--- /dev/null
+/*
+ * 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/edac.h>
+#include "edac_core.h"
+
+#define AMD76X_REVISION " Ver: 2.0.2"
+#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_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->pdev);
+ 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_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
+ mci->csrows[row]->first_page, 0, 0,
+ row, 0, -1,
+ 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_error(HW_EVENT_ERR_CORRECTED, mci, 1,
+ mci->csrows[row]->first_page, 0, 0,
+ row, 0, -1,
+ 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;
+ edac_dbg(3, "\n");
+ 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;
+ struct dimm_info *dimm;
+ u32 mba, mba_base, mba_mask, dms;
+ int index;
+
+ for (index = 0; index < mci->nr_csrows; index++) {
+ csrow = mci->csrows[index];
+ dimm = csrow->channels[0]->dimm;
+
+ /* 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;
+ dimm->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
+ csrow->last_page = csrow->first_page + dimm->nr_pages - 1;
+ csrow->page_mask = mba_mask >> PAGE_SHIFT;
+ dimm->grain = dimm->nr_pages << PAGE_SHIFT;
+ dimm->mtype = MEM_RDDR;
+ dimm->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
+ dimm->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;
+ struct edac_mc_layer layers[2];
+ u32 ems;
+ u32 ems_mode;
+ struct amd76x_error_info discard;
+
+ edac_dbg(0, "\n");
+ pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
+ ems_mode = (ems >> 10) & 0x3;
+
+ layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+ layers[0].size = AMD76X_NR_CSROWS;
+ layers[0].is_virt_csrow = true;
+ layers[1].type = EDAC_MC_LAYER_CHANNEL;
+ layers[1].size = 1;
+ layers[1].is_virt_csrow = false;
+ mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
+
+ if (mci == NULL)
+ return -ENOMEM;
+
+ edac_dbg(0, "mci = %p\n", mci);
+ mci->pdev = &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)) {
+ edac_dbg(3, "failed edac_mc_add_mc()\n");
+ 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 */
+ edac_dbg(3, "success\n");
+ return 0;
+
+fail:
+ edac_mc_free(mci);
+ return -ENODEV;
+}
+
+/* returns count (>= 0), or negative on error */
+static int amd76x_init_one(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ edac_dbg(0, "\n");
+
+ /* don't need to call pci_enable_device() */
+ 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 amd76x_remove_one(struct pci_dev *pdev)
+{
+ struct mem_ctl_info *mci;
+
+ edac_dbg(0, "\n");
+
+ 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[] = {
+ {
+ 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 = 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");
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