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/sys_soc.h>
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/stat.h>
  16 #include <linux/of.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/of_address.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
  33 void 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 */
  53 void __init ux500_init_irq(void)
  54 {
  55         struct device_node *np;
  56         struct resource r;
  57
  58         irqchip_init();
  59         np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
  60         of_address_to_resource(np, 0, &r);
  61         of_node_put(np);
  62         if (!r.start) {
  63                 pr_err("could not find PRCMU base resource\n");
  64                 return;
  65         }
  66         prcmu_early_init(r.start, r.end-r.start);
  67         ux500_pm_init(r.start, r.end-r.start);
  68
  69         /*
  70          * Init clocks here so that they are available for system timer
  71          * initialization.
  72          */
  73         if (cpu_is_u8500_family())
  74                 u8500_clk_init();
  75         else if (cpu_is_u9540())
  76                 u9540_clk_init();
  77         else if (cpu_is_u8540())
  78                 u8540_clk_init();
  79 }
  80
  81 static const char * __init ux500_get_machine(void)
  82 {
  83         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  84 }
  85
  86 static const char * __init ux500_get_family(void)
  87 {
  88         return kasprintf(GFP_KERNEL, "ux500");
  89 }
  90
  91 static const char * __init ux500_get_revision(void)
  92 {
  93         unsigned int rev = dbx500_revision();
  94
  95         if (rev == 0x01)
  96                 return kasprintf(GFP_KERNEL, "%s", "ED");
  97         else if (rev >= 0xA0)
  98                 return kasprintf(GFP_KERNEL, "%d.%d",
  99                                  (rev >> 4) - 0xA + 1, rev & 0xf);
 100
 101         return kasprintf(GFP_KERNEL, "%s", "Unknown");
 102 }
 103
 104 static ssize_t ux500_get_process(struct device *dev,
 105                                         struct device_attribute *attr,
 106                                         char *buf)
 107 {
 108         if (dbx500_id.process == 0x00)
 109                 return sprintf(buf, "Standard\n");
 110
 111         return sprintf(buf, "%02xnm\n", dbx500_id.process);
 112 }
 113
 114 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 115                                      const char *soc_id)
 116 {
 117         soc_dev_attr->soc_id   = soc_id;
 118         soc_dev_attr->machine  = ux500_get_machine();
 119         soc_dev_attr->family   = ux500_get_family();
 120         soc_dev_attr->revision = ux500_get_revision();
 121 }
 122
 123 static const struct device_attribute ux500_soc_attr =
 124         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 125
 126 struct device * __init ux500_soc_device_init(const char *soc_id)
 127 {
 128         struct device *parent;
 129         struct soc_device *soc_dev;
 130         struct soc_device_attribute *soc_dev_attr;
 131
 132         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 133         if (!soc_dev_attr)
 134                 return ERR_PTR(-ENOMEM);
 135
 136         soc_info_populate(soc_dev_attr, soc_id);
 137
 138         soc_dev = soc_device_register(soc_dev_attr);
 139         if (IS_ERR(soc_dev)) {
 140                 kfree(soc_dev_attr);
 141                 return NULL;
 142         }
 143
 144         parent = soc_device_to_device(soc_dev);
 145         device_create_file(parent, &ux500_soc_attr);
 146
 147         return parent;
 148 }