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
  36 static struct ab8500_platform_data ab8500_platdata = {
  37         .regulator      = &ab8500_regulator_plat_data,
  38 };
  39
  40 static 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
  46 static 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  */
  56 static 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
  72 static struct arm_pmu_platdata db8500_pmu_platdata = {
  73         .handle_irq             = db8500_pmu_handler,
  74 };
  75
  76 static 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
  94 static 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
 101 static 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
 123 static 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
 129 static 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
 137 static 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
 150 static 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
 158 DT_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,
 165 MACHINE_END