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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * (c) 1998 Grant R. Guenther <grant@torque.net>4 *5 * fit2.c is a low-level protocol driver for the older version6 * of the Fidelity International Technology parallel port adapter.7 * This adapter is used in their TransDisk 2000 and older TransDisk8 * 3000 portable hard-drives. As far as I can tell, this device9 * supports 4-bit mode _only_.10 *11 * Newer models of the FIT products use an enhanced protocol.12 * The "fit3" protocol module should support current drives.13 */14 15#include <linux/module.h>16#include <linux/init.h>17#include <linux/delay.h>18#include <linux/kernel.h>19#include <linux/types.h>20#include <linux/wait.h>21#include <asm/io.h>22#include "pata_parport.h"23 24#define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0))25 26/*27 * cont = 0 - access the IDE register file28 * cont = 1 - access the IDE command set29 *30 * NB: The FIT adapter does not appear to use the control registers.31 * So, we map ALT_STATUS to STATUS and NO-OP writes to the device32 * control register - this means that IDE reset will not work on these33 * devices.34 */35 36static void fit2_write_regr(struct pi_adapter *pi, int cont, int regr, int val)37{38 if (cont == 1)39 return;40 w2(0xc); w0(regr); w2(4); w0(val); w2(5); w0(0); w2(4);41}42 43static int fit2_read_regr(struct pi_adapter *pi, int cont, int regr)44{45 int a, b, r;46 47 if (cont) {48 if (regr != 6)49 return 0xff;50 r = 7;51 } else {52 r = regr + 0x10;53 }54 55 w2(0xc); w0(r); w2(4); w2(5);56 w0(0); a = r1();57 w0(1); b = r1();58 w2(4);59 60 return j44(a, b);61}62 63static void fit2_read_block(struct pi_adapter *pi, char *buf, int count)64{65 int k, a, b, c, d;66 67 w2(0xc); w0(0x10);68 69 for (k = 0; k < count / 4; k++) {70 w2(4); w2(5);71 w0(0); a = r1(); w0(1); b = r1();72 w0(3); c = r1(); w0(2); d = r1();73 buf[4 * k + 0] = j44(a, b);74 buf[4 * k + 1] = j44(d, c);75 76 w2(4); w2(5);77 a = r1(); w0(3); b = r1();78 w0(1); c = r1(); w0(0); d = r1();79 buf[4 * k + 2] = j44(d, c);80 buf[4 * k + 3] = j44(a, b);81 }82 83 w2(4);84}85 86static void fit2_write_block(struct pi_adapter *pi, char *buf, int count)87{88 int k;89 90 w2(0xc); w0(0);91 for (k = 0; k < count / 2; k++) {92 w2(4); w0(buf[2 * k]);93 w2(5); w0(buf[2 * k + 1]);94 }95 w2(4);96}97 98static void fit2_connect(struct pi_adapter *pi)99{100 pi->saved_r0 = r0();101 pi->saved_r2 = r2();102 w2(0xcc);103}104 105static void fit2_disconnect(struct pi_adapter *pi)106{107 w0(pi->saved_r0);108 w2(pi->saved_r2);109}110 111static void fit2_log_adapter(struct pi_adapter *pi)112{113 dev_info(&pi->dev, "FIT 2000 adapter at 0x%x, delay %d\n",114 pi->port, pi->delay);115 116}117 118static struct pi_protocol fit2 = {119 .owner = THIS_MODULE,120 .name = "fit2",121 .max_mode = 1,122 .epp_first = 2,123 .default_delay = 1,124 .max_units = 1,125 .write_regr = fit2_write_regr,126 .read_regr = fit2_read_regr,127 .write_block = fit2_write_block,128 .read_block = fit2_read_block,129 .connect = fit2_connect,130 .disconnect = fit2_disconnect,131 .log_adapter = fit2_log_adapter,132};133 134MODULE_LICENSE("GPL");135MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");136MODULE_DESCRIPTION("Fidelity International Technology parallel port IDE adapter"137 "(older models) protocol driver");138module_pata_parport_driver(fit2);139