diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 101ced4c84be..b4e937a19e2b 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -36,6 +36,18 @@ config NVMEM_IMX_OCOTP This driver can also be built as a module. If so, the module will be called nvmem-imx-ocotp. +config NVMEM_IMX_SCU_OCOTP + tristate "i.MX8QM On-Chip OTP Controller support" + depends on ARCH_MXC_ARM64|| COMPILE_TEST + depends on HAS_IOMEM + 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 NVMEM_LPC18XX_EEPROM tristate "NXP LPC18XX EEPROM Memory Support" depends on ARCH_LPC18XX || COMPILE_TEST diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index 6f7a77fb3ee7..9ebfab960256 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -13,6 +13,8 @@ obj-$(CONFIG_NVMEM_IMX_IIM) += nvmem-imx-iim.o nvmem-imx-iim-y := imx-iim.o obj-$(CONFIG_NVMEM_IMX_OCOTP) += nvmem-imx-ocotp.o nvmem-imx-ocotp-y := imx-ocotp.o +obj-$(CONFIG_NVMEM_IMX_SCU_OCOTP) += nvmem-imx-scu-ocotp.o +nvmem-imx-scu-ocotp-y := imx-scu-ocotp.o obj-$(CONFIG_NVMEM_LPC18XX_EEPROM) += nvmem_lpc18xx_eeprom.o nvmem_lpc18xx_eeprom-y := lpc18xx_eeprom.o obj-$(CONFIG_NVMEM_LPC18XX_OTP) += nvmem_lpc18xx_otp.o diff --git a/drivers/nvmem/imx-scu-ocotp.c b/drivers/nvmem/imx-scu-ocotp.c new file mode 100644 index 000000000000..8c622df1ca54 --- /dev/null +++ b/drivers/nvmem/imx-scu-ocotp.c @@ -0,0 +1,151 @@ +/* + * 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 +#include + +struct ocotp_priv { + struct device *dev; + unsigned int nregs; + sc_ipc_t nvmem_ipc; +}; + +static int imx_scu_ocotp_read(void *context, unsigned int offset, + void *val, size_t bytes) +{ + struct ocotp_priv *priv = context; + sc_err_t sciErr = SC_ERR_NONE; + unsigned int count; + u32 index; + u32 num_bytes; + int i; + u8 *buf, *p; + + index = offset >> 2; + num_bytes = round_up((offset % 4) + bytes, 4); + count = num_bytes >> 2; + + if (count > (priv->nregs - index)) + count = priv->nregs - index; + + p = kzalloc(num_bytes, GFP_KERNEL); + if (!p) + return -ENOMEM; + + buf = p; + + for (i = index; i < (index + count); i++) { + sciErr = sc_misc_otp_fuse_read(priv->nvmem_ipc, i, (u32 *)buf); + if (sciErr != SC_ERR_NONE) { + kfree(p); + return -EIO; + } + buf += 4; + } + + index = offset % 4; + memcpy(val, &p[index], bytes); + + kfree(p); + + return 0; +} + +static struct nvmem_config imx_scu_ocotp_nvmem_config = { + .name = "imx-ocotp", + .read_only = true, + .word_size = 4, + .stride = 1, + .owner = THIS_MODULE, + .reg_read = imx_scu_ocotp_read, +}; + +static const struct of_device_id imx_scu_ocotp_dt_ids[] = { + { .compatible = "fsl,imx8qm-ocotp", (void *)800 }, + { }, +}; +MODULE_DEVICE_TABLE(of, imx_scu_ocotp_dt_ids); + +static int imx_scu_ocotp_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id; + struct device *dev = &pdev->dev; + struct ocotp_priv *priv; + struct nvmem_device *nvmem; + uint32_t mu_id; + sc_err_t sciErr = SC_ERR_NONE; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + sciErr = sc_ipc_getMuID(&mu_id); + if (sciErr != SC_ERR_NONE) { + pr_info("pinctrl: Cannot obtain MU ID\n"); + return -EIO; + } + + sciErr = sc_ipc_open(&priv->nvmem_ipc, mu_id); + + if (sciErr != SC_ERR_NONE) { + pr_info("pinctrl: Cannot open MU channel to SCU\n"); + return -EIO; + }; + + of_id = of_match_device(imx_scu_ocotp_dt_ids, dev); + priv->nregs = (unsigned long)of_id->data; + priv->dev = dev; + imx_scu_ocotp_nvmem_config.size = 4 * priv->nregs; + imx_scu_ocotp_nvmem_config.dev = dev; + imx_scu_ocotp_nvmem_config.priv = priv; + nvmem = nvmem_register(&imx_scu_ocotp_nvmem_config); + if (IS_ERR(nvmem)) + return PTR_ERR(nvmem); + + platform_set_drvdata(pdev, nvmem); + + return 0; +} + +static int imx_scu_ocotp_remove(struct platform_device *pdev) +{ + struct nvmem_device *nvmem = platform_get_drvdata(pdev); + + return nvmem_unregister(nvmem); +} + +static struct platform_driver imx_scu_ocotp_driver = { + .probe = imx_scu_ocotp_probe, + .remove = imx_scu_ocotp_remove, + .driver = { + .name = "imx_scu_ocotp", + .of_match_table = imx_scu_ocotp_dt_ids, + }, +}; +module_platform_driver(imx_scu_ocotp_driver); + +MODULE_AUTHOR("Peng Fan "); +MODULE_DESCRIPTION("i.MX8QM OCOTP fuse box driver"); +MODULE_LICENSE("GPL v2");