epat.c
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- /*
- epat.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- This is the low level protocol driver for the EPAT parallel
- to IDE adapter from Shuttle Technologies. This adapter is
- used in many popular parallel port disk products such as the
- SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
-
- */
- /* Changes:
- 1.01 GRG 1998.05.06 init_proto, release_proto
- 1.02 Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect
- */
- #define EPAT_VERSION "1.02"
- #include <linux/module.h>
- #include <linux/delay.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/wait.h>
- #include <asm/io.h>
- #include "paride.h"
- #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0))
- #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0))
- /* cont = 0 IDE register file
- cont = 1 IDE control registers
- cont = 2 internal EPAT registers
- */
- static int cont_map[3] = { 0x18, 0x10, 0 };
- static void epat_write_regr( PIA *pi, int cont, int regr, int val)
- { int r;
- r = regr + cont_map[cont];
- switch (pi->mode) {
- case 0:
- case 1:
- case 2: w0(0x60+r); w2(1); w0(val); w2(4);
- break;
- case 3:
- case 4:
- case 5: w3(0x40+r); w4(val);
- break;
- }
- }
- static int epat_read_regr( PIA *pi, int cont, int regr )
- { int a, b, r;
- r = regr + cont_map[cont];
- switch (pi->mode) {
- case 0: w0(r); w2(1); w2(3);
- a = r1(); w2(4); b = r1();
- return j44(a,b);
- case 1: w0(0x40+r); w2(1); w2(4);
- a = r1(); b = r2(); w0(0xff);
- return j53(a,b);
- case 2: w0(0x20+r); w2(1); w2(0x25);
- a = r0(); w2(4);
- return a;
- case 3:
- case 4:
- case 5: w3(r); w2(0x24); a = r4(); w2(4);
- return a;
- }
- return -1; /* never gets here */
- }
- static void epat_read_block( PIA *pi, char * buf, int count )
- { int k, ph, a, b;
- switch (pi->mode) {
- case 0: w0(7); w2(1); w2(3); w0(0xff);
- ph = 0;
- for(k=0;k<count;k++) {
- if (k == count-1) w0(0xfd);
- w2(6+ph); a = r1();
- if (a & 8) b = a;
- else { w2(4+ph); b = r1(); }
- buf[k] = j44(a,b);
- ph = 1 - ph;
- }
- w0(0); w2(4);
- break;
- case 1: w0(0x47); w2(1); w2(5); w0(0xff);
- ph = 0;
- for(k=0;k<count;k++) {
- if (k == count-1) w0(0xfd);
- w2(4+ph);
- a = r1(); b = r2();
- buf[k] = j53(a,b);
- ph = 1 - ph;
- }
- w0(0); w2(4);
- break;
- case 2: w0(0x27); w2(1); w2(0x25); w0(0);
- ph = 0;
- for(k=0;k<count-1;k++) {
- w2(0x24+ph);
- buf[k] = r0();
- ph = 1 - ph;
- }
- w2(0x26); w2(0x27); buf[count-1] = r0();
- w2(0x25); w2(4);
- break;
- case 3: w3(0x80); w2(0x24);
- for(k=0;k<count-1;k++) buf[k] = r4();
- w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
- w2(4);
- break;
- case 4: w3(0x80); w2(0x24);
- for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
- buf[count-2] = r4();
- w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
- w2(4);
- break;
- case 5: w3(0x80); w2(0x24);
- for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
- for(k=count-4;k<count-1;k++) buf[k] = r4();
- w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
- w2(4);
- break;
- }
- }
- static void epat_write_block( PIA *pi, char * buf, int count )
- { int ph, k;
- switch (pi->mode) {
- case 0:
- case 1:
- case 2: w0(0x67); w2(1); w2(5);
- ph = 0;
- for(k=0;k<count;k++) {
- w0(buf[k]);
- w2(4+ph);
- ph = 1 - ph;
- }
- w2(7); w2(4);
- break;
- case 3: w3(0xc0);
- for(k=0;k<count;k++) w4(buf[k]);
- w2(4);
- break;
- case 4: w3(0xc0);
- for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]);
- w2(4);
- break;
- case 5: w3(0xc0);
- for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]);
- w2(4);
- break;
- }
- }
- /* these macros access the EPAT registers in native addressing */
- #define WR(r,v) epat_write_regr(pi,2,r,v)
- #define RR(r) (epat_read_regr(pi,2,r))
- /* and these access the IDE task file */
- #define WRi(r,v) epat_write_regr(pi,0,r,v)
- #define RRi(r) (epat_read_regr(pi,0,r))
- /* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */
- #define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);
- w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
- static void epat_connect ( PIA *pi )
- { pi->saved_r0 = r0();
- pi->saved_r2 = r2();
- #ifdef CONFIG_PARIDE_EPATC8
- /* Initialize the chip */
- CPP(0);CPP(0x40);CPP(0xe0);
- w0(0);w2(1);w2(4);
- WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10);
- WR(0xe,0xf);WR(0xf,4);
- /* WR(0xe,0xa);WR(0xf,4); */
- WR(0xe,0xd);WR(0xf,0);
- /* CPP(0x30); */
- /* Connect to the chip */
- CPP(0xe0);
- w0(0);w2(1);w2(4); /* Idle into SPP */
- if (pi->mode >= 3) {
- w0(0);w2(1);w2(4);w2(0xc);
- /* Request EPP */
- w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4);
- }
- #else
- CPP(0); CPP(0xe0);
- w0(0); w2(1); w2(4);
- if (pi->mode >= 3) {
- w0(0); w2(1); w2(4); w2(0xc);
- w0(0x40); w2(6); w2(7); w2(4); w2(0xc); w2(4);
- }
- WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10);
- #endif
- }
- static void epat_disconnect (PIA *pi)
- { CPP(0x30);
- w0(pi->saved_r0);
- w2(pi->saved_r2);
- }
- static int epat_test_proto( PIA *pi, char * scratch, int verbose )
- { int k, j, f, cc;
- int e[2] = {0,0};
- epat_connect(pi);
- cc = RR(0xd);
- epat_disconnect(pi);
- epat_connect(pi);
- for (j=0;j<2;j++) {
- WRi(6,0xa0+j*0x10);
- for (k=0;k<256;k++) {
- WRi(2,k^0xaa);
- WRi(3,k^0x55);
- if (RRi(2) != (k^0xaa)) e[j]++;
- }
- }
- epat_disconnect(pi);
- f = 0;
- epat_connect(pi);
- WR(0x13,1); WR(0x13,0); WR(0xa,0x11);
- epat_read_block(pi,scratch,512);
-
- for (k=0;k<256;k++) {
- if ((scratch[2*k] & 0xff) != k) f++;
- if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++;
- }
- epat_disconnect(pi);
- if (verbose) {
- printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)n",
- pi->device,pi->port,pi->mode,cc,e[0],e[1],f);
- }
-
- return (e[0] && e[1]) || f;
- }
- static void epat_log_adapter( PIA *pi, char * scratch, int verbose )
- { int ver;
- char *mode_string[6] =
- {"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"};
- epat_connect(pi);
- WR(0xa,0x38); /* read the version code */
- ver = RR(0xb);
- epat_disconnect(pi);
- printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ",
- pi->device,EPAT_VERSION,ver,pi->port);
- printk("mode %d (%s), delay %dn",pi->mode,
- mode_string[pi->mode],pi->delay);
- }
- static void epat_init_proto( PIA *pi)
- { MOD_INC_USE_COUNT;
- }
- static void epat_release_proto( PIA *pi)
- { MOD_DEC_USE_COUNT;
- }
- struct pi_protocol epat = {"epat",0,6,3,1,1,
- epat_write_regr,
- epat_read_regr,
- epat_write_block,
- epat_read_block,
- epat_connect,
- epat_disconnect,
- 0,
- 0,
- epat_test_proto,
- epat_log_adapter,
- epat_init_proto,
- epat_release_proto
- };
- #ifdef MODULE
- int init_module(void)
- { return pi_register( &epat) - 1;
- }
- void cleanup_module(void)
- { pi_unregister( &epat);
- }
- #endif
- /* end of epat.c */
- MODULE_LICENSE("GPL");