[linux.git] / drivers / edac / x38_edac.c

/*
 * Intel X38 Memory Controller kernel module
 * Copyright (C) 2008 Cluster Computing, Inc.
 *
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * This file is based on i3200_edac.c
 *
 */

#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 X38_REVISION		"1.1"

#define EDAC_MOD_STR		"x38_edac"

#define PCI_DEVICE_ID_INTEL_X38_HB	0x29e0

#define X38_RANKS		8
#define X38_RANKS_PER_CHANNEL	4
#define X38_CHANNELS		2

/* Intel X38 register addresses - device 0 function 0 - DRAM Controller */

#define X38_MCHBAR_LOW	0x48	/* MCH Memory Mapped Register BAR */
#define X38_MCHBAR_HIGH	0x4c
#define X38_MCHBAR_MASK	0xfffffc000ULL	/* bits 35:14 */
#define X38_MMR_WINDOW_SIZE	16384

#define X38_TOM	0xa0	/* Top of Memory (16b)
				 *
				 * 15:10 reserved
				 *  9:0  total populated physical memory
				 */
#define X38_TOM_MASK	0x3ff	/* bits 9:0 */
#define X38_TOM_SHIFT 26	/* 64MiB grain */

#define X38_ERRSTS	0xc8	/* Error Status Register (16b)
				 *
				 * 15    reserved
				 * 14    Isochronous TBWRR Run Behind FIFO Full
				 *       (ITCV)
				 * 13    Isochronous TBWRR Run Behind FIFO Put
				 *       (ITSTV)
				 * 12    reserved
				 * 11    MCH Thermal Sensor Event
				 *       for SMI/SCI/SERR (GTSE)
				 * 10    reserved
				 *  9    LOCK to non-DRAM Memory Flag (LCKF)
				 *  8    reserved
				 *  7    DRAM Throttle Flag (DTF)
				 *  6:2  reserved
				 *  1    Multi-bit DRAM ECC Error Flag (DMERR)
				 *  0    Single-bit DRAM ECC Error Flag (DSERR)
				 */
#define X38_ERRSTS_UE		0x0002
#define X38_ERRSTS_CE		0x0001
#define X38_ERRSTS_BITS	(X38_ERRSTS_UE | X38_ERRSTS_CE)


/* Intel  MMIO register space - device 0 function 0 - MMR space */

#define X38_C0DRB	0x200	/* Channel 0 DRAM Rank Boundary (16b x 4)
				 *
				 * 15:10 reserved
				 *  9:0  Channel 0 DRAM Rank Boundary Address
				 */
#define X38_C1DRB	0x600	/* Channel 1 DRAM Rank Boundary (16b x 4) */
#define X38_DRB_MASK	0x3ff	/* bits 9:0 */
#define X38_DRB_SHIFT 26	/* 64MiB grain */

#define X38_C0ECCERRLOG 0x280	/* Channel 0 ECC Error Log (64b)
				 *
				 * 63:48 Error Column Address (ERRCOL)
				 * 47:32 Error Row Address (ERRROW)
				 * 31:29 Error Bank Address (ERRBANK)
				 * 28:27 Error Rank Address (ERRRANK)
				 * 26:24 reserved
				 * 23:16 Error Syndrome (ERRSYND)
				 * 15: 2 reserved
				 *    1  Multiple Bit Error Status (MERRSTS)
				 *    0  Correctable Error Status (CERRSTS)
				 */
#define X38_C1ECCERRLOG 0x680	/* Channel 1 ECC Error Log (64b) */
#define X38_ECCERRLOG_CE	0x1
#define X38_ECCERRLOG_UE	0x2
#define X38_ECCERRLOG_RANK_BITS	0x18000000
#define X38_ECCERRLOG_SYNDROME_BITS	0xff0000

#define X38_CAPID0 0xe0	/* see P.94 of spec for details */

static int x38_channel_num;

static int how_many_channel(struct pci_dev *pdev)
{
	unsigned char capid0_8b; /* 8th byte of CAPID0 */

	pci_read_config_byte(pdev, X38_CAPID0 + 8, &capid0_8b);
	if (capid0_8b & 0x20) {	/* check DCD: Dual Channel Disable */
		edac_dbg(0, "In single channel mode\n");
		x38_channel_num = 1;
	} else {
		edac_dbg(0, "In dual channel mode\n");
		x38_channel_num = 2;
	}

	return x38_channel_num;
}

static unsigned long eccerrlog_syndrome(u64 log)
{
	return (log & X38_ECCERRLOG_SYNDROME_BITS) >> 16;
}

static int eccerrlog_row(int channel, u64 log)
{
	return ((log & X38_ECCERRLOG_RANK_BITS) >> 27) |
		(channel * X38_RANKS_PER_CHANNEL);
}

enum x38_chips {
	X38 = 0,
};

struct x38_dev_info {
	const char *ctl_name;
};

struct x38_error_info {
	u16 errsts;
	u16 errsts2;
	u64 eccerrlog[X38_CHANNELS];
};

static const struct x38_dev_info x38_devs[] = {
	[X38] = {
		.ctl_name = "x38"},
};

static struct pci_dev *mci_pdev;
static int x38_registered = 1;


static void x38_clear_error_info(struct mem_ctl_info *mci)
{
	struct pci_dev *pdev;

	pdev = to_pci_dev(mci->pdev);

	/*
	 * Clear any error bits.
	 * (Yes, we really clear bits by writing 1 to them.)
	 */
	pci_write_bits16(pdev, X38_ERRSTS, X38_ERRSTS_BITS,
			 X38_ERRSTS_BITS);
}

static u64 x38_readq(const void __iomem *addr)
{
	return readl(addr) | (((u64)readl(addr + 4)) << 32);
}

static void x38_get_and_clear_error_info(struct mem_ctl_info *mci,
				 struct x38_error_info *info)
{
	struct pci_dev *pdev;
	void __iomem *window = mci->pvt_info;

	pdev = to_pci_dev(mci->pdev);

	/*
	 * 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, X38_ERRSTS, &info->errsts);
	if (!(info->errsts & X38_ERRSTS_BITS))
		return;

	info->eccerrlog[0] = x38_readq(window + X38_C0ECCERRLOG);
	if (x38_channel_num == 2)
		info->eccerrlog[1] = x38_readq(window + X38_C1ECCERRLOG);

	pci_read_config_word(pdev, X38_ERRSTS, &info->errsts2);

	/*
	 * If the error is the same for both reads then the first set
	 * of reads is valid.  If there is a change then there is a CE
	 * with no info and the second set of reads is valid and
	 * should be UE info.
	 */
	if ((info->errsts ^ info->errsts2) & X38_ERRSTS_BITS) {
		info->eccerrlog[0] = x38_readq(window + X38_C0ECCERRLOG);
		if (x38_channel_num == 2)
			info->eccerrlog[1] =
				x38_readq(window + X38_C1ECCERRLOG);
	}

	x38_clear_error_info(mci);
}

static void x38_process_error_info(struct mem_ctl_info *mci,
				struct x38_error_info *info)
{
	int channel;
	u64 log;

	if (!(info->errsts & X38_ERRSTS_BITS))
		return;

	if ((info->errsts ^ info->errsts2) & X38_ERRSTS_BITS) {
		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
				     -1, -1, -1,
				     "UE overwrote CE", "");
		info->errsts = info->errsts2;
	}

	for (channel = 0; channel < x38_channel_num; channel++) {
		log = info->eccerrlog[channel];
		if (log & X38_ECCERRLOG_UE) {
			edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
					     0, 0, 0,
					     eccerrlog_row(channel, log),
					     -1, -1,
					     "x38 UE", "");
		} else if (log & X38_ECCERRLOG_CE) {
			edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
					     0, 0, eccerrlog_syndrome(log),
					     eccerrlog_row(channel, log),
					     -1, -1,
					     "x38 CE", "");
		}
	}
}

static void x38_check(struct mem_ctl_info *mci)
{
	struct x38_error_info info;

	edac_dbg(1, "MC%d\n", mci->mc_idx);
	x38_get_and_clear_error_info(mci, &info);
	x38_process_error_info(mci, &info);
}


void __iomem *x38_map_mchbar(struct pci_dev *pdev)
{
	union {
		u64 mchbar;
		struct {
			u32 mchbar_low;
			u32 mchbar_high;
		};
	} u;
	void __iomem *window;

	pci_read_config_dword(pdev, X38_MCHBAR_LOW, &u.mchbar_low);
	pci_write_config_dword(pdev, X38_MCHBAR_LOW, u.mchbar_low | 0x1);
	pci_read_config_dword(pdev, X38_MCHBAR_HIGH, &u.mchbar_high);
	u.mchbar &= X38_MCHBAR_MASK;

	if (u.mchbar != (resource_size_t)u.mchbar) {
		printk(KERN_ERR
			"x38: mmio space beyond accessible range (0x%llx)\n",
			(unsigned long long)u.mchbar);
		return NULL;
	}

	window = ioremap_nocache(u.mchbar, X38_MMR_WINDOW_SIZE);
	if (!window)
		printk(KERN_ERR "x38: cannot map mmio space at 0x%llx\n",
			(unsigned long long)u.mchbar);

	return window;
}


static void x38_get_drbs(void __iomem *window,
			u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL])
{
	int i;

	for (i = 0; i < X38_RANKS_PER_CHANNEL; i++) {
		drbs[0][i] = readw(window + X38_C0DRB + 2*i) & X38_DRB_MASK;
		drbs[1][i] = readw(window + X38_C1DRB + 2*i) & X38_DRB_MASK;
	}
}

static bool x38_is_stacked(struct pci_dev *pdev,
			u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL])
{
	u16 tom;

	pci_read_config_word(pdev, X38_TOM, &tom);
	tom &= X38_TOM_MASK;

	return drbs[X38_CHANNELS - 1][X38_RANKS_PER_CHANNEL - 1] == tom;
}

static unsigned long drb_to_nr_pages(
			u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL],
			bool stacked, int channel, int rank)
{
	int n;

	n = drbs[channel][rank];
	if (rank > 0)
		n -= drbs[channel][rank - 1];
	if (stacked && (channel == 1) && drbs[channel][rank] ==
				drbs[channel][X38_RANKS_PER_CHANNEL - 1]) {
		n -= drbs[0][X38_RANKS_PER_CHANNEL - 1];
	}

	n <<= (X38_DRB_SHIFT - PAGE_SHIFT);
	return n;
}

static int x38_probe1(struct pci_dev *pdev, int dev_idx)
{
	int rc;
	int i, j;
	struct mem_ctl_info *mci = NULL;
	struct edac_mc_layer layers[2];
	u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL];
	bool stacked;
	void __iomem *window;

	edac_dbg(0, "MC:\n");

	window = x38_map_mchbar(pdev);
	if (!window)
		return -ENODEV;

	x38_get_drbs(window, drbs);

	how_many_channel(pdev);

	/* FIXME: unconventional pvt_info usage */
	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
	layers[0].size = X38_RANKS;
	layers[0].is_virt_csrow = true;
	layers[1].type = EDAC_MC_LAYER_CHANNEL;
	layers[1].size = x38_channel_num;
	layers[1].is_virt_csrow = false;
	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
	if (!mci)
		return -ENOMEM;

	edac_dbg(3, "MC: init mci\n");

	mci->pdev = &pdev->dev;
	mci->mtype_cap = MEM_FLAG_DDR2;

	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
	mci->edac_cap = EDAC_FLAG_SECDED;

	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = X38_REVISION;
	mci->ctl_name = x38_devs[dev_idx].ctl_name;
	mci->dev_name = pci_name(pdev);
	mci->edac_check = x38_check;
	mci->ctl_page_to_phys = NULL;
	mci->pvt_info = window;

	stacked = x38_is_stacked(pdev, drbs);

	/*
	 * The dram rank boundary (DRB) reg values are boundary addresses
	 * for each DRAM rank with a granularity of 64MB.  DRB regs are
	 * cumulative; the last one will contain the total memory
	 * contained in all ranks.
	 */
	for (i = 0; i < mci->nr_csrows; i++) {
		unsigned long nr_pages;
		struct csrow_info *csrow = mci->csrows[i];

		nr_pages = drb_to_nr_pages(drbs, stacked,
			i / X38_RANKS_PER_CHANNEL,
			i % X38_RANKS_PER_CHANNEL);

		if (nr_pages == 0)
			continue;

		for (j = 0; j < x38_channel_num; j++) {
			struct dimm_info *dimm = csrow->channels[j]->dimm;

			dimm->nr_pages = nr_pages / x38_channel_num;
			dimm->grain = nr_pages << PAGE_SHIFT;
			dimm->mtype = MEM_DDR2;
			dimm->dtype = DEV_UNKNOWN;
			dimm->edac_mode = EDAC_UNKNOWN;
		}
	}

	x38_clear_error_info(mci);

	rc = -ENODEV;
	if (edac_mc_add_mc(mci)) {
		edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
		goto fail;
	}

	/* get this far and it's successful */
	edac_dbg(3, "MC: success\n");
	return 0;

fail:
	iounmap(window);
	if (mci)
		edac_mc_free(mci);

	return rc;
}

static int x38_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	int rc;

	edac_dbg(0, "MC:\n");

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

	rc = x38_probe1(pdev, ent->driver_data);
	if (!mci_pdev)
		mci_pdev = pci_dev_get(pdev);

	return rc;
}

static void x38_remove_one(struct pci_dev *pdev)
{
	struct mem_ctl_info *mci;

	edac_dbg(0, "\n");

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

	iounmap(mci->pvt_info);

	edac_mc_free(mci);
}

static DEFINE_PCI_DEVICE_TABLE(x38_pci_tbl) = {
	{
	 PCI_VEND_DEV(INTEL, X38_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	 X38},
	{
	 0,
	 }			/* 0 terminated list. */
};

MODULE_DEVICE_TABLE(pci, x38_pci_tbl);

static struct pci_driver x38_driver = {
	.name = EDAC_MOD_STR,
	.probe = x38_init_one,
	.remove = x38_remove_one,
	.id_table = x38_pci_tbl,
};

static int __init x38_init(void)
{
	int pci_rc;

	edac_dbg(3, "MC:\n");

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

	pci_rc = pci_register_driver(&x38_driver);
	if (pci_rc < 0)
		goto fail0;

	if (!mci_pdev) {
		x38_registered = 0;
		mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
					PCI_DEVICE_ID_INTEL_X38_HB, NULL);
		if (!mci_pdev) {
			edac_dbg(0, "x38 pci_get_device fail\n");
			pci_rc = -ENODEV;
			goto fail1;
		}

		pci_rc = x38_init_one(mci_pdev, x38_pci_tbl);
		if (pci_rc < 0) {
			edac_dbg(0, "x38 init fail\n");
			pci_rc = -ENODEV;
			goto fail1;
		}
	}

	return 0;

fail1:
	pci_unregister_driver(&x38_driver);

fail0:
	if (mci_pdev)
		pci_dev_put(mci_pdev);

	return pci_rc;
}

static void __exit x38_exit(void)
{
	edac_dbg(3, "MC:\n");

	pci_unregister_driver(&x38_driver);
	if (!x38_registered) {
		x38_remove_one(mci_pdev);
		pci_dev_put(mci_pdev);
	}
}

module_init(x38_init);
module_exit(x38_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Cluster Computing, Inc. Hitoshi Mitake");
MODULE_DESCRIPTION("MC support for Intel X38 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
df8bc08c HM	1	/*
	2	* Intel X38 Memory Controller kernel module
	3	* Copyright (C) 2008 Cluster Computing, Inc.
	4	*
	5	* This file may be distributed under the terms of the
	6	* GNU General Public License.
	7	*
	8	* This file is based on i3200_edac.c
	9	*
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/pci.h>
	15	#include <linux/pci_ids.h>
df8bc08c HM	16	#include <linux/edac.h>
	17	#include "edac_core.h"
	18
	19	#define X38_REVISION "1.1"
	20
	21	#define EDAC_MOD_STR "x38_edac"
	22
	23	#define PCI_DEVICE_ID_INTEL_X38_HB 0x29e0
	24
	25	#define X38_RANKS 8
	26	#define X38_RANKS_PER_CHANNEL 4
	27	#define X38_CHANNELS 2
	28
	29	/* Intel X38 register addresses - device 0 function 0 - DRAM Controller */
	30
	31	#define X38_MCHBAR_LOW 0x48 /* MCH Memory Mapped Register BAR */
3d768213	32	#define X38_MCHBAR_HIGH 0x4c
df8bc08c HM	33	#define X38_MCHBAR_MASK 0xfffffc000ULL /* bits 35:14 */
	34	#define X38_MMR_WINDOW_SIZE 16384
	35
	36	#define X38_TOM 0xa0 /* Top of Memory (16b)
	37	*
	38	* 15:10 reserved
	39	* 9:0 total populated physical memory
	40	*/
	41	#define X38_TOM_MASK 0x3ff /* bits 9:0 */
	42	#define X38_TOM_SHIFT 26 /* 64MiB grain */
	43
	44	#define X38_ERRSTS 0xc8 /* Error Status Register (16b)
	45	*
	46	* 15 reserved
	47	* 14 Isochronous TBWRR Run Behind FIFO Full
	48	* (ITCV)
	49	* 13 Isochronous TBWRR Run Behind FIFO Put
	50	* (ITSTV)
	51	* 12 reserved
	52	* 11 MCH Thermal Sensor Event
	53	* for SMI/SCI/SERR (GTSE)
	54	* 10 reserved
	55	* 9 LOCK to non-DRAM Memory Flag (LCKF)
	56	* 8 reserved
	57	* 7 DRAM Throttle Flag (DTF)
	58	* 6:2 reserved
	59	* 1 Multi-bit DRAM ECC Error Flag (DMERR)
	60	* 0 Single-bit DRAM ECC Error Flag (DSERR)
	61	*/
	62	#define X38_ERRSTS_UE 0x0002
	63	#define X38_ERRSTS_CE 0x0001
	64	#define X38_ERRSTS_BITS (X38_ERRSTS_UE \| X38_ERRSTS_CE)
	65
	66
	67	/* Intel MMIO register space - device 0 function 0 - MMR space */
	68
	69	#define X38_C0DRB 0x200 /* Channel 0 DRAM Rank Boundary (16b x 4)
	70	*
	71	* 15:10 reserved
	72	* 9:0 Channel 0 DRAM Rank Boundary Address
	73	*/
	74	#define X38_C1DRB 0x600 /* Channel 1 DRAM Rank Boundary (16b x 4) */
	75	#define X38_DRB_MASK 0x3ff /* bits 9:0 */
	76	#define X38_DRB_SHIFT 26 /* 64MiB grain */
	77
	78	#define X38_C0ECCERRLOG 0x280 /* Channel 0 ECC Error Log (64b)
	79	*
	80	* 63:48 Error Column Address (ERRCOL)
	81	* 47:32 Error Row Address (ERRROW)
	82	* 31:29 Error Bank Address (ERRBANK)
	83	* 28:27 Error Rank Address (ERRRANK)
	84	* 26:24 reserved
	85	* 23:16 Error Syndrome (ERRSYND)
	86	* 15: 2 reserved
	87	* 1 Multiple Bit Error Status (MERRSTS)
	88	* 0 Correctable Error Status (CERRSTS)
	89	*/
	90	#define X38_C1ECCERRLOG 0x680 /* Channel 1 ECC Error Log (64b) */
	91	#define X38_ECCERRLOG_CE 0x1
	92	#define X38_ECCERRLOG_UE 0x2
	93	#define X38_ECCERRLOG_RANK_BITS 0x18000000
	94	#define X38_ECCERRLOG_SYNDROME_BITS 0xff0000
	95
	96	#define X38_CAPID0 0xe0 /* see P.94 of spec for details */
97
98	static int x38_channel_num;
99
100	static int how_many_channel(struct pci_dev *pdev)
101	{
102	unsigned char capid0_8b; /* 8th byte of CAPID0 */
103
104	pci_read_config_byte(pdev, X38_CAPID0 + 8, &capid0_8b);
105	if (capid0_8b & 0x20) { /* check DCD: Dual Channel Disable */
956b9ba1	106	edac_dbg(0, "In single channel mode\n");
df8bc08c HM	107	x38_channel_num = 1;
df8bc08c HM	108	} else {
956b9ba1	109	edac_dbg(0, "In dual channel mode\n");
df8bc08c HM	110	x38_channel_num = 2;
	111	}
	112
	113	return x38_channel_num;
	114	}
	115
	116	static unsigned long eccerrlog_syndrome(u64 log)
	117	{
	118	return (log & X38_ECCERRLOG_SYNDROME_BITS) >> 16;
	119	}
	120
	121	static int eccerrlog_row(int channel, u64 log)
	122	{
	123	return ((log & X38_ECCERRLOG_RANK_BITS) >> 27) \|
	124	(channel * X38_RANKS_PER_CHANNEL);
	125	}
	126
	127	enum x38_chips {
	128	X38 = 0,
	129	};
	130
	131	struct x38_dev_info {
	132	const char *ctl_name;
	133	};
	134
	135	struct x38_error_info {
	136	u16 errsts;
	137	u16 errsts2;
	138	u64 eccerrlog[X38_CHANNELS];
	139	};
	140
	141	static const struct x38_dev_info x38_devs[] = {
	142	[X38] = {
	143	.ctl_name = "x38"},
	144	};
	145
	146	static struct pci_dev *mci_pdev;
	147	static int x38_registered = 1;
	148
	149
	150	static void x38_clear_error_info(struct mem_ctl_info *mci)
	151	{
	152	struct pci_dev *pdev;
	153
fd687502	154	pdev = to_pci_dev(mci->pdev);
df8bc08c HM	155
	156	/*
	157	* Clear any error bits.
	158	* (Yes, we really clear bits by writing 1 to them.)
	159	*/
	160	pci_write_bits16(pdev, X38_ERRSTS, X38_ERRSTS_BITS,
	161	X38_ERRSTS_BITS);
	162	}
	163
	164	static u64 x38_readq(const void __iomem *addr)
	165	{
	166	return readl(addr) \| (((u64)readl(addr + 4)) << 32);
	167	}
	168
	169	static void x38_get_and_clear_error_info(struct mem_ctl_info *mci,
	170	struct x38_error_info *info)
	171	{
	172	struct pci_dev *pdev;
	173	void __iomem *window = mci->pvt_info;
	174
fd687502	175	pdev = to_pci_dev(mci->pdev);
df8bc08c HM	176
	177	/*
	178	* This is a mess because there is no atomic way to read all the
	179	* registers at once and the registers can transition from CE being
	180	* overwritten by UE.
	181	*/
	182	pci_read_config_word(pdev, X38_ERRSTS, &info->errsts);
	183	if (!(info->errsts & X38_ERRSTS_BITS))
	184	return;
	185
	186	info->eccerrlog[0] = x38_readq(window + X38_C0ECCERRLOG);
	187	if (x38_channel_num == 2)
	188	info->eccerrlog[1] = x38_readq(window + X38_C1ECCERRLOG);
	189
	190	pci_read_config_word(pdev, X38_ERRSTS, &info->errsts2);
	191
	192	/*
	193	* If the error is the same for both reads then the first set
	194	* of reads is valid. If there is a change then there is a CE
	195	* with no info and the second set of reads is valid and
	196	* should be UE info.
	197	*/
	198	if ((info->errsts ^ info->errsts2) & X38_ERRSTS_BITS) {
	199	info->eccerrlog[0] = x38_readq(window + X38_C0ECCERRLOG);
	200	if (x38_channel_num == 2)
	201	info->eccerrlog[1] =
	202	x38_readq(window + X38_C1ECCERRLOG);
	203	}
	204
	205	x38_clear_error_info(mci);
	206	}
	207
	208	static void x38_process_error_info(struct mem_ctl_info *mci,
	209	struct x38_error_info *info)
	210	{
	211	int channel;
	212	u64 log;
	213
	214	if (!(info->errsts & X38_ERRSTS_BITS))
	215	return;
	216
	217	if ((info->errsts ^ info->errsts2) & X38_ERRSTS_BITS) {
9eb07a7f	218	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
e2acc357	219	-1, -1, -1,
03f7eae8	220	"UE overwrote CE", "");
df8bc08c HM	221	info->errsts = info->errsts2;
	222	}
	223
	224	for (channel = 0; channel < x38_channel_num; channel++) {
	225	log = info->eccerrlog[channel];
	226	if (log & X38_ECCERRLOG_UE) {
9eb07a7f	227	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
e2acc357 MCC	228	0, 0, 0,
	229	eccerrlog_row(channel, log),
	230	-1, -1,
03f7eae8	231	"x38 UE", "");
df8bc08c	232	} else if (log & X38_ECCERRLOG_CE) {
9eb07a7f	233	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
e2acc357 MCC	234	0, 0, eccerrlog_syndrome(log),
	235	eccerrlog_row(channel, log),
	236	-1, -1,
03f7eae8	237	"x38 CE", "");
df8bc08c HM	238	}
	239	}
	240	}
	241
	242	static void x38_check(struct mem_ctl_info *mci)
	243	{
	244	struct x38_error_info info;
	245
956b9ba1	246	edac_dbg(1, "MC%d\n", mci->mc_idx);
df8bc08c HM	247	x38_get_and_clear_error_info(mci, &info);
	248	x38_process_error_info(mci, &info);
	249	}
	250
	251
	252	void __iomem x38_map_mchbar(struct pci_dev pdev)
	253	{
	254	union {
	255	u64 mchbar;
	256	struct {
	257	u32 mchbar_low;
	258	u32 mchbar_high;
	259	};
	260	} u;
	261	void __iomem *window;
	262
	263	pci_read_config_dword(pdev, X38_MCHBAR_LOW, &u.mchbar_low);
	264	pci_write_config_dword(pdev, X38_MCHBAR_LOW, u.mchbar_low \| 0x1);
	265	pci_read_config_dword(pdev, X38_MCHBAR_HIGH, &u.mchbar_high);
	266	u.mchbar &= X38_MCHBAR_MASK;
	267
	268	if (u.mchbar != (resource_size_t)u.mchbar) {
	269	printk(KERN_ERR
	270	"x38: mmio space beyond accessible range (0x%llx)\n",
	271	(unsigned long long)u.mchbar);
	272	return NULL;
	273	}
	274
	275	window = ioremap_nocache(u.mchbar, X38_MMR_WINDOW_SIZE);
	276	if (!window)
	277	printk(KERN_ERR "x38: cannot map mmio space at 0x%llx\n",
	278	(unsigned long long)u.mchbar);
	279
	280	return window;
	281	}
	282
	283
	284	static void x38_get_drbs(void __iomem *window,
	285	u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL])
	286	{
	287	int i;
	288
	289	for (i = 0; i < X38_RANKS_PER_CHANNEL; i++) {
	290	drbs[0][i] = readw(window + X38_C0DRB + 2*i) & X38_DRB_MASK;
	291	drbs[1][i] = readw(window + X38_C1DRB + 2*i) & X38_DRB_MASK;
	292	}
	293	}
	294
	295	static bool x38_is_stacked(struct pci_dev *pdev,
	296	u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL])
	297	{
	298	u16 tom;
	299
	300	pci_read_config_word(pdev, X38_TOM, &tom);
	301	tom &= X38_TOM_MASK;
	302
	303	return drbs[X38_CHANNELS - 1][X38_RANKS_PER_CHANNEL - 1] == tom;
	304	}
	305
	306	static unsigned long drb_to_nr_pages(
	307	u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL],
	308	bool stacked, int channel, int rank)
	309	{
	310	int n;
311
312	n = drbs[channel][rank];
313	if (rank > 0)
314	n -= drbs[channel][rank - 1];
315	if (stacked && (channel == 1) && drbs[channel][rank] ==
316	drbs[channel][X38_RANKS_PER_CHANNEL - 1]) {
317	n -= drbs[0][X38_RANKS_PER_CHANNEL - 1];
318	}
319
320	n <<= (X38_DRB_SHIFT - PAGE_SHIFT);
321	return n;
322	}
323
324	static int x38_probe1(struct pci_dev *pdev, int dev_idx)
325	{
326	int rc;
084a4fcc	327	int i, j;
df8bc08c	328	struct mem_ctl_info *mci = NULL;
e2acc357	329	struct edac_mc_layer layers[2];
df8bc08c HM	330	u16 drbs[X38_CHANNELS][X38_RANKS_PER_CHANNEL];
	331	bool stacked;
	332	void __iomem *window;
	333
956b9ba1	334	edac_dbg(0, "MC:\n");
df8bc08c HM	335
	336	window = x38_map_mchbar(pdev);
	337	if (!window)
	338	return -ENODEV;
	339
	340	x38_get_drbs(window, drbs);
	341
	342	how_many_channel(pdev);
	343
	344	/* FIXME: unconventional pvt_info usage */
e2acc357 MCC	345	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
	346	layers[0].size = X38_RANKS;
	347	layers[0].is_virt_csrow = true;
	348	layers[1].type = EDAC_MC_LAYER_CHANNEL;
	349	layers[1].size = x38_channel_num;
	350	layers[1].is_virt_csrow = false;
ca0907b9	351	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
df8bc08c HM	352	if (!mci)
	353	return -ENOMEM;
	354
956b9ba1	355	edac_dbg(3, "MC: init mci\n");
df8bc08c	356
fd687502	357	mci->pdev = &pdev->dev;
df8bc08c HM	358	mci->mtype_cap = MEM_FLAG_DDR2;
	359
	360	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
	361	mci->edac_cap = EDAC_FLAG_SECDED;
	362
	363	mci->mod_name = EDAC_MOD_STR;
	364	mci->mod_ver = X38_REVISION;
	365	mci->ctl_name = x38_devs[dev_idx].ctl_name;
	366	mci->dev_name = pci_name(pdev);
	367	mci->edac_check = x38_check;
	368	mci->ctl_page_to_phys = NULL;
	369	mci->pvt_info = window;
	370
	371	stacked = x38_is_stacked(pdev, drbs);
	372
	373	/*
	374	* The dram rank boundary (DRB) reg values are boundary addresses
	375	* for each DRAM rank with a granularity of 64MB. DRB regs are
	376	* cumulative; the last one will contain the total memory
	377	* contained in all ranks.
	378	*/
df8bc08c HM	379	for (i = 0; i < mci->nr_csrows; i++) {
df8bc08c HM	380	unsigned long nr_pages;
de3910eb	381	struct csrow_info *csrow = mci->csrows[i];
df8bc08c HM	382
	383	nr_pages = drb_to_nr_pages(drbs, stacked,
	384	i / X38_RANKS_PER_CHANNEL,
	385	i % X38_RANKS_PER_CHANNEL);
	386
084a4fcc	387	if (nr_pages == 0)
df8bc08c	388	continue;
df8bc08c	389
084a4fcc	390	for (j = 0; j < x38_channel_num; j++) {
de3910eb	391	struct dimm_info *dimm = csrow->channels[j]->dimm;
a895bf8b MCC	392
a895bf8b MCC	393	dimm->nr_pages = nr_pages / x38_channel_num;
084a4fcc MCC	394	dimm->grain = nr_pages << PAGE_SHIFT;
	395	dimm->mtype = MEM_DDR2;
	396	dimm->dtype = DEV_UNKNOWN;
	397	dimm->edac_mode = EDAC_UNKNOWN;
	398	}
df8bc08c HM	399	}
	400
	401	x38_clear_error_info(mci);
	402
	403	rc = -ENODEV;
	404	if (edac_mc_add_mc(mci)) {
956b9ba1	405	edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
df8bc08c HM	406	goto fail;
	407	}
	408
	409	/* get this far and it's successful */
956b9ba1	410	edac_dbg(3, "MC: success\n");
df8bc08c HM	411	return 0;
	412
	413	fail:
	414	iounmap(window);
	415	if (mci)
	416	edac_mc_free(mci);
	417
	418	return rc;
	419	}
	420
9b3c6e85	421	static int x38_init_one(struct pci_dev pdev, const struct pci_device_id ent)
df8bc08c HM	422	{
	423	int rc;
	424
956b9ba1	425	edac_dbg(0, "MC:\n");
df8bc08c HM	426
	427	if (pci_enable_device(pdev) < 0)
	428	return -EIO;
	429
	430	rc = x38_probe1(pdev, ent->driver_data);
	431	if (!mci_pdev)
	432	mci_pdev = pci_dev_get(pdev);
	433
	434	return rc;
	435	}
	436
9b3c6e85	437	static void x38_remove_one(struct pci_dev *pdev)
df8bc08c HM	438	{
	439	struct mem_ctl_info *mci;
	440
956b9ba1	441	edac_dbg(0, "\n");
df8bc08c HM	442
	443	mci = edac_mc_del_mc(&pdev->dev);
	444	if (!mci)
	445	return;
	446
	447	iounmap(mci->pvt_info);
	448
	449	edac_mc_free(mci);
	450	}
	451
36c46f31	452	static DEFINE_PCI_DEVICE_TABLE(x38_pci_tbl) = {
df8bc08c HM	453	{
	454	PCI_VEND_DEV(INTEL, X38_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	455	X38},
	456	{
	457	0,
	458	} /* 0 terminated list. */
	459	};
	460
	461	MODULE_DEVICE_TABLE(pci, x38_pci_tbl);
	462
	463	static struct pci_driver x38_driver = {
	464	.name = EDAC_MOD_STR,
	465	.probe = x38_init_one,
9b3c6e85	466	.remove = x38_remove_one,
df8bc08c HM	467	.id_table = x38_pci_tbl,
	468	};
	469
	470	static int __init x38_init(void)
	471	{
	472	int pci_rc;
	473
956b9ba1	474	edac_dbg(3, "MC:\n");
df8bc08c HM	475
	476	/* Ensure that the OPSTATE is set correctly for POLL or NMI */
	477	opstate_init();
	478
	479	pci_rc = pci_register_driver(&x38_driver);
	480	if (pci_rc < 0)
	481	goto fail0;
	482
	483	if (!mci_pdev) {
	484	x38_registered = 0;
	485	mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
	486	PCI_DEVICE_ID_INTEL_X38_HB, NULL);
	487	if (!mci_pdev) {
956b9ba1	488	edac_dbg(0, "x38 pci_get_device fail\n");
df8bc08c HM	489	pci_rc = -ENODEV;
	490	goto fail1;
	491	}
	492
	493	pci_rc = x38_init_one(mci_pdev, x38_pci_tbl);
	494	if (pci_rc < 0) {
956b9ba1	495	edac_dbg(0, "x38 init fail\n");
df8bc08c HM	496	pci_rc = -ENODEV;
	497	goto fail1;
	498	}
	499	}
	500
	501	return 0;
	502
	503	fail1:
	504	pci_unregister_driver(&x38_driver);
	505
	506	fail0:
	507	if (mci_pdev)
	508	pci_dev_put(mci_pdev);
	509
	510	return pci_rc;
	511	}
	512
	513	static void __exit x38_exit(void)
	514	{
956b9ba1	515	edac_dbg(3, "MC:\n");
df8bc08c HM	516
	517	pci_unregister_driver(&x38_driver);
	518	if (!x38_registered) {
	519	x38_remove_one(mci_pdev);
	520	pci_dev_put(mci_pdev);
	521	}
	522	}
	523
	524	module_init(x38_init);
	525	module_exit(x38_exit);
	526
	527	MODULE_LICENSE("GPL");
	528	MODULE_AUTHOR("Cluster Computing, Inc. Hitoshi Mitake");
	529	MODULE_DESCRIPTION("MC support for Intel X38 memory hub controllers");
	530
	531	module_param(edac_op_state, int, 0444);
	532	MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");