LXR linux/arch/arm/mach-ux500/cpu.c

   1/*
   2 * Copyright (C) ST-Ericsson SA 2010
   3 *
   4 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
   5 * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson
   6 * License terms: GNU General Public License (GPL) version 2
   7 */
   8
   9#include <linux/platform_device.h>
  10#include <linux/io.h>
  11#include <linux/mfd/db8500-prcmu.h>
  12#include <linux/clksrc-dbx500-prcmu.h>
  13#include <linux/sys_soc.h>
  14#include <linux/err.h>
  15#include <linux/slab.h>
  16#include <linux/stat.h>
  17#include <linux/of.h>
  18#include <linux/of_irq.h>
  19#include <linux/irq.h>
  20#include <linux/platform_data/clk-ux500.h>
  21
  22#include <asm/hardware/gic.h>
  23#include <asm/mach/map.h>
  24
  25#include <mach/hardware.h>
  26#include <mach/setup.h>
  27#include <mach/devices.h>
  28
  29#include "board-mop500.h"
  30
  31void __iomem *_PRCMU_BASE;
  32
  33/*
  34 * FIXME: Should we set up the GPIO domain here?
  35 *
  36 * The problem is that we cannot put the interrupt resources into the platform
  37 * device until the irqdomain has been added. Right now, we set the GIC interrupt
  38 * domain from init_irq(), then load the gpio driver from
  39 * core_initcall(nmk_gpio_init) and add the platform devices from
  40 * arch_initcall(customize_machine).
  41 *
  42 * This feels fragile because it depends on the gpio device getting probed
  43 * _before_ any device uses the gpio interrupts.
  44*/
  45static const struct of_device_id ux500_dt_irq_match[] = {
  46        { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  47        {},
  48};
  49
  50void __init ux500_init_irq(void)
  51{
  52        void __iomem *dist_base;
  53        void __iomem *cpu_base;
  54
  55        gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
  56
  57        if (cpu_is_u8500_family() || cpu_is_ux540_family()) {
  58                dist_base = __io_address(U8500_GIC_DIST_BASE);
  59                cpu_base = __io_address(U8500_GIC_CPU_BASE);
  60        } else
  61                ux500_unknown_soc();
  62
  63#ifdef CONFIG_OF
  64        if (of_have_populated_dt())
  65                of_irq_init(ux500_dt_irq_match);
  66        else
  67#endif
  68                gic_init(0, 29, dist_base, cpu_base);
  69
  70        /*
  71         * Init clocks here so that they are available for system timer
  72         * initialization.
  73         */
  74        if (cpu_is_u8500_family())
  75                db8500_prcmu_early_init();
  76
  77        if (cpu_is_u8500_family())
  78                u8500_clk_init();
  79        else if (cpu_is_u9540())
  80                u9540_clk_init();
  81        else if (cpu_is_u8540())
  82                u8540_clk_init();
  83}
  84
  85void __init ux500_init_late(void)
  86{
  87        mop500_uib_init();
  88}
  89
  90static const char * __init ux500_get_machine(void)
  91{
  92        return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  93}
  94
  95static const char * __init ux500_get_family(void)
  96{
  97        return kasprintf(GFP_KERNEL, "ux500");
  98}
  99
 100static const char * __init ux500_get_revision(void)
 101{
 102        unsigned int rev = dbx500_revision();
 103
 104        if (rev == 0x01)
 105                return kasprintf(GFP_KERNEL, "%s", "ED");
 106        else if (rev >= 0xA0)
 107                return kasprintf(GFP_KERNEL, "%d.%d",
 108                                 (rev >> 4) - 0xA + 1, rev & 0xf);
 109
 110        return kasprintf(GFP_KERNEL, "%s", "Unknown");
 111}
 112
 113static ssize_t ux500_get_process(struct device *dev,
 114                                        struct device_attribute *attr,
 115                                        char *buf)
 116{
 117        if (dbx500_id.process == 0x00)
 118                return sprintf(buf, "Standard\n");
 119
 120        return sprintf(buf, "%02xnm\n", dbx500_id.process);
 121}
 122
 123static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 124                                     const char *soc_id)
 125{
 126        soc_dev_attr->soc_id   = soc_id;
 127        soc_dev_attr->machine  = ux500_get_machine();
 128        soc_dev_attr->family   = ux500_get_family();
 129        soc_dev_attr->revision = ux500_get_revision();
 130}
 131
 132struct device_attribute ux500_soc_attr =
 133        __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 134
 135struct device * __init ux500_soc_device_init(const char *soc_id)
 136{
 137        struct device *parent;
 138        struct soc_device *soc_dev;
 139        struct soc_device_attribute *soc_dev_attr;
 140
 141        soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 142        if (!soc_dev_attr)
 143                return ERR_PTR(-ENOMEM);
 144
 145        soc_info_populate(soc_dev_attr, soc_id);
 146
 147        soc_dev = soc_device_register(soc_dev_attr);
 148        if (IS_ERR_OR_NULL(soc_dev)) {
 149                kfree(soc_dev_attr);
 150                return NULL;
 151        }
 152
 153        parent = soc_device_to_device(soc_dev);
 154        if (!IS_ERR_OR_NULL(parent))
 155                device_create_file(parent, &ux500_soc_attr);
 156
 157        return parent;
 158}
 159