122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/*
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* hvconsole.c
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* Copyright (C) 2004 Hollis Blanchard, IBM Corporation
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* Copyright (C) 2004 IBM Corporation
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*
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* Additional Author(s):
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* Ryan S. Arnold <rsa@us.ibm.com>
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*
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* LPAR console support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/hvcall.h>
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#include <asm/hvconsole.h>
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#include <asm/prom.h>
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/**
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* hvc_get_chars - retrieve characters from firmware for denoted vterm adatper
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* @vtermno: The vtermno or unit_address of the adapter from which to fetch the
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* data.
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* @buf: The character buffer into which to put the character data fetched from
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* firmware.
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* @count: not used?
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*/
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int hvc_get_chars(uint32_t vtermno, char *buf, int count)
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{
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unsigned long got;
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if (plpar_hcall(H_GET_TERM_CHAR, vtermno, 0, 0, 0, &got,
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(unsigned long *)buf, (unsigned long *)buf+1) == H_Success) {
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/*
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* Work around a HV bug where it gives us a null
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* after every \r. -- paulus
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*/
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if (got > 0) {
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int i;
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for (i = 1; i < got; ++i) {
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if (buf[i] == 0 && buf[i-1] == '\r') {
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--got;
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if (i < got)
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memmove(&buf[i], &buf[i+1],
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got - i);
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}
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}
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}
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return got;
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}
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return 0;
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}
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EXPORT_SYMBOL(hvc_get_chars);
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/**
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* hvc_put_chars: send characters to firmware for denoted vterm adapter
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* @vtermno: The vtermno or unit_address of the adapter from which the data
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* originated.
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* @buf: The character buffer that contains the character data to send to
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* firmware.
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* @count: Send this number of characters.
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*/
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int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
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{
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unsigned long *lbuf = (unsigned long *) buf;
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long ret;
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ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
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lbuf[1]);
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if (ret == H_Success)
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return count;
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if (ret == H_Busy)
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return 0;
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return -EIO;
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}
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EXPORT_SYMBOL(hvc_put_chars);
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/*
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* We hope/assume that the first vty found corresponds to the first console
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* device.
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*/
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int hvc_find_vtys(void)
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{
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struct device_node *vty;
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int num_found = 0;
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for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
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vty = of_find_node_by_name(vty, "vty")) {
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uint32_t *vtermno;
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/* We have statically defined space for only a certain number of
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* console adapters. */
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if (num_found >= MAX_NR_HVC_CONSOLES)
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break;
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vtermno = (uint32_t *)get_property(vty, "reg", NULL);
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if (!vtermno)
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continue;
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if (device_is_compatible(vty, "hvterm1")) {
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hvc_instantiate(*vtermno, num_found);
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++num_found;
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}
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}
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return num_found;
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}
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