sa1100fb_mach_info *inf)
 300 {
 301         sa11x0_register_device(&sa11x0fb_device, inf);
 302 }
 303
 304 static struct platform_device sa11x0pcmcia_device = {
 305         .name           = "sa11x0-pcmcia",
 306         .id             = -1,
 307 };
 308
 309 static struct platform_device sa11x0mtd_device = {
 310         .name           = "sa1100-mtd",
 311         .id             = -1,
 312 };
 313
 314 void sa11x0_register_mtd(struct flash_platform_data *flash,
 315                          struct resource *res, int nr)
 316 {
 317         flash->name = "sa1100";
 318         sa11x0mtd_device.resource = res;
 319         sa11x0mtd_device.num_resources = nr;
 320         sa11x0_register_device(&sa11x0mtd_device, flash);
 321 }
 322
 323 static struct resource sa11x0ir_resources[] = {
 324         {
 325                 .start  = __PREG(Ser2UTCR0),
 326                 .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 327                 .flags  = IORESOURCE_MEM,
 328         }, {
 329                 .start  = __PREG(Ser2HSCR0),
 330                 .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 331                 .flags  = IORESOURCE_MEM,
 332         }, {
 333                 .start  = __PREG(Ser2HSCR2),
 334                 .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 335                 .flags  = IORESOURCE_MEM,
 336         }, {
 337                 .start  = IRQ_Ser2ICP,
 338                 .end    = IRQ_Ser2ICP,
 339                 .flags  = IORESOURCE_IRQ,
 340         }
 341 };
 342
 343 static struct platform_device sa11x0ir_device = {
 344         .name           = "sa11x0-ir",
 345         .id             = -1,
 346         .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 347         .resource       = sa11x0ir_resources,
 348 };
 349
 350 void sa11x0_register_irda(struct irda_platform_data *irda)
 351 {
 352         sa11x0_register_device(&sa11x0ir_device, irda);
 353 }
 354
 355 static struct platform_device sa11x0rtc_device = {
 356         .name           = "sa1100-rtc",
 357         .id             = -1,
 358 };
 359
 360 static struct platform_device *sa11x0_devices[] __initdata = {
 361         &sa11x0udc_device,
 362         &sa11x0uart1_device,
 363         &sa11x0uart3_device,
 364         &sa11x0ssp_device,
 365         &sa11x0pcmcia_device,
 366         &sa11x0rtc_device,
 367 };
 368
 369 static int __init sa1100_init(void)
 370 {
 371         pm_power_off = sa1100_power_off;
 372         return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 373 }
 374
 375 arch_initcall(sa1100_init);
 376
 377
 378 /*
 379  * Common I/O mapping:
 380  *
 381  * Typically, static virtual address mappings are as follow:
 382  *
 383  * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 384  * 0xf4000000-0xf4ffffff:       SA-1111
 385  * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 386  * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 387  * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 388  * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 389  *
 390  * Below 0xe8000000 is reserved for vm allocation.
 391  *
 392  * The machine specific code must provide the extra mapping beside the
 393  * default mapping provided here.
 394  */
 395
 396 static struct map_desc standard_io_desc[] __initdata = {
 397         {       /* PCM */
 398                 .virtual        =  0xf8000000,
 399                 .pfn            = __phys_to_pfn(0x80000000),
 400                 .length         = 0x00100000,
 401                 .type           = MT_DEVICE
 402         }, {    /* SCM */
 403                 .virtual        =  0xfa000000,
 404                 .pfn            = __phys_to_pfn(0x90000000),
 405                 .length         = 0x00100000,
 406                 .type           = MT_DEVICE
 407         }, {    /* MER */
 408                 .virtual        =  0xfc000000,
 409                 .pfn            = __phys_to_pfn(0xa0000000),
 410                 .length         = 0x00100000,
 411                 .type           = MT_DEVICE
 412         }, {    /* LCD + DMA */
 413                 .virtual        =  0xfe000000,
 414                 .pfn            = __phys_to_pfn(0xb0000000),
 415                 .length         = 0x00200000,
 416                 .type           = MT_DEVICE
 417         },
 418 };
 419
 420 void __init sa1100_map_io(void)
 421 {
 422         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 423 }
 424
 425 /*
 426  * Disable the memory bus request/grant signals on the SA1110 to
 427  * ensure that we don't receive spurious memory requests.  We set
 428  * the MBGNT signal false to ensure the SA1111 doesn't own the
 429  * SDRAM bus.
 430  */
 431 void __init sa1110_mb_disable(void)
 432 {
 433         unsigned long flags;
 434
 435         local_irq_save(flags);
 436
 437         PGSR &= ~GPIO_MBGNT;
 438         GPCR = GPIO_MBGNT;
 439         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 440
 441         GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
 442
 443         local_irq_restore(flags);
 444 }
 445
 446 /*
 447  * If the system is going to use the SA-1111 DMA engines, set up
 448  * the memory bus request/grant pins.
 449  */
 450 void __devinit sa1110_mb_enable(void)
 451 {
 452         unsigned long flags;
 453
 454         local_irq_save(flags);
 455
 456         PGSR &= ~GPIO_MBGNT;
 457         GPCR = GPIO_MBGNT;
 458         GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 459
 460         GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 461         TUCR |= TUCR_MR;
 462
 463         local_irq_restore(flags);
 464 }
 465