arch/arm/mach-u300/core.c

   1 /*
   2  *
   3  * arch/arm/mach-u300/core.c
   4  *
   5  *
   6  * Copyright (C) 2007-2012 ST-Ericsson SA
   7  * License terms: GNU General Public License (GPL) version 2
   8  * Core platform support, IRQ handling and device definitions.
   9  * Author: Linus Walleij <linus.walleij@stericsson.com>
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/pinctrl/machine.h>
  13 #include <linux/pinctrl/pinconf-generic.h>
  14 #include <linux/platform_data/clk-u300.h>
  15 #include <linux/irqchip.h>
  16 #include <linux/of_address.h>
  17 #include <linux/of_platform.h>
  18 #include <linux/clocksource.h>
  19 #include <linux/clk.h>
  20
  21 #include <asm/mach/map.h>
  22 #include <asm/mach/arch.h>
  23
  24 /*
  25  * These are the large blocks of memory allocated for I/O.
  26  * the defines are used for setting up the I/O memory mapping.
  27  */
  28
  29 /* NAND Flash CS0 */
  30 #define U300_NAND_CS0_PHYS_BASE         0x80000000
  31 /* NFIF */
  32 #define U300_NAND_IF_PHYS_BASE          0x9f800000
  33 /* ALE, CLE offset for FSMC NAND */
  34 #define PLAT_NAND_CLE                   (1 << 16)
  35 #define PLAT_NAND_ALE                   (1 << 17)
  36 /* AHB Peripherals */
  37 #define U300_AHB_PER_PHYS_BASE          0xa0000000
  38 #define U300_AHB_PER_VIRT_BASE          0xff010000
  39 /* FAST Peripherals */
  40 #define U300_FAST_PER_PHYS_BASE         0xc0000000
  41 #define U300_FAST_PER_VIRT_BASE         0xff020000
  42 /* SLOW Peripherals */
  43 #define U300_SLOW_PER_PHYS_BASE         0xc0010000
  44 #define U300_SLOW_PER_VIRT_BASE         0xff000000
  45 /* Boot ROM */
  46 #define U300_BOOTROM_PHYS_BASE          0xffff0000
  47 #define U300_BOOTROM_VIRT_BASE          0xffff0000
  48 /* SEMI config base */
  49 #define U300_SEMI_CONFIG_BASE           0x2FFE0000
  50
  51 /*
  52  * AHB peripherals
  53  */
  54
  55 /* AHB Peripherals Bridge Controller */
  56 #define U300_AHB_BRIDGE_BASE            (U300_AHB_PER_PHYS_BASE+0x0000)
  57 /* Vectored Interrupt Controller 0, servicing 32 interrupts */
  58 #define U300_INTCON0_BASE               (U300_AHB_PER_PHYS_BASE+0x1000)
  59 #define U300_INTCON0_VBASE              IOMEM(U300_AHB_PER_VIRT_BASE+0x1000)
  60 /* Vectored Interrupt Controller 1, servicing 32 interrupts */
  61 #define U300_INTCON1_BASE               (U300_AHB_PER_PHYS_BASE+0x2000)
  62 #define U300_INTCON1_VBASE              IOMEM(U300_AHB_PER_VIRT_BASE+0x2000)
  63 /* Memory Stick Pro (MSPRO) controller */
  64 #define U300_MSPRO_BASE                 (U300_AHB_PER_PHYS_BASE+0x3000)
  65 /* EMIF Configuration Area */
  66 #define U300_EMIF_CFG_BASE              (U300_AHB_PER_PHYS_BASE+0x4000)
  67
  68 /*
  69  * FAST peripherals
  70  */
  71
  72 /* FAST bridge control */
  73 #define U300_FAST_BRIDGE_BASE           (U300_FAST_PER_PHYS_BASE+0x0000)
  74 /* MMC/SD controller */
  75 #define U300_MMCSD_BASE                 (U300_FAST_PER_PHYS_BASE+0x1000)
  76 /* PCM I2S0 controller */
  77 #define U300_PCM_I2S0_BASE              (U300_FAST_PER_PHYS_BASE+0x2000)
  78 /* PCM I2S1 controller */
  79 #define U300_PCM_I2S1_BASE              (U300_FAST_PER_PHYS_BASE+0x3000)
  80 /* I2C0 controller */
  81 #define U300_I2C0_BASE                  (U300_FAST_PER_PHYS_BASE+0x4000)
  82 /* I2C1 controller */
  83 #define U300_I2C1_BASE                  (U300_FAST_PER_PHYS_BASE+0x5000)
  84 /* SPI controller */
  85 #define U300_SPI_BASE                   (U300_FAST_PER_PHYS_BASE+0x6000)
  86 /* Fast UART1 on U335 only */
  87 #define U300_UART1_BASE                 (U300_FAST_PER_PHYS_BASE+0x7000)
  88
  89 /*
  90  * SLOW peripherals
  91  */
  92
  93 /* SLOW bridge control */
  94 #define U300_SLOW_BRIDGE_BASE           (U300_SLOW_PER_PHYS_BASE)
  95 /* SYSCON */
  96 #define U300_SYSCON_BASE                (U300_SLOW_PER_PHYS_BASE+0x1000)
  97 #define U300_SYSCON_VBASE               IOMEM(U300_SLOW_PER_VIRT_BASE+0x1000)
  98 /* Watchdog */
  99 #define U300_WDOG_BASE                  (U300_SLOW_PER_PHYS_BASE+0x2000)
 100 /* UART0 */
 101 #define U300_UART0_BASE                 (U300_SLOW_PER_PHYS_BASE+0x3000)
 102 /* APP side special timer */
 103 #define U300_TIMER_APP_BASE             (U300_SLOW_PER_PHYS_BASE+0x4000)
 104 #define U300_TIMER_APP_VBASE            IOMEM(U300_SLOW_PER_VIRT_BASE+0x4000)
 105 /* Keypad */
 106 #define U300_KEYPAD_BASE                (U300_SLOW_PER_PHYS_BASE+0x5000)
 107 /* GPIO */
 108 #define U300_GPIO_BASE                  (U300_SLOW_PER_PHYS_BASE+0x6000)
 109 /* RTC */
 110 #define U300_RTC_BASE                   (U300_SLOW_PER_PHYS_BASE+0x7000)
 111 /* Bus tracer */
 112 #define U300_BUSTR_BASE                 (U300_SLOW_PER_PHYS_BASE+0x8000)
 113 /* Event handler (hardware queue) */
 114 #define U300_EVHIST_BASE                (U300_SLOW_PER_PHYS_BASE+0x9000)
 115 /* Genric Timer */
 116 #define U300_TIMER_BASE                 (U300_SLOW_PER_PHYS_BASE+0xa000)
 117 /* PPM */
 118 #define U300_PPM_BASE                   (U300_SLOW_PER_PHYS_BASE+0xb000)
 119
 120 /*
 121  * REST peripherals
 122  */
 123
 124 /* ISP (image signal processor) */
 125 #define U300_ISP_BASE                   (0xA0008000)
 126 /* DMA Controller base */
 127 #define U300_DMAC_BASE                  (0xC0020000)
 128 /* MSL Base */
 129 #define U300_MSL_BASE                   (0xc0022000)
 130 /* APEX Base */
 131 #define U300_APEX_BASE                  (0xc0030000)
 132 /* Video Encoder Base */
 133 #define U300_VIDEOENC_BASE              (0xc0080000)
 134 /* XGAM Base */
 135 #define U300_XGAM_BASE                  (0xd0000000)
 136
 137 /*
 138  * SYSCON addresses applicable to the core machine.
 139  */
 140
 141 /* Chip ID register 16bit (R/-) */
 142 #define U300_SYSCON_CIDR                                        (0x400)
 143 /* SMCR */
 144 #define U300_SYSCON_SMCR                                        (0x4d0)
 145 #define U300_SYSCON_SMCR_FIELD_MASK                             (0x000e)
 146 #define U300_SYSCON_SMCR_SEMI_SREFACK_IND                       (0x0008)
 147 #define U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE                    (0x0004)
 148 #define U300_SYSCON_SMCR_SEMI_EXT_BOOT_MODE_ENABLE              (0x0002)
 149 /* CPU_SW_DBGEN Software Debug Enable 16bit (R/W) */
 150 #define U300_SYSCON_CSDR                                        (0x4f0)
 151 #define U300_SYSCON_CSDR_SW_DEBUG_ENABLE                        (0x0001)
 152 /* PRINT_CONTROL Print Control 16bit (R/-) */
 153 #define U300_SYSCON_PCR                                         (0x4f8)
 154 #define U300_SYSCON_PCR_SERV_IND                                (0x0001)
 155 /* BOOT_CONTROL 16bit (R/-) */
 156 #define U300_SYSCON_BCR                                         (0x4fc)
 157 #define U300_SYSCON_BCR_ACC_CPU_SUBSYS_VINITHI_IND              (0x0400)
 158 #define U300_SYSCON_BCR_APP_CPU_SUBSYS_VINITHI_IND              (0x0200)
 159 #define U300_SYSCON_BCR_EXTRA_BOOT_OPTION_MASK                  (0x01FC)
 160 #define U300_SYSCON_BCR_APP_BOOT_SERV_MASK                      (0x0003)
 161
 162 static void __iomem *syscon_base;
 163
 164 /*
 165  * Static I/O mappings that are needed for booting the U300 platforms. The
 166  * only things we need are the areas where we find the timer, syscon and
 167  * intcon, since the remaining device drivers will map their own memory
 168  * physical to virtual as the need arise.
 169  */
 170 static struct map_desc u300_io_desc[] __initdata = {
 171         {
 172                 .virtual        = U300_SLOW_PER_VIRT_BASE,
 173                 .pfn            = __phys_to_pfn(U300_SLOW_PER_PHYS_BASE),
 174                 .length         = SZ_64K,
 175                 .type           = MT_DEVICE,
 176         },
 177         {
 178                 .virtual        = U300_AHB_PER_VIRT_BASE,
 179                 .pfn            = __phys_to_pfn(U300_AHB_PER_PHYS_BASE),
 180                 .length         = SZ_32K,
 181                 .type           = MT_DEVICE,
 182         },
 183         {
 184                 .virtual        = U300_FAST_PER_VIRT_BASE,
 185                 .pfn            = __phys_to_pfn(U300_FAST_PER_PHYS_BASE),
 186                 .length         = SZ_32K,
 187                 .type           = MT_DEVICE,
 188         },
 189 };
 190
 191 static void __init u300_map_io(void)
 192 {
 193         iotable_init(u300_io_desc, ARRAY_SIZE(u300_io_desc));
 194 }
 195
 196 static unsigned long pin_pullup_conf[] = {
 197         PIN_CONF_PACKED(PIN_CONFIG_BIAS_PULL_UP, 1),
 198 };
 199
 200 static unsigned long pin_highz_conf[] = {
 201         PIN_CONF_PACKED(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0),
 202 };
 203
 204 /* Pin control settings */
 205 static struct pinctrl_map __initdata u300_pinmux_map[] = {
 206         /* anonymous maps for chip power and EMIFs */
 207         PIN_MAP_MUX_GROUP_HOG_DEFAULT("pinctrl-u300", NULL, "power"),
 208         PIN_MAP_MUX_GROUP_HOG_DEFAULT("pinctrl-u300", NULL, "emif0"),
 209         PIN_MAP_MUX_GROUP_HOG_DEFAULT("pinctrl-u300", NULL, "emif1"),
 210         /* per-device maps for MMC/SD, SPI and UART */
 211         PIN_MAP_MUX_GROUP_DEFAULT("mmci",  "pinctrl-u300", NULL, "mmc0"),
 212         PIN_MAP_MUX_GROUP_DEFAULT("pl022", "pinctrl-u300", NULL, "spi0"),
 213         PIN_MAP_MUX_GROUP_DEFAULT("uart0", "pinctrl-u300", NULL, "uart0"),
 214         /* This pin is used for clock return rather than GPIO */
 215         PIN_MAP_CONFIGS_PIN_DEFAULT("mmci", "pinctrl-u300", "PIO APP GPIO 11",
 216                                     pin_pullup_conf),
 217         /* This pin is used for card detect */
 218         PIN_MAP_CONFIGS_PIN_DEFAULT("mmci", "pinctrl-u300", "PIO MS INS",
 219                                     pin_highz_conf),
 220 };
 221
 222 struct db_chip {
 223         u16 chipid;
 224         const char *name;
 225 };
 226
 227 /*
 228  * This is a list of the Digital Baseband chips used in the U300 platform.
 229  */
 230 static struct db_chip db_chips[] __initdata = {
 231         {
 232                 .chipid = 0xb800,
 233                 .name = "DB3000",
 234         },
 235         {
 236                 .chipid = 0xc000,
 237                 .name = "DB3100",
 238         },
 239         {
 240                 .chipid = 0xc800,
 241                 .name = "DB3150",
 242         },
 243         {
 244                 .chipid = 0xd800,
 245                 .name = "DB3200",
 246         },
 247         {
 248                 .chipid = 0xe000,
 249                 .name = "DB3250",
 250         },
 251         {
 252                 .chipid = 0xe800,
 253                 .name = "DB3210",
 254         },
 255         {
 256                 .chipid = 0xf000,
 257                 .name = "DB3350 P1x",
 258         },
 259         {
 260                 .chipid = 0xf100,
 261                 .name = "DB3350 P2x",
 262         },
 263         {
 264                 .chipid = 0x0000, /* List terminator */
 265                 .name = NULL,
 266         }
 267 };
 268
 269 static void __init u300_init_check_chip(void)
 270 {
 271
 272         u16 val;
 273         struct db_chip *chip;
 274         const char *chipname;
 275         const char unknown[] = "UNKNOWN";
 276
 277         /* Read out and print chip ID */
 278         val = readw(syscon_base + U300_SYSCON_CIDR);
 279         /* This is in funky bigendian order... */
 280         val = (val & 0xFFU) << 8 | (val >> 8);
 281         chip = db_chips;
 282         chipname = unknown;
 283
 284         for ( ; chip->chipid; chip++) {
 285                 if (chip->chipid == (val & 0xFF00U)) {
 286                         chipname = chip->name;
 287                         break;
 288                 }
 289         }
 290         printk(KERN_INFO "Initializing U300 system on %s baseband chip " \
 291                "(chip ID 0x%04x)\n", chipname, val);
 292
 293         if ((val & 0xFF00U) != 0xf000 && (val & 0xFF00U) != 0xf100) {
 294                 printk(KERN_ERR "Platform configured for BS335 " \
 295                        " with DB3350 but %s detected, expect problems!",
 296                        chipname);
 297         }
 298 }
 299
 300 /* Forward declare this function from the watchdog */
 301 void coh901327_watchdog_reset(void);
 302
 303 static void u300_restart(enum reboot_mode mode, const char *cmd)
 304 {
 305         switch (mode) {
 306         case REBOOT_SOFT:
 307         case REBOOT_HARD:
 308 #ifdef CONFIG_COH901327_WATCHDOG
 309                 coh901327_watchdog_reset();
 310 #endif
 311                 break;
 312         default:
 313                 /* Do nothing */
 314                 break;
 315         }
 316         /* Wait for system do die/reset. */
 317         while (1);
 318 }
 319
 320 /* These are mostly to get the right device names for the clock lookups */
 321 static struct of_dev_auxdata u300_auxdata_lookup[] __initdata = {
 322         OF_DEV_AUXDATA("stericsson,pinctrl-u300", U300_SYSCON_BASE,
 323                 "pinctrl-u300", NULL),
 324         OF_DEV_AUXDATA("stericsson,gpio-coh901", U300_GPIO_BASE,
 325                 "u300-gpio", NULL),
 326         OF_DEV_AUXDATA("stericsson,coh901327", U300_WDOG_BASE,
 327                 "coh901327_wdog", NULL),
 328         OF_DEV_AUXDATA("stericsson,coh901331", U300_RTC_BASE,
 329                 "rtc-coh901331", NULL),
 330         OF_DEV_AUXDATA("stericsson,coh901318", U300_DMAC_BASE,
 331                 "coh901318", NULL),
 332         OF_DEV_AUXDATA("stericsson,fsmc-nand", U300_NAND_IF_PHYS_BASE,
 333                 "fsmc-nand", NULL),
 334         OF_DEV_AUXDATA("arm,primecell", U300_UART0_BASE,
 335                 "uart0", NULL),
 336         OF_DEV_AUXDATA("arm,primecell", U300_UART1_BASE,
 337                 "uart1", NULL),
 338         OF_DEV_AUXDATA("arm,primecell", U300_SPI_BASE,
 339                 "pl022", NULL),
 340         OF_DEV_AUXDATA("st,ddci2c", U300_I2C0_BASE,
 341                 "stu300.0", NULL),
 342         OF_DEV_AUXDATA("st,ddci2c", U300_I2C1_BASE,
 343                 "stu300.1", NULL),
 344         OF_DEV_AUXDATA("arm,primecell", U300_MMCSD_BASE,
 345                 "mmci", NULL),
 346         { /* sentinel */ },
 347 };
 348
 349 static void __init u300_init_irq_dt(void)
 350 {
 351         struct device_node *syscon;
 352         struct clk *clk;
 353
 354         syscon = of_find_node_by_path("/syscon@c0011000");
 355         if (!syscon) {
 356                 pr_crit("could not find syscon node\n");
 357                 return;
 358         }
 359         syscon_base = of_iomap(syscon, 0);
 360         if (!syscon_base) {
 361                 pr_crit("could not remap syscon\n");
 362                 return;
 363         }
 364         /* initialize clocking early, we want to clock the INTCON */
 365         u300_clk_init(syscon_base);
 366
 367         /* Bootstrap EMIF and SEMI clocks */
 368         clk = clk_get_sys("pl172", NULL);
 369         BUG_ON(IS_ERR(clk));
 370         clk_prepare_enable(clk);
 371         clk = clk_get_sys("semi", NULL);
 372         BUG_ON(IS_ERR(clk));
 373         clk_prepare_enable(clk);
 374
 375         /* Clock the interrupt controller */
 376         clk = clk_get_sys("intcon", NULL);
 377         BUG_ON(IS_ERR(clk));
 378         clk_prepare_enable(clk);
 379
 380         irqchip_init();
 381 }
 382
 383 static void __init u300_init_machine_dt(void)
 384 {
 385         u16 val;
 386
 387         /* Check what platform we run and print some status information */
 388         u300_init_check_chip();
 389
 390         /* Initialize pinmuxing */
 391         pinctrl_register_mappings(u300_pinmux_map,
 392                                   ARRAY_SIZE(u300_pinmux_map));
 393
 394         of_platform_default_populate(NULL, u300_auxdata_lookup, NULL);
 395
 396         /* Enable SEMI self refresh */
 397         val = readw(syscon_base + U300_SYSCON_SMCR) |
 398                 U300_SYSCON_SMCR_SEMI_SREFREQ_ENABLE;
 399         writew(val, syscon_base + U300_SYSCON_SMCR);
 400 }
 401
 402 static const char * u300_board_compat[] = {
 403         "stericsson,u300",
 404         NULL,
 405 };
 406
 407 DT_MACHINE_START(U300_DT, "U300 S335/B335 (Device Tree)")
 408         .map_io         = u300_map_io,
 409         .init_irq       = u300_init_irq_dt,
 410         .init_time      = clocksource_probe,
 411         .init_machine   = u300_init_machine_dt,
 412         .restart        = u300_restart,
 413         .dt_compat      = u300_board_compat,
 414 MACHINE_END