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