| /* |
| comm.c (c) 1997-8 Grant R. Guenther <grant@torque.net> |
| Under the terms of the GNU General Public License. |
| |
| comm.c is a low-level protocol driver for some older models |
| of the DataStor "Commuter" parallel to IDE adapter. Some of |
| the parallel port devices marketed by Arista currently |
| use this adapter. |
| */ |
| |
| /* Changes: |
| |
| 1.01 GRG 1998.05.05 init_proto, release_proto |
| |
| */ |
| |
| #define COMM_VERSION "1.01" |
| |
| #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" |
| |
| /* mode codes: 0 nybble reads, 8-bit writes |
| 1 8-bit reads and writes |
| 2 8-bit EPP mode |
| */ |
| |
| #define j44(a,b) (((a>>3)&0x0f)|((b<<1)&0xf0)) |
| |
| #define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4); |
| #define P2 w2(5);w2(7);w2(7);w2(5);w2(4); |
| |
| /* cont = 0 - access the IDE register file |
| cont = 1 - access the IDE command set |
| */ |
| |
| static int cont_map[2] = { 0x08, 0x10 }; |
| |
| static int comm_read_regr( PIA *pi, int cont, int regr ) |
| |
| { int l, h, r; |
| |
| r = regr + cont_map[cont]; |
| |
| switch (pi->mode) { |
| |
| case 0: w0(r); P1; w0(0); |
| w2(6); l = r1(); w0(0x80); h = r1(); w2(4); |
| return j44(l,h); |
| |
| case 1: w0(r+0x20); P1; |
| w0(0); w2(0x26); h = r0(); w2(4); |
| return h; |
| |
| case 2: |
| case 3: |
| case 4: w3(r+0x20); (void)r1(); |
| w2(0x24); h = r4(); w2(4); |
| return h; |
| |
| } |
| return -1; |
| } |
| |
| static void comm_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); P1; w0(val); P2; |
| break; |
| |
| case 2: |
| case 3: |
| case 4: w3(r); (void)r1(); w4(val); |
| break; |
| } |
| } |
| |
| static void comm_connect ( PIA *pi ) |
| |
| { pi->saved_r0 = r0(); |
| pi->saved_r2 = r2(); |
| w2(4); w0(0xff); w2(6); |
| w2(4); w0(0xaa); w2(6); |
| w2(4); w0(0x00); w2(6); |
| w2(4); w0(0x87); w2(6); |
| w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4); |
| } |
| |
| static void comm_disconnect ( PIA *pi ) |
| |
| { w2(0); w2(0); w2(0); w2(4); |
| w0(pi->saved_r0); |
| w2(pi->saved_r2); |
| } |
| |
| static void comm_read_block( PIA *pi, char * buf, int count ) |
| |
| { int i, l, h; |
| |
| switch (pi->mode) { |
| |
| case 0: w0(0x48); P1; |
| for(i=0;i<count;i++) { |
| w0(0); w2(6); l = r1(); |
| w0(0x80); h = r1(); w2(4); |
| buf[i] = j44(l,h); |
| } |
| break; |
| |
| case 1: w0(0x68); P1; w0(0); |
| for(i=0;i<count;i++) { |
| w2(0x26); buf[i] = r0(); w2(0x24); |
| } |
| w2(4); |
| break; |
| |
| case 2: w3(0x68); (void)r1(); w2(0x24); |
| for (i=0;i<count;i++) buf[i] = r4(); |
| w2(4); |
| break; |
| |
| case 3: w3(0x68); (void)r1(); w2(0x24); |
| for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w(); |
| w2(4); |
| break; |
| |
| case 4: w3(0x68); (void)r1(); w2(0x24); |
| for (i=0;i<count/4;i++) ((u32 *)buf)[i] = r4l(); |
| w2(4); |
| break; |
| |
| } |
| } |
| |
| /* NB: Watch out for the byte swapped writes ! */ |
| |
| static void comm_write_block( PIA *pi, char * buf, int count ) |
| |
| { int k; |
| |
| switch (pi->mode) { |
| |
| case 0: |
| case 1: w0(0x68); P1; |
| for (k=0;k<count;k++) { |
| w2(5); w0(buf[k^1]); w2(7); |
| } |
| w2(5); w2(4); |
| break; |
| |
| case 2: w3(0x48); (void)r1(); |
| for (k=0;k<count;k++) w4(buf[k^1]); |
| break; |
| |
| case 3: w3(0x48); (void)r1(); |
| for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k)); |
| break; |
| |
| case 4: w3(0x48); (void)r1(); |
| for (k=0;k<count/4;k++) w4l(pi_swab32(buf,k)); |
| break; |
| |
| |
| } |
| } |
| |
| static void comm_log_adapter( PIA *pi, char * scratch, int verbose ) |
| |
| { char *mode_string[5] = {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"}; |
| |
| printk("%s: comm %s, DataStor Commuter at 0x%x, ", |
| pi->device,COMM_VERSION,pi->port); |
| printk("mode %d (%s), delay %d\n",pi->mode, |
| mode_string[pi->mode],pi->delay); |
| |
| } |
| |
| static struct pi_protocol comm = { |
| .owner = THIS_MODULE, |
| .name = "comm", |
| .max_mode = 5, |
| .epp_first = 2, |
| .default_delay = 1, |
| .max_units = 1, |
| .write_regr = comm_write_regr, |
| .read_regr = comm_read_regr, |
| .write_block = comm_write_block, |
| .read_block = comm_read_block, |
| .connect = comm_connect, |
| .disconnect = comm_disconnect, |
| .log_adapter = comm_log_adapter, |
| }; |
| |
| static int __init comm_init(void) |
| { |
| return paride_register(&comm); |
| } |
| |
| static void __exit comm_exit(void) |
| { |
| paride_unregister(&comm); |
| } |
| |
| MODULE_LICENSE("GPL"); |
| module_init(comm_init) |
| module_exit(comm_exit) |