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