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/of_address.h>
  20 #include <linux/irq.h>
  21 #include <linux/irqchip.h>
  22 #include <linux/irqchip/arm-gic.h>
  23 #include <linux/platform_data/clk-ux500.h>
  24 #include <linux/platform_data/arm-ux500-pm.h>
  25
  26 #include <asm/mach/map.h>
  27
  28 #include "setup.h"
  29
  30 #include "board-mop500.h"
  31 #include "db8500-regs.h"
  32 #include "id.h"
  33
  34 void ux500_restart(enum reboot_mode mode, const char *cmd)
  35 {
  36         local_irq_disable();
  37         local_fiq_disable();
  38
  39         prcmu_system_reset(0);
  40 }
  41
  42 /*
  43  * FIXME: Should we set up the GPIO domain here?
  44  *
  45  * The problem is that we cannot put the interrupt resources into the platform
  46  * device until the irqdomain has been added. Right now, we set the GIC interrupt
  47  * domain from init_irq(), then load the gpio driver from
  48  * core_initcall(nmk_gpio_init) and add the platform devices from
  49  * arch_initcall(customize_machine).
  50  *
  51  * This feels fragile because it depends on the gpio device getting probed
  52  * _before_ any device uses the gpio interrupts.
  53 */
  54 void __init ux500_init_irq(void)
  55 {
  56         struct device_node *np;
  57         struct resource r;
  58
  59         irqchip_init();
  60         np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
  61         of_address_to_resource(np, 0, &r);
  62         of_node_put(np);
  63         if (!r.start) {
  64                 pr_err("could not find PRCMU base resource\n");
  65                 return;
  66         }
  67         prcmu_early_init(r.start, r.end-r.start);
  68         ux500_pm_init(r.start, r.end-r.start);
  69
  70         /*
  71          * Init clocks here so that they are available for system timer
  72          * initialization.
  73          */
  74         if (cpu_is_u8500_family())
  75                 u8500_clk_init();
  76         else if (cpu_is_u9540())
  77                 u9540_clk_init();
  78         else if (cpu_is_u8540())
  79                 u8540_clk_init();
  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 static const 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(soc_dev)) {
 141                 kfree(soc_dev_attr);
 142                 return NULL;
 143         }
 144
 145         parent = soc_device_to_device(soc_dev);
 146         device_create_file(parent, &ux500_soc_attr);
 147
 148         return parent;
 149 }