Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1626 insertions, 0 deletions

diff --git a/drivers/cdrom/cm206.c b/drivers/cdrom/cm206.c
new file mode 100644
index 000000000000..da80b14335a5
--- /dev/null
+++ b/drivers/cdrom/cm206.c
@@ -0,0 +1,1626 @@
+/* cm206.c. A linux-driver for the cm206 cdrom player with cm260 adapter card.
+   Copyright (c) 1995--1997 David A. van Leeuwen.
+   $Id: cm206.c,v 1.5 1997/12/26 11:02:51 david Exp $
+   
+     This program is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published by
+     the Free Software Foundation; either version 2 of the License, or
+     (at your option) any later version.
+     
+     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.
+     
+     You should have received a copy of the GNU General Public License
+     along with this program; if not, write to the Free Software
+     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+History:
+ Started 25 jan 1994. Waiting for documentation...
+ 22 feb 1995: 0.1a first reasonably safe polling driver.
+              Two major bugs, one in read_sector and one in 
+              do_cm206_request, happened to cancel!
+ 25 feb 1995: 0.2a first reasonable interrupt driven version of above.
+              uart writes are still done in polling mode. 
+ 25 feb 1995: 0.21a writes also in interrupt mode, still some
+              small bugs to be found... Larger buffer. 
+  2 mrt 1995: 0.22 Bug found (cd-> nowhere, interrupt was called in
+              initialization), read_ahead of 16. Timeouts implemented.
+              unclear if they do something...
+  7 mrt 1995: 0.23 Start of background read-ahead.
+ 18 mrt 1995: 0.24 Working background read-ahead. (still problems)
+ 26 mrt 1995: 0.25 Multi-session ioctl added (kernel v1.2).
+              Statistics implemented, though separate stats206.h.
+              Accessible trough ioctl 0x1000 (just a number).
+              Hard to choose between v1.2 development and 1.1.75.
+              Bottom-half doesn't work with 1.2...
+              0.25a: fixed... typo. Still problems...
+  1 apr 1995: 0.26 Module support added. Most bugs found. Use kernel 1.2.n.
+  5 apr 1995: 0.27 Auto-probe for the adapter card base address.
+              Auto-probe for the adaptor card irq line.
+  7 apr 1995: 0.28 Added lilo setup support for base address and irq.
+              Use major number 32 (not in this source), officially
+              assigned to this driver.
+  9 apr 1995: 0.29 Added very limited audio support. Toc_header, stop, pause,
+              resume, eject. Play_track ignores track info, because we can't 
+              read a table-of-contents entry. Toc_entry is implemented
+              as a `placebo' function: always returns start of disc. 
+  3 may 1995: 0.30 Audio support completed. The get_toc_entry function
+              is implemented as a binary search. 
+ 15 may 1995: 0.31 More work on audio stuff. Workman is not easy to 
+              satisfy; changed binary search into linear search.
+              Auto-probe for base address somewhat relaxed.
+  1 jun 1995: 0.32 Removed probe_irq_on/off for module version.
+ 10 jun 1995: 0.33 Workman still behaves funny, but you should be
+              able to eject and substitute another disc.
+
+ An adaptation of 0.33 is included in linux-1.3.7 by Eberhard Moenkeberg
+
+ 18 jul 1995: 0.34 Patch by Heiko Eissfeldt included, mainly considering 
+              verify_area's in the ioctls. Some bugs introduced by 
+              EM considering the base port and irq fixed. 
+
+ 18 dec 1995: 0.35 Add some code for error checking... no luck...
+
+ We jump to reach our goal: version 1.0 in the next stable linux kernel.
+
+ 19 mar 1996: 0.95 Different implementation of CDROM_GET_UPC, on
+              request of Thomas Quinot. 
+ 25 mar 1996: 0.96 Interpretation of opening with O_WRONLY or O_RDWR:
+              open only for ioctl operation, e.g., for operation of
+              tray etc.
+ 4 apr 1996:  0.97 First implementation of layer between VFS and cdrom
+              driver, a generic interface. Much of the functionality
+              of cm206_open() and cm206_ioctl() is transferred to a
+              new file cdrom.c and its header ucdrom.h. 
+
+              Upgrade to Linux kernel 1.3.78. 
+
+ 11 apr 1996  0.98 Upgrade to Linux kernel 1.3.85
+              More code moved to cdrom.c
+ 
+              0.99 Some more small changes to decrease number
+              of oopses at module load; 
+ 
+ 27 jul 1996  0.100 Many hours of debugging, kernel change from 1.2.13
+              to 2.0.7 seems to have introduced some weird behavior
+              in (interruptible_)sleep_on(&cd->data): the process
+              seems to be woken without any explicit wake_up in my own
+              code. Patch to try 100x in case such untriggered wake_up's 
+              occur. 
+
+ 28 jul 1996  0.101 Rewriting of the code that receives the command echo,
+              using a fifo to store echoed bytes. 
+
+              Branch from 0.99:
+ 
+              0.99.1.0 Update to kernel release 2.0.10 dev_t -> kdev_t
+              (emoenke) various typos found by others.  extra
+              module-load oops protection.
+ 
+              0.99.1.1 Initialization constant cdrom_dops.speed
+              changed from float (2.0) to int (2); Cli()-sti() pair
+              around cm260_reset() in module initialization code.
+ 
+              0.99.1.2 Changes literally as proposed by Scott Snyder
+              <snyder@d0sgif.fnal.gov> for the 2.1 kernel line, which
+              have to do mainly with the poor minor support i had. The
+              major new concept is to change a cdrom driver's
+              operations struct from the capabilities struct. This
+              reflects the fact that there is one major for a driver,
+              whilst there can be many minors whith completely
+              different capabilities.
+
+              0.99.1.3 More changes for operations/info separation.
+
+              0.99.1.4 Added speed selection (someone had to do this
+              first).
+
+  23 jan 1997 0.99.1.5 MODULE_PARMS call added.
+
+  23 jan 1997 0.100.1.2--0.100.1.5 following similar lines as 
+              0.99.1.1--0.99.1.5. I get too many complaints about the
+              drive making read errors. What't wrong with the 2.0+
+              kernel line? Why get i (and othe cm206 owners) weird
+              results? Why were things good in the good old 1.1--1.2 
+              era? Why don't i throw away the drive?
+
+ 2 feb 1997   0.102 Added `volatile' to values in cm206_struct. Seems to 
+              reduce many of the problems. Rewrote polling routines
+              to use fixed delays between polls. 
+              0.103 Changed printk behavior. 
+              0.104 Added a 0.100 -> 0.100.1.1 change
+
+11 feb 1997   0.105 Allow auto_probe during module load, disable
+              with module option "auto_probe=0". Moved some debugging
+              statements to lower priority. Implemented select_speed()
+              function. 
+
+13 feb 1997   1.0 Final version for 2.0 kernel line. 
+
+              All following changes will be for the 2.1 kernel line. 
+
+15 feb 1997   1.1 Keep up with kernel 2.1.26, merge in changes from 
+              cdrom.c 0.100.1.1--1.0. Add some more MODULE_PARMS. 
+
+14 sep 1997   1.2 Upgrade to Linux 2.1.55.  Added blksize_size[], patch
+              sent by James Bottomley <James.Bottomley@columbiasc.ncr.com>.
+
+21 dec 1997   1.4 Upgrade to Linux 2.1.72.  
+
+24 jan 1998   Removed the cm206_disc_status() function, as it was now dead
+              code.  The Uniform CDROM driver now provides this functionality.
+              
+9 Nov. 1999   Make kernel-parameter implementation work with 2.3.x 
+              Removed init_module & cleanup_module in favor of 
+              module_init & module_exit.
+              Torben Mathiasen <tmm@image.dk>
+ * 
+ * Parts of the code are based upon lmscd.c written by Kai Petzke,
+ * sbpcd.c written by Eberhard Moenkeberg, and mcd.c by Martin
+ * Harriss, but any off-the-shelf dynamic programming algorithm won't
+ * be able to find them.
+ *
+ * The cm206 drive interface and the cm260 adapter card seem to be 
+ * sufficiently different from their cm205/cm250 counterparts
+ * in order to write a complete new driver.
+ * 
+ * I call all routines connected to the Linux kernel something
+ * with `cm206' in it, as this stuff is too series-dependent. 
+ * 
+ * Currently, my limited knowledge is based on:
+ * - The Linux Kernel Hacker's guide, v. 0.5, by Michael K. Johnson
+ * - Linux Kernel Programmierung, by Michael Beck and others
+ * - Philips/LMS cm206 and cm226 product specification
+ * - Philips/LMS cm260 product specification
+ *
+ * David van Leeuwen, david@tm.tno.nl.  */
+#define REVISION "$Revision: 1.5 $"
+
+#include <linux/module.h>
+
+#include <linux/errno.h>        /* These include what we really need */
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/cdrom.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+
+/* #include <linux/ucdrom.h> */
+
+#include <asm/io.h>
+
+#define MAJOR_NR CM206_CDROM_MAJOR
+
+#include <linux/blkdev.h>
+
+#undef DEBUG
+#define STATISTICS              /* record times and frequencies of events */
+#define AUTO_PROBE_MODULE
+#define USE_INSW
+
+#include "cm206.h"
+
+/* This variable defines whether or not to probe for adapter base port 
+   address and interrupt request. It can be overridden by the boot 
+   parameter `auto'.
+*/
+static int auto_probe = 1;      /* Yes, why not? */
+
+static int cm206_base = CM206_BASE;
+static int cm206_irq = CM206_IRQ;
+#ifdef MODULE
+static int cm206[2] = { 0, 0 }; /* for compatible `insmod' parameter passing */
+#endif
+
+MODULE_PARM(cm206_base, "i");   /* base */
+MODULE_PARM(cm206_irq, "i");    /* irq */
+MODULE_PARM(cm206, "1-2i");     /* base,irq or irq,base */
+MODULE_PARM(auto_probe, "i");   /* auto probe base and irq */
+MODULE_LICENSE("GPL");
+
+#define POLLOOP 100             /* milliseconds */
+#define READ_AHEAD 1            /* defines private buffer, waste! */
+#define BACK_AHEAD 1            /* defines adapter-read ahead */
+#define DATA_TIMEOUT (3*HZ)     /* measured in jiffies (10 ms) */
+#define UART_TIMEOUT (5*HZ/100)
+#define DSB_TIMEOUT (7*HZ)      /* time for the slowest command to finish */
+#define UR_SIZE 4               /* uart receive buffer fifo size */
+
+#define LINUX_BLOCK_SIZE 512    /* WHERE is this defined? */
+#define RAW_SECTOR_SIZE 2352    /* ok, is also defined in cdrom.h */
+#define ISO_SECTOR_SIZE 2048
+#define BLOCKS_ISO (ISO_SECTOR_SIZE/LINUX_BLOCK_SIZE)   /* 4 */
+#define CD_SYNC_HEAD 16         /* CD_SYNC + CD_HEAD */
+
+#ifdef STATISTICS               /* keep track of errors in counters */
+#define stats(i) { ++cd->stats[st_ ## i]; \
+                     cd->last_stat[st_ ## i] = cd->stat_counter++; \
+                 }
+#else
+#define stats(i) (void) 0;
+#endif
+
+#define Debug(a) {printk (KERN_DEBUG); printk a;}
+#ifdef DEBUG
+#define debug(a) Debug(a)
+#else
+#define debug(a) (void) 0;
+#endif
+
+typedef unsigned char uch;      /* 8-bits */
+typedef unsigned short ush;     /* 16-bits */
+
+struct toc_struct {             /* private copy of Table of Contents */
+        uch track, fsm[3], q0;
+};
+
+struct cm206_struct {
+        volatile ush intr_ds;   /* data status read on last interrupt */
+        volatile ush intr_ls;   /* uart line status read on last interrupt */
+        volatile uch ur[UR_SIZE];       /* uart receive buffer fifo */
+        volatile uch ur_w, ur_r;        /* write/read buffer index */
+        volatile uch dsb, cc;   /* drive status byte and condition (error) code */
+        int command;            /* command to be written to the uart */
+        int openfiles;
+        ush sector[READ_AHEAD * RAW_SECTOR_SIZE / 2];   /* buffered cd-sector */
+        int sector_first, sector_last;  /* range of these sectors */
+        wait_queue_head_t uart; /* wait queues for interrupt */
+        wait_queue_head_t data;
+        struct timer_list timer;        /* time-out */
+        char timed_out;
+        signed char max_sectors;        /* number of sectors that fit in adapter mem */
+        char wait_back;         /* we're waiting for a background-read */
+        char background;        /* is a read going on in the background? */
+        int adapter_first;      /* if so, that's the starting sector */
+        int adapter_last;
+        char fifo_overflowed;
+        uch disc_status[7];     /* result of get_disc_status command */
+#ifdef STATISTICS
+        int stats[NR_STATS];
+        int last_stat[NR_STATS];        /* `time' at which stat was stat */
+        int stat_counter;
+#endif
+        struct toc_struct toc[101];     /* The whole table of contents + lead-out */
+        uch q[10];              /* Last read q-channel info */
+        uch audio_status[5];    /* last read position on pause */
+        uch media_changed;      /* record if media changed */
+};
+
+#define DISC_STATUS cd->disc_status[0]
+#define FIRST_TRACK cd->disc_status[1]
+#define LAST_TRACK cd->disc_status[2]
+#define PAUSED cd->audio_status[0]      /* misuse this memory byte! */
+#define PLAY_TO cd->toc[0]      /* toc[0] records end-time in play */
+
+static struct cm206_struct *cd; /* the main memory structure */
+static struct request_queue *cm206_queue;
+static DEFINE_SPINLOCK(cm206_lock);
+
+/* First, we define some polling functions. These are actually
+   only being used in the initialization. */
+
+void send_command_polled(int command)
+{
+        int loop = POLLOOP;
+        while (!(inw(r_line_status) & ls_transmitter_buffer_empty)
+               && loop > 0) {
+                mdelay(1);      /* one millisec delay */
+                --loop;
+        }
+        outw(command, r_uart_transmit);
+}
+
+uch receive_echo_polled(void)
+{
+        int loop = POLLOOP;
+        while (!(inw(r_line_status) & ls_receive_buffer_full) && loop > 0) {
+                mdelay(1);
+                --loop;
+        }
+        return ((uch) inw(r_uart_receive));
+}
+
+uch send_receive_polled(int command)
+{
+        send_command_polled(command);
+        return receive_echo_polled();
+}
+
+inline void clear_ur(void)
+{
+        if (cd->ur_r != cd->ur_w) {
+                debug(("Deleting bytes from fifo:"));
+                for (; cd->ur_r != cd->ur_w;
+                     cd->ur_r++, cd->ur_r %= UR_SIZE)
+                        debug((" 0x%x", cd->ur[cd->ur_r]));
+                debug(("\n"));
+        }
+}
+
+static struct tasklet_struct cm206_tasklet;
+
+/* The interrupt handler. When the cm260 generates an interrupt, very
+   much care has to be taken in reading out the registers in the right
+   order; in case of a receive_buffer_full interrupt, first the
+   uart_receive must be read, and then the line status again to
+   de-assert the interrupt line. It took me a couple of hours to find
+   this out:-( 
+
+   The function reset_cm206 appears to cause an interrupt, because
+   pulling up the INIT line clears both the uart-write-buffer /and/
+   the uart-write-buffer-empty mask. We call this a `lost interrupt,'
+   as there seems so reason for this to happen.
+*/
+
+static irqreturn_t cm206_interrupt(int sig, void *dev_id, struct pt_regs *regs)
+{
+        volatile ush fool;
+        cd->intr_ds = inw(r_data_status);       /* resets data_ready, data_error,
+                                                   crc_error, sync_error, toc_ready 
+                                                   interrupts */
+        cd->intr_ls = inw(r_line_status);       /* resets overrun bit */
+        debug(("Intr, 0x%x 0x%x, %d\n", cd->intr_ds, cd->intr_ls,
+               cd->background));
+        if (cd->intr_ls & ls_attention)
+                stats(attention);
+        /* receive buffer full? */
+        if (cd->intr_ls & ls_receive_buffer_full) {
+                cd->ur[cd->ur_w] = inb(r_uart_receive); /* get order right! */
+                cd->intr_ls = inw(r_line_status);       /* resets rbf interrupt */
+                debug(("receiving #%d: 0x%x\n", cd->ur_w,
+                       cd->ur[cd->ur_w]));
+                cd->ur_w++;
+                cd->ur_w %= UR_SIZE;
+                if (cd->ur_w == cd->ur_r)
+                        debug(("cd->ur overflow!\n"));
+                if (waitqueue_active(&cd->uart) && cd->background < 2) {
+                        del_timer(&cd->timer);
+                        wake_up_interruptible(&cd->uart);
+                }
+        }
+        /* data ready in fifo? */
+        else if (cd->intr_ds & ds_data_ready) {
+                if (cd->background)
+                        ++cd->adapter_last;
+                if (waitqueue_active(&cd->data)
+                    && (cd->wait_back || !cd->background)) {
+                        del_timer(&cd->timer);
+                        wake_up_interruptible(&cd->data);
+                }
+                stats(data_ready);
+        }
+        /* ready to issue a write command? */
+        else if (cd->command && cd->intr_ls & ls_transmitter_buffer_empty) {
+                outw(dc_normal | (inw(r_data_status) & 0x7f),
+                     r_data_control);
+                outw(cd->command, r_uart_transmit);
+                cd->command = 0;
+                if (!cd->background)
+                        wake_up_interruptible(&cd->uart);
+        }
+        /* now treat errors (at least, identify them for debugging) */
+        else if (cd->intr_ds & ds_fifo_overflow) {
+                debug(("Fifo overflow at sectors 0x%x\n",
+                       cd->sector_first));
+                fool = inw(r_fifo_output_buffer);       /* de-assert the interrupt */
+                cd->fifo_overflowed = 1;        /* signal one word less should be read */
+                stats(fifo_overflow);
+        } else if (cd->intr_ds & ds_data_error) {
+                debug(("Data error at sector 0x%x\n", cd->sector_first));
+                stats(data_error);
+        } else if (cd->intr_ds & ds_crc_error) {
+                debug(("CRC error at sector 0x%x\n", cd->sector_first));
+                stats(crc_error);
+        } else if (cd->intr_ds & ds_sync_error) {
+                debug(("Sync at sector 0x%x\n", cd->sector_first));
+                stats(sync_error);
+        } else if (cd->intr_ds & ds_toc_ready) {
+                /* do something appropriate */
+        }
+        /* couldn't see why this interrupt, maybe due to init */
+        else {
+                outw(dc_normal | READ_AHEAD, r_data_control);
+                stats(lost_intr);
+        }
+        if (cd->background
+            && (cd->adapter_last - cd->adapter_first == cd->max_sectors
+                || cd->fifo_overflowed))
+                tasklet_schedule(&cm206_tasklet);       /* issue a stop read command */
+        stats(interrupt);
+        return IRQ_HANDLED;
+}
+
+/* we have put the address of the wait queue in who */
+void cm206_timeout(unsigned long who)
+{
+        cd->timed_out = 1;
+        debug(("Timing out\n"));
+        wake_up_interruptible((wait_queue_head_t *) who);
+}
+
+/* This function returns 1 if a timeout occurred, 0 if an interrupt
+   happened */
+int sleep_or_timeout(wait_queue_head_t * wait, int timeout)
+{
+        cd->timed_out = 0;
+        init_timer(&cd->timer);
+        cd->timer.data = (unsigned long) wait;
+        cd->timer.expires = jiffies + timeout;
+        add_timer(&cd->timer);
+        debug(("going to sleep\n"));
+        interruptible_sleep_on(wait);
+        del_timer(&cd->timer);
+        if (cd->timed_out) {
+                cd->timed_out = 0;
+                return 1;
+        } else
+                return 0;
+}
+
+void cm206_delay(int nr_jiffies)
+{
+        DECLARE_WAIT_QUEUE_HEAD(wait);
+        sleep_or_timeout(&wait, nr_jiffies);
+}
+
+void send_command(int command)
+{
+        debug(("Sending 0x%x\n", command));
+        if (!(inw(r_line_status) & ls_transmitter_buffer_empty)) {
+                cd->command = command;
+                cli();          /* don't interrupt before sleep */
+                outw(dc_mask_sync_error | dc_no_stop_on_error |
+                     (inw(r_data_status) & 0x7f), r_data_control);
+                /* interrupt routine sends command */
+                if (sleep_or_timeout(&cd->uart, UART_TIMEOUT)) {
+                        debug(("Time out on write-buffer\n"));
+                        stats(write_timeout);
+                        outw(command, r_uart_transmit);
+                }
+                debug(("Write commmand delayed\n"));
+        } else
+                outw(command, r_uart_transmit);
+}
+
+uch receive_byte(int timeout)
+{
+        uch ret;
+        cli();
+        debug(("cli\n"));
+        ret = cd->ur[cd->ur_r];
+        if (cd->ur_r != cd->ur_w) {
+                sti();
+                debug(("returning #%d: 0x%x\n", cd->ur_r,
+                       cd->ur[cd->ur_r]));
+                cd->ur_r++;
+                cd->ur_r %= UR_SIZE;
+                return ret;
+        } else if (sleep_or_timeout(&cd->uart, timeout)) {      /* does sti() */
+                debug(("Time out on receive-buffer\n"));
+#ifdef STATISTICS
+                if (timeout == UART_TIMEOUT)
+                        stats(receive_timeout)  /* no `;'! */
+                            else
+                        stats(dsb_timeout);
+#endif
+                return 0xda;
+        }
+        ret = cd->ur[cd->ur_r];
+        debug(("slept; returning #%d: 0x%x\n", cd->ur_r,
+               cd->ur[cd->ur_r]));
+        cd->ur_r++;
+        cd->ur_r %= UR_SIZE;
+        return ret;
+}
+
+inline uch receive_echo(void)
+{
+        return receive_byte(UART_TIMEOUT);
+}
+
+inline uch send_receive(int command)
+{
+        send_command(command);
+        return receive_echo();
+}
+
+inline uch wait_dsb(void)
+{
+        return receive_byte(DSB_TIMEOUT);
+}
+
+int type_0_command(int command, int expect_dsb)
+{
+        int e;
+        clear_ur();
+        if (command != (e = send_receive(command))) {
+                debug(("command 0x%x echoed as 0x%x\n", command, e));
+                stats(echo);
+                return -1;
+        }
+        if (expect_dsb) {
+                cd->dsb = wait_dsb();   /* wait for command to finish */
+        }
+        return 0;
+}
+
+int type_1_command(int command, int bytes, uch * status)
+{                               /* returns info */
+        int i;
+        if (type_0_command(command, 0))
+                return -1;
+        for (i = 0; i < bytes; i++)
+                status[i] = send_receive(c_gimme);
+        return 0;
+}
+
+/* This function resets the adapter card. We'd better not do this too
+ * often, because it tends to generate `lost interrupts.' */
+void reset_cm260(void)
+{
+        outw(dc_normal | dc_initialize | READ_AHEAD, r_data_control);
+        udelay(10);             /* 3.3 mu sec minimum */
+        outw(dc_normal | READ_AHEAD, r_data_control);
+}
+
+/* fsm: frame-sec-min from linear address; one of many */
+void fsm(int lba, uch * fsm)
+{
+        fsm[0] = lba % 75;
+        lba /= 75;
+        lba += 2;
+        fsm[1] = lba % 60;
+        fsm[2] = lba / 60;
+}
+
+inline int fsm2lba(uch * fsm)
+{
+        return fsm[0] + 75 * (fsm[1] - 2 + 60 * fsm[2]);
+}
+
+inline int f_s_m2lba(uch f, uch s, uch m)
+{
+        return f + 75 * (s - 2 + 60 * m);
+}
+
+int start_read(int start)
+{
+        uch read_sector[4] = { c_read_data, };
+        int i, e;
+
+        fsm(start, &read_sector[1]);
+        clear_ur();
+        for (i = 0; i < 4; i++)
+                if (read_sector[i] != (e = send_receive(read_sector[i]))) {
+                        debug(("read_sector: %x echoes %x\n",
+                               read_sector[i], e));
+                        stats(echo);
+                        if (e == 0xff) {        /* this seems to happen often */
+                                e = receive_echo();
+                                debug(("Second try %x\n", e));
+                                if (e != read_sector[i])
+                                        return -1;
+                        }
+                }
+        return 0;
+}
+
+int stop_read(void)
+{
+        int e;
+        type_0_command(c_stop, 0);
+        if ((e = receive_echo()) != 0xff) {
+                debug(("c_stop didn't send 0xff, but 0x%x\n", e));
+                stats(stop_0xff);
+                return -1;
+        }
+        return 0;
+}
+
+/* This function starts to read sectors in adapter memory, the
+   interrupt routine should stop the read. In fact, the bottom_half
+   routine takes care of this. Set a flag `background' in the cd
+   struct to indicate the process. */
+
+int read_background(int start, int reading)
+{
+        if (cd->background)
+                return -1;      /* can't do twice */
+        outw(dc_normal | BACK_AHEAD, r_data_control);
+        if (!reading && start_read(start))
+                return -2;
+        cd->adapter_first = cd->adapter_last = start;
+        cd->background = 1;     /* flag a read is going on */
+        return 0;
+}
+
+#ifdef USE_INSW
+#define transport_data insw
+#else
+/* this routine implements insw(,,). There was a time i had the
+   impression that there would be any difference in error-behaviour. */
+void transport_data(int port, ush * dest, int count)
+{
+        int i;
+        ush *d;
+        for (i = 0, d = dest; i < count; i++, d++)
+                *d = inw(port);
+}
+#endif
+
+
+#define MAX_TRIES 100
+int read_sector(int start)
+{
+        int tries = 0;
+        if (cd->background) {
+                cd->background = 0;
+                cd->adapter_last = -1;  /* invalidate adapter memory */
+                stop_read();
+        }
+        cd->fifo_overflowed = 0;
+        reset_cm260();          /* empty fifo etc. */
+        if (start_read(start))
+                return -1;
+        do {
+                if (sleep_or_timeout(&cd->data, DATA_TIMEOUT)) {
+                        debug(("Read timed out sector 0x%x\n", start));
+                        stats(read_timeout);
+                        stop_read();
+                        return -3;
+                }
+                tries++;
+        } while (cd->intr_ds & ds_fifo_empty && tries < MAX_TRIES);
+        if (tries > 1)
+                debug(("Took me some tries\n"))
+                    else
+        if (tries == MAX_TRIES)
+                debug(("MAX_TRIES tries for read sector\n"));
+        transport_data(r_fifo_output_buffer, cd->sector,
+                       READ_AHEAD * RAW_SECTOR_SIZE / 2);
+        if (read_background(start + READ_AHEAD, 1))
+                stats(read_background);
+        cd->sector_first = start;
+        cd->sector_last = start + READ_AHEAD;
+        stats(read_restarted);
+        return 0;
+}
+
+/* The function of bottom-half is to send a stop command to the drive
+   This isn't easy because the routine is not `owned' by any process;
+   we can't go to sleep! The variable cd->background gives the status:
+   0 no read pending
+   1 a read is pending
+   2 c_stop waits for write_buffer_empty
+   3 c_stop waits for receive_buffer_full: echo
+   4 c_stop waits for receive_buffer_full: 0xff
+*/
+
+static void cm206_tasklet_func(unsigned long ignore)
+{
+        debug(("bh: %d\n", cd->background));
+        switch (cd->background) {
+        case 1:
+                stats(bh);
+                if (!(cd->intr_ls & ls_transmitter_buffer_empty)) {
+                        cd->command = c_stop;
+                        outw(dc_mask_sync_error | dc_no_stop_on_error |
+                             (inw(r_data_status) & 0x7f), r_data_control);
+                        cd->background = 2;
+                        break;  /* we'd better not time-out here! */
+                } else
+                        outw(c_stop, r_uart_transmit);
+                /* fall into case 2: */
+        case 2:
+                /* the write has been satisfied by interrupt routine */
+                cd->background = 3;
+                break;
+        case 3:
+                if (cd->ur_r != cd->ur_w) {
+                        if (cd->ur[cd->ur_r] != c_stop) {
+                                debug(("cm206_bh: c_stop echoed 0x%x\n",
+                                       cd->ur[cd->ur_r]));
+                                stats(echo);
+                        }
+                        cd->ur_r++;
+                        cd->ur_r %= UR_SIZE;
+                }
+                cd->background++;
+                break;
+        case 4:
+                if (cd->ur_r != cd->ur_w) {
+                        if (cd->ur[cd->ur_r] != 0xff) {
+                                debug(("cm206_bh: c_stop reacted with 0x%x\n", cd->ur[cd->ur_r]));
+                                stats(stop_0xff);
+                        }
+                        cd->ur_r++;
+                        cd->ur_r %= UR_SIZE;
+                }
+                cd->background = 0;
+        }
+}
+
+static DECLARE_TASKLET(cm206_tasklet, cm206_tasklet_func, 0);
+
+/* This command clears the dsb_possible_media_change flag, so we must 
+ * retain it.
+ */
+void get_drive_status(void)
+{
+        uch status[2];
+        type_1_command(c_drive_status, 2, status);      /* this might be done faster */
+        cd->dsb = status[0];
+        cd->cc = status[1];
+        cd->media_changed |=
+            !!(cd->dsb & (dsb_possible_media_change |
+                          dsb_drive_not_ready | dsb_tray_not_closed));
+}
+
+void get_disc_status(void)
+{
+        if (type_1_command(c_disc_status, 7, cd->disc_status)) {
+                debug(("get_disc_status: error\n"));
+        }
+}
+
+/* The new open. The real opening strategy is defined in cdrom.c. */
+
+static int cm206_open(struct cdrom_device_info *cdi, int purpose)
+{
+        if (!cd->openfiles) {   /* reset only first time */
+                cd->background = 0;
+                reset_cm260();
+                cd->adapter_last = -1;  /* invalidate adapter memory */
+                cd->sector_last = -1;
+        }
+        ++cd->openfiles;
+        stats(open);
+        return 0;
+}
+
+static void cm206_release(struct cdrom_device_info *cdi)
+{
+        if (cd->openfiles == 1) {
+                if (cd->background) {
+                        cd->background = 0;
+                        stop_read();
+                }
+                cd->sector_last = -1;   /* Make our internal buffer invalid */
+                FIRST_TRACK = 0;        /* No valid disc status */
+        }
+        --cd->openfiles;
+}
+
+/* Empty buffer empties $sectors$ sectors of the adapter card buffer,
+ * and then reads a sector in kernel memory.  */
+void empty_buffer(int sectors)
+{
+        while (sectors >= 0) {
+                transport_data(r_fifo_output_buffer,
+                               cd->sector + cd->fifo_overflowed,
+                               RAW_SECTOR_SIZE / 2 - cd->fifo_overflowed);
+                --sectors;
+                ++cd->adapter_first;    /* update the current adapter sector */
+                cd->fifo_overflowed = 0;        /* reset overflow bit */
+                stats(sector_transferred);
+        }
+        cd->sector_first = cd->adapter_first - 1;
+        cd->sector_last = cd->adapter_first;    /* update the buffer sector */
+}
+
+/* try_adapter. This function determines if the requested sector is
+   in adapter memory, or will appear there soon. Returns 0 upon
+   success */
+int try_adapter(int sector)
+{
+        if (cd->adapter_first <= sector && sector < cd->adapter_last) {
+                /* sector is in adapter memory */
+                empty_buffer(sector - cd->adapter_first);
+                return 0;
+        } else if (cd->background == 1 && cd->adapter_first <= sector
+                   && sector < cd->adapter_first + cd->max_sectors) {
+                /* a read is going on, we can wait for it */
+                cd->wait_back = 1;
+                while (sector >= cd->adapter_last) {
+                        if (sleep_or_timeout(&cd->data, DATA_TIMEOUT)) {
+                                debug(("Timed out during background wait: %d %d %d %d\n", sector, cd->adapter_last, cd->adapter_first, cd->background));
+                                stats(back_read_timeout);
+                                cd->wait_back = 0;
+                                return -1;
+                        }
+                }
+                cd->wait_back = 0;
+                empty_buffer(sector - cd->adapter_first);
+                return 0;
+        } else
+                return -2;
+}
+
+/* This is not a very smart implementation. We could optimize for 
+   consecutive block numbers. I'm not convinced this would really
+   bring down the processor load. */
+static void do_cm206_request(request_queue_t * q)
+{
+        long int i, cd_sec_no;
+        int quarter, error;
+        uch *source, *dest;
+        struct request *req;
+
+        while (1) {     /* repeat until all requests have been satisfied */
+                req = elv_next_request(q);
+                if (!req)
+                        return;
+
+                if (req->cmd != READ) {
+                        debug(("Non-read command %d on cdrom\n", req->cmd));
+                        end_request(req, 0);
+                        continue;
+                }
+                spin_unlock_irq(q->queue_lock);
+                error = 0;
+                for (i = 0; i < req->nr_sectors; i++) {
+                        int e1, e2;
+                        cd_sec_no = (req->sector + i) / BLOCKS_ISO;     /* 4 times 512 bytes */
+                        quarter = (req->sector + i) % BLOCKS_ISO;
+                        dest = req->buffer + i * LINUX_BLOCK_SIZE;
+                        /* is already in buffer memory? */
+                        if (cd->sector_first <= cd_sec_no
+                            && cd_sec_no < cd->sector_last) {
+                                source =
+                                    ((uch *) cd->sector) + 16 +
+                                    quarter * LINUX_BLOCK_SIZE +
+                                    (cd_sec_no -
+                                     cd->sector_first) * RAW_SECTOR_SIZE;
+                                memcpy(dest, source, LINUX_BLOCK_SIZE);
+                        } else if (!(e1 = try_adapter(cd_sec_no)) ||
+                                   !(e2 = read_sector(cd_sec_no))) {
+                                source =
+                                    ((uch *) cd->sector) + 16 +
+                                    quarter * LINUX_BLOCK_SIZE;
+                                memcpy(dest, source, LINUX_BLOCK_SIZE);
+                        } else {
+                                error = 1;
+                                debug(("cm206_request: %d %d\n", e1, e2));
+                        }
+                }
+                spin_lock_irq(q->queue_lock);
+                end_request(req, !error);
+        }
+}
+
+/* Audio support. I've tried very hard, but the cm206 drive doesn't 
+   seem to have a get_toc (table-of-contents) function, while i'm
+   pretty sure it must read the toc upon disc insertion. Therefore
+   this function has been implemented through a binary search 
+   strategy. All track starts that happen to be found are stored in
+   cd->toc[], for future use. 
+
+   I've spent a whole day on a bug that only shows under Workman---
+   I don't get it. Tried everything, nothing works. If workman asks
+   for track# 0xaa, it'll get the wrong time back. Any other program
+   receives the correct value. I'm stymied.
+*/
+
+/* seek seeks to address lba. It does wait to arrive there. */
+void seek(int lba)
+{
+        int i;
+        uch seek_command[4] = { c_seek, };
+
+        fsm(lba, &seek_command[1]);
+        for (i = 0; i < 4; i++)
+                type_0_command(seek_command[i], 0);
+        cd->dsb = wait_dsb();
+}
+
+uch bcdbin(unsigned char bcd)
+{                               /* stolen from mcd.c! */
+        return (bcd >> 4) * 10 + (bcd & 0xf);
+}
+
+inline uch normalize_track(uch track)
+{
+        if (track < 1)
+                return 1;
+        if (track > LAST_TRACK)
+                return LAST_TRACK + 1;
+        return track;
+}
+
+/* This function does a binary search for track start. It records all
+ * tracks seen in the process. Input $track$ must be between 1 and
+ * #-of-tracks+1.  Note that the start of the disc must be in toc[1].fsm. 
+ */
+int get_toc_lba(uch track)
+{
+        int max = 74 * 60 * 75 - 150, min = fsm2lba(cd->toc[1].fsm);
+        int i, lba, l, old_lba = 0;
+        uch *q = cd->q;
+        uch ct;                 /* current track */
+        int binary = 0;
+        const int skip = 3 * 60 * 75;   /* 3 minutes */
+
+        for (i = track; i > 0; i--)
+                if (cd->toc[i].track) {
+                        min = fsm2lba(cd->toc[i].fsm);
+                        break;
+                }
+        lba = min + skip;
+        do {
+                seek(lba);
+                type_1_command(c_read_current_q, 10, q);
+                ct = normalize_track(q[1]);
+                if (!cd->toc[ct].track) {
+                        l = q[9] - bcdbin(q[5]) + 75 * (q[8] -
+                                                        bcdbin(q[4]) - 2 +
+                                                        60 * (q[7] -
+                                                              bcdbin(q
+                                                                     [3])));
+                        cd->toc[ct].track = q[1];       /* lead out still 0xaa */
+                        fsm(l, cd->toc[ct].fsm);
+                        cd->toc[ct].q0 = q[0];  /* contains adr and ctrl info */
+                        if (ct == track)
+                                return l;
+                }
+                old_lba = lba;
+                if (binary) {
+                        if (ct < track)
+                                min = lba;
+                        else
+                                max = lba;
+                        lba = (min + max) / 2;
+                } else {
+                        if (ct < track)
+                                lba += skip;
+                        else {
+                                binary = 1;
+                                max = lba;
+                                min = lba - skip;
+                                lba = (min + max) / 2;
+                        }
+                }
+        } while (lba != old_lba);
+        return lba;
+}
+
+void update_toc_entry(uch track)
+{
+        track = normalize_track(track);
+        if (!cd->toc[track].track)
+                get_toc_lba(track);
+}
+
+/* return 0 upon success */
+int read_toc_header(struct cdrom_tochdr *hp)
+{
+        if (!FIRST_TRACK)
+                get_disc_status();
+        if (hp) {
+                int i;
+                hp->cdth_trk0 = FIRST_TRACK;
+                hp->cdth_trk1 = LAST_TRACK;
+                /* fill in first track position */
+                for (i = 0; i < 3; i++)
+                        cd->toc[1].fsm[i] = cd->disc_status[3 + i];
+                update_toc_entry(LAST_TRACK + 1);       /* find most entries */
+                return 0;
+        }
+        return -1;
+}
+
+void play_from_to_msf(struct cdrom_msf *msfp)
+{
+        uch play_command[] = { c_play,
+                msfp->cdmsf_frame0, msfp->cdmsf_sec0, msfp->cdmsf_min0,
+                msfp->cdmsf_frame1, msfp->cdmsf_sec1, msfp->cdmsf_min1, 2,
+                    2
+        };
+        int i;
+        for (i = 0; i < 9; i++)
+                type_0_command(play_command[i], 0);
+        for (i = 0; i < 3; i++)
+                PLAY_TO.fsm[i] = play_command[i + 4];
+        PLAY_TO.track = 0;      /* say no track end */
+        cd->dsb = wait_dsb();
+}
+
+void play_from_to_track(int from, int to)
+{
+        uch play_command[8] = { c_play, };
+        int i;
+
+        if (from == 0) {        /* continue paused play */
+                for (i = 0; i < 3; i++) {
+                        play_command[i + 1] = cd->audio_status[i + 2];
+                        play_command[i + 4] = PLAY_TO.fsm[i];
+                }
+        } else {
+                update_toc_entry(from);
+                update_toc_entry(to + 1);
+                for (i = 0; i < 3; i++) {
+                        play_command[i + 1] = cd->toc[from].fsm[i];
+                        PLAY_TO.fsm[i] = play_command[i + 4] =
+                            cd->toc[to + 1].fsm[i];
+                }
+                PLAY_TO.track = to;
+        }
+        for (i = 0; i < 7; i++)
+                type_0_command(play_command[i], 0);
+        for (i = 0; i < 2; i++)
+                type_0_command(0x2, 0); /* volume */
+        cd->dsb = wait_dsb();
+}
+
+int get_current_q(struct cdrom_subchnl *qp)
+{
+        int i;
+        uch *q = cd->q;
+        if (type_1_command(c_read_current_q, 10, q))
+                return 0;
+/*  q[0] = bcdbin(q[0]); Don't think so! */
+        for (i = 2; i < 6; i++)
+                q[i] = bcdbin(q[i]);
+        qp->cdsc_adr = q[0] & 0xf;
+        qp->cdsc_ctrl = q[0] >> 4;      /* from mcd.c */
+        qp->cdsc_trk = q[1];
+        qp->cdsc_ind = q[2];
+        if (qp->cdsc_format == CDROM_MSF) {
+                qp->cdsc_reladdr.msf.minute = q[3];
+                qp->cdsc_reladdr.msf.second = q[4];
+                qp->cdsc_reladdr.msf.frame = q[5];
+                qp->cdsc_absaddr.msf.minute = q[7];
+                qp->cdsc_absaddr.msf.second = q[8];
+                qp->cdsc_absaddr.msf.frame = q[9];
+        } else {
+                qp->cdsc_reladdr.lba = f_s_m2lba(q[5], q[4], q[3]);
+                qp->cdsc_absaddr.lba = f_s_m2lba(q[9], q[8], q[7]);
+        }
+        get_drive_status();
+        if (cd->dsb & dsb_play_in_progress)
+                qp->cdsc_audiostatus = CDROM_AUDIO_PLAY;
+        else if (PAUSED)
+                qp->cdsc_audiostatus = CDROM_AUDIO_PAUSED;
+        else
+                qp->cdsc_audiostatus = CDROM_AUDIO_NO_STATUS;
+        return 0;
+}
+
+void invalidate_toc(void)
+{
+        memset(cd->toc, 0, sizeof(cd->toc));
+        memset(cd->disc_status, 0, sizeof(cd->disc_status));
+}
+
+/* cdrom.c guarantees that cdte_format == CDROM_MSF */
+void get_toc_entry(struct cdrom_tocentry *ep)
+{
+        uch track = normalize_track(ep->cdte_track);
+        update_toc_entry(track);
+        ep->cdte_addr.msf.frame = cd->toc[track].fsm[0];
+        ep->cdte_addr.msf.second = cd->toc[track].fsm[1];
+        ep->cdte_addr.msf.minute = cd->toc[track].fsm[2];
+        ep->cdte_adr = cd->toc[track].q0 & 0xf;
+        ep->cdte_ctrl = cd->toc[track].q0 >> 4;
+        ep->cdte_datamode = 0;
+}
+
+/* Audio ioctl.  Ioctl commands connected to audio are in such an
+ * idiosyncratic i/o format, that we leave these untouched. Return 0
+ * upon success. Memory checking has been done by cdrom_ioctl(), the
+ * calling function, as well as LBA/MSF sanitization.
+*/
+int cm206_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
+                      void *arg)
+{
+        switch (cmd) {
+        case CDROMREADTOCHDR:
+                return read_toc_header((struct cdrom_tochdr *) arg);
+        case CDROMREADTOCENTRY:
+                get_toc_entry((struct cdrom_tocentry *) arg);
+                return 0;
+        case CDROMPLAYMSF:
+                play_from_to_msf((struct cdrom_msf *) arg);
+                return 0;
+        case CDROMPLAYTRKIND:   /* admittedly, not particularly beautiful */
+                play_from_to_track(((struct cdrom_ti *) arg)->cdti_trk0,
+                                   ((struct cdrom_ti *) arg)->cdti_trk1);
+                return 0;
+        case CDROMSTOP:
+                PAUSED = 0;
+                if (cd->dsb & dsb_play_in_progress)
+                        return type_0_command(c_stop, 1);
+                else
+                        return 0;
+        case CDROMPAUSE:
+                get_drive_status();
+                if (cd->dsb & dsb_play_in_progress) {
+                        type_0_command(c_stop, 1);
+                        type_1_command(c_audio_status, 5,
+                                       cd->audio_status);
+                        PAUSED = 1;     /* say we're paused */
+                }
+                return 0;
+        case CDROMRESUME:
+                if (PAUSED)
+                        play_from_to_track(0, 0);
+                PAUSED = 0;
+                return 0;
+        case CDROMSTART:
+        case CDROMVOLCTRL:
+                return 0;
+        case CDROMSUBCHNL:
+                return get_current_q((struct cdrom_subchnl *) arg);
+        default:
+                return -EINVAL;
+        }
+}
+
+/* Ioctl. These ioctls are specific to the cm206 driver. I have made
+   some driver statistics accessible through ioctl calls.
+ */
+
+static int cm206_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
+                       unsigned long arg)
+{
+        switch (cmd) {
+#ifdef STATISTICS
+        case CM206CTL_GET_STAT:
+                if (arg >= NR_STATS)
+                        return -EINVAL;
+                else
+                        return cd->stats[arg];
+        case CM206CTL_GET_LAST_STAT:
+                if (arg >= NR_STATS)
+                        return -EINVAL;
+                else
+                        return cd->last_stat[arg];
+#endif
+        default:
+                debug(("Unknown ioctl call 0x%x\n", cmd));
+                return -EINVAL;
+        }
+}
+
+int cm206_media_changed(struct cdrom_device_info *cdi, int disc_nr)
+{
+        if (cd != NULL) {
+                int r;
+                get_drive_status();     /* ensure cd->media_changed OK */
+                r = cd->media_changed;
+                cd->media_changed = 0;  /* clear bit */
+                return r;
+        } else
+                return -EIO;
+}
+
+/* The new generic cdrom support. Routines should be concise, most of
+   the logic should be in cdrom.c */
+
+/* returns number of times device is in use */
+int cm206_open_files(struct cdrom_device_info *cdi)
+{
+        if (cd)
+                return cd->openfiles;
+        return -1;
+}
+
+/* controls tray movement */
+int cm206_tray_move(struct cdrom_device_info *cdi, int position)
+{
+        if (position) {         /* 1: eject */
+                type_0_command(c_open_tray, 1);
+                invalidate_toc();
+        } else
+                type_0_command(c_close_tray, 1);        /* 0: close */
+        return 0;
+}
+
+/* gives current state of the drive */
+int cm206_drive_status(struct cdrom_device_info *cdi, int slot_nr)
+{
+        get_drive_status();
+        if (cd->dsb & dsb_tray_not_closed)
+                return CDS_TRAY_OPEN;
+        if (!(cd->dsb & dsb_disc_present))
+                return CDS_NO_DISC;
+        if (cd->dsb & dsb_drive_not_ready)
+                return CDS_DRIVE_NOT_READY;
+        return CDS_DISC_OK;
+}
+
+/* locks or unlocks door lock==1: lock; return 0 upon success */
+int cm206_lock_door(struct cdrom_device_info *cdi, int lock)
+{
+        uch command = (lock) ? c_lock_tray : c_unlock_tray;
+        type_0_command(command, 1);     /* wait and get dsb */
+        /* the logic calculates the success, 0 means successful */
+        return lock ^ ((cd->dsb & dsb_tray_locked) != 0);
+}
+
+/* Although a session start should be in LBA format, we return it in 
+   MSF format because it is slightly easier, and the new generic ioctl
+   will take care of the necessary conversion. */
+int cm206_get_last_session(struct cdrom_device_info *cdi,
+                           struct cdrom_multisession *mssp)
+{
+        if (!FIRST_TRACK)
+                get_disc_status();
+        if (mssp != NULL) {
+                if (DISC_STATUS & cds_multi_session) {  /* multi-session */
+                        mssp->addr.msf.frame = cd->disc_status[3];
+                        mssp->addr.msf.second = cd->disc_status[4];
+                        mssp->addr.msf.minute = cd->disc_status[5];
+                        mssp->addr_format = CDROM_MSF;
+                        mssp->xa_flag = 1;
+                } else {
+                        mssp->xa_flag = 0;
+                }
+                return 1;
+        }
+        return 0;
+}
+
+int cm206_get_upc(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
+{
+        uch upc[10];
+        char *ret = mcn->medium_catalog_number;
+        int i;
+
+        if (type_1_command(c_read_upc, 10, upc))
+                return -EIO;
+        for (i = 0; i < 13; i++) {
+                int w = i / 2 + 1, r = i % 2;
+                if (r)
+                        ret[i] = 0x30 | (upc[w] & 0x0f);
+                else
+                        ret[i] = 0x30 | ((upc[w] >> 4) & 0x0f);
+        }
+        ret[13] = '\0';
+        return 0;
+}
+
+int cm206_reset(struct cdrom_device_info *cdi)
+{
+        stop_read();
+        reset_cm260();
+        outw(dc_normal | dc_break | READ_AHEAD, r_data_control);
+        mdelay(1);              /* 750 musec minimum */
+        outw(dc_normal | READ_AHEAD, r_data_control);
+        cd->sector_last = -1;   /* flag no data buffered */
+        cd->adapter_last = -1;
+        invalidate_toc();
+        return 0;
+}
+
+int cm206_select_speed(struct cdrom_device_info *cdi, int speed)
+{
+        int r;
+        switch (speed) {
+        case 0:
+                r = type_0_command(c_auto_mode, 1);
+                break;
+        case 1:
+                r = type_0_command(c_force_1x, 1);
+                break;
+        case 2:
+                r = type_0_command(c_force_2x, 1);
+                break;
+        default:
+                return -1;
+        }
+        if (r < 0)
+                return r;
+        else
+                return 1;
+}
+
+static struct cdrom_device_ops cm206_dops = {
+        .open                   = cm206_open,
+        .release                = cm206_release,
+        .drive_status           = cm206_drive_status,
+        .media_changed          = cm206_media_changed,
+        .tray_move              = cm206_tray_move,
+        .lock_door              = cm206_lock_door,
+        .select_speed           = cm206_select_speed,
+        .get_last_session       = cm206_get_last_session,
+        .get_mcn                = cm206_get_upc,
+        .reset                  = cm206_reset,
+        .audio_ioctl            = cm206_audio_ioctl,
+        .dev_ioctl              = cm206_ioctl,
+        .capability             = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
+                                  CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+                                  CDC_MCN | CDC_PLAY_AUDIO | CDC_SELECT_SPEED |
+                                  CDC_IOCTLS | CDC_DRIVE_STATUS,
+        .n_minors               = 1,
+};
+
+
+static struct cdrom_device_info cm206_info = {
+        .ops            = &cm206_dops,
+        .speed          = 2,
+        .capacity       = 1,
+        .name           = "cm206",
+};
+
+static int cm206_block_open(struct inode *inode, struct file *file)
+{
+        return cdrom_open(&cm206_info, inode, file);
+}
+
+static int cm206_block_release(struct inode *inode, struct file *file)
+{
+        return cdrom_release(&cm206_info, file);
+}
+
+static int cm206_block_ioctl(struct inode *inode, struct file *file,
+                                unsigned cmd, unsigned long arg)
+{
+        return cdrom_ioctl(file, &cm206_info, inode, cmd, arg);
+}
+
+static int cm206_block_media_changed(struct gendisk *disk)
+{
+        return cdrom_media_changed(&cm206_info);
+}
+
+static struct block_device_operations cm206_bdops =
+{
+        .owner          = THIS_MODULE,
+        .open           = cm206_block_open,
+        .release        = cm206_block_release,
+        .ioctl          = cm206_block_ioctl,
+        .media_changed  = cm206_block_media_changed,
+};
+
+static struct gendisk *cm206_gendisk;
+
+/* This function probes for the adapter card. It returns the base
+   address if it has found the adapter card. One can specify a base 
+   port to probe specifically, or 0 which means span all possible
+   bases. 
+
+   Linus says it is too dangerous to use writes for probing, so we
+   stick with pure reads for a while. Hope that 8 possible ranges,
+   request_region, 15 bits of one port and 6 of another make things
+   likely enough to accept the region on the first hit...
+ */
+int __init probe_base_port(int base)
+{
+        int b = 0x300, e = 0x370;       /* this is the range of start addresses */
+        volatile int fool, i;
+
+        if (base)
+                b = e = base;
+        for (base = b; base <= e; base += 0x10) {
+                if (!request_region(base, 0x10,"cm206"))
+                        continue;
+                for (i = 0; i < 3; i++)
+                        fool = inw(base + 2);   /* empty possibly uart_receive_buffer */
+                if ((inw(base + 6) & 0xffef) != 0x0001 ||       /* line_status */
+                    (inw(base) & 0xad00) != 0)  { /* data status */
+                        release_region(base,0x10);
+                        continue;
+                }
+                return (base);
+        }
+        return 0;
+}
+
+#if !defined(MODULE) || defined(AUTO_PROBE_MODULE)
+/* Probe for irq# nr. If nr==0, probe for all possible irq's. */
+int __init probe_irq(int nr)
+{
+        int irqs, irq;
+        outw(dc_normal | READ_AHEAD, r_data_control);   /* disable irq-generation */
+        sti();
+        irqs = probe_irq_on();
+        reset_cm260();          /* causes interrupt */
+        udelay(100);            /* wait for it */
+        irq = probe_irq_off(irqs);
+        outw(dc_normal | READ_AHEAD, r_data_control);   /* services interrupt */
+        if (nr && irq != nr && irq > 0)
+                return 0;       /* wrong interrupt happened */
+        else
+                return irq;
+}
+#endif
+
+int __init cm206_init(void)
+{
+        uch e = 0;
+        long int size = sizeof(struct cm206_struct);
+        struct gendisk *disk;
+
+        printk(KERN_INFO "cm206 cdrom driver " REVISION);
+        cm206_base = probe_base_port(auto_probe ? 0 : cm206_base);
+        if (!cm206_base) {
+                printk(" can't find adapter!\n");
+                return -EIO;
+        }
+        printk(" adapter at 0x%x", cm206_base);
+        cd = (struct cm206_struct *) kmalloc(size, GFP_KERNEL);
+        if (!cd)
+               goto out_base;
+        /* Now we have found the adaptor card, try to reset it. As we have
+         * found out earlier, this process generates an interrupt as well,
+         * so we might just exploit that fact for irq probing! */
+#if !defined(MODULE) || defined(AUTO_PROBE_MODULE)
+        cm206_irq = probe_irq(auto_probe ? 0 : cm206_irq);
+        if (cm206_irq <= 0) {
+                printk("can't find IRQ!\n");
+                goto out_probe;
+        } else
+                printk(" IRQ %d found\n", cm206_irq);
+#else
+        cli();
+        reset_cm260();
+        /* Now, the problem here is that reset_cm260 can generate an
+           interrupt. It seems that this can cause a kernel oops some time
+           later. So we wait a while and `service' this interrupt. */
+        mdelay(1);
+        outw(dc_normal | READ_AHEAD, r_data_control);
+        sti();
+        printk(" using IRQ %d\n", cm206_irq);
+#endif
+        if (send_receive_polled(c_drive_configuration) !=
+            c_drive_configuration) {
+                printk(KERN_INFO " drive not there\n");
+                goto out_probe;
+        }
+        e = send_receive_polled(c_gimme);
+        printk(KERN_INFO "Firmware revision %d", e & dcf_revision_code);
+        if (e & dcf_transfer_rate)
+                printk(" double");
+        else
+                printk(" single");
+        printk(" speed drive");
+        if (e & dcf_motorized_tray)
+                printk(", motorized tray");
+        if (request_irq(cm206_irq, cm206_interrupt, 0, "cm206", NULL)) {
+                printk("\nUnable to reserve IRQ---aborted\n");
+                goto out_probe;
+        }
+        printk(".\n");
+
+        if (register_blkdev(MAJOR_NR, "cm206"))
+                goto out_blkdev;
+
+        disk = alloc_disk(1);
+        if (!disk)
+                goto out_disk;
+        disk->major = MAJOR_NR;
+        disk->first_minor = 0;
+        sprintf(disk->disk_name, "cm206cd");
+        disk->fops = &cm206_bdops;
+        disk->flags = GENHD_FL_CD;
+        cm206_gendisk = disk;
+        if (register_cdrom(&cm206_info) != 0) {
+                printk(KERN_INFO "Cannot register for cdrom %d!\n", MAJOR_NR);
+                goto out_cdrom;
+        }
+        cm206_queue = blk_init_queue(do_cm206_request, &cm206_lock);
+        if (!cm206_queue)
+                goto out_queue;
+                
+        blk_queue_hardsect_size(cm206_queue, 2048);
+        disk->queue = cm206_queue;
+        add_disk(disk);
+
+        memset(cd, 0, sizeof(*cd));     /* give'm some reasonable value */
+        cd->sector_last = -1;   /* flag no data buffered */
+        cd->adapter_last = -1;
+        init_timer(&cd->timer);
+        cd->timer.function = cm206_timeout;
+        cd->max_sectors = (inw(r_data_status) & ds_ram_size) ? 24 : 97;
+        printk(KERN_INFO "%d kB adapter memory available, "
+               " %ld bytes kernel memory used.\n", cd->max_sectors * 2,
+               size);
+        return 0;
+
+out_queue:
+        unregister_cdrom(&cm206_info);
+out_cdrom:
+        put_disk(disk);
+out_disk:
+        unregister_blkdev(MAJOR_NR, "cm206");
+out_blkdev:
+        free_irq(cm206_irq, NULL);
+out_probe:
+        kfree(cd);
+out_base:
+        release_region(cm206_base, 16);
+        return -EIO;
+}
+
+#ifdef MODULE
+
+
+static void __init parse_options(void)
+{
+        int i;
+        for (i = 0; i < 2; i++) {
+                if (0x300 <= cm206[i] && i <= 0x370
+                    && cm206[i] % 0x10 == 0) {
+                        cm206_base = cm206[i];
+                        auto_probe = 0;
+                } else if (3 <= cm206[i] && cm206[i] <= 15) {
+                        cm206_irq = cm206[i];
+                        auto_probe = 0;
+                }
+        }
+}
+
+int __cm206_init(void)
+{
+        parse_options();
+#if !defined(AUTO_PROBE_MODULE)
+        auto_probe = 0;
+#endif
+        return cm206_init();
+}
+
+void __exit cm206_exit(void)
+{
+        del_gendisk(cm206_gendisk);
+        put_disk(cm206_gendisk);
+        if (unregister_cdrom(&cm206_info)) {
+                printk("Can't unregister cdrom cm206\n");
+                return;
+        }
+        if (unregister_blkdev(MAJOR_NR, "cm206")) {
+                printk("Can't unregister major cm206\n");
+                return;
+        }
+        blk_cleanup_queue(cm206_queue);
+        free_irq(cm206_irq, NULL);
+        kfree(cd);
+        release_region(cm206_base, 16);
+        printk(KERN_INFO "cm206 removed\n");
+}
+
+module_init(__cm206_init);
+module_exit(cm206_exit);
+
+#else                           /* !MODULE */
+
+/* This setup function accepts either `auto' or numbers in the range
+ * 3--11 (for irq) or 0x300--0x370 (for base port) or both. */
+
+static int __init cm206_setup(char *s)
+{
+        int i, p[4];
+
+        (void) get_options(s, ARRAY_SIZE(p), p);
+
+        if (!strcmp(s, "auto"))
+                auto_probe = 1;
+        for (i = 1; i <= p[0]; i++) {
+                if (0x300 <= p[i] && i <= 0x370 && p[i] % 0x10 == 0) {
+                        cm206_base = p[i];
+                        auto_probe = 0;
+                } else if (3 <= p[i] && p[i] <= 15) {
+                        cm206_irq = p[i];
+                        auto_probe = 0;
+                }
+        }
+        return 1;
+}
+
+__setup("cm206=", cm206_setup);
+
+#endif                          /* !MODULE */
+MODULE_ALIAS_BLOCKDEV_MAJOR(CM206_CDROM_MAJOR);
+
+/*
+ * Local variables:
+ * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -DMODULE -DMODVERSIONS -include /usr/src/linux/include/linux/modversions.h  -c -o cm206.o cm206.c"
+ * End:
+ */