arch/powerpc/sysdev/fsl_lbc.c

   1 /*
   2  * Freescale LBC and UPM routines.
   3  *
   4  * Copyright © 2007-2008  MontaVista Software, Inc.
   5  * Copyright © 2010 Freescale Semiconductor
   6  *
   7  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
   8  * Author: Jack Lan <Jack.Lan@freescale.com>
   9  * Author: Roy Zang <tie-fei.zang@freescale.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/export.h>
  19 #include <linux/kernel.h>
  20 #include <linux/compiler.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/types.h>
  23 #include <linux/io.h>
  24 #include <linux/of.h>
  25 #include <linux/slab.h>
  26 #include <linux/sched.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/mod_devicetable.h>
  30 #include <linux/syscore_ops.h>
  31 #include <asm/prom.h>
  32 #include <asm/fsl_lbc.h>
  33
  34 static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock);
  35 struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev;
  36 EXPORT_SYMBOL(fsl_lbc_ctrl_dev);
  37
  38 /**
  39  * fsl_lbc_addr - convert the base address
  40  * @addr_base:  base address of the memory bank
  41  *
  42  * This function converts a base address of lbc into the right format for the
  43  * BR register. If the SOC has eLBC then it returns 32bit physical address
  44  * else it convers a 34bit local bus physical address to correct format of
  45  * 32bit address for BR register (Example: MPC8641).
  46  */
  47 u32 fsl_lbc_addr(phys_addr_t addr_base)
  48 {
  49         struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node;
  50         u32 addr = addr_base & 0xffff8000;
  51
  52         if (of_device_is_compatible(np, "fsl,elbc"))
  53                 return addr;
  54
  55         return addr | ((addr_base & 0x300000000ull) >> 19);
  56 }
  57 EXPORT_SYMBOL(fsl_lbc_addr);
  58
  59 /**
  60  * fsl_lbc_find - find Localbus bank
  61  * @addr_base:  base address of the memory bank
  62  *
  63  * This function walks LBC banks comparing "Base address" field of the BR
  64  * registers with the supplied addr_base argument. When bases match this
  65  * function returns bank number (starting with 0), otherwise it returns
  66  * appropriate errno value.
  67  */
  68 int fsl_lbc_find(phys_addr_t addr_base)
  69 {
  70         int i;
  71         struct fsl_lbc_regs __iomem *lbc;
  72
  73         if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
  74                 return -ENODEV;
  75
  76         lbc = fsl_lbc_ctrl_dev->regs;
  77         for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) {
  78                 u32 br = in_be32(&lbc->bank[i].br);
  79                 u32 or = in_be32(&lbc->bank[i].or);
  80
  81                 if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base))
  82                         return i;
  83         }
  84
  85         return -ENOENT;
  86 }
  87 EXPORT_SYMBOL(fsl_lbc_find);
  88
  89 /**
  90  * fsl_upm_find - find pre-programmed UPM via base address
  91  * @addr_base:  base address of the memory bank controlled by the UPM
  92  * @upm:        pointer to the allocated fsl_upm structure
  93  *
  94  * This function fills fsl_upm structure so you can use it with the rest of
  95  * UPM API. On success this function returns 0, otherwise it returns
  96  * appropriate errno value.
  97  */
  98 int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm)
  99 {
 100         int bank;
 101         u32 br;
 102         struct fsl_lbc_regs __iomem *lbc;
 103
 104         bank = fsl_lbc_find(addr_base);
 105         if (bank < 0)
 106                 return bank;
 107
 108         if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
 109                 return -ENODEV;
 110
 111         lbc = fsl_lbc_ctrl_dev->regs;
 112         br = in_be32(&lbc->bank[bank].br);
 113
 114         switch (br & BR_MSEL) {
 115         case BR_MS_UPMA:
 116                 upm->mxmr = &lbc->mamr;
 117                 break;
 118         case BR_MS_UPMB:
 119                 upm->mxmr = &lbc->mbmr;
 120                 break;
 121         case BR_MS_UPMC:
 122                 upm->mxmr = &lbc->mcmr;
 123                 break;
 124         default:
 125                 return -EINVAL;
 126         }
 127
 128         switch (br & BR_PS) {
 129         case BR_PS_8:
 130                 upm->width = 8;
 131                 break;
 132         case BR_PS_16:
 133                 upm->width = 16;
 134                 break;
 135         case BR_PS_32:
 136                 upm->width = 32;
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(fsl_upm_find);
 145
 146 /**
 147  * fsl_upm_run_pattern - actually run an UPM pattern
 148  * @upm:        pointer to the fsl_upm structure obtained via fsl_upm_find
 149  * @io_base:    remapped pointer to where memory access should happen
 150  * @mar:        MAR register content during pattern execution
 151  *
 152  * This function triggers dummy write to the memory specified by the io_base,
 153  * thus UPM pattern actually executed. Note that mar usage depends on the
 154  * pre-programmed AMX bits in the UPM RAM.
 155  */
 156 int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar)
 157 {
 158         int ret = 0;
 159         unsigned long flags;
 160
 161         if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs)
 162                 return -ENODEV;
 163
 164         spin_lock_irqsave(&fsl_lbc_lock, flags);
 165
 166         out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar);
 167
 168         switch (upm->width) {
 169         case 8:
 170                 out_8(io_base, 0x0);
 171                 break;
 172         case 16:
 173                 out_be16(io_base, 0x0);
 174                 break;
 175         case 32:
 176                 out_be32(io_base, 0x0);
 177                 break;
 178         default:
 179                 ret = -EINVAL;
 180                 break;
 181         }
 182
 183         spin_unlock_irqrestore(&fsl_lbc_lock, flags);
 184
 185         return ret;
 186 }
 187 EXPORT_SYMBOL(fsl_upm_run_pattern);
 188
 189 static int fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl,
 190                              struct device_node *node)
 191 {
 192         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 193
 194         /* clear event registers */
 195         setbits32(&lbc->ltesr, LTESR_CLEAR);
 196         out_be32(&lbc->lteatr, 0);
 197         out_be32(&lbc->ltear, 0);
 198         out_be32(&lbc->lteccr, LTECCR_CLEAR);
 199         out_be32(&lbc->ltedr, LTEDR_ENABLE);
 200
 201         /* Set the monitor timeout value to the maximum for erratum A001 */
 202         if (of_device_is_compatible(node, "fsl,elbc"))
 203                 clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS);
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * NOTE: This interrupt is used to report localbus events of various kinds,
 210  * such as transaction errors on the chipselects.
 211  */
 212
 213 static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data)
 214 {
 215         struct fsl_lbc_ctrl *ctrl = data;
 216         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 217         u32 status;
 218         unsigned long flags;
 219
 220         spin_lock_irqsave(&fsl_lbc_lock, flags);
 221         status = in_be32(&lbc->ltesr);
 222         if (!status) {
 223                 spin_unlock_irqrestore(&fsl_lbc_lock, flags);
 224                 return IRQ_NONE;
 225         }
 226
 227         out_be32(&lbc->ltesr, LTESR_CLEAR);
 228         out_be32(&lbc->lteatr, 0);
 229         out_be32(&lbc->ltear, 0);
 230         ctrl->irq_status = status;
 231
 232         if (status & LTESR_BM)
 233                 dev_err(ctrl->dev, "Local bus monitor time-out: "
 234                         "LTESR 0x%08X\n", status);
 235         if (status & LTESR_WP)
 236                 dev_err(ctrl->dev, "Write protect error: "
 237                         "LTESR 0x%08X\n", status);
 238         if (status & LTESR_ATMW)
 239                 dev_err(ctrl->dev, "Atomic write error: "
 240                         "LTESR 0x%08X\n", status);
 241         if (status & LTESR_ATMR)
 242                 dev_err(ctrl->dev, "Atomic read error: "
 243                         "LTESR 0x%08X\n", status);
 244         if (status & LTESR_CS)
 245                 dev_err(ctrl->dev, "Chip select error: "
 246                         "LTESR 0x%08X\n", status);
 247         if (status & LTESR_FCT) {
 248                 dev_err(ctrl->dev, "FCM command time-out: "
 249                         "LTESR 0x%08X\n", status);
 250                 smp_wmb();
 251                 wake_up(&ctrl->irq_wait);
 252         }
 253         if (status & LTESR_PAR) {
 254                 dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: "
 255                         "LTESR 0x%08X\n", status);
 256                 smp_wmb();
 257                 wake_up(&ctrl->irq_wait);
 258         }
 259         if (status & LTESR_CC) {
 260                 smp_wmb();
 261                 wake_up(&ctrl->irq_wait);
 262         }
 263         if (status & ~LTESR_MASK)
 264                 dev_err(ctrl->dev, "Unknown error: "
 265                         "LTESR 0x%08X\n", status);
 266         spin_unlock_irqrestore(&fsl_lbc_lock, flags);
 267         return IRQ_HANDLED;
 268 }
 269
 270 /*
 271  * fsl_lbc_ctrl_probe
 272  *
 273  * called by device layer when it finds a device matching
 274  * one our driver can handled. This code allocates all of
 275  * the resources needed for the controller only.  The
 276  * resources for the NAND banks themselves are allocated
 277  * in the chip probe function.
 278 */
 279
 280 static int fsl_lbc_ctrl_probe(struct platform_device *dev)
 281 {
 282         int ret;
 283
 284         if (!dev->dev.of_node) {
 285                 dev_err(&dev->dev, "Device OF-Node is NULL");
 286                 return -EFAULT;
 287         }
 288
 289         fsl_lbc_ctrl_dev = kzalloc(sizeof(*fsl_lbc_ctrl_dev), GFP_KERNEL);
 290         if (!fsl_lbc_ctrl_dev)
 291                 return -ENOMEM;
 292
 293         dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev);
 294
 295         spin_lock_init(&fsl_lbc_ctrl_dev->lock);
 296         init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait);
 297
 298         fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0);
 299         if (!fsl_lbc_ctrl_dev->regs) {
 300                 dev_err(&dev->dev, "failed to get memory region\n");
 301                 ret = -ENODEV;
 302                 goto err;
 303         }
 304
 305         fsl_lbc_ctrl_dev->irq[0] = irq_of_parse_and_map(dev->dev.of_node, 0);
 306         if (!fsl_lbc_ctrl_dev->irq[0]) {
 307                 dev_err(&dev->dev, "failed to get irq resource\n");
 308                 ret = -ENODEV;
 309                 goto err;
 310         }
 311
 312         fsl_lbc_ctrl_dev->dev = &dev->dev;
 313
 314         ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node);
 315         if (ret < 0)
 316                 goto err;
 317
 318         ret = request_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_irq, 0,
 319                                 "fsl-lbc", fsl_lbc_ctrl_dev);
 320         if (ret != 0) {
 321                 dev_err(&dev->dev, "failed to install irq (%d)\n",
 322                         fsl_lbc_ctrl_dev->irq[0]);
 323                 ret = fsl_lbc_ctrl_dev->irq[0];
 324                 goto err;
 325         }
 326
 327         fsl_lbc_ctrl_dev->irq[1] = irq_of_parse_and_map(dev->dev.of_node, 1);
 328         if (fsl_lbc_ctrl_dev->irq[1]) {
 329                 ret = request_irq(fsl_lbc_ctrl_dev->irq[1], fsl_lbc_ctrl_irq,
 330                                 IRQF_SHARED, "fsl-lbc-err", fsl_lbc_ctrl_dev);
 331                 if (ret) {
 332                         dev_err(&dev->dev, "failed to install irq (%d)\n",
 333                                         fsl_lbc_ctrl_dev->irq[1]);
 334                         ret = fsl_lbc_ctrl_dev->irq[1];
 335                         goto err1;
 336                 }
 337         }
 338
 339         /* Enable interrupts for any detected events */
 340         out_be32(&fsl_lbc_ctrl_dev->regs->lteir, LTEIR_ENABLE);
 341
 342         return 0;
 343
 344 err1:
 345         free_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_dev);
 346 err:
 347         iounmap(fsl_lbc_ctrl_dev->regs);
 348         kfree(fsl_lbc_ctrl_dev);
 349         fsl_lbc_ctrl_dev = NULL;
 350         return ret;
 351 }
 352
 353 #ifdef CONFIG_SUSPEND
 354
 355 /* save lbc registers */
 356 static int fsl_lbc_syscore_suspend(void)
 357 {
 358         struct fsl_lbc_ctrl *ctrl;
 359         struct fsl_lbc_regs __iomem *lbc;
 360
 361         ctrl = fsl_lbc_ctrl_dev;
 362         if (!ctrl)
 363                 goto out;
 364
 365         lbc = ctrl->regs;
 366         if (!lbc)
 367                 goto out;
 368
 369         ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL);
 370         if (!ctrl->saved_regs)
 371                 return -ENOMEM;
 372
 373         _memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs));
 374
 375 out:
 376         return 0;
 377 }
 378
 379 /* restore lbc registers */
 380 static void fsl_lbc_syscore_resume(void)
 381 {
 382         struct fsl_lbc_ctrl *ctrl;
 383         struct fsl_lbc_regs __iomem *lbc;
 384
 385         ctrl = fsl_lbc_ctrl_dev;
 386         if (!ctrl)
 387                 goto out;
 388
 389         lbc = ctrl->regs;
 390         if (!lbc)
 391                 goto out;
 392
 393         if (ctrl->saved_regs) {
 394                 _memcpy_toio(lbc, ctrl->saved_regs,
 395                                 sizeof(struct fsl_lbc_regs));
 396                 kfree(ctrl->saved_regs);
 397                 ctrl->saved_regs = NULL;
 398         }
 399
 400 out:
 401         return;
 402 }
 403 #endif /* CONFIG_SUSPEND */
 404
 405 static const struct of_device_id fsl_lbc_match[] = {
 406         { .compatible = "fsl,elbc", },
 407         { .compatible = "fsl,pq3-localbus", },
 408         { .compatible = "fsl,pq2-localbus", },
 409         { .compatible = "fsl,pq2pro-localbus", },
 410         {},
 411 };
 412
 413 #ifdef CONFIG_SUSPEND
 414 static struct syscore_ops lbc_syscore_pm_ops = {
 415         .suspend = fsl_lbc_syscore_suspend,
 416         .resume = fsl_lbc_syscore_resume,
 417 };
 418 #endif
 419
 420 static struct platform_driver fsl_lbc_ctrl_driver = {
 421         .driver = {
 422                 .name = "fsl-lbc",
 423                 .of_match_table = fsl_lbc_match,
 424         },
 425         .probe = fsl_lbc_ctrl_probe,
 426 };
 427
 428 static int __init fsl_lbc_init(void)
 429 {
 430 #ifdef CONFIG_SUSPEND
 431         register_syscore_ops(&lbc_syscore_pm_ops);
 432 #endif
 433         return platform_driver_register(&fsl_lbc_ctrl_driver);
 434 }
 435 subsys_initcall(fsl_lbc_init);