3 files changed, 92 insertions, 0 deletions
diff --git a/arch/arm/mach-picoxcell/Kconfig b/arch/arm/mach-picoxcell/Kconfig
new file mode 100644
index 000000000..b8eba18c0
--- /dev/null
+++ b/arch/arm/mach-picoxcell/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config ARCH_PICOXCELL
+	bool "Picochip PicoXcell"
+	depends on ARCH_MULTI_V6
+	select ARM_VIC
+	select DW_APB_TIMER_OF
+	select GPIOLIB
+	select HAVE_TCM
+	select NO_IOPORT_MAP
diff --git a/arch/arm/mach-picoxcell/Makefile b/arch/arm/mach-picoxcell/Makefile
new file mode 100644
index 000000000..aef039380
--- /dev/null
+++ b/arch/arm/mach-picoxcell/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y	:= common.o
diff --git a/arch/arm/mach-picoxcell/common.c b/arch/arm/mach-picoxcell/common.c
new file mode 100644
index 000000000..8e738266a
--- /dev/null
+++ b/arch/arm/mach-picoxcell/common.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2011 Picochip Ltd., Jamie Iles
+ *
+ * All enquiries to support@picochip.com
+ */
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/reboot.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#define PHYS_TO_IO(x)			(((x) & 0x00ffffff) | 0xfe000000)
+#define PICOXCELL_PERIPH_BASE		0x80000000
+#define PICOXCELL_PERIPH_LENGTH		SZ_4M
+
+#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)
+{
+	picoxcell_setup_restart();
+}
+
+static const char *picoxcell_dt_match[] = {
+	"picochip,pc3x2",
+	"picochip,pc3x3",
+	NULL
+};
+
+static void picoxcell_wdt_restart(enum reboot_mode 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,
+	.init_machine	= picoxcell_init_machine,
+	.dt_compat	= picoxcell_dt_match,
+	.restart	= picoxcell_wdt_restart,
+MACHINE_END