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
  24 #include <asm/mach/map.h>
  25
  26 #include "setup.h"
  27
  28 #include "board-mop500.h"
  29 #include "db8500-regs.h"
  30 #include "id.h"
  31
  32 static void __init u8500_map_io(void)
  33 {
  34         debug_ll_io_init();
  35         ux500_setup_id();
  36 }
  37
  38 /*
  39  * The PMU IRQ lines of two cores are wired together into a single interrupt.
  40  * Bounce the interrupt to the other core if it's not ours.
  41  */
  42 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
  43 {
  44         irqreturn_t ret = handler(irq, dev);
  45         int other = !smp_processor_id();
  46
  47         if (ret == IRQ_NONE && cpu_online(other))
  48                 irq_set_affinity(irq, cpumask_of(other));
  49
  50         /*
  51          * We should be able to get away with the amount of IRQ_NONEs we give,
  52          * while still having the spurious IRQ detection code kick in if the
  53          * interrupt really starts hitting spuriously.
  54          */
  55         return ret;
  56 }
  57
  58 static struct arm_pmu_platdata db8500_pmu_platdata = {
  59         .handle_irq             = db8500_pmu_handler,
  60 };
  61
  62 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
  63         /* Requires call-back bindings. */
  64         OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
  65         /* Requires DMA bindings. */
  66         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000,
  67                        "ux500-msp-i2s.0", &msp0_platform_data),
  68         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000,
  69                        "ux500-msp-i2s.1", &msp1_platform_data),
  70         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000,
  71                        "ux500-msp-i2s.2", &msp2_platform_data),
  72         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
  73                        "ux500-msp-i2s.3", &msp3_platform_data),
  74         /* Requires non-DT:able platform data. */
  75         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu", NULL),
  76         OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL),
  77         OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL),
  78         OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0",
  79                         NULL),
  80         {},
  81 };
  82
  83 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
  84         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu", NULL),
  85         {},
  86 };
  87
  88 static const struct of_device_id u8500_local_bus_nodes[] = {
  89         /* only create devices below soc node */
  90         { .compatible = "stericsson,db8500", },
  91         { .compatible = "stericsson,db8500-prcmu", },
  92         { .compatible = "simple-bus"},
  93         { },
  94 };
  95
  96 static void __init u8500_init_machine(void)
  97 {
  98         struct device *parent = ux500_soc_device_init();
  99
 100         /* automatically probe child nodes of dbx5x0 devices */
 101         if (of_machine_is_compatible("st-ericsson,u8540"))
 102                 of_platform_populate(NULL, u8500_local_bus_nodes,
 103                                      u8540_auxdata_lookup, parent);
 104         else
 105                 of_platform_populate(NULL, u8500_local_bus_nodes,
 106                                      u8500_auxdata_lookup, parent);
 107 }
 108
 109 static const char * stericsson_dt_platform_compat[] = {
 110         "st-ericsson,u8500",
 111         "st-ericsson,u8540",
 112         "st-ericsson,u9500",
 113         "st-ericsson,u9540",
 114         NULL,
 115 };
 116
 117 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
 118         .l2c_aux_val    = 0,
 119         .l2c_aux_mask   = ~0,
 120         .map_io         = u8500_map_io,
 121         .init_irq       = ux500_init_irq,
 122         .init_machine   = u8500_init_machine,
 123         .dt_compat      = stericsson_dt_platform_compat,
 124         .restart        = ux500_restart,
 125 MACHINE_END