NetBSD/sys/dev/ic/ate_subr.c

151 lines
4.9 KiB
C

/* $NetBSD: ate_subr.c,v 1.2 2001/11/13 13:14:35 lukem Exp $ */
/*
* All Rights Reserved, Copyright (C) Fujitsu Limited 1995
*
* This software may be used, modified, copied, distributed, and sold, in
* both source and binary form provided that the above copyright, these
* terms and the following disclaimer are retained. The name of the author
* and/or the contributor may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND THE CONTRIBUTOR ``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 THE CONTRIBUTOR 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.
*/
/*
* Portions copyright (C) 1993, David Greenman. This software may be used,
* modified, copied, distributed, and sold, in both source and binary form
* provided that the above copyright and these terms are retained. Under no
* circumstances is the author responsible for the proper functioning of this
* software, nor does the author assume any responsibility for damages
* incurred with its use.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ate_subr.c,v 1.2 2001/11/13 13:14:35 lukem Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/ic/mb86960reg.h>
#include <dev/ic/ate_subr.h>
#include <dev/isa/if_fereg.h> /* XXX */
static __inline__ void ate_strobe __P((bus_space_tag_t, bus_space_handle_t));
/*
* Routines to read all bytes from the config EEPROM through MB86965A.
* I'm not sure what exactly I'm doing here... I was told just to follow
* the steps, and it worked. Could someone tell me why the following
* code works? (Or, why all similar codes I tried previously doesn't
* work.) FIXME.
*/
static __inline__ void
ate_strobe (iot, ioh)
bus_space_tag_t iot;
bus_space_handle_t ioh;
{
/*
* Output same value twice. To speed-down execution?
*/
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT);
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT);
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT | FE_B16_CLOCK);
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT | FE_B16_CLOCK);
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT);
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT);
}
void
ate_read_eeprom(iot, ioh, data)
bus_space_tag_t iot;
bus_space_handle_t ioh;
u_char *data;
{
int n, count;
u_char val, bit;
/* Read bytes from EEPROM; two bytes per an iteration. */
for (n = 0; n < FE_EEPROM_SIZE / 2; n++) {
/* Reset the EEPROM interface. */
bus_space_write_1(iot, ioh, FE_BMPR16, 0x00);
bus_space_write_1(iot, ioh, FE_BMPR17, 0x00);
bus_space_write_1(iot, ioh, FE_BMPR16, FE_B16_SELECT);
/* Start EEPROM access. */
bus_space_write_1(iot, ioh, FE_BMPR17, FE_B17_DATA);
ate_strobe(iot, ioh);
/* Pass the iteration count to the chip. */
count = 0x80 | n;
for (bit = 0x80; bit != 0x00; bit >>= 1) {
bus_space_write_1(iot, ioh, FE_BMPR17,
(count & bit) ? FE_B17_DATA : 0);
ate_strobe(iot, ioh);
}
bus_space_write_1(iot, ioh, FE_BMPR17, 0x00);
/* Read a byte. */
val = 0;
for (bit = 0x80; bit != 0x00; bit >>= 1) {
ate_strobe(iot, ioh);
if (bus_space_read_1(iot, ioh, FE_BMPR17) &
FE_B17_DATA)
val |= bit;
}
*data++ = val;
/* Read one more byte. */
val = 0;
for (bit = 0x80; bit != 0x00; bit >>= 1) {
ate_strobe(iot, ioh);
if (bus_space_read_1(iot, ioh, FE_BMPR17) &
FE_B17_DATA)
val |= bit;
}
*data++ = val;
}
/* Make sure the EEPROM is turned off. */
bus_space_write_1(iot, ioh, FE_BMPR16, 0);
bus_space_write_1(iot, ioh, FE_BMPR17, 0);
#if ATE_DEBUG >= 3
/* Report what we got. */
data -= FE_EEPROM_SIZE;
log(LOG_INFO, "ate_read_eeprom: EEPROM at %04x:"
" %02x%02x%02x%02x %02x%02x%02x%02x -"
" %02x%02x%02x%02x %02x%02x%02x%02x -"
" %02x%02x%02x%02x %02x%02x%02x%02x -"
" %02x%02x%02x%02x %02x%02x%02x%02x\n",
(int) ioh, /* XXX */
data[ 0], data[ 1], data[ 2], data[ 3],
data[ 4], data[ 5], data[ 6], data[ 7],
data[ 8], data[ 9], data[10], data[11],
data[12], data[13], data[14], data[15],
data[16], data[17], data[18], data[19],
data[20], data[21], data[22], data[23],
data[24], data[25], data[26], data[27],
data[28], data[29], data[30], data[31]);
#endif
}