[PATCH] edac: r82600: remove unused driver

Ethan Nelson-Moore
2026-01-30T07:12:48Z

This driver supports the Radisys 82600 embedded chipset, which was used
with Pentium III-era CPUs. It is highly unlikely that it is still used.
Besides its own documentation, the only information I was able to find
about the R82600, after looking through many pages of Google results,
was that it was used in a Nokia 2G GSM base station. Remove its driver
and add an entry for it to CREDITS.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
---
NOTE: this patch depends on my previous patch to remove i82443bxgx,
because it modifies the CREDITS entry that patch introduces.

CREDITS | 1 +
MAINTAINERS | 6 -
drivers/edac/Kconfig | 7 -
drivers/edac/Makefile | 1 -
drivers/edac/r82600_edac.c | 426 -------------------------------------
5 files changed, 1 insertion(+), 440 deletions(-)
delete mode 100644 drivers/edac/r82600_edac.c

diff --git a/CREDITS b/CREDITS
index 86276baea6ac..34f9748250d2 100644
--- a/CREDITS
+++ b/CREDITS
@@ -3774,6 +3774,7 @@ S: Australia
N: Tim Small
E: tim@buttersideup.com
D: Intel 82443BX/GX (440BX/GX chipset) EDAC driver
+D: Radisys 82600 embedded chipset EDAC driver

N: Stephen Smalley
E: sds@tycho.nsa.gov
diff --git a/MAINTAINERS b/MAINTAINERS
index 0bc1a7de24d9..83f6b570453d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9150,12 +9150,6 @@ L: linux-edac@vger.kernel.org
S: Maintained
F: drivers/edac/qcom_edac.c

-EDAC-R82600
-M: Tim Small <tim@buttersideup.com>
-L: linux-edac@vger.kernel.org
-S: Maintained
-F: drivers/edac/r82600_edac.c
-
EDAC-SBRIDGE
M: Tony Luck <tony.luck@intel.com>
R: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index b1dfb657f1b2..a44b85c440ca 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -215,13 +215,6 @@ config EDAC_I82860
Support for error detection and correction on the Intel
82860 chipset.

-config EDAC_R82600
- tristate "Radisys 82600 embedded chipset"
- depends on PCI && X86_32
- help
- Support for error detection and correction on the Radisys
- 82600 embedded chipset.
-
config EDAC_I5000
tristate "Intel Greencreek/Blackford chipset"
depends on X86 && PCI
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 4f6a46321b32..a37534300ab9 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -45,7 +45,6 @@ obj-$(CONFIG_EDAC_I3200) += i3200_edac.o
obj-$(CONFIG_EDAC_IE31200) += ie31200_edac.o
obj-$(CONFIG_EDAC_X38) += x38_edac.o
obj-$(CONFIG_EDAC_I82860) += i82860_edac.o
-obj-$(CONFIG_EDAC_R82600) += r82600_edac.o
obj-$(CONFIG_EDAC_AMD64) += amd64_edac.o

obj-$(CONFIG_EDAC_PASEMI) += pasemi_edac.o
diff --git a/drivers/edac/r82600_edac.c b/drivers/edac/r82600_edac.c
deleted file mode 100644
index 61e979d5437a..000000000000
--- a/drivers/edac/r82600_edac.c
+++ /dev/null
@@ -1,426 +0,0 @@
-/*
- * 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_module.h"
-
-#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 bool 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->pdev);
- 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_error(HW_EVENT_ERR_CORRECTED, mci, 1,
- page, 0, syndrome,
- edac_mc_find_csrow_by_page(mci, page),
- 0, -1,
- mci->ctl_name, "");
- }
-
- if (info->eapr & BIT(1)) { /* UE? */
- error_found = 1;
-
- if (handle_errors)
- /* 82600 doesn't give enough info */
- edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
- page, 0, 0,
- edac_mc_find_csrow_by_page(mci, page),
- 0, -1,
- mci->ctl_name, "");
- }
-
- return error_found;
-}
-
-static void r82600_check(struct mem_ctl_info *mci)
-{
- struct r82600_error_info info;
-
- 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;
- struct dimm_info *dimm;
- 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];
- dimm = csrow->channels[0]->dimm;
-
- /* find the DRAM Chip Select Base address and mask */
- pci_read_config_byte(pdev, R82600_DRBA + index, &drbar);
-
- edac_dbg(1, "Row=%d DRBA = %#0x\n", index, drbar);
-
- row_high_limit = ((u32) drbar << 24);
-/* row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
-
- edac_dbg(1, "Row=%d, Boundary Address=%#0x, Last = %#0x\n",
- 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;
-
- dimm->nr_pages = csrow->last_page - csrow->first_page + 1;
- /* Error address is top 19 bits - so granularity is *
- * 14 bits */
- dimm->grain = 1 << 14;
- dimm->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
- /* FIXME - check that this is unknowable with this chipset */
- dimm->dtype = DEV_UNKNOWN;
-
- /* Mode is global on 82600 */
- dimm->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;
- struct edac_mc_layer layers[2];
- u8 dramcr;
- u32 eapr;
- u32 scrub_disabled;
- u32 sdram_refresh_rate;
- struct r82600_error_info discard;
-
- edac_dbg(0, "\n");
- 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));
- edac_dbg(2, "sdram refresh rate = %#0x\n", sdram_refresh_rate);
- edac_dbg(2, "DRAMC register = %#0x\n", dramcr);
- layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
- layers[0].size = R82600_NR_CSROWS;
- layers[0].is_virt_csrow = true;
- layers[1].type = EDAC_MC_LAYER_CHANNEL;
- layers[1].size = R82600_NR_CHANS;
- 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 | 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)
- edac_dbg(3, "mci = %p - Scrubbing disabled! EAP: %#0x\n",
- mci, eapr);
- } else
- mci->edac_cap = EDAC_FLAG_NONE;
-
- mci->mod_name = EDAC_MOD_STR;
- 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)) {
- edac_dbg(3, "failed edac_mc_add_mc()\n");
- goto fail;
- }
-
- /* get this far and it's successful */
-
- if (disable_hardware_scrub) {
- edac_dbg(3, "Disabling Hardware Scrub (scrub on error)\n");
- 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__);
- }
-
- edac_dbg(3, "success\n");
- return 0;
-
-fail:
- edac_mc_free(mci);
- return -ENODEV;
-}
-
-/* returns count (>= 0), or negative on error */
-static int r82600_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 r82600_probe1(pdev, ent->driver_data);
-}
-
-static void r82600_remove_one(struct pci_dev *pdev)
-{
- struct mem_ctl_info *mci;
-
- edac_dbg(0, "\n");
-
- 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[] = {
- {
- 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 = 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");
--
2.43.0