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Diffstat (limited to 'drivers/char/ftape/lowlevel/fc-10.c')
-rw-r--r--drivers/char/ftape/lowlevel/fc-10.c175
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diff --git a/drivers/char/ftape/lowlevel/fc-10.c b/drivers/char/ftape/lowlevel/fc-10.c
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+/*
+ *
+
+ Copyright (C) 1993,1994 Jon Tombs.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ The entire guts of this program was written by dosemu, modified to
+ record reads and writes to the ports in the 0x180-0x188 address space,
+ while running the CMS program TAPE.EXE V2.0.5 supplied with the drive.
+
+ Modified to use an array of addresses and generally cleaned up (made
+ much shorter) 4 June 94, dosemu isn't that good at writing short code it
+ would seem :-). Made independent of 0x180, but I doubt it will work
+ at any other address.
+
+ Modified for distribution with ftape source. 21 June 94, SJL.
+
+ Modifications on 20 October 95, by Daniel Cohen (catman@wpi.edu):
+ Modified to support different DMA, IRQ, and IO Ports. Borland's
+ Turbo Debugger in virtual 8086 mode (TD386.EXE with hardware breakpoints
+ provided by the TDH386.SYS Device Driver) was used on the CMS program
+ TAPE V4.0.5. I set breakpoints on I/O to ports 0x180-0x187. Note that
+ CMS's program will not successfully configure the tape drive if you set
+ breakpoints on IO Reads, but you can set them on IO Writes without problems.
+ Known problems:
+ - You can not use DMA Channels 5 or 7.
+
+ Modification on 29 January 96, by Daniel Cohen (catman@wpi.edu):
+ Modified to only accept IRQs 3 - 7, or 9. Since we can only send a 3 bit
+ number representing the IRQ to the card, special handling is required when
+ IRQ 9 is selected. IRQ 2 and 9 are the same, and we should request IRQ 9
+ from the kernel while telling the card to use IRQ 2. Thanks to Greg
+ Crider (gcrider@iclnet.org) for finding and locating this bug, as well as
+ testing the patch.
+
+ Modification on 11 December 96, by Claus Heine (claus@momo.math.rwth-aachen.de):
+ Modified a little to use variahle ft_fdc_base, ft_fdc_irq, ft_fdc_dma
+ instead of preprocessor symbols. Thus we can compile this into the module
+ or kernel and let the user specify the options as command line arguments.
+
+ *
+ * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/fc-10.c,v $
+ * $Revision: 1.2 $
+ * $Date: 1997/10/05 19:18:04 $
+ *
+ * This file contains code for the CMS FC-10/FC-20 card.
+ */
+
+#include <asm/io.h>
+#include <linux/ftape.h>
+#include "../lowlevel/ftape-tracing.h"
+#include "../lowlevel/fdc-io.h"
+#include "../lowlevel/fc-10.h"
+
+static __u16 inbs_magic[] = {
+ 0x3, 0x3, 0x0, 0x4, 0x7, 0x2, 0x5, 0x3, 0x1, 0x4,
+ 0x3, 0x5, 0x2, 0x0, 0x3, 0x7, 0x4, 0x2,
+ 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7
+};
+
+static __u16 fc10_ports[] = {
+ 0x180, 0x210, 0x2A0, 0x300, 0x330, 0x340, 0x370
+};
+
+int fc10_enable(void)
+{
+ int i;
+ __u8 cardConfig = 0x00;
+ __u8 x;
+ TRACE_FUN(ft_t_flow);
+
+/* This code will only work if the FC-10 (or FC-20) is set to
+ * use DMA channels 1, 2, or 3. DMA channels 5 and 7 seem to be
+ * initialized by the same command as channels 1 and 3, respectively.
+ */
+ if (ft_fdc_dma > 3) {
+ TRACE_ABORT(0, ft_t_err,
+"Error: The FC-10/20 must be set to use DMA channels 1, 2, or 3!");
+ }
+/* Only allow the FC-10/20 to use IRQ 3-7, or 9. Note that CMS's program
+ * only accepts IRQ's 2-7, but in linux, IRQ 2 is the same as IRQ 9.
+ */
+ if (ft_fdc_irq < 3 || ft_fdc_irq == 8 || ft_fdc_irq > 9) {
+ TRACE_ABORT(0, ft_t_err,
+"Error: The FC-10/20 must be set to use IRQ levels 3 - 7, or 9!\n"
+KERN_INFO "Note: IRQ 9 is the same as IRQ 2");
+ }
+ /* Clear state machine ???
+ */
+ for (i = 0; i < NR_ITEMS(inbs_magic); i++) {
+ inb(ft_fdc_base + inbs_magic[i]);
+ }
+ outb(0x0, ft_fdc_base);
+
+ x = inb(ft_fdc_base);
+ if (x == 0x13 || x == 0x93) {
+ for (i = 1; i < 8; i++) {
+ if (inb(ft_fdc_base + i) != x) {
+ TRACE_EXIT 0;
+ }
+ }
+ } else {
+ TRACE_EXIT 0;
+ }
+
+ outb(0x8, ft_fdc_base);
+
+ for (i = 0; i < 8; i++) {
+ if (inb(ft_fdc_base + i) != 0x0) {
+ TRACE_EXIT 0;
+ }
+ }
+ outb(0x10, ft_fdc_base);
+
+ for (i = 0; i < 8; i++) {
+ if (inb(ft_fdc_base + i) != 0xff) {
+ TRACE_EXIT 0;
+ }
+ }
+
+ /* Okay, we found a FC-10 card ! ???
+ */
+ outb(0x0, fdc.ccr);
+
+ /* Clear state machine again ???
+ */
+ for (i = 0; i < NR_ITEMS(inbs_magic); i++) {
+ inb(ft_fdc_base + inbs_magic[i]);
+ }
+ /* Send io port */
+ for (i = 0; i < NR_ITEMS(fc10_ports); i++)
+ if (ft_fdc_base == fc10_ports[i])
+ cardConfig = i + 1;
+ if (cardConfig == 0) {
+ TRACE_EXIT 0; /* Invalid I/O Port */
+ }
+ /* and IRQ - If using IRQ 9, tell the FC card it is actually IRQ 2 */
+ if (ft_fdc_irq != 9)
+ cardConfig |= ft_fdc_irq << 3;
+ else
+ cardConfig |= 2 << 3;
+
+ /* and finally DMA Channel */
+ cardConfig |= ft_fdc_dma << 6;
+ outb(cardConfig, ft_fdc_base); /* DMA [2 bits]/IRQ [3 bits]/BASE [3 bits] */
+
+ /* Enable FC-10 ???
+ */
+ outb(0, fdc.ccr);
+ outb(0, fdc.dor2);
+ outb(FDC_DMA_MODE /* 8 */, fdc.dor);
+ outb(FDC_DMA_MODE /* 8 */, fdc.dor);
+ outb(1, fdc.dor2);
+
+ /*************************************
+ *
+ * cH: why the hell should this be necessary? This is done
+ * by fdc_reset()!!!
+ *
+ *************************************/
+ /* Initialize fdc, select drive B:
+ */
+ outb(FDC_DMA_MODE, fdc.dor); /* assert reset, dma & irq enabled */
+ /* 0x08 */
+ outb(FDC_DMA_MODE|FDC_RESET_NOT, fdc.dor); /* release reset */
+ /* 0x08 | 0x04 = 0x0c */
+ outb(FDC_DMA_MODE|FDC_RESET_NOT|FDC_MOTOR_1|FTAPE_SEL_B, fdc.dor);
+ /* 0x08 | 0x04 | 0x20 | 0x01 = 0x2d */
+ /* select drive 1 */ /* why not drive 0 ???? */
+ TRACE_EXIT (x == 0x93) ? 2 : 1;
+}