247 lines
6.5 KiB
C
247 lines
6.5 KiB
C
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/*-
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* Copyright (c) 1999 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <isa/isavar.h>
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#include <isa/pnpreg.h>
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#include <isa/pnpvar.h>
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/*
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* Parse resource data for Logical Devices.
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*
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* This function exits as soon as it gets an error reading *ANY*
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* Resource Data or ir reaches the end of Resource Data. In the first
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* case the return value will be TRUE, FALSE otherwise.
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*/
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void
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pnp_parse_resources(device_t dev, u_char *resources, int len)
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{
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device_t parent = device_get_parent(dev);
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u_char tag, *resp, *resinfo;
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int large_len, scanning = len;
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u_int32_t compat_id;
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struct isa_config logdev, alt;
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struct isa_config *config;
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int priority = 0;
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int seenalt = 0;
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char buf[100];
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bzero(&logdev, sizeof logdev);
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bzero(&alt, sizeof alt);
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config = &logdev;
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resp = resources;
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while (scanning > 0) {
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tag = *resp++;
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scanning--;
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if (PNP_RES_TYPE(tag) == 0) {
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/* Small resource */
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if (scanning < PNP_SRES_LEN(tag)) {
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scanning = 0;
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continue;
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}
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resinfo = resp;
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resp += PNP_SRES_LEN(tag);
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scanning -= PNP_SRES_LEN(tag);;
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switch (PNP_SRES_NUM(tag)) {
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case PNP_TAG_COMPAT_DEVICE:
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/*
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* Got a compatible device id
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* resource. Should keep a list of
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* compat ids in the device.
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*/
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bcopy(resinfo, &compat_id, 4);
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isa_set_compatid(dev, compat_id);
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break;
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case PNP_TAG_IRQ_FORMAT:
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if (config->ic_nirq == ISA_NIRQ) {
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device_printf(parent, "too many irqs");
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scanning = 0;
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break;
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}
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config->ic_irqmask[config->ic_nirq] =
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resinfo[0] + (resinfo[1]<<8);
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config->ic_nirq++;
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break;
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case PNP_TAG_DMA_FORMAT:
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if (config->ic_ndrq == ISA_NDRQ) {
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device_printf(parent, "too many drqs");
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scanning = 0;
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break;
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}
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config->ic_drqmask[config->ic_ndrq] =
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resinfo[0];
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config->ic_ndrq++;
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break;
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case PNP_TAG_START_DEPENDANT:
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if (config == &alt) {
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ISA_ADD_CONFIG(parent, dev,
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priority, config);
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} else if (config != &logdev) {
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device_printf(parent, "malformed\n");
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scanning = 0;
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break;
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}
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/*
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* If the priority is not specified,
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* then use the default of
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* 'acceptable'
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*/
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if (PNP_SRES_LEN(tag) > 0)
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priority = resinfo[0];
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else
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priority = 1;
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alt = logdev;
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config = &alt;
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break;
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case PNP_TAG_END_DEPENDANT:
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ISA_ADD_CONFIG(parent, dev, priority, config);
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config = &logdev;
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seenalt = 1;
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break;
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case PNP_TAG_IO_RANGE:
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if (config->ic_nport == ISA_NPORT) {
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device_printf(parent, "too many ports");
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scanning = 0;
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break;
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}
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config->ic_port[config->ic_nport].ir_start =
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resinfo[1] + (resinfo[2]<<8);
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config->ic_port[config->ic_nport].ir_end =
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resinfo[3] + (resinfo[4]<<8)
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+ resinfo[6] - 1;
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config->ic_port[config->ic_nport].ir_size
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=
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resinfo[6];
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config->ic_port[config->ic_nport].ir_align =
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resinfo[5];
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config->ic_nport++;
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break;
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case PNP_TAG_IO_FIXED:
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if (config->ic_nport == ISA_NPORT) {
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device_printf(parent, "too many ports");
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scanning = 0;
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break;
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}
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config->ic_port[config->ic_nport].ir_start =
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resinfo[0] + (resinfo[1]<<8);
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config->ic_port[config->ic_nport].ir_end =
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resinfo[0] + (resinfo[1]<<8)
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+ resinfo[2] - 1;
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config->ic_port[config->ic_nport].ir_size
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= resinfo[2];
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config->ic_port[config->ic_nport].ir_align = 1;
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config->ic_nport++;
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break;
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default:
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/* Skip this resource */
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device_printf(parent, "unexpected tag %d\n",
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PNP_SRES_NUM(tag));
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break;
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}
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} else {
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/* Large resource */
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if (scanning < 2) {
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scanning = 0;
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continue;
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}
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large_len = resp[0] + (resp[1] << 8);
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resp += 2;
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scanning -= 2;
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if (scanning < large_len) {
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scanning = 0;
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continue;
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}
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resinfo = resp;
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resp += large_len;
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scanning -= large_len;
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if (PNP_LRES_NUM(tag) == PNP_TAG_ID_ANSI) {
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if (large_len > sizeof(buf) - 1)
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large_len = sizeof(buf) - 1;
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bcopy(resinfo, buf, large_len);
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/*
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* Trim trailing spaces.
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*/
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while (buf[large_len-1] == ' ')
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large_len--;
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buf[large_len] = '\0';
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device_set_desc_copy(dev, buf);
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continue;
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}
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if (PNP_LRES_NUM(tag) != PNP_TAG_MEMORY_RANGE) {
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/* skip */
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continue;
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}
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if (config->ic_nmem == ISA_NMEM) {
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device_printf(parent, "too many memory ranges");
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scanning = 0;
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break;
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}
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config->ic_mem[config->ic_nmem].ir_start =
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(resinfo[4]<<8) + (resinfo[5]<<16);
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config->ic_mem[config->ic_nmem].ir_end =
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(resinfo[6]<<8) + (resinfo[7]<<16);
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config->ic_mem[config->ic_nmem].ir_size =
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(resinfo[10]<<8) + (resinfo[11]<<16);
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config->ic_mem[config->ic_nmem].ir_align =
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resinfo[8] + (resinfo[9]<<8);
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if (!config->ic_mem[config->ic_nmem].ir_align)
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config->ic_mem[config->ic_nmem].ir_align =
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0x10000;
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config->ic_nmem++;
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}
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}
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/*
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* Some devices (e.g. network cards) don't have start
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* dependant tags and only have a single configuration. If we
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* finish parsing without seeing an end dependant tag, add the
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* non-dependant configuration to the device.
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*/
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if (!seenalt)
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ISA_ADD_CONFIG(parent, dev, 1, config);
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}
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