rockchip: rk3036: Add Soc reset driver

We can reset the Soc using some CRU (clock/reset unit) register.
Add support for this.

Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/arm/mach-rockchip/rk3036/Makefile b/arch/arm/mach-rockchip/rk3036/Makefile
new file mode 100644 (file)
index 0000000..a483347
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3036/Makefile
@@ -0,0 +1,10 @@
+#
+# (C) Copyright 2015 Rockchip Electronics Co., Ltd
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+ifndef CONFIG_SPL_BUILD
+obj-y += reset_rk3036.o
+endif
+

diff --git a/arch/arm/mach-rockchip/rk3036/reset_rk3036.c b/arch/arm/mach-rockchip/rk3036/reset_rk3036.c
new file mode 100644 (file)
index 0000000..fefb568
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3036/reset_rk3036.c
@@ -0,0 +1,45 @@
+/*
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3036.h>
+#include <asm/arch/hardware.h>
+#include <linux/err.h>
+
+int rk3036_reset_request(struct udevice *dev, enum reset_t type)
+{
+       struct rk3036_cru *cru = rockchip_get_cru();
+
+       if (IS_ERR(cru))
+               return PTR_ERR(cru);
+       switch (type) {
+       case RESET_WARM:
+               writel(0xeca8, &cru->cru_glb_srst_snd_value);
+               break;
+       case RESET_COLD:
+               writel(0xfdb9, &cru->cru_glb_srst_fst_value);
+               break;
+       default:
+               return -EPROTONOSUPPORT;
+       }
+
+       return -EINPROGRESS;
+}
+
+static struct reset_ops rk3036_reset = {
+       .request        = rk3036_reset_request,
+};
+
+U_BOOT_DRIVER(reset_rk3036) = {
+       .name   = "rk3036_reset",
+       .id     = UCLASS_RESET,
+       .ops    = &rk3036_reset,
+};