drivers/edac/amd76x_edac.c - arm/linux - Git at Google

 /*
  * AMD 76x Memory Controller kernel module
  * (C) 2003 Linux Networx (http://lnxi.com)
  * This file may be distributed under the terms of the
  * GNU General Public License.
  *
  * Written by Thayne Harbaugh
  * Based on work by Dan Hollis <goemon at anime dot net> and others.
  *	http://www.anime.net/~goemon/linux-ecc/
  *
  * $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $
  *
  */


 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/init.h>

 #include <linux/pci.h>
 #include <linux/pci_ids.h>

 #include <linux/slab.h>

 #include "edac_mc.h"


 #define amd76x_printk(level, fmt, arg...) \
     edac_printk(level, "amd76x", fmt, ##arg)


 #define amd76x_mc_printk(mci, level, fmt, arg...) \
     edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)


 #define AMD76X_NR_CSROWS 8
 #define AMD76X_NR_CHANS  1
 #define AMD76X_NR_DIMMS  4


 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */
 #define AMD76X_ECC_MODE_STATUS	0x48	/* Mode and status of ECC (32b)
 					 *
 					 * 31:16 reserved
 					 * 15:14 SERR enabled: x1=ue 1x=ce
 					 * 13    reserved
 					 * 12    diag: disabled, enabled
 					 * 11:10 mode: dis, EC, ECC, ECC+scrub
 					 *  9:8  status: x1=ue 1x=ce
 					 *  7:4  UE cs row
 					 *  3:0  CE cs row
 					 */
 #define AMD76X_DRAM_MODE_STATUS	0x58	/* DRAM Mode and status (32b)
 					 *
 					 * 31:26 clock disable 5 - 0
 					 * 25    SDRAM init
 					 * 24    reserved
 					 * 23    mode register service
 					 * 22:21 suspend to RAM
 					 * 20    burst refresh enable
 					 * 19    refresh disable
 					 * 18    reserved
 					 * 17:16 cycles-per-refresh
 					 * 15:8  reserved
 					 *  7:0  x4 mode enable 7 - 0
 					 */
 #define AMD76X_MEM_BASE_ADDR	0xC0	/* Memory base address (8 x 32b)
 					 *
 					 * 31:23 chip-select base
 					 * 22:16 reserved
 					 * 15:7  chip-select mask
 					 *  6:3  reserved
 					 *  2:1  address mode
 					 *  0    chip-select enable
 					 */


 struct amd76x_error_info {
 	u32 ecc_mode_status;
 };


 enum amd76x_chips {
 	AMD761 = 0,
 	AMD762
 };


 struct amd76x_dev_info {
 	const char *ctl_name;
 };


 static const struct amd76x_dev_info amd76x_devs[] = {
 	[AMD761] = {.ctl_name = "AMD761"},
 	[AMD762] = {.ctl_name = "AMD762"},
 };


 /**
  *	amd76x_get_error_info	-	fetch error information
  *	@mci: Memory controller
  *	@info: Info to fill in
  *
  *	Fetch and store the AMD76x ECC status. Clear pending status
  *	on the chip so that further errors will be reported
  */

 static void amd76x_get_error_info (struct mem_ctl_info *mci,
 				   struct amd76x_error_info *info)
 {
 	pci_read_config_dword(mci->pdev, AMD76X_ECC_MODE_STATUS,
 				&info->ecc_mode_status);

 	if (info->ecc_mode_status & BIT(8))
 		pci_write_bits32(mci->pdev, AMD76X_ECC_MODE_STATUS,
 				   (u32) BIT(8), (u32) BIT(8));

 	if (info->ecc_mode_status & BIT(9))
 		pci_write_bits32(mci->pdev, AMD76X_ECC_MODE_STATUS,
 				   (u32) BIT(9), (u32) BIT(9));
 }


 /**
  *	amd76x_process_error_info	-	Error check
  *	@mci: Memory controller
  *	@info: Previously fetched information from chip
  *	@handle_errors: 1 if we should do recovery
  *
  *	Process the chip state and decide if an error has occurred.
  *	A return of 1 indicates an error. Also if handle_errors is true
  *	then attempt to handle and clean up after the error
  */

 static int amd76x_process_error_info (struct mem_ctl_info *mci,
 		struct amd76x_error_info *info, int handle_errors)
 {
 	int error_found;
 	u32 row;

 	error_found = 0;

 	/*
 	 *	Check for an uncorrectable error
 	 */
 	if (info->ecc_mode_status & BIT(8)) {
 		error_found = 1;

 		if (handle_errors) {
 			row = (info->ecc_mode_status >> 4) & 0xf;
 			edac_mc_handle_ue(mci,
 			    mci->csrows[row].first_page, 0, row,
 			    mci->ctl_name);
 		}
 	}

 	/*
 	 *	Check for a correctable error
 	 */
 	if (info->ecc_mode_status & BIT(9)) {
 		error_found = 1;

 		if (handle_errors) {
 			row = info->ecc_mode_status & 0xf;
 			edac_mc_handle_ce(mci,
 			    mci->csrows[row].first_page, 0, 0, row, 0,
 			    mci->ctl_name);
 		}
 	}
 	return error_found;
 }

 /**
  *	amd76x_check	-	Poll the controller
  *	@mci: Memory controller
  *
  *	Called by the poll handlers this function reads the status
  *	from the controller and checks for errors.
  */

 static void amd76x_check(struct mem_ctl_info *mci)
 {
 	struct amd76x_error_info info;
 	debugf3("%s()\n", __func__);
 	amd76x_get_error_info(mci, &info);
 	amd76x_process_error_info(mci, &info, 1);
 }


 /**
  *	amd76x_probe1	-	Perform set up for detected device
  *	@pdev; PCI device detected
  *	@dev_idx: Device type index
  *
  *	We have found an AMD76x and now need to set up the memory
  *	controller status reporting. We configure and set up the
  *	memory controller reporting and claim the device.
  */

 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 {
 	int rc = -ENODEV;
 	int index;
 	struct mem_ctl_info *mci = NULL;
 	enum edac_type ems_modes[] = {
 		EDAC_NONE,
 		EDAC_EC,
 		EDAC_SECDED,
 		EDAC_SECDED
 	};
 	u32 ems;
 	u32 ems_mode;
 	struct amd76x_error_info discard;

 	debugf0("%s()\n", __func__);

 	pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
 	ems_mode = (ems >> 10) & 0x3;

 	mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS);

 	if (mci == NULL) {
 		rc = -ENOMEM;
 		goto fail;
 	}

 	debugf0("%s(): mci = %p\n", __func__, mci);

 	mci->pdev = pdev;
 	mci->mtype_cap = MEM_FLAG_RDDR;

 	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 	mci->edac_cap = ems_mode ?
 	    (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;

 	mci->mod_name = EDAC_MOD_STR;
 	mci->mod_ver = "$Revision: 1.4.2.5 $";
 	mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
 	mci->edac_check = amd76x_check;
 	mci->ctl_page_to_phys = NULL;

 	for (index = 0; index < mci->nr_csrows; index++) {
 		struct csrow_info *csrow = &mci->csrows[index];
 		u32 mba;
 		u32 mba_base;
 		u32 mba_mask;
 		u32 dms;

 		/* find the DRAM Chip Select Base address and mask */
 		pci_read_config_dword(mci->pdev,
 				      AMD76X_MEM_BASE_ADDR + (index * 4),
 				      &mba);

 		if (!(mba & BIT(0)))
 			continue;

 		mba_base = mba & 0xff800000UL;
 		mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;

 		pci_read_config_dword(mci->pdev, AMD76X_DRAM_MODE_STATUS,
 				      &dms);

 		csrow->first_page = mba_base >> PAGE_SHIFT;
 		csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
 		csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 		csrow->page_mask = mba_mask >> PAGE_SHIFT;
 		csrow->grain = csrow->nr_pages << PAGE_SHIFT;
 		csrow->mtype = MEM_RDDR;
 		csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
 		csrow->edac_mode = ems_modes[ems_mode];
 	}

 	amd76x_get_error_info(mci, &discard);  /* clear counters */

 	if (edac_mc_add_mc(mci)) {
 		debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 		goto fail;
 	}

 	/* get this far and it's successful */
 	debugf3("%s(): success\n", __func__);
 	return 0;

 fail:
 	if (mci != NULL)
 		edac_mc_free(mci);
 	return rc;
 }

 /* returns count (>= 0), or negative on error */
 static int __devinit amd76x_init_one(struct pci_dev *pdev,
 				     const struct pci_device_id *ent)
 {
 	debugf0("%s()\n", __func__);

 	/* don't need to call pci_device_enable() */
 	return amd76x_probe1(pdev, ent->driver_data);
 }


 /**
  *	amd76x_remove_one	-	driver shutdown
  *	@pdev: PCI device being handed back
  *
  *	Called when the driver is unloaded. Find the matching mci
  *	structure for the device then delete the mci and free the
  *	resources.
  */

 static void __devexit amd76x_remove_one(struct pci_dev *pdev)
 {
 	struct mem_ctl_info *mci;

 	debugf0("%s()\n", __func__);

 	if ((mci = edac_mc_find_mci_by_pdev(pdev)) == NULL)
 		return;
 	if (edac_mc_del_mc(mci))
 		return;
 	edac_mc_free(mci);
 }


 static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = {
 	{PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	 AMD762},
 	{PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 	 AMD761},
 	{0,}			/* 0 terminated list. */
 };

 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);


 static struct pci_driver amd76x_driver = {
 	.name = EDAC_MOD_STR,
 	.probe = amd76x_init_one,
 	.remove = __devexit_p(amd76x_remove_one),
 	.id_table = amd76x_pci_tbl,
 };

 static int __init amd76x_init(void)
 {
 	return pci_register_driver(&amd76x_driver);
 }

 static void __exit amd76x_exit(void)
 {
 	pci_unregister_driver(&amd76x_driver);
 }

 module_init(amd76x_init);
 module_exit(amd76x_exit);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
	/*
	* AMD 76x Memory Controller kernel module
	* (C) 2003 Linux Networx (http://lnxi.com)
	* This file may be distributed under the terms of the
	* GNU General Public License.
	*
	* Written by Thayne Harbaugh
	* Based on work by Dan Hollis <goemon at anime dot net> and others.
	* http://www.anime.net/~goemon/linux-ecc/
	*
	* $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $
	*
	*/


	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/init.h>

	#include <linux/pci.h>
	#include <linux/pci_ids.h>

	#include <linux/slab.h>

	#include "edac_mc.h"


	#define amd76x_printk(level, fmt, arg...) \
	edac_printk(level, "amd76x", fmt, ##arg)


	#define amd76x_mc_printk(mci, level, fmt, arg...) \
	edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)


	#define AMD76X_NR_CSROWS 8
	#define AMD76X_NR_CHANS 1
	#define AMD76X_NR_DIMMS 4


	/* AMD 76x register addresses - device 0 function 0 - PCI bridge */
	#define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b)
	*
	* 31:16 reserved
	* 15:14 SERR enabled: x1=ue 1x=ce
	* 13 reserved
	* 12 diag: disabled, enabled
	* 11:10 mode: dis, EC, ECC, ECC+scrub
	* 9:8 status: x1=ue 1x=ce
	* 7:4 UE cs row
	* 3:0 CE cs row
	*/
	#define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b)
	*
	* 31:26 clock disable 5 - 0
	* 25 SDRAM init
	* 24 reserved
	* 23 mode register service
	* 22:21 suspend to RAM
	* 20 burst refresh enable
	* 19 refresh disable
	* 18 reserved
	* 17:16 cycles-per-refresh
	* 15:8 reserved
	* 7:0 x4 mode enable 7 - 0
	*/
	#define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b)
	*
	* 31:23 chip-select base
	* 22:16 reserved
	* 15:7 chip-select mask
	* 6:3 reserved
	* 2:1 address mode
	* 0 chip-select enable
	*/


	struct amd76x_error_info {
	u32 ecc_mode_status;
	};


	enum amd76x_chips {
	AMD761 = 0,
	AMD762
	};


	struct amd76x_dev_info {
	const char *ctl_name;
	};


	static const struct amd76x_dev_info amd76x_devs[] = {
	[AMD761] = {.ctl_name = "AMD761"},
	[AMD762] = {.ctl_name = "AMD762"},
	};


	/**
	* amd76x_get_error_info - fetch error information
	* @mci: Memory controller
	* @info: Info to fill in
	*
	* Fetch and store the AMD76x ECC status. Clear pending status
	* on the chip so that further errors will be reported
	*/

	static void amd76x_get_error_info (struct mem_ctl_info *mci,
	struct amd76x_error_info *info)
	{
	pci_read_config_dword(mci->pdev, AMD76X_ECC_MODE_STATUS,
	&info->ecc_mode_status);

	if (info->ecc_mode_status & BIT(8))
	pci_write_bits32(mci->pdev, AMD76X_ECC_MODE_STATUS,
	(u32) BIT(8), (u32) BIT(8));

	if (info->ecc_mode_status & BIT(9))
	pci_write_bits32(mci->pdev, AMD76X_ECC_MODE_STATUS,
	(u32) BIT(9), (u32) BIT(9));
	}


	/**
	* amd76x_process_error_info - Error check
	* @mci: Memory controller
	* @info: Previously fetched information from chip
	* @handle_errors: 1 if we should do recovery
	*
	* Process the chip state and decide if an error has occurred.
	* A return of 1 indicates an error. Also if handle_errors is true
	* then attempt to handle and clean up after the error
	*/

	static int amd76x_process_error_info (struct mem_ctl_info *mci,
	struct amd76x_error_info *info, int handle_errors)
	{
	int error_found;
	u32 row;

	error_found = 0;

	/*
	* Check for an uncorrectable error
	*/
	if (info->ecc_mode_status & BIT(8)) {
	error_found = 1;

	if (handle_errors) {
	row = (info->ecc_mode_status >> 4) & 0xf;
	edac_mc_handle_ue(mci,
	mci->csrows[row].first_page, 0, row,
	mci->ctl_name);
	}
	}

	/*
	* Check for a correctable error
	*/
	if (info->ecc_mode_status & BIT(9)) {
	error_found = 1;

	if (handle_errors) {
	row = info->ecc_mode_status & 0xf;
	edac_mc_handle_ce(mci,
	mci->csrows[row].first_page, 0, 0, row, 0,
	mci->ctl_name);
	}
	}
	return error_found;
	}

	/**
	* amd76x_check - Poll the controller
	* @mci: Memory controller
	*
	* Called by the poll handlers this function reads the status
	* from the controller and checks for errors.
	*/

	static void amd76x_check(struct mem_ctl_info *mci)
	{
	struct amd76x_error_info info;
	debugf3("%s()\n", __func__);
	amd76x_get_error_info(mci, &info);
	amd76x_process_error_info(mci, &info, 1);
	}


	/**
	* amd76x_probe1 - Perform set up for detected device
	* @pdev; PCI device detected
	* @dev_idx: Device type index
	*
	* We have found an AMD76x and now need to set up the memory
	* controller status reporting. We configure and set up the
	* memory controller reporting and claim the device.
	*/

	static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
	{
	int rc = -ENODEV;
	int index;
	struct mem_ctl_info *mci = NULL;
	enum edac_type ems_modes[] = {
	EDAC_NONE,
	EDAC_EC,
	EDAC_SECDED,
	EDAC_SECDED
	};
	u32 ems;
	u32 ems_mode;
	struct amd76x_error_info discard;

	debugf0("%s()\n", __func__);

	pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
	ems_mode = (ems >> 10) & 0x3;

	mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS);

	if (mci == NULL) {
	rc = -ENOMEM;
	goto fail;
	}

	debugf0("%s(): mci = %p\n", __func__, mci);

	mci->pdev = pdev;
	mci->mtype_cap = MEM_FLAG_RDDR;

	mci->edac_ctl_cap = EDAC_FLAG_NONE \| EDAC_FLAG_EC \| EDAC_FLAG_SECDED;
	mci->edac_cap = ems_mode ?
	(EDAC_FLAG_EC \| EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;

	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = "$Revision: 1.4.2.5 $";
	mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
	mci->edac_check = amd76x_check;
	mci->ctl_page_to_phys = NULL;

	for (index = 0; index < mci->nr_csrows; index++) {
	struct csrow_info *csrow = &mci->csrows[index];
	u32 mba;
	u32 mba_base;
	u32 mba_mask;
	u32 dms;

	/* find the DRAM Chip Select Base address and mask */
	pci_read_config_dword(mci->pdev,
	AMD76X_MEM_BASE_ADDR + (index * 4),
	&mba);

	if (!(mba & BIT(0)))
	continue;

	mba_base = mba & 0xff800000UL;
	mba_mask = ((mba & 0xff80) << 16) \| 0x7fffffUL;

	pci_read_config_dword(mci->pdev, AMD76X_DRAM_MODE_STATUS,
	&dms);

	csrow->first_page = mba_base >> PAGE_SHIFT;
	csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
	csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
	csrow->page_mask = mba_mask >> PAGE_SHIFT;
	csrow->grain = csrow->nr_pages << PAGE_SHIFT;
	csrow->mtype = MEM_RDDR;
	csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
	csrow->edac_mode = ems_modes[ems_mode];
	}

	amd76x_get_error_info(mci, &discard); /* clear counters */

	if (edac_mc_add_mc(mci)) {
	debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
	goto fail;
	}

	/* get this far and it's successful */
	debugf3("%s(): success\n", __func__);
	return 0;

	fail:
	if (mci != NULL)
	edac_mc_free(mci);
	return rc;
	}

	/* returns count (>= 0), or negative on error */
	static int __devinit amd76x_init_one(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	debugf0("%s()\n", __func__);

	/* don't need to call pci_device_enable() */
	return amd76x_probe1(pdev, ent->driver_data);
	}


	/**
	* amd76x_remove_one - driver shutdown
	* @pdev: PCI device being handed back
	*
	* Called when the driver is unloaded. Find the matching mci
	* structure for the device then delete the mci and free the
	* resources.
	*/

	static void __devexit amd76x_remove_one(struct pci_dev *pdev)
	{
	struct mem_ctl_info *mci;

	debugf0("%s()\n", __func__);

	if ((mci = edac_mc_find_mci_by_pdev(pdev)) == NULL)
	return;
	if (edac_mc_del_mc(mci))
	return;
	edac_mc_free(mci);
	}


	static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = {
	{PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	AMD762},
	{PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	AMD761},
	{0,} /* 0 terminated list. */
	};

	MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);


	static struct pci_driver amd76x_driver = {
	.name = EDAC_MOD_STR,
	.probe = amd76x_init_one,
	.remove = __devexit_p(amd76x_remove_one),
	.id_table = amd76x_pci_tbl,
	};

	static int __init amd76x_init(void)
	{
	return pci_register_driver(&amd76x_driver);
	}

	static void __exit amd76x_exit(void)
	{
	pci_unregister_driver(&amd76x_driver);
	}

	module_init(amd76x_init);
	module_exit(amd76x_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
	MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");