arch/arm/mach-spear/spear13xx.c

   1 /*
   2  * arch/arm/mach-spear13xx/spear13xx.c
   3  *
   4  * SPEAr13XX machines common source file
   5  *
   6  * Copyright (C) 2012 ST Microelectronics
   7  * Viresh Kumar <viresh.linux@gmail.com>
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2. This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 #define pr_fmt(fmt) "SPEAr13xx: " fmt
  15
  16 #include <linux/amba/pl022.h>
  17 #include <linux/clk.h>
  18 #include <linux/clocksource.h>
  19 #include <linux/err.h>
  20 #include <linux/of.h>
  21 #include <asm/hardware/cache-l2x0.h>
  22 #include <asm/mach/map.h>
  23 #include <mach/spear.h>
  24 #include "generic.h"
  25
  26 void __init spear13xx_l2x0_init(void)
  27 {
  28         /*
  29          * 512KB (64KB/way), 8-way associativity, parity supported
  30          *
  31          * FIXME: 9th bit, of Auxillary Controller register must be set
  32          * for some spear13xx devices for stable L2 operation.
  33          *
  34          * Enable Early BRESP, L2 prefetch for Instruction and Data,
  35          * write alloc and 'Full line of zero' options
  36          *
  37          */
  38
  39         writel_relaxed(0x06, VA_L2CC_BASE + L2X0_PREFETCH_CTRL);
  40
  41         /*
  42          * Program following latencies in order to make
  43          * SPEAr1340 work at 600 MHz
  44          */
  45         writel_relaxed(0x221, VA_L2CC_BASE + L2X0_TAG_LATENCY_CTRL);
  46         writel_relaxed(0x441, VA_L2CC_BASE + L2X0_DATA_LATENCY_CTRL);
  47         l2x0_init(VA_L2CC_BASE, 0x70A60001, 0xfe00ffff);
  48 }
  49
  50 /*
  51  * Following will create 16MB static virtual/physical mappings
  52  * PHYSICAL             VIRTUAL
  53  * 0xB3000000           0xFE000000
  54  * 0xE0000000           0xFD000000
  55  * 0xEC000000           0xFC000000
  56  * 0xED000000           0xFB000000
  57  */
  58 struct map_desc spear13xx_io_desc[] __initdata = {
  59         {
  60                 .virtual        = (unsigned long)VA_PERIP_GRP2_BASE,
  61                 .pfn            = __phys_to_pfn(PERIP_GRP2_BASE),
  62                 .length         = SZ_16M,
  63                 .type           = MT_DEVICE
  64         }, {
  65                 .virtual        = (unsigned long)VA_PERIP_GRP1_BASE,
  66                 .pfn            = __phys_to_pfn(PERIP_GRP1_BASE),
  67                 .length         = SZ_16M,
  68                 .type           = MT_DEVICE
  69         }, {
  70                 .virtual        = (unsigned long)VA_A9SM_AND_MPMC_BASE,
  71                 .pfn            = __phys_to_pfn(A9SM_AND_MPMC_BASE),
  72                 .length         = SZ_16M,
  73                 .type           = MT_DEVICE
  74         }, {
  75                 .virtual        = (unsigned long)VA_L2CC_BASE,
  76                 .pfn            = __phys_to_pfn(L2CC_BASE),
  77                 .length         = SZ_4K,
  78                 .type           = MT_DEVICE
  79         },
  80 };
  81
  82 /* This will create static memory mapping for selected devices */
  83 void __init spear13xx_map_io(void)
  84 {
  85         iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
  86 }
  87
  88 static void __init spear13xx_clk_init(void)
  89 {
  90         if (of_machine_is_compatible("st,spear1310"))
  91                 spear1310_clk_init(VA_MISC_BASE, VA_SPEAR1310_RAS_BASE);
  92         else if (of_machine_is_compatible("st,spear1340"))
  93                 spear1340_clk_init(VA_MISC_BASE);
  94         else
  95                 pr_err("%s: Unknown machine\n", __func__);
  96 }
  97
  98 void __init spear13xx_timer_init(void)
  99 {
 100         char pclk_name[] = "osc_24m_clk";
 101         struct clk *gpt_clk, *pclk;
 102
 103         spear13xx_clk_init();
 104
 105         /* get the system timer clock */
 106         gpt_clk = clk_get_sys("gpt0", NULL);
 107         if (IS_ERR(gpt_clk)) {
 108                 pr_err("%s:couldn't get clk for gpt\n", __func__);
 109                 BUG();
 110         }
 111
 112         /* get the suitable parent clock for timer*/
 113         pclk = clk_get(NULL, pclk_name);
 114         if (IS_ERR(pclk)) {
 115                 pr_err("%s:couldn't get %s as parent for gpt\n", __func__,
 116                                 pclk_name);
 117                 BUG();
 118         }
 119
 120         clk_set_parent(gpt_clk, pclk);
 121         clk_put(gpt_clk);
 122         clk_put(pclk);
 123
 124         spear_setup_of_timer();
 125         clocksource_of_init();
 126 }