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 #include "irqs.h"
  31
  32 #include "board-mop500-regulators.h"
  33 #include "board-mop500.h"
  34 #include "db8500-regs.h"
  35 #include "id.h"
  36
  37 struct ab8500_platform_data ab8500_platdata = {
  38         .irq_base       = MOP500_AB8500_IRQ_BASE,
  39         .regulator      = &ab8500_regulator_plat_data,
  40 };
  41
  42 struct prcmu_pdata db8500_prcmu_pdata = {
  43         .ab_platdata    = &ab8500_platdata,
  44         .ab_irq         = IRQ_DB8500_AB8500,
  45         .irq_base       = IRQ_PRCMU_BASE,
  46         .version_offset = DB8500_PRCMU_FW_VERSION_OFFSET,
  47         .legacy_offset  = DB8500_PRCMU_LEGACY_OFFSET,
  48 };
  49
  50 /* minimum static i/o mapping required to boot U8500 platforms */
  51 static struct map_desc u8500_uart_io_desc[] __initdata = {
  52         __IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
  53         __IO_DEV_DESC(U8500_UART2_BASE, SZ_4K),
  54 };
  55 /*  U8500 and U9540 common io_desc */
  56 static struct map_desc u8500_common_io_desc[] __initdata = {
  57         /* SCU base also covers GIC CPU BASE and TWD with its 4K page */
  58         __IO_DEV_DESC(U8500_SCU_BASE, SZ_4K),
  59         __IO_DEV_DESC(U8500_GIC_DIST_BASE, SZ_4K),
  60         __IO_DEV_DESC(U8500_L2CC_BASE, SZ_4K),
  61         __IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K),
  62         __IO_DEV_DESC(U8500_BACKUPRAM0_BASE, SZ_8K),
  63
  64         __IO_DEV_DESC(U8500_CLKRST1_BASE, SZ_4K),
  65         __IO_DEV_DESC(U8500_CLKRST2_BASE, SZ_4K),
  66         __IO_DEV_DESC(U8500_CLKRST3_BASE, SZ_4K),
  67         __IO_DEV_DESC(U8500_CLKRST5_BASE, SZ_4K),
  68         __IO_DEV_DESC(U8500_CLKRST6_BASE, SZ_4K),
  69
  70         __IO_DEV_DESC(U8500_GPIO0_BASE, SZ_4K),
  71         __IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
  72         __IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
  73         __IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
  74 };
  75
  76 /* U8500 IO map specific description */
  77 static struct map_desc u8500_io_desc[] __initdata = {
  78         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
  79         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
  80
  81 };
  82
  83 /* U9540 IO map specific description */
  84 static struct map_desc u9540_io_desc[] __initdata = {
  85         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K + SZ_8K),
  86         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K + SZ_8K),
  87 };
  88
  89 void __init u8500_map_io(void)
  90 {
  91         /*
  92          * Map the UARTs early so that the DEBUG_LL stuff continues to work.
  93          */
  94         iotable_init(u8500_uart_io_desc, ARRAY_SIZE(u8500_uart_io_desc));
  95
  96         ux500_map_io();
  97
  98         iotable_init(u8500_common_io_desc, ARRAY_SIZE(u8500_common_io_desc));
  99
 100         if (cpu_is_ux540_family())
 101                 iotable_init(u9540_io_desc, ARRAY_SIZE(u9540_io_desc));
 102         else
 103                 iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
 104 }
 105
 106 /*
 107  * The PMU IRQ lines of two cores are wired together into a single interrupt.
 108  * Bounce the interrupt to the other core if it's not ours.
 109  */
 110 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
 111 {
 112         irqreturn_t ret = handler(irq, dev);
 113         int other = !smp_processor_id();
 114
 115         if (ret == IRQ_NONE && cpu_online(other))
 116                 irq_set_affinity(irq, cpumask_of(other));
 117
 118         /*
 119          * We should be able to get away with the amount of IRQ_NONEs we give,
 120          * while still having the spurious IRQ detection code kick in if the
 121          * interrupt really starts hitting spuriously.
 122          */
 123         return ret;
 124 }
 125
 126 struct arm_pmu_platdata db8500_pmu_platdata = {
 127         .handle_irq             = db8500_pmu_handler,
 128 };
 129
 130 static const char *db8500_read_soc_id(void)
 131 {
 132         void __iomem *uid = __io_address(U8500_BB_UID_BASE);
 133
 134         /* Throw these device-specific numbers into the entropy pool */
 135         add_device_randomness(uid, 0x14);
 136         return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
 137                          readl((u32 *)uid+0),
 138                          readl((u32 *)uid+1), readl((u32 *)uid+2),
 139                          readl((u32 *)uid+3), readl((u32 *)uid+4));
 140 }
 141
 142 static struct device * __init db8500_soc_device_init(void)
 143 {
 144         const char *soc_id = db8500_read_soc_id();
 145
 146         return ux500_soc_device_init(soc_id);
 147 }
 148
 149 #ifdef CONFIG_MACH_UX500_DT
 150 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 151         /* Requires call-back bindings. */
 152         OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
 153         /* Requires DMA bindings. */
 154         OF_DEV_AUXDATA("arm,pl18x", 0x80126000, "sdi0",  &mop500_sdi0_data),
 155         OF_DEV_AUXDATA("arm,pl18x", 0x80118000, "sdi1",  &mop500_sdi1_data),
 156         OF_DEV_AUXDATA("arm,pl18x", 0x80005000, "sdi2",  &mop500_sdi2_data),
 157         OF_DEV_AUXDATA("arm,pl18x", 0x80114000, "sdi4",  &mop500_sdi4_data),
 158         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80123000,
 159                        "ux500-msp-i2s.0", &msp0_platform_data),
 160         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80124000,
 161                        "ux500-msp-i2s.1", &msp1_platform_data),
 162         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80117000,
 163                        "ux500-msp-i2s.2", &msp2_platform_data),
 164         OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
 165                        "ux500-msp-i2s.3", &msp3_platform_data),
 166         /* Requires non-DT:able platform data. */
 167         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 168                         &db8500_prcmu_pdata),
 169         OF_DEV_AUXDATA("stericsson,ux500-cryp", 0xa03cb000, "cryp1", NULL),
 170         OF_DEV_AUXDATA("stericsson,ux500-hash", 0xa03c2000, "hash1", NULL),
 171         OF_DEV_AUXDATA("stericsson,snd-soc-mop500", 0, "snd-soc-mop500.0",
 172                         NULL),
 173         {},
 174 };
 175
 176 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
 177         OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu",
 178                         &db8500_prcmu_pdata),
 179         {},
 180 };
 181
 182 static const struct of_device_id u8500_local_bus_nodes[] = {
 183         /* only create devices below soc node */
 184         { .compatible = "stericsson,db8500", },
 185         { .compatible = "stericsson,db8500-prcmu", },
 186         { .compatible = "simple-bus"},
 187         { },
 188 };
 189
 190 static void __init u8500_init_machine(void)
 191 {
 192         struct device *parent = db8500_soc_device_init();
 193
 194         /* Pinmaps must be in place before devices register */
 195         if (of_machine_is_compatible("st-ericsson,mop500"))
 196                 mop500_pinmaps_init();
 197         else if (of_machine_is_compatible("calaosystems,snowball-a9500")) {
 198                 snowball_pinmaps_init();
 199         } else if (of_machine_is_compatible("st-ericsson,hrefv60+"))
 200                 hrefv60_pinmaps_init();
 201         else if (of_machine_is_compatible("st-ericsson,ccu9540")) {}
 202                 /* TODO: Add pinmaps for ccu9540 board. */
 203
 204         /* automatically probe child nodes of dbx5x0 devices */
 205         if (of_machine_is_compatible("st-ericsson,u8540"))
 206                 of_platform_populate(NULL, u8500_local_bus_nodes,
 207                                      u8540_auxdata_lookup, parent);
 208         else
 209                 of_platform_populate(NULL, u8500_local_bus_nodes,
 210                                      u8500_auxdata_lookup, parent);
 211 }
 212
 213 static const char * stericsson_dt_platform_compat[] = {
 214         "st-ericsson,u8500",
 215         "st-ericsson,u8540",
 216         "st-ericsson,u9500",
 217         "st-ericsson,u9540",
 218         NULL,
 219 };
 220
 221 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
 222         .smp            = smp_ops(ux500_smp_ops),
 223         .map_io         = u8500_map_io,
 224         .init_irq       = ux500_init_irq,
 225         /* we re-use nomadik timer here */
 226         .init_time      = ux500_timer_init,
 227         .init_machine   = u8500_init_machine,
 228         .init_late      = NULL,
 229         .dt_compat      = stericsson_dt_platform_compat,
 230         .restart        = ux500_restart,
 231 MACHINE_END
 232
 233 #endif