arch/arm/plat-omap/devices.c

   1 /*
   2  * linux/arch/arm/plat-omap/devices.c
   3  *
   4  * Common platform device setup/initialization for OMAP1 and OMAP2
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11 #include <linux/gpio.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/memblock.h>
  19
  20 #include <mach/hardware.h>
  21 #include <asm/mach-types.h>
  22 #include <asm/mach/map.h>
  23 #include <asm/memblock.h>
  24
  25 #include <plat/tc.h>
  26 #include <plat/board.h>
  27 #include <plat/mmc.h>
  28 #include <plat/menelaus.h>
  29 #include <plat/omap44xx.h>
  30
  31 /*-------------------------------------------------------------------------*/
  32
  33 #if defined(CONFIG_HW_RANDOM_OMAP) || defined(CONFIG_HW_RANDOM_OMAP_MODULE)
  34
  35 #ifdef CONFIG_ARCH_OMAP2
  36 #define OMAP_RNG_BASE           0x480A0000
  37 #else
  38 #define OMAP_RNG_BASE           0xfffe5000
  39 #endif
  40
  41 static struct resource rng_resources[] = {
  42         {
  43                 .start          = OMAP_RNG_BASE,
  44                 .end            = OMAP_RNG_BASE + 0x4f,
  45                 .flags          = IORESOURCE_MEM,
  46         },
  47 };
  48
  49 static struct platform_device omap_rng_device = {
  50         .name           = "omap_rng",
  51         .id             = -1,
  52         .num_resources  = ARRAY_SIZE(rng_resources),
  53         .resource       = rng_resources,
  54 };
  55
  56 static void omap_init_rng(void)
  57 {
  58         (void) platform_device_register(&omap_rng_device);
  59 }
  60 #else
  61 static inline void omap_init_rng(void) {}
  62 #endif
  63
  64 /*
  65  * This gets called after board-specific INIT_MACHINE, and initializes most
  66  * on-chip peripherals accessible on this board (except for few like USB):
  67  *
  68  *  (a) Does any "standard config" pin muxing needed.  Board-specific
  69  *      code will have muxed GPIO pins and done "nonstandard" setup;
  70  *      that code could live in the boot loader.
  71  *  (b) Populating board-specific platform_data with the data drivers
  72  *      rely on to handle wiring variations.
  73  *  (c) Creating platform devices as meaningful on this board and
  74  *      with this kernel configuration.
  75  *
  76  * Claiming GPIOs, and setting their direction and initial values, is the
  77  * responsibility of the device drivers.  So is responding to probe().
  78  *
  79  * Board-specific knowledge like creating devices or pin setup is to be
  80  * kept out of drivers as much as possible.  In particular, pin setup
  81  * may be handled by the boot loader, and drivers should expect it will
  82  * normally have been done by the time they're probed.
  83  */
  84 static int __init omap_init_devices(void)
  85 {
  86         /* please keep these calls, and their implementations above,
  87          * in alphabetical order so they're easier to sort through.
  88          */
  89         omap_init_rng();
  90         return 0;
  91 }
  92 arch_initcall(omap_init_devices);