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 #include "devices.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         void __iomem *dist_base;
  57         void __iomem *cpu_base;
  58
  59         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
  60
  61         if (cpu_is_u8500_family() || cpu_is_ux540_family()) {
  62                 dist_base = __io_address(U8500_GIC_DIST_BASE);
  63                 cpu_base = __io_address(U8500_GIC_CPU_BASE);
  64         } else
  65                 ux500_unknown_soc();
  66
  67 #ifdef CONFIG_OF
  68         if (of_have_populated_dt())
  69                 irqchip_init();
  70         else
  71 #endif
  72                 gic_init(0, 29, dist_base, cpu_base);
  73
  74         /*
  75          * Init clocks here so that they are available for system timer
  76          * initialization.
  77          */
  78         if (cpu_is_u8500_family()) {
  79                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  80                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  81                 u8500_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  82                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  83                                U8500_CLKRST6_BASE);
  84         } else if (cpu_is_u9540()) {
  85                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  86                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  87                 u9540_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  88                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  89                                U8500_CLKRST6_BASE);
  90         } else if (cpu_is_u8540()) {
  91                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  92                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  93                 u8540_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  94                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  95                                U8500_CLKRST6_BASE);
  96         }
  97 }
  98
  99 void __init ux500_init_late(void)
 100 {
 101         mop500_uib_init();
 102 }
 103
 104 static const char * __init ux500_get_machine(void)
 105 {
 106         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
 107 }
 108
 109 static const char * __init ux500_get_family(void)
 110 {
 111         return kasprintf(GFP_KERNEL, "ux500");
 112 }
 113
 114 static const char * __init ux500_get_revision(void)
 115 {
 116         unsigned int rev = dbx500_revision();
 117
 118         if (rev == 0x01)
 119                 return kasprintf(GFP_KERNEL, "%s", "ED");
 120         else if (rev >= 0xA0)
 121                 return kasprintf(GFP_KERNEL, "%d.%d",
 122                                  (rev >> 4) - 0xA + 1, rev & 0xf);
 123
 124         return kasprintf(GFP_KERNEL, "%s", "Unknown");
 125 }
 126
 127 static ssize_t ux500_get_process(struct device *dev,
 128                                         struct device_attribute *attr,
 129                                         char *buf)
 130 {
 131         if (dbx500_id.process == 0x00)
 132                 return sprintf(buf, "Standard\n");
 133
 134         return sprintf(buf, "%02xnm\n", dbx500_id.process);
 135 }
 136
 137 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 138                                      const char *soc_id)
 139 {
 140         soc_dev_attr->soc_id   = soc_id;
 141         soc_dev_attr->machine  = ux500_get_machine();
 142         soc_dev_attr->family   = ux500_get_family();
 143         soc_dev_attr->revision = ux500_get_revision();
 144 }
 145
 146 struct device_attribute ux500_soc_attr =
 147         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 148
 149 struct device * __init ux500_soc_device_init(const char *soc_id)
 150 {
 151         struct device *parent;
 152         struct soc_device *soc_dev;
 153         struct soc_device_attribute *soc_dev_attr;
 154
 155         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 156         if (!soc_dev_attr)
 157                 return ERR_PTR(-ENOMEM);
 158
 159         soc_info_populate(soc_dev_attr, soc_id);
 160
 161         soc_dev = soc_device_register(soc_dev_attr);
 162         if (IS_ERR(soc_dev)) {
 163                 kfree(soc_dev_attr);
 164                 return NULL;
 165         }
 166
 167         parent = soc_device_to_device(soc_dev);
 168         device_create_file(parent, &ux500_soc_attr);
 169
 170         return parent;
 171 }