arch/arm/plat-omap/common.c

   1 /*
   2  * linux/arch/arm/plat-omap/common.c
   3  *
   4  * Code common to all OMAP machines.
   5  * The file is created by Tony Lindgren <tony@atomide.com>
   6  *
   7  * Copyright (C) 2009 Texas Instruments
   8  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/delay.h>
  18 #include <linux/console.h>
  19 #include <linux/serial.h>
  20 #include <linux/tty.h>
  21 #include <linux/serial_8250.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/clk.h>
  24 #include <linux/io.h>
  25
  26 #include <mach/hardware.h>
  27 #include <asm/system.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/mach/map.h>
  30 #include <asm/setup.h>
  31
  32 #include <plat/common.h>
  33 #include <plat/board.h>
  34 #include <plat/control.h>
  35 #include <plat/mux.h>
  36 #include <plat/fpga.h>
  37 #include <plat/serial.h>
  38
  39 #include <plat/clock.h>
  40
  41 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
  42 # include "../mach-omap2/sdrc.h"
  43 #endif
  44
  45 #define NO_LENGTH_CHECK 0xffffffff
  46
  47 unsigned char omap_bootloader_tag[512];
  48 int omap_bootloader_tag_len;
  49
  50 struct omap_board_config_kernel *omap_board_config;
  51 int omap_board_config_size;
  52
  53 /* used by omap-smp.c and board-4430sdp.c */
  54 void __iomem *gic_cpu_base_addr;
  55
  56 static const void *get_config(u16 tag, size_t len, int skip, size_t *len_out)
  57 {
  58         struct omap_board_config_kernel *kinfo = NULL;
  59         int i;
  60
  61         /* Try to find the config from the board-specific structures
  62          * in the kernel. */
  63         for (i = 0; i < omap_board_config_size; i++) {
  64                 if (omap_board_config[i].tag == tag) {
  65                         if (skip == 0) {
  66                                 kinfo = &omap_board_config[i];
  67                                 break;
  68                         } else {
  69                                 skip--;
  70                         }
  71                 }
  72         }
  73         if (kinfo == NULL)
  74                 return NULL;
  75         return kinfo->data;
  76 }
  77
  78 const void *__omap_get_config(u16 tag, size_t len, int nr)
  79 {
  80         return get_config(tag, len, nr, NULL);
  81 }
  82 EXPORT_SYMBOL(__omap_get_config);
  83
  84 const void *omap_get_var_config(u16 tag, size_t *len)
  85 {
  86         return get_config(tag, NO_LENGTH_CHECK, 0, len);
  87 }
  88 EXPORT_SYMBOL(omap_get_var_config);
  89
  90 /*
  91  * 32KHz clocksource ... always available, on pretty most chips except
  92  * OMAP 730 and 1510.  Other timers could be used as clocksources, with
  93  * higher resolution in free-running counter modes (e.g. 12 MHz xtal),
  94  * but systems won't necessarily want to spend resources that way.
  95  */
  96
  97 #define OMAP16XX_TIMER_32K_SYNCHRONIZED         0xfffbc410
  98
  99 #if !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX))
 100
 101 #include <linux/clocksource.h>
 102
 103 #ifdef CONFIG_ARCH_OMAP16XX
 104 static cycle_t omap16xx_32k_read(struct clocksource *cs)
 105 {
 106         return omap_readl(OMAP16XX_TIMER_32K_SYNCHRONIZED);
 107 }
 108 #else
 109 #define omap16xx_32k_read       NULL
 110 #endif
 111
 112 #ifdef CONFIG_ARCH_OMAP2420
 113 static cycle_t omap2420_32k_read(struct clocksource *cs)
 114 {
 115         return omap_readl(OMAP2420_32KSYNCT_BASE + 0x10);
 116 }
 117 #else
 118 #define omap2420_32k_read       NULL
 119 #endif
 120
 121 #ifdef CONFIG_ARCH_OMAP2430
 122 static cycle_t omap2430_32k_read(struct clocksource *cs)
 123 {
 124         return omap_readl(OMAP2430_32KSYNCT_BASE + 0x10);
 125 }
 126 #else
 127 #define omap2430_32k_read       NULL
 128 #endif
 129
 130 #ifdef CONFIG_ARCH_OMAP3
 131 static cycle_t omap34xx_32k_read(struct clocksource *cs)
 132 {
 133         return omap_readl(OMAP3430_32KSYNCT_BASE + 0x10);
 134 }
 135 #else
 136 #define omap34xx_32k_read       NULL
 137 #endif
 138
 139 #ifdef CONFIG_ARCH_OMAP4
 140 static cycle_t omap44xx_32k_read(struct clocksource *cs)
 141 {
 142         return omap_readl(OMAP4430_32KSYNCT_BASE + 0x10);
 143 }
 144 #else
 145 #define omap44xx_32k_read       NULL
 146 #endif
 147
 148 /*
 149  * Kernel assumes that sched_clock can be called early but may not have
 150  * things ready yet.
 151  */
 152 static cycle_t omap_32k_read_dummy(struct clocksource *cs)
 153 {
 154         return 0;
 155 }
 156
 157 static struct clocksource clocksource_32k = {
 158         .name           = "32k_counter",
 159         .rating         = 250,
 160         .read           = omap_32k_read_dummy,
 161         .mask           = CLOCKSOURCE_MASK(32),
 162         .shift          = 10,
 163         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 164 };
 165
 166 /*
 167  * Returns current time from boot in nsecs. It's OK for this to wrap
 168  * around for now, as it's just a relative time stamp.
 169  */
 170 unsigned long long sched_clock(void)
 171 {
 172         return clocksource_cyc2ns(clocksource_32k.read(&clocksource_32k),
 173                                   clocksource_32k.mult, clocksource_32k.shift);
 174 }
 175
 176 /**
 177  * read_persistent_clock -  Return time from a persistent clock.
 178  *
 179  * Reads the time from a source which isn't disabled during PM, the
 180  * 32k sync timer.  Convert the cycles elapsed since last read into
 181  * nsecs and adds to a monotonically increasing timespec.
 182  */
 183 static struct timespec persistent_ts;
 184 static cycles_t cycles, last_cycles;
 185 void read_persistent_clock(struct timespec *ts)
 186 {
 187         unsigned long long nsecs;
 188         cycles_t delta;
 189         struct timespec *tsp = &persistent_ts;
 190
 191         last_cycles = cycles;
 192         cycles = clocksource_32k.read(&clocksource_32k);
 193         delta = cycles - last_cycles;
 194
 195         nsecs = clocksource_cyc2ns(delta,
 196                                    clocksource_32k.mult, clocksource_32k.shift);
 197
 198         timespec_add_ns(tsp, nsecs);
 199         *ts = *tsp;
 200 }
 201
 202 static int __init omap_init_clocksource_32k(void)
 203 {
 204         static char err[] __initdata = KERN_ERR
 205                         "%s: can't register clocksource!\n";
 206
 207         if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
 208                 struct clk *sync_32k_ick;
 209
 210                 if (cpu_is_omap16xx())
 211                         clocksource_32k.read = omap16xx_32k_read;
 212                 else if (cpu_is_omap2420())
 213                         clocksource_32k.read = omap2420_32k_read;
 214                 else if (cpu_is_omap2430())
 215                         clocksource_32k.read = omap2430_32k_read;
 216                 else if (cpu_is_omap34xx())
 217                         clocksource_32k.read = omap34xx_32k_read;
 218                 else if (cpu_is_omap44xx())
 219                         clocksource_32k.read = omap44xx_32k_read;
 220                 else
 221                         return -ENODEV;
 222
 223                 sync_32k_ick = clk_get(NULL, "omap_32ksync_ick");
 224                 if (sync_32k_ick)
 225                         clk_enable(sync_32k_ick);
 226
 227                 clocksource_32k.mult = clocksource_hz2mult(32768,
 228                                             clocksource_32k.shift);
 229
 230                 if (clocksource_register(&clocksource_32k))
 231                         printk(err, clocksource_32k.name);
 232         }
 233         return 0;
 234 }
 235 arch_initcall(omap_init_clocksource_32k);
 236
 237 #endif  /* !(defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP15XX)) */
 238
 239 /* Global address base setup code */
 240
 241 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 242
 243 static void __init __omap2_set_globals(struct omap_globals *omap2_globals)
 244 {
 245         omap2_set_globals_tap(omap2_globals);
 246         omap2_set_globals_sdrc(omap2_globals);
 247         omap2_set_globals_control(omap2_globals);
 248         omap2_set_globals_prcm(omap2_globals);
 249         omap2_set_globals_uart(omap2_globals);
 250 }
 251
 252 #endif
 253
 254 #if defined(CONFIG_ARCH_OMAP2420)
 255
 256 static struct omap_globals omap242x_globals = {
 257         .class  = OMAP242X_CLASS,
 258         .tap    = OMAP2_L4_IO_ADDRESS(0x48014000),
 259         .sdrc   = OMAP2420_SDRC_BASE,
 260         .sms    = OMAP2420_SMS_BASE,
 261         .ctrl   = OMAP2420_CTRL_BASE,
 262         .prm    = OMAP2420_PRM_BASE,
 263         .cm     = OMAP2420_CM_BASE,
 264         .uart1_phys     = OMAP2_UART1_BASE,
 265         .uart2_phys     = OMAP2_UART2_BASE,
 266         .uart3_phys     = OMAP2_UART3_BASE,
 267 };
 268
 269 void __init omap2_set_globals_242x(void)
 270 {
 271         __omap2_set_globals(&omap242x_globals);
 272 }
 273 #endif
 274
 275 #if defined(CONFIG_ARCH_OMAP2430)
 276
 277 static struct omap_globals omap243x_globals = {
 278         .class  = OMAP243X_CLASS,
 279         .tap    = OMAP2_L4_IO_ADDRESS(0x4900a000),
 280         .sdrc   = OMAP243X_SDRC_BASE,
 281         .sms    = OMAP243X_SMS_BASE,
 282         .ctrl   = OMAP243X_CTRL_BASE,
 283         .prm    = OMAP2430_PRM_BASE,
 284         .cm     = OMAP2430_CM_BASE,
 285         .uart1_phys     = OMAP2_UART1_BASE,
 286         .uart2_phys     = OMAP2_UART2_BASE,
 287         .uart3_phys     = OMAP2_UART3_BASE,
 288 };
 289
 290 void __init omap2_set_globals_243x(void)
 291 {
 292         __omap2_set_globals(&omap243x_globals);
 293 }
 294 #endif
 295
 296 #if defined(CONFIG_ARCH_OMAP3)
 297
 298 static struct omap_globals omap3_globals = {
 299         .class  = OMAP343X_CLASS,
 300         .tap    = OMAP2_L4_IO_ADDRESS(0x4830A000),
 301         .sdrc   = OMAP343X_SDRC_BASE,
 302         .sms    = OMAP343X_SMS_BASE,
 303         .ctrl   = OMAP343X_CTRL_BASE,
 304         .prm    = OMAP3430_PRM_BASE,
 305         .cm     = OMAP3430_CM_BASE,
 306         .uart1_phys     = OMAP3_UART1_BASE,
 307         .uart2_phys     = OMAP3_UART2_BASE,
 308         .uart3_phys     = OMAP3_UART3_BASE,
 309 };
 310
 311 void __init omap2_set_globals_343x(void)
 312 {
 313         __omap2_set_globals(&omap3_globals);
 314 }
 315
 316 void __init omap2_set_globals_36xx(void)
 317 {
 318         omap3_globals.uart4_phys = OMAP3_UART4_BASE;
 319
 320         __omap2_set_globals(&omap3_globals);
 321 }
 322 #endif
 323
 324 #if defined(CONFIG_ARCH_OMAP4)
 325 static struct omap_globals omap4_globals = {
 326         .class  = OMAP443X_CLASS,
 327         .tap    = OMAP2_L4_IO_ADDRESS(OMAP443X_SCM_BASE),
 328         .ctrl   = OMAP443X_CTRL_BASE,
 329         .prm    = OMAP4430_PRM_BASE,
 330         .cm     = OMAP4430_CM_BASE,
 331         .cm2    = OMAP4430_CM2_BASE,
 332         .uart1_phys     = OMAP4_UART1_BASE,
 333         .uart2_phys     = OMAP4_UART2_BASE,
 334         .uart3_phys     = OMAP4_UART3_BASE,
 335         .uart4_phys     = OMAP4_UART4_BASE,
 336 };
 337
 338 void __init omap2_set_globals_443x(void)
 339 {
 340         omap2_set_globals_tap(&omap4_globals);
 341         omap2_set_globals_control(&omap4_globals);
 342         omap2_set_globals_prcm(&omap4_globals);
 343         omap2_set_globals_uart(&omap4_globals);
 344 }
 345 #endif
 346