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yeeloong_machdep.c revision 1.6 
      1 /*	$NetBSD: yeeloong_machdep.c,v 1.6 2014/03/29 19:28:28 christos Exp $	*/
      2 /*	$OpenBSD: yeeloong_machdep.c,v 1.16 2011/04/15 20:40:06 deraadt Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 2009, 2010 Miodrag Vallat.
      6  *
      7  * Permission to use, copy, modify, and distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 
     20 /*
     21  * Lemote {Fu,Lyn,Yee}loong specific code and configuration data.
     22  * (this file really ought to be named lemote_machdep.c by now)
     23  */
     24 
     25 #include <sys/cdefs.h>
     26 __KERNEL_RCSID(0, "$NetBSD: yeeloong_machdep.c,v 1.6 2014/03/29 19:28:28 christos Exp $");
     27 
     28 #include <sys/param.h>
     29 #include <sys/systm.h>
     30 #include <sys/device.h>
     31 #include <sys/types.h>
     32 
     33 #include <evbmips/loongson/autoconf.h>
     34 #include <mips/pmon/pmon.h>
     35 #include <evbmips/loongson/loongson_intr.h>
     36 #include <evbmips/loongson/loongson_bus_defs.h>
     37 #include <evbmips/loongson/loongson_isa.h>
     38 
     39 #include <dev/isa/isareg.h>
     40 #include <dev/isa/isavar.h>
     41 #include <dev/ic/i8259reg.h>
     42 
     43 #include <dev/pci/pcireg.h>
     44 #include <dev/pci/pcivar.h>
     45 #include <dev/pci/pcidevs.h>
     46 
     47 #include <mips/bonito/bonitoreg.h>
     48 #include <mips/bonito/bonitovar.h>
     49 
     50 #include <evbmips/loongson/dev/kb3310var.h>
     51 #include <evbmips/loongson/dev/glxreg.h>
     52 #include <evbmips/loongson/dev/glxvar.h>
     53 
     54 #include "com.h"
     55 #include "isa.h"
     56 #include "ykbec.h"
     57 
     58 #if NCOM > 0
     59 #include <sys/termios.h>
     60 #include <dev/ic/comvar.h>
     61 #endif
     62 
     63 #ifdef LOW_DEBUG
     64 #define DPRINTF(x) printf x
     65 #else
     66 #define DPRINTF(x)
     67 #endif
     68 
     69 void	 lemote_device_register(device_t, void *);
     70 void	 lemote_reset(void);
     71 
     72 void	 fuloong_powerdown(void);
     73 void	 fuloong_setup(void);
     74 
     75 void	 yeeloong_powerdown(void);
     76 
     77 void	 lemote_pci_attach_hook(device_t, device_t,
     78 	    struct pcibus_attach_args *);
     79 int	 lemote_intr_map(int, int, int, pci_intr_handle_t *);
     80 
     81 void	 lemote_isa_attach_hook(device_t, device_t,
     82 	    struct isabus_attach_args *);
     83 void	*lemote_isa_intr_establish(void *, int, int, int,
     84 	    int (*)(void *), void *);
     85 void	 lemote_isa_intr_disestablish(void *, void *);
     86 const struct evcnt * lemote_isa_intr_evcnt(void *, int);
     87 const char * lemote_isa_intr_string(void *, int, char *, size_t);
     88 
     89 uint	 lemote_get_isa_imr(void);
     90 uint	 lemote_get_isa_isr(void);
     91 void	 lemote_isa_intr(int, vaddr_t, uint32_t);
     92 
     93 const struct bonito_config lemote_bonito = {
     94 	.bc_adbase = 11,
     95 
     96 	.bc_gpioIE = LOONGSON_INTRMASK_GPIO,
     97 	.bc_intEdge = LOONGSON_INTRMASK_PCI_SYSERR |
     98 	    LOONGSON_INTRMASK_PCI_PARERR,
     99 	.bc_intSteer = 0,
    100 	.bc_intPol = LOONGSON_INTRMASK_DRAM_PARERR |
    101 	    LOONGSON_INTRMASK_PCI_SYSERR | LOONGSON_INTRMASK_PCI_PARERR |
    102 	    LOONGSON_INTRMASK_INT0 | LOONGSON_INTRMASK_INT1,
    103 
    104 	.bc_attach_hook = lemote_pci_attach_hook,
    105 };
    106 
    107 const struct legacy_io_range fuloong_legacy_ranges[] = {
    108 	/* isa */
    109 	{ IO_DMAPG + 4,	IO_DMAPG + 4 },
    110 	/* mcclock */
    111 	{ IO_RTC,	IO_RTC + 1 },
    112 	/* pciide */
    113 	{ 0x170,	0x170 + 7 },
    114 	{ 0x1f0,	0x1f0 + 7 },
    115 	{ 0x376,	0x376 },
    116 	{ 0x3f6,	0x3f6 },
    117 	/* com */
    118 	{ IO_COM1,	IO_COM1 + 8 },		/* IR port */
    119 	{ IO_COM2,	IO_COM2 + 8 },		/* serial port */
    120 
    121 	{ 0 }
    122 };
    123 
    124 const struct legacy_io_range lynloong_legacy_ranges[] = {
    125 	/* isa */
    126 	{ IO_DMAPG + 4,	IO_DMAPG + 4 },
    127 	/* mcclock */
    128 	{ IO_RTC,	IO_RTC + 1 },
    129 	/* pciide */
    130 	{ 0x170,	0x170 + 7 },
    131 	{ 0x1f0,	0x1f0 + 7 },
    132 	{ 0x376,	0x376 },
    133 	{ 0x3f6,	0x3f6 },
    134 #if 0	/* no external connector */
    135 	/* com */
    136 	{ IO_COM2,	IO_COM2 + 8 },
    137 #endif
    138 
    139 	{ 0 }
    140 };
    141 
    142 const struct legacy_io_range yeeloong_legacy_ranges[] = {
    143 	/* isa */
    144 	{ IO_DMAPG + 4,	IO_DMAPG + 4 },
    145 	/* pckbc */
    146 	{ IO_KBD,	IO_KBD },
    147 	{ IO_KBD + 4,	IO_KBD + 4 },
    148 	/* mcclock */
    149 	{ IO_RTC,	IO_RTC + 1 },
    150 	/* pciide */
    151 	{ 0x170,	0x170 + 7 },
    152 	{ 0x1f0,	0x1f0 + 7 },
    153 	{ 0x376,	0x376 },
    154 	{ 0x3f6,	0x3f6 },
    155 	/* kb3110b embedded controller */
    156 	{ 0x381,	0x383 },
    157 
    158 	{ 0 }
    159 };
    160 
    161 struct mips_isa_chipset lemote_isa_chipset = {
    162 	.ic_v = NULL,
    163 
    164 	.ic_attach_hook = lemote_isa_attach_hook,
    165 	.ic_intr_establish = lemote_isa_intr_establish,
    166 	.ic_intr_disestablish = lemote_isa_intr_disestablish,
    167 	.ic_intr_evcnt = lemote_isa_intr_evcnt,
    168 	.ic_intr_string = lemote_isa_intr_string,
    169 };
    170 
    171 const struct platform fuloong_platform = {
    172 	.system_type = LOONGSON_FULOONG,
    173 	.vendor = "Lemote",
    174 	.product = "Fuloong",
    175 
    176 	.bonito_config = &lemote_bonito,
    177 	.isa_chipset = &lemote_isa_chipset,
    178 	.legacy_io_ranges = fuloong_legacy_ranges,
    179 	.bonito_mips_intr = MIPS_INT_MASK_4,
    180 	.isa_mips_intr = MIPS_INT_MASK_0,
    181 	.isa_intr = lemote_isa_intr,
    182 	.p_pci_intr_map = lemote_intr_map,
    183 	.irq_map =loongson2f_irqmap,
    184 
    185 	.setup = fuloong_setup,
    186 	.device_register = lemote_device_register,
    187 
    188 	.powerdown = fuloong_powerdown,
    189 	.reset = lemote_reset
    190 };
    191 
    192 const struct platform lynloong_platform = {
    193 	.system_type = LOONGSON_LYNLOONG,
    194 	.vendor = "Lemote",
    195 	.product = "Lynloong",
    196 
    197 	.bonito_config = &lemote_bonito,
    198 	.isa_chipset = &lemote_isa_chipset,
    199 	.legacy_io_ranges = lynloong_legacy_ranges,
    200 	.bonito_mips_intr = MIPS_INT_MASK_4,
    201 	.isa_mips_intr = MIPS_INT_MASK_0,
    202 	.isa_intr = lemote_isa_intr,
    203 	.p_pci_intr_map = lemote_intr_map,
    204 	.irq_map =loongson2f_irqmap,
    205 
    206 	.setup = fuloong_setup,
    207 	.device_register = lemote_device_register,
    208 
    209 	.powerdown = fuloong_powerdown,
    210 	.reset = lemote_reset
    211 };
    212 
    213 const struct platform yeeloong_platform = {
    214 	.system_type = LOONGSON_YEELOONG,
    215 	.vendor = "Lemote",
    216 	.product = "Yeeloong",
    217 
    218 	.bonito_config = &lemote_bonito,
    219 	.isa_chipset = &lemote_isa_chipset,
    220 	.legacy_io_ranges = yeeloong_legacy_ranges,
    221 	.bonito_mips_intr = MIPS_INT_MASK_4,
    222 	.isa_mips_intr = MIPS_INT_MASK_0,
    223 	.isa_intr = lemote_isa_intr,
    224 	.p_pci_intr_map = lemote_intr_map,
    225 	.irq_map =loongson2f_irqmap,
    226 
    227 	.setup = NULL,
    228 	.device_register = lemote_device_register,
    229 
    230 	.powerdown = yeeloong_powerdown,
    231 	.reset = lemote_reset,
    232 #if NYKBEC > 0
    233 	.suspend = ykbec_suspend,
    234 	.resume = ykbec_resume
    235 #endif
    236 };
    237 
    238 #if NISA > 0
    239 static int stray_intr[BONITO_NISA];
    240 #endif
    241 /*
    242  * PCI model specific routines
    243  */
    244 
    245 void
    246 lemote_pci_attach_hook(device_t parent, device_t self,
    247     struct pcibus_attach_args *pba)
    248 {
    249 	pci_chipset_tag_t pc = pba->pba_pc;
    250 	pcitag_t tag;
    251 	pcireg_t id;
    252 	int dev, i;
    253 
    254 	if (pba->pba_bus != 0)
    255 		return;
    256 
    257 	/*
    258 	 * Check for an AMD CS5536 chip; if one is found, register
    259 	 * the proper PCI configuration space hooks.
    260 	 */
    261 
    262 	for (dev = pci_bus_maxdevs(pc, 0); dev >= 0; dev--) {
    263 		tag = pci_make_tag(pc, 0, dev, 0);
    264 		id = pci_conf_read(pc, tag, PCI_ID_REG);
    265 		DPRINTF(("lemote_pci_attach_hook id 0x%x\n", id));
    266 		if (id == PCI_ID_CODE(PCI_VENDOR_AMD,
    267 		    PCI_PRODUCT_AMD_CS5536_PCISB)) {
    268 			glx_init(pc, tag, dev);
    269 			break;
    270 		}
    271 	}
    272 
    273 	wrmsr(GCSC_PIC_SHDW, 0);
    274 	DPRINTF(("PMON setup picregs:"));
    275 	for (i = 0; i < 12; i++) {
    276 		if (i == 6)
    277 			DPRINTF((" | "));
    278 		DPRINTF((" 0x%x", (uint32_t)(rdmsr(GCSC_PIC_SHDW) & 0xff)));
    279 	}
    280 	DPRINTF(("\n"));
    281 	DPRINTF(("intsel 0x%x 0x%x\n", REGVAL8(BONITO_PCIIO_BASE + 0x4d0),
    282 	    REGVAL8(BONITO_PCIIO_BASE + 0x4d1)));
    283 
    284 	/* setup legacy interrupt controller */
    285 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_OCW1) = 0xff;
    286 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_ICW1) =
    287 	    ICW1_SELECT | ICW1_IC4;
    288 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_ICW2) = ICW2_VECTOR(0);
    289 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_ICW3) = ICW3_CASCADE(2);
    290 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_ICW4) = ICW4_8086;
    291 	delay(100);
    292 	/* mask all interrupts */
    293 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_OCW1) = 0xff;
    294 
    295 	/* read ISR by default. */
    296 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_OCW3) = OCW3_SELECT | OCW3_RR;
    297 	(void)REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_OCW3);
    298 
    299 	/* reset; program device, four bytes */
    300 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_OCW1) = 0xff;
    301 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_ICW1) =
    302 	    ICW1_SELECT | ICW1_IC4;
    303 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_ICW2) = ICW2_VECTOR(8);
    304 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_ICW3) = ICW3_SIC(2);
    305 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_ICW4) = ICW4_8086;
    306 	delay(100);
    307 	/* leave interrupts masked */
    308 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_OCW1) = 0xff;
    309 	/* read ISR by default. */
    310 	REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_OCW3) = OCW3_SELECT | OCW3_RR;
    311 	(void)REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_OCW3);
    312 }
    313 
    314 int
    315 lemote_intr_map(int dev, int fn, int pin, pci_intr_handle_t *ihp)
    316 {
    317 	switch (dev) {
    318 	/* onboard devices, only pin A is wired */
    319 	case 6:
    320 	case 7:
    321 	case 8:
    322 	case 9:
    323 		if (pin == PCI_INTERRUPT_PIN_A) {
    324 			*ihp = BONITO_DIRECT_IRQ(LOONGSON_INTR_PCIA +
    325 			    (dev - 6));
    326 			return (0);
    327 		}
    328 		break;
    329 	/* PCI slot */
    330 	case 10:
    331 		*ihp = BONITO_DIRECT_IRQ(LOONGSON_INTR_PCIA +
    332 		    (pin - PCI_INTERRUPT_PIN_A));
    333 		return (0);
    334 	/* Geode chip */
    335 	case 14:
    336 		switch (fn) {
    337 		case 1:	/* Flash */
    338 			*ihp = BONITO_ISA_IRQ(6);
    339 			return (0);
    340 		case 3:	/* AC97 */
    341 			*ihp = BONITO_ISA_IRQ(9);
    342 			return (0);
    343 		case 4:	/* OHCI */
    344 		case 5:	/* EHCI */
    345 			*ihp = BONITO_ISA_IRQ(11);
    346 			return (0);
    347 		}
    348 		break;
    349 	default:
    350 		break;
    351 	}
    352 	return (1);
    353 }
    354 
    355 /*
    356  * ISA model specific routines
    357  */
    358 #if NISA > 0
    359 void
    360 lemote_isa_attach_hook(device_t parent, device_t self,
    361     struct isabus_attach_args *iba)
    362 {
    363 
    364 	loongson_set_isa_imr(loongson_isaimr);
    365 }
    366 
    367 void *
    368 lemote_isa_intr_establish(void *v, int irq, int type, int level,
    369     int (*handler)(void *), void *arg)
    370 {
    371 	void *ih;
    372 	uint imr;
    373 
    374 	ih =  evbmips_intr_establish(BONITO_ISA_IRQ(irq), handler, arg);
    375 	if (ih == NULL)
    376 		return (NULL);
    377 
    378 	/* enable interrupt */
    379 	imr = lemote_get_isa_imr();
    380 	imr |= (1 << irq);
    381 	DPRINTF(("lemote_isa_intr_establish: enable irq %d 0x%x\n", irq, imr));
    382 	loongson_set_isa_imr(imr);
    383 	return (ih);
    384 }
    385 
    386 void
    387 lemote_isa_intr_disestablish(void *v, void *ih)
    388 {
    389 
    390 	evbmips_intr_disestablish(ih);
    391 }
    392 
    393 const struct evcnt *
    394 lemote_isa_intr_evcnt(void *v, int irq)
    395 {
    396 
    397         if (irq == 0 || irq >= BONITO_NISA || irq == 2)
    398 		panic("lemote_isa_intr_evcnt: bogus isa irq 0x%x", irq);
    399 
    400 	return (&bonito_intrhead[BONITO_ISA_IRQ(irq)].intr_count);
    401 }
    402 
    403 const char *
    404 lemote_isa_intr_string(void *v, int irq, char *buf, size_t len)
    405 {
    406 	if (irq == 0 || irq >= BONITO_NISA || irq == 2)
    407 		panic("lemote_isa_intr_string: bogus isa irq 0x%x", irq);
    408 
    409 	return loongson_intr_string(&lemote_bonito, BONITO_ISA_IRQ(irq), buf,
    410 	    len);
    411 }
    412 #endif
    413 /*
    414  * Legacy (ISA) interrupt handling
    415  */
    416 
    417 /*
    418  * Process legacy interrupts.
    419  *
    420  * XXX On 2F, ISA interrupts only occur on LOONGSON_INTR_INT0, but since
    421  * XXX the other LOONGSON_INTR_INT# are unmaskable, bad things will happen
    422  * XXX if they ever are triggered...
    423  */
    424 void
    425 lemote_isa_intr(int ipl, vaddr_t pc, uint32_t ipending)
    426 {
    427 #if NISA > 0
    428 	struct evbmips_intrhand *ih;
    429 	uint32_t isr, imr, mask;
    430 	int bitno;
    431 	int rc;
    432 
    433 	imr = lemote_get_isa_imr();
    434 	isr = lemote_get_isa_isr() & imr;
    435 	if (isr == 0)
    436 		return;
    437 
    438 	/*
    439 	 * Now process allowed interrupts.
    440 	 */
    441 	/* Service higher level interrupts first */
    442 	for (bitno = BONITO_NISA - 1, mask = 1UL << bitno;
    443 	     mask != 0;
    444 	     bitno--, mask >>= 1) {
    445 		if ((isr & mask) == 0)
    446 			continue;
    447 
    448 		loongson_isa_specific_eoi(bitno);
    449 
    450 		rc = 0;
    451 		LIST_FOREACH(ih,
    452 		    &bonito_intrhead[BONITO_ISA_IRQ(bitno)].intrhand_head,
    453 		    ih_q) {
    454 			if ((*ih->ih_func)(ih->ih_arg) != 0) {
    455 				rc = 1;
    456 				bonito_intrhead[BONITO_ISA_IRQ(bitno)].intr_count.ev_count++;
    457 			}
    458 		}
    459 		if (rc == 0) {
    460 			if (stray_intr[bitno]++ & 0x10000) {
    461 				printf("spurious isa interrupt %d\n", bitno);
    462 				stray_intr[bitno] = 0;
    463 			}
    464 		}
    465 
    466 		if ((isr ^= mask) == 0)
    467 			break;
    468 	}
    469 
    470 	/*
    471 	 * Reenable interrupts which have been serviced.
    472 	 */
    473 	loongson_set_isa_imr(imr);
    474 #endif
    475 }
    476 
    477 uint
    478 lemote_get_isa_imr(void)
    479 {
    480 	uint imr1, imr2;
    481 
    482 	imr1 = 0xff & ~REGVAL8(BONITO_PCIIO_BASE + IO_ICU1 + PIC_OCW1);
    483 	imr1 &= ~(1 << 2);	/* hide cascade */
    484 	imr2 = 0xff & ~REGVAL8(BONITO_PCIIO_BASE + IO_ICU2 + PIC_OCW1);
    485 
    486 	return ((imr2 << 8) | imr1);
    487 }
    488 
    489 uint
    490 lemote_get_isa_isr(void)
    491 {
    492 	uint isr1, isr2;
    493 
    494 	isr1 = REGVAL8(BONITO_PCIIO_BASE + IO_ICU1);
    495 	isr1 &= ~(1 << 2);
    496 	isr2 = REGVAL8(BONITO_PCIIO_BASE + IO_ICU2);
    497 
    498 	return ((isr2 << 8) | isr1);
    499 }
    500 
    501 /*
    502  * Other model specific routines
    503  */
    504 
    505 void
    506 fuloong_powerdown(void)
    507 {
    508 	vaddr_t gpiobase;
    509 
    510 	gpiobase = BONITO_PCIIO_BASE + (rdmsr(GCSC_DIVIL_LBAR_GPIO) & 0xff00);
    511 	/* enable GPIO 13 */
    512 	REGVAL(gpiobase + GCSC_GPIOL_OUT_EN) = GCSC_GPIO_ATOMIC_VALUE(13, 1);
    513 	/* set GPIO13 value to zero */
    514 	REGVAL(gpiobase + GCSC_GPIOL_OUT_VAL) = GCSC_GPIO_ATOMIC_VALUE(13, 0);
    515 }
    516 
    517 void
    518 yeeloong_powerdown(void)
    519 {
    520 
    521 	REGVAL(BONITO_GPIODATA) &= ~0x00000001;
    522 	REGVAL(BONITO_GPIOIE) &= ~0x00000001;
    523 }
    524 
    525 void
    526 lemote_reset(void)
    527 {
    528 
    529 	wrmsr(GCSC_GLCP_SYS_RST, rdmsr(GCSC_GLCP_SYS_RST) | 1);
    530 }
    531 
    532 void
    533 fuloong_setup(void)
    534 {
    535 #if NCOM > 0
    536 	const char *envvar;
    537 	int serial;
    538 
    539 	envvar = pmon_getenv("nokbd");
    540 	serial = envvar != NULL;
    541 	envvar = pmon_getenv("novga");
    542 	serial = serial && envvar != NULL;
    543 
    544 	//serial = 1; /* XXXXXX */
    545 	if (serial) {
    546                 comconsiot = &bonito_iot;
    547                 comconsaddr = 0x2f8;
    548                 comconsrate = 115200; /* default PMON console speed */
    549 	}
    550 #endif
    551 }
    552 
    553 void
    554 lemote_device_register(device_t dev, void *aux)
    555 {
    556 	const char *name = device_xname(dev);
    557 
    558 	if (device_class(dev) != bootdev_class)
    559 		return;
    560 
    561 	/*
    562 	 * The device numbering must match. There's no way
    563 	 * pmon tells us more info. Depending on the usb slot
    564 	 * and hubs used you may be lucky. Also, assume umass/sd for usb
    565 	 * attached devices.
    566 	 */
    567 	switch (bootdev_class) {
    568 	case DV_DISK:
    569 		if (device_is_a(dev, "wd") && strcmp(name, bootdev) == 0) {
    570 			if (booted_device == NULL)
    571 				booted_device = dev;
    572 		} else {
    573 			/* XXX this really only works safely for usb0... */
    574 		    	if ((device_is_a(dev, "sd") ||
    575 			    device_is_a(dev, "cd") == 0) &&
    576 			    strncmp(bootdev, "usb", 3) == 0 &&
    577 			    strcmp(name + 2, bootdev + 3) == 0) {
    578 				if (booted_device == NULL)
    579 					booted_device = dev;
    580 			}
    581 		}
    582 		break;
    583 	case DV_IFNET:
    584 		/*
    585 		 * This relies on the onboard Ethernet interface being
    586 		 * attached before any other (usb) interface.
    587 		 */
    588 		if (booted_device == NULL)
    589 			booted_device = dev;
    590 		break;
    591 	default:
    592 		break;
    593 	}
    594 }
    595