2007-07-19 04:49:42 -04:00
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/*
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* Intel 82443BX/GX (440BX/GX chipset) Memory Controller EDAC kernel
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* module (C) 2006 Tim Small
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*
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* This file may be distributed under the terms of the GNU General
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* Public License.
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*
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* Written by Tim Small <tim@buttersideup.com>, based on work by Linux
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* Networx, Thayne Harbaugh, Dan Hollis <goemon at anime dot net> and
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* others.
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*
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* 440GX fix by Jason Uhlenkott <juhlenko@akamai.com>.
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*
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* Written with reference to 82443BX Host Bridge Datasheet:
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* http://www.intel.com/design/chipsets/440/documentation.htm
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* references to this document given in [].
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*
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* This module doesn't support the 440LX, but it may be possible to
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* make it do so (the 440LX's register definitions are different, but
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* not completely so - I haven't studied them in enough detail to know
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* how easy this would be).
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/slab.h>
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2008-04-29 04:03:18 -04:00
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#include <linux/edac.h>
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2007-07-19 04:49:47 -04:00
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#include "edac_core.h"
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2007-07-19 04:49:42 -04:00
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#define I82443_REVISION "0.1"
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#define EDAC_MOD_STR "i82443bxgx_edac"
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/* The 82443BX supports SDRAM, or EDO (EDO for mobile only), "Memory
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* Size: 8 MB to 512 MB (1GB with Registered DIMMs) with eight memory
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* rows" "The 82443BX supports multiple-bit error detection and
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* single-bit error correction when ECC mode is enabled and
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* single/multi-bit error detection when correction is disabled.
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* During writes to the DRAM, the 82443BX generates ECC for the data
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* on a QWord basis. Partial QWord writes require a read-modify-write
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* cycle when ECC is enabled."
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*/
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/* "Additionally, the 82443BX ensures that the data is corrected in
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* main memory so that accumulation of errors is prevented. Another
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* error within the same QWord would result in a double-bit error
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* which is unrecoverable. This is known as hardware scrubbing since
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* it requires no software intervention to correct the data in memory."
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*/
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/* [Also see page 100 (section 4.3), "DRAM Interface"]
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* [Also see page 112 (section 4.6.1.4), ECC]
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*/
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#define I82443BXGX_NR_CSROWS 8
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#define I82443BXGX_NR_CHANS 1
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#define I82443BXGX_NR_DIMMS 4
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/* 82443 PCI Device 0 */
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_NBXCFG 0x50 /* 32bit register starting at this PCI
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* config space offset */
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#define I82443BXGX_NBXCFG_OFFSET_NON_ECCROW 24 /* Array of bits, zero if
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* row is non-ECC */
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#define I82443BXGX_NBXCFG_OFFSET_DRAM_FREQ 12 /* 2 bits,00=100MHz,10=66 MHz */
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#define I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY 7 /* 2 bits: */
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#define I82443BXGX_NBXCFG_INTEGRITY_NONE 0x0 /* 00 = Non-ECC */
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#define I82443BXGX_NBXCFG_INTEGRITY_EC 0x1 /* 01 = EC (only) */
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#define I82443BXGX_NBXCFG_INTEGRITY_ECC 0x2 /* 10 = ECC */
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#define I82443BXGX_NBXCFG_INTEGRITY_SCRUB 0x3 /* 11 = ECC + HW Scrub */
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2007-07-19 04:49:42 -04:00
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#define I82443BXGX_NBXCFG_OFFSET_ECC_DIAG_ENABLE 6
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/* 82443 PCI Device 0 */
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_EAP 0x80 /* 32bit register starting at this PCI
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* config space offset, Error Address
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* Pointer Register */
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#define I82443BXGX_EAP_OFFSET_EAP 12 /* High 20 bits of error address */
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#define I82443BXGX_EAP_OFFSET_MBE BIT(1) /* Err at EAP was multi-bit (W1TC) */
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#define I82443BXGX_EAP_OFFSET_SBE BIT(0) /* Err at EAP was single-bit (W1TC) */
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#define I82443BXGX_ERRCMD 0x90 /* 8bit register starting at this PCI
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2007-07-19 04:49:42 -04:00
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* config space offset. */
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_MBE BIT(1) /* 1 = enable */
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#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_SBE BIT(0) /* 1 = enable */
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2007-07-19 04:49:42 -04:00
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_ERRSTS 0x91 /* 16bit register starting at this PCI
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2007-07-19 04:49:42 -04:00
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* config space offset. */
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_ERRSTS_OFFSET_MBFRE 5 /* 3 bits - first err row multibit */
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#define I82443BXGX_ERRSTS_OFFSET_MEF BIT(4) /* 1 = MBE occurred */
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#define I82443BXGX_ERRSTS_OFFSET_SBFRE 1 /* 3 bits - first err row singlebit */
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#define I82443BXGX_ERRSTS_OFFSET_SEF BIT(0) /* 1 = SBE occurred */
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2007-07-19 04:49:42 -04:00
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_DRAMC 0x57 /* 8bit register starting at this PCI
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* config space offset. */
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#define I82443BXGX_DRAMC_OFFSET_DT 3 /* 2 bits, DRAM Type */
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#define I82443BXGX_DRAMC_DRAM_IS_EDO 0 /* 00 = EDO */
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2007-07-19 04:49:42 -04:00
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#define I82443BXGX_DRAMC_DRAM_IS_SDRAM 1 /* 01 = SDRAM */
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_DRAMC_DRAM_IS_RSDRAM 2 /* 10 = Registered SDRAM */
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2007-07-19 04:49:42 -04:00
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2007-07-19 04:50:07 -04:00
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#define I82443BXGX_DRB 0x60 /* 8x 8bit registers starting at this PCI
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* config space offset. */
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2007-07-19 04:49:42 -04:00
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/* FIXME - don't poll when ECC disabled? */
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struct i82443bxgx_edacmc_error_info {
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u32 eap;
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};
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2007-07-19 04:50:10 -04:00
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static struct edac_pci_ctl_info *i82443bxgx_pci;
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2007-07-19 04:50:07 -04:00
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static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
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2007-07-19 04:50:13 -04:00
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struct i82443bxgx_edacmc_error_info
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*info)
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2007-07-19 04:49:42 -04:00
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{
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struct pci_dev *pdev;
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pdev = to_pci_dev(mci->dev);
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pci_read_config_dword(pdev, I82443BXGX_EAP, &info->eap);
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if (info->eap & I82443BXGX_EAP_OFFSET_SBE)
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/* Clear error to allow next error to be reported [p.61] */
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pci_write_bits32(pdev, I82443BXGX_EAP,
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I82443BXGX_EAP_OFFSET_SBE,
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I82443BXGX_EAP_OFFSET_SBE);
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if (info->eap & I82443BXGX_EAP_OFFSET_MBE)
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/* Clear error to allow next error to be reported [p.61] */
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pci_write_bits32(pdev, I82443BXGX_EAP,
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I82443BXGX_EAP_OFFSET_MBE,
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I82443BXGX_EAP_OFFSET_MBE);
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}
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2007-07-19 04:50:07 -04:00
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static int i82443bxgx_edacmc_process_error_info(struct mem_ctl_info *mci,
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struct
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i82443bxgx_edacmc_error_info
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*info, int handle_errors)
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2007-07-19 04:49:42 -04:00
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{
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int error_found = 0;
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u32 eapaddr, page, pageoffset;
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/* bits 30:12 hold the 4kb block in which the error occurred
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* [p.61] */
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eapaddr = (info->eap & 0xfffff000);
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page = eapaddr >> PAGE_SHIFT;
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pageoffset = eapaddr - (page << PAGE_SHIFT);
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2007-07-19 04:50:07 -04:00
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if (info->eap & I82443BXGX_EAP_OFFSET_SBE) {
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2007-07-19 04:49:42 -04:00
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error_found = 1;
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if (handle_errors)
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2007-07-19 04:50:07 -04:00
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edac_mc_handle_ce(mci, page, pageoffset,
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2007-07-19 04:50:13 -04:00
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/* 440BX/GX don't make syndrome information
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* available */
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0, edac_mc_find_csrow_by_page(mci, page), 0,
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mci->ctl_name);
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2007-07-19 04:49:42 -04:00
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}
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2007-07-19 04:50:07 -04:00
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if (info->eap & I82443BXGX_EAP_OFFSET_MBE) {
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2007-07-19 04:49:42 -04:00
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error_found = 1;
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if (handle_errors)
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2007-07-19 04:50:07 -04:00
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edac_mc_handle_ue(mci, page, pageoffset,
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2007-07-19 04:50:13 -04:00
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edac_mc_find_csrow_by_page(mci, page),
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mci->ctl_name);
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2007-07-19 04:49:42 -04:00
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}
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return error_found;
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}
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static void i82443bxgx_edacmc_check(struct mem_ctl_info *mci)
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{
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struct i82443bxgx_edacmc_error_info info;
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debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
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i82443bxgx_edacmc_get_error_info(mci, &info);
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i82443bxgx_edacmc_process_error_info(mci, &info, 1);
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}
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static void i82443bxgx_init_csrows(struct mem_ctl_info *mci,
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2007-07-19 04:50:13 -04:00
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struct pci_dev *pdev,
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enum edac_type edac_mode,
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enum mem_type mtype)
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2007-07-19 04:49:42 -04:00
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{
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struct csrow_info *csrow;
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int index;
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u8 drbar, dramc;
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u32 row_base, row_high_limit, row_high_limit_last;
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pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
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row_high_limit_last = 0;
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for (index = 0; index < mci->nr_csrows; index++) {
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csrow = &mci->csrows[index];
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pci_read_config_byte(pdev, I82443BXGX_DRB + index, &drbar);
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debugf1("MC%d: " __FILE__ ": %s() Row=%d DRB = %#0x\n",
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mci->mc_idx, __func__, index, drbar);
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row_high_limit = ((u32) drbar << 23);
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/* find the DRAM Chip Select Base address and mask */
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debugf1("MC%d: " __FILE__ ": %s() Row=%d, "
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"Boundry Address=%#0x, Last = %#0x \n",
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mci->mc_idx, __func__, index, row_high_limit,
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row_high_limit_last);
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/* 440GX goes to 2GB, represented with a DRB of 0. */
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if (row_high_limit_last && !row_high_limit)
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row_high_limit = 1UL << 31;
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/* This row is empty [p.49] */
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if (row_high_limit == row_high_limit_last)
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continue;
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row_base = row_high_limit_last;
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csrow->first_page = row_base >> PAGE_SHIFT;
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csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
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csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
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/* EAP reports in 4kilobyte granularity [61] */
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csrow->grain = 1 << 12;
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csrow->mtype = mtype;
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/* I don't think 440BX can tell you device type? FIXME? */
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csrow->dtype = DEV_UNKNOWN;
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/* Mode is global to all rows on 440BX */
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csrow->edac_mode = edac_mode;
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row_high_limit_last = row_high_limit;
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}
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}
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2007-07-19 04:50:07 -04:00
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static int i82443bxgx_edacmc_probe1(struct pci_dev *pdev, int dev_idx)
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2007-07-19 04:49:42 -04:00
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{
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struct mem_ctl_info *mci;
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u8 dramc;
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u32 nbxcfg, ecc_mode;
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enum mem_type mtype;
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enum edac_type edac_mode;
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debugf0("MC: " __FILE__ ": %s()\n", __func__);
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/* Something is really hosed if PCI config space reads from
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2007-07-19 04:50:13 -04:00
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* the MC aren't working.
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*/
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2007-07-19 04:49:42 -04:00
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if (pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg))
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return -EIO;
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2007-07-19 04:50:26 -04:00
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mci = edac_mc_alloc(0, I82443BXGX_NR_CSROWS, I82443BXGX_NR_CHANS, 0);
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2007-07-19 04:49:42 -04:00
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if (mci == NULL)
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return -ENOMEM;
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debugf0("MC: " __FILE__ ": %s(): mci = %p\n", __func__, mci);
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mci->dev = &pdev->dev;
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mci->mtype_cap = MEM_FLAG_EDO | MEM_FLAG_SDR | MEM_FLAG_RDR;
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mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
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pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
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switch ((dramc >> I82443BXGX_DRAMC_OFFSET_DT) & (BIT(0) | BIT(1))) {
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2007-07-19 04:50:07 -04:00
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case I82443BXGX_DRAMC_DRAM_IS_EDO:
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2007-07-19 04:49:42 -04:00
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mtype = MEM_EDO;
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break;
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case I82443BXGX_DRAMC_DRAM_IS_SDRAM:
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mtype = MEM_SDR;
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break;
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case I82443BXGX_DRAMC_DRAM_IS_RSDRAM:
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mtype = MEM_RDR;
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break;
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default:
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2007-07-19 04:50:13 -04:00
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debugf0("Unknown/reserved DRAM type value "
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"in DRAMC register!\n");
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2007-07-19 04:49:42 -04:00
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mtype = -MEM_UNKNOWN;
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}
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if ((mtype == MEM_SDR) || (mtype == MEM_RDR))
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mci->edac_cap = mci->edac_ctl_cap;
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else
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mci->edac_cap = EDAC_FLAG_NONE;
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mci->scrub_cap = SCRUB_FLAG_HW_SRC;
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pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg);
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ecc_mode = ((nbxcfg >> I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY) &
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2007-07-19 04:50:13 -04:00
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(BIT(0) | BIT(1)));
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2007-07-19 04:49:42 -04:00
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mci->scrub_mode = (ecc_mode == I82443BXGX_NBXCFG_INTEGRITY_SCRUB)
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2007-07-19 04:50:13 -04:00
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? SCRUB_HW_SRC : SCRUB_NONE;
|
2007-07-19 04:49:42 -04:00
|
|
|
|
2007-07-19 04:50:07 -04:00
|
|
|
switch (ecc_mode) {
|
2007-07-19 04:49:42 -04:00
|
|
|
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:
|
2007-07-19 04:50:13 -04:00
|
|
|
debugf0("%s(): Unknown/reserved ECC state "
|
|
|
|
"in NBXCFG register!\n", __func__);
|
2007-07-19 04:49:42 -04:00
|
|
|
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,
|
2007-07-19 04:50:13 -04:00
|
|
|
(I82443BXGX_EAP_OFFSET_SBE |
|
|
|
|
I82443BXGX_EAP_OFFSET_MBE),
|
|
|
|
(I82443BXGX_EAP_OFFSET_SBE |
|
|
|
|
I82443BXGX_EAP_OFFSET_MBE));
|
2007-07-19 04:49:42 -04:00
|
|
|
|
|
|
|
mci->mod_name = EDAC_MOD_STR;
|
|
|
|
mci->mod_ver = I82443_REVISION;
|
|
|
|
mci->ctl_name = "I82443BXGX";
|
2007-07-19 04:49:47 -04:00
|
|
|
mci->dev_name = pci_name(pdev);
|
2007-07-19 04:49:42 -04:00
|
|
|
mci->edac_check = i82443bxgx_edacmc_check;
|
|
|
|
mci->ctl_page_to_phys = NULL;
|
|
|
|
|
2007-07-19 04:50:26 -04:00
|
|
|
if (edac_mc_add_mc(mci)) {
|
2007-07-19 04:49:42 -04:00
|
|
|
debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2007-07-19 04:50:10 -04:00
|
|
|
/* 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__);
|
|
|
|
}
|
|
|
|
|
2007-07-19 04:49:42 -04:00
|
|
|
debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
|
|
|
|
return 0;
|
|
|
|
|
2007-07-19 04:50:13 -04:00
|
|
|
fail:
|
2007-07-19 04:49:42 -04:00
|
|
|
edac_mc_free(mci);
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
2007-07-19 04:50:07 -04:00
|
|
|
|
2007-07-19 04:49:42 -04:00
|
|
|
EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_probe1);
|
|
|
|
|
|
|
|
/* returns count (>= 0), or negative on error */
|
|
|
|
static int __devinit i82443bxgx_edacmc_init_one(struct pci_dev *pdev,
|
2007-07-19 04:50:07 -04:00
|
|
|
const struct pci_device_id *ent)
|
2007-07-19 04:49:42 -04:00
|
|
|
{
|
|
|
|
debugf0("MC: " __FILE__ ": %s()\n", __func__);
|
|
|
|
|
|
|
|
/* don't need to call pci_device_enable() */
|
2007-07-19 04:50:07 -04:00
|
|
|
return i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
|
2007-07-19 04:49:42 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __devexit i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
|
|
|
|
{
|
|
|
|
struct mem_ctl_info *mci;
|
|
|
|
|
|
|
|
debugf0(__FILE__ ": %s()\n", __func__);
|
|
|
|
|
2007-07-19 04:50:10 -04:00
|
|
|
if (i82443bxgx_pci)
|
|
|
|
edac_pci_release_generic_ctl(i82443bxgx_pci);
|
|
|
|
|
2007-07-19 04:50:07 -04:00
|
|
|
if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
|
2007-07-19 04:49:42 -04:00
|
|
|
return;
|
|
|
|
|
|
|
|
edac_mc_free(mci);
|
|
|
|
}
|
|
|
|
|
2007-07-19 04:50:07 -04:00
|
|
|
EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_remove_one);
|
2007-07-19 04:49:42 -04:00
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
2008-04-29 04:03:18 -04:00
|
|
|
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
|
|
|
|
opstate_init();
|
|
|
|
|
2007-07-19 04:49:42 -04:00
|
|
|
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");
|
2008-04-29 04:03:18 -04:00
|
|
|
|
|
|
|
module_param(edac_op_state, int, 0444);
|
|
|
|
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
|