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/clk/spear.h>
  19 #include <linux/clocksource.h>
  20 #include <linux/err.h>
  21 #include <linux/of.h>
  22 #include <asm/hardware/cache-l2x0.h>
  23 #include <asm/mach/map.h>
  24 #include "spear.h"
  25 #include "generic.h"
  26
  27 void __init spear13xx_l2x0_init(void)
  28 {
  29         /*
  30          * 512KB (64KB/way), 8-way associativity, parity supported
  31          *
  32          * FIXME: 9th bit, of Auxiliary Controller register must be set
  33          * for some spear13xx devices for stable L2 operation.
  34          *
  35          * Enable Early BRESP, L2 prefetch for Instruction and Data,
  36          * write alloc and 'Full line of zero' options
  37          *
  38          */
  39         if (!IS_ENABLED(CONFIG_CACHE_L2X0))
  40                 return;
  41
  42         writel_relaxed(0x06, VA_L2CC_BASE + L310_PREFETCH_CTRL);
  43
  44         /*
  45          * Program following latencies in order to make
  46          * SPEAr1340 work at 600 MHz
  47          */
  48         writel_relaxed(0x221, VA_L2CC_BASE + L310_TAG_LATENCY_CTRL);
  49         writel_relaxed(0x441, VA_L2CC_BASE + L310_DATA_LATENCY_CTRL);
  50         l2x0_init(VA_L2CC_BASE, 0x30a00001, 0xfe0fffff);
  51 }
  52
  53 /*
  54  * Following will create 16MB static virtual/physical mappings
  55  * PHYSICAL             VIRTUAL
  56  * 0xB3000000           0xF9000000
  57  * 0xE0000000           0xFD000000
  58  * 0xEC000000           0xFC000000
  59  * 0xED000000           0xFB000000
  60  */
  61 static struct map_desc spear13xx_io_desc[] __initdata = {
  62         {
  63                 .virtual        = (unsigned long)VA_PERIP_GRP2_BASE,
  64                 .pfn            = __phys_to_pfn(PERIP_GRP2_BASE),
  65                 .length         = SZ_16M,
  66                 .type           = MT_DEVICE
  67         }, {
  68                 .virtual        = (unsigned long)VA_PERIP_GRP1_BASE,
  69                 .pfn            = __phys_to_pfn(PERIP_GRP1_BASE),
  70                 .length         = SZ_16M,
  71                 .type           = MT_DEVICE
  72         }, {
  73                 .virtual        = (unsigned long)VA_A9SM_AND_MPMC_BASE,
  74                 .pfn            = __phys_to_pfn(A9SM_AND_MPMC_BASE),
  75                 .length         = SZ_16M,
  76                 .type           = MT_DEVICE
  77         }, {
  78                 .virtual        = (unsigned long)VA_L2CC_BASE,
  79                 .pfn            = __phys_to_pfn(L2CC_BASE),
  80                 .length         = SZ_4K,
  81                 .type           = MT_DEVICE
  82         },
  83 };
  84
  85 /* This will create static memory mapping for selected devices */
  86 void __init spear13xx_map_io(void)
  87 {
  88         iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
  89 }
  90
  91 static void __init spear13xx_clk_init(void)
  92 {
  93         if (of_machine_is_compatible("st,spear1310"))
  94                 spear1310_clk_init(VA_MISC_BASE, VA_SPEAR1310_RAS_BASE);
  95         else if (of_machine_is_compatible("st,spear1340"))
  96                 spear1340_clk_init(VA_MISC_BASE);
  97         else
  98                 pr_err("%s: Unknown machine\n", __func__);
  99 }
 100
 101 void __init spear13xx_timer_init(void)
 102 {
 103         char pclk_name[] = "osc_24m_clk";
 104         struct clk *gpt_clk, *pclk;
 105
 106         spear13xx_clk_init();
 107
 108         /* get the system timer clock */
 109         gpt_clk = clk_get_sys("gpt0", NULL);
 110         if (IS_ERR(gpt_clk)) {
 111                 pr_err("%s:couldn't get clk for gpt\n", __func__);
 112                 BUG();
 113         }
 114
 115         /* get the suitable parent clock for timer*/
 116         pclk = clk_get(NULL, pclk_name);
 117         if (IS_ERR(pclk)) {
 118                 pr_err("%s:couldn't get %s as parent for gpt\n", __func__,
 119                                 pclk_name);
 120                 BUG();
 121         }
 122
 123         clk_set_parent(gpt_clk, pclk);
 124         clk_put(gpt_clk);
 125         clk_put(pclk);
 126
 127         spear_setup_of_timer();
 128         timer_probe();
 129 }