eisa.c File Reference

#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ipxe/io.h>
#include <unistd.h>
#include <ipxe/eisa.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER)
static void	eisabus_remove (struct root_device *rootdev)
	Remove EISA root bus. More...
void	eisa_device_enabled (struct eisa_device *eisa, int enabled)
	Reset and enable/disable an EISA device. More...
static int	eisa_probe (struct eisa_device *eisa)
	Probe an EISA device. More...
static void	eisa_remove (struct eisa_device *eisa)
	Remove an EISA device. More...
static int	eisabus_probe (struct root_device *rootdev)
	Probe EISA root bus. More...

Variables
static struct root_driver	eisa_root_driver
	EISA bus root device driver. More...
struct root_device eisa_root_device	__root_device
	EISA bus root device. More...

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER

)

eisabus_remove()

static void eisabus_remove ( struct root_device *  rootdev )

static

Remove EISA root bus.

Parameters

rootdev

EISA bus root device

Definition at line 168 of file eisa.c.

                                                           {
        struct eisa_device *eisa;
        struct eisa_device *tmp;

        list_for_each_entry_safe ( eisa, tmp, &rootdev->dev.children,
                                   dev.siblings ) {
                eisa_remove ( eisa );
                list_del ( &eisa->dev.siblings );
                free ( eisa );
        }
}

References device::children, eisa_device::dev, root_device::dev, eisa_remove(), free, list_del, list_for_each_entry_safe, device::siblings, and tmp.

Referenced by eisabus_probe().

eisa_device_enabled()

void eisa_device_enabled	(	struct eisa_device *	eisa,
		int	enabled
	)

Reset and enable/disable an EISA device.

Parameters

eisa	EISA device
enabled	1=enable, 0=disable

Definition at line 20 of file eisa.c.

                                                                   {
        /* 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 %02x\n", ( enabled ? "enabled" : "disabled" ),
              eisa->slot );
}

References DBG, EISA_CMD_ENABLE, EISA_CMD_RESET, EISA_GLOBAL_CONFIG, enabled, eisa_device::ioaddr, outb, eisa_device::slot, and udelay().

Referenced by disable_eisa_device(), and enable_eisa_device().

eisa_probe()

static int eisa_probe ( struct eisa_device *  eisa )

static

Probe an EISA device.

Parameters

eisa	EISA device

Return values

rc	Return status code

Searches for a driver for the EISA device. If a driver is found, its probe() routine is called.

Definition at line 47 of file eisa.c.

                                                   {
        struct eisa_driver *driver;
        struct eisa_device_id *id;
        unsigned int i;
        int rc;

        DBG ( "Adding EISA device %02x (%04x:%04x (\"%s\") io %x)\n",
              eisa->slot, eisa->vendor_id, eisa->prod_id,
              isa_id_string ( eisa->vendor_id, eisa->prod_id ), eisa->ioaddr );

        for_each_table_entry ( driver, EISA_DRIVERS ) {
                for ( i = 0 ; i < driver->id_count ; i++ ) {
                        id = &driver->ids[i];
                        if ( id->vendor_id != eisa->vendor_id )
                                continue;
                        if ( ISA_PROD_ID ( id->prod_id ) !=
                             ISA_PROD_ID ( eisa->prod_id ) )
                                continue;
                        eisa->driver = driver;
                        eisa->dev.driver_name = id->name;
                        DBG ( "...using driver %s\n", eisa->dev.driver_name );
                        if ( ( rc = driver->probe ( eisa, id ) ) != 0 ) {
                                DBG ( "......probe failed\n" );
                                continue;
                        }
                        return 0;
                }
        }

        DBG ( "...no driver found\n" );
        return -ENOTTY;
}

References DBG, eisa_device::dev, eisa_device::driver, device::driver_name, EISA_DRIVERS, ENOTTY, for_each_table_entry, id, eisa_driver::id_count, eisa_driver::ids, eisa_device::ioaddr, isa_id_string(), ISA_PROD_ID, eisa_driver::probe, eisa_device::prod_id, rc, eisa_device::slot, and eisa_device::vendor_id.

Referenced by eisabus_probe().

eisa_remove()

static void eisa_remove ( struct eisa_device *  eisa )

static

Remove an EISA device.

Parameters

eisa	EISA device

Definition at line 85 of file eisa.c.

                                                     {
        eisa->driver->remove ( eisa );
        DBG ( "Removed EISA device %02x\n", eisa->slot );
}

References DBG, eisa_device::driver, eisa_driver::remove, and eisa_device::slot.

Referenced by eisabus_remove().

eisabus_probe()

static int eisabus_probe ( struct root_device *  rootdev )

static

Probe EISA root bus.

Parameters

rootdev

EISA bus root device

Scans the EISA bus for devices and registers all devices it can find.

Definition at line 98 of file eisa.c.

                                                         {
        struct eisa_device *eisa = NULL;
        unsigned int slot;
        uint8_t system;
        int rc;

        /* Check for EISA system board */
        system = inb ( EISA_VENDOR_ID );
        if ( system & 0x80 ) {
                DBG ( "No EISA system board (read %02x)\n", system );
                return -ENODEV;
        }

        for ( slot = EISA_MIN_SLOT ; slot <= EISA_MAX_SLOT ; slot++ ) {
                /* Allocate struct eisa_device */
                if ( ! eisa )
                        eisa = malloc ( sizeof ( *eisa ) );
                if ( ! eisa ) {
                        rc = -ENOMEM;
                        goto err;
                }
                memset ( eisa, 0, sizeof ( *eisa ) );
                eisa->slot = slot;
                eisa->ioaddr = EISA_SLOT_BASE ( eisa->slot );

                /* Test for board present */
                outb ( 0xff, eisa->ioaddr + EISA_VENDOR_ID );
                eisa->vendor_id =
                        le16_to_cpu ( inw ( eisa->ioaddr + EISA_VENDOR_ID ) );
                eisa->prod_id =
                        le16_to_cpu ( inw ( eisa->ioaddr + EISA_PROD_ID ) );
                if ( eisa->vendor_id & 0x80 ) {
                        /* No board present */
                        continue;
                }

                /* Add to device hierarchy */
                snprintf ( eisa->dev.name, sizeof ( eisa->dev.name ),
                           "EISA%02x", slot );
                eisa->dev.desc.bus_type = BUS_TYPE_EISA;
                eisa->dev.desc.vendor = eisa->vendor_id;
                eisa->dev.desc.device = eisa->prod_id;
                eisa->dev.parent = &rootdev->dev;
                list_add ( &eisa->dev.siblings, &rootdev->dev.children );
                INIT_LIST_HEAD ( &eisa->dev.children );

                /* Look for a driver */
                if ( eisa_probe ( eisa ) == 0 ) {
                        /* eisadev registered, we can drop our ref */
                        eisa = NULL;
                } else {
                        /* Not registered; re-use struct */
                        list_del ( &eisa->dev.siblings );
                }
        }

        free ( eisa );
        return 0;

 err:
        free ( eisa );
        eisabus_remove ( rootdev );
        return rc;
}

References device_description::bus_type, BUS_TYPE_EISA, device::children, DBG, device::desc, eisa_device::dev, root_device::dev, device_description::device, EISA_MAX_SLOT, EISA_MIN_SLOT, eisa_probe(), EISA_PROD_ID, EISA_SLOT_BASE, EISA_VENDOR_ID, eisabus_remove(), ENODEV, ENOMEM, free, inb(), INIT_LIST_HEAD, inw(), eisa_device::ioaddr, le16_to_cpu, list_add, list_del, malloc(), memset(), device::name, NULL, outb, device::parent, eisa_device::prod_id, rc, device::siblings, slot, eisa_device::slot, snprintf(), system, device_description::vendor, and eisa_device::vendor_id.

Variable Documentation

eisa_root_driver

struct root_driver eisa_root_driver

static

Initial value:

= {
        .probe = eisabus_probe,
        .remove = eisabus_remove,
}

EISA bus root device driver.

Definition at line 181 of file eisa.c.

__root_device

struct root_device eisa_root_device __root_device

Initial value:

= {
        .dev = { .name = "EISA" },
        .driver = &eisa_root_driver,
}

EISA bus root device.

Definition at line 187 of file eisa.c.