arch/arm/mach-realview/core.c

   1 /*
   2  *  linux/arch/arm/mach-realview/core.c
   3  *
   4  *  Copyright (C) 1999 - 2003 ARM Limited
   5  *  Copyright (C) 2000 Deep Blue Solutions Ltd
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/sysdev.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/amba/bus.h>
  27 #include <linux/amba/clcd.h>
  28 #include <linux/clocksource.h>
  29
  30 #include <asm/system.h>
  31 #include <asm/hardware.h>
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34 #include <asm/leds.h>
  35 #include <asm/hardware/arm_timer.h>
  36 #include <asm/hardware/icst307.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/flash.h>
  40 #include <asm/mach/irq.h>
  41 #include <asm/mach/time.h>
  42 #include <asm/mach/map.h>
  43 #include <asm/mach/mmc.h>
  44
  45 #include <asm/hardware/gic.h>
  46
  47 #include "core.h"
  48 #include "clock.h"
  49
  50 #define REALVIEW_REFCOUNTER     (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
  51
  52 /*
  53  * This is the RealView sched_clock implementation.  This has
  54  * a resolution of 41.7ns, and a maximum value of about 179s.
  55  */
  56 unsigned long long sched_clock(void)
  57 {
  58         unsigned long long v;
  59
  60         v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
  61         do_div(v, 3);
  62
  63         return v;
  64 }
  65
  66
  67 #define REALVIEW_FLASHCTRL    (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
  68
  69 static int realview_flash_init(void)
  70 {
  71         u32 val;
  72
  73         val = __raw_readl(REALVIEW_FLASHCTRL);
  74         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  75         __raw_writel(val, REALVIEW_FLASHCTRL);
  76
  77         return 0;
  78 }
  79
  80 static void realview_flash_exit(void)
  81 {
  82         u32 val;
  83
  84         val = __raw_readl(REALVIEW_FLASHCTRL);
  85         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  86         __raw_writel(val, REALVIEW_FLASHCTRL);
  87 }
  88
  89 static void realview_flash_set_vpp(int on)
  90 {
  91         u32 val;
  92
  93         val = __raw_readl(REALVIEW_FLASHCTRL);
  94         if (on)
  95                 val |= REALVIEW_FLASHPROG_FLVPPEN;
  96         else
  97                 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  98         __raw_writel(val, REALVIEW_FLASHCTRL);
  99 }
 100
 101 static struct flash_platform_data realview_flash_data = {
 102         .map_name               = "cfi_probe",
 103         .width                  = 4,
 104         .init                   = realview_flash_init,
 105         .exit                   = realview_flash_exit,
 106         .set_vpp                = realview_flash_set_vpp,
 107 };
 108
 109 static struct resource realview_flash_resource = {
 110         .start                  = REALVIEW_FLASH_BASE,
 111         .end                    = REALVIEW_FLASH_BASE + REALVIEW_FLASH_SIZE,
 112         .flags                  = IORESOURCE_MEM,
 113 };
 114
 115 struct platform_device realview_flash_device = {
 116         .name                   = "armflash",
 117         .id                     = 0,
 118         .dev                    = {
 119                 .platform_data  = &realview_flash_data,
 120         },
 121         .num_resources          = 1,
 122         .resource               = &realview_flash_resource,
 123 };
 124
 125 static struct resource realview_smc91x_resources[] = {
 126         [0] = {
 127                 .start          = REALVIEW_ETH_BASE,
 128                 .end            = REALVIEW_ETH_BASE + SZ_64K - 1,
 129                 .flags          = IORESOURCE_MEM,
 130         },
 131         [1] = {
 132                 .start          = IRQ_ETH,
 133                 .end            = IRQ_ETH,
 134                 .flags          = IORESOURCE_IRQ,
 135         },
 136 };
 137
 138 struct platform_device realview_smc91x_device = {
 139         .name           = "smc91x",
 140         .id             = 0,
 141         .num_resources  = ARRAY_SIZE(realview_smc91x_resources),
 142         .resource       = realview_smc91x_resources,
 143 };
 144
 145 static struct resource realview_i2c_resource = {
 146         .start          = REALVIEW_I2C_BASE,
 147         .end            = REALVIEW_I2C_BASE + SZ_4K - 1,
 148         .flags          = IORESOURCE_MEM,
 149 };
 150
 151 struct platform_device realview_i2c_device = {
 152         .name           = "versatile-i2c",
 153         .id             = -1,
 154         .num_resources  = 1,
 155         .resource       = &realview_i2c_resource,
 156 };
 157
 158 #define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
 159
 160 static unsigned int realview_mmc_status(struct device *dev)
 161 {
 162         struct amba_device *adev = container_of(dev, struct amba_device, dev);
 163         u32 mask;
 164
 165         if (adev->res.start == REALVIEW_MMCI0_BASE)
 166                 mask = 1;
 167         else
 168                 mask = 2;
 169
 170         return readl(REALVIEW_SYSMCI) & mask;
 171 }
 172
 173 struct mmc_platform_data realview_mmc0_plat_data = {
 174         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 175         .status         = realview_mmc_status,
 176 };
 177
 178 struct mmc_platform_data realview_mmc1_plat_data = {
 179         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 180         .status         = realview_mmc_status,
 181 };
 182
 183 /*
 184  * Clock handling
 185  */
 186 static const struct icst307_params realview_oscvco_params = {
 187         .ref            = 24000,
 188         .vco_max        = 200000,
 189         .vd_min         = 4 + 8,
 190         .vd_max         = 511 + 8,
 191         .rd_min         = 1 + 2,
 192         .rd_max         = 127 + 2,
 193 };
 194
 195 static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
 196 {
 197         void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
 198         void __iomem *sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
 199         u32 val;
 200
 201         val = readl(sys_osc) & ~0x7ffff;
 202         val |= vco.v | (vco.r << 9) | (vco.s << 16);
 203
 204         writel(0xa05f, sys_lock);
 205         writel(val, sys_osc);
 206         writel(0, sys_lock);
 207 }
 208
 209 struct clk realview_clcd_clk = {
 210         .name   = "CLCDCLK",
 211         .params = &realview_oscvco_params,
 212         .setvco = realview_oscvco_set,
 213 };
 214
 215 /*
 216  * CLCD support.
 217  */
 218 #define SYS_CLCD_NLCDIOON       (1 << 2)
 219 #define SYS_CLCD_VDDPOSSWITCH   (1 << 3)
 220 #define SYS_CLCD_PWR3V5SWITCH   (1 << 4)
 221 #define SYS_CLCD_ID_MASK        (0x1f << 8)
 222 #define SYS_CLCD_ID_SANYO_3_8   (0x00 << 8)
 223 #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
 224 #define SYS_CLCD_ID_EPSON_2_2   (0x02 << 8)
 225 #define SYS_CLCD_ID_SANYO_2_5   (0x07 << 8)
 226 #define SYS_CLCD_ID_VGA         (0x1f << 8)
 227
 228 static struct clcd_panel vga = {
 229         .mode           = {
 230                 .name           = "VGA",
 231                 .refresh        = 60,
 232                 .xres           = 640,
 233                 .yres           = 480,
 234                 .pixclock       = 39721,
 235                 .left_margin    = 40,
 236                 .right_margin   = 24,
 237                 .upper_margin   = 32,
 238                 .lower_margin   = 11,
 239                 .hsync_len      = 96,
 240                 .vsync_len      = 2,
 241                 .sync           = 0,
 242                 .vmode          = FB_VMODE_NONINTERLACED,
 243         },
 244         .width          = -1,
 245         .height         = -1,
 246         .tim2           = TIM2_BCD | TIM2_IPC,
 247         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 248         .bpp            = 16,
 249 };
 250
 251 static struct clcd_panel sanyo_3_8_in = {
 252         .mode           = {
 253                 .name           = "Sanyo QVGA",
 254                 .refresh        = 116,
 255                 .xres           = 320,
 256                 .yres           = 240,
 257                 .pixclock       = 100000,
 258                 .left_margin    = 6,
 259                 .right_margin   = 6,
 260                 .upper_margin   = 5,
 261                 .lower_margin   = 5,
 262                 .hsync_len      = 6,
 263                 .vsync_len      = 6,
 264                 .sync           = 0,
 265                 .vmode          = FB_VMODE_NONINTERLACED,
 266         },
 267         .width          = -1,
 268         .height         = -1,
 269         .tim2           = TIM2_BCD,
 270         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 271         .bpp            = 16,
 272 };
 273
 274 static struct clcd_panel sanyo_2_5_in = {
 275         .mode           = {
 276                 .name           = "Sanyo QVGA Portrait",
 277                 .refresh        = 116,
 278                 .xres           = 240,
 279                 .yres           = 320,
 280                 .pixclock       = 100000,
 281                 .left_margin    = 20,
 282                 .right_margin   = 10,
 283                 .upper_margin   = 2,
 284                 .lower_margin   = 2,
 285                 .hsync_len      = 10,
 286                 .vsync_len      = 2,
 287                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 288                 .vmode          = FB_VMODE_NONINTERLACED,
 289         },
 290         .width          = -1,
 291         .height         = -1,
 292         .tim2           = TIM2_IVS | TIM2_IHS | TIM2_IPC,
 293         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 294         .bpp            = 16,
 295 };
 296
 297 static struct clcd_panel epson_2_2_in = {
 298         .mode           = {
 299                 .name           = "Epson QCIF",
 300                 .refresh        = 390,
 301                 .xres           = 176,
 302                 .yres           = 220,
 303                 .pixclock       = 62500,
 304                 .left_margin    = 3,
 305                 .right_margin   = 2,
 306                 .upper_margin   = 1,
 307                 .lower_margin   = 0,
 308                 .hsync_len      = 3,
 309                 .vsync_len      = 2,
 310                 .sync           = 0,
 311                 .vmode          = FB_VMODE_NONINTERLACED,
 312         },
 313         .width          = -1,
 314         .height         = -1,
 315         .tim2           = TIM2_BCD | TIM2_IPC,
 316         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 317         .bpp            = 16,
 318 };
 319
 320 /*
 321  * Detect which LCD panel is connected, and return the appropriate
 322  * clcd_panel structure.  Note: we do not have any information on
 323  * the required timings for the 8.4in panel, so we presently assume
 324  * VGA timings.
 325  */
 326 static struct clcd_panel *realview_clcd_panel(void)
 327 {
 328         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 329         struct clcd_panel *panel = &vga;
 330         u32 val;
 331
 332         val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
 333         if (val == SYS_CLCD_ID_SANYO_3_8)
 334                 panel = &sanyo_3_8_in;
 335         else if (val == SYS_CLCD_ID_SANYO_2_5)
 336                 panel = &sanyo_2_5_in;
 337         else if (val == SYS_CLCD_ID_EPSON_2_2)
 338                 panel = &epson_2_2_in;
 339         else if (val == SYS_CLCD_ID_VGA)
 340                 panel = &vga;
 341         else {
 342                 printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
 343                         val);
 344                 panel = &vga;
 345         }
 346
 347         return panel;
 348 }
 349
 350 /*
 351  * Disable all display connectors on the interface module.
 352  */
 353 static void realview_clcd_disable(struct clcd_fb *fb)
 354 {
 355         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 356         u32 val;
 357
 358         val = readl(sys_clcd);
 359         val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 360         writel(val, sys_clcd);
 361 }
 362
 363 /*
 364  * Enable the relevant connector on the interface module.
 365  */
 366 static void realview_clcd_enable(struct clcd_fb *fb)
 367 {
 368         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 369         u32 val;
 370
 371         /*
 372          * Enable the PSUs
 373          */
 374         val = readl(sys_clcd);
 375         val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 376         writel(val, sys_clcd);
 377 }
 378
 379 static unsigned long framesize = SZ_1M;
 380
 381 static int realview_clcd_setup(struct clcd_fb *fb)
 382 {
 383         dma_addr_t dma;
 384
 385         fb->panel               = realview_clcd_panel();
 386
 387         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
 388                                                     &dma, GFP_KERNEL);
 389         if (!fb->fb.screen_base) {
 390                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 391                 return -ENOMEM;
 392         }
 393
 394         fb->fb.fix.smem_start   = dma;
 395         fb->fb.fix.smem_len     = framesize;
 396
 397         return 0;
 398 }
 399
 400 static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 401 {
 402         return dma_mmap_writecombine(&fb->dev->dev, vma,
 403                                      fb->fb.screen_base,
 404                                      fb->fb.fix.smem_start,
 405                                      fb->fb.fix.smem_len);
 406 }
 407
 408 static void realview_clcd_remove(struct clcd_fb *fb)
 409 {
 410         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 411                               fb->fb.screen_base, fb->fb.fix.smem_start);
 412 }
 413
 414 struct clcd_board clcd_plat_data = {
 415         .name           = "RealView",
 416         .check          = clcdfb_check,
 417         .decode         = clcdfb_decode,
 418         .disable        = realview_clcd_disable,
 419         .enable         = realview_clcd_enable,
 420         .setup          = realview_clcd_setup,
 421         .mmap           = realview_clcd_mmap,
 422         .remove         = realview_clcd_remove,
 423 };
 424
 425 #ifdef CONFIG_LEDS
 426 #define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
 427
 428 void realview_leds_event(led_event_t ledevt)
 429 {
 430         unsigned long flags;
 431         u32 val;
 432
 433         local_irq_save(flags);
 434         val = readl(VA_LEDS_BASE);
 435
 436         switch (ledevt) {
 437         case led_idle_start:
 438                 val = val & ~REALVIEW_SYS_LED0;
 439                 break;
 440
 441         case led_idle_end:
 442                 val = val | REALVIEW_SYS_LED0;
 443                 break;
 444
 445         case led_timer:
 446                 val = val ^ REALVIEW_SYS_LED1;
 447                 break;
 448
 449         case led_halted:
 450                 val = 0;
 451                 break;
 452
 453         default:
 454                 break;
 455         }
 456
 457         writel(val, VA_LEDS_BASE);
 458         local_irq_restore(flags);
 459 }
 460 #endif  /* CONFIG_LEDS */
 461
 462 /*
 463  * Where is the timer (VA)?
 464  */
 465 #define TIMER0_VA_BASE           __io_address(REALVIEW_TIMER0_1_BASE)
 466 #define TIMER1_VA_BASE          (__io_address(REALVIEW_TIMER0_1_BASE) + 0x20)
 467 #define TIMER2_VA_BASE           __io_address(REALVIEW_TIMER2_3_BASE)
 468 #define TIMER3_VA_BASE          (__io_address(REALVIEW_TIMER2_3_BASE) + 0x20)
 469
 470 /*
 471  * How long is the timer interval?
 472  */
 473 #define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_10)
 474 #if TIMER_INTERVAL >= 0x100000
 475 #define TIMER_RELOAD    (TIMER_INTERVAL >> 8)
 476 #define TIMER_DIVISOR   (TIMER_CTRL_DIV256)
 477 #define TICKS2USECS(x)  (256 * (x) / TICKS_PER_uSEC)
 478 #elif TIMER_INTERVAL >= 0x10000
 479 #define TIMER_RELOAD    (TIMER_INTERVAL >> 4)           /* Divide by 16 */
 480 #define TIMER_DIVISOR   (TIMER_CTRL_DIV16)
 481 #define TICKS2USECS(x)  (16 * (x) / TICKS_PER_uSEC)
 482 #else
 483 #define TIMER_RELOAD    (TIMER_INTERVAL)
 484 #define TIMER_DIVISOR   (TIMER_CTRL_DIV1)
 485 #define TICKS2USECS(x)  ((x) / TICKS_PER_uSEC)
 486 #endif
 487
 488 /*
 489  * IRQ handler for the timer
 490  */
 491 static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
 492 {
 493         // ...clear the interrupt
 494         writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
 495
 496         timer_tick();
 497
 498 #if defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS)
 499         smp_send_timer();
 500         update_process_times(user_mode(get_irq_regs()));
 501 #endif
 502
 503         return IRQ_HANDLED;
 504 }
 505
 506 static struct irqaction realview_timer_irq = {
 507         .name           = "RealView Timer Tick",
 508         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 509         .handler        = realview_timer_interrupt,
 510 };
 511
 512 static cycle_t realview_get_cycles(void)
 513 {
 514         return ~readl(TIMER3_VA_BASE + TIMER_VALUE);
 515 }
 516
 517 static struct clocksource clocksource_realview = {
 518         .name   = "timer3",
 519         .rating = 200,
 520         .read   = realview_get_cycles,
 521         .mask   = CLOCKSOURCE_MASK(32),
 522         .shift  = 20,
 523         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 524 };
 525
 526 static void __init realview_clocksource_init(void)
 527 {
 528         /* setup timer 0 as free-running clocksource */
 529         writel(0, TIMER3_VA_BASE + TIMER_CTRL);
 530         writel(0xffffffff, TIMER3_VA_BASE + TIMER_LOAD);
 531         writel(0xffffffff, TIMER3_VA_BASE + TIMER_VALUE);
 532         writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
 533                 TIMER3_VA_BASE + TIMER_CTRL);
 534
 535         clocksource_realview.mult =
 536                 clocksource_khz2mult(1000, clocksource_realview.shift);
 537         clocksource_register(&clocksource_realview);
 538 }
 539
 540 /*
 541  * Set up timer interrupt, and return the current time in seconds.
 542  */
 543 static void __init realview_timer_init(void)
 544 {
 545         u32 val;
 546
 547         /*
 548          * set clock frequency:
 549          *      REALVIEW_REFCLK is 32KHz
 550          *      REALVIEW_TIMCLK is 1MHz
 551          */
 552         val = readl(__io_address(REALVIEW_SCTL_BASE));
 553         writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
 554                (REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) |
 555                (REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
 556                (REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
 557                __io_address(REALVIEW_SCTL_BASE));
 558
 559         /*
 560          * Initialise to a known state (all timers off)
 561          */
 562         writel(0, TIMER0_VA_BASE + TIMER_CTRL);
 563         writel(0, TIMER1_VA_BASE + TIMER_CTRL);
 564         writel(0, TIMER2_VA_BASE + TIMER_CTRL);
 565         writel(0, TIMER3_VA_BASE + TIMER_CTRL);
 566
 567         writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
 568         writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_VALUE);
 569         writel(TIMER_DIVISOR | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC |
 570                TIMER_CTRL_IE, TIMER0_VA_BASE + TIMER_CTRL);
 571
 572         /*
 573          * Make irqs happen for the system timer
 574          */
 575         setup_irq(IRQ_TIMERINT0_1, &realview_timer_irq);
 576
 577         realview_clocksource_init();
 578 }
 579
 580 struct sys_timer realview_timer = {
 581         .init           = realview_timer_init,
 582 };