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 #include <linux/amba/mmci.h>
  34 #include <linux/gfp.h>
  35
  36 #include <asm/clkdev.h>
  37 #include <asm/system.h>
  38 #include <mach/hardware.h>
  39 #include <asm/irq.h>
  40 #include <asm/leds.h>
  41 #include <asm/mach-types.h>
  42 #include <asm/hardware/arm_timer.h>
  43 #include <asm/hardware/icst307.h>
  44
  45 #include <asm/mach/arch.h>
  46 #include <asm/mach/flash.h>
  47 #include <asm/mach/irq.h>
  48 #include <asm/mach/map.h>
  49
  50 #include <asm/hardware/gic.h>
  51
  52 #include <mach/platform.h>
  53 #include <mach/irqs.h>
  54
  55 #include "core.h"
  56 #include "clock.h"
  57
  58 #define REALVIEW_REFCOUNTER     (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
  59
  60 /* used by entry-macro.S and platsmp.c */
  61 void __iomem *gic_cpu_base_addr;
  62
  63 #ifdef CONFIG_ZONE_DMA
  64 /*
  65  * Adjust the zones if there are restrictions for DMA access.
  66  */
  67 void __init realview_adjust_zones(int node, unsigned long *size,
  68                                   unsigned long *hole)
  69 {
  70         unsigned long dma_size = SZ_256M >> PAGE_SHIFT;
  71
  72         if (!machine_is_realview_pbx() || node || (size[0] <= dma_size))
  73                 return;
  74
  75         size[ZONE_NORMAL] = size[0] - dma_size;
  76         size[ZONE_DMA] = dma_size;
  77         hole[ZONE_NORMAL] = hole[0];
  78         hole[ZONE_DMA] = 0;
  79 }
  80 #endif
  81
  82 /*
  83  * This is the RealView sched_clock implementation.  This has
  84  * a resolution of 41.7ns, and a maximum value of about 179s.
  85  */
  86 unsigned long long sched_clock(void)
  87 {
  88         unsigned long long v;
  89
  90         v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
  91         do_div(v, 3);
  92
  93         return v;
  94 }
  95
  96
  97 #define REALVIEW_FLASHCTRL    (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
  98
  99 static int realview_flash_init(void)
 100 {
 101         u32 val;
 102
 103         val = __raw_readl(REALVIEW_FLASHCTRL);
 104         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
 105         __raw_writel(val, REALVIEW_FLASHCTRL);
 106
 107         return 0;
 108 }
 109
 110 static void realview_flash_exit(void)
 111 {
 112         u32 val;
 113
 114         val = __raw_readl(REALVIEW_FLASHCTRL);
 115         val &= ~REALVIEW_FLASHPROG_FLVPPEN;
 116         __raw_writel(val, REALVIEW_FLASHCTRL);
 117 }
 118
 119 static void realview_flash_set_vpp(int on)
 120 {
 121         u32 val;
 122
 123         val = __raw_readl(REALVIEW_FLASHCTRL);
 124         if (on)
 125                 val |= REALVIEW_FLASHPROG_FLVPPEN;
 126         else
 127                 val &= ~REALVIEW_FLASHPROG_FLVPPEN;
 128         __raw_writel(val, REALVIEW_FLASHCTRL);
 129 }
 130
 131 static struct flash_platform_data realview_flash_data = {
 132         .map_name               = "cfi_probe",
 133         .width                  = 4,
 134         .init                   = realview_flash_init,
 135         .exit                   = realview_flash_exit,
 136         .set_vpp                = realview_flash_set_vpp,
 137 };
 138
 139 struct platform_device realview_flash_device = {
 140         .name                   = "armflash",
 141         .id                     = 0,
 142         .dev                    = {
 143                 .platform_data  = &realview_flash_data,
 144         },
 145 };
 146
 147 int realview_flash_register(struct resource *res, u32 num)
 148 {
 149         realview_flash_device.resource = res;
 150         realview_flash_device.num_resources = num;
 151         return platform_device_register(&realview_flash_device);
 152 }
 153
 154 static struct smsc911x_platform_config smsc911x_config = {
 155         .flags          = SMSC911X_USE_32BIT,
 156         .irq_polarity   = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH,
 157         .irq_type       = SMSC911X_IRQ_TYPE_PUSH_PULL,
 158         .phy_interface  = PHY_INTERFACE_MODE_MII,
 159 };
 160
 161 static struct platform_device realview_eth_device = {
 162         .name           = "smsc911x",
 163         .id             = 0,
 164         .num_resources  = 2,
 165 };
 166
 167 int realview_eth_register(const char *name, struct resource *res)
 168 {
 169         if (name)
 170                 realview_eth_device.name = name;
 171         realview_eth_device.resource = res;
 172         if (strcmp(realview_eth_device.name, "smsc911x") == 0)
 173                 realview_eth_device.dev.platform_data = &smsc911x_config;
 174
 175         return platform_device_register(&realview_eth_device);
 176 }
 177
 178 struct platform_device realview_usb_device = {
 179         .name                   = "isp1760",
 180         .num_resources          = 2,
 181 };
 182
 183 int realview_usb_register(struct resource *res)
 184 {
 185         realview_usb_device.resource = res;
 186         return platform_device_register(&realview_usb_device);
 187 }
 188
 189 static struct pata_platform_info pata_platform_data = {
 190         .ioport_shift           = 1,
 191 };
 192
 193 static struct resource pata_resources[] = {
 194         [0] = {
 195                 .start          = REALVIEW_CF_BASE,
 196                 .end            = REALVIEW_CF_BASE + 0xff,
 197                 .flags          = IORESOURCE_MEM,
 198         },
 199         [1] = {
 200                 .start          = REALVIEW_CF_BASE + 0x100,
 201                 .end            = REALVIEW_CF_BASE + SZ_4K - 1,
 202                 .flags          = IORESOURCE_MEM,
 203         },
 204 };
 205
 206 struct platform_device realview_cf_device = {
 207         .name                   = "pata_platform",
 208         .id                     = -1,
 209         .num_resources          = ARRAY_SIZE(pata_resources),
 210         .resource               = pata_resources,
 211         .dev                    = {
 212                 .platform_data  = &pata_platform_data,
 213         },
 214 };
 215
 216 static struct resource realview_i2c_resource = {
 217         .start          = REALVIEW_I2C_BASE,
 218         .end            = REALVIEW_I2C_BASE + SZ_4K - 1,
 219         .flags          = IORESOURCE_MEM,
 220 };
 221
 222 struct platform_device realview_i2c_device = {
 223         .name           = "versatile-i2c",
 224         .id             = 0,
 225         .num_resources  = 1,
 226         .resource       = &realview_i2c_resource,
 227 };
 228
 229 static struct i2c_board_info realview_i2c_board_info[] = {
 230         {
 231                 I2C_BOARD_INFO("ds1338", 0xd0 >> 1),
 232         },
 233 };
 234
 235 static int __init realview_i2c_init(void)
 236 {
 237         return i2c_register_board_info(0, realview_i2c_board_info,
 238                                        ARRAY_SIZE(realview_i2c_board_info));
 239 }
 240 arch_initcall(realview_i2c_init);
 241
 242 #define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
 243
 244 /*
 245  * This is only used if GPIOLIB support is disabled
 246  */
 247 static unsigned int realview_mmc_status(struct device *dev)
 248 {
 249         struct amba_device *adev = container_of(dev, struct amba_device, dev);
 250         u32 mask;
 251
 252         if (adev->res.start == REALVIEW_MMCI0_BASE)
 253                 mask = 1;
 254         else
 255                 mask = 2;
 256
 257         return readl(REALVIEW_SYSMCI) & mask;
 258 }
 259
 260 struct mmci_platform_data realview_mmc0_plat_data = {
 261         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 262         .status         = realview_mmc_status,
 263         .gpio_wp        = 17,
 264         .gpio_cd        = 16,
 265 };
 266
 267 struct mmci_platform_data realview_mmc1_plat_data = {
 268         .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
 269         .status         = realview_mmc_status,
 270         .gpio_wp        = 19,
 271         .gpio_cd        = 18,
 272 };
 273
 274 /*
 275  * Clock handling
 276  */
 277 static const struct icst307_params realview_oscvco_params = {
 278         .ref            = 24000,
 279         .vco_max        = 200000,
 280         .vd_min         = 4 + 8,
 281         .vd_max         = 511 + 8,
 282         .rd_min         = 1 + 2,
 283         .rd_max         = 127 + 2,
 284 };
 285
 286 static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
 287 {
 288         void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
 289         void __iomem *sys_osc;
 290         u32 val;
 291
 292         if (machine_is_realview_pb1176())
 293                 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC0_OFFSET;
 294         else
 295                 sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
 296
 297         val = readl(sys_osc) & ~0x7ffff;
 298         val |= vco.v | (vco.r << 9) | (vco.s << 16);
 299
 300         writel(0xa05f, sys_lock);
 301         writel(val, sys_osc);
 302         writel(0, sys_lock);
 303 }
 304
 305 static struct clk oscvco_clk = {
 306         .params = &realview_oscvco_params,
 307         .setvco = realview_oscvco_set,
 308 };
 309
 310 /*
 311  * These are fixed clocks.
 312  */
 313 static struct clk ref24_clk = {
 314         .rate   = 24000000,
 315 };
 316
 317 static struct clk_lookup lookups[] = {
 318         {       /* UART0 */
 319                 .dev_id         = "dev:uart0",
 320                 .clk            = &ref24_clk,
 321         }, {    /* UART1 */
 322                 .dev_id         = "dev:uart1",
 323                 .clk            = &ref24_clk,
 324         }, {    /* UART2 */
 325                 .dev_id         = "dev:uart2",
 326                 .clk            = &ref24_clk,
 327         }, {    /* UART3 */
 328                 .dev_id         = "fpga:uart3",
 329                 .clk            = &ref24_clk,
 330         }, {    /* KMI0 */
 331                 .dev_id         = "fpga:kmi0",
 332                 .clk            = &ref24_clk,
 333         }, {    /* KMI1 */
 334                 .dev_id         = "fpga:kmi1",
 335                 .clk            = &ref24_clk,
 336         }, {    /* MMC0 */
 337                 .dev_id         = "fpga:mmc0",
 338                 .clk            = &ref24_clk,
 339         }, {    /* EB:CLCD */
 340                 .dev_id         = "dev:clcd",
 341                 .clk            = &oscvco_clk,
 342         }, {    /* PB:CLCD */
 343                 .dev_id         = "issp:clcd",
 344                 .clk            = &oscvco_clk,
 345         }
 346 };
 347
 348 static int __init clk_init(void)
 349 {
 350         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 351         return 0;
 352 }
 353 arch_initcall(clk_init);
 354
 355 /*
 356  * CLCD support.
 357  */
 358 #define SYS_CLCD_NLCDIOON       (1 << 2)
 359 #define SYS_CLCD_VDDPOSSWITCH   (1 << 3)
 360 #define SYS_CLCD_PWR3V5SWITCH   (1 << 4)
 361 #define SYS_CLCD_ID_MASK        (0x1f << 8)
 362 #define SYS_CLCD_ID_SANYO_3_8   (0x00 << 8)
 363 #define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
 364 #define SYS_CLCD_ID_EPSON_2_2   (0x02 << 8)
 365 #define SYS_CLCD_ID_SANYO_2_5   (0x07 << 8)
 366 #define SYS_CLCD_ID_VGA         (0x1f << 8)
 367
 368 static struct clcd_panel vga = {
 369         .mode           = {
 370                 .name           = "VGA",
 371                 .refresh        = 60,
 372                 .xres           = 640,
 373                 .yres           = 480,
 374                 .pixclock       = 39721,
 375                 .left_margin    = 40,
 376                 .right_margin   = 24,
 377                 .upper_margin   = 32,
 378                 .lower_margin   = 11,
 379                 .hsync_len      = 96,
 380                 .vsync_len      = 2,
 381                 .sync           = 0,
 382                 .vmode          = FB_VMODE_NONINTERLACED,
 383         },
 384         .width          = -1,
 385         .height         = -1,
 386         .tim2           = TIM2_BCD | TIM2_IPC,
 387         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 388         .bpp            = 16,
 389 };
 390
 391 static struct clcd_panel xvga = {
 392         .mode           = {
 393                 .name           = "XVGA",
 394                 .refresh        = 60,
 395                 .xres           = 1024,
 396                 .yres           = 768,
 397                 .pixclock       = 15748,
 398                 .left_margin    = 152,
 399                 .right_margin   = 48,
 400                 .upper_margin   = 23,
 401                 .lower_margin   = 3,
 402                 .hsync_len      = 104,
 403                 .vsync_len      = 4,
 404                 .sync           = 0,
 405                 .vmode          = FB_VMODE_NONINTERLACED,
 406         },
 407         .width          = -1,
 408         .height         = -1,
 409         .tim2           = TIM2_BCD | TIM2_IPC,
 410         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 411         .bpp            = 16,
 412 };
 413
 414 static struct clcd_panel sanyo_3_8_in = {
 415         .mode           = {
 416                 .name           = "Sanyo QVGA",
 417                 .refresh        = 116,
 418                 .xres           = 320,
 419                 .yres           = 240,
 420                 .pixclock       = 100000,
 421                 .left_margin    = 6,
 422                 .right_margin   = 6,
 423                 .upper_margin   = 5,
 424                 .lower_margin   = 5,
 425                 .hsync_len      = 6,
 426                 .vsync_len      = 6,
 427                 .sync           = 0,
 428                 .vmode          = FB_VMODE_NONINTERLACED,
 429         },
 430         .width          = -1,
 431         .height         = -1,
 432         .tim2           = TIM2_BCD,
 433         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 434         .bpp            = 16,
 435 };
 436
 437 static struct clcd_panel sanyo_2_5_in = {
 438         .mode           = {
 439                 .name           = "Sanyo QVGA Portrait",
 440                 .refresh        = 116,
 441                 .xres           = 240,
 442                 .yres           = 320,
 443                 .pixclock       = 100000,
 444                 .left_margin    = 20,
 445                 .right_margin   = 10,
 446                 .upper_margin   = 2,
 447                 .lower_margin   = 2,
 448                 .hsync_len      = 10,
 449                 .vsync_len      = 2,
 450                 .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 451                 .vmode          = FB_VMODE_NONINTERLACED,
 452         },
 453         .width          = -1,
 454         .height         = -1,
 455         .tim2           = TIM2_IVS | TIM2_IHS | TIM2_IPC,
 456         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 457         .bpp            = 16,
 458 };
 459
 460 static struct clcd_panel epson_2_2_in = {
 461         .mode           = {
 462                 .name           = "Epson QCIF",
 463                 .refresh        = 390,
 464                 .xres           = 176,
 465                 .yres           = 220,
 466                 .pixclock       = 62500,
 467                 .left_margin    = 3,
 468                 .right_margin   = 2,
 469                 .upper_margin   = 1,
 470                 .lower_margin   = 0,
 471                 .hsync_len      = 3,
 472                 .vsync_len      = 2,
 473                 .sync           = 0,
 474                 .vmode          = FB_VMODE_NONINTERLACED,
 475         },
 476         .width          = -1,
 477         .height         = -1,
 478         .tim2           = TIM2_BCD | TIM2_IPC,
 479         .cntl           = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
 480         .bpp            = 16,
 481 };
 482
 483 /*
 484  * Detect which LCD panel is connected, and return the appropriate
 485  * clcd_panel structure.  Note: we do not have any information on
 486  * the required timings for the 8.4in panel, so we presently assume
 487  * VGA timings.
 488  */
 489 static struct clcd_panel *realview_clcd_panel(void)
 490 {
 491         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 492         struct clcd_panel *vga_panel;
 493         struct clcd_panel *panel;
 494         u32 val;
 495
 496         if (machine_is_realview_eb())
 497                 vga_panel = &vga;
 498         else
 499                 vga_panel = &xvga;
 500
 501         val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
 502         if (val == SYS_CLCD_ID_SANYO_3_8)
 503                 panel = &sanyo_3_8_in;
 504         else if (val == SYS_CLCD_ID_SANYO_2_5)
 505                 panel = &sanyo_2_5_in;
 506         else if (val == SYS_CLCD_ID_EPSON_2_2)
 507                 panel = &epson_2_2_in;
 508         else if (val == SYS_CLCD_ID_VGA)
 509                 panel = vga_panel;
 510         else {
 511                 printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
 512                         val);
 513                 panel = vga_panel;
 514         }
 515
 516         return panel;
 517 }
 518
 519 /*
 520  * Disable all display connectors on the interface module.
 521  */
 522 static void realview_clcd_disable(struct clcd_fb *fb)
 523 {
 524         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 525         u32 val;
 526
 527         val = readl(sys_clcd);
 528         val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 529         writel(val, sys_clcd);
 530 }
 531
 532 /*
 533  * Enable the relevant connector on the interface module.
 534  */
 535 static void realview_clcd_enable(struct clcd_fb *fb)
 536 {
 537         void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
 538         u32 val;
 539
 540         /*
 541          * Enable the PSUs
 542          */
 543         val = readl(sys_clcd);
 544         val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
 545         writel(val, sys_clcd);
 546 }
 547
 548 static int realview_clcd_setup(struct clcd_fb *fb)
 549 {
 550         unsigned long framesize;
 551         dma_addr_t dma;
 552
 553         if (machine_is_realview_eb())
 554                 /* VGA, 16bpp */
 555                 framesize = 640 * 480 * 2;
 556         else
 557                 /* XVGA, 16bpp */
 558                 framesize = 1024 * 768 * 2;
 559
 560         fb->panel               = realview_clcd_panel();
 561
 562         fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
 563                                                     &dma, GFP_KERNEL | GFP_DMA);
 564         if (!fb->fb.screen_base) {
 565                 printk(KERN_ERR "CLCD: unable to map framebuffer\n");
 566                 return -ENOMEM;
 567         }
 568
 569         fb->fb.fix.smem_start   = dma;
 570         fb->fb.fix.smem_len     = framesize;
 571
 572         return 0;
 573 }
 574
 575 static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
 576 {
 577         return dma_mmap_writecombine(&fb->dev->dev, vma,
 578                                      fb->fb.screen_base,
 579                                      fb->fb.fix.smem_start,
 580                                      fb->fb.fix.smem_len);
 581 }
 582
 583 static void realview_clcd_remove(struct clcd_fb *fb)
 584 {
 585         dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
 586                               fb->fb.screen_base, fb->fb.fix.smem_start);
 587 }
 588
 589 struct clcd_board clcd_plat_data = {
 590         .name           = "RealView",
 591         .check          = clcdfb_check,
 592         .decode         = clcdfb_decode,
 593         .disable        = realview_clcd_disable,
 594         .enable         = realview_clcd_enable,
 595         .setup          = realview_clcd_setup,
 596         .mmap           = realview_clcd_mmap,
 597         .remove         = realview_clcd_remove,
 598 };
 599
 600 #ifdef CONFIG_LEDS
 601 #define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
 602
 603 void realview_leds_event(led_event_t ledevt)
 604 {
 605         unsigned long flags;
 606         u32 val;
 607         u32 led = 1 << smp_processor_id();
 608
 609         local_irq_save(flags);
 610         val = readl(VA_LEDS_BASE);
 611
 612         switch (ledevt) {
 613         case led_idle_start:
 614                 val = val & ~led;
 615                 break;
 616
 617         case led_idle_end:
 618                 val = val | led;
 619                 break;
 620
 621         case led_timer:
 622                 val = val ^ REALVIEW_SYS_LED7;
 623                 break;
 624
 625         case led_halted:
 626                 val = 0;
 627                 break;
 628
 629         default:
 630                 break;
 631         }
 632
 633         writel(val, VA_LEDS_BASE);
 634         local_irq_restore(flags);
 635 }
 636 #endif  /* CONFIG_LEDS */
 637
 638 /*
 639  * Where is the timer (VA)?
 640  */
 641 void __iomem *timer0_va_base;
 642 void __iomem *timer1_va_base;
 643 void __iomem *timer2_va_base;
 644 void __iomem *timer3_va_base;
 645
 646 /*
 647  * How long is the timer interval?
 648  */
 649 #define TIMER_INTERVAL  (TICKS_PER_uSEC * mSEC_10)
 650 #if TIMER_INTERVAL >= 0x100000
 651 #define TIMER_RELOAD    (TIMER_INTERVAL >> 8)
 652 #define TIMER_DIVISOR   (TIMER_CTRL_DIV256)
 653 #define TICKS2USECS(x)  (256 * (x) / TICKS_PER_uSEC)
 654 #elif TIMER_INTERVAL >= 0x10000
 655 #define TIMER_RELOAD    (TIMER_INTERVAL >> 4)           /* Divide by 16 */
 656 #define TIMER_DIVISOR   (TIMER_CTRL_DIV16)
 657 #define TICKS2USECS(x)  (16 * (x) / TICKS_PER_uSEC)
 658 #else
 659 #define TIMER_RELOAD    (TIMER_INTERVAL)
 660 #define TIMER_DIVISOR   (TIMER_CTRL_DIV1)
 661 #define TICKS2USECS(x)  ((x) / TICKS_PER_uSEC)
 662 #endif
 663
 664 static void timer_set_mode(enum clock_event_mode mode,
 665                            struct clock_event_device *clk)
 666 {
 667         unsigned long ctrl;
 668
 669         switch(mode) {
 670         case CLOCK_EVT_MODE_PERIODIC:
 671                 writel(TIMER_RELOAD, timer0_va_base + TIMER_LOAD);
 672
 673                 ctrl = TIMER_CTRL_PERIODIC;
 674                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
 675                 break;
 676         case CLOCK_EVT_MODE_ONESHOT:
 677                 /* period set, and timer enabled in 'next_event' hook */
 678                 ctrl = TIMER_CTRL_ONESHOT;
 679                 ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
 680                 break;
 681         case CLOCK_EVT_MODE_UNUSED:
 682         case CLOCK_EVT_MODE_SHUTDOWN:
 683         default:
 684                 ctrl = 0;
 685         }
 686
 687         writel(ctrl, timer0_va_base + TIMER_CTRL);
 688 }
 689
 690 static int timer_set_next_event(unsigned long evt,
 691                                 struct clock_event_device *unused)
 692 {
 693         unsigned long ctrl = readl(timer0_va_base + TIMER_CTRL);
 694
 695         writel(evt, timer0_va_base + TIMER_LOAD);
 696         writel(ctrl | TIMER_CTRL_ENABLE, timer0_va_base + TIMER_CTRL);
 697
 698         return 0;
 699 }
 700
 701 static struct clock_event_device timer0_clockevent =     {
 702         .name           = "timer0",
 703         .shift          = 32,
 704         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
 705         .set_mode       = timer_set_mode,
 706         .set_next_event = timer_set_next_event,
 707         .rating         = 300,
 708         .cpumask        = cpu_all_mask,
 709 };
 710
 711 static void __init realview_clockevents_init(unsigned int timer_irq)
 712 {
 713         timer0_clockevent.irq = timer_irq;
 714         timer0_clockevent.mult =
 715                 div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
 716         timer0_clockevent.max_delta_ns =
 717                 clockevent_delta2ns(0xffffffff, &timer0_clockevent);
 718         timer0_clockevent.min_delta_ns =
 719                 clockevent_delta2ns(0xf, &timer0_clockevent);
 720
 721         clockevents_register_device(&timer0_clockevent);
 722 }
 723
 724 /*
 725  * IRQ handler for the timer
 726  */
 727 static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
 728 {
 729         struct clock_event_device *evt = &timer0_clockevent;
 730
 731         /* clear the interrupt */
 732         writel(1, timer0_va_base + TIMER_INTCLR);
 733
 734         evt->event_handler(evt);
 735
 736         return IRQ_HANDLED;
 737 }
 738
 739 static struct irqaction realview_timer_irq = {
 740         .name           = "RealView Timer Tick",
 741         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 742         .handler        = realview_timer_interrupt,
 743 };
 744
 745 static cycle_t realview_get_cycles(struct clocksource *cs)
 746 {
 747         return ~readl(timer3_va_base + TIMER_VALUE);
 748 }
 749
 750 static struct clocksource clocksource_realview = {
 751         .name   = "timer3",
 752         .rating = 200,
 753         .read   = realview_get_cycles,
 754         .mask   = CLOCKSOURCE_MASK(32),
 755         .shift  = 20,
 756         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 757 };
 758
 759 static void __init realview_clocksource_init(void)
 760 {
 761         /* setup timer 0 as free-running clocksource */
 762         writel(0, timer3_va_base + TIMER_CTRL);
 763         writel(0xffffffff, timer3_va_base + TIMER_LOAD);
 764         writel(0xffffffff, timer3_va_base + TIMER_VALUE);
 765         writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
 766                 timer3_va_base + TIMER_CTRL);
 767
 768         clocksource_realview.mult =
 769                 clocksource_khz2mult(1000, clocksource_realview.shift);
 770         clocksource_register(&clocksource_realview);
 771 }
 772
 773 /*
 774  * Set up the clock source and clock events devices
 775  */
 776 void __init realview_timer_init(unsigned int timer_irq)
 777 {
 778         u32 val;
 779
 780         /*
 781          * set clock frequency:
 782          *      REALVIEW_REFCLK is 32KHz
 783          *      REALVIEW_TIMCLK is 1MHz
 784          */
 785         val = readl(__io_address(REALVIEW_SCTL_BASE));
 786         writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
 787                (REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) |
 788                (REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
 789                (REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
 790                __io_address(REALVIEW_SCTL_BASE));
 791
 792         /*
 793          * Initialise to a known state (all timers off)
 794          */
 795         writel(0, timer0_va_base + TIMER_CTRL);
 796         writel(0, timer1_va_base + TIMER_CTRL);
 797         writel(0, timer2_va_base + TIMER_CTRL);
 798         writel(0, timer3_va_base + TIMER_CTRL);
 799
 800         /*
 801          * Make irqs happen for the system timer
 802          */
 803         setup_irq(timer_irq, &realview_timer_irq);
 804
 805         realview_clocksource_init();
 806         realview_clockevents_init(timer_irq);
 807 }
 808
 809 /*
 810  * Setup the memory banks.
 811  */
 812 void realview_fixup(struct machine_desc *mdesc, struct tag *tags, char **from,
 813                     struct meminfo *meminfo)
 814 {
 815         /*
 816          * Most RealView platforms have 512MB contiguous RAM at 0x70000000.
 817          * Half of this is mirrored at 0.
 818          */
 819 #ifdef CONFIG_REALVIEW_HIGH_PHYS_OFFSET
 820         meminfo->bank[0].start = 0x70000000;
 821         meminfo->bank[0].size = SZ_512M;
 822         meminfo->nr_banks = 1;
 823 #else
 824         meminfo->bank[0].start = 0;
 825         meminfo->bank[0].size = SZ_256M;
 826         meminfo->nr_banks = 1;
 827 #endif
 828 }