comm.c
资源名称:block.rar [点击查看]
上传用户:ajay2009
上传日期:2009-05-22
资源大小:495k
文件大小:5k
源码类别:
驱动编程
开发平台:
Unix_Linux
- /*
- 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); 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); 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); r1(); w2(0x24);
- for (i=0;i<count;i++) buf[i] = r4();
- w2(4);
- break;
- case 3: w3(0x68); r1(); w2(0x24);
- for (i=0;i<count/2;i++) ((u16 *)buf)[i] = r4w();
- w2(4);
- break;
- case 4: w3(0x68); 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); r1();
- for (k=0;k<count;k++) w4(buf[k^1]);
- break;
- case 3: w3(0x48); r1();
- for (k=0;k<count/2;k++) w4w(pi_swab16(buf,k));
- break;
- case 4: w3(0x48); 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 %dn",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 pi_register(&comm)-1;
- }
- static void __exit comm_exit(void)
- {
- pi_unregister(&comm);
- }
- MODULE_LICENSE("GPL");
- module_init(comm_init)
- module_exit(comm_exit)