LXR linux/arch/arm/mach-ux500/cpu-db8500.c

   1/*
   2 * Copyright (C) 2008-2009 ST-Ericsson SA
   3 *
   4 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2, as
   8 * published by the Free Software Foundation.
   9 *
  10 */
  11#include <linux/types.h>
  12#include <linux/init.h>
  13#include <linux/device.h>
  14#include <linux/amba/bus.h>
  15#include <linux/interrupt.h>
  16#include <linux/irq.h>
  17#include <linux/platform_device.h>
  18#include <linux/io.h>
  19#include <linux/mfd/abx500/ab8500.h>
  20#include <linux/mfd/dbx500-prcmu.h>
  21#include <linux/of.h>
  22#include <linux/of_platform.h>
  23#include <linux/perf/arm_pmu.h>
  24#include <linux/regulator/machine.h>
  25#include <linux/random.h>
  26
  27#include <asm/mach/map.h>
  28
  29#include "setup.h"
  30
  31#include "board-mop500-regulators.h"
  32#include "board-mop500.h"
  33#include "db8500-regs.h"
  34#include "id.h"
  35
  36static struct ab8500_platform_data ab8500_platdata = {
  37        .regulator      = &ab8500_regulator_plat_data,
  38};
  39
  40static struct prcmu_pdata db8500_prcmu_pdata = {
  41        .ab_platdata    = &ab8500_platdata,
  42        .version_offset = DB8500_PRCMU_FW_VERSION_OFFSET,
  43        .legacy_offset  = DB8500_PRCMU_LEGACY_OFFSET,
  44};
  45
  46static void __init u8500_map_io(void)
  47{
  48        debug_ll_io_init();
  49        ux500_setup_id();
  50}
  51
  52/*
  53 * The PMU IRQ lines of two cores are wired together into a single interrupt.
  54 * Bounce the interrupt to the other core if it's not ours.
  55 */
  56static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
  57{
  58        irqreturn_t ret = handler(irq, dev);
  59        int other = !smp_processor_id();
  60
  61        if (ret == IRQ_NONE && cpu_online(other))
  62                irq_set_affinity(irq, cpumask_of(other));
  63
  64        /*
  65         * We should be able to get away with the amount of IRQ_NONEs we give,
  66         * while still having the spurious IRQ detection code kick in if the
  67         * interrupt really starts hitting spuriously.
  68         */
  69        return ret;
  70}
  71
  72static struct arm_pmu_platdata db8500_pmu_platdata = {
  73        .handle_irq             = db8500_pmu_handler,
  74};
  75
  76static const char *db8500_read_soc_id(void)
  77{
  78        void __iomem *uid;
  79        const char *retstr;
  80
  81        uid = ioremap(U8500_BB_UID_BASE, 0x20);
  82        if (!uid)
  83                return NULL;
  84        /* Throw these device-specific numbers into the entropy pool */
  85        add_device_randomness(uid, 0x14);
  86        retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
  87                         readl((u32 *)uid+0),
  88                         readl((u32 *)uid+1), readl((u32 *)uid+2),
  89                         readl((u32 *)uid+3), readl((u32 *)uid+4));
  90        iounmap(uid);
  91        return retstr;
  92}
  93
  94static struct device * __init db8500_soc_device_init(void)
  95{
  96        const char *soc_id = db8500_read_soc_id();
  97
  98        return ux500_soc_device_init(soc_id);
  99}
 100
 101static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 102        /* Requires call-back bindings. */
 103        OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
 104        /* Requires DMA bindings. */
 105        OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000,
 106                       "ux500-msp-i2s.0", &msp0_platform_data),
 107        OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000,
 108                       "ux500-msp-i2s.1", &msp1_platform_data),
 109        OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000,
 110                       "ux500-msp-i2s.2", &msp2_platform_data),
 111        OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
 112                       "ux500-msp-i2s.3", &msp3_platform_data),
 113        /* Requires non-DT:able platform data. */
 114        OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 115                        &db8500_prcmu_pdata),
 116        OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL),
 117        OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL),
 118        OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0",
 119                        NULL),
 120        {},
 121};
 122
 123static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
 124        OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 125                        &db8500_prcmu_pdata),
 126        {},
 127};
 128
 129static const struct of_device_id u8500_local_bus_nodes[] = {
 130        /* only create devices below soc node */
 131        { .compatible = "stericsson,db8500", },
 132        { .compatible = "stericsson,db8500-prcmu", },
 133        { .compatible = "simple-bus"},
 134        { },
 135};
 136
 137static void __init u8500_init_machine(void)
 138{
 139        struct device *parent = db8500_soc_device_init();
 140
 141        /* automatically probe child nodes of dbx5x0 devices */
 142        if (of_machine_is_compatible("st-ericsson,u8540"))
 143                of_platform_populate(NULL, u8500_local_bus_nodes,
 144                                     u8540_auxdata_lookup, parent);
 145        else
 146                of_platform_populate(NULL, u8500_local_bus_nodes,
 147                                     u8500_auxdata_lookup, parent);
 148}
 149
 150static const char * stericsson_dt_platform_compat[] = {
 151        "st-ericsson,u8500",
 152        "st-ericsson,u8540",
 153        "st-ericsson,u9500",
 154        "st-ericsson,u9540",
 155        NULL,
 156};
 157
 158DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
 159        .map_io         = u8500_map_io,
 160        .init_irq       = ux500_init_irq,
 161        .init_machine   = u8500_init_machine,
 162        .init_late      = NULL,
 163        .dt_compat      = stericsson_dt_platform_compat,
 164        .restart        = ux500_restart,
 165MACHINE_END
 166