kernel/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 /* minimum static i/o mapping required to boot U8500 platforms */
  47 static struct map_desc u8500_uart_io_desc[] __initdata = {
  48         __IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
  49         __IO_DEV_DESC(U8500_UART2_BASE, SZ_4K),
  50 };
  51 /*  U8500 and U9540 common io_desc */
  52 static struct map_desc u8500_common_io_desc[] __initdata = {
  53         /* SCU base also covers GIC CPU BASE and TWD with its 4K page */
  54         __IO_DEV_DESC(U8500_SCU_BASE, SZ_4K),
  55         __IO_DEV_DESC(U8500_GIC_DIST_BASE, SZ_4K),
  56         __IO_DEV_DESC(U8500_L2CC_BASE, SZ_4K),
  57         __IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K),
  58         __IO_DEV_DESC(U8500_BACKUPRAM0_BASE, SZ_8K),
  59
  60         __IO_DEV_DESC(U8500_CLKRST1_BASE, SZ_4K),
  61         __IO_DEV_DESC(U8500_CLKRST2_BASE, SZ_4K),
  62         __IO_DEV_DESC(U8500_CLKRST3_BASE, SZ_4K),
  63         __IO_DEV_DESC(U8500_CLKRST5_BASE, SZ_4K),
  64         __IO_DEV_DESC(U8500_CLKRST6_BASE, SZ_4K),
  65
  66         __IO_DEV_DESC(U8500_GPIO0_BASE, SZ_4K),
  67         __IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
  68         __IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
  69         __IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
  70 };
  71
  72 /* U8500 IO map specific description */
  73 static struct map_desc u8500_io_desc[] __initdata = {
  74         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
  75         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
  76
  77 };
  78
  79 /* U9540 IO map specific description */
  80 static struct map_desc u9540_io_desc[] __initdata = {
  81         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K + SZ_8K),
  82         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K + SZ_8K),
  83 };
  84
  85 static void __init u8500_map_io(void)
  86 {
  87         /*
  88          * Map the UARTs early so that the DEBUG_LL stuff continues to work.
  89          */
  90         iotable_init(u8500_uart_io_desc, ARRAY_SIZE(u8500_uart_io_desc));
  91
  92         ux500_map_io();
  93
  94         iotable_init(u8500_common_io_desc, ARRAY_SIZE(u8500_common_io_desc));
  95
  96         if (cpu_is_ux540_family())
  97                 iotable_init(u9540_io_desc, ARRAY_SIZE(u9540_io_desc));
  98         else
  99                 iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
 100 }
 101
 102 /*
 103  * The PMU IRQ lines of two cores are wired together into a single interrupt.
 104  * Bounce the interrupt to the other core if it's not ours.
 105  */
 106 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
 107 {
 108         irqreturn_t ret = handler(irq, dev);
 109         int other = !smp_processor_id();
 110
 111         if (ret == IRQ_NONE && cpu_online(other))
 112                 irq_set_affinity(irq, cpumask_of(other));
 113
 114         /*
 115          * We should be able to get away with the amount of IRQ_NONEs we give,
 116          * while still having the spurious IRQ detection code kick in if the
 117          * interrupt really starts hitting spuriously.
 118          */
 119         return ret;
 120 }
 121
 122 static struct arm_pmu_platdata db8500_pmu_platdata = {
 123         .handle_irq             = db8500_pmu_handler,
 124 };
 125
 126 static const char *db8500_read_soc_id(void)
 127 {
 128         void __iomem *uid = __io_address(U8500_BB_UID_BASE);
 129
 130         /* Throw these device-specific numbers into the entropy pool */
 131         add_device_randomness(uid, 0x14);
 132         return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
 133                          readl((u32 *)uid+0),
 134                          readl((u32 *)uid+1), readl((u32 *)uid+2),
 135                          readl((u32 *)uid+3), readl((u32 *)uid+4));
 136 }
 137
 138 static struct device * __init db8500_soc_device_init(void)
 139 {
 140         const char *soc_id = db8500_read_soc_id();
 141
 142         return ux500_soc_device_init(soc_id);
 143 }
 144
 145 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 146         /* Requires call-back bindings. */
 147         OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
 148         /* Requires DMA bindings. */
 149         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000,
 150                        "ux500-msp-i2s.0", &msp0_platform_data),
 151         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000,
 152                        "ux500-msp-i2s.1", &msp1_platform_data),
 153         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000,
 154                        "ux500-msp-i2s.2", &msp2_platform_data),
 155         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
 156                        "ux500-msp-i2s.3", &msp3_platform_data),
 157         /* Requires non-DT:able platform data. */
 158         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 159                         &db8500_prcmu_pdata),
 160         OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL),
 161         OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL),
 162         OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0",
 163                         NULL),
 164         {},
 165 };
 166
 167 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
 168         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 169                         &db8500_prcmu_pdata),
 170         {},
 171 };
 172
 173 static const struct of_device_id u8500_local_bus_nodes[] = {
 174         /* only create devices below soc node */
 175         { .compatible = "stericsson,db8500", },
 176         { .compatible = "stericsson,db8500-prcmu", },
 177         { .compatible = "simple-bus"},
 178         { },
 179 };
 180
 181 static void __init u8500_init_machine(void)
 182 {
 183         struct device *parent = db8500_soc_device_init();
 184
 185         /* automatically probe child nodes of dbx5x0 devices */
 186         if (of_machine_is_compatible("st-ericsson,u8540"))
 187                 of_platform_populate(NULL, u8500_local_bus_nodes,
 188                                      u8540_auxdata_lookup, parent);
 189         else
 190                 of_platform_populate(NULL, u8500_local_bus_nodes,
 191                                      u8500_auxdata_lookup, parent);
 192 }
 193
 194 static const char * stericsson_dt_platform_compat[] = {
 195         "st-ericsson,u8500",
 196         "st-ericsson,u8540",
 197         "st-ericsson,u9500",
 198         "st-ericsson,u9540",
 199         NULL,
 200 };
 201
 202 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
 203         .smp            = smp_ops(ux500_smp_ops),
 204         .map_io         = u8500_map_io,
 205         .init_irq       = ux500_init_irq,
 206         /* we re-use nomadik timer here */
 207         .init_time      = ux500_timer_init,
 208         .init_machine   = u8500_init_machine,
 209         .init_late      = NULL,
 210         .dt_compat      = stericsson_dt_platform_compat,
 211         .restart        = ux500_restart,
 212 MACHINE_END