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/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/arm-ux500-pm.h>
  23
  24 #include <asm/mach/map.h>
  25
  26 #include "setup.h"
  27
  28 #include "board-mop500.h"
  29 #include "db8500-regs.h"
  30
  31 void ux500_restart(enum reboot_mode mode, const char *cmd)
  32 {
  33         local_irq_disable();
  34         local_fiq_disable();
  35
  36         prcmu_system_reset(0);
  37 }
  38
  39 /*
  40  * FIXME: Should we set up the GPIO domain here?
  41  *
  42  * The problem is that we cannot put the interrupt resources into the platform
  43  * device until the irqdomain has been added. Right now, we set the GIC interrupt
  44  * domain from init_irq(), then load the gpio driver from
  45  * core_initcall(nmk_gpio_init) and add the platform devices from
  46  * arch_initcall(customize_machine).
  47  *
  48  * This feels fragile because it depends on the gpio device getting probed
  49  * _before_ any device uses the gpio interrupts.
  50 */
  51 void __init ux500_init_irq(void)
  52 {
  53         struct device_node *np;
  54         struct resource r;
  55
  56         irqchip_init();
  57         np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
  58         of_address_to_resource(np, 0, &r);
  59         of_node_put(np);
  60         if (!r.start) {
  61                 pr_err("could not find PRCMU base resource\n");
  62                 return;
  63         }
  64         prcmu_early_init(r.start, r.end-r.start);
  65         ux500_pm_init(r.start, r.end-r.start);
  66         ux500_l2x0_init();
  67 }