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/irqchip.h>
  21 #include <linux/irqchip/arm-gic.h>
  22 #include <linux/platform_data/clk-ux500.h>
  23
  24 #include <asm/mach/map.h>
  25
  26 #include <mach/hardware.h>
  27 #include <mach/setup.h>
  28 #include <mach/devices.h>
  29
  30 #include "board-mop500.h"
  31 #include "id.h"
  32
  33 void __iomem *_PRCMU_BASE;
  34
  35 /*
  36  * FIXME: Should we set up the GPIO domain here?
  37  *
  38  * The problem is that we cannot put the interrupt resources into the platform
  39  * device until the irqdomain has been added. Right now, we set the GIC interrupt
  40  * domain from init_irq(), then load the gpio driver from
  41  * core_initcall(nmk_gpio_init) and add the platform devices from
  42  * arch_initcall(customize_machine).
  43  *
  44  * This feels fragile because it depends on the gpio device getting probed
  45  * _before_ any device uses the gpio interrupts.
  46 */
  47 void __init ux500_init_irq(void)
  48 {
  49         void __iomem *dist_base;
  50         void __iomem *cpu_base;
  51
  52         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
  53
  54         if (cpu_is_u8500_family() || cpu_is_ux540_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                 irqchip_init();
  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() || cpu_is_u9540())
  72                 db8500_prcmu_early_init();
  73
  74         if (cpu_is_u8500_family() || cpu_is_u9540())
  75                 u8500_clk_init();
  76         else if (cpu_is_u8540())
  77                 u8540_clk_init();
  78 }
  79
  80 void __init ux500_init_late(void)
  81 {
  82         mop500_uib_init();
  83 }
  84
  85 static const char * __init ux500_get_machine(void)
  86 {
  87         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  88 }
  89
  90 static const char * __init ux500_get_family(void)
  91 {
  92         return kasprintf(GFP_KERNEL, "ux500");
  93 }
  94
  95 static const char * __init ux500_get_revision(void)
  96 {
  97         unsigned int rev = dbx500_revision();
  98
  99         if (rev == 0x01)
 100                 return kasprintf(GFP_KERNEL, "%s", "ED");
 101         else if (rev >= 0xA0)
 102                 return kasprintf(GFP_KERNEL, "%d.%d",
 103                                  (rev >> 4) - 0xA + 1, rev & 0xf);
 104
 105         return kasprintf(GFP_KERNEL, "%s", "Unknown");
 106 }
 107
 108 static ssize_t ux500_get_process(struct device *dev,
 109                                         struct device_attribute *attr,
 110                                         char *buf)
 111 {
 112         if (dbx500_id.process == 0x00)
 113                 return sprintf(buf, "Standard\n");
 114
 115         return sprintf(buf, "%02xnm\n", dbx500_id.process);
 116 }
 117
 118 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 119                                      const char *soc_id)
 120 {
 121         soc_dev_attr->soc_id   = soc_id;
 122         soc_dev_attr->machine  = ux500_get_machine();
 123         soc_dev_attr->family   = ux500_get_family();
 124         soc_dev_attr->revision = ux500_get_revision();
 125 }
 126
 127 struct device_attribute ux500_soc_attr =
 128         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 129
 130 struct device * __init ux500_soc_device_init(const char *soc_id)
 131 {
 132         struct device *parent;
 133         struct soc_device *soc_dev;
 134         struct soc_device_attribute *soc_dev_attr;
 135
 136         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 137         if (!soc_dev_attr)
 138                 return ERR_PTR(-ENOMEM);
 139
 140         soc_info_populate(soc_dev_attr, soc_id);
 141
 142         soc_dev = soc_device_register(soc_dev_attr);
 143         if (IS_ERR_OR_NULL(soc_dev)) {
 144                 kfree(soc_dev_attr);
 145                 return NULL;
 146         }
 147
 148         parent = soc_device_to_device(soc_dev);
 149         if (!IS_ERR_OR_NULL(parent))
 150                 device_create_file(parent, &ux500_soc_attr);
 151
 152         return parent;
 153 }