/*
* 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/>.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/edac.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>
#include <linux/uaccess.h>
#include "edac_core.h"
#include "edac_module.h"
/* DDR Ctrlr Error Registers */
#define HB_DDR_ECC_OPT 0x128
#define HB_DDR_ECC_U_ERR_ADDR 0x130
#define HB_DDR_ECC_U_ERR_STAT 0x134
#define HB_DDR_ECC_U_ERR_DATAL 0x138
#define HB_DDR_ECC_U_ERR_DATAH 0x13c
#define HB_DDR_ECC_C_ERR_ADDR 0x140
#define HB_DDR_ECC_C_ERR_STAT 0x144
#define HB_DDR_ECC_C_ERR_DATAL 0x148
#define HB_DDR_ECC_C_ERR_DATAH 0x14c
#define HB_DDR_ECC_INT_STATUS 0x180
#define HB_DDR_ECC_INT_ACK 0x184
#define HB_DDR_ECC_U_ERR_ID 0x424
#define HB_DDR_ECC_C_ERR_ID 0x428
#define HB_DDR_ECC_INT_STAT_CE 0x8
#define HB_DDR_ECC_INT_STAT_DOUBLE_CE 0x10
#define HB_DDR_ECC_INT_STAT_UE 0x20
#define HB_DDR_ECC_INT_STAT_DOUBLE_UE 0x40
#define HB_DDR_ECC_OPT_MODE_MASK 0x3
#define HB_DDR_ECC_OPT_FWC 0x100
#define HB_DDR_ECC_OPT_XOR_SHIFT 16
struct hb_mc_drvdata {
void __iomem *mc_vbase;
};
static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
{
struct mem_ctl_info *mci = dev_id;
struct hb_mc_drvdata *drvdata = mci->pvt_info;
u32 status, err_addr;
/* Read the interrupt status register */
status = readl(drvdata->mc_vbase + HB_DDR_ECC_INT_STATUS);
if (status & HB_DDR_ECC_INT_STAT_UE) {
err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_U_ERR_ADDR);
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
err_addr >> PAGE_SHIFT,
err_addr & ~PAGE_MASK, 0,
0, 0, -1,
mci->ctl_name, "");
}
if (status & HB_DDR_ECC_INT_STAT_CE) {
u32 syndrome = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_STAT);
syndrome = (syndrome >> 8) & 0xff;
err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_ADDR);
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
err_addr >> PAGE_SHIFT,
err_addr & ~PAGE_MASK, syndrome,
0, 0, -1,
mci->ctl_name, "");
}
/* clear the error, clears the interrupt */
writel(status, drvdata->mc_vbase + HB_DDR_ECC_INT_ACK);
return IRQ_HANDLED;
}
#ifdef CONFIG_EDAC_DEBUG
static ssize_t highbank_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 hb_mc_drvdata *pdata = mci->pvt_info;
char buf[32];
size_t buf_size;
u32 reg;
u8 synd;
buf_size = min(count, (sizeof(buf)-1));
if (copy_from_user(buf, data, buf_size))
return -EFAULT;
buf[buf_size] = 0;
if (!kstrtou8(buf, 16, &synd)) {
reg = readl(pdata->mc_vbase + HB_DDR_ECC_OPT);
reg &= HB_DDR_ECC_OPT_MODE_MASK;
reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
writel(reg, pdata->mc_vbase + HB_DDR_ECC_OPT);
}
return count;
}
static const struct file_operations highbank_mc_debug_inject_fops = {
.open = simple_open,
.write = highbank_mc_err_inject_write,
.llseek = generic_file_llseek,
};
static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
{
if (mci->debugfs)
debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci,
&highbank_mc_debug_inject_fops);
;
}
#else
static void highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
{}
#endif
static int highbank_mc_probe(struct platform_device *pdev)
{
struct edac_mc_layer layers[2];
struct mem_ctl_info *mci;
struct hb_mc_drvdata *drvdata;
struct dimm_info *dimm;
struct resource *r;
u32 control;
int irq;
int res = 0;
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 hb_mc_drvdata));
if (!mci)
return -ENOMEM;
mci->pdev = &pdev->dev;
drvdata = mci->pvt_info;
platform_set_drvdata(pdev, mci);
if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
return -ENOMEM;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(&pdev->dev, "Unable to get mem resource\n");
res = -ENODEV;
goto err;
}
if (!devm_request_mem_region(&pdev->dev, r->start,
resource_size(r), dev_name(&pdev->dev))) {
dev_err(&pdev->dev, "Error while requesting mem region\n");
res = -EBUSY;
goto err;
}
drvdata->mc_vbase = devm_ioremap(&pdev->dev,
r->start, resource_size(r));
if (!drvdata->mc_vbase) {
dev_err(&pdev->dev, "Unable to map regs\n");
res = -ENOMEM;
goto err;
}
control = readl(drvdata->mc_vbase + HB_DDR_ECC_OPT) & 0x3;
if (!control || (control == 0x2)) {
dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
res = -ENODEV;
goto err;
}
irq = platform_get_irq(pdev, 0);
res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
0, dev_name(&pdev->dev), mci);
if (res < 0) {
dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
goto err;
}
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 = dev_name(&pdev->dev);
mci->mod_ver = "1";
mci->ctl_name = dev_name(&pdev->dev);
mci->scrub_mode = SCRUB_SW_SRC;
/* Only a single 4GB DIMM is supported */
dimm = *mci->dimms;
dimm->nr_pages = (~0UL >> 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;
highbank_mc_create_debugfs_nodes(mci);
devres_close_group(&pdev->dev, NULL);
return 0;
err:
devres_release_group(&pdev->dev, NULL);
edac_mc_free(mci);
return res;
}
static int highbank_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;
}
static const struct of_device_id hb_ddr_ctrl_of_match[] = {
{ .compatible = "calxeda,hb-ddr-ctrl", },
{},
};
MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match);
static struct platform_driver highbank_mc_edac_driver = {
.probe = highbank_mc_probe,
.remove = highbank_mc_remove,
.driver = {
.name = "hb_mc_edac",
.of_match_table = hb_ddr_ctrl_of_match,
},
};
module_platform_driver(highbank_mc_edac_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Calxeda, Inc.");
MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank");
