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GNU Mach 1.4
/* 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, [email protected],
* under the terms of the GNU Public License.
*
* Current Maintainer: David Campbell (Perth, Western Australia)
* [email protected]
* [email protected]
*
* 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 PPA_CODE 1
#ifndef HAVE_PC87332
#define HAVE_PC87332 0
#endif
#define PPA_PROBE_SPP 0x0001
#define PPA_PROBE_PS2 0x0002
#define PPA_PROBE_ECR 0x0010
#define PPA_PROBE_EPP17 0x0100
#define PPA_PROBE_EPP19 0x0200
int port_probe(unsigned short);
#include <linux/blk.h>
#include "sd.h"
#include "hosts.h"
typedef struct {
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 failed:1; /* Failure flag */
} ppa_struct;
#define PPA_EMPTY \
{-1, /* base */ \
PPA_AUTODETECT, /* mode */ \
-1, /* host */ \
NULL, /* cur_cmd */ \
{0, 0, ppa_interrupt, NULL}, \
0, /* jstart */ \
0 /* failed */ \
}
#include "ppa.h"
#undef CONFIG_PARPORT
#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
int base[NO_HOSTS] =
{0x03bc, 0x0378, 0x0278, 0x0000};
#define parbus_base base
#define parbus_no NO_HOSTS
static inline int ppa_pb_claim(int host_no)
{
if (ppa_hosts[host_no].cur_cmd)
ppa_hosts[host_no].cur_cmd->SCp.phase++;
return 0;
}
/***************************************************************************
* Parallel port probing routines *
***************************************************************************/
#ifndef MODULE
/*
* Command line parameters (for built-in driver):
*
* Syntax: ppa=base[,mode[,use_sg]]
*
* For example: ppa=0x378 or ppa=0x378,0,3
*
*/
void ppa_setup(char *str, int *ints)
{
static int x = 0;
if (x == 0) { /* Disable ALL known ports */
int i;
for (i = 0; i < NO_HOSTS; i++)
parbus_base[i] = 0x0000;
}
switch (ints[0]) {
case 3:
ppa_sg = ints[3];
case 2:
ppa_hosts[x].mode = ints[2];
parbus_base[x] = ints[1];
break;
default:
printk("PPA: I only use between 2 to 3 parameters.\n");
break;
}
x++;
}
#else
Scsi_Host_Template driver_template = PPA;
#include "scsi_module.c"
#endif
/*
* Start of Chipset kludges
*/
#if HAVE_PC87332 > 0
#warning PC87332 Kludge code included
static inline int pc87332_port(int host_no)
{
/* A routine to detect and kludge pc87332 chipsets into the
* "optimum" mode for parallel port data transfer.
* This assumes EPP is better than ECP...
* (Which it is for disk drives but not printers and scanners)
*/
int base = ppa_hosts[host_no].base;
/* This is where an pc87332 can hide */
unsigned short index_addr[4] =
{
0x0398, 0x026e, 0x015c, 0x002e
};
/* Bits 0&1 of FAR (Function Address Register) which specify where
* the LPT port will show up at.
*/
unsigned short port_ref[4] =
{
0x378, 0x3bc, 0x278, 0xffff
};
unsigned char a;
int loop;
for (loop = 0; loop < 4; loop++) {
/* Clear the "wax" out of the pc87332, only needed after hard
* reset.
*/
inb(index_addr[loop]);
inb(index_addr[loop]);
inb(index_addr[loop]);
inb(index_addr[loop]);
/* Anyone home ?? */
outb(0xff, index_addr[loop]);
a = inb(index_addr[loop]);
switch (a) {
case (0x0f): /* PC87732 */
break;
case (0x1f): /* PC87306 */
break;
case (0x7f): /* PC87??? */
break;
default:
continue;
} /* Is this pc87332 on the desired port */
outb(0x01, index_addr[loop]);
a = inb(index_addr[loop] + 1);
if (port_ref[a & 0x03] != base)
continue;
/* Found a pc87332 */
printk("NatSemi PC87332 (or variant) at 0x%04x\n", base);
/* Try to enable EPP modes
* with hardware data direction
*/
if (base != 0x3bc) {
/* EPP 1.9 */
outb(0x04, index_addr[loop]);
a = inb(index_addr[loop] + 1);
printk("Old reg1 = %02x\n", a);
/* 0x01 for EPP 1.7, 0x03 for EPP 1.9, 0x0c for ECP */
a = (a & 0xf0) | 0x03;
outb(a, index_addr[loop] + 1);
outb(a, index_addr[loop] + 1);
/* Software data direction selection */
outb(0x02, index_addr[loop]);
a = inb(index_addr[loop] + 1);
printk("Old reg2 = %02x\n", a);
/* 0x80 for software, 0x00 for hardware */
a = (a & 0x7f) | 0x80;
outb(a, index_addr[loop] + 1);
outb(a, index_addr[loop] + 1);
ppa_hosts[host_no].mode = PPA_EPP_32;
} else {
/* There is not enough address space for the 0x3bc port
* to have EPP registers so we will kludge it into an
* ECP
* port to allow bi-directional byte mode...
*/
/* ECP */
outb(0x04, index_addr[loop]);
a = inb(index_addr[loop] + 1);
a = (a & 0xfb) | 0x06;
outb(a, index_addr[loop] + 1);
outb(a, index_addr[loop] + 1);
ppa_hosts[host_no].mode = PPA_PS2;
}
outb(0x04, index_addr[loop]);
a = inb(index_addr[loop] + 1);
return ppa_hosts[host_no].mode;
}
return 0;
}
#else
#define pc87332_port(x)
#endif /* HAVE_PC87332 */
static inline int generic_port(int host_no)
{
/* Generic parallel port detection
* This will try to discover if the port is
* EPP, ECP, PS/2 or NIBBLE (In that order, approx....)
*/
unsigned int save_ctr, save_ecr, r;
int ppb = PPA_BASE(host_no);
save_ctr = r_ctr(ppb);
save_ecr = r_ecr(ppb);
r = port_probe(ppb);
w_ecr(ppb, save_ecr);
w_ctr(ppb, save_ctr);
if (r & PPA_PROBE_SPP)
ppa_hosts[host_no].mode = PPA_NIBBLE;
if (r & PPA_PROBE_PS2) {
ppa_hosts[host_no].mode = PPA_PS2;
if (r & PPA_PROBE_ECR)
w_ecr(ppb, 0x20);
}
if ((r & PPA_PROBE_EPP17) || (r & PPA_PROBE_EPP19)) {
/* ppa_hosts[host_no].mode = PPA_EPP_32; */
if (r & PPA_PROBE_ECR)
w_ecr(ppb, 0x80);
}
return ppa_hosts[host_no].mode;
}
int ppa_detect(Scsi_Host_Template * host)
{
struct Scsi_Host *hreg;
int ports;
int i, nhosts;
printk("ppa: Version %s\n", PPA_VERSION);
nhosts = 0;
for (i = 0; i < parbus_no; i++) {
if (parbus_base[i] == 0x0000)
continue;
ppa_hosts[i].base = parbus_base[i];
/* sanity checks */
if (check_region(parbus_base[i],
(parbus_base[i] == 0x03bc) ? 3 : 8))
continue;
pc87332_port(i);
if (!generic_port(i))
continue;
if (ppa_init(i))
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;
}
request_region(ppa_hosts[i].base, ports, "ppa");
host->can_queue = PPA_CAN_QUEUE;
host->sg_tablesize = ppa_sg;
hreg = scsi_register(host, 0);
hreg->io_port = ppa_hosts[i].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 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;
return 0;
}
static inline int ppa_proc_write(int hostno, char *buffer, int length)
{
unsigned long x;
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 len = 0;
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, "Port : 0x%04x\n", ppa_hosts[i].base);
len += sprintf(buffer + len, "Mode : %s\n", PPA_MODE_STRING[ppa_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;
} /* end of ppa.c */
static int device_check(int host_no);
#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
{
/* 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;
}
}
/*
* 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 ppa_wait(int host_no)
{
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 occurred */
ppa_fail(host_no, DID_TIME_OUT);
printk("ppa timeout in ppa_wait\n");
return 0; /* command timed out */
}
/*
* output a string, in whatever mode is available, according to the
* PPA protocol.
*/
static inline void epp_reset(unsigned short ppb)
{
int i;
i = r_str(ppb);
w_str(ppb, i);
w_str(ppb, i & 0xfe);
}
static inline void ecp_sync(unsigned short ppb)
{
int i;
if ((r_ecr(ppb) & 0xe0) != 0x80)
return;
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");
}
/*
* 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.
*/
#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)
{
int i;
for (i = len; i; i--) {
w_dtr(base, *buffer++);
w_ctr(base, 0xe);
w_ctr(base, 0xc);
}
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)
{
int i;
for (i = len; i; i--) {
*buffer++ = r_dtr(base);
w_ctr(base, 0x27);
w_ctr(base, 0x25);
}
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 base, char *buffer, int len)
{
for (; len; len--) {
unsigned char h;
w_ctr(base, 0x4);
h = r_str(base) & 0xf0;
w_ctr(base, 0x6);
*buffer++ = h | ((r_str(base) & 0xf0) >> 4);
}
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
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);
#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
if (inb(str_p) & 0x01)
return 0;
#endif
}
return 1;
}
static int ppa_out(int host_no, char *buffer, int len)
{
int r;
unsigned short ppb = PPA_BASE(host_no);
r = ppa_wait(host_no);
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);
#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
r = ppa_epp_out(ppb + 4, ppb + 1, buffer, len);
#else
if (!(((long) buffer | len) & 0x03))
outsl(ppb + 4, buffer, len >> 2);
else
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);
#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
if (inb(str_p) & 0x01)
return 0;
#endif
}
return 1;
}
static int ppa_in(int host_no, char *buffer, int len)
{
int r;
unsigned short ppb = PPA_BASE(host_no);
r = ppa_wait(host_no);
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);
#ifdef CONFIG_SCSI_PPA_HAVE_PEDANTIC
r = ppa_epp_in(ppb + 4, ppb + 1, buffer, len);
#else
if (!(((long) buffer | len) & 0x03))
insl(ppb + 4, buffer, len >> 2);
else
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 void ppa_disconnect(int host_no)
{
unsigned short ppb = PPA_BASE(host_no);
ppa_d_pulse(ppb, 0);
ppa_d_pulse(ppb, 0x3c);
ppa_d_pulse(ppb, 0x20);
ppa_d_pulse(ppb, 0xf);
}
static inline void ppa_c_pulse(unsigned short ppb, unsigned char b)
{
w_dtr(ppb, b);
w_ctr(ppb, 0x4);
w_ctr(ppb, 0x6);
w_ctr(ppb, 0x4);
w_ctr(ppb, 0xc);
}
static inline void ppa_connect(int host_no, int flag)
{
unsigned short ppb = PPA_BASE(host_no);
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);
}
static int ppa_select(int host_no, int target)
{
int k;
unsigned short ppb = PPA_BASE(host_no);
/*
* 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;
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;
}
/*
* 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 retv;
unsigned short ppb = PPA_BASE(host_no);
ppa_disconnect(host_no);
ppa_connect(host_no, CONNECT_NORMAL);
retv = 2; /* Failed */
w_ctr(ppb, 0xe);
if ((r_str(ppb) & 0x08) == 0x08)
retv--;
w_ctr(ppb, 0xc);
if ((r_str(ppb) & 0x08) == 0x00)
retv--;
/* 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 (!retv)
retv = device_check(host_no);
return retv;
}
static inline int ppa_send_command(Scsi_Cmnd * cmd)
{
int host_no = cmd->host->unique_id;
int k;
w_ctr(PPA_BASE(host_no), 0x0c);
for (k = 0; k < cmd->cmd_len; k++)
if (!ppa_out(host_no, &cmd->cmnd[k], 1))
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 ppa_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 = 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);
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 (((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;
if (r == (unsigned char) 0xc0)
status = ppa_out(host_no, cmd->SCp.ptr, fast);
else
status = ppa_in(host_no, cmd->SCp.ptr, fast);
cmd->SCp.ptr += fast;
cmd->SCp.this_residual -= fast;
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 */
}
/*
* 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;
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
if (cmd->SCp.phase > 1)
ppa_disconnect(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 have 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
*/
ppa_fail(host_no, DID_BUS_BUSY);
return 0;
}
return 1; /* wait until 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 */
}
cmd->SCp.phase++;
}
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;
}
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;
}
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;
}
/*
* Apparently 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)
{
/*
* 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;
int ppb = PPA_BASE(host_no);
/*
* 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;
}
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;
}
#define PPA_ID "ppa: "
int port_probe(unsigned short port)
{
int retv = 0;
unsigned char a, b, c;
unsigned int i, j;
printk(PPA_ID "Probing port %04x\n", port);
/* ##### ###### ######
* # # # # # #
* # # # # #
* ##### ###### ######
* # # #
* # # # #
* ##### # #
*/
outb(0x0c, port + 0x402);
outb(0x0c, port + 0x002);
outb(0x55, port);
a = inb(port);
if (a != 0x55)
return retv;
printk(PPA_ID " SPP port present\n");
retv += PPA_PROBE_SPP;
/* ####### ##### ######
* # # # # #
* # # # #
* ##### # ######
* # # #
* # # # #
* ####### ##### #
*/
for (i = 1024; i > 0; i--) { /* clear at most 1k of data from FIFO */
a = inb(port + 0x402);
if ((a & 0x03) == 0x03)
goto no_ecp;
if (a & 0x01)
break;
inb(port + 0x400); /* Remove byte from FIFO */
}
if (i <= 0)
goto no_ecp;
b = a ^ 3;
outb(b, port + 0x402);
c = inb(port + 0x402);
if (a == c) {
outb(0xc0, port + 0x402); /* FIFO test */
j = 0;
while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
inb(port + 0x400);
j++;
}
if (j >= 1024)
goto no_ecp;
i = 0;
j = 0;
while (!(inb(port + 0x402) & 0x02) && (j < 1024)) {
outb(0x00, port + 0x400);
i++;
j++;
}
if (j >= 1024)
goto no_ecp;
j = 0;
while (!(inb(port + 0x402) & 0x01) && (j < 1024)) {
inb(port + 0x400);
j++;
}
if (j >= 1024)
goto no_ecp;
printk(PPA_ID " ECP with a %i byte FIFO present\n", i);
retv += PPA_PROBE_ECR;
}
/* ###### ##### #####
* # # # # # #
* # # # #
* ###### ##### #####
* # # #
* # # # #
* # ##### #######
*/
no_ecp:
if (retv & PPA_PROBE_ECR)
outb(0x20, port + 0x402);
outb(0x55, port);
outb(0x0c, port + 2);
a = inb(port);
outb(0x55, port);
outb(0x2c, port + 2);
b = inb(port);
if (a != b) {
printk(PPA_ID " PS/2 bidirectional port present\n");
retv += PPA_PROBE_PS2;
}
/* ####### ###### ######
* # # # # #
* # # # # #
* ##### ###### ######
* # # #
* # # #
* ####### # #
*/
if (port & 0x007) {
printk(PPA_ID " EPP not supported at this address\n");
return retv;
}
if (retv & PPA_PROBE_ECR) {
for (i = 0x00; i < 0x80; i += 0x20) {
outb(i, port + 0x402);
a = inb(port + 1);
outb(a, port + 1);
outb(a & 0xfe, port + 1);
a = inb(port + 1);
if (!(a & 0x01)) {
printk(PPA_ID " Failed Intel bug check. (Phony EPP in ECP)\n");
return retv;
}
}
printk(PPA_ID " Passed Intel bug check.\n");
outb(0x80, port + 0x402);
}
a = inb(port + 1);
outb(a, port + 1);
outb(a & 0xfe, port + 1);
a = inb(port + 1);
if (a & 0x01) {
outb(0x0c, port + 0x402);
outb(0x0c, port + 0x002);
return retv;
}
outb(0x04, port + 2);
inb(port + 4);
a = inb(port + 1);
outb(a, port + 1);
outb(a & 0xfe, port + 1);
if (a & 0x01) {
printk(PPA_ID " EPP 1.9 with hardware direction protocol\n");
retv += PPA_PROBE_EPP19;
} else {
/* The EPP timeout bit was not set, this could either be:
* EPP 1.7
* EPP 1.9 with software direction
*/
outb(0x24, port + 2);
inb(port + 4);
a = inb(port + 1);
outb(a, port + 1);
outb(a & 0xfe, port + 1);
if (a & 0x01) {
printk(PPA_ID " EPP 1.9 with software direction protocol\n");
retv += PPA_PROBE_EPP19;
} else {
printk(PPA_ID " EPP 1.7\n");
retv += PPA_PROBE_EPP17;
}
}
outb(0x0c, port + 0x402);
outb(0x0c, port + 0x002);
return retv;
}
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