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- /*
- * Radisys 82600 Embedded chipset Memory Controller kernel module
- * (C) 2005 EADS Astrium
- * This file may be distributed under the terms of the
- * GNU General Public License.
- *
- * Written by Tim Small <tim@buttersideup.com>, based on work by Thayne
- * Harbaugh, Dan Hollis <goemon at anime dot net> and others.
- *
- * $Id: edac_r82600.c,v 1.1.2.6 2005/10/05 00:43:44 dsp_llnl Exp $
- *
- * Written with reference to 82600 High Integration Dual PCI System
- * Controller Data Book:
- * www.radisys.com/files/support_downloads/007-01277-0002.82600DataBook.pdf
- * references to this document given in []
- */
- #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 R82600_REVISION " Ver: 2.0.2"
- #define EDAC_MOD_STR "r82600_edac"
- #define r82600_printk(level, fmt, arg...) \
- edac_printk(level, "r82600", fmt, ##arg)
- #define r82600_mc_printk(mci, level, fmt, arg...) \
- edac_mc_chipset_printk(mci, level, "r82600", fmt, ##arg)
- /* Radisys say "The 82600 integrates a main memory SDRAM controller that
- * supports up to four banks of memory. The four banks can support a mix of
- * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs,
- * each of which can be any size from 16MB to 512MB. Both registered (control
- * signals buffered) and unbuffered DIMM types are supported. Mixing of
- * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs
- * is not allowed. The 82600 SDRAM interface operates at the same frequency as
- * the CPU bus, 66MHz, 100MHz or 133MHz."
- */
- #define R82600_NR_CSROWS 4
- #define R82600_NR_CHANS 1
- #define R82600_NR_DIMMS 4
- #define R82600_BRIDGE_ID 0x8200
- /* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */
- #define R82600_DRAMC 0x57 /* Various SDRAM related control bits
- * all bits are R/W
- *
- * 7 SDRAM ISA Hole Enable
- * 6 Flash Page Mode Enable
- * 5 ECC Enable: 1=ECC 0=noECC
- * 4 DRAM DIMM Type: 1=
- * 3 BIOS Alias Disable
- * 2 SDRAM BIOS Flash Write Enable
- * 1:0 SDRAM Refresh Rate: 00=Disabled
- * 01=7.8usec (256Mbit SDRAMs)
- * 10=15.6us 11=125usec
- */
- #define R82600_SDRAMC 0x76 /* "SDRAM Control Register"
- * More SDRAM related control bits
- * all bits are R/W
- *
- * 15:8 Reserved.
- *
- * 7:5 Special SDRAM Mode Select
- *
- * 4 Force ECC
- *
- * 1=Drive ECC bits to 0 during
- * write cycles (i.e. ECC test mode)
- *
- * 0=Normal ECC functioning
- *
- * 3 Enhanced Paging Enable
- *
- * 2 CAS# Latency 0=3clks 1=2clks
- *
- * 1 RAS# to CAS# Delay 0=3 1=2
- *
- * 0 RAS# Precharge 0=3 1=2
- */
- #define R82600_EAP 0x80 /* ECC Error Address Pointer Register
- *
- * 31 Disable Hardware Scrubbing (RW)
- * 0=Scrub on corrected read
- * 1=Don't scrub on corrected read
- *
- * 30:12 Error Address Pointer (RO)
- * Upper 19 bits of error address
- *
- * 11:4 Syndrome Bits (RO)
- *
- * 3 BSERR# on multibit error (RW)
- * 1=enable 0=disable
- *
- * 2 NMI on Single Bit Eror (RW)
- * 1=NMI triggered by SBE n.b. other
- * prerequeists
- * 0=NMI not triggered
- *
- * 1 MBE (R/WC)
- * read 1=MBE at EAP (see above)
- * read 0=no MBE, or SBE occurred first
- * write 1=Clear MBE status (must also
- * clear SBE)
- * write 0=NOP
- *
- * 1 SBE (R/WC)
- * read 1=SBE at EAP (see above)
- * read 0=no SBE, or MBE occurred first
- * write 1=Clear SBE status (must also
- * clear MBE)
- * write 0=NOP
- */
- #define R82600_DRBA 0x60 /* + 0x60..0x63 SDRAM Row Boundary Address
- * Registers
- *
- * 7:0 Address lines 30:24 - upper limit of
- * each row [p57]
- */
- struct r82600_error_info {
- u32 eapr;
- };
- static unsigned int disable_hardware_scrub;
- static struct edac_pci_ctl_info *r82600_pci;
- static void r82600_get_error_info(struct mem_ctl_info *mci,
- struct r82600_error_info *info)
- {
- struct pci_dev *pdev;
- pdev = to_pci_dev(mci->dev);
- pci_read_config_dword(pdev, R82600_EAP, &info->eapr);
- if (info->eapr & BIT(0))
- /* Clear error to allow next error to be reported [p.62] */
- pci_write_bits32(pdev, R82600_EAP,
- ((u32) BIT(0) & (u32) BIT(1)),
- ((u32) BIT(0) & (u32) BIT(1)));
- if (info->eapr & BIT(1))
- /* Clear error to allow next error to be reported [p.62] */
- pci_write_bits32(pdev, R82600_EAP,
- ((u32) BIT(0) & (u32) BIT(1)),
- ((u32) BIT(0) & (u32) BIT(1)));
- }
- static int r82600_process_error_info(struct mem_ctl_info *mci,
- struct r82600_error_info *info,
- int handle_errors)
- {
- int error_found;
- u32 eapaddr, page;
- u32 syndrome;
- error_found = 0;
- /* bits 30:12 store the upper 19 bits of the 32 bit error address */
- eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13;
- /* Syndrome in bits 11:4 [p.62] */
- syndrome = (info->eapr >> 4) & 0xFF;
- /* the R82600 reports at less than page *
- * granularity (upper 19 bits only) */
- page = eapaddr >> PAGE_SHIFT;
- if (info->eapr & BIT(0)) { /* CE? */
- error_found = 1;
- if (handle_errors)
- edac_mc_handle_ce(mci, page, 0, /* not avail */
- syndrome,
- edac_mc_find_csrow_by_page(mci, page),
- 0, mci->ctl_name);
- }
- if (info->eapr & BIT(1)) { /* UE? */
- error_found = 1;
- if (handle_errors)
- /* 82600 doesn't give enough info */
- edac_mc_handle_ue(mci, page, 0,
- edac_mc_find_csrow_by_page(mci, page),
- mci->ctl_name);
- }
- return error_found;
- }
- static void r82600_check(struct mem_ctl_info *mci)
- {
- struct r82600_error_info info;
- debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
- r82600_get_error_info(mci, &info);
- r82600_process_error_info(mci, &info, 1);
- }
- static inline int ecc_enabled(u8 dramcr)
- {
- return dramcr & BIT(5);
- }
- static void r82600_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
- u8 dramcr)
- {
- struct csrow_info *csrow;
- int index;
- u8 drbar; /* SDRAM Row Boundary Address Register */
- u32 row_high_limit, row_high_limit_last;
- u32 reg_sdram, ecc_on, row_base;
- ecc_on = ecc_enabled(dramcr);
- reg_sdram = dramcr & BIT(4);
- row_high_limit_last = 0;
- for (index = 0; index < mci->nr_csrows; index++) {
- csrow = &mci->csrows[index];
- /* find the DRAM Chip Select Base address and mask */
- pci_read_config_byte(pdev, R82600_DRBA + index, &drbar);
- debugf1("%s() Row=%d DRBA = %#0x\n", __func__, index, drbar);
- row_high_limit = ((u32) drbar << 24);
- /* row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
- debugf1("%s() Row=%d, Boundary Address=%#0x, Last = %#0x\n",
- __func__, index, row_high_limit, row_high_limit_last);
- /* Empty row [p.57] */
- if (row_high_limit == row_high_limit_last)
- continue;
- row_base = row_high_limit_last;
- csrow->first_page = row_base >> PAGE_SHIFT;
- csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
- csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
- /* Error address is top 19 bits - so granularity is *
- * 14 bits */
- csrow->grain = 1 << 14;
- csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
- /* FIXME - check that this is unknowable with this chipset */
- csrow->dtype = DEV_UNKNOWN;
- /* Mode is global on 82600 */
- csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
- row_high_limit_last = row_high_limit;
- }
- }
- static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
- {
- struct mem_ctl_info *mci;
- u8 dramcr;
- u32 eapr;
- u32 scrub_disabled;
- u32 sdram_refresh_rate;
- struct r82600_error_info discard;
- debugf0("%s()\n", __func__);
- pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
- pci_read_config_dword(pdev, R82600_EAP, &eapr);
- scrub_disabled = eapr & BIT(31);
- sdram_refresh_rate = dramcr & (BIT(0) | BIT(1));
- debugf2("%s(): sdram refresh rate = %#0x\n", __func__,
- sdram_refresh_rate);
- debugf2("%s(): DRAMC register = %#0x\n", __func__, dramcr);
- mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS, 0);
- if (mci == NULL)
- return -ENOMEM;
- debugf0("%s(): mci = %p\n", __func__, mci);
- mci->dev = &pdev->dev;
- mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
- mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
- /* FIXME try to work out if the chip leads have been used for COM2
- * instead on this board? [MA6?] MAYBE:
- */
- /* On the R82600, the pins for memory bits 72:65 - i.e. the *
- * EC bits are shared with the pins for COM2 (!), so if COM2 *
- * is enabled, we assume COM2 is wired up, and thus no EDAC *
- * is possible. */
- mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
- if (ecc_enabled(dramcr)) {
- if (scrub_disabled)
- debugf3("%s(): mci = %p - Scrubbing disabled! EAP: "
- "%#0x\n", __func__, mci, eapr);
- } else
- mci->edac_cap = EDAC_FLAG_NONE;
- mci->mod_name = EDAC_MOD_STR;
- mci->mod_ver = R82600_REVISION;
- mci->ctl_name = "R82600";
- mci->dev_name = pci_name(pdev);
- mci->edac_check = r82600_check;
- mci->ctl_page_to_phys = NULL;
- r82600_init_csrows(mci, pdev, dramcr);
- r82600_get_error_info(mci, &discard); /* clear counters */
- /* Here we assume that we will never see multiple instances of this
- * type of memory controller. The ID is therefore hardcoded to 0.
- */
- if (edac_mc_add_mc(mci)) {
- debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
- goto fail;
- }
- /* get this far and it's successful */
- if (disable_hardware_scrub) {
- debugf3("%s(): Disabling Hardware Scrub (scrub on error)\n",
- __func__);
- pci_write_bits32(pdev, R82600_EAP, BIT(31), BIT(31));
- }
- /* allocating generic PCI control info */
- r82600_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
- if (!r82600_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("%s(): success\n", __func__);
- return 0;
- fail:
- edac_mc_free(mci);
- return -ENODEV;
- }
- /* returns count (>= 0), or negative on error */
- static int __devinit r82600_init_one(struct pci_dev *pdev,
- const struct pci_device_id *ent)
- {
- debugf0("%s()\n", __func__);
- /* don't need to call pci_enable_device() */
- return r82600_probe1(pdev, ent->driver_data);
- }
- static void __devexit r82600_remove_one(struct pci_dev *pdev)
- {
- struct mem_ctl_info *mci;
- debugf0("%s()\n", __func__);
- if (r82600_pci)
- edac_pci_release_generic_ctl(r82600_pci);
- if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
- return;
- edac_mc_free(mci);
- }
- static const struct pci_device_id r82600_pci_tbl[] __devinitdata = {
- {
- PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID)
- },
- {
- 0,
- } /* 0 terminated list. */
- };
- MODULE_DEVICE_TABLE(pci, r82600_pci_tbl);
- static struct pci_driver r82600_driver = {
- .name = EDAC_MOD_STR,
- .probe = r82600_init_one,
- .remove = __devexit_p(r82600_remove_one),
- .id_table = r82600_pci_tbl,
- };
- static int __init r82600_init(void)
- {
- /* Ensure that the OPSTATE is set correctly for POLL or NMI */
- opstate_init();
- return pci_register_driver(&r82600_driver);
- }
- static void __exit r82600_exit(void)
- {
- pci_unregister_driver(&r82600_driver);
- }
- module_init(r82600_init);
- module_exit(r82600_exit);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. "
- "on behalf of EADS Astrium");
- MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers");
- module_param(disable_hardware_scrub, bool, 0644);
- MODULE_PARM_DESC(disable_hardware_scrub,
- "If set, disable the chipset's automatic scrub for CEs");
- module_param(edac_op_state, int, 0444);
- MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
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