363 lines
6.8 KiB
C
363 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
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*
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* This is the low level protocol driver for the EPAT parallel
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* to IDE adapter from Shuttle Technologies. This adapter is
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* used in many popular parallel port disk products such as the
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* SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include <asm/io.h>
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#include "pata_parport.h"
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#define j44(a, b) (((a >> 4) & 0x0f) + (b & 0xf0))
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#define j53(a, b) (((a >> 3) & 0x1f) + ((b << 4) & 0xe0))
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static int epatc8;
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module_param(epatc8, int, 0);
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MODULE_PARM_DESC(epatc8,
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"support for the Shuttle EP1284 chip, "
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"used in any recent Imation SuperDisk (LS-120) drive.");
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/*
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* cont = 0 IDE register file
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* cont = 1 IDE control registers
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* cont = 2 internal EPAT registers
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*/
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static int cont_map[3] = { 0x18, 0x10, 0 };
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static void epat_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
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{
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int r = regr + cont_map[cont];
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switch (pi->mode) {
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case 0:
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case 1:
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case 2:
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w0(0x60+r); w2(1); w0(val); w2(4);
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break;
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case 3:
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case 4:
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case 5:
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w3(0x40+r); w4(val);
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break;
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}
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}
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static int epat_read_regr(struct pi_adapter *pi, int cont, int regr)
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{
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int a, b, r;
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r = regr + cont_map[cont];
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switch (pi->mode) {
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case 0:
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w0(r); w2(1); w2(3);
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a = r1(); w2(4); b = r1();
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return j44(a, b);
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case 1:
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w0(0x40+r); w2(1); w2(4);
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a = r1(); b = r2(); w0(0xff);
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return j53(a, b);
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case 2:
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w0(0x20+r); w2(1); w2(0x25);
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a = r0(); w2(4);
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return a;
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case 3:
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case 4:
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case 5:
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w3(r); w2(0x24); a = r4(); w2(4);
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return a;
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}
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return -1; /* never gets here */
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}
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static void epat_read_block(struct pi_adapter *pi, char *buf, int count)
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{
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int k, ph, a, b;
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switch (pi->mode) {
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case 0:
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w0(7); w2(1); w2(3); w0(0xff);
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ph = 0;
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for (k = 0; k < count; k++) {
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if (k == count-1)
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w0(0xfd);
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w2(6 + ph); a = r1();
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if (a & 8) {
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b = a;
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} else {
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w2(4+ph); b = r1();
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}
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buf[k] = j44(a, b);
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ph = 1 - ph;
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}
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w0(0); w2(4);
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break;
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case 1:
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w0(0x47); w2(1); w2(5); w0(0xff);
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ph = 0;
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for (k = 0; k < count; k++) {
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if (k == count - 1)
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w0(0xfd);
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w2(4 + ph);
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a = r1(); b = r2();
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buf[k] = j53(a, b);
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ph = 1 - ph;
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}
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w0(0); w2(4);
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break;
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case 2:
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w0(0x27); w2(1); w2(0x25); w0(0);
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ph = 0;
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for (k = 0; k < count - 1; k++) {
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w2(0x24 + ph);
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buf[k] = r0();
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ph = 1 - ph;
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}
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w2(0x26); w2(0x27);
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buf[count - 1] = r0();
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w2(0x25); w2(4);
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break;
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case 3:
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w3(0x80); w2(0x24);
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for (k = 0; k < count - 1; k++)
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buf[k] = r4();
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w2(4); w3(0xa0); w2(0x24);
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buf[count - 1] = r4();
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w2(4);
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break;
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case 4:
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w3(0x80); w2(0x24);
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for (k = 0; k < count / 2 - 1; k++)
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((u16 *)buf)[k] = r4w();
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buf[count - 2] = r4();
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w2(4); w3(0xa0); w2(0x24);
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buf[count - 1] = r4();
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w2(4);
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break;
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case 5:
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w3(0x80); w2(0x24);
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for (k = 0; k < count / 4 - 1; k++)
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((u32 *)buf)[k] = r4l();
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for (k = count - 4; k < count - 1; k++)
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buf[k] = r4();
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w2(4); w3(0xa0); w2(0x24);
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buf[count - 1] = r4();
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w2(4);
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break;
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}
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}
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static void epat_write_block(struct pi_adapter *pi, char *buf, int count)
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{
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int ph, k;
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switch (pi->mode) {
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case 0:
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case 1:
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case 2:
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w0(0x67); w2(1); w2(5);
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ph = 0;
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for (k = 0; k < count; k++) {
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w0(buf[k]);
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w2(4 + ph);
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ph = 1 - ph;
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}
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w2(7); w2(4);
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break;
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case 3:
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w3(0xc0);
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for (k = 0; k < count; k++)
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w4(buf[k]);
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w2(4);
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break;
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case 4:
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w3(0xc0);
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for (k = 0; k < count / 2; k++)
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w4w(((u16 *)buf)[k]);
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w2(4);
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break;
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case 5:
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w3(0xc0);
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for (k = 0; k < count / 4; k++)
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w4l(((u32 *)buf)[k]);
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w2(4);
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break;
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}
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}
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/* these macros access the EPAT registers in native addressing */
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#define WR(r, v) epat_write_regr(pi, 2, r, v)
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#define RR(r) epat_read_regr(pi, 2, r)
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/* and these access the IDE task file */
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#define WRi(r, v) epat_write_regr(pi, 0, r, v)
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#define RRi(r) epat_read_regr(pi, 0, r)
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/* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */
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#define CPP(x) \
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do { \
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w2(4); w0(0x22); w0(0xaa); \
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w0(0x55); w0(0); w0(0xff); \
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w0(0x87); w0(0x78); w0(x); \
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w2(4); w2(5); w2(4); w0(0xff); \
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} while (0)
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static void epat_connect(struct pi_adapter *pi)
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{
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pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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/* Initialize the chip */
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CPP(0);
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if (epatc8) {
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CPP(0x40); CPP(0xe0);
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w0(0); w2(1); w2(4);
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WR(0x8, 0x12);
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WR(0xc, 0x14);
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WR(0x12, 0x10);
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WR(0xe, 0xf);
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WR(0xf, 4);
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/* WR(0xe,0xa);WR(0xf,4); */
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WR(0xe, 0xd);
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WR(0xf, 0);
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/* CPP(0x30); */
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}
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/* Connect to the chip */
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CPP(0xe0);
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w0(0); w2(1); w2(4); /* Idle into SPP */
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if (pi->mode >= 3) {
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w0(0); w2(1); w2(4); w2(0xc);
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/* Request EPP */
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w0(0x40); w2(6); w2(7); w2(4); w2(0xc); w2(4);
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}
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if (!epatc8) {
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WR(8, 0x10);
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WR(0xc, 0x14);
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WR(0xa, 0x38);
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WR(0x12, 0x10);
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}
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}
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static void epat_disconnect(struct pi_adapter *pi)
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{
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CPP(0x30);
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w0(pi->saved_r0);
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w2(pi->saved_r2);
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}
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static int epat_test_proto(struct pi_adapter *pi)
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{
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int k, j, f, cc;
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int e[2] = { 0, 0 };
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char scratch[512];
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epat_connect(pi);
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cc = RR(0xd);
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epat_disconnect(pi);
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epat_connect(pi);
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for (j=0;j<2;j++) {
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WRi(6, 0xa0 + j * 0x10);
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for (k = 0; k < 256; k++) {
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WRi(2, k ^ 0xaa);
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WRi(3, k ^ 0x55);
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if (RRi(2) != (k ^ 0xaa))
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e[j]++;
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}
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}
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epat_disconnect(pi);
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f = 0;
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epat_connect(pi);
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WR(0x13, 1); WR(0x13, 0); WR(0xa, 0x11);
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epat_read_block(pi, scratch, 512);
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for (k = 0; k < 256; k++) {
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if ((scratch[2 * k] & 0xff) != k)
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f++;
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if ((scratch[2 * k + 1] & 0xff) != 0xff - k)
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f++;
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}
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epat_disconnect(pi);
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dev_dbg(&pi->dev,
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"epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
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pi->port, pi->mode, cc, e[0], e[1], f);
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return (e[0] && e[1]) || f;
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}
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static void epat_log_adapter(struct pi_adapter *pi)
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{
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int ver;
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char *mode_string[6] =
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{ "4-bit", "5/3", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
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epat_connect(pi);
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WR(0xa, 0x38); /* read the version code */
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ver = RR(0xb);
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epat_disconnect(pi);
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dev_info(&pi->dev,
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"Shuttle EPAT chip %x at 0x%x, mode %d (%s), delay %d\n",
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ver, pi->port, pi->mode, mode_string[pi->mode], pi->delay);
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}
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static struct pi_protocol epat = {
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.owner = THIS_MODULE,
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.name = "epat",
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.max_mode = 6,
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.epp_first = 3,
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.default_delay = 1,
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.max_units = 1,
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.write_regr = epat_write_regr,
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.read_regr = epat_read_regr,
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.write_block = epat_write_block,
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.read_block = epat_read_block,
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.connect = epat_connect,
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.disconnect = epat_disconnect,
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.test_proto = epat_test_proto,
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.log_adapter = epat_log_adapter,
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};
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static int __init epat_init(void)
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{
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#ifdef CONFIG_PATA_PARPORT_EPATC8
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epatc8 = 1;
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#endif
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return pata_parport_register_driver(&epat);
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}
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static void __exit epat_exit(void)
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{
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pata_parport_unregister_driver(&epat);
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}
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MODULE_LICENSE("GPL");
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module_init(epat_init)
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module_exit(epat_exit)
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