1 /* 2 * Copyright 2011 Freescale Semiconductor, Inc 3 * 4 * Freescale Integrated Flash Controller 5 * 6 * Author: Dipen Dudhat <Dipen.Dudhat@freescale.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/compiler.h> 25 #include <linux/spinlock.h> 26 #include <linux/types.h> 27 #include <linux/slab.h> 28 #include <linux/io.h> 29 #include <linux/of.h> 30 #include <linux/of_device.h> 31 #include <linux/platform_device.h> 32 #include <linux/fsl_ifc.h> 33 #include <asm/prom.h> 34 35 struct fsl_ifc_ctrl *fsl_ifc_ctrl_dev; 36 EXPORT_SYMBOL(fsl_ifc_ctrl_dev); 37 38 /* 39 * convert_ifc_address - convert the base address 40 * @addr_base: base address of the memory bank 41 */ 42 unsigned int convert_ifc_address(phys_addr_t addr_base) 43 { 44 return addr_base & CSPR_BA; 45 } 46 EXPORT_SYMBOL(convert_ifc_address); 47 48 /* 49 * fsl_ifc_find - find IFC bank 50 * @addr_base: base address of the memory bank 51 * 52 * This function walks IFC banks comparing "Base address" field of the CSPR 53 * registers with the supplied addr_base argument. When bases match this 54 * function returns bank number (starting with 0), otherwise it returns 55 * appropriate errno value. 56 */ 57 int fsl_ifc_find(phys_addr_t addr_base) 58 { 59 int i = 0; 60 61 if (!fsl_ifc_ctrl_dev || !fsl_ifc_ctrl_dev->regs) 62 return -ENODEV; 63 64 for (i = 0; i < fsl_ifc_ctrl_dev->banks; i++) { 65 u32 cspr = in_be32(&fsl_ifc_ctrl_dev->regs->cspr_cs[i].cspr); 66 if (cspr & CSPR_V && (cspr & CSPR_BA) == 67 convert_ifc_address(addr_base)) 68 return i; 69 } 70 71 return -ENOENT; 72 } 73 EXPORT_SYMBOL(fsl_ifc_find); 74 75 static int fsl_ifc_ctrl_init(struct fsl_ifc_ctrl *ctrl) 76 { 77 struct fsl_ifc_regs __iomem *ifc = ctrl->regs; 78 79 /* 80 * Clear all the common status and event registers 81 */ 82 if (in_be32(&ifc->cm_evter_stat) & IFC_CM_EVTER_STAT_CSER) 83 out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER); 84 85 /* enable all error and events */ 86 out_be32(&ifc->cm_evter_en, IFC_CM_EVTER_EN_CSEREN); 87 88 /* enable all error and event interrupts */ 89 out_be32(&ifc->cm_evter_intr_en, IFC_CM_EVTER_INTR_EN_CSERIREN); 90 out_be32(&ifc->cm_erattr0, 0x0); 91 out_be32(&ifc->cm_erattr1, 0x0); 92 93 return 0; 94 } 95 96 static int fsl_ifc_ctrl_remove(struct platform_device *dev) 97 { 98 struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(&dev->dev); 99 100 free_irq(ctrl->nand_irq, ctrl); 101 free_irq(ctrl->irq, ctrl); 102 103 irq_dispose_mapping(ctrl->nand_irq); 104 irq_dispose_mapping(ctrl->irq); 105 106 iounmap(ctrl->regs); 107 108 dev_set_drvdata(&dev->dev, NULL); 109 kfree(ctrl); 110 111 return 0; 112 } 113 114 /* 115 * NAND events are split between an operational interrupt which only 116 * receives OPC, and an error interrupt that receives everything else, 117 * including non-NAND errors. Whichever interrupt gets to it first 118 * records the status and wakes the wait queue. 119 */ 120 static DEFINE_SPINLOCK(nand_irq_lock); 121 122 static u32 check_nand_stat(struct fsl_ifc_ctrl *ctrl) 123 { 124 struct fsl_ifc_regs __iomem *ifc = ctrl->regs; 125 unsigned long flags; 126 u32 stat; 127 128 spin_lock_irqsave(&nand_irq_lock, flags); 129 130 stat = in_be32(&ifc->ifc_nand.nand_evter_stat); 131 if (stat) { 132 out_be32(&ifc->ifc_nand.nand_evter_stat, stat); 133 ctrl->nand_stat = stat; 134 wake_up(&ctrl->nand_wait); 135 } 136 137 spin_unlock_irqrestore(&nand_irq_lock, flags); 138 139 return stat; 140 } 141 142 static irqreturn_t fsl_ifc_nand_irq(int irqno, void *data) 143 { 144 struct fsl_ifc_ctrl *ctrl = data; 145 146 if (check_nand_stat(ctrl)) 147 return IRQ_HANDLED; 148 149 return IRQ_NONE; 150 } 151 152 /* 153 * NOTE: This interrupt is used to report ifc events of various kinds, 154 * such as transaction errors on the chipselects. 155 */ 156 static irqreturn_t fsl_ifc_ctrl_irq(int irqno, void *data) 157 { 158 struct fsl_ifc_ctrl *ctrl = data; 159 struct fsl_ifc_regs __iomem *ifc = ctrl->regs; 160 u32 err_axiid, err_srcid, status, cs_err, err_addr; 161 irqreturn_t ret = IRQ_NONE; 162 163 /* read for chip select error */ 164 cs_err = in_be32(&ifc->cm_evter_stat); 165 if (cs_err) { 166 dev_err(ctrl->dev, "transaction sent to IFC is not mapped to" 167 "any memory bank 0x%08X\n", cs_err); 168 /* clear the chip select error */ 169 out_be32(&ifc->cm_evter_stat, IFC_CM_EVTER_STAT_CSER); 170 171 /* read error attribute registers print the error information */ 172 status = in_be32(&ifc->cm_erattr0); 173 err_addr = in_be32(&ifc->cm_erattr1); 174 175 if (status & IFC_CM_ERATTR0_ERTYP_READ) 176 dev_err(ctrl->dev, "Read transaction error" 177 "CM_ERATTR0 0x%08X\n", status); 178 else 179 dev_err(ctrl->dev, "Write transaction error" 180 "CM_ERATTR0 0x%08X\n", status); 181 182 err_axiid = (status & IFC_CM_ERATTR0_ERAID) >> 183 IFC_CM_ERATTR0_ERAID_SHIFT; 184 dev_err(ctrl->dev, "AXI ID of the error" 185 "transaction 0x%08X\n", err_axiid); 186 187 err_srcid = (status & IFC_CM_ERATTR0_ESRCID) >> 188 IFC_CM_ERATTR0_ESRCID_SHIFT; 189 dev_err(ctrl->dev, "SRC ID of the error" 190 "transaction 0x%08X\n", err_srcid); 191 192 dev_err(ctrl->dev, "Transaction Address corresponding to error" 193 "ERADDR 0x%08X\n", err_addr); 194 195 ret = IRQ_HANDLED; 196 } 197 198 if (check_nand_stat(ctrl)) 199 ret = IRQ_HANDLED; 200 201 return ret; 202 } 203 204 /* 205 * fsl_ifc_ctrl_probe 206 * 207 * called by device layer when it finds a device matching 208 * one our driver can handled. This code allocates all of 209 * the resources needed for the controller only. The 210 * resources for the NAND banks themselves are allocated 211 * in the chip probe function. 212 */ 213 static int fsl_ifc_ctrl_probe(struct platform_device *dev) 214 { 215 int ret = 0; 216 int version, banks; 217 218 dev_info(&dev->dev, "Freescale Integrated Flash Controller\n"); 219 220 fsl_ifc_ctrl_dev = kzalloc(sizeof(*fsl_ifc_ctrl_dev), GFP_KERNEL); 221 if (!fsl_ifc_ctrl_dev) 222 return -ENOMEM; 223 224 dev_set_drvdata(&dev->dev, fsl_ifc_ctrl_dev); 225 226 /* IOMAP the entire IFC region */ 227 fsl_ifc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0); 228 if (!fsl_ifc_ctrl_dev->regs) { 229 dev_err(&dev->dev, "failed to get memory region\n"); 230 ret = -ENODEV; 231 goto err; 232 } 233 234 version = ioread32be(&fsl_ifc_ctrl_dev->regs->ifc_rev) & 235 FSL_IFC_VERSION_MASK; 236 banks = (version == FSL_IFC_VERSION_1_0_0) ? 4 : 8; 237 dev_info(&dev->dev, "IFC version %d.%d, %d banks\n", 238 version >> 24, (version >> 16) & 0xf, banks); 239 240 fsl_ifc_ctrl_dev->version = version; 241 fsl_ifc_ctrl_dev->banks = banks; 242 243 /* get the Controller level irq */ 244 fsl_ifc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0); 245 if (fsl_ifc_ctrl_dev->irq == NO_IRQ) { 246 dev_err(&dev->dev, "failed to get irq resource " 247 "for IFC\n"); 248 ret = -ENODEV; 249 goto err; 250 } 251 252 /* get the nand machine irq */ 253 fsl_ifc_ctrl_dev->nand_irq = 254 irq_of_parse_and_map(dev->dev.of_node, 1); 255 256 fsl_ifc_ctrl_dev->dev = &dev->dev; 257 258 ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev); 259 if (ret < 0) 260 goto err; 261 262 init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait); 263 264 ret = request_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_irq, IRQF_SHARED, 265 "fsl-ifc", fsl_ifc_ctrl_dev); 266 if (ret != 0) { 267 dev_err(&dev->dev, "failed to install irq (%d)\n", 268 fsl_ifc_ctrl_dev->irq); 269 goto err_irq; 270 } 271 272 if (fsl_ifc_ctrl_dev->nand_irq) { 273 ret = request_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_nand_irq, 274 0, "fsl-ifc-nand", fsl_ifc_ctrl_dev); 275 if (ret != 0) { 276 dev_err(&dev->dev, "failed to install irq (%d)\n", 277 fsl_ifc_ctrl_dev->nand_irq); 278 goto err_nandirq; 279 } 280 } 281 282 return 0; 283 284 err_nandirq: 285 free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev); 286 irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq); 287 err_irq: 288 free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev); 289 irq_dispose_mapping(fsl_ifc_ctrl_dev->irq); 290 err: 291 return ret; 292 } 293 294 static const struct of_device_id fsl_ifc_match[] = { 295 { 296 .compatible = "fsl,ifc", 297 }, 298 {}, 299 }; 300 301 static struct platform_driver fsl_ifc_ctrl_driver = { 302 .driver = { 303 .name = "fsl-ifc", 304 .of_match_table = fsl_ifc_match, 305 }, 306 .probe = fsl_ifc_ctrl_probe, 307 .remove = fsl_ifc_ctrl_remove, 308 }; 309 310 static int __init fsl_ifc_init(void) 311 { 312 return platform_driver_register(&fsl_ifc_ctrl_driver); 313 } 314 subsys_initcall(fsl_ifc_init); 315 316 MODULE_LICENSE("GPL"); 317 MODULE_AUTHOR("Freescale Semiconductor"); 318 MODULE_DESCRIPTION("Freescale Integrated Flash Controller driver"); 319