[linux-2.6] / drivers / edac / i82443bxgx_edac.c

/*
 * Intel 82443BX/GX (440BX/GX chipset) Memory Controller EDAC kernel
 * module (C) 2006 Tim Small
 *
 * 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 Linux
 * Networx, Thayne Harbaugh, Dan Hollis <goemon at anime dot net> and
 * others.
 *
 * 440GX fix by Jason Uhlenkott <juhlenko@akamai.com>.
 *
 * Written with reference to 82443BX Host Bridge Datasheet:
 * http://www.intel.com/design/chipsets/440/documentation.htm
 * references to this document given in [].
 *
 * This module doesn't support the 440LX, but it may be possible to
 * make it do so (the 440LX's register definitions are different, but
 * not completely so - I haven't studied them in enough detail to know
 * how easy this would be).
 */

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

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

#include <linux/slab.h>

#include "edac_core.h"

#define I82443_REVISION	"0.1"

#define EDAC_MOD_STR    "i82443bxgx_edac"

/* The 82443BX supports SDRAM, or EDO (EDO for mobile only), "Memory
 * Size: 8 MB to 512 MB (1GB with Registered DIMMs) with eight memory
 * rows" "The 82443BX supports multiple-bit error detection and
 * single-bit error correction when ECC mode is enabled and
 * single/multi-bit error detection when correction is disabled.
 * During writes to the DRAM, the 82443BX generates ECC for the data
 * on a QWord basis. Partial QWord writes require a read-modify-write
 * cycle when ECC is enabled."
*/

/* "Additionally, the 82443BX ensures that the data is corrected in
 * main memory so that accumulation of errors is prevented. Another
 * error within the same QWord would result in a double-bit error
 * which is unrecoverable. This is known as hardware scrubbing since
 * it requires no software intervention to correct the data in memory."
 */

/* [Also see page 100 (section 4.3), "DRAM Interface"]
 * [Also see page 112 (section 4.6.1.4), ECC]
 */

#define I82443BXGX_NR_CSROWS 8
#define I82443BXGX_NR_CHANS  1
#define I82443BXGX_NR_DIMMS  4

/* 82443 PCI Device 0 */
#define I82443BXGX_NBXCFG 0x50	/* 32bit register starting at this PCI
				 * config space offset */
#define I82443BXGX_NBXCFG_OFFSET_NON_ECCROW 24	/* Array of bits, zero if
						 * row is non-ECC */
#define I82443BXGX_NBXCFG_OFFSET_DRAM_FREQ 12	/* 2 bits,00=100MHz,10=66 MHz */

#define I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY 7	/* 2 bits:       */
#define I82443BXGX_NBXCFG_INTEGRITY_NONE   0x0	/* 00 = Non-ECC */
#define I82443BXGX_NBXCFG_INTEGRITY_EC     0x1	/* 01 = EC (only) */
#define I82443BXGX_NBXCFG_INTEGRITY_ECC    0x2	/* 10 = ECC */
#define I82443BXGX_NBXCFG_INTEGRITY_SCRUB  0x3	/* 11 = ECC + HW Scrub */

#define I82443BXGX_NBXCFG_OFFSET_ECC_DIAG_ENABLE  6

/* 82443 PCI Device 0 */
#define I82443BXGX_EAP   0x80	/* 32bit register starting at this PCI
				 * config space offset, Error Address
				 * Pointer Register */
#define I82443BXGX_EAP_OFFSET_EAP  12	/* High 20 bits of error address */
#define I82443BXGX_EAP_OFFSET_MBE  BIT(1)	/* Err at EAP was multi-bit (W1TC) */
#define I82443BXGX_EAP_OFFSET_SBE  BIT(0)	/* Err at EAP was single-bit (W1TC) */

#define I82443BXGX_ERRCMD  0x90	/* 8bit register starting at this PCI
				 * config space offset. */
#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_MBE BIT(1)	/* 1 = enable */
#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_SBE BIT(0)	/* 1 = enable */

#define I82443BXGX_ERRSTS  0x91	/* 16bit register starting at this PCI
				 * config space offset. */
#define I82443BXGX_ERRSTS_OFFSET_MBFRE 5	/* 3 bits - first err row multibit */
#define I82443BXGX_ERRSTS_OFFSET_MEF   BIT(4)	/* 1 = MBE occurred */
#define I82443BXGX_ERRSTS_OFFSET_SBFRE 1	/* 3 bits - first err row singlebit */
#define I82443BXGX_ERRSTS_OFFSET_SEF   BIT(0)	/* 1 = SBE occurred */

#define I82443BXGX_DRAMC 0x57	/* 8bit register starting at this PCI
				 * config space offset. */
#define I82443BXGX_DRAMC_OFFSET_DT 3	/* 2 bits, DRAM Type */
#define I82443BXGX_DRAMC_DRAM_IS_EDO 0	/* 00 = EDO */
#define I82443BXGX_DRAMC_DRAM_IS_SDRAM 1	/* 01 = SDRAM */
#define I82443BXGX_DRAMC_DRAM_IS_RSDRAM 2	/* 10 = Registered SDRAM */

#define I82443BXGX_DRB 0x60	/* 8x 8bit registers starting at this PCI
				 * config space offset. */

/* FIXME - don't poll when ECC disabled? */

struct i82443bxgx_edacmc_error_info {
	u32 eap;
};

static struct edac_pci_ctl_info *i82443bxgx_pci;

static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
				struct i82443bxgx_edacmc_error_info
				*info)
{
	struct pci_dev *pdev;
	pdev = to_pci_dev(mci->dev);
	pci_read_config_dword(pdev, I82443BXGX_EAP, &info->eap);
	if (info->eap & I82443BXGX_EAP_OFFSET_SBE)
		/* Clear error to allow next error to be reported [p.61] */
		pci_write_bits32(pdev, I82443BXGX_EAP,
				 I82443BXGX_EAP_OFFSET_SBE,
				 I82443BXGX_EAP_OFFSET_SBE);

	if (info->eap & I82443BXGX_EAP_OFFSET_MBE)
		/* Clear error to allow next error to be reported [p.61] */
		pci_write_bits32(pdev, I82443BXGX_EAP,
				 I82443BXGX_EAP_OFFSET_MBE,
				 I82443BXGX_EAP_OFFSET_MBE);
}

static int i82443bxgx_edacmc_process_error_info(struct mem_ctl_info *mci,
						struct
						i82443bxgx_edacmc_error_info
						*info, int handle_errors)
{
	int error_found = 0;
	u32 eapaddr, page, pageoffset;

	/* bits 30:12 hold the 4kb block in which the error occurred
	 * [p.61] */
	eapaddr = (info->eap & 0xfffff000);
	page = eapaddr >> PAGE_SHIFT;
	pageoffset = eapaddr - (page << PAGE_SHIFT);

	if (info->eap & I82443BXGX_EAP_OFFSET_SBE) {
		error_found = 1;
		if (handle_errors)
			edac_mc_handle_ce(mci, page, pageoffset,
				/* 440BX/GX don't make syndrome information
				 * available */
				0, edac_mc_find_csrow_by_page(mci, page), 0,
				mci->ctl_name);
	}

	if (info->eap & I82443BXGX_EAP_OFFSET_MBE) {
		error_found = 1;
		if (handle_errors)
			edac_mc_handle_ue(mci, page, pageoffset,
					edac_mc_find_csrow_by_page(mci, page),
					mci->ctl_name);
	}

	return error_found;
}

static void i82443bxgx_edacmc_check(struct mem_ctl_info *mci)
{
	struct i82443bxgx_edacmc_error_info info;

	debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
	i82443bxgx_edacmc_get_error_info(mci, &info);
	i82443bxgx_edacmc_process_error_info(mci, &info, 1);
}

static void i82443bxgx_init_csrows(struct mem_ctl_info *mci,
				struct pci_dev *pdev,
				enum edac_type edac_mode,
				enum mem_type mtype)
{
	struct csrow_info *csrow;
	int index;
	u8 drbar, dramc;
	u32 row_base, row_high_limit, row_high_limit_last;

	pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
	row_high_limit_last = 0;
	for (index = 0; index < mci->nr_csrows; index++) {
		csrow = &mci->csrows[index];
		pci_read_config_byte(pdev, I82443BXGX_DRB + index, &drbar);
		debugf1("MC%d: " __FILE__ ": %s() Row=%d DRB = %#0x\n",
			mci->mc_idx, __func__, index, drbar);
		row_high_limit = ((u32) drbar << 23);
		/* find the DRAM Chip Select Base address and mask */
		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);

		/* 440GX goes to 2GB, represented with a DRB of 0. */
		if (row_high_limit_last && !row_high_limit)
			row_high_limit = 1UL << 31;

		/* This row is empty [p.49] */
		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;
		/* EAP reports in 4kilobyte granularity [61] */
		csrow->grain = 1 << 12;
		csrow->mtype = mtype;
		/* I don't think 440BX can tell you device type? FIXME? */
		csrow->dtype = DEV_UNKNOWN;
		/* Mode is global to all rows on 440BX */
		csrow->edac_mode = edac_mode;
		row_high_limit_last = row_high_limit;
	}
}

static int i82443bxgx_edacmc_probe1(struct pci_dev *pdev, int dev_idx)
{
	struct mem_ctl_info *mci;
	u8 dramc;
	u32 nbxcfg, ecc_mode;
	enum mem_type mtype;
	enum edac_type edac_mode;

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

	/* Something is really hosed if PCI config space reads from
	 * the MC aren't working.
	 */
	if (pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg))
		return -EIO;

	mci = edac_mc_alloc(0, I82443BXGX_NR_CSROWS, I82443BXGX_NR_CHANS, 0);

	if (mci == NULL)
		return -ENOMEM;

	debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci);
	mci->dev = &pdev->dev;
	mci->mtype_cap = MEM_FLAG_EDO | MEM_FLAG_SDR | MEM_FLAG_RDR;
	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
	pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
	switch ((dramc >> I82443BXGX_DRAMC_OFFSET_DT) & (BIT(0) | BIT(1))) {
	case I82443BXGX_DRAMC_DRAM_IS_EDO:
		mtype = MEM_EDO;
		break;
	case I82443BXGX_DRAMC_DRAM_IS_SDRAM:
		mtype = MEM_SDR;
		break;
	case I82443BXGX_DRAMC_DRAM_IS_RSDRAM:
		mtype = MEM_RDR;
		break;
	default:
		debugf0("Unknown/reserved DRAM type value "
			"in DRAMC register!\n");
		mtype = -MEM_UNKNOWN;
	}

	if ((mtype == MEM_SDR) || (mtype == MEM_RDR))
		mci->edac_cap = mci->edac_ctl_cap;
	else
		mci->edac_cap = EDAC_FLAG_NONE;

	mci->scrub_cap = SCRUB_FLAG_HW_SRC;
	pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg);
	ecc_mode = ((nbxcfg >> I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY) &
		(BIT(0) | BIT(1)));

	mci->scrub_mode = (ecc_mode == I82443BXGX_NBXCFG_INTEGRITY_SCRUB)
		? SCRUB_HW_SRC : SCRUB_NONE;

	switch (ecc_mode) {
	case I82443BXGX_NBXCFG_INTEGRITY_NONE:
		edac_mode = EDAC_NONE;
		break;
	case I82443BXGX_NBXCFG_INTEGRITY_EC:
		edac_mode = EDAC_EC;
		break;
	case I82443BXGX_NBXCFG_INTEGRITY_ECC:
	case I82443BXGX_NBXCFG_INTEGRITY_SCRUB:
		edac_mode = EDAC_SECDED;
		break;
	default:
		debugf0("%s(): Unknown/reserved ECC state "
			"in NBXCFG register!\n", __func__);
		edac_mode = EDAC_UNKNOWN;
		break;
	}

	i82443bxgx_init_csrows(mci, pdev, edac_mode, mtype);

	/* Many BIOSes don't clear error flags on boot, so do this
	 * here, or we get "phantom" errors occuring at module-load
	 * time. */
	pci_write_bits32(pdev, I82443BXGX_EAP,
			(I82443BXGX_EAP_OFFSET_SBE |
				I82443BXGX_EAP_OFFSET_MBE),
			(I82443BXGX_EAP_OFFSET_SBE |
				I82443BXGX_EAP_OFFSET_MBE));

	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = I82443_REVISION;
	mci->ctl_name = "I82443BXGX";
	mci->dev_name = pci_name(pdev);
	mci->edac_check = i82443bxgx_edacmc_check;
	mci->ctl_page_to_phys = NULL;

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

	/* allocating generic PCI control info */
	i82443bxgx_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
	if (!i82443bxgx_pci) {
		printk(KERN_WARNING
			"%s(): Unable to create PCI control\n",
			__func__);
		printk(KERN_WARNING
			"%s(): PCI error report via EDAC not setup\n",
			__func__);
	}

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

fail:
	edac_mc_free(mci);
	return -ENODEV;
}

EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_probe1);

/* returns count (>= 0), or negative on error */
static int __devinit i82443bxgx_edacmc_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 i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
}

static void __devexit i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
{
	struct mem_ctl_info *mci;

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

	if (i82443bxgx_pci)
		edac_pci_release_generic_ctl(i82443bxgx_pci);

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

	edac_mc_free(mci);
}

EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_remove_one);

static const struct pci_device_id i82443bxgx_pci_tbl[] __devinitdata = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_2)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2)},
	{0,}			/* 0 terminated list. */
};

MODULE_DEVICE_TABLE(pci, i82443bxgx_pci_tbl);

static struct pci_driver i82443bxgx_edacmc_driver = {
	.name = EDAC_MOD_STR,
	.probe = i82443bxgx_edacmc_init_one,
	.remove = __devexit_p(i82443bxgx_edacmc_remove_one),
	.id_table = i82443bxgx_pci_tbl,
};

static int __init i82443bxgx_edacmc_init(void)
{
	return pci_register_driver(&i82443bxgx_edacmc_driver);
}

static void __exit i82443bxgx_edacmc_exit(void)
{
	pci_unregister_driver(&i82443bxgx_edacmc_driver);
}

module_init(i82443bxgx_edacmc_init);
module_exit(i82443bxgx_edacmc_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD");
MODULE_DESCRIPTION("EDAC MC support for Intel 82443BX/GX memory controllers");
Commit	Line	Data
5a2c675c TS	1	/*
	2	* Intel 82443BX/GX (440BX/GX chipset) Memory Controller EDAC kernel
	3	* module (C) 2006 Tim Small
	4	*
	5	* This file may be distributed under the terms of the GNU General
	6	* Public License.
	7	*
	8	* Written by Tim Small <tim@buttersideup.com>, based on work by Linux
	9	* Networx, Thayne Harbaugh, Dan Hollis <goemon at anime dot net> and
	10	* others.
	11	*
	12	* 440GX fix by Jason Uhlenkott <juhlenko@akamai.com>.
	13	*
	14	* Written with reference to 82443BX Host Bridge Datasheet:
	15	* http://www.intel.com/design/chipsets/440/documentation.htm
	16	* references to this document given in [].
	17	*
	18	* This module doesn't support the 440LX, but it may be possible to
	19	* make it do so (the 440LX's register definitions are different, but
	20	* not completely so - I haven't studied them in enough detail to know
	21	* how easy this would be).
	22	*/
	23
	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26
	27	#include <linux/pci.h>
	28	#include <linux/pci_ids.h>
	29
	30	#include <linux/slab.h>
	31
20bcb7a8	32	#include "edac_core.h"
5a2c675c TS	33
	34	#define I82443_REVISION "0.1"
	35
	36	#define EDAC_MOD_STR "i82443bxgx_edac"
	37
5a2c675c TS	38	/* The 82443BX supports SDRAM, or EDO (EDO for mobile only), "Memory
	39	* Size: 8 MB to 512 MB (1GB with Registered DIMMs) with eight memory
	40	* rows" "The 82443BX supports multiple-bit error detection and
	41	* single-bit error correction when ECC mode is enabled and
	42	* single/multi-bit error detection when correction is disabled.
	43	* During writes to the DRAM, the 82443BX generates ECC for the data
	44	* on a QWord basis. Partial QWord writes require a read-modify-write
	45	* cycle when ECC is enabled."
	46	*/
	47
	48	/* "Additionally, the 82443BX ensures that the data is corrected in
	49	* main memory so that accumulation of errors is prevented. Another
	50	* error within the same QWord would result in a double-bit error
	51	* which is unrecoverable. This is known as hardware scrubbing since
	52	* it requires no software intervention to correct the data in memory."
	53	*/
	54
	55	/* [Also see page 100 (section 4.3), "DRAM Interface"]
	56	* [Also see page 112 (section 4.6.1.4), ECC]
	57	*/
	58
	59	#define I82443BXGX_NR_CSROWS 8
	60	#define I82443BXGX_NR_CHANS 1
	61	#define I82443BXGX_NR_DIMMS 4
	62
5a2c675c	63	/* 82443 PCI Device 0 */
11116601 DT	64	#define I82443BXGX_NBXCFG 0x50 /* 32bit register starting at this PCI
	65	* config space offset */
	66	#define I82443BXGX_NBXCFG_OFFSET_NON_ECCROW 24 /* Array of bits, zero if
	67	* row is non-ECC */
	68	#define I82443BXGX_NBXCFG_OFFSET_DRAM_FREQ 12 /* 2 bits,00=100MHz,10=66 MHz */
	69
	70	#define I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY 7 /* 2 bits: */
	71	#define I82443BXGX_NBXCFG_INTEGRITY_NONE 0x0 /* 00 = Non-ECC */
	72	#define I82443BXGX_NBXCFG_INTEGRITY_EC 0x1 /* 01 = EC (only) */
	73	#define I82443BXGX_NBXCFG_INTEGRITY_ECC 0x2 /* 10 = ECC */
	74	#define I82443BXGX_NBXCFG_INTEGRITY_SCRUB 0x3 /* 11 = ECC + HW Scrub */
5a2c675c TS	75
	76	#define I82443BXGX_NBXCFG_OFFSET_ECC_DIAG_ENABLE 6
	77
5a2c675c	78	/* 82443 PCI Device 0 */
11116601 DT	79	#define I82443BXGX_EAP 0x80 /* 32bit register starting at this PCI
	80	* config space offset, Error Address
	81	* Pointer Register */
	82	#define I82443BXGX_EAP_OFFSET_EAP 12 /* High 20 bits of error address */
	83	#define I82443BXGX_EAP_OFFSET_MBE BIT(1) /* Err at EAP was multi-bit (W1TC) */
	84	#define I82443BXGX_EAP_OFFSET_SBE BIT(0) /* Err at EAP was single-bit (W1TC) */
	85
	86	#define I82443BXGX_ERRCMD 0x90 /* 8bit register starting at this PCI
5a2c675c	87	* config space offset. */
11116601 DT	88	#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_MBE BIT(1) /* 1 = enable */
11116601 DT	89	#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_SBE BIT(0) /* 1 = enable */
5a2c675c	90
11116601	91	#define I82443BXGX_ERRSTS 0x91 /* 16bit register starting at this PCI
5a2c675c	92	* config space offset. */
11116601 DT	93	#define I82443BXGX_ERRSTS_OFFSET_MBFRE 5 /* 3 bits - first err row multibit */
	94	#define I82443BXGX_ERRSTS_OFFSET_MEF BIT(4) /* 1 = MBE occurred */
	95	#define I82443BXGX_ERRSTS_OFFSET_SBFRE 1 /* 3 bits - first err row singlebit */
	96	#define I82443BXGX_ERRSTS_OFFSET_SEF BIT(0) /* 1 = SBE occurred */
5a2c675c	97
11116601 DT	98	#define I82443BXGX_DRAMC 0x57 /* 8bit register starting at this PCI
	99	* config space offset. */
	100	#define I82443BXGX_DRAMC_OFFSET_DT 3 /* 2 bits, DRAM Type */
	101	#define I82443BXGX_DRAMC_DRAM_IS_EDO 0 /* 00 = EDO */
5a2c675c	102	#define I82443BXGX_DRAMC_DRAM_IS_SDRAM 1 /* 01 = SDRAM */
11116601	103	#define I82443BXGX_DRAMC_DRAM_IS_RSDRAM 2 /* 10 = Registered SDRAM */
5a2c675c	104
11116601 DT	105	#define I82443BXGX_DRB 0x60 /* 8x 8bit registers starting at this PCI
11116601 DT	106	* config space offset. */
5a2c675c TS	107
	108	/* FIXME - don't poll when ECC disabled? */
	109
5a2c675c TS	110	struct i82443bxgx_edacmc_error_info {
	111	u32 eap;
	112	};
	113
456a2f95 DJ	114	static struct edac_pci_ctl_info *i82443bxgx_pci;
456a2f95 DJ	115
11116601	116	static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
052dfb45 DT	117	struct i82443bxgx_edacmc_error_info
052dfb45 DT	118	*info)
5a2c675c TS	119	{
	120	struct pci_dev *pdev;
	121	pdev = to_pci_dev(mci->dev);
	122	pci_read_config_dword(pdev, I82443BXGX_EAP, &info->eap);
	123	if (info->eap & I82443BXGX_EAP_OFFSET_SBE)
	124	/* Clear error to allow next error to be reported [p.61] */
	125	pci_write_bits32(pdev, I82443BXGX_EAP,
	126	I82443BXGX_EAP_OFFSET_SBE,
	127	I82443BXGX_EAP_OFFSET_SBE);
	128
	129	if (info->eap & I82443BXGX_EAP_OFFSET_MBE)
	130	/* Clear error to allow next error to be reported [p.61] */
	131	pci_write_bits32(pdev, I82443BXGX_EAP,
	132	I82443BXGX_EAP_OFFSET_MBE,
	133	I82443BXGX_EAP_OFFSET_MBE);
	134	}
	135
11116601 DT	136	static int i82443bxgx_edacmc_process_error_info(struct mem_ctl_info *mci,
	137	struct
	138	i82443bxgx_edacmc_error_info
	139	*info, int handle_errors)
5a2c675c TS	140	{
	141	int error_found = 0;
	142	u32 eapaddr, page, pageoffset;
	143
	144	/* bits 30:12 hold the 4kb block in which the error occurred
	145	* [p.61] */
	146	eapaddr = (info->eap & 0xfffff000);
	147	page = eapaddr >> PAGE_SHIFT;
	148	pageoffset = eapaddr - (page << PAGE_SHIFT);
	149
11116601	150	if (info->eap & I82443BXGX_EAP_OFFSET_SBE) {
5a2c675c TS	151	error_found = 1;
5a2c675c TS	152	if (handle_errors)
11116601	153	edac_mc_handle_ce(mci, page, pageoffset,
052dfb45 DT	154	/* 440BX/GX don't make syndrome information
	155	* available */
	156	0, edac_mc_find_csrow_by_page(mci, page), 0,
	157	mci->ctl_name);
5a2c675c TS	158	}
5a2c675c TS	159
11116601	160	if (info->eap & I82443BXGX_EAP_OFFSET_MBE) {
5a2c675c TS	161	error_found = 1;
5a2c675c TS	162	if (handle_errors)
11116601	163	edac_mc_handle_ue(mci, page, pageoffset,
052dfb45 DT	164	edac_mc_find_csrow_by_page(mci, page),
052dfb45 DT	165	mci->ctl_name);
5a2c675c TS	166	}
	167
	168	return error_found;
	169	}
	170
5a2c675c TS	171	static void i82443bxgx_edacmc_check(struct mem_ctl_info *mci)
	172	{
	173	struct i82443bxgx_edacmc_error_info info;
	174
	175	debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
	176	i82443bxgx_edacmc_get_error_info(mci, &info);
	177	i82443bxgx_edacmc_process_error_info(mci, &info, 1);
	178	}
	179
5a2c675c	180	static void i82443bxgx_init_csrows(struct mem_ctl_info *mci,
052dfb45 DT	181	struct pci_dev *pdev,
	182	enum edac_type edac_mode,
	183	enum mem_type mtype)
5a2c675c TS	184	{
	185	struct csrow_info *csrow;
	186	int index;
	187	u8 drbar, dramc;
	188	u32 row_base, row_high_limit, row_high_limit_last;
	189
	190	pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
	191	row_high_limit_last = 0;
	192	for (index = 0; index < mci->nr_csrows; index++) {
	193	csrow = &mci->csrows[index];
	194	pci_read_config_byte(pdev, I82443BXGX_DRB + index, &drbar);
	195	debugf1("MC%d: " __FILE__ ": %s() Row=%d DRB = %#0x\n",
	196	mci->mc_idx, __func__, index, drbar);
	197	row_high_limit = ((u32) drbar << 23);
	198	/* find the DRAM Chip Select Base address and mask */
	199	debugf1("MC%d: " __FILE__ ": %s() Row=%d, "
	200	"Boundry Address=%#0x, Last = %#0x \n",
	201	mci->mc_idx, __func__, index, row_high_limit,
	202	row_high_limit_last);
	203
	204	/* 440GX goes to 2GB, represented with a DRB of 0. */
	205	if (row_high_limit_last && !row_high_limit)
	206	row_high_limit = 1UL << 31;
	207
	208	/* This row is empty [p.49] */
	209	if (row_high_limit == row_high_limit_last)
	210	continue;
	211	row_base = row_high_limit_last;
	212	csrow->first_page = row_base >> PAGE_SHIFT;
	213	csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
	214	csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
	215	/* EAP reports in 4kilobyte granularity [61] */
	216	csrow->grain = 1 << 12;
	217	csrow->mtype = mtype;
	218	/* I don't think 440BX can tell you device type? FIXME? */
	219	csrow->dtype = DEV_UNKNOWN;
	220	/* Mode is global to all rows on 440BX */
	221	csrow->edac_mode = edac_mode;
	222	row_high_limit_last = row_high_limit;
	223	}
	224	}
	225
11116601	226	static int i82443bxgx_edacmc_probe1(struct pci_dev *pdev, int dev_idx)
5a2c675c TS	227	{
	228	struct mem_ctl_info *mci;
	229	u8 dramc;
	230	u32 nbxcfg, ecc_mode;
	231	enum mem_type mtype;
	232	enum edac_type edac_mode;
	233
	234	debugf0("MC: " __FILE__ ": %s()\n", __func__);
	235
	236	/* Something is really hosed if PCI config space reads from
052dfb45 DT	237	* the MC aren't working.
052dfb45 DT	238	*/
5a2c675c TS	239	if (pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg))
	240	return -EIO;
	241
b8f6f975	242	mci = edac_mc_alloc(0, I82443BXGX_NR_CSROWS, I82443BXGX_NR_CHANS, 0);
5a2c675c TS	243
	244	if (mci == NULL)
	245	return -ENOMEM;
	246
	247	debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci);
	248	mci->dev = &pdev->dev;
	249	mci->mtype_cap = MEM_FLAG_EDO \| MEM_FLAG_SDR \| MEM_FLAG_RDR;
	250	mci->edac_ctl_cap = EDAC_FLAG_NONE \| EDAC_FLAG_EC \| EDAC_FLAG_SECDED;
	251	pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
	252	switch ((dramc >> I82443BXGX_DRAMC_OFFSET_DT) & (BIT(0) \| BIT(1))) {
11116601	253	case I82443BXGX_DRAMC_DRAM_IS_EDO:
5a2c675c TS	254	mtype = MEM_EDO;
	255	break;
	256	case I82443BXGX_DRAMC_DRAM_IS_SDRAM:
	257	mtype = MEM_SDR;
	258	break;
	259	case I82443BXGX_DRAMC_DRAM_IS_RSDRAM:
	260	mtype = MEM_RDR;
	261	break;
	262	default:
052dfb45 DT	263	debugf0("Unknown/reserved DRAM type value "
052dfb45 DT	264	"in DRAMC register!\n");
5a2c675c TS	265	mtype = -MEM_UNKNOWN;
	266	}
	267
	268	if ((mtype == MEM_SDR) \|\| (mtype == MEM_RDR))
	269	mci->edac_cap = mci->edac_ctl_cap;
	270	else
	271	mci->edac_cap = EDAC_FLAG_NONE;
	272
	273	mci->scrub_cap = SCRUB_FLAG_HW_SRC;
	274	pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg);
	275	ecc_mode = ((nbxcfg >> I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY) &
052dfb45	276	(BIT(0) \| BIT(1)));
5a2c675c TS	277
5a2c675c TS	278	mci->scrub_mode = (ecc_mode == I82443BXGX_NBXCFG_INTEGRITY_SCRUB)
052dfb45	279	? SCRUB_HW_SRC : SCRUB_NONE;
5a2c675c	280
11116601	281	switch (ecc_mode) {
5a2c675c TS	282	case I82443BXGX_NBXCFG_INTEGRITY_NONE:
	283	edac_mode = EDAC_NONE;
	284	break;
	285	case I82443BXGX_NBXCFG_INTEGRITY_EC:
	286	edac_mode = EDAC_EC;
	287	break;
	288	case I82443BXGX_NBXCFG_INTEGRITY_ECC:
	289	case I82443BXGX_NBXCFG_INTEGRITY_SCRUB:
	290	edac_mode = EDAC_SECDED;
	291	break;
	292	default:
052dfb45 DT	293	debugf0("%s(): Unknown/reserved ECC state "
052dfb45 DT	294	"in NBXCFG register!\n", __func__);
5a2c675c TS	295	edac_mode = EDAC_UNKNOWN;
	296	break;
	297	}
	298
	299	i82443bxgx_init_csrows(mci, pdev, edac_mode, mtype);
	300
	301	/* Many BIOSes don't clear error flags on boot, so do this
	302	* here, or we get "phantom" errors occuring at module-load
	303	* time. */
	304	pci_write_bits32(pdev, I82443BXGX_EAP,
052dfb45 DT	305	(I82443BXGX_EAP_OFFSET_SBE \|
	306	I82443BXGX_EAP_OFFSET_MBE),
	307	(I82443BXGX_EAP_OFFSET_SBE \|
	308	I82443BXGX_EAP_OFFSET_MBE));
5a2c675c TS	309
	310	mci->mod_name = EDAC_MOD_STR;
	311	mci->mod_ver = I82443_REVISION;
	312	mci->ctl_name = "I82443BXGX";
c4192705	313	mci->dev_name = pci_name(pdev);
5a2c675c TS	314	mci->edac_check = i82443bxgx_edacmc_check;
	315	mci->ctl_page_to_phys = NULL;
	316
b8f6f975	317	if (edac_mc_add_mc(mci)) {
5a2c675c TS	318	debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
	319	goto fail;
	320	}
	321
456a2f95 DJ	322	/* allocating generic PCI control info */
	323	i82443bxgx_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
	324	if (!i82443bxgx_pci) {
	325	printk(KERN_WARNING
	326	"%s(): Unable to create PCI control\n",
	327	__func__);
	328	printk(KERN_WARNING
	329	"%s(): PCI error report via EDAC not setup\n",
	330	__func__);
	331	}
	332
5a2c675c TS	333	debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
	334	return 0;
	335
052dfb45	336	fail:
5a2c675c TS	337	edac_mc_free(mci);
	338	return -ENODEV;
	339	}
11116601	340
5a2c675c TS	341	EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_probe1);
	342
	343	/* returns count (>= 0), or negative on error */
	344	static int __devinit i82443bxgx_edacmc_init_one(struct pci_dev *pdev,
11116601	345	const struct pci_device_id *ent)
5a2c675c TS	346	{
	347	debugf0("MC: " __FILE__ ": %s()\n", __func__);
	348
	349	/* don't need to call pci_device_enable() */
11116601	350	return i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
5a2c675c TS	351	}
5a2c675c TS	352
5a2c675c TS	353	static void __devexit i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
	354	{
	355	struct mem_ctl_info *mci;
	356
	357	debugf0(__FILE__ ": %s()\n", __func__);
	358
456a2f95 DJ	359	if (i82443bxgx_pci)
	360	edac_pci_release_generic_ctl(i82443bxgx_pci);
	361
11116601	362	if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
5a2c675c TS	363	return;
	364
	365	edac_mc_free(mci);
	366	}
5a2c675c	367
11116601	368	EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_remove_one);
5a2c675c TS	369
	370	static const struct pci_device_id i82443bxgx_pci_tbl[] __devinitdata = {
	371	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_0)},
	372	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_2)},
	373	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0)},
	374	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2)},
	375	{0,} /* 0 terminated list. */
	376	};
	377
	378	MODULE_DEVICE_TABLE(pci, i82443bxgx_pci_tbl);
	379
5a2c675c TS	380	static struct pci_driver i82443bxgx_edacmc_driver = {
	381	.name = EDAC_MOD_STR,
	382	.probe = i82443bxgx_edacmc_init_one,
	383	.remove = __devexit_p(i82443bxgx_edacmc_remove_one),
	384	.id_table = i82443bxgx_pci_tbl,
	385	};
	386
5a2c675c TS	387	static int __init i82443bxgx_edacmc_init(void)
	388	{
	389	return pci_register_driver(&i82443bxgx_edacmc_driver);
	390	}
	391
5a2c675c TS	392	static void __exit i82443bxgx_edacmc_exit(void)
	393	{
	394	pci_unregister_driver(&i82443bxgx_edacmc_driver);
	395	}
	396
5a2c675c TS	397	module_init(i82443bxgx_edacmc_init);
	398	module_exit(i82443bxgx_edacmc_exit);
	399
5a2c675c TS	400	MODULE_LICENSE("GPL");
	401	MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD");
	402	MODULE_DESCRIPTION("EDAC MC support for Intel 82443BX/GX memory controllers");