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_core.h"
  26 #include "edac_module.h"
  27
  28 /* DDR Ctrlr Error Registers */
  29
  30 #define HB_DDR_ECC_ERR_BASE             0x128
  31 #define MW_DDR_ECC_ERR_BASE             0x1b4
  32
  33 #define HB_DDR_ECC_OPT                  0x00
  34 #define HB_DDR_ECC_U_ERR_ADDR           0x08
  35 #define HB_DDR_ECC_U_ERR_STAT           0x0c
  36 #define HB_DDR_ECC_U_ERR_DATAL          0x10
  37 #define HB_DDR_ECC_U_ERR_DATAH          0x14
  38 #define HB_DDR_ECC_C_ERR_ADDR           0x18
  39 #define HB_DDR_ECC_C_ERR_STAT           0x1c
  40 #define HB_DDR_ECC_C_ERR_DATAL          0x20
  41 #define HB_DDR_ECC_C_ERR_DATAH          0x24
  42
  43 #define HB_DDR_ECC_OPT_MODE_MASK        0x3
  44 #define HB_DDR_ECC_OPT_FWC              0x100
  45 #define HB_DDR_ECC_OPT_XOR_SHIFT        16
  46
  47 /* DDR Ctrlr Interrupt Registers */
  48
  49 #define HB_DDR_ECC_INT_BASE             0x180
  50 #define MW_DDR_ECC_INT_BASE             0x218
  51
  52 #define HB_DDR_ECC_INT_STATUS           0x00
  53 #define HB_DDR_ECC_INT_ACK              0x04
  54
  55 #define HB_DDR_ECC_INT_STAT_CE          0x8
  56 #define HB_DDR_ECC_INT_STAT_DOUBLE_CE   0x10
  57 #define HB_DDR_ECC_INT_STAT_UE          0x20
  58 #define HB_DDR_ECC_INT_STAT_DOUBLE_UE   0x40
  59
  60 struct hb_mc_drvdata {
  61         void __iomem *mc_err_base;
  62         void __iomem *mc_int_base;
  63 };
  64
  65 static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id)
  66 {
  67         struct mem_ctl_info *mci = dev_id;
  68         struct hb_mc_drvdata *drvdata = mci->pvt_info;
  69         u32 status, err_addr;
  70
  71         /* Read the interrupt status register */
  72         status = readl(drvdata->mc_int_base + HB_DDR_ECC_INT_STATUS);
  73
  74         if (status & HB_DDR_ECC_INT_STAT_UE) {
  75                 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_U_ERR_ADDR);
  76                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
  77                                      err_addr >> PAGE_SHIFT,
  78                                      err_addr & ~PAGE_MASK, 0,
  79                                      0, 0, -1,
  80                                      mci->ctl_name, "");
  81         }
  82         if (status & HB_DDR_ECC_INT_STAT_CE) {
  83                 u32 syndrome = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_STAT);
  84                 syndrome = (syndrome >> 8) & 0xff;
  85                 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_ADDR);
  86                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
  87                                      err_addr >> PAGE_SHIFT,
  88                                      err_addr & ~PAGE_MASK, syndrome,
  89                                      0, 0, -1,
  90                                      mci->ctl_name, "");
  91         }
  92
  93         /* clear the error, clears the interrupt */
  94         writel(status, drvdata->mc_int_base + HB_DDR_ECC_INT_ACK);
  95         return IRQ_HANDLED;
  96 }
  97
  98 static void highbank_mc_err_inject(struct mem_ctl_info *mci, u8 synd)
  99 {
 100         struct hb_mc_drvdata *pdata = mci->pvt_info;
 101         u32 reg;
 102
 103         reg = readl(pdata->mc_err_base + HB_DDR_ECC_OPT);
 104         reg &= HB_DDR_ECC_OPT_MODE_MASK;
 105         reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC;
 106         writel(reg, pdata->mc_err_base + HB_DDR_ECC_OPT);
 107 }
 108
 109 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 110
 111 static ssize_t highbank_mc_inject_ctrl(struct device *dev,
 112         struct device_attribute *attr, const char *buf, size_t count)
 113 {
 114         struct mem_ctl_info *mci = to_mci(dev);
 115         u8 synd;
 116
 117         if (kstrtou8(buf, 16, &synd))
 118                 return -EINVAL;
 119
 120         highbank_mc_err_inject(mci, synd);
 121
 122         return count;
 123 }
 124
 125 static DEVICE_ATTR(inject_ctrl, S_IWUSR, NULL, highbank_mc_inject_ctrl);
 126
 127 struct hb_mc_settings {
 128         int     err_offset;
 129         int     int_offset;
 130 };
 131
 132 static struct hb_mc_settings hb_settings = {
 133         .err_offset = HB_DDR_ECC_ERR_BASE,
 134         .int_offset = HB_DDR_ECC_INT_BASE,
 135 };
 136
 137 static struct hb_mc_settings mw_settings = {
 138         .err_offset = MW_DDR_ECC_ERR_BASE,
 139         .int_offset = MW_DDR_ECC_INT_BASE,
 140 };
 141
 142 static struct of_device_id hb_ddr_ctrl_of_match[] = {
 143         { .compatible = "calxeda,hb-ddr-ctrl",          .data = &hb_settings },
 144         { .compatible = "calxeda,ecx-2000-ddr-ctrl",    .data = &mw_settings },
 145         {},
 146 };
 147 MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match);
 148
 149 static int highbank_mc_probe(struct platform_device *pdev)
 150 {
 151         const struct of_device_id *id;
 152         const struct hb_mc_settings *settings;
 153         struct edac_mc_layer layers[2];
 154         struct mem_ctl_info *mci;
 155         struct hb_mc_drvdata *drvdata;
 156         struct dimm_info *dimm;
 157         struct resource *r;
 158         void __iomem *base;
 159         u32 control;
 160         int irq;
 161         int res = 0;
 162
 163         id = of_match_device(hb_ddr_ctrl_of_match, &pdev->dev);
 164         if (!id)
 165                 return -ENODEV;
 166
 167         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 168         layers[0].size = 1;
 169         layers[0].is_virt_csrow = true;
 170         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 171         layers[1].size = 1;
 172         layers[1].is_virt_csrow = false;
 173         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
 174                             sizeof(struct hb_mc_drvdata));
 175         if (!mci)
 176                 return -ENOMEM;
 177
 178         mci->pdev = &pdev->dev;
 179         drvdata = mci->pvt_info;
 180         platform_set_drvdata(pdev, mci);
 181
 182         if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
 183                 return -ENOMEM;
 184
 185         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 186         if (!r) {
 187                 dev_err(&pdev->dev, "Unable to get mem resource\n");
 188                 res = -ENODEV;
 189                 goto err;
 190         }
 191
 192         if (!devm_request_mem_region(&pdev->dev, r->start,
 193                                      resource_size(r), dev_name(&pdev->dev))) {
 194                 dev_err(&pdev->dev, "Error while requesting mem region\n");
 195                 res = -EBUSY;
 196                 goto err;
 197         }
 198
 199         base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 200         if (!base) {
 201                 dev_err(&pdev->dev, "Unable to map regs\n");
 202                 res = -ENOMEM;
 203                 goto err;
 204         }
 205
 206         settings = id->data;
 207         drvdata->mc_err_base = base + settings->err_offset;
 208         drvdata->mc_int_base = base + settings->int_offset;
 209
 210         control = readl(drvdata->mc_err_base + HB_DDR_ECC_OPT) & 0x3;
 211         if (!control || (control == 0x2)) {
 212                 dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
 213                 res = -ENODEV;
 214                 goto err;
 215         }
 216
 217         mci->mtype_cap = MEM_FLAG_DDR3;
 218         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 219         mci->edac_cap = EDAC_FLAG_SECDED;
 220         mci->mod_name = pdev->dev.driver->name;
 221         mci->mod_ver = "1";
 222         mci->ctl_name = id->compatible;
 223         mci->dev_name = dev_name(&pdev->dev);
 224         mci->scrub_mode = SCRUB_SW_SRC;
 225
 226         /* Only a single 4GB DIMM is supported */
 227         dimm = *mci->dimms;
 228         dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1;
 229         dimm->grain = 8;
 230         dimm->dtype = DEV_X8;
 231         dimm->mtype = MEM_DDR3;
 232         dimm->edac_mode = EDAC_SECDED;
 233
 234         res = edac_mc_add_mc(mci);
 235         if (res < 0)
 236                 goto err;
 237
 238         irq = platform_get_irq(pdev, 0);
 239         res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
 240                                0, dev_name(&pdev->dev), mci);
 241         if (res < 0) {
 242                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
 243                 goto err2;
 244         }
 245
 246         device_create_file(&mci->dev, &dev_attr_inject_ctrl);
 247
 248         devres_close_group(&pdev->dev, NULL);
 249         return 0;
 250 err2:
 251         edac_mc_del_mc(&pdev->dev);
 252 err:
 253         devres_release_group(&pdev->dev, NULL);
 254         edac_mc_free(mci);
 255         return res;
 256 }
 257
 258 static int highbank_mc_remove(struct platform_device *pdev)
 259 {
 260         struct mem_ctl_info *mci = platform_get_drvdata(pdev);
 261
 262         device_remove_file(&mci->dev, &dev_attr_inject_ctrl);
 263         edac_mc_del_mc(&pdev->dev);
 264         edac_mc_free(mci);
 265         return 0;
 266 }
 267
 268 static struct platform_driver highbank_mc_edac_driver = {
 269         .probe = highbank_mc_probe,
 270         .remove = highbank_mc_remove,
 271         .driver = {
 272                 .name = "hb_mc_edac",
 273                 .of_match_table = hb_ddr_ctrl_of_match,
 274         },
 275 };
 276
 277 module_platform_driver(highbank_mc_edac_driver);
 278
 279 MODULE_LICENSE("GPL v2");
 280 MODULE_AUTHOR("Calxeda, Inc.");
 281 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank");