rockchip: rk3188: Add sysreset driver

Driver for the sysreset of Rockchip rk3188 socs.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Kever Yang <kever.yang@rock-chips.com>

drivers/sysreset/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_SYSRESET) += sysreset-uclass.o
 ifndef CONFIG_SPL_BUILD
 obj-$(CONFIG_ROCKCHIP_RK3036) += sysreset_rk3036.o
 endif
+obj-$(CONFIG_ROCKCHIP_RK3188) += sysreset_rk3188.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += sysreset_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += sysreset_rk3399.o
 obj-$(CONFIG_SANDBOX) += sysreset_sandbox.o

drivers/sysreset/sysreset_rk3188.c

@@ -0,0 +1,47 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3188.h>
+#include <asm/arch/hardware.h>
+#include <linux/err.h>
+
+int rk3188_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct rk3188_cru *cru = rockchip_get_cru();
+
+	if (IS_ERR(cru))
+		return PTR_ERR(cru);
+	switch (type) {
+	case SYSRESET_WARM:
+		rk_clrreg(&cru->cru_mode_con, 0xffff);
+		writel(0xeca8, &cru->cru_glb_srst_snd_value);
+		break;
+	case SYSRESET_COLD:
+		rk_clrreg(&cru->cru_mode_con, 0xffff);
+		writel(0xfdb9, &cru->cru_glb_srst_fst_value);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops rk3188_sysreset = {
+	.request	= rk3188_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_rk3188) = {
+	.name	= "rk3188_sysreset",
+	.id	= UCLASS_SYSRESET,
+	.ops	= &rk3188_sysreset,
+};