Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752932AbbHJDXe (ORCPT ); Sun, 9 Aug 2015 23:23:34 -0400 Received: from mail-qg0-f47.google.com ([209.85.192.47]:33282 "EHLO mail-qg0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752706AbbHJDXH (ORCPT ); Sun, 9 Aug 2015 23:23:07 -0400 From: Shunqian Zheng To: srinivas.kandagatla@linaro.org, maxime.ripard@free-electrons.com, heiko@sntech.de, linux-kernel@vger.kernel.org, caesar.wang@rock-chips.com Cc: dianders@chromium.org, linux-rockchip@lists.infradead.org, xjq@rock-chips.com, ZhengShunQian Subject: [PATCH 2/3] nvmem: rockchip-efuse: implement eFuse driver Date: Mon, 10 Aug 2015 11:22:42 +0800 Message-Id: <1439176963-8969-3-git-send-email-zhengsq@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1439176963-8969-1-git-send-email-zhengsq@rock-chips.com> References: <1439176963-8969-1-git-send-email-zhengsq@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8163 Lines: 284 From: ZhengShunQian There are some SoC specified values store in eFuse, such as the cpu_leakage and cpu_version, this driver can expose these values to /sys base on nvmem. Also add the docs of efuse bindings and the rk3288's efuse config. Signed-off-by: Caesar Wang Signed-off-by: ZhengShunQian --- .../devicetree/bindings/nvmem/rockchip-efuse.txt | 36 +++++ arch/arm/boot/dts/rk3288.dtsi | 13 ++ drivers/nvmem/Kconfig | 10 ++ drivers/nvmem/Makefile | 2 + drivers/nvmem/rockchip-efuse.c | 155 +++++++++++++++++++++ 5 files changed, 216 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt create mode 100644 drivers/nvmem/rockchip-efuse.c diff --git a/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt new file mode 100644 index 0000000..bb487ec --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/rockchip-efuse.txt @@ -0,0 +1,36 @@ += Rockchip eFuse device tree bindings = + +Required properties: +- compatible: Should be "rockchip,rockchip-efuse" +- reg: Should contain the registers location and exact eFuse size + += Data cells = +Are child nodes of eFuse, bindings of which as described in +bindings/nvmem/nvmem.txt + +Example: + + efuse: efuse@ffb40000 { + compatible = "rockchip,rockchip-efuse"; + reg = <0xffb40000 0x20>; + #address-cells = <1>; + #size-cells = <1>; + clocks = <&cru PCLK_EFUSE256>; + clock-names = "pclk_efuse_256"; + + /* Data cells */ + cpu_leakage: cpu_leakage { + reg = <0x17 0x1>; + }; + }; + += Data consumers = +Are device nodes which consume nvmem data cells. + +Example: + + cpu_leakage { + ... + nvmem-cells = <&cpu_leakage>; + nvmem-cell-names = "cpu_leakage"; + }; diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi index 2db91c9..272c0b5 100644 --- a/arch/arm/boot/dts/rk3288.dtsi +++ b/arch/arm/boot/dts/rk3288.dtsi @@ -749,6 +749,19 @@ interrupts = ; }; + efuse: efuse@ffb40000 { + compatible = "rockchip,rockchip-efuse"; + reg = <0xffb40000 0x20>; + #address-cells = <1>; + #size-cells = <1>; + clocks = <&cru PCLK_EFUSE256>; + clock-names = "pclk_efuse_256"; + + cpu_leakage: cpu_leakage { + reg = <0x17 0x1>; + }; + }; + usbphy: phy { compatible = "rockchip,rk3288-usb-phy"; rockchip,grf = <&grf>; diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 8db2978..98f1fac 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -36,4 +36,14 @@ config NVMEM_SUNXI_SID This driver can also be built as a module. If so, the module will be called nvmem_sunxi_sid. +config ROCKCHIP_EFUSE + tristate "Rockchip eFuse Support" + depends on ARCH_ROCKCHIP || COMPILE_TEST + help + This is a simple drive to dump specified values of Rockchip SoC + from eFuse, such as cpu-leakage. + + This driver can also be built as a module. If so, the module + will be called nvmem_rockchip_efuse. + endif diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 4328b93..093a528 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -10,3 +10,5 @@ obj-$(CONFIG_QCOM_QFPROM) += nvmem_qfprom.o nvmem_qfprom-y := qfprom.o obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o nvmem_sunxi_sid-y := sunxi_sid.o +obj-$(CONFIG_ROCKCHIP_EFUSE) += nvmem_rockchip_efuse.o +nvmem_rockchip_efuse-y := rockchip-efuse.o diff --git a/drivers/nvmem/rockchip-efuse.c b/drivers/nvmem/rockchip-efuse.c new file mode 100644 index 0000000..30ee772 --- /dev/null +++ b/drivers/nvmem/rockchip-efuse.c @@ -0,0 +1,155 @@ +/* + * Rockchip eFuse Driver + * + * Copyright (c) 2015 Rockchip Electronics Co. Ltd. + * Author: Caesar Wang + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define EFUSE_A_SHIFT 6 +#define EFUSE_A_MASK 0x3ff +#define EFUSE_PGENB BIT(3) +#define EFUSE_LOAD BIT(2) +#define EFUSE_STROBE BIT(1) +#define EFUSE_CSB BIT(0) + +#define REG_EFUSE_CTRL 0x0000 +#define REG_EFUSE_DOUT 0x0004 + +static int rockchip_efuse_write(void *context, const void *data, size_t count) +{ + /* Nothing TBD, Read-Only */ + return 0; +} + +static int rockchip_efuse_read(void *context, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + unsigned int offset = *(u32 *)reg; + void __iomem *base = context; + u8 *buf = val; + + writel(EFUSE_LOAD | EFUSE_PGENB, base + REG_EFUSE_CTRL); + udelay(1); + while (val_size) { + writel(readl(base + REG_EFUSE_CTRL) & + (~(EFUSE_A_MASK << EFUSE_A_SHIFT)), + base + REG_EFUSE_CTRL); + writel(readl(base + REG_EFUSE_CTRL) | + ((offset & EFUSE_A_MASK) << EFUSE_A_SHIFT), + base + REG_EFUSE_CTRL); + udelay(1); + writel(readl(base + REG_EFUSE_CTRL) | + EFUSE_STROBE, base + REG_EFUSE_CTRL); + udelay(1); + *buf++ = readb(base + REG_EFUSE_DOUT); + writel(readl(base + REG_EFUSE_CTRL) & + (~EFUSE_STROBE), base + REG_EFUSE_CTRL); + udelay(1); + + val_size -= 1; + offset += 1; + } + + /* Switch to standby mode */ + writel(EFUSE_PGENB | EFUSE_CSB, base + REG_EFUSE_CTRL); + + return 0; +} + +static struct regmap_bus rockchip_efuse_bus = { + .read = rockchip_efuse_read, + .write = rockchip_efuse_write, + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, +}; + +struct regmap_config rockchip_efuse_regmap_config = { + .reg_bits = 32, + .reg_stride = 1, + .val_bits = 8, +}; + +static struct nvmem_config econfig = { + .name = "rockchip-efuse", + .owner = THIS_MODULE, + .read_only = true, +}; + +static const struct of_device_id rockchip_efuse_match[] = { + { .compatible = "rockchip,rockchip-efuse",}, + { /* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, rockchip_efuse_match); + +int rockchip_efuse_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + struct nvmem_device *nvmem; + struct regmap *regmap; + void __iomem *base; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + + if (IS_ERR(base)) + return PTR_ERR(base); + + rockchip_efuse_regmap_config.max_register = resource_size(res) - 1; + + regmap = devm_regmap_init(dev, &rockchip_efuse_bus, + base, &rockchip_efuse_regmap_config); + if (IS_ERR(regmap)) { + dev_err(dev, "regmap init failed\n"); + return PTR_ERR(regmap); + } + econfig.dev = dev; + nvmem = nvmem_register(&econfig); + if (IS_ERR(nvmem)) + return PTR_ERR(nvmem); + + platform_set_drvdata(pdev, nvmem); + + return 0; +} + +int rockchip_efuse_remove(struct platform_device *pdev) +{ + struct nvmem_device *nvmem = platform_get_drvdata(pdev); + + return nvmem_unregister(nvmem); +} + +static struct platform_driver rockchip_efuse_driver = { + .probe = rockchip_efuse_probe, + .remove = rockchip_efuse_remove, + .driver = { + .name = "rockchip-efuse", + .of_match_table = rockchip_efuse_match, + }, +}; + +module_platform_driver(rockchip_efuse_driver); +MODULE_DESCRIPTION("rockchip_efuse driver"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/