[U-Boot] [PATCH 1/2] ARC: HSDK: introduce reset driver
Eugeniy Paltsev
Eugeniy.Paltsev at synopsys.com
Tue Oct 8 16:29:30 UTC 2019
Introduce reset driver for Synopsys ARC HSDK SoC
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev at synopsys.com>
---
drivers/reset/Kconfig | 7 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-hsdk.c | 116 ++++++++++++++++++++
include/dt-bindings/reset/snps,hsdk-reset.h | 17 +++
4 files changed, 141 insertions(+)
create mode 100644 drivers/reset/reset-hsdk.c
create mode 100644 include/dt-bindings/reset/snps,hsdk-reset.h
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 6ec6f39c85f..3071af5f692 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -91,6 +91,13 @@ config RESET_ROCKCHIP
though is that some reset signals, like I2C or MISC reset multiple
devices.
+config RESET_HSDK
+ bool "Synopsys HSDK Reset Driver"
+ depends on DM_RESET && TARGET_HSDK
+ default y
+ help
+ This enables the reset controller driver for HSDK board.
+
config RESET_MESON
bool "Reset controller driver for Amlogic Meson SoCs"
depends on DM_RESET && ARCH_MESON
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 7fec75bb492..1c4401c7f2b 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_STM32_RESET) += stm32-reset.o
obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o
obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o
obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
+obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_AST2500_RESET) += ast2500-reset.o
diff --git a/drivers/reset/reset-hsdk.c b/drivers/reset/reset-hsdk.c
new file mode 100644
index 00000000000..213d6c87be1
--- /dev/null
+++ b/drivers/reset/reset-hsdk.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * HSDK SoC Reset Controller driver
+ *
+ * Copyright (C) 2019 Synopsys, Inc. All rights reserved.
+ * Author: Eugeniy Paltsev <Eugeniy.Paltsev at synopsys.com>
+ */
+
+#include <asm/io.h>
+#include <common.h>
+#include <dm.h>
+#include <linux/iopoll.h>
+#include <reset-uclass.h>
+
+struct hsdk_rst {
+ void __iomem *regs_ctl;
+ void __iomem *regs_rst;
+};
+
+static const u32 rst_map[] = {
+ BIT(16), /* APB_RST */
+ BIT(17), /* AXI_RST */
+ BIT(18), /* ETH_RST */
+ BIT(19), /* USB_RST */
+ BIT(20), /* SDIO_RST */
+ BIT(21), /* HDMI_RST */
+ BIT(22), /* GFX_RST */
+ BIT(25), /* DMAC_RST */
+ BIT(31), /* EBI_RST */
+};
+
+#define HSDK_MAX_RESETS ARRAY_SIZE(rst_map)
+
+#define CGU_SYS_RST_CTRL 0x0
+#define CGU_IP_SW_RESET 0x0
+#define CGU_IP_SW_RESET_DELAY_SHIFT 16
+#define CGU_IP_SW_RESET_DELAY_MASK GENMASK(31, CGU_IP_SW_RESET_DELAY_SHIFT)
+#define CGU_IP_SW_RESET_DELAY 0
+#define CGU_IP_SW_RESET_RESET BIT(0)
+#define SW_RESET_TIMEOUT 10000
+
+static void hsdk_reset_config(struct hsdk_rst *rst, unsigned long id)
+{
+ writel(rst_map[id], rst->regs_ctl + CGU_SYS_RST_CTRL);
+}
+
+static int hsdk_reset_do(struct hsdk_rst *rst)
+{
+ u32 reg;
+
+ reg = readl(rst->regs_rst + CGU_IP_SW_RESET);
+ reg &= ~CGU_IP_SW_RESET_DELAY_MASK;
+ reg |= CGU_IP_SW_RESET_DELAY << CGU_IP_SW_RESET_DELAY_SHIFT;
+ reg |= CGU_IP_SW_RESET_RESET;
+ writel(reg, rst->regs_rst + CGU_IP_SW_RESET);
+
+ /* wait till reset bit is back to 0 */
+ return readl_poll_timeout(rst->regs_rst + CGU_IP_SW_RESET, reg,
+ !(reg & CGU_IP_SW_RESET_RESET), SW_RESET_TIMEOUT);
+}
+
+static int hsdk_reset_reset(struct reset_ctl *rst_ctl)
+{
+ struct udevice *dev = rst_ctl->dev;
+ struct hsdk_rst *rst = dev_get_priv(dev);
+
+ if (rst_ctl->id >= HSDK_MAX_RESETS)
+ return -EINVAL;
+
+ debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, rst_ctl,
+ rst_ctl->dev, rst_ctl->id);
+
+ hsdk_reset_config(rst, rst_ctl->id);
+ return hsdk_reset_do(rst);
+}
+
+static int hsdk_reset_noop(struct reset_ctl *rst_ctl)
+{
+ return 0;
+}
+
+static const struct reset_ops hsdk_reset_ops = {
+ .request = hsdk_reset_noop,
+ .free = hsdk_reset_noop,
+ .rst_assert = hsdk_reset_noop,
+ .rst_deassert = hsdk_reset_reset,
+};
+
+static const struct udevice_id hsdk_reset_dt_match[] = {
+ { .compatible = "snps,hsdk-reset" },
+ { },
+};
+
+static int hsdk_reset_probe(struct udevice *dev)
+{
+ struct hsdk_rst *rst = dev_get_priv(dev);
+
+ rst->regs_ctl = dev_remap_addr_index(dev, 0);
+ if (!rst->regs_ctl)
+ return -EINVAL;
+
+ rst->regs_rst = dev_remap_addr_index(dev, 1);
+ if (!rst->regs_rst)
+ return -EINVAL;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(hsdk_reset) = {
+ .name = "hsdk-reset",
+ .id = UCLASS_RESET,
+ .of_match = hsdk_reset_dt_match,
+ .ops = &hsdk_reset_ops,
+ .probe = hsdk_reset_probe,
+ .priv_auto_alloc_size = sizeof(struct hsdk_rst),
+};
diff --git a/include/dt-bindings/reset/snps,hsdk-reset.h b/include/dt-bindings/reset/snps,hsdk-reset.h
new file mode 100644
index 00000000000..e1a643e4bc9
--- /dev/null
+++ b/include/dt-bindings/reset/snps,hsdk-reset.h
@@ -0,0 +1,17 @@
+/**
+ * This header provides index for the HSDK reset controller.
+ */
+#ifndef _DT_BINDINGS_RESET_CONTROLLER_SNPS_HSDK
+#define _DT_BINDINGS_RESET_CONTROLLER_SNPS_HSDK
+
+#define HSDK_APB_RESET 0
+#define HSDK_AXI_RESET 1
+#define HSDK_ETH_RESET 2
+#define HSDK_USB_RESET 3
+#define HSDK_SDIO_RESET 4
+#define HSDK_HDMI_RESET 5
+#define HSDK_GFX_RESET 6
+#define HSDK_DMAC_RESET 7
+#define HSDK_EBI_RESET 8
+
+#endif /*_DT_BINDINGS_RESET_CONTROLLER_SNPS_HSDK*/
--
2.21.0
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