git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/clockchips.h>
  30 #include <linux/io.h>
  31 #include <linux/smsc911x.h>
  32 #include <linux/ata_platform.h>
  33
  34 #include <asm/clkdev.h>
  35 #include <asm/system.h>
  36 #include <mach/hardware.h>
  37 #include <asm/irq.h>
  38 #include <asm/leds.h>
  39 #include <asm/mach-types.h>
  40 #include <asm/hardware/arm_timer.h>
  41 #include <asm/hardware/icst307.h>
  42
  43 #include <asm/mach/arch.h>
  44 #include <asm/mach/flash.h>
  45 #include <asm/mach/irq.h>
  46 #include <asm/mach/map.h>
  47 #include <asm/mach/mmc.h>
  48
  49 #include <asm/hardware/gic.h>
  50
  51 #include "core.h"
  52 #include "clock.h"
  53
  54 #define REALVIEW_REFCOUNTER     (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
  55
  56 /* used by entry-macro.S and platsmp.c */
  57 void __iomem *gic_cpu_base_addr;
  58
  59 /*
  60  * This is the RealView sched_clock implementation.  This has
  61  * a resolution of 41.7ns, and a maximum value of about 179s.
  62  */
  63 unsigned long long sched_clock(void)
  64 {
  65         unsigned long long v;
  66
  67         v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
  68         do_div(v, 3);
  69
  70         return v;
  71 }
  72
  73
  74 #define REALVIEW_FLASHCTRL    (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
  75
  76 static int realview_flash_init(void)
  77 {
  78         u32 val;
  79
  80         val = __raw_readl(REALVIEW_FLASHCTRL);
  81         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  82         __raw_writel(val, REALVIEW_FLASHCTRL);
  83
  84         return 0;
  85 }
  86
  87 static void realview_flash_exit(void)
  88 {
  89         u32 val;
  90
  91         val = __raw_readl(REALVIEW_FLASHCTRL);
  92         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
  93         __raw_writel(val, REALVIEW_FLASHCTRL);
  94 }
  95
  96 static void realview_flash_set_vpp(int on)
  97 {
  98         u32 val;
  99
 100         val = __raw_readl(REALVIEW_FLASHCTRL);
 101         if (on)
 102                 val |= REALVIEW_FLASHPROG_FLVPPEN;
 103         else
 104                 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
 105         __raw_writel(val, REALVIEW_FLASHCTRL);
 106 }
 107
 108 static struct flash_platform_data realview_flash_data = {
 109         .map_name               = "cfi_probe",
 110         .width                  = 4,
 111         .init                   = realview_flash_init,
 112         .exit                   = realview_flash_exit,
 113         .set_vpp                = realview_flash_set_vpp,
 114 };
 115
 116 struct platform_device realview_flash_device = {
 117         .name                   = "armflash",
 118         .id                     = 0,
 119         .dev                    = {
 120                 .platform_data  = &realview_flash_data,
 121         },
 122 };
 123
 124 int realview_flash_register(struct resource *res, u32 num)
 125 {
 126         realview_flash_device.resource = res;
 127         realview_flash_device.num_resources = num;
 128         return platform_device_register(&realview_flash_device);
 129 }
 130
 131 static struct smsc911x_platform_config smsc911x_config = {
 132         .flags          = SMSC911X_USE_32BIT,
 133         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH,
 134         .irq_type       = SMSC911X_IRQ_TYPE_PUSH_PULL,
 135         .phy_interface  = PHY_INTERFACE_MODE_MII,
 136 };
 137
 138 static struct platform_device realview_eth_device = {
 139         .name           = "smsc911x",
 140         .id             = 0,
 141         .num_resources  = 2,
 142 };
 143
 144 int realview_eth_register(const char *name, struct resource *res)
 145 {
 146         if (name)
 147                 realview_eth_device.name = name;
 148         realview_eth_device.resource = res;
 149         if (strcmp(realview_eth_device.name, "smsc911x") == 0)
 150                 realview_eth_device.dev.platform_data = &smsc911x_config;
 151
 152         return platform_device_register(&realview_eth_device);
 153 }
 154
 155 struct platform_device realview_usb_device = {
 156         .name                   = "isp1760",
 157         .num_resources          = 2,
 158 };
 159
 160 int realview_usb_register(struct resource *res)
 161 {
 162         realview_usb_device.resource = res;
 163         return platform_device_register(&realview_usb_device);
 164 }
 165
 166 static struct pata_platform_info pata_platform_data = {
 167         .ioport_shift           = 1,
 168 };
 169
 170 static struct resource pata_resources[] = {
 171         [0] = {
 172                 .start          = REALVIEW_CF_BASE,
 173                 .end            = REALVIEW_CF_BASE + 0xff,
 174                 .flags          = IORESOURCE_MEM,
 175         },
 176         [1] = {
 177                 .start          = REALVIEW_CF_BASE + 0x100,
 178                 .end            = REALVIEW_CF_BASE + SZ_4K - 1,
 179                 .flags          = IORESOURCE_MEM,
 180         },
 181 };
 182
 183 struct platform_device realview_cf_device = {
 184         .name                   = "pata_platform",
 185         .id                     = -1,
 186         .num_resources          = ARRAY_SIZE(pata_resources),
 187         .resource               = pata_resources,
 188         .dev                    = {
 189                 .platform_data  = &pata_platform_data,
 190         },
 191 };
 192
 193 static struct resource realview_i2c_resource = {
 194         .start          = REALVIEW_I2C_BASE,
 195         .end            = REALVIEW_I2C_BASE + SZ_4K - 1,
 196         .flags          = IORESOURCE_MEM,
 197 };
 198
 199 struct platform_device realview_i2c_device = {
 200         .name           = "versatile-i2c",
 201         .id             = 0,
 202         .num_resources  = 1,
 203         .resource       = &realview_i2c_resource,
 204 };
 205
 206 static struct i2c_board_info realview_i2c_board_info[] = {
 207         {
 208                 I2C_BOARD_INFO("rtc-ds1307", 0xd0 >> 1),
 209                 .type = "ds1338",
 210         },
 211 };
 212
 213 static int __init realview_i2c_init(void)
 214 {
 215         return i2c_register_board_info(0, realview_i2c_board_info,
 216                                        ARRAY_SIZE(realview_i2c_board_info));
 217 }
 218 arch_initcall(realview_i2c_init);
 219
 220 #define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
 221
 222 static unsigned int realview_mmc_status(struct device *dev)
 223 {
 224         struct amba_device *adev = container_of(dev, struct amba_device, dev);
 225         u32 mask;
 226
 227         if (adev->res.start == REALVIEW_MMCI0_BASE)
 228                 mask = 1;
 229         else
 230                 mask = 2;
 231
 232         return readl(REALVIEW_SYSMCI) & mask;
 233 }
 234
 235 struct mmc_platform_data realview_mmc0_plat_data = {
 236         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 237         .status         = realview_mmc_status,
 238 };
 239
 240 struct mmc_platform_data realview_mmc1_plat_data = {
 241         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 242         .status         = realview_mmc_status,
 243 };
 244
 245 /*
 246  * Clock handling
 247  */
 248 static const struct icst307_params realview_oscvco_params = {
 249         .ref            = 24000,
 250         .vco_max        = 200000,
 251         .vd_min         = 4 + 8,
 252         .vd_max         = 511 + 8,
 253         .rd_min         = 1 + 2,
 254         .rd_max         = 127 + 2,
 255 };
 256
 257 static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
 258 {
 259         void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
 260         void __iomem *sys_osc;
 261         u32 val;
 262
 263         if (machine_is_realview_pb1176())
 264                 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC0_OFFSET;
 265         else
 266                 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
 267
 268         val = readl(sys_osc) & ~0x7ffff;
 269         val |= vco.v | (vco.r << 9) | (vco.s << 16);
 270
 271         writel(0xa05f, sys_lock);
 272         writel(val, sys_osc);
 273         writel(0, sys_lock);
 274 }
 275
 276 static struct clk oscvco_clk = {
 277         .params = &realview_oscvco_params,
 278         .setvco = realview_oscvco_set,
 279 };
 280
 281 /*
 282  * These are fixed clocks.
 283  */
 284 static struct clk ref24_clk = {
 285         .rate   = 24000000,
 286 };
 287
 288 static struct clk_lookup lookups[] = {
 289         {       /* UART0 */
 290                 .dev_id         = "dev:f1",
 291                 .clk            = &ref24_clk,
 292         }, {    /* UART1 */
 293                 .dev_id         = "dev:f2",
 294                 .clk            = &ref24_clk,
 295         }, {    /* UART2 */
 296                 .dev_id         = "dev:f3",
 297                 .clk            = &ref24_clk,
 298         }, {    /* UART3 */
 299                 .dev_id         = "fpga:09",
 300                 .clk            = &ref24_clk,
 301         }, {    /* KMI0 */
 302                 .dev_id         = "fpga:06",
 303                 .clk            = &ref24_clk,
 304         }, {    /* KMI1 */
 305                 .dev_id         = "fpga:07",
 306                 .clk            = &ref24_clk,
 307         }, {    /* MMC0 */
 308                 .dev_id         = "fpga:05",
 309                 .clk            = &ref24_clk,
 310         }, {    /* EB:CLCD */
 311                 .dev_id         = "dev:20",
 312                 .clk            = &oscvco_clk,
 313         }, {    /* PB:CLCD */
 314                 .dev_id         = "issp:20",
 315                 .clk            = &oscvco_clk,
 316         }
 317 };
 318
 319 static int __init clk_init(void)
 320 {
 321         int i;
 322
 323         for (i = 0; i < ARRAY_SIZE(lookups); i++)
 324                 clkdev_add(&lookups[i]);
 325         return 0;
 326 }
 327 arch_initcall(clk_init);
 328
 329 /*
 330  * CLCD support.
 331  */
 332 #define SYS_CLCD_NLCDIOON       (1 << 2)
 333 #define SYS_CLCD_VDDPOSSWITCH   (1 << 3)
 334 #define SYS_CLCD_PWR3V5SWITCH   (1 << 4)
 335 #define SYS_CLCD_ID_MASK        (0x1f << 8)
 336 #define SYS_CLCD_ID_SANYO_3_8   (0x00 << 8)
 337 #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
 338 #define SYS_CLCD_ID_EPSON_2_2   (0x02 << 8)
 339 #define SYS_CLCD_ID_SANYO_2_5   (0x07 << 8)
 340 #define SYS_CLCD_ID_VGA         (0x1f << 8)
 341
 342 static struct clcd_panel vga = {
 343         .mode           = {
 344                 .name           = "VGA",
 345                 .refresh        = 60,
 346                 .xres           = 640,
 347                 .yres           = 480,
 348                 .pixclock       = 39721,
 349                 .left_margin    = 40,
 350                 .right_margin   = 24,
 351                 .upper_margin   = 32,
 352                 .lower_margin   = 11,
 353                 .hsync_len      = 96,
 354                 .vsync_len      = 2,
 355                 .sync           = 0,
 356                 .vmode          = FB_VMODE_NONINTERLACED,
 357         },
 358         .width          = -1,
 359         .height         = -1,
 360         .tim2           = TIM2_BCD | TIM2_IPC,
 361         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 362         .bpp            = 16,
 363 };
 364
 365 static struct clcd_panel xvga = {
 366         .mode           = {
 367                 .name           = "XVGA",
 368                 .refresh        = 60,
 369                 .xres           = 1024,
 370                 .yres           = 768,
 371                 .pixclock       = 15748,
 372                 .left_margin    = 152,
 373                 .right_margin   = 48,
 374                 .upper_margin   = 23,
 375                 .lower_margin   = 3,
 376                 .hsync_len      = 104,
 377                 .vsync_len      = 4,
 378                 .sync           = 0,
 379                 .vmode          = FB_VMODE_NONINTERLACED,
 380         },
 381         .width          = -1,
 382         .height         = -1,
 383         .tim2           = TIM2_BCD | TIM2_IPC,
 384         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 385         .bpp            = 16,
 386 };
 387
 388 static struct clcd_panel sanyo_3_8_in = {
 389         .mode           = {
 390                 .name           = "Sanyo QVGA",
 391                 .refresh        = 116,
 392                 .xres           = 320,
 393                 .yres           = 240,
 394                 .pixclock       = 100000,
 395                 .left_margin    = 6,
 396                 .right_margin   = 6,
 397                 .upper_margin   = 5,
 398                 .lower_margin   = 5,
 399                 .hsync_len      = 6,
 400                 .vsync_len      = 6,
 401                 .sync           = 0,
 402                 .vmode          = FB_VMODE_NONINTERLACED,
 403         },
 404         .width          = -1,
 405         .height         = -1,
 406         .tim2           = TIM2_BCD,
 407         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 408         .bpp            = 16,
 409 };
 410
 411 static struct clcd_panel sanyo_2_5_in = {
 412         .mode           = {
 413                 .name           = "Sanyo QVGA Portrait",
 414                 .refresh        = 116,
 415                 .xres           = 240,
 416                 .yres           = 320,
 417                 .pixclock       = 100000,
 418                 .left_margin    = 20,
 419                 .right_margin   = 10,
 420                 .upper_margin   = 2,
 421                 .lower_margin   = 2,
 422                 .hsync_len      = 10,
 423                 .vsync_len      = 2,
 424                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 425                 .vmode          = FB_VMODE_NONINTERLACED,
 426         },
 427         .width          = -1,
 428         .height         = -1,
 429         .tim2           = TIM2_IVS | TIM2_IHS | TIM2_IPC,
 430         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 431         .bpp            = 16,
 432 };
 433
 434 static struct clcd_panel epson_2_2_in = {
 435         .mode           = {
 436                 .name           = "Epson QCIF",
 437                 .refresh        = 390,
 438                 .xres           = 176,
 439                 .yres           = 220,
 440                 .pixclock       = 62500,
 441                 .left_margin    = 3,
 442                 .right_margin   = 2,
 443                 .upper_margin   = 1,
 444                 .lower_margin   = 0,
 445                 .hsync_len      = 3,
 446                 .vsync_len      = 2,
 447                 .sync           = 0,
 448                 .vmode          = FB_VMODE_NONINTERLACED,
 449         },
 450         .width          = -1,
 451         .height         = -1,
 452         .tim2           = TIM2_BCD | TIM2_IPC,
 453         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 454         .bpp            = 16,
 455 };
 456
 457 /*
 458  * Detect which LCD panel is connected, and return the appropriate
 459  * clcd_panel structure.  Note: we do not have any information on
 460  * the required timings for the 8.4in panel, so we presently assume
 461  * VGA timings.
 462  */
 463 static struct clcd_panel *realview_clcd_panel(void)
 464 {
 465         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 466         struct clcd_panel *vga_panel;
 467         struct clcd_panel *panel;
 468         u32 val;
 469
 470         if (machine_is_realview_eb())
 471                 vga_panel = &vga;
 472         else
 473                 vga_panel = &xvga;
 474
 475         val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
 476         if (val == SYS_CLCD_ID_SANYO_3_8)
 477                 panel = &sanyo_3_8_in;
 478         else if (val == SYS_CLCD_ID_SANYO_2_5)
 479                 panel = &sanyo_2_5_in;
 480         else if (val == SYS_CLCD_ID_EPSON_2_2)
 481                 panel = &epson_2_2_in;
 482         else if (val == SYS_CLCD_ID_VGA)
 483                 panel = vga_panel;
 484         else {
 485                 printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
 486                         val);
 487                 panel = vga_panel;
 488         }
 489
 490         return panel;
 491 }
 492
 493 /*
 494  * Disable all display connectors on the interface module.
 495  */
 496 static void realview_clcd_disable(struct clcd_fb *fb)
 497 {
 498         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 499         u32 val;
 500
 501         val = readl(sys_clcd);
 502         val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 503         writel(val, sys_clcd);
 504 }
 505
 506 /*
 507  * Enable the relevant connector on the interface module.
 508  */
 509 static void realview_clcd_enable(struct clcd_fb *fb)
 510 {
 511         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 512         u32 val;
 513
 514         /*
 515          * Enable the PSUs
 516          */
 517         val = readl(sys_clcd);
 518         val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 519         writel(val, sys_clcd);
 520 }
 521
 522 static int realview_clcd_setup(struct clcd_fb *fb)
 523 {
 524         unsigned long framesize;
 525         dma_addr_t dma;
 526
 527         if (machine_is_realview_eb())
 528                 /* VGA, 16bpp */
 529                 framesize = 640 * 480 * 2;
 530         else
 531                 /* XVGA, 16bpp */
 532                 framesize = 1024 * 768 * 2;
 533
 534         fb->panel               = realview_clcd_panel();
 535
 536         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
 537                                                     &dma, GFP_KERNEL);
 538         if (!fb->fb.screen_base) {
 539                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 540                 return -ENOMEM;
 541         }
 542
 543         fb->fb.fix.smem_start   = dma;
 544         fb->fb.fix.smem_len     = framesize;
 545
 546         return 0;
 547 }
 548
 549 static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 550 {
 551         return dma_mmap_writecombine(&fb->dev->dev, vma,
 552                                      fb->fb.screen_base,
 553                                      fb->fb.fix.smem_start,
 554                                      fb->fb.fix.smem_len);
 555 }
 556
 557 static void realview_clcd_remove(struct clcd_fb *fb)
 558 {
 559         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 560                               fb->fb.screen_base, fb->fb.fix.smem_start);
 561 }
 562
 563 struct clcd_board clcd_plat_data = {
 564         .name           = "RealView",
 565         .check          = clcdfb_check,
 566         .decode         = clcdfb_decode,
 567         .disable        = realview_clcd_disable,
 568         .enable         = realview_clcd_enable,
 569         .setup          = realview_clcd_setup,
 570         .mmap           = realview_clcd_mmap,
 571         .remove         = realview_clcd_remove,
 572 };
 573
 574 #ifdef CONFIG_LEDS
 575 #define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
 576
 577 void realview_leds_event(led_event_t ledevt)
 578 {
 579         unsigned long flags;
 580         u32 val;
 581
 582         local_irq_save(flags);
 583         val = readl(VA_LEDS_BASE);
 584
 585         switch (ledevt) {
 586         case led_idle_start:
 587                 val = val & ~REALVIEW_SYS_LED0;
 588                 break;
 589
 590         case led_idle_end:
 591                 val = val | REALVIEW_SYS_LED0;
 592                 break;
 593
 594         case led_timer:
 595                 val = val ^ REALVIEW_SYS_LED1;
 596                 break;
 597
 598         case led_halted:
 599                 val = 0;
 600                 break;
 601
 602         default:
 603                 break;
 604         }
 605
 606         writel(val, VA_LEDS_BASE);
 607         local_irq_restore(flags);
 608 }
 609 #endif  /* CONFIG_LEDS */
 610
 611 /*
 612  * Where is the timer (VA)?
 613  */
 614 void __iomem *timer0_va_base;
 615 void __iomem *timer1_va_base;
 616 void __iomem *timer2_va_base;
 617 void __iomem *timer3_va_base;
 618
 619 /*
 620  * How long is the timer interval?
 621  */
 622 #define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_10)
 623 #if TIMER_INTERVAL >= 0x100000
 624 #define TIMER_RELOAD    (TIMER_INTERVAL >> 8)
 625 #define TIMER_DIVISOR   (TIMER_CTRL_DIV256)
 626 #define TICKS2USECS(x)  (256 * (x) / TICKS_PER_uSEC)
 627 #elif TIMER_INTERVAL >= 0x10000
 628 #define TIMER_RELOAD    (TIMER_INTERVAL >> 4)           /* Divide by 16 */
 629 #define TIMER_DIVISOR   (TIMER_CTRL_DIV16)
 630 #define TICKS2USECS(x)  (16 * (x) / TICKS_PER_uSEC)
 631 #else
 632 #define TIMER_RELOAD    (TIMER_INTERVAL)
 633 #define TIMER_DIVISOR   (TIMER_CTRL_DIV1)
 634 #define TICKS2USECS(x)  ((x) / TICKS_PER_uSEC)
 635 #endif
 636
 637 static void timer_set_mode(enum clock_event_mode mode,
 638                            struct clock_event_device *clk)
 639 {
 640         unsigned long ctrl;
 641
 642         switch(mode) {
 643         case CLOCK_EVT_MODE_PERIODIC:
 644                 writel(TIMER_RELOAD, timer0_va_base + TIMER_LOAD);
 645
 646                 ctrl = TIMER_CTRL_PERIODIC;
 647                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
 648                 break;
 649         case CLOCK_EVT_MODE_ONESHOT:
 650                 /* period set, and timer enabled in 'next_event' hook */
 651                 ctrl = TIMER_CTRL_ONESHOT;
 652                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
 653                 break;
 654         case CLOCK_EVT_MODE_UNUSED:
 655         case CLOCK_EVT_MODE_SHUTDOWN:
 656         default:
 657                 ctrl = 0;
 658         }
 659
 660         writel(ctrl, timer0_va_base + TIMER_CTRL);
 661 }
 662
 663 static int timer_set_next_event(unsigned long evt,
 664                                 struct clock_event_device *unused)
 665 {
 666         unsigned long ctrl = readl(timer0_va_base + TIMER_CTRL);
 667
 668         writel(evt, timer0_va_base + TIMER_LOAD);
 669         writel(ctrl | TIMER_CTRL_ENABLE, timer0_va_base + TIMER_CTRL);
 670
 671         return 0;
 672 }
 673
 674 static struct clock_event_device timer0_clockevent =     {
 675         .name           = "timer0",
 676         .shift          = 32,
 677         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
 678         .set_mode       = timer_set_mode,
 679         .set_next_event = timer_set_next_event,
 680         .rating         = 300,
 681         .cpumask        = cpu_all_mask,
 682 };
 683
 684 static void __init realview_clockevents_init(unsigned int timer_irq)
 685 {
 686         timer0_clockevent.irq = timer_irq;
 687         timer0_clockevent.mult =
 688                 div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
 689         timer0_clockevent.max_delta_ns =
 690                 clockevent_delta2ns(0xffffffff, &timer0_clockevent);
 691         timer0_clockevent.min_delta_ns =
 692                 clockevent_delta2ns(0xf, &timer0_clockevent);
 693
 694         clockevents_register_device(&timer0_clockevent);
 695 }
 696
 697 /*
 698  * IRQ handler for the timer
 699  */
 700 static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
 701 {
 702         struct clock_event_device *evt = &timer0_clockevent;
 703
 704         /* clear the interrupt */
 705         writel(1, timer0_va_base + TIMER_INTCLR);
 706
 707         evt->event_handler(evt);
 708
 709         return IRQ_HANDLED;
 710 }
 711
 712 static struct irqaction realview_timer_irq = {
 713         .name           = "RealView Timer Tick",
 714         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 715         .handler        = realview_timer_interrupt,
 716 };
 717
 718 static cycle_t realview_get_cycles(struct clocksource *cs)
 719 {
 720         return ~readl(timer3_va_base + TIMER_VALUE);
 721 }
 722
 723 static struct clocksource clocksource_realview = {
 724         .name   = "timer3",
 725         .rating = 200,
 726         .read   = realview_get_cycles,
 727         .mask   = CLOCKSOURCE_MASK(32),
 728         .shift  = 20,
 729         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 730 };
 731
 732 static void __init realview_clocksource_init(void)
 733 {
 734         /* setup timer 0 as free-running clocksource */
 735         writel(0, timer3_va_base + TIMER_CTRL);
 736         writel(0xffffffff, timer3_va_base + TIMER_LOAD);
 737         writel(0xffffffff, timer3_va_base + TIMER_VALUE);
 738         writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
 739                 timer3_va_base + TIMER_CTRL);
 740
 741         clocksource_realview.mult =
 742                 clocksource_khz2mult(1000, clocksource_realview.shift);
 743         clocksource_register(&clocksource_realview);
 744 }
 745
 746 /*
 747  * Set up the clock source and clock events devices
 748  */
 749 void __init realview_timer_init(unsigned int timer_irq)
 750 {
 751         u32 val;
 752
 753         /*
 754          * set clock frequency:
 755          *      REALVIEW_REFCLK is 32KHz
 756          *      REALVIEW_TIMCLK is 1MHz
 757          */
 758         val = readl(__io_address(REALVIEW_SCTL_BASE));
 759         writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
 760                (REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) |
 761                (REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
 762                (REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
 763                __io_address(REALVIEW_SCTL_BASE));
 764
 765         /*
 766          * Initialise to a known state (all timers off)
 767          */
 768         writel(0, timer0_va_base + TIMER_CTRL);
 769         writel(0, timer1_va_base + TIMER_CTRL);
 770         writel(0, timer2_va_base + TIMER_CTRL);
 771         writel(0, timer3_va_base + TIMER_CTRL);
 772
 773         /*
 774          * Make irqs happen for the system timer
 775          */
 776         setup_irq(timer_irq, &realview_timer_irq);
 777
 778         realview_clocksource_init();
 779         realview_clockevents_init(timer_irq);
 780 }