// SPDX-License-Identifier: GPL-2.0-or-later /* * JZ4780 EFUSE Memory Support driver * * Copyright (c) 2017 PrasannaKumar Muralidharan <[email protected]> * Copyright (c) 2020 H. Nikolaus Schaller <[email protected]> */ /* * Currently supports JZ4780 efuse which has 8K programmable bit. * Efuse is separated into seven segments as below: * * ----------------------------------------------------------------------- * | 64 bit | 128 bit | 128 bit | 3520 bit | 8 bit | 2296 bit | 2048 bit | * ----------------------------------------------------------------------- * * The rom itself is accessed using a 9 bit address line and an 8 word wide bus * which reads/writes based on strobes. The strobe is configured in the config * register and is based on number of cycles of the bus clock. * * Driver supports read only as the writes are done in the Factory. */ #include <linux/bitops.h> #include <linux/clk.h> #include <linux/module.h> #include <linux/nvmem-provider.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/timer.h> #define JZ_EFUCTRL … #define JZ_EFUCFG … #define JZ_EFUSTATE … #define JZ_EFUDATA(n) … /* We read 32 byte chunks to avoid complexity in the driver. */ #define JZ_EFU_READ_SIZE … #define EFUCTRL_ADDR_MASK … #define EFUCTRL_ADDR_SHIFT … #define EFUCTRL_LEN_MASK … #define EFUCTRL_LEN_SHIFT … #define EFUCTRL_PG_EN … #define EFUCTRL_WR_EN … #define EFUCTRL_RD_EN … #define EFUCFG_INT_EN … #define EFUCFG_RD_ADJ_MASK … #define EFUCFG_RD_ADJ_SHIFT … #define EFUCFG_RD_STR_MASK … #define EFUCFG_RD_STR_SHIFT … #define EFUCFG_WR_ADJ_MASK … #define EFUCFG_WR_ADJ_SHIFT … #define EFUCFG_WR_STR_MASK … #define EFUCFG_WR_STR_SHIFT … #define EFUSTATE_WR_DONE … #define EFUSTATE_RD_DONE … struct jz4780_efuse { … }; /* main entry point */ static int jz4780_efuse_read(void *context, unsigned int offset, void *val, size_t bytes) { … } static struct nvmem_config jz4780_efuse_nvmem_config = …; static const struct regmap_config jz4780_efuse_regmap_config = …; static void clk_disable_unprepare_helper(void *clock) { … } static int jz4780_efuse_probe(struct platform_device *pdev) { … } static const struct of_device_id jz4780_efuse_match[] = …; MODULE_DEVICE_TABLE(of, jz4780_efuse_match); static struct platform_driver jz4780_efuse_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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