MIPS: Cavium: Add EDAC support.

Drivers for EDAC on Cavium.  Supported subsystems are:

 o CPU primary caches.  These are parity protected only, so only error
   reporting.
 o Second level cache - ECC protected, provides SECDED.
 o Memory: ECC / SECDEC if used with suitable DRAM modules.  The driver will
   will only initialize if ECC is enabled on a system so is safe to run on
   non-ECC memory.
 o PCI: Parity error reporting

Since it is very hard to test this sort of code the implementation is very
conservative and uses polling where possible for now.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
Reviewed-by: NBorislav Petkov <borislav.petkov@amd.com>

MAINTAINERS

@@ -2722,6 +2722,15 @@ W:	bluesmoke.sourceforge.net
 S:	Maintained
 F:	drivers/edac/amd64_edac*
 
+EDAC-CAVIUM
+M:	Ralf Baechle <ralf@linux-mips.org>
+M:	David Daney <david.daney@cavium.com>
+L:	linux-edac@vger.kernel.org
+L:	linux-mips@linux-mips.org
+W:	bluesmoke.sourceforge.net
+S:	Supported
+F:	drivers/edac/octeon_edac*
+
 EDAC-E752X
 M:	Mark Gross <mark.gross@intel.com>
 M:	Doug Thompson <dougthompson@xmission.com>

arch/mips/Kconfig

@@ -774,6 +774,7 @@ config CAVIUM_OCTEON_REFERENCE_BOARD
 	select DMA_COHERENT
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
+	select EDAC_SUPPORT
 	select SYS_SUPPORTS_HOTPLUG_CPU
 	select SYS_HAS_EARLY_PRINTK
 	select SYS_HAS_CPU_CAVIUM_OCTEON

arch/mips/cavium-octeon/setup.c

@@ -4,9 +4,11 @@
  * for more details.
  *
  * Copyright (C) 2004-2007 Cavium Networks
- * Copyright (C) 2008 Wind River Systems
+ * Copyright (C) 2008, 2009 Wind River Systems
+ *   written by Ralf Baechle <ralf@linux-mips.org>
  */
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/export.h>
@@ -821,3 +823,29 @@ void __init device_tree_init(void)
 	}
 	unflatten_device_tree();
 }
+
+static char *edac_device_names[] = {
+	"co_l2c_edac",
+	"co_lmc_edac",
+	"co_pc_edac",
+};
+
+static int __init edac_devinit(void)
+{
+	struct platform_device *dev;
+	int i, err = 0;
+	char *name;
+
+	for (i = 0; i < ARRAY_SIZE(edac_device_names); i++) {
+		name = edac_device_names[i];
+		dev = platform_device_register_simple(name, -1, NULL, 0);
+		if (IS_ERR(dev)) {
+			pr_err("Registation of %s failed!\n", name);
+			err = PTR_ERR(dev);
+		}
+	}
+
+	return err;
+}
+
+device_initcall(edac_devinit);

arch/mips/mm/c-octeon.c

@@ -5,6 +5,7 @@
  *
  * Copyright (C) 2005-2007 Cavium Networks
  */
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
@@ -28,6 +29,7 @@
 #include <asm/octeon/octeon.h>
 
 unsigned long long cache_err_dcache[NR_CPUS];
+EXPORT_SYMBOL_GPL(cache_err_dcache);
 
 /**
  * Octeon automatically flushes the dcache on tlb changes, so
@@ -288,42 +290,42 @@ void __cpuinit octeon_cache_init(void)
  * Handle a cache error exception
  */
 
-static void  cache_parity_error_octeon(int non_recoverable)
+static RAW_NOTIFIER_HEAD(co_cache_error_chain);
+
+int register_co_cache_error_notifier(struct notifier_block *nb)
 {
-	unsigned long coreid = cvmx_get_core_num();
-	uint64_t icache_err = read_octeon_c0_icacheerr();
-
-	pr_err("Cache error exception:\n");
-	pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
-	if (icache_err & 1) {
-		pr_err("CacheErr (Icache) == %llx\n",
-		       (unsigned long long)icache_err);
-		write_octeon_c0_icacheerr(0);
-	}
-	if (cache_err_dcache[coreid] & 1) {
-		pr_err("CacheErr (Dcache) == %llx\n",
-		       (unsigned long long)cache_err_dcache[coreid]);
-		cache_err_dcache[coreid] = 0;
-	}
+	return raw_notifier_chain_register(&co_cache_error_chain, nb);
+}
+EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);
 
-	if (non_recoverable)
-		panic("Can't handle cache error: nested exception");
+int unregister_co_cache_error_notifier(struct notifier_block *nb)
+{
+	return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);
+
+static inline int co_cache_error_call_notifiers(unsigned long val)
+{
+	return raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
 }
 
 /**
  * Called when the the exception is recoverable
  */
-
 asmlinkage void cache_parity_error_octeon_recoverable(void)
 {
-	cache_parity_error_octeon(0);
+	co_cache_error_call_notifiers(0);
 }
 
 /**
  * Called when the the exception is not recoverable
+ *
+ * The issue not that the cache error exception itself was non-recoverable
+ * but that due to nesting of exception may have lost some state so can't
+ * continue.
  */
-
 asmlinkage void cache_parity_error_octeon_non_recoverable(void)
 {
-	cache_parity_error_octeon(1);
+	co_cache_error_call_notifiers(1);
+	panic("Can't handle cache error: nested exception");
 }

arch/mips/pci/pci-octeon.c

@@ -11,6 +11,7 @@
 #include <linux/interrupt.h>
 #include <linux/time.h>
 #include <linux/delay.h>
+#include <linux/platform_device.h>
 #include <linux/swiotlb.h>
 
 #include <asm/time.h>
@@ -704,6 +705,9 @@ static int __init octeon_pci_setup(void)
 	 */
 	cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1);
 
+	if (IS_ERR(platform_device_register_simple("co_pci_edac", 0, NULL, 0)))
+		pr_err("Registation of co_pci_edac failed!\n");
+
 	octeon_pci_dma_init();
 
 	return 0;

drivers/edac/Kconfig

@@ -7,7 +7,7 @@
 menuconfig EDAC
 	bool "EDAC (Error Detection And Correction) reporting"
 	depends on HAS_IOMEM
-	depends on X86 || PPC || TILE || ARM
+	depends on X86 || PPC || TILE || ARM || EDAC_SUPPORT
 	help
 	  EDAC is designed to report errors in the core system.
 	  These are low-level errors that are reported in the CPU or
@@ -27,6 +27,9 @@ menuconfig EDAC
 	  There is also a mailing list for the EDAC project, which can
 	  be found via the sourceforge page.
 
+config EDAC_SUPPORT
+	bool
+
 if EDAC
 
 comment "Reporting subsystems"
@@ -316,4 +319,32 @@ config EDAC_HIGHBANK_L2
 	  Support for error detection and correction on the
 	  Calxeda Highbank memory controller.
 
+config EDAC_OCTEON_PC
+	tristate "Cavium Octeon Primary Caches"
+	depends on EDAC_MM_EDAC && CPU_CAVIUM_OCTEON
+	help
+	  Support for error detection and correction on the primary caches of
+	  the cnMIPS cores of Cavium Octeon family SOCs.
+
+config EDAC_OCTEON_L2C
+	tristate "Cavium Octeon Secondary Caches (L2C)"
+	depends on EDAC_MM_EDAC && CPU_CAVIUM_OCTEON
+	help
+	  Support for error detection and correction on the
+	  Cavium Octeon family of SOCs.
+
+config EDAC_OCTEON_LMC
+	tristate "Cavium Octeon DRAM Memory Controller (LMC)"
+	depends on EDAC_MM_EDAC && CPU_CAVIUM_OCTEON
+	help
+	  Support for error detection and correction on the
+	  Cavium Octeon family of SOCs.
+
+config EDAC_OCTEON_PCI
+	tristate "Cavium Octeon PCI Controller"
+	depends on EDAC_MM_EDAC && PCI && CPU_CAVIUM_OCTEON
+	help
+	  Support for error detection and correction on the
+	  Cavium Octeon family of SOCs.
+
 endif # EDAC

drivers/edac/Makefile

@@ -58,3 +58,8 @@ obj-$(CONFIG_EDAC_TILE)			+= tile_edac.o
 
 obj-$(CONFIG_EDAC_HIGHBANK_MC)	+= highbank_mc_edac.o
 obj-$(CONFIG_EDAC_HIGHBANK_L2)	+= highbank_l2_edac.o
+
+obj-$(CONFIG_EDAC_OCTEON_PC)		+= octeon_edac-pc.o
+obj-$(CONFIG_EDAC_OCTEON_L2C)		+= octeon_edac-l2c.o
+obj-$(CONFIG_EDAC_OCTEON_LMC)		+= octeon_edac-lmc.o
+obj-$(CONFIG_EDAC_OCTEON_PCI)		+= octeon_edac-pci.o

drivers/edac/octeon_edac-l2c.c

+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Wind River Systems,
+ *   written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/edac.h>
+
+#include <asm/octeon/cvmx.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+
+#define EDAC_MOD_STR "octeon-l2c"
+
+static void co_l2c_poll(struct edac_device_ctl_info *l2c)
+{
+	union cvmx_l2t_err l2t_err;
+
+	l2t_err.u64 = cvmx_read_csr(CVMX_L2T_ERR);
+	if (l2t_err.s.sec_err) {
+		edac_device_handle_ce(l2c, 0, 0,
+				      "Single bit error (corrected)");
+		l2t_err.s.sec_err = 1;		/* Reset */
+		cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64);
+	}
+	if (l2t_err.s.ded_err) {
+		edac_device_handle_ue(l2c, 0, 0,
+				      "Double bit error (corrected)");
+		l2t_err.s.ded_err = 1;		/* Reset */
+		cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64);
+	}
+}
+
+static int __devinit co_l2c_probe(struct platform_device *pdev)
+{
+	struct edac_device_ctl_info *l2c;
+	union cvmx_l2t_err l2t_err;
+	int res = 0;
+
+	l2c = edac_device_alloc_ctl_info(0, "l2c", 1, NULL, 0, 0,
+					 NULL, 0, edac_device_alloc_index());
+	if (!l2c)
+		return -ENOMEM;
+
+	l2c->dev = &pdev->dev;
+	platform_set_drvdata(pdev, l2c);
+	l2c->dev_name = dev_name(&pdev->dev);
+
+	l2c->mod_name = "octeon-l2c";
+	l2c->ctl_name = "octeon_l2c_err";
+	l2c->edac_check = co_l2c_poll;
+
+	if (edac_device_add_device(l2c) > 0) {
+		pr_err("%s: edac_device_add_device() failed\n", __func__);
+		goto err;
+	}
+
+	l2t_err.u64 = cvmx_read_csr(CVMX_L2T_ERR);
+	l2t_err.s.sec_intena = 0;	/* We poll */
+	l2t_err.s.ded_intena = 0;
+	l2t_err.s.sec_err = 1;		/* Clear, just in case */
+	l2t_err.s.ded_err = 1;
+	cvmx_write_csr(CVMX_L2T_ERR, l2t_err.u64);
+
+	return 0;
+
+err:
+	edac_device_free_ctl_info(l2c);
+
+	return res;
+}
+
+static int co_l2c_remove(struct platform_device *pdev)
+{
+	struct edac_device_ctl_info *l2c = platform_get_drvdata(pdev);
+
+	edac_device_del_device(&pdev->dev);
+	edac_device_free_ctl_info(l2c);
+
+	return 0;
+}
+
+static struct platform_driver co_l2c_driver = {
+	.probe = co_l2c_probe,
+	.remove = co_l2c_remove,
+	.driver = {
+		   .name = "co_l2c_edac",
+	}
+};
+
+static int __init co_edac_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&co_l2c_driver);
+	if (ret)
+		pr_warning(EDAC_MOD_STR " EDAC failed to register\n");
+
+	return ret;
+}
+
+static void __exit co_edac_exit(void)
+{
+	platform_driver_unregister(&co_l2c_driver);
+}
+
+module_init(co_edac_init);
+module_exit(co_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");

drivers/edac/octeon_edac-lmc.c

+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Wind River Systems,
+ *   written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/edac.h>
+
+#include <asm/octeon/cvmx.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+#include "octeon_edac-lmc.h"
+
+#define EDAC_MOD_STR "octeon"
+
+static struct mem_ctl_info *mc_cavium;
+static void *lmc_base;
+
+static void co_lmc_poll(struct mem_ctl_info *mci)
+{
+	union lmc_mem_cfg0 cfg0;
+	union lmc_fadr fadr;
+	char msg[64];
+
+	fadr.u64 = readq(lmc_base + LMC_FADR);
+	cfg0.u64 = readq(lmc_base + LMC_MEM_CFG0);
+	snprintf(msg, sizeof(msg), "DIMM %d rank %d bank %d row %d col %d",
+		fadr.fdimm, fadr.fbunk, fadr.fbank, fadr.frow, fadr.fcol);
+
+	if (cfg0.sec_err) {
+		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 0, 0, 0, -1, -1, -1,
+				     msg, "");
+
+		cfg0.intr_sec_ena = -1;		/* Done, re-arm */
+	}
+
+	if (cfg0.ded_err) {
+		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0, -1, -1, -1,
+				     msg, "");
+		cfg0.intr_ded_ena = -1;		/* Done, re-arm */
+	}
+
+	writeq(cfg0.u64, lmc_base + LMC_MEM_CFG0);
+}
+
+static int __devinit co_lmc_probe(struct platform_device *pdev)
+{
+	struct mem_ctl_info *mci;
+	union lmc_mem_cfg0 cfg0;
+	int res = 0;
+
+	mci = edac_mc_alloc(0, 0, 0, 0);
+	if (!mci)
+		return -ENOMEM;
+
+	mci->pdev = &pdev->dev;
+	platform_set_drvdata(pdev, mci);
+	mci->dev_name = dev_name(&pdev->dev);
+
+	mci->mod_name = "octeon-lmc";
+	mci->ctl_name = "co_lmc_err";
+	mci->edac_check = co_lmc_poll;
+
+	if (edac_mc_add_mc(mci) > 0) {
+		pr_err("%s: edac_mc_add_mc() failed\n", __func__);
+		goto err;
+	}
+
+	cfg0.u64 = readq(lmc_base + LMC_MEM_CFG0);	/* We poll */
+	cfg0.intr_ded_ena = 0;
+	cfg0.intr_sec_ena = 0;
+	writeq(cfg0.u64, lmc_base + LMC_MEM_CFG0);
+
+	mc_cavium = mci;
+
+	return 0;
+
+err:
+	edac_mc_free(mci);
+
+	return res;
+}
+
+static int co_lmc_remove(struct platform_device *pdev)
+{
+	struct mem_ctl_info *mci = platform_get_drvdata(pdev);
+
+	mc_cavium = NULL;
+	edac_mc_del_mc(&pdev->dev);
+	edac_mc_free(mci);
+
+	return 0;
+}
+
+static struct platform_driver co_lmc_driver = {
+	.probe = co_lmc_probe,
+	.remove = co_lmc_remove,
+	.driver = {
+		   .name = "co_lmc_edac",
+	}
+};
+
+static int __init co_edac_init(void)
+{
+	union lmc_mem_cfg0 cfg0;
+	int ret;
+
+	lmc_base = ioremap_nocache(LMC_BASE, LMC_SIZE);
+	if (!lmc_base)
+		return -ENOMEM;
+
+	cfg0.u64 = readq(lmc_base + LMC_MEM_CFG0);
+	if (!cfg0.ecc_ena) {
+		pr_info(EDAC_MOD_STR " LMC EDAC: ECC disabled, good bye\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = platform_driver_register(&co_lmc_driver);
+	if (ret) {
+		pr_warning(EDAC_MOD_STR " LMC EDAC failed to register\n");
+		goto out;
+	}
+
+	return ret;
+
+out:
+	iounmap(lmc_base);
+
+	return ret;
+}
+
+static void __exit co_edac_exit(void)
+{
+	platform_driver_unregister(&co_lmc_driver);
+	iounmap(lmc_base);
+}
+
+module_init(co_edac_init);
+module_exit(co_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");

drivers/edac/octeon_edac-lmc.h

+/*
+ * LMC Registers, see chapter 2.5
+ *
+ * These are RSL Type registers and are accessed indirectly across the
+ * I/O bus, so accesses are slowish.  Not that it matters.  Any size load is
+ * ok but stores must be 64-bit.
+ */
+#define LMC_BASE		0x0001180088000000
+#define LMC_SIZE		0xb8
+
+#define LMC_MEM_CFG0		0x0000000000000000
+#define LMC_MEM_CFG1		0x0000000000000008
+#define LMC_CTL			0x0000000000000010
+#define LMC_DDR2_CTL		0x0000000000000018
+#define LMC_FADR		0x0000000000000020
+#define   LMC_FADR_FDIMM
+#define   LMC_FADR_FBUNK
+#define   LMC_FADR_FBANK
+#define   LMC_FADR_FROW
+#define   LMC_FADR_FCOL
+#define LMC_COMP_CTL		0x0000000000000028
+#define LMC_WODT_CTL		0x0000000000000030
+#define LMC_ECC_SYND		0x0000000000000038
+#define LMC_IFB_CNT_LO		0x0000000000000048
+#define LMC_IFB_CNT_HI		0x0000000000000050
+#define LMC_OPS_CNT_LO		0x0000000000000058
+#define LMC_OPS_CNT_HI		0x0000000000000060
+#define LMC_DCLK_CNT_LO		0x0000000000000068
+#define LMC_DCLK_CNT_HI		0x0000000000000070
+#define LMC_DELAY_CFG		0x0000000000000088
+#define LMC_CTL1		0x0000000000000090
+#define LMC_DUAL_MEM_CONFIG	0x0000000000000098
+#define LMC_RODT_COMP_CTL	0x00000000000000A0
+#define LMC_PLL_CTL		0x00000000000000A8
+#define LMC_PLL_STATUS		0x00000000000000B0
+
+union lmc_mem_cfg0 {
+	uint64_t u64;
+	struct {
+		uint64_t reserved_32_63:32;
+		uint64_t reset:1;
+		uint64_t silo_qc:1;
+		uint64_t bunk_ena:1;
+		uint64_t ded_err:4;
+		uint64_t sec_err:4;
+		uint64_t intr_ded_ena:1;
+		uint64_t intr_sec_ena:1;
+		uint64_t reserved_15_18:4;
+		uint64_t ref_int:5;
+		uint64_t pbank_lsb:4;
+		uint64_t row_lsb:3;
+		uint64_t ecc_ena:1;
+		uint64_t init_start:1;
+	};
+};
+
+union lmc_fadr {
+	uint64_t u64;
+	struct {
+		uint64_t reserved_32_63:32;
+		uint64_t fdimm:2;
+		uint64_t fbunk:1;
+		uint64_t fbank:3;
+		uint64_t frow:14;
+		uint64_t fcol:12;
+	};
+};
+
+union lmc_ecc_synd {
+	uint64_t u64;
+	struct {
+		uint64_t reserved_32_63:32;
+		uint64_t mrdsyn3:8;
+		uint64_t mrdsyn2:8;
+		uint64_t mrdsyn1:8;
+		uint64_t mrdsyn0:8;
+	};
+};

drivers/edac/octeon_edac-pc.c

+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Wind River Systems,
+ *   written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/edac.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+
+#include <asm/octeon/cvmx.h>
+#include <asm/mipsregs.h>
+
+#define EDAC_MOD_STR "octeon"
+
+extern int register_co_cache_error_notifier(struct notifier_block *nb);
+extern int unregister_co_cache_error_notifier(struct notifier_block *nb);
+
+extern unsigned long long cache_err_dcache[NR_CPUS];
+
+static struct edac_device_ctl_info *ed_cavium;
+
+/*
+ * EDAC CPU cache error callback
+ *
+ */
+
+static int  co_cache_error_event(struct notifier_block *this,
+	unsigned long event, void *ptr)
+{
+	unsigned int core = cvmx_get_core_num();
+	unsigned int cpu = smp_processor_id();
+	uint64_t icache_err = read_octeon_c0_icacheerr();
+	struct edac_device_ctl_info *ed = ed_cavium;
+
+	edac_device_printk(ed, KERN_ERR,
+			   "Cache error exception on core %d / processor %d:\n",
+			   core, cpu);
+	edac_device_printk(ed, KERN_ERR,
+			   "cp0_errorepc == %lx\n", read_c0_errorepc());
+	if (icache_err & 1) {
+		edac_device_printk(ed, KERN_ERR, "CacheErr (Icache) == %llx\n",
+				   (unsigned long long)icache_err);
+		write_octeon_c0_icacheerr(0);
+		edac_device_handle_ce(ed, 0, 0, ed->ctl_name);
+	}
+	if (cache_err_dcache[core] & 1) {
+		edac_device_printk(ed, KERN_ERR, "CacheErr (Dcache) == %llx\n",
+				   (unsigned long long)cache_err_dcache[core]);
+		cache_err_dcache[core] = 0;
+		edac_device_handle_ue(ed, 0, 0, ed->ctl_name);
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block co_cache_error_notifier = {
+	.notifier_call = co_cache_error_event,
+};
+
+static int __devinit co_cache_error_probe(struct platform_device *pdev)
+{
+	struct edac_device_ctl_info *ed;
+	int res = 0;
+
+	ed = edac_device_alloc_ctl_info(0, "cpu", 1, NULL, 0, 0, NULL, 0,
+					edac_device_alloc_index());
+
+	ed->dev = &pdev->dev;
+	platform_set_drvdata(pdev, ed);
+	ed->dev_name = dev_name(&pdev->dev);
+
+	ed->mod_name = "octeon-cpu";
+	ed->ctl_name = "co_cpu_err";
+
+	if (edac_device_add_device(ed) > 0) {
+		pr_err("%s: edac_device_add_device() failed\n", __func__);
+		goto err;
+	}
+
+	register_co_cache_error_notifier(&co_cache_error_notifier);
+	ed_cavium = ed;
+
+	return 0;
+
+err:
+	edac_device_free_ctl_info(ed);
+
+	return res;
+}
+
+static int co_cache_error_remove(struct platform_device *pdev)
+{
+	struct edac_device_ctl_info *ed = platform_get_drvdata(pdev);
+
+	unregister_co_cache_error_notifier(&co_cache_error_notifier);
+	ed_cavium = NULL;
+	edac_device_del_device(&pdev->dev);
+	edac_device_free_ctl_info(ed);
+
+	return 0;
+}
+
+static struct platform_driver co_cache_error_driver = {
+	.probe = co_cache_error_probe,
+	.remove = co_cache_error_remove,
+	.driver = {
+		   .name = "co_pc_edac",
+	}
+};
+
+static int __init co_edac_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&co_cache_error_driver);
+	if (ret)
+		pr_warning(EDAC_MOD_STR "CPU err failed to register\n");
+
+	return ret;
+}
+
+static void __exit co_edac_exit(void)
+{
+	platform_driver_unregister(&co_cache_error_driver);
+}
+
+module_init(co_edac_init);
+module_exit(co_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");

drivers/edac/octeon_edac-pci.c

+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009 Wind River Systems,
+ *   written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/edac.h>
+
+#include <asm/octeon/cvmx.h>
+#include <asm/octeon/cvmx-npi-defs.h>
+#include <asm/octeon/cvmx-pci-defs.h>
+#include <asm/octeon/octeon.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+
+#define EDAC_MOD_STR "octeon"
+
+static void co_pci_poll(struct edac_pci_ctl_info *pci)
+{
+	union cvmx_pci_cfg01 cfg01;
+
+	cfg01.u32 = octeon_npi_read32(CVMX_NPI_PCI_CFG01);
+	if (cfg01.s.dpe) {		/* Detected parity error */
+		edac_pci_handle_pe(pci, pci->ctl_name);
+		cfg01.s.dpe = 1;		/* Reset  */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+	if (cfg01.s.sse) {
+		edac_pci_handle_npe(pci, "Signaled System Error");
+		cfg01.s.sse = 1;		/* Reset */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+	if (cfg01.s.rma) {
+		edac_pci_handle_npe(pci, "Received Master Abort");
+		cfg01.s.rma = 1;		/* Reset */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+	if (cfg01.s.rta) {
+		edac_pci_handle_npe(pci, "Received Target Abort");
+		cfg01.s.rta = 1;		/* Reset */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+	if (cfg01.s.sta) {
+		edac_pci_handle_npe(pci, "Signaled Target Abort");
+		cfg01.s.sta = 1;		/* Reset */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+	if (cfg01.s.mdpe) {
+		edac_pci_handle_npe(pci, "Master Data Parity Error");
+		cfg01.s.mdpe = 1;		/* Reset */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+	if (cfg01.s.mdpe) {
+		edac_pci_handle_npe(pci, "Master Data Parity Error");
+		cfg01.s.mdpe = 1;		/* Reset */
+		octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);
+	}
+}
+
+static int __devinit co_pci_probe(struct platform_device *pdev)
+{
+	struct edac_pci_ctl_info *pci;
+	int res = 0;
+
+	pci = edac_pci_alloc_ctl_info(0, "octeon_pci_err");
+	if (!pci)
+		return -ENOMEM;
+
+	pci->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pci);
+	pci->dev_name = dev_name(&pdev->dev);
+
+	pci->mod_name = "octeon-pci";
+	pci->ctl_name = "octeon_pci_err";
+	pci->edac_check = co_pci_poll;
+
+	if (edac_pci_add_device(pci, 0) > 0) {
+		pr_err("%s: edac_pci_add_device() failed\n", __func__);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	edac_pci_free_ctl_info(pci);
+
+	return res;
+}
+
+static int co_pci_remove(struct platform_device *pdev)
+{
+	struct edac_pci_ctl_info *pci = platform_get_drvdata(pdev);
+
+	edac_pci_del_device(&pdev->dev);
+	edac_pci_free_ctl_info(pci);
+
+	return 0;
+}
+
+static struct platform_driver co_pci_driver = {
+	.probe = co_pci_probe,
+	.remove = co_pci_remove,
+	.driver = {
+		   .name = "co_pci_edac",
+	}
+};
+
+static int __init co_edac_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&co_pci_driver);
+	if (ret)
+		pr_warning(EDAC_MOD_STR " PCI EDAC failed to register\n");
+
+	return ret;
+}
+
+static void __exit co_edac_exit(void)
+{
+	platform_driver_unregister(&co_pci_driver);
+}
+
+module_init(co_edac_init);
+module_exit(co_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");