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freebsd-dev/sys/isa/pnp.c

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/*
* Copyright (c) 1996, Sujal M. Patel
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: pnp.c,v 1.11 1999/05/06 22:11:19 peter Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <isa/isavar.h>
#include <isa/pnpreg.h>
#include <isa/pnpvar.h>
#include <machine/bus.h>
typedef struct _pnp_id {
uint32_t vendor_id;
uint32_t serial;
u_char checksum;
} pnp_id;
struct pnp_set_config_arg {
int csn; /* Card number to configure */
int ldn; /* Logical device on card */
};
struct pnp_quirk {
uint32_t vendor_id; /* Vendor of the card */
uint32_t logical_id; /* ID of the device with quirk */
int type;
#define PNP_QUIRK_WRITE_REG 1 /* Need to write a pnp register */
#define PNP_QUIRK_EXTRA_IO 2 /* Has extra io ports */
int arg1;
int arg2;
};
struct pnp_quirk pnp_quirks[] = {
/*
* The Gravis UltraSound needs register 0xf2 to be set to 0xff
* to enable power.
* XXX need to know the logical device id.
*/
{ 0x0100561e /* GRV0001 */, 0,
PNP_QUIRK_WRITE_REG, 0xf2, 0xff },
/*
* An emu8000 does not give us other than the first
* port.
*/
{ 0x26008c0e /* SB16 */, 0x21008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0x42008c0e /* SB32(CTL0042) */, 0x21008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0x44008c0e /* SB32(CTL0044) */, 0x21008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0x49008c0e /* SB32(CTL0049) */, 0x21008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0xf1008c0e /* SB32(CTL00f1) */, 0x21008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0xc1008c0e /* SB64(CTL00c1) */, 0x22008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0xc5008c0e /* SB64(CTL00c5) */, 0x22008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0xe4008c0e /* SB64(CTL00e4) */, 0x22008c0e,
PNP_QUIRK_EXTRA_IO, 0x400, 0x800 },
{ 0 }
};
#ifdef PC98
/* Some NEC PnP cards have 9 bytes serial code. */
static pnp_id necids[] = {
{0x4180a3b8, 0xffffffff, 0x00}, /* PC-9801CB-B04 (NEC8041) */
{0x5181a3b8, 0xffffffff, 0x46}, /* PC-9821CB2-B04(NEC8151) */
{0x5182a3b8, 0xffffffff, 0xb8}, /* PC-9801-XX (NEC8251) */
{0x9181a3b8, 0xffffffff, 0x00}, /* PC-9801-120 (NEC8191) */
{0, 0, 0}
};
#endif
/* The READ_DATA port that we are using currently */
static int pnp_rd_port;
static void pnp_send_initiation_key(void);
static int pnp_get_serial(pnp_id *p);
static int pnp_isolation_protocol(device_t parent);
char *
pnp_eisaformat(uint32_t id)
{
uint8_t *data = (uint8_t *) &id;
static char idbuf[8];
const char hextoascii[] = "0123456789abcdef";
idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
idbuf[2] = '@' + (data[1] & 0x1f);
idbuf[3] = hextoascii[(data[2] >> 4)];
idbuf[4] = hextoascii[(data[2] & 0xf)];
idbuf[5] = hextoascii[(data[3] >> 4)];
idbuf[6] = hextoascii[(data[3] & 0xf)];
idbuf[7] = 0;
return(idbuf);
}
static void
pnp_write(int d, u_char r)
{
outb (_PNP_ADDRESS, d);
outb (_PNP_WRITE_DATA, r);
}
/*
* Send Initiation LFSR as described in "Plug and Play ISA Specification",
* Intel May 94.
*/
static void
pnp_send_initiation_key()
{
int cur, i;
/* Reset the LSFR */
outb(_PNP_ADDRESS, 0);
outb(_PNP_ADDRESS, 0); /* yes, we do need it twice! */
cur = 0x6a;
outb(_PNP_ADDRESS, cur);
for (i = 1; i < 32; i++) {
cur = (cur >> 1) | (((cur ^ (cur >> 1)) << 7) & 0xff);
outb(_PNP_ADDRESS, cur);
}
}
/*
* Get the device's serial number. Returns 1 if the serial is valid.
*/
static int
pnp_get_serial(pnp_id *p)
{
int i, bit, valid = 0, sum = 0x6a;
u_char *data = (u_char *)p;
bzero(data, sizeof(char) * 9);
outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
for (i = 0; i < 72; i++) {
bit = inb((pnp_rd_port << 2) | 0x3) == 0x55;
DELAY(250); /* Delay 250 usec */
/* Can't Short Circuit the next evaluation, so 'and' is last */
bit = (inb((pnp_rd_port << 2) | 0x3) == 0xaa) && bit;
DELAY(250); /* Delay 250 usec */
valid = valid || bit;
if (i < 64)
sum = (sum >> 1) |
(((sum ^ (sum >> 1) ^ bit) << 7) & 0xff);
data[i / 8] = (data[i / 8] >> 1) | (bit ? 0x80 : 0);
}
valid = valid && (data[8] == sum);
return (valid);
}
/*
* Fill's the buffer with resource info from the device.
* Returns the number of characters read.
*/
static int
pnp_get_resource_info(u_char *buffer, int len)
{
int i, j, count;
u_char temp;
count = 0;
for (i = 0; i < len; i++) {
outb(_PNP_ADDRESS, PNP_STATUS);
for (j = 0; j < 100; j++) {
if ((inb((pnp_rd_port << 2) | 0x3)) & 0x1)
break;
DELAY(1);
}
if (j == 100) {
printf("PnP device failed to report resource data\n");
return (count);
}
outb(_PNP_ADDRESS, PNP_RESOURCE_DATA);
temp = inb((pnp_rd_port << 2) | 0x3);
if (buffer != NULL)
buffer[i] = temp;
count++;
}
return (count);
}
/*
* This function is called after the bus has assigned resource
* locations for a logical device.
*/
static void
pnp_set_config(void *arg, struct isa_config *config, int enable)
{
int csn = ((struct pnp_set_config_arg *) arg)->csn;
int ldn = ((struct pnp_set_config_arg *) arg)->ldn;
int i;
/*
* First put all cards into Sleep state with the initiation
* key, then put our card into Config state.
*/
pnp_send_initiation_key();
pnp_write(PNP_WAKE, csn);
/*
* Select our logical device so that we can program it.
*/
pnp_write(PNP_SET_LDN, ldn);
/*
* Constrain the number of resources we will try to program
*/
if (config->ic_nmem > ISA_PNP_NMEM) {
printf("too many ISA memory ranges (%d > %d)\n",
config->ic_nmem, ISA_PNP_NMEM);
config->ic_nmem = ISA_PNP_NMEM;
}
if (config->ic_nport > ISA_PNP_NPORT) {
printf("too many ISA I/O ranges (%d > %d)\n", config->ic_nport,
ISA_PNP_NPORT);
config->ic_nport = ISA_PNP_NPORT;
}
if (config->ic_nirq > ISA_PNP_NIRQ) {
printf("too many ISA IRQs (%d > %d)\n", config->ic_nirq,
ISA_PNP_NIRQ);
config->ic_nirq = ISA_PNP_NIRQ;
}
if (config->ic_ndrq > ISA_PNP_NDRQ) {
printf("too many ISA DRQs (%d > %d)\n", config->ic_ndrq,
ISA_PNP_NDRQ);
config->ic_ndrq = ISA_PNP_NDRQ;
}
/*
* Now program the resources.
*/
for (i = 0; i < config->ic_nmem; i++) {
uint32_t start;
uint32_t size;
/* XXX: should handle memory control register, 32 bit memory */
if (config->ic_mem[i].ir_size == 0) {
pnp_write(PNP_MEM_BASE_HIGH(i), 0);
pnp_write(PNP_MEM_BASE_LOW(i), 0);
pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
pnp_write(PNP_MEM_RANGE_LOW(i), 0);
} else {
start = config->ic_mem[i].ir_start;
size = config->ic_mem[i].ir_size;
if (start & 0xff)
panic("pnp_set_config: bogus memory assignment");
pnp_write(PNP_MEM_BASE_HIGH(i), (start >> 16) & 0xff);
pnp_write(PNP_MEM_BASE_LOW(i), (start >> 8) & 0xff);
pnp_write(PNP_MEM_RANGE_HIGH(i), (size >> 16) & 0xff);
pnp_write(PNP_MEM_RANGE_LOW(i), (size >> 8) & 0xff);
}
}
for (; i < ISA_PNP_NMEM; i++) {
pnp_write(PNP_MEM_BASE_HIGH(i), 0);
pnp_write(PNP_MEM_BASE_LOW(i), 0);
pnp_write(PNP_MEM_RANGE_HIGH(i), 0);
pnp_write(PNP_MEM_RANGE_LOW(i), 0);
}
for (i = 0; i < config->ic_nport; i++) {
uint32_t start;
if (config->ic_port[i].ir_size == 0) {
pnp_write(PNP_IO_BASE_HIGH(i), 0);
pnp_write(PNP_IO_BASE_LOW(i), 0);
} else {
start = config->ic_port[i].ir_start;
pnp_write(PNP_IO_BASE_HIGH(i), (start >> 8) & 0xff);
pnp_write(PNP_IO_BASE_LOW(i), (start >> 0) & 0xff);
}
}
for (; i < ISA_PNP_NPORT; i++) {
pnp_write(PNP_IO_BASE_HIGH(i), 0);
pnp_write(PNP_IO_BASE_LOW(i), 0);
}
for (i = 0; i < config->ic_nirq; i++) {
int irq;
/* XXX: interrupt type */
if (config->ic_irqmask[i] == 0) {
pnp_write(PNP_IRQ_LEVEL(i), 0);
pnp_write(PNP_IRQ_TYPE(i), 2);
} else {
irq = ffs(config->ic_irqmask[i]) - 1;
pnp_write(PNP_IRQ_LEVEL(i), irq);
pnp_write(PNP_IRQ_TYPE(i), 2); /* XXX */
}
}
for (; i < ISA_PNP_NIRQ; i++) {
/*
* IRQ 0 is not a valid interrupt selection and
* represents no interrupt selection.
*/
pnp_write(PNP_IRQ_LEVEL(i), 0);
pnp_write(PNP_IRQ_TYPE(i), 2);
}
for (i = 0; i < config->ic_ndrq; i++) {
int drq;
if (config->ic_drqmask[i] == 0) {
pnp_write(PNP_DMA_CHANNEL(i), 4);
} else {
drq = ffs(config->ic_drqmask[i]) - 1;
pnp_write(PNP_DMA_CHANNEL(i), drq);
}
}
for (; i < ISA_PNP_NDRQ; i++) {
/*
* DMA channel 4, the cascade channel is used to
* indicate no DMA channel is active.
*/
pnp_write(PNP_DMA_CHANNEL(i), 4);
}
pnp_write(PNP_ACTIVATE, enable ? 1 : 0);
/*
* Wake everyone up again, we are finished.
*/
pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
}
/*
* Process quirks for a logical device.. The card must be in Config state.
*/
void
pnp_check_quirks(uint32_t vendor_id, uint32_t logical_id, int ldn,
struct isa_config *config)
{
struct pnp_quirk *qp;
for (qp = &pnp_quirks[0]; qp->vendor_id; qp++) {
if (qp->vendor_id == vendor_id
&& (qp->logical_id == 0 || qp->logical_id == logical_id)) {
switch (qp->type) {
case PNP_QUIRK_WRITE_REG:
pnp_write(PNP_SET_LDN, ldn);
pnp_write(qp->arg1, qp->arg2);
break;
case PNP_QUIRK_EXTRA_IO:
if (config == NULL)
break;
if (qp->arg1 != 0) {
config->ic_nport++;
config->ic_port[config->ic_nport - 1] = config->ic_port[0];
config->ic_port[config->ic_nport - 1].ir_start += qp->arg1;
config->ic_port[config->ic_nport - 1].ir_end += qp->arg1;
}
if (qp->arg2 != 0) {
config->ic_nport++;
config->ic_port[config->ic_nport - 1] = config->ic_port[0];
config->ic_port[config->ic_nport - 1].ir_start += qp->arg2;
config->ic_port[config->ic_nport - 1].ir_end += qp->arg2;
}
break;
}
}
}
}
/*
* Scan Resource Data for Logical Devices.
*
* This function exits as soon as it gets an error reading *ANY*
* Resource Data or it reaches the end of Resource Data. In the first
* case the return value will be TRUE, FALSE otherwise.
*/
static int
pnp_create_devices(device_t parent, pnp_id *p, int csn,
u_char *resources, int len)
{
u_char tag, *resp, *resinfo, *startres = 0;
int large_len, scanning = len, retval = FALSE;
uint32_t logical_id;
device_t dev = 0;
int ldn = 0;
struct pnp_set_config_arg *csnldn;
char buf[100];
char *desc = 0;
resp = resources;
while (scanning > 0) {
tag = *resp++;
scanning--;
if (PNP_RES_TYPE(tag) != 0) {
/* Large resource */
if (scanning < 2) {
scanning = 0;
continue;
}
large_len = resp[0] + (resp[1] << 8);
resp += 2;
if (scanning < large_len) {
scanning = 0;
continue;
}
resinfo = resp;
resp += large_len;
scanning -= large_len;
if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
if (dev) {
/*
* This is an optional device
* indentifier string. Skipt it
* for now.
*/
continue;
}
/* else mandately card identifier string */
if (large_len > sizeof(buf) - 1)
large_len = sizeof(buf) - 1;
bcopy(resinfo, buf, large_len);
/*
* Trim trailing spaces.
*/
while (buf[large_len-1] == ' ')
large_len--;
buf[large_len] = '\0';
desc = buf;
continue;
}
continue;
}
/* Small resource */
if (scanning < PNP_SRES_LEN(tag)) {
scanning = 0;
continue;
}
resinfo = resp;
resp += PNP_SRES_LEN(tag);
scanning -= PNP_SRES_LEN(tag);;
switch (PNP_SRES_NUM(tag)) {
case PNP_TAG_LOGICAL_DEVICE:
/*
* Parse the resources for the previous
* logical device (if any).
*/
if (startres) {
pnp_parse_resources(dev, startres,
resinfo - startres - 1, ldn);
dev = 0;
startres = 0;
}
/*
* A new logical device. Scan for end of
* resources.
*/
bcopy(resinfo, &logical_id, 4);
pnp_check_quirks(p->vendor_id, logical_id, ldn, NULL);
dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
if (desc)
device_set_desc_copy(dev, desc);
else
device_set_desc_copy(dev,
pnp_eisaformat(logical_id));
isa_set_vendorid(dev, p->vendor_id);
isa_set_serial(dev, p->serial);
isa_set_logicalid(dev, logical_id);
isa_set_configattr(dev,
ISACFGATTR_CANDISABLE | ISACFGATTR_DYNAMIC);
csnldn = malloc(sizeof *csnldn, M_DEVBUF, M_NOWAIT);
if (!csnldn) {
device_printf(parent, "out of memory\n");
scanning = 0;
break;
}
csnldn->csn = csn;
csnldn->ldn = ldn;
ISA_SET_CONFIG_CALLBACK(parent, dev, pnp_set_config,
csnldn);
ldn++;
startres = resp;
break;
case PNP_TAG_END:
if (!startres) {
device_printf(parent, "malformed resources\n");
scanning = 0;
break;
}
pnp_parse_resources(dev, startres,
resinfo - startres - 1, ldn);
dev = 0;
startres = 0;
scanning = 0;
break;
default:
/* Skip this resource */
break;
}
}
return (retval);
}
/*
* Read 'amount' bytes of resources from the card, allocating memory
* as needed. If a buffer is already available, it should be passed in
* '*resourcesp' and its length in '*spacep'. The number of resource
* bytes already in the buffer should be passed in '*lenp'. The memory
* allocated will be returned in '*resourcesp' with its size and the
* number of bytes of resources in '*spacep' and '*lenp' respectively.
*
* XXX: Multiple problems here, we forget to free() stuff in one
* XXX: error return, and in another case we free (*resourcesp) but
* XXX: don't tell the caller.
*/
static int
pnp_read_bytes(int amount, u_char **resourcesp, int *spacep, int *lenp)
{
u_char *resources = *resourcesp;
u_char *newres;
int space = *spacep;
int len = *lenp;
if (space == 0) {
space = 1024;
resources = malloc(space, M_TEMP, M_NOWAIT);
if (!resources)
return (ENOMEM);
}
if (len + amount > space) {
int extra = 1024;
while (len + amount > space + extra)
extra += 1024;
newres = malloc(space + extra, M_TEMP, M_NOWAIT);
if (!newres) {
/* XXX: free resources */
return (ENOMEM);
}
bcopy(resources, newres, len);
free(resources, M_TEMP);
resources = newres;
space += extra;
}
if (pnp_get_resource_info(resources + len, amount) != amount)
return (EINVAL);
len += amount;
*resourcesp = resources;
*spacep = space;
*lenp = len;
return (0);
}
/*
* Read all resources from the card, allocating memory as needed. If a
* buffer is already available, it should be passed in '*resourcesp'
* and its length in '*spacep'. The memory allocated will be returned
* in '*resourcesp' with its size and the number of bytes of resources
* in '*spacep' and '*lenp' respectively.
*/
static int
pnp_read_resources(u_char **resourcesp, int *spacep, int *lenp)
{
u_char *resources = *resourcesp;
int space = *spacep;
int len = 0;
int error, done;
u_char tag;
error = 0;
done = 0;
while (!done) {
error = pnp_read_bytes(1, &resources, &space, &len);
if (error)
goto out;
tag = resources[len-1];
if (PNP_RES_TYPE(tag) == 0) {
/*
* Small resource, read contents.
*/
error = pnp_read_bytes(PNP_SRES_LEN(tag),
&resources, &space, &len);
if (error)
goto out;
if (PNP_SRES_NUM(tag) == PNP_TAG_END)
done = 1;
} else {
/*
* Large resource, read length and contents.
*/
error = pnp_read_bytes(2, &resources, &space, &len);
if (error)
goto out;
error = pnp_read_bytes(resources[len-2]
+ (resources[len-1] << 8), &resources, &space,
&len);
if (error)
goto out;
}
}
out:
*resourcesp = resources;
*spacep = space;
*lenp = len;
return (error);
}
/*
* Run the isolation protocol. Use pnp_rd_port as the READ_DATA port
* value (caller should try multiple READ_DATA locations before giving
* up). Upon exiting, all cards are aware that they should use
* pnp_rd_port as the READ_DATA port.
*
* In the first pass, a csn is assigned to each board and pnp_id's
* are saved to an array, pnp_devices. In the second pass, each
* card is woken up and the device configuration is called.
*/
static int
pnp_isolation_protocol(device_t parent)
{
int csn;
pnp_id id;
int found = 0, len;
u_char *resources = 0;
int space = 0;
int error;
#ifdef PC98
int n, necpnp;
u_char buffer[10];
#endif
/*
* Put all cards into the Sleep state so that we can clear
* their CSNs.
*/
pnp_send_initiation_key();
/*
* Clear the CSN for all cards.
*/
pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_RESET_CSN);
/*
* Move all cards to the Isolation state.
*/
pnp_write(PNP_WAKE, 0);
/*
* Tell them where the read point is going to be this time.
*/
pnp_write(PNP_SET_RD_DATA, pnp_rd_port);
for (csn = 1; csn < PNP_MAX_CARDS; csn++) {
/*
* Start the serial isolation protocol.
*/
outb(_PNP_ADDRESS, PNP_SERIAL_ISOLATION);
DELAY(1000); /* Delay 1 msec */
if (pnp_get_serial(&id)) {
/*
* We have read the id from a card
* successfully. The card which won the
* isolation protocol will be in Isolation
* mode and all others will be in Sleep.
* Program the CSN of the isolated card
* (taking it to Config state) and read its
* resources, creating devices as we find
* logical devices on the card.
*/
pnp_write(PNP_SET_CSN, csn);
#ifdef PC98
if (bootverbose)
printf("PnP Vendor ID = %x\n", id.vendor_id);
/* Check for NEC PnP (9 bytes serial). */
for (n = necpnp = 0; necids[n].vendor_id; n++) {
if (id.vendor_id == necids[n].vendor_id) {
necpnp = 1;
break;
}
}
if (necpnp) {
if (bootverbose)
printf("An NEC-PnP card (%s).\n",
pnp_eisaformat(id.vendor_id));
/* Read dummy 9 bytes serial area. */
pnp_get_resource_info(buffer, 9);
} else {
if (bootverbose)
printf("A Normal-ISA-PnP card (%s).\n",
pnp_eisaformat(id.vendor_id));
}
if (bootverbose)
printf("Reading PnP configuration for %s.\n",
pnp_eisaformat(id.vendor_id));
#endif
error = pnp_read_resources(&resources, &space, &len);
if (error)
break;
pnp_create_devices(parent, &id, csn, resources, len);
found++;
} else
break;
/*
* Put this card back to the Sleep state and
* simultaneously move all cards which don't have a
* CSN yet to Isolation state.
*/
pnp_write(PNP_WAKE, 0);
}
/*
* Unless we have chosen the wrong read port, all cards will
* be in Sleep state. Put them back into WaitForKey for
* now. Their resources will be programmed later.
*/
pnp_write(PNP_CONFIG_CONTROL, PNP_CONFIG_CONTROL_WAIT_FOR_KEY);
/*
* Cleanup.
*/
if (resources)
free(resources, M_TEMP);
return (found);
}
/*
* pnp_identify()
*
* autoconfiguration of pnp devices. This routine just runs the
* isolation protocol over several ports, until one is successful.
*
* may be called more than once ?
*
*/
static void
pnp_identify(driver_t *driver, device_t parent)
{
int num_pnp_devs;
/* Try various READ_DATA ports from 0x203-0x3ff */
for (pnp_rd_port = 0x80; (pnp_rd_port < 0xff); pnp_rd_port += 0x10) {
if (bootverbose)
printf("pnp_identify: Trying Read_Port at %x\n",
(pnp_rd_port << 2) | 0x3);
num_pnp_devs = pnp_isolation_protocol(parent);
if (num_pnp_devs)
break;
}
if (bootverbose)
printf("PNP Identify complete\n");
}
static device_method_t pnp_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, pnp_identify),
{ 0, 0 }
};
static driver_t pnp_driver = {
"pnp",
pnp_methods,
1, /* no softc */
};
static devclass_t pnp_devclass;
DRIVER_MODULE(pnp, isa, pnp_driver, pnp_devclass, 0, 0);
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