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/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
  26void __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 */
  60static 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 */
  85void __init spear13xx_map_io(void)
  86{
  87        iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
  88}
  89
  90static 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
 100void __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        timer_probe();
 128}
 129