| /* |
| 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) |
