From 3edba6b47e4265948db3a77a0137157c033d69e2 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Wed, 30 Sep 2015 13:55:47 +0100 Subject: [PATCH] nvmem: imx-ocotp: Add i.MX6 OCOTP driver This driver handles the i.MX On-Chip OTP Controller found in i.MX6Q/D, i.MX6S/DL, i.MX6SL, and i.MX6SX SoCs. Currently it just returns the values stored in the shadow registers. Signed-off-by: Philipp Zabel Acked-by: Srinivas Kandagatla Signed-off-by: Srinivas Kandagatla Signed-off-by: Greg Kroah-Hartman --- drivers/nvmem/Kconfig | 11 ++++ drivers/nvmem/Makefile | 2 + drivers/nvmem/imx-ocotp.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 167 insertions(+) create mode 100644 drivers/nvmem/imx-ocotp.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 1d4f2b4..208a1cb 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -14,6 +14,17 @@ menuconfig NVMEM if NVMEM +config NVMEM_IMX_OCOTP + tristate "i.MX6 On-Chip OTP Controller support" + depends on SOC_IMX6 + help + This is a driver for the On-Chip OTP Controller (OCOTP) available on + i.MX6 SoCs, providing access to 4 Kbits of one-time programmable + eFuses. + + This driver can also be built as a module. If so, the module + will be called nvmem-imx-ocotp. + config QCOM_QFPROM tristate "QCOM QFPROM Support" depends on ARCH_QCOM || COMPILE_TEST diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 3bdcfd4..2ddf0e8 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -6,6 +6,8 @@ obj-$(CONFIG_NVMEM) += nvmem_core.o nvmem_core-y := core.o # Devices +obj-$(CONFIG_NVMEM_IMX_OCOTP) += nvmem-imx-ocotp.o +nvmem-imx-ocotp-y := imx-ocotp.o obj-$(CONFIG_QCOM_QFPROM) += nvmem_qfprom.o nvmem_qfprom-y := qfprom.o obj-$(CONFIG_NVMEM_SUNXI_SID) += nvmem_sunxi_sid.o diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c new file mode 100644 index 0000000..b7971d4 --- /dev/null +++ b/drivers/nvmem/imx-ocotp.c @@ -0,0 +1,154 @@ +/* + * i.MX6 OCOTP fusebox driver + * + * Copyright (c) 2015 Pengutronix, Philipp Zabel + * + * Based on the barebox ocotp driver, + * Copyright (c) 2010 Baruch Siach , + * Orex Computed Radiography + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct ocotp_priv { + struct device *dev; + void __iomem *base; + unsigned int nregs; +}; + +static int imx_ocotp_read(void *context, const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct ocotp_priv *priv = context; + unsigned int offset = *(u32 *)reg; + unsigned int count; + int i; + u32 index; + + index = offset >> 2; + count = val_size >> 2; + + if (count > (priv->nregs - index)) + count = priv->nregs - index; + + for (i = index; i < (index + count); i++) { + *(u32 *)val = readl(priv->base + 0x400 + i * 0x10); + val += 4; + } + + return (i - index) * 4; +} + +static int imx_ocotp_write(void *context, const void *data, size_t count) +{ + /* Not implemented */ + return 0; +} + +static struct regmap_bus imx_ocotp_bus = { + .read = imx_ocotp_read, + .write = imx_ocotp_write, + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, +}; + +static bool imx_ocotp_writeable_reg(struct device *dev, unsigned int reg) +{ + return false; +} + +static struct regmap_config imx_ocotp_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .writeable_reg = imx_ocotp_writeable_reg, + .name = "imx-ocotp", +}; + +static struct nvmem_config imx_ocotp_nvmem_config = { + .name = "imx-ocotp", + .read_only = true, + .owner = THIS_MODULE, +}; + +static const struct of_device_id imx_ocotp_dt_ids[] = { + { .compatible = "fsl,imx6q-ocotp", (void *)128 }, + { .compatible = "fsl,imx6sl-ocotp", (void *)32 }, + { .compatible = "fsl,imx6sx-ocotp", (void *)128 }, + { }, +}; +MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids); + +static int imx_ocotp_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id; + struct device *dev = &pdev->dev; + struct resource *res; + struct regmap *regmap; + struct ocotp_priv *priv; + struct nvmem_device *nvmem; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->base = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + of_id = of_match_device(imx_ocotp_dt_ids, dev); + priv->nregs = (unsigned int)of_id->data; + imx_ocotp_regmap_config.max_register = 4 * priv->nregs - 4; + + regmap = devm_regmap_init(dev, &imx_ocotp_bus, priv, + &imx_ocotp_regmap_config); + if (IS_ERR(regmap)) { + dev_err(dev, "regmap init failed\n"); + return PTR_ERR(regmap); + } + imx_ocotp_nvmem_config.dev = dev; + nvmem = nvmem_register(&imx_ocotp_nvmem_config); + if (IS_ERR(nvmem)) + return PTR_ERR(nvmem); + + platform_set_drvdata(pdev, nvmem); + + return 0; +} + +static int imx_ocotp_remove(struct platform_device *pdev) +{ + struct nvmem_device *nvmem = platform_get_drvdata(pdev); + + return nvmem_unregister(nvmem); +} + +static struct platform_driver imx_ocotp_driver = { + .probe = imx_ocotp_probe, + .remove = imx_ocotp_remove, + .driver = { + .name = "imx_ocotp", + .of_match_table = imx_ocotp_dt_ids, + }, +}; +module_platform_driver(imx_ocotp_driver); + +MODULE_AUTHOR("Philipp Zabel "); +MODULE_DESCRIPTION("i.MX6 OCOTP fuse box driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4