[U-Boot] [PATCH v3 15/25] rockchip: rk3288: Add SoC reset driver

Simon Glass
2015-06-23T23:29:00Z

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

Signed-off-by: Simon Glass <sjg@chromium.org>
---

Changes in v3: None
Changes in v2: None

arch/arm/mach-rockchip/rk3288/Makefile | 7 +++++
arch/arm/mach-rockchip/rk3288/reset_rk3288.c | 47 ++++++++++++++++++++++++++++
2 files changed, 54 insertions(+)
create mode 100644 arch/arm/mach-rockchip/rk3288/Makefile
create mode 100644 arch/arm/mach-rockchip/rk3288/reset_rk3288.c

diff --git a/arch/arm/mach-rockchip/rk3288/Makefile b/arch/arm/mach-rockchip/rk3288/Makefile
new file mode 100644
index 0000000..c6663f0
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3288/Makefile
@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2015 Google, Inc
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-y += reset_rk3288.o
diff --git a/arch/arm/mach-rockchip/rk3288/reset_rk3288.c b/arch/arm/mach-rockchip/rk3288/reset_rk3288.c
new file mode 100644
index 0000000..7affd11
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3288/reset_rk3288.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 <reset.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3288.h>
+#include <asm/arch/hardware.h>
+#include <linux/err.h>
+
+int rk3288_reset_request(struct udevice *dev, enum reset_t type)
+{
+ struct rk3288_cru *cru = rockchip_get_cru();
+
+ if (IS_ERR(cru))
+ return PTR_ERR(cru);
+ switch (type) {
+ case RESET_WARM:
+ writel(RK_CLRBITS(0xffff), &cru->cru_mode_con);
+ writel(0xeca8, &cru->cru_glb_srst_snd_value);
+ break;
+ case RESET_COLD:
+ writel(RK_CLRBITS(0xffff), &cru->cru_mode_con);
+ writel(0xfdb9, &cru->cru_glb_srst_fst_value);
+ break;
+ default:
+ return -EPROTONOSUPPORT;
+ }
+
+ return -EINPROGRESS;
+}
+
+static struct reset_ops rk3288_reset = {
+ .request = rk3288_reset_request,
+};
+
+U_BOOT_DRIVER(reset_rk3288) = {
+ .name = "rk3288_reset",
+ .id = UCLASS_RESET,
+ .ops = &rk3288_reset,
+};
--
2.4.3.573.g4eafbef