rockchip: reset: support a (common) rockchip reset drivers
Create driver to support the soft reset (i.e. peripheral)
of all Rockchip SoCs.
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 <zhangqing@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[Fixed commit tag:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
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),
+};