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#include "string.h"
#include "io.h"
#include "timer.h"
#include "console.h"
#include "eisa.h"
/*
* Increment a bus_loc structure to the next possible EISA location.
* Leave the structure zeroed and return 0 if there are no more valid
* locations.
*
*/
static int eisa_next_location ( struct bus_loc *bus_loc ) {
struct eisa_loc *eisa_loc = ( struct eisa_loc * ) bus_loc;
/*
* Ensure that there is sufficient space in the shared bus
* structures for a struct isa_loc and a struct
* isa_dev, as mandated by bus.h.
*
*/
BUS_LOC_CHECK ( struct eisa_loc );
BUS_DEV_CHECK ( struct eisa_device );
return ( eisa_loc->slot = ( ++eisa_loc->slot & EISA_MAX_SLOT ) );
}
/*
* Fill in parameters for an EISA device based on slot number
*
* Return 1 if device present, 0 otherwise
*
*/
static int eisa_fill_device ( struct bus_dev *bus_dev,
struct bus_loc *bus_loc ) {
struct eisa_loc *eisa_loc = ( struct eisa_loc * ) bus_loc;
struct eisa_device *eisa = ( struct eisa_device * ) bus_dev;
uint8_t present;
/* Copy slot number to struct eisa, set default values */
eisa->slot = eisa_loc->slot;
eisa->name = "?";
/* Slot 0 is never valid */
if ( ! eisa->slot )
return 0;
/* Set ioaddr */
eisa->ioaddr = EISA_SLOT_BASE ( eisa->slot );
/* Test for board present */
outb ( 0xff, eisa->ioaddr + EISA_MFG_ID_HI );
present = inb ( eisa->ioaddr + EISA_MFG_ID_HI );
if ( present & 0x80 ) {
/* No board present */
return 0;
}
/* Read mfg and product IDs. Yes, the resulting uint16_ts
* will be upside-down. This appears to be by design.
*/
eisa->mfg_id = ( inb ( eisa->ioaddr + EISA_MFG_ID_LO ) << 8 )
+ present;
eisa->prod_id = ( inb ( eisa->ioaddr + EISA_PROD_ID_LO ) << 8 )
+ inb ( eisa->ioaddr + EISA_PROD_ID_HI );
DBG ( "EISA found slot %hhx (base %#hx) ID %hx:%hx (\"%s\")\n",
eisa->slot, eisa->ioaddr, eisa->mfg_id, eisa->prod_id,
isa_id_string ( eisa->mfg_id, eisa->prod_id ) );
return 1;
}
/*
* Test whether or not a driver is capable of driving the device.
*
*/
static int eisa_check_driver ( struct bus_dev *bus_dev,
struct device_driver *device_driver ) {
struct eisa_device *eisa = ( struct eisa_device * ) bus_dev;
struct eisa_driver *driver
= ( struct eisa_driver * ) device_driver->bus_driver_info;
unsigned int i;
/* Compare against driver's ID list */
for ( i = 0 ; i < driver->id_count ; i++ ) {
struct eisa_id *id = &driver->ids[i];
if ( ( eisa->mfg_id == id->mfg_id ) &&
( ISA_PROD_ID ( eisa->prod_id ) ==
ISA_PROD_ID ( id->prod_id ) ) ) {
DBG ( "EISA found ID %hx:%hx (\"%s\") "
"(device %s) matching driver %s\n",
eisa->mfg_id, eisa->prod_id,
isa_id_string ( eisa->mfg_id,
eisa->prod_id ),
id->name, driver->name );
eisa->name = id->name;
return 1;
}
}
/* No device found */
return 0;
}
/*
* Describe an EISA device
*
*/
static char * eisa_describe_device ( struct bus_dev *bus_dev ) {
struct eisa_device *eisa = ( struct eisa_device * ) bus_dev;
static char eisa_description[] = "EISA 00";
sprintf ( eisa_description + 5, "%hhx", eisa->slot );
return eisa_description;
}
/*
* Name an EISA device
*
*/
static const char * eisa_name_device ( struct bus_dev *bus_dev ) {
struct eisa_device *eisa = ( struct eisa_device * ) bus_dev;
return eisa->name;
}
/*
* EISA bus operations table
*
*/
struct bus_driver eisa_driver __bus_driver = {
.name = "EISA",
.next_location = eisa_next_location,
.fill_device = eisa_fill_device,
.check_driver = eisa_check_driver,
.describe_device = eisa_describe_device,
.name_device = eisa_name_device,
};
/*
* Fill in a nic structure
*
*/
void eisa_fill_nic ( struct nic *nic, struct eisa_device *eisa ) {
/* Fill in ioaddr and irqno */
nic->ioaddr = eisa->ioaddr;
nic->irqno = 0;
/* Fill in DHCP device ID structure */
nic->dhcp_dev_id.bus_type = ISA_BUS_TYPE;
nic->dhcp_dev_id.vendor_id = htons ( eisa->mfg_id );
nic->dhcp_dev_id.device_id = htons ( eisa->prod_id );
}
/*
* Reset and enable/disable an EISA device
*
*/
void eisa_device_enabled ( struct eisa_device *eisa, int enabled ) {
/* Set reset line high for 1000 µs. Spec says 500 µs, but
* this doesn't work for all cards, so we are conservative.
*/
outb ( EISA_CMD_RESET, eisa->ioaddr + EISA_GLOBAL_CONFIG );
udelay ( 1000 ); /* Must wait 800 */
/* Set reset low and write a 1 to ENABLE. Delay again, in
* case the card takes a while to wake up.
*/
outb ( enabled ? EISA_CMD_ENABLE : 0,
eisa->ioaddr + EISA_GLOBAL_CONFIG );
udelay ( 1000 ); /* Must wait 800 */
DBG ( "EISA %s device %hhx\n", ( enabled ? "enabled" : "disabled" ),
eisa->slot );
}
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