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/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         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
  56         irqchip_init();
  57
  58         /*
  59          * Init clocks here so that they are available for system timer
  60          * initialization.
  61          */
  62         if (cpu_is_u8500_family()) {
  63                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  64                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  65
  66                 u8500_of_clk_init(U8500_CLKRST1_BASE,
  67                                   U8500_CLKRST2_BASE,
  68                                   U8500_CLKRST3_BASE,
  69                                   U8500_CLKRST5_BASE,
  70                                   U8500_CLKRST6_BASE);
  71         } else if (cpu_is_u9540()) {
  72                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  73                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  74                 u9540_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  75                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  76                                U8500_CLKRST6_BASE);
  77         } else if (cpu_is_u8540()) {
  78                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  79                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  80                 u8540_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  81                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  82                                U8500_CLKRST6_BASE);
  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 static const 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(soc_dev)) {
 145                 kfree(soc_dev_attr);
 146                 return NULL;
 147         }
 148
 149         parent = soc_device_to_device(soc_dev);
 150         device_create_file(parent, &ux500_soc_attr);
 151
 152         return parent;
 153 }