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 /*
  35  * FIXME: Should we set up the GPIO domain here?
  36  *
  37  * The problem is that we cannot put the interrupt resources into the platform
  38  * device until the irqdomain has been added. Right now, we set the GIC interrupt
  39  * domain from init_irq(), then load the gpio driver from
  40  * core_initcall(nmk_gpio_init) and add the platform devices from
  41  * arch_initcall(customize_machine).
  42  *
  43  * This feels fragile because it depends on the gpio device getting probed
  44  * _before_ any device uses the gpio interrupts.
  45 */
  46 void __init ux500_init_irq(void)
  47 {
  48         void __iomem *dist_base;
  49         void __iomem *cpu_base;
  50
  51         gic_arch_extn.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_MASK_ON_SUSPEND;
  52
  53         if (cpu_is_u8500_family() || cpu_is_ux540_family()) {
  54                 dist_base = __io_address(U8500_GIC_DIST_BASE);
  55                 cpu_base = __io_address(U8500_GIC_CPU_BASE);
  56         } else
  57                 ux500_unknown_soc();
  58
  59 #ifdef CONFIG_OF
  60         if (of_have_populated_dt())
  61                 irqchip_init();
  62         else
  63 #endif
  64                 gic_init(0, 29, dist_base, cpu_base);
  65
  66         /*
  67          * Init clocks here so that they are available for system timer
  68          * initialization.
  69          */
  70         if (cpu_is_u8500_family()) {
  71                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  72                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  73                 u8500_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  74                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  75                                U8500_CLKRST6_BASE);
  76         } else if (cpu_is_u9540()) {
  77                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K - 1);
  78                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K - 1);
  79                 u8500_clk_init(U8500_CLKRST1_BASE, U8500_CLKRST2_BASE,
  80                                U8500_CLKRST3_BASE, U8500_CLKRST5_BASE,
  81                                U8500_CLKRST6_BASE);
  82         } else if (cpu_is_u8540()) {
  83                 prcmu_early_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  84                 ux500_pm_init(U8500_PRCMU_BASE, SZ_8K + SZ_4K - 1);
  85                 u8540_clk_init();
  86         }
  87 }
  88
  89 void __init ux500_init_late(void)
  90 {
  91         mop500_uib_init();
  92 }
  93
  94 static const char * __init ux500_get_machine(void)
  95 {
  96         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
  97 }
  98
  99 static const char * __init ux500_get_family(void)
 100 {
 101         return kasprintf(GFP_KERNEL, "ux500");
 102 }
 103
 104 static const char * __init ux500_get_revision(void)
 105 {
 106         unsigned int rev = dbx500_revision();
 107
 108         if (rev == 0x01)
 109                 return kasprintf(GFP_KERNEL, "%s", "ED");
 110         else if (rev >= 0xA0)
 111                 return kasprintf(GFP_KERNEL, "%d.%d",
 112                                  (rev >> 4) - 0xA + 1, rev & 0xf);
 113
 114         return kasprintf(GFP_KERNEL, "%s", "Unknown");
 115 }
 116
 117 static ssize_t ux500_get_process(struct device *dev,
 118                                         struct device_attribute *attr,
 119                                         char *buf)
 120 {
 121         if (dbx500_id.process == 0x00)
 122                 return sprintf(buf, "Standard\n");
 123
 124         return sprintf(buf, "%02xnm\n", dbx500_id.process);
 125 }
 126
 127 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
 128                                      const char *soc_id)
 129 {
 130         soc_dev_attr->soc_id   = soc_id;
 131         soc_dev_attr->machine  = ux500_get_machine();
 132         soc_dev_attr->family   = ux500_get_family();
 133         soc_dev_attr->revision = ux500_get_revision();
 134 }
 135
 136 struct device_attribute ux500_soc_attr =
 137         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
 138
 139 struct device * __init ux500_soc_device_init(const char *soc_id)
 140 {
 141         struct device *parent;
 142         struct soc_device *soc_dev;
 143         struct soc_device_attribute *soc_dev_attr;
 144
 145         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 146         if (!soc_dev_attr)
 147                 return ERR_PTR(-ENOMEM);
 148
 149         soc_info_populate(soc_dev_attr, soc_id);
 150
 151         soc_dev = soc_device_register(soc_dev_attr);
 152         if (IS_ERR(soc_dev)) {
 153                 kfree(soc_dev_attr);
 154                 return NULL;
 155         }
 156
 157         parent = soc_device_to_device(soc_dev);
 158         device_create_file(parent, &ux500_soc_attr);
 159
 160         return parent;
 161 }