arch/powerpc/sysdev/cpm1.c

   1 /*
   2  * General Purpose functions for the global management of the
   3  * Communication Processor Module.
   4  * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
   5  *
   6  * In addition to the individual control of the communication
   7  * channels, there are a few functions that globally affect the
   8  * communication processor.
   9  *
  10  * Buffer descriptors must be allocated from the dual ported memory
  11  * space.  The allocator for that is here.  When the communication
  12  * process is reset, we reclaim the memory available.  There is
  13  * currently no deallocator for this memory.
  14  * The amount of space available is platform dependent.  On the
  15  * MBX, the EPPC software loads additional microcode into the
  16  * communication processor, and uses some of the DP ram for this
  17  * purpose.  Current, the first 512 bytes and the last 256 bytes of
  18  * memory are used.  Right now I am conservative and only use the
  19  * memory that can never be used for microcode.  If there are
  20  * applications that require more DP ram, we can expand the boundaries
  21  * but then we have to be careful of any downloaded microcode.
  22  */
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/dma-mapping.h>
  27 #include <linux/param.h>
  28 #include <linux/string.h>
  29 #include <linux/mm.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/irq.h>
  32 #include <linux/module.h>
  33 #include <linux/spinlock.h>
  34 #include <asm/page.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/8xx_immap.h>
  37 #include <asm/cpm1.h>
  38 #include <asm/io.h>
  39 #include <asm/tlbflush.h>
  40 #include <asm/rheap.h>
  41 #include <asm/prom.h>
  42 #include <asm/cpm.h>
  43
  44 #include <asm/fs_pd.h>
  45
  46 #ifdef CONFIG_8xx_GPIO
  47 #include <linux/of_gpio.h>
  48 #endif
  49
  50 #define CPM_MAP_SIZE    (0x4000)
  51
  52 cpm8xx_t __iomem *cpmp;  /* Pointer to comm processor space */
  53 immap_t __iomem *mpc8xx_immr;
  54 static cpic8xx_t __iomem *cpic_reg;
  55
  56 static struct irq_host *cpm_pic_host;
  57
  58 static void cpm_mask_irq(unsigned int irq)
  59 {
  60         unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;
  61
  62         clrbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
  63 }
  64
  65 static void cpm_unmask_irq(unsigned int irq)
  66 {
  67         unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;
  68
  69         setbits32(&cpic_reg->cpic_cimr, (1 << cpm_vec));
  70 }
  71
  72 static void cpm_end_irq(unsigned int irq)
  73 {
  74         unsigned int cpm_vec = (unsigned int)irq_map[irq].hwirq;
  75
  76         out_be32(&cpic_reg->cpic_cisr, (1 << cpm_vec));
  77 }
  78
  79 static struct irq_chip cpm_pic = {
  80         .typename = " CPM PIC ",
  81         .mask = cpm_mask_irq,
  82         .unmask = cpm_unmask_irq,
  83         .eoi = cpm_end_irq,
  84 };
  85
  86 int cpm_get_irq(void)
  87 {
  88         int cpm_vec;
  89
  90         /* Get the vector by setting the ACK bit and then reading
  91          * the register.
  92          */
  93         out_be16(&cpic_reg->cpic_civr, 1);
  94         cpm_vec = in_be16(&cpic_reg->cpic_civr);
  95         cpm_vec >>= 11;
  96
  97         return irq_linear_revmap(cpm_pic_host, cpm_vec);
  98 }
  99
 100 static int cpm_pic_host_map(struct irq_host *h, unsigned int virq,
 101                           irq_hw_number_t hw)
 102 {
 103         pr_debug("cpm_pic_host_map(%d, 0x%lx)\n", virq, hw);
 104
 105         get_irq_desc(virq)->status |= IRQ_LEVEL;
 106         set_irq_chip_and_handler(virq, &cpm_pic, handle_fasteoi_irq);
 107         return 0;
 108 }
 109
 110 /* The CPM can generate the error interrupt when there is a race condition
 111  * between generating and masking interrupts.  All we have to do is ACK it
 112  * and return.  This is a no-op function so we don't need any special
 113  * tests in the interrupt handler.
 114  */
 115 static irqreturn_t cpm_error_interrupt(int irq, void *dev)
 116 {
 117         return IRQ_HANDLED;
 118 }
 119
 120 static struct irqaction cpm_error_irqaction = {
 121         .handler = cpm_error_interrupt,
 122         .name = "error",
 123 };
 124
 125 static struct irq_host_ops cpm_pic_host_ops = {
 126         .map = cpm_pic_host_map,
 127 };
 128
 129 unsigned int cpm_pic_init(void)
 130 {
 131         struct device_node *np = NULL;
 132         struct resource res;
 133         unsigned int sirq = NO_IRQ, hwirq, eirq;
 134         int ret;
 135
 136         pr_debug("cpm_pic_init\n");
 137
 138         np = of_find_compatible_node(NULL, NULL, "fsl,cpm1-pic");
 139         if (np == NULL)
 140                 np = of_find_compatible_node(NULL, "cpm-pic", "CPM");
 141         if (np == NULL) {
 142                 printk(KERN_ERR "CPM PIC init: can not find cpm-pic node\n");
 143                 return sirq;
 144         }
 145
 146         ret = of_address_to_resource(np, 0, &res);
 147         if (ret)
 148                 goto end;
 149
 150         cpic_reg = ioremap(res.start, res.end - res.start + 1);
 151         if (cpic_reg == NULL)
 152                 goto end;
 153
 154         sirq = irq_of_parse_and_map(np, 0);
 155         if (sirq == NO_IRQ)
 156                 goto end;
 157
 158         /* Initialize the CPM interrupt controller. */
 159         hwirq = (unsigned int)irq_map[sirq].hwirq;
 160         out_be32(&cpic_reg->cpic_cicr,
 161             (CICR_SCD_SCC4 | CICR_SCC_SCC3 | CICR_SCB_SCC2 | CICR_SCA_SCC1) |
 162                 ((hwirq/2) << 13) | CICR_HP_MASK);
 163
 164         out_be32(&cpic_reg->cpic_cimr, 0);
 165
 166         cpm_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
 167                                       64, &cpm_pic_host_ops, 64);
 168         if (cpm_pic_host == NULL) {
 169                 printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
 170                 sirq = NO_IRQ;
 171                 goto end;
 172         }
 173
 174         /* Install our own error handler. */
 175         np = of_find_compatible_node(NULL, NULL, "fsl,cpm1");
 176         if (np == NULL)
 177                 np = of_find_node_by_type(NULL, "cpm");
 178         if (np == NULL) {
 179                 printk(KERN_ERR "CPM PIC init: can not find cpm node\n");
 180                 goto end;
 181         }
 182
 183         eirq = irq_of_parse_and_map(np, 0);
 184         if (eirq == NO_IRQ)
 185                 goto end;
 186
 187         if (setup_irq(eirq, &cpm_error_irqaction))
 188                 printk(KERN_ERR "Could not allocate CPM error IRQ!");
 189
 190         setbits32(&cpic_reg->cpic_cicr, CICR_IEN);
 191
 192 end:
 193         of_node_put(np);
 194         return sirq;
 195 }
 196
 197 void __init cpm_reset(void)
 198 {
 199         sysconf8xx_t __iomem *siu_conf;
 200
 201         mpc8xx_immr = ioremap(get_immrbase(), 0x4000);
 202         if (!mpc8xx_immr) {
 203                 printk(KERN_CRIT "Could not map IMMR\n");
 204                 return;
 205         }
 206
 207         cpmp = &mpc8xx_immr->im_cpm;
 208
 209 #ifndef CONFIG_PPC_EARLY_DEBUG_CPM
 210         /* Perform a reset.
 211         */
 212         out_be16(&cpmp->cp_cpcr, CPM_CR_RST | CPM_CR_FLG);
 213
 214         /* Wait for it.
 215         */
 216         while (in_be16(&cpmp->cp_cpcr) & CPM_CR_FLG);
 217 #endif
 218
 219 #ifdef CONFIG_UCODE_PATCH
 220         cpm_load_patch(cpmp);
 221 #endif
 222
 223         /* Set SDMA Bus Request priority 5.
 224          * On 860T, this also enables FEC priority 6.  I am not sure
 225          * this is what we realy want for some applications, but the
 226          * manual recommends it.
 227          * Bit 25, FAM can also be set to use FEC aggressive mode (860T).
 228          */
 229         siu_conf = immr_map(im_siu_conf);
 230         out_be32(&siu_conf->sc_sdcr, 1);
 231         immr_unmap(siu_conf);
 232
 233         cpm_muram_init();
 234 }
 235
 236 static DEFINE_SPINLOCK(cmd_lock);
 237
 238 #define MAX_CR_CMD_LOOPS        10000
 239
 240 int cpm_command(u32 command, u8 opcode)
 241 {
 242         int i, ret;
 243         unsigned long flags;
 244
 245         if (command & 0xffffff0f)
 246                 return -EINVAL;
 247
 248         spin_lock_irqsave(&cmd_lock, flags);
 249
 250         ret = 0;
 251         out_be16(&cpmp->cp_cpcr, command | CPM_CR_FLG | (opcode << 8));
 252         for (i = 0; i < MAX_CR_CMD_LOOPS; i++)
 253                 if ((in_be16(&cpmp->cp_cpcr) & CPM_CR_FLG) == 0)
 254                         goto out;
 255
 256         printk(KERN_ERR "%s(): Not able to issue CPM command\n", __func__);
 257         ret = -EIO;
 258 out:
 259         spin_unlock_irqrestore(&cmd_lock, flags);
 260         return ret;
 261 }
 262 EXPORT_SYMBOL(cpm_command);
 263
 264 /* Set a baud rate generator.  This needs lots of work.  There are
 265  * four BRGs, any of which can be wired to any channel.
 266  * The internal baud rate clock is the system clock divided by 16.
 267  * This assumes the baudrate is 16x oversampled by the uart.
 268  */
 269 #define BRG_INT_CLK             (get_brgfreq())
 270 #define BRG_UART_CLK            (BRG_INT_CLK/16)
 271 #define BRG_UART_CLK_DIV16      (BRG_UART_CLK/16)
 272
 273 void
 274 cpm_setbrg(uint brg, uint rate)
 275 {
 276         u32 __iomem *bp;
 277
 278         /* This is good enough to get SMCs running.....
 279         */
 280         bp = &cpmp->cp_brgc1;
 281         bp += brg;
 282         /* The BRG has a 12-bit counter.  For really slow baud rates (or
 283          * really fast processors), we may have to further divide by 16.
 284          */
 285         if (((BRG_UART_CLK / rate) - 1) < 4096)
 286                 out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);
 287         else
 288                 out_be32(bp, (((BRG_UART_CLK_DIV16 / rate) - 1) << 1) |
 289                               CPM_BRG_EN | CPM_BRG_DIV16);
 290 }
 291
 292 struct cpm_ioport16 {
 293         __be16 dir, par, odr_sor, dat, intr;
 294         __be16 res[3];
 295 };
 296
 297 struct cpm_ioport32b {
 298         __be32 dir, par, odr, dat;
 299 };
 300
 301 struct cpm_ioport32e {
 302         __be32 dir, par, sor, odr, dat;
 303 };
 304
 305 static void cpm1_set_pin32(int port, int pin, int flags)
 306 {
 307         struct cpm_ioport32e __iomem *iop;
 308         pin = 1 << (31 - pin);
 309
 310         if (port == CPM_PORTB)
 311                 iop = (struct cpm_ioport32e __iomem *)
 312                       &mpc8xx_immr->im_cpm.cp_pbdir;
 313         else
 314                 iop = (struct cpm_ioport32e __iomem *)
 315                       &mpc8xx_immr->im_cpm.cp_pedir;
 316
 317         if (flags & CPM_PIN_OUTPUT)
 318                 setbits32(&iop->dir, pin);
 319         else
 320                 clrbits32(&iop->dir, pin);
 321
 322         if (!(flags & CPM_PIN_GPIO))
 323                 setbits32(&iop->par, pin);
 324         else
 325                 clrbits32(&iop->par, pin);
 326
 327         if (port == CPM_PORTB) {
 328                 if (flags & CPM_PIN_OPENDRAIN)
 329                         setbits16(&mpc8xx_immr->im_cpm.cp_pbodr, pin);
 330                 else
 331                         clrbits16(&mpc8xx_immr->im_cpm.cp_pbodr, pin);
 332         }
 333
 334         if (port == CPM_PORTE) {
 335                 if (flags & CPM_PIN_SECONDARY)
 336                         setbits32(&iop->sor, pin);
 337                 else
 338                         clrbits32(&iop->sor, pin);
 339
 340                 if (flags & CPM_PIN_OPENDRAIN)
 341                         setbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
 342                 else
 343                         clrbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
 344         }
 345 }
 346
 347 static void cpm1_set_pin16(int port, int pin, int flags)
 348 {
 349         struct cpm_ioport16 __iomem *iop =
 350                 (struct cpm_ioport16 __iomem *)&mpc8xx_immr->im_ioport;
 351
 352         pin = 1 << (15 - pin);
 353
 354         if (port != 0)
 355                 iop += port - 1;
 356
 357         if (flags & CPM_PIN_OUTPUT)
 358                 setbits16(&iop->dir, pin);
 359         else
 360                 clrbits16(&iop->dir, pin);
 361
 362         if (!(flags & CPM_PIN_GPIO))
 363                 setbits16(&iop->par, pin);
 364         else
 365                 clrbits16(&iop->par, pin);
 366
 367         if (port == CPM_PORTA) {
 368                 if (flags & CPM_PIN_OPENDRAIN)
 369                         setbits16(&iop->odr_sor, pin);
 370                 else
 371                         clrbits16(&iop->odr_sor, pin);
 372         }
 373         if (port == CPM_PORTC) {
 374                 if (flags & CPM_PIN_SECONDARY)
 375                         setbits16(&iop->odr_sor, pin);
 376                 else
 377                         clrbits16(&iop->odr_sor, pin);
 378         }
 379 }
 380
 381 void cpm1_set_pin(enum cpm_port port, int pin, int flags)
 382 {
 383         if (port == CPM_PORTB || port == CPM_PORTE)
 384                 cpm1_set_pin32(port, pin, flags);
 385         else
 386                 cpm1_set_pin16(port, pin, flags);
 387 }
 388
 389 int cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
 390 {
 391         int shift;
 392         int i, bits = 0;
 393         u32 __iomem *reg;
 394         u32 mask = 7;
 395
 396         u8 clk_map[][3] = {
 397                 {CPM_CLK_SCC1, CPM_BRG1, 0},
 398                 {CPM_CLK_SCC1, CPM_BRG2, 1},
 399                 {CPM_CLK_SCC1, CPM_BRG3, 2},
 400                 {CPM_CLK_SCC1, CPM_BRG4, 3},
 401                 {CPM_CLK_SCC1, CPM_CLK1, 4},
 402                 {CPM_CLK_SCC1, CPM_CLK2, 5},
 403                 {CPM_CLK_SCC1, CPM_CLK3, 6},
 404                 {CPM_CLK_SCC1, CPM_CLK4, 7},
 405
 406                 {CPM_CLK_SCC2, CPM_BRG1, 0},
 407                 {CPM_CLK_SCC2, CPM_BRG2, 1},
 408                 {CPM_CLK_SCC2, CPM_BRG3, 2},
 409                 {CPM_CLK_SCC2, CPM_BRG4, 3},
 410                 {CPM_CLK_SCC2, CPM_CLK1, 4},
 411                 {CPM_CLK_SCC2, CPM_CLK2, 5},
 412                 {CPM_CLK_SCC2, CPM_CLK3, 6},
 413                 {CPM_CLK_SCC2, CPM_CLK4, 7},
 414
 415                 {CPM_CLK_SCC3, CPM_BRG1, 0},
 416                 {CPM_CLK_SCC3, CPM_BRG2, 1},
 417                 {CPM_CLK_SCC3, CPM_BRG3, 2},
 418                 {CPM_CLK_SCC3, CPM_BRG4, 3},
 419                 {CPM_CLK_SCC3, CPM_CLK5, 4},
 420                 {CPM_CLK_SCC3, CPM_CLK6, 5},
 421                 {CPM_CLK_SCC3, CPM_CLK7, 6},
 422                 {CPM_CLK_SCC3, CPM_CLK8, 7},
 423
 424                 {CPM_CLK_SCC4, CPM_BRG1, 0},
 425                 {CPM_CLK_SCC4, CPM_BRG2, 1},
 426                 {CPM_CLK_SCC4, CPM_BRG3, 2},
 427                 {CPM_CLK_SCC4, CPM_BRG4, 3},
 428                 {CPM_CLK_SCC4, CPM_CLK5, 4},
 429                 {CPM_CLK_SCC4, CPM_CLK6, 5},
 430                 {CPM_CLK_SCC4, CPM_CLK7, 6},
 431                 {CPM_CLK_SCC4, CPM_CLK8, 7},
 432
 433                 {CPM_CLK_SMC1, CPM_BRG1, 0},
 434                 {CPM_CLK_SMC1, CPM_BRG2, 1},
 435                 {CPM_CLK_SMC1, CPM_BRG3, 2},
 436                 {CPM_CLK_SMC1, CPM_BRG4, 3},
 437                 {CPM_CLK_SMC1, CPM_CLK1, 4},
 438                 {CPM_CLK_SMC1, CPM_CLK2, 5},
 439                 {CPM_CLK_SMC1, CPM_CLK3, 6},
 440                 {CPM_CLK_SMC1, CPM_CLK4, 7},
 441
 442                 {CPM_CLK_SMC2, CPM_BRG1, 0},
 443                 {CPM_CLK_SMC2, CPM_BRG2, 1},
 444                 {CPM_CLK_SMC2, CPM_BRG3, 2},
 445                 {CPM_CLK_SMC2, CPM_BRG4, 3},
 446                 {CPM_CLK_SMC2, CPM_CLK5, 4},
 447                 {CPM_CLK_SMC2, CPM_CLK6, 5},
 448                 {CPM_CLK_SMC2, CPM_CLK7, 6},
 449                 {CPM_CLK_SMC2, CPM_CLK8, 7},
 450         };
 451
 452         switch (target) {
 453         case CPM_CLK_SCC1:
 454                 reg = &mpc8xx_immr->im_cpm.cp_sicr;
 455                 shift = 0;
 456                 break;
 457
 458         case CPM_CLK_SCC2:
 459                 reg = &mpc8xx_immr->im_cpm.cp_sicr;
 460                 shift = 8;
 461                 break;
 462
 463         case CPM_CLK_SCC3:
 464                 reg = &mpc8xx_immr->im_cpm.cp_sicr;
 465                 shift = 16;
 466                 break;
 467
 468         case CPM_CLK_SCC4:
 469                 reg = &mpc8xx_immr->im_cpm.cp_sicr;
 470                 shift = 24;
 471                 break;
 472
 473         case CPM_CLK_SMC1:
 474                 reg = &mpc8xx_immr->im_cpm.cp_simode;
 475                 shift = 12;
 476                 break;
 477
 478         case CPM_CLK_SMC2:
 479                 reg = &mpc8xx_immr->im_cpm.cp_simode;
 480                 shift = 28;
 481                 break;
 482
 483         default:
 484                 printk(KERN_ERR "cpm1_clock_setup: invalid clock target\n");
 485                 return -EINVAL;
 486         }
 487
 488         if (reg == &mpc8xx_immr->im_cpm.cp_sicr && mode == CPM_CLK_RX)
 489                 shift += 3;
 490
 491         for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 492                 if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 493                         bits = clk_map[i][2];
 494                         break;
 495                 }
 496         }
 497
 498         if (i == ARRAY_SIZE(clk_map)) {
 499                 printk(KERN_ERR "cpm1_clock_setup: invalid clock combination\n");
 500                 return -EINVAL;
 501         }
 502
 503         bits <<= shift;
 504         mask <<= shift;
 505         out_be32(reg, (in_be32(reg) & ~mask) | bits);
 506
 507         return 0;
 508 }
 509
 510 /*
 511  * GPIO LIB API implementation
 512  */
 513 #ifdef CONFIG_8xx_GPIO
 514
 515 struct cpm1_gpio16_chip {
 516         struct of_mm_gpio_chip mm_gc;
 517         spinlock_t lock;
 518
 519         /* shadowed data register to clear/set bits safely */
 520         u16 cpdata;
 521 };
 522
 523 static inline struct cpm1_gpio16_chip *
 524 to_cpm1_gpio16_chip(struct of_mm_gpio_chip *mm_gc)
 525 {
 526         return container_of(mm_gc, struct cpm1_gpio16_chip, mm_gc);
 527 }
 528
 529 static void cpm1_gpio16_save_regs(struct of_mm_gpio_chip *mm_gc)
 530 {
 531         struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
 532         struct cpm_ioport16 __iomem *iop = mm_gc->regs;
 533
 534         cpm1_gc->cpdata = in_be16(&iop->dat);
 535 }
 536
 537 static int cpm1_gpio16_get(struct gpio_chip *gc, unsigned int gpio)
 538 {
 539         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 540         struct cpm_ioport16 __iomem *iop = mm_gc->regs;
 541         u16 pin_mask;
 542
 543         pin_mask = 1 << (15 - gpio);
 544
 545         return !!(in_be16(&iop->dat) & pin_mask);
 546 }
 547
 548 static void __cpm1_gpio16_set(struct of_mm_gpio_chip *mm_gc, u16 pin_mask,
 549         int value)
 550 {
 551         struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
 552         struct cpm_ioport16 __iomem *iop = mm_gc->regs;
 553
 554         if (value)
 555                 cpm1_gc->cpdata |= pin_mask;
 556         else
 557                 cpm1_gc->cpdata &= ~pin_mask;
 558
 559         out_be16(&iop->dat, cpm1_gc->cpdata);
 560 }
 561
 562 static void cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
 563 {
 564         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 565         struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
 566         unsigned long flags;
 567         u16 pin_mask = 1 << (15 - gpio);
 568
 569         spin_lock_irqsave(&cpm1_gc->lock, flags);
 570
 571         __cpm1_gpio16_set(mm_gc, pin_mask, value);
 572
 573         spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 574 }
 575
 576 static int cpm1_gpio16_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 577 {
 578         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 579         struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
 580         struct cpm_ioport16 __iomem *iop = mm_gc->regs;
 581         unsigned long flags;
 582         u16 pin_mask = 1 << (15 - gpio);
 583
 584         spin_lock_irqsave(&cpm1_gc->lock, flags);
 585
 586         setbits16(&iop->dir, pin_mask);
 587         __cpm1_gpio16_set(mm_gc, pin_mask, val);
 588
 589         spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 590
 591         return 0;
 592 }
 593
 594 static int cpm1_gpio16_dir_in(struct gpio_chip *gc, unsigned int gpio)
 595 {
 596         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 597         struct cpm1_gpio16_chip *cpm1_gc = to_cpm1_gpio16_chip(mm_gc);
 598         struct cpm_ioport16 __iomem *iop = mm_gc->regs;
 599         unsigned long flags;
 600         u16 pin_mask = 1 << (15 - gpio);
 601
 602         spin_lock_irqsave(&cpm1_gc->lock, flags);
 603
 604         clrbits16(&iop->dir, pin_mask);
 605
 606         spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 607
 608         return 0;
 609 }
 610
 611 int cpm1_gpiochip_add16(struct device_node *np)
 612 {
 613         struct cpm1_gpio16_chip *cpm1_gc;
 614         struct of_mm_gpio_chip *mm_gc;
 615         struct of_gpio_chip *of_gc;
 616         struct gpio_chip *gc;
 617
 618         cpm1_gc = kzalloc(sizeof(*cpm1_gc), GFP_KERNEL);
 619         if (!cpm1_gc)
 620                 return -ENOMEM;
 621
 622         spin_lock_init(&cpm1_gc->lock);
 623
 624         mm_gc = &cpm1_gc->mm_gc;
 625         of_gc = &mm_gc->of_gc;
 626         gc = &of_gc->gc;
 627
 628         mm_gc->save_regs = cpm1_gpio16_save_regs;
 629         of_gc->gpio_cells = 2;
 630         gc->ngpio = 16;
 631         gc->direction_input = cpm1_gpio16_dir_in;
 632         gc->direction_output = cpm1_gpio16_dir_out;
 633         gc->get = cpm1_gpio16_get;
 634         gc->set = cpm1_gpio16_set;
 635
 636         return of_mm_gpiochip_add(np, mm_gc);
 637 }
 638
 639 struct cpm1_gpio32_chip {
 640         struct of_mm_gpio_chip mm_gc;
 641         spinlock_t lock;
 642
 643         /* shadowed data register to clear/set bits safely */
 644         u32 cpdata;
 645 };
 646
 647 static inline struct cpm1_gpio32_chip *
 648 to_cpm1_gpio32_chip(struct of_mm_gpio_chip *mm_gc)
 649 {
 650         return container_of(mm_gc, struct cpm1_gpio32_chip, mm_gc);
 651 }
 652
 653 static void cpm1_gpio32_save_regs(struct of_mm_gpio_chip *mm_gc)
 654 {
 655         struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
 656         struct cpm_ioport32b __iomem *iop = mm_gc->regs;
 657
 658         cpm1_gc->cpdata = in_be32(&iop->dat);
 659 }
 660
 661 static int cpm1_gpio32_get(struct gpio_chip *gc, unsigned int gpio)
 662 {
 663         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 664         struct cpm_ioport32b __iomem *iop = mm_gc->regs;
 665         u32 pin_mask;
 666
 667         pin_mask = 1 << (31 - gpio);
 668
 669         return !!(in_be32(&iop->dat) & pin_mask);
 670 }
 671
 672 static void __cpm1_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
 673         int value)
 674 {
 675         struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
 676         struct cpm_ioport32b __iomem *iop = mm_gc->regs;
 677
 678         if (value)
 679                 cpm1_gc->cpdata |= pin_mask;
 680         else
 681                 cpm1_gc->cpdata &= ~pin_mask;
 682
 683         out_be32(&iop->dat, cpm1_gc->cpdata);
 684 }
 685
 686 static void cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 687 {
 688         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 689         struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
 690         unsigned long flags;
 691         u32 pin_mask = 1 << (31 - gpio);
 692
 693         spin_lock_irqsave(&cpm1_gc->lock, flags);
 694
 695         __cpm1_gpio32_set(mm_gc, pin_mask, value);
 696
 697         spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 698 }
 699
 700 static int cpm1_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 701 {
 702         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 703         struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
 704         struct cpm_ioport32b __iomem *iop = mm_gc->regs;
 705         unsigned long flags;
 706         u32 pin_mask = 1 << (31 - gpio);
 707
 708         spin_lock_irqsave(&cpm1_gc->lock, flags);
 709
 710         setbits32(&iop->dir, pin_mask);
 711         __cpm1_gpio32_set(mm_gc, pin_mask, val);
 712
 713         spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 714
 715         return 0;
 716 }
 717
 718 static int cpm1_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio)
 719 {
 720         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 721         struct cpm1_gpio32_chip *cpm1_gc = to_cpm1_gpio32_chip(mm_gc);
 722         struct cpm_ioport32b __iomem *iop = mm_gc->regs;
 723         unsigned long flags;
 724         u32 pin_mask = 1 << (31 - gpio);
 725
 726         spin_lock_irqsave(&cpm1_gc->lock, flags);
 727
 728         clrbits32(&iop->dir, pin_mask);
 729
 730         spin_unlock_irqrestore(&cpm1_gc->lock, flags);
 731
 732         return 0;
 733 }
 734
 735 int cpm1_gpiochip_add32(struct device_node *np)
 736 {
 737         struct cpm1_gpio32_chip *cpm1_gc;
 738         struct of_mm_gpio_chip *mm_gc;
 739         struct of_gpio_chip *of_gc;
 740         struct gpio_chip *gc;
 741
 742         cpm1_gc = kzalloc(sizeof(*cpm1_gc), GFP_KERNEL);
 743         if (!cpm1_gc)
 744                 return -ENOMEM;
 745
 746         spin_lock_init(&cpm1_gc->lock);
 747
 748         mm_gc = &cpm1_gc->mm_gc;
 749         of_gc = &mm_gc->of_gc;
 750         gc = &of_gc->gc;
 751
 752         mm_gc->save_regs = cpm1_gpio32_save_regs;
 753         of_gc->gpio_cells = 2;
 754         gc->ngpio = 32;
 755         gc->direction_input = cpm1_gpio32_dir_in;
 756         gc->direction_output = cpm1_gpio32_dir_out;
 757         gc->get = cpm1_gpio32_get;
 758         gc->set = cpm1_gpio32_set;
 759
 760         return of_mm_gpiochip_add(np, mm_gc);
 761 }
 762
 763 static int cpm_init_par_io(void)
 764 {
 765         struct device_node *np;
 766
 767         for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank-a")
 768                 cpm1_gpiochip_add16(np);
 769
 770         for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank-b")
 771                 cpm1_gpiochip_add32(np);
 772
 773         for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank-c")
 774                 cpm1_gpiochip_add16(np);
 775
 776         for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank-d")
 777                 cpm1_gpiochip_add16(np);
 778
 779         /* Port E uses CPM2 layout */
 780         for_each_compatible_node(np, NULL, "fsl,cpm1-pario-bank-e")
 781                 cpm2_gpiochip_add32(np);
 782         return 0;
 783 }
 784 arch_initcall(cpm_init_par_io);
 785
 786 #endif /* CONFIG_8xx_GPIO */