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/* imm.c -- low level driver for the IOMEGA MatchMaker
* parallel port SCSI host adapter.
*
* (The IMM is the embedded controller in the ZIP Plus drive.)
*
* Current Maintainer: David Campbell (Perth, Western Australia)
* campbell@torque.net
*
* My unoffical company acronym list is 21 pages long:
* FLA: Four letter acronym with built in facility for
* future expansion to five letters.
*/
#include <linux/config.h>
/* The following #define is to avoid a clash with hosts.c */
#define IMM_CODE 1
#define IMM_PROBE_SPP 0x0001
#define IMM_PROBE_PS2 0x0002
#define IMM_PROBE_ECR 0x0010
#define IMM_PROBE_EPP17 0x0100
#define IMM_PROBE_EPP19 0x0200
void imm_reset_pulse(unsigned int base);
static int device_check(int host_no);
#include <linux/blk.h>
#include <asm/io.h>
#include <linux/parport.h>
#include "sd.h"
#include "hosts.h"
typedef struct {
struct pardevice *dev; /* Parport device entry */
int base; /* Actual port address */
int base_hi; /* Hi Base address for ECP-ISA chipset */
int mode; /* Transfer mode */
int host; /* Host number (for proc) */
Scsi_Cmnd *cur_cmd; /* Current queued command */
struct tq_struct imm_tq; /* Polling interrupt stuff */
unsigned long jstart; /* Jiffies at start */
unsigned failed:1; /* Failure flag */
unsigned dp:1; /* Data phase present */
unsigned rd:1; /* Read data in data phase */
unsigned p_busy:1; /* Parport sharing busy flag */
} imm_struct;
#define IMM_EMPTY \
{ dev: NULL, \
base: -1, \
base_hi: 0, \
mode: IMM_AUTODETECT, \
host: -1, \
cur_cmd: NULL, \
imm_tq: { routine: imm_interrupt }, \
jstart: 0, \
failed: 0, \
dp: 0, \
rd: 0, \
p_busy: 0 \
}
#include "imm.h"
#define NO_HOSTS 4
static imm_struct imm_hosts[NO_HOSTS] =
{IMM_EMPTY, IMM_EMPTY, IMM_EMPTY, IMM_EMPTY};
#define IMM_BASE(x) imm_hosts[(x)].base
#define IMM_BASE_HI(x) imm_hosts[(x)].base_hi
int parbus_base[NO_HOSTS] =
{0x03bc, 0x0378, 0x0278, 0x0000};
void imm_wakeup(void *ref)
{
imm_struct *imm_dev = (imm_struct *) ref;
if (!imm_dev->p_busy)
return;
if (parport_claim(imm_dev->dev)) {
printk("imm: bug in imm_wakeup\n");
return;
}
imm_dev->p_busy = 0;
imm_dev->base = imm_dev->dev->port->base;
if (imm_dev->cur_cmd)
imm_dev->cur_cmd->SCp.phase++;
return;
}
int imm_release(struct Scsi_Host *host)
{
int host_no = host->unique_id;
printk("Releasing imm%i\n", host_no);
parport_unregister_device(imm_hosts[host_no].dev);
return 0;
}
static int imm_pb_claim(int host_no)
{
if (parport_claim(imm_hosts[host_no].dev)) {
imm_hosts[host_no].p_busy = 1;
return 1;
}
if (imm_hosts[host_no].cur_cmd)
imm_hosts[host_no].cur_cmd->SCp.phase++;
return 0;
}
#define imm_pb_release(x) parport_release(imm_hosts[(x)].dev)
/***************************************************************************
* Parallel port probing routines *
***************************************************************************/
static Scsi_Host_Template driver_template = IMM;
#include "scsi_module.c"
int imm_detect(Scsi_Host_Template * host)
{
struct Scsi_Host *hreg;
int ports;
int i, nhosts, try_again;
struct parport *pb;
/*
* unlock to allow the lowlevel parport driver to probe
* the irqs
*/
spin_unlock_irq(&io_request_lock);
pb = parport_enumerate();
printk("imm: Version %s\n", IMM_VERSION);
nhosts = 0;
try_again = 0;
if (!pb) {
printk("imm: parport reports no devices.\n");
spin_lock_irq(&io_request_lock);
return 0;
}
retry_entry:
for (i = 0; pb; i++, pb = pb->next) {
int modes, ppb;
imm_hosts[i].dev =
parport_register_device(pb, "imm", NULL, imm_wakeup,
NULL, 0, (void *) &imm_hosts[i]);
if (!imm_hosts[i].dev)
continue;
/* Claim the bus so it remembers what we do to the control
* registers. [ CTR and ECP ]
*/
if (imm_pb_claim(i)) {
unsigned long now = jiffies;
while (imm_hosts[i].p_busy) {
schedule(); /* We are safe to schedule here */
if (time_after(jiffies, now + 3 * HZ)) {
printk(KERN_ERR "imm%d: failed to claim parport because a "
"pardevice is owning the port for too longtime!\n",
i);
parport_unregister_device (imm_hosts[i].dev);
spin_lock_irq(&io_request_lock);
return 0;
}
}
}
ppb = IMM_BASE(i) = imm_hosts[i].dev->port->base;
IMM_BASE_HI(i) = imm_hosts[i].dev->port->base_hi;
w_ctr(ppb, 0x0c);
modes = imm_hosts[i].dev->port->modes;
/* Mode detection works up the chain of speed
* This avoids a nasty if-then-else-if-... tree
*/
imm_hosts[i].mode = IMM_NIBBLE;
if (modes & PARPORT_MODE_TRISTATE)
imm_hosts[i].mode = IMM_PS2;
/* Done configuration */
imm_pb_release(i);
if (imm_init(i)) {
parport_unregister_device(imm_hosts[i].dev);
continue;
}
/* now the glue ... */
switch (imm_hosts[i].mode) {
case IMM_NIBBLE:
ports = 3;
break;
case IMM_PS2:
ports = 3;
break;
case IMM_EPP_8:
case IMM_EPP_16:
case IMM_EPP_32:
ports = 8;
break;
default: /* Never gets here */
continue;
}
host->can_queue = IMM_CAN_QUEUE;
host->sg_tablesize = imm_sg;
hreg = scsi_register(host, 0);
if(hreg == NULL)
continue;
hreg->io_port = pb->base;
hreg->n_io_port = ports;
hreg->dma_channel = -1;
hreg->unique_id = i;
imm_hosts[i].host = hreg->host_no;
nhosts++;
}
if (nhosts == 0) {
if (try_again == 1) {
spin_lock_irq(&io_request_lock);
return 0;
}
try_again = 1;
goto retry_entry;
} else {
spin_lock_irq (&io_request_lock);
return 1; /* return number of hosts detected */
}
}
/* This is to give the imm driver a way to modify the timings (and other
* parameters) by writing to the /proc/scsi/imm/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 inline int imm_proc_write(int hostno, char *buffer, int length)
{
unsigned long x;
if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) {
x = simple_strtoul(buffer + 5, NULL, 0);
imm_hosts[hostno].mode = x;
return length;
}
printk("imm /proc: invalid variable\n");
return (-EINVAL);
}
int imm_proc_info(char *buffer, char **start, off_t offset,
int length, int hostno, int inout)
{
int i;
int len = 0;
for (i = 0; i < 4; i++)
if (imm_hosts[i].host == hostno)
break;
if (inout)
return imm_proc_write(i, buffer, length);
len += sprintf(buffer + len, "Version : %s\n", IMM_VERSION);
len += sprintf(buffer + len, "Parport : %s\n", imm_hosts[i].dev->port->name);
len += sprintf(buffer + len, "Mode : %s\n", IMM_MODE_STRING[imm_hosts[i].mode]);
/* Request for beyond end of buffer */
if (offset > len)
return 0;
*start = buffer + offset;
len -= offset;
if (len > length)
len = length;
return len;
}
#if IMM_DEBUG > 0
#define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\
y, __FUNCTION__, __LINE__); imm_fail_func(x,y);
static inline void imm_fail_func(int host_no, int error_code)
#else
static inline void imm_fail(int host_no, int error_code)
#endif
{
/* If we fail a device then we trash status / message bytes */
if (imm_hosts[host_no].cur_cmd) {
imm_hosts[host_no].cur_cmd->result = error_code << 16;
imm_hosts[host_no].failed = 1;
}
}
/*
* 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 unsigned char imm_wait(int host_no)
{
int k;
unsigned short ppb = IMM_BASE(host_no);
unsigned char r;
w_ctr(ppb, 0x0c);
k = IMM_SPIN_TMO;
do {
r = r_str(ppb);
k--;
udelay(1);
}
while (!(r & 0x80) && (k));
/*
* STR register (LPT base+1) to SCSI mapping:
*
* STR imm imm
* ===================================
* 0x80 S_REQ S_REQ
* 0x40 !S_BSY (????)
* 0x20 !S_CD !S_CD
* 0x10 !S_IO !S_IO
* 0x08 (????) !S_BSY
*
* imm imm meaning
* ==================================
* 0xf0 0xb8 Bit mask
* 0xc0 0x88 ZIP wants more data
* 0xd0 0x98 ZIP wants to send more data
* 0xe0 0xa8 ZIP is expecting SCSI command data
* 0xf0 0xb8 end of transfer, ZIP is sending status
*/
w_ctr(ppb, 0x04);
if (k)
return (r & 0xb8);
/* Counter expired - Time out occurred */
imm_fail(host_no, DID_TIME_OUT);
printk("imm timeout in imm_wait\n");
return 0; /* command timed out */
}
static int imm_negotiate(imm_struct * tmp)
{
/*
* The following is supposedly the IEEE 1284-1994 negotiate
* sequence. I have yet to obtain a copy of the above standard
* so this is a bit of a guess...
*
* A fair chunk of this is based on the Linux parport implementation
* of IEEE 1284.
*
* Return 0 if data available
* 1 if no data available
*/
unsigned short base = tmp->base;
unsigned char a, mode;
switch (tmp->mode) {
case IMM_NIBBLE:
mode = 0x00;
break;
case IMM_PS2:
mode = 0x01;
break;
default:
return 0;
}
w_ctr(base, 0x04);
udelay(5);
w_dtr(base, mode);
udelay(100);
w_ctr(base, 0x06);
udelay(5);
a = (r_str(base) & 0x20) ? 0 : 1;
udelay(5);
w_ctr(base, 0x07);
udelay(5);
w_ctr(base, 0x06);
if (a) {
printk("IMM: IEEE1284 negotiate indicates no data available.\n");
imm_fail(tmp->host, DID_ERROR);
}
return a;
}
/*
* Clear EPP timeout bit.
*/
static inline void epp_reset(unsigned short ppb)
{
int i;
i = r_str(ppb);
w_str(ppb, i);
w_str(ppb, i & 0xfe);
}
/*
* Wait for empty ECP fifo (if we are in ECP fifo mode only)
*/
static inline void ecp_sync(unsigned short hostno)
{
int i, ppb_hi=IMM_BASE_HI(hostno);
if (ppb_hi == 0) return;
if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */
for (i = 0; i < 100; i++) {
if (r_ecr(ppb_hi) & 0x01)
return;
udelay(5);
}
printk("imm: ECP sync failed as data still present in FIFO.\n");
}
}
static int imm_byte_out(unsigned short base, const char *buffer, int len)
{
int i;
w_ctr(base, 0x4); /* apparently a sane mode */
for (i = len >> 1; i; i--) {
w_dtr(base, *buffer++);
w_ctr(base, 0x5); /* Drop STROBE low */
w_dtr(base, *buffer++);
w_ctr(base, 0x0); /* STROBE high + INIT low */
}
w_ctr(base, 0x4); /* apparently a sane mode */
return 1; /* All went well - we hope! */
}
static int imm_nibble_in(unsigned short base, char *buffer, int len)
{
unsigned char l;
int i;
/*
* The following is based on documented timing signals
*/
w_ctr(base, 0x4);
for (i = len; i; i--) {
w_ctr(base, 0x6);
l = (r_str(base) & 0xf0) >> 4;
w_ctr(base, 0x5);
*buffer++ = (r_str(base) & 0xf0) | l;
w_ctr(base, 0x4);
}
return 1; /* All went well - we hope! */
}
static int imm_byte_in(unsigned short base, char *buffer, int len)
{
int i;
/*
* The following is based on documented timing signals
*/
w_ctr(base, 0x4);
for (i = len; i; i--) {
w_ctr(base, 0x26);
*buffer++ = r_dtr(base);
w_ctr(base, 0x25);
}
return 1; /* All went well - we hope! */
}
static int imm_out(int host_no, char *buffer, int len)
{
int r;
unsigned short ppb = IMM_BASE(host_no);
r = imm_wait(host_no);
/*
* Make sure that:
* a) the SCSI bus is BUSY (device still listening)
* b) the device is listening
*/
if ((r & 0x18) != 0x08) {
imm_fail(host_no, DID_ERROR);
printk("IMM: returned SCSI status %2x\n", r);
return 0;
}
switch (imm_hosts[host_no].mode) {
case IMM_EPP_32:
case IMM_EPP_16:
case IMM_EPP_8:
epp_reset(ppb);
w_ctr(ppb, 0x4);
#ifdef CONFIG_SCSI_IZIP_EPP16
if (!(((long) buffer | len) & 0x01))
outsw(ppb + 4, buffer, len >> 1);
#else
if (!(((long) buffer | len) & 0x03))
outsl(ppb + 4, buffer, len >> 2);
#endif
else
outsb(ppb + 4, buffer, len);
w_ctr(ppb, 0xc);
r = !(r_str(ppb) & 0x01);
w_ctr(ppb, 0xc);
ecp_sync(host_no);
break;
case IMM_NIBBLE:
case IMM_PS2:
/* 8 bit output, with a loop */
r = imm_byte_out(ppb, buffer, len);
break;
default:
printk("IMM: bug in imm_out()\n");
r = 0;
}
return r;
}
static int imm_in(int host_no, char *buffer, int len)
{
int r;
unsigned short ppb = IMM_BASE(host_no);
r = imm_wait(host_no);
/*
* Make sure that:
* a) the SCSI bus is BUSY (device still listening)
* b) the device is sending data
*/
if ((r & 0x18) != 0x18) {
imm_fail(host_no, DID_ERROR);
return 0;
}
switch (imm_hosts[host_no].mode) {
case IMM_NIBBLE:
/* 4 bit input, with a loop */
r = imm_nibble_in(ppb, buffer, len);
w_ctr(ppb, 0xc);
break;
case IMM_PS2:
/* 8 bit input, with a loop */
r = imm_byte_in(ppb, buffer, len);
w_ctr(ppb, 0xc);
break;
case IMM_EPP_32:
case IMM_EPP_16:
case IMM_EPP_8:
epp_reset(ppb);
w_ctr(ppb, 0x24);
#ifdef CONFIG_SCSI_IZIP_EPP16
if (!(((long) buffer | len) & 0x01))
insw(ppb + 4, buffer, len >> 1);
#else
if (!(((long) buffer | len) & 0x03))
insl(ppb + 4, buffer, len >> 2);
#endif
else
insb(ppb + 4, buffer, len);
w_ctr(ppb, 0x2c);
r = !(r_str(ppb) & 0x01);
w_ctr(ppb, 0x2c);
ecp_sync(host_no);
break;
default:
printk("IMM: bug in imm_ins()\n");
r = 0;
break;
}
return r;
}
static int imm_cpp(unsigned short ppb, unsigned char b)
{
/*
* Comments on udelay values refer to the
* Command Packet Protocol (CPP) timing diagram.
*/
unsigned char s1, s2, s3;
w_ctr(ppb, 0x0c);
udelay(2); /* 1 usec - infinite */
w_dtr(ppb, 0xaa);
udelay(10); /* 7 usec - infinite */
w_dtr(ppb, 0x55);
udelay(10); /* 7 usec - infinite */
w_dtr(ppb, 0x00);
udelay(10); /* 7 usec - infinite */
w_dtr(ppb, 0xff);
udelay(10); /* 7 usec - infinite */
s1 = r_str(ppb) & 0xb8;
w_dtr(ppb, 0x87);
udelay(10); /* 7 usec - infinite */
s2 = r_str(ppb) & 0xb8;
w_dtr(ppb, 0x78);
udelay(10); /* 7 usec - infinite */
s3 = r_str(ppb) & 0x38;
/*
* Values for b are:
* 0000 00aa Assign address aa to current device
* 0010 00aa Select device aa in EPP Winbond mode
* 0010 10aa Select device aa in EPP mode
* 0011 xxxx Deselect all devices
* 0110 00aa Test device aa
* 1101 00aa Select device aa in ECP mode
* 1110 00aa Select device aa in Compatible mode
*/
w_dtr(ppb, b);
udelay(2); /* 1 usec - infinite */
w_ctr(ppb, 0x0c);
udelay(10); /* 7 usec - infinite */
w_ctr(ppb, 0x0d);
udelay(2); /* 1 usec - infinite */
w_ctr(ppb, 0x0c);
udelay(10); /* 7 usec - infinite */
w_dtr(ppb, 0xff);
udelay(10); /* 7 usec - infinite */
/*
* The following table is electrical pin values.
* (BSY is inverted at the CTR register)
*
* BSY ACK POut SEL Fault
* S1 0 X 1 1 1
* S2 1 X 0 1 1
* S3 L X 1 1 S
*
* L => Last device in chain
* S => Selected
*
* Observered values for S1,S2,S3 are:
* Disconnect => f8/58/78
* Connect => f8/58/70
*/
if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30))
return 1; /* Connected */
if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38))
return 0; /* Disconnected */
return -1; /* No device present */
}
static inline int imm_connect(int host_no, int flag)
{
unsigned short ppb = IMM_BASE(host_no);
imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
imm_cpp(ppb, 0x30); /* Disconnect all devices */
if ((imm_hosts[host_no].mode == IMM_EPP_8) ||
(imm_hosts[host_no].mode == IMM_EPP_16) ||
(imm_hosts[host_no].mode == IMM_EPP_32))
return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */
return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */
}
static void imm_disconnect(int host_no)
{
unsigned short ppb = IMM_BASE(host_no);
imm_cpp(ppb, 0x30); /* Disconnect all devices */
}
static int imm_select(int host_no, int target)
{
int k;
unsigned short ppb = IMM_BASE(host_no);
/*
* Firstly we want to make sure there is nothing
* holding onto the SCSI bus.
*/
w_ctr(ppb, 0xc);
k = IMM_SELECT_TMO;
do {
k--;
} while ((r_str(ppb) & 0x08) && (k));
if (!k)
return 0;
/*
* Now assert the SCSI ID (HOST and TARGET) on the data bus
*/
w_ctr(ppb, 0x4);
w_dtr(ppb, 0x80 | (1 << target));
udelay(1);
/*
* Deassert SELIN first followed by STROBE
*/
w_ctr(ppb, 0xc);
w_ctr(ppb, 0xd);
/*
* ACK should drop low while SELIN is deasserted.
* FAULT should drop low when the SCSI device latches the bus.
*/
k = IMM_SELECT_TMO;
do {
k--;
}
while (!(r_str(ppb) & 0x08) && (k));
/*
* Place the interface back into a sane state (status mode)
*/
w_ctr(ppb, 0xc);
return (k) ? 1 : 0;
}
static int imm_init(int host_no)
{
int retv;
#if defined(CONFIG_PARPORT) || defined(CONFIG_PARPORT_MODULE)
if (imm_pb_claim(host_no))
while (imm_hosts[host_no].p_busy)
schedule(); /* We can safe schedule here */
#endif
retv = imm_connect(host_no, 0);
if (retv == 1) {
imm_reset_pulse(IMM_BASE(host_no));
udelay(1000); /* Delay to allow devices to settle */
imm_disconnect(host_no);
udelay(1000); /* Another delay to allow devices to settle */
retv = device_check(host_no);
imm_pb_release(host_no);
return retv;
}
imm_pb_release(host_no);
return 1;
}
static inline int imm_send_command(Scsi_Cmnd * cmd)
{
int host_no = cmd->host->unique_id;
int k;
/* NOTE: IMM uses byte pairs */
for (k = 0; k < cmd->cmd_len; k += 2)
if (!imm_out(host_no, &cmd->cmnd[k], 2))
return 0;
return 1;
}
/*
* 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 imm_completion(Scsi_Cmnd * cmd)
{
/* Return codes:
* -1 Error
* 0 Told to schedule
* 1 Finished data transfer
*/
int host_no = cmd->host->unique_id;
unsigned short ppb = IMM_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 imm_wait.
*/
w_ctr(ppb, 0x0c);
r = (r_str(ppb) & 0xb8);
/*
* while (device is not ready to send status byte)
* loop;
*/
while (r != (unsigned char) 0xb8) {
/*
* If we have been running for more than a full timer tick
* then take a rest.
*/
if (time_after(jiffies, start_jiffies + 1))
return 0;
/*
* FAIL if:
* a) Drive status is screwy (!ready && !present)
* b) Drive is requesting/sending more data than expected
*/
if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) {
imm_fail(host_no, DID_ERROR);
return -1; /* ERROR_RETURN */
}
/* determine if we should use burst I/O */
if (imm_hosts[host_no].rd == 0) {
fast = (bulk && (cmd->SCp.this_residual >= IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2;
status = imm_out(host_no, cmd->SCp.ptr, fast);
} else {
fast = (bulk && (cmd->SCp.this_residual >= IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1;
status = imm_in(host_no, cmd->SCp.ptr, fast);
}
cmd->SCp.ptr += fast;
cmd->SCp.this_residual -= fast;
if (!status) {
imm_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;
/*
* Make sure that we transfer even number of bytes
* otherwise it makes imm_byte_out() messy.
*/
if (cmd->SCp.this_residual & 0x01)
cmd->SCp.this_residual++;
}
}
/* Now check to see if the drive is ready to comunicate */
w_ctr(ppb, 0x0c);
r = (r_str(ppb) & 0xb8);
/* 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 imm_command(Scsi_Cmnd * cmd)
{
static int first_pass = 1;
int host_no = cmd->host->unique_id;
if (first_pass) {
printk("imm: using non-queuing interface\n");
first_pass = 0;
}
if (imm_hosts[host_no].cur_cmd) {
printk("IMM: bug in imm_command\n");
return 0;
}
imm_hosts[host_no].failed = 0;
imm_hosts[host_no].jstart = jiffies;
imm_hosts[host_no].cur_cmd = cmd;
cmd->result = DID_ERROR << 16; /* default return code */
cmd->SCp.phase = 0;
imm_pb_claim(host_no);
while (imm_engine(&imm_hosts[host_no], cmd))
schedule();
if (cmd->SCp.phase) /* Only disconnect if we have connected */
imm_disconnect(cmd->host->unique_id);
imm_pb_release(host_no);
imm_hosts[host_no].cur_cmd = 0;
return cmd->result;
}
/*
* Since the IMM 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 imm_interrupt(void *data)
{
imm_struct *tmp = (imm_struct *) data;
Scsi_Cmnd *cmd = tmp->cur_cmd;
unsigned long flags;
if (!cmd) {
printk("IMM: bug in imm_interrupt\n");
return;
}
if (imm_engine(tmp, cmd)) {
tmp->imm_tq.data = (void *) tmp;
tmp->imm_tq.sync = 0;
queue_task(&tmp->imm_tq, &tq_timer);
return;
}
/* Command must of completed hence it is safe to let go... */
#if IMM_DEBUG > 0
switch ((cmd->result >> 16) & 0xff) {
case DID_OK:
break;
case DID_NO_CONNECT:
printk("imm: no device at SCSI ID %i\n", cmd->target);
break;
case DID_BUS_BUSY:
printk("imm: BUS BUSY - EPP timeout detected\n");
break;
case DID_TIME_OUT:
printk("imm: unknown timeout\n");
break;
case DID_ABORT:
printk("imm: told to abort\n");
break;
case DID_PARITY:
printk("imm: parity error (???)\n");
break;
case DID_ERROR:
printk("imm: internal driver error\n");
break;
case DID_RESET:
printk("imm: told to reset device\n");
break;
case DID_BAD_INTR:
printk("imm: bad interrupt (???)\n");
break;
default:
printk("imm: bad return code (%02x)\n", (cmd->result >> 16) & 0xff);
}
#endif
if (cmd->SCp.phase > 1)
imm_disconnect(cmd->host->unique_id);
if (cmd->SCp.phase > 0)
imm_pb_release(cmd->host->unique_id);
spin_lock_irqsave(&io_request_lock, flags);
tmp->cur_cmd = 0;
cmd->scsi_done(cmd);
spin_unlock_irqrestore(&io_request_lock, flags);
return;
}
static int imm_engine(imm_struct * tmp, Scsi_Cmnd * cmd)
{
int host_no = cmd->host->unique_id;
unsigned short ppb = IMM_BASE(host_no);
unsigned char l = 0, h = 0;
int retv, x;
/* First check for any errors that may of occurred
* 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
*/
imm_fail(host_no, DID_BUS_BUSY);
return 0;
}
return 1; /* wait until imm_wakeup claims parport */
/* Phase 1 - Connected */
case 1:
imm_connect(host_no, CONNECT_EPP_MAYBE);
cmd->SCp.phase++;
/* Phase 2 - We are now talking to the scsi bus */
case 2:
if (!imm_select(host_no, cmd->target)) {
imm_fail(host_no, DID_NO_CONNECT);
return 0;
}
cmd->SCp.phase++;
/* Phase 3 - Ready to accept a command */
case 3:
w_ctr(ppb, 0x0c);
if (!(r_str(ppb) & 0x80))
return 1;
if (!imm_send_command(cmd))
return 0;
cmd->SCp.phase++;
/* Phase 4 - Setup scatter/gather buffers */
case 4:
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++;
if (cmd->SCp.this_residual & 0x01)
cmd->SCp.this_residual++;
/* Phase 5 - Pre-Data transfer stage */
case 5:
/* Spin lock for BUSY */
w_ctr(ppb, 0x0c);
if (!(r_str(ppb) & 0x80))
return 1;
/* Require negotiation for read requests */
x = (r_str(ppb) & 0xb8);
tmp->rd = (x & 0x10) ? 1 : 0;
tmp->dp = (x & 0x20) ? 0 : 1;
if ((tmp->dp) && (tmp->rd))
if (imm_negotiate(tmp))
return 0;
cmd->SCp.phase++;
/* Phase 6 - Data transfer stage */
case 6:
/* Spin lock for BUSY */
w_ctr(ppb, 0x0c);
if (!(r_str(ppb) & 0x80))
return 1;
if (tmp->dp) {
retv = imm_completion(cmd);
if (retv == -1)
return 0;
if (retv == 0)
return 1;
}
cmd->SCp.phase++;
/* Phase 7 - Post data transfer stage */
case 7:
if ((tmp->dp) && (tmp->rd)) {
if ((tmp->mode == IMM_NIBBLE) || (tmp->mode == IMM_PS2)) {
w_ctr(ppb, 0x4);
w_ctr(ppb, 0xc);
w_ctr(ppb, 0xe);
w_ctr(ppb, 0x4);
}
}
cmd->SCp.phase++;
/* Phase 8 - Read status/message */
case 8:
/* Check for data overrun */
if (imm_wait(host_no) != (unsigned char) 0xb8) {
imm_fail(host_no, DID_ERROR);
return 0;
}
if (imm_negotiate(tmp))
return 0;
if (imm_in(host_no, &l, 1)) { /* read status byte */
/* Check for optional message byte */
if (imm_wait(host_no) == (unsigned char) 0xb8)
imm_in(host_no, &h, 1);
cmd->result = (DID_OK << 16) + (l & STATUS_MASK);
}
if ((tmp->mode == IMM_NIBBLE) || (tmp->mode == IMM_PS2)) {
w_ctr(ppb, 0x4);
w_ctr(ppb, 0xc);
w_ctr(ppb, 0xe);
w_ctr(ppb, 0x4);
}
return 0; /* Finished */
break;
default:
printk("imm: Invalid scsi phase\n");
}
return 0;
}
int imm_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
{
int host_no = cmd->host->unique_id;
if (imm_hosts[host_no].cur_cmd) {
printk("IMM: bug in imm_queuecommand\n");
return 0;
}
imm_hosts[host_no].failed = 0;
imm_hosts[host_no].jstart = jiffies;
imm_hosts[host_no].cur_cmd = cmd;
cmd->scsi_done = done;
cmd->result = DID_ERROR << 16; /* default return code */
cmd->SCp.phase = 0; /* bus free */
imm_pb_claim(host_no);
imm_hosts[host_no].imm_tq.data = imm_hosts + host_no;
imm_hosts[host_no].imm_tq.sync = 0;
queue_task(&imm_hosts[host_no].imm_tq, &tq_immediate);
mark_bh(IMMEDIATE_BH);
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 imm_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]);
}
return 0;
}
int imm_abort(Scsi_Cmnd * cmd)
{
int host_no = cmd->host->unique_id;
/*
* 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 */
imm_hosts[host_no].cur_cmd = NULL; /* Forget the problem */
return SUCCESS;
break;
default: /* SCSI command sent, can not abort */
return FAILED;
break;
}
}
void imm_reset_pulse(unsigned int base)
{
w_ctr(base, 0x04);
w_dtr(base, 0x40);
udelay(1);
w_ctr(base, 0x0c);
w_ctr(base, 0x0d);
udelay(50);
w_ctr(base, 0x0c);
w_ctr(base, 0x04);
}
int imm_reset(Scsi_Cmnd * cmd)
{
int host_no = cmd->host->unique_id;
if (cmd->SCp.phase)
imm_disconnect(host_no);
imm_hosts[host_no].cur_cmd = NULL; /* Forget the problem */
imm_connect(host_no, CONNECT_NORMAL);
imm_reset_pulse(IMM_BASE(host_no));
udelay(1000); /* device settle delay */
imm_disconnect(host_no);
udelay(1000); /* device settle delay */
return SUCCESS;
}
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 = IMM_BASE(host_no);
unsigned char l;
old_mode = imm_hosts[host_no].mode;
for (loop = 0; loop < 8; loop++) {
/* Attempt to use EPP for Test Unit Ready */
if ((ppb & 0x0007) == 0x0000)
imm_hosts[host_no].mode = IMM_EPP_32;
second_pass:
imm_connect(host_no, CONNECT_EPP_MAYBE);
/* Select SCSI device */
if (!imm_select(host_no, loop)) {
imm_disconnect(host_no);
continue;
}
printk("imm: Found device at ID %i, Attempting to use %s\n", loop,
IMM_MODE_STRING[imm_hosts[host_no].mode]);
/* Send SCSI command */
status = 1;
w_ctr(ppb, 0x0c);
for (l = 0; (l < 3) && (status); l++)
status = imm_out(host_no, &cmd[l << 1], 2);
if (!status) {
imm_disconnect(host_no);
imm_connect(host_no, CONNECT_EPP_MAYBE);
imm_reset_pulse(IMM_BASE(host_no));
udelay(1000);
imm_disconnect(host_no);
udelay(1000);
if (imm_hosts[host_no].mode == IMM_EPP_32) {
imm_hosts[host_no].mode = old_mode;
goto second_pass;
}
printk("imm: 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 &= 0xb8;
if (l != 0xb8) {
imm_disconnect(host_no);
imm_connect(host_no, CONNECT_EPP_MAYBE);
imm_reset_pulse(IMM_BASE(host_no));
udelay(1000);
imm_disconnect(host_no);
udelay(1000);
if (imm_hosts[host_no].mode == IMM_EPP_32) {
imm_hosts[host_no].mode = old_mode;
goto second_pass;
}
printk("imm: Unable to establish communication, aborting driver load.\n");
return 1;
}
imm_disconnect(host_no);
printk("imm: Communication established at 0x%x with ID %i using %s\n", ppb, loop,
IMM_MODE_STRING[imm_hosts[host_no].mode]);
imm_connect(host_no, CONNECT_EPP_MAYBE);
imm_reset_pulse(IMM_BASE(host_no));
udelay(1000);
imm_disconnect(host_no);
udelay(1000);
return 0;
}
printk("imm: No devices found, aborting driver load.\n");
return 1;
}
MODULE_LICENSE("GPL");
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