[mirror_ubuntu-zesty-kernel.git] / drivers / edac / i82975x_edac.c

/*
 * Intel 82975X Memory Controller kernel module
 * (C) 2007 aCarLab (India) Pvt. Ltd. (http://acarlab.com)
 * (C) 2007 jetzbroadband (http://jetzbroadband.com)
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written by Arvind R.
 *   Copied from i82875p_edac.c source:
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/edac.h>
#include "edac_core.h"

#define I82975X_REVISION	" Ver: 1.0.0"
#define EDAC_MOD_STR		"i82975x_edac"

#define i82975x_printk(level, fmt, arg...) \
	edac_printk(level, "i82975x", fmt, ##arg)

#define i82975x_mc_printk(mci, level, fmt, arg...) \
	edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg)

#ifndef PCI_DEVICE_ID_INTEL_82975_0
#define PCI_DEVICE_ID_INTEL_82975_0	0x277c
#endif				/* PCI_DEVICE_ID_INTEL_82975_0 */

#define I82975X_NR_CSROWS(nr_chans)		(8/(nr_chans))

/* Intel 82975X register addresses - device 0 function 0 - DRAM Controller */
#define I82975X_EAP		0x58	/* Dram Error Address Pointer (32b)
					 *
					 * 31:7  128 byte cache-line address
					 * 6:1   reserved
					 * 0     0: CH0; 1: CH1
					 */

#define I82975X_DERRSYN		0x5c	/* Dram Error SYNdrome (8b)
					 *
					 *  7:0  DRAM ECC Syndrome
					 */

#define I82975X_DES		0x5d	/* Dram ERRor DeSTination (8b)
					 * 0h:    Processor Memory Reads
					 * 1h:7h  reserved
					 * More - See Page 65 of Intel DocSheet.
					 */

#define I82975X_ERRSTS		0xc8	/* Error Status Register (16b)
					 *
					 * 15:12 reserved
					 * 11    Thermal Sensor Event
					 * 10    reserved
					 *  9    non-DRAM lock error (ndlock)
					 *  8    Refresh Timeout
					 *  7:2  reserved
					 *  1    ECC UE (multibit DRAM error)
					 *  0    ECC CE (singlebit DRAM error)
					 */

/* Error Reporting is supported by 3 mechanisms:
  1. DMI SERR generation  ( ERRCMD )
  2. SMI DMI  generation  ( SMICMD )
  3. SCI DMI  generation  ( SCICMD )
NOTE: Only ONE of the three must be enabled
*/
#define I82975X_ERRCMD		0xca	/* Error Command (16b)
					 *
					 * 15:12 reserved
					 * 11    Thermal Sensor Event
					 * 10    reserved
					 *  9    non-DRAM lock error (ndlock)
					 *  8    Refresh Timeout
					 *  7:2  reserved
					 *  1    ECC UE (multibit DRAM error)
					 *  0    ECC CE (singlebit DRAM error)
					 */

#define I82975X_SMICMD		0xcc	/* Error Command (16b)
					 *
					 * 15:2  reserved
					 *  1    ECC UE (multibit DRAM error)
					 *  0    ECC CE (singlebit DRAM error)
					 */

#define I82975X_SCICMD		0xce	/* Error Command (16b)
					 *
					 * 15:2  reserved
					 *  1    ECC UE (multibit DRAM error)
					 *  0    ECC CE (singlebit DRAM error)
					 */

#define I82975X_XEAP	0xfc	/* Extended Dram Error Address Pointer (8b)
					 *
					 * 7:1   reserved
					 * 0     Bit32 of the Dram Error Address
					 */

#define I82975X_MCHBAR		0x44	/*
					 *
					 * 31:14 Base Addr of 16K memory-mapped
					 *	configuration space
					 * 13:1  reserverd
					 *  0    mem-mapped config space enable
					 */

/* NOTE: Following addresses have to indexed using MCHBAR offset (44h, 32b) */
/* Intel 82975x memory mapped register space */

#define I82975X_DRB_SHIFT 25	/* fixed 32MiB grain */

#define I82975X_DRB		0x100	/* DRAM Row Boundary (8b x 8)
					 *
					 * 7   set to 1 in highest DRB of
					 *	channel if 4GB in ch.
					 * 6:2 upper boundary of rank in
					 *	32MB grains
					 * 1:0 set to 0
					 */
#define I82975X_DRB_CH0R0		0x100
#define I82975X_DRB_CH0R1		0x101
#define I82975X_DRB_CH0R2		0x102
#define I82975X_DRB_CH0R3		0x103
#define I82975X_DRB_CH1R0		0x180
#define I82975X_DRB_CH1R1		0x181
#define I82975X_DRB_CH1R2		0x182
#define I82975X_DRB_CH1R3		0x183


#define I82975X_DRA		0x108	/* DRAM Row Attribute (4b x 8)
					 *  defines the PAGE SIZE to be used
					 *	for the rank
					 *  7    reserved
					 *  6:4  row attr of odd rank, i.e. 1
					 *  3    reserved
					 *  2:0  row attr of even rank, i.e. 0
					 *
					 * 000 = unpopulated
					 * 001 = reserved
					 * 010 = 4KiB
					 * 011 = 8KiB
					 * 100 = 16KiB
					 * others = reserved
					 */
#define I82975X_DRA_CH0R01		0x108
#define I82975X_DRA_CH0R23		0x109
#define I82975X_DRA_CH1R01		0x188
#define I82975X_DRA_CH1R23		0x189


#define I82975X_BNKARC	0x10e /* Type of device in each rank - Bank Arch (16b)
					 *
					 * 15:8  reserved
					 * 7:6  Rank 3 architecture
					 * 5:4  Rank 2 architecture
					 * 3:2  Rank 1 architecture
					 * 1:0  Rank 0 architecture
					 *
					 * 00 => 4 banks
					 * 01 => 8 banks
					 */
#define I82975X_C0BNKARC	0x10e
#define I82975X_C1BNKARC	0x18e


#define I82975X_DRC		0x120 /* DRAM Controller Mode0 (32b)
					 *
					 * 31:30 reserved
					 * 29    init complete
					 * 28:11 reserved, according to Intel
					 *    22:21 number of channels
					 *		00=1 01=2 in 82875
					 *		seems to be ECC mode
					 *		bits in 82975 in Asus
					 *		P5W
					 *	 19:18 Data Integ Mode
					 *		00=none 01=ECC in 82875
					 * 10:8  refresh mode
					 *  7    reserved
					 *  6:4  mode select
					 *  3:2  reserved
					 *  1:0  DRAM type 10=Second Revision
					 *		DDR2 SDRAM
					 *         00, 01, 11 reserved
					 */
#define I82975X_DRC_CH0M0		0x120
#define I82975X_DRC_CH1M0		0x1A0


#define I82975X_DRC_M1	0x124 /* DRAM Controller Mode1 (32b)
					 * 31	0=Standard Address Map
					 *	1=Enhanced Address Map
					 * 30:0	reserved
					 */

#define I82975X_DRC_CH0M1		0x124
#define I82975X_DRC_CH1M1		0x1A4

enum i82975x_chips {
	I82975X = 0,
};

struct i82975x_pvt {
	void __iomem *mch_window;
};

struct i82975x_dev_info {
	const char *ctl_name;
};

struct i82975x_error_info {
	u16 errsts;
	u32 eap;
	u8 des;
	u8 derrsyn;
	u16 errsts2;
	u8 chan;		/* the channel is bit 0 of EAP */
	u8 xeap;		/* extended eap bit */
};

static const struct i82975x_dev_info i82975x_devs[] = {
	[I82975X] = {
		.ctl_name = "i82975x"
	},
};

static struct pci_dev *mci_pdev;	/* init dev: in case that AGP code has
					 * already registered driver
					 */

static int i82975x_registered = 1;

static void i82975x_get_error_info(struct mem_ctl_info *mci,
		struct i82975x_error_info *info)
{
	struct pci_dev *pdev;

	pdev = to_pci_dev(mci->dev);

	/*
	 * This is a mess because there is no atomic way to read all the
	 * registers at once and the registers can transition from CE being
	 * overwritten by UE.
	 */
	pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts);
	pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
	pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
	pci_read_config_byte(pdev, I82975X_DES, &info->des);
	pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn);
	pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2);

	pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003);

	/*
	 * If the error is the same then we can for both reads then
	 * the first set of reads is valid.  If there is a change then
	 * there is a CE no info and the second set of reads is valid
	 * and should be UE info.
	 */
	if (!(info->errsts2 & 0x0003))
		return;

	if ((info->errsts ^ info->errsts2) & 0x0003) {
		pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
		pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
		pci_read_config_byte(pdev, I82975X_DES, &info->des);
		pci_read_config_byte(pdev, I82975X_DERRSYN,
				&info->derrsyn);
	}
}

static int i82975x_process_error_info(struct mem_ctl_info *mci,
		struct i82975x_error_info *info, int handle_errors)
{
	int row, chan;
	unsigned long offst, page;

	if (!(info->errsts2 & 0x0003))
		return 0;

	if (!handle_errors)
		return 1;

	if ((info->errsts ^ info->errsts2) & 0x0003) {
		edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
		info->errsts = info->errsts2;
	}

	page = (unsigned long) info->eap;
	page >>= 1;
	if (info->xeap & 1)
		page |= 0x80000000;
	page >>= (PAGE_SHIFT - 1);
	row = edac_mc_find_csrow_by_page(mci, page);

	if (row == -1)	{
		i82975x_mc_printk(mci, KERN_ERR, "error processing EAP:\n"
			"\tXEAP=%u\n"
			"\t EAP=0x%08x\n"
			"\tPAGE=0x%08x\n",
			(info->xeap & 1) ? 1 : 0, info->eap, (unsigned int) page);
		return 0;
	}
	chan = (mci->csrows[row].nr_channels == 1) ? 0 : info->eap & 1;
	offst = info->eap
			& ((1 << PAGE_SHIFT) -
			   (1 << mci->csrows[row].channels[chan].dimm->grain));

	if (info->errsts & 0x0002)
		edac_mc_handle_ue(mci, page, offst , row, "i82975x UE");
	else
		edac_mc_handle_ce(mci, page, offst, info->derrsyn, row,
				chan, "i82975x CE");

	return 1;
}

static void i82975x_check(struct mem_ctl_info *mci)
{
	struct i82975x_error_info info;

	debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
	i82975x_get_error_info(mci, &info);
	i82975x_process_error_info(mci, &info, 1);
}

/* Return 1 if dual channel mode is active.  Else return 0. */
static int dual_channel_active(void __iomem *mch_window)
{
	/*
	 * We treat interleaved-symmetric configuration as dual-channel - EAP's
	 * bit-0 giving the channel of the error location.
	 *
	 * All other configurations are treated as single channel - the EAP's
	 * bit-0 will resolve ok in symmetric area of mixed
	 * (symmetric/asymmetric) configurations
	 */
	u8	drb[4][2];
	int	row;
	int    dualch;

	for (dualch = 1, row = 0; dualch && (row < 4); row++) {
		drb[row][0] = readb(mch_window + I82975X_DRB + row);
		drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
		dualch = dualch && (drb[row][0] == drb[row][1]);
	}
	return dualch;
}

static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
{
	/*
	 * ECC is possible on i92975x ONLY with DEV_X8
	 */
	return DEV_X8;
}

static void i82975x_init_csrows(struct mem_ctl_info *mci,
		struct pci_dev *pdev, void __iomem *mch_window)
{
	static const char *labels[4] = {
							"DIMM A1", "DIMM A2",
							"DIMM B1", "DIMM B2"
						};
	struct csrow_info *csrow;
	unsigned long last_cumul_size;
	u8 value;
	u32 cumul_size, nr_pages;
	int index, chan;
	struct dimm_info *dimm;
	enum dev_type dtype;

	last_cumul_size = 0;

	/*
	 * 82875 comment:
	 * The dram row boundary (DRB) reg values are boundary address
	 * for each DRAM row with a granularity of 32 or 64MB (single/dual
	 * channel operation).  DRB regs are cumulative; therefore DRB7 will
	 * contain the total memory contained in all rows.
	 *
	 */

	for (index = 0; index < mci->nr_csrows; index++) {
		csrow = &mci->csrows[index];

		value = readb(mch_window + I82975X_DRB + index +
					((index >= 4) ? 0x80 : 0));
		cumul_size = value;
		cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
		/*
		 * Adjust cumul_size w.r.t number of channels
		 *
		 */
		if (csrow->nr_channels > 1)
			cumul_size <<= 1;
		debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
			cumul_size);

		nr_pages = cumul_size - last_cumul_size;
		/*
		 * Initialise dram labels
		 * index values:
		 *   [0-7] for single-channel; i.e. csrow->nr_channels = 1
		 *   [0-3] for dual-channel; i.e. csrow->nr_channels = 2
		 */
		dtype = i82975x_dram_type(mch_window, index);
		for (chan = 0; chan < csrow->nr_channels; chan++) {
			dimm = mci->csrows[index].channels[chan].dimm;

			if (!nr_pages)
				continue;

			dimm->nr_pages = nr_pages / csrow->nr_channels;
			strncpy(csrow->channels[chan].dimm->label,
					labels[(index >> 1) + (chan * 2)],
					EDAC_MC_LABEL_LEN);
			dimm->grain = 1 << 7;	/* 128Byte cache-line resolution */
			dimm->dtype = i82975x_dram_type(mch_window, index);
			dimm->mtype = MEM_DDR2; /* I82975x supports only DDR2 */
			dimm->edac_mode = EDAC_SECDED; /* only supported */
		}

		if (!nr_pages)
			continue;	/* not populated */

		csrow->first_page = last_cumul_size;
		csrow->last_page = cumul_size - 1;
		last_cumul_size = cumul_size;
	}
}

/* #define  i82975x_DEBUG_IOMEM */

#ifdef i82975x_DEBUG_IOMEM
static void i82975x_print_dram_timings(void __iomem *mch_window)
{
	/*
	 * The register meanings are from Intel specs;
	 * (shows 13-5-5-5 for 800-DDR2)
	 * Asus P5W Bios reports 15-5-4-4
	 * What's your religion?
	 */
	static const int caslats[4] = { 5, 4, 3, 6 };
	u32	dtreg[2];

	dtreg[0] = readl(mch_window + 0x114);
	dtreg[1] = readl(mch_window + 0x194);
	i82975x_printk(KERN_INFO, "DRAM Timings :     Ch0    Ch1\n"
		"                RAS Active Min = %d     %d\n"
		"                CAS latency    =  %d      %d\n"
		"                RAS to CAS     =  %d      %d\n"
		"                RAS precharge  =  %d      %d\n",
		(dtreg[0] >> 19 ) & 0x0f,
			(dtreg[1] >> 19) & 0x0f,
		caslats[(dtreg[0] >> 8) & 0x03],
			caslats[(dtreg[1] >> 8) & 0x03],
		((dtreg[0] >> 4) & 0x07) + 2,
			((dtreg[1] >> 4) & 0x07) + 2,
		(dtreg[0] & 0x07) + 2,
			(dtreg[1] & 0x07) + 2
	);

}
#endif

static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
{
	int rc = -ENODEV;
	struct mem_ctl_info *mci;
	struct i82975x_pvt *pvt;
	void __iomem *mch_window;
	u32 mchbar;
	u32 drc[2];
	struct i82975x_error_info discard;
	int	chans;
#ifdef i82975x_DEBUG_IOMEM
	u8 c0drb[4];
	u8 c1drb[4];
#endif

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

	pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
	if (!(mchbar & 1)) {
		debugf3("%s(): failed, MCHBAR disabled!\n", __func__);
		goto fail0;
	}
	mchbar &= 0xffffc000;	/* bits 31:14 used for 16K window */
	mch_window = ioremap_nocache(mchbar, 0x1000);

#ifdef i82975x_DEBUG_IOMEM
	i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
					mchbar, mch_window);

	c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
	c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
	c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
	c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
	c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
	c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
	c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
	c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
	i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
	i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
	i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
	i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
	i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
	i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
	i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
	i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
#endif

	drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
	drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
#ifdef i82975x_DEBUG_IOMEM
	i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
			((drc[0] >> 21) & 3) == 1 ?
				"ECC enabled" : "ECC disabled");
	i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
			((drc[1] >> 21) & 3) == 1 ?
				"ECC enabled" : "ECC disabled");

	i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
		readw(mch_window + I82975X_C0BNKARC));
	i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
		readw(mch_window + I82975X_C1BNKARC));
	i82975x_print_dram_timings(mch_window);
	goto fail1;
#endif
	if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) {
		i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
		goto fail1;
	}

	chans = dual_channel_active(mch_window) + 1;

	/* assuming only one controller, index thus is 0 */
	mci = edac_mc_alloc(sizeof(*pvt), I82975X_NR_CSROWS(chans),
					chans, 0);
	if (!mci) {
		rc = -ENOMEM;
		goto fail1;
	}

	debugf3("%s(): init mci\n", __func__);
	mci->dev = &pdev->dev;
	mci->mtype_cap = MEM_FLAG_DDR2;
	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
	mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = I82975X_REVISION;
	mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
	mci->dev_name = pci_name(pdev);
	mci->edac_check = i82975x_check;
	mci->ctl_page_to_phys = NULL;
	debugf3("%s(): init pvt\n", __func__);
	pvt = (struct i82975x_pvt *) mci->pvt_info;
	pvt->mch_window = mch_window;
	i82975x_init_csrows(mci, pdev, mch_window);
	mci->scrub_mode = SCRUB_HW_SRC;
	i82975x_get_error_info(mci, &discard);  /* clear counters */

	/* finalize this instance of memory controller with edac core */
	if (edac_mc_add_mc(mci)) {
		debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
		goto fail2;
	}

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

fail2:
	edac_mc_free(mci);

fail1:
	iounmap(mch_window);
fail0:
	return rc;
}

/* returns count (>= 0), or negative on error */
static int __devinit i82975x_init_one(struct pci_dev *pdev,
		const struct pci_device_id *ent)
{
	int rc;

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

	if (pci_enable_device(pdev) < 0)
		return -EIO;

	rc = i82975x_probe1(pdev, ent->driver_data);

	if (mci_pdev == NULL)
		mci_pdev = pci_dev_get(pdev);

	return rc;
}

static void __devexit i82975x_remove_one(struct pci_dev *pdev)
{
	struct mem_ctl_info *mci;
	struct i82975x_pvt *pvt;

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

	mci = edac_mc_del_mc(&pdev->dev);
	if (mci  == NULL)
		return;

	pvt = mci->pvt_info;
	if (pvt->mch_window)
		iounmap( pvt->mch_window );

	edac_mc_free(mci);
}

static DEFINE_PCI_DEVICE_TABLE(i82975x_pci_tbl) = {
	{
		PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		I82975X
	},
	{
		0,
	}	/* 0 terminated list. */
};

MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);

static struct pci_driver i82975x_driver = {
	.name = EDAC_MOD_STR,
	.probe = i82975x_init_one,
	.remove = __devexit_p(i82975x_remove_one),
	.id_table = i82975x_pci_tbl,
};

static int __init i82975x_init(void)
{
	int pci_rc;

	debugf3("%s()\n", __func__);

       /* Ensure that the OPSTATE is set correctly for POLL or NMI */
       opstate_init();

	pci_rc = pci_register_driver(&i82975x_driver);
	if (pci_rc < 0)
		goto fail0;

	if (mci_pdev == NULL) {
		mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
				PCI_DEVICE_ID_INTEL_82975_0, NULL);

		if (!mci_pdev) {
			debugf0("i82975x pci_get_device fail\n");
			pci_rc = -ENODEV;
			goto fail1;
		}

		pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);

		if (pci_rc < 0) {
			debugf0("i82975x init fail\n");
			pci_rc = -ENODEV;
			goto fail1;
		}
	}

	return 0;

fail1:
	pci_unregister_driver(&i82975x_driver);

fail0:
	if (mci_pdev != NULL)
		pci_dev_put(mci_pdev);

	return pci_rc;
}

static void __exit i82975x_exit(void)
{
	debugf3("%s()\n", __func__);

	pci_unregister_driver(&i82975x_driver);

	if (!i82975x_registered) {
		i82975x_remove_one(mci_pdev);
		pci_dev_put(mci_pdev);
	}
}

module_init(i82975x_init);
module_exit(i82975x_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arvind R. <arvino55@gmail.com>");
MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");

module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
Commit	Line	Data
420390f0 RD	1	/*
	2	* Intel 82975X Memory Controller kernel module
	3	* (C) 2007 aCarLab (India) Pvt. Ltd. (http://acarlab.com)
	4	* (C) 2007 jetzbroadband (http://jetzbroadband.com)
	5	* This file may be distributed under the terms of the
	6	* GNU General Public License.
	7	*
	8	* Written by Arvind R.
	9	* Copied from i82875p_edac.c source:
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/pci.h>
	15	#include <linux/pci_ids.h>
c3c52bce	16	#include <linux/edac.h>
420390f0 RD	17	#include "edac_core.h"
420390f0 RD	18
152ba394	19	#define I82975X_REVISION " Ver: 1.0.0"
420390f0 RD	20	#define EDAC_MOD_STR "i82975x_edac"
	21
	22	#define i82975x_printk(level, fmt, arg...) \
	23	edac_printk(level, "i82975x", fmt, ##arg)
	24
	25	#define i82975x_mc_printk(mci, level, fmt, arg...) \
	26	edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg)
	27
	28	#ifndef PCI_DEVICE_ID_INTEL_82975_0
	29	#define PCI_DEVICE_ID_INTEL_82975_0 0x277c
	30	#endif /* PCI_DEVICE_ID_INTEL_82975_0 */
	31
	32	#define I82975X_NR_CSROWS(nr_chans) (8/(nr_chans))
	33
	34	/* Intel 82975X register addresses - device 0 function 0 - DRAM Controller */
	35	#define I82975X_EAP 0x58 /* Dram Error Address Pointer (32b)
	36	*
	37	* 31:7 128 byte cache-line address
	38	* 6:1 reserved
	39	* 0 0: CH0; 1: CH1
	40	*/
	41
	42	#define I82975X_DERRSYN 0x5c /* Dram Error SYNdrome (8b)
	43	*
	44	* 7:0 DRAM ECC Syndrome
	45	*/
	46
	47	#define I82975X_DES 0x5d /* Dram ERRor DeSTination (8b)
	48	* 0h: Processor Memory Reads
	49	* 1h:7h reserved
	50	* More - See Page 65 of Intel DocSheet.
	51	*/
	52
	53	#define I82975X_ERRSTS 0xc8 /* Error Status Register (16b)
	54	*
	55	* 15:12 reserved
	56	* 11 Thermal Sensor Event
	57	* 10 reserved
	58	* 9 non-DRAM lock error (ndlock)
	59	* 8 Refresh Timeout
	60	* 7:2 reserved
	61	* 1 ECC UE (multibit DRAM error)
	62	* 0 ECC CE (singlebit DRAM error)
	63	*/
	64
	65	/* Error Reporting is supported by 3 mechanisms:
	66	1. DMI SERR generation ( ERRCMD )
	67	2. SMI DMI generation ( SMICMD )
	68	3. SCI DMI generation ( SCICMD )
	69	NOTE: Only ONE of the three must be enabled
	70	*/
	71	#define I82975X_ERRCMD 0xca /* Error Command (16b)
	72	*
	73	* 15:12 reserved
	74	* 11 Thermal Sensor Event
	75	* 10 reserved
	76	* 9 non-DRAM lock error (ndlock)
	77	* 8 Refresh Timeout
	78	* 7:2 reserved
	79	* 1 ECC UE (multibit DRAM error)
	80	* 0 ECC CE (singlebit DRAM error)
	81	*/
	82
	83	#define I82975X_SMICMD 0xcc /* Error Command (16b)
84	*
85	* 15:2 reserved
86	* 1 ECC UE (multibit DRAM error)
87	* 0 ECC CE (singlebit DRAM error)
88	*/
89
90	#define I82975X_SCICMD 0xce /* Error Command (16b)
91	*
92	* 15:2 reserved
93	* 1 ECC UE (multibit DRAM error)
94	* 0 ECC CE (singlebit DRAM error)
95	*/
96
97	#define I82975X_XEAP 0xfc /* Extended Dram Error Address Pointer (8b)
98	*
99	* 7:1 reserved
100	* 0 Bit32 of the Dram Error Address
101	*/
102
103	#define I82975X_MCHBAR 0x44 /*
104	*
105	* 31:14 Base Addr of 16K memory-mapped
106	* configuration space
107	* 13:1 reserverd
108	* 0 mem-mapped config space enable
109	*/
110
111	/* NOTE: Following addresses have to indexed using MCHBAR offset (44h, 32b) */
112	/* Intel 82975x memory mapped register space */
113
114	#define I82975X_DRB_SHIFT 25 /* fixed 32MiB grain */
115
116	#define I82975X_DRB 0x100 /* DRAM Row Boundary (8b x 8)
117	*
118	* 7 set to 1 in highest DRB of
119	* channel if 4GB in ch.
120	* 6:2 upper boundary of rank in
121	* 32MB grains
122	* 1:0 set to 0
123	*/
124	#define I82975X_DRB_CH0R0 0x100
125	#define I82975X_DRB_CH0R1 0x101
126	#define I82975X_DRB_CH0R2 0x102
127	#define I82975X_DRB_CH0R3 0x103
128	#define I82975X_DRB_CH1R0 0x180
129	#define I82975X_DRB_CH1R1 0x181
130	#define I82975X_DRB_CH1R2 0x182
131	#define I82975X_DRB_CH1R3 0x183
132
133
134	#define I82975X_DRA 0x108 /* DRAM Row Attribute (4b x 8)
135	* defines the PAGE SIZE to be used
136	* for the rank
137	* 7 reserved
138	* 6:4 row attr of odd rank, i.e. 1
139	* 3 reserved
140	* 2:0 row attr of even rank, i.e. 0
141	*
142	* 000 = unpopulated
143	* 001 = reserved
144	* 010 = 4KiB
145	* 011 = 8KiB
146	* 100 = 16KiB
147	* others = reserved
148	*/
149	#define I82975X_DRA_CH0R01 0x108
150	#define I82975X_DRA_CH0R23 0x109
151	#define I82975X_DRA_CH1R01 0x188
152	#define I82975X_DRA_CH1R23 0x189
153
154
155	#define I82975X_BNKARC 0x10e /* Type of device in each rank - Bank Arch (16b)
156	*
157	* 15:8 reserved
158	* 7:6 Rank 3 architecture
159	* 5:4 Rank 2 architecture
160	* 3:2 Rank 1 architecture
161	* 1:0 Rank 0 architecture
162	*
7ba99575 A	163	* 00 => 4 banks
7ba99575 A	164	* 01 => 8 banks
420390f0 RD	165	*/
	166	#define I82975X_C0BNKARC 0x10e
	167	#define I82975X_C1BNKARC 0x18e
	168
	169
	170
	171	#define I82975X_DRC 0x120 /* DRAM Controller Mode0 (32b)
	172	*
	173	* 31:30 reserved
	174	* 29 init complete
	175	* 28:11 reserved, according to Intel
	176	* 22:21 number of channels
	177	* 00=1 01=2 in 82875
	178	* seems to be ECC mode
	179	* bits in 82975 in Asus
	180	* P5W
	181	* 19:18 Data Integ Mode
	182	* 00=none 01=ECC in 82875
	183	* 10:8 refresh mode
	184	* 7 reserved
	185	* 6:4 mode select
	186	* 3:2 reserved
	187	* 1:0 DRAM type 10=Second Revision
	188	* DDR2 SDRAM
	189	* 00, 01, 11 reserved
	190	*/
	191	#define I82975X_DRC_CH0M0 0x120
	192	#define I82975X_DRC_CH1M0 0x1A0
	193
	194
	195	#define I82975X_DRC_M1 0x124 /* DRAM Controller Mode1 (32b)
	196	* 31 0=Standard Address Map
	197	* 1=Enhanced Address Map
	198	* 30:0 reserved
	199	*/
	200
	201	#define I82975X_DRC_CH0M1 0x124
	202	#define I82975X_DRC_CH1M1 0x1A4
	203
	204	enum i82975x_chips {
	205	I82975X = 0,
	206	};
	207
	208	struct i82975x_pvt {
	209	void __iomem *mch_window;
	210	};
	211
	212	struct i82975x_dev_info {
	213	const char *ctl_name;
	214	};
	215
	216	struct i82975x_error_info {
	217	u16 errsts;
	218	u32 eap;
	219	u8 des;
	220	u8 derrsyn;
	221	u16 errsts2;
	222	u8 chan; /* the channel is bit 0 of EAP */
	223	u8 xeap; /* extended eap bit */
	224	};
	225
	226	static const struct i82975x_dev_info i82975x_devs[] = {
	227	[I82975X] = {
	228	.ctl_name = "i82975x"
229	},
230	};
231
232	static struct pci_dev mci_pdev; / init dev: in case that AGP code has
233	* already registered driver
234	*/
235
236	static int i82975x_registered = 1;
237
238	static void i82975x_get_error_info(struct mem_ctl_info *mci,
239	struct i82975x_error_info *info)
240	{
241	struct pci_dev *pdev;
242
243	pdev = to_pci_dev(mci->dev);
244
245	/*
246	* This is a mess because there is no atomic way to read all the
247	* registers at once and the registers can transition from CE being
248	* overwritten by UE.
249	*/
250	pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts);
251	pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
252	pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
253	pci_read_config_byte(pdev, I82975X_DES, &info->des);
254	pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn);
255	pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2);
256
257	pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003);
258
259	/*
260	* If the error is the same then we can for both reads then
261	* the first set of reads is valid. If there is a change then
262	* there is a CE no info and the second set of reads is valid
263	* and should be UE info.
264	*/
265	if (!(info->errsts2 & 0x0003))
266	return;
267
268	if ((info->errsts ^ info->errsts2) & 0x0003) {
269	pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
270	pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
271	pci_read_config_byte(pdev, I82975X_DES, &info->des);
272	pci_read_config_byte(pdev, I82975X_DERRSYN,
273	&info->derrsyn);
274	}
275	}
276
277	static int i82975x_process_error_info(struct mem_ctl_info *mci,
278	struct i82975x_error_info *info, int handle_errors)
279	{
6099e419	280	int row, chan;
cb60a422	281	unsigned long offst, page;
420390f0	282
420390f0 RD	283	if (!(info->errsts2 & 0x0003))
	284	return 0;
	285
	286	if (!handle_errors)
	287	return 1;
	288
	289	if ((info->errsts ^ info->errsts2) & 0x0003) {
	290	edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
	291	info->errsts = info->errsts2;
	292	}
	293
cb60a422	294	page = (unsigned long) info->eap;
cb60a422	295	page >>= 1;
6099e419 A	296	if (info->xeap & 1)
	297	page \|= 0x80000000;
	298	page >>= (PAGE_SHIFT - 1);
cb60a422	299	row = edac_mc_find_csrow_by_page(mci, page);
420390f0	300
6099e419 A	301	if (row == -1) {
	302	i82975x_mc_printk(mci, KERN_ERR, "error processing EAP:\n"
	303	"\tXEAP=%u\n"
	304	"\t EAP=0x%08x\n"
	305	"\tPAGE=0x%08x\n",
	306	(info->xeap & 1) ? 1 : 0, info->eap, (unsigned int) page);
	307	return 0;
	308	}
	309	chan = (mci->csrows[row].nr_channels == 1) ? 0 : info->eap & 1;
	310	offst = info->eap
	311	& ((1 << PAGE_SHIFT) -
084a4fcc	312	(1 << mci->csrows[row].channels[chan].dimm->grain));
6099e419	313
420390f0	314	if (info->errsts & 0x0002)
cb60a422	315	edac_mc_handle_ue(mci, page, offst , row, "i82975x UE");
420390f0	316	else
cb60a422	317	edac_mc_handle_ce(mci, page, offst, info->derrsyn, row,
6099e419	318	chan, "i82975x CE");
420390f0 RD	319
	320	return 1;
	321	}
	322
	323	static void i82975x_check(struct mem_ctl_info *mci)
	324	{
	325	struct i82975x_error_info info;
	326
	327	debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
	328	i82975x_get_error_info(mci, &info);
	329	i82975x_process_error_info(mci, &info, 1);
	330	}
	331
	332	/* Return 1 if dual channel mode is active. Else return 0. */
	333	static int dual_channel_active(void __iomem *mch_window)
	334	{
	335	/*
	336	* We treat interleaved-symmetric configuration as dual-channel - EAP's
	337	* bit-0 giving the channel of the error location.
	338	*
	339	* All other configurations are treated as single channel - the EAP's
	340	* bit-0 will resolve ok in symmetric area of mixed
	341	* (symmetric/asymmetric) configurations
	342	*/
	343	u8 drb[4][2];
	344	int row;
	345	int dualch;
	346
	347	for (dualch = 1, row = 0; dualch && (row < 4); row++) {
	348	drb[row][0] = readb(mch_window + I82975X_DRB + row);
	349	drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
	350	dualch = dualch && (drb[row][0] == drb[row][1]);
	351	}
	352	return dualch;
	353	}
	354
	355	static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
	356	{
	357	/*
7ba99575	358	* ECC is possible on i92975x ONLY with DEV_X8
420390f0 RD	359	*/
	360	return DEV_X8;
	361	}
	362
	363	static void i82975x_init_csrows(struct mem_ctl_info *mci,
	364	struct pci_dev pdev, void __iomem mch_window)
	365	{
cb60a422 A	366	static const char *labels[4] = {
	367	"DIMM A1", "DIMM A2",
	368	"DIMM B1", "DIMM B2"
	369	};
420390f0 RD	370	struct csrow_info *csrow;
	371	unsigned long last_cumul_size;
	372	u8 value;
a895bf8b	373	u32 cumul_size, nr_pages;
cb60a422	374	int index, chan;
084a4fcc MCC	375	struct dimm_info *dimm;
084a4fcc MCC	376	enum dev_type dtype;
420390f0 RD	377
	378	last_cumul_size = 0;
	379
	380	/*
	381	* 82875 comment:
	382	* The dram row boundary (DRB) reg values are boundary address
	383	* for each DRAM row with a granularity of 32 or 64MB (single/dual
	384	* channel operation). DRB regs are cumulative; therefore DRB7 will
cb60a422	385	* contain the total memory contained in all rows.
420390f0 RD	386	*
	387	*/
	388
	389	for (index = 0; index < mci->nr_csrows; index++) {
	390	csrow = &mci->csrows[index];
	391
	392	value = readb(mch_window + I82975X_DRB + index +
	393	((index >= 4) ? 0x80 : 0));
	394	cumul_size = value;
	395	cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
cb60a422 A	396	/*
	397	* Adjust cumul_size w.r.t number of channels
	398	*
	399	*/
	400	if (csrow->nr_channels > 1)
	401	cumul_size <<= 1;
420390f0 RD	402	debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
420390f0 RD	403	cumul_size);
cb60a422	404
a895bf8b	405	nr_pages = cumul_size - last_cumul_size;
cb60a422 A	406	/*
	407	* Initialise dram labels
	408	* index values:
	409	* [0-7] for single-channel; i.e. csrow->nr_channels = 1
	410	* [0-3] for dual-channel; i.e. csrow->nr_channels = 2
	411	*/
084a4fcc MCC	412	dtype = i82975x_dram_type(mch_window, index);
	413	for (chan = 0; chan < csrow->nr_channels; chan++) {
	414	dimm = mci->csrows[index].channels[chan].dimm;
a895bf8b MCC	415
	416	if (!nr_pages)
	417	continue;
	418
	419	dimm->nr_pages = nr_pages / csrow->nr_channels;
a7d7d2e1	420	strncpy(csrow->channels[chan].dimm->label,
cb60a422 A	421	labels[(index >> 1) + (chan * 2)],
cb60a422 A	422	EDAC_MC_LABEL_LEN);
084a4fcc MCC	423	dimm->grain = 1 << 7; /* 128Byte cache-line resolution */
	424	dimm->dtype = i82975x_dram_type(mch_window, index);
	425	dimm->mtype = MEM_DDR2; /* I82975x supports only DDR2 */
	426	dimm->edac_mode = EDAC_SECDED; /* only supported */
	427	}
cb60a422	428
a895bf8b	429	if (!nr_pages)
420390f0 RD	430	continue; /* not populated */
	431
	432	csrow->first_page = last_cumul_size;
	433	csrow->last_page = cumul_size - 1;
420390f0	434	last_cumul_size = cumul_size;
420390f0 RD	435	}
	436	}
	437
	438	/* #define i82975x_DEBUG_IOMEM */
	439
	440	#ifdef i82975x_DEBUG_IOMEM
	441	static void i82975x_print_dram_timings(void __iomem *mch_window)
	442	{
	443	/*
	444	* The register meanings are from Intel specs;
	445	* (shows 13-5-5-5 for 800-DDR2)
	446	* Asus P5W Bios reports 15-5-4-4
	447	* What's your religion?
	448	*/
	449	static const int caslats[4] = { 5, 4, 3, 6 };
	450	u32 dtreg[2];
	451
	452	dtreg[0] = readl(mch_window + 0x114);
	453	dtreg[1] = readl(mch_window + 0x194);
	454	i82975x_printk(KERN_INFO, "DRAM Timings : Ch0 Ch1\n"
	455	" RAS Active Min = %d %d\n"
	456	" CAS latency = %d %d\n"
	457	" RAS to CAS = %d %d\n"
	458	" RAS precharge = %d %d\n",
	459	(dtreg[0] >> 19 ) & 0x0f,
	460	(dtreg[1] >> 19) & 0x0f,
	461	caslats[(dtreg[0] >> 8) & 0x03],
	462	caslats[(dtreg[1] >> 8) & 0x03],
	463	((dtreg[0] >> 4) & 0x07) + 2,
	464	((dtreg[1] >> 4) & 0x07) + 2,
	465	(dtreg[0] & 0x07) + 2,
	466	(dtreg[1] & 0x07) + 2
	467	);
	468
	469	}
	470	#endif
	471
	472	static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
	473	{
	474	int rc = -ENODEV;
	475	struct mem_ctl_info *mci;
	476	struct i82975x_pvt *pvt;
	477	void __iomem *mch_window;
	478	u32 mchbar;
	479	u32 drc[2];
	480	struct i82975x_error_info discard;
	481	int chans;
	482	#ifdef i82975x_DEBUG_IOMEM
	483	u8 c0drb[4];
	484	u8 c1drb[4];
	485	#endif
	486
	487	debugf0("%s()\n", __func__);
	488
	489	pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
	490	if (!(mchbar & 1)) {
	491	debugf3("%s(): failed, MCHBAR disabled!\n", __func__);
	492	goto fail0;
	493	}
	494	mchbar &= 0xffffc000; /* bits 31:14 used for 16K window */
	495	mch_window = ioremap_nocache(mchbar, 0x1000);
	496
	497	#ifdef i82975x_DEBUG_IOMEM
	498	i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
499	mchbar, mch_window);
500
501	c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
502	c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
503	c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
504	c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
505	c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
506	c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
507	c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
508	c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
509	i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
510	i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
511	i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
512	i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
513	i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
514	i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
515	i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
516	i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
517	#endif
518
519	drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
520	drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
521	#ifdef i82975x_DEBUG_IOMEM
522	i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
523	((drc[0] >> 21) & 3) == 1 ?
524	"ECC enabled" : "ECC disabled");
525	i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
526	((drc[1] >> 21) & 3) == 1 ?
527	"ECC enabled" : "ECC disabled");
528
529	i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
530	readw(mch_window + I82975X_C0BNKARC));
531	i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
532	readw(mch_window + I82975X_C1BNKARC));
533	i82975x_print_dram_timings(mch_window);
534	goto fail1;
535	#endif
536	if (!(((drc[0] >> 21) & 3) == 1 \|\| ((drc[1] >> 21) & 3) == 1)) {
537	i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
538	goto fail1;
539	}
540
541	chans = dual_channel_active(mch_window) + 1;
542
543	/* assuming only one controller, index thus is 0 */
544	mci = edac_mc_alloc(sizeof(*pvt), I82975X_NR_CSROWS(chans),
545	chans, 0);
546	if (!mci) {
547	rc = -ENOMEM;
548	goto fail1;
549	}
550
551	debugf3("%s(): init mci\n", __func__);
552	mci->dev = &pdev->dev;
da95b3d2	553	mci->mtype_cap = MEM_FLAG_DDR2;
420390f0 RD	554	mci->edac_ctl_cap = EDAC_FLAG_NONE \| EDAC_FLAG_SECDED;
	555	mci->edac_cap = EDAC_FLAG_NONE \| EDAC_FLAG_SECDED;
	556	mci->mod_name = EDAC_MOD_STR;
	557	mci->mod_ver = I82975X_REVISION;
	558	mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
da95b3d2	559	mci->dev_name = pci_name(pdev);
420390f0 RD	560	mci->edac_check = i82975x_check;
	561	mci->ctl_page_to_phys = NULL;
	562	debugf3("%s(): init pvt\n", __func__);
	563	pvt = (struct i82975x_pvt *) mci->pvt_info;
	564	pvt->mch_window = mch_window;
	565	i82975x_init_csrows(mci, pdev, mch_window);
da95b3d2	566	mci->scrub_mode = SCRUB_HW_SRC;
420390f0 RD	567	i82975x_get_error_info(mci, &discard); /* clear counters */
	568
	569	/* finalize this instance of memory controller with edac core */
	570	if (edac_mc_add_mc(mci)) {
	571	debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
	572	goto fail2;
	573	}
	574
	575	/* get this far and it's successful */
	576	debugf3("%s(): success\n", __func__);
	577	return 0;
	578
	579	fail2:
	580	edac_mc_free(mci);
	581
	582	fail1:
	583	iounmap(mch_window);
	584	fail0:
	585	return rc;
	586	}
	587
	588	/* returns count (>= 0), or negative on error */
	589	static int __devinit i82975x_init_one(struct pci_dev *pdev,
	590	const struct pci_device_id *ent)
	591	{
	592	int rc;
	593
	594	debugf0("%s()\n", __func__);
	595
	596	if (pci_enable_device(pdev) < 0)
	597	return -EIO;
	598
	599	rc = i82975x_probe1(pdev, ent->driver_data);
	600
	601	if (mci_pdev == NULL)
	602	mci_pdev = pci_dev_get(pdev);
	603
	604	return rc;
	605	}
	606
	607	static void __devexit i82975x_remove_one(struct pci_dev *pdev)
	608	{
	609	struct mem_ctl_info *mci;
	610	struct i82975x_pvt *pvt;
	611
	612	debugf0("%s()\n", __func__);
	613
	614	mci = edac_mc_del_mc(&pdev->dev);
	615	if (mci == NULL)
	616	return;
	617
	618	pvt = mci->pvt_info;
	619	if (pvt->mch_window)
	620	iounmap( pvt->mch_window );
	621
	622	edac_mc_free(mci);
	623	}
	624
36c46f31	625	static DEFINE_PCI_DEVICE_TABLE(i82975x_pci_tbl) = {
420390f0 RD	626	{
	627	PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	628	I82975X
	629	},
	630	{
	631	0,
	632	} /* 0 terminated list. */
	633	};
	634
	635	MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);
	636
	637	static struct pci_driver i82975x_driver = {
	638	.name = EDAC_MOD_STR,
	639	.probe = i82975x_init_one,
	640	.remove = __devexit_p(i82975x_remove_one),
	641	.id_table = i82975x_pci_tbl,
	642	};
	643
	644	static int __init i82975x_init(void)
	645	{
	646	int pci_rc;
	647
	648	debugf3("%s()\n", __func__);
	649
c3c52bce HM	650	/* Ensure that the OPSTATE is set correctly for POLL or NMI */
	651	opstate_init();
	652
420390f0 RD	653	pci_rc = pci_register_driver(&i82975x_driver);
	654	if (pci_rc < 0)
	655	goto fail0;
	656
	657	if (mci_pdev == NULL) {
	658	mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
	659	PCI_DEVICE_ID_INTEL_82975_0, NULL);
	660
	661	if (!mci_pdev) {
	662	debugf0("i82975x pci_get_device fail\n");
	663	pci_rc = -ENODEV;
	664	goto fail1;
	665	}
	666
	667	pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);
	668
	669	if (pci_rc < 0) {
	670	debugf0("i82975x init fail\n");
	671	pci_rc = -ENODEV;
	672	goto fail1;
	673	}
	674	}
	675
	676	return 0;
	677
	678	fail1:
	679	pci_unregister_driver(&i82975x_driver);
	680
	681	fail0:
	682	if (mci_pdev != NULL)
	683	pci_dev_put(mci_pdev);
	684
	685	return pci_rc;
	686	}
	687
	688	static void __exit i82975x_exit(void)
	689	{
	690	debugf3("%s()\n", __func__);
	691
	692	pci_unregister_driver(&i82975x_driver);
	693
	694	if (!i82975x_registered) {
	695	i82975x_remove_one(mci_pdev);
	696	pci_dev_put(mci_pdev);
	697	}
	698	}
	699
	700	module_init(i82975x_init);
	701	module_exit(i82975x_exit);
	702
	703	MODULE_LICENSE("GPL");
25527885	704	MODULE_AUTHOR("Arvind R. <arvino55@gmail.com>");
420390f0	705	MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");
c3c52bce HM	706
	707	module_param(edac_op_state, int, 0444);
	708	MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");