574 lines
15 KiB
C
574 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Error Location Module
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - https://www.ti.com/
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*/
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#define DRIVER_NAME "omap-elm"
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/sched.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_data/elm.h>
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#define ELM_SYSCONFIG 0x010
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#define ELM_IRQSTATUS 0x018
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#define ELM_IRQENABLE 0x01c
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#define ELM_LOCATION_CONFIG 0x020
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#define ELM_PAGE_CTRL 0x080
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#define ELM_SYNDROME_FRAGMENT_0 0x400
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#define ELM_SYNDROME_FRAGMENT_1 0x404
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#define ELM_SYNDROME_FRAGMENT_2 0x408
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#define ELM_SYNDROME_FRAGMENT_3 0x40c
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#define ELM_SYNDROME_FRAGMENT_4 0x410
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#define ELM_SYNDROME_FRAGMENT_5 0x414
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#define ELM_SYNDROME_FRAGMENT_6 0x418
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#define ELM_LOCATION_STATUS 0x800
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#define ELM_ERROR_LOCATION_0 0x880
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/* ELM Interrupt Status Register */
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#define INTR_STATUS_PAGE_VALID BIT(8)
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/* ELM Interrupt Enable Register */
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#define INTR_EN_PAGE_MASK BIT(8)
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/* ELM Location Configuration Register */
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#define ECC_BCH_LEVEL_MASK 0x3
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/* ELM syndrome */
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#define ELM_SYNDROME_VALID BIT(16)
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/* ELM_LOCATION_STATUS Register */
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#define ECC_CORRECTABLE_MASK BIT(8)
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#define ECC_NB_ERRORS_MASK 0x1f
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/* ELM_ERROR_LOCATION_0-15 Registers */
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#define ECC_ERROR_LOCATION_MASK 0x1fff
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#define ELM_ECC_SIZE 0x7ff
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#define SYNDROME_FRAGMENT_REG_SIZE 0x40
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#define ERROR_LOCATION_SIZE 0x100
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struct elm_registers {
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u32 elm_irqenable;
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u32 elm_sysconfig;
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u32 elm_location_config;
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u32 elm_page_ctrl;
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u32 elm_syndrome_fragment_6[ERROR_VECTOR_MAX];
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u32 elm_syndrome_fragment_5[ERROR_VECTOR_MAX];
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u32 elm_syndrome_fragment_4[ERROR_VECTOR_MAX];
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u32 elm_syndrome_fragment_3[ERROR_VECTOR_MAX];
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u32 elm_syndrome_fragment_2[ERROR_VECTOR_MAX];
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u32 elm_syndrome_fragment_1[ERROR_VECTOR_MAX];
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u32 elm_syndrome_fragment_0[ERROR_VECTOR_MAX];
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};
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struct elm_info {
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struct device *dev;
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void __iomem *elm_base;
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struct completion elm_completion;
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struct list_head list;
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enum bch_ecc bch_type;
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struct elm_registers elm_regs;
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int ecc_steps;
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int ecc_syndrome_size;
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};
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static LIST_HEAD(elm_devices);
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static void elm_write_reg(struct elm_info *info, int offset, u32 val)
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{
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writel(val, info->elm_base + offset);
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}
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static u32 elm_read_reg(struct elm_info *info, int offset)
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{
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return readl(info->elm_base + offset);
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}
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/**
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* elm_config - Configure ELM module
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* @dev: ELM device
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* @bch_type: Type of BCH ecc
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* @ecc_steps: ECC steps to assign to config
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* @ecc_step_size: ECC step size to assign to config
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* @ecc_syndrome_size: ECC syndrome size to assign to config
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*/
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int elm_config(struct device *dev, enum bch_ecc bch_type,
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int ecc_steps, int ecc_step_size, int ecc_syndrome_size)
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{
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u32 reg_val;
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struct elm_info *info = dev_get_drvdata(dev);
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if (!info) {
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dev_err(dev, "Unable to configure elm - device not probed?\n");
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return -EPROBE_DEFER;
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}
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/* ELM cannot detect ECC errors for chunks > 1KB */
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if (ecc_step_size > ((ELM_ECC_SIZE + 1) / 2)) {
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dev_err(dev, "unsupported config ecc-size=%d\n", ecc_step_size);
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return -EINVAL;
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}
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/* ELM support 8 error syndrome process */
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if (ecc_steps > ERROR_VECTOR_MAX && ecc_steps % ERROR_VECTOR_MAX) {
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dev_err(dev, "unsupported config ecc-step=%d\n", ecc_steps);
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return -EINVAL;
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}
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reg_val = (bch_type & ECC_BCH_LEVEL_MASK) | (ELM_ECC_SIZE << 16);
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elm_write_reg(info, ELM_LOCATION_CONFIG, reg_val);
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info->bch_type = bch_type;
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info->ecc_steps = ecc_steps;
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info->ecc_syndrome_size = ecc_syndrome_size;
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return 0;
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}
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EXPORT_SYMBOL(elm_config);
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/**
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* elm_configure_page_mode - Enable/Disable page mode
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* @info: elm info
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* @index: index number of syndrome fragment vector
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* @enable: enable/disable flag for page mode
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*
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* Enable page mode for syndrome fragment index
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*/
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static void elm_configure_page_mode(struct elm_info *info, int index,
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bool enable)
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{
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u32 reg_val;
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reg_val = elm_read_reg(info, ELM_PAGE_CTRL);
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if (enable)
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reg_val |= BIT(index); /* enable page mode */
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else
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reg_val &= ~BIT(index); /* disable page mode */
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elm_write_reg(info, ELM_PAGE_CTRL, reg_val);
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}
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/**
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* elm_load_syndrome - Load ELM syndrome reg
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* @info: elm info
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* @err_vec: elm error vectors
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* @ecc: buffer with calculated ecc
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*
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* Load syndrome fragment registers with calculated ecc in reverse order.
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*/
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static void elm_load_syndrome(struct elm_info *info,
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struct elm_errorvec *err_vec, u8 *ecc)
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{
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int i, offset;
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u32 val;
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for (i = 0; i < info->ecc_steps; i++) {
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/* Check error reported */
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if (err_vec[i].error_reported) {
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elm_configure_page_mode(info, i, true);
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offset = ELM_SYNDROME_FRAGMENT_0 +
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SYNDROME_FRAGMENT_REG_SIZE * i;
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switch (info->bch_type) {
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case BCH8_ECC:
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/* syndrome fragment 0 = ecc[9-12B] */
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val = cpu_to_be32(*(u32 *) &ecc[9]);
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elm_write_reg(info, offset, val);
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/* syndrome fragment 1 = ecc[5-8B] */
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[5]);
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elm_write_reg(info, offset, val);
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/* syndrome fragment 2 = ecc[1-4B] */
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[1]);
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elm_write_reg(info, offset, val);
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/* syndrome fragment 3 = ecc[0B] */
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offset += 4;
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val = ecc[0];
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elm_write_reg(info, offset, val);
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break;
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case BCH4_ECC:
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/* syndrome fragment 0 = ecc[20-52b] bits */
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val = (cpu_to_be32(*(u32 *) &ecc[3]) >> 4) |
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((ecc[2] & 0xf) << 28);
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elm_write_reg(info, offset, val);
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/* syndrome fragment 1 = ecc[0-20b] bits */
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[0]) >> 12;
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elm_write_reg(info, offset, val);
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break;
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case BCH16_ECC:
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val = cpu_to_be32(*(u32 *) &ecc[22]);
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elm_write_reg(info, offset, val);
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[18]);
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elm_write_reg(info, offset, val);
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[14]);
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elm_write_reg(info, offset, val);
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[10]);
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elm_write_reg(info, offset, val);
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[6]);
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elm_write_reg(info, offset, val);
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[2]);
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elm_write_reg(info, offset, val);
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offset += 4;
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val = cpu_to_be32(*(u32 *) &ecc[0]) >> 16;
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elm_write_reg(info, offset, val);
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break;
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default:
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pr_err("invalid config bch_type\n");
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}
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}
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/* Update ecc pointer with ecc byte size */
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ecc += info->ecc_syndrome_size;
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}
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}
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/**
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* elm_start_processing - start elm syndrome processing
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* @info: elm info
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* @err_vec: elm error vectors
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*
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* Set syndrome valid bit for syndrome fragment registers for which
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* elm syndrome fragment registers are loaded. This enables elm module
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* to start processing syndrome vectors.
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*/
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static void elm_start_processing(struct elm_info *info,
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struct elm_errorvec *err_vec)
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{
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int i, offset;
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u32 reg_val;
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/*
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* Set syndrome vector valid, so that ELM module
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* will process it for vectors error is reported
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*/
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for (i = 0; i < info->ecc_steps; i++) {
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if (err_vec[i].error_reported) {
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offset = ELM_SYNDROME_FRAGMENT_6 +
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SYNDROME_FRAGMENT_REG_SIZE * i;
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reg_val = elm_read_reg(info, offset);
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reg_val |= ELM_SYNDROME_VALID;
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elm_write_reg(info, offset, reg_val);
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}
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}
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}
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/**
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* elm_error_correction - locate correctable error position
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* @info: elm info
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* @err_vec: elm error vectors
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*
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* On completion of processing by elm module, error location status
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* register updated with correctable/uncorrectable error information.
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* In case of correctable errors, number of errors located from
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* elm location status register & read the positions from
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* elm error location register.
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*/
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static void elm_error_correction(struct elm_info *info,
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struct elm_errorvec *err_vec)
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{
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int i, j, errors = 0;
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int offset;
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u32 reg_val;
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for (i = 0; i < info->ecc_steps; i++) {
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/* Check error reported */
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if (err_vec[i].error_reported) {
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offset = ELM_LOCATION_STATUS + ERROR_LOCATION_SIZE * i;
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reg_val = elm_read_reg(info, offset);
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/* Check correctable error or not */
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if (reg_val & ECC_CORRECTABLE_MASK) {
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offset = ELM_ERROR_LOCATION_0 +
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ERROR_LOCATION_SIZE * i;
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/* Read count of correctable errors */
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err_vec[i].error_count = reg_val &
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ECC_NB_ERRORS_MASK;
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/* Update the error locations in error vector */
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for (j = 0; j < err_vec[i].error_count; j++) {
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reg_val = elm_read_reg(info, offset);
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err_vec[i].error_loc[j] = reg_val &
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ECC_ERROR_LOCATION_MASK;
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/* Update error location register */
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offset += 4;
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}
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errors += err_vec[i].error_count;
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} else {
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err_vec[i].error_uncorrectable = true;
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}
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/* Clearing interrupts for processed error vectors */
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elm_write_reg(info, ELM_IRQSTATUS, BIT(i));
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/* Disable page mode */
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elm_configure_page_mode(info, i, false);
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}
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}
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}
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/**
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* elm_decode_bch_error_page - Locate error position
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* @dev: device pointer
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* @ecc_calc: calculated ECC bytes from GPMC
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* @err_vec: elm error vectors
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*
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* Called with one or more error reported vectors & vectors with
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* error reported is updated in err_vec[].error_reported
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*/
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void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
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struct elm_errorvec *err_vec)
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{
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struct elm_info *info = dev_get_drvdata(dev);
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u32 reg_val;
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/* Enable page mode interrupt */
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reg_val = elm_read_reg(info, ELM_IRQSTATUS);
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elm_write_reg(info, ELM_IRQSTATUS, reg_val & INTR_STATUS_PAGE_VALID);
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elm_write_reg(info, ELM_IRQENABLE, INTR_EN_PAGE_MASK);
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/* Load valid ecc byte to syndrome fragment register */
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elm_load_syndrome(info, err_vec, ecc_calc);
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/* Enable syndrome processing for which syndrome fragment is updated */
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elm_start_processing(info, err_vec);
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/* Wait for ELM module to finish locating error correction */
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wait_for_completion(&info->elm_completion);
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/* Disable page mode interrupt */
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reg_val = elm_read_reg(info, ELM_IRQENABLE);
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elm_write_reg(info, ELM_IRQENABLE, reg_val & ~INTR_EN_PAGE_MASK);
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elm_error_correction(info, err_vec);
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}
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EXPORT_SYMBOL(elm_decode_bch_error_page);
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static irqreturn_t elm_isr(int this_irq, void *dev_id)
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{
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u32 reg_val;
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struct elm_info *info = dev_id;
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reg_val = elm_read_reg(info, ELM_IRQSTATUS);
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/* All error vectors processed */
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if (reg_val & INTR_STATUS_PAGE_VALID) {
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elm_write_reg(info, ELM_IRQSTATUS,
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reg_val & INTR_STATUS_PAGE_VALID);
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complete(&info->elm_completion);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int elm_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct elm_info *info;
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int irq;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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info->elm_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(info->elm_base))
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return PTR_ERR(info->elm_base);
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ret = devm_request_irq(&pdev->dev, irq, elm_isr, 0,
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pdev->name, info);
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if (ret) {
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dev_err(&pdev->dev, "failure requesting %d\n", irq);
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return ret;
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}
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pm_runtime_enable(&pdev->dev);
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if (pm_runtime_get_sync(&pdev->dev) < 0) {
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ret = -EINVAL;
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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dev_err(&pdev->dev, "can't enable clock\n");
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return ret;
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}
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init_completion(&info->elm_completion);
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INIT_LIST_HEAD(&info->list);
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list_add(&info->list, &elm_devices);
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platform_set_drvdata(pdev, info);
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return ret;
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}
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static int elm_remove(struct platform_device *pdev)
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{
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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/*
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* elm_context_save
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* saves ELM configurations to preserve them across Hardware powered-down
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*/
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static int elm_context_save(struct elm_info *info)
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{
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struct elm_registers *regs = &info->elm_regs;
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enum bch_ecc bch_type = info->bch_type;
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u32 offset = 0, i;
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regs->elm_irqenable = elm_read_reg(info, ELM_IRQENABLE);
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regs->elm_sysconfig = elm_read_reg(info, ELM_SYSCONFIG);
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regs->elm_location_config = elm_read_reg(info, ELM_LOCATION_CONFIG);
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regs->elm_page_ctrl = elm_read_reg(info, ELM_PAGE_CTRL);
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for (i = 0; i < ERROR_VECTOR_MAX; i++) {
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offset = i * SYNDROME_FRAGMENT_REG_SIZE;
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switch (bch_type) {
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case BCH16_ECC:
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regs->elm_syndrome_fragment_6[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_6 + offset);
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regs->elm_syndrome_fragment_5[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_5 + offset);
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regs->elm_syndrome_fragment_4[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_4 + offset);
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fallthrough;
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case BCH8_ECC:
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regs->elm_syndrome_fragment_3[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_3 + offset);
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regs->elm_syndrome_fragment_2[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_2 + offset);
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fallthrough;
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case BCH4_ECC:
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regs->elm_syndrome_fragment_1[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_1 + offset);
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regs->elm_syndrome_fragment_0[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_0 + offset);
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break;
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default:
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return -EINVAL;
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}
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/* ELM SYNDROME_VALID bit in SYNDROME_FRAGMENT_6[] needs
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* to be saved for all BCH schemes*/
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regs->elm_syndrome_fragment_6[i] = elm_read_reg(info,
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ELM_SYNDROME_FRAGMENT_6 + offset);
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}
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return 0;
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}
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/*
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* elm_context_restore
|
|
* writes configurations saved duing power-down back into ELM registers
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|
*/
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|
static int elm_context_restore(struct elm_info *info)
|
|
{
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|
struct elm_registers *regs = &info->elm_regs;
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|
enum bch_ecc bch_type = info->bch_type;
|
|
u32 offset = 0, i;
|
|
|
|
elm_write_reg(info, ELM_IRQENABLE, regs->elm_irqenable);
|
|
elm_write_reg(info, ELM_SYSCONFIG, regs->elm_sysconfig);
|
|
elm_write_reg(info, ELM_LOCATION_CONFIG, regs->elm_location_config);
|
|
elm_write_reg(info, ELM_PAGE_CTRL, regs->elm_page_ctrl);
|
|
for (i = 0; i < ERROR_VECTOR_MAX; i++) {
|
|
offset = i * SYNDROME_FRAGMENT_REG_SIZE;
|
|
switch (bch_type) {
|
|
case BCH16_ECC:
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_6 + offset,
|
|
regs->elm_syndrome_fragment_6[i]);
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_5 + offset,
|
|
regs->elm_syndrome_fragment_5[i]);
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_4 + offset,
|
|
regs->elm_syndrome_fragment_4[i]);
|
|
fallthrough;
|
|
case BCH8_ECC:
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_3 + offset,
|
|
regs->elm_syndrome_fragment_3[i]);
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_2 + offset,
|
|
regs->elm_syndrome_fragment_2[i]);
|
|
fallthrough;
|
|
case BCH4_ECC:
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_1 + offset,
|
|
regs->elm_syndrome_fragment_1[i]);
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_0 + offset,
|
|
regs->elm_syndrome_fragment_0[i]);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
/* ELM_SYNDROME_VALID bit to be set in last to trigger FSM */
|
|
elm_write_reg(info, ELM_SYNDROME_FRAGMENT_6 + offset,
|
|
regs->elm_syndrome_fragment_6[i] &
|
|
ELM_SYNDROME_VALID);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int elm_suspend(struct device *dev)
|
|
{
|
|
struct elm_info *info = dev_get_drvdata(dev);
|
|
elm_context_save(info);
|
|
pm_runtime_put_sync(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int elm_resume(struct device *dev)
|
|
{
|
|
struct elm_info *info = dev_get_drvdata(dev);
|
|
pm_runtime_get_sync(dev);
|
|
elm_context_restore(info);
|
|
return 0;
|
|
}
|
|
#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[] = {
|
|
{ .compatible = "ti,am3352-elm" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, elm_of_match);
|
|
#endif
|
|
|
|
static struct platform_driver elm_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = of_match_ptr(elm_of_match),
|
|
.pm = &elm_pm_ops,
|
|
},
|
|
.probe = elm_probe,
|
|
.remove = elm_remove,
|
|
};
|
|
|
|
module_platform_driver(elm_driver);
|
|
|
|
MODULE_DESCRIPTION("ELM driver for BCH error correction");
|
|
MODULE_AUTHOR("Texas Instruments");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
MODULE_LICENSE("GPL v2");
|