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1275 |
phoenix |
/*
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* Copyright (C) 1994-1996 Bas Laarhoven,
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* (C) 1996-1997 Claus-Justus Heine.
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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, or (at your option)
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any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Source: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/linux/linux-2.4/drivers/char/ftape/lowlevel/fdc-isr.c,v $
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* $Revision: 1.1.1.1 $
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* $Date: 2004-04-15 02:02:33 $
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*
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* This file contains the interrupt service routine and
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* associated code for the QIC-40/80/3010/3020 floppy-tape driver
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* "ftape" for Linux.
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*/
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#include <asm/io.h>
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#include <asm/dma.h>
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#define volatile /* */
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#include <linux/ftape.h>
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#include <linux/qic117.h>
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#include "../lowlevel/ftape-tracing.h"
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#include "../lowlevel/fdc-isr.h"
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#include "../lowlevel/fdc-io.h"
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#include "../lowlevel/ftape-ctl.h"
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#include "../lowlevel/ftape-rw.h"
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#include "../lowlevel/ftape-io.h"
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#include "../lowlevel/ftape-calibr.h"
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#include "../lowlevel/ftape-bsm.h"
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/* Global vars.
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*/
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volatile int ft_expected_stray_interrupts;
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volatile int ft_interrupt_seen;
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volatile int ft_seek_completed;
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volatile int ft_hide_interrupt;
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/* Local vars.
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*/
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typedef enum {
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no_error = 0, id_am_error = 0x01, id_crc_error = 0x02,
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data_am_error = 0x04, data_crc_error = 0x08,
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no_data_error = 0x10, overrun_error = 0x20,
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} error_cause;
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static int stop_read_ahead;
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static void print_error_cause(int cause)
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{
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TRACE_FUN(ft_t_any);
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switch (cause) {
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case no_data_error:
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TRACE(ft_t_noise, "no data error");
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break;
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case id_am_error:
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TRACE(ft_t_noise, "id am error");
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break;
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case id_crc_error:
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TRACE(ft_t_noise, "id crc error");
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break;
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case data_am_error:
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TRACE(ft_t_noise, "data am error");
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break;
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case data_crc_error:
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TRACE(ft_t_noise, "data crc error");
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break;
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case overrun_error:
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TRACE(ft_t_noise, "overrun error");
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break;
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default:;
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}
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TRACE_EXIT;
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}
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static char *fdc_mode_txt(fdc_mode_enum mode)
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{
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switch (mode) {
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case fdc_idle:
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return "fdc_idle";
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case fdc_reading_data:
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return "fdc_reading_data";
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case fdc_seeking:
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return "fdc_seeking";
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case fdc_writing_data:
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return "fdc_writing_data";
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case fdc_reading_id:
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return "fdc_reading_id";
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case fdc_recalibrating:
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return "fdc_recalibrating";
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case fdc_formatting:
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return "fdc_formatting";
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case fdc_verifying:
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return "fdc_verifying";
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default:
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return "unknown";
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}
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}
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static inline error_cause decode_irq_cause(fdc_mode_enum mode, __u8 st[])
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{
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error_cause cause = no_error;
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TRACE_FUN(ft_t_any);
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/* Valid st[], decode cause of interrupt.
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*/
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switch (st[0] & ST0_INT_MASK) {
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case FDC_INT_NORMAL:
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TRACE(ft_t_fdc_dma,"normal completion: %s",fdc_mode_txt(mode));
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break;
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case FDC_INT_ABNORMAL:
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TRACE(ft_t_flow, "abnormal completion %s", fdc_mode_txt(mode));
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TRACE(ft_t_fdc_dma, "ST0: 0x%02x, ST1: 0x%02x, ST2: 0x%02x",
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st[0], st[1], st[2]);
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TRACE(ft_t_fdc_dma,
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"C: 0x%02x, H: 0x%02x, R: 0x%02x, N: 0x%02x",
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st[3], st[4], st[5], st[6]);
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if (st[1] & 0x01) {
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if (st[2] & 0x01) {
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cause = data_am_error;
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} else {
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cause = id_am_error;
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}
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} else if (st[1] & 0x20) {
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if (st[2] & 0x20) {
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cause = data_crc_error;
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} else {
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cause = id_crc_error;
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}
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} else if (st[1] & 0x04) {
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cause = no_data_error;
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} else if (st[1] & 0x10) {
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cause = overrun_error;
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}
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print_error_cause(cause);
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break;
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case FDC_INT_INVALID:
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TRACE(ft_t_flow, "invalid completion %s", fdc_mode_txt(mode));
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break;
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case FDC_INT_READYCH:
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if (st[0] & ST0_SEEK_END) {
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TRACE(ft_t_flow, "drive poll completed");
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} else {
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TRACE(ft_t_flow, "ready change %s",fdc_mode_txt(mode));
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}
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break;
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default:
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break;
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}
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TRACE_EXIT cause;
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}
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static void update_history(error_cause cause)
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{
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switch (cause) {
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case id_am_error:
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ft_history.id_am_errors++;
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break;
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case id_crc_error:
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ft_history.id_crc_errors++;
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break;
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case data_am_error:
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ft_history.data_am_errors++;
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break;
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case data_crc_error:
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ft_history.data_crc_errors++;
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break;
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| 181 |
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case overrun_error:
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ft_history.overrun_errors++;
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break;
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case no_data_error:
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ft_history.no_data_errors++;
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break;
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default:;
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}
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}
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static void skip_bad_sector(buffer_struct * buff)
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{
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TRACE_FUN(ft_t_any);
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| 195 |
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/* Mark sector as soft error and skip it
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*/
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| 197 |
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if (buff->remaining > 0) {
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| 198 |
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++buff->sector_offset;
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++buff->data_offset;
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--buff->remaining;
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buff->ptr += FT_SECTOR_SIZE;
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buff->bad_sector_map >>= 1;
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} else {
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/* Hey, what is this????????????? C code: if we shift
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* more than 31 bits, we get no shift. That's bad!!!!!!
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*/
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++buff->sector_offset; /* hack for error maps */
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TRACE(ft_t_warn, "skipping last sector in segment");
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}
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| 210 |
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TRACE_EXIT;
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}
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| 213 |
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static void update_error_maps(buffer_struct * buff, unsigned int error_offset)
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{
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int hard = 0;
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TRACE_FUN(ft_t_any);
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| 218 |
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if (buff->retry < FT_SOFT_RETRIES) {
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buff->soft_error_map |= (1 << error_offset);
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} else {
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buff->hard_error_map |= (1 << error_offset);
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buff->soft_error_map &= ~buff->hard_error_map;
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buff->retry = -1; /* will be set to 0 in setup_segment */
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| 224 |
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hard = 1;
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}
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| 226 |
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TRACE(ft_t_noise, "sector %d : %s error\n"
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KERN_INFO "hard map: 0x%08lx\n"
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KERN_INFO "soft map: 0x%08lx",
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FT_SECTOR(error_offset), hard ? "hard" : "soft",
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(long) buff->hard_error_map, (long) buff->soft_error_map);
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TRACE_EXIT;
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| 232 |
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}
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| 233 |
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| 234 |
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static void print_progress(buffer_struct *buff, error_cause cause)
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| 235 |
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{
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| 236 |
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TRACE_FUN(ft_t_any);
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| 237 |
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| 238 |
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switch (cause) {
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| 239 |
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case no_error:
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| 240 |
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TRACE(ft_t_flow,"%d Sector(s) transferred", buff->sector_count);
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| 241 |
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break;
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| 242 |
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case no_data_error:
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| 243 |
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TRACE(ft_t_flow, "Sector %d not found",
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| 244 |
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FT_SECTOR(buff->sector_offset));
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| 245 |
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break;
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| 246 |
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case overrun_error:
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| 247 |
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/* got an overrun error on the first byte, must be a
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| 248 |
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* hardware problem
|
| 249 |
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*/
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| 250 |
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TRACE(ft_t_bug,
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| 251 |
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"Unexpected error: failing DMA or FDC controller ?");
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| 252 |
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break;
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| 253 |
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case data_crc_error:
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| 254 |
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TRACE(ft_t_flow, "Error in sector %d",
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| 255 |
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FT_SECTOR(buff->sector_offset - 1));
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| 256 |
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break;
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| 257 |
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case id_crc_error:
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| 258 |
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case id_am_error:
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| 259 |
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case data_am_error:
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| 260 |
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TRACE(ft_t_flow, "Error in sector %d",
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| 261 |
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FT_SECTOR(buff->sector_offset));
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| 262 |
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break;
|
| 263 |
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default:
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| 264 |
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TRACE(ft_t_flow, "Unexpected error at sector %d",
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| 265 |
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FT_SECTOR(buff->sector_offset));
|
| 266 |
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break;
|
| 267 |
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}
|
| 268 |
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TRACE_EXIT;
|
| 269 |
|
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}
|
| 270 |
|
|
|
| 271 |
|
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/*
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| 272 |
|
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* Error cause: Amount xferred: Action:
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| 273 |
|
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*
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| 274 |
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* id_am_error 0 mark bad and skip
|
| 275 |
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* id_crc_error 0 mark bad and skip
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| 276 |
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* data_am_error 0 mark bad and skip
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| 277 |
|
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* data_crc_error % 1024 mark bad and skip
|
| 278 |
|
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* no_data_error 0 retry on write
|
| 279 |
|
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* mark bad and skip on read
|
| 280 |
|
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* overrun_error [ 0..all-1 ] mark bad and skip
|
| 281 |
|
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* no_error all continue
|
| 282 |
|
|
*/
|
| 283 |
|
|
|
| 284 |
|
|
/* the arg `sector' is returned by the fdc and tells us at which sector we
|
| 285 |
|
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* are positioned at (relative to starting sector of segment)
|
| 286 |
|
|
*/
|
| 287 |
|
|
static void determine_verify_progress(buffer_struct *buff,
|
| 288 |
|
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error_cause cause,
|
| 289 |
|
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__u8 sector)
|
| 290 |
|
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{
|
| 291 |
|
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TRACE_FUN(ft_t_any);
|
| 292 |
|
|
|
| 293 |
|
|
if (cause == no_error && sector == 1) {
|
| 294 |
|
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buff->sector_offset = FT_SECTORS_PER_SEGMENT;
|
| 295 |
|
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buff->remaining = 0;
|
| 296 |
|
|
if (TRACE_LEVEL >= ft_t_flow) {
|
| 297 |
|
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print_progress(buff, cause);
|
| 298 |
|
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}
|
| 299 |
|
|
} else {
|
| 300 |
|
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buff->sector_offset = sector - buff->sect;
|
| 301 |
|
|
buff->remaining = FT_SECTORS_PER_SEGMENT - buff->sector_offset;
|
| 302 |
|
|
TRACE(ft_t_noise, "%ssector offset: 0x%04x",
|
| 303 |
|
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(cause == no_error) ? "unexpected " : "",
|
| 304 |
|
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buff->sector_offset);
|
| 305 |
|
|
switch (cause) {
|
| 306 |
|
|
case overrun_error:
|
| 307 |
|
|
break;
|
| 308 |
|
|
#if 0
|
| 309 |
|
|
case no_data_error:
|
| 310 |
|
|
buff->retry = FT_SOFT_RETRIES;
|
| 311 |
|
|
if (buff->hard_error_map &&
|
| 312 |
|
|
buff->sector_offset > 1 &&
|
| 313 |
|
|
(buff->hard_error_map &
|
| 314 |
|
|
(1 << (buff->sector_offset-2)))) {
|
| 315 |
|
|
buff->retry --;
|
| 316 |
|
|
}
|
| 317 |
|
|
break;
|
| 318 |
|
|
#endif
|
| 319 |
|
|
default:
|
| 320 |
|
|
buff->retry = FT_SOFT_RETRIES;
|
| 321 |
|
|
break;
|
| 322 |
|
|
}
|
| 323 |
|
|
if (TRACE_LEVEL >= ft_t_flow) {
|
| 324 |
|
|
print_progress(buff, cause);
|
| 325 |
|
|
}
|
| 326 |
|
|
/* Sector_offset points to the problem area Now adjust
|
| 327 |
|
|
* sector_offset so it always points one past he failing
|
| 328 |
|
|
* sector. I.e. skip the bad sector.
|
| 329 |
|
|
*/
|
| 330 |
|
|
++buff->sector_offset;
|
| 331 |
|
|
--buff->remaining;
|
| 332 |
|
|
update_error_maps(buff, buff->sector_offset - 1);
|
| 333 |
|
|
}
|
| 334 |
|
|
TRACE_EXIT;
|
| 335 |
|
|
}
|
| 336 |
|
|
|
| 337 |
|
|
static void determine_progress(buffer_struct *buff,
|
| 338 |
|
|
error_cause cause,
|
| 339 |
|
|
__u8 sector)
|
| 340 |
|
|
{
|
| 341 |
|
|
unsigned int dma_residue;
|
| 342 |
|
|
TRACE_FUN(ft_t_any);
|
| 343 |
|
|
|
| 344 |
|
|
/* Using less preferred order of disable_dma and
|
| 345 |
|
|
* get_dma_residue because this seems to fail on at least one
|
| 346 |
|
|
* system if reversed!
|
| 347 |
|
|
*/
|
| 348 |
|
|
dma_residue = get_dma_residue(fdc.dma);
|
| 349 |
|
|
disable_dma(fdc.dma);
|
| 350 |
|
|
if (cause != no_error || dma_residue != 0) {
|
| 351 |
|
|
TRACE(ft_t_noise, "%sDMA residue: 0x%04x",
|
| 352 |
|
|
(cause == no_error) ? "unexpected " : "",
|
| 353 |
|
|
dma_residue);
|
| 354 |
|
|
/* adjust to actual value: */
|
| 355 |
|
|
if (dma_residue == 0) {
|
| 356 |
|
|
/* this happens sometimes with overrun errors.
|
| 357 |
|
|
* I don't know whether we could ignore the
|
| 358 |
|
|
* overrun error. Play save.
|
| 359 |
|
|
*/
|
| 360 |
|
|
buff->sector_count --;
|
| 361 |
|
|
} else {
|
| 362 |
|
|
buff->sector_count -= ((dma_residue +
|
| 363 |
|
|
(FT_SECTOR_SIZE - 1)) /
|
| 364 |
|
|
FT_SECTOR_SIZE);
|
| 365 |
|
|
}
|
| 366 |
|
|
}
|
| 367 |
|
|
/* Update var's influenced by the DMA operation.
|
| 368 |
|
|
*/
|
| 369 |
|
|
if (buff->sector_count > 0) {
|
| 370 |
|
|
buff->sector_offset += buff->sector_count;
|
| 371 |
|
|
buff->data_offset += buff->sector_count;
|
| 372 |
|
|
buff->ptr += (buff->sector_count *
|
| 373 |
|
|
FT_SECTOR_SIZE);
|
| 374 |
|
|
buff->remaining -= buff->sector_count;
|
| 375 |
|
|
buff->bad_sector_map >>= buff->sector_count;
|
| 376 |
|
|
}
|
| 377 |
|
|
if (TRACE_LEVEL >= ft_t_flow) {
|
| 378 |
|
|
print_progress(buff, cause);
|
| 379 |
|
|
}
|
| 380 |
|
|
if (cause != no_error) {
|
| 381 |
|
|
if (buff->remaining == 0) {
|
| 382 |
|
|
TRACE(ft_t_warn, "foo?\n"
|
| 383 |
|
|
KERN_INFO "count : %d\n"
|
| 384 |
|
|
KERN_INFO "offset: %d\n"
|
| 385 |
|
|
KERN_INFO "soft : %08x\n"
|
| 386 |
|
|
KERN_INFO "hard : %08x",
|
| 387 |
|
|
buff->sector_count,
|
| 388 |
|
|
buff->sector_offset,
|
| 389 |
|
|
buff->soft_error_map,
|
| 390 |
|
|
buff->hard_error_map);
|
| 391 |
|
|
}
|
| 392 |
|
|
/* Sector_offset points to the problem area, except if we got
|
| 393 |
|
|
* a data_crc_error. In that case it points one past the
|
| 394 |
|
|
* failing sector.
|
| 395 |
|
|
*
|
| 396 |
|
|
* Now adjust sector_offset so it always points one past he
|
| 397 |
|
|
* failing sector. I.e. skip the bad sector.
|
| 398 |
|
|
*/
|
| 399 |
|
|
if (cause != data_crc_error) {
|
| 400 |
|
|
skip_bad_sector(buff);
|
| 401 |
|
|
}
|
| 402 |
|
|
update_error_maps(buff, buff->sector_offset - 1);
|
| 403 |
|
|
}
|
| 404 |
|
|
TRACE_EXIT;
|
| 405 |
|
|
}
|
| 406 |
|
|
|
| 407 |
|
|
static int calc_steps(int cmd)
|
| 408 |
|
|
{
|
| 409 |
|
|
if (ftape_current_cylinder > cmd) {
|
| 410 |
|
|
return ftape_current_cylinder - cmd;
|
| 411 |
|
|
} else {
|
| 412 |
|
|
return ftape_current_cylinder + cmd;
|
| 413 |
|
|
}
|
| 414 |
|
|
}
|
| 415 |
|
|
|
| 416 |
|
|
static void pause_tape(int retry, int mode)
|
| 417 |
|
|
{
|
| 418 |
|
|
int result;
|
| 419 |
|
|
__u8 out[3] = {FDC_SEEK, ft_drive_sel, 0};
|
| 420 |
|
|
TRACE_FUN(ft_t_any);
|
| 421 |
|
|
|
| 422 |
|
|
/* We'll use a raw seek command to get the tape to rewind and
|
| 423 |
|
|
* stop for a retry.
|
| 424 |
|
|
*/
|
| 425 |
|
|
++ft_history.rewinds;
|
| 426 |
|
|
if (qic117_cmds[ftape_current_command].non_intr) {
|
| 427 |
|
|
TRACE(ft_t_warn, "motion command may be issued too soon");
|
| 428 |
|
|
}
|
| 429 |
|
|
if (retry && (mode == fdc_reading_data ||
|
| 430 |
|
|
mode == fdc_reading_id ||
|
| 431 |
|
|
mode == fdc_verifying)) {
|
| 432 |
|
|
ftape_current_command = QIC_MICRO_STEP_PAUSE;
|
| 433 |
|
|
ftape_might_be_off_track = 1;
|
| 434 |
|
|
} else {
|
| 435 |
|
|
ftape_current_command = QIC_PAUSE;
|
| 436 |
|
|
}
|
| 437 |
|
|
out[2] = calc_steps(ftape_current_command);
|
| 438 |
|
|
result = fdc_command(out, 3); /* issue QIC_117 command */
|
| 439 |
|
|
ftape_current_cylinder = out[ 2];
|
| 440 |
|
|
if (result < 0) {
|
| 441 |
|
|
TRACE(ft_t_noise, "qic-pause failed, status = %d", result);
|
| 442 |
|
|
} else {
|
| 443 |
|
|
ft_location.known = 0;
|
| 444 |
|
|
ft_runner_status = idle;
|
| 445 |
|
|
ft_hide_interrupt = 1;
|
| 446 |
|
|
ftape_tape_running = 0;
|
| 447 |
|
|
}
|
| 448 |
|
|
TRACE_EXIT;
|
| 449 |
|
|
}
|
| 450 |
|
|
|
| 451 |
|
|
static void continue_xfer(buffer_struct *buff,
|
| 452 |
|
|
fdc_mode_enum mode,
|
| 453 |
|
|
unsigned int skip)
|
| 454 |
|
|
{
|
| 455 |
|
|
int write = 0;
|
| 456 |
|
|
TRACE_FUN(ft_t_any);
|
| 457 |
|
|
|
| 458 |
|
|
if (mode == fdc_writing_data || mode == fdc_deleting) {
|
| 459 |
|
|
write = 1;
|
| 460 |
|
|
}
|
| 461 |
|
|
/* This part can be removed if it never happens
|
| 462 |
|
|
*/
|
| 463 |
|
|
if (skip > 0 &&
|
| 464 |
|
|
(ft_runner_status != running ||
|
| 465 |
|
|
(write && (buff->status != writing)) ||
|
| 466 |
|
|
(!write && (buff->status != reading &&
|
| 467 |
|
|
buff->status != verifying)))) {
|
| 468 |
|
|
TRACE(ft_t_err, "unexpected runner/buffer state %d/%d",
|
| 469 |
|
|
ft_runner_status, buff->status);
|
| 470 |
|
|
buff->status = error;
|
| 471 |
|
|
/* finish this buffer: */
|
| 472 |
|
|
(void)ftape_next_buffer(ft_queue_head);
|
| 473 |
|
|
ft_runner_status = aborting;
|
| 474 |
|
|
fdc_mode = fdc_idle;
|
| 475 |
|
|
} else if (buff->remaining > 0 && ftape_calc_next_cluster(buff) > 0) {
|
| 476 |
|
|
/* still sectors left in current segment, continue
|
| 477 |
|
|
* with this segment
|
| 478 |
|
|
*/
|
| 479 |
|
|
if (fdc_setup_read_write(buff, mode) < 0) {
|
| 480 |
|
|
/* failed, abort operation
|
| 481 |
|
|
*/
|
| 482 |
|
|
buff->bytes = buff->ptr - buff->address;
|
| 483 |
|
|
buff->status = error;
|
| 484 |
|
|
/* finish this buffer: */
|
| 485 |
|
|
(void)ftape_next_buffer(ft_queue_head);
|
| 486 |
|
|
ft_runner_status = aborting;
|
| 487 |
|
|
fdc_mode = fdc_idle;
|
| 488 |
|
|
}
|
| 489 |
|
|
} else {
|
| 490 |
|
|
/* current segment completed
|
| 491 |
|
|
*/
|
| 492 |
|
|
unsigned int last_segment = buff->segment_id;
|
| 493 |
|
|
int eot = ((last_segment + 1) % ft_segments_per_track) == 0;
|
| 494 |
|
|
unsigned int next = buff->next_segment; /* 0 means stop ! */
|
| 495 |
|
|
|
| 496 |
|
|
buff->bytes = buff->ptr - buff->address;
|
| 497 |
|
|
buff->status = done;
|
| 498 |
|
|
buff = ftape_next_buffer(ft_queue_head);
|
| 499 |
|
|
if (eot) {
|
| 500 |
|
|
/* finished last segment on current track,
|
| 501 |
|
|
* can't continue
|
| 502 |
|
|
*/
|
| 503 |
|
|
ft_runner_status = logical_eot;
|
| 504 |
|
|
fdc_mode = fdc_idle;
|
| 505 |
|
|
TRACE_EXIT;
|
| 506 |
|
|
}
|
| 507 |
|
|
if (next <= 0) {
|
| 508 |
|
|
/* don't continue with next segment
|
| 509 |
|
|
*/
|
| 510 |
|
|
TRACE(ft_t_noise, "no %s allowed, stopping tape",
|
| 511 |
|
|
(write) ? "write next" : "read ahead");
|
| 512 |
|
|
pause_tape(0, mode);
|
| 513 |
|
|
ft_runner_status = idle; /* not quite true until
|
| 514 |
|
|
* next irq
|
| 515 |
|
|
*/
|
| 516 |
|
|
TRACE_EXIT;
|
| 517 |
|
|
}
|
| 518 |
|
|
/* continue with next segment
|
| 519 |
|
|
*/
|
| 520 |
|
|
if (buff->status != waiting) {
|
| 521 |
|
|
TRACE(ft_t_noise, "all input buffers %s, pausing tape",
|
| 522 |
|
|
(write) ? "empty" : "full");
|
| 523 |
|
|
pause_tape(0, mode);
|
| 524 |
|
|
ft_runner_status = idle; /* not quite true until
|
| 525 |
|
|
* next irq
|
| 526 |
|
|
*/
|
| 527 |
|
|
TRACE_EXIT;
|
| 528 |
|
|
}
|
| 529 |
|
|
if (write && next != buff->segment_id) {
|
| 530 |
|
|
TRACE(ft_t_noise,
|
| 531 |
|
|
"segments out of order, aborting write");
|
| 532 |
|
|
ft_runner_status = do_abort;
|
| 533 |
|
|
fdc_mode = fdc_idle;
|
| 534 |
|
|
TRACE_EXIT;
|
| 535 |
|
|
}
|
| 536 |
|
|
ftape_setup_new_segment(buff, next, 0);
|
| 537 |
|
|
if (stop_read_ahead) {
|
| 538 |
|
|
buff->next_segment = 0;
|
| 539 |
|
|
stop_read_ahead = 0;
|
| 540 |
|
|
}
|
| 541 |
|
|
if (ftape_calc_next_cluster(buff) == 0 ||
|
| 542 |
|
|
fdc_setup_read_write(buff, mode) != 0) {
|
| 543 |
|
|
TRACE(ft_t_err, "couldn't start %s-ahead",
|
| 544 |
|
|
write ? "write" : "read");
|
| 545 |
|
|
ft_runner_status = do_abort;
|
| 546 |
|
|
fdc_mode = fdc_idle;
|
| 547 |
|
|
} else {
|
| 548 |
|
|
/* keep on going */
|
| 549 |
|
|
switch (ft_driver_state) {
|
| 550 |
|
|
case reading: buff->status = reading; break;
|
| 551 |
|
|
case verifying: buff->status = verifying; break;
|
| 552 |
|
|
case writing: buff->status = writing; break;
|
| 553 |
|
|
case deleting: buff->status = deleting; break;
|
| 554 |
|
|
default:
|
| 555 |
|
|
TRACE(ft_t_err,
|
| 556 |
|
|
"BUG: ft_driver_state %d should be one out of "
|
| 557 |
|
|
"{reading, writing, verifying, deleting}",
|
| 558 |
|
|
ft_driver_state);
|
| 559 |
|
|
buff->status = write ? writing : reading;
|
| 560 |
|
|
break;
|
| 561 |
|
|
}
|
| 562 |
|
|
}
|
| 563 |
|
|
}
|
| 564 |
|
|
TRACE_EXIT;
|
| 565 |
|
|
}
|
| 566 |
|
|
|
| 567 |
|
|
static void retry_sector(buffer_struct *buff,
|
| 568 |
|
|
int mode,
|
| 569 |
|
|
unsigned int skip)
|
| 570 |
|
|
{
|
| 571 |
|
|
TRACE_FUN(ft_t_any);
|
| 572 |
|
|
|
| 573 |
|
|
TRACE(ft_t_noise, "%s error, will retry",
|
| 574 |
|
|
(mode == fdc_writing_data || mode == fdc_deleting) ? "write" : "read");
|
| 575 |
|
|
pause_tape(1, mode);
|
| 576 |
|
|
ft_runner_status = aborting;
|
| 577 |
|
|
buff->status = error;
|
| 578 |
|
|
buff->skip = skip;
|
| 579 |
|
|
TRACE_EXIT;
|
| 580 |
|
|
}
|
| 581 |
|
|
|
| 582 |
|
|
static unsigned int find_resume_point(buffer_struct *buff)
|
| 583 |
|
|
{
|
| 584 |
|
|
int i = 0;
|
| 585 |
|
|
SectorMap mask;
|
| 586 |
|
|
SectorMap map;
|
| 587 |
|
|
TRACE_FUN(ft_t_any);
|
| 588 |
|
|
|
| 589 |
|
|
/* This function is to be called after all variables have been
|
| 590 |
|
|
* updated to point past the failing sector.
|
| 591 |
|
|
* If there are any soft errors before the failing sector,
|
| 592 |
|
|
* find the first soft error and return the sector offset.
|
| 593 |
|
|
* Otherwise find the last hard error.
|
| 594 |
|
|
* Note: there should always be at least one hard or soft error !
|
| 595 |
|
|
*/
|
| 596 |
|
|
if (buff->sector_offset < 1 || buff->sector_offset > 32) {
|
| 597 |
|
|
TRACE(ft_t_bug, "BUG: sector_offset = %d",
|
| 598 |
|
|
buff->sector_offset);
|
| 599 |
|
|
TRACE_EXIT 0;
|
| 600 |
|
|
}
|
| 601 |
|
|
if (buff->sector_offset >= 32) { /* C-limitation on shift ! */
|
| 602 |
|
|
mask = 0xffffffff;
|
| 603 |
|
|
} else {
|
| 604 |
|
|
mask = (1 << buff->sector_offset) - 1;
|
| 605 |
|
|
}
|
| 606 |
|
|
map = buff->soft_error_map & mask;
|
| 607 |
|
|
if (map) {
|
| 608 |
|
|
while ((map & (1 << i)) == 0) {
|
| 609 |
|
|
++i;
|
| 610 |
|
|
}
|
| 611 |
|
|
TRACE(ft_t_noise, "at sector %d", FT_SECTOR(i));
|
| 612 |
|
|
} else {
|
| 613 |
|
|
map = buff->hard_error_map & mask;
|
| 614 |
|
|
i = buff->sector_offset - 1;
|
| 615 |
|
|
if (map) {
|
| 616 |
|
|
while ((map & (1 << i)) == 0) {
|
| 617 |
|
|
--i;
|
| 618 |
|
|
}
|
| 619 |
|
|
TRACE(ft_t_noise, "after sector %d", FT_SECTOR(i));
|
| 620 |
|
|
++i; /* first sector after last hard error */
|
| 621 |
|
|
} else {
|
| 622 |
|
|
TRACE(ft_t_bug, "BUG: no soft or hard errors");
|
| 623 |
|
|
}
|
| 624 |
|
|
}
|
| 625 |
|
|
TRACE_EXIT i;
|
| 626 |
|
|
}
|
| 627 |
|
|
|
| 628 |
|
|
/* check possible dma residue when formatting, update position record in
|
| 629 |
|
|
* buffer struct. This is, of course, modelled after determine_progress(), but
|
| 630 |
|
|
* we don't need to set up for retries because the format process cannot be
|
| 631 |
|
|
* interrupted (except at the end of the tape track).
|
| 632 |
|
|
*/
|
| 633 |
|
|
static int determine_fmt_progress(buffer_struct *buff, error_cause cause)
|
| 634 |
|
|
{
|
| 635 |
|
|
unsigned int dma_residue;
|
| 636 |
|
|
TRACE_FUN(ft_t_any);
|
| 637 |
|
|
|
| 638 |
|
|
/* Using less preferred order of disable_dma and
|
| 639 |
|
|
* get_dma_residue because this seems to fail on at least one
|
| 640 |
|
|
* system if reversed!
|
| 641 |
|
|
*/
|
| 642 |
|
|
dma_residue = get_dma_residue(fdc.dma);
|
| 643 |
|
|
disable_dma(fdc.dma);
|
| 644 |
|
|
if (cause != no_error || dma_residue != 0) {
|
| 645 |
|
|
TRACE(ft_t_info, "DMA residue = 0x%04x", dma_residue);
|
| 646 |
|
|
fdc_mode = fdc_idle;
|
| 647 |
|
|
switch(cause) {
|
| 648 |
|
|
case no_error:
|
| 649 |
|
|
ft_runner_status = aborting;
|
| 650 |
|
|
buff->status = idle;
|
| 651 |
|
|
break;
|
| 652 |
|
|
case overrun_error:
|
| 653 |
|
|
/* got an overrun error on the first byte, must be a
|
| 654 |
|
|
* hardware problem
|
| 655 |
|
|
*/
|
| 656 |
|
|
TRACE(ft_t_bug,
|
| 657 |
|
|
"Unexpected error: failing DMA controller ?");
|
| 658 |
|
|
ft_runner_status = do_abort;
|
| 659 |
|
|
buff->status = error;
|
| 660 |
|
|
break;
|
| 661 |
|
|
default:
|
| 662 |
|
|
TRACE(ft_t_noise, "Unexpected error at segment %d",
|
| 663 |
|
|
buff->segment_id);
|
| 664 |
|
|
ft_runner_status = do_abort;
|
| 665 |
|
|
buff->status = error;
|
| 666 |
|
|
break;
|
| 667 |
|
|
}
|
| 668 |
|
|
TRACE_EXIT -EIO; /* can only retry entire track in format mode
|
| 669 |
|
|
*/
|
| 670 |
|
|
}
|
| 671 |
|
|
/* Update var's influenced by the DMA operation.
|
| 672 |
|
|
*/
|
| 673 |
|
|
buff->ptr += FT_SECTORS_PER_SEGMENT * 4;
|
| 674 |
|
|
buff->bytes -= FT_SECTORS_PER_SEGMENT * 4;
|
| 675 |
|
|
buff->remaining -= FT_SECTORS_PER_SEGMENT;
|
| 676 |
|
|
buff->segment_id ++; /* done with segment */
|
| 677 |
|
|
TRACE_EXIT 0;
|
| 678 |
|
|
}
|
| 679 |
|
|
|
| 680 |
|
|
/*
|
| 681 |
|
|
* Continue formatting, switch buffers if there is no data left in
|
| 682 |
|
|
* current buffer. This is, of course, modelled after
|
| 683 |
|
|
* continue_xfer(), but we don't need to set up for retries because
|
| 684 |
|
|
* the format process cannot be interrupted (except at the end of the
|
| 685 |
|
|
* tape track).
|
| 686 |
|
|
*/
|
| 687 |
|
|
static void continue_formatting(buffer_struct *buff)
|
| 688 |
|
|
{
|
| 689 |
|
|
TRACE_FUN(ft_t_any);
|
| 690 |
|
|
|
| 691 |
|
|
if (buff->remaining <= 0) { /* no space left in dma buffer */
|
| 692 |
|
|
unsigned int next = buff->next_segment;
|
| 693 |
|
|
|
| 694 |
|
|
if (next == 0) { /* end of tape track */
|
| 695 |
|
|
buff->status = done;
|
| 696 |
|
|
ft_runner_status = logical_eot;
|
| 697 |
|
|
fdc_mode = fdc_idle;
|
| 698 |
|
|
TRACE(ft_t_noise, "Done formatting track %d",
|
| 699 |
|
|
ft_location.track);
|
| 700 |
|
|
TRACE_EXIT;
|
| 701 |
|
|
}
|
| 702 |
|
|
/*
|
| 703 |
|
|
* switch to next buffer!
|
| 704 |
|
|
*/
|
| 705 |
|
|
buff->status = done;
|
| 706 |
|
|
buff = ftape_next_buffer(ft_queue_head);
|
| 707 |
|
|
|
| 708 |
|
|
if (buff->status != waiting || next != buff->segment_id) {
|
| 709 |
|
|
goto format_setup_error;
|
| 710 |
|
|
}
|
| 711 |
|
|
}
|
| 712 |
|
|
if (fdc_setup_formatting(buff) < 0) {
|
| 713 |
|
|
goto format_setup_error;
|
| 714 |
|
|
}
|
| 715 |
|
|
buff->status = formatting;
|
| 716 |
|
|
TRACE(ft_t_fdc_dma, "Formatting segment %d on track %d",
|
| 717 |
|
|
buff->segment_id, ft_location.track);
|
| 718 |
|
|
TRACE_EXIT;
|
| 719 |
|
|
format_setup_error:
|
| 720 |
|
|
ft_runner_status = do_abort;
|
| 721 |
|
|
fdc_mode = fdc_idle;
|
| 722 |
|
|
buff->status = error;
|
| 723 |
|
|
TRACE(ft_t_err, "Error setting up for segment %d on track %d",
|
| 724 |
|
|
buff->segment_id, ft_location.track);
|
| 725 |
|
|
TRACE_EXIT;
|
| 726 |
|
|
|
| 727 |
|
|
}
|
| 728 |
|
|
|
| 729 |
|
|
/* this handles writing, read id, reading and formatting
|
| 730 |
|
|
*/
|
| 731 |
|
|
static void handle_fdc_busy(buffer_struct *buff)
|
| 732 |
|
|
{
|
| 733 |
|
|
static int no_data_error_count;
|
| 734 |
|
|
int retry = 0;
|
| 735 |
|
|
error_cause cause;
|
| 736 |
|
|
__u8 in[7];
|
| 737 |
|
|
int skip;
|
| 738 |
|
|
fdc_mode_enum fmode = fdc_mode;
|
| 739 |
|
|
TRACE_FUN(ft_t_any);
|
| 740 |
|
|
|
| 741 |
|
|
if (fdc_result(in, 7) < 0) { /* better get it fast ! */
|
| 742 |
|
|
TRACE(ft_t_err,
|
| 743 |
|
|
"Probably fatal error during FDC Result Phase\n"
|
| 744 |
|
|
KERN_INFO
|
| 745 |
|
|
"drive may hang until (power on) reset :-(");
|
| 746 |
|
|
/* what to do next ????
|
| 747 |
|
|
*/
|
| 748 |
|
|
TRACE_EXIT;
|
| 749 |
|
|
}
|
| 750 |
|
|
cause = decode_irq_cause(fdc_mode, in);
|
| 751 |
|
|
#ifdef TESTING
|
| 752 |
|
|
{ int i;
|
| 753 |
|
|
for (i = 0; i < (int)ft_nr_buffers; ++i)
|
| 754 |
|
|
TRACE(ft_t_any, "buffer[%d] status: %d, segment_id: %d",
|
| 755 |
|
|
i, ft_buffer[i]->status, ft_buffer[i]->segment_id);
|
| 756 |
|
|
}
|
| 757 |
|
|
#endif
|
| 758 |
|
|
if (fmode == fdc_reading_data && ft_driver_state == verifying) {
|
| 759 |
|
|
fmode = fdc_verifying;
|
| 760 |
|
|
}
|
| 761 |
|
|
switch (fmode) {
|
| 762 |
|
|
case fdc_verifying:
|
| 763 |
|
|
if (ft_runner_status == aborting ||
|
| 764 |
|
|
ft_runner_status == do_abort) {
|
| 765 |
|
|
TRACE(ft_t_noise,"aborting %s",fdc_mode_txt(fdc_mode));
|
| 766 |
|
|
break;
|
| 767 |
|
|
}
|
| 768 |
|
|
if (buff->retry > 0) {
|
| 769 |
|
|
TRACE(ft_t_flow, "this is retry nr %d", buff->retry);
|
| 770 |
|
|
}
|
| 771 |
|
|
switch (cause) {
|
| 772 |
|
|
case no_error:
|
| 773 |
|
|
no_data_error_count = 0;
|
| 774 |
|
|
determine_verify_progress(buff, cause, in[5]);
|
| 775 |
|
|
if (in[2] & 0x40) {
|
| 776 |
|
|
/* This should not happen when verifying
|
| 777 |
|
|
*/
|
| 778 |
|
|
TRACE(ft_t_warn,
|
| 779 |
|
|
"deleted data in segment %d/%d",
|
| 780 |
|
|
buff->segment_id,
|
| 781 |
|
|
FT_SECTOR(buff->sector_offset - 1));
|
| 782 |
|
|
buff->remaining = 0; /* abort transfer */
|
| 783 |
|
|
buff->hard_error_map = EMPTY_SEGMENT;
|
| 784 |
|
|
skip = 1;
|
| 785 |
|
|
} else {
|
| 786 |
|
|
skip = 0;
|
| 787 |
|
|
}
|
| 788 |
|
|
continue_xfer(buff, fdc_mode, skip);
|
| 789 |
|
|
break;
|
| 790 |
|
|
case no_data_error:
|
| 791 |
|
|
no_data_error_count ++;
|
| 792 |
|
|
case overrun_error:
|
| 793 |
|
|
retry ++;
|
| 794 |
|
|
case id_am_error:
|
| 795 |
|
|
case id_crc_error:
|
| 796 |
|
|
case data_am_error:
|
| 797 |
|
|
case data_crc_error:
|
| 798 |
|
|
determine_verify_progress(buff, cause, in[5]);
|
| 799 |
|
|
if (cause == no_data_error) {
|
| 800 |
|
|
if (no_data_error_count >= 2) {
|
| 801 |
|
|
TRACE(ft_t_warn,
|
| 802 |
|
|
"retrying because of successive "
|
| 803 |
|
|
"no data errors");
|
| 804 |
|
|
no_data_error_count = 0;
|
| 805 |
|
|
} else {
|
| 806 |
|
|
retry --;
|
| 807 |
|
|
}
|
| 808 |
|
|
} else {
|
| 809 |
|
|
no_data_error_count = 0;
|
| 810 |
|
|
}
|
| 811 |
|
|
if (retry) {
|
| 812 |
|
|
skip = find_resume_point(buff);
|
| 813 |
|
|
} else {
|
| 814 |
|
|
skip = buff->sector_offset;
|
| 815 |
|
|
}
|
| 816 |
|
|
if (retry && skip < 32) {
|
| 817 |
|
|
retry_sector(buff, fdc_mode, skip);
|
| 818 |
|
|
} else {
|
| 819 |
|
|
continue_xfer(buff, fdc_mode, skip);
|
| 820 |
|
|
}
|
| 821 |
|
|
update_history(cause);
|
| 822 |
|
|
break;
|
| 823 |
|
|
default:
|
| 824 |
|
|
/* Don't know why this could happen
|
| 825 |
|
|
* but find out.
|
| 826 |
|
|
*/
|
| 827 |
|
|
determine_verify_progress(buff, cause, in[5]);
|
| 828 |
|
|
retry_sector(buff, fdc_mode, 0);
|
| 829 |
|
|
TRACE(ft_t_err, "Error: unexpected error");
|
| 830 |
|
|
break;
|
| 831 |
|
|
}
|
| 832 |
|
|
break;
|
| 833 |
|
|
case fdc_reading_data:
|
| 834 |
|
|
#ifdef TESTING
|
| 835 |
|
|
/* I'm sorry, but: NOBODY ever used this trace
|
| 836 |
|
|
* messages for ages. I guess that Bas was the last person
|
| 837 |
|
|
* that ever really used this (thank you, between the lines)
|
| 838 |
|
|
*/
|
| 839 |
|
|
if (cause == no_error) {
|
| 840 |
|
|
TRACE(ft_t_flow,"reading segment %d",buff->segment_id);
|
| 841 |
|
|
} else {
|
| 842 |
|
|
TRACE(ft_t_noise, "error reading segment %d",
|
| 843 |
|
|
buff->segment_id);
|
| 844 |
|
|
TRACE(ft_t_noise, "\n"
|
| 845 |
|
|
KERN_INFO
|
| 846 |
|
|
"IRQ:C: 0x%02x, H: 0x%02x, R: 0x%02x, N: 0x%02x\n"
|
| 847 |
|
|
KERN_INFO
|
| 848 |
|
|
"BUF:C: 0x%02x, H: 0x%02x, R: 0x%02x",
|
| 849 |
|
|
in[3], in[4], in[5], in[6],
|
| 850 |
|
|
buff->cyl, buff->head, buff->sect);
|
| 851 |
|
|
}
|
| 852 |
|
|
#endif
|
| 853 |
|
|
if (ft_runner_status == aborting ||
|
| 854 |
|
|
ft_runner_status == do_abort) {
|
| 855 |
|
|
TRACE(ft_t_noise,"aborting %s",fdc_mode_txt(fdc_mode));
|
| 856 |
|
|
break;
|
| 857 |
|
|
}
|
| 858 |
|
|
if (buff->bad_sector_map == FAKE_SEGMENT) {
|
| 859 |
|
|
/* This condition occurs when reading a `fake'
|
| 860 |
|
|
* sector that's not accessible. Doesn't
|
| 861 |
|
|
* really matter as we would have ignored it
|
| 862 |
|
|
* anyway !
|
| 863 |
|
|
*
|
| 864 |
|
|
* Chance is that we're past the next segment
|
| 865 |
|
|
* now, so the next operation may fail and
|
| 866 |
|
|
* result in a retry.
|
| 867 |
|
|
*/
|
| 868 |
|
|
buff->remaining = 0; /* skip failing sector */
|
| 869 |
|
|
/* buff->ptr = buff->address; */
|
| 870 |
|
|
/* fake success: */
|
| 871 |
|
|
continue_xfer(buff, fdc_mode, 1);
|
| 872 |
|
|
/* trace calls are expensive: place them AFTER
|
| 873 |
|
|
* the real stuff has been done.
|
| 874 |
|
|
*
|
| 875 |
|
|
*/
|
| 876 |
|
|
TRACE(ft_t_noise, "skipping empty segment %d (read), size? %d",
|
| 877 |
|
|
buff->segment_id, buff->ptr - buff->address);
|
| 878 |
|
|
TRACE_EXIT;
|
| 879 |
|
|
}
|
| 880 |
|
|
if (buff->retry > 0) {
|
| 881 |
|
|
TRACE(ft_t_flow, "this is retry nr %d", buff->retry);
|
| 882 |
|
|
}
|
| 883 |
|
|
switch (cause) {
|
| 884 |
|
|
case no_error:
|
| 885 |
|
|
determine_progress(buff, cause, in[5]);
|
| 886 |
|
|
if (in[2] & 0x40) {
|
| 887 |
|
|
/* Handle deleted data in header segments.
|
| 888 |
|
|
* Skip segment and force read-ahead.
|
| 889 |
|
|
*/
|
| 890 |
|
|
TRACE(ft_t_warn,
|
| 891 |
|
|
"deleted data in segment %d/%d",
|
| 892 |
|
|
buff->segment_id,
|
| 893 |
|
|
FT_SECTOR(buff->sector_offset - 1));
|
| 894 |
|
|
buff->deleted = 1;
|
| 895 |
|
|
buff->remaining = 0;/*abort transfer */
|
| 896 |
|
|
buff->soft_error_map |=
|
| 897 |
|
|
(-1L << buff->sector_offset);
|
| 898 |
|
|
if (buff->segment_id == 0) {
|
| 899 |
|
|
/* stop on next segment */
|
| 900 |
|
|
stop_read_ahead = 1;
|
| 901 |
|
|
}
|
| 902 |
|
|
/* force read-ahead: */
|
| 903 |
|
|
buff->next_segment =
|
| 904 |
|
|
buff->segment_id + 1;
|
| 905 |
|
|
skip = (FT_SECTORS_PER_SEGMENT -
|
| 906 |
|
|
buff->sector_offset);
|
| 907 |
|
|
} else {
|
| 908 |
|
|
skip = 0;
|
| 909 |
|
|
}
|
| 910 |
|
|
continue_xfer(buff, fdc_mode, skip);
|
| 911 |
|
|
break;
|
| 912 |
|
|
case no_data_error:
|
| 913 |
|
|
/* Tape started too far ahead of or behind the
|
| 914 |
|
|
* right sector. This may also happen in the
|
| 915 |
|
|
* middle of a segment !
|
| 916 |
|
|
*
|
| 917 |
|
|
* Handle no-data as soft error. If next
|
| 918 |
|
|
* sector fails too, a retry (with needed
|
| 919 |
|
|
* reposition) will follow.
|
| 920 |
|
|
*/
|
| 921 |
|
|
retry ++;
|
| 922 |
|
|
case id_am_error:
|
| 923 |
|
|
case id_crc_error:
|
| 924 |
|
|
case data_am_error:
|
| 925 |
|
|
case data_crc_error:
|
| 926 |
|
|
case overrun_error:
|
| 927 |
|
|
retry += (buff->soft_error_map != 0 ||
|
| 928 |
|
|
buff->hard_error_map != 0);
|
| 929 |
|
|
determine_progress(buff, cause, in[5]);
|
| 930 |
|
|
#if 1 || defined(TESTING)
|
| 931 |
|
|
if (cause == overrun_error) retry ++;
|
| 932 |
|
|
#endif
|
| 933 |
|
|
if (retry) {
|
| 934 |
|
|
skip = find_resume_point(buff);
|
| 935 |
|
|
} else {
|
| 936 |
|
|
skip = buff->sector_offset;
|
| 937 |
|
|
}
|
| 938 |
|
|
/* Try to resume with next sector on single
|
| 939 |
|
|
* errors (let ecc correct it), but retry on
|
| 940 |
|
|
* no_data (we'll be past the target when we
|
| 941 |
|
|
* get here so we cannot retry) or on
|
| 942 |
|
|
* multiple errors (reduce chance on ecc
|
| 943 |
|
|
* failure).
|
| 944 |
|
|
*/
|
| 945 |
|
|
/* cH: 23/02/97: if the last sector in the
|
| 946 |
|
|
* segment was a hard error, then there is
|
| 947 |
|
|
* no sense in a retry. This occasion seldom
|
| 948 |
|
|
* occurs but ... @:³²¸`@%&§$
|
| 949 |
|
|
*/
|
| 950 |
|
|
if (retry && skip < 32) {
|
| 951 |
|
|
retry_sector(buff, fdc_mode, skip);
|
| 952 |
|
|
} else {
|
| 953 |
|
|
continue_xfer(buff, fdc_mode, skip);
|
| 954 |
|
|
}
|
| 955 |
|
|
update_history(cause);
|
| 956 |
|
|
break;
|
| 957 |
|
|
default:
|
| 958 |
|
|
/* Don't know why this could happen
|
| 959 |
|
|
* but find out.
|
| 960 |
|
|
*/
|
| 961 |
|
|
determine_progress(buff, cause, in[5]);
|
| 962 |
|
|
retry_sector(buff, fdc_mode, 0);
|
| 963 |
|
|
TRACE(ft_t_err, "Error: unexpected error");
|
| 964 |
|
|
break;
|
| 965 |
|
|
}
|
| 966 |
|
|
break;
|
| 967 |
|
|
case fdc_reading_id:
|
| 968 |
|
|
if (cause == no_error) {
|
| 969 |
|
|
fdc_cyl = in[3];
|
| 970 |
|
|
fdc_head = in[4];
|
| 971 |
|
|
fdc_sect = in[5];
|
| 972 |
|
|
TRACE(ft_t_fdc_dma,
|
| 973 |
|
|
"id read: C: 0x%02x, H: 0x%02x, R: 0x%02x",
|
| 974 |
|
|
fdc_cyl, fdc_head, fdc_sect);
|
| 975 |
|
|
} else { /* no valid information, use invalid sector */
|
| 976 |
|
|
fdc_cyl = fdc_head = fdc_sect = 0;
|
| 977 |
|
|
TRACE(ft_t_flow, "Didn't find valid sector Id");
|
| 978 |
|
|
}
|
| 979 |
|
|
fdc_mode = fdc_idle;
|
| 980 |
|
|
break;
|
| 981 |
|
|
case fdc_deleting:
|
| 982 |
|
|
case fdc_writing_data:
|
| 983 |
|
|
#ifdef TESTING
|
| 984 |
|
|
if (cause == no_error) {
|
| 985 |
|
|
TRACE(ft_t_flow, "writing segment %d", buff->segment_id);
|
| 986 |
|
|
} else {
|
| 987 |
|
|
TRACE(ft_t_noise, "error writing segment %d",
|
| 988 |
|
|
buff->segment_id);
|
| 989 |
|
|
}
|
| 990 |
|
|
#endif
|
| 991 |
|
|
if (ft_runner_status == aborting ||
|
| 992 |
|
|
ft_runner_status == do_abort) {
|
| 993 |
|
|
TRACE(ft_t_flow, "aborting %s",fdc_mode_txt(fdc_mode));
|
| 994 |
|
|
break;
|
| 995 |
|
|
}
|
| 996 |
|
|
if (buff->retry > 0) {
|
| 997 |
|
|
TRACE(ft_t_flow, "this is retry nr %d", buff->retry);
|
| 998 |
|
|
}
|
| 999 |
|
|
if (buff->bad_sector_map == FAKE_SEGMENT) {
|
| 1000 |
|
|
/* This condition occurs when trying to write to a
|
| 1001 |
|
|
* `fake' sector that's not accessible. Doesn't really
|
| 1002 |
|
|
* matter as it isn't used anyway ! Might be located
|
| 1003 |
|
|
* at wrong segment, then we'll fail on the next
|
| 1004 |
|
|
* segment.
|
| 1005 |
|
|
*/
|
| 1006 |
|
|
TRACE(ft_t_noise, "skipping empty segment (write)");
|
| 1007 |
|
|
buff->remaining = 0; /* skip failing sector */
|
| 1008 |
|
|
/* fake success: */
|
| 1009 |
|
|
continue_xfer(buff, fdc_mode, 1);
|
| 1010 |
|
|
break;
|
| 1011 |
|
|
}
|
| 1012 |
|
|
switch (cause) {
|
| 1013 |
|
|
case no_error:
|
| 1014 |
|
|
determine_progress(buff, cause, in[5]);
|
| 1015 |
|
|
continue_xfer(buff, fdc_mode, 0);
|
| 1016 |
|
|
break;
|
| 1017 |
|
|
case no_data_error:
|
| 1018 |
|
|
case id_am_error:
|
| 1019 |
|
|
case id_crc_error:
|
| 1020 |
|
|
case data_am_error:
|
| 1021 |
|
|
case overrun_error:
|
| 1022 |
|
|
update_history(cause);
|
| 1023 |
|
|
determine_progress(buff, cause, in[5]);
|
| 1024 |
|
|
skip = find_resume_point(buff);
|
| 1025 |
|
|
retry_sector(buff, fdc_mode, skip);
|
| 1026 |
|
|
break;
|
| 1027 |
|
|
default:
|
| 1028 |
|
|
if (in[1] & 0x02) {
|
| 1029 |
|
|
TRACE(ft_t_err, "media not writable");
|
| 1030 |
|
|
} else {
|
| 1031 |
|
|
TRACE(ft_t_bug, "unforeseen write error");
|
| 1032 |
|
|
}
|
| 1033 |
|
|
fdc_mode = fdc_idle;
|
| 1034 |
|
|
break;
|
| 1035 |
|
|
}
|
| 1036 |
|
|
break; /* fdc_deleting || fdc_writing_data */
|
| 1037 |
|
|
case fdc_formatting:
|
| 1038 |
|
|
/* The interrupt comes after formatting a segment. We then
|
| 1039 |
|
|
* have to set up QUICKLY for the next segment. But
|
| 1040 |
|
|
* afterwards, there is plenty of time.
|
| 1041 |
|
|
*/
|
| 1042 |
|
|
switch (cause) {
|
| 1043 |
|
|
case no_error:
|
| 1044 |
|
|
/* would like to keep most of the formatting stuff
|
| 1045 |
|
|
* outside the isr code, but timing is too critical
|
| 1046 |
|
|
*/
|
| 1047 |
|
|
if (determine_fmt_progress(buff, cause) >= 0) {
|
| 1048 |
|
|
continue_formatting(buff);
|
| 1049 |
|
|
}
|
| 1050 |
|
|
break;
|
| 1051 |
|
|
case no_data_error:
|
| 1052 |
|
|
case id_am_error:
|
| 1053 |
|
|
case id_crc_error:
|
| 1054 |
|
|
case data_am_error:
|
| 1055 |
|
|
case overrun_error:
|
| 1056 |
|
|
default:
|
| 1057 |
|
|
determine_fmt_progress(buff, cause);
|
| 1058 |
|
|
update_history(cause);
|
| 1059 |
|
|
if (in[1] & 0x02) {
|
| 1060 |
|
|
TRACE(ft_t_err, "media not writable");
|
| 1061 |
|
|
} else {
|
| 1062 |
|
|
TRACE(ft_t_bug, "unforeseen write error");
|
| 1063 |
|
|
}
|
| 1064 |
|
|
break;
|
| 1065 |
|
|
} /* cause */
|
| 1066 |
|
|
break;
|
| 1067 |
|
|
default:
|
| 1068 |
|
|
TRACE(ft_t_warn, "Warning: unexpected irq during: %s",
|
| 1069 |
|
|
fdc_mode_txt(fdc_mode));
|
| 1070 |
|
|
fdc_mode = fdc_idle;
|
| 1071 |
|
|
break;
|
| 1072 |
|
|
}
|
| 1073 |
|
|
TRACE_EXIT;
|
| 1074 |
|
|
}
|
| 1075 |
|
|
|
| 1076 |
|
|
/* FDC interrupt service routine.
|
| 1077 |
|
|
*/
|
| 1078 |
|
|
void fdc_isr(void)
|
| 1079 |
|
|
{
|
| 1080 |
|
|
static int isr_active;
|
| 1081 |
|
|
#ifdef TESTING
|
| 1082 |
|
|
unsigned int t0 = ftape_timestamp();
|
| 1083 |
|
|
#endif
|
| 1084 |
|
|
TRACE_FUN(ft_t_any);
|
| 1085 |
|
|
|
| 1086 |
|
|
if (isr_active++) {
|
| 1087 |
|
|
--isr_active;
|
| 1088 |
|
|
TRACE(ft_t_bug, "BUG: nested interrupt, not good !");
|
| 1089 |
|
|
*fdc.hook = fdc_isr; /* hook our handler into the fdc
|
| 1090 |
|
|
* code again
|
| 1091 |
|
|
*/
|
| 1092 |
|
|
TRACE_EXIT;
|
| 1093 |
|
|
}
|
| 1094 |
|
|
sti();
|
| 1095 |
|
|
if (inb_p(fdc.msr) & FDC_BUSY) { /* Entering Result Phase */
|
| 1096 |
|
|
ft_hide_interrupt = 0;
|
| 1097 |
|
|
handle_fdc_busy(ftape_get_buffer(ft_queue_head));
|
| 1098 |
|
|
if (ft_runner_status == do_abort) {
|
| 1099 |
|
|
/* cease operation, remember tape position
|
| 1100 |
|
|
*/
|
| 1101 |
|
|
TRACE(ft_t_flow, "runner aborting");
|
| 1102 |
|
|
ft_runner_status = aborting;
|
| 1103 |
|
|
++ft_expected_stray_interrupts;
|
| 1104 |
|
|
}
|
| 1105 |
|
|
} else { /* !FDC_BUSY */
|
| 1106 |
|
|
/* clear interrupt, cause should be gotten by issuing
|
| 1107 |
|
|
* a Sense Interrupt Status command.
|
| 1108 |
|
|
*/
|
| 1109 |
|
|
if (fdc_mode == fdc_recalibrating || fdc_mode == fdc_seeking) {
|
| 1110 |
|
|
if (ft_hide_interrupt) {
|
| 1111 |
|
|
int st0;
|
| 1112 |
|
|
int pcn;
|
| 1113 |
|
|
|
| 1114 |
|
|
if (fdc_sense_interrupt_status(&st0, &pcn) < 0)
|
| 1115 |
|
|
TRACE(ft_t_err,
|
| 1116 |
|
|
"sense interrupt status failed");
|
| 1117 |
|
|
ftape_current_cylinder = pcn;
|
| 1118 |
|
|
TRACE(ft_t_flow, "handled hidden interrupt");
|
| 1119 |
|
|
}
|
| 1120 |
|
|
ft_seek_completed = 1;
|
| 1121 |
|
|
fdc_mode = fdc_idle;
|
| 1122 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VER(2,0,16)
|
| 1123 |
|
|
} else if (!waitqueue_active(&ftape_wait_intr)) {
|
| 1124 |
|
|
#else
|
| 1125 |
|
|
} else if (!ftape_wait_intr) {
|
| 1126 |
|
|
#endif
|
| 1127 |
|
|
if (ft_expected_stray_interrupts == 0) {
|
| 1128 |
|
|
TRACE(ft_t_warn, "unexpected stray interrupt");
|
| 1129 |
|
|
} else {
|
| 1130 |
|
|
TRACE(ft_t_flow, "expected stray interrupt");
|
| 1131 |
|
|
--ft_expected_stray_interrupts;
|
| 1132 |
|
|
}
|
| 1133 |
|
|
} else {
|
| 1134 |
|
|
if (fdc_mode == fdc_reading_data ||
|
| 1135 |
|
|
fdc_mode == fdc_verifying ||
|
| 1136 |
|
|
fdc_mode == fdc_writing_data ||
|
| 1137 |
|
|
fdc_mode == fdc_deleting ||
|
| 1138 |
|
|
fdc_mode == fdc_formatting ||
|
| 1139 |
|
|
fdc_mode == fdc_reading_id) {
|
| 1140 |
|
|
if (inb_p(fdc.msr) & FDC_BUSY) {
|
| 1141 |
|
|
TRACE(ft_t_bug,
|
| 1142 |
|
|
"***** FDC failure, busy too late");
|
| 1143 |
|
|
} else {
|
| 1144 |
|
|
TRACE(ft_t_bug,
|
| 1145 |
|
|
"***** FDC failure, no busy");
|
| 1146 |
|
|
}
|
| 1147 |
|
|
} else {
|
| 1148 |
|
|
TRACE(ft_t_fdc_dma, "awaited stray interrupt");
|
| 1149 |
|
|
}
|
| 1150 |
|
|
}
|
| 1151 |
|
|
ft_hide_interrupt = 0;
|
| 1152 |
|
|
}
|
| 1153 |
|
|
/* Handle sleep code.
|
| 1154 |
|
|
*/
|
| 1155 |
|
|
if (!ft_hide_interrupt) {
|
| 1156 |
|
|
ft_interrupt_seen ++;
|
| 1157 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VER(2,0,16)
|
| 1158 |
|
|
if (waitqueue_active(&ftape_wait_intr)) {
|
| 1159 |
|
|
wake_up_interruptible(&ftape_wait_intr);
|
| 1160 |
|
|
}
|
| 1161 |
|
|
#else
|
| 1162 |
|
|
if (ftape_wait_intr) {
|
| 1163 |
|
|
wake_up_interruptible(&ftape_wait_intr);
|
| 1164 |
|
|
}
|
| 1165 |
|
|
#endif
|
| 1166 |
|
|
} else {
|
| 1167 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VER(2,0,16)
|
| 1168 |
|
|
TRACE(ft_t_flow, "hiding interrupt while %s",
|
| 1169 |
|
|
waitqueue_active(&ftape_wait_intr) ? "waiting":"active");
|
| 1170 |
|
|
#else
|
| 1171 |
|
|
TRACE(ft_t_flow, "hiding interrupt while %s",
|
| 1172 |
|
|
ftape_wait_intr ? "waiting" : "active");
|
| 1173 |
|
|
#endif
|
| 1174 |
|
|
}
|
| 1175 |
|
|
#ifdef TESTING
|
| 1176 |
|
|
t0 = ftape_timediff(t0, ftape_timestamp());
|
| 1177 |
|
|
if (t0 >= 1000) {
|
| 1178 |
|
|
/* only tell us about long calls */
|
| 1179 |
|
|
TRACE(ft_t_noise, "isr() duration: %5d usec", t0);
|
| 1180 |
|
|
}
|
| 1181 |
|
|
#endif
|
| 1182 |
|
|
*fdc.hook = fdc_isr; /* hook our handler into the fdc code again */
|
| 1183 |
|
|
--isr_active;
|
| 1184 |
|
|
TRACE_EXIT;
|
| 1185 |
|
|
}
|
