diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/807-v6.1-0008-nvmem-lan9662-otp-add-support.patch')
| -rw-r--r-- | target/linux/generic/backport-5.15/807-v6.1-0008-nvmem-lan9662-otp-add-support.patch | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/807-v6.1-0008-nvmem-lan9662-otp-add-support.patch b/target/linux/generic/backport-5.15/807-v6.1-0008-nvmem-lan9662-otp-add-support.patch new file mode 100644 index 0000000000..945c6128ff --- /dev/null +++ b/target/linux/generic/backport-5.15/807-v6.1-0008-nvmem-lan9662-otp-add-support.patch @@ -0,0 +1,274 @@ +From 9e8f208ad5229ddda97cd4a83ecf89c735d99592 Mon Sep 17 00:00:00 2001 +From: Horatiu Vultur <horatiu.vultur@microchip.com> +Date: Fri, 16 Sep 2022 13:20:59 +0100 +Subject: [PATCH] nvmem: lan9662-otp: add support + +Add support for OTP controller available on LAN9662. The OTPC controls +the access to a non-volatile memory. The size of the memory is 8KB. +The OTPC can access the memory based on an offset. +Implement both the read and the write functionality. + +Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> +Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> +Link: https://lore.kernel.org/r/20220916122100.170016-13-srinivas.kandagatla@linaro.org +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/nvmem/Kconfig | 8 ++ + drivers/nvmem/Makefile | 2 + + drivers/nvmem/lan9662-otpc.c | 222 +++++++++++++++++++++++++++++++++++ + 3 files changed, 232 insertions(+) + create mode 100644 drivers/nvmem/lan9662-otpc.c + +--- a/drivers/nvmem/Kconfig ++++ b/drivers/nvmem/Kconfig +@@ -98,6 +98,14 @@ config NVMEM_JZ4780_EFUSE + To compile this driver as a module, choose M here: the module + will be called nvmem_jz4780_efuse. + ++config NVMEM_LAN9662_OTPC ++ tristate "Microchip LAN9662 OTP controller support" ++ depends on SOC_LAN966 || COMPILE_TEST ++ depends on HAS_IOMEM ++ help ++ This driver enables the OTP controller available on Microchip LAN9662 ++ SoCs. It controls the access to the OTP memory connected to it. ++ + config NVMEM_LAYERSCAPE_SFP + tristate "Layerscape SFP (Security Fuse Processor) support" + depends on ARCH_LAYERSCAPE || COMPILE_TEST +--- a/drivers/nvmem/Makefile ++++ b/drivers/nvmem/Makefile +@@ -21,6 +21,8 @@ obj-$(CONFIG_NVMEM_IMX_OCOTP_SCU) += nvm + nvmem-imx-ocotp-scu-y := imx-ocotp-scu.o + obj-$(CONFIG_NVMEM_JZ4780_EFUSE) += nvmem_jz4780_efuse.o + nvmem_jz4780_efuse-y := jz4780-efuse.o ++obj-$(CONFIG_NVMEM_LAN9662_OTPC) += nvmem-lan9662-otpc.o ++nvmem-lan9662-otpc-y := lan9662-otpc.o + obj-$(CONFIG_NVMEM_LAYERSCAPE_SFP) += nvmem-layerscape-sfp.o + nvmem-layerscape-sfp-y := layerscape-sfp.o + obj-$(CONFIG_NVMEM_LPC18XX_EEPROM) += nvmem_lpc18xx_eeprom.o +--- /dev/null ++++ b/drivers/nvmem/lan9662-otpc.c +@@ -0,0 +1,222 @@ ++// SPDX-License-Identifier: GPL-2.0 ++ ++#include <linux/iopoll.h> ++#include <linux/module.h> ++#include <linux/nvmem-provider.h> ++#include <linux/of.h> ++#include <linux/platform_device.h> ++ ++#define OTP_OTP_PWR_DN(t) (t + 0x00) ++#define OTP_OTP_PWR_DN_OTP_PWRDN_N BIT(0) ++#define OTP_OTP_ADDR_HI(t) (t + 0x04) ++#define OTP_OTP_ADDR_LO(t) (t + 0x08) ++#define OTP_OTP_PRGM_DATA(t) (t + 0x10) ++#define OTP_OTP_PRGM_MODE(t) (t + 0x14) ++#define OTP_OTP_PRGM_MODE_OTP_PGM_MODE_BYTE BIT(0) ++#define OTP_OTP_RD_DATA(t) (t + 0x18) ++#define OTP_OTP_FUNC_CMD(t) (t + 0x20) ++#define OTP_OTP_FUNC_CMD_OTP_PROGRAM BIT(1) ++#define OTP_OTP_FUNC_CMD_OTP_READ BIT(0) ++#define OTP_OTP_CMD_GO(t) (t + 0x28) ++#define OTP_OTP_CMD_GO_OTP_GO BIT(0) ++#define OTP_OTP_PASS_FAIL(t) (t + 0x2c) ++#define OTP_OTP_PASS_FAIL_OTP_READ_PROHIBITED BIT(3) ++#define OTP_OTP_PASS_FAIL_OTP_WRITE_PROHIBITED BIT(2) ++#define OTP_OTP_PASS_FAIL_OTP_FAIL BIT(0) ++#define OTP_OTP_STATUS(t) (t + 0x30) ++#define OTP_OTP_STATUS_OTP_CPUMPEN BIT(1) ++#define OTP_OTP_STATUS_OTP_BUSY BIT(0) ++ ++#define OTP_MEM_SIZE 8192 ++#define OTP_SLEEP_US 10 ++#define OTP_TIMEOUT_US 500000 ++ ++struct lan9662_otp { ++ struct device *dev; ++ void __iomem *base; ++}; ++ ++static bool lan9662_otp_wait_flag_clear(void __iomem *reg, u32 flag) ++{ ++ u32 val; ++ ++ return readl_poll_timeout(reg, val, !(val & flag), ++ OTP_SLEEP_US, OTP_TIMEOUT_US); ++} ++ ++static int lan9662_otp_power(struct lan9662_otp *otp, bool up) ++{ ++ void __iomem *pwrdn = OTP_OTP_PWR_DN(otp->base); ++ ++ if (up) { ++ writel(readl(pwrdn) & ~OTP_OTP_PWR_DN_OTP_PWRDN_N, pwrdn); ++ if (lan9662_otp_wait_flag_clear(OTP_OTP_STATUS(otp->base), ++ OTP_OTP_STATUS_OTP_CPUMPEN)) ++ return -ETIMEDOUT; ++ } else { ++ writel(readl(pwrdn) | OTP_OTP_PWR_DN_OTP_PWRDN_N, pwrdn); ++ } ++ ++ return 0; ++} ++ ++static int lan9662_otp_execute(struct lan9662_otp *otp) ++{ ++ if (lan9662_otp_wait_flag_clear(OTP_OTP_CMD_GO(otp->base), ++ OTP_OTP_CMD_GO_OTP_GO)) ++ return -ETIMEDOUT; ++ ++ if (lan9662_otp_wait_flag_clear(OTP_OTP_STATUS(otp->base), ++ OTP_OTP_STATUS_OTP_BUSY)) ++ return -ETIMEDOUT; ++ ++ return 0; ++} ++ ++static void lan9662_otp_set_address(struct lan9662_otp *otp, u32 offset) ++{ ++ writel(0xff & (offset >> 8), OTP_OTP_ADDR_HI(otp->base)); ++ writel(0xff & offset, OTP_OTP_ADDR_LO(otp->base)); ++} ++ ++static int lan9662_otp_read_byte(struct lan9662_otp *otp, u32 offset, u8 *dst) ++{ ++ u32 pass; ++ int rc; ++ ++ lan9662_otp_set_address(otp, offset); ++ writel(OTP_OTP_FUNC_CMD_OTP_READ, OTP_OTP_FUNC_CMD(otp->base)); ++ writel(OTP_OTP_CMD_GO_OTP_GO, OTP_OTP_CMD_GO(otp->base)); ++ rc = lan9662_otp_execute(otp); ++ if (!rc) { ++ pass = readl(OTP_OTP_PASS_FAIL(otp->base)); ++ if (pass & OTP_OTP_PASS_FAIL_OTP_READ_PROHIBITED) ++ return -EACCES; ++ *dst = (u8) readl(OTP_OTP_RD_DATA(otp->base)); ++ } ++ return rc; ++} ++ ++static int lan9662_otp_write_byte(struct lan9662_otp *otp, u32 offset, u8 data) ++{ ++ u32 pass; ++ int rc; ++ ++ lan9662_otp_set_address(otp, offset); ++ writel(OTP_OTP_PRGM_MODE_OTP_PGM_MODE_BYTE, OTP_OTP_PRGM_MODE(otp->base)); ++ writel(data, OTP_OTP_PRGM_DATA(otp->base)); ++ writel(OTP_OTP_FUNC_CMD_OTP_PROGRAM, OTP_OTP_FUNC_CMD(otp->base)); ++ writel(OTP_OTP_CMD_GO_OTP_GO, OTP_OTP_CMD_GO(otp->base)); ++ ++ rc = lan9662_otp_execute(otp); ++ if (!rc) { ++ pass = readl(OTP_OTP_PASS_FAIL(otp->base)); ++ if (pass & OTP_OTP_PASS_FAIL_OTP_WRITE_PROHIBITED) ++ return -EACCES; ++ if (pass & OTP_OTP_PASS_FAIL_OTP_FAIL) ++ return -EIO; ++ } ++ return rc; ++} ++ ++static int lan9662_otp_read(void *context, unsigned int offset, ++ void *_val, size_t bytes) ++{ ++ struct lan9662_otp *otp = context; ++ u8 *val = _val; ++ uint8_t data; ++ int i, rc = 0; ++ ++ lan9662_otp_power(otp, true); ++ for (i = 0; i < bytes; i++) { ++ rc = lan9662_otp_read_byte(otp, offset + i, &data); ++ if (rc < 0) ++ break; ++ *val++ = data; ++ } ++ lan9662_otp_power(otp, false); ++ ++ return rc; ++} ++ ++static int lan9662_otp_write(void *context, unsigned int offset, ++ void *_val, size_t bytes) ++{ ++ struct lan9662_otp *otp = context; ++ u8 *val = _val; ++ u8 data, newdata; ++ int i, rc = 0; ++ ++ lan9662_otp_power(otp, true); ++ for (i = 0; i < bytes; i++) { ++ /* Skip zero bytes */ ++ if (val[i]) { ++ rc = lan9662_otp_read_byte(otp, offset + i, &data); ++ if (rc < 0) ++ break; ++ ++ newdata = data | val[i]; ++ if (newdata == data) ++ continue; ++ ++ rc = lan9662_otp_write_byte(otp, offset + i, ++ newdata); ++ if (rc < 0) ++ break; ++ } ++ } ++ lan9662_otp_power(otp, false); ++ ++ return rc; ++} ++ ++static struct nvmem_config otp_config = { ++ .name = "lan9662-otp", ++ .stride = 1, ++ .word_size = 1, ++ .reg_read = lan9662_otp_read, ++ .reg_write = lan9662_otp_write, ++ .size = OTP_MEM_SIZE, ++}; ++ ++static int lan9662_otp_probe(struct platform_device *pdev) ++{ ++ struct device *dev = &pdev->dev; ++ struct nvmem_device *nvmem; ++ struct lan9662_otp *otp; ++ ++ otp = devm_kzalloc(&pdev->dev, sizeof(*otp), GFP_KERNEL); ++ if (!otp) ++ return -ENOMEM; ++ ++ otp->dev = dev; ++ otp->base = devm_platform_ioremap_resource(pdev, 0); ++ if (IS_ERR(otp->base)) ++ return PTR_ERR(otp->base); ++ ++ otp_config.priv = otp; ++ otp_config.dev = dev; ++ ++ nvmem = devm_nvmem_register(dev, &otp_config); ++ ++ return PTR_ERR_OR_ZERO(nvmem); ++} ++ ++static const struct of_device_id lan9662_otp_match[] = { ++ { .compatible = "microchip,lan9662-otp", }, ++ { }, ++}; ++MODULE_DEVICE_TABLE(of, lan9662_otp_match); ++ ++static struct platform_driver lan9662_otp_driver = { ++ .probe = lan9662_otp_probe, ++ .driver = { ++ .name = "lan9662-otp", ++ .of_match_table = lan9662_otp_match, ++ }, ++}; ++module_platform_driver(lan9662_otp_driver); ++ ++MODULE_AUTHOR("Horatiu Vultur <horatiu.vultur@microchip.com>"); ++MODULE_DESCRIPTION("lan9662 OTP driver"); ++MODULE_LICENSE("GPL"); |