1 files changed, 72 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/at91sam9_rst.c b/arch/arm/mach-at91/at91sam9_rst.c
new file mode 100644
index 0000000000..8f03576e69
--- /dev/null
+++ b/arch/arm/mach-at91/at91sam9_rst.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Pengutronix, Ahmad Fatoum <a.fatoum@pengutronix.de>
+ */
+
+#include <common.h>
+#include <init.h>
+#include <io.h>
+#include <restart.h>
+#include <linux/clk.h>
+#include <mach/at91_rstc.h>
+
+struct at91sam9x_rst {
+	struct restart_handler restart;
+	void __iomem *base;
+};
+
+static void __noreturn at91sam9x_restart_soc(struct restart_handler *rst)
+{
+	struct at91sam9x_rst *priv = container_of(rst, struct at91sam9x_rst, restart);
+
+	writel(AT91_RSTC_PROCRST
+	       | AT91_RSTC_PERRST
+	       | AT91_RSTC_EXTRST
+	       | AT91_RSTC_KEY,
+	       priv->base + AT91_RSTC_CR);
+
+	hang();
+}
+
+static int at91sam9x_rst_probe(struct device_d *dev)
+{
+	struct at91sam9x_rst *priv;
+	struct resource *iores;
+	struct clk *clk;
+
+	iores = dev_request_mem_resource(dev, 0);
+	if (IS_ERR(iores)) {
+		dev_err(dev, "could not get reset memory region\n");
+		return PTR_ERR(iores);
+	}
+
+	priv = xzalloc(sizeof(*priv));
+	priv->base = IOMEM(iores->start);
+
+	clk = clk_get(dev, NULL);
+	if (IS_ERR(clk)) {
+		release_region(iores);
+		free(priv);
+		return PTR_ERR(clk);
+	}
+
+	clk_enable(clk);
+
+	priv->restart.name = "at91sam9x-rst";
+	priv->restart.restart = at91sam9x_restart_soc;
+
+	return restart_handler_register(&priv->restart);
+}
+
+static const __maybe_unused struct of_device_id at91sam9x_rst_dt_ids[] = {
+	{ .compatible = "atmel,at91sam9g45-rstc", },
+	{ .compatible = "atmel,sama5d3-rstc", },
+	{ /* sentinel */ },
+};
+
+static struct driver_d at91sam9x_rst_driver = {
+	.name		= "at91sam9x-rst",
+	.of_compatible	= DRV_OF_COMPAT(at91sam9x_rst_dt_ids),
+	.probe		= at91sam9x_rst_probe,
+};
+device_platform_driver(at91sam9x_rst_driver);