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
  31 void __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 */
  45 static const struct of_device_id ux500_dt_irq_match[] = {
  46         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  47         {},
  48 };
  49
  50 void __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
  85 void __init ux500_init_late(void)
  86 {
  87         mop500_uib_init();
  88 }
  89
  90 static const char * __init ux500_get_machine(void)
  91 {
  92         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  93 }
  94
  95 static const char * __init ux500_get_family(void)
  96 {
  97         return kasprintf(GFP_KERNEL, "ux500");
  98 }
  99
 100 static 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
 113 static 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
 123 static 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
 132 struct device_attribute ux500_soc_attr =
 133         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 134
 135 struct 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 }