299 lines
6.2 KiB
C
299 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* (c) 1996-1998 Grant R. Guenther <grant@torque.net>
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*
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* frpw.c is a low-level protocol driver for the Freecom "Power" parallel port
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* IDE adapter.
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*
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* Some applications of this adapter may require a "printer" reset prior to
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* loading the driver. This can be done by loading and unloading the "lp"
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* driver, or it can be done by this driver if you define FRPW_HARD_RESET.
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* The latter is not recommended as it may upset devices on other ports.
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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 cec4 w2(0xc);w2(0xe);w2(0xe);w2(0xc);w2(4);w2(4);w2(4);
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#define j44(l,h) (((l>>4)&0x0f)|(h&0xf0))
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/*
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* cont = 0 - access the IDE register file
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* cont = 1 - access the IDE command set
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*/
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static int cont_map[2] = { 0x08, 0x10 };
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static int frpw_read_regr(struct pi_adapter *pi, int cont, int regr)
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{
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int h, l, r;
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r = regr + cont_map[cont];
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w2(4);
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w0(r); cec4;
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w2(6); l = r1();
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w2(4); h = r1();
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w2(4);
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return j44(l, h);
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}
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static void frpw_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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w2(4); w0(r); cec4;
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w0(val);
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w2(5); w2(7); w2(5); w2(4);
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}
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static void frpw_read_block_int(struct pi_adapter *pi, char *buf, int count,
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int regr)
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{
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int h, l, k, ph;
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switch (pi->mode) {
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case 0:
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w2(4); w0(regr); cec4;
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for (k = 0; k < count; k++) {
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w2(6); l = r1();
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w2(4); h = r1();
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buf[k] = j44(l, h);
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}
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w2(4);
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break;
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case 1:
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ph = 2;
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w2(4); w0(regr + 0xc0); cec4;
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w0(0xff);
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for (k = 0; k < count; k++) {
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w2(0xa4 + ph);
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buf[k] = r0();
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ph = 2 - ph;
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}
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w2(0xac); w2(0xa4); w2(4);
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break;
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case 2:
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w2(4); w0(regr + 0x80); cec4;
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for (k = 0; k < count; k++)
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buf[k] = r4();
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w2(0xac); w2(0xa4);
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w2(4);
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break;
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case 3:
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w2(4); w0(regr + 0x80); cec4;
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for (k = 0; k < count - 2; k++)
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buf[k] = r4();
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w2(0xac); w2(0xa4);
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buf[count - 2] = r4();
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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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w2(4); w0(regr + 0x80); cec4;
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for (k = 0; k < count / 2 - 1; k++)
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((u16 *)buf)[k] = r4w();
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w2(0xac); w2(0xa4);
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buf[count - 2] = r4();
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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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w2(4); w0(regr + 0x80); cec4;
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for (k = 0; k < count / 4 - 1; k++)
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((u32 *)buf)[k] = r4l();
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buf[count - 4] = r4();
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buf[count - 3] = r4();
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w2(0xac); w2(0xa4);
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buf[count - 2] = r4();
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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 frpw_read_block(struct pi_adapter *pi, char *buf, int count)
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{
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frpw_read_block_int(pi, buf, count, 0x08);
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}
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static void frpw_write_block(struct pi_adapter *pi, char *buf, int count)
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{
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int 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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w2(4); w0(8); cec4; w2(5);
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for (k = 0; k < count; k++) {
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w0(buf[k]);
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w2(7); w2(5);
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}
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w2(4);
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break;
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case 3:
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w2(4); w0(0xc8); cec4; w2(5);
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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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w2(4); w0(0xc8); cec4; w2(5);
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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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w2(4); w0(0xc8); cec4; w2(5);
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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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static void frpw_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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w2(4);
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}
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static void frpw_disconnect(struct pi_adapter *pi)
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{
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w2(4); w0(0x20); cec4;
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w0(pi->saved_r0);
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w2(pi->saved_r2);
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}
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/*
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* Stub logic to see if PNP string is available - used to distinguish
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* between the Xilinx and ASIC implementations of the Freecom adapter.
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* returns chip_type: 0 = Xilinx, 1 = ASIC
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*/
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static int frpw_test_pnp(struct pi_adapter *pi)
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{
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int olddelay, a, b;
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#ifdef FRPW_HARD_RESET
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w0(0); w2(8); udelay(50); w2(0xc); /* parallel bus reset */
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mdelay(1500);
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#endif
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olddelay = pi->delay;
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pi->delay = 10;
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pi->saved_r0 = r0();
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pi->saved_r2 = r2();
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w2(4); w0(4); w2(6); w2(7);
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a = r1() & 0xff; w2(4); b = r1() & 0xff;
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w2(0xc); w2(0xe); w2(4);
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pi->delay = olddelay;
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w0(pi->saved_r0);
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w2(pi->saved_r2);
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return ((~a & 0x40) && (b & 0x40));
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}
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/*
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* We use the pi->private to remember the result of the PNP test.
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* To make this work, private = port*2 + chip. Yes, I know it's a hack :-(
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*/
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static int frpw_test_proto(struct pi_adapter *pi)
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{
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int j, k, r;
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int e[2] = { 0, 0 };
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char scratch[512];
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if ((pi->private >> 1) != pi->port)
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pi->private = frpw_test_pnp(pi) + 2*pi->port;
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if (((pi->private & 0x1) == 0) && (pi->mode > 2)) {
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dev_dbg(&pi->dev,
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"frpw: Xilinx does not support mode %d\n", pi->mode);
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return 1;
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}
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if (((pi->private & 0x1) == 1) && (pi->mode == 2)) {
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dev_dbg(&pi->dev, "frpw: ASIC does not support mode 2\n");
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return 1;
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}
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frpw_connect(pi);
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for (j = 0; j < 2; j++) {
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frpw_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
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for (k = 0; k < 256; k++) {
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frpw_write_regr(pi, 0, 2, k ^ 0xaa);
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frpw_write_regr(pi, 0, 3, k ^ 0x55);
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if (frpw_read_regr(pi, 0, 2) != (k ^ 0xaa))
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e[j]++;
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}
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}
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frpw_disconnect(pi);
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frpw_connect(pi);
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frpw_read_block_int(pi, scratch, 512, 0x10);
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r = 0;
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for (k = 0; k < 128; k++) {
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if (scratch[k] != k)
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r++;
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}
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frpw_disconnect(pi);
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dev_dbg(&pi->dev,
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"frpw: port 0x%x, chip %ld, mode %d, test=(%d,%d,%d)\n",
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pi->port, (pi->private%2), pi->mode, e[0], e[1], r);
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return r || (e[0] && e[1]);
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}
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static void frpw_log_adapter(struct pi_adapter *pi)
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{
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char *mode[6] = { "4-bit", "8-bit", "EPP", "EPP-8", "EPP-16", "EPP-32"};
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dev_info(&pi->dev,
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"Freecom (%s) adapter at 0x%x, mode %d (%s), delay %d\n",
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((pi->private & 0x1) == 0) ? "Xilinx" : "ASIC",
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pi->port, pi->mode, mode[pi->mode], pi->delay);
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}
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static struct pi_protocol frpw = {
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.owner = THIS_MODULE,
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.name = "frpw",
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.max_mode = 6,
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.epp_first = 2,
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.default_delay = 2,
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.max_units = 1,
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.write_regr = frpw_write_regr,
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.read_regr = frpw_read_regr,
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.write_block = frpw_write_block,
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.read_block = frpw_read_block,
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.connect = frpw_connect,
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.disconnect = frpw_disconnect,
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.test_proto = frpw_test_proto,
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.log_adapter = frpw_log_adapter,
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};
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
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MODULE_DESCRIPTION("Freecom Power parallel port IDE adapter protocol driver");
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module_pata_parport_driver(frpw);
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