patch-2.1.33 linux/drivers/scsi/ppa.c
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- Lines: 1807
- Date:
Wed Apr 9 21:30:31 1997
- Orig file:
v2.1.32/linux/drivers/scsi/ppa.c
- Orig date:
Fri Dec 27 02:03:23 1996
diff -u --recursive --new-file v2.1.32/linux/drivers/scsi/ppa.c linux/drivers/scsi/ppa.c
@@ -1,504 +1,1326 @@
-/* ppa.c -- low level driver for the IOMEGA PPA3
- parallel port SCSI host adapter.
-
- (The PPA3 is the embedded controller in the ZIP drive.)
-
- (c) 1995,1996 Grant R. Guenther, grant@torque.net,
- under the terms of the GNU Public License.
-
-*/
+/* ppa.c -- low level driver for the IOMEGA PPA3
+ * parallel port SCSI host adapter.
+ *
+ * (The PPA3 is the embedded controller in the ZIP drive.)
+ *
+ * (c) 1995,1996 Grant R. Guenther, grant@torque.net,
+ * under the terms of the GNU Public License.
+ *
+ */
/* This driver was developed without the benefit of any technical
- specifications for the interface. Instead, a modified version of
- DOSemu was used to monitor the protocol used by the DOS driver
- for this adapter. I have no idea how my programming model relates
- to IOMEGA's design.
-
- IOMEGA's driver does not generate linked commands. I've never
- observed a SCSI message byte in the protocol transactions, so
- I am assuming that as long as linked commands are not used
- we won't see any.
-
- So far, this driver has been tested with the embedded PPA3 in the
- ZIP drive, only. It can detect and adapt to 4- and 8-bit parallel
- ports, but there is currently no support for EPP or ECP ports, as
- I have been unable to make the DOS drivers work in these modes on
- my test rig.
-
- For more information, see the file drivers/scsi/README.ppa.
-
-*/
-
-#define PPA_VERSION "0.26"
-
-/* Change these variables here or with insmod or with a LILO or LOADLIN
- command line argument
-*/
-
-static int ppa_base = 0x378; /* parallel port address */
-static int ppa_speed_high = 1; /* port delay in data phase */
-static int ppa_speed_low = 6; /* port delay otherwise */
-static int ppa_nybble = 0; /* don't force nybble mode */
-
-
-#define PPA_CAN_QUEUE 1 /* use "queueing" interface */
-#define PPA_SELECT_TMO 5000 /* how long to wait for target ? */
-#define PPA_SPIN_TMO 5000000 /* ppa_wait loop limiter */
-#define PPA_SECTOR_SIZE 512 /* for a performance hack only */
-
-#include <linux/stddef.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/tqueue.h>
-#include <linux/ioport.h>
-#include <linux/delay.h>
-#include <linux/blk.h>
-#include <linux/proc_fs.h>
-#include <linux/stat.h>
-#include <asm/io.h>
-#include "sd.h"
-#include "hosts.h"
-#include "ppa.h"
-
-struct proc_dir_entry proc_scsi_ppa =
- { PROC_SCSI_PPA, 3, "ppa", S_IFDIR|S_IRUGO|S_IXUGO, 2 };
-
-static int ppa_abort_flag = 0;
-static int ppa_error_code = DID_OK;
-static char ppa_info_string[132];
-static Scsi_Cmnd *ppa_current = 0;
-static void (*ppa_done) (Scsi_Cmnd *);
-static int ppa_port_delay;
-
-void out_p( short port, char byte)
-
-{ outb(byte,ppa_base+port);
- udelay(ppa_port_delay);
-}
-
-char in_p( short port)
-
-{ return inb(ppa_base+port);
- udelay(ppa_port_delay);
-}
-
-void ppa_d_pulse( char b )
-
-{ out_p(0,b);
- out_p(2,0xc); out_p(2,0xe); out_p(2,0xc); out_p(2,0x4); out_p(2,0xc);
-}
-
-void ppa_disconnect( void )
-
-{ ppa_d_pulse(0);
- ppa_d_pulse(0x3c);
- ppa_d_pulse(0x20);
- ppa_d_pulse(0xf);
-}
-
-void ppa_c_pulse( char b )
-
-{ out_p(0,b);
- out_p(2,0x4); out_p(2,0x6); out_p(2,0x4); out_p(2,0xc);
-}
-
-void ppa_connect( void )
-
-{ ppa_c_pulse(0);
- ppa_c_pulse(0x3c);
- ppa_c_pulse(0x20);
- ppa_c_pulse(0x8f);
-}
-
-void ppa_do_reset( void )
-
-{ out_p(2,0); /* This is really just a guess */
- udelay(100);
-}
-
-char ppa_select( int initiator, int target )
-
-{ char r;
- int k;
-
- r = in_p(1);
- out_p(0,(1<<target)); out_p(2,0xe); out_p(2,0xc);
- out_p(0,(1<<initiator)); out_p(2,0x8);
+ * specifications for the interface. Instead, a modified version of
+ * DOSemu was used to monitor the protocol used by the DOS driver
+ * for this adapter. I have no idea how my programming model relates
+ * to IOMEGA's design.
+ *
+ * IOMEGA's driver does not generate linked commands. I've never
+ * observed a SCSI message byte in the protocol transactions, so
+ * I am assuming that as long as linked commands are not used
+ * we won't see any.
+ *
+ * For more information, see the file drivers/scsi/README.ppa.
+ *
+ */
+
+/*
+ * this driver has been hacked by Matteo Frigo (athena@theory.lcs.mit.edu)
+ * to support EPP and scatter-gather. [0.26-athena]
+ *
+ * additional hacks by David Campbell (campbell@tirian.che.curtin.edu.au)
+ * in response to this driver "mis-behaving" on his machine.
+ * Fixed EPP to handle "software" changing of EPP port data direction.
+ * Chased down EPP timeouts
+ * Made this driver "kernel version friendly" [0.28-athena]
+ *
+ * Really hacked it out of existance (David Campbell)
+ * EPP timeouts no longer occur (yet better handling)
+ * Probes known parallel ports
+ * Autodetects EPP / ECP / PS2 / NIBBLE
+ * Support for multiple devices (does anyone need this??)
+ * [0.29-Curtin]
+ * [ Stuff removed ]
+ *
+ * Modified PEDANTIC for less PEDANTIC drivers as people
+ * were complaining about speed (I received a report indicating
+ * that PEDANTIC is necessary for WinBond chipsets.
+ * Updated config_ppa and Makefile
+ * [0.36b-Curtin]
+ *
+ * First round of cleanups
+ * Remove prior 1.3.34 kernel support
+ * SMC support changed
+ * ECP+EPP detection always invoked.
+ * If compat mode => PS/2
+ * else ecp_sync() called (ECP+EPP uses FIFO).
+ * Added routine to detect interrupt channel for ECP (not used)
+ * Changed version numbering
+ * 1 Major number
+ * 00 Minor revision number
+ * ALPHA Expected stability (alpha, beta, stable)
+ * [Curtin-1-00-ALPHA]
+ * Second round of cleanups
+ * Clean up timer queues
+ * Fixed problem with non-detection of PS/2 ports
+ * SMC ECP+EPP confirmed to work, remove option from config_ppa
+ * [Curtin-1-01-ALPHA]
+ *
+ * Parport hits with a vengance!!
+ * Several internal revisions have been made with huge amounts of
+ * fixes including:
+ * ioport_2_hostno removed (unique_id is quicker)
+ * SMC compat option is history
+ * Driver name / info hardwired
+ * Played with inlines and saved 4k on module
+ * Parport support
+ * Using PnP Parport allows use of printer attached to
+ * ZIP drive.
+ * Numerous fixups for device registration and to allow
+ * proper aborts.
+ * Version jumps a few numbers here - considered BETA
+ * Shipping Parport with monolithic driver :)
+ * [Curtin-1-05-BETA]
+ *
+ * Fixed code to ensure SCSI abort will release the SCSI command
+ * if the driver is STILL trying to claim the parport (PNP ver)
+ * Now I have to fix the lp driver then there will NEVER be a
+ * problem.
+ * Got around to doing the ppa_queuecommand() clean up
+ * Fixed bug relating to SMC EPP+ECP and monolithic driver
+ * [Curtin-1-06-BETA]
+ *
+ * Where did the ppa_setup() code disappear to ??
+ * Back in now...
+ * Distribution of ppa now independent of parport (less work for me).
+ * Also cleaned up the port detection to allow for variations on
+ * IO aliasing (in an attempt to fix a few problems with some
+ * machines...)
+ * [Curtin-1-07-BETA]
+ *
+ * Rewrote detection code for monolithic driver and ported changes to
+ * parport driver. Result is more stable detection of hardware and
+ * better immunity to port aliasing (old XT cards).
+ * Parport 0.16 (or better) is required for parport operation and
+ * ECP+EPP modes, otherwise the latest parport edition is recommended.
+ *
+ * When using EPP and writing to disk CPU usage > 40%, while reading <10%.
+ * This is due to ZIP drive IO scheduling, the drive does a verify after
+ * write to ensure data integrity (removable media is ALWAYS questionable
+ * since you never know where it has been).
+ * Some fancy programing *MAY* fix the problem but at 30 Mb/min is just
+ * over 10 sectors per jiffy.
+ *
+ * Hmm... I think I know a way but it will send the driver into
+ * ALPHA state again.
+ * [Curtin-1-08-STABLE]
+ */
- k = 0;
- while ( !(r = (in_p(1) & 0xf0)) && (k++ < PPA_SELECT_TMO)) barrier();
- return r;
-}
-
-char ppa_wait( void )
-
-/* Wait for the high bit to be set.
-
- In principle, this could be tied to an interrupt, but the adapter
- doesn't appear to be designed to support interrupts. We spin on
- the 0x80 ready bit.
-*/
-
-{ int k;
- char r;
-
- ppa_error_code = DID_OK;
- k = 0;
- while (!((r = in_p(1)) & 0x80)
- && (k++ < PPA_SPIN_TMO) && !ppa_abort_flag ) barrier();
-
- if (ppa_abort_flag) {
- if (ppa_abort_flag == 1) ppa_error_code = DID_ABORT;
- else { ppa_do_reset();
- ppa_error_code = DID_RESET;
- }
- ppa_disconnect();
- return 0;
- }
- if (k >= PPA_SPIN_TMO) {
- ppa_error_code = DID_TIME_OUT;
- ppa_disconnect();
- return 0; /* command timed out */
- }
- return (r & 0xf0);
-}
-
-int ppa_init( void )
-
-/* This is based on a trace of what the Iomega DOS 'guest' driver does.
- I've tried several different kinds of parallel ports with guest and
- coded this to react in the same ways that it does.
-
- The return value from this function is just a hint about where the
- handshaking failed.
-
-*/
-
-{ char r, s;
-
- out_p(0,0xaa);
- if (in_p(0) != (char) 0xaa) return 1;
- ppa_disconnect();
- ppa_connect();
- out_p(2,0x6);
- if ((in_p(1) & 0xf0) != 0xf0) return 2;
- out_p(2,0x4);
- if ((in_p(1) & 0xf0) != 0x80) return 3;
- ppa_disconnect();
- s = in_p(2);
- out_p(2,0xec);
- out_p(0,0x55);
- r = in_p(0);
- if (r != (char) 0xff) {
- ppa_nybble = 1;
- if (r != (char) 0x55) return 4;
- out_p(0,0xaa); if (in_p(0) != (char) 0xaa) return 5;
- }
- out_p(2,s);
- ppa_connect();
- out_p(0,0x40); out_p(2,0x8); out_p(2,0xc);
- ppa_disconnect();
-
- return 0;
-}
-
-int ppa_start( Scsi_Cmnd * cmd )
-
-{ int k;
-
- ppa_error_code = DID_OK;
- ppa_abort_flag = 0;
-
- if (cmd->target == PPA_INITIATOR) {
- ppa_error_code = DID_BAD_TARGET;
- return 0;
- }
- ppa_connect();
- if (!ppa_select(PPA_INITIATOR,cmd->target)) {
- ppa_disconnect();
- ppa_error_code = DID_NO_CONNECT;
- return 0;
- }
- out_p(2,0xc);
-
- for (k=0; k < cmd->cmd_len; k++) { /* send the command */
- if (!ppa_wait()) return 0;
- out_p(0,cmd->cmnd[k]);
- out_p(2,0xe);
- out_p(2,0xc);
- }
+/* The following #define is to avoid a clash with hosts.c */
+#define PPA_CODE 1
+#include "ppa.h"
+/* batteries not included :-) */
-#ifdef PPA_DEBUG
- printk("PPA: command out: ");
- for (k=0; k < cmd->cmd_len; k++)
- printk("%3x",(cmd->cmnd[k]) & 0xff );
- printk("\n");
+/*
+ * modes in which the driver can operate
+ */
+#define PPA_AUTODETECT 0 /* Autodetect mode */
+#define PPA_NIBBLE 1 /* work in standard 4 bit mode */
+#define PPA_PS2 2 /* PS/2 byte mode */
+#define PPA_EPP_8 3 /* EPP mode, 8 bit */
+#define PPA_EPP_16 4 /* EPP mode, 16 bit */
+#define PPA_EPP_32 5 /* EPP mode, 32 bit */
+#define PPA_UNKNOWN 6 /* Just in case... */
+
+static char *PPA_MODE_STRING[] =
+{
+ "Autodetect",
+ "SPP",
+ "PS/2",
+ "EPP 8 bit",
+ "EPP 16 bit",
+ "EPP 32 bit",
+ "Unknown"};
+
+typedef struct {
+ struct ppd *dev; /* Parport device entry */
+ int speed; /* General PPA delay constant */
+ int speed_fast; /* Const for nibble/byte modes */
+ int epp_speed; /* Reset time period */
+ int mode; /* Transfer mode */
+ int timeout; /* Number of timeouts */
+ int host; /* Host number (for proc) */
+ int abort_flag; /* Abort flag */
+ int error_code; /* Error code */
+ int ppa_failed; /* Failure flag */
+ Scsi_Cmnd *cur_cmd; /* Current queued command */
+ void (*done) (Scsi_Cmnd *); /* Done func for queuecommand */
+ struct tq_struct ppa_tq; /* Polling interupt stuff */
+ struct wait_queue *ppa_wait_q; /* Used for PnP stuff */
+} ppa_struct;
+
+static void ppa_interrupt(void *data);
+/* I know that this is a mess but it works!! */
+#define NO_HOSTS 4
+static ppa_struct ppa_hosts[NO_HOSTS] =
+{
+ {0, 6, 1, CONFIG_SCSI_PPA_EPP_TIME, PPA_AUTODETECT, 0, -1, 0, DID_ERROR, 1, NULL, NULL,
+ {0, 0, ppa_interrupt, NULL}, NULL},
+ {0, 6, 1, CONFIG_SCSI_PPA_EPP_TIME, PPA_AUTODETECT, 0, -1, 0, DID_ERROR, 1, NULL, NULL,
+ {0, 0, ppa_interrupt, NULL}, NULL},
+ {0, 6, 1, CONFIG_SCSI_PPA_EPP_TIME, PPA_AUTODETECT, 0, -1, 0, DID_ERROR, 1, NULL, NULL,
+ {0, 0, ppa_interrupt, NULL}, NULL},
+ {0, 6, 1, CONFIG_SCSI_PPA_EPP_TIME, PPA_AUTODETECT, 0, -1, 0, DID_ERROR, 1, NULL, NULL,
+ {0, 0, ppa_interrupt, NULL}, NULL}
+};
+
+/* This is a global option */
+static int ppa_speed = -1; /* Set to >0 to act as a global value */
+static int ppa_speed_fast = -1; /* ditto.. */
+static int ppa_sg = SG_ALL; /* enable/disable scatter-gather. */
+
+/* other options */
+#define PPA_CAN_QUEUE 1 /* use "queueing" interface */
+#define PPA_BURST_SIZE 512 /* block size for bulk transfers */
+#define PPA_SELECT_TMO 5000 /* how long to wait for target ? */
+#define PPA_SPIN_TMO 500000 /* ppa_wait loop limiter */
+
+#define IN_EPP_MODE(x) (x == PPA_EPP_8 || x == PPA_EPP_16 || x == PPA_EPP_32)
+
+/* args to ppa_connect */
+#define CONNECT_EPP_MAYBE 1
+#define CONNECT_NORMAL 0
+
+#define PPA_BASE(x) ppa_hosts[(x)].dev->port->base
+
+/* Port IO - Sorry Grant but I prefer the following symbols */
+#define r_dtr(x) inb(PPA_BASE(x))
+#define r_str(x) inb(PPA_BASE(x)+1)
+#define r_ctr(x) inb(PPA_BASE(x)+2)
+#define r_epp(x) inb(PPA_BASE(x)+4)
+#define r_fifo(x) inb(PPA_BASE(x)+0x400)
+#define r_ecr(x) inb(PPA_BASE(x)+0x402)
+
+#define w_dtr(x,y) outb(y, PPA_BASE(x))
+#define w_str(x,y) outb(y, PPA_BASE(x)+1)
+#define w_ctr(x,y) outb(y, PPA_BASE(x)+2);\
+ udelay( ppa_hosts[(x)].speed)
+#define w_epp(x,y) outb(y, PPA_BASE(x)+4)
+#define w_fifo(x,y) outb(y, PPA_BASE(x)+0x400)
+#define w_ecr(x,y) outb(y, PPA_BASE(x)+0x402)
+
+int ppa_wakeup(void *ref)
+{
+ ppa_struct *ppa_dev = (ppa_struct *) ref;
+
+ if (!ppa_dev->ppa_wait_q)
+ return 1; /* Wake up whom ? */
+
+ /* Claim the Parport */
+ if (parport_claim(ppa_dev->dev))
+ return 1; /* Shouldn't happen */
+
+ wake_up(&ppa_dev->ppa_wait_q);
+ return 0;
+}
+
+int ppa_release(struct Scsi_Host *host)
+{
+ int host_no = host->unique_id;
+
+ printk("Releasing ppa%i\n", host_no);
+ parport_unregister_device(ppa_hosts[host_no].dev);
+ return 0;
+}
+
+static int ppa_pb_claim(int host_no)
+{
+ if (parport_claim(ppa_hosts[host_no].dev)) {
+ sleep_on(&ppa_hosts[host_no].ppa_wait_q);
+ ppa_hosts[host_no].ppa_wait_q = NULL;
+
+ /* Check to see if we were aborted or reset */
+ if (ppa_hosts[host_no].dev->port->cad !=
+ ppa_hosts[host_no].dev) {
+ printk("Abort detected on ppa%i\n", host_no);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void ppa_pb_release(int host_no)
+{
+ parport_release(ppa_hosts[host_no].dev);
+}
+
+
+/* Placed here so everyone knows what ecp_sync does.. */
+static void ecp_sync(int host_no)
+{
+ int i, r;
+
+ r = r_ecr(host_no);
+ if ((r & 0xe0) != 0x80)
+ return;
+
+ for (i = 0; i < 100; i++) {
+ r = r_ecr(host_no);
+ if (r & 0x01)
+ return;
+ udelay(5);
+ }
+
+ printk("ppa: ECP sync failed as data still present in FIFO.\n");
+}
+
+static inline void ppa_d_pulse(int host_no, char b)
+{
+ w_dtr(host_no, b);
+ w_ctr(host_no, 0xc);
+ w_ctr(host_no, 0xe);
+ w_ctr(host_no, 0xc);
+ w_ctr(host_no, 0x4);
+ w_ctr(host_no, 0xc);
+}
+
+static void ppa_disconnect(int host_no)
+{
+ ppa_d_pulse(host_no, 0);
+ ppa_d_pulse(host_no, 0x3c);
+ ppa_d_pulse(host_no, 0x20);
+ ppa_d_pulse(host_no, 0xf);
+
+ ppa_pb_release(host_no);
+}
+
+static inline void ppa_c_pulse(int host_no, char b)
+{
+ w_dtr(host_no, b);
+ w_ctr(host_no, 0x4);
+ w_ctr(host_no, 0x6);
+ w_ctr(host_no, 0x4);
+ w_ctr(host_no, 0xc);
+}
+
+static int ppa_connect(int host_no, int flag)
+{
+ int retv = ppa_pb_claim(host_no);
+
+ ppa_c_pulse(host_no, 0);
+ ppa_c_pulse(host_no, 0x3c);
+ ppa_c_pulse(host_no, 0x20);
+ if ((flag == CONNECT_EPP_MAYBE) &&
+ IN_EPP_MODE(ppa_hosts[host_no].mode))
+ ppa_c_pulse(host_no, 0xcf);
+ else
+ ppa_c_pulse(host_no, 0x8f);
+
+ return retv;
+}
+
+static void ppa_do_reset(int host_no)
+{
+ /*
+ * SCSI reset taken from ppa_init and checked with
+ * Iomega document that Grant has (via email :(
+ */
+ ppa_pb_claim(host_no);
+ ppa_disconnect(host_no);
+
+ ppa_connect(host_no, CONNECT_NORMAL);
+
+ w_ctr(host_no, 0x6);
+ w_ctr(host_no, 0x4);
+ w_dtr(host_no, 0x40);
+ w_ctr(host_no, 0x8);
+ udelay(50);
+ w_ctr(host_no, 0xc);
+
+ ppa_disconnect(host_no);
+}
+
+static char ppa_select(int host_no, int initiator, int target)
+{
+ char r;
+ int k;
+
+ r = r_str(host_no); /* TODO */
+
+ w_dtr(host_no, (1 << target));
+ w_ctr(host_no, 0xe);
+ w_ctr(host_no, 0xc);
+ w_dtr(host_no, (1 << initiator));
+ w_ctr(host_no, 0x8);
+
+ k = 0;
+ while (!(r = (r_str(host_no) & 0xf0)) && (k++ < PPA_SELECT_TMO))
+ barrier();
+
+ if (k >= PPA_SELECT_TMO)
+ return 0;
+
+ return r;
+}
+
+static void ppa_fail(int host_no, int error_code)
+{
+ ppa_hosts[host_no].error_code = error_code;
+ ppa_hosts[host_no].ppa_failed = 1;
+ ppa_disconnect(host_no);
+}
+
+/*
+ * Wait for the high bit to be set.
+ *
+ * In principle, this could be tied to an interrupt, but the adapter
+ * doesn't appear to be designed to support interrupts. We spin on
+ * the 0x80 ready bit.
+ */
+static char ppa_wait(int host_no)
+{
+ int k;
+ char r;
+
+ k = 0;
+ while (!((r = r_str(host_no)) & 0x80)
+ && (k++ < PPA_SPIN_TMO) && !ppa_hosts[host_no].abort_flag)
+ barrier();
+
+ /* check if we were interrupted */
+ if (ppa_hosts[host_no].abort_flag) {
+ if (ppa_hosts[host_no].abort_flag == 1)
+ ppa_fail(host_no, DID_ABORT);
+ else {
+ ppa_do_reset(host_no);
+ ppa_fail(host_no, DID_RESET);
+ }
+ return 0;
+ }
+ /* check if timed out */
+ if (k >= PPA_SPIN_TMO) {
+ ppa_fail(host_no, DID_TIME_OUT);
+ return 0; /* command timed out */
+ }
+ /*
+ * return some status information.
+ * Semantics: 0xc0 = ZIP wants more data
+ * 0xd0 = ZIP wants to send more data
+ * 0xf0 = end of transfer, ZIP is sending status
+ */
+ return (r & 0xf0);
+}
+
+
+/*
+ * This is based on a trace of what the Iomega DOS 'guest' driver does.
+ * I've tried several different kinds of parallel ports with guest and
+ * coded this to react in the same ways that it does.
+ *
+ * The return value from this function is just a hint about where the
+ * handshaking failed.
+ *
+ */
+static int ppa_init(int host_no)
+{
+ if (ppa_pb_claim(host_no))
+ return 1;
+ ppa_disconnect(host_no);
+
+ ppa_connect(host_no, CONNECT_NORMAL);
+
+ w_ctr(host_no, 0x6);
+ if ((r_str(host_no) & 0xf0) != 0xf0) {
+ ppa_pb_release(host_no);
+ return 2;
+ }
+ w_ctr(host_no, 0x4);
+ if ((r_str(host_no) & 0xf0) != 0x80) {
+ ppa_pb_release(host_no);
+ return 3;
+ }
+ /* This is a SCSI reset signal */
+ w_dtr(host_no, 0x40);
+ w_ctr(host_no, 0x8);
+ udelay(50);
+ w_ctr(host_no, 0xc);
+
+ ppa_disconnect(host_no);
+
+ return 0;
+}
+
+/*
+ * check the epp status. After a EPP transfer, it should be true that
+ * 1) the TIMEOUT bit (SPP_STR.0) is clear
+ * 2) the READY bit (SPP_STR.7) is set
+ */
+static int ppa_check_epp_status(int host_no)
+{
+ char r;
+ r = r_str(host_no);
+
+ if (r & 1) {
+ /* EPP timeout, according to the PC87332 manual */
+ /* Semantics of clearing EPP timeout bit.
+ * PC87332 - reading SPP_STR does it...
+ * SMC - write 1 to EPP timeout bit
+ * Others - (???) write 0 to EPP timeout bit
+ */
+ w_str(host_no, r);
+ w_str(host_no, r & 0xfe);
+ ppa_hosts[host_no].timeout++;
+ printk("PPA: EPP timeout on port 0x%04x\n",
+ PPA_BASE(host_no));
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ }
+ if (!(r & 0x80)) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ return 1;
+}
+
+static inline int ppa_force_epp_byte(int host_no, char x)
+{
+/* This routine forces a byte down the EPP data port whether the
+ * device is ready or not...
+ */
+ char r;
+
+ w_epp(host_no, x);
+
+ r = r_str(host_no);
+ if (!(r & 1))
+ return 1;
+
+ if (ppa_hosts[host_no].epp_speed > 0) {
+ /* EPP timeout, according to the PC87332 manual */
+ /* Semantics of clearing EPP timeout bit.
+ * PC87332 - reading SPP_STR does it...
+ * SMC - write 1 to EPP timeout bit
+ * Others - (???) write 0 to EPP timeout bit
+ */
+ w_str(host_no, r);
+ w_str(host_no, r & 0xfe);
+
+ /* Take a deep breath, count to 10 and then... */
+ udelay(ppa_hosts[host_no].epp_speed);
+
+ /* Second time around */
+ w_epp(host_no, x);
+
+ r = r_str(host_no);
+ }
+ if (r & 1) {
+ w_str(host_no, r);
+ w_str(host_no, r & 0xfe);
+ ppa_hosts[host_no].timeout++;
+ printk("PPA: warning: EPP timeout\n");
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ } else
+ return 1;
+}
+
+static inline int ppa_send_command_epp(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ int k;
+
+ w_ctr(host_no, 0x4);
+ for (k = 0; k < cmd->cmd_len; k++) { /* send the command */
+ if (!ppa_force_epp_byte(host_no, cmd->cmnd[k]))
+ return 0;
+ }
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return 1;
+}
+
+static inline int ppa_send_command_normal(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ int k;
+
+ w_ctr(host_no, 0xc);
+
+ for (k = 0; k < cmd->cmd_len; k++) { /* send the command */
+ if (!ppa_wait(host_no))
+ return 0;
+ w_dtr(host_no, cmd->cmnd[k]);
+ w_ctr(host_no, 0xe);
+ w_ctr(host_no, 0xc);
+ }
+ return 1;
+}
+
+static int ppa_start(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+
+ /*
+ * by default, the command failed,
+ * unless explicitly completed in ppa_completion().
+ */
+ ppa_hosts[host_no].error_code = DID_ERROR;
+ ppa_hosts[host_no].abort_flag = 0;
+ ppa_hosts[host_no].ppa_failed = 0;
+
+ if (cmd->target == PPA_INITIATOR) {
+ ppa_hosts[host_no].error_code = DID_BAD_TARGET;
+ ppa_hosts[host_no].ppa_failed = 1;
+ return 0;
+ }
+ if (ppa_connect(host_no, CONNECT_EPP_MAYBE))
+ return 0;
+
+ if (!ppa_select(host_no, PPA_INITIATOR, cmd->target)) {
+ ppa_fail(host_no, DID_NO_CONNECT);
+ return 0;
+ }
+ if (IN_EPP_MODE(ppa_hosts[host_no].mode))
+ return ppa_send_command_epp(cmd);
+ else
+ return ppa_send_command_normal(cmd);
+}
+
+/*
+ * output a string, in whatever mode is available, according to the
+ * PPA protocol.
+ */
+static inline int ppa_outs(int host_no, char *buffer, int len)
+{
+ int k;
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 0
+ int r;
#endif
- return 1;
-}
-
-int ppa_completion( Scsi_Cmnd * cmd )
-
-/* The bulk flag enables some optimisations in the data transfer loops,
- it should be true for any command that transfers data in integral
- numbers of sectors.
-
- The driver appears to remain stable if we speed up the parallel port
- i/o in this function, but not elsewhere.
-*/
-
-{ char r, l, h, v;
- int dir, cnt, blen, fast, bulk;
- char *buffer;
-
-#ifdef PPA_DEBUG
- int k;
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ case PPA_PS2:
+ /* 8 bit output, with a loop */
+ for (k = len; k; k--) {
+ w_dtr(host_no, *buffer++);
+ w_ctr(host_no, 0xe);
+ w_ctr(host_no, 0xc);
+ }
+ return 1; /* assume transfer went OK */
+
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 0
+ case PPA_EPP_32:
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC < 2
+ w_ctr(host_no, 0x4);
+ for (k = len; k; k -= 4) {
+ w_epp(host_no, *buffer++);
+ w_epp(host_no, *buffer++);
+ w_epp(host_no, *buffer++);
+ w_epp(host_no, *buffer++);
+ r = ppa_check_epp_status(host_no);
+ if (!r)
+ return r;
+ }
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return 1;
#endif
-
- if (!(r = ppa_wait())) return 0;
- v = cmd->cmnd[0];
- bulk = ((v==READ_6)||(v==READ_10)||(v==WRITE_6)||(v==WRITE_10));
- buffer = cmd->request_buffer;
- blen = cmd->request_bufflen;
- cnt = 0; dir = 0;
- if (r == (char) 0xc0) dir = 1; /* d0 = read c0 = write f0 = status */
-
- ppa_port_delay = ppa_speed_high;
-
- while (r != (char) 0xf0) {
- if (((r & 0xc0) != 0xc0 ) || (cnt >= blen)) {
- ppa_disconnect();
- ppa_error_code = DID_ERROR;
- return 0;
- }
- fast = bulk && ((blen - cnt) >= PPA_SECTOR_SIZE);
- if (dir) do {
- out_p(0,buffer[cnt++]);
- out_p(2,0xe); out_p(2,0xc);
- if (!fast) break;
- } while (cnt % PPA_SECTOR_SIZE);
- else {
- if (ppa_nybble) do {
- out_p(2,0x4); h = in_p(1);
- out_p(2,0x6); l = in_p(1);
- v = ((l >> 4) & 0x0f) + (h & 0xf0);
- buffer[cnt++] = v;
- if (!fast) break;
- } while (cnt % PPA_SECTOR_SIZE);
- else do {
- out_p(2,0x25); v = in_p(0); out_p(2,0x27);
- buffer[cnt++] = v;
- if (!fast) break;
- } while (cnt % PPA_SECTOR_SIZE);
- if (!ppa_nybble) {
- out_p(2,0x5); out_p(2,0x4);
- }
- out_p(2,0xc);
- }
- if (!(r = ppa_wait())) return 0;
- }
-
- ppa_port_delay = ppa_speed_low;
-
- out_p(2,0x4); /* now read status byte */
- h = in_p(1);
- out_p(2,0x6);
- l = in_p(1);
- out_p(2,0xc);
- r = ((l >> 4) & 0x0f) + (h & 0xf0);
-
- out_p(2,0xe); out_p(2,0xc);
- ppa_disconnect();
-
-#ifdef PPA_DEBUG
- printk("PPA: status: %x, data[%d]: ",r & STATUS_MASK,cnt);
- if (cnt > 12) cnt = 12;
- for (k=0; k < cnt; k++)
- printk("%3x",buffer[k] & 0xff );
- printk("\n");
+ case PPA_EPP_16:
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC < 3
+ w_ctr(host_no, 0x4);
+ for (k = len; k; k -= 2) {
+ w_epp(host_no, *buffer++);
+ w_epp(host_no, *buffer++);
+ r = ppa_check_epp_status(host_no);
+ if (!r)
+ return r;
+ }
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return 1;
+#endif
+ case PPA_EPP_8:
+ w_ctr(host_no, 0x4);
+ for (k = len; k; k--) {
+ w_epp(host_no, *buffer++);
+ r = ppa_check_epp_status(host_no);
+ if (!r)
+ return r;
+ }
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return 1;
+#else
+ case PPA_EPP_32:
+ case PPA_EPP_16:
+ case PPA_EPP_8:
+ w_ctr(host_no, 0x4);
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_EPP_8:
+ outsb(PPA_BASE(host_no) + 0x04,
+ buffer, len);
+ break;
+ case PPA_EPP_16:
+ outsw(PPA_BASE(host_no) + 0x04,
+ buffer, len / 2);
+ break;
+ case PPA_EPP_32:
+ outsl(PPA_BASE(host_no) + 0x04,
+ buffer, len / 4);
+ break;
+ }
+ k = ppa_check_epp_status(host_no);
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return k;
#endif
- return (r & STATUS_MASK);
-}
-
-/* deprecated synchronous interface */
-
-int ppa_command( Scsi_Cmnd * cmd )
-
-{ int s;
-
- sti();
- s = 0;
- if (ppa_start(cmd))
- if (ppa_wait())
- s = ppa_completion(cmd);
- return s + (ppa_error_code << 16);
-}
-
-/* pseudo-interrupt queueing interface */
-
-/* Since the PPA itself doesn't generate interrupts, we use
- the scheduler's task queue to generate a stream of call-backs and
- complete the request when the drive is ready.
-*/
-
-static void ppa_interrupt( void *data);
-
-static struct tq_struct ppa_tq = {0,0,ppa_interrupt,NULL};
-
-static void ppa_interrupt( void *data)
-
-{ Scsi_Cmnd *cmd;
- void (*done) (Scsi_Cmnd *);
-
- cmd = ppa_current;
- done = ppa_done;
- if (!cmd) return;
-
- if (ppa_abort_flag) {
- ppa_disconnect();
- if(ppa_abort_flag == 1) cmd->result = DID_ABORT << 16;
- else { ppa_do_reset();
- cmd->result = DID_RESET << 16;
- }
- ppa_current = 0;
- done(cmd);
- return;
- }
- if (!( in_p(1) & 0x80)) {
- queue_task(&ppa_tq,&tq_scheduler);
- return;
- }
- cmd->result = ppa_completion(cmd) + (ppa_error_code << 16);
- ppa_current = 0;
- done(cmd);
- return;
-}
-
-int ppa_queuecommand( Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
-
-{ if (ppa_current) return 0;
- sti();
- ppa_current = cmd;
- ppa_done = done;
- if (!ppa_start(cmd)) {
- cmd->result = ppa_error_code << 16;
- ppa_current = 0;
- done(cmd);
- return 0;
- }
- queue_task(&ppa_tq,&tq_scheduler);
- return 0;
-}
-
-int ppa_detect( Scsi_Host_Template * host )
-
-{ struct Scsi_Host *hreg;
- int rs;
-
- /* can we have the ports ? */
-
- if (check_region(ppa_base,3)) {
- printk("PPA: ports at 0x%3x are not available\n",ppa_base);
- return 0;
- }
-
- /* attempt to initialise the controller */
-
- ppa_port_delay = ppa_speed_low;
-
- rs = ppa_init();
- if (rs) {
- printk("PPA: unable to initialise controller at 0x%x, error %d\n",
- ppa_base,rs);
- return 0;
- }
-
- /* now the glue ... */
-
- host->proc_dir = &proc_scsi_ppa;
-
- request_region(ppa_base,3,"ppa");
-
- host->can_queue = PPA_CAN_QUEUE;
-
- hreg = scsi_register(host,0);
- hreg->io_port = ppa_base;
- hreg->n_io_port = 3;
- hreg->dma_channel = -1;
-
- sprintf(ppa_info_string,
- "PPA driver version %s using %d-bit mode on port 0x%x.",
- PPA_VERSION,8-ppa_nybble*4,ppa_base);
- host->name = ppa_info_string;
-
- return 1; /* 1 host detected */
-}
-
-int ppa_biosparam( Disk * disk, kdev_t dev, int ip[])
-
-/* Apparently the the disk->capacity attribute is off by 1 sector
- for all disk drives. We add the one here, but it should really
- be done in sd.c. Even if it gets fixed there, this will still
- work.
-*/
-
-{ ip[0] = 0x40;
- ip[1] = 0x20;
- ip[2] = (disk->capacity +1) / (ip[0] * ip[1]);
- if (ip[2] > 1024) {
- ip[0] = 0xff;
- ip[1] = 0x3f;
- ip[2] = (disk->capacity +1) / (ip[0] * ip[1]);
- if (ip[2] > 1023)
- ip[2] = 1023;
- }
- return 0;
-}
-
-int ppa_abort( Scsi_Cmnd * cmd )
-
-{ ppa_abort_flag = 1;
- return SCSI_ABORT_SNOOZE;
-}
+ default:
+ printk("PPA: bug in ppa_outs()\n");
+ }
+ return 0;
+}
+
+static inline int ppa_outb(int host_no, char d)
+{
+ int k;
+
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ case PPA_PS2:
+ w_dtr(host_no, d);
+ w_ctr(host_no, 0xe);
+ w_ctr(host_no, 0xc);
+ return 1; /* assume transfer went OK */
+
+ case PPA_EPP_8:
+ case PPA_EPP_16:
+ case PPA_EPP_32:
+ w_ctr(host_no, 0x4);
+ w_epp(host_no, d);
+ k = ppa_check_epp_status(host_no);
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return k;
+
+ default:
+ printk("PPA: bug in ppa_outb()\n");
+ }
+ return 0;
+}
+
+static inline int ppa_ins(int host_no, char *buffer, int len)
+{
+ int k, h, l;
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 0
+ int r;
+#endif
-int ppa_reset( Scsi_Cmnd * cmd, unsigned int ignored )
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ /* 4 bit input, with a loop */
+ for (k = len; k; k--) {
+ w_ctr(host_no, 0x4);
+ h = r_str(host_no);
+ w_ctr(host_no, 0x6);
+ l = r_str(host_no);
+ *buffer++ = ((l >> 4) & 0x0f) + (h & 0xf0);
+ }
+ w_ctr(host_no, 0xc);
+ return 1; /* assume transfer went OK */
+
+ case PPA_PS2:
+ /* 8 bit input, with a loop */
+ for (k = len; k; k--) {
+ w_ctr(host_no, 0x25);
+ *buffer++ = r_dtr(host_no);
+ w_ctr(host_no, 0x27);
+ }
+ w_ctr(host_no, 0x5);
+ w_ctr(host_no, 0x4);
+ w_ctr(host_no, 0xc);
+ return 1; /* assume transfer went OK */
+
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 0
+ case PPA_EPP_32:
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC < 2
+ w_ctr(host_no, 0x24);
+ for (k = len; k; k -= 4) {
+ *buffer++ = r_epp(host_no);
+ *buffer++ = r_epp(host_no);
+ *buffer++ = r_epp(host_no);
+ *buffer++ = r_epp(host_no);
+ r = ppa_check_epp_status(host_no);
+ if (!r)
+ return r;
+ }
+ w_ctr(host_no, 0x2c);
+ ecp_sync(host_no);
+ return 1;
+#endif
+ case PPA_EPP_16:
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC < 3
+ w_ctr(host_no, 0x24);
+ for (k = len; k; k -= 2) {
+ *buffer++ = r_epp(host_no);
+ *buffer++ = r_epp(host_no);
+ r = ppa_check_epp_status(host_no);
+ if (!r)
+ return r;
+ }
+ w_ctr(host_no, 0x2c);
+ ecp_sync(host_no);
+ return 1;
+#endif
+ case PPA_EPP_8:
+ w_ctr(host_no, 0x24);
+ for (k = len; k; k--) {
+ *buffer++ = r_epp(host_no);
+ r = ppa_check_epp_status(host_no);
+ if (!r)
+ return r;
+ }
+ w_ctr(host_no, 0x2c);
+ ecp_sync(host_no);
+ return 1;
+ break;
+#else
+ case PPA_EPP_8:
+ case PPA_EPP_16:
+ case PPA_EPP_32:
+ w_ctr(host_no, 0x24);
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_EPP_8:
+ insb(PPA_BASE(host_no) + 0x04,
+ buffer, len);
+ break;
+ case PPA_EPP_16:
+ insw(PPA_BASE(host_no) + 0x04,
+ buffer, len / 2);
+ break;
+ case PPA_EPP_32:
+ insl(PPA_BASE(host_no) + 0x04,
+ buffer, len / 4);
+ break;
+ }
+ k = ppa_check_epp_status(host_no);
+ w_ctr(host_no, 0x2c);
+ ecp_sync(host_no);
+ return k;
+#endif
-{ ppa_abort_flag = 2;
- return SCSI_RESET_PUNT;
-}
+ default:
+ printk("PPA: bug in ppa_ins()\n");
+ }
+ return 0;
+}
+
+static int ppa_inb(int host_no, char *buffer)
+{
+ int h, l, k;
+
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ /* 4 bit input */
+ w_ctr(host_no, 0x4);
+ h = r_str(host_no);
+ w_ctr(host_no, 0x6);
+ l = r_str(host_no);
+ *buffer = ((l >> 4) & 0x0f) + (h & 0xf0);
+ w_ctr(host_no, 0xc);
+ return 1; /* assume transfer went OK */
+
+ case PPA_PS2:
+ /* 8 bit input */
+ w_ctr(host_no, 0x25);
+ *buffer++ = r_dtr(host_no);
+ w_ctr(host_no, 0x27);
+ w_ctr(host_no, 0x5);
+ w_ctr(host_no, 0x4);
+ w_ctr(host_no, 0xc);
+ return 1; /* assume transfer went OK */
+
+ case PPA_EPP_8:
+ case PPA_EPP_16:
+ case PPA_EPP_32:
+ w_ctr(host_no, 0x24);
+ *buffer = r_epp(host_no);
+ k = ppa_check_epp_status(host_no);
+ w_ctr(host_no, 0xc);
+ ecp_sync(host_no);
+ return k;
+
+ default:
+ printk("PPA: bug in ppa_inb()\n");
+ }
+ return 0;
+}
+
+/*
+ * The bulk flag enables some optimisations in the data transfer loops,
+ * it should be true for any command that transfers data in integral
+ * numbers of sectors.
+ *
+ * The driver appears to remain stable if we speed up the parallel port
+ * i/o in this function, but not elsewhere.
+ */
+static int ppa_completion(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+
+ char r, l, h, v;
+ int dir, cnt, blen, fast, bulk, status;
+ char *buffer;
+ struct scatterlist *sl;
+ int current_segment, nsegment;
+
+ v = cmd->cmnd[0];
+ bulk = ((v == READ_6) ||
+ (v == READ_10) ||
+ (v == WRITE_6) ||
+ (v == WRITE_10));
+
+ /* code for scatter/gather: */
+ if (cmd->use_sg) {
+ /* if many buffers are available, start filling the first */
+ sl = (struct scatterlist *) cmd->request_buffer;
+ blen = sl->length;
+ buffer = sl->address;
+ } else {
+ /* else fill the only available buffer */
+ sl = NULL;
+ buffer = cmd->request_buffer;
+ blen = cmd->request_bufflen;
+ }
+ current_segment = 0;
+ nsegment = cmd->use_sg;
+
+ cnt = 0;
+
+ /* detect transfer direction */
+ dir = 0;
+ if (!(r = ppa_wait(host_no)))
+ return 0;
+ if (r == (char) 0xc0)
+ dir = 1; /* d0 = read c0 = write f0 = status */
+
+ while (r != (char) 0xf0) {
+ if (((r & 0xc0) != 0xc0) || (cnt >= blen)) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ /* determine if we should use burst I/O */
+ fast = (bulk && ((blen - cnt) >= PPA_BURST_SIZE) &&
+ ((((long)buffer + cnt)) & 0x3) == 0);
+
+ if (fast) {
+ if (dir)
+ status = ppa_outs(host_no, &buffer[cnt], PPA_BURST_SIZE);
+ else
+ status = ppa_ins(host_no, &buffer[cnt], PPA_BURST_SIZE);
+ cnt += PPA_BURST_SIZE;
+ } else {
+ if (dir)
+ status = ppa_outb(host_no, buffer[cnt]);
+ else
+ status = ppa_inb(host_no, &buffer[cnt]);
+ cnt++;
+ }
+
+ if (!status || !(r = ppa_wait(host_no)))
+ return 0;
+
+ if (sl && cnt == blen) {
+ /* if scatter/gather, advance to the next segment */
+ if (++current_segment < nsegment) {
+ ++sl;
+ blen = sl->length;
+ buffer = sl->address;
+ cnt = 0;
+ }
+ /*
+ * the else case will be captured by the (cnt >= blen)
+ * test above.
+ */
+ }
+ }
+
+ /* read status and message bytes */
+ if (!ppa_inb(host_no, &l)) /* read status byte */
+ return 0;
+ if (!(ppa_wait(host_no)))
+ return 0;
+ if (!ppa_inb(host_no, &h)) /* read message byte */
+ return 0;
-const char *ppa_info( struct Scsi_Host * host )
+ ppa_disconnect(host_no);
-{ return ppa_info_string;
+ ppa_hosts[host_no].error_code = DID_OK;
+ return (h << 8) | (l & STATUS_MASK);
}
-#ifndef MODULE
-
-/* Command line parameters (for built-in driver):
-
- Syntax: ppa=base[,speed_high[,speed_low[,nybble]]]
-
- For example: ppa=0x378 or ppa=0x378,0,3
-
-*/
-
-void ppa_setup(char *str, int *ints)
+/* deprecated synchronous interface */
-{ if (ints[0] > 0) ppa_base = ints[1];
- if (ints[0] > 1) ppa_speed_high = ints[2];
- if (ints[0] > 2) ppa_speed_low = ints[3];
- if (ints[0] > 3) ppa_nybble = ints[4];
- if (ints[0] > 4) ppa_nybble = ints[5];
+int ppa_command(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ int s;
+
+ sti();
+ s = 0;
+ if (ppa_start(cmd))
+ if (ppa_wait(host_no))
+ s = ppa_completion(cmd);
+ return s + (ppa_hosts[host_no].error_code << 16);
}
-#else
+/* pseudo-interrupt queueing interface */
+/*
+ * Since the PPA itself doesn't generate interrupts, we use
+ * the scheduler's task queue to generate a stream of call-backs and
+ * complete the request when the drive is ready.
+ */
+static void ppa_interrupt(void *data)
+{
+ ppa_struct *tmp = (ppa_struct *) data;
+ Scsi_Cmnd *cmd = tmp->cur_cmd;
+ void (*done) (Scsi_Cmnd *) = tmp->done;
+ int host_no = cmd->host->unique_id;
+
+ if (!cmd) {
+ printk("PPA: bug in ppa_interrupt\n");
+ return;
+ }
+ /* First check for any errors that may of occured
+ * Here we check for internal errors
+ */
+ if (tmp->ppa_failed) {
+ printk("PPA: ppa_failed bug: ppa_error_code = %d\n",
+ tmp->error_code);
+ cmd->result = DID_ERROR << 16;
+ tmp->cur_cmd = 0;
+ done(cmd);
+ return;
+ }
+ /* Occasionally the mid level driver will abort a SCSI
+ * command because we are taking to long, if this occurs
+ * we should abort the command.
+ */
+ if (tmp->abort_flag) {
+ ppa_disconnect(host_no);
+ if (tmp->abort_flag == 1)
+ cmd->result = DID_ABORT << 16;
+ else {
+ ppa_do_reset(host_no);
+ cmd->result = DID_RESET << 16;
+ }
+ tmp->cur_cmd = 0;
+ done(cmd);
+ return;
+ }
+ /* Check to see if the device is now free, if not
+ * then throw this function onto the scheduler queue
+ * to be called back in a jiffy.
+ * (i386: 1 jiffy = 0.01 seconds)
+ */
+ if (!(r_str(host_no) & 0x80)) {
+ tmp->ppa_tq.data = (void *) tmp;
+ queue_task(&tmp->ppa_tq, &tq_scheduler);
+ return;
+ }
+ /* Device is now free and no errors have occured so
+ * it is safe to do the data phase
+ */
+ cmd->result = ppa_completion(cmd) + (tmp->error_code << 16);
+ tmp->cur_cmd = 0;
+ done(cmd);
+ return;
+}
+
+int ppa_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
+{
+ int host_no = cmd->host->unique_id;
+
+ if (ppa_hosts[host_no].cur_cmd) {
+ printk("PPA: bug in ppa_queuecommand\n");
+ return 0;
+ }
+ sti();
+ ppa_hosts[host_no].cur_cmd = cmd;
+ ppa_hosts[host_no].done = done;
+
+ if (!ppa_start(cmd)) {
+ cmd->result = ppa_hosts[host_no].error_code << 16;
+ ppa_hosts[host_no].cur_cmd = 0;
+ done(cmd);
+ return 0;
+ }
+ ppa_interrupt(ppa_hosts + host_no);
+
+ return 0;
+}
+
+/*
+ * Apparently the the disk->capacity attribute is off by 1 sector
+ * for all disk drives. We add the one here, but it should really
+ * be done in sd.c. Even if it gets fixed there, this will still
+ * work.
+ */
+int ppa_biosparam(Disk * disk, kdev_t dev, int ip[])
+{
+ ip[0] = 0x40;
+ ip[1] = 0x20;
+ ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
+ if (ip[2] > 1024) {
+ ip[0] = 0xff;
+ ip[1] = 0x3f;
+ ip[2] = (disk->capacity + 1) / (ip[0] * ip[1]);
+ if (ip[2] > 1023)
+ ip[2] = 1023;
+ }
+ return 0;
+}
+
+int ppa_abort(Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+
+ ppa_hosts[host_no].abort_flag = 1;
+ ppa_hosts[host_no].error_code = DID_ABORT;
+ if (ppa_hosts[host_no].ppa_wait_q)
+ wake_up(&ppa_hosts[host_no].ppa_wait_q);
+
+ return SCSI_ABORT_SNOOZE;
+}
+
+int ppa_reset(Scsi_Cmnd * cmd, unsigned int x)
+{
+ int host_no = cmd->host->unique_id;
+
+ ppa_hosts[host_no].abort_flag = 2;
+ ppa_hosts[host_no].error_code = DID_RESET;
+ if (ppa_hosts[host_no].ppa_wait_q)
+ wake_up(&ppa_hosts[host_no].ppa_wait_q);
+
+ return SCSI_RESET_PUNT;
+}
+
+
+
+/***************************************************************************
+ * Parallel port probing routines *
+ ***************************************************************************/
-Scsi_Host_Template driver_template = PPA;
+#ifdef MODULE
+Scsi_Host_Template driver_template = PPA;
#include "scsi_module.c"
-
#endif
+/*
+ * Start of Chipset kludges
+ */
+
+int ppa_detect(Scsi_Host_Template * host)
+{
+ struct Scsi_Host *hreg;
+ int rs;
+ int ports;
+ int i, nhosts;
+ struct parport *pb = parport_enumerate();
+
+ printk("PPA driver version: %s\n", PPA_VERSION);
+ nhosts = 0;
+
+ for (i = 0; pb; i++, pb=pb->next) {
+ int modes;
+
+ /* transfer global values here */
+ if (ppa_speed >= 0)
+ ppa_hosts[i].speed = ppa_speed;
+ if (ppa_speed_fast >= 0)
+ ppa_hosts[i].speed_fast = ppa_speed_fast;
+
+ ppa_hosts[i].dev =
+ parport_register_device(pb, "ppa", NULL, ppa_wakeup,
+ NULL, PARPORT_DEV_TRAN, (void *) &ppa_hosts[i]);
+
+ /* Claim the bus so it remembers what we do to the control
+ * registers. [ CTR and ECP ]
+ */
+ ppa_pb_claim(i);
+ w_ctr(i, 0x0c);
+ modes = ppa_hosts[i].dev->port->modes;
+
+ ppa_hosts[i].mode = PPA_NIBBLE;
+ if (modes & (PARPORT_MODE_EPP | PARPORT_MODE_ECPEPP)) {
+ ppa_hosts[i].mode = PPA_EPP_32;
+ printk("PPA: Parport [ EPP ]\n");
+ } else if (modes & PARPORT_MODE_ECP) {
+ w_ecr(i, 0x20);
+ ppa_hosts[i].mode = PPA_PS2;
+ printk("PPA: Parport [ ECP in PS2 submode ]\n");
+ } else if (modes & PARPORT_MODE_PS2) {
+ ppa_hosts[i].mode = PPA_PS2;
+ printk("PPA: Parport [ PS2 ]\n");
+ }
+ /* Done configuration */
+ ppa_pb_release(i);
+
+ rs = ppa_init(i);
+ if (rs) {
+ parport_unregister_device(ppa_hosts[i].dev);
+ continue;
+ }
+ /* now the glue ... */
+ switch (ppa_hosts[i].mode) {
+ case PPA_NIBBLE:
+ case PPA_PS2:
+ ports = 3;
+ break;
+ case PPA_EPP_8:
+ case PPA_EPP_16:
+ case PPA_EPP_32:
+ ports = 8;
+ break;
+ default: /* Never gets here */
+ continue;
+ }
+
+ host->can_queue = PPA_CAN_QUEUE;
+ host->sg_tablesize = ppa_sg;
+ hreg = scsi_register(host, 0);
+ hreg->io_port = pb->base;
+ hreg->n_io_port = ports;
+ hreg->dma_channel = -1;
+ hreg->unique_id = i;
+ ppa_hosts[i]..host = hreg->host_no;
+ nhosts++;
+ }
+ if (nhosts == 0)
+ return 0;
+ else
+ return 1; /* return number of hosts detected */
+}
+
+/* This is to give the ppa driver a way to modify the timings (and other
+ * parameters) by writing to the /proc/scsi/ppa/0 file.
+ * Very simple method really... (To simple, no error checking :( )
+ * Reason: Kernel hackers HATE having to unload and reload modules for
+ * testing...
+ * Also gives a method to use a script to obtain optimum timings (TODO)
+ */
+
+static int ppa_strncmp(const char *a, const char *b, int len)
+{
+ int loop;
+ for (loop = 0; loop < len; loop++)
+ if (a[loop] != b[loop])
+ return 1;
+
+ return 0;
+}
+
+static int ppa_proc_write(int hostno, char *buffer, int length)
+{
+ unsigned long x;
+ const char *inv_num = "ppa /proc entry passed invalid number\n";
+
+ if ((length > 15) && (ppa_strncmp(buffer, "ppa_speed_fast=", 15) == 0)) {
+ x = simple_strtoul(buffer + 15, NULL, 0);
+ if (x <= ppa_hosts[hostno].speed)
+ ppa_hosts[hostno].speed_fast = x;
+ else
+ printk(inv_num);
+ return length;
+ }
+ if ((length > 10) && (ppa_strncmp(buffer, "ppa_speed=", 10) == 0)) {
+ x = simple_strtoul(buffer + 10, NULL, 0);
+ if (x >= ppa_hosts[hostno].speed_fast)
+ ppa_hosts[hostno].speed = x;
+ else
+ printk(inv_num);
+ return length;
+ }
+ if ((length > 10) && (ppa_strncmp(buffer, "epp_speed=", 10) == 0)) {
+ x = simple_strtoul(buffer + 10, NULL, 0);
+ ppa_hosts[hostno].epp_speed = x;
+ return length;
+ }
+ if ((length > 12) && (ppa_strncmp(buffer, "epp_timeout=", 12) == 0)) {
+ x = simple_strtoul(buffer + 12, NULL, 0);
+ ppa_hosts[hostno].timeout = x;
+ return length;
+ }
+ if ((length > 5) && (ppa_strncmp(buffer, "mode=", 5) == 0)) {
+ x = simple_strtoul(buffer + 5, NULL, 0);
+ ppa_hosts[hostno].mode = x;
+ return length;
+ }
+ printk("ppa /proc: invalid variable\n");
+ return (-EINVAL);
+}
+
+int ppa_proc_info(char *buffer, char **start, off_t offset,
+ int length, int hostno, int inout)
+{
+ int i;
+ int size, len = 0;
+ off_t begin = 0;
+ off_t pos = 0;
+
+ for (i = 0; i < 4; i++)
+ if (ppa_hosts[i].host == hostno)
+ break;
+
+ if (inout)
+ return ppa_proc_write(i, buffer, length);
+
+ size = sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
+ len += size;
+ pos = begin + len;
+ size = sprintf(buffer + len, "Parport : %s\n",
+ ppa_hosts[i].dev->port->name);
+ len += size;
+ pos = begin + len;
+
+ size = sprintf(buffer + len, "Mode : %s\n",
+ PPA_MODE_STRING[ppa_hosts[i].mode]);
+ len += size;
+ pos = begin + len;
+
+ size = sprintf(buffer + len, "\nTiming Parameters\n");
+ len += size;
+ pos = begin + len;
+
+ size = sprintf(buffer + len, "ppa_speed %i\n",
+ ppa_hosts[i].speed);
+ len += size;
+ pos = begin + len;
+
+ size = sprintf(buffer + len, "ppa_speed_fast %i\n",
+ ppa_hosts[i].speed_fast);
+ len += size;
+ pos = begin + len;
+
+ if (IN_EPP_MODE(ppa_hosts[i].mode)) {
+ size = sprintf(buffer + len, "epp_speed %i\n",
+ ppa_hosts[i].epp_speed);
+ len += size;
+ pos = begin + len;
+
+ size = sprintf(buffer + len, "\nInternal Counters\n");
+ len += size;
+ pos = begin + len;
+
+ size = sprintf(buffer + len, "epp_timeout %i\n",
+ ppa_hosts[i].timeout);
+ len += size;
+ pos = begin + len;
+ }
+ *start = buffer + (offset + begin);
+ len -= (offset - begin);
+ if (len > length)
+ len = length;
+ return len;
+}
/* end of ppa.c */
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