drivers/edac/highbank_mc_edac.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2011-2012 Calxeda, Inc.
   4  */
   5 #include <linux/types.h>
   6 #include <linux/kernel.h>
   7 #include <linux/ctype.h>
   8 #include <linux/edac.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/of_platform.h>
  12 #include <linux/uaccess.h>
  13
  14 #include "edac_module.h"
  15
  16 /* DDR Ctrlr Error Registers */
  17
  18 #define HB_DDR_ECC_ERR_BASE             0x128
  19 #define MW_DDR_ECC_ERR_BASE             0x1b4
  20
  21 #define HB_DDR_ECC_OPT                  0x00
  22 #define HB_DDR_ECC_U_ERR_ADDR           0x08
  23 #define HB_DDR_ECC_U_ERR_STAT           0x0c
  24 #define HB_DDR_ECC_U_ERR_DATAL          0x10
  25 #define HB_DDR_ECC_U_ERR_DATAH          0x14
  26 #define HB_DDR_ECC_C_ERR_ADDR           0x18
  27 #define HB_DDR_ECC_C_ERR_STAT           0x1c
  28 #define HB_DDR_ECC_C_ERR_DATAL          0x20
  29 #define HB_DDR_ECC_C_ERR_DATAH          0x24
  30
  31 #define HB_DDR_ECC_OPT_MODE_MASK        0x3
  32 #define HB_DDR_ECC_OPT_FWC              0x100
  33 #define HB_DDR_ECC_OPT_XOR_SHIFT        16
  34
  35 /* DDR Ctrlr Interrupt Registers */
  36
  37 #define HB_DDR_ECC_INT_BASE             0x180
  38 #define MW_DDR_ECC_INT_BASE             0x218
  39
  40 #define HB_DDR_ECC_INT_STATUS           0x00
  41 #define HB_DDR_ECC_INT_ACK              0x04
  42
  43 #define HB_DDR_ECC_INT_STAT_CE          0x8
  44 #define HB_DDR_ECC_INT_STAT_DOUBLE_CE   0x10
  45 #define HB_DDR_ECC_INT_STAT_UE          0x20
  46 #define HB_DDR_ECC_INT_STAT_DOUBLE_UE   0x40
  47
  48 struct hb_mc_drvdata {
  49         void __iomem *mc_err_base;
  50         void __iomem *mc_int_base;
  51 };
  52
  53 static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
  54 {
  55         struct mem_ctl_info *mci = dev_id;
  56         struct hb_mc_drvdata *drvdata = mci->pvt_info;
  57         u32 status, err_addr;
  58
  59         /* Read the interrupt status register */
  60         status = readl(drvdata->mc_int_base + HB_DDR_ECC_INT_STATUS);
  61
  62         if (status & HB_DDR_ECC_INT_STAT_UE) {
  63                 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_U_ERR_ADDR);
  64                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
  65                                      err_addr >> PAGE_SHIFT,
  66                                      err_addr & ~PAGE_MASK, 0,
  67                                      0, 0, -1,
  68                                      mci->ctl_name, "");
  69         }
  70         if (status & HB_DDR_ECC_INT_STAT_CE) {
  71                 u32 syndrome = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_STAT);
  72                 syndrome = (syndrome >> 8) & 0xff;
  73                 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_ADDR);
  74                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
  75                                      err_addr >> PAGE_SHIFT,
  76                                      err_addr & ~PAGE_MASK, syndrome,
  77                                      0, 0, -1,
  78                                      mci->ctl_name, "");
  79         }
  80
  81         /* clear the error, clears the interrupt */
  82         writel(status, drvdata->mc_int_base + HB_DDR_ECC_INT_ACK);
  83         return IRQ_HANDLED;
  84 }
  85
  86 static void highbank_mc_err_inject(struct mem_ctl_info *mci, u8 synd)
  87 {
  88         struct hb_mc_drvdata *pdata = mci->pvt_info;
  89         u32 reg;
  90
  91         reg = readl(pdata->mc_err_base + HB_DDR_ECC_OPT);
  92         reg &= HB_DDR_ECC_OPT_MODE_MASK;
  93         reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
  94         writel(reg, pdata->mc_err_base + HB_DDR_ECC_OPT);
  95 }
  96
  97 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
  98
  99 static ssize_t highbank_mc_inject_ctrl(struct device *dev,
 100         struct device_attribute *attr, const char *buf, size_t count)
 101 {
 102         struct mem_ctl_info *mci = to_mci(dev);
 103         u8 synd;
 104
 105         if (kstrtou8(buf, 16, &synd))
 106                 return -EINVAL;
 107
 108         highbank_mc_err_inject(mci, synd);
 109
 110         return count;
 111 }
 112
 113 static DEVICE_ATTR(inject_ctrl, S_IWUSR, NULL, highbank_mc_inject_ctrl);
 114
 115 static struct attribute *highbank_dev_attrs[] = {
 116         &dev_attr_inject_ctrl.attr,
 117         NULL
 118 };
 119
 120 ATTRIBUTE_GROUPS(highbank_dev);
 121
 122 struct hb_mc_settings {
 123         int     err_offset;
 124         int     int_offset;
 125 };
 126
 127 static struct hb_mc_settings hb_settings = {
 128         .err_offset = HB_DDR_ECC_ERR_BASE,
 129         .int_offset = HB_DDR_ECC_INT_BASE,
 130 };
 131
 132 static struct hb_mc_settings mw_settings = {
 133         .err_offset = MW_DDR_ECC_ERR_BASE,
 134         .int_offset = MW_DDR_ECC_INT_BASE,
 135 };
 136
 137 static const struct of_device_id hb_ddr_ctrl_of_match[] = {
 138         { .compatible = "calxeda,hb-ddr-ctrl",          .data = &hb_settings },
 139         { .compatible = "calxeda,ecx-2000-ddr-ctrl",    .data = &mw_settings },
 140         {},
 141 };
 142 MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match);
 143
 144 static int highbank_mc_probe(struct platform_device *pdev)
 145 {
 146         const struct of_device_id *id;
 147         const struct hb_mc_settings *settings;
 148         struct edac_mc_layer layers[2];
 149         struct mem_ctl_info *mci;
 150         struct hb_mc_drvdata *drvdata;
 151         struct dimm_info *dimm;
 152         struct resource *r;
 153         void __iomem *base;
 154         u32 control;
 155         int irq;
 156         int res = 0;
 157
 158         id = of_match_device(hb_ddr_ctrl_of_match, &pdev->dev);
 159         if (!id)
 160                 return -ENODEV;
 161
 162         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 163         layers[0].size = 1;
 164         layers[0].is_virt_csrow = true;
 165         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 166         layers[1].size = 1;
 167         layers[1].is_virt_csrow = false;
 168         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
 169                             sizeof(struct hb_mc_drvdata));
 170         if (!mci)
 171                 return -ENOMEM;
 172
 173         mci->pdev = &pdev->dev;
 174         drvdata = mci->pvt_info;
 175         platform_set_drvdata(pdev, mci);
 176
 177         if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
 178                 return -ENOMEM;
 179
 180         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 181         if (!r) {
 182                 dev_err(&pdev->dev, "Unable to get mem resource\n");
 183                 res = -ENODEV;
 184                 goto err;
 185         }
 186
 187         if (!devm_request_mem_region(&pdev->dev, r->start,
 188                                      resource_size(r), dev_name(&pdev->dev))) {
 189                 dev_err(&pdev->dev, "Error while requesting mem region\n");
 190                 res = -EBUSY;
 191                 goto err;
 192         }
 193
 194         base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 195         if (!base) {
 196                 dev_err(&pdev->dev, "Unable to map regs\n");
 197                 res = -ENOMEM;
 198                 goto err;
 199         }
 200
 201         settings = id->data;
 202         drvdata->mc_err_base = base + settings->err_offset;
 203         drvdata->mc_int_base = base + settings->int_offset;
 204
 205         control = readl(drvdata->mc_err_base + HB_DDR_ECC_OPT) & 0x3;
 206         if (!control || (control == 0x2)) {
 207                 dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
 208                 res = -ENODEV;
 209                 goto err;
 210         }
 211
 212         mci->mtype_cap = MEM_FLAG_DDR3;
 213         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 214         mci->edac_cap = EDAC_FLAG_SECDED;
 215         mci->mod_name = pdev->dev.driver->name;
 216         mci->ctl_name = id->compatible;
 217         mci->dev_name = dev_name(&pdev->dev);
 218         mci->scrub_mode = SCRUB_SW_SRC;
 219
 220         /* Only a single 4GB DIMM is supported */
 221         dimm = *mci->dimms;
 222         dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1;
 223         dimm->grain = 8;
 224         dimm->dtype = DEV_X8;
 225         dimm->mtype = MEM_DDR3;
 226         dimm->edac_mode = EDAC_SECDED;
 227
 228         res = edac_mc_add_mc_with_groups(mci, highbank_dev_groups);
 229         if (res < 0)
 230                 goto err;
 231
 232         irq = platform_get_irq(pdev, 0);
 233         res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
 234                                0, dev_name(&pdev->dev), mci);
 235         if (res < 0) {
 236                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
 237                 goto err2;
 238         }
 239
 240         devres_close_group(&pdev->dev, NULL);
 241         return 0;
 242 err2:
 243         edac_mc_del_mc(&pdev->dev);
 244 err:
 245         devres_release_group(&pdev->dev, NULL);
 246         edac_mc_free(mci);
 247         return res;
 248 }
 249
 250 static int highbank_mc_remove(struct platform_device *pdev)
 251 {
 252         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 253
 254         edac_mc_del_mc(&pdev->dev);
 255         edac_mc_free(mci);
 256         return 0;
 257 }
 258
 259 static struct platform_driver highbank_mc_edac_driver = {
 260         .probe = highbank_mc_probe,
 261         .remove = highbank_mc_remove,
 262         .driver = {
 263                 .name = "hb_mc_edac",
 264                 .of_match_table = hb_ddr_ctrl_of_match,
 265         },
 266 };
 267
 268 module_platform_driver(highbank_mc_edac_driver);
 269
 270 MODULE_LICENSE("GPL v2");
 271 MODULE_AUTHOR("Calxeda, Inc.");
 272 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank");