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authorPeng Fan <peng.fan@nxp.com>2019-06-14 16:32:19 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-19 19:35:51 +0200
commit67ff708bd2facd0a7b93f3c5960586999962456d (patch)
treeaa15862fe4d7ba01791809478a373ee9808b34da /drivers
parentdt-bindings: fsl: scu: add ocotp binding (diff)
downloadlinux-67ff708bd2facd0a7b93f3c5960586999962456d.tar.xz
linux-67ff708bd2facd0a7b93f3c5960586999962456d.zip
nvmem: imx: add i.MX8 nvmem driver
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> Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/nvmem/Kconfig7
-rw-r--r--drivers/nvmem/Makefile2
-rw-r--r--drivers/nvmem/imx-ocotp-scu.c161
3 files changed, 170 insertions, 0 deletions
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index afa4335e0a20..d2b0374dff80 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -47,6 +47,13 @@ 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 c1fe4768dfef..e5c153d99a67 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -16,6 +16,8 @@ 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..d9dc482ecb2f
--- /dev/null
+++ b/drivers/nvmem/imx-ocotp-scu.c
@@ -0,0 +1,161 @@
+// 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_misc_fuse_read {
+ struct imx_sc_rpc_msg hdr;
+ u32 word;
+} __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_misc_fuse_read msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ int ret;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_MISC;
+ hdr->func = 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;
+
+ *val = msg.word;
+
+ 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)) {
+ *buf++ = 0;
+ continue;
+ }
+ }
+
+ ret = imx_sc_misc_otp_fuse_read(priv->nvmem_ipc, i, buf);
+ if (ret) {
+ kfree(p);
+ return ret;
+ }
+ buf++;
+ }
+
+ memcpy(val, (u8 *)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");