1 // SPDX-License-Identifier: GPL-2.0-only
3  * NXP LPC18xx/43xx OTP memory NVMEM driver
10  * TODO: add support for writing OTP register via API in boot ROM.
15 #include <linux/nvmem-provider.h>
21  * LPC18xx OTP memory contains 4 banks with 4 32-bit words. Bank 0 starts
26  * Bank 1/2 is generale purpose or AES key storage for secure devices.
43 	struct lpc18xx_otp *otp = context;  in lpc18xx_otp_read()  local
49 	if (count > (LPC18XX_OTP_SIZE - index))  in lpc18xx_otp_read()
50 		count = LPC18XX_OTP_SIZE - index;  in lpc18xx_otp_read()
53 		*buf++ = readl(otp->base + i * LPC18XX_OTP_WORD_SIZE);  in lpc18xx_otp_read()
59 	.name = "lpc18xx-otp",
69 	struct lpc18xx_otp *otp;  in lpc18xx_otp_probe()  local
71 	otp = devm_kzalloc(&pdev->dev, sizeof(*otp), GFP_KERNEL);  in lpc18xx_otp_probe()
72 	if (!otp)  in lpc18xx_otp_probe()
73 		return -ENOMEM;  in lpc18xx_otp_probe()
75 	otp->base = devm_platform_ioremap_resource(pdev, 0);  in lpc18xx_otp_probe()
76 	if (IS_ERR(otp->base))  in lpc18xx_otp_probe()
77 		return PTR_ERR(otp->base);  in lpc18xx_otp_probe()
80 	lpc18xx_otp_nvmem_config.dev = &pdev->dev;  in lpc18xx_otp_probe()
81 	lpc18xx_otp_nvmem_config.priv = otp;  in lpc18xx_otp_probe()
83 	nvmem = devm_nvmem_register(&pdev->dev, &lpc18xx_otp_nvmem_config);  in lpc18xx_otp_probe()
89 	{ .compatible = "nxp,lpc1850-otp" },
104 MODULE_DESCRIPTION("NXP LPC18xx OTP NVMEM driver");