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linux/drivers/block/paride/bpck.c
Colin Ian King 5efac89c84 paride: remove redundant variable n 
Variable n is being assigned but is never used hence it is redundant
and can be removed. Also put spacing between variables in declaration
to clean up checkpatch warnings.

Cleans up clang warning:
warning: variable 'n' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-07-09 09:07:53 -06:00

477 lines
9.3 KiB
C
Raw Blame History

/*
bpck.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
Under the terms of the GNU General Public License.
bpck.c is a low-level protocol driver for the MicroSolutions
"backpack" parallel port IDE adapter.
*/
/* Changes:
1.01 GRG 1998.05.05 init_proto, release_proto, pi->delay
1.02 GRG 1998.08.15 default pi->delay returned to 4
*/
#define BPCK_VERSION "1.02"
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <asm/io.h>
#include "paride.h"
#undef r2
#undef w2
#define PC pi->private
#define r2() (PC=(in_p(2) & 0xff))
#define w2(byte) {out_p(2,byte); PC = byte;}
#define t2(pat) {PC ^= pat; out_p(2,PC);}
#define e2() {PC &= 0xfe; out_p(2,PC);}
#define o2() {PC |= 1; out_p(2,PC);}
#define j44(l,h) (((l>>3)&0x7)|((l>>4)&0x8)|((h<<1)&0x70)|(h&0x80))
/* cont = 0 - access the IDE register file
cont = 1 - access the IDE command set
cont = 2 - use internal bpck register addressing
*/
static int cont_map[3] = { 0x40, 0x48, 0 };
static int bpck_read_regr( PIA *pi, int cont, int regr )
{ int r, l, h;
r = regr + cont_map[cont];
switch (pi->mode) {
case 0: w0(r & 0xf); w0(r); t2(2); t2(4);
l = r1();
t2(4);
h = r1();
return j44(l,h);
case 1: w0(r & 0xf); w0(r); t2(2);
e2(); t2(0x20);
t2(4); h = r0();
t2(1); t2(0x20);
return h;
case 2:
case 3:
case 4: w0(r); w2(9); w2(0); w2(0x20);
h = r4();
w2(0);
return h;
}
return -1;
}
static void bpck_write_regr( PIA *pi, int cont, int regr, int val )
{ int r;
r = regr + cont_map[cont];
switch (pi->mode) {
case 0:
case 1: w0(r);
t2(2);
w0(val);
o2(); t2(4); t2(1);
break;
case 2:
case 3:
case 4: w0(r); w2(9); w2(0);
w0(val); w2(1); w2(3); w2(0);
break;
}
}
/* These macros access the bpck registers in native addressing */
#define WR(r,v) bpck_write_regr(pi,2,r,v)
#define RR(r) (bpck_read_regr(pi,2,r))
static void bpck_write_block( PIA *pi, char * buf, int count )
{ int i;
switch (pi->mode) {
case 0: WR(4,0x40);
w0(0x40); t2(2); t2(1);
for (i=0;i<count;i++) { w0(buf[i]); t2(4); }
WR(4,0);
break;
case 1: WR(4,0x50);
w0(0x40); t2(2); t2(1);
for (i=0;i<count;i++) { w0(buf[i]); t2(4); }
WR(4,0x10);
break;
case 2: WR(4,0x48);
w0(0x40); w2(9); w2(0); w2(1);
for (i=0;i<count;i++) w4(buf[i]);
w2(0);
WR(4,8);
break;
case 3: WR(4,0x48);
w0(0x40); w2(9); w2(0); w2(1);
for (i=0;i<count/2;i++) w4w(((u16 *)buf)[i]);
w2(0);
WR(4,8);
break;
case 4: WR(4,0x48);
w0(0x40); w2(9); w2(0); w2(1);
for (i=0;i<count/4;i++) w4l(((u32 *)buf)[i]);
w2(0);
WR(4,8);
break;
}
}
static void bpck_read_block( PIA *pi, char * buf, int count )
{ int i, l, h;
switch (pi->mode) {
case 0: WR(4,0x40);
w0(0x40); t2(2);
for (i=0;i<count;i++) {
t2(4); l = r1();
t2(4); h = r1();
buf[i] = j44(l,h);
}
WR(4,0);
break;
case 1: WR(4,0x50);
w0(0x40); t2(2); t2(0x20);
for(i=0;i<count;i++) { t2(4); buf[i] = r0(); }
t2(1); t2(0x20);
WR(4,0x10);
break;
case 2: WR(4,0x48);
w0(0x40); w2(9); w2(0); w2(0x20);
for (i=0;i<count;i++) buf[i] = r4();
w2(0);
WR(4,8);
break;
case 3: WR(4,0x48);
w0(0x40); w2(9); w2(0); w2(0x20);
for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
w2(0);
WR(4,8);
break;
case 4: WR(4,0x48);
w0(0x40); w2(9); w2(0); w2(0x20);
for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l();
w2(0);
WR(4,8);
break;
}
}
static int bpck_probe_unit ( PIA *pi )
{ int o1, o0, f7, id;
int t, s;
id = pi->unit;
s = 0;
w2(4); w2(0xe); r2(); t2(2);
o1 = r1()&0xf8;
o0 = r0();
w0(255-id); w2(4); w0(id);
t2(8); t2(8); t2(8);
t2(2); t = r1()&0xf8;
f7 = ((id % 8) == 7);
if ((f7) || (t != o1)) { t2(2); s = r1()&0xf8; }
if ((t == o1) && ((!f7) || (s == o1))) {
w2(0x4c); w0(o0);
return 0;
}
t2(8); w0(0); t2(2); w2(0x4c); w0(o0);
return 1;
}
static void bpck_connect ( PIA *pi )
{ pi->saved_r0 = r0();
w0(0xff-pi->unit); w2(4); w0(pi->unit);
t2(8); t2(8); t2(8);
t2(2); t2(2);
switch (pi->mode) {
case 0: t2(8); WR(4,0);
break;
case 1: t2(8); WR(4,0x10);
break;
case 2:
case 3:
case 4: w2(0); WR(4,8);
break;
}
WR(5,8);
if (pi->devtype == PI_PCD) {
WR(0x46,0x10); /* fiddle with ESS logic ??? */
WR(0x4c,0x38);
WR(0x4d,0x88);
WR(0x46,0xa0);
WR(0x41,0);
WR(0x4e,8);
}
}
static void bpck_disconnect ( PIA *pi )
{ w0(0);
if (pi->mode >= 2) { w2(9); w2(0); } else t2(2);
w2(0x4c); w0(pi->saved_r0);
}
static void bpck_force_spp ( PIA *pi )
/* This fakes the EPP protocol to turn off EPP ... */
{ pi->saved_r0 = r0();
w0(0xff-pi->unit); w2(4); w0(pi->unit);
t2(8); t2(8); t2(8);
t2(2); t2(2);
w2(0);
w0(4); w2(9); w2(0);
w0(0); w2(1); w2(3); w2(0);
w0(0); w2(9); w2(0);
w2(0x4c); w0(pi->saved_r0);
}
#define TEST_LEN 16
static int bpck_test_proto( PIA *pi, char * scratch, int verbose )
{ int i, e, l, h, om;
char buf[TEST_LEN];
bpck_force_spp(pi);
switch (pi->mode) {
case 0: bpck_connect(pi);
WR(0x13,0x7f);
w0(0x13); t2(2);
for(i=0;i<TEST_LEN;i++) {
t2(4); l = r1();
t2(4); h = r1();
buf[i] = j44(l,h);
}
bpck_disconnect(pi);
break;
case 1: bpck_connect(pi);
WR(0x13,0x7f);
w0(0x13); t2(2); t2(0x20);
for(i=0;i<TEST_LEN;i++) { t2(4); buf[i] = r0(); }
t2(1); t2(0x20);
bpck_disconnect(pi);
break;
case 2:
case 3:
case 4: om = pi->mode;
pi->mode = 0;
bpck_connect(pi);
WR(7,3);
WR(4,8);
bpck_disconnect(pi);
pi->mode = om;
bpck_connect(pi);
w0(0x13); w2(9); w2(1); w0(0); w2(3); w2(0); w2(0xe0);
switch (pi->mode) {
case 2: for (i=0;i<TEST_LEN;i++) buf[i] = r4();
break;
case 3: for (i=0;i<TEST_LEN/2;i++) ((u16 *)buf)[i] = r4w();
break;
case 4: for (i=0;i<TEST_LEN/4;i++) ((u32 *)buf)[i] = r4l();
break;
}
w2(0);
WR(7,0);
bpck_disconnect(pi);
break;
}
if (verbose) {
printk("%s: bpck: 0x%x unit %d mode %d: ",
pi->device,pi->port,pi->unit,pi->mode);
for (i=0;i<TEST_LEN;i++) printk("%3d",buf[i]);
printk("\n");
}
e = 0;
for (i=0;i<TEST_LEN;i++) if (buf[i] != (i+1)) e++;
return e;
}
static void bpck_read_eeprom ( PIA *pi, char * buf )
{ int i, j, k, p, v, f, om, od;
bpck_force_spp(pi);
om = pi->mode; od = pi->delay;
pi->mode = 0; pi->delay = 6;
bpck_connect(pi);
WR(4,0);
for (i=0;i<64;i++) {
WR(6,8);
WR(6,0xc);
p = 0x100;
for (k=0;k<9;k++) {
f = (((i + 0x180) & p) != 0) * 2;
WR(6,f+0xc);
WR(6,f+0xd);
WR(6,f+0xc);
p = (p >> 1);
}
for (j=0;j<2;j++) {
v = 0;
for (k=0;k<8;k++) {
WR(6,0xc);
WR(6,0xd);
WR(6,0xc);
f = RR(0);
v = 2*v + (f == 0x84);
}
buf[2*i+1-j] = v;
}
}
WR(6,8);
WR(6,0);
WR(5,8);
bpck_disconnect(pi);
if (om >= 2) {
bpck_connect(pi);
WR(7,3);
WR(4,8);
bpck_disconnect(pi);
}
pi->mode = om; pi->delay = od;
}
static int bpck_test_port ( PIA *pi ) /* check for 8-bit port */
{ int i, r, m;
w2(0x2c); i = r0(); w0(255-i); r = r0(); w0(i);
m = -1;
if (r == i) m = 2;
if (r == (255-i)) m = 0;
w2(0xc); i = r0(); w0(255-i); r = r0(); w0(i);
if (r != (255-i)) m = -1;
if (m == 0) { w2(6); w2(0xc); r = r0(); w0(0xaa); w0(r); w0(0xaa); }
if (m == 2) { w2(0x26); w2(0xc); }
if (m == -1) return 0;
return 5;
}
static void bpck_log_adapter( PIA *pi, char * scratch, int verbose )
{ char *mode_string[5] = { "4-bit","8-bit","EPP-8",
"EPP-16","EPP-32" };
#ifdef DUMP_EEPROM
int i;
#endif
bpck_read_eeprom(pi,scratch);
#ifdef DUMP_EEPROM
if (verbose) {
for(i=0;i<128;i++)
if ((scratch[i] < ' ') || (scratch[i] > '~'))
scratch[i] = '.';
printk("%s: bpck EEPROM: %64.64s\n",pi->device,scratch);
printk("%s: %64.64s\n",pi->device,&scratch[64]);
}
#endif
printk("%s: bpck %s, backpack %8.8s unit %d",
pi->device,BPCK_VERSION,&scratch[110],pi->unit);
printk(" at 0x%x, mode %d (%s), delay %d\n",pi->port,
pi->mode,mode_string[pi->mode],pi->delay);
}
static struct pi_protocol bpck = {
.owner = THIS_MODULE,
.name = "bpck",
.max_mode = 5,
.epp_first = 2,
.default_delay = 4,
.max_units = 255,
.write_regr = bpck_write_regr,
.read_regr = bpck_read_regr,
.write_block = bpck_write_block,
.read_block = bpck_read_block,
.connect = bpck_connect,
.disconnect = bpck_disconnect,
.test_port = bpck_test_port,
.probe_unit = bpck_probe_unit,
.test_proto = bpck_test_proto,
.log_adapter = bpck_log_adapter,
};
static int __init bpck_init(void)
{
return paride_register(&bpck);
}
static void __exit bpck_exit(void)
{
paride_unregister(&bpck);
}
MODULE_LICENSE("GPL");
module_init(bpck_init)
module_exit(bpck_exit)
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