diff options
Diffstat (limited to 'drivers/edac/amd76x_edac.c')
| -rw-r--r-- | drivers/edac/amd76x_edac.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/edac/amd76x_edac.c b/drivers/edac/amd76x_edac.c new file mode 100644 index 0000000..2b95f1a --- /dev/null +++ b/drivers/edac/amd76x_edac.c @@ -0,0 +1,367 @@ +/* + * AMD 76x Memory Controller kernel module + * (C) 2003 Linux Networx (http://lnxi.com) + * This file may be distributed under the terms of the + * GNU General Public License. + * + * Written by Thayne Harbaugh + * Based on work by Dan Hollis <goemon at anime dot net> and others. + * http://www.anime.net/~goemon/linux-ecc/ + * + * $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $ + * + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/pci_ids.h> +#include <linux/slab.h> +#include <linux/edac.h> +#include "edac_core.h" + +#define AMD76X_REVISION " Ver: 2.0.2 " __DATE__ +#define EDAC_MOD_STR "amd76x_edac" + +#define amd76x_printk(level, fmt, arg...) \ + edac_printk(level, "amd76x", fmt, ##arg) + +#define amd76x_mc_printk(mci, level, fmt, arg...) \ + edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg) + +#define AMD76X_NR_CSROWS 8 +#define AMD76X_NR_CHANS 1 +#define AMD76X_NR_DIMMS 4 + +/* AMD 76x register addresses - device 0 function 0 - PCI bridge */ + +#define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b) + * + * 31:16 reserved + * 15:14 SERR enabled: x1=ue 1x=ce + * 13 reserved + * 12 diag: disabled, enabled + * 11:10 mode: dis, EC, ECC, ECC+scrub + * 9:8 status: x1=ue 1x=ce + * 7:4 UE cs row + * 3:0 CE cs row + */ + +#define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b) + * + * 31:26 clock disable 5 - 0 + * 25 SDRAM init + * 24 reserved + * 23 mode register service + * 22:21 suspend to RAM + * 20 burst refresh enable + * 19 refresh disable + * 18 reserved + * 17:16 cycles-per-refresh + * 15:8 reserved + * 7:0 x4 mode enable 7 - 0 + */ + +#define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b) + * + * 31:23 chip-select base + * 22:16 reserved + * 15:7 chip-select mask + * 6:3 reserved + * 2:1 address mode + * 0 chip-select enable + */ + +struct amd76x_error_info { + u32 ecc_mode_status; +}; + +enum amd76x_chips { + AMD761 = 0, + AMD762 +}; + +struct amd76x_dev_info { + const char *ctl_name; +}; + +static const struct amd76x_dev_info amd76x_devs[] = { + [AMD761] = { + .ctl_name = "AMD761"}, + [AMD762] = { + .ctl_name = "AMD762"}, +}; + +static struct edac_pci_ctl_info *amd76x_pci; + +/** + * amd76x_get_error_info - fetch error information + * @mci: Memory controller + * @info: Info to fill in + * + * Fetch and store the AMD76x ECC status. Clear pending status + * on the chip so that further errors will be reported + */ +static void amd76x_get_error_info(struct mem_ctl_info *mci, + struct amd76x_error_info *info) +{ + struct pci_dev *pdev; + + pdev = to_pci_dev(mci->dev); + pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, + &info->ecc_mode_status); + + if (info->ecc_mode_status & BIT(8)) + pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS, + (u32) BIT(8), (u32) BIT(8)); + + if (info->ecc_mode_status & BIT(9)) + pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS, + (u32) BIT(9), (u32) BIT(9)); +} + +/** + * amd76x_process_error_info - Error check + * @mci: Memory controller + * @info: Previously fetched information from chip + * @handle_errors: 1 if we should do recovery + * + * Process the chip state and decide if an error has occurred. + * A return of 1 indicates an error. Also if handle_errors is true + * then attempt to handle and clean up after the error + */ +static int amd76x_process_error_info(struct mem_ctl_info *mci, + struct amd76x_error_info *info, + int handle_errors) +{ + int error_found; + u32 row; + + error_found = 0; + + /* + * Check for an uncorrectable error + */ + if (info->ecc_mode_status & BIT(8)) { + error_found = 1; + + if (handle_errors) { + row = (info->ecc_mode_status >> 4) & 0xf; + edac_mc_handle_ue(mci, mci->csrows[row].first_page, 0, + row, mci->ctl_name); + } + } + + /* + * Check for a correctable error + */ + if (info->ecc_mode_status & BIT(9)) { + error_found = 1; + + if (handle_errors) { + row = info->ecc_mode_status & 0xf; + edac_mc_handle_ce(mci, mci->csrows[row].first_page, 0, + 0, row, 0, mci->ctl_name); + } + } + + return error_found; +} + +/** + * amd76x_check - Poll the controller + * @mci: Memory controller + * + * Called by the poll handlers this function reads the status + * from the controller and checks for errors. + */ +static void amd76x_check(struct mem_ctl_info *mci) +{ + struct amd76x_error_info info; + debugf3("%s()\n", __func__); + amd76x_get_error_info(mci, &info); + amd76x_process_error_info(mci, &info, 1); +} + +static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev, + enum edac_type edac_mode) +{ + struct csrow_info *csrow; + u32 mba, mba_base, mba_mask, dms; + int index; + + for (index = 0; index < mci->nr_csrows; index++) { + csrow = &mci->csrows[index]; + + /* find the DRAM Chip Select Base address and mask */ + pci_read_config_dword(pdev, + AMD76X_MEM_BASE_ADDR + (index * 4), &mba); + + if (!(mba & BIT(0))) + continue; + + mba_base = mba & 0xff800000UL; + mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL; + pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms); + csrow->first_page = mba_base >> PAGE_SHIFT; + csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT; + csrow->last_page = csrow->first_page + csrow->nr_pages - 1; + csrow->page_mask = mba_mask >> PAGE_SHIFT; + csrow->grain = csrow->nr_pages << PAGE_SHIFT; + csrow->mtype = MEM_RDDR; + csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN; + csrow->edac_mode = edac_mode; + } +} + +/** + * amd76x_probe1 - Perform set up for detected device + * @pdev; PCI device detected + * @dev_idx: Device type index + * + * We have found an AMD76x and now need to set up the memory + * controller status reporting. We configure and set up the + * memory controller reporting and claim the device. + */ +static int amd76x_probe1(struct pci_dev *pdev, int dev_idx) +{ + static const enum edac_type ems_modes[] = { + EDAC_NONE, + EDAC_EC, + EDAC_SECDED, + EDAC_SECDED + }; + struct mem_ctl_info *mci = NULL; + u32 ems; + u32 ems_mode; + struct amd76x_error_info discard; + + debugf0("%s()\n", __func__); + pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems); + ems_mode = (ems >> 10) & 0x3; + mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_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; + mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED; + mci->edac_cap = ems_mode ? + (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE; + mci->mod_name = EDAC_MOD_STR; + mci->mod_ver = AMD76X_REVISION; + mci->ctl_name = amd76x_devs[dev_idx].ctl_name; + mci->dev_name = pci_name(pdev); + mci->edac_check = amd76x_check; + mci->ctl_page_to_phys = NULL; + + amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]); + amd76x_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; + } + + /* allocating generic PCI control info */ + amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR); + if (!amd76x_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__); + } + + /* get this far and it's successful */ + debugf3("%s(): success\n", __func__); + return 0; + +fail: + edac_mc_free(mci); + return -ENODEV; +} + +/* returns count (>= 0), or negative on error */ +static int __devinit amd76x_init_one(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + debugf0("%s()\n", __func__); + + /* don't need to call pci_device_enable() */ + return amd76x_probe1(pdev, ent->driver_data); +} + +/** + * amd76x_remove_one - driver shutdown + * @pdev: PCI device being handed back + * + * Called when the driver is unloaded. Find the matching mci + * structure for the device then delete the mci and free the + * resources. + */ +static void __devexit amd76x_remove_one(struct pci_dev *pdev) +{ + struct mem_ctl_info *mci; + + debugf0("%s()\n", __func__); + + if (amd76x_pci) + edac_pci_release_generic_ctl(amd76x_pci); + + if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL) + return; + + edac_mc_free(mci); +} + +static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = { + { + PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0, + AMD762}, + { + PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0, + AMD761}, + { + 0, + } /* 0 terminated list. */ +}; + +MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl); + +static struct pci_driver amd76x_driver = { + .name = EDAC_MOD_STR, + .probe = amd76x_init_one, + .remove = __devexit_p(amd76x_remove_one), + .id_table = amd76x_pci_tbl, +}; + +static int __init amd76x_init(void) +{ + /* Ensure that the OPSTATE is set correctly for POLL or NMI */ + opstate_init(); + + return pci_register_driver(&amd76x_driver); +} + +static void __exit amd76x_exit(void) +{ + pci_unregister_driver(&amd76x_driver); +} + +module_init(amd76x_init); +module_exit(amd76x_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh"); +MODULE_DESCRIPTION("MC support for AMD 76x memory controllers"); + +module_param(edac_op_state, int, 0444); +MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI"); |
