[U-Boot,v2,1/2] drivers/reset: support rockchip reset drivers

Message ID	1511852549-15752-1-git-send-email-kever.yang@rock-chips.com
State	Changes Requested
Delegated to:	Philipp Tomsich
Headers	show Return-Path: <u-boot-bounces@lists.denx.de> From: Kever Yang <kever.yang@rock-chips.com> To: u-boot@lists.denx.de Date: Tue, 28 Nov 2017 15:02:28 +0800 Message-Id: <1511852549-15752-1-git-send-email-kever.yang@rock-chips.com> Cc: Elaine Zhang <zhangqing@rock-chips.com> Subject: [U-Boot] [PATCH v2 1/2] drivers/reset: support rockchip reset drivers Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" <u-boot-bounces@lists.denx.de>
Series	[U-Boot,v2,1/2] drivers/reset: support rockchip reset drivers \| expand [U-Boot,v2,1/2] drivers/reset: support rockchip reset drivers [U-Boot,v2,2/2] rockchip: clk: bind reset driver

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), +};

[U-Boot,v2,1/2] drivers/reset: support rockchip reset drivers

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