[PATCH] EDAC: drivers for Intel i82860, i82875

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/edac/i82860_edac.c

+/*
+ * Intel 82860 Memory Controller kernel module
+ * (C) 2005 Red Hat (http://www.redhat.com)
+ * This file may be distributed under the terms of the
+ * GNU General Public License.
+ *
+ * Written by Ben Woodard <woodard@redhat.com>
+ * shamelessly copied from and based upon the edac_i82875 driver
+ * by Thayne Harbaugh of Linux Networx. (http://lnxi.com)
+ */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/slab.h>
+#include "edac_mc.h"
+
+
+#ifndef PCI_DEVICE_ID_INTEL_82860_0
+#define PCI_DEVICE_ID_INTEL_82860_0	0x2531
+#endif				/* PCI_DEVICE_ID_INTEL_82860_0 */
+
+#define I82860_MCHCFG 0x50
+#define I82860_GBA 0x60
+#define I82860_GBA_MASK 0x7FF
+#define I82860_GBA_SHIFT 24
+#define I82860_ERRSTS 0xC8
+#define I82860_EAP 0xE4
+#define I82860_DERRCTL_STS 0xE2
+
+enum i82860_chips {
+	I82860 = 0,
+};
+
+struct i82860_dev_info {
+	const char *ctl_name;
+};
+
+struct i82860_error_info {
+	u16 errsts;
+	u32 eap;
+	u16 derrsyn;
+	u16 errsts2;
+};
+
+static const struct i82860_dev_info i82860_devs[] = {
+	[I82860] = {
+		    .ctl_name = "i82860"},
+};
+
+static struct pci_dev *mci_pdev = NULL;	/* init dev: in case that AGP code
+					   has already registered driver */
+
+static int i82860_registered = 1;
+
+static void i82860_get_error_info (struct mem_ctl_info *mci,
+		struct i82860_error_info *info)
+{
+	/*
+	 * This is a mess because there is no atomic way to read all the
+	 * registers at once and the registers can transition from CE being
+	 * overwritten by UE.
+	 */
+	pci_read_config_word(mci->pdev, I82860_ERRSTS, &info->errsts);
+	pci_read_config_dword(mci->pdev, I82860_EAP, &info->eap);
+	pci_read_config_word(mci->pdev, I82860_DERRCTL_STS, &info->derrsyn);
+	pci_read_config_word(mci->pdev, I82860_ERRSTS, &info->errsts2);
+
+	pci_write_bits16(mci->pdev, I82860_ERRSTS, 0x0003, 0x0003);
+
+	/*
+	 * If the error is the same for both reads then the first set of reads
+	 * is valid.  If there is a change then there is a CE no info and the
+	 * second set of reads is valid and should be UE info.
+	 */
+	if (!(info->errsts2 & 0x0003))
+		return;
+	if ((info->errsts ^ info->errsts2) & 0x0003) {
+		pci_read_config_dword(mci->pdev, I82860_EAP, &info->eap);
+		pci_read_config_word(mci->pdev, I82860_DERRCTL_STS,
+		    &info->derrsyn);
+	}
+}
+
+static int i82860_process_error_info (struct mem_ctl_info *mci,
+		struct i82860_error_info *info, int handle_errors)
+{
+	int row;
+
+	if (!(info->errsts2 & 0x0003))
+		return 0;
+
+	if (!handle_errors)
+		return 1;
+
+	if ((info->errsts ^ info->errsts2) & 0x0003) {
+		edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
+		info->errsts = info->errsts2;
+	}
+
+	info->eap >>= PAGE_SHIFT;
+	row = edac_mc_find_csrow_by_page(mci, info->eap);
+
+	if (info->errsts & 0x0002)
+		edac_mc_handle_ue(mci, info->eap, 0, row, "i82860 UE");
+	else
+		edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row,
+				       0, "i82860 UE");
+
+	return 1;
+}
+
+static void i82860_check(struct mem_ctl_info *mci)
+{
+	struct i82860_error_info info;
+
+	debugf1("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
+	i82860_get_error_info(mci, &info);
+	i82860_process_error_info(mci, &info, 1);
+}
+
+static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	int rc = -ENODEV;
+	int index;
+	struct mem_ctl_info *mci = NULL;
+	unsigned long last_cumul_size;
+
+	u16 mchcfg_ddim;	/* DRAM Data Integrity Mode 0=none,2=edac */
+
+	/* RDRAM has channels but these don't map onto the abstractions that
+	   edac uses.
+	   The device groups from the GRA registers seem to map reasonably
+	   well onto the notion of a chip select row.
+	   There are 16 GRA registers and since the name is associated with
+	   the channel and the GRA registers map to physical devices so we are
+	   going to make 1 channel for group.
+	 */
+	mci = edac_mc_alloc(0, 16, 1);
+	if (!mci)
+		return -ENOMEM;
+
+	debugf3("MC: " __FILE__ ": %s(): init mci\n", __func__);
+
+	mci->pdev = pdev;
+	mci->mtype_cap = MEM_FLAG_DDR;
+
+
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+	/* I"m not sure about this but I think that all RDRAM is SECDED */
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	/* adjust FLAGS */
+
+	mci->mod_name = BS_MOD_STR;
+	mci->mod_ver = "$Revision: 1.1.2.6 $";
+	mci->ctl_name = i82860_devs[dev_idx].ctl_name;
+	mci->edac_check = i82860_check;
+	mci->ctl_page_to_phys = NULL;
+
+	pci_read_config_word(mci->pdev, I82860_MCHCFG, &mchcfg_ddim);
+	mchcfg_ddim = mchcfg_ddim & 0x180;
+
+	/*
+	 * The group row boundary (GRA) reg values are boundary address
+	 * for each DRAM row with a granularity of 16MB.  GRA regs are
+	 * cumulative; therefore GRA15 will contain the total memory contained
+	 * in all eight rows.
+	 */
+	for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
+		u16 value;
+		u32 cumul_size;
+		struct csrow_info *csrow = &mci->csrows[index];
+
+		pci_read_config_word(mci->pdev, I82860_GBA + index * 2,
+				     &value);
+
+		cumul_size = (value & I82860_GBA_MASK) <<
+		    (I82860_GBA_SHIFT - PAGE_SHIFT);
+		debugf3("MC: " __FILE__ ": %s(): (%d) cumul_size 0x%x\n",
+			__func__, index, cumul_size);
+		if (cumul_size == last_cumul_size)
+			continue;	/* not populated */
+
+		csrow->first_page = last_cumul_size;
+		csrow->last_page = cumul_size - 1;
+		csrow->nr_pages = cumul_size - last_cumul_size;
+		last_cumul_size = cumul_size;
+		csrow->grain = 1 << 12;	/* I82860_EAP has 4KiB reolution */
+		csrow->mtype = MEM_RMBS;
+		csrow->dtype = DEV_UNKNOWN;
+		csrow->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
+	}
+
+	/* clear counters */
+	pci_write_bits16(mci->pdev, I82860_ERRSTS, 0x0003, 0x0003);
+
+	if (edac_mc_add_mc(mci)) {
+		debugf3("MC: " __FILE__
+			": %s(): failed edac_mc_add_mc()\n",
+			__func__);
+		edac_mc_free(mci);
+	} else {
+		/* get this far and it's successful */
+		debugf3("MC: " __FILE__ ": %s(): success\n", __func__);
+		rc = 0;
+	}
+	return rc;
+}
+
+/* returns count (>= 0), or negative on error */
+static int __devinit i82860_init_one(struct pci_dev *pdev,
+				     const struct pci_device_id *ent)
+{
+	int rc;
+
+	debugf0("MC: " __FILE__ ": %s()\n", __func__);
+
+	printk(KERN_INFO "i82860 init one\n");
+	if(pci_enable_device(pdev) < 0)
+		return -EIO;
+	rc = i82860_probe1(pdev, ent->driver_data);
+	if(rc == 0)
+		mci_pdev = pci_dev_get(pdev);
+	return rc;
+}
+
+static void __devexit i82860_remove_one(struct pci_dev *pdev)
+{
+	struct mem_ctl_info *mci;
+
+	debugf0(__FILE__ ": %s()\n", __func__);
+
+	mci = edac_mc_find_mci_by_pdev(pdev);
+	if ((mci != NULL) && (edac_mc_del_mc(mci) == 0))
+		edac_mc_free(mci);
+}
+
+static const struct pci_device_id i82860_pci_tbl[] __devinitdata = {
+	{PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	 I82860},
+	{0,}			/* 0 terminated list. */
+};
+
+MODULE_DEVICE_TABLE(pci, i82860_pci_tbl);
+
+static struct pci_driver i82860_driver = {
+	.name = BS_MOD_STR,
+	.probe = i82860_init_one,
+	.remove = __devexit_p(i82860_remove_one),
+	.id_table = i82860_pci_tbl,
+};
+
+int __init i82860_init(void)
+{
+	int pci_rc;
+
+	debugf3("MC: " __FILE__ ": %s()\n", __func__);
+	if ((pci_rc = pci_register_driver(&i82860_driver)) < 0)
+		return pci_rc;
+
+	if (!mci_pdev) {
+		i82860_registered = 0;
+		mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
+					  PCI_DEVICE_ID_INTEL_82860_0, NULL);
+		if (mci_pdev == NULL) {
+			debugf0("860 pci_get_device fail\n");
+			return -ENODEV;
+		}
+		pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl);
+		if (pci_rc < 0) {
+			debugf0("860 init fail\n");
+			pci_dev_put(mci_pdev);
+			return -ENODEV;
+		}
+	}
+	return 0;
+}
+
+static void __exit i82860_exit(void)
+{
+	debugf3("MC: " __FILE__ ": %s()\n", __func__);
+
+	pci_unregister_driver(&i82860_driver);
+	if (!i82860_registered) {
+		i82860_remove_one(mci_pdev);
+		pci_dev_put(mci_pdev);
+	}
+}
+
+module_init(i82860_init);
+module_exit(i82860_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR
+    ("Red Hat Inc. (http://www.redhat.com.com) Ben Woodard <woodard@redhat.com>");
+MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers");