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/of.h> 11 #include <linux/of_device.h> 12 #include <linux/platform_device.h> 13 #include <linux/uaccess.h> 14 15 #include "edac_module.h" 16 17 /* DDR Ctrlr Error Registers */ 18 19 #define HB_DDR_ECC_ERR_BASE 0x128 20 #define MW_DDR_ECC_ERR_BASE 0x1b4 21 22 #define HB_DDR_ECC_OPT 0x00 23 #define HB_DDR_ECC_U_ERR_ADDR 0x08 24 #define HB_DDR_ECC_U_ERR_STAT 0x0c 25 #define HB_DDR_ECC_U_ERR_DATAL 0x10 26 #define HB_DDR_ECC_U_ERR_DATAH 0x14 27 #define HB_DDR_ECC_C_ERR_ADDR 0x18 28 #define HB_DDR_ECC_C_ERR_STAT 0x1c 29 #define HB_DDR_ECC_C_ERR_DATAL 0x20 30 #define HB_DDR_ECC_C_ERR_DATAH 0x24 31 32 #define HB_DDR_ECC_OPT_MODE_MASK 0x3 33 #define HB_DDR_ECC_OPT_FWC 0x100 34 #define HB_DDR_ECC_OPT_XOR_SHIFT 16 35 36 /* DDR Ctrlr Interrupt Registers */ 37 38 #define HB_DDR_ECC_INT_BASE 0x180 39 #define MW_DDR_ECC_INT_BASE 0x218 40 41 #define HB_DDR_ECC_INT_STATUS 0x00 42 #define HB_DDR_ECC_INT_ACK 0x04 43 44 #define HB_DDR_ECC_INT_STAT_CE 0x8 45 #define HB_DDR_ECC_INT_STAT_DOUBLE_CE 0x10 46 #define HB_DDR_ECC_INT_STAT_UE 0x20 47 #define HB_DDR_ECC_INT_STAT_DOUBLE_UE 0x40 48 49 struct hb_mc_drvdata { 50 void __iomem *mc_err_base; 51 void __iomem *mc_int_base; 52 }; 53 54 static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id) 55 { 56 struct mem_ctl_info *mci = dev_id; 57 struct hb_mc_drvdata *drvdata = mci->pvt_info; 58 u32 status, err_addr; 59 60 /* Read the interrupt status register */ 61 status = readl(drvdata->mc_int_base + HB_DDR_ECC_INT_STATUS); 62 63 if (status & HB_DDR_ECC_INT_STAT_UE) { 64 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_U_ERR_ADDR); 65 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 66 err_addr >> PAGE_SHIFT, 67 err_addr & ~PAGE_MASK, 0, 68 0, 0, -1, 69 mci->ctl_name, ""); 70 } 71 if (status & HB_DDR_ECC_INT_STAT_CE) { 72 u32 syndrome = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_STAT); 73 syndrome = (syndrome >> 8) & 0xff; 74 err_addr = readl(drvdata->mc_err_base + HB_DDR_ECC_C_ERR_ADDR); 75 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 76 err_addr >> PAGE_SHIFT, 77 err_addr & ~PAGE_MASK, syndrome, 78 0, 0, -1, 79 mci->ctl_name, ""); 80 } 81 82 /* clear the error, clears the interrupt */ 83 writel(status, drvdata->mc_int_base + HB_DDR_ECC_INT_ACK); 84 return IRQ_HANDLED; 85 } 86 87 static void highbank_mc_err_inject(struct mem_ctl_info *mci, u8 synd) 88 { 89 struct hb_mc_drvdata *pdata = mci->pvt_info; 90 u32 reg; 91 92 reg = readl(pdata->mc_err_base + HB_DDR_ECC_OPT); 93 reg &= HB_DDR_ECC_OPT_MODE_MASK; 94 reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC; 95 writel(reg, pdata->mc_err_base + HB_DDR_ECC_OPT); 96 } 97 98 #define to_mci(k) container_of(k, struct mem_ctl_info, dev) 99 100 static ssize_t highbank_mc_inject_ctrl(struct device *dev, 101 struct device_attribute *attr, const char *buf, size_t count) 102 { 103 struct mem_ctl_info *mci = to_mci(dev); 104 u8 synd; 105 106 if (kstrtou8(buf, 16, &synd)) 107 return -EINVAL; 108 109 highbank_mc_err_inject(mci, synd); 110 111 return count; 112 } 113 114 static DEVICE_ATTR(inject_ctrl, S_IWUSR, NULL, highbank_mc_inject_ctrl); 115 116 static struct attribute *highbank_dev_attrs[] = { 117 &dev_attr_inject_ctrl.attr, 118 NULL 119 }; 120 121 ATTRIBUTE_GROUPS(highbank_dev); 122 123 struct hb_mc_settings { 124 int err_offset; 125 int int_offset; 126 }; 127 128 static struct hb_mc_settings hb_settings = { 129 .err_offset = HB_DDR_ECC_ERR_BASE, 130 .int_offset = HB_DDR_ECC_INT_BASE, 131 }; 132 133 static struct hb_mc_settings mw_settings = { 134 .err_offset = MW_DDR_ECC_ERR_BASE, 135 .int_offset = MW_DDR_ECC_INT_BASE, 136 }; 137 138 static const struct of_device_id hb_ddr_ctrl_of_match[] = { 139 { .compatible = "calxeda,hb-ddr-ctrl", .data = &hb_settings }, 140 { .compatible = "calxeda,ecx-2000-ddr-ctrl", .data = &mw_settings }, 141 {}, 142 }; 143 MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match); 144 145 static int highbank_mc_probe(struct platform_device *pdev) 146 { 147 const struct of_device_id *id; 148 const struct hb_mc_settings *settings; 149 struct edac_mc_layer layers[2]; 150 struct mem_ctl_info *mci; 151 struct hb_mc_drvdata *drvdata; 152 struct dimm_info *dimm; 153 struct resource *r; 154 void __iomem *base; 155 u32 control; 156 int irq; 157 int res = 0; 158 159 id = of_match_device(hb_ddr_ctrl_of_match, &pdev->dev); 160 if (!id) 161 return -ENODEV; 162 163 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; 164 layers[0].size = 1; 165 layers[0].is_virt_csrow = true; 166 layers[1].type = EDAC_MC_LAYER_CHANNEL; 167 layers[1].size = 1; 168 layers[1].is_virt_csrow = false; 169 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 170 sizeof(struct hb_mc_drvdata)); 171 if (!mci) 172 return -ENOMEM; 173 174 mci->pdev = &pdev->dev; 175 drvdata = mci->pvt_info; 176 platform_set_drvdata(pdev, mci); 177 178 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) { 179 res = -ENOMEM; 180 goto free; 181 } 182 183 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 184 if (!r) { 185 dev_err(&pdev->dev, "Unable to get mem resource\n"); 186 res = -ENODEV; 187 goto err; 188 } 189 190 if (!devm_request_mem_region(&pdev->dev, r->start, 191 resource_size(r), dev_name(&pdev->dev))) { 192 dev_err(&pdev->dev, "Error while requesting mem region\n"); 193 res = -EBUSY; 194 goto err; 195 } 196 197 base = devm_ioremap(&pdev->dev, r->start, resource_size(r)); 198 if (!base) { 199 dev_err(&pdev->dev, "Unable to map regs\n"); 200 res = -ENOMEM; 201 goto err; 202 } 203 204 settings = id->data; 205 drvdata->mc_err_base = base + settings->err_offset; 206 drvdata->mc_int_base = base + settings->int_offset; 207 208 control = readl(drvdata->mc_err_base + HB_DDR_ECC_OPT) & 0x3; 209 if (!control || (control == 0x2)) { 210 dev_err(&pdev->dev, "No ECC present, or ECC disabled\n"); 211 res = -ENODEV; 212 goto err; 213 } 214 215 mci->mtype_cap = MEM_FLAG_DDR3; 216 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; 217 mci->edac_cap = EDAC_FLAG_SECDED; 218 mci->mod_name = pdev->dev.driver->name; 219 mci->ctl_name = id->compatible; 220 mci->dev_name = dev_name(&pdev->dev); 221 mci->scrub_mode = SCRUB_SW_SRC; 222 223 /* Only a single 4GB DIMM is supported */ 224 dimm = *mci->dimms; 225 dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1; 226 dimm->grain = 8; 227 dimm->dtype = DEV_X8; 228 dimm->mtype = MEM_DDR3; 229 dimm->edac_mode = EDAC_SECDED; 230 231 res = edac_mc_add_mc_with_groups(mci, highbank_dev_groups); 232 if (res < 0) 233 goto err; 234 235 irq = platform_get_irq(pdev, 0); 236 res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler, 237 0, dev_name(&pdev->dev), mci); 238 if (res < 0) { 239 dev_err(&pdev->dev, "Unable to request irq %d\n", irq); 240 goto err2; 241 } 242 243 devres_close_group(&pdev->dev, NULL); 244 return 0; 245 err2: 246 edac_mc_del_mc(&pdev->dev); 247 err: 248 devres_release_group(&pdev->dev, NULL); 249 free: 250 edac_mc_free(mci); 251 return res; 252 } 253 254 static void highbank_mc_remove(struct platform_device *pdev) 255 { 256 struct mem_ctl_info *mci = platform_get_drvdata(pdev); 257 258 edac_mc_del_mc(&pdev->dev); 259 edac_mc_free(mci); 260 } 261 262 static struct platform_driver highbank_mc_edac_driver = { 263 .probe = highbank_mc_probe, 264 .remove_new = highbank_mc_remove, 265 .driver = { 266 .name = "hb_mc_edac", 267 .of_match_table = hb_ddr_ctrl_of_match, 268 }, 269 }; 270 271 module_platform_driver(highbank_mc_edac_driver); 272 273 MODULE_LICENSE("GPL v2"); 274 MODULE_AUTHOR("Calxeda, Inc."); 275 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank"); 276