patch-2.1.64 linux/drivers/scsi/ppa.c
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- Lines: 2448
- Date:
Thu Nov 13 12:56:48 1997
- Orig file:
v2.1.63/linux/drivers/scsi/ppa.c
- Orig date:
Mon Nov 3 13:04:26 1997
diff -u --recursive --new-file v2.1.63/linux/drivers/scsi/ppa.c linux/drivers/scsi/ppa.c
@@ -6,369 +6,291 @@
* (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.
- *
- * 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]
+ * Current Maintainer: David Campbell (Perth, Western Australia, GMT+0800)
+ * campbell@gear.torque.net
+ * dcampbel@p01.as17.honeywell.com.au
*/
#include <linux/config.h>
/* The following #define is to avoid a clash with hosts.c */
#define PPA_CODE 1
-#include "ppa.h"
-/* batteries not included :-) */
-/*
- * 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"};
+#include <linux/blk.h>
+#include <asm/io.h>
+#include <linux/parport.h>
+#include "sd.h"
+#include "hosts.h"
+int ppa_release(struct Scsi_Host *);
typedef struct {
- struct pardevice *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 */
+ struct pardevice *dev; /* Parport device entry */
+ int base; /* Actual port address */
+ int mode; /* Transfer mode */
+ int host; /* Host number (for proc) */
+ Scsi_Cmnd *cur_cmd; /* Current queued command */
+ struct tq_struct ppa_tq; /* Polling interupt stuff */
+ unsigned long jstart; /* Jiffies at start */
+ unsigned int failed:1; /* Failure flag */
+ unsigned int p_busy:1; /* Parport sharing busy flag */
} ppa_struct;
-static void ppa_interrupt(void *data);
-/* I know that this is a mess but it works!! */
+#define PPA_EMPTY \
+{NULL, /* dev */ \
+-1, /* base */ \
+PPA_AUTODETECT, /* mode */ \
+-1, /* host */ \
+NULL, /* cur_cmd */ \
+{0, 0, ppa_interrupt, NULL}, \
+0, /* jstart */ \
+0, /* failed */ \
+0 /* p_busy */ \
+}
+
+#include "ppa.h"
+#include <linux/parport.h>
+
+#ifdef CONFIG_KERNELD
+#include <linux/kerneld.h>
+#ifndef PARPORT_MODULES
+#define PARPORT_MODULES "parport_pc"
+#endif
+#endif
+
#define NO_HOSTS 4
static ppa_struct ppa_hosts[NO_HOSTS] =
+{PPA_EMPTY, PPA_EMPTY, PPA_EMPTY, PPA_EMPTY};
+
+#define PPA_BASE(x) ppa_hosts[(x)].base
+
+void ppa_wakeup(void *ref)
{
- {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)
-
-static void ppa_wakeup(void *ref)
-{
- ppa_struct *ppa_dev = (ppa_struct *) ref;
-
- if (!ppa_dev->ppa_wait_q)
- return; /* Wake up whom ? */
-
- /* Claim the Parport */
- if (parport_claim(ppa_dev->dev))
- return; /* Shouldn't happen */
+ ppa_struct *ppa_dev = (ppa_struct *) ref;
- wake_up(&ppa_dev->ppa_wait_q);
+ if (!ppa_dev->p_busy)
return;
+
+ if (parport_claim(ppa_dev->dev)) {
+ printk("ppa: bug in ppa_wakeup\n");
+ return;
+ }
+
+ ppa_dev->p_busy = 0;
+ ppa_dev->base = ppa_dev->dev->port->base;
+ if (ppa_dev->cur_cmd)
+ ppa_dev->cur_cmd->SCp.phase++;
+ return;
}
int ppa_release(struct Scsi_Host *host)
{
- int host_no = host->unique_id;
+ int host_no = host->unique_id;
- printk("Releasing ppa%i\n", host_no);
- parport_unregister_device(ppa_hosts[host_no].dev);
- return 0;
+ 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;
-}
+ if (parport_claim(ppa_hosts[host_no].dev)) {
+ ppa_hosts[host_no].p_busy = 1;
+ return 1;
+ }
-static void ppa_pb_release(int host_no)
-{
- parport_release(ppa_hosts[host_no].dev);
+ PPA_BASE(host_no) = ppa_hosts[host_no].dev->port->base;
+ if (ppa_hosts[host_no].cur_cmd)
+ ppa_hosts[host_no].cur_cmd->SCp.phase++;
+ return 0;
}
+#define ppa_pb_release(x) parport_release(ppa_hosts[(x)].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;
+/***************************************************************************
+ * Parallel port probing routines *
+ ***************************************************************************/
- for (i = 0; i < 100; i++) {
- r = r_ecr(host_no);
- if (r & 0x01)
- return;
- udelay(5);
- }
+#ifdef MODULE
+Scsi_Host_Template driver_template = PPA;
+#include "scsi_module.c"
+#endif
- printk("ppa: ECP sync failed as data still present in FIFO.\n");
-}
+/*
+ * Start of Chipset kludges
+ */
-static inline void ppa_d_pulse(int host_no, char b)
+int ppa_detect(Scsi_Host_Template * host)
{
- 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);
-}
+ struct Scsi_Host *hreg;
+ int ports;
+ int i, nhosts, try_again;
+ struct parport *pb = parport_enumerate();
+
+ printk("ppa: Version %s\n", PPA_VERSION);
+ nhosts = 0;
+ try_again = 0;
+
+#ifdef CONFIG_KERNELD
+ if (!pb) {
+ request_module(PARPORT_MODULES);
+ pb = parport_enumerate();
+ }
+#endif
-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);
+ if (!pb) {
+ printk("ppa: parport reports no devices.\n");
+ return 0;
+ }
+ retry_entry:
+ for (i = 0; pb; i++, pb = pb->next) {
+ int modes, ppb;
+
+ ppa_hosts[i].dev =
+ parport_register_device(pb, "ppa", NULL, ppa_wakeup,
+ NULL, PARPORT_DEV_TRAN, (void *) &ppa_hosts[i]);
- ppa_pb_release(host_no);
-}
+ /* Claim the bus so it remembers what we do to the control
+ * registers. [ CTR and ECP ]
+ */
+ if (ppa_pb_claim(i))
+ while (ppa_hosts[i].p_busy)
+ schedule(); /* Whe can safe schedule() here */
+ ppb = PPA_BASE(i);
+ w_ctr(ppb, 0x0c);
+ modes = ppa_hosts[i].dev->port->modes;
-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);
-}
+ /* Mode detection works up the chain of speed
+ * This avoids a nasty if-then-else-if-... tree
+ */
+ ppa_hosts[i].mode = PPA_NIBBLE;
-static int ppa_connect(int host_no, int flag)
-{
- int retv = ppa_pb_claim(host_no);
+ if (modes & PARPORT_MODE_PCPS2)
+ ppa_hosts[i].mode = PPA_PS2;
- 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);
+ if (modes & PARPORT_MODE_PCECPPS2) {
+ w_ecr(ppb, 0x20);
+ ppa_hosts[i].mode = PPA_PS2;
+ }
+ if (modes & PARPORT_MODE_PCECPEPP)
+ w_ecr(ppb, 0x80);
- return retv;
-}
+ /* Done configuration */
+ ppa_pb_release(i);
-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);
+ if (ppa_init(i)) {
+ parport_unregister_device(ppa_hosts[i].dev);
+ continue;
+ }
+ /* now the glue ... */
+ switch (ppa_hosts[i].mode) {
+ case PPA_NIBBLE:
+ ports = 3;
+ break;
+ 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) {
+ if (try_again == 1)
+ return 0;
+ try_again = 1;
+ goto retry_entry;
+ } else
+ return 1; /* return number of hosts detected */
+}
- ppa_connect(host_no, CONNECT_NORMAL);
+/* 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)
+ */
- 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);
+static inline 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;
- ppa_disconnect(host_no);
+ return 0;
}
-static char ppa_select(int host_no, int initiator, int target)
+static inline int ppa_proc_write(int hostno, char *buffer, int length)
{
- char r;
- int k;
+ unsigned long x;
- r = r_str(host_no); /* TODO */
+ 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);
+}
- 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);
+int ppa_proc_info(char *buffer, char **start, off_t offset,
+ int length, int hostno, int inout)
+{
+ int i;
+ int len = 0;
- k = 0;
- while (!(r = (r_str(host_no) & 0xf0)) && (k++ < PPA_SELECT_TMO))
- barrier();
+ for (i = 0; i < 4; i++)
+ if (ppa_hosts[i].host == hostno)
+ break;
+
+ if (inout)
+ return ppa_proc_write(i, buffer, length);
+
+ len += sprintf(buffer + len, "Version : %s\n", PPA_VERSION);
+ len += sprintf(buffer + len, "Parport : %s\n", ppa_hosts[i].dev->port->name);
+ len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_hosts[i].mode]);
- if (k >= PPA_SELECT_TMO)
- return 0;
+ /* Request for beyond end of buffer */
+ if (offset > length)
+ return 0;
- return r;
+ *start = buffer + offset;
+ len -= offset;
+ if (len > length)
+ len = length;
+ return len;
}
+/* end of ppa.c */
+static int device_check(int host_no);
-static void ppa_fail(int host_no, int error_code)
+#if PPA_DEBUG > 0
+#define ppa_fail(x,y) printk("ppa: ppa_fail(%i) from %s at line %d\n",\
+ y, __FUNCTION__, __LINE__); ppa_fail_func(x,y);
+static inline void ppa_fail_func(int host_no, int error_code)
+#else
+static inline void ppa_fail(int host_no, int error_code)
+#endif
{
- ppa_hosts[host_no].error_code = error_code;
- ppa_hosts[host_no].ppa_failed = 1;
- ppa_disconnect(host_no);
+ /* If we fail a device then we trash status / message bytes */
+ if (ppa_hosts[host_no].cur_cmd) {
+ ppa_hosts[host_no].cur_cmd->result = error_code << 16;
+ ppa_hosts[host_no].failed = 1;
+ }
}
/*
@@ -378,483 +300,539 @@
* doesn't appear to be designed to support interrupts. We spin on
* the 0x80 ready bit.
*/
-static char ppa_wait(int host_no)
+static unsigned 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
- */
+ int k;
+ unsigned short ppb = PPA_BASE(host_no);
+ unsigned char r;
+
+ k = PPA_SPIN_TMO;
+ do {
+ r = r_str(ppb);
+ k--;
+ udelay(1);
+ }
+ while (!(r & 0x80) && (k));
+
+ /*
+ * return some status information.
+ * Semantics: 0xc0 = ZIP wants more data
+ * 0xd0 = ZIP wants to send more data
+ * 0xe0 = ZIP is expecting SCSI command data
+ * 0xf0 = end of transfer, ZIP is sending status
+ */
+ if (k)
return (r & 0xf0);
-}
+ /* Counter expired - Time out occured */
+ ppa_fail(host_no, DID_TIME_OUT);
+ printk("ppa timeout in ppa_wait\n");
+ return 0; /* command timed out */
+}
-/*
- * 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.
- *
+/*
+ * output a string, in whatever mode is available, according to the
+ * PPA protocol.
*/
-static int ppa_init(int host_no)
+static inline void epp_reset(unsigned short ppb)
{
- if (ppa_pb_claim(host_no))
- return 1;
- ppa_disconnect(host_no);
+ int i;
- ppa_connect(host_no, CONNECT_NORMAL);
+ i = r_str(ppb);
+ w_str(ppb, i);
+ w_str(ppb, i & 0xfe);
+}
- 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);
+static inline void ecp_sync(unsigned short ppb)
+{
+ int i;
- ppa_disconnect(host_no);
+ if ((r_ecr(ppb) & 0xe0) != 0x80)
+ return;
- return 0;
+ for (i = 0; i < 100; i++) {
+ if (r_ecr(ppb) & 0x01)
+ return;
+ udelay(5);
+ }
+ printk("ppa: ECP sync failed as data still present in FIFO.\n");
}
-/*
- * 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
+/*
+ * Here is the asm code for the SPP/PS2 protocols for the i386.
+ * This has been optimised for speed on 386/486 machines. There will
+ * be very little improvement on the current 586+ machines as it is the
+ * IO statements which will limit throughput.
*/
-static int ppa_check_epp_status(int host_no)
-{
- char r;
- r = r_str(host_no);
+#ifdef __i386__
+#define BYTE_OUT(reg) \
+ " movb " #reg ",%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " addl $2,%%edx\n" \
+ " movb $0x0e,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " movb $0x0c,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " subl $2,%%edx\n"
+
+static inline int ppa_byte_out(unsigned short base, char *buffer, unsigned int len)
+{
+ /*
+ * %eax scratch
+ * %ebx Data to transfer
+ * %ecx Counter (Don't touch!!)
+ * %edx Port
+ * %esi Source buffer (mem pointer)
+ *
+ * In case you are wondering what the last line of the asm does...
+ * <output allocation> : <input allocation> : <trashed registers>
+ */
+ asm("shr $2,%%ecx\n" \
+ " jz .no_more_bulk_bo\n" \
+ " .align 4\n" \
+ ".loop_bulk_bo:\n" \
+ " movl (%%esi),%%ebx\n" \
+ BYTE_OUT(%%bl) \
+ BYTE_OUT(%%bh) \
+ " rorl $16,%%ebx\n" \
+ BYTE_OUT(%%bl) \
+ BYTE_OUT(%%bh) \
+ " addl $4,%%esi\n" \
+ " loop .loop_bulk_bo\n" \
+ " .align 4\n" \
+ ".no_more_bulk_bo:" \
+ : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+
+ asm("andl $3,%%ecx\n" \
+ " jz .no_more_loose_bo\n" \
+ " .align 4\n" \
+ ".loop_loose_bo:\n" \
+ BYTE_OUT((%%esi)) \
+ " incl %%esi\n" \
+ " loop .loop_loose_bo\n" \
+ ".no_more_loose_bo:\n" \
+ : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+ return 1; /* All went well - we hope! */
+}
+
+#define BYTE_IN(reg) \
+ " inb (%%dx),%%al\n" \
+ " movb %%al," #reg "\n" \
+ " addl $2,%%edx\n" \
+ " movb $0x27,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " movb $0x25,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " subl $2,%%edx\n"
+
+static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
+{
+ /*
+ * %eax scratch
+ * %ebx Data to transfer
+ * %ecx Counter (Don't touch!!)
+ * %edx Port
+ * %esi Source buffer (mem pointer)
+ *
+ * In case you are wondering what the last line of the asm does...
+ * <output allocation> : <input allocation> : <trashed registers>
+ */
+ asm("shr $2,%%ecx\n" \
+ " jz .no_more_bulk_bi\n" \
+ " .align 4\n" \
+ ".loop_bulk_bi:\n" \
+ BYTE_IN(%%bl) \
+ BYTE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ BYTE_IN(%%bl) \
+ BYTE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ " movl %%ebx,(%%esi)\n" \
+ " addl $4,%%esi\n" \
+ " loop .loop_bulk_bi\n" \
+ " .align 4\n" \
+ ".no_more_bulk_bi:" \
+ : "=S"(buffer): "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+
+ asm("andl $3,%%ecx\n" \
+ " jz .no_more_loose_bi\n" \
+ " .align 4\n" \
+ ".loop_loose_bi:\n" \
+ BYTE_IN((%%esi)) \
+ " incl %%esi\n" \
+ " loop .loop_loose_bi\n" \
+ ".no_more_loose_bi:\n" \
+ : /* no output */ : "c"(len), "d"(base), "S"(buffer):"eax", "ebx", "ecx");
+ return 1; /* All went well - we hope! */
+}
+
+#define NIBBLE_IN(reg) \
+ " incl %%edx\n" \
+ " movb $0x04,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " decl %%edx\n" \
+ " inb (%%dx),%%al\n" \
+ " andb $0xf0,%%al\n" \
+ " movb %%al," #reg "\n" \
+ " incl %%edx\n" \
+ " movb $0x06,%%al\n" \
+ " outb %%al,(%%dx)\n" \
+ " decl %%edx\n" \
+ " inb (%%dx),%%al\n" \
+ " shrb $4,%%al\n" \
+ " orb %%al," #reg "\n"
+
+static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
+{
+ /*
+ * %eax scratch
+ * %ebx Data to transfer
+ * %ecx Counter (Don't touch!!)
+ * %edx Port
+ * %esi Source buffer (mem pointer)
+ *
+ * In case you are wondering what the last line of the asm does...
+ * <output allocation> : <input allocation> : <trashed registers>
+ */
+ asm("shr $2,%%ecx\n" \
+ " jz .no_more_bulk_ni\n" \
+ " .align 4\n" \
+ ".loop_bulk_ni:\n" \
+ NIBBLE_IN(%%bl) \
+ NIBBLE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ NIBBLE_IN(%%bl) \
+ NIBBLE_IN(%%bh) \
+ " rorl $16,%%ebx\n" \
+ " movl %%ebx,(%%esi)\n" \
+ " addl $4,%%esi\n" \
+ " loop .loop_bulk_ni\n" \
+ " .align 4\n" \
+ ".no_more_bulk_ni:" \
+ : "=S"(buffer): "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx");
+
+ asm("andl $3,%%ecx\n" \
+ " jz .no_more_loose_ni\n" \
+ " .align 4\n" \
+ ".loop_loose_ni:\n" \
+ NIBBLE_IN((%%esi)) \
+ " incl %%esi\n" \
+ " loop .loop_loose_ni\n" \
+ ".no_more_loose_ni:\n" \
+ : /* no output */ : "c"(len), "d"(str_p), "S"(buffer):"eax", "ebx", "ecx");
+ return 1; /* All went well - we hope! */
+}
+#else /* Old style C routines */
+
+static inline int ppa_byte_out(unsigned short base, const char *buffer, int len)
+{
+ unsigned short ctr_p = base + 2;
+ int i;
+
+ for (i = len; i; i--) {
+ outb(*buffer++, base);
+ outb(0xe, ctr_p);
+ outb(0xc, ctr_p);
+ }
+ return 1; /* All went well - we hope! */
+}
+
+static inline int ppa_byte_in(unsigned short base, char *buffer, int len)
+{
+ unsigned short ctr_p = base + 2;
+ int i;
+
+ for (i = len; i; i--) {
+ *buffer++ = inb(base);
+ outb(0x27, ctr_p);
+ outb(0x25, ctr_p);
+ }
+ return 1; /* All went well - we hope! */
+}
+
+static inline int ppa_nibble_in(unsigned short str_p, char *buffer, int len)
+{
+ unsigned short ctr_p = str_p + 1;
+ unsigned char h, l;
+ int i;
+
+ for (i = len; i; i--) {
+ outb(0x4, ctr_p);
+ h = inb(str_p);
+ outb(0x6, ctr_p);
+ l = inb(str_p);
+ *buffer++ = (h & 0xf0) | ((l & 0xf0) >> 4);
+ }
+ return 1; /* All went well - we hope! */
+}
+#endif
- 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_epp_out(unsigned short epp_p, unsigned short str_p, const char *buffer, int len)
+{
+ int i;
+ for (i = len; i; i--) {
+ outb(*buffer++, epp_p);
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 2
+ if (inb(str_p) & 0x01)
+ return 0;
+#endif
+ }
+ return 1;
}
-static inline int ppa_force_epp_byte(int host_no, char x)
+static int ppa_out(int host_no, char *buffer, int len)
{
-/* This routine forces a byte down the EPP data port whether the
- * device is ready or not...
- */
- char r;
+ int r;
+ unsigned short ppb = PPA_BASE(host_no);
- w_epp(host_no, x);
+ r = ppa_wait(host_no);
- 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);
+ if ((r & 0x50) != 0x40) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ case PPA_PS2:
+ /* 8 bit output, with a loop */
+ r = ppa_byte_out(ppb, buffer, len);
+ break;
+
+ case PPA_EPP_32:
+ case PPA_EPP_16:
+ case PPA_EPP_8:
+ epp_reset(ppb);
+ w_ctr(ppb, 0x4);
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 1
+ r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len);
+#else
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC == 0
+ if (!(((long) buffer | len) & 0x03))
+ outsl(ppb + 4, buffer, len >> 2);
+ else
+#endif
+ outsb(ppb + 4, buffer, len);
+ w_ctr(ppb, 0xc);
+ r = !(r_str(ppb) & 0x01);
+#endif
+ w_ctr(ppb, 0xc);
+ ecp_sync(ppb);
+ break;
+
+ default:
+ printk("PPA: bug in ppa_out()\n");
+ r = 0;
+ }
+ return r;
+}
+
+static inline int ppa_epp_in(int epp_p, int str_p, char *buffer, int len)
+{
+ int i;
+ for (i = len; i; i--) {
+ *buffer++ = inb(epp_p);
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 2
+ if (inb(str_p) & 0x01)
+ return 0;
+#endif
+ }
+ return 1;
+}
- /* Take a deep breath, count to 10 and then... */
- udelay(ppa_hosts[host_no].epp_speed);
+static int ppa_in(int host_no, char *buffer, int len)
+{
+ int r;
+ unsigned short ppb = PPA_BASE(host_no);
- /* Second time around */
- w_epp(host_no, x);
+ r = ppa_wait(host_no);
- 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;
+ if ((r & 0x50) != 0x50) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ switch (ppa_hosts[host_no].mode) {
+ case PPA_NIBBLE:
+ /* 4 bit input, with a loop */
+ r = ppa_nibble_in(ppb + 1, buffer, len);
+ w_ctr(ppb, 0xc);
+ break;
+
+ case PPA_PS2:
+ /* 8 bit input, with a loop */
+ w_ctr(ppb, 0x25);
+ r = ppa_byte_in(ppb, buffer, len);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+ break;
+
+ case PPA_EPP_32:
+ case PPA_EPP_16:
+ case PPA_EPP_8:
+ epp_reset(ppb);
+ w_ctr(ppb, 0x24);
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 1
+ r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len);
+#else
+#if CONFIG_SCSI_PPA_HAVE_PEDANTIC == 0
+ if (!(((long) buffer | len) & 0x03))
+ insl(ppb + 4, buffer, len >> 2);
+ else
+#endif
+ insb(ppb + 4, buffer, len);
+ w_ctr(ppb, 0x2c);
+ r = !(r_str(ppb) & 0x01);
+#endif
+ w_ctr(ppb, 0x2c);
+ ecp_sync(ppb);
+ break;
+
+ default:
+ printk("PPA: bug in ppa_ins()\n");
+ r = 0;
+ break;
+ }
+ return r;
+}
+
+/* end of ppa_io.h */
+static inline void ppa_d_pulse(unsigned short ppb, unsigned char b)
+{
+ w_dtr(ppb, b);
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0xe);
+ w_ctr(ppb, 0xc);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
}
-static inline int ppa_send_command_normal(Scsi_Cmnd * cmd)
+static void ppa_disconnect(int host_no)
{
- int host_no = cmd->host->unique_id;
- int k;
+ unsigned short ppb = PPA_BASE(host_no);
- 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;
+ ppa_d_pulse(ppb, 0);
+ ppa_d_pulse(ppb, 0x3c);
+ ppa_d_pulse(ppb, 0x20);
+ ppa_d_pulse(ppb, 0xf);
}
-static int ppa_start(Scsi_Cmnd * cmd)
+static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
{
- int host_no = cmd->host->unique_id;
+ w_dtr(ppb, b);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0x6);
+ w_ctr(ppb, 0x4);
+ w_ctr(ppb, 0xc);
+}
- /*
- * 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;
+static inline void ppa_connect(int host_no, int flag)
+{
+ unsigned short ppb = PPA_BASE(host_no);
- 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);
+ ppa_c_pulse(ppb, 0);
+ ppa_c_pulse(ppb, 0x3c);
+ ppa_c_pulse(ppb, 0x20);
+ if ((flag == CONNECT_EPP_MAYBE) &&
+ IN_EPP_MODE(ppa_hosts[host_no].mode))
+ ppa_c_pulse(ppb, 0xcf);
+ else
+ ppa_c_pulse(ppb, 0x8f);
}
-/*
- * 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)
+static int ppa_select(int host_no, int target)
{
- int k;
-#if CONFIG_SCSI_PPA_HAVE_PEDANTIC > 0
- int r;
-#endif
-
- 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 */
+ int k;
+ unsigned short ppb = PPA_BASE(host_no);
-#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
- 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
+ /*
+ * Bit 6 (0x40) is the device selected bit.
+ * First we must wait till the current device goes off line...
+ */
+ k = PPA_SELECT_TMO;
+ do {
+ k--;
+ } while ((r_str(ppb) & 0x40) && (k));
+ if (!k)
+ return 0;
- default:
- printk("PPA: bug in ppa_outs()\n");
- }
+ w_dtr(ppb, (1 << target));
+ w_ctr(ppb, 0xe);
+ w_ctr(ppb, 0xc);
+ w_dtr(ppb, 0x80); /* This is NOT the initator */
+ w_ctr(ppb, 0x8);
+
+ k = PPA_SELECT_TMO;
+ do {
+ k--;
+ }
+ while (!(r_str(ppb) & 0x40) && (k));
+ if (!k)
return 0;
+
+ return 1;
}
-static inline int ppa_outb(int host_no, char d)
+/*
+ * 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)
{
- int k;
+ int retv;
+ unsigned short ppb = PPA_BASE(host_no);
- 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 */
+#if defined(CONFIG_PARPORT) || defined(CONFIG_PARPORT_MODULE)
+ if (ppa_pb_claim(host_no))
+ while (ppa_hosts[host_no].p_busy)
+ schedule(); /* Whe can safe schedule() here */
+#endif
- 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;
+ ppa_disconnect(host_no);
+ ppa_connect(host_no, CONNECT_NORMAL);
- default:
- printk("PPA: bug in ppa_outb()\n");
- }
- return 0;
-}
+ retv = 2; /* Failed */
-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
+ w_ctr(ppb, 0xe);
+ if ((r_str(ppb) & 0x08) == 0x08)
+ retv--;
- 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 */
+ w_ctr(ppb, 0xc);
+ if ((r_str(ppb) & 0x08) == 0x00)
+ retv--;
- 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 */
+ /* This is a SCSI BUS reset signal */
+ if (!retv) {
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000); /* Allow devices to settle down */
+ }
+ ppa_disconnect(host_no);
+ udelay(1000); /* Another delay to allow devices to settle */
-#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
+ if (!retv)
+ retv = device_check(host_no);
- default:
- printk("PPA: bug in ppa_ins()\n");
- }
- return 0;
+ ppa_pb_release(host_no);
+ return retv;
}
-static int ppa_inb(int host_no, char *buffer)
+static inline int ppa_send_command(Scsi_Cmnd * cmd)
{
- 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 */
+ int host_no = cmd->host->unique_id;
+ int k;
- 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 */
+ w_ctr(PPA_BASE(host_no), 0x0c);
- 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;
+ for (k = 0; k < cmd->cmd_len; k++)
+ if (!ppa_out(host_no, &cmd->cmnd[k], 1))
+ return 0;
+ return 1;
}
/*
@@ -867,115 +845,107 @@
*/
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++;
- }
+ /* Return codes:
+ * -1 Error
+ * 0 Told to schedule
+ * 1 Finished data transfer
+ */
+ int host_no = cmd->host->unique_id;
+ unsigned short ppb = PPA_BASE(host_no);
+ unsigned long start_jiffies = jiffies;
+
+ unsigned char r, v;
+ int fast, bulk, status;
+
+ v = cmd->cmnd[0];
+ bulk = ((v == READ_6) ||
+ (v == READ_10) ||
+ (v == WRITE_6) ||
+ (v == WRITE_10));
+
+ /*
+ * We only get here if the drive is ready to comunicate,
+ * hence no need for a full ppa_wait.
+ */
+ r = (r_str(ppb) & 0xf0);
- if (!status || !(r = ppa_wait(host_no)))
- return 0;
+ while (r != (unsigned char) 0xf0) {
+ /*
+ * If we have been running for more than a full timer tick
+ * then take a rest.
+ */
+ if (jiffies > start_jiffies + 1)
+ 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.
- */
- }
+ if (((r & 0xc0) != 0xc0) || (cmd->SCp.this_residual <= 0)) {
+ ppa_fail(host_no, DID_ERROR);
+ return -1; /* ERROR_RETURN */
}
+ /* determine if we should use burst I/O */ fast = (bulk && (cmd->SCp.this_residual >= PPA_BURST_SIZE))
+ ? PPA_BURST_SIZE : 1;
- /* 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;
+ if (r == (unsigned char) 0xc0)
+ status = ppa_out(host_no, cmd->SCp.ptr, fast);
+ else
+ status = ppa_in(host_no, cmd->SCp.ptr, fast);
- ppa_disconnect(host_no);
+ cmd->SCp.ptr += fast;
+ cmd->SCp.this_residual -= fast;
- ppa_hosts[host_no].error_code = DID_OK;
- return (h << 8) | (l & STATUS_MASK);
+ if (!status) {
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return -1; /* ERROR_RETURN */
+ }
+ if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
+ /* if scatter/gather, advance to the next segment */
+ if (cmd->SCp.buffers_residual--) {
+ cmd->SCp.buffer++;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = cmd->SCp.buffer->address;
+ }
+ }
+ /* Now check to see if the drive is ready to comunicate */
+ r = (r_str(ppb) & 0xf0);
+ /* If not, drop back down to the scheduler and wait a timer tick */
+ if (!(r & 0x80))
+ return 0;
+ }
+ return 1; /* FINISH_RETURN */
}
/* deprecated synchronous interface */
-
int ppa_command(Scsi_Cmnd * cmd)
{
- int host_no = cmd->host->unique_id;
- int s;
+ static int first_pass = 1;
+ int host_no = cmd->host->unique_id;
- 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);
+ if (first_pass) {
+ printk("ppa: using non-queuing interface\n");
+ first_pass = 0;
+ }
+ if (ppa_hosts[host_no].cur_cmd) {
+ printk("PPA: bug in ppa_command\n");
+ return 0;
+ }
+ ppa_hosts[host_no].failed = 0;
+ ppa_hosts[host_no].jstart = jiffies;
+ ppa_hosts[host_no].cur_cmd = cmd;
+ cmd->result = DID_ERROR << 16; /* default return code */
+ cmd->SCp.phase = 0;
+
+ ppa_pb_claim(host_no);
+
+ while (ppa_engine(&ppa_hosts[host_no], cmd))
+ schedule();
+
+ if (cmd->SCp.phase) /* Only disconnect if we have connected */
+ ppa_disconnect(cmd->host->unique_id);
+
+ ppa_pb_release(host_no);
+ ppa_hosts[host_no].cur_cmd = 0;
+ return cmd->result;
}
-/* 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
@@ -983,82 +953,198 @@
*/
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;
+ ppa_struct *tmp = (ppa_struct *) data;
+ Scsi_Cmnd *cmd = tmp->cur_cmd;
+
+ if (!cmd) {
+ printk("PPA: bug in ppa_interrupt\n");
+ return;
+ }
+ if (ppa_engine(tmp, cmd)) {
+ tmp->ppa_tq.data = (void *) tmp;
+ tmp->ppa_tq.sync = 0;
+ queue_task(&tmp->ppa_tq, &tq_timer);
+ return;
+ }
+ /* Command must of completed hence it is safe to let go... */
+#if PPA_DEBUG > 0
+ switch ((cmd->result >> 16) & 0xff) {
+ case DID_OK:
+ break;
+ case DID_NO_CONNECT:
+ printk("ppa: no device at SCSI ID %i\n", cmd->target);
+ break;
+ case DID_BUS_BUSY:
+ printk("ppa: BUS BUSY - EPP timeout detected\n");
+ break;
+ case DID_TIME_OUT:
+ printk("ppa: unknown timeout\n");
+ break;
+ case DID_ABORT:
+ printk("ppa: told to abort\n");
+ break;
+ case DID_PARITY:
+ printk("ppa: parity error (???)\n");
+ break;
+ case DID_ERROR:
+ printk("ppa: internal driver error\n");
+ break;
+ case DID_RESET:
+ printk("ppa: told to reset device\n");
+ break;
+ case DID_BAD_INTR:
+ printk("ppa: bad interrupt (???)\n");
+ break;
+ default:
+ printk("ppa: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
+ }
+#endif
+
+ ppa_disconnect(cmd->host->unique_id);
+ ppa_pb_release(cmd->host->unique_id);
+ tmp->cur_cmd = 0;
+ cmd->scsi_done(cmd);
+ return;
+}
+
+static int ppa_engine(ppa_struct * tmp, Scsi_Cmnd * cmd)
+{
+ int host_no = cmd->host->unique_id;
+ unsigned short ppb = PPA_BASE(host_no);
+ unsigned char l = 0, h = 0;
+ int retv;
+
+ /* First check for any errors that may of occured
+ * Here we check for internal errors
+ */
+ if (tmp->failed)
+ return 0;
+
+ switch (cmd->SCp.phase) {
+ case 0: /* Phase 0 - Waiting for parport */
+ if ((jiffies - tmp->jstart) > HZ) {
+ /*
+ * We waited more than a second
+ * for parport to call us
+ */
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ }
+ return 1; /* wait that ppa_wakeup claims parport */
+ case 1: /* Phase 1 - Connected */
+ { /* Perform a sanity check for cable unplugged */
+ int retv = 2; /* Failed */
+
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+
+ w_ctr(ppb, 0xe);
+ if ((r_str(ppb) & 0x08) == 0x08)
+ retv--;
+
+ w_ctr(ppb, 0xc);
+ if ((r_str(ppb) & 0x08) == 0x00)
+ retv--;
+
+ if (retv)
+ if ((jiffies - tmp->jstart) > (1 * HZ)) {
+ printk("ppa: Parallel port cable is unplugged!!\n");
+ ppa_fail(host_no, DID_BUS_BUSY);
+ return 0;
+ } else {
+ ppa_disconnect(host_no);
+ return 1; /* Try again in a jiffy */
}
- tmp->cur_cmd = 0;
- done(cmd);
- return;
+ cmd->SCp.phase++;
}
- /* 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;
+
+ case 2: /* Phase 2 - We are now talking to the scsi bus */
+ if (!ppa_select(host_no, cmd->target)) {
+ ppa_fail(host_no, DID_NO_CONNECT);
+ return 0;
}
- /* 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;
+ cmd->SCp.phase++;
+
+ case 3: /* Phase 3 - Ready to accept a command */
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ if (!ppa_send_command(cmd))
+ return 0;
+ cmd->SCp.phase++;
+
+ case 4: /* Phase 4 - Setup scatter/gather buffers */
+ if (cmd->use_sg) {
+ /* if many buffers are available, start filling the first */
+ cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = cmd->SCp.buffer->address;
+ } else {
+ /* else fill the only available buffer */
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.this_residual = cmd->request_bufflen;
+ cmd->SCp.ptr = cmd->request_buffer;
+ }
+ cmd->SCp.buffers_residual = cmd->use_sg;
+ cmd->SCp.phase++;
+
+ case 5: /* Phase 5 - Data transfer stage */
+ w_ctr(ppb, 0x0c);
+ if (!(r_str(ppb) & 0x80))
+ return 1;
+
+ retv = ppa_completion(cmd);
+ if (retv == -1)
+ return 0;
+ if (retv == 0)
+ return 1;
+ cmd->SCp.phase++;
+
+ case 6: /* Phase 6 - Read status/message */
+ cmd->result = DID_OK << 16;
+ /* Check for data overrun */
+ if (ppa_wait(host_no) != (unsigned char) 0xf0) {
+ ppa_fail(host_no, DID_ERROR);
+ return 0;
+ }
+ if (ppa_in(host_no, &l, 1)) { /* read status byte */
+ /* Check for optional message byte */
+ if (ppa_wait(host_no) == (unsigned char) 0xf0)
+ ppa_in(host_no, &h, 1);
+ cmd->result = (DID_OK << 16) + (h << 8) + (l & STATUS_MASK);
+ }
+ return 0; /* Finished */
+ break;
+
+ default:
+ printk("ppa: Invalid scsi phase\n");
+ }
+ return 0;
}
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);
+ int host_no = cmd->host->unique_id;
+ if (ppa_hosts[host_no].cur_cmd) {
+ printk("PPA: bug in ppa_queuecommand\n");
return 0;
+ }
+ ppa_hosts[host_no].failed = 0;
+ ppa_hosts[host_no].jstart = jiffies;
+ ppa_hosts[host_no].cur_cmd = cmd;
+ cmd->scsi_done = done;
+ cmd->result = DID_ERROR << 16; /* default return code */
+ cmd->SCp.phase = 0; /* bus free */
+
+ ppa_pb_claim(host_no);
+
+ ppa_hosts[host_no].ppa_tq.data = ppa_hosts + host_no;
+ ppa_hosts[host_no].ppa_tq.sync = 0;
+ queue_task(&ppa_hosts[host_no].ppa_tq, &tq_immediate);
+ mark_bh(IMMEDIATE_BH);
+
+ return 0;
}
/*
@@ -1069,263 +1155,166 @@
*/
int ppa_biosparam(Disk * disk, kdev_t dev, int ip[])
{
- ip[0] = 0x40;
- ip[1] = 0x20;
+ 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] > 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;
+ 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;
+ /*
+ * There is no method for aborting commands since Iomega
+ * have tied the SCSI_MESSAGE line high in the interface
+ */
+
+ switch (cmd->SCp.phase) {
+ case 0: /* Do not have access to parport */
+ case 1: /* Have not connected to interface */
+ cmd->result = DID_ABORT;
+ cmd->done(cmd);
+ return SCSI_ABORT_SUCCESS;
+ break;
+ default: /* SCSI command sent, can not abort */
+ return SCSI_ABORT_BUSY;
+ break;
+ }
}
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 *
- ***************************************************************************/
-
+ int host_no = cmd->host->unique_id;
+ int ppb = PPA_BASE(host_no);
-#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 = pb->modes;
-
- /* We only understand PC-style ports */
- if (modes & PARPORT_MODE_PCSPP) {
-
- /* 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);
-
- ppa_hosts[i].mode = PPA_NIBBLE;
- if (modes & (PARPORT_MODE_PCEPP | PARPORT_MODE_PCECPEPP)) {
- ppa_hosts[i].mode = PPA_EPP_32;
- printk("PPA: Parport [ PCEPP ]\n");
- } else if (modes & PARPORT_MODE_PCECP) {
- w_ecr(i, 0x20);
- ppa_hosts[i].mode = PPA_PS2;
- printk("PPA: Parport [ PCECP in PS2 submode ]\n");
- } else if (modes & PARPORT_MODE_PCPS2) {
- ppa_hosts[i].mode = PPA_PS2;
- printk("PPA: Parport [ PCPS2 ]\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++;
- }
+ /*
+ * PHASE1:
+ * Bring the interface crashing down on whatever is running
+ * hopefully this will kill the request.
+ * Bring back up the interface, reset the drive (and anything
+ * attached for that manner)
+ */
+ if (cmd)
+ if (cmd->SCp.phase)
+ ppa_disconnect(cmd->host->unique_id);
+
+ ppa_connect(host_no, CONNECT_NORMAL);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x8);
+ udelay(30);
+ w_ctr(ppb, 0xc);
+ udelay(1000); /* delay for devices to settle down */
+ ppa_disconnect(host_no);
+ udelay(1000); /* Additional delay to allow devices to settle down */
+
+ /*
+ * PHASE2:
+ * Sanity check for the sake of mid-level driver
+ */
+ if (!cmd) {
+ printk("ppa bus reset called for invalid command.\n");
+ return SCSI_RESET_NOT_RUNNING;
+ }
+ /*
+ * PHASE3:
+ * Flag the current command as having died due to reset
+ */
+ ppa_connect(host_no, CONNECT_NORMAL);
+ ppa_fail(host_no, DID_RESET);
+
+ /* Since the command was already on the timer queue ppa_interrupt
+ * will be called shortly.
+ */
+ return SCSI_RESET_PENDING;
+}
+
+static int device_check(int host_no)
+{
+ /* This routine looks for a device and then attempts to use EPP
+ to send a command. If all goes as planned then EPP is available. */
+
+ static char cmd[6] =
+ {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+ int loop, old_mode, status, k, ppb = PPA_BASE(host_no);
+ unsigned char l;
+
+ old_mode = ppa_hosts[host_no].mode;
+ for (loop = 0; loop < 8; loop++) {
+ /* Attempt to use EPP for Test Unit Ready */
+ if ((ppb & 0x0007) == 0x0000)
+ ppa_hosts[host_no].mode = PPA_EPP_32;
+
+ second_pass:
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+ /* Select SCSI device */
+ if (!ppa_select(host_no, loop)) {
+ ppa_disconnect(host_no);
+ continue;
+ }
+ printk("ppa: Found device at ID %i, Attempting to use %s\n", loop,
+ PPA_MODE_STRING[ppa_hosts[host_no].mode]);
+
+ /* Send SCSI command */
+ status = 1;
+ w_ctr(ppb, 0x0c);
+ for (l = 0; (l < 6) && (status); l++)
+ status = ppa_out(host_no, cmd, 1);
+
+ if (!status) {
+ ppa_disconnect(host_no);
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000);
+ ppa_disconnect(host_no);
+ udelay(1000);
+ if (ppa_hosts[host_no].mode == PPA_EPP_32) {
+ ppa_hosts[host_no].mode = old_mode;
+ goto second_pass;
+ }
+ printk("ppa: Unable to establish communication, aborting driver load.\n");
+ return 1;
+ }
+ w_ctr(ppb, 0x0c);
+ k = 1000000; /* 1 Second */
+ do {
+ l = r_str(ppb);
+ k--;
+ udelay(1);
+ } while (!(l & 0x80) && (k));
+
+ l &= 0xf0;
+
+ if (l != 0xf0) {
+ ppa_disconnect(host_no);
+ ppa_connect(host_no, CONNECT_EPP_MAYBE);
+ w_dtr(ppb, 0x40);
+ w_ctr(ppb, 0x08);
+ udelay(30);
+ w_ctr(ppb, 0x0c);
+ udelay(1000);
+ ppa_disconnect(host_no);
+ udelay(1000);
+ if (ppa_hosts[host_no].mode == PPA_EPP_32) {
+ ppa_hosts[host_no].mode = old_mode;
+ goto second_pass;
+ }
+ printk("ppa: Unable to establish communication, aborting driver load.\n");
+ return 1;
}
- 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;
-
+ ppa_disconnect(host_no);
+ printk("ppa: Communication established with ID %i using %s\n", loop,
+ PPA_MODE_STRING[ppa_hosts[host_no].mode]);
return 0;
+ }
+ printk("ppa: No devices found, aborting driver load.\n");
+ return 1;
}
-
-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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