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/* |
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* scsi_linux.cpp - SCSI Manager, Linux specific stuff |
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* |
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* Basilisk II (C) 1997-2001 Christian Bauer |
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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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|
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#include "sysdeps.h" |
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|
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#include <sys/ioctl.h> |
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#include <linux/param.h> |
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#include <linux/../scsi/sg.h> // workaround for broken RedHat 6.0 /usr/include/scsi |
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#include <unistd.h> |
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#include <errno.h> |
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|
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#include "main.h" |
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#include "prefs.h" |
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#include "user_strings.h" |
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#include "scsi.h" |
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|
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#define DEBUG 0 |
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#include "debug.h" |
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|
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|
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// Global variables |
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static int fds[8]; // fd's for 8 units |
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static int fd; // Active fd (selected target) |
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|
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static uint32 buffer_size; // Size of data buffer |
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static uint8 *buffer = NULL; // Pointer to data buffer |
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|
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static uint8 the_cmd[12]; // Active SCSI command |
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static int the_cmd_len; |
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|
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|
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/* |
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* Initialization |
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*/ |
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|
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void SCSIInit(void) |
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{ |
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int id; |
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|
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// Allocate buffer |
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buffer = (uint8 *)malloc(buffer_size = 0x10000); |
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|
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// Open generic SCSI driver for all 8 units |
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for (id=0; id<8; id++) { |
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char prefs_name[16]; |
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sprintf(prefs_name, "scsi%d", id); |
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const char *str = PrefsFindString(prefs_name); |
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if (str) { |
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int fd = fds[id] = open(str, O_RDWR); |
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if (fd > 0) { |
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// Is it really a Generic SCSI device? |
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int timeout = ioctl(fd, SG_GET_TIMEOUT); |
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if (timeout < 0) { |
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// Error with SG_GET_TIMEOUT, doesn't seem to be a Generic SCSI device |
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char msg[256]; |
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sprintf(msg, GetString(STR_SCSI_DEVICE_NOT_SCSI_WARN), str); |
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WarningAlert(msg); |
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close(fd); |
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fds[id] = -1; |
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} else { |
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// Flush unwanted garbage from previous use of device |
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uint8 reply[256]; |
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int old_fl = fcntl(fd, F_GETFL); |
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fcntl(fd, F_SETFL, old_fl | O_NONBLOCK); |
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while (read(fd, reply, sizeof(reply)) != -1 || errno != EAGAIN) ; |
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fcntl(fd, F_SETFL, old_fl); |
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} |
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} else { |
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char msg[256]; |
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sprintf(msg, GetString(STR_SCSI_DEVICE_OPEN_WARN), str, strerror(errno)); |
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WarningAlert(msg); |
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} |
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} |
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} |
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|
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// Reset SCSI bus |
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SCSIReset(); |
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} |
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|
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|
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/* |
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* Deinitialization |
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*/ |
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|
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void SCSIExit(void) |
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{ |
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// Close all devices |
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for (int i=0; i<8; i++) { |
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int fd = fds[i]; |
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if (fd > 0) |
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close(fd); |
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} |
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|
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// Free buffer |
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if (buffer) { |
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free(buffer); |
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buffer = NULL; |
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} |
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} |
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|
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|
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/* |
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* Check if requested data size fits into buffer, allocate new buffer if needed |
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*/ |
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|
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static bool try_buffer(uint32 size) |
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{ |
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size += sizeof(struct sg_header) + 12; |
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if (size <= buffer_size) |
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return true; |
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|
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uint8 *new_buffer = (uint8 *)malloc(size); |
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if (new_buffer == NULL) |
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return false; |
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free(buffer); |
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buffer = new_buffer; |
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buffer_size = size; |
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return true; |
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} |
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|
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|
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/* |
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* Set SCSI command to be sent by scsi_send_cmd() |
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*/ |
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|
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void scsi_set_cmd(int cmd_length, uint8 *cmd) |
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{ |
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memcpy(the_cmd, cmd, the_cmd_len = cmd_length); |
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} |
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|
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|
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/* |
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* Check for presence of SCSI target |
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*/ |
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|
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bool scsi_is_target_present(int id) |
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{ |
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return fds[id] > 0; |
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} |
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|
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|
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/* |
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* Set SCSI target (returns false on error) |
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*/ |
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|
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bool scsi_set_target(int id, int lun) |
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{ |
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int new_fd = fds[id]; |
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if (new_fd < 0) |
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return false; |
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if (new_fd != fd) { |
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// Clear autosense data |
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struct sg_header *h = (struct sg_header *)buffer; |
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h->sense_buffer[2] = 0; |
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} |
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fd = new_fd; |
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return true; |
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} |
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|
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|
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/* |
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* Send SCSI command to active target (scsi_set_command() must have been called), |
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* read/write data according to S/G table (returns false on error); timeout is in 1/60 sec |
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*/ |
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|
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bool scsi_send_cmd(size_t data_length, bool reading, int sg_size, uint8 **sg_ptr, uint32 *sg_len, uint16 *stat, uint32 timeout) |
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{ |
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static int pack_id = 0; |
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|
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// Check if buffer is large enough, allocate new buffer if needed |
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if (!try_buffer(data_length)) { |
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char str[256]; |
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sprintf(str, GetString(STR_SCSI_BUFFER_ERR), data_length); |
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ErrorAlert(str); |
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return false; |
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} |
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|
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// Process S/G table when writing |
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if (!reading) { |
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D(bug(" writing to buffer\n")); |
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uint8 *buffer_ptr = buffer + sizeof(struct sg_header) + the_cmd_len; |
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for (int i=0; i<sg_size; i++) { |
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uint32 len = sg_len[i]; |
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D(bug(" %d bytes from %08lx\n", len, sg_ptr[i])); |
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memcpy(buffer_ptr, sg_ptr[i], len); |
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buffer_ptr += len; |
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} |
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} |
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|
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// Request Sense and autosense data valid? |
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struct sg_header *h = (struct sg_header *)buffer; |
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int res; |
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if (the_cmd[0] == 0x03 && (h->sense_buffer[2] & 0x0f)) { |
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|
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// Yes, fake command |
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D(bug(" autosense\n")); |
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memcpy(buffer + sizeof(struct sg_header), h->sense_buffer, 16); |
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res = 0; |
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*stat = 0; |
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|
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} else { |
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|
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// No, send regular command |
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int to = timeout * HZ / 60; |
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ioctl(fd, SG_SET_TIMEOUT, &to); |
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D(bug(" sending command, length %d\n", data_length)); |
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int request_size, reply_size; |
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if (reading) { |
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h->pack_len = request_size = sizeof(struct sg_header) + the_cmd_len; |
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h->reply_len = reply_size = sizeof(struct sg_header) + data_length; |
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} else { |
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h->pack_len = request_size = sizeof(struct sg_header) + the_cmd_len + data_length; |
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h->reply_len = reply_size = sizeof(struct sg_header); |
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} |
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h->pack_id = pack_id++; |
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h->result = 0; |
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h->twelve_byte = (the_cmd_len == 12); |
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h->sense_buffer[2] = 0; |
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memcpy(buffer + sizeof(struct sg_header), the_cmd, the_cmd_len); |
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res = write(fd, buffer, request_size); |
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D(bug(" request sent, actual %d, result %d\n", res, h->result)); |
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if (res >= 0) { |
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res = read(fd, buffer, reply_size); |
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D(bug(" reply read, actual %d, result %d\n", res, h->result)); |
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} |
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if (h->sense_buffer[2] & 0x0f) |
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*stat = 2; // Check condition |
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else |
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*stat = 0; // No error |
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} |
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|
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// Process S/G table when reading |
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if (reading && h->result == 0) { |
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D(bug(" reading from buffer\n")); |
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uint8 *buffer_ptr = buffer + sizeof(struct sg_header); |
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for (int i=0; i<sg_size; i++) { |
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uint32 len = sg_len[i]; |
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D(bug(" %d bytes to %08lx\n", len, sg_ptr[i])); |
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memcpy(sg_ptr[i], buffer_ptr, len); |
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buffer_ptr += len; |
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} |
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} |
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return res >= 0; |
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} |
