[PATCH 4/7] reset: aspeed: Add AST2600 reset support

Chia-Wei, Wang
2020-12-14T05:54:26Z

Add controller reset support through the
System Control Unit (SCU) of AST2600 SoC.

Signed-off-by: Chia-Wei, Wang <chiawei_wang@aspeedtech.com>
---
drivers/reset/Kconfig | 9 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-ast2600.c | 108 ++++++++++++++++++++++
include/dt-bindings/reset/ast2600-reset.h | 70 ++++++++++++++
4 files changed, 188 insertions(+)
create mode 100644 drivers/reset/reset-ast2600.c
create mode 100644 include/dt-bindings/reset/ast2600-reset.h

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 33c2736554..f5b3f8826f 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -81,6 +81,15 @@ config RESET_AST2500
Say Y if you want to control reset signals of different peripherals
through System Control Unit (SCU).

+config RESET_AST2600
+ bool "Reset controller driver for AST2600 SoCs"
+ depends on DM_RESET
+ default y if ASPEED_AST2600
+ help
+ Support for reset controller on AST2600 SoC.
+ Say Y if you want to control reset signals of different peripherals
+ through System Control Unit (SCU).
+
config RESET_ROCKCHIP
bool "Reset controller driver for Rockchip SoCs"
depends on DM_RESET && ARCH_ROCKCHIP && CLK
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index fa52aa3329..8a0f528076 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_AST2500) += reset-ast2500.o
+obj-$(CONFIG_RESET_AST2600) += reset-ast2600.o
obj-$(CONFIG_RESET_ROCKCHIP) += reset-rockchip.o
obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_SOCFPGA) += reset-socfpga.o
diff --git a/drivers/reset/reset-ast2600.c b/drivers/reset/reset-ast2600.c
new file mode 100644
index 0000000000..c402968fa8
--- /dev/null
+++ b/drivers/reset/reset-ast2600.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2020 ASPEED Technology Inc.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <log.h>
+#include <misc.h>
+#include <reset.h>
+#include <reset-uclass.h>
+#include <linux/err.h>
+#include <asm/io.h>
+#include <asm/arch/scu_ast2600.h>
+
+struct ast2600_reset_priv {
+ struct ast2600_scu *scu;
+};
+
+static int ast2600_reset_request(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 ast2600_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 ast2600_reset_assert(struct reset_ctl *reset_ctl)
+{
+ struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ struct ast2600_scu *scu = priv->scu;
+
+ debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id);
+
+ if (reset_ctl->id < 32)
+ writel(BIT(reset_ctl->id), scu->modrst_ctrl1);
+ else
+ writel(BIT(reset_ctl->id - 32), scu->modrst_ctrl2);
+
+ return 0;
+}
+
+static int ast2600_reset_deassert(struct reset_ctl *reset_ctl)
+{
+ struct ast2600_reset_priv *priv = dev_get_priv(reset_ctl->dev);
+ struct ast2600_scu *scu = priv->scu;
+
+ debug("%s: reset_ctl->id: %lu\n", __func__, reset_ctl->id);
+
+ if (reset_ctl->id < 32)
+ writel(BIT(reset_ctl->id), scu->modrst_clr1);
+ else
+ writel(BIT(reset_ctl->id - 32), scu->modrst_clr2);
+
+ return 0;
+}
+
+static int ast2600_reset_probe(struct udevice *dev)
+{
+ int rc;
+ struct ast2600_reset_priv *priv = dev_get_priv(dev);
+ struct udevice *scu_dev;
+
+ /* get SCU base from clock device */
+ rc = uclass_get_device_by_driver(UCLASS_CLK,
+ DM_GET_DRIVER(aspeed_ast2600_scu), &scu_dev);
+ if (rc) {
+ debug("%s: clock device not found, rc=%d\n", __func__, rc);
+ return rc;
+ }
+
+ priv->scu = devfdt_get_addr_ptr(scu_dev);
+ if (IS_ERR_OR_NULL(priv->scu)) {
+ debug("%s: invalid SCU base pointer\n", __func__);
+ return PTR_ERR(priv->scu);
+ }
+
+ return 0;
+}
+
+static const struct udevice_id ast2600_reset_ids[] = {
+ { .compatible = "aspeed,ast2600-reset" },
+ { }
+};
+
+struct reset_ops ast2600_reset_ops = {
+ .request = ast2600_reset_request,
+ .rfree = ast2600_reset_free,
+ .rst_assert = ast2600_reset_assert,
+ .rst_deassert = ast2600_reset_deassert,
+};
+
+U_BOOT_DRIVER(ast2600_reset) = {
+ .name = "ast2600_reset",
+ .id = UCLASS_RESET,
+ .of_match = ast2600_reset_ids,
+ .probe = ast2600_reset_probe,
+ .ops = &ast2600_reset_ops,
+ .priv_auto_alloc_size = sizeof(struct ast2600_reset_priv),
+};
diff --git a/include/dt-bindings/reset/ast2600-reset.h b/include/dt-bindings/reset/ast2600-reset.h
new file mode 100644
index 0000000000..b6d0f79917
--- /dev/null
+++ b/include/dt-bindings/reset/ast2600-reset.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) ASPEED Technology Inc.
+ */
+
+#ifndef _ABI_MACH_ASPEED_AST2600_RESET_H_
+#define _ABI_MACH_ASPEED_AST2600_RESET_H_
+
+#define ASPEED_RESET_FSI (59)
+#define ASPEED_RESET_RESERVED58 (58)
+#define ASPEED_RESET_RESERVED57 (57)
+#define ASPEED_RESET_SD (56)
+#define ASPEED_RESET_ADC (55)
+#define ASPEED_RESET_JTAG_MASTER2 (54)
+#define ASPEED_RESET_MAC4 (53)
+#define ASPEED_RESET_MAC3 (52)
+#define ASPEED_RESET_RESERVE51 (51)
+#define ASPEED_RESET_RESERVE50 (50)
+#define ASPEED_RESET_RESERVE49 (49)
+#define ASPEED_RESET_RESERVE48 (48)
+#define ASPEED_RESET_RESERVE47 (47)
+#define ASPEED_RESET_RESERVE46 (46)
+#define ASPEED_RESET_I3C5 (45)
+#define ASPEED_RESET_I3C4 (44)
+#define ASPEED_RESET_I3C3 (43)
+#define ASPEED_RESET_I3C2 (42)
+#define ASPEED_RESET_I3C1 (41)
+#define ASPEED_RESET_I3C0 (40)
+#define ASPEED_RESET_I3C_DMA (39)
+#define ASPEED_RESET_RESERVED38 (38)
+#define ASPEED_RESET_PWM (37)
+#define ASPEED_RESET_PECI (36)
+#define ASPEED_RESET_MII (35)
+#define ASPEED_RESET_I2C (34)
+#define ASPEED_RESET_RESERVED33 (33)
+#define ASPEED_RESET_LPC_ESPI (32)
+#define ASPEED_RESET_H2X (31)
+#define ASPEED_RESET_GP_MCU (30)
+#define ASPEED_RESET_DP_MCU (29)
+#define ASPEED_RESET_DP (28)
+#define ASPEED_RESET_RC_XDMA (27)
+#define ASPEED_RESET_GRAPHICS (26)
+#define ASPEED_RESET_DEV_XDMA (25)
+#define ASPEED_RESET_DEV_MCTP (24)
+#define ASPEED_RESET_RC_MCTP (23)
+#define ASPEED_RESET_JTAG_MASTER (22)
+#define ASPEED_RESET_PCIE_DEV_OE (21)
+#define ASPEED_RESET_PCIE_DEV_O (20)
+#define ASPEED_RESET_PCIE_RC_OE (19)
+#define ASPEED_RESET_PCIE_RC_O (18)
+#define ASPEED_RESET_RESERVED17 (17)
+#define ASPEED_RESET_EMMC (16)
+#define ASPEED_RESET_UHCI (15)
+#define ASPEED_RESET_EHCI_P1 (14)
+#define ASPEED_RESET_CRT (13)
+#define ASPEED_RESET_MAC2 (12)
+#define ASPEED_RESET_MAC1 (11)
+#define ASPEED_RESET_RESERVED10 (10)
+#define ASPEED_RESET_RVAS (9)
+#define ASPEED_RESET_PCI_VGA (8)
+#define ASPEED_RESET_2D (7)
+#define ASPEED_RESET_VIDEO (6)
+#define ASPEED_RESET_PCI_DP (5)
+#define ASPEED_RESET_HACE (4)
+#define ASPEED_RESET_EHCI_P2 (3)
+#define ASPEED_RESET_RESERVED2 (2)
+#define ASPEED_RESET_AHB (1)
+#define ASPEED_RESET_SDRAM (0)
+
+#endif /* _ABI_MACH_ASPEED_AST2600_RESET_H_ */
--
2.17.1