arch/blackfin/mach-bf533/boards/stamp.c

   1 /*
   2  * File:         arch/blackfin/mach-bf533/stamp.c
   3  * Based on:     arch/blackfin/mach-bf533/ezkit.c
   4  * Author:       Aidan Williams <aidan@nicta.com.au>
   5  *
   6  * Created:      2005
   7  * Description:  Board Info File for the BF533-STAMP
   8  *
   9  * Modified:
  10  *               Copyright 2005 National ICT Australia (NICTA)
  11  *               Copyright 2004-2006 Analog Devices Inc.
  12  *
  13  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, see the file COPYING, or write
  27  * to the Free Software Foundation, Inc.,
  28  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  29  */
  30
  31 #include <linux/device.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/mtd/mtd.h>
  34 #include <linux/mtd/partitions.h>
  35 #include <linux/mtd/physmap.h>
  36 #include <linux/spi/spi.h>
  37 #include <linux/spi/flash.h>
  38 #if defined(CONFIG_USB_ISP1362_HCD) || defined(CONFIG_USB_ISP1362_HCD_MODULE)
  39 #include <linux/usb/isp1362.h>
  40 #endif
  41 #include <linux/irq.h>
  42 #include <linux/i2c.h>
  43 #include <asm/dma.h>
  44 #include <asm/bfin5xx_spi.h>
  45 #include <asm/reboot.h>
  46 #include <asm/portmux.h>
  47 #include <asm/dpmc.h>
  48
  49 /*
  50  * Name the Board for the /proc/cpuinfo
  51  */
  52 const char bfin_board_name[] = "ADDS-BF533-STAMP";
  53
  54 #if defined(CONFIG_RTC_DRV_BFIN) || defined(CONFIG_RTC_DRV_BFIN_MODULE)
  55 static struct platform_device rtc_device = {
  56         .name = "rtc-bfin",
  57         .id   = -1,
  58 };
  59 #endif
  60
  61 /*
  62  *  Driver needs to know address, irq and flag pin.
  63  */
  64 #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
  65 static struct resource smc91x_resources[] = {
  66         {
  67                 .name = "smc91x-regs",
  68                 .start = 0x20300300,
  69                 .end = 0x20300300 + 16,
  70                 .flags = IORESOURCE_MEM,
  71         }, {
  72                 .start = IRQ_PF7,
  73                 .end = IRQ_PF7,
  74                 .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL,
  75         },
  76 };
  77
  78 static struct platform_device smc91x_device = {
  79         .name = "smc91x",
  80         .id = 0,
  81         .num_resources = ARRAY_SIZE(smc91x_resources),
  82         .resource = smc91x_resources,
  83 };
  84 #endif
  85
  86 #if defined(CONFIG_FB_BFIN_7393) || defined(CONFIG_FB_BFIN_7393_MODULE)
  87 static struct platform_device bfin_fb_adv7393_device = {
  88         .name = "bfin-adv7393",
  89 };
  90 #endif
  91
  92 #if defined(CONFIG_USB_NET2272) || defined(CONFIG_USB_NET2272_MODULE)
  93 static struct resource net2272_bfin_resources[] = {
  94         {
  95                 .start = 0x20300000,
  96                 .end = 0x20300000 + 0x100,
  97                 .flags = IORESOURCE_MEM,
  98         }, {
  99                 .start = IRQ_PF10,
 100                 .end = IRQ_PF10,
 101                 .flags = IORESOURCE_IRQ | IORESOURCE_IRQ_HIGHLEVEL,
 102         },
 103 };
 104
 105 static struct platform_device net2272_bfin_device = {
 106         .name = "net2272",
 107         .id = -1,
 108         .num_resources = ARRAY_SIZE(net2272_bfin_resources),
 109         .resource = net2272_bfin_resources,
 110 };
 111 #endif
 112
 113 #if defined(CONFIG_MTD_BFIN_ASYNC) || defined(CONFIG_MTD_BFIN_ASYNC_MODULE)
 114 static struct mtd_partition stamp_partitions[] = {
 115         {
 116                 .name   = "bootloader(nor)",
 117                 .size   = 0x40000,
 118                 .offset = 0,
 119         }, {
 120                 .name   = "linux kernel(nor)",
 121                 .size   = 0xE0000,
 122                 .offset = MTDPART_OFS_APPEND,
 123         }, {
 124                 .name   = "file system(nor)",
 125                 .size   = MTDPART_SIZ_FULL,
 126                 .offset = MTDPART_OFS_APPEND,
 127         }
 128 };
 129
 130 static struct physmap_flash_data stamp_flash_data = {
 131         .width    = 2,
 132         .parts    = stamp_partitions,
 133         .nr_parts = ARRAY_SIZE(stamp_partitions),
 134 };
 135
 136 static struct resource stamp_flash_resource[] = {
 137         {
 138                 .name  = "cfi_probe",
 139                 .start = 0x20000000,
 140                 .end   = 0x203fffff,
 141                 .flags = IORESOURCE_MEM,
 142         }, {
 143                 .start = 0x7BB07BB0,    /* AMBCTL0 setting when accessing flash */
 144                 .end   = 0x7BB07BB0,    /* AMBCTL1 setting when accessing flash */
 145                 .flags = IORESOURCE_MEM,
 146         }, {
 147                 .start = GPIO_PF0,
 148                 .flags = IORESOURCE_IRQ,
 149         }
 150 };
 151
 152 static struct platform_device stamp_flash_device = {
 153         .name          = "bfin-async-flash",
 154         .id            = 0,
 155         .dev = {
 156                 .platform_data = &stamp_flash_data,
 157         },
 158         .num_resources = ARRAY_SIZE(stamp_flash_resource),
 159         .resource      = stamp_flash_resource,
 160 };
 161 #endif
 162
 163 #if defined(CONFIG_MTD_M25P80) || defined(CONFIG_MTD_M25P80_MODULE)
 164 static struct mtd_partition bfin_spi_flash_partitions[] = {
 165         {
 166                 .name = "bootloader(spi)",
 167                 .size = 0x00040000,
 168                 .offset = 0,
 169                 .mask_flags = MTD_CAP_ROM
 170         }, {
 171                 .name = "linux kernel(spi)",
 172                 .size = 0xe0000,
 173                 .offset = MTDPART_OFS_APPEND,
 174         }, {
 175                 .name = "file system(spi)",
 176                 .size = MTDPART_SIZ_FULL,
 177                 .offset = MTDPART_OFS_APPEND,
 178         }
 179 };
 180
 181 static struct flash_platform_data bfin_spi_flash_data = {
 182         .name = "m25p80",
 183         .parts = bfin_spi_flash_partitions,
 184         .nr_parts = ARRAY_SIZE(bfin_spi_flash_partitions),
 185         .type = "m25p64",
 186 };
 187
 188 /* SPI flash chip (m25p64) */
 189 static struct bfin5xx_spi_chip spi_flash_chip_info = {
 190         .enable_dma = 0,         /* use dma transfer with this chip*/
 191         .bits_per_word = 8,
 192 };
 193 #endif
 194
 195 #if defined(CONFIG_SPI_ADC_BF533) || defined(CONFIG_SPI_ADC_BF533_MODULE)
 196 /* SPI ADC chip */
 197 static struct bfin5xx_spi_chip spi_adc_chip_info = {
 198         .enable_dma = 1,         /* use dma transfer with this chip*/
 199         .bits_per_word = 16,
 200 };
 201 #endif
 202
 203 #if defined(CONFIG_SND_BLACKFIN_AD1836) || defined(CONFIG_SND_BLACKFIN_AD1836_MODULE)
 204 static struct bfin5xx_spi_chip ad1836_spi_chip_info = {
 205         .enable_dma = 0,
 206         .bits_per_word = 16,
 207 };
 208 #endif
 209
 210 #if defined(CONFIG_PBX)
 211 static struct bfin5xx_spi_chip spi_si3xxx_chip_info = {
 212         .ctl_reg        = 0x4, /* send zero */
 213         .enable_dma     = 0,
 214         .bits_per_word  = 8,
 215         .cs_change_per_word = 1,
 216 };
 217 #endif
 218
 219 #if defined(CONFIG_SPI_MMC) || defined(CONFIG_SPI_MMC_MODULE)
 220 static struct bfin5xx_spi_chip spi_mmc_chip_info = {
 221         .enable_dma = 1,
 222         .bits_per_word = 8,
 223 };
 224 #endif
 225
 226 #if defined(CONFIG_SPI_SPIDEV) || defined(CONFIG_SPI_SPIDEV_MODULE)
 227 static struct bfin5xx_spi_chip spidev_chip_info = {
 228         .enable_dma = 0,
 229         .bits_per_word = 8,
 230 };
 231 #endif
 232
 233 static struct spi_board_info bfin_spi_board_info[] __initdata = {
 234 #if defined(CONFIG_MTD_M25P80) || defined(CONFIG_MTD_M25P80_MODULE)
 235         {
 236                 /* the modalias must be the same as spi device driver name */
 237                 .modalias = "m25p80", /* Name of spi_driver for this device */
 238                 .max_speed_hz = 25000000,     /* max spi clock (SCK) speed in HZ */
 239                 .bus_num = 0, /* Framework bus number */
 240                 .chip_select = 2, /* Framework chip select. On STAMP537 it is SPISSEL2*/
 241                 .platform_data = &bfin_spi_flash_data,
 242                 .controller_data = &spi_flash_chip_info,
 243                 .mode = SPI_MODE_3,
 244         },
 245 #endif
 246
 247 #if defined(CONFIG_SPI_ADC_BF533) || defined(CONFIG_SPI_ADC_BF533_MODULE)
 248         {
 249                 .modalias = "bfin_spi_adc", /* Name of spi_driver for this device */
 250                 .max_speed_hz = 6250000,     /* max spi clock (SCK) speed in HZ */
 251                 .bus_num = 0, /* Framework bus number */
 252                 .chip_select = 1, /* Framework chip select. */
 253                 .platform_data = NULL, /* No spi_driver specific config */
 254                 .controller_data = &spi_adc_chip_info,
 255         },
 256 #endif
 257
 258 #if defined(CONFIG_SND_BLACKFIN_AD1836) || defined(CONFIG_SND_BLACKFIN_AD1836_MODULE)
 259         {
 260                 .modalias = "ad1836-spi",
 261                 .max_speed_hz = 31250000,     /* max spi clock (SCK) speed in HZ */
 262                 .bus_num = 0,
 263                 .chip_select = CONFIG_SND_BLACKFIN_SPI_PFBIT,
 264                 .controller_data = &ad1836_spi_chip_info,
 265         },
 266 #endif
 267
 268 #if defined(CONFIG_SPI_MMC) || defined(CONFIG_SPI_MMC_MODULE)
 269         {
 270                 .modalias = "spi_mmc_dummy",
 271                 .max_speed_hz = 20000000,     /* max spi clock (SCK) speed in HZ */
 272                 .bus_num = 0,
 273                 .chip_select = 0,
 274                 .platform_data = NULL,
 275                 .controller_data = &spi_mmc_chip_info,
 276                 .mode = SPI_MODE_3,
 277         },
 278         {
 279                 .modalias = "spi_mmc",
 280                 .max_speed_hz = 20000000,     /* max spi clock (SCK) speed in HZ */
 281                 .bus_num = 0,
 282                 .chip_select = CONFIG_SPI_MMC_CS_CHAN,
 283                 .platform_data = NULL,
 284                 .controller_data = &spi_mmc_chip_info,
 285                 .mode = SPI_MODE_3,
 286         },
 287 #endif
 288
 289 #if defined(CONFIG_PBX)
 290         {
 291                 .modalias = "fxs-spi",
 292                 .max_speed_hz = 12500000,     /* max spi clock (SCK) speed in HZ */
 293                 .bus_num = 0,
 294                 .chip_select = 8 - CONFIG_J11_JUMPER,
 295                 .controller_data = &spi_si3xxx_chip_info,
 296                 .mode = SPI_MODE_3,
 297         },
 298         {
 299                 .modalias = "fxo-spi",
 300                 .max_speed_hz = 12500000,     /* max spi clock (SCK) speed in HZ */
 301                 .bus_num = 0,
 302                 .chip_select = 8 - CONFIG_J19_JUMPER,
 303                 .controller_data = &spi_si3xxx_chip_info,
 304                 .mode = SPI_MODE_3,
 305         },
 306 #endif
 307
 308 #if defined(CONFIG_SPI_SPIDEV) || defined(CONFIG_SPI_SPIDEV_MODULE)
 309         {
 310                 .modalias = "spidev",
 311                 .max_speed_hz = 3125000,     /* max spi clock (SCK) speed in HZ */
 312                 .bus_num = 0,
 313                 .chip_select = 1,
 314                 .controller_data = &spidev_chip_info,
 315         },
 316 #endif
 317 };
 318
 319 #if defined(CONFIG_SPI_BFIN) || defined(CONFIG_SPI_BFIN_MODULE)
 320 /* SPI (0) */
 321 static struct resource bfin_spi0_resource[] = {
 322         [0] = {
 323                 .start = SPI0_REGBASE,
 324                 .end   = SPI0_REGBASE + 0xFF,
 325                 .flags = IORESOURCE_MEM,
 326         },
 327         [1] = {
 328                 .start = CH_SPI,
 329                 .end   = CH_SPI,
 330                 .flags = IORESOURCE_IRQ,
 331         }
 332 };
 333
 334 /* SPI controller data */
 335 static struct bfin5xx_spi_master bfin_spi0_info = {
 336         .num_chipselect = 8,
 337         .enable_dma = 1,  /* master has the ability to do dma transfer */
 338         .pin_req = {P_SPI0_SCK, P_SPI0_MISO, P_SPI0_MOSI, 0},
 339 };
 340
 341 static struct platform_device bfin_spi0_device = {
 342         .name = "bfin-spi",
 343         .id = 0, /* Bus number */
 344         .num_resources = ARRAY_SIZE(bfin_spi0_resource),
 345         .resource = bfin_spi0_resource,
 346         .dev = {
 347                 .platform_data = &bfin_spi0_info, /* Passed to driver */
 348         },
 349 };
 350 #endif  /* spi master and devices */
 351
 352 #if defined(CONFIG_FB_BF537_LQ035) || defined(CONFIG_FB_BF537_LQ035_MODULE)
 353 static struct platform_device bfin_fb_device = {
 354         .name = "bf537-fb",
 355 };
 356 #endif
 357
 358 #if defined(CONFIG_SERIAL_BFIN) || defined(CONFIG_SERIAL_BFIN_MODULE)
 359 static struct resource bfin_uart_resources[] = {
 360         {
 361                 .start = 0xFFC00400,
 362                 .end = 0xFFC004FF,
 363                 .flags = IORESOURCE_MEM,
 364         },
 365 };
 366
 367 static struct platform_device bfin_uart_device = {
 368         .name = "bfin-uart",
 369         .id = 1,
 370         .num_resources = ARRAY_SIZE(bfin_uart_resources),
 371         .resource = bfin_uart_resources,
 372 };
 373 #endif
 374
 375 #if defined(CONFIG_BFIN_SIR) || defined(CONFIG_BFIN_SIR_MODULE)
 376 static struct resource bfin_sir_resources[] = {
 377 #ifdef CONFIG_BFIN_SIR0
 378         {
 379                 .start = 0xFFC00400,
 380                 .end = 0xFFC004FF,
 381                 .flags = IORESOURCE_MEM,
 382         },
 383 #endif
 384 };
 385
 386 static struct platform_device bfin_sir_device = {
 387         .name = "bfin_sir",
 388         .id = 0,
 389         .num_resources = ARRAY_SIZE(bfin_sir_resources),
 390         .resource = bfin_sir_resources,
 391 };
 392 #endif
 393
 394 #if defined(CONFIG_SERIAL_BFIN_SPORT) || defined(CONFIG_SERIAL_BFIN_SPORT_MODULE)
 395 static struct platform_device bfin_sport0_uart_device = {
 396         .name = "bfin-sport-uart",
 397         .id = 0,
 398 };
 399
 400 static struct platform_device bfin_sport1_uart_device = {
 401         .name = "bfin-sport-uart",
 402         .id = 1,
 403 };
 404 #endif
 405
 406 #if defined(CONFIG_KEYBOARD_GPIO) || defined(CONFIG_KEYBOARD_GPIO_MODULE)
 407 #include <linux/input.h>
 408 #include <linux/gpio_keys.h>
 409
 410 static struct gpio_keys_button bfin_gpio_keys_table[] = {
 411         {BTN_0, GPIO_PF5, 0, "gpio-keys: BTN0"},
 412         {BTN_1, GPIO_PF6, 0, "gpio-keys: BTN1"},
 413         {BTN_2, GPIO_PF8, 0, "gpio-keys: BTN2"},
 414 };
 415
 416 static struct gpio_keys_platform_data bfin_gpio_keys_data = {
 417         .buttons        = bfin_gpio_keys_table,
 418         .nbuttons       = ARRAY_SIZE(bfin_gpio_keys_table),
 419 };
 420
 421 static struct platform_device bfin_device_gpiokeys = {
 422         .name      = "gpio-keys",
 423         .dev = {
 424                 .platform_data = &bfin_gpio_keys_data,
 425         },
 426 };
 427 #endif
 428
 429 static struct resource bfin_gpios_resources = {
 430         .start = 0,
 431         .end   = MAX_BLACKFIN_GPIOS - 1,
 432         .flags = IORESOURCE_IRQ,
 433 };
 434
 435 static struct platform_device bfin_gpios_device = {
 436         .name = "simple-gpio",
 437         .id = -1,
 438         .num_resources = 1,
 439         .resource = &bfin_gpios_resources,
 440 };
 441
 442 #if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
 443 #include <linux/i2c-gpio.h>
 444
 445 static struct i2c_gpio_platform_data i2c_gpio_data = {
 446         .sda_pin                = 2,
 447         .scl_pin                = 3,
 448         .sda_is_open_drain      = 0,
 449         .scl_is_open_drain      = 0,
 450         .udelay                 = 40,
 451 };
 452
 453 static struct platform_device i2c_gpio_device = {
 454         .name           = "i2c-gpio",
 455         .id             = 0,
 456         .dev            = {
 457                 .platform_data  = &i2c_gpio_data,
 458         },
 459 };
 460 #endif
 461
 462 #ifdef CONFIG_I2C_BOARDINFO
 463 static struct i2c_board_info __initdata bfin_i2c_board_info[] = {
 464 #if defined(CONFIG_JOYSTICK_AD7142) || defined(CONFIG_JOYSTICK_AD7142_MODULE)
 465         {
 466                 I2C_BOARD_INFO("ad7142_joystick", 0x2C),
 467                 .irq = 39,
 468         },
 469 #endif
 470 #if defined(CONFIG_TWI_LCD) || defined(CONFIG_TWI_LCD_MODULE)
 471         {
 472                 I2C_BOARD_INFO("pcf8574_lcd", 0x22),
 473         },
 474 #endif
 475 #if defined(CONFIG_TWI_KEYPAD) || defined(CONFIG_TWI_KEYPAD_MODULE)
 476         {
 477                 I2C_BOARD_INFO("pcf8574_keypad", 0x27),
 478                 .irq = 39,
 479         },
 480 #endif
 481 };
 482 #endif
 483
 484 static const unsigned int cclk_vlev_datasheet[] =
 485 {
 486         VRPAIR(VLEV_085, 250000000),
 487         VRPAIR(VLEV_090, 376000000),
 488         VRPAIR(VLEV_095, 426000000),
 489         VRPAIR(VLEV_100, 426000000),
 490         VRPAIR(VLEV_105, 476000000),
 491         VRPAIR(VLEV_110, 476000000),
 492         VRPAIR(VLEV_115, 476000000),
 493         VRPAIR(VLEV_120, 600000000),
 494         VRPAIR(VLEV_125, 600000000),
 495         VRPAIR(VLEV_130, 600000000),
 496 };
 497
 498 static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
 499         .tuple_tab = cclk_vlev_datasheet,
 500         .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
 501         .vr_settling_time = 25 /* us */,
 502 };
 503
 504 static struct platform_device bfin_dpmc = {
 505         .name = "bfin dpmc",
 506         .dev = {
 507                 .platform_data = &bfin_dmpc_vreg_data,
 508         },
 509 };
 510
 511 static struct platform_device *stamp_devices[] __initdata = {
 512
 513         &bfin_dpmc,
 514
 515 #if defined(CONFIG_RTC_DRV_BFIN) || defined(CONFIG_RTC_DRV_BFIN_MODULE)
 516         &rtc_device,
 517 #endif
 518
 519 #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
 520         &smc91x_device,
 521 #endif
 522
 523 #if defined(CONFIG_FB_BFIN_7393) || defined(CONFIG_FB_BFIN_7393_MODULE)
 524         &bfin_fb_adv7393_device,
 525 #endif
 526
 527 #if defined(CONFIG_USB_NET2272) || defined(CONFIG_USB_NET2272_MODULE)
 528         &net2272_bfin_device,
 529 #endif
 530
 531 #if defined(CONFIG_SPI_BFIN) || defined(CONFIG_SPI_BFIN_MODULE)
 532         &bfin_spi0_device,
 533 #endif
 534
 535 #if defined(CONFIG_SERIAL_BFIN) || defined(CONFIG_SERIAL_BFIN_MODULE)
 536         &bfin_uart_device,
 537 #endif
 538
 539 #if defined(CONFIG_BFIN_SIR) || defined(CONFIG_BFIN_SIR_MODULE)
 540         &bfin_sir_device,
 541 #endif
 542
 543 #if defined(CONFIG_SERIAL_BFIN_SPORT) || defined(CONFIG_SERIAL_BFIN_SPORT_MODULE)
 544         &bfin_sport0_uart_device,
 545         &bfin_sport1_uart_device,
 546 #endif
 547
 548 #if defined(CONFIG_KEYBOARD_GPIO) || defined(CONFIG_KEYBOARD_GPIO_MODULE)
 549         &bfin_device_gpiokeys,
 550 #endif
 551
 552 #if defined(CONFIG_I2C_GPIO) || defined(CONFIG_I2C_GPIO_MODULE)
 553         &i2c_gpio_device,
 554 #endif
 555
 556         &bfin_gpios_device,
 557
 558 #if defined(CONFIG_MTD_BFIN_ASYNC) || defined(CONFIG_MTD_BFIN_ASYNC_MODULE)
 559         &stamp_flash_device,
 560 #endif
 561 };
 562
 563 static int __init stamp_init(void)
 564 {
 565         int ret;
 566
 567         printk(KERN_INFO "%s(): registering device resources\n", __func__);
 568
 569 #ifdef CONFIG_I2C_BOARDINFO
 570         i2c_register_board_info(0, bfin_i2c_board_info,
 571                                 ARRAY_SIZE(bfin_i2c_board_info));
 572 #endif
 573
 574         ret = platform_add_devices(stamp_devices, ARRAY_SIZE(stamp_devices));
 575         if (ret < 0)
 576                 return ret;
 577
 578 #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
 579         /* setup BF533_STAMP CPLD to route AMS3 to Ethernet MAC */
 580         bfin_write_FIO_DIR(bfin_read_FIO_DIR() | PF0);
 581         bfin_write_FIO_FLAG_S(PF0);
 582         SSYNC();
 583 #endif
 584
 585         spi_register_board_info(bfin_spi_board_info, ARRAY_SIZE(bfin_spi_board_info));
 586         return 0;
 587 }
 588
 589 arch_initcall(stamp_init);
 590
 591 void native_machine_restart(char *cmd)
 592 {
 593         /* workaround pull up on cpld / flash pin not being strong enough */
 594         bfin_write_FIO_INEN(~PF0);
 595         bfin_write_FIO_DIR(PF0);
 596         bfin_write_FIO_FLAG_C(PF0);
 597 }