Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753524AbbF2L0F (ORCPT ); Mon, 29 Jun 2015 07:26:05 -0400 Received: from mail-pd0-f172.google.com ([209.85.192.172]:33682 "EHLO mail-pd0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753078AbbF2LZz (ORCPT ); Mon, 29 Jun 2015 07:25:55 -0400 From: Sanchayan Maity To: linux-arm-kernel@lists.infradead.org Cc: srinivas.kandagatla@linaro.org, maxime.ripard@free-electrons.com, shawn.guo@linaro.org, kernel@pengutronix.de, stefan@agner.ch, stefan.wahren@i2se.com, linux-kernel@vger.kernel.org, Sanchayan Maity Subject: [RFC PATCH v6 3/3] drivers: nvmem: Add Vybrid OCOTP support Date: Mon, 29 Jun 2015 16:52:19 +0530 Message-Id: <9593ca1f925aff20a6671262efd2f45e256ea676.1435574288.git.maitysanchayan@gmail.com> X-Mailer: git-send-email 2.4.4 In-Reply-To: References: <558A99FC.2070902@i2se.com> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8856 Lines: 304 The patch adds support for the On Chip One Time Programmable Peripheral (OCOTP) on the Vybrid platform. Signed-off-by: Sanchayan Maity --- drivers/nvmem/Kconfig | 10 ++ drivers/nvmem/Makefile | 2 + drivers/nvmem/vf610-ocotp.c | 250 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 262 insertions(+) create mode 100644 drivers/nvmem/vf610-ocotp.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 17f1a57..84c830d 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -33,4 +33,14 @@ config NVMEM_SUNXI_SID This driver can also be built as a module. If so, the module will be called eeprom-sunxi-sid. +config NVMEM_VF610_OCOTP + tristate "VF610 SoCs OCOTP support" + depends on SOC_VF610 + help + This is a driver for the 'OCOTP' available on various Vybrid + devices. + + This driver can also be built as a module. If so, the module + will be called nvmem-vf610-ocotp. + endif diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index cc46791..a9ed113 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -11,3 +11,5 @@ 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_NVMEM_VF610_OCOTP) += nvmem-vf610-ocotp.o +nvmem-vf610-ocotp-y := vf610-ocotp.o diff --git a/drivers/nvmem/vf610-ocotp.c b/drivers/nvmem/vf610-ocotp.c new file mode 100644 index 0000000..b7a782c --- /dev/null +++ b/drivers/nvmem/vf610-ocotp.c @@ -0,0 +1,250 @@ +/* + * Copyright (C) 2015 Sanchayan Maity + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 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 + +/* OCOTP Register Offsets */ +#define OCOTP_CTRL_REG 0x00 +#define OCOTP_CTRL_SET 0x04 +#define OCOTP_CTRL_CLR 0x08 +#define OCOTP_TIMING 0x10 +#define OCOTP_DATA 0x20 +#define OCOTP_READ_CTRL_REG 0x30 +#define OCOTP_READ_FUSE_DATA 0x40 + +/* OCOTP Register bits and masks */ +#define OCOTP_CTRL_WR_UNLOCK 16 +#define OCOTP_CTRL_WR_UNLOCK_KEY 0x3E77 +#define OCOTP_CTRL_WR_UNLOCK_MASK 0xFFFF0000 +#define OCOTP_CTRL_ADDR 0 +#define OCOTP_CTRL_ADDR_MASK 0x7F +#define OCOTP_CTRL_RELOAD_SHADOWS (0x1 << 10) +#define OCOTP_CTRL_ERROR (0x1 << 9) +#define OCOTP_CTRL_BUSY (0x1 << 8) + +#define OCOTP_TIMING_STROBE_READ 16 +#define OCOTP_TIMING_STROBE_READ_MASK 0x003F0000 +#define OCOTP_TIMING_RELAX 12 +#define OCOTP_TIMING_RELAX_MASK 0x0000F000 +#define OCOTP_TIMING_STROBE_PROG 0 +#define OCOTP_TIMING_STROBE_PROG_MASK 0x00000FFF + +#define OCOTP_READ_CTRL_READ_FUSE 0x1 + +#define VF610_OCOTP_TIMEOUT 100000 + +#define BF(value, field) (((value) << field) & field##_MASK) + +#define DEF_RELAX 20 + +struct vf610_ocotp_dev { + void __iomem *base; + struct clk *clk; + struct device *dev; + struct resource *res; + struct regmap *regmap; + struct nvmem_device *nvmem; +}; + +static int ocotp_timing; + +static u8 valid_fuse_addr[] = { + 0x00, 0x01, 0x02, 0x04, 0x0F, 0x20, 0x21, 0x22, 0x23, 0x24, + 0x25, 0x26, 0x27, 0x28, 0x2F, 0x38, 0x39, 0x3A, 0x3B, 0x3C, + 0x3D, 0x3E, 0x3F +}; + +static int vf610_ocotp_wait_busy(void __iomem *base) +{ + int timeout = VF610_OCOTP_TIMEOUT; + + while ((readl(base) & OCOTP_CTRL_BUSY) && --timeout) + udelay(10); + + if (!timeout) { + writel(OCOTP_CTRL_ERROR, base + OCOTP_CTRL_CLR); + return -ETIMEDOUT; + } + + udelay(10); + + return 0; +} + +static int vf610_ocotp_calculate_timing(struct vf610_ocotp_dev *ocotp_dev) +{ + u32 clk_rate; + u32 relax, strobe_read, strobe_prog; + u32 timing; + + clk_rate = clk_get_rate(ocotp_dev->clk); + + relax = clk_rate / (1000000000 / DEF_RELAX) - 1; + strobe_prog = clk_rate / (1000000000 / 10000) + 2 * (DEF_RELAX + 1) - 1; + strobe_read = clk_rate / (1000000000 / 40) + 2 * (DEF_RELAX + 1) - 1; + + timing = BF(relax, OCOTP_TIMING_RELAX); + timing |= BF(strobe_read, OCOTP_TIMING_STROBE_READ); + timing |= BF(strobe_prog, OCOTP_TIMING_STROBE_PROG); + + return timing; +} + +static int vf610_ocotp_set_timing(void __iomem *base, int timing) +{ + writel(timing, base + OCOTP_TIMING); + + return 0; +} + +static int vf610_ocotp_write(void *context, const void *data, size_t count) +{ + return 0; +} + +static int vf610_ocotp_read(void *context, + const void *offset, size_t reg_size, + void *val, size_t val_size) +{ + void __iomem *ocotp_base = context; + u32 *buf = val; + u32 reg; + int ret; + int i; + + for (i = 0; i < ARRAY_SIZE(valid_fuse_addr); i++) { + vf610_ocotp_set_timing(ocotp_base, ocotp_timing); + ret = vf610_ocotp_wait_busy(ocotp_base + OCOTP_CTRL_REG); + if (ret) + return ret; + + reg = readl(ocotp_base + OCOTP_CTRL_REG); + reg &= ~OCOTP_CTRL_ADDR_MASK; + reg &= ~OCOTP_CTRL_WR_UNLOCK_MASK; + reg |= BF(valid_fuse_addr[i], OCOTP_CTRL_ADDR); + writel(reg, ocotp_base + OCOTP_CTRL_REG); + + writel(OCOTP_READ_CTRL_READ_FUSE, + ocotp_base + OCOTP_READ_CTRL_REG); + ret = vf610_ocotp_wait_busy(ocotp_base + OCOTP_CTRL_REG); + if (ret) + return ret; + + if (readl(ocotp_base) & OCOTP_CTRL_ERROR) { + pr_err("Error reading from fuse address %d\n", + valid_fuse_addr[i]); + writel(OCOTP_CTRL_ERROR, ocotp_base + OCOTP_CTRL_CLR); + } + + *buf++ = readl(ocotp_base + OCOTP_READ_FUSE_DATA); + } + + return 0; +} + +static struct regmap_bus vf610_ocotp_bus = { + .read = vf610_ocotp_read, + .write = vf610_ocotp_write, + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, +}; + +static struct regmap_config ocotp_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + +static struct nvmem_config ocotp_config = { + .name = "ocotp", + .owner = THIS_MODULE, +}; + +static const struct of_device_id ocotp_of_match[] = { + { .compatible = "fsl,vf610-ocotp",}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, ocotp_of_match); + +static int vf610_ocotp_remove(struct platform_device *pdev) +{ + struct vf610_ocotp_dev *ocotp_dev = platform_get_drvdata(pdev); + + return nvmem_unregister(ocotp_dev->nvmem); +} + +static int vf610_ocotp_probe(struct platform_device *pdev) +{ + struct vf610_ocotp_dev *ocotp_dev; + + ocotp_dev = devm_kzalloc(&pdev->dev, + sizeof(struct vf610_ocotp_dev), GFP_KERNEL); + if (!ocotp_dev) + return -ENOMEM; + + ocotp_dev->dev = &pdev->dev; + + ocotp_dev->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ocotp_dev->base = devm_ioremap_resource(ocotp_dev->dev, ocotp_dev->res); + if (IS_ERR(ocotp_dev->base)) + return PTR_ERR(ocotp_dev->base); + + ocotp_dev->clk = devm_clk_get(ocotp_dev->dev, "ocotp"); + if (IS_ERR(ocotp_dev->clk)) { + dev_err(ocotp_dev->dev, "failed getting clock, err = %ld\n", + PTR_ERR(ocotp_dev->clk)); + return PTR_ERR(ocotp_dev->clk); + } + + ocotp_regmap_config.max_register = resource_size(ocotp_dev->res) - 1; + + ocotp_dev->regmap = devm_regmap_init(ocotp_dev->dev, + &vf610_ocotp_bus, ocotp_dev->base, &ocotp_regmap_config); + if (IS_ERR(ocotp_dev->regmap)) { + dev_err(ocotp_dev->dev, "regmap init failed\n"); + return PTR_ERR(ocotp_dev->regmap); + } + ocotp_config.dev = ocotp_dev->dev; + + ocotp_dev->nvmem = nvmem_register(&ocotp_config); + if (IS_ERR(ocotp_dev->nvmem)) + return PTR_ERR(ocotp_dev->nvmem); + + platform_set_drvdata(pdev, ocotp_dev); + + ocotp_timing = vf610_ocotp_calculate_timing(ocotp_dev); + + return 0; +} + +static struct platform_driver vf610_ocotp_driver = { + .probe = vf610_ocotp_probe, + .remove = vf610_ocotp_remove, + .driver = { + .name = "vf610-ocotp", + .of_match_table = ocotp_of_match, + }, +}; +module_platform_driver(vf610_ocotp_driver); +MODULE_AUTHOR("Sanchayan Maity "); +MODULE_DESCRIPTION("Vybrid OCOTP driver"); +MODULE_LICENSE("GPL v2"); -- 2.4.4 -- 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/