STiH410: Add STi sysreset driver

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/sysreset/Makefile

@@ -13,5 +13,6 @@ obj-$(CONFIG_ROCKCHIP_RK3288) += sysreset_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += sysreset_rk3399.o
 obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o
 obj-$(CONFIG_ARCH_SNAPDRAGON) += sysreset_snapdragon.o
+obj-$(CONFIG_ARCH_STI) += sysreset_sti.o
 obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o
 obj-$(CONFIG_ARCH_ASPEED) += sysreset_ast.o

drivers/sysreset/sysreset_sti.c

@@ -0,0 +1,82 @@
+/*
+ * (C) Copyright 2017 Patrice Chotard <patrice.chotard@st.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <sysreset.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct sti_sysreset_priv {
+	phys_addr_t base;
+};
+
+static int sti_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct sti_sysreset_priv *priv = dev_get_priv(dev);
+
+	generic_clear_bit(0, (void __iomem *)priv->base);
+
+	return -EINPROGRESS;
+}
+
+static int sti_sysreset_probe(struct udevice *dev)
+{
+	struct sti_sysreset_priv *priv = dev_get_priv(dev);
+	struct udevice *syscon;
+	struct regmap *regmap;
+	struct fdtdec_phandle_args syscfg_phandle;
+	int ret;
+
+	/* get corresponding syscon phandle */
+	ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
+					     "st,syscfg", NULL, 0, 0,
+					     &syscfg_phandle);
+	if (ret < 0) {
+		error("Can't get syscfg phandle: %d\n", ret);
+		return ret;
+	}
+
+	ret = uclass_get_device_by_of_offset(UCLASS_SYSCON,
+					     syscfg_phandle.node,
+					     &syscon);
+	if (ret) {
+		error("%s: uclass_get_device_by_of_offset failed: %d\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	regmap = syscon_get_regmap(syscon);
+	if (!regmap) {
+		error("unable to get regmap for %s\n", syscon->name);
+		return -ENODEV;
+	}
+
+	priv->base = regmap->base;
+
+	return 0;
+}
+
+static struct sysreset_ops sti_sysreset = {
+	.request	= sti_sysreset_request,
+};
+
+static const struct udevice_id sti_sysreset_ids[] = {
+	{ .compatible = "st,stih407-restart" },
+	{ }
+};
+
+U_BOOT_DRIVER(sysreset_sti) = {
+	.name = "sysreset_sti",
+	.id = UCLASS_SYSRESET,
+	.ops = &sti_sysreset,
+	.probe = sti_sysreset_probe,
+	.of_match = sti_sysreset_ids,
+	.priv_auto_alloc_size = sizeof(struct sti_sysreset_priv),
+};