[thirdparty/kernel/stable.git] / drivers / ata / pata_parport / comm.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * (c) 1997-1998  Grant R. Guenther <grant@torque.net>
 *
 * 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.
 */

#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 "pata_parport.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(struct pi_adapter *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); (void)r1();
		w2(0x24); h = r4(); w2(4);
		return h;
	}

	return -1;
}

static void comm_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
{
	int 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); (void)r1(); w4(val);
		break;
	}
}

static void comm_connect(struct pi_adapter *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(struct pi_adapter *pi)

{
	w2(0); w2(0); w2(0); w2(4);
	w0(pi->saved_r0);
	w2(pi->saved_r2);
}

static void comm_read_block(struct pi_adapter *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); (void)r1(); w2(0x24);
		for (i = 0; i < count; i++)
			buf[i] = r4();
		w2(4);
		break;
	case 3:
		w3(0x68); (void)r1(); w2(0x24);
		for (i = 0; i < count / 2; i++)
			((u16 *)buf)[i] = r4w();
		w2(4);
		break;
	case 4:
		w3(0x68); (void)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(struct pi_adapter *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); (void)r1();
		for (k = 0; k < count; k++)
			w4(buf[k ^ 1]);
		break;
	case 3:
		w3(0x48); (void)r1();
		for (k = 0; k < count / 2; k++)
			w4w(swab16(((u16 *)buf)[k]));
		break;
	case 4:
		w3(0x48); (void)r1();
		for (k = 0; k < count / 4; k++)
			w4l(swab16(((u16 *)buf)[2 * k]) |
			    swab16(((u16 *)buf)[2 * k + 1]) << 16);
		break;
        }
}

static void comm_log_adapter(struct pi_adapter *pi)

{       char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };

	dev_info(&pi->dev,
		 "DataStor Commuter at 0x%x, mode %d (%s), delay %d\n",
		 pi->port, 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,
};

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
MODULE_DESCRIPTION("DataStor Commuter parallel port IDE adapter protocol driver");
module_pata_parport_driver(comm);
Commit	Line	Data
630b64bc DLM	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* (c) 1997-1998 Grant R. Guenther <grant@torque.net>
	4	*
	5	* comm.c is a low-level protocol driver for some older models of the DataStor
	6	* "Commuter" parallel to IDE adapter. Some of the parallel port devices
	7	* marketed by Arista currently use this adapter.
	8	*/
1da177e4	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/delay.h>
	13	#include <linux/kernel.h>
	14	#include <linux/types.h>
	15	#include <linux/wait.h>
	16	#include <asm/io.h>
fe027ff9	17	#include "pata_parport.h"
1da177e4	18
630b64bc DLM	19	/*
	20	* mode codes: 0 nybble reads, 8-bit writes
	21	* 1 8-bit reads and writes
	22	* 2 8-bit EPP mode
	23	*/
1da177e4	24
630b64bc	25	#define j44(a, b) (((a >> 3) & 0x0f) \| ((b << 1) & 0xf0))
1da177e4 LT	26
	27	#define P1 w2(5);w2(0xd);w2(0xd);w2(5);w2(4);
	28	#define P2 w2(5);w2(7);w2(7);w2(5);w2(4);
	29
630b64bc DLM	30	/*
	31	* cont = 0 - access the IDE register file
	32	* cont = 1 - access the IDE command set
	33	*/
1da177e4 LT	34	static int cont_map[2] = { 0x08, 0x10 };
1da177e4 LT	35
882ff0ca	36	static int comm_read_regr(struct pi_adapter *pi, int cont, int regr)
630b64bc DLM	37	{
630b64bc DLM	38	int l, h, r;
1da177e4 LT	39
	40	r = regr + cont_map[cont];
	41
630b64bc DLM	42	switch (pi->mode) {
	43	case 0:
	44	w0(r); P1; w0(0);
	45	w2(6); l = r1(); w0(0x80); h = r1(); w2(4);
	46	return j44(l, h);
1da177e4	47
630b64bc DLM	48	case 1:
	49	w0(r+0x20); P1;
	50	w0(0); w2(0x26); h = r0(); w2(4);
	51	return h;
1da177e4 LT	52
	53	case 2:
	54	case 3:
630b64bc DLM	55	case 4:
	56	w3(r+0x20); (void)r1();
	57	w2(0x24); h = r4(); w2(4);
	58	return h;
	59	}
1da177e4	60
630b64bc DLM	61	return -1;
630b64bc DLM	62	}
1da177e4	63
882ff0ca	64	static void comm_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
630b64bc DLM	65	{
630b64bc DLM	66	int r = regr + cont_map[cont];
1da177e4	67
630b64bc DLM	68	switch (pi->mode) {
	69	case 0:
	70	case 1:
	71	w0(r); P1; w0(val); P2;
1da177e4	72	break;
1da177e4 LT	73	case 2:
1da177e4 LT	74	case 3:
630b64bc DLM	75	case 4:
	76	w3(r); (void)r1(); w4(val);
	77	break;
	78	}
1da177e4 LT	79	}
1da177e4 LT	80
882ff0ca	81	static void comm_connect(struct pi_adapter *pi)
630b64bc DLM	82	{
	83	pi->saved_r0 = r0();
	84	pi->saved_r2 = r2();
	85	w2(4); w0(0xff); w2(6);
	86	w2(4); w0(0xaa); w2(6);
	87	w2(4); w0(0x00); w2(6);
	88	w2(4); w0(0x87); w2(6);
	89	w2(4); w0(0xe0); w2(0xc); w2(0xc); w2(4);
1da177e4 LT	90	}
1da177e4 LT	91
882ff0ca	92	static void comm_disconnect(struct pi_adapter *pi)
1da177e4	93
630b64bc DLM	94	{
630b64bc DLM	95	w2(0); w2(0); w2(0); w2(4);
1da177e4	96	w0(pi->saved_r0);
630b64bc DLM	97	w2(pi->saved_r2);
630b64bc DLM	98	}
1da177e4	99
882ff0ca	100	static void comm_read_block(struct pi_adapter pi, char buf, int count)
630b64bc DLM	101	{
	102	int i, l, h;
	103
	104	switch (pi->mode) {
	105	case 0:
	106	w0(0x48); P1;
	107	for (i = 0; i < count; i++) {
	108	w0(0); w2(6); l = r1();
	109	w0(0x80); h = r1(); w2(4);
	110	buf[i] = j44(l, h);
	111	}
	112	break;
	113	case 1:
	114	w0(0x68); P1; w0(0);
	115	for (i = 0; i < count; i++) {
	116	w2(0x26);
	117	buf[i] = r0();
	118	w2(0x24);
	119	}
1da177e4 LT	120	w2(4);
1da177e4 LT	121	break;
630b64bc DLM	122	case 2:
	123	w3(0x68); (void)r1(); w2(0x24);
	124	for (i = 0; i < count; i++)
	125	buf[i] = r4();
	126	w2(4);
	127	break;
	128	case 3:
	129	w3(0x68); (void)r1(); w2(0x24);
	130	for (i = 0; i < count / 2; i++)
	131	((u16 *)buf)[i] = r4w();
	132	w2(4);
	133	break;
	134	case 4:
	135	w3(0x68); (void)r1(); w2(0x24);
	136	for (i = 0; i < count / 4; i++)
	137	((u32 *)buf)[i] = r4l();
1da177e4 LT	138	w2(4);
1da177e4 LT	139	break;
1da177e4 LT	140	}
	141	}
	142
	143	/* NB: Watch out for the byte swapped writes ! */
882ff0ca	144	static void comm_write_block(struct pi_adapter pi, char buf, int count)
630b64bc DLM	145	{
	146	int k;
	147
	148	switch (pi->mode) {
	149	case 0:
	150	case 1:
	151	w0(0x68); P1;
	152	for (k = 0; k < count; k++) {
	153	w2(5);
	154	w0(buf[k ^ 1]);
	155	w2(7);
	156	}
	157	w2(5); w2(4);
	158	break;
	159	case 2:
	160	w3(0x48); (void)r1();
	161	for (k = 0; k < count; k++)
	162	w4(buf[k ^ 1]);
	163	break;
	164	case 3:
	165	w3(0x48); (void)r1();
e02c625d OZ	166	for (k = 0; k < count / 2; k++)
e02c625d OZ	167	w4w(swab16(((u16 *)buf)[k]));
630b64bc DLM	168	break;
	169	case 4:
	170	w3(0x48); (void)r1();
e02c625d OZ	171	for (k = 0; k < count / 4; k++)
	172	w4l(swab16(((u16 )buf)[2 k]) \|
	173	swab16(((u16 )buf)[2 k + 1]) << 16);
630b64bc	174	break;
1da177e4 LT	175	}
	176	}
	177
5b77db9c	178	static void comm_log_adapter(struct pi_adapter *pi)
1da177e4	179
630b64bc	180	{ char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
1da177e4	181
630b64bc DLM	182	dev_info(&pi->dev,
	183	"DataStor Commuter at 0x%x, mode %d (%s), delay %d\n",
	184	pi->port, pi->mode, mode_string[pi->mode], pi->delay);
1da177e4 LT	185	}
	186
	187	static struct pi_protocol comm = {
	188	.owner = THIS_MODULE,
	189	.name = "comm",
	190	.max_mode = 5,
	191	.epp_first = 2,
	192	.default_delay = 1,
	193	.max_units = 1,
	194	.write_regr = comm_write_regr,
	195	.read_regr = comm_read_regr,
	196	.write_block = comm_write_block,
	197	.read_block = comm_read_block,
	198	.connect = comm_connect,
	199	.disconnect = comm_disconnect,
	200	.log_adapter = comm_log_adapter,
	201	};
	202
1da177e4	203	MODULE_LICENSE("GPL");
cec148c2 DLM	204	MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
cec148c2 DLM	205	MODULE_DESCRIPTION("DataStor Commuter parallel port IDE adapter protocol driver");
2c08ec0f	206	module_pata_parport_driver(comm);