LXR linux/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 <mach/spear.h>
  25#include "generic.h"
  26
  27void __init spear13xx_l2x0_init(void)
  28{
  29        /*
  30         * 512KB (64KB/way), 8-way associativity, parity supported
  31         *
  32         * FIXME: 9th bit, of Auxillary 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 */
  61static 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 */
  86void __init spear13xx_map_io(void)
  87{
  88        iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
  89}
  90
  91static 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
 101void __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}
 130