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 #define HB_DDR_ECC_OPT 0x128 30 #define HB_DDR_ECC_U_ERR_ADDR 0x130 31 #define HB_DDR_ECC_U_ERR_STAT 0x134 32 #define HB_DDR_ECC_U_ERR_DATAL 0x138 33 #define HB_DDR_ECC_U_ERR_DATAH 0x13c 34 #define HB_DDR_ECC_C_ERR_ADDR 0x140 35 #define HB_DDR_ECC_C_ERR_STAT 0x144 36 #define HB_DDR_ECC_C_ERR_DATAL 0x148 37 #define HB_DDR_ECC_C_ERR_DATAH 0x14c 38 #define HB_DDR_ECC_INT_STATUS 0x180 39 #define HB_DDR_ECC_INT_ACK 0x184 40 #define HB_DDR_ECC_U_ERR_ID 0x424 41 #define HB_DDR_ECC_C_ERR_ID 0x428 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 #define HB_DDR_ECC_OPT_MODE_MASK 0x3 49 #define HB_DDR_ECC_OPT_FWC 0x100 50 #define HB_DDR_ECC_OPT_XOR_SHIFT 16 51 52 struct hb_mc_drvdata { 53 void __iomem *mc_vbase; 54 }; 55 56 static irqreturn_t highbank_mc_err_handler(int irq, void *dev_id) 57 { 58 struct mem_ctl_info *mci = dev_id; 59 struct hb_mc_drvdata *drvdata = mci->pvt_info; 60 u32 status, err_addr; 61 62 /* Read the interrupt status register */ 63 status = readl(drvdata->mc_vbase + HB_DDR_ECC_INT_STATUS); 64 65 if (status & HB_DDR_ECC_INT_STAT_UE) { 66 err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_U_ERR_ADDR); 67 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 68 err_addr >> PAGE_SHIFT, 69 err_addr & ~PAGE_MASK, 0, 70 0, 0, -1, 71 mci->ctl_name, ""); 72 } 73 if (status & HB_DDR_ECC_INT_STAT_CE) { 74 u32 syndrome = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_STAT); 75 syndrome = (syndrome >> 8) & 0xff; 76 err_addr = readl(drvdata->mc_vbase + HB_DDR_ECC_C_ERR_ADDR); 77 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 78 err_addr >> PAGE_SHIFT, 79 err_addr & ~PAGE_MASK, syndrome, 80 0, 0, -1, 81 mci->ctl_name, ""); 82 } 83 84 /* clear the error, clears the interrupt */ 85 writel(status, drvdata->mc_vbase + HB_DDR_ECC_INT_ACK); 86 return IRQ_HANDLED; 87 } 88 89 #ifdef CONFIG_EDAC_DEBUG 90 static ssize_t highbank_mc_err_inject_write(struct file *file, 91 const char __user *data, 92 size_t count, loff_t *ppos) 93 { 94 struct mem_ctl_info *mci = file->private_data; 95 struct hb_mc_drvdata *pdata = mci->pvt_info; 96 char buf[32]; 97 size_t buf_size; 98 u32 reg; 99 u8 synd; 100 101 buf_size = min(count, (sizeof(buf)-1)); 102 if (copy_from_user(buf, data, buf_size)) 103 return -EFAULT; 104 buf[buf_size] = 0; 105 106 if (!kstrtou8(buf, 16, &synd)) { 107 reg = readl(pdata->mc_vbase + HB_DDR_ECC_OPT); 108 reg &= HB_DDR_ECC_OPT_MODE_MASK; 109 reg |= (synd << HB_DDR_ECC_OPT_XOR_SHIFT) | HB_DDR_ECC_OPT_FWC; 110 writel(reg, pdata->mc_vbase + HB_DDR_ECC_OPT); 111 } 112 113 return count; 114 } 115 116 static int debugfs_open(struct inode *inode, struct file *file) 117 { 118 file->private_data = inode->i_private; 119 return 0; 120 } 121 122 static const struct file_operations highbank_mc_debug_inject_fops = { 123 .open = debugfs_open, 124 .write = highbank_mc_err_inject_write, 125 .llseek = generic_file_llseek, 126 }; 127 128 static void __devinit highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci) 129 { 130 if (mci->debugfs) 131 debugfs_create_file("inject_ctrl", S_IWUSR, mci->debugfs, mci, 132 &highbank_mc_debug_inject_fops); 133 ; 134 } 135 #else 136 static void __devinit highbank_mc_create_debugfs_nodes(struct mem_ctl_info *mci) 137 {} 138 #endif 139 140 static int __devinit highbank_mc_probe(struct platform_device *pdev) 141 { 142 struct edac_mc_layer layers[2]; 143 struct mem_ctl_info *mci; 144 struct hb_mc_drvdata *drvdata; 145 struct dimm_info *dimm; 146 struct resource *r; 147 u32 control; 148 int irq; 149 int res = 0; 150 151 layers[0].type = EDAC_MC_LAYER_CHIP_SELECT; 152 layers[0].size = 1; 153 layers[0].is_virt_csrow = true; 154 layers[1].type = EDAC_MC_LAYER_CHANNEL; 155 layers[1].size = 1; 156 layers[1].is_virt_csrow = false; 157 mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 158 sizeof(struct hb_mc_drvdata)); 159 if (!mci) 160 return -ENOMEM; 161 162 mci->pdev = &pdev->dev; 163 drvdata = mci->pvt_info; 164 platform_set_drvdata(pdev, mci); 165 166 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) 167 return -ENOMEM; 168 169 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 170 if (!r) { 171 dev_err(&pdev->dev, "Unable to get mem resource\n"); 172 res = -ENODEV; 173 goto err; 174 } 175 176 if (!devm_request_mem_region(&pdev->dev, r->start, 177 resource_size(r), dev_name(&pdev->dev))) { 178 dev_err(&pdev->dev, "Error while requesting mem region\n"); 179 res = -EBUSY; 180 goto err; 181 } 182 183 drvdata->mc_vbase = devm_ioremap(&pdev->dev, 184 r->start, resource_size(r)); 185 if (!drvdata->mc_vbase) { 186 dev_err(&pdev->dev, "Unable to map regs\n"); 187 res = -ENOMEM; 188 goto err; 189 } 190 191 control = readl(drvdata->mc_vbase + HB_DDR_ECC_OPT) & 0x3; 192 if (!control || (control == 0x2)) { 193 dev_err(&pdev->dev, "No ECC present, or ECC disabled\n"); 194 res = -ENODEV; 195 goto err; 196 } 197 198 irq = platform_get_irq(pdev, 0); 199 res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler, 200 0, dev_name(&pdev->dev), mci); 201 if (res < 0) { 202 dev_err(&pdev->dev, "Unable to request irq %d\n", irq); 203 goto err; 204 } 205 206 mci->mtype_cap = MEM_FLAG_DDR3; 207 mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED; 208 mci->edac_cap = EDAC_FLAG_SECDED; 209 mci->mod_name = dev_name(&pdev->dev); 210 mci->mod_ver = "1"; 211 mci->ctl_name = dev_name(&pdev->dev); 212 mci->scrub_mode = SCRUB_SW_SRC; 213 214 /* Only a single 4GB DIMM is supported */ 215 dimm = *mci->dimms; 216 dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1; 217 dimm->grain = 8; 218 dimm->dtype = DEV_X8; 219 dimm->mtype = MEM_DDR3; 220 dimm->edac_mode = EDAC_SECDED; 221 222 res = edac_mc_add_mc(mci); 223 if (res < 0) 224 goto err; 225 226 highbank_mc_create_debugfs_nodes(mci); 227 228 devres_close_group(&pdev->dev, NULL); 229 return 0; 230 err: 231 devres_release_group(&pdev->dev, NULL); 232 edac_mc_free(mci); 233 return res; 234 } 235 236 static int highbank_mc_remove(struct platform_device *pdev) 237 { 238 struct mem_ctl_info *mci = platform_get_drvdata(pdev); 239 240 edac_mc_del_mc(&pdev->dev); 241 edac_mc_free(mci); 242 return 0; 243 } 244 245 static const struct of_device_id hb_ddr_ctrl_of_match[] = { 246 { .compatible = "calxeda,hb-ddr-ctrl", }, 247 {}, 248 }; 249 MODULE_DEVICE_TABLE(of, hb_ddr_ctrl_of_match); 250 251 static struct platform_driver highbank_mc_edac_driver = { 252 .probe = highbank_mc_probe, 253 .remove = highbank_mc_remove, 254 .driver = { 255 .name = "hb_mc_edac", 256 .of_match_table = hb_ddr_ctrl_of_match, 257 }, 258 }; 259 260 module_platform_driver(highbank_mc_edac_driver); 261 262 MODULE_LICENSE("GPL v2"); 263 MODULE_AUTHOR("Calxeda, Inc."); 264 MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank"); 265