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 <vireshk@kernel.org>
   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         if (!IS_ENABLED(CONFIG_CACHE_L2X0))
  39                 return;
  40
  41         writel_relaxed(0x06, VA_L2CC_BASE + L310_PREFETCH_CTRL);
  42
  43         /*
  44          * Program following latencies in order to make
  45          * SPEAr1340 work at 600 MHz
  46          */
  47         writel_relaxed(0x221, VA_L2CC_BASE + L310_TAG_LATENCY_CTRL);
  48         writel_relaxed(0x441, VA_L2CC_BASE + L310_DATA_LATENCY_CTRL);
  49         l2x0_init(VA_L2CC_BASE, 0x30a00001, 0xfe0fffff);
  50 }
  51
  52 /*
  53  * Following will create 16MB static virtual/physical mappings
  54  * PHYSICAL             VIRTUAL
  55  * 0xB3000000           0xF9000000
  56  * 0xE0000000           0xFD000000
  57  * 0xEC000000           0xFC000000
  58  * 0xED000000           0xFB000000
  59  */
  60 static struct map_desc spear13xx_io_desc[] __initdata = {
  61         {
  62                 .virtual        = (unsigned long)VA_PERIP_GRP2_BASE,
  63                 .pfn            = __phys_to_pfn(PERIP_GRP2_BASE),
  64                 .length         = SZ_16M,
  65                 .type           = MT_DEVICE
  66         }, {
  67                 .virtual        = (unsigned long)VA_PERIP_GRP1_BASE,
  68                 .pfn            = __phys_to_pfn(PERIP_GRP1_BASE),
  69                 .length         = SZ_16M,
  70                 .type           = MT_DEVICE
  71         }, {
  72                 .virtual        = (unsigned long)VA_A9SM_AND_MPMC_BASE,
  73                 .pfn            = __phys_to_pfn(A9SM_AND_MPMC_BASE),
  74                 .length         = SZ_16M,
  75                 .type           = MT_DEVICE
  76         }, {
  77                 .virtual        = (unsigned long)VA_L2CC_BASE,
  78                 .pfn            = __phys_to_pfn(L2CC_BASE),
  79                 .length         = SZ_4K,
  80                 .type           = MT_DEVICE
  81         },
  82 };
  83
  84 /* This will create static memory mapping for selected devices */
  85 void __init spear13xx_map_io(void)
  86 {
  87         iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
  88 }
  89
  90 static void __init spear13xx_clk_init(void)
  91 {
  92         if (of_machine_is_compatible("st,spear1310"))
  93                 spear1310_clk_init(VA_MISC_BASE, VA_SPEAR1310_RAS_BASE);
  94         else if (of_machine_is_compatible("st,spear1340"))
  95                 spear1340_clk_init(VA_MISC_BASE);
  96         else
  97                 pr_err("%s: Unknown machine\n", __func__);
  98 }
  99
 100 void __init spear13xx_timer_init(void)
 101 {
 102         char pclk_name[] = "osc_24m_clk";
 103         struct clk *gpt_clk, *pclk;
 104
 105         spear13xx_clk_init();
 106
 107         /* get the system timer clock */
 108         gpt_clk = clk_get_sys("gpt0", NULL);
 109         if (IS_ERR(gpt_clk)) {
 110                 pr_err("%s:couldn't get clk for gpt\n", __func__);
 111                 BUG();
 112         }
 113
 114         /* get the suitable parent clock for timer*/
 115         pclk = clk_get(NULL, pclk_name);
 116         if (IS_ERR(pclk)) {
 117                 pr_err("%s:couldn't get %s as parent for gpt\n", __func__,
 118                                 pclk_name);
 119                 BUG();
 120         }
 121
 122         clk_set_parent(gpt_clk, pclk);
 123         clk_put(gpt_clk);
 124         clk_put(pclk);
 125
 126         spear_setup_of_timer();
 127         clocksource_probe();
 128 }