1 /* 2 * (C) Copyright 2004-2011 3 * Texas Instruments, <www.ti.com> 4 * 5 * Author : 6 * Sunil Kumar <sunilsaini05@gmail.com> 7 * Shashi Ranjan <shashiranjanmca05@gmail.com> 8 * 9 * Derived from Beagle Board and 3430 SDP code by 10 * Richard Woodruff <r-woodruff2@ti.com> 11 * Syed Mohammed Khasim <khasim@ti.com> 12 * 13 * 14 * See file CREDITS for list of people who contributed to this 15 * project. 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License as 19 * published by the Free Software Foundation; either version 2 of 20 * the License, or (at your option) any later version. 21 * 22 * This program is distributed in the hope that it will be useful, 23 * but WITHOUT ANY WARRANTY; without even the implied warranty of 24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 25 * GNU General Public License for more details. 26 * 27 * You should have received a copy of the GNU General Public License 28 * along with this program; if not, write to the Free Software 29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 30 * MA 02111-1307 USA 31 */ 32 #include <common.h> 33 #ifdef CONFIG_STATUS_LED 34 #include <status_led.h> 35 #endif 36 #include <twl4030.h> 37 #include <linux/mtd/nand.h> 38 #include <asm/io.h> 39 #include <asm/arch/mmc_host_def.h> 40 #include <asm/arch/mux.h> 41 #include <asm/arch/mem.h> 42 #include <asm/arch/sys_proto.h> 43 #include <asm/gpio.h> 44 #include <asm/mach-types.h> 45 #ifdef CONFIG_USB_EHCI 46 #include <usb.h> 47 #include <asm/arch/clocks.h> 48 #include <asm/arch/clocks_omap3.h> 49 #include <asm/arch/ehci_omap3.h> 50 /* from drivers/usb/host/ehci-core.h */ 51 extern struct ehci_hccr *hccr; 52 extern volatile struct ehci_hcor *hcor; 53 #endif 54 #include "beagle.h" 55 #include <command.h> 56 57 #define pr_debug(fmt, args...) debug(fmt, ##args) 58 59 #define TWL4030_I2C_BUS 0 60 #define EXPANSION_EEPROM_I2C_BUS 1 61 #define EXPANSION_EEPROM_I2C_ADDRESS 0x50 62 63 #define TINCANTOOLS_ZIPPY 0x01000100 64 #define TINCANTOOLS_ZIPPY2 0x02000100 65 #define TINCANTOOLS_TRAINER 0x04000100 66 #define TINCANTOOLS_SHOWDOG 0x03000100 67 #define KBADC_BEAGLEFPGA 0x01000600 68 #define LW_BEAGLETOUCH 0x01000700 69 #define BRAINMUX_LCDOG 0x01000800 70 #define BRAINMUX_LCDOGTOUCH 0x02000800 71 #define BBTOYS_WIFI 0x01000B00 72 #define BBTOYS_VGA 0x02000B00 73 #define BBTOYS_LCD 0x03000B00 74 #define BCT_BRETTL3 0x01000F00 75 #define BEAGLE_NO_EEPROM 0xffffffff 76 77 DECLARE_GLOBAL_DATA_PTR; 78 79 static struct { 80 unsigned int device_vendor; 81 unsigned char revision; 82 unsigned char content; 83 char fab_revision[8]; 84 char env_var[16]; 85 char env_setting[64]; 86 } expansion_config; 87 88 /* 89 * Routine: board_init 90 * Description: Early hardware init. 91 */ 92 int board_init(void) 93 { 94 gpmc_init(); /* in SRAM or SDRAM, finish GPMC */ 95 /* board id for Linux */ 96 gd->bd->bi_arch_number = MACH_TYPE_OMAP3_BEAGLE; 97 /* boot param addr */ 98 gd->bd->bi_boot_params = (OMAP34XX_SDRC_CS0 + 0x100); 99 100 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT) 101 status_led_set (STATUS_LED_BOOT, STATUS_LED_ON); 102 #endif 103 104 return 0; 105 } 106 107 /* 108 * Routine: get_board_revision 109 * Description: Detect if we are running on a Beagle revision Ax/Bx, 110 * C1/2/3, C4 or xM. This can be done by reading 111 * the level of GPIO173, GPIO172 and GPIO171. This should 112 * result in 113 * GPIO173, GPIO172, GPIO171: 1 1 1 => Ax/Bx 114 * GPIO173, GPIO172, GPIO171: 1 1 0 => C1/2/3 115 * GPIO173, GPIO172, GPIO171: 1 0 1 => C4 116 * GPIO173, GPIO172, GPIO171: 0 0 0 => xM 117 */ 118 int get_board_revision(void) 119 { 120 int revision; 121 122 if (!gpio_request(171, "") && 123 !gpio_request(172, "") && 124 !gpio_request(173, "")) { 125 126 gpio_direction_input(171); 127 gpio_direction_input(172); 128 gpio_direction_input(173); 129 130 revision = gpio_get_value(173) << 2 | 131 gpio_get_value(172) << 1 | 132 gpio_get_value(171); 133 } else { 134 printf("Error: unable to acquire board revision GPIOs\n"); 135 revision = -1; 136 } 137 138 return revision; 139 } 140 141 #ifdef CONFIG_SPL_BUILD 142 /* 143 * Routine: get_board_mem_timings 144 * Description: If we use SPL then there is no x-loader nor config header 145 * so we have to setup the DDR timings ourself on both banks. 146 */ 147 void get_board_mem_timings(u32 *mcfg, u32 *ctrla, u32 *ctrlb, u32 *rfr_ctrl, 148 u32 *mr) 149 { 150 int pop_mfr, pop_id; 151 152 /* 153 * We need to identify what PoP memory is on the board so that 154 * we know what timings to use. If we can't identify it then 155 * we know it's an xM. To map the ID values please see nand_ids.c 156 */ 157 identify_nand_chip(&pop_mfr, &pop_id); 158 159 *mr = MICRON_V_MR_165; 160 switch (get_board_revision()) { 161 case REVISION_C4: 162 if (pop_mfr == NAND_MFR_STMICRO && pop_id == 0xba) { 163 /* 512MB DDR */ 164 *mcfg = NUMONYX_V_MCFG_165(512 << 20); 165 *ctrla = NUMONYX_V_ACTIMA_165; 166 *ctrlb = NUMONYX_V_ACTIMB_165; 167 *rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz; 168 break; 169 } else if (pop_mfr == NAND_MFR_MICRON && pop_id == 0xbc) { 170 /* Beagleboard Rev C5, 256MB DDR */ 171 *mcfg = MICRON_V_MCFG_200(256 << 20); 172 *ctrla = MICRON_V_ACTIMA_200; 173 *ctrlb = MICRON_V_ACTIMB_200; 174 *rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_200MHz; 175 break; 176 } 177 case REVISION_XM_A: 178 case REVISION_XM_B: 179 case REVISION_XM_C: 180 if (pop_mfr == 0) { 181 /* 256MB DDR */ 182 *mcfg = MICRON_V_MCFG_200(256 << 20); 183 *ctrla = MICRON_V_ACTIMA_200; 184 *ctrlb = MICRON_V_ACTIMB_200; 185 *rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_200MHz; 186 } else { 187 /* 512MB DDR */ 188 *mcfg = NUMONYX_V_MCFG_165(512 << 20); 189 *ctrla = NUMONYX_V_ACTIMA_165; 190 *ctrlb = NUMONYX_V_ACTIMB_165; 191 *rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz; 192 } 193 break; 194 default: 195 /* Assume 128MB and Micron/165MHz timings to be safe */ 196 *mcfg = MICRON_V_MCFG_165(128 << 20); 197 *ctrla = MICRON_V_ACTIMA_165; 198 *ctrlb = MICRON_V_ACTIMB_165; 199 *rfr_ctrl = SDP_3430_SDRC_RFR_CTRL_165MHz; 200 } 201 } 202 #endif 203 204 /* 205 * Routine: get_expansion_id 206 * Description: This function checks for expansion board by checking I2C 207 * bus 1 for the availability of an AT24C01B serial EEPROM. 208 * returns the device_vendor field from the EEPROM 209 */ 210 unsigned int get_expansion_id(void) 211 { 212 i2c_set_bus_num(EXPANSION_EEPROM_I2C_BUS); 213 214 /* return BEAGLE_NO_EEPROM if eeprom doesn't respond */ 215 if (i2c_probe(EXPANSION_EEPROM_I2C_ADDRESS) == 1) { 216 i2c_set_bus_num(TWL4030_I2C_BUS); 217 return BEAGLE_NO_EEPROM; 218 } 219 220 /* read configuration data */ 221 i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 1, (u8 *)&expansion_config, 222 sizeof(expansion_config)); 223 224 i2c_set_bus_num(TWL4030_I2C_BUS); 225 226 return expansion_config.device_vendor; 227 } 228 229 /* 230 * Configure DSS to display background color on DVID 231 * Configure VENC to display color bar on S-Video 232 */ 233 void beagle_display_init(void) 234 { 235 omap3_dss_venc_config(&venc_config_std_tv, VENC_HEIGHT, VENC_WIDTH); 236 switch (get_board_revision()) { 237 case REVISION_AXBX: 238 case REVISION_CX: 239 case REVISION_C4: 240 omap3_dss_panel_config(&dvid_cfg); 241 break; 242 case REVISION_XM_A: 243 case REVISION_XM_B: 244 case REVISION_XM_C: 245 default: 246 omap3_dss_panel_config(&dvid_cfg_xm); 247 break; 248 } 249 } 250 251 /* 252 * Routine: misc_init_r 253 * Description: Configure board specific parts 254 */ 255 int misc_init_r(void) 256 { 257 struct gpio *gpio5_base = (struct gpio *)OMAP34XX_GPIO5_BASE; 258 struct gpio *gpio6_base = (struct gpio *)OMAP34XX_GPIO6_BASE; 259 struct control_prog_io *prog_io_base = (struct control_prog_io *)OMAP34XX_CTRL_BASE; 260 261 /* Enable i2c2 pullup resisters */ 262 writel(~(PRG_I2C2_PULLUPRESX), &prog_io_base->io1); 263 264 switch (get_board_revision()) { 265 case REVISION_AXBX: 266 printf("Beagle Rev Ax/Bx\n"); 267 setenv("beaglerev", "AxBx"); 268 break; 269 case REVISION_CX: 270 printf("Beagle Rev C1/C2/C3\n"); 271 setenv("beaglerev", "Cx"); 272 MUX_BEAGLE_C(); 273 break; 274 case REVISION_C4: 275 printf("Beagle Rev C4\n"); 276 setenv("beaglerev", "C4"); 277 MUX_BEAGLE_C(); 278 /* Set VAUX2 to 1.8V for EHCI PHY */ 279 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED, 280 TWL4030_PM_RECEIVER_VAUX2_VSEL_18, 281 TWL4030_PM_RECEIVER_VAUX2_DEV_GRP, 282 TWL4030_PM_RECEIVER_DEV_GRP_P1); 283 break; 284 case REVISION_XM_A: 285 printf("Beagle xM Rev A\n"); 286 setenv("beaglerev", "xMA"); 287 MUX_BEAGLE_XM(); 288 /* Set VAUX2 to 1.8V for EHCI PHY */ 289 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED, 290 TWL4030_PM_RECEIVER_VAUX2_VSEL_18, 291 TWL4030_PM_RECEIVER_VAUX2_DEV_GRP, 292 TWL4030_PM_RECEIVER_DEV_GRP_P1); 293 break; 294 case REVISION_XM_B: 295 printf("Beagle xM Rev B\n"); 296 setenv("beaglerev", "xMB"); 297 MUX_BEAGLE_XM(); 298 /* Set VAUX2 to 1.8V for EHCI PHY */ 299 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED, 300 TWL4030_PM_RECEIVER_VAUX2_VSEL_18, 301 TWL4030_PM_RECEIVER_VAUX2_DEV_GRP, 302 TWL4030_PM_RECEIVER_DEV_GRP_P1); 303 break; 304 case REVISION_XM_C: 305 printf("Beagle xM Rev C\n"); 306 setenv("beaglerev", "xMC"); 307 MUX_BEAGLE_XM(); 308 /* Set VAUX2 to 1.8V for EHCI PHY */ 309 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED, 310 TWL4030_PM_RECEIVER_VAUX2_VSEL_18, 311 TWL4030_PM_RECEIVER_VAUX2_DEV_GRP, 312 TWL4030_PM_RECEIVER_DEV_GRP_P1); 313 break; 314 default: 315 printf("Beagle unknown 0x%02x\n", get_board_revision()); 316 MUX_BEAGLE_XM(); 317 /* Set VAUX2 to 1.8V for EHCI PHY */ 318 twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED, 319 TWL4030_PM_RECEIVER_VAUX2_VSEL_18, 320 TWL4030_PM_RECEIVER_VAUX2_DEV_GRP, 321 TWL4030_PM_RECEIVER_DEV_GRP_P1); 322 } 323 324 switch (get_expansion_id()) { 325 case TINCANTOOLS_ZIPPY: 326 printf("Recognized Tincantools Zippy board (rev %d %s)\n", 327 expansion_config.revision, 328 expansion_config.fab_revision); 329 MUX_TINCANTOOLS_ZIPPY(); 330 setenv("buddy", "zippy"); 331 break; 332 case TINCANTOOLS_ZIPPY2: 333 printf("Recognized Tincantools Zippy2 board (rev %d %s)\n", 334 expansion_config.revision, 335 expansion_config.fab_revision); 336 MUX_TINCANTOOLS_ZIPPY(); 337 setenv("buddy", "zippy2"); 338 break; 339 case TINCANTOOLS_TRAINER: 340 printf("Recognized Tincantools Trainer board (rev %d %s)\n", 341 expansion_config.revision, 342 expansion_config.fab_revision); 343 MUX_TINCANTOOLS_ZIPPY(); 344 MUX_TINCANTOOLS_TRAINER(); 345 setenv("buddy", "trainer"); 346 break; 347 case TINCANTOOLS_SHOWDOG: 348 printf("Recognized Tincantools Showdow board (rev %d %s)\n", 349 expansion_config.revision, 350 expansion_config.fab_revision); 351 /* Place holder for DSS2 definition for showdog lcd */ 352 setenv("defaultdisplay", "showdoglcd"); 353 setenv("buddy", "showdog"); 354 break; 355 case KBADC_BEAGLEFPGA: 356 printf("Recognized KBADC Beagle FPGA board\n"); 357 MUX_KBADC_BEAGLEFPGA(); 358 setenv("buddy", "beaglefpga"); 359 break; 360 case LW_BEAGLETOUCH: 361 printf("Recognized Liquidware BeagleTouch board\n"); 362 setenv("buddy", "beagletouch"); 363 break; 364 case BRAINMUX_LCDOG: 365 printf("Recognized Brainmux LCDog board\n"); 366 setenv("buddy", "lcdog"); 367 break; 368 case BRAINMUX_LCDOGTOUCH: 369 printf("Recognized Brainmux LCDog Touch board\n"); 370 setenv("buddy", "lcdogtouch"); 371 break; 372 case BBTOYS_WIFI: 373 printf("Recognized BeagleBoardToys WiFi board\n"); 374 MUX_BBTOYS_WIFI() 375 setenv("buddy", "bbtoys-wifi"); 376 break;; 377 case BBTOYS_VGA: 378 printf("Recognized BeagleBoardToys VGA board\n"); 379 break;; 380 case BBTOYS_LCD: 381 printf("Recognized BeagleBoardToys LCD board\n"); 382 break;; 383 case BCT_BRETTL3: 384 printf("Recognized bct electronic GmbH brettl3 board\n"); 385 break; 386 case BEAGLE_NO_EEPROM: 387 printf("No EEPROM on expansion board\n"); 388 setenv("buddy", "none"); 389 break; 390 default: 391 printf("Unrecognized expansion board: %x\n", 392 expansion_config.device_vendor); 393 setenv("buddy", "unknown"); 394 } 395 396 if (expansion_config.content == 1) 397 setenv(expansion_config.env_var, expansion_config.env_setting); 398 399 twl4030_power_init(); 400 switch (get_board_revision()) { 401 case REVISION_XM_A: 402 case REVISION_XM_B: 403 twl4030_led_init(TWL4030_LED_LEDEN_LEDBON); 404 break; 405 default: 406 twl4030_led_init(TWL4030_LED_LEDEN_LEDAON | TWL4030_LED_LEDEN_LEDBON); 407 break; 408 } 409 410 /* Set GPIO states before they are made outputs */ 411 writel(GPIO23 | GPIO10 | GPIO8 | GPIO2 | GPIO1, 412 &gpio6_base->setdataout); 413 writel(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 | 414 GPIO15 | GPIO14 | GPIO13 | GPIO12, &gpio5_base->setdataout); 415 416 /* Configure GPIOs to output */ 417 writel(~(GPIO23 | GPIO10 | GPIO8 | GPIO2 | GPIO1), &gpio6_base->oe); 418 writel(~(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 | 419 GPIO15 | GPIO14 | GPIO13 | GPIO12), &gpio5_base->oe); 420 421 dieid_num_r(); 422 beagle_display_init(); 423 omap3_dss_enable(); 424 425 return 0; 426 } 427 428 /* 429 * Routine: set_muxconf_regs 430 * Description: Setting up the configuration Mux registers specific to the 431 * hardware. Many pins need to be moved from protect to primary 432 * mode. 433 */ 434 void set_muxconf_regs(void) 435 { 436 MUX_BEAGLE(); 437 } 438 439 #if defined(CONFIG_GENERIC_MMC) && !defined(CONFIG_SPL_BUILD) 440 int board_mmc_init(bd_t *bis) 441 { 442 omap_mmc_init(0); 443 return 0; 444 } 445 #endif 446 447 #ifdef CONFIG_USB_EHCI 448 449 #define GPIO_PHY_RESET 147 450 451 /* Reset is needed otherwise the kernel-driver will throw an error. */ 452 int ehci_hcd_stop(void) 453 { 454 pr_debug("Resetting OMAP3 EHCI\n"); 455 gpio_set_value(GPIO_PHY_RESET, 0); 456 writel(OMAP_UHH_SYSCONFIG_SOFTRESET, OMAP3_UHH_BASE + OMAP_UHH_SYSCONFIG); 457 /* disable USB clocks */ 458 struct prcm *prcm_base = (struct prcm *)PRCM_BASE; 459 sr32(&prcm_base->iclken_usbhost, 0, 1, 0); 460 sr32(&prcm_base->fclken_usbhost, 0, 2, 0); 461 sr32(&prcm_base->iclken3_core, 2, 1, 0); 462 sr32(&prcm_base->fclken3_core, 2, 1, 0); 463 return 0; 464 } 465 466 /* Call usb_stop() before starting the kernel */ 467 void show_boot_progress(int val) 468 { 469 if(val == 15) 470 usb_stop(); 471 } 472 473 /* 474 * Initialize the OMAP3 EHCI controller and PHY on the BeagleBoard. 475 * Based on "drivers/usb/host/ehci-omap.c" from Linux 2.6.37. 476 * See there for additional Copyrights. 477 */ 478 int ehci_hcd_init(void) 479 { 480 pr_debug("Initializing OMAP3 ECHI\n"); 481 482 /* Put the PHY in RESET */ 483 gpio_request(GPIO_PHY_RESET, ""); 484 gpio_direction_output(GPIO_PHY_RESET, 0); 485 gpio_set_value(GPIO_PHY_RESET, 0); 486 487 /* Hold the PHY in RESET for enough time till DIR is high */ 488 /* Refer: ISSUE1 */ 489 udelay(10); 490 491 struct prcm *prcm_base = (struct prcm *)PRCM_BASE; 492 /* Enable USBHOST_L3_ICLK (USBHOST_MICLK) */ 493 sr32(&prcm_base->iclken_usbhost, 0, 1, 1); 494 /* 495 * Enable USBHOST_48M_FCLK (USBHOST_FCLK1) 496 * and USBHOST_120M_FCLK (USBHOST_FCLK2) 497 */ 498 sr32(&prcm_base->fclken_usbhost, 0, 2, 3); 499 /* Enable USBTTL_ICLK */ 500 sr32(&prcm_base->iclken3_core, 2, 1, 1); 501 /* Enable USBTTL_FCLK */ 502 sr32(&prcm_base->fclken3_core, 2, 1, 1); 503 pr_debug("USB clocks enabled\n"); 504 505 /* perform TLL soft reset, and wait until reset is complete */ 506 writel(OMAP_USBTLL_SYSCONFIG_SOFTRESET, 507 OMAP3_USBTLL_BASE + OMAP_USBTLL_SYSCONFIG); 508 /* Wait for TLL reset to complete */ 509 while (!(readl(OMAP3_USBTLL_BASE + OMAP_USBTLL_SYSSTATUS) 510 & OMAP_USBTLL_SYSSTATUS_RESETDONE)); 511 pr_debug("TLL reset done\n"); 512 513 writel(OMAP_USBTLL_SYSCONFIG_ENAWAKEUP | 514 OMAP_USBTLL_SYSCONFIG_SIDLEMODE | 515 OMAP_USBTLL_SYSCONFIG_CACTIVITY, 516 OMAP3_USBTLL_BASE + OMAP_USBTLL_SYSCONFIG); 517 518 /* Put UHH in NoIdle/NoStandby mode */ 519 writel(OMAP_UHH_SYSCONFIG_ENAWAKEUP 520 | OMAP_UHH_SYSCONFIG_SIDLEMODE 521 | OMAP_UHH_SYSCONFIG_CACTIVITY 522 | OMAP_UHH_SYSCONFIG_MIDLEMODE, 523 OMAP3_UHH_BASE + OMAP_UHH_SYSCONFIG); 524 525 /* setup burst configurations */ 526 writel(OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN 527 | OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN 528 | OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN, 529 OMAP3_UHH_BASE + OMAP_UHH_HOSTCONFIG); 530 531 /* 532 * Refer ISSUE1: 533 * Hold the PHY in RESET for enough time till 534 * PHY is settled and ready 535 */ 536 udelay(10); 537 gpio_set_value(GPIO_PHY_RESET, 1); 538 539 hccr = (struct ehci_hccr *)(OMAP3_EHCI_BASE); 540 hcor = (struct ehci_hcor *)(OMAP3_EHCI_BASE + 0x10); 541 542 pr_debug("OMAP3 EHCI init done\n"); 543 return 0; 544 } 545 546 #endif /* CONFIG_USB_EHCI */ 547 548 #ifndef CONFIG_SPL_BUILD 549 /* 550 * This command returns the status of the user button on beagle xM 551 * Input - none 552 * Returns - 1 if button is held down 553 * 0 if button is not held down 554 */ 555 int do_userbutton(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 556 { 557 int button = 0; 558 int gpio; 559 560 /* 561 * pass address parameter as argv[0] (aka command name), 562 * and all remaining args 563 */ 564 switch (get_board_revision()) { 565 case REVISION_AXBX: 566 case REVISION_CX: 567 case REVISION_C4: 568 gpio = 7; 569 break; 570 case REVISION_XM_A: 571 case REVISION_XM_B: 572 case REVISION_XM_C: 573 default: 574 gpio = 4; 575 break; 576 } 577 gpio_request(gpio, ""); 578 gpio_direction_input(gpio); 579 printf("The user button is currently "); 580 if (gpio_get_value(gpio)) 581 { 582 button = 1; 583 printf("PRESSED.\n"); 584 } 585 else 586 { 587 button = 0; 588 printf("NOT pressed.\n"); 589 } 590 591 return !button; 592 } 593 594 /* -------------------------------------------------------------------- */ 595 596 U_BOOT_CMD( 597 userbutton, CONFIG_SYS_MAXARGS, 1, do_userbutton, 598 "Return the status of the BeagleBoard USER button", 599 "" 600 ); 601 #endif 602