17568cb4eSPaul Mackerras /* 27568cb4eSPaul Mackerras * hvconsole.c 37568cb4eSPaul Mackerras * Copyright (C) 2004 Hollis Blanchard, IBM Corporation 47568cb4eSPaul Mackerras * Copyright (C) 2004 IBM Corporation 57568cb4eSPaul Mackerras * 67568cb4eSPaul Mackerras * Additional Author(s): 77568cb4eSPaul Mackerras * Ryan S. Arnold <rsa@us.ibm.com> 87568cb4eSPaul Mackerras * 97568cb4eSPaul Mackerras * LPAR console support. 107568cb4eSPaul Mackerras * 117568cb4eSPaul Mackerras * This program is free software; you can redistribute it and/or modify 127568cb4eSPaul Mackerras * it under the terms of the GNU General Public License as published by 137568cb4eSPaul Mackerras * the Free Software Foundation; either version 2 of the License, or 147568cb4eSPaul Mackerras * (at your option) any later version. 157568cb4eSPaul Mackerras * 167568cb4eSPaul Mackerras * This program is distributed in the hope that it will be useful, 177568cb4eSPaul Mackerras * but WITHOUT ANY WARRANTY; without even the implied warranty of 187568cb4eSPaul Mackerras * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 197568cb4eSPaul Mackerras * GNU General Public License for more details. 207568cb4eSPaul Mackerras * 217568cb4eSPaul Mackerras * You should have received a copy of the GNU General Public License 227568cb4eSPaul Mackerras * along with this program; if not, write to the Free Software 237568cb4eSPaul Mackerras * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 247568cb4eSPaul Mackerras */ 257568cb4eSPaul Mackerras 267568cb4eSPaul Mackerras #include <linux/kernel.h> 27e9848d62SPaul Gortmaker #include <linux/export.h> 28e9848d62SPaul Gortmaker #include <linux/errno.h> 297568cb4eSPaul Mackerras #include <asm/hvcall.h> 307568cb4eSPaul Mackerras #include <asm/hvconsole.h> 31212bebb4SDeepthi Dharwar #include <asm/plpar_wrappers.h> 327568cb4eSPaul Mackerras 337568cb4eSPaul Mackerras /** 347568cb4eSPaul Mackerras * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper 357568cb4eSPaul Mackerras * @vtermno: The vtermno or unit_address of the adapter from which to fetch the 367568cb4eSPaul Mackerras * data. 377568cb4eSPaul Mackerras * @buf: The character buffer into which to put the character data fetched from 387568cb4eSPaul Mackerras * firmware. 397568cb4eSPaul Mackerras * @count: not used? 407568cb4eSPaul Mackerras */ 417568cb4eSPaul Mackerras int hvc_get_chars(uint32_t vtermno, char *buf, int count) 427568cb4eSPaul Mackerras { 43a0a96ee9SAnton Blanchard long ret; 44a0a96ee9SAnton Blanchard unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; 45a0a96ee9SAnton Blanchard unsigned long *lbuf = (unsigned long *)buf; 467568cb4eSPaul Mackerras 47a0a96ee9SAnton Blanchard ret = plpar_hcall(H_GET_TERM_CHAR, retbuf, vtermno); 48a02f6dfcSAnton Blanchard lbuf[0] = be64_to_cpu(retbuf[1]); 49a02f6dfcSAnton Blanchard lbuf[1] = be64_to_cpu(retbuf[2]); 50a0a96ee9SAnton Blanchard 51a0a96ee9SAnton Blanchard if (ret == H_SUCCESS) 52a0a96ee9SAnton Blanchard return retbuf[0]; 53b9377ffcSAnton Blanchard 547568cb4eSPaul Mackerras return 0; 557568cb4eSPaul Mackerras } 567568cb4eSPaul Mackerras 577568cb4eSPaul Mackerras EXPORT_SYMBOL(hvc_get_chars); 587568cb4eSPaul Mackerras 597568cb4eSPaul Mackerras 607568cb4eSPaul Mackerras /** 617568cb4eSPaul Mackerras * hvc_put_chars: send characters to firmware for denoted vterm adapter 627568cb4eSPaul Mackerras * @vtermno: The vtermno or unit_address of the adapter from which the data 637568cb4eSPaul Mackerras * originated. 647568cb4eSPaul Mackerras * @buf: The character buffer that contains the character data to send to 657568cb4eSPaul Mackerras * firmware. 667568cb4eSPaul Mackerras * @count: Send this number of characters. 677568cb4eSPaul Mackerras */ 687568cb4eSPaul Mackerras int hvc_put_chars(uint32_t vtermno, const char *buf, int count) 697568cb4eSPaul Mackerras { 707568cb4eSPaul Mackerras unsigned long *lbuf = (unsigned long *) buf; 717568cb4eSPaul Mackerras long ret; 727568cb4eSPaul Mackerras 7345d607edSRyan S. Arnold 7445d607edSRyan S. Arnold /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/ 7545d607edSRyan S. Arnold if (count > MAX_VIO_PUT_CHARS) 7645d607edSRyan S. Arnold count = MAX_VIO_PUT_CHARS; 7745d607edSRyan S. Arnold 78a02f6dfcSAnton Blanchard ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, 79a02f6dfcSAnton Blanchard cpu_to_be64(lbuf[0]), 80a02f6dfcSAnton Blanchard cpu_to_be64(lbuf[1])); 81706c8c93SSegher Boessenkool if (ret == H_SUCCESS) 827568cb4eSPaul Mackerras return count; 83706c8c93SSegher Boessenkool if (ret == H_BUSY) 8451d33021SAnton Blanchard return -EAGAIN; 857568cb4eSPaul Mackerras return -EIO; 867568cb4eSPaul Mackerras } 877568cb4eSPaul Mackerras 887568cb4eSPaul Mackerras EXPORT_SYMBOL(hvc_put_chars); 89