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/platform_data/clk-ux500.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 void __iomem *_PRCMU_BASE;
  29
  30 /*
  31  * FIXME: Should we set up the GPIO domain here?
  32  *
  33  * The problem is that we cannot put the interrupt resources into the platform
  34  * device until the irqdomain has been added. Right now, we set the GIC interrupt
  35  * domain from init_irq(), then load the gpio driver from
  36  * core_initcall(nmk_gpio_init) and add the platform devices from
  37  * arch_initcall(customize_machine).
  38  *
  39  * This feels fragile because it depends on the gpio device getting probed
  40  * _before_ any device uses the gpio interrupts.
  41 */
  42 static const struct of_device_id ux500_dt_irq_match[] = {
  43         { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
  44         {},
  45 };
  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                 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
  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 void __init ux500_init_late(void)
  83 {
  84 }
  85
  86 static const char * __init ux500_get_machine(void)
  87 {
  88         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  89 }
  90
  91 static const char * __init ux500_get_family(void)
  92 {
  93         return kasprintf(GFP_KERNEL, "ux500");
  94 }
  95
  96 static const char * __init ux500_get_revision(void)
  97 {
  98         unsigned int rev = dbx500_revision();
  99
 100         if (rev == 0x01)
 101                 return kasprintf(GFP_KERNEL, "%s", "ED");
 102         else if (rev >= 0xA0)
 103                 return kasprintf(GFP_KERNEL, "%d.%d",
 104                                  (rev >> 4) - 0xA + 1, rev & 0xf);
 105
 106         return kasprintf(GFP_KERNEL, "%s", "Unknown");
 107 }
 108
 109 static ssize_t ux500_get_process(struct device *dev,
 110                                         struct device_attribute *attr,
 111                                         char *buf)
 112 {
 113         if (dbx500_id.process == 0x00)
 114                 return sprintf(buf, "Standard\n");
 115
 116         return sprintf(buf, "%02xnm\n", dbx500_id.process);
 117 }
 118
 119 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 120                                      const char *soc_id)
 121 {
 122         soc_dev_attr->soc_id   = soc_id;
 123         soc_dev_attr->machine  = ux500_get_machine();
 124         soc_dev_attr->family   = ux500_get_family();
 125         soc_dev_attr->revision = ux500_get_revision();
 126 }
 127
 128 struct device_attribute ux500_soc_attr =
 129         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 130
 131 struct device * __init ux500_soc_device_init(const char *soc_id)
 132 {
 133         struct device *parent;
 134         struct soc_device *soc_dev;
 135         struct soc_device_attribute *soc_dev_attr;
 136
 137         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 138         if (!soc_dev_attr)
 139                 return ERR_PTR(-ENOMEM);
 140
 141         soc_info_populate(soc_dev_attr, soc_id);
 142
 143         soc_dev = soc_device_register(soc_dev_attr);
 144         if (IS_ERR_OR_NULL(soc_dev)) {
 145                 kfree(soc_dev_attr);
 146                 return NULL;
 147         }
 148
 149         parent = soc_device_to_device(soc_dev);
 150         if (!IS_ERR_OR_NULL(parent))
 151                 device_create_file(parent, &ux500_soc_attr);
 152
 153         return parent;
 154 }