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/platform_data/pinctrl-nomadik.h>
  25 #include <linux/random.h>
  26
  27 #include <asm/pmu.h>
  28 #include <asm/mach/map.h>
  29
  30 #include "setup.h"
  31 #include "devices.h"
  32 #include "irqs.h"
  33
  34 #include "devices-db8500.h"
  35 #include "db8500-regs.h"
  36 #include "board-mop500.h"
  37 #include "id.h"
  38
  39 /* minimum static i/o mapping required to boot U8500 platforms */
  40 static struct map_desc u8500_uart_io_desc[] __initdata = {
  41         __IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
  42         __IO_DEV_DESC(U8500_UART2_BASE, SZ_4K),
  43 };
  44 /*  U8500 and U9540 common io_desc */
  45 static struct map_desc u8500_common_io_desc[] __initdata = {
  46         /* SCU base also covers GIC CPU BASE and TWD with its 4K page */
  47         __IO_DEV_DESC(U8500_SCU_BASE, SZ_4K),
  48         __IO_DEV_DESC(U8500_GIC_DIST_BASE, SZ_4K),
  49         __IO_DEV_DESC(U8500_L2CC_BASE, SZ_4K),
  50         __IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K),
  51         __IO_DEV_DESC(U8500_BACKUPRAM0_BASE, SZ_8K),
  52
  53         __IO_DEV_DESC(U8500_CLKRST1_BASE, SZ_4K),
  54         __IO_DEV_DESC(U8500_CLKRST2_BASE, SZ_4K),
  55         __IO_DEV_DESC(U8500_CLKRST3_BASE, SZ_4K),
  56         __IO_DEV_DESC(U8500_CLKRST5_BASE, SZ_4K),
  57         __IO_DEV_DESC(U8500_CLKRST6_BASE, SZ_4K),
  58
  59         __IO_DEV_DESC(U8500_GPIO0_BASE, SZ_4K),
  60         __IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
  61         __IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
  62         __IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
  63 };
  64
  65 /* U8500 IO map specific description */
  66 static struct map_desc u8500_io_desc[] __initdata = {
  67         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
  68         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
  69
  70 };
  71
  72 /* U9540 IO map specific description */
  73 static struct map_desc u9540_io_desc[] __initdata = {
  74         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K + SZ_8K),
  75         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K + SZ_8K),
  76 };
  77
  78 void __init u8500_map_io(void)
  79 {
  80         /*
  81          * Map the UARTs early so that the DEBUG_LL stuff continues to work.
  82          */
  83         iotable_init(u8500_uart_io_desc, ARRAY_SIZE(u8500_uart_io_desc));
  84
  85         ux500_map_io();
  86
  87         iotable_init(u8500_common_io_desc, ARRAY_SIZE(u8500_common_io_desc));
  88
  89         if (cpu_is_ux540_family())
  90                 iotable_init(u9540_io_desc, ARRAY_SIZE(u9540_io_desc));
  91         else
  92                 iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
  93 }
  94
  95 /*
  96  * The PMU IRQ lines of two cores are wired together into a single interrupt.
  97  * Bounce the interrupt to the other core if it's not ours.
  98  */
  99 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
 100 {
 101         irqreturn_t ret = handler(irq, dev);
 102         int other = !smp_processor_id();
 103
 104         if (ret == IRQ_NONE && cpu_online(other))
 105                 irq_set_affinity(irq, cpumask_of(other));
 106
 107         /*
 108          * We should be able to get away with the amount of IRQ_NONEs we give,
 109          * while still having the spurious IRQ detection code kick in if the
 110          * interrupt really starts hitting spuriously.
 111          */
 112         return ret;
 113 }
 114
 115 struct arm_pmu_platdata db8500_pmu_platdata = {
 116         .handle_irq             = db8500_pmu_handler,
 117 };
 118
 119 static const char *db8500_read_soc_id(void)
 120 {
 121         void __iomem *uid = __io_address(U8500_BB_UID_BASE);
 122
 123         /* Throw these device-specific numbers into the entropy pool */
 124         add_device_randomness(uid, 0x14);
 125         return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
 126                          readl((u32 *)uid+0),
 127                          readl((u32 *)uid+1), readl((u32 *)uid+2),
 128                          readl((u32 *)uid+3), readl((u32 *)uid+4));
 129 }
 130
 131 static struct device * __init db8500_soc_device_init(void)
 132 {
 133         const char *soc_id = db8500_read_soc_id();
 134
 135         return ux500_soc_device_init(soc_id);
 136 }
 137
 138 #ifdef CONFIG_MACH_UX500_DT
 139 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 140         /* Requires call-back bindings. */
 141         OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
 142         /* Requires DMA bindings. */
 143         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000,
 144                        "ux500-msp-i2s.0", &msp0_platform_data),
 145         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000,
 146                        "ux500-msp-i2s.1", &msp1_platform_data),
 147         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000,
 148                        "ux500-msp-i2s.2", &msp2_platform_data),
 149         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
 150                        "ux500-msp-i2s.3", &msp3_platform_data),
 151         /* Requires non-DT:able platform data. */
 152         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 153                         &db8500_prcmu_pdata),
 154         OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL),
 155         OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL),
 156         OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0",
 157                         NULL),
 158         /* Requires device name bindings. */
 159         OF_DEV_AUXDATA("stericsson,db8500-pinctrl", U8500_PRCMU_BASE,
 160                 "pinctrl-db8500", NULL),
 161         {},
 162 };
 163
 164 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
 165         /* Requires DMA bindings. */
 166         OF_DEV_AUXDATA("arm,pl011", 0x80120000, "uart0", NULL),
 167         OF_DEV_AUXDATA("arm,pl011", 0x80121000, "uart1", NULL),
 168         OF_DEV_AUXDATA("arm,pl011", 0x80007000, "uart2", NULL),
 169         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 170                         &db8500_prcmu_pdata),
 171         {},
 172 };
 173
 174 static const struct of_device_id u8500_local_bus_nodes[] = {
 175         /* only create devices below soc node */
 176         { .compatible = "stericsson,db8500", },
 177         { .compatible = "stericsson,db8500-prcmu", },
 178         { .compatible = "simple-bus"},
 179         { },
 180 };
 181
 182 static void __init u8500_init_machine(void)
 183 {
 184         struct device *parent = db8500_soc_device_init();
 185
 186         /* Pinmaps must be in place before devices register */
 187         if (of_machine_is_compatible("st-ericsson,mop500"))
 188                 mop500_pinmaps_init();
 189         else if (of_machine_is_compatible("calaosystems,snowball-a9500")) {
 190                 snowball_pinmaps_init();
 191         } else if (of_machine_is_compatible("st-ericsson,hrefv60+"))
 192                 hrefv60_pinmaps_init();
 193         else if (of_machine_is_compatible("st-ericsson,ccu9540")) {}
 194                 /* TODO: Add pinmaps for ccu9540 board. */
 195
 196         /* automatically probe child nodes of dbx5x0 devices */
 197         if (of_machine_is_compatible("st-ericsson,u8540"))
 198                 of_platform_populate(NULL, u8500_local_bus_nodes,
 199                                      u8540_auxdata_lookup, parent);
 200         else
 201                 of_platform_populate(NULL, u8500_local_bus_nodes,
 202                                      u8500_auxdata_lookup, parent);
 203 }
 204
 205 static const char * stericsson_dt_platform_compat[] = {
 206         "st-ericsson,u8500",
 207         "st-ericsson,u8540",
 208         "st-ericsson,u9500",
 209         "st-ericsson,u9540",
 210         NULL,
 211 };
 212
 213 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
 214         .smp            = smp_ops(ux500_smp_ops),
 215         .map_io         = u8500_map_io,
 216         .init_irq       = ux500_init_irq,
 217         /* we re-use nomadik timer here */
 218         .init_time      = ux500_timer_init,
 219         .init_machine   = u8500_init_machine,
 220         .init_late      = NULL,
 221         .dt_compat      = stericsson_dt_platform_compat,
 222         .restart        = ux500_restart,
 223 MACHINE_END
 224
 225 #endif