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Sun, 5 May 2019 13:28:17 +0000 From: Peng Fan To: "robh+dt@kernel.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "festevam@gmail.com" , "srinivas.kandagatla@linaro.org" Subject: [PATCH 2/4] nvmem: imx: add i.MX8 nvmem driver Thread-Topic: [PATCH 2/4] nvmem: imx: add i.MX8 nvmem driver Thread-Index: AQHVA0ZmyuV26b+HdU+wzmbIrs3FtA== Date: Sun, 5 May 2019 13:28:17 +0000 Message-ID: <20190505134130.28071-2-peng.fan@nxp.com> References: <20190505134130.28071-1-peng.fan@nxp.com> In-Reply-To: <20190505134130.28071-1-peng.fan@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.16.4 x-clientproxiedby: HK0PR03CA0099.apcprd03.prod.outlook.com (2603:1096:203:b0::15) To AM0PR04MB4481.eurprd04.prod.outlook.com (2603:10a6:208:70::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=peng.fan@nxp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [119.31.174.71] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8d64af35-bd01-42d5-5388-08d6d15d8862 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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H:AM0PR04MB4481.eurprd04.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: vdXR6lOafMzZV0TvwuVHXOmEpInsRgX6wPGqgAnTOa21jAkVdZ9OcwLF9kERf+Sis7wVmzfIwlXikY+ZdV7fQUA6Lm1Goqj0eUcHfrReDSOK3yLb7AvJIT0zd5Ip7xFywMewm0ofGSPgZ1rZjP/3LZIf+v1d2I0qLMhAGqqh2efIuLochqFghpRdaocyT4xoS4n2WstT3PIJQXBHxDkSWeZ5560ZS/ndKw5uAsyjrj71sGsjZ7FX8hZiSfuqW7jMgxFsd6Tyr50Go9+osBudbI18Cqt8PN2nmlLUz5c+xhtRZyBbJC1gRU5b1cFhnhRf6Q+SyLZSEQdR5a6gD7uhCxftrvZFAEd2KeJkQU3U7OHhvrVLhK7k3kpss6C7g8DuZxszWUZy3rYuy76UDZr8bYDRmoLIYSfu+yQm6bicn50= MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8d64af35-bd01-42d5-5388-08d6d15d8862 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 May 2019 13:28:17.6748 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB4259 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190505_062823_287377_46F23940 X-CRM114-Status: GOOD ( 19.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "devicetree@vger.kernel.org" , Peng Fan , "linux-kernel@vger.kernel.org" , dl-linux-imx , "kernel@pengutronix.de" , "van.freenix@gmail.com" , "linux-arm-kernel@lists.infradead.org" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds i.MX8 nvmem ocotp driver to access fuse via RPC to i.MX8 system controller. Signed-off-by: Peng Fan Cc: Srinivas Kandagatla Cc: Shawn Guo Cc: Sascha Hauer Cc: Pengutronix Kernel Team Cc: Fabio Estevam Cc: NXP Linux Team Cc: linux-arm-kernel@lists.infradead.org --- drivers/nvmem/Kconfig | 7 +++ drivers/nvmem/Makefile | 2 + drivers/nvmem/imx-ocotp-scu.c | 135 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/nvmem/imx-ocotp-scu.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 530d570724c9..0e705c04bd8c 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -36,6 +36,13 @@ 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_OCOTP_SCU + tristate "i.MX8 On-Chip OTP Controller support" + depends on IMX_SCU + help + This is a driver for the On-Chip OTP Controller (OCOTP) + available on i.MX8 SoCs. + 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 2ece8ffffdda..30d653d34e57 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-$(CONFIG_NVMEM_IMX_OCOTP_SCU) += nvmem-imx-ocotp-scu.o +nvmem-imx-ocotp-scu-y := imx-ocotp-scu.o obj-$(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-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c new file mode 100644 index 000000000000..07e1eba385ac --- /dev/null +++ b/drivers/nvmem/imx-ocotp-scu.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * i.MX8 OCOTP fusebox driver + * + * Copyright 2019 NXP + * + * Peng Fan + */ + +#include +#include +#include +#include +#include +#include + +enum ocotp_devtype { + IMX8QXP, +}; + +struct ocotp_devtype_data { + int devtype; + int nregs; +}; + +struct ocotp_priv { + struct device *dev; + const struct ocotp_devtype_data *data; + struct imx_sc_ipc *nvmem_ipc; +}; + +static struct ocotp_devtype_data imx8qxp_data = { + .devtype = IMX8QXP, + .nregs = 800, +}; + +static int imx_scu_ocotp_read(void *context, unsigned int offset, + void *val, size_t bytes) +{ + struct ocotp_priv *priv = context; + u32 count, index, num_bytes; + u8 *buf, *p; + int i, ret; + + index = offset >> 2; + num_bytes = round_up((offset % 4) + bytes, 4); + count = num_bytes >> 2; + + if (count > (priv->data->nregs - index)) + count = priv->data->nregs - index; + + p = kzalloc(num_bytes, GFP_KERNEL); + if (!p) + return -ENOMEM; + + buf = p; + + for (i = index; i < (index + count); i++) { + if (priv->data->devtype == IMX8QXP) { + if ((i > 271) && (i < 544)) { + *(u32 *)buf = 0; + buf += 4; + continue; + } + } + + ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, + (u32 *)buf); + if (ret) { + kfree(p); + return ret; + } + 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,imx8qxp-ocotp", (void *)&imx8qxp_data }, + { }, +}; +MODULE_DEVICE_TABLE(of, imx_scu_ocotp_dt_ids); + +static int imx_scu_ocotp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ocotp_priv *priv; + struct nvmem_device *nvmem; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + ret = imx_scu_get_handle(&priv->nvmem_ipc); + if (ret) + return ret; + + priv->data = of_device_get_match_data(dev); + priv->dev = dev; + imx_scu_ocotp_nvmem_config.size = 4 * priv->data->nregs; + imx_scu_ocotp_nvmem_config.dev = dev; + imx_scu_ocotp_nvmem_config.priv = priv; + nvmem = devm_nvmem_register(dev, &imx_scu_ocotp_nvmem_config); + + return PTR_ERR_OR_ZERO(nvmem); +} + +static struct platform_driver imx_scu_ocotp_driver = { + .probe = imx_scu_ocotp_probe, + .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");