// SPDX-License-Identifier: GPL-2.0-or-later /* * Error Location Module * * Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/ */ #define DRIVER_NAME … #include <linux/platform_device.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/of.h> #include <linux/sched.h> #include <linux/pm_runtime.h> #include <linux/platform_data/elm.h> #define ELM_SYSCONFIG … #define ELM_IRQSTATUS … #define ELM_IRQENABLE … #define ELM_LOCATION_CONFIG … #define ELM_PAGE_CTRL … #define ELM_SYNDROME_FRAGMENT_0 … #define ELM_SYNDROME_FRAGMENT_1 … #define ELM_SYNDROME_FRAGMENT_2 … #define ELM_SYNDROME_FRAGMENT_3 … #define ELM_SYNDROME_FRAGMENT_4 … #define ELM_SYNDROME_FRAGMENT_5 … #define ELM_SYNDROME_FRAGMENT_6 … #define ELM_LOCATION_STATUS … #define ELM_ERROR_LOCATION_0 … /* ELM Interrupt Status Register */ #define INTR_STATUS_PAGE_VALID … /* ELM Interrupt Enable Register */ #define INTR_EN_PAGE_MASK … /* ELM Location Configuration Register */ #define ECC_BCH_LEVEL_MASK … /* ELM syndrome */ #define ELM_SYNDROME_VALID … /* ELM_LOCATION_STATUS Register */ #define ECC_CORRECTABLE_MASK … #define ECC_NB_ERRORS_MASK … /* ELM_ERROR_LOCATION_0-15 Registers */ #define ECC_ERROR_LOCATION_MASK … #define ELM_ECC_SIZE … #define SYNDROME_FRAGMENT_REG_SIZE … #define ERROR_LOCATION_SIZE … struct elm_registers { … }; struct elm_info { … }; static LIST_HEAD(elm_devices); static void elm_write_reg(struct elm_info *info, int offset, u32 val) { … } static u32 elm_read_reg(struct elm_info *info, int offset) { … } /** * elm_config - Configure ELM module * @dev: ELM device * @bch_type: Type of BCH ecc * @ecc_steps: ECC steps to assign to config * @ecc_step_size: ECC step size to assign to config * @ecc_syndrome_size: ECC syndrome size to assign to config */ int elm_config(struct device *dev, enum bch_ecc bch_type, int ecc_steps, int ecc_step_size, int ecc_syndrome_size) { … } EXPORT_SYMBOL(…); /** * elm_configure_page_mode - Enable/Disable page mode * @info: elm info * @index: index number of syndrome fragment vector * @enable: enable/disable flag for page mode * * Enable page mode for syndrome fragment index */ static void elm_configure_page_mode(struct elm_info *info, int index, bool enable) { … } /** * elm_load_syndrome - Load ELM syndrome reg * @info: elm info * @err_vec: elm error vectors * @ecc: buffer with calculated ecc * * Load syndrome fragment registers with calculated ecc in reverse order. */ static void elm_load_syndrome(struct elm_info *info, struct elm_errorvec *err_vec, u8 *ecc) { … } /** * elm_start_processing - start elm syndrome processing * @info: elm info * @err_vec: elm error vectors * * Set syndrome valid bit for syndrome fragment registers for which * elm syndrome fragment registers are loaded. This enables elm module * to start processing syndrome vectors. */ static void elm_start_processing(struct elm_info *info, struct elm_errorvec *err_vec) { … } /** * elm_error_correction - locate correctable error position * @info: elm info * @err_vec: elm error vectors * * On completion of processing by elm module, error location status * register updated with correctable/uncorrectable error information. * In case of correctable errors, number of errors located from * elm location status register & read the positions from * elm error location register. */ static void elm_error_correction(struct elm_info *info, struct elm_errorvec *err_vec) { … } /** * elm_decode_bch_error_page - Locate error position * @dev: device pointer * @ecc_calc: calculated ECC bytes from GPMC * @err_vec: elm error vectors * * Called with one or more error reported vectors & vectors with * error reported is updated in err_vec[].error_reported */ void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc, struct elm_errorvec *err_vec) { … } EXPORT_SYMBOL(…); static irqreturn_t elm_isr(int this_irq, void *dev_id) { … } static int elm_probe(struct platform_device *pdev) { … } static void elm_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP /* * elm_context_save * saves ELM configurations to preserve them across Hardware powered-down */ static int elm_context_save(struct elm_info *info) { … } /* * elm_context_restore * writes configurations saved duing power-down back into ELM registers */ static int elm_context_restore(struct elm_info *info) { … } static int elm_suspend(struct device *dev) { … } static int elm_resume(struct device *dev) { … } #endif static SIMPLE_DEV_PM_OPS(elm_pm_ops, elm_suspend, elm_resume); #ifdef CONFIG_OF static const struct of_device_id elm_of_match[] = …; MODULE_DEVICE_TABLE(of, elm_of_match); #endif static struct platform_driver elm_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_ALIAS(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux