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/dbx500-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/irqchip.h>
  21#include <linux/irqchip/arm-gic.h>
  22#include <linux/platform_data/clk-ux500.h>
  23#include <linux/platform_data/arm-ux500-pm.h>
  24
  25#include <asm/mach/map.h>
  26
  27#include "setup.h"
  28
  29#include "board-mop500.h"
  30#include "db8500-regs.h"
  31#include "id.h"
  32
  33void ux500_restart(enum reboot_mode mode, const char *cmd)
  34{
  35        local_irq_disable();
  36        local_fiq_disable();
  37
  38        prcmu_system_reset(0);
  39}
  40
  41/*
  42 * FIXME: Should we set up the GPIO domain here?
  43 *
  44 * The problem is that we cannot put the interrupt resources into the platform
  45 * device until the irqdomain has been added. Right now, we set the GIC interrupt
  46 * domain from init_irq(), then load the gpio driver from
  47 * core_initcall(nmk_gpio_init) and add the platform devices from
  48 * arch_initcall(customize_machine).
  49 *
  50 * This feels fragile because it depends on the gpio device getting probed
  51 * _before_ any device uses the gpio interrupts.
  52*/
  53void __init ux500_init_irq(void)
  54{
  55        gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
  56        irqchip_init();
  57
  58        /*
  59         * Init clocks here so that they are available for system timer
  60         * initialization.
  61         */
  62        if (cpu_is_u8500_family()) {
  63                prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  64                ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  65
  66                u8500_of_clk_init(U8500_CLKRST1_BASE,
  67                                  U8500_CLKRST2_BASE,
  68                                  U8500_CLKRST3_BASE,
  69                                  U8500_CLKRST5_BASE,
  70                                  U8500_CLKRST6_BASE);
  71        } else if (cpu_is_u9540()) {
  72                prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  73                ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  74                u9540_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  75                               U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  76                               U8500_CLKRST6_BASE);
  77        } else if (cpu_is_u8540()) {
  78                prcmu_early_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  79                ux500_pm_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  80                u8540_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  81                               U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  82                               U8500_CLKRST6_BASE);
  83        }
  84}
  85
  86static const char * __init ux500_get_machine(void)
  87{
  88        return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  89}
  90
  91static const char * __init ux500_get_family(void)
  92{
  93        return kasprintf(GFP_KERNEL, "ux500");
  94}
  95
  96static const char * __init ux500_get_revision(void)
  97{
  98        unsigned int rev = dbx500_revision();
  99
 100        if (rev == 0x01)
 101                return kasprintf(GFP_KERNEL, "%s", "ED");
 102        else if (rev >= 0xA0)
 103                return kasprintf(GFP_KERNEL, "%d.%d",
 104                                 (rev >> 4) - 0xA + 1, rev & 0xf);
 105
 106        return kasprintf(GFP_KERNEL, "%s", "Unknown");
 107}
 108
 109static ssize_t ux500_get_process(struct device *dev,
 110                                        struct device_attribute *attr,
 111                                        char *buf)
 112{
 113        if (dbx500_id.process == 0x00)
 114                return sprintf(buf, "Standard\n");
 115
 116        return sprintf(buf, "%02xnm\n", dbx500_id.process);
 117}
 118
 119static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 120                                     const char *soc_id)
 121{
 122        soc_dev_attr->soc_id   = soc_id;
 123        soc_dev_attr->machine  = ux500_get_machine();
 124        soc_dev_attr->family   = ux500_get_family();
 125        soc_dev_attr->revision = ux500_get_revision();
 126}
 127
 128static const struct device_attribute ux500_soc_attr =
 129        __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 130
 131struct device * __init ux500_soc_device_init(const char *soc_id)
 132{
 133        struct device *parent;
 134        struct soc_device *soc_dev;
 135        struct soc_device_attribute *soc_dev_attr;
 136
 137        soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 138        if (!soc_dev_attr)
 139                return ERR_PTR(-ENOMEM);
 140
 141        soc_info_populate(soc_dev_attr, soc_id);
 142
 143        soc_dev = soc_device_register(soc_dev_attr);
 144        if (IS_ERR(soc_dev)) {
 145                kfree(soc_dev_attr);
 146                return NULL;
 147        }
 148
 149        parent = soc_device_to_device(soc_dev);
 150        device_create_file(parent, &ux500_soc_attr);
 151
 152        return parent;
 153}
 154