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linux/drivers/edac/ti_edac.c
Uwe Kleine-König 8312b2bbdd EDAC/ti: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231004131254.2673842-20-u.kleine-koenig@pengutronix.de
2023-11-20 23:30:09 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
*
* Texas Instruments DDR3 ECC error correction and detection driver
*
* 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/init.h>
#include <linux/edac.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include "edac_module.h"
/* EMIF controller registers */
#define EMIF_SDRAM_CONFIG 0x008
#define EMIF_IRQ_STATUS 0x0ac
#define EMIF_IRQ_ENABLE_SET 0x0b4
#define EMIF_ECC_CTRL 0x110
#define EMIF_1B_ECC_ERR_CNT 0x130
#define EMIF_1B_ECC_ERR_THRSH 0x134
#define EMIF_1B_ECC_ERR_ADDR_LOG 0x13c
#define EMIF_2B_ECC_ERR_ADDR_LOG 0x140
/* Bit definitions for EMIF_SDRAM_CONFIG */
#define SDRAM_TYPE_SHIFT 29
#define SDRAM_TYPE_MASK GENMASK(31, 29)
#define SDRAM_TYPE_DDR3 (3 << SDRAM_TYPE_SHIFT)
#define SDRAM_TYPE_DDR2 (2 << SDRAM_TYPE_SHIFT)
#define SDRAM_NARROW_MODE_MASK GENMASK(15, 14)
#define SDRAM_K2_NARROW_MODE_SHIFT 12
#define SDRAM_K2_NARROW_MODE_MASK GENMASK(13, 12)
#define SDRAM_ROWSIZE_SHIFT 7
#define SDRAM_ROWSIZE_MASK GENMASK(9, 7)
#define SDRAM_IBANK_SHIFT 4
#define SDRAM_IBANK_MASK GENMASK(6, 4)
#define SDRAM_K2_IBANK_SHIFT 5
#define SDRAM_K2_IBANK_MASK GENMASK(6, 5)
#define SDRAM_K2_EBANK_SHIFT 3
#define SDRAM_K2_EBANK_MASK BIT(SDRAM_K2_EBANK_SHIFT)
#define SDRAM_PAGESIZE_SHIFT 0
#define SDRAM_PAGESIZE_MASK GENMASK(2, 0)
#define SDRAM_K2_PAGESIZE_SHIFT 0
#define SDRAM_K2_PAGESIZE_MASK GENMASK(1, 0)
#define EMIF_1B_ECC_ERR_THRSH_SHIFT 24
/* IRQ bit definitions */
#define EMIF_1B_ECC_ERR BIT(5)
#define EMIF_2B_ECC_ERR BIT(4)
#define EMIF_WR_ECC_ERR BIT(3)
#define EMIF_SYS_ERR BIT(0)
/* Bit 31 enables ECC and 28 enables RMW */
#define ECC_ENABLED (BIT(31) | BIT(28))
#define EDAC_MOD_NAME "ti-emif-edac"
enum {
EMIF_TYPE_DRA7,
EMIF_TYPE_K2
};
struct ti_edac {
void __iomem *reg;
};
static u32 ti_edac_readl(struct ti_edac *edac, u16 offset)
{
return readl_relaxed(edac->reg + offset);
}
static void ti_edac_writel(struct ti_edac *edac, u32 val, u16 offset)
{
writel_relaxed(val, edac->reg + offset);
}
static irqreturn_t ti_edac_isr(int irq, void *data)
{
struct mem_ctl_info *mci = data;
struct ti_edac *edac = mci->pvt_info;
u32 irq_status;
u32 err_addr;
int err_count;
irq_status = ti_edac_readl(edac, EMIF_IRQ_STATUS);
if (irq_status & EMIF_1B_ECC_ERR) {
err_addr = ti_edac_readl(edac, EMIF_1B_ECC_ERR_ADDR_LOG);
err_count = ti_edac_readl(edac, EMIF_1B_ECC_ERR_CNT);
ti_edac_writel(edac, err_count, EMIF_1B_ECC_ERR_CNT);
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, err_count,
err_addr >> PAGE_SHIFT,
err_addr & ~PAGE_MASK, -1, 0, 0, 0,
mci->ctl_name, "1B");
}
if (irq_status & EMIF_2B_ECC_ERR) {
err_addr = ti_edac_readl(edac, EMIF_2B_ECC_ERR_ADDR_LOG);
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
err_addr >> PAGE_SHIFT,
err_addr & ~PAGE_MASK, -1, 0, 0, 0,
mci->ctl_name, "2B");
}
if (irq_status & EMIF_WR_ECC_ERR)
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
0, 0, -1, 0, 0, 0,
mci->ctl_name, "WR");
ti_edac_writel(edac, irq_status, EMIF_IRQ_STATUS);
return IRQ_HANDLED;
}
static void ti_edac_setup_dimm(struct mem_ctl_info *mci, u32 type)
{
struct dimm_info *dimm;
struct ti_edac *edac = mci->pvt_info;
int bits;
u32 val;
u32 memsize;
dimm = edac_get_dimm(mci, 0, 0, 0);
val = ti_edac_readl(edac, EMIF_SDRAM_CONFIG);
if (type == EMIF_TYPE_DRA7) {
bits = ((val & SDRAM_PAGESIZE_MASK) >> SDRAM_PAGESIZE_SHIFT) + 8;
bits += ((val & SDRAM_ROWSIZE_MASK) >> SDRAM_ROWSIZE_SHIFT) + 9;
bits += (val & SDRAM_IBANK_MASK) >> SDRAM_IBANK_SHIFT;
if (val & SDRAM_NARROW_MODE_MASK) {
bits++;
dimm->dtype = DEV_X16;
} else {
bits += 2;
dimm->dtype = DEV_X32;
}
} else {
bits = 16;
bits += ((val & SDRAM_K2_PAGESIZE_MASK) >>
SDRAM_K2_PAGESIZE_SHIFT) + 8;
bits += (val & SDRAM_K2_IBANK_MASK) >> SDRAM_K2_IBANK_SHIFT;
bits += (val & SDRAM_K2_EBANK_MASK) >> SDRAM_K2_EBANK_SHIFT;
val = (val & SDRAM_K2_NARROW_MODE_MASK) >>
SDRAM_K2_NARROW_MODE_SHIFT;
switch (val) {
case 0:
bits += 3;
dimm->dtype = DEV_X64;
break;
case 1:
bits += 2;
dimm->dtype = DEV_X32;
break;
case 2:
bits++;
dimm->dtype = DEV_X16;
break;
}
}
memsize = 1 << bits;
dimm->nr_pages = memsize >> PAGE_SHIFT;
dimm->grain = 4;
if ((val & SDRAM_TYPE_MASK) == SDRAM_TYPE_DDR2)
dimm->mtype = MEM_DDR2;
else
dimm->mtype = MEM_DDR3;
val = ti_edac_readl(edac, EMIF_ECC_CTRL);
if (val & ECC_ENABLED)
dimm->edac_mode = EDAC_SECDED;
else
dimm->edac_mode = EDAC_NONE;
}
static const struct of_device_id ti_edac_of_match[] = {
{ .compatible = "ti,emif-keystone", .data = (void *)EMIF_TYPE_K2 },
{ .compatible = "ti,emif-dra7xx", .data = (void *)EMIF_TYPE_DRA7 },
{},
};
MODULE_DEVICE_TABLE(of, ti_edac_of_match);
static int _emif_get_id(struct device_node *node)
{
struct device_node *np;
const __be32 *addrp;
u32 addr, my_addr;
int my_id = 0;
addrp = of_get_address(node, 0, NULL, NULL);
my_addr = (u32)of_translate_address(node, addrp);
for_each_matching_node(np, ti_edac_of_match) {
if (np == node)
continue;
addrp = of_get_address(np, 0, NULL, NULL);
addr = (u32)of_translate_address(np, addrp);
edac_printk(KERN_INFO, EDAC_MOD_NAME,
"addr=%x, my_addr=%x\n",
addr, my_addr);
if (addr < my_addr)
my_id++;
}
return my_id;
}
static int ti_edac_probe(struct platform_device *pdev)
{
int error_irq = 0, ret = -ENODEV;
struct device *dev = &pdev->dev;
struct resource *res;
void __iomem *reg;
struct mem_ctl_info *mci;
struct edac_mc_layer layers[1];
const struct of_device_id *id;
struct ti_edac *edac;
int emif_id;
id = of_match_device(ti_edac_of_match, &pdev->dev);
if (!id)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg = devm_ioremap_resource(dev, res);
if (IS_ERR(reg))
return PTR_ERR(reg);
layers[0].type = EDAC_MC_LAYER_ALL_MEM;
layers[0].size = 1;
/* Allocate ID number for our EMIF controller */
emif_id = _emif_get_id(pdev->dev.of_node);
if (emif_id < 0)
return -EINVAL;
mci = edac_mc_alloc(emif_id, 1, layers, sizeof(*edac));
if (!mci)
return -ENOMEM;
mci->pdev = &pdev->dev;
edac = mci->pvt_info;
edac->reg = reg;
platform_set_drvdata(pdev, mci);
mci->mtype_cap = MEM_FLAG_DDR3 | MEM_FLAG_DDR2;
mci->edac_ctl_cap = EDAC_FLAG_SECDED | EDAC_FLAG_NONE;
mci->mod_name = EDAC_MOD_NAME;
mci->ctl_name = id->compatible;
mci->dev_name = dev_name(&pdev->dev);
/* Setup memory layout */
ti_edac_setup_dimm(mci, (u32)(id->data));
/* add EMIF ECC error handler */
error_irq = platform_get_irq(pdev, 0);
if (error_irq < 0) {
ret = error_irq;
goto err;
}
ret = devm_request_irq(dev, error_irq, ti_edac_isr, 0,
"emif-edac-irq", mci);
if (ret) {
edac_printk(KERN_ERR, EDAC_MOD_NAME,
"request_irq fail for EMIF EDAC irq\n");
goto err;
}
ret = edac_mc_add_mc(mci);
if (ret) {
edac_printk(KERN_ERR, EDAC_MOD_NAME,
"Failed to register mci: %d.\n", ret);
goto err;
}
/* Generate an interrupt with each 1b error */
ti_edac_writel(edac, 1 << EMIF_1B_ECC_ERR_THRSH_SHIFT,
EMIF_1B_ECC_ERR_THRSH);
/* Enable interrupts */
ti_edac_writel(edac,
EMIF_1B_ECC_ERR | EMIF_2B_ECC_ERR | EMIF_WR_ECC_ERR,
EMIF_IRQ_ENABLE_SET);
return 0;
err:
edac_mc_free(mci);
return ret;
}
static void ti_edac_remove(struct platform_device *pdev)
{
struct mem_ctl_info *mci = platform_get_drvdata(pdev);
edac_mc_del_mc(&pdev->dev);
edac_mc_free(mci);
}
static struct platform_driver ti_edac_driver = {
.probe = ti_edac_probe,
.remove_new = ti_edac_remove,
.driver = {
.name = EDAC_MOD_NAME,
.of_match_table = ti_edac_of_match,
},
};
module_platform_driver(ti_edac_driver);
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("EDAC Driver for Texas Instruments DDR3 MC");
MODULE_LICENSE("GPL v2");
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