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/regulator/machine.h>
  24 #include <linux/random.h>
  25
  26 #include <asm/pmu.h>
  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 /*  U8500 and U9540 common io_desc */
  47 static struct map_desc u8500_common_io_desc[] __initdata = {
  48         /* SCU base also covers GIC CPU BASE and TWD with its 4K page */
  49         __IO_DEV_DESC(U8500_SCU_BASE, SZ_4K),
  50         __IO_DEV_DESC(U8500_L2CC_BASE, SZ_4K),
  51         __IO_DEV_DESC(U8500_BACKUPRAM0_BASE, SZ_8K),
  52 };
  53
  54 /* U8500 IO map specific description */
  55 static struct map_desc u8500_io_desc[] __initdata = {
  56         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
  57         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
  58
  59 };
  60
  61 /* U9540 IO map specific description */
  62 static struct map_desc u9540_io_desc[] __initdata = {
  63         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K + SZ_8K),
  64         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K + SZ_8K),
  65 };
  66
  67 static void __init u8500_map_io(void)
  68 {
  69         debug_ll_io_init();
  70         ux500_map_io();
  71
  72         iotable_init(u8500_common_io_desc, ARRAY_SIZE(u8500_common_io_desc));
  73
  74         if (cpu_is_ux540_family())
  75                 iotable_init(u9540_io_desc, ARRAY_SIZE(u9540_io_desc));
  76         else
  77                 iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
  78 }
  79
  80 /*
  81  * The PMU IRQ lines of two cores are wired together into a single interrupt.
  82  * Bounce the interrupt to the other core if it's not ours.
  83  */
  84 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
  85 {
  86         irqreturn_t ret = handler(irq, dev);
  87         int other = !smp_processor_id();
  88
  89         if (ret == IRQ_NONE && cpu_online(other))
  90                 irq_set_affinity(irq, cpumask_of(other));
  91
  92         /*
  93          * We should be able to get away with the amount of IRQ_NONEs we give,
  94          * while still having the spurious IRQ detection code kick in if the
  95          * interrupt really starts hitting spuriously.
  96          */
  97         return ret;
  98 }
  99
 100 static struct arm_pmu_platdata db8500_pmu_platdata = {
 101         .handle_irq             = db8500_pmu_handler,
 102 };
 103
 104 static const char *db8500_read_soc_id(void)
 105 {
 106         void __iomem *uid;
 107
 108         uid = ioremap(U8500_BB_UID_BASE, 0x20);
 109         if (!uid)
 110                 return NULL;
 111         /* Throw these device-specific numbers into the entropy pool */
 112         add_device_randomness(uid, 0x14);
 113         return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
 114                          readl((u32 *)uid+0),
 115                          readl((u32 *)uid+1), readl((u32 *)uid+2),
 116                          readl((u32 *)uid+3), readl((u32 *)uid+4));
 117         iounmap(uid);
 118 }
 119
 120 static struct device * __init db8500_soc_device_init(void)
 121 {
 122         const char *soc_id = db8500_read_soc_id();
 123
 124         return ux500_soc_device_init(soc_id);
 125 }
 126
 127 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 128         /* Requires call-back bindings. */
 129         OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
 130         /* Requires DMA bindings. */
 131         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000,
 132                        "ux500-msp-i2s.0", &msp0_platform_data),
 133         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000,
 134                        "ux500-msp-i2s.1", &msp1_platform_data),
 135         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000,
 136                        "ux500-msp-i2s.2", &msp2_platform_data),
 137         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
 138                        "ux500-msp-i2s.3", &msp3_platform_data),
 139         /* Requires non-DT:able platform data. */
 140         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 141                         &db8500_prcmu_pdata),
 142         OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL),
 143         OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL),
 144         OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0",
 145                         NULL),
 146         {},
 147 };
 148
 149 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
 150         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 151                         &db8500_prcmu_pdata),
 152         {},
 153 };
 154
 155 static const struct of_device_id u8500_local_bus_nodes[] = {
 156         /* only create devices below soc node */
 157         { .compatible = "stericsson,db8500", },
 158         { .compatible = "stericsson,db8500-prcmu", },
 159         { .compatible = "simple-bus"},
 160         { },
 161 };
 162
 163 static void __init u8500_init_machine(void)
 164 {
 165         struct device *parent = db8500_soc_device_init();
 166
 167         /* automatically probe child nodes of dbx5x0 devices */
 168         if (of_machine_is_compatible("st-ericsson,u8540"))
 169                 of_platform_populate(NULL, u8500_local_bus_nodes,
 170                                      u8540_auxdata_lookup, parent);
 171         else
 172                 of_platform_populate(NULL, u8500_local_bus_nodes,
 173                                      u8500_auxdata_lookup, parent);
 174 }
 175
 176 static const char * stericsson_dt_platform_compat[] = {
 177         "st-ericsson,u8500",
 178         "st-ericsson,u8540",
 179         "st-ericsson,u9500",
 180         "st-ericsson,u9540",
 181         NULL,
 182 };
 183
 184 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
 185         .smp            = smp_ops(ux500_smp_ops),
 186         .map_io         = u8500_map_io,
 187         .init_irq       = ux500_init_irq,
 188         /* we re-use nomadik timer here */
 189         .init_time      = ux500_timer_init,
 190         .init_machine   = u8500_init_machine,
 191         .init_late      = NULL,
 192         .dt_compat      = stericsson_dt_platform_compat,
 193         .restart        = ux500_restart,
 194 MACHINE_END