| /* | |
| 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/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" | |
| #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0)) | |
| #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0)) | |
| static int epatc8; | |
| module_param(epatc8, int, 0); | |
| MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, " | |
| "used in any recent Imation SuperDisk (LS-120) drive."); | |
| /* 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(); | |
| /* Initialize the chip */ | |
| CPP(0); | |
| if (epatc8) { | |
| 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); | |
| } | |
| if (!epatc8) { | |
| WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10); | |
| } | |
| } | |
| 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 %d\n",pi->mode, | |
| mode_string[pi->mode],pi->delay); | |
| } | |
| static struct pi_protocol epat = { | |
| .owner = THIS_MODULE, | |
| .name = "epat", | |
| .max_mode = 6, | |
| .epp_first = 3, | |
| .default_delay = 1, | |
| .max_units = 1, | |
| .write_regr = epat_write_regr, | |
| .read_regr = epat_read_regr, | |
| .write_block = epat_write_block, | |
| .read_block = epat_read_block, | |
| .connect = epat_connect, | |
| .disconnect = epat_disconnect, | |
| .test_proto = epat_test_proto, | |
| .log_adapter = epat_log_adapter, | |
| }; | |
| static int __init epat_init(void) | |
| { | |
| #ifdef CONFIG_PARIDE_EPATC8 | |
| epatc8 = 1; | |
| #endif | |
| return paride_register(&epat); | |
| } | |
| static void __exit epat_exit(void) | |
| { | |
| paride_unregister(&epat); | |
| } | |
| MODULE_LICENSE("GPL"); | |
| module_init(epat_init) | |
| module_exit(epat_exit) |