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linux-next/drivers/edac/altera_edac.c
Thor Thayer 71bcada88b edac: altera: Add Altera SDRAM EDAC support 
This patch adds support for the CycloneV and ArriaV SDRAM controllers.
Correction and reporting of SBEs, Panic on DBEs.

There was a discussion thread on whether this driver should be an mfd driver
or just make use of syscon, which is already a mfd. Ultimately, the
decision to use a simple syscon interface was reached.[1]

[1] https://lkml.org/lkml/2014/7/30/514

[dinguyen] Fixed Kconfig to have EDAC_ALTERA_MC as a tristate to prevent a
build failure for allmodconfig.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Acked-by: Borislav Petkov <bp@suse.de>
[dinguyen] cleaned up commit message
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
2014-09-04 13:41:46 -05:00

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/*
* Copyright Altera Corporation (C) 2014. All rights reserved.
* Copyright 2011-2012 Calxeda, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
* Adapted from the highbank_mc_edac driver.
*/
#include <linux/ctype.h>
#include <linux/edac.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include "edac_core.h"
#include "edac_module.h"
#define EDAC_MOD_STR "altera_edac"
#define EDAC_VERSION "1"
/* SDRAM Controller CtrlCfg Register */
#define CTLCFG_OFST 0x00
/* SDRAM Controller CtrlCfg Register Bit Masks */
#define CTLCFG_ECC_EN 0x400
#define CTLCFG_ECC_CORR_EN 0x800
#define CTLCFG_GEN_SB_ERR 0x2000
#define CTLCFG_GEN_DB_ERR 0x4000
#define CTLCFG_ECC_AUTO_EN (CTLCFG_ECC_EN | \
CTLCFG_ECC_CORR_EN)
/* SDRAM Controller Address Width Register */
#define DRAMADDRW_OFST 0x2C
/* SDRAM Controller Address Widths Field Register */
#define DRAMADDRW_COLBIT_MASK 0x001F
#define DRAMADDRW_COLBIT_SHIFT 0
#define DRAMADDRW_ROWBIT_MASK 0x03E0
#define DRAMADDRW_ROWBIT_SHIFT 5
#define DRAMADDRW_BANKBIT_MASK 0x1C00
#define DRAMADDRW_BANKBIT_SHIFT 10
#define DRAMADDRW_CSBIT_MASK 0xE000
#define DRAMADDRW_CSBIT_SHIFT 13
/* SDRAM Controller Interface Data Width Register */
#define DRAMIFWIDTH_OFST 0x30
/* SDRAM Controller Interface Data Width Defines */
#define DRAMIFWIDTH_16B_ECC 24
#define DRAMIFWIDTH_32B_ECC 40
/* SDRAM Controller DRAM Status Register */
#define DRAMSTS_OFST 0x38
/* SDRAM Controller DRAM Status Register Bit Masks */
#define DRAMSTS_SBEERR 0x04
#define DRAMSTS_DBEERR 0x08
#define DRAMSTS_CORR_DROP 0x10
/* SDRAM Controller DRAM IRQ Register */
#define DRAMINTR_OFST 0x3C
/* SDRAM Controller DRAM IRQ Register Bit Masks */
#define DRAMINTR_INTREN 0x01
#define DRAMINTR_SBEMASK 0x02
#define DRAMINTR_DBEMASK 0x04
#define DRAMINTR_CORRDROPMASK 0x08
#define DRAMINTR_INTRCLR 0x10
/* SDRAM Controller Single Bit Error Count Register */
#define SBECOUNT_OFST 0x40
/* SDRAM Controller Single Bit Error Count Register Bit Masks */
#define SBECOUNT_MASK 0x0F
/* SDRAM Controller Double Bit Error Count Register */
#define DBECOUNT_OFST 0x44
/* SDRAM Controller Double Bit Error Count Register Bit Masks */
#define DBECOUNT_MASK 0x0F
/* SDRAM Controller ECC Error Address Register */
#define ERRADDR_OFST 0x48
/* SDRAM Controller ECC Error Address Register Bit Masks */
#define ERRADDR_MASK 0xFFFFFFFF
/* Altera SDRAM Memory Controller data */
struct altr_sdram_mc_data {
struct regmap *mc_vbase;
};
static irqreturn_t altr_sdram_mc_err_handler(int irq, void *dev_id)
{
struct mem_ctl_info *mci = dev_id;
struct altr_sdram_mc_data *drvdata = mci->pvt_info;
u32 status, err_count, err_addr;
/* Error Address is shared by both SBE & DBE */
regmap_read(drvdata->mc_vbase, ERRADDR_OFST, &err_addr);
regmap_read(drvdata->mc_vbase, DRAMSTS_OFST, &status);
if (status & DRAMSTS_DBEERR) {
regmap_read(drvdata->mc_vbase, DBECOUNT_OFST, &err_count);
panic("\nEDAC: [%d Uncorrectable errors @ 0x%08X]\n",
err_count, err_addr);
}
if (status & DRAMSTS_SBEERR) {
regmap_read(drvdata->mc_vbase, SBECOUNT_OFST, &err_count);
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
err_addr >> PAGE_SHIFT,
err_addr & ~PAGE_MASK, 0,
0, 0, -1, mci->ctl_name, "");
}
regmap_write(drvdata->mc_vbase, DRAMINTR_OFST,
(DRAMINTR_INTRCLR | DRAMINTR_INTREN));
return IRQ_HANDLED;
}
#ifdef CONFIG_EDAC_DEBUG
static ssize_t altr_sdr_mc_err_inject_write(struct file *file,
const char __user *data,
size_t count, loff_t *ppos)
{
struct mem_ctl_info *mci = file->private_data;
struct altr_sdram_mc_data *drvdata = mci->pvt_info;
u32 *ptemp;
dma_addr_t dma_handle;
u32 reg, read_reg;
ptemp = dma_alloc_coherent(mci->pdev, 16, &dma_handle, GFP_KERNEL);
if (!ptemp) {
dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
edac_printk(KERN_ERR, EDAC_MC,
"Inject: Buffer Allocation error\n");
return -ENOMEM;
}
regmap_read(drvdata->mc_vbase, CTLCFG_OFST, &read_reg);
read_reg &= ~(CTLCFG_GEN_SB_ERR | CTLCFG_GEN_DB_ERR);
/* Error are injected by writing a word while the SBE or DBE
* bit in the CTLCFG register is set. Reading the word will
* trigger the SBE or DBE error and the corresponding IRQ.
*/
if (count == 3) {
edac_printk(KERN_ALERT, EDAC_MC,
"Inject Double bit error\n");
regmap_write(drvdata->mc_vbase, CTLCFG_OFST,
(read_reg | CTLCFG_GEN_DB_ERR));
} else {
edac_printk(KERN_ALERT, EDAC_MC,
"Inject Single bit error\n");
regmap_write(drvdata->mc_vbase, CTLCFG_OFST,
(read_reg | CTLCFG_GEN_SB_ERR));
}
ptemp[0] = 0x5A5A5A5A;
ptemp[1] = 0xA5A5A5A5;
/* Clear the error injection bits */
regmap_write(drvdata->mc_vbase, CTLCFG_OFST, read_reg);
/* Ensure it has been written out */
wmb();
/*
* To trigger the error, we need to read the data back
* (the data was written with errors above).
* The ACCESS_ONCE macros and printk are used to prevent the
* the compiler optimizing these reads out.
*/
reg = ACCESS_ONCE(ptemp[0]);
read_reg = ACCESS_ONCE(ptemp[1]);
/* Force Read */
rmb();
edac_printk(KERN_ALERT, EDAC_MC, "Read Data [0x%X, 0x%X]\n",
reg, read_reg);
dma_free_coherent(mci->pdev, 16, ptemp, dma_handle);
return count;
}
static const struct file_operations altr_sdr_mc_debug_inject_fops = {
.open = simple_open,
.write = altr_sdr_mc_err_inject_write,
.llseek = generic_file_llseek,
};
static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
{
if (mci->debugfs)
debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
&altr_sdr_mc_debug_inject_fops);
}
#else
static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
{}
#endif
/* Get total memory size in bytes */
static u32 altr_sdram_get_total_mem_size(struct regmap *mc_vbase)
{
u32 size, read_reg, row, bank, col, cs, width;
if (regmap_read(mc_vbase, DRAMADDRW_OFST, &read_reg) < 0)
return 0;
if (regmap_read(mc_vbase, DRAMIFWIDTH_OFST, &width) < 0)
return 0;
col = (read_reg & DRAMADDRW_COLBIT_MASK) >>
DRAMADDRW_COLBIT_SHIFT;
row = (read_reg & DRAMADDRW_ROWBIT_MASK) >>
DRAMADDRW_ROWBIT_SHIFT;
bank = (read_reg & DRAMADDRW_BANKBIT_MASK) >>
DRAMADDRW_BANKBIT_SHIFT;
cs = (read_reg & DRAMADDRW_CSBIT_MASK) >>
DRAMADDRW_CSBIT_SHIFT;
/* Correct for ECC as its not addressible */
if (width == DRAMIFWIDTH_32B_ECC)
width = 32;
if (width == DRAMIFWIDTH_16B_ECC)
width = 16;
/* calculate the SDRAM size base on this info */
size = 1 << (row + bank + col);
size = size * cs * (width / 8);
return size;
}
static int altr_sdram_probe(struct platform_device *pdev)
{
struct edac_mc_layer layers[2];
struct mem_ctl_info *mci;
struct altr_sdram_mc_data *drvdata;
struct regmap *mc_vbase;
struct dimm_info *dimm;
u32 read_reg, mem_size;
int irq;
int res = 0;
/* Validate the SDRAM controller has ECC enabled */
/* Grab the register range from the sdr controller in device tree */
mc_vbase = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
"altr,sdr-syscon");
if (IS_ERR(mc_vbase)) {
edac_printk(KERN_ERR, EDAC_MC,
"regmap for altr,sdr-syscon lookup failed.\n");
return -ENODEV;
}
if (regmap_read(mc_vbase, CTLCFG_OFST, &read_reg) ||
((read_reg & CTLCFG_ECC_AUTO_EN) != CTLCFG_ECC_AUTO_EN)) {
edac_printk(KERN_ERR, EDAC_MC,
"No ECC/ECC disabled [0x%08X]\n", read_reg);
return -ENODEV;
}
/* Grab memory size from device tree. */
mem_size = altr_sdram_get_total_mem_size(mc_vbase);
if (!mem_size) {
edac_printk(KERN_ERR, EDAC_MC,
"Unable to calculate memory size\n");
return -ENODEV;
}
/* Ensure the SDRAM Interrupt is disabled and cleared */
if (regmap_write(mc_vbase, DRAMINTR_OFST, DRAMINTR_INTRCLR)) {
edac_printk(KERN_ERR, EDAC_MC,
"Error clearing SDRAM ECC IRQ\n");
return -ENODEV;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
edac_printk(KERN_ERR, EDAC_MC,
"No irq %d in DT\n", irq);
return -ENODEV;
}
layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
layers[0].size = 1;
layers[0].is_virt_csrow = true;
layers[1].type = EDAC_MC_LAYER_CHANNEL;
layers[1].size = 1;
layers[1].is_virt_csrow = false;
mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
sizeof(struct altr_sdram_mc_data));
if (!mci)
return -ENOMEM;
mci->pdev = &pdev->dev;
drvdata = mci->pvt_info;
drvdata->mc_vbase = mc_vbase;
platform_set_drvdata(pdev, mci);
if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
res = -ENOMEM;
goto free;
}
mci->mtype_cap = MEM_FLAG_DDR3;
mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
mci->edac_cap = EDAC_FLAG_SECDED;
mci->mod_name = EDAC_MOD_STR;
mci->mod_ver = EDAC_VERSION;
mci->ctl_name = dev_name(&pdev->dev);
mci->scrub_mode = SCRUB_SW_SRC;
mci->dev_name = dev_name(&pdev->dev);
dimm = *mci->dimms;
dimm->nr_pages = ((mem_size - 1) >> PAGE_SHIFT) + 1;
dimm->grain = 8;
dimm->dtype = DEV_X8;
dimm->mtype = MEM_DDR3;
dimm->edac_mode = EDAC_SECDED;
res = edac_mc_add_mc(mci);
if (res < 0)
goto err;
res = devm_request_irq(&pdev->dev, irq, altr_sdram_mc_err_handler,
0, dev_name(&pdev->dev), mci);
if (res < 0) {
edac_mc_printk(mci, KERN_ERR,
"Unable to request irq %d\n", irq);
res = -ENODEV;
goto err2;
}
if (regmap_write(drvdata->mc_vbase, DRAMINTR_OFST,
(DRAMINTR_INTRCLR | DRAMINTR_INTREN))) {
edac_mc_printk(mci, KERN_ERR,
"Error enabling SDRAM ECC IRQ\n");
res = -ENODEV;
goto err2;
}
altr_sdr_mc_create_debugfs_nodes(mci);
devres_close_group(&pdev->dev, NULL);
return 0;
err2:
edac_mc_del_mc(&pdev->dev);
err:
devres_release_group(&pdev->dev, NULL);
free:
edac_mc_free(mci);
edac_printk(KERN_ERR, EDAC_MC,
"EDAC Probe Failed; Error %d\n", res);
return res;
}
static int altr_sdram_remove(struct platform_device *pdev)
{
struct mem_ctl_info *mci = platform_get_drvdata(pdev);
edac_mc_del_mc(&pdev->dev);
edac_mc_free(mci);
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id altr_sdram_ctrl_of_match[] = {
{ .compatible = "altr,sdram-edac", },
{},
};
MODULE_DEVICE_TABLE(of, altr_sdram_ctrl_of_match);
static struct platform_driver altr_sdram_edac_driver = {
.probe = altr_sdram_probe,
.remove = altr_sdram_remove,
.driver = {
.name = "altr_sdram_edac",
.of_match_table = altr_sdram_ctrl_of_match,
},
};
module_platform_driver(altr_sdram_edac_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Thor Thayer");
MODULE_DESCRIPTION("EDAC Driver for Altera SDRAM Controller");
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