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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * (c) 1998 Grant R. Guenther <grant@torque.net>4 *5 * ktti.c is a low-level protocol driver for the KT Technology6 * parallel port adapter. This adapter is used in the "PHd"7 * portable hard-drives. As far as I can tell, this device8 * supports 4-bit mode _only_.9*/10 11#include <linux/module.h>12#include <linux/init.h>13#include <linux/delay.h>14#include <linux/kernel.h>15#include <linux/types.h>16#include <linux/wait.h>17#include <asm/io.h>18#include "pata_parport.h"19 20#define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0))21 22/*23 * cont = 0 - access the IDE register file24 * cont = 1 - access the IDE command set25 */26static int cont_map[2] = { 0x10, 0x08 };27 28static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val)29{30 int r = regr + cont_map[cont];31 32 w0(r); w2(0xb); w2(0xa); w2(3); w2(6);33 w0(val); w2(3); w0(0); w2(6); w2(0xb);34}35 36static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr)37{38 int a, b, r;39 40 r = regr + cont_map[cont];41 42 w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);43 a = r1(); w2(0xc); b = r1(); w2(9); w2(0xc); w2(9);44 return j44(a, b);45}46 47static void ktti_read_block(struct pi_adapter *pi, char *buf, int count)48{49 int k, a, b;50 51 for (k = 0; k < count / 2; k++) {52 w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);53 a = r1(); w2(0xc); b = r1(); w2(9);54 buf[2*k] = j44(a, b);55 a = r1(); w2(0xc); b = r1(); w2(9);56 buf[2*k+1] = j44(a, b);57 }58}59 60static void ktti_write_block(struct pi_adapter *pi, char *buf, int count)61{62 int k;63 64 for (k = 0; k < count / 2; k++) {65 w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);66 w0(buf[2 * k]); w2(3);67 w0(buf[2 * k + 1]); w2(6);68 w2(0xb);69 }70}71 72static void ktti_connect(struct pi_adapter *pi)73{74 pi->saved_r0 = r0();75 pi->saved_r2 = r2();76 w2(0xb); w2(0xa); w0(0); w2(3); w2(6);77}78 79static void ktti_disconnect(struct pi_adapter *pi)80{81 w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);82 w0(pi->saved_r0);83 w2(pi->saved_r2);84}85 86static void ktti_log_adapter(struct pi_adapter *pi)87{88 dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n",89 pi->port, pi->delay);90}91 92static struct pi_protocol ktti = {93 .owner = THIS_MODULE,94 .name = "ktti",95 .max_mode = 1,96 .epp_first = 2,97 .default_delay = 1,98 .max_units = 1,99 .write_regr = ktti_write_regr,100 .read_regr = ktti_read_regr,101 .write_block = ktti_write_block,102 .read_block = ktti_read_block,103 .connect = ktti_connect,104 .disconnect = ktti_disconnect,105 .log_adapter = ktti_log_adapter,106};107 108MODULE_LICENSE("GPL");109MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");110MODULE_DESCRIPTION("KT Technology parallel port IDE adapter protocol driver");111module_pata_parport_driver(ktti);112