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
  21 #include <asm/pmu.h>
  22 #include <asm/mach/map.h>
  23 #include <plat/gpio-nomadik.h>
  24 #include <mach/hardware.h>
  25 #include <mach/setup.h>
  26 #include <mach/devices.h>
  27 #include <mach/usb.h>
  28 #include <mach/db8500-regs.h>
  29
  30 #include "devices-db8500.h"
  31 #include "ste-dma40-db8500.h"
  32
  33 /* minimum static i/o mapping required to boot U8500 platforms */
  34 static struct map_desc u8500_uart_io_desc[] __initdata = {
  35         __IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
  36         __IO_DEV_DESC(U8500_UART2_BASE, SZ_4K),
  37 };
  38 /*  U8500 and U9540 common io_desc */
  39 static struct map_desc u8500_common_io_desc[] __initdata = {
  40         /* SCU base also covers GIC CPU BASE and TWD with its 4K page */
  41         __IO_DEV_DESC(U8500_SCU_BASE, SZ_4K),
  42         __IO_DEV_DESC(U8500_GIC_DIST_BASE, SZ_4K),
  43         __IO_DEV_DESC(U8500_L2CC_BASE, SZ_4K),
  44         __IO_DEV_DESC(U8500_MTU0_BASE, SZ_4K),
  45         __IO_DEV_DESC(U8500_BACKUPRAM0_BASE, SZ_8K),
  46
  47         __IO_DEV_DESC(U8500_CLKRST1_BASE, SZ_4K),
  48         __IO_DEV_DESC(U8500_CLKRST2_BASE, SZ_4K),
  49         __IO_DEV_DESC(U8500_CLKRST3_BASE, SZ_4K),
  50         __IO_DEV_DESC(U8500_CLKRST5_BASE, SZ_4K),
  51         __IO_DEV_DESC(U8500_CLKRST6_BASE, SZ_4K),
  52
  53         __IO_DEV_DESC(U8500_GPIO0_BASE, SZ_4K),
  54         __IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
  55         __IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
  56         __IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
  57 };
  58
  59 /* U8500 IO map specific description */
  60 static struct map_desc u8500_io_desc[] __initdata = {
  61         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K),
  62         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
  63
  64 };
  65
  66 /* U9540 IO map specific description */
  67 static struct map_desc u9540_io_desc[] __initdata = {
  68         __IO_DEV_DESC(U8500_PRCMU_BASE, SZ_4K + SZ_8K),
  69         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K + SZ_8K),
  70 };
  71
  72 void __init u8500_map_io(void)
  73 {
  74         /*
  75          * Map the UARTs early so that the DEBUG_LL stuff continues to work.
  76          */
  77         iotable_init(u8500_uart_io_desc, ARRAY_SIZE(u8500_uart_io_desc));
  78
  79         ux500_map_io();
  80
  81         iotable_init(u8500_common_io_desc, ARRAY_SIZE(u8500_common_io_desc));
  82
  83         if (cpu_is_ux540_family())
  84                 iotable_init(u9540_io_desc, ARRAY_SIZE(u9540_io_desc));
  85         else
  86                 iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
  87
  88         _PRCMU_BASE = __io_address(U8500_PRCMU_BASE);
  89 }
  90
  91 static struct resource db8500_pmu_resources[] = {
  92         [0] = {
  93                 .start          = IRQ_DB8500_PMU,
  94                 .end            = IRQ_DB8500_PMU,
  95                 .flags          = IORESOURCE_IRQ,
  96         },
  97 };
  98
  99 /*
 100  * The PMU IRQ lines of two cores are wired together into a single interrupt.
 101  * Bounce the interrupt to the other core if it's not ours.
 102  */
 103 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
 104 {
 105         irqreturn_t ret = handler(irq, dev);
 106         int other = !smp_processor_id();
 107
 108         if (ret == IRQ_NONE && cpu_online(other))
 109                 irq_set_affinity(irq, cpumask_of(other));
 110
 111         /*
 112          * We should be able to get away with the amount of IRQ_NONEs we give,
 113          * while still having the spurious IRQ detection code kick in if the
 114          * interrupt really starts hitting spuriously.
 115          */
 116         return ret;
 117 }
 118
 119 struct arm_pmu_platdata db8500_pmu_platdata = {
 120         .handle_irq             = db8500_pmu_handler,
 121 };
 122
 123 static struct platform_device db8500_pmu_device = {
 124         .name                   = "arm-pmu",
 125         .id                     = -1,
 126         .num_resources          = ARRAY_SIZE(db8500_pmu_resources),
 127         .resource               = db8500_pmu_resources,
 128         .dev.platform_data      = &db8500_pmu_platdata,
 129 };
 130
 131 static struct platform_device db8500_prcmu_device = {
 132         .name                   = "db8500-prcmu",
 133 };
 134
 135 static struct platform_device *platform_devs[] __initdata = {
 136         &u8500_dma40_device,
 137         &db8500_pmu_device,
 138         &db8500_prcmu_device,
 139 };
 140
 141 static resource_size_t __initdata db8500_gpio_base[] = {
 142         U8500_GPIOBANK0_BASE,
 143         U8500_GPIOBANK1_BASE,
 144         U8500_GPIOBANK2_BASE,
 145         U8500_GPIOBANK3_BASE,
 146         U8500_GPIOBANK4_BASE,
 147         U8500_GPIOBANK5_BASE,
 148         U8500_GPIOBANK6_BASE,
 149         U8500_GPIOBANK7_BASE,
 150         U8500_GPIOBANK8_BASE,
 151 };
 152
 153 static void __init db8500_add_gpios(struct device *parent)
 154 {
 155         struct nmk_gpio_platform_data pdata = {
 156                 .supports_sleepmode = true,
 157         };
 158
 159         dbx500_add_gpios(parent, ARRAY_AND_SIZE(db8500_gpio_base),
 160                          IRQ_DB8500_GPIO0, &pdata);
 161         dbx500_add_pinctrl(parent, "pinctrl-db8500");
 162 }
 163
 164 static int usb_db8500_rx_dma_cfg[] = {
 165         DB8500_DMA_DEV38_USB_OTG_IEP_1_9,
 166         DB8500_DMA_DEV37_USB_OTG_IEP_2_10,
 167         DB8500_DMA_DEV36_USB_OTG_IEP_3_11,
 168         DB8500_DMA_DEV19_USB_OTG_IEP_4_12,
 169         DB8500_DMA_DEV18_USB_OTG_IEP_5_13,
 170         DB8500_DMA_DEV17_USB_OTG_IEP_6_14,
 171         DB8500_DMA_DEV16_USB_OTG_IEP_7_15,
 172         DB8500_DMA_DEV39_USB_OTG_IEP_8
 173 };
 174
 175 static int usb_db8500_tx_dma_cfg[] = {
 176         DB8500_DMA_DEV38_USB_OTG_OEP_1_9,
 177         DB8500_DMA_DEV37_USB_OTG_OEP_2_10,
 178         DB8500_DMA_DEV36_USB_OTG_OEP_3_11,
 179         DB8500_DMA_DEV19_USB_OTG_OEP_4_12,
 180         DB8500_DMA_DEV18_USB_OTG_OEP_5_13,
 181         DB8500_DMA_DEV17_USB_OTG_OEP_6_14,
 182         DB8500_DMA_DEV16_USB_OTG_OEP_7_15,
 183         DB8500_DMA_DEV39_USB_OTG_OEP_8
 184 };
 185
 186 static const char *db8500_read_soc_id(void)
 187 {
 188         void __iomem *uid = __io_address(U8500_BB_UID_BASE);
 189
 190         return kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x",
 191                          readl((u32 *)uid+1),
 192                          readl((u32 *)uid+1), readl((u32 *)uid+2),
 193                          readl((u32 *)uid+3), readl((u32 *)uid+4));
 194 }
 195
 196 static struct device * __init db8500_soc_device_init(void)
 197 {
 198         const char *soc_id = db8500_read_soc_id();
 199
 200         return ux500_soc_device_init(soc_id);
 201 }
 202
 203 /*
 204  * This function is called from the board init
 205  */
 206 struct device * __init u8500_init_devices(struct ab8500_platform_data *ab8500)
 207 {
 208         struct device *parent;
 209         int i;
 210
 211         parent = db8500_soc_device_init();
 212
 213         db8500_add_rtc(parent);
 214         db8500_add_gpios(parent);
 215         db8500_add_usb(parent, usb_db8500_rx_dma_cfg, usb_db8500_tx_dma_cfg);
 216
 217         platform_device_register_data(parent,
 218                 "cpufreq-u8500", -1, NULL, 0);
 219
 220         for (i = 0; i < ARRAY_SIZE(platform_devs); i++)
 221                 platform_devs[i]->dev.parent = parent;
 222
 223         db8500_prcmu_device.dev.platform_data = ab8500;
 224
 225         platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
 226
 227         return parent;
 228 }
 229
 230 /* TODO: Once all pieces are DT:ed, remove completely. */
 231 struct device * __init u8500_of_init_devices(void)
 232 {
 233         struct device *parent;
 234
 235         parent = db8500_soc_device_init();
 236
 237         db8500_add_usb(parent, usb_db8500_rx_dma_cfg, usb_db8500_tx_dma_cfg);
 238
 239         platform_device_register_data(parent,
 240                 "cpufreq-u8500", -1, NULL, 0);
 241
 242         u8500_dma40_device.dev.parent = parent;
 243
 244         /*
 245          * Devices to be DT:ed:
 246          *   u8500_dma40_device  = todo
 247          *   db8500_pmu_device   = done
 248          *   db8500_prcmu_device = done
 249          */
 250         platform_device_register(&u8500_dma40_device);
 251
 252         return parent;
 253 }