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   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 #include <linux/clockchips.h>
  30
  31 #include <asm/system.h>
  32 #include <asm/hardware.h>
  33 #include <asm/io.h>
  34 #include <asm/irq.h>
  35 #include <asm/leds.h>
  36 #include <asm/hardware/arm_timer.h>
  37 #include <asm/hardware/icst307.h>
  38
  39 #include <asm/mach/arch.h>
  40 #include <asm/mach/flash.h>
  41 #include <asm/mach/irq.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 /* used by entry-macro.S */
  53 void __iomem *gic_cpu_base_addr;
  54
  55 /*
  56  * This is the RealView sched_clock implementation.  This has
  57  * a resolution of 41.7ns, and a maximum value of about 179s.
  58  */
  59 unsigned long long sched_clock(void)
  60 {
  61         unsigned long long v;
  62
  63         v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
  64         do_div(v, 3);
  65
  66         return v;
  67 }
  68
  69
  70 #define REALVIEW_FLASHCTRL    (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
  71
  72 static int realview_flash_init(void)
  73 {
  74         u32 val;
  75
  76         val = __raw_readl(REALVIEW_FLASHCTRL);
  77         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  78         __raw_writel(val, REALVIEW_FLASHCTRL);
  79
  80         return 0;
  81 }
  82
  83 static void realview_flash_exit(void)
  84 {
  85         u32 val;
  86
  87         val = __raw_readl(REALVIEW_FLASHCTRL);
  88         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  89         __raw_writel(val, REALVIEW_FLASHCTRL);
  90 }
  91
  92 static void realview_flash_set_vpp(int on)
  93 {
  94         u32 val;
  95
  96         val = __raw_readl(REALVIEW_FLASHCTRL);
  97         if (on)
  98                 val |= REALVIEW_FLASHPROG_FLVPPEN;
  99         else
 100                 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
 101         __raw_writel(val, REALVIEW_FLASHCTRL);
 102 }
 103
 104 static struct flash_platform_data realview_flash_data = {
 105         .map_name               = "cfi_probe",
 106         .width                  = 4,
 107         .init                   = realview_flash_init,
 108         .exit                   = realview_flash_exit,
 109         .set_vpp                = realview_flash_set_vpp,
 110 };
 111
 112 struct platform_device realview_flash_device = {
 113         .name                   = "armflash",
 114         .id                     = 0,
 115         .dev                    = {
 116                 .platform_data  = &realview_flash_data,
 117         },
 118 };
 119
 120 int realview_flash_register(struct resource *res, u32 num)
 121 {
 122         realview_flash_device.resource = res;
 123         realview_flash_device.num_resources = num;
 124         return platform_device_register(&realview_flash_device);
 125 }
 126
 127 static struct resource realview_i2c_resource = {
 128         .start          = REALVIEW_I2C_BASE,
 129         .end            = REALVIEW_I2C_BASE + SZ_4K - 1,
 130         .flags          = IORESOURCE_MEM,
 131 };
 132
 133 struct platform_device realview_i2c_device = {
 134         .name           = "versatile-i2c",
 135         .id             = -1,
 136         .num_resources  = 1,
 137         .resource       = &realview_i2c_resource,
 138 };
 139
 140 #define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
 141
 142 static unsigned int realview_mmc_status(struct device *dev)
 143 {
 144         struct amba_device *adev = container_of(dev, struct amba_device, dev);
 145         u32 mask;
 146
 147         if (adev->res.start == REALVIEW_MMCI0_BASE)
 148                 mask = 1;
 149         else
 150                 mask = 2;
 151
 152         return readl(REALVIEW_SYSMCI) & mask;
 153 }
 154
 155 struct mmc_platform_data realview_mmc0_plat_data = {
 156         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 157         .status         = realview_mmc_status,
 158 };
 159
 160 struct mmc_platform_data realview_mmc1_plat_data = {
 161         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 162         .status         = realview_mmc_status,
 163 };
 164
 165 /*
 166  * Clock handling
 167  */
 168 static const struct icst307_params realview_oscvco_params = {
 169         .ref            = 24000,
 170         .vco_max        = 200000,
 171         .vd_min         = 4 + 8,
 172         .vd_max         = 511 + 8,
 173         .rd_min         = 1 + 2,
 174         .rd_max         = 127 + 2,
 175 };
 176
 177 static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
 178 {
 179         void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
 180         void __iomem *sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
 181         u32 val;
 182
 183         val = readl(sys_osc) & ~0x7ffff;
 184         val |= vco.v | (vco.r << 9) | (vco.s << 16);
 185
 186         writel(0xa05f, sys_lock);
 187         writel(val, sys_osc);
 188         writel(0, sys_lock);
 189 }
 190
 191 struct clk realview_clcd_clk = {
 192         .name   = "CLCDCLK",
 193         .params = &realview_oscvco_params,
 194         .setvco = realview_oscvco_set,
 195 };
 196
 197 /*
 198  * CLCD support.
 199  */
 200 #define SYS_CLCD_NLCDIOON       (1 << 2)
 201 #define SYS_CLCD_VDDPOSSWITCH   (1 << 3)
 202 #define SYS_CLCD_PWR3V5SWITCH   (1 << 4)
 203 #define SYS_CLCD_ID_MASK        (0x1f << 8)
 204 #define SYS_CLCD_ID_SANYO_3_8   (0x00 << 8)
 205 #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
 206 #define SYS_CLCD_ID_EPSON_2_2   (0x02 << 8)
 207 #define SYS_CLCD_ID_SANYO_2_5   (0x07 << 8)
 208 #define SYS_CLCD_ID_VGA         (0x1f << 8)
 209
 210 static struct clcd_panel vga = {
 211         .mode           = {
 212                 .name           = "VGA",
 213                 .refresh        = 60,
 214                 .xres           = 640,
 215                 .yres           = 480,
 216                 .pixclock       = 39721,
 217                 .left_margin    = 40,
 218                 .right_margin   = 24,
 219                 .upper_margin   = 32,
 220                 .lower_margin   = 11,
 221                 .hsync_len      = 96,
 222                 .vsync_len      = 2,
 223                 .sync           = 0,
 224                 .vmode          = FB_VMODE_NONINTERLACED,
 225         },
 226         .width          = -1,
 227         .height         = -1,
 228         .tim2           = TIM2_BCD | TIM2_IPC,
 229         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 230         .bpp            = 16,
 231 };
 232
 233 static struct clcd_panel sanyo_3_8_in = {
 234         .mode           = {
 235                 .name           = "Sanyo QVGA",
 236                 .refresh        = 116,
 237                 .xres           = 320,
 238                 .yres           = 240,
 239                 .pixclock       = 100000,
 240                 .left_margin    = 6,
 241                 .right_margin   = 6,
 242                 .upper_margin   = 5,
 243                 .lower_margin   = 5,
 244                 .hsync_len      = 6,
 245                 .vsync_len      = 6,
 246                 .sync           = 0,
 247                 .vmode          = FB_VMODE_NONINTERLACED,
 248         },
 249         .width          = -1,
 250         .height         = -1,
 251         .tim2           = TIM2_BCD,
 252         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 253         .bpp            = 16,
 254 };
 255
 256 static struct clcd_panel sanyo_2_5_in = {
 257         .mode           = {
 258                 .name           = "Sanyo QVGA Portrait",
 259                 .refresh        = 116,
 260                 .xres           = 240,
 261                 .yres           = 320,
 262                 .pixclock       = 100000,
 263                 .left_margin    = 20,
 264                 .right_margin   = 10,
 265                 .upper_margin   = 2,
 266                 .lower_margin   = 2,
 267                 .hsync_len      = 10,
 268                 .vsync_len      = 2,
 269                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 270                 .vmode          = FB_VMODE_NONINTERLACED,
 271         },
 272         .width          = -1,
 273         .height         = -1,
 274         .tim2           = TIM2_IVS | TIM2_IHS | TIM2_IPC,
 275         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 276         .bpp            = 16,
 277 };
 278
 279 static struct clcd_panel epson_2_2_in = {
 280         .mode           = {
 281                 .name           = "Epson QCIF",
 282                 .refresh        = 390,
 283                 .xres           = 176,
 284                 .yres           = 220,
 285                 .pixclock       = 62500,
 286                 .left_margin    = 3,
 287                 .right_margin   = 2,
 288                 .upper_margin   = 1,
 289                 .lower_margin   = 0,
 290                 .hsync_len      = 3,
 291                 .vsync_len      = 2,
 292                 .sync           = 0,
 293                 .vmode          = FB_VMODE_NONINTERLACED,
 294         },
 295         .width          = -1,
 296         .height         = -1,
 297         .tim2           = TIM2_BCD | TIM2_IPC,
 298         .cntl           = CNTL_LCDTFT | CNTL_LCDVCOMP(1),
 299         .bpp            = 16,
 300 };
 301
 302 /*
 303  * Detect which LCD panel is connected, and return the appropriate
 304  * clcd_panel structure.  Note: we do not have any information on
 305  * the required timings for the 8.4in panel, so we presently assume
 306  * VGA timings.
 307  */
 308 static struct clcd_panel *realview_clcd_panel(void)
 309 {
 310         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 311         struct clcd_panel *panel = &vga;
 312         u32 val;
 313
 314         val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
 315         if (val == SYS_CLCD_ID_SANYO_3_8)
 316                 panel = &sanyo_3_8_in;
 317         else if (val == SYS_CLCD_ID_SANYO_2_5)
 318                 panel = &sanyo_2_5_in;
 319         else if (val == SYS_CLCD_ID_EPSON_2_2)
 320                 panel = &epson_2_2_in;
 321         else if (val == SYS_CLCD_ID_VGA)
 322                 panel = &vga;
 323         else {
 324                 printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
 325                         val);
 326                 panel = &vga;
 327         }
 328
 329         return panel;
 330 }
 331
 332 /*
 333  * Disable all display connectors on the interface module.
 334  */
 335 static void realview_clcd_disable(struct clcd_fb *fb)
 336 {
 337         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 338         u32 val;
 339
 340         val = readl(sys_clcd);
 341         val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 342         writel(val, sys_clcd);
 343 }
 344
 345 /*
 346  * Enable the relevant connector on the interface module.
 347  */
 348 static void realview_clcd_enable(struct clcd_fb *fb)
 349 {
 350         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 351         u32 val;
 352
 353         /*
 354          * Enable the PSUs
 355          */
 356         val = readl(sys_clcd);
 357         val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 358         writel(val, sys_clcd);
 359 }
 360
 361 static unsigned long framesize = SZ_1M;
 362
 363 static int realview_clcd_setup(struct clcd_fb *fb)
 364 {
 365         dma_addr_t dma;
 366
 367         fb->panel               = realview_clcd_panel();
 368
 369         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
 370                                                     &dma, GFP_KERNEL);
 371         if (!fb->fb.screen_base) {
 372                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 373                 return -ENOMEM;
 374         }
 375
 376         fb->fb.fix.smem_start   = dma;
 377         fb->fb.fix.smem_len     = framesize;
 378
 379         return 0;
 380 }
 381
 382 static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 383 {
 384         return dma_mmap_writecombine(&fb->dev->dev, vma,
 385                                      fb->fb.screen_base,
 386                                      fb->fb.fix.smem_start,
 387                                      fb->fb.fix.smem_len);
 388 }
 389
 390 static void realview_clcd_remove(struct clcd_fb *fb)
 391 {
 392         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 393                               fb->fb.screen_base, fb->fb.fix.smem_start);
 394 }
 395
 396 struct clcd_board clcd_plat_data = {
 397         .name           = "RealView",
 398         .check          = clcdfb_check,
 399         .decode         = clcdfb_decode,
 400         .disable        = realview_clcd_disable,
 401         .enable         = realview_clcd_enable,
 402         .setup          = realview_clcd_setup,
 403         .mmap           = realview_clcd_mmap,
 404         .remove         = realview_clcd_remove,
 405 };
 406
 407 #ifdef CONFIG_LEDS
 408 #define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
 409
 410 void realview_leds_event(led_event_t ledevt)
 411 {
 412         unsigned long flags;
 413         u32 val;
 414
 415         local_irq_save(flags);
 416         val = readl(VA_LEDS_BASE);
 417
 418         switch (ledevt) {
 419         case led_idle_start:
 420                 val = val & ~REALVIEW_SYS_LED0;
 421                 break;
 422
 423         case led_idle_end:
 424                 val = val | REALVIEW_SYS_LED0;
 425                 break;
 426
 427         case led_timer:
 428                 val = val ^ REALVIEW_SYS_LED1;
 429                 break;
 430
 431         case led_halted:
 432                 val = 0;
 433                 break;
 434
 435         default:
 436                 break;
 437         }
 438
 439         writel(val, VA_LEDS_BASE);
 440         local_irq_restore(flags);
 441 }
 442 #endif  /* CONFIG_LEDS */
 443
 444 /*
 445  * Where is the timer (VA)?
 446  */
 447 void __iomem *timer0_va_base;
 448 void __iomem *timer1_va_base;
 449 void __iomem *timer2_va_base;
 450 void __iomem *timer3_va_base;
 451
 452 /*
 453  * How long is the timer interval?
 454  */
 455 #define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_10)
 456 #if TIMER_INTERVAL >= 0x100000
 457 #define TIMER_RELOAD    (TIMER_INTERVAL >> 8)
 458 #define TIMER_DIVISOR   (TIMER_CTRL_DIV256)
 459 #define TICKS2USECS(x)  (256 * (x) / TICKS_PER_uSEC)
 460 #elif TIMER_INTERVAL >= 0x10000
 461 #define TIMER_RELOAD    (TIMER_INTERVAL >> 4)           /* Divide by 16 */
 462 #define TIMER_DIVISOR   (TIMER_CTRL_DIV16)
 463 #define TICKS2USECS(x)  (16 * (x) / TICKS_PER_uSEC)
 464 #else
 465 #define TIMER_RELOAD    (TIMER_INTERVAL)
 466 #define TIMER_DIVISOR   (TIMER_CTRL_DIV1)
 467 #define TICKS2USECS(x)  ((x) / TICKS_PER_uSEC)
 468 #endif
 469
 470 static void timer_set_mode(enum clock_event_mode mode,
 471                            struct clock_event_device *clk)
 472 {
 473         unsigned long ctrl;
 474
 475         switch(mode) {
 476         case CLOCK_EVT_MODE_PERIODIC:
 477                 writel(TIMER_RELOAD, timer0_va_base + TIMER_LOAD);
 478
 479                 ctrl = TIMER_CTRL_PERIODIC;
 480                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
 481                 break;
 482         case CLOCK_EVT_MODE_ONESHOT:
 483                 /* period set, and timer enabled in 'next_event' hook */
 484                 ctrl = TIMER_CTRL_ONESHOT;
 485                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
 486                 break;
 487         case CLOCK_EVT_MODE_UNUSED:
 488         case CLOCK_EVT_MODE_SHUTDOWN:
 489         default:
 490                 ctrl = 0;
 491         }
 492
 493         writel(ctrl, timer0_va_base + TIMER_CTRL);
 494 }
 495
 496 static int timer_set_next_event(unsigned long evt,
 497                                 struct clock_event_device *unused)
 498 {
 499         unsigned long ctrl = readl(timer0_va_base + TIMER_CTRL);
 500
 501         writel(evt, timer0_va_base + TIMER_LOAD);
 502         writel(ctrl | TIMER_CTRL_ENABLE, timer0_va_base + TIMER_CTRL);
 503
 504         return 0;
 505 }
 506
 507 static struct clock_event_device timer0_clockevent =     {
 508         .name           = "timer0",
 509         .shift          = 32,
 510         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
 511         .set_mode       = timer_set_mode,
 512         .set_next_event = timer_set_next_event,
 513         .rating         = 300,
 514         .cpumask        = CPU_MASK_ALL,
 515 };
 516
 517 static void __init realview_clockevents_init(unsigned int timer_irq)
 518 {
 519         timer0_clockevent.irq = timer_irq;
 520         timer0_clockevent.mult =
 521                 div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
 522         timer0_clockevent.max_delta_ns =
 523                 clockevent_delta2ns(0xffffffff, &timer0_clockevent);
 524         timer0_clockevent.min_delta_ns =
 525                 clockevent_delta2ns(0xf, &timer0_clockevent);
 526
 527         clockevents_register_device(&timer0_clockevent);
 528 }
 529
 530 /*
 531  * IRQ handler for the timer
 532  */
 533 static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
 534 {
 535         struct clock_event_device *evt = &timer0_clockevent;
 536
 537         /* clear the interrupt */
 538         writel(1, timer0_va_base + TIMER_INTCLR);
 539
 540         evt->event_handler(evt);
 541
 542         return IRQ_HANDLED;
 543 }
 544
 545 static struct irqaction realview_timer_irq = {
 546         .name           = "RealView Timer Tick",
 547         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 548         .handler        = realview_timer_interrupt,
 549 };
 550
 551 static cycle_t realview_get_cycles(void)
 552 {
 553         return ~readl(timer3_va_base + TIMER_VALUE);
 554 }
 555
 556 static struct clocksource clocksource_realview = {
 557         .name   = "timer3",
 558         .rating = 200,
 559         .read   = realview_get_cycles,
 560         .mask   = CLOCKSOURCE_MASK(32),
 561         .shift  = 20,
 562         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 563 };
 564
 565 static void __init realview_clocksource_init(void)
 566 {
 567         /* setup timer 0 as free-running clocksource */
 568         writel(0, timer3_va_base + TIMER_CTRL);
 569         writel(0xffffffff, timer3_va_base + TIMER_LOAD);
 570         writel(0xffffffff, timer3_va_base + TIMER_VALUE);
 571         writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
 572                 timer3_va_base + TIMER_CTRL);
 573
 574         clocksource_realview.mult =
 575                 clocksource_khz2mult(1000, clocksource_realview.shift);
 576         clocksource_register(&clocksource_realview);
 577 }
 578
 579 /*
 580  * Set up the clock source and clock events devices
 581  */
 582 void __init realview_timer_init(unsigned int timer_irq)
 583 {
 584         u32 val;
 585
 586 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 587         /*
 588          * The dummy clock device has to be registered before the main device
 589          * so that the latter will broadcast the clock events
 590          */
 591         local_timer_setup(smp_processor_id());
 592 #endif
 593
 594         /*
 595          * set clock frequency:
 596          *      REALVIEW_REFCLK is 32KHz
 597          *      REALVIEW_TIMCLK is 1MHz
 598          */
 599         val = readl(__io_address(REALVIEW_SCTL_BASE));
 600         writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
 601                (REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) |
 602                (REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
 603                (REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
 604                __io_address(REALVIEW_SCTL_BASE));
 605
 606         /*
 607          * Initialise to a known state (all timers off)
 608          */
 609         writel(0, timer0_va_base + TIMER_CTRL);
 610         writel(0, timer1_va_base + TIMER_CTRL);
 611         writel(0, timer2_va_base + TIMER_CTRL);
 612         writel(0, timer3_va_base + TIMER_CTRL);
 613
 614         /*
 615          * Make irqs happen for the system timer
 616          */
 617         setup_irq(timer_irq, &realview_timer_irq);
 618
 619         realview_clocksource_init();
 620         realview_clockevents_init(timer_irq);
 621 }