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Release 4.14 drivers/edac/synopsys_edac.c

Directory: drivers/edac
/*
 * Synopsys DDR ECC Driver
 * This driver is based on ppc4xx_edac.c drivers
 *
 * Copyright (C) 2012 - 2014 Xilinx, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details
 */

#include <linux/edac.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include "edac_module.h"

/* Number of cs_rows needed per memory controller */

#define SYNPS_EDAC_NR_CSROWS	1

/* Number of channels per memory controller */

#define SYNPS_EDAC_NR_CHANS	1

/* Granularity of reported error in bytes */

#define SYNPS_EDAC_ERR_GRAIN	1


#define SYNPS_EDAC_MSG_SIZE	256


#define SYNPS_EDAC_MOD_STRING	"synps_edac"

#define SYNPS_EDAC_MOD_VER	"1"

/* Synopsys DDR memory controller registers that are relevant to ECC */

#define CTRL_OFST		0x0

#define T_ZQ_OFST		0xA4

/* ECC control register */

#define ECC_CTRL_OFST		0xC4
/* ECC log register */

#define CE_LOG_OFST		0xC8
/* ECC address register */

#define CE_ADDR_OFST		0xCC
/* ECC data[31:0] register */

#define CE_DATA_31_0_OFST	0xD0

/* Uncorrectable error info registers */

#define UE_LOG_OFST		0xDC

#define UE_ADDR_OFST		0xE0

#define UE_DATA_31_0_OFST	0xE4


#define STAT_OFST		0xF0

#define SCRUB_OFST		0xF4

/* Control register bit field definitions */

#define CTRL_BW_MASK		0xC

#define CTRL_BW_SHIFT		2


#define DDRCTL_WDTH_16		1

#define DDRCTL_WDTH_32		0

/* ZQ register bit field definitions */

#define T_ZQ_DDRMODE_MASK	0x2

/* ECC control register bit field definitions */

#define ECC_CTRL_CLR_CE_ERR	0x2

#define ECC_CTRL_CLR_UE_ERR	0x1

/* ECC correctable/uncorrectable error log register definitions */

#define LOG_VALID		0x1

#define CE_LOG_BITPOS_MASK	0xFE

#define CE_LOG_BITPOS_SHIFT	1

/* ECC correctable/uncorrectable error address register definitions */

#define ADDR_COL_MASK		0xFFF

#define ADDR_ROW_MASK		0xFFFF000

#define ADDR_ROW_SHIFT		12

#define ADDR_BANK_MASK		0x70000000

#define ADDR_BANK_SHIFT		28

/* ECC statistic register definitions */

#define STAT_UECNT_MASK		0xFF

#define STAT_CECNT_MASK		0xFF00

#define STAT_CECNT_SHIFT	8

/* ECC scrub register definitions */

#define SCRUB_MODE_MASK		0x7

#define SCRUB_MODE_SECDED	0x4

/**
 * struct ecc_error_info - ECC error log information
 * @row:        Row number
 * @col:        Column number
 * @bank:       Bank number
 * @bitpos:     Bit position
 * @data:       Data causing the error
 */

struct ecc_error_info {
	
u32 row;
	
u32 col;
	
u32 bank;
	
u32 bitpos;
	
u32 data;
};

/**
 * struct synps_ecc_status - ECC status information to report
 * @ce_cnt:     Correctable error count
 * @ue_cnt:     Uncorrectable error count
 * @ceinfo:     Correctable error log information
 * @ueinfo:     Uncorrectable error log information
 */

struct synps_ecc_status {
	
u32 ce_cnt;
	
u32 ue_cnt;
	
struct ecc_error_info ceinfo;
	
struct ecc_error_info ueinfo;
};

/**
 * struct synps_edac_priv - DDR memory controller private instance data
 * @baseaddr:   Base address of the DDR controller
 * @message:    Buffer for framing the event specific info
 * @stat:       ECC status information
 * @ce_cnt:     Correctable Error count
 * @ue_cnt:     Uncorrectable Error count
 */

struct synps_edac_priv {
	
void __iomem *baseaddr;
	
char message[SYNPS_EDAC_MSG_SIZE];
	
struct synps_ecc_status stat;
	
u32 ce_cnt;
	
u32 ue_cnt;
};

/**
 * synps_edac_geterror_info - Get the current ecc error info
 * @base:       Pointer to the base address of the ddr memory controller
 * @p:          Pointer to the synopsys ecc status structure
 *
 * Determines there is any ecc error or not
 *
 * Return: one if there is no error otherwise returns zero
 */

static int synps_edac_geterror_info(void __iomem *base, struct synps_ecc_status *p) { u32 regval, clearval = 0; regval = readl(base + STAT_OFST); if (!regval) return 1; p->ce_cnt = (regval & STAT_CECNT_MASK) >> STAT_CECNT_SHIFT; p->ue_cnt = regval & STAT_UECNT_MASK; regval = readl(base + CE_LOG_OFST); if (!(p->ce_cnt && (regval & LOG_VALID))) goto ue_err; p->ceinfo.bitpos = (regval & CE_LOG_BITPOS_MASK) >> CE_LOG_BITPOS_SHIFT; regval = readl(base + CE_ADDR_OFST); p->ceinfo.row = (regval & ADDR_ROW_MASK) >> ADDR_ROW_SHIFT; p->ceinfo.col = regval & ADDR_COL_MASK; p->ceinfo.bank = (regval & ADDR_BANK_MASK) >> ADDR_BANK_SHIFT; p->ceinfo.data = readl(base + CE_DATA_31_0_OFST); edac_dbg(3, "ce bit position: %d data: %d\n", p->ceinfo.bitpos, p->ceinfo.data); clearval = ECC_CTRL_CLR_CE_ERR; ue_err: regval = readl(base + UE_LOG_OFST); if (!(p->ue_cnt && (regval & LOG_VALID))) goto out; regval = readl(base + UE_ADDR_OFST); p->ueinfo.row = (regval & ADDR_ROW_MASK) >> ADDR_ROW_SHIFT; p->ueinfo.col = regval & ADDR_COL_MASK; p->ueinfo.bank = (regval & ADDR_BANK_MASK) >> ADDR_BANK_SHIFT; p->ueinfo.data = readl(base + UE_DATA_31_0_OFST); clearval |= ECC_CTRL_CLR_UE_ERR; out: writel(clearval, base + ECC_CTRL_OFST); writel(0x0, base + ECC_CTRL_OFST); return 0; }

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/** * synps_edac_handle_error - Handle controller error types CE and UE * @mci: Pointer to the edac memory controller instance * @p: Pointer to the synopsys ecc status structure * * Handles the controller ECC correctable and un correctable error. */
static void synps_edac_handle_error(struct mem_ctl_info *mci, struct synps_ecc_status *p) { struct synps_edac_priv *priv = mci->pvt_info; struct ecc_error_info *pinf; if (p->ce_cnt) { pinf = &p->ceinfo; snprintf(priv->message, SYNPS_EDAC_MSG_SIZE, "DDR ECC error type :%s Row %d Bank %d Col %d ", "CE", pinf->row, pinf->bank, pinf->col); edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, p->ce_cnt, 0, 0, 0, 0, 0, -1, priv->message, ""); } if (p->ue_cnt) { pinf = &p->ueinfo; snprintf(priv->message, SYNPS_EDAC_MSG_SIZE, "DDR ECC error type :%s Row %d Bank %d Col %d ", "UE", pinf->row, pinf->bank, pinf->col); edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, p->ue_cnt, 0, 0, 0, 0, 0, -1, priv->message, ""); } memset(p, 0, sizeof(*p)); }

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Punnaiah Choudary Kalluri183100.00%1100.00%
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/** * synps_edac_check - Check controller for ECC errors * @mci: Pointer to the edac memory controller instance * * Used to check and post ECC errors. Called by the polling thread */
static void synps_edac_check(struct mem_ctl_info *mci) { struct synps_edac_priv *priv = mci->pvt_info; int status; status = synps_edac_geterror_info(priv->baseaddr, &priv->stat); if (status) return; priv->ce_cnt += priv->stat.ce_cnt; priv->ue_cnt += priv->stat.ue_cnt; synps_edac_handle_error(mci, &priv->stat); edac_dbg(3, "Total error count ce %d ue %d\n", priv->ce_cnt, priv->ue_cnt); }

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/** * synps_edac_get_dtype - Return the controller memory width * @base: Pointer to the ddr memory controller base address * * Get the EDAC device type width appropriate for the current controller * configuration. * * Return: a device type width enumeration. */
static enum dev_type synps_edac_get_dtype(const void __iomem *base) { enum dev_type dt; u32 width; width = readl(base + CTRL_OFST); width = (width & CTRL_BW_MASK) >> CTRL_BW_SHIFT; switch (width) { case DDRCTL_WDTH_16: dt = DEV_X2; break; case DDRCTL_WDTH_32: dt = DEV_X4; break; default: dt = DEV_UNKNOWN; } return dt; }

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Punnaiah Choudary Kalluri69100.00%1100.00%
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/** * synps_edac_get_eccstate - Return the controller ecc enable/disable status * @base: Pointer to the ddr memory controller base address * * Get the ECC enable/disable status for the controller * * Return: a ecc status boolean i.e true/false - enabled/disabled. */
static bool synps_edac_get_eccstate(void __iomem *base) { enum dev_type dt; u32 ecctype; bool state = false; dt = synps_edac_get_dtype(base); if (dt == DEV_UNKNOWN) return state; ecctype = readl(base + SCRUB_OFST) & SCRUB_MODE_MASK; if ((ecctype == SCRUB_MODE_SECDED) && (dt == DEV_X2)) state = true; return state; }

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/** * synps_edac_get_memsize - reads the size of the attached memory device * * Return: the memory size in bytes */
static u32 synps_edac_get_memsize(void) { struct sysinfo inf; si_meminfo(&inf); return inf.totalram * inf.mem_unit; }

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/** * synps_edac_get_mtype - Returns controller memory type * @base: pointer to the synopsys ecc status structure * * Get the EDAC memory type appropriate for the current controller * configuration. * * Return: a memory type enumeration. */
static enum mem_type synps_edac_get_mtype(const void __iomem *base) { enum mem_type mt; u32 memtype; memtype = readl(base + T_ZQ_OFST); if (memtype & T_ZQ_DDRMODE_MASK) mt = MEM_DDR3; else mt = MEM_DDR2; return mt; }

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Punnaiah Choudary Kalluri47100.00%1100.00%
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/** * synps_edac_init_csrows - Initialize the cs row data * @mci: Pointer to the edac memory controller instance * * Initializes the chip select rows associated with the EDAC memory * controller instance * * Return: Unconditionally 0. */
static int synps_edac_init_csrows(struct mem_ctl_info *mci) { struct csrow_info *csi; struct dimm_info *dimm; struct synps_edac_priv *priv = mci->pvt_info; u32 size; int row, j; for (row = 0; row < mci->nr_csrows; row++) { csi = mci->csrows[row]; size = synps_edac_get_memsize(); for (j = 0; j < csi->nr_channels; j++) { dimm = csi->channels[j]->dimm; dimm->edac_mode = EDAC_FLAG_SECDED; dimm->mtype = synps_edac_get_mtype(priv->baseaddr); dimm->nr_pages = (size >> PAGE_SHIFT) / csi->nr_channels; dimm->grain = SYNPS_EDAC_ERR_GRAIN; dimm->dtype = synps_edac_get_dtype(priv->baseaddr); } } return 0; }

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Punnaiah Choudary Kalluri148100.00%1100.00%
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/** * synps_edac_mc_init - Initialize driver instance * @mci: Pointer to the edac memory controller instance * @pdev: Pointer to the platform_device struct * * Performs initialization of the EDAC memory controller instance and * related driver-private data associated with the memory controller the * instance is bound to. * * Return: Always zero. */
static int synps_edac_mc_init(struct mem_ctl_info *mci, struct platform_device *pdev) { int status; struct synps_edac_priv *priv; mci->pdev = &pdev->dev; priv = mci->pvt_info; platform_set_drvdata(pdev, mci); /* Initialize controller capabilities and configuration */ mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR2; mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; mci->scrub_cap = SCRUB_HW_SRC; mci->scrub_mode = SCRUB_NONE; mci->edac_cap = EDAC_FLAG_SECDED; mci->ctl_name = "synps_ddr_controller"; mci->dev_name = SYNPS_EDAC_MOD_STRING; mci->mod_name = SYNPS_EDAC_MOD_VER; edac_op_state = EDAC_OPSTATE_POLL; mci->edac_check = synps_edac_check; mci->ctl_page_to_phys = NULL; status = synps_edac_init_csrows(mci); return status; }

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Punnaiah Choudary Kalluri125100.00%1100.00%
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/** * synps_edac_mc_probe - Check controller and bind driver * @pdev: Pointer to the platform_device struct * * Probes a specific controller instance for binding with the driver. * * Return: 0 if the controller instance was successfully bound to the * driver; otherwise, < 0 on error. */
static int synps_edac_mc_probe(struct platform_device *pdev) { struct mem_ctl_info *mci; struct edac_mc_layer layers[2]; struct synps_edac_priv *priv; int rc; struct resource *res; void __iomem *baseaddr; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); baseaddr = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(baseaddr)) return PTR_ERR(baseaddr); if (!synps_edac_get_eccstate(baseaddr)) { edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n"); return -ENXIO; } layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; layers[0].size = SYNPS_EDAC_NR_CSROWS; layers[0].is_virt_csrow = true; layers[1].type = EDAC_MC_LAYER_CHANNEL; layers[1].size = SYNPS_EDAC_NR_CHANS; layers[1].is_virt_csrow = false; mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(struct synps_edac_priv)); if (!mci) { edac_printk(KERN_ERR, EDAC_MC, "Failed memory allocation for mc instance\n"); return -ENOMEM; } priv = mci->pvt_info; priv->baseaddr = baseaddr; rc = synps_edac_mc_init(mci, pdev); if (rc) { edac_printk(KERN_ERR, EDAC_MC, "Failed to initialize instance\n"); goto free_edac_mc; } rc = edac_mc_add_mc(mci); if (rc) { edac_printk(KERN_ERR, EDAC_MC, "Failed to register with EDAC core\n"); goto free_edac_mc; } /* * Start capturing the correctable and uncorrectable errors. A write of * 0 starts the counters. */ writel(0x0, baseaddr + ECC_CTRL_OFST); return rc; free_edac_mc: edac_mc_free(mci); return rc; }

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/** * synps_edac_mc_remove - Unbind driver from controller * @pdev: Pointer to the platform_device struct * * Return: Unconditionally 0 */
static int synps_edac_mc_remove(struct platform_device *pdev) { struct mem_ctl_info *mci = platform_get_drvdata(pdev); edac_mc_del_mc(&pdev->dev); edac_mc_free(mci); return 0; }

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Punnaiah Choudary Kalluri37100.00%1100.00%
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static const struct of_device_id synps_edac_match[] = { { .compatible = "xlnx,zynq-ddrc-a05", }, { /* end of table */ } }; MODULE_DEVICE_TABLE(of, synps_edac_match); static struct platform_driver synps_edac_mc_driver = { .driver = { .name = "synopsys-edac", .of_match_table = synps_edac_match, }, .probe = synps_edac_mc_probe, .remove = synps_edac_mc_remove, }; module_platform_driver(synps_edac_mc_driver); MODULE_AUTHOR("Xilinx Inc"); MODULE_DESCRIPTION("Synopsys DDR ECC driver"); MODULE_LICENSE("GPL v2");

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Directory: drivers/edac
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