| Message ID | 20190508030927.16668-2-peng.fan@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [V2,1/4] dt-bindings: fsl: scu: add ocotp binding | expand |
> From: Peng Fan > Sent: Wednesday, May 8, 2019 10:56 AM > > This patch adds i.MX8 nvmem ocotp driver to access fuse via RPC to i.MX8 > system controller. > > Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > Cc: Shawn Guo <shawnguo@kernel.org> > Cc: Sascha Hauer <s.hauer@pengutronix.de> > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > Cc: Fabio Estevam <festevam@gmail.com> > Cc: NXP Linux Team <linux-imx@nxp.com> > Cc: linux-arm-kernel@lists.infradead.org > Signed-off-by: Peng Fan <peng.fan@nxp.com> > --- > > V2: > Add "scu" or "SCU", Add imx_sc_misc_otp_fuse_read, minor fixes > > drivers/nvmem/Kconfig | 7 ++ > drivers/nvmem/Makefile | 2 + > drivers/nvmem/imx-ocotp-scu.c | 170 > ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 179 insertions(+) > create mode 100644 drivers/nvmem/imx-ocotp-scu.c > > diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index > 530d570724c9..79afe44195a1 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 SCU On-Chip OTP Controller support" > + depends on IMX_SCU > + help > + This is a driver for the SCU 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..038e744c8588 > --- /dev/null > +++ b/drivers/nvmem/imx-ocotp-scu.c > @@ -0,0 +1,170 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * i.MX8 OCOTP fusebox driver > + * > + * Copyright 2019 NXP > + * > + * Peng Fan <peng.fan@nxp.com> > + */ > + > +#include <linux/firmware/imx/sci.h> > +#include <linux/module.h> > +#include <linux/nvmem-provider.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/slab.h> > + > +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; > +}; > + > +struct imx_sc_msg_req_misc_fuse_read { > + struct imx_sc_rpc_msg hdr; > + u32 word; > +} __packed; > + > +struct imx_sc_msg_resp_misc_fuse_read { > + struct imx_sc_rpc_msg hdr; > + u32 val; > +} __packed; > + How about struct imx_sc_msg_misc_fuse_read { struct imx_sc_rpc_msg hdr; union { u32 word; u32 val; } data; } __packed; Then we can save one struct and convert. > +static struct ocotp_devtype_data imx8qxp_data = { > + .devtype = IMX8QXP, > + .nregs = 800, > +}; > + > +static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word, > + u32 *val) > +{ > + struct imx_sc_msg_req_misc_fuse_read msg; > + struct imx_sc_msg_resp_misc_fuse_read *resp; > + struct imx_sc_rpc_msg *hdr = &msg.hdr; > + int ret; > + > + hdr->ver = IMX_SC_RPC_VERSION; > + hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC; > + hdr->func = (uint8_t)IMX_SC_MISC_FUNC_OTP_FUSE_READ; Pls drop the unnecessary type conversion. > + hdr->size = 2; > + > + msg.word = word; > + > + ret = imx_scu_call_rpc(ipc, &msg, true); > + if (ret) > + return ret; > + > + resp = (struct imx_sc_msg_resp_misc_fuse_read *)&msg; > + if (val != NULL) Drop this unnecessary check > + *val = resp->val; > + > + return 0; > +} > + > +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; > + u32 *buf; > + void *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; Still need convert? > + buf += 4; I'm not sure this is right Shouldn't it be buf++ ? > + continue; > + } > + } > + > + ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf); > + if (ret) { > + kfree(p); > + return ret; > + } > + buf++; > + } > + > + memcpy(val, p + offset % 4, bytes); Is there a build warning? I wonder a more safe way maybe: memcpy(val, (u8 *)p + offset % 4, byptes); Regards Dong Aisheng > + > + kfree(p); > + > + return 0; > +} > + > +static struct nvmem_config imx_scu_ocotp_nvmem_config = { > + .name = "imx-scu-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-scu-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 <peng.fan@nxp.com>"); > +MODULE_DESCRIPTION("i.MX8 SCU OCOTP fuse box driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.16.4
Hi Aisheng, > Subject: RE: [PATCH V2 2/4] nvmem: imx: add i.MX8 nvmem driver > > > From: Peng Fan > > Sent: Wednesday, May 8, 2019 10:56 AM > > > > This patch adds i.MX8 nvmem ocotp driver to access fuse via RPC to > > i.MX8 system controller. > > > > Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > > Cc: Shawn Guo <shawnguo@kernel.org> > > Cc: Sascha Hauer <s.hauer@pengutronix.de> > > Cc: Pengutronix Kernel Team <kernel@pengutronix.de> > > Cc: Fabio Estevam <festevam@gmail.com> > > Cc: NXP Linux Team <linux-imx@nxp.com> > > Cc: linux-arm-kernel@lists.infradead.org > > Signed-off-by: Peng Fan <peng.fan@nxp.com> > > --- > > > > V2: > > Add "scu" or "SCU", Add imx_sc_misc_otp_fuse_read, minor fixes > > > > drivers/nvmem/Kconfig | 7 ++ > > drivers/nvmem/Makefile | 2 + > > drivers/nvmem/imx-ocotp-scu.c | 170 > > ++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 179 insertions(+) > > create mode 100644 drivers/nvmem/imx-ocotp-scu.c > > > > diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index > > 530d570724c9..79afe44195a1 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 SCU On-Chip OTP Controller support" > > + depends on IMX_SCU > > + help > > + This is a driver for the SCU 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..038e744c8588 > > --- /dev/null > > +++ b/drivers/nvmem/imx-ocotp-scu.c > > @@ -0,0 +1,170 @@ > > +// SPDX-License-Identifier: GPL-2.0+ > > +/* > > + * i.MX8 OCOTP fusebox driver > > + * > > + * Copyright 2019 NXP > > + * > > + * Peng Fan <peng.fan@nxp.com> > > + */ > > + > > +#include <linux/firmware/imx/sci.h> > > +#include <linux/module.h> > > +#include <linux/nvmem-provider.h> > > +#include <linux/of_device.h> > > +#include <linux/platform_device.h> > > +#include <linux/slab.h> > > + > > +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; > > +}; > > + > > +struct imx_sc_msg_req_misc_fuse_read { > > + struct imx_sc_rpc_msg hdr; > > + u32 word; > > +} __packed; > > + > > +struct imx_sc_msg_resp_misc_fuse_read { > > + struct imx_sc_rpc_msg hdr; > > + u32 val; > > +} __packed; > > + > > How about > struct imx_sc_msg_misc_fuse_read { > struct imx_sc_rpc_msg hdr; > union { > u32 word; > u32 val; > } data; > } __packed; Then no need union, just "word" is ok here. Fix in V3. > > Then we can save one struct and convert. > > > +static struct ocotp_devtype_data imx8qxp_data = { > > + .devtype = IMX8QXP, > > + .nregs = 800, > > +}; > > + > > +static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word, > > + u32 *val) > > +{ > > + struct imx_sc_msg_req_misc_fuse_read msg; > > + struct imx_sc_msg_resp_misc_fuse_read *resp; > > + struct imx_sc_rpc_msg *hdr = &msg.hdr; > > + int ret; > > + > > + hdr->ver = IMX_SC_RPC_VERSION; > > + hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC; > > + hdr->func = (uint8_t)IMX_SC_MISC_FUNC_OTP_FUSE_READ; > > Pls drop the unnecessary type conversion. Ok. > > > + hdr->size = 2; > > + > > + msg.word = word; > > + > > + ret = imx_scu_call_rpc(ipc, &msg, true); > > + if (ret) > > + return ret; > > + > > + resp = (struct imx_sc_msg_resp_misc_fuse_read *)&msg; > > + if (val != NULL) > > Drop this unnecessary check ok. > > > + *val = resp->val; > > + > > + return 0; > > +} > > + > > +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; > > + u32 *buf; > > + void *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; > > Still need convert? Will drop the convert. > > > + buf += 4; > > I'm not sure this is right > Shouldn't it be buf++ ? You are right. Forget the fix the hole part. > > > + continue; > > + } > > + } > > + > > + ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf); > > + if (ret) { > > + kfree(p); > > + return ret; > > + } > > + buf++; > > + } > > + > > + memcpy(val, p + offset % 4, bytes); > > Is there a build warning? > I wonder a more safe way maybe: > memcpy(val, (u8 *)p + offset % 4, byptes); I did not meet issue. Fix in v3. Thanks, Peng. > > Regards > Dong Aisheng > > > + > > + kfree(p); > > + > > + return 0; > > +} > > + > > +static struct nvmem_config imx_scu_ocotp_nvmem_config = { > > + .name = "imx-scu-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-scu-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 <peng.fan@nxp.com>"); > > +MODULE_DESCRIPTION("i.MX8 SCU OCOTP fuse box driver"); > > +MODULE_LICENSE("GPL v2"); > > -- > > 2.16.4
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index 530d570724c9..79afe44195a1 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 SCU On-Chip OTP Controller support" + depends on IMX_SCU + help + This is a driver for the SCU 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..038e744c8588 --- /dev/null +++ b/drivers/nvmem/imx-ocotp-scu.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * i.MX8 OCOTP fusebox driver + * + * Copyright 2019 NXP + * + * Peng Fan <peng.fan@nxp.com> + */ + +#include <linux/firmware/imx/sci.h> +#include <linux/module.h> +#include <linux/nvmem-provider.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +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; +}; + +struct imx_sc_msg_req_misc_fuse_read { + struct imx_sc_rpc_msg hdr; + u32 word; +} __packed; + +struct imx_sc_msg_resp_misc_fuse_read { + struct imx_sc_rpc_msg hdr; + u32 val; +} __packed; + +static struct ocotp_devtype_data imx8qxp_data = { + .devtype = IMX8QXP, + .nregs = 800, +}; + +static int imx_sc_misc_otp_fuse_read(struct imx_sc_ipc *ipc, u32 word, + u32 *val) +{ + struct imx_sc_msg_req_misc_fuse_read msg; + struct imx_sc_msg_resp_misc_fuse_read *resp; + struct imx_sc_rpc_msg *hdr = &msg.hdr; + int ret; + + hdr->ver = IMX_SC_RPC_VERSION; + hdr->svc = (uint8_t)IMX_SC_RPC_SVC_MISC; + hdr->func = (uint8_t)IMX_SC_MISC_FUNC_OTP_FUSE_READ; + hdr->size = 2; + + msg.word = word; + + ret = imx_scu_call_rpc(ipc, &msg, true); + if (ret) + return ret; + + resp = (struct imx_sc_msg_resp_misc_fuse_read *)&msg; + if (val != NULL) + *val = resp->val; + + return 0; +} + +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; + u32 *buf; + void *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, buf); + if (ret) { + kfree(p); + return ret; + } + buf++; + } + + memcpy(val, p + offset % 4, bytes); + + kfree(p); + + return 0; +} + +static struct nvmem_config imx_scu_ocotp_nvmem_config = { + .name = "imx-scu-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-scu-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 <peng.fan@nxp.com>"); +MODULE_DESCRIPTION("i.MX8 SCU OCOTP fuse box driver"); +MODULE_LICENSE("GPL v2");
This patch adds i.MX8 nvmem ocotp driver to access fuse via RPC to i.MX8 system controller. Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: Fabio Estevam <festevam@gmail.com> Cc: NXP Linux Team <linux-imx@nxp.com> Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Peng Fan <peng.fan@nxp.com> --- V2: Add "scu" or "SCU", Add imx_sc_misc_otp_fuse_read, minor fixes drivers/nvmem/Kconfig | 7 ++ drivers/nvmem/Makefile | 2 + drivers/nvmem/imx-ocotp-scu.c | 170 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 179 insertions(+) create mode 100644 drivers/nvmem/imx-ocotp-scu.c