1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2011 Freescale Semiconductor, Inc 4 * 5 * Freescale Integrated Flash Controller 6 * 7 * Author: Dipen Dudhat <Dipen.Dudhat@freescale.com> 8 */ 9 #include <linux/module.h> 10 #include <linux/kernel.h> 11 #include <linux/compiler.h> 12 #include <linux/sched.h> 13 #include <linux/spinlock.h> 14 #include <linux/types.h> 15 #include <linux/slab.h> 16 #include <linux/io.h> 17 #include <linux/of.h> 18 #include <linux/of_device.h> 19 #include <linux/platform_device.h> 20 #include <linux/fsl_ifc.h> 21 #include <linux/irqdomain.h> 22 #include <linux/of_address.h> 23 #include <linux/of_irq.h> 24 25 struct fsl_ifc_ctrl *fsl_ifc_ctrl_dev; 26 EXPORT_SYMBOL(fsl_ifc_ctrl_dev); 27 28 /* 29 * convert_ifc_address - convert the base address 30 * @addr_base: base address of the memory bank 31 */ 32 unsigned int convert_ifc_address(phys_addr_t addr_base) 33 { 34 return addr_base & CSPR_BA; 35 } 36 EXPORT_SYMBOL(convert_ifc_address); 37 38 /* 39 * fsl_ifc_find - find IFC bank 40 * @addr_base: base address of the memory bank 41 * 42 * This function walks IFC banks comparing "Base address" field of the CSPR 43 * registers with the supplied addr_base argument. When bases match this 44 * function returns bank number (starting with 0), otherwise it returns 45 * appropriate errno value. 46 */ 47 int fsl_ifc_find(phys_addr_t addr_base) 48 { 49 int i = 0; 50 51 if (!fsl_ifc_ctrl_dev || !fsl_ifc_ctrl_dev->gregs) 52 return -ENODEV; 53 54 for (i = 0; i < fsl_ifc_ctrl_dev->banks; i++) { 55 u32 cspr = ifc_in32(&fsl_ifc_ctrl_dev->gregs->cspr_cs[i].cspr); 56 57 if (cspr & CSPR_V && (cspr & CSPR_BA) == 58 convert_ifc_address(addr_base)) 59 return i; 60 } 61 62 return -ENOENT; 63 } 64 EXPORT_SYMBOL(fsl_ifc_find); 65 66 static int fsl_ifc_ctrl_init(struct fsl_ifc_ctrl *ctrl) 67 { 68 struct fsl_ifc_global __iomem *ifc = ctrl->gregs; 69 70 /* 71 * Clear all the common status and event registers 72 */ 73 if (ifc_in32(&ifc->cm_evter_stat) & IFC_CM_EVTER_STAT_CSER) 74 ifc_out32(IFC_CM_EVTER_STAT_CSER, &ifc->cm_evter_stat); 75 76 /* enable all error and events */ 77 ifc_out32(IFC_CM_EVTER_EN_CSEREN, &ifc->cm_evter_en); 78 79 /* enable all error and event interrupts */ 80 ifc_out32(IFC_CM_EVTER_INTR_EN_CSERIREN, &ifc->cm_evter_intr_en); 81 ifc_out32(0x0, &ifc->cm_erattr0); 82 ifc_out32(0x0, &ifc->cm_erattr1); 83 84 return 0; 85 } 86 87 static int fsl_ifc_ctrl_remove(struct platform_device *dev) 88 { 89 struct fsl_ifc_ctrl *ctrl = dev_get_drvdata(&dev->dev); 90 91 of_platform_depopulate(&dev->dev); 92 free_irq(ctrl->nand_irq, ctrl); 93 free_irq(ctrl->irq, ctrl); 94 95 irq_dispose_mapping(ctrl->nand_irq); 96 irq_dispose_mapping(ctrl->irq); 97 98 iounmap(ctrl->gregs); 99 100 dev_set_drvdata(&dev->dev, NULL); 101 102 return 0; 103 } 104 105 /* 106 * NAND events are split between an operational interrupt which only 107 * receives OPC, and an error interrupt that receives everything else, 108 * including non-NAND errors. Whichever interrupt gets to it first 109 * records the status and wakes the wait queue. 110 */ 111 static DEFINE_SPINLOCK(nand_irq_lock); 112 113 static u32 check_nand_stat(struct fsl_ifc_ctrl *ctrl) 114 { 115 struct fsl_ifc_runtime __iomem *ifc = ctrl->rregs; 116 unsigned long flags; 117 u32 stat; 118 119 spin_lock_irqsave(&nand_irq_lock, flags); 120 121 stat = ifc_in32(&ifc->ifc_nand.nand_evter_stat); 122 if (stat) { 123 ifc_out32(stat, &ifc->ifc_nand.nand_evter_stat); 124 ctrl->nand_stat = stat; 125 wake_up(&ctrl->nand_wait); 126 } 127 128 spin_unlock_irqrestore(&nand_irq_lock, flags); 129 130 return stat; 131 } 132 133 static irqreturn_t fsl_ifc_nand_irq(int irqno, void *data) 134 { 135 struct fsl_ifc_ctrl *ctrl = data; 136 137 if (check_nand_stat(ctrl)) 138 return IRQ_HANDLED; 139 140 return IRQ_NONE; 141 } 142 143 /* 144 * NOTE: This interrupt is used to report ifc events of various kinds, 145 * such as transaction errors on the chipselects. 146 */ 147 static irqreturn_t fsl_ifc_ctrl_irq(int irqno, void *data) 148 { 149 struct fsl_ifc_ctrl *ctrl = data; 150 struct fsl_ifc_global __iomem *ifc = ctrl->gregs; 151 u32 err_axiid, err_srcid, status, cs_err, err_addr; 152 irqreturn_t ret = IRQ_NONE; 153 154 /* read for chip select error */ 155 cs_err = ifc_in32(&ifc->cm_evter_stat); 156 if (cs_err) { 157 dev_err(ctrl->dev, "transaction sent to IFC is not mapped to any memory bank 0x%08X\n", 158 cs_err); 159 /* clear the chip select error */ 160 ifc_out32(IFC_CM_EVTER_STAT_CSER, &ifc->cm_evter_stat); 161 162 /* read error attribute registers print the error information */ 163 status = ifc_in32(&ifc->cm_erattr0); 164 err_addr = ifc_in32(&ifc->cm_erattr1); 165 166 if (status & IFC_CM_ERATTR0_ERTYP_READ) 167 dev_err(ctrl->dev, "Read transaction error CM_ERATTR0 0x%08X\n", 168 status); 169 else 170 dev_err(ctrl->dev, "Write transaction error CM_ERATTR0 0x%08X\n", 171 status); 172 173 err_axiid = (status & IFC_CM_ERATTR0_ERAID) >> 174 IFC_CM_ERATTR0_ERAID_SHIFT; 175 dev_err(ctrl->dev, "AXI ID of the error transaction 0x%08X\n", 176 err_axiid); 177 178 err_srcid = (status & IFC_CM_ERATTR0_ESRCID) >> 179 IFC_CM_ERATTR0_ESRCID_SHIFT; 180 dev_err(ctrl->dev, "SRC ID of the error transaction 0x%08X\n", 181 err_srcid); 182 183 dev_err(ctrl->dev, "Transaction Address corresponding to error ERADDR 0x%08X\n", 184 err_addr); 185 186 ret = IRQ_HANDLED; 187 } 188 189 if (check_nand_stat(ctrl)) 190 ret = IRQ_HANDLED; 191 192 return ret; 193 } 194 195 /* 196 * fsl_ifc_ctrl_probe 197 * 198 * called by device layer when it finds a device matching 199 * one our driver can handled. This code allocates all of 200 * the resources needed for the controller only. The 201 * resources for the NAND banks themselves are allocated 202 * in the chip probe function. 203 */ 204 static int fsl_ifc_ctrl_probe(struct platform_device *dev) 205 { 206 int ret = 0; 207 int version, banks; 208 void __iomem *addr; 209 210 dev_info(&dev->dev, "Freescale Integrated Flash Controller\n"); 211 212 fsl_ifc_ctrl_dev = devm_kzalloc(&dev->dev, sizeof(*fsl_ifc_ctrl_dev), 213 GFP_KERNEL); 214 if (!fsl_ifc_ctrl_dev) 215 return -ENOMEM; 216 217 dev_set_drvdata(&dev->dev, fsl_ifc_ctrl_dev); 218 219 /* IOMAP the entire IFC region */ 220 fsl_ifc_ctrl_dev->gregs = of_iomap(dev->dev.of_node, 0); 221 if (!fsl_ifc_ctrl_dev->gregs) { 222 dev_err(&dev->dev, "failed to get memory region\n"); 223 return -ENODEV; 224 } 225 226 if (of_property_read_bool(dev->dev.of_node, "little-endian")) { 227 fsl_ifc_ctrl_dev->little_endian = true; 228 dev_dbg(&dev->dev, "IFC REGISTERS are LITTLE endian\n"); 229 } else { 230 fsl_ifc_ctrl_dev->little_endian = false; 231 dev_dbg(&dev->dev, "IFC REGISTERS are BIG endian\n"); 232 } 233 234 version = ifc_in32(&fsl_ifc_ctrl_dev->gregs->ifc_rev) & 235 FSL_IFC_VERSION_MASK; 236 237 banks = (version == FSL_IFC_VERSION_1_0_0) ? 4 : 8; 238 dev_info(&dev->dev, "IFC version %d.%d, %d banks\n", 239 version >> 24, (version >> 16) & 0xf, banks); 240 241 fsl_ifc_ctrl_dev->version = version; 242 fsl_ifc_ctrl_dev->banks = banks; 243 244 addr = fsl_ifc_ctrl_dev->gregs; 245 if (version >= FSL_IFC_VERSION_2_0_0) 246 addr += PGOFFSET_64K; 247 else 248 addr += PGOFFSET_4K; 249 fsl_ifc_ctrl_dev->rregs = addr; 250 251 /* get the Controller level irq */ 252 fsl_ifc_ctrl_dev->irq = irq_of_parse_and_map(dev->dev.of_node, 0); 253 if (fsl_ifc_ctrl_dev->irq == 0) { 254 dev_err(&dev->dev, "failed to get irq resource for IFC\n"); 255 ret = -ENODEV; 256 goto err; 257 } 258 259 /* get the nand machine irq */ 260 fsl_ifc_ctrl_dev->nand_irq = 261 irq_of_parse_and_map(dev->dev.of_node, 1); 262 263 fsl_ifc_ctrl_dev->dev = &dev->dev; 264 265 ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev); 266 if (ret < 0) 267 goto err_unmap_nandirq; 268 269 init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait); 270 271 ret = request_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_irq, IRQF_SHARED, 272 "fsl-ifc", fsl_ifc_ctrl_dev); 273 if (ret != 0) { 274 dev_err(&dev->dev, "failed to install irq (%d)\n", 275 fsl_ifc_ctrl_dev->irq); 276 goto err_unmap_nandirq; 277 } 278 279 if (fsl_ifc_ctrl_dev->nand_irq) { 280 ret = request_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_nand_irq, 281 0, "fsl-ifc-nand", fsl_ifc_ctrl_dev); 282 if (ret != 0) { 283 dev_err(&dev->dev, "failed to install irq (%d)\n", 284 fsl_ifc_ctrl_dev->nand_irq); 285 goto err_free_irq; 286 } 287 } 288 289 /* legacy dts may still use "simple-bus" compatible */ 290 ret = of_platform_default_populate(dev->dev.of_node, NULL, &dev->dev); 291 if (ret) 292 goto err_free_nandirq; 293 294 return 0; 295 296 err_free_nandirq: 297 free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev); 298 err_free_irq: 299 free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev); 300 err_unmap_nandirq: 301 irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq); 302 irq_dispose_mapping(fsl_ifc_ctrl_dev->irq); 303 err: 304 iounmap(fsl_ifc_ctrl_dev->gregs); 305 return ret; 306 } 307 308 static const struct of_device_id fsl_ifc_match[] = { 309 { 310 .compatible = "fsl,ifc", 311 }, 312 {}, 313 }; 314 315 static struct platform_driver fsl_ifc_ctrl_driver = { 316 .driver = { 317 .name = "fsl-ifc", 318 .of_match_table = fsl_ifc_match, 319 }, 320 .probe = fsl_ifc_ctrl_probe, 321 .remove = fsl_ifc_ctrl_remove, 322 }; 323 324 static int __init fsl_ifc_init(void) 325 { 326 return platform_driver_register(&fsl_ifc_ctrl_driver); 327 } 328 subsys_initcall(fsl_ifc_init); 329 330 MODULE_AUTHOR("Freescale Semiconductor"); 331 MODULE_DESCRIPTION("Freescale Integrated Flash Controller driver"); 332