drivers/edac/r82600_edac.c - kernel/msm - Gitiles

 /*
  * Radisys 82600 Embedded chipset Memory Controller kernel module
  * (C) 2005 EADS Astrium
  * This file may be distributed under the terms of the
  * GNU General Public License.
  *
  * Written by Tim Small <tim@buttersideup.com>, based on work by Thayne
  * Harbaugh, Dan Hollis <goemon at anime dot net> and others.
  *
  * $Id: edac_r82600.c,v 1.1.2.6 2005/10/05 00:43:44 dsp_llnl Exp $
  *
  * Written with reference to 82600 High Integration Dual PCI System
  * Controller Data Book:
  * http://www.radisys.com/files/support_downloads/007-01277-0002.82600DataBook.pdf
  * references to this document given in []
  */

 #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"

 /* Radisys say "The 82600 integrates a main memory SDRAM controller that
  * supports up to four banks of memory. The four banks can support a mix of
  * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs,
  * each of which can be any size from 16MB to 512MB. Both registered (control
  * signals buffered) and unbuffered DIMM types are supported. Mixing of
  * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs
  * is not allowed. The 82600 SDRAM interface operates at the same frequency as
  * the CPU bus, 66MHz, 100MHz or 133MHz."
  */

 #define R82600_NR_CSROWS 4
 #define R82600_NR_CHANS  1
 #define R82600_NR_DIMMS  4

 #define R82600_BRIDGE_ID  0x8200

 /* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */
 #define R82600_DRAMC	0x57	/* Various SDRAM related control bits
 				 * all bits are R/W
 				 *
 				 * 7    SDRAM ISA Hole Enable
 				 * 6    Flash Page Mode Enable
 				 * 5    ECC Enable: 1=ECC 0=noECC
 				 * 4    DRAM DIMM Type: 1=
 				 * 3    BIOS Alias Disable
 				 * 2    SDRAM BIOS Flash Write Enable
 				 * 1:0  SDRAM Refresh Rate: 00=Disabled
 				 *          01=7.8usec (256Mbit SDRAMs)
 				 *          10=15.6us 11=125usec
 				 */

 #define R82600_SDRAMC	0x76	/* "SDRAM Control Register"
 				 * More SDRAM related control bits
 				 * all bits are R/W
 				 *
 				 * 15:8 Reserved.
 				 *
 				 * 7:5  Special SDRAM Mode Select
 				 *
 				 * 4    Force ECC
 				 *
 				 *        1=Drive ECC bits to 0 during
 				 *          write cycles (i.e. ECC test mode)
 				 *
 				 *        0=Normal ECC functioning
 				 *
 				 * 3    Enhanced Paging Enable
 				 *
 				 * 2    CAS# Latency 0=3clks 1=2clks
 				 *
 				 * 1    RAS# to CAS# Delay 0=3 1=2
 				 *
 				 * 0    RAS# Precharge     0=3 1=2
 				 */

 #define R82600_EAP	0x80	/* ECC Error Address Pointer Register
 				 *
 				 * 31    Disable Hardware Scrubbing (RW)
 				 *        0=Scrub on corrected read
 				 *        1=Don't scrub on corrected read
 				 *
 				 * 30:12 Error Address Pointer (RO)
 				 *        Upper 19 bits of error address
 				 *
 				 * 11:4  Syndrome Bits (RO)
 				 *
 				 * 3     BSERR# on multibit error (RW)
 				 *        1=enable 0=disable
 				 *
 				 * 2     NMI on Single Bit Eror (RW)
 				 *        1=NMI triggered by SBE n.b. other
 				 *          prerequeists
 				 *        0=NMI not triggered
 				 *
 				 * 1     MBE (R/WC)
 				 *        read 1=MBE at EAP (see above)
 				 *        read 0=no MBE, or SBE occurred first
 				 *        write 1=Clear MBE status (must also
 				 *          clear SBE)
 				 *        write 0=NOP
 				 *
 				 * 1     SBE (R/WC)
 				 *        read 1=SBE at EAP (see above)
 				 *        read 0=no SBE, or MBE occurred first
 				 *        write 1=Clear SBE status (must also
 				 *          clear MBE)
 				 *        write 0=NOP
 				 */

 #define R82600_DRBA	0x60	/* + 0x60..0x63 SDRAM Row Boundry Address
 				 *  Registers
 				 *
 				 * 7:0  Address lines 30:24 - upper limit of
 				 * each row [p57]
 				 */

 struct r82600_error_info {
 	u32 eapr;
 };


 static unsigned int disable_hardware_scrub = 0;


 static void r82600_get_error_info (struct mem_ctl_info *mci,
 		struct r82600_error_info *info)
 {
 	pci_read_config_dword(mci->pdev, R82600_EAP, &info->eapr);

 	if (info->eapr & BIT(0))
 		/* Clear error to allow next error to be reported [p.62] */
 		pci_write_bits32(mci->pdev, R82600_EAP,
 				   ((u32) BIT(0) & (u32) BIT(1)),
 				   ((u32) BIT(0) & (u32) BIT(1)));

 	if (info->eapr & BIT(1))
 		/* Clear error to allow next error to be reported [p.62] */
 		pci_write_bits32(mci->pdev, R82600_EAP,
 				   ((u32) BIT(0) & (u32) BIT(1)),
 				   ((u32) BIT(0) & (u32) BIT(1)));
 }


 static int r82600_process_error_info (struct mem_ctl_info *mci,
 		struct r82600_error_info *info, int handle_errors)
 {
 	int error_found;
 	u32 eapaddr, page;
 	u32 syndrome;

 	error_found = 0;

 	/* bits 30:12 store the upper 19 bits of the 32 bit error address */
 	eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13;
 	/* Syndrome in bits 11:4 [p.62]       */
 	syndrome = (info->eapr >> 4) & 0xFF;

 	/* the R82600 reports at less than page *
 	 * granularity (upper 19 bits only)     */
 	page = eapaddr >> PAGE_SHIFT;

 	if (info->eapr & BIT(0)) { 	/* CE? */
 		error_found = 1;

 		if (handle_errors)
 			edac_mc_handle_ce(
 			    mci, page, 0,	/* not avail */
 			    syndrome,
 			    edac_mc_find_csrow_by_page(mci, page),
 			    0,	/* channel */
 			    mci->ctl_name);
 	}

 	if (info->eapr & BIT(1)) { 	/* UE? */
 		error_found = 1;

 		if (handle_errors)
 			/* 82600 doesn't give enough info */
 			edac_mc_handle_ue(mci, page, 0,
 			    edac_mc_find_csrow_by_page(mci, page),
 			    mci->ctl_name);
 	}

 	return error_found;
 }

 static void r82600_check(struct mem_ctl_info *mci)
 {
 	struct r82600_error_info info;

 	debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
 	r82600_get_error_info(mci, &info);
 	r82600_process_error_info(mci, &info, 1);
 }

 static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
 {
 	int rc = -ENODEV;
 	int index;
 	struct mem_ctl_info *mci = NULL;
 	u8 dramcr;
 	u32 ecc_on;
 	u32 reg_sdram;
 	u32 eapr;
 	u32 scrub_disabled;
 	u32 sdram_refresh_rate;
 	u32 row_high_limit_last = 0;
 	u32 eap_init_bits;

 	debugf0("MC: " __FILE__ ": %s()\n", __func__);


 	pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
 	pci_read_config_dword(pdev, R82600_EAP, &eapr);

 	ecc_on = dramcr & BIT(5);
 	reg_sdram = dramcr & BIT(4);
 	scrub_disabled = eapr & BIT(31);
 	sdram_refresh_rate = dramcr & (BIT(0) | BIT(1));

 	debugf2("MC: " __FILE__ ": %s(): sdram refresh rate = %#0x\n",
 		__func__, sdram_refresh_rate);

 	debugf2("MC: " __FILE__ ": %s(): DRAMC register = %#0x\n", __func__,
 		dramcr);

 	mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS);

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

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

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

 	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 	/* FIXME try to work out if the chip leads have been                 *
 	 * used for COM2 instead on this board? [MA6?]       MAYBE:          */

 	/* On the R82600, the pins for memory bits 72:65 - i.e. the   *
 	 * EC bits are shared with the pins for COM2 (!), so if COM2  *
 	 * is enabled, we assume COM2 is wired up, and thus no EDAC   *
 	 * is possible.                                               */
 	mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 	if (ecc_on) {
 		if (scrub_disabled)
 			debugf3("MC: " __FILE__ ": %s(): mci = %p - "
 				"Scrubbing disabled! EAP: %#0x\n", __func__,
 				mci, eapr);
 	} else
 		mci->edac_cap = EDAC_FLAG_NONE;

 	mci->mod_name = BS_MOD_STR;
 	mci->mod_ver = "$Revision: 1.1.2.6 $";
 	mci->ctl_name = "R82600";
 	mci->edac_check = r82600_check;
 	mci->ctl_page_to_phys = NULL;

 	for (index = 0; index < mci->nr_csrows; index++) {
 		struct csrow_info *csrow = &mci->csrows[index];
 		u8 drbar;	/* sDram Row Boundry Address Register */
 		u32 row_high_limit;
 		u32 row_base;

 		/* find the DRAM Chip Select Base address and mask */
 		pci_read_config_byte(mci->pdev, R82600_DRBA + index, &drbar);

 		debugf1("MC%d: " __FILE__ ": %s() Row=%d DRBA = %#0x\n",
 			mci->mc_idx, __func__, index, drbar);

 		row_high_limit = ((u32) drbar << 24);
 /*		row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */

 		debugf1("MC%d: " __FILE__ ": %s() Row=%d, "
 			"Boundry Address=%#0x, Last = %#0x \n",
 			mci->mc_idx, __func__, index, row_high_limit,
 			row_high_limit_last);

 		/* Empty row [p.57] */
 		if (row_high_limit == row_high_limit_last)
 			continue;

 		row_base = row_high_limit_last;

 		csrow->first_page = row_base >> PAGE_SHIFT;
 		csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
 		csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
 		/* Error address is top 19 bits - so granularity is      *
 		 * 14 bits                                               */
 		csrow->grain = 1 << 14;
 		csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
 		/* FIXME - check that this is unknowable with this chipset */
 		csrow->dtype = DEV_UNKNOWN;

 		/* Mode is global on 82600 */
 		csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
 		row_high_limit_last = row_high_limit;
 	}

 	/* clear counters */
 	/* FIXME should we? */

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

 	/* get this far and it's successful */

 	/* Clear error flags to allow next error to be reported [p.62] */
 	/* Test systems seem to always have the UE flag raised on boot */

 	eap_init_bits = BIT(0) & BIT(1);
 	if (disable_hardware_scrub) {
 		eap_init_bits |= BIT(31);
 		debugf3("MC: " __FILE__ ": %s(): Disabling Hardware Scrub "
 			"(scrub on error)\n", __func__);
 	}

 	pci_write_bits32(mci->pdev, R82600_EAP, eap_init_bits,
 			 eap_init_bits);

 	debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
 	return 0;

 fail:
 	if (mci)
 		edac_mc_free(mci);

 	return rc;
 }

 /* returns count (>= 0), or negative on error */
 static int __devinit r82600_init_one(struct pci_dev *pdev,
 				     const struct pci_device_id *ent)
 {
 	debugf0("MC: " __FILE__ ": %s()\n", __func__);

 	/* don't need to call pci_device_enable() */
 	return r82600_probe1(pdev, ent->driver_data);
 }


 static void __devexit r82600_remove_one(struct pci_dev *pdev)
 {
 	struct mem_ctl_info *mci;

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

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


 static const struct pci_device_id r82600_pci_tbl[] __devinitdata = {
 	{PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID)},
 	{0,}			/* 0 terminated list. */
 };

 MODULE_DEVICE_TABLE(pci, r82600_pci_tbl);


 static struct pci_driver r82600_driver = {
 	.name = BS_MOD_STR,
 	.probe = r82600_init_one,
 	.remove = __devexit_p(r82600_remove_one),
 	.id_table = r82600_pci_tbl,
 };


 int __init r82600_init(void)
 {
 	return pci_register_driver(&r82600_driver);
 }


 static void __exit r82600_exit(void)
 {
 	pci_unregister_driver(&r82600_driver);
 }


 module_init(r82600_init);
 module_exit(r82600_exit);


 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. "
 	      "on behalf of EADS Astrium");
 MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers");

 module_param(disable_hardware_scrub, bool, 0644);
 MODULE_PARM_DESC(disable_hardware_scrub,
 		 "If set, disable the chipset's automatic scrub for CEs");
	/*
	* Radisys 82600 Embedded chipset Memory Controller kernel module
	* (C) 2005 EADS Astrium
	* This file may be distributed under the terms of the
	* GNU General Public License.
	*
	* Written by Tim Small <tim@buttersideup.com>, based on work by Thayne
	* Harbaugh, Dan Hollis <goemon at anime dot net> and others.
	*
	* $Id: edac_r82600.c,v 1.1.2.6 2005/10/05 00:43:44 dsp_llnl Exp $
	*
	* Written with reference to 82600 High Integration Dual PCI System
	* Controller Data Book:
	* http://www.radisys.com/files/support_downloads/007-01277-0002.82600DataBook.pdf
	* references to this document given in []
	*/

	#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"

	/* Radisys say "The 82600 integrates a main memory SDRAM controller that
	* supports up to four banks of memory. The four banks can support a mix of
	* sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs,
	* each of which can be any size from 16MB to 512MB. Both registered (control
	* signals buffered) and unbuffered DIMM types are supported. Mixing of
	* registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs
	* is not allowed. The 82600 SDRAM interface operates at the same frequency as
	* the CPU bus, 66MHz, 100MHz or 133MHz."
	*/

	#define R82600_NR_CSROWS 4
	#define R82600_NR_CHANS 1
	#define R82600_NR_DIMMS 4

	#define R82600_BRIDGE_ID 0x8200

	/* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */
	#define R82600_DRAMC 0x57 /* Various SDRAM related control bits
	* all bits are R/W
	*
	* 7 SDRAM ISA Hole Enable
	* 6 Flash Page Mode Enable
	* 5 ECC Enable: 1=ECC 0=noECC
	* 4 DRAM DIMM Type: 1=
	* 3 BIOS Alias Disable
	* 2 SDRAM BIOS Flash Write Enable
	* 1:0 SDRAM Refresh Rate: 00=Disabled
	* 01=7.8usec (256Mbit SDRAMs)
	* 10=15.6us 11=125usec
	*/

	#define R82600_SDRAMC 0x76 /* "SDRAM Control Register"
	* More SDRAM related control bits
	* all bits are R/W
	*
	* 15:8 Reserved.
	*
	* 7:5 Special SDRAM Mode Select
	*
	* 4 Force ECC
	*
	* 1=Drive ECC bits to 0 during
	* write cycles (i.e. ECC test mode)
	*
	* 0=Normal ECC functioning
	*
	* 3 Enhanced Paging Enable
	*
	* 2 CAS# Latency 0=3clks 1=2clks
	*
	* 1 RAS# to CAS# Delay 0=3 1=2
	*
	* 0 RAS# Precharge 0=3 1=2
	*/

	#define R82600_EAP 0x80 /* ECC Error Address Pointer Register
	*
	* 31 Disable Hardware Scrubbing (RW)
	* 0=Scrub on corrected read
	* 1=Don't scrub on corrected read
	*
	* 30:12 Error Address Pointer (RO)
	* Upper 19 bits of error address
	*
	* 11:4 Syndrome Bits (RO)
	*
	* 3 BSERR# on multibit error (RW)
	* 1=enable 0=disable
	*
	* 2 NMI on Single Bit Eror (RW)
	* 1=NMI triggered by SBE n.b. other
	* prerequeists
	* 0=NMI not triggered
	*
	* 1 MBE (R/WC)
	* read 1=MBE at EAP (see above)
	* read 0=no MBE, or SBE occurred first
	* write 1=Clear MBE status (must also
	* clear SBE)
	* write 0=NOP
	*
	* 1 SBE (R/WC)
	* read 1=SBE at EAP (see above)
	* read 0=no SBE, or MBE occurred first
	* write 1=Clear SBE status (must also
	* clear MBE)
	* write 0=NOP
	*/

	#define R82600_DRBA 0x60 /* + 0x60..0x63 SDRAM Row Boundry Address
	* Registers
	*
	* 7:0 Address lines 30:24 - upper limit of
	* each row [p57]
	*/

	struct r82600_error_info {
	u32 eapr;
	};


	static unsigned int disable_hardware_scrub = 0;


	static void r82600_get_error_info (struct mem_ctl_info *mci,
	struct r82600_error_info *info)
	{
	pci_read_config_dword(mci->pdev, R82600_EAP, &info->eapr);

	if (info->eapr & BIT(0))
	/* Clear error to allow next error to be reported [p.62] */
	pci_write_bits32(mci->pdev, R82600_EAP,
	((u32) BIT(0) & (u32) BIT(1)),
	((u32) BIT(0) & (u32) BIT(1)));

	if (info->eapr & BIT(1))
	/* Clear error to allow next error to be reported [p.62] */
	pci_write_bits32(mci->pdev, R82600_EAP,
	((u32) BIT(0) & (u32) BIT(1)),
	((u32) BIT(0) & (u32) BIT(1)));
	}


	static int r82600_process_error_info (struct mem_ctl_info *mci,
	struct r82600_error_info *info, int handle_errors)
	{
	int error_found;
	u32 eapaddr, page;
	u32 syndrome;

	error_found = 0;

	/* bits 30:12 store the upper 19 bits of the 32 bit error address */
	eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13;
	/* Syndrome in bits 11:4 [p.62] */
	syndrome = (info->eapr >> 4) & 0xFF;

	/* the R82600 reports at less than page *
	* granularity (upper 19 bits only) */
	page = eapaddr >> PAGE_SHIFT;

	if (info->eapr & BIT(0)) { /* CE? */
	error_found = 1;

	if (handle_errors)
	edac_mc_handle_ce(
	mci, page, 0, /* not avail */
	syndrome,
	edac_mc_find_csrow_by_page(mci, page),
	0, /* channel */
	mci->ctl_name);
	}

	if (info->eapr & BIT(1)) { /* UE? */
	error_found = 1;

	if (handle_errors)
	/* 82600 doesn't give enough info */
	edac_mc_handle_ue(mci, page, 0,
	edac_mc_find_csrow_by_page(mci, page),
	mci->ctl_name);
	}

	return error_found;
	}

	static void r82600_check(struct mem_ctl_info *mci)
	{
	struct r82600_error_info info;

	debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
	r82600_get_error_info(mci, &info);
	r82600_process_error_info(mci, &info, 1);
	}

	static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
	{
	int rc = -ENODEV;
	int index;
	struct mem_ctl_info *mci = NULL;
	u8 dramcr;
	u32 ecc_on;
	u32 reg_sdram;
	u32 eapr;
	u32 scrub_disabled;
	u32 sdram_refresh_rate;
	u32 row_high_limit_last = 0;
	u32 eap_init_bits;

	debugf0("MC: " __FILE__ ": %s()\n", __func__);


	pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
	pci_read_config_dword(pdev, R82600_EAP, &eapr);

	ecc_on = dramcr & BIT(5);
	reg_sdram = dramcr & BIT(4);
	scrub_disabled = eapr & BIT(31);
	sdram_refresh_rate = dramcr & (BIT(0) \| BIT(1));

	debugf2("MC: " __FILE__ ": %s(): sdram refresh rate = %#0x\n",
	__func__, sdram_refresh_rate);

	debugf2("MC: " __FILE__ ": %s(): DRAMC register = %#0x\n", __func__,
	dramcr);

	mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS);

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

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

	mci->pdev = pdev;
	mci->mtype_cap = MEM_FLAG_RDDR \| MEM_FLAG_DDR;

	mci->edac_ctl_cap = EDAC_FLAG_NONE \| EDAC_FLAG_EC \| EDAC_FLAG_SECDED;
	/* FIXME try to work out if the chip leads have been *
	* used for COM2 instead on this board? [MA6?] MAYBE: */

	/* On the R82600, the pins for memory bits 72:65 - i.e. the *
	* EC bits are shared with the pins for COM2 (!), so if COM2 *
	* is enabled, we assume COM2 is wired up, and thus no EDAC *
	* is possible. */
	mci->edac_cap = EDAC_FLAG_NONE \| EDAC_FLAG_EC \| EDAC_FLAG_SECDED;
	if (ecc_on) {
	if (scrub_disabled)
	debugf3("MC: " __FILE__ ": %s(): mci = %p - "
	"Scrubbing disabled! EAP: %#0x\n", __func__,
	mci, eapr);
	} else
	mci->edac_cap = EDAC_FLAG_NONE;

	mci->mod_name = BS_MOD_STR;
	mci->mod_ver = "$Revision: 1.1.2.6 $";
	mci->ctl_name = "R82600";
	mci->edac_check = r82600_check;
	mci->ctl_page_to_phys = NULL;

	for (index = 0; index < mci->nr_csrows; index++) {
	struct csrow_info *csrow = &mci->csrows[index];
	u8 drbar; /* sDram Row Boundry Address Register */
	u32 row_high_limit;
	u32 row_base;

	/* find the DRAM Chip Select Base address and mask */
	pci_read_config_byte(mci->pdev, R82600_DRBA + index, &drbar);

	debugf1("MC%d: " __FILE__ ": %s() Row=%d DRBA = %#0x\n",
	mci->mc_idx, __func__, index, drbar);

	row_high_limit = ((u32) drbar << 24);
	/* row_high_limit = ((u32)drbar << 24) \| 0xffffffUL; */

	debugf1("MC%d: " __FILE__ ": %s() Row=%d, "
	"Boundry Address=%#0x, Last = %#0x \n",
	mci->mc_idx, __func__, index, row_high_limit,
	row_high_limit_last);

	/* Empty row [p.57] */
	if (row_high_limit == row_high_limit_last)
	continue;

	row_base = row_high_limit_last;

	csrow->first_page = row_base >> PAGE_SHIFT;
	csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
	csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
	/* Error address is top 19 bits - so granularity is *
	* 14 bits */
	csrow->grain = 1 << 14;
	csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
	/* FIXME - check that this is unknowable with this chipset */
	csrow->dtype = DEV_UNKNOWN;

	/* Mode is global on 82600 */
	csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
	row_high_limit_last = row_high_limit;
	}

	/* clear counters */
	/* FIXME should we? */

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

	/* get this far and it's successful */

	/* Clear error flags to allow next error to be reported [p.62] */
	/* Test systems seem to always have the UE flag raised on boot */

	eap_init_bits = BIT(0) & BIT(1);
	if (disable_hardware_scrub) {
	eap_init_bits \|= BIT(31);
	debugf3("MC: " __FILE__ ": %s(): Disabling Hardware Scrub "
	"(scrub on error)\n", __func__);
	}

	pci_write_bits32(mci->pdev, R82600_EAP, eap_init_bits,
	eap_init_bits);

	debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
	return 0;

	fail:
	if (mci)
	edac_mc_free(mci);

	return rc;
	}

	/* returns count (>= 0), or negative on error */
	static int __devinit r82600_init_one(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	debugf0("MC: " __FILE__ ": %s()\n", __func__);

	/* don't need to call pci_device_enable() */
	return r82600_probe1(pdev, ent->driver_data);
	}


	static void __devexit r82600_remove_one(struct pci_dev *pdev)
	{
	struct mem_ctl_info *mci;

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

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


	static const struct pci_device_id r82600_pci_tbl[] __devinitdata = {
	{PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID)},
	{0,} /* 0 terminated list. */
	};

	MODULE_DEVICE_TABLE(pci, r82600_pci_tbl);


	static struct pci_driver r82600_driver = {
	.name = BS_MOD_STR,
	.probe = r82600_init_one,
	.remove = __devexit_p(r82600_remove_one),
	.id_table = r82600_pci_tbl,
	};


	int __init r82600_init(void)
	{
	return pci_register_driver(&r82600_driver);
	}


	static void __exit r82600_exit(void)
	{
	pci_unregister_driver(&r82600_driver);
	}


	module_init(r82600_init);
	module_exit(r82600_exit);


	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. "
	"on behalf of EADS Astrium");
	MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers");

	module_param(disable_hardware_scrub, bool, 0644);
	MODULE_PARM_DESC(disable_hardware_scrub,
	"If set, disable the chipset's automatic scrub for CEs");