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Linux/arch/arm/mach-ux500/cpu.c

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  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/sys_soc.h>
 13 #include <linux/err.h>
 14 #include <linux/slab.h>
 15 #include <linux/stat.h>
 16 #include <linux/of.h>
 17 #include <linux/of_irq.h>
 18 #include <linux/of_address.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         struct device_node *np;
 56         struct resource r;
 57 
 58         irqchip_init();
 59         np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
 60         of_address_to_resource(np, 0, &r);
 61         of_node_put(np);
 62         if (!r.start) {
 63                 pr_err("could not find PRCMU base resource\n");
 64                 return;
 65         }
 66         prcmu_early_init(r.start, r.end-r.start);
 67         ux500_pm_init(r.start, r.end-r.start);
 68 
 69         /*
 70          * Init clocks here so that they are available for system timer
 71          * initialization.
 72          */
 73         if (cpu_is_u8500_family())
 74                 u8500_clk_init();
 75         else if (cpu_is_u9540())
 76                 u9540_clk_init();
 77         else if (cpu_is_u8540())
 78                 u8540_clk_init();
 79 }
 80 
 81 static const char * __init ux500_get_machine(void)
 82 {
 83         return kasprintf(GFP_KERNEL, "DB%4x", dbx500_partnumber());
 84 }
 85 
 86 static const char * __init ux500_get_family(void)
 87 {
 88         return kasprintf(GFP_KERNEL, "ux500");
 89 }
 90 
 91 static const char * __init ux500_get_revision(void)
 92 {
 93         unsigned int rev = dbx500_revision();
 94 
 95         if (rev == 0x01)
 96                 return kasprintf(GFP_KERNEL, "%s", "ED");
 97         else if (rev >= 0xA0)
 98                 return kasprintf(GFP_KERNEL, "%d.%d",
 99                                  (rev >> 4) - 0xA + 1, rev & 0xf);
100 
101         return kasprintf(GFP_KERNEL, "%s", "Unknown");
102 }
103 
104 static ssize_t ux500_get_process(struct device *dev,
105                                         struct device_attribute *attr,
106                                         char *buf)
107 {
108         if (dbx500_id.process == 0x00)
109                 return sprintf(buf, "Standard\n");
110 
111         return sprintf(buf, "%02xnm\n", dbx500_id.process);
112 }
113 
114 static void __init soc_info_populate(struct soc_device_attribute *soc_dev_attr,
115                                      const char *soc_id)
116 {
117         soc_dev_attr->soc_id   = soc_id;
118         soc_dev_attr->machine  = ux500_get_machine();
119         soc_dev_attr->family   = ux500_get_family();
120         soc_dev_attr->revision = ux500_get_revision();
121 }
122 
123 static const struct device_attribute ux500_soc_attr =
124         __ATTR(process,  S_IRUGO, ux500_get_process,  NULL);
125 
126 struct device * __init ux500_soc_device_init(const char *soc_id)
127 {
128         struct device *parent;
129         struct soc_device *soc_dev;
130         struct soc_device_attribute *soc_dev_attr;
131 
132         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
133         if (!soc_dev_attr)
134                 return ERR_PTR(-ENOMEM);
135 
136         soc_info_populate(soc_dev_attr, soc_id);
137 
138         soc_dev = soc_device_register(soc_dev_attr);
139         if (IS_ERR(soc_dev)) {
140                 kfree(soc_dev_attr);
141                 return NULL;
142         }
143 
144         parent = soc_device_to_device(soc_dev);
145         device_create_file(parent, &ux500_soc_attr);
146 
147         return parent;
148 }
149 

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