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-rw-r--r--arch/arm/mach-picoxcell/common.c61
1 files changed, 55 insertions, 6 deletions
diff --git a/arch/arm/mach-picoxcell/common.c b/arch/arm/mach-picoxcell/common.c
index 34d08347be5..a2e8ae8b582 100644
--- a/arch/arm/mach-picoxcell/common.c
+++ b/arch/arm/mach-picoxcell/common.c
@@ -7,23 +7,59 @@
*
* All enquiries to support@picochip.com
*/
+#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/mach/arch.h>
#include <asm/hardware/vic.h>
+#include <asm/mach/map.h>
#include <mach/map.h>
#include <mach/picoxcell_soc.h>
#include "common.h"
+#define WDT_CTRL_REG_EN_MASK (1 << 0)
+#define WDT_CTRL_REG_OFFS (0x00)
+#define WDT_TIMEOUT_REG_OFFS (0x04)
+static void __iomem *wdt_regs;
+
+/*
+ * The machine restart method can be called from an atomic context so we won't
+ * be able to ioremap the regs then.
+ */
+static void picoxcell_setup_restart(void)
+{
+ struct device_node *np = of_find_compatible_node(NULL, NULL,
+ "snps,dw-apb-wdg");
+ if (WARN(!np, "unable to setup watchdog restart"))
+ return;
+
+ wdt_regs = of_iomap(np, 0);
+ WARN(!wdt_regs, "failed to remap watchdog regs");
+}
+
+static struct map_desc io_map __initdata = {
+ .virtual = PHYS_TO_IO(PICOXCELL_PERIPH_BASE),
+ .pfn = __phys_to_pfn(PICOXCELL_PERIPH_BASE),
+ .length = PICOXCELL_PERIPH_LENGTH,
+ .type = MT_DEVICE,
+};
+
+static void __init picoxcell_map_io(void)
+{
+ iotable_init(&io_map, 1);
+}
+
static void __init picoxcell_init_machine(void)
{
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ picoxcell_setup_restart();
}
static const char *picoxcell_dt_match[] = {
@@ -33,23 +69,36 @@ static const char *picoxcell_dt_match[] = {
};
static const struct of_device_id vic_of_match[] __initconst = {
- { .compatible = "arm,pl192-vic" },
+ { .compatible = "arm,pl192-vic", .data = vic_of_init, },
{ /* Sentinel */ }
};
static void __init picoxcell_init_irq(void)
{
- vic_init(IO_ADDRESS(PICOXCELL_VIC0_BASE), 0, ~0, 0);
- vic_init(IO_ADDRESS(PICOXCELL_VIC1_BASE), 32, ~0, 0);
- irq_domain_generate_simple(vic_of_match, PICOXCELL_VIC0_BASE, 0);
- irq_domain_generate_simple(vic_of_match, PICOXCELL_VIC1_BASE, 32);
+ of_irq_init(vic_of_match);
+}
+
+static void picoxcell_wdt_restart(char mode, const char *cmd)
+{
+ /*
+ * Configure the watchdog to reset with the shortest possible timeout
+ * and give it chance to do the reset.
+ */
+ if (wdt_regs) {
+ writel_relaxed(WDT_CTRL_REG_EN_MASK, wdt_regs + WDT_CTRL_REG_OFFS);
+ writel_relaxed(0, wdt_regs + WDT_TIMEOUT_REG_OFFS);
+ /* No sleeping, possibly atomic. */
+ mdelay(500);
+ }
}
DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
.map_io = picoxcell_map_io,
- .nr_irqs = ARCH_NR_IRQS,
+ .nr_irqs = NR_IRQS_LEGACY,
.init_irq = picoxcell_init_irq,
+ .handle_irq = vic_handle_irq,
.timer = &picoxcell_timer,
.init_machine = picoxcell_init_machine,
.dt_compat = picoxcell_dt_match,
+ .restart = picoxcell_wdt_restart,
MACHINE_END