arch/arm/mach-spear6xx/spear6xx.c

   1 /*
   2  * arch/arm/mach-spear6xx/spear6xx.c
   3  *
   4  * SPEAr6XX machines common source file
   5  *
   6  * Copyright (C) 2009 ST Microelectronics
   7  * Rajeev Kumar<rajeev-dlh.kumar@st.com>
   8  *
   9  * Copyright 2012 Stefan Roese <sr@denx.de>
  10  *
  11  * This file is licensed under the terms of the GNU General Public
  12  * License version 2. This program is licensed "as is" without any
  13  * warranty of any kind, whether express or implied.
  14  */
  15
  16 #include <linux/of.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_platform.h>
  20 #include <asm/hardware/vic.h>
  21 #include <asm/mach/arch.h>
  22 #include <mach/generic.h>
  23 #include <mach/hardware.h>
  24
  25 /* Following will create static virtual/physical mappings */
  26 static struct map_desc spear6xx_io_desc[] __initdata = {
  27         {
  28                 .virtual        = VA_SPEAR6XX_ICM1_UART0_BASE,
  29                 .pfn            = __phys_to_pfn(SPEAR6XX_ICM1_UART0_BASE),
  30                 .length         = SZ_4K,
  31                 .type           = MT_DEVICE
  32         }, {
  33                 .virtual        = VA_SPEAR6XX_CPU_VIC_PRI_BASE,
  34                 .pfn            = __phys_to_pfn(SPEAR6XX_CPU_VIC_PRI_BASE),
  35                 .length         = SZ_4K,
  36                 .type           = MT_DEVICE
  37         }, {
  38                 .virtual        = VA_SPEAR6XX_CPU_VIC_SEC_BASE,
  39                 .pfn            = __phys_to_pfn(SPEAR6XX_CPU_VIC_SEC_BASE),
  40                 .length         = SZ_4K,
  41                 .type           = MT_DEVICE
  42         }, {
  43                 .virtual        = VA_SPEAR6XX_ICM3_SYS_CTRL_BASE,
  44                 .pfn            = __phys_to_pfn(SPEAR6XX_ICM3_SYS_CTRL_BASE),
  45                 .length         = SZ_4K,
  46                 .type           = MT_DEVICE
  47         }, {
  48                 .virtual        = VA_SPEAR6XX_ICM3_MISC_REG_BASE,
  49                 .pfn            = __phys_to_pfn(SPEAR6XX_ICM3_MISC_REG_BASE),
  50                 .length         = SZ_4K,
  51                 .type           = MT_DEVICE
  52         },
  53 };
  54
  55 /* This will create static memory mapping for selected devices */
  56 void __init spear6xx_map_io(void)
  57 {
  58         iotable_init(spear6xx_io_desc, ARRAY_SIZE(spear6xx_io_desc));
  59
  60         /* This will initialize clock framework */
  61         spear6xx_clk_init();
  62 }
  63
  64 static void __init spear6xx_timer_init(void)
  65 {
  66         char pclk_name[] = "pll3_48m_clk";
  67         struct clk *gpt_clk, *pclk;
  68
  69         /* get the system timer clock */
  70         gpt_clk = clk_get_sys("gpt0", NULL);
  71         if (IS_ERR(gpt_clk)) {
  72                 pr_err("%s:couldn't get clk for gpt\n", __func__);
  73                 BUG();
  74         }
  75
  76         /* get the suitable parent clock for timer*/
  77         pclk = clk_get(NULL, pclk_name);
  78         if (IS_ERR(pclk)) {
  79                 pr_err("%s:couldn't get %s as parent for gpt\n",
  80                                 __func__, pclk_name);
  81                 BUG();
  82         }
  83
  84         clk_set_parent(gpt_clk, pclk);
  85         clk_put(gpt_clk);
  86         clk_put(pclk);
  87
  88         spear_setup_timer();
  89 }
  90
  91 struct sys_timer spear6xx_timer = {
  92         .init = spear6xx_timer_init,
  93 };
  94
  95 static void __init spear600_dt_init(void)
  96 {
  97         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
  98 }
  99
 100 static const char *spear600_dt_board_compat[] = {
 101         "st,spear600",
 102         NULL
 103 };
 104
 105 static const struct of_device_id vic_of_match[] __initconst = {
 106         { .compatible = "arm,pl190-vic", .data = vic_of_init, },
 107         { /* Sentinel */ }
 108 };
 109
 110 static void __init spear6xx_dt_init_irq(void)
 111 {
 112         of_irq_init(vic_of_match);
 113 }
 114
 115 DT_MACHINE_START(SPEAR600_DT, "ST SPEAr600 (Flattened Device Tree)")
 116         .map_io         =       spear6xx_map_io,
 117         .init_irq       =       spear6xx_dt_init_irq,
 118         .handle_irq     =       vic_handle_irq,
 119         .timer          =       &spear6xx_timer,
 120         .init_machine   =       spear600_dt_init,
 121         .restart        =       spear_restart,
 122         .dt_compat      =       spear600_dt_board_compat,
 123 MACHINE_END