drivers/edac/highbank_mc_edac.c

   1 /*
   2  * Copyright 2011-2012 Calxeda, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/ctype.h>
  19 #include <linux/edac.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/uaccess.h>
  24
  25 #include "edac_module.h"
  26
  27 /* DDR Ctrlr Error Registers */
  28
  29 #define HB_DDR_ECC_ERR_BASE             0x128
  30 #define MW_DDR_ECC_ERR_BASE             0x1b4
  31
  32 #define HB_DDR_ECC_OPT                  0x00
  33 #define HB_DDR_ECC_U_ERR_ADDR           0x08
  34 #define HB_DDR_ECC_U_ERR_STAT           0x0c
  35 #define HB_DDR_ECC_U_ERR_DATAL          0x10
  36 #define HB_DDR_ECC_U_ERR_DATAH          0x14
  37 #define HB_DDR_ECC_C_ERR_ADDR           0x18
  38 #define HB_DDR_ECC_C_ERR_STAT           0x1c
  39 #define HB_DDR_ECC_C_ERR_DATAL          0x20
  40 #define HB_DDR_ECC_C_ERR_DATAH          0x24
  41
  42 #define HB_DDR_ECC_OPT_MODE_MASK        0x3
  43 #define HB_DDR_ECC_OPT_FWC              0x100
  44 #define HB_DDR_ECC_OPT_XOR_SHIFT        16
  45
  46 /* DDR Ctrlr Interrupt Registers */
  47
  48 #define HB_DDR_ECC_INT_BASE             0x180
  49 #define MW_DDR_ECC_INT_BASE             0x218
  50
  51 #define HB_DDR_ECC_INT_STATUS           0x00
  52 #define HB_DDR_ECC_INT_ACK              0x04
  53
  54 #define HB_DDR_ECC_INT_STAT_CE          0x8
  55 #define HB_DDR_ECC_INT_STAT_DOUBLE_CE   0x10
  56 #define HB_DDR_ECC_INT_STAT_UE          0x20
  57 #define HB_DDR_ECC_INT_STAT_DOUBLE_UE   0x40
  58
  59 struct hb_mc_drvdata {
  60         void __iomem *mc_err_base;
  61         void __iomem *mc_int_base;
  62 };
  63
  64 static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
  65 {
  66         struct mem_ctl_info *mci = dev_id;
  67         struct hb_mc_drvdata *drvdata = mci->pvt_info;
  68         u32 status, err_addr;
  69
  70         /* Read the interrupt status register */
  71         status = readl(drvdata->mc_int_base + HB_DDR_ECC_INT_STATUS);
  72
  73         if (status & HB_DDR_ECC_INT_STAT_UE) {
  74                 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_U_ERR_ADDR);
  75                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
  76                                      err_addr >> PAGE_SHIFT,
  77                                      err_addr & ~PAGE_MASK, 0,
  78                                      0, 0, -1,
  79                                      mci->ctl_name, "");
  80         }
  81         if (status & HB_DDR_ECC_INT_STAT_CE) {
  82                 u32 syndrome = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_STAT);
  83                 syndrome = (syndrome >> 8) & 0xff;
  84                 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_ADDR);
  85                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
  86                                      err_addr >> PAGE_SHIFT,
  87                                      err_addr & ~PAGE_MASK, syndrome,
  88                                      0, 0, -1,
  89                                      mci->ctl_name, "");
  90         }
  91
  92         /* clear the error, clears the interrupt */
  93         writel(status, drvdata->mc_int_base + HB_DDR_ECC_INT_ACK);
  94         return IRQ_HANDLED;
  95 }
  96
  97 static void highbank_mc_err_inject(struct mem_ctl_info *mci, u8 synd)
  98 {
  99         struct hb_mc_drvdata *pdata = mci->pvt_info;
 100         u32 reg;
 101
 102         reg = readl(pdata->mc_err_base + HB_DDR_ECC_OPT);
 103         reg &= HB_DDR_ECC_OPT_MODE_MASK;
 104         reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
 105         writel(reg, pdata->mc_err_base + HB_DDR_ECC_OPT);
 106 }
 107
 108 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 109
 110 static ssize_t highbank_mc_inject_ctrl(struct device *dev,
 111         struct device_attribute *attr, const char *buf, size_t count)
 112 {
 113         struct mem_ctl_info *mci = to_mci(dev);
 114         u8 synd;
 115
 116         if (kstrtou8(buf, 16, &synd))
 117                 return -EINVAL;
 118
 119         highbank_mc_err_inject(mci, synd);
 120
 121         return count;
 122 }
 123
 124 static DEVICE_ATTR(inject_ctrl, S_IWUSR, NULL, highbank_mc_inject_ctrl);
 125
 126 static struct attribute *highbank_dev_attrs[] = {
 127         &dev_attr_inject_ctrl.attr,
 128         NULL
 129 };
 130
 131 ATTRIBUTE_GROUPS(highbank_dev);
 132
 133 struct hb_mc_settings {
 134         int     err_offset;
 135         int     int_offset;
 136 };
 137
 138 static struct hb_mc_settings hb_settings = {
 139         .err_offset = HB_DDR_ECC_ERR_BASE,
 140         .int_offset = HB_DDR_ECC_INT_BASE,
 141 };
 142
 143 static struct hb_mc_settings mw_settings = {
 144         .err_offset = MW_DDR_ECC_ERR_BASE,
 145         .int_offset = MW_DDR_ECC_INT_BASE,
 146 };
 147
 148 static const struct of_device_id hb_ddr_ctrl_of_match[] = {
 149         { .compatible = "calxeda,hb-ddr-ctrl",          .data = &hb_settings },
 150         { .compatible = "calxeda,ecx-2000-ddr-ctrl",    .data = &mw_settings },
 151         {},
 152 };
 153 MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match);
 154
 155 static int highbank_mc_probe(struct platform_device *pdev)
 156 {
 157         const struct of_device_id *id;
 158         const struct hb_mc_settings *settings;
 159         struct edac_mc_layer layers[2];
 160         struct mem_ctl_info *mci;
 161         struct hb_mc_drvdata *drvdata;
 162         struct dimm_info *dimm;
 163         struct resource *r;
 164         void __iomem *base;
 165         u32 control;
 166         int irq;
 167         int res = 0;
 168
 169         id = of_match_device(hb_ddr_ctrl_of_match, &pdev->dev);
 170         if (!id)
 171                 return -ENODEV;
 172
 173         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 174         layers[0].size = 1;
 175         layers[0].is_virt_csrow = true;
 176         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 177         layers[1].size = 1;
 178         layers[1].is_virt_csrow = false;
 179         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
 180                             sizeof(struct hb_mc_drvdata));
 181         if (!mci)
 182                 return -ENOMEM;
 183
 184         mci->pdev = &pdev->dev;
 185         drvdata = mci->pvt_info;
 186         platform_set_drvdata(pdev, mci);
 187
 188         if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
 189                 return -ENOMEM;
 190
 191         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 192         if (!r) {
 193                 dev_err(&pdev->dev, "Unable to get mem resource\n");
 194                 res = -ENODEV;
 195                 goto err;
 196         }
 197
 198         if (!devm_request_mem_region(&pdev->dev, r->start,
 199                                      resource_size(r), dev_name(&pdev->dev))) {
 200                 dev_err(&pdev->dev, "Error while requesting mem region\n");
 201                 res = -EBUSY;
 202                 goto err;
 203         }
 204
 205         base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 206         if (!base) {
 207                 dev_err(&pdev->dev, "Unable to map regs\n");
 208                 res = -ENOMEM;
 209                 goto err;
 210         }
 211
 212         settings = id->data;
 213         drvdata->mc_err_base = base + settings->err_offset;
 214         drvdata->mc_int_base = base + settings->int_offset;
 215
 216         control = readl(drvdata->mc_err_base + HB_DDR_ECC_OPT) & 0x3;
 217         if (!control || (control == 0x2)) {
 218                 dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
 219                 res = -ENODEV;
 220                 goto err;
 221         }
 222
 223         mci->mtype_cap = MEM_FLAG_DDR3;
 224         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 225         mci->edac_cap = EDAC_FLAG_SECDED;
 226         mci->mod_name = pdev->dev.driver->name;
 227         mci->ctl_name = id->compatible;
 228         mci->dev_name = dev_name(&pdev->dev);
 229         mci->scrub_mode = SCRUB_SW_SRC;
 230
 231         /* Only a single 4GB DIMM is supported */
 232         dimm = *mci->dimms;
 233         dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1;
 234         dimm->grain = 8;
 235         dimm->dtype = DEV_X8;
 236         dimm->mtype = MEM_DDR3;
 237         dimm->edac_mode = EDAC_SECDED;
 238
 239         res = edac_mc_add_mc_with_groups(mci, highbank_dev_groups);
 240         if (res < 0)
 241                 goto err;
 242
 243         irq = platform_get_irq(pdev, 0);
 244         res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
 245                                0, dev_name(&pdev->dev), mci);
 246         if (res < 0) {
 247                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
 248                 goto err2;
 249         }
 250
 251         devres_close_group(&pdev->dev, NULL);
 252         return 0;
 253 err2:
 254         edac_mc_del_mc(&pdev->dev);
 255 err:
 256         devres_release_group(&pdev->dev, NULL);
 257         edac_mc_free(mci);
 258         return res;
 259 }
 260
 261 static int highbank_mc_remove(struct platform_device *pdev)
 262 {
 263         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 264
 265         edac_mc_del_mc(&pdev->dev);
 266         edac_mc_free(mci);
 267         return 0;
 268 }
 269
 270 static struct platform_driver highbank_mc_edac_driver = {
 271         .probe = highbank_mc_probe,
 272         .remove = highbank_mc_remove,
 273         .driver = {
 274                 .name = "hb_mc_edac",
 275                 .of_match_table = hb_ddr_ctrl_of_match,
 276         },
 277 };
 278
 279 module_platform_driver(highbank_mc_edac_driver);
 280
 281 MODULE_LICENSE("GPL v2");
 282 MODULE_AUTHOR("Calxeda, Inc.");
 283 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank");