[PATCH 3/4] reset: airoha: Add driver for controlling reset line of AN7581
Christian Marangi
ansuelsmth at gmail.com
Sun Mar 9 15:06:45 CET 2025
Add driver for controlling the reset lines of AN7581. This is a detached
version of the clock controller driver present in Linux only used to
control reset lines. Driver gets loaded with the bind of the clock
driver and doesn't require a compatible. This is needed as they share
the same registers.
Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
---
drivers/clk/airoha/clk-airoha.c | 16 ++
drivers/reset/Kconfig | 7 +
drivers/reset/Makefile | 1 +
drivers/reset/reset-airoha.c | 173 ++++++++++++++++++
.../dt-bindings/reset/airoha,en7581-reset.h | 66 +++++++
5 files changed, 263 insertions(+)
create mode 100644 drivers/reset/reset-airoha.c
create mode 100644 include/dt-bindings/reset/airoha,en7581-reset.h
diff --git a/drivers/clk/airoha/clk-airoha.c b/drivers/clk/airoha/clk-airoha.c
index 96d120feba7..1b2c4c98de5 100644
--- a/drivers/clk/airoha/clk-airoha.c
+++ b/drivers/clk/airoha/clk-airoha.c
@@ -416,6 +416,21 @@ static int airoha_clk_probe(struct udevice *dev)
return 0;
}
+static int airoha_clk_bind(struct udevice *dev)
+{
+ struct udevice *rst_dev;
+ int ret = 0;
+
+ if (CONFIG_IS_ENABLED(RESET_AIROHA)) {
+ ret = device_bind_driver_to_node(dev, "airoha-reset", "reset",
+ dev_ofnode(dev), &rst_dev);
+ if (ret)
+ debug("Warning: failed to bind reset controller\n");
+ }
+
+ return ret;
+}
+
static const struct airoha_clk_soc_data en7581_data = {
.num_clocks = ARRAY_SIZE(en7581_base_clks),
.descs = en7581_base_clks,
@@ -433,6 +448,7 @@ U_BOOT_DRIVER(airoha_clk) = {
.id = UCLASS_CLK,
.of_match = airoha_clk_ids,
.probe = airoha_clk_probe,
+ .bind = airoha_clk_bind,
.priv_auto = sizeof(struct airoha_clk_priv),
.ops = &airoha_clk_ops,
};
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index fe5c1214f57..ee923c19f41 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -49,6 +49,13 @@ config TEGRA186_RESET
Enable support for manipulating Tegra's on-SoC reset signals via IPC
requests to the BPMP (Boot and Power Management Processor).
+config RESET_AIROHA
+ bool "Reset controller driver for Airoha SoCs"
+ depends on DM_RESET && ARCH_AIROHA
+ default y
+ help
+ Support for reset controller on Airoha SoCs.
+
config RESET_TI_SCI
bool "TI System Control Interface (TI SCI) reset driver"
depends on DM_RESET && TI_SCI_PROTOCOL
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index d99a78c9828..524fc064417 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_STI_RESET) += sti-reset.o
obj-$(CONFIG_STM32_RESET) += stm32-reset.o
obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o
obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o
+obj-$(CONFIG_RESET_AIROHA) += reset-airoha.o
obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
diff --git a/drivers/reset/reset-airoha.c b/drivers/reset/reset-airoha.c
new file mode 100644
index 00000000000..e878af6167c
--- /dev/null
+++ b/drivers/reset/reset-airoha.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Based on Linux drivers/clk/clk-en7523.c reworked
+ * and detached to a dedicated driver
+ *
+ * Author: Lorenzo Bianconi <lorenzo at kernel.org> (original driver)
+ * Christian Marangi <ansuelsmth at gmail.com>
+ */
+
+#include <dm.h>
+#include <linux/io.h>
+#include <reset-uclass.h>
+
+#include <dt-bindings/reset/airoha,en7581-reset.h>
+
+#define RST_NR_PER_BANK 32
+
+#define REG_RESET_CONTROL2 0x830
+#define REG_RESET_CONTROL1 0x834
+
+struct airoha_reset_priv {
+ const u16 *bank_ofs;
+ const u16 *idx_map;
+ void __iomem *base;
+};
+
+static const u16 en7581_rst_ofs[] = {
+ REG_RESET_CONTROL2,
+ REG_RESET_CONTROL1,
+};
+
+static const u16 en7581_rst_map[] = {
+ /* RST_CTRL2 */
+ [EN7581_XPON_PHY_RST] = 0,
+ [EN7581_CPU_TIMER2_RST] = 2,
+ [EN7581_HSUART_RST] = 3,
+ [EN7581_UART4_RST] = 4,
+ [EN7581_UART5_RST] = 5,
+ [EN7581_I2C2_RST] = 6,
+ [EN7581_XSI_MAC_RST] = 7,
+ [EN7581_XSI_PHY_RST] = 8,
+ [EN7581_NPU_RST] = 9,
+ [EN7581_I2S_RST] = 10,
+ [EN7581_TRNG_RST] = 11,
+ [EN7581_TRNG_MSTART_RST] = 12,
+ [EN7581_DUAL_HSI0_RST] = 13,
+ [EN7581_DUAL_HSI1_RST] = 14,
+ [EN7581_HSI_RST] = 15,
+ [EN7581_DUAL_HSI0_MAC_RST] = 16,
+ [EN7581_DUAL_HSI1_MAC_RST] = 17,
+ [EN7581_HSI_MAC_RST] = 18,
+ [EN7581_WDMA_RST] = 19,
+ [EN7581_WOE0_RST] = 20,
+ [EN7581_WOE1_RST] = 21,
+ [EN7581_HSDMA_RST] = 22,
+ [EN7581_TDMA_RST] = 24,
+ [EN7581_EMMC_RST] = 25,
+ [EN7581_SOE_RST] = 26,
+ [EN7581_PCIE2_RST] = 27,
+ [EN7581_XFP_MAC_RST] = 28,
+ [EN7581_USB_HOST_P1_RST] = 29,
+ [EN7581_USB_HOST_P1_U3_PHY_RST] = 30,
+ /* RST_CTRL1 */
+ [EN7581_PCM1_ZSI_ISI_RST] = RST_NR_PER_BANK + 0,
+ [EN7581_FE_PDMA_RST] = RST_NR_PER_BANK + 1,
+ [EN7581_FE_QDMA_RST] = RST_NR_PER_BANK + 2,
+ [EN7581_PCM_SPIWP_RST] = RST_NR_PER_BANK + 4,
+ [EN7581_CRYPTO_RST] = RST_NR_PER_BANK + 6,
+ [EN7581_TIMER_RST] = RST_NR_PER_BANK + 8,
+ [EN7581_PCM1_RST] = RST_NR_PER_BANK + 11,
+ [EN7581_UART_RST] = RST_NR_PER_BANK + 12,
+ [EN7581_GPIO_RST] = RST_NR_PER_BANK + 13,
+ [EN7581_GDMA_RST] = RST_NR_PER_BANK + 14,
+ [EN7581_I2C_MASTER_RST] = RST_NR_PER_BANK + 16,
+ [EN7581_PCM2_ZSI_ISI_RST] = RST_NR_PER_BANK + 17,
+ [EN7581_SFC_RST] = RST_NR_PER_BANK + 18,
+ [EN7581_UART2_RST] = RST_NR_PER_BANK + 19,
+ [EN7581_GDMP_RST] = RST_NR_PER_BANK + 20,
+ [EN7581_FE_RST] = RST_NR_PER_BANK + 21,
+ [EN7581_USB_HOST_P0_RST] = RST_NR_PER_BANK + 22,
+ [EN7581_GSW_RST] = RST_NR_PER_BANK + 23,
+ [EN7581_SFC2_PCM_RST] = RST_NR_PER_BANK + 25,
+ [EN7581_PCIE0_RST] = RST_NR_PER_BANK + 26,
+ [EN7581_PCIE1_RST] = RST_NR_PER_BANK + 27,
+ [EN7581_CPU_TIMER_RST] = RST_NR_PER_BANK + 28,
+ [EN7581_PCIE_HB_RST] = RST_NR_PER_BANK + 29,
+ [EN7581_XPON_MAC_RST] = RST_NR_PER_BANK + 31,
+};
+
+static int airoha_reset_update(struct airoha_reset_priv *priv,
+ unsigned long id, bool assert)
+{
+ void __iomem *addr = priv->base + priv->bank_ofs[id / RST_NR_PER_BANK];
+ u32 val;
+
+ val = readl(addr);
+ if (assert)
+ val |= BIT(id % RST_NR_PER_BANK);
+ else
+ val &= ~BIT(id % RST_NR_PER_BANK);
+ writel(val, addr);
+
+ return 0;
+}
+
+static int airoha_reset_assert(struct reset_ctl *reset_ctl)
+{
+ struct airoha_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int id = reset_ctl->id;
+
+ return airoha_reset_update(priv, id, true);
+}
+
+static int airoha_reset_deassert(struct reset_ctl *reset_ctl)
+{
+ struct airoha_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int id = reset_ctl->id;
+
+ return airoha_reset_update(priv, id, false);
+}
+
+static int airoha_reset_status(struct reset_ctl *reset_ctl)
+{
+ struct airoha_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ int id = reset_ctl->id;
+ void __iomem *addr;
+
+ addr = priv->base + priv->bank_ofs[id / RST_NR_PER_BANK];
+
+ return !!(readl(addr) & BIT(id % RST_NR_PER_BANK));
+}
+
+static int airoha_reset_xlate(struct reset_ctl *reset_ctl,
+ struct ofnode_phandle_args *args)
+{
+ struct airoha_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+
+ if (args->args[0] >= ARRAY_SIZE(en7581_rst_map))
+ return -EINVAL;
+
+ reset_ctl->id = priv->idx_map[args->args[0]];
+
+ return 0;
+}
+
+static struct reset_ops airoha_reset_ops = {
+ .of_xlate = airoha_reset_xlate,
+ .rst_assert = airoha_reset_assert,
+ .rst_deassert = airoha_reset_deassert,
+ .rst_status = airoha_reset_status,
+};
+
+static int airoha_reset_probe(struct udevice *dev)
+{
+ struct airoha_reset_priv *priv = dev_get_priv(dev);
+
+ priv->base = dev_remap_addr(dev);
+ if (!priv->base)
+ return -ENOMEM;
+
+ priv->bank_ofs = en7581_rst_ofs;
+ priv->idx_map = en7581_rst_map;
+
+ return 0;
+}
+
+U_BOOT_DRIVER(airoha_reset) = {
+ .name = "airoha-reset",
+ .id = UCLASS_RESET,
+ .probe = airoha_reset_probe,
+ .ops = &airoha_reset_ops,
+ .priv_auto = sizeof(struct airoha_reset_priv),
+};
diff --git a/include/dt-bindings/reset/airoha,en7581-reset.h b/include/dt-bindings/reset/airoha,en7581-reset.h
new file mode 100644
index 00000000000..ac4a3fee4c3
--- /dev/null
+++ b/include/dt-bindings/reset/airoha,en7581-reset.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2024 AIROHA Inc
+ * Author: Lorenzo Bianconi <lorenzo at kernel.org>
+ */
+
+#ifndef __DT_BINDINGS_RESET_CONTROLLER_AIROHA_EN7581_H_
+#define __DT_BINDINGS_RESET_CONTROLLER_AIROHA_EN7581_H_
+
+/* RST_CTRL2 */
+#define EN7581_XPON_PHY_RST 0
+#define EN7581_CPU_TIMER2_RST 1
+#define EN7581_HSUART_RST 2
+#define EN7581_UART4_RST 3
+#define EN7581_UART5_RST 4
+#define EN7581_I2C2_RST 5
+#define EN7581_XSI_MAC_RST 6
+#define EN7581_XSI_PHY_RST 7
+#define EN7581_NPU_RST 8
+#define EN7581_I2S_RST 9
+#define EN7581_TRNG_RST 10
+#define EN7581_TRNG_MSTART_RST 11
+#define EN7581_DUAL_HSI0_RST 12
+#define EN7581_DUAL_HSI1_RST 13
+#define EN7581_HSI_RST 14
+#define EN7581_DUAL_HSI0_MAC_RST 15
+#define EN7581_DUAL_HSI1_MAC_RST 16
+#define EN7581_HSI_MAC_RST 17
+#define EN7581_WDMA_RST 18
+#define EN7581_WOE0_RST 19
+#define EN7581_WOE1_RST 20
+#define EN7581_HSDMA_RST 21
+#define EN7581_TDMA_RST 22
+#define EN7581_EMMC_RST 23
+#define EN7581_SOE_RST 24
+#define EN7581_PCIE2_RST 25
+#define EN7581_XFP_MAC_RST 26
+#define EN7581_USB_HOST_P1_RST 27
+#define EN7581_USB_HOST_P1_U3_PHY_RST 28
+/* RST_CTRL1 */
+#define EN7581_PCM1_ZSI_ISI_RST 29
+#define EN7581_FE_PDMA_RST 30
+#define EN7581_FE_QDMA_RST 31
+#define EN7581_PCM_SPIWP_RST 32
+#define EN7581_CRYPTO_RST 33
+#define EN7581_TIMER_RST 34
+#define EN7581_PCM1_RST 35
+#define EN7581_UART_RST 36
+#define EN7581_GPIO_RST 37
+#define EN7581_GDMA_RST 38
+#define EN7581_I2C_MASTER_RST 39
+#define EN7581_PCM2_ZSI_ISI_RST 40
+#define EN7581_SFC_RST 41
+#define EN7581_UART2_RST 42
+#define EN7581_GDMP_RST 43
+#define EN7581_FE_RST 44
+#define EN7581_USB_HOST_P0_RST 45
+#define EN7581_GSW_RST 46
+#define EN7581_SFC2_PCM_RST 47
+#define EN7581_PCIE0_RST 48
+#define EN7581_PCIE1_RST 49
+#define EN7581_CPU_TIMER_RST 50
+#define EN7581_PCIE_HB_RST 51
+#define EN7581_XPON_MAC_RST 52
+
+#endif /* __DT_BINDINGS_RESET_CONTROLLER_AIROHA_EN7581_H_ */
--
2.48.1
More information about the U-Boot
mailing list