2 * Copyright (C) 2008-2009 ST-Ericsson SA
4 * Author: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2, as
8 * published by the Free Software Foundation.
11 #include <linux/types.h>
12 #include <linux/init.h>
13 #include <linux/device.h>
14 #include <linux/amba/bus.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/irqchip.h>
18 #include <linux/irqchip/arm-gic.h>
19 #include <linux/mfd/dbx500-prcmu.h>
20 #include <linux/platform_data/arm-ux500-pm.h>
21 #include <linux/platform_device.h>
24 #include <linux/of_address.h>
25 #include <linux/of_platform.h>
26 #include <linux/perf/arm_pmu.h>
27 #include <linux/regulator/machine.h>
29 #include <asm/outercache.h>
30 #include <asm/hardware/cache-l2x0.h>
31 #include <asm/mach/map.h>
32 #include <asm/mach/arch.h>
34 #include "db8500-regs.h"
36 static int __init ux500_l2x0_unlock(void)
39 struct device_node *np;
40 void __iomem *l2x0_base;
42 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
43 l2x0_base = of_iomap(np, 0);
49 * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
50 * apparently locks both caches before jumping to the kernel. The
51 * l2x0 core will not touch the unlock registers if the l2x0 is
52 * already enabled, so we do it right here instead. The PL310 has
53 * 8 sets of registers, one per possible CPU.
55 for (i = 0; i < 8; i++) {
56 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
57 i * L2X0_LOCKDOWN_STRIDE);
58 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
59 i * L2X0_LOCKDOWN_STRIDE);
65 static void ux500_l2c310_write_sec(unsigned long val, unsigned reg)
68 * We can't write to secure registers as we are in non-secure
69 * mode, until we have some SMI service available.
74 * FIXME: Should we set up the GPIO domain here?
76 * The problem is that we cannot put the interrupt resources into the platform
77 * device until the irqdomain has been added. Right now, we set the GIC interrupt
78 * domain from init_irq(), then load the gpio driver from
79 * core_initcall(nmk_gpio_init) and add the platform devices from
80 * arch_initcall(customize_machine).
82 * This feels fragile because it depends on the gpio device getting probed
83 * _before_ any device uses the gpio interrupts.
85 static void __init ux500_init_irq(void)
87 struct device_node *np;
91 np = of_find_compatible_node(NULL, NULL, "stericsson,db8500-prcmu");
92 of_address_to_resource(np, 0, &r);
95 pr_err("could not find PRCMU base resource\n");
98 prcmu_early_init(r.start, r.end-r.start);
99 ux500_pm_init(r.start, r.end-r.start);
101 /* Unlock before init */
103 outer_cache.write_sec = ux500_l2c310_write_sec;
106 static void ux500_restart(enum reboot_mode mode, const char *cmd)
111 prcmu_system_reset(0);
115 * The PMU IRQ lines of two cores are wired together into a single interrupt.
116 * Bounce the interrupt to the other core if it's not ours.
118 static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
120 irqreturn_t ret = handler(irq, dev);
121 int other = !smp_processor_id();
123 if (ret == IRQ_NONE && cpu_online(other))
124 irq_set_affinity(irq, cpumask_of(other));
127 * We should be able to get away with the amount of IRQ_NONEs we give,
128 * while still having the spurious IRQ detection code kick in if the
129 * interrupt really starts hitting spuriously.
134 static struct arm_pmu_platdata db8500_pmu_platdata = {
135 .handle_irq = db8500_pmu_handler,
136 .irq_flags = IRQF_NOBALANCING | IRQF_NO_THREAD,
139 static struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
140 /* Requires call-back bindings. */
141 OF_DEV_AUXDATA("arm,cortex-a9-pmu", 0, "arm-pmu", &db8500_pmu_platdata),
145 static struct of_dev_auxdata u8540_auxdata_lookup[] __initdata = {
146 OF_DEV_AUXDATA("stericsson,db8500-prcmu", 0x80157000, "db8500-prcmu", NULL),
150 static const struct of_device_id u8500_local_bus_nodes[] = {
151 /* only create devices below soc node */
152 { .compatible = "stericsson,db8500", },
153 { .compatible = "stericsson,db8500-prcmu", },
154 { .compatible = "simple-bus"},
158 static void __init u8500_init_machine(void)
160 /* automatically probe child nodes of dbx5x0 devices */
161 if (of_machine_is_compatible("st-ericsson,u8540"))
162 of_platform_populate(NULL, u8500_local_bus_nodes,
163 u8540_auxdata_lookup, NULL);
165 of_platform_populate(NULL, u8500_local_bus_nodes,
166 u8500_auxdata_lookup, NULL);
169 static const char * stericsson_dt_platform_compat[] = {
177 DT_MACHINE_START(U8500_DT, "ST-Ericsson Ux5x0 platform (Device Tree Support)")
180 .init_irq = ux500_init_irq,
181 .init_machine = u8500_init_machine,
182 .dt_compat = stericsson_dt_platform_compat,
183 .restart = ux500_restart,