drivers/edac: new pasemi driver

NEW EDAC driver for the memory controllers on PA Semi PA6T-1682M.

Changes since last submission:

* Rebased on top of 2.6.22-rc4-mm2 with the EDAC changes merged there.
* Minor checkpatch.pl cleanups
* Renamed ctl_name
* Added dev_name
* edac_mc.h -> edac_core.h

[akpm@linux-foundation.org: make printk more informative]
Cc: Alan Cox alan@lxorguk.ukuu.org.uk
Signed-off-by: Egor Martovetsky <egor@pasemi.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Doug Thompson <dougthompson@xmission.com
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 298 insertions, 0 deletions

diff --git a/drivers/edac/pasemi_edac.c b/drivers/edac/pasemi_edac.c
new file mode 100644
index 000000000000..4fcf23b61d8e
--- /dev/null
+++ b/drivers/edac/pasemi_edac.c
@@ -0,0 +1,298 @@
+/*
+ * Copyright (C) 2006-2007 PA Semi, Inc
+ *
+ * Author: Egor Martovetsky <egor@pasemi.com>
+ * Maintained by: Olof Johansson <olof@lixom.net>
+ *
+ * Driver for the PWRficient onchip memory controllers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/slab.h>
+#include "edac_core.h"
+
+#define MODULE_NAME "pasemi_edac"
+
+#define MCCFG_MCEN                              0x300
+#define   MCCFG_MCEN_MMC_EN                     0x00000001
+#define MCCFG_ERRCOR                            0x388
+#define   MCCFG_ERRCOR_RNK_FAIL_DET_EN          0x00000100
+#define   MCCFG_ERRCOR_ECC_GEN_EN               0x00000010
+#define   MCCFG_ERRCOR_ECC_CRR_EN               0x00000001
+#define MCCFG_SCRUB                             0x384
+#define   MCCFG_SCRUB_RGLR_SCRB_EN              0x00000001
+#define MCDEBUG_ERRCTL1                         0x728
+#define   MCDEBUG_ERRCTL1_RFL_LOG_EN            0x00080000
+#define   MCDEBUG_ERRCTL1_MBE_LOG_EN            0x00040000
+#define   MCDEBUG_ERRCTL1_SBE_LOG_EN            0x00020000
+#define MCDEBUG_ERRSTA                          0x730
+#define   MCDEBUG_ERRSTA_RFL_STATUS             0x00000004
+#define   MCDEBUG_ERRSTA_MBE_STATUS             0x00000002
+#define   MCDEBUG_ERRSTA_SBE_STATUS             0x00000001
+#define MCDEBUG_ERRCNT1                         0x734
+#define   MCDEBUG_ERRCNT1_SBE_CNT_OVRFLO        0x00000080
+#define MCDEBUG_ERRLOG1A                        0x738
+#define   MCDEBUG_ERRLOG1A_MERR_TYPE_M          0x30000000
+#define   MCDEBUG_ERRLOG1A_MERR_TYPE_NONE       0x00000000
+#define   MCDEBUG_ERRLOG1A_MERR_TYPE_SBE        0x10000000
+#define   MCDEBUG_ERRLOG1A_MERR_TYPE_MBE        0x20000000
+#define   MCDEBUG_ERRLOG1A_MERR_TYPE_RFL        0x30000000
+#define   MCDEBUG_ERRLOG1A_MERR_BA_M            0x00700000
+#define   MCDEBUG_ERRLOG1A_MERR_BA_S            20
+#define   MCDEBUG_ERRLOG1A_MERR_CS_M            0x00070000
+#define   MCDEBUG_ERRLOG1A_MERR_CS_S            16
+#define   MCDEBUG_ERRLOG1A_SYNDROME_M           0x0000ffff
+#define MCDRAM_RANKCFG                          0x114
+#define   MCDRAM_RANKCFG_EN                     0x00000001
+#define   MCDRAM_RANKCFG_TYPE_SIZE_M            0x000001c0
+#define   MCDRAM_RANKCFG_TYPE_SIZE_S            6
+
+#define PASEMI_EDAC_NR_CSROWS                   8
+#define PASEMI_EDAC_NR_CHANS                    1
+#define PASEMI_EDAC_ERROR_GRAIN                 64
+
+static int last_page_in_mmc;
+static int system_mmc_id;
+
+
+static u32 pasemi_edac_get_error_info(struct mem_ctl_info *mci)
+{
+        struct pci_dev *pdev = to_pci_dev(mci->dev);
+        u32 tmp;
+
+        pci_read_config_dword(pdev, MCDEBUG_ERRSTA,
+                              &tmp);
+
+        tmp &= (MCDEBUG_ERRSTA_RFL_STATUS | MCDEBUG_ERRSTA_MBE_STATUS
+                | MCDEBUG_ERRSTA_SBE_STATUS);
+
+        if (tmp) {
+                if (tmp & MCDEBUG_ERRSTA_SBE_STATUS)
+                        pci_write_config_dword(pdev, MCDEBUG_ERRCNT1,
+                                               MCDEBUG_ERRCNT1_SBE_CNT_OVRFLO);
+                pci_write_config_dword(pdev, MCDEBUG_ERRSTA, tmp);
+        }
+
+        return tmp;
+}
+
+static void pasemi_edac_process_error_info(struct mem_ctl_info *mci, u32 errsta)
+{
+        struct pci_dev *pdev = to_pci_dev(mci->dev);
+        u32 errlog1a;
+        u32 cs;
+
+        if (!errsta)
+                return;
+
+        pci_read_config_dword(pdev, MCDEBUG_ERRLOG1A, &errlog1a);
+
+        cs = (errlog1a & MCDEBUG_ERRLOG1A_MERR_CS_M) >>
+                MCDEBUG_ERRLOG1A_MERR_CS_S;
+
+        /* uncorrectable/multi-bit errors */
+        if (errsta & (MCDEBUG_ERRSTA_MBE_STATUS |
+                      MCDEBUG_ERRSTA_RFL_STATUS)) {
+                edac_mc_handle_ue(mci, mci->csrows[cs].first_page, 0,
+                                  cs, mci->ctl_name);
+        }
+
+        /* correctable/single-bit errors */
+        if (errsta & MCDEBUG_ERRSTA_SBE_STATUS) {
+                edac_mc_handle_ce(mci, mci->csrows[cs].first_page, 0,
+                                  0, cs, 0, mci->ctl_name);
+        }
+}
+
+static void pasemi_edac_check(struct mem_ctl_info *mci)
+{
+        u32 errsta;
+
+        errsta = pasemi_edac_get_error_info(mci);
+        if (errsta)
+                pasemi_edac_process_error_info(mci, errsta);
+}
+
+static int pasemi_edac_init_csrows(struct mem_ctl_info *mci,
+                                   struct pci_dev *pdev,
+                                   enum edac_type edac_mode)
+{
+        struct csrow_info *csrow;
+        u32 rankcfg;
+        int index;
+
+        for (index = 0; index < mci->nr_csrows; index++) {
+                csrow = &mci->csrows[index];
+
+                pci_read_config_dword(pdev,
+                                      MCDRAM_RANKCFG + (index * 12),
+                                      &rankcfg);
+
+                if (!(rankcfg & MCDRAM_RANKCFG_EN))
+                        continue;
+
+                switch ((rankcfg & MCDRAM_RANKCFG_TYPE_SIZE_M) >>
+                        MCDRAM_RANKCFG_TYPE_SIZE_S) {
+                case 0:
+                        csrow->nr_pages = 128 << (20 - PAGE_SHIFT);
+                        break;
+                case 1:
+                        csrow->nr_pages = 256 << (20 - PAGE_SHIFT);
+                        break;
+                case 2:
+                case 3:
+                        csrow->nr_pages = 512 << (20 - PAGE_SHIFT);
+                        break;
+                case 4:
+                        csrow->nr_pages = 1024 << (20 - PAGE_SHIFT);
+                        break;
+                case 5:
+                        csrow->nr_pages = 2048 << (20 - PAGE_SHIFT);
+                        break;
+                default:
+                        edac_mc_printk(mci, KERN_ERR,
+                                "Unrecognized Rank Config. rankcfg=%u\n",
+                                rankcfg);
+                        return -EINVAL;
+                }
+
+                csrow->first_page = last_page_in_mmc;
+                csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
+                last_page_in_mmc += csrow->nr_pages;
+                csrow->page_mask = 0;
+                csrow->grain = PASEMI_EDAC_ERROR_GRAIN;
+                csrow->mtype = MEM_DDR;
+                csrow->dtype = DEV_UNKNOWN;
+                csrow->edac_mode = edac_mode;
+        }
+        return 0;
+}
+
+static int __devinit pasemi_edac_probe(struct pci_dev *pdev,
+                const struct pci_device_id *ent)
+{
+        struct mem_ctl_info *mci = NULL;
+        u32 errctl1, errcor, scrub, mcen;
+
+        pci_read_config_dword(pdev, MCCFG_MCEN, &mcen);
+        if (!(mcen & MCCFG_MCEN_MMC_EN))
+                return -ENODEV;
+
+        /*
+         * We should think about enabling other error detection later on
+         */
+
+        pci_read_config_dword(pdev, MCDEBUG_ERRCTL1, &errctl1);
+        errctl1 |= MCDEBUG_ERRCTL1_SBE_LOG_EN |
+                MCDEBUG_ERRCTL1_MBE_LOG_EN |
+                MCDEBUG_ERRCTL1_RFL_LOG_EN;
+        pci_write_config_dword(pdev, MCDEBUG_ERRCTL1, errctl1);
+
+        mci = edac_mc_alloc(0, PASEMI_EDAC_NR_CSROWS, PASEMI_EDAC_NR_CHANS);
+
+        if (mci == NULL)
+                return -ENOMEM;
+
+        pci_read_config_dword(pdev, MCCFG_ERRCOR, &errcor);
+        errcor |= MCCFG_ERRCOR_RNK_FAIL_DET_EN |
+                MCCFG_ERRCOR_ECC_GEN_EN |
+                MCCFG_ERRCOR_ECC_CRR_EN;
+
+        mci->dev = &pdev->dev;
+        mci->mtype_cap = MEM_FLAG_DDR | MEM_FLAG_RDDR;
+        mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
+        mci->edac_cap = (errcor & MCCFG_ERRCOR_ECC_GEN_EN) ?
+                ((errcor & MCCFG_ERRCOR_ECC_CRR_EN) ?
+                 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_EC) :
+                EDAC_FLAG_NONE;
+        mci->mod_name = MODULE_NAME;
+        mci->dev_name = pci_name(pdev);
+        mci->ctl_name = "pasemi,1682m-mc";
+        mci->edac_check = pasemi_edac_check;
+        mci->ctl_page_to_phys = NULL;
+        pci_read_config_dword(pdev, MCCFG_SCRUB, &scrub);
+        mci->scrub_cap = SCRUB_FLAG_HW_PROG | SCRUB_FLAG_HW_SRC;
+        mci->scrub_mode =
+                ((errcor & MCCFG_ERRCOR_ECC_CRR_EN) ? SCRUB_FLAG_HW_SRC : 0) |
+                ((scrub & MCCFG_SCRUB_RGLR_SCRB_EN) ? SCRUB_FLAG_HW_PROG : 0);
+
+        if (pasemi_edac_init_csrows(mci, pdev,
+                                    (mci->edac_cap & EDAC_FLAG_SECDED) ?
+                                    EDAC_SECDED :
+                                    ((mci->edac_cap & EDAC_FLAG_EC) ?
+                                     EDAC_EC : EDAC_NONE)))
+                goto fail;
+
+        /*
+         * Clear status
+         */
+        pasemi_edac_get_error_info(mci);
+
+        if (edac_mc_add_mc(mci, system_mmc_id++))
+                goto fail;
+
+        /* get this far and it's successful */
+        return 0;
+
+fail:
+        edac_mc_free(mci);
+        return -ENODEV;
+}
+
+static void __devexit pasemi_edac_remove(struct pci_dev *pdev)
+{
+        struct mem_ctl_info *mci = edac_mc_del_mc(&pdev->dev);
+
+        if (!mci)
+                return;
+
+        edac_mc_free(mci);
+}
+
+
+static const struct pci_device_id pasemi_edac_pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa00a) },
+};
+
+MODULE_DEVICE_TABLE(pci, pasemi_edac_pci_tbl);
+
+static struct pci_driver pasemi_edac_driver = {
+        .name = MODULE_NAME,
+        .probe = pasemi_edac_probe,
+        .remove = __devexit_p(pasemi_edac_remove),
+        .id_table = pasemi_edac_pci_tbl,
+};
+
+static int __init pasemi_edac_init(void)
+{
+        return pci_register_driver(&pasemi_edac_driver);
+}
+
+static void __exit pasemi_edac_exit(void)
+{
+        pci_unregister_driver(&pasemi_edac_driver);
+}
+
+module_init(pasemi_edac_init);
+module_exit(pasemi_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
+MODULE_DESCRIPTION("MC support for PA Semi PA6T-1682M memory controller");