From: Elaine Zhang <zhangq...@rock-chips.com>
Create driver to support all Rockchip SoCs soft reset.
Example of usage:
i2c driver:
ret = reset_get_by_name(dev, "i2c", &reset_ctl);
if (ret) {
error("reset_get_by_name() failed: %d\n", ret);
}
reset_assert(&reset_ctl);
udelay(50);
reset_deassert(&reset_ctl);
i2c dts node:
resets = <&cru SRST_P_I2C1>, <&cru SRST_I2C1>;
reset-names = "p_i2c", "i2c";
Signed-off-by: Elaine Zhang <zhangq...@rock-chips.com>
Signed-off-by: Kever Yang <kever.y...@rock-chips.com>
---
Changes in v3: None
Changes in v2:
- fix Kconfig more than 80 length
- use MACRO for reset bits in one reg
- use rkclr/set_reg for reg access
- add rockchip_reset_bind()
- use dev_read_addr_size() instead of fdtdec_
drivers/reset/Kconfig | 9 +++
drivers/reset/Makefile | 1 +
drivers/reset/reset-rockchip.c | 133 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 143 insertions(+)
create mode 100644 drivers/reset/reset-rockchip.c
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index ce46e27..97a78d7 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -74,4 +74,13 @@ config AST2500_RESET
resets that are supported by watchdog. The main limitation though
is that some reset signals, like I2C or MISC reset multiple devices.
+config RESET_ROCKCHIP
+ bool "Reset controller driver for Rockchip SoCs"
+ depends on DM_RESET && CLK
+ default y
+ help
+ Support for reset controller on rockchip SoC. The main limitation
+ though is that some reset signals, like I2C or MISC reset multiple
+ devices.
+
endmenu
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 252cefe..7d7e080 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o
obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_AST2500_RESET) += ast2500-reset.o
+obj-$(CONFIG_RESET_ROCKCHIP) += reset-rockchip.o
diff --git a/drivers/reset/reset-rockchip.c b/drivers/reset/reset-rockchip.c
new file mode 100644
index 0000000..01047a2
--- /dev/null
+++ b/drivers/reset/reset-rockchip.c
@@ -0,0 +1,133 @@
+/*
+ * (C) Copyright 2017 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <reset-uclass.h>
+#include <linux/io.h>
+#include <asm/arch/hardware.h>
+#include <dm/lists.h>
+/*
+ * Each reg has 16 bits reset signal for devices
+ * Note: Not including rk2818 and older SoCs
+ */
+#define ROCKCHIP_RESET_NUM_IN_REG 16
+
+struct rockchip_reset_priv {
+ void __iomem *base;
+ /* Rockchip reset reg locate at cru controller */
+ u32 reset_reg_offset;
+ /* Rockchip reset reg number */
+ u32 reset_reg_num;
+};
+
+static int rockchip_reset_request(struct reset_ctl *reset_ctl)
+{
+ struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+
+ debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
+ reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
+
+ if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int rockchip_reset_free(struct reset_ctl *reset_ctl)
+{
+ debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
+ reset_ctl->dev, reset_ctl->id);
+
+ return 0;
+}
+
+static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
+{
+ struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
+ int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
+
+ debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
+ reset_ctl, reset_ctl->dev, reset_ctl->id,
+ priv->base + (bank * 4));
+
+ rk_setreg(priv->base + (bank * 4), BIT(offset));
+
+ return 0;
+}
+
+static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
+{
+ struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
+ int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
+
+ debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
+ reset_ctl, reset_ctl->dev, reset_ctl->id,
+ priv->base + (bank * 4));
+
+ rk_clrreg(priv->base + (bank * 4), BIT(offset));
+
+ return 0;
+}
+
+struct reset_ops rockchip_reset_ops = {
+ .request = rockchip_reset_request,
+ .free = rockchip_reset_free,
+ .rst_assert = rockchip_reset_assert,
+ .rst_deassert = rockchip_reset_deassert,
+};
+
+static int rockchip_reset_probe(struct udevice *dev)
+{
+ struct rockchip_reset_priv *priv = dev_get_priv(dev);
+ fdt_addr_t addr;
+ fdt_size_t size;
+
+ addr = dev_read_addr_size(dev, "reg", &size);
+ if (addr == FDT_ADDR_T_NONE)
+ return -EINVAL;
+
+ if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
+ return -EINVAL;
+
+ addr += priv->reset_reg_offset;
+ priv->base = ioremap(addr, size);
+
+ debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
+ priv->base, priv->reset_reg_offset, priv->reset_reg_num);
+
+ return 0;
+}
+
+int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
+{
+ struct udevice *rst_dev;
+ struct rockchip_reset_priv *priv;
+ int ret;
+
+ ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
+ dev_ofnode(pdev), &rst_dev);
+ if (ret) {
+ debug("Warning: No rockchip reset driver: ret=%d\n", ret);
+ return ret;
+ }
+ priv = malloc(sizeof(struct rockchip_reset_priv));
+ priv->reset_reg_offset = reg_offset;
+ priv->reset_reg_num = reg_number;
+ rst_dev->priv = priv;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(rockchip_reset) = {
+ .name = "rockchip_reset",
+ .id = UCLASS_RESET,
+ .probe = rockchip_reset_probe,
+ .ops = &rockchip_reset_ops,
+ .priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
+};
--
1.9.1
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