1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *	Low-level parallel-support for PC-style hardware integrated in the
4 *	LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
5 *
6 *	(C) 1999-2001 by Helge Deller <deller@gmx.de>
7 *
8 * based on parport_pc.c by
9 * 	    Grant Guenther <grant@torque.net>
10 * 	    Phil Blundell <Philip.Blundell@pobox.com>
11 *          Tim Waugh <tim@cyberelk.demon.co.uk>
12 *	    Jose Renau <renau@acm.org>
13 *          David Campbell
14 *          Andrea Arcangeli
15 */
16
17#ifndef	__DRIVERS_PARPORT_PARPORT_GSC_H
18#define	__DRIVERS_PARPORT_PARPORT_GSC_H
19
20#include <asm/io.h>
21#include <linux/delay.h>
22
23#undef	DEBUG_PARPORT	/* undefine for production */
24#define DELAY_TIME 	0
25
26#if DELAY_TIME == 0
27#define parport_readb	gsc_readb
28#define parport_writeb	gsc_writeb
29#else
30static __inline__ unsigned char parport_readb( unsigned long port )
31{
32    udelay(DELAY_TIME);
33    return gsc_readb(port);
34}
35
36static __inline__ void parport_writeb( unsigned char value, unsigned long port )
37{
38    gsc_writeb(value,port);
39    udelay(DELAY_TIME);
40}
41#endif
42
43/* --- register definitions ------------------------------- */
44
45#define EPPDATA(p)  ((p)->base    + 0x4)
46#define EPPADDR(p)  ((p)->base    + 0x3)
47#define CONTROL(p)  ((p)->base    + 0x2)
48#define STATUS(p)   ((p)->base    + 0x1)
49#define DATA(p)     ((p)->base    + 0x0)
50
51struct parport_gsc_private {
52	/* Contents of CTR. */
53	unsigned char ctr;
54
55	/* Bitmask of writable CTR bits. */
56	unsigned char ctr_writable;
57
58	/* Number of bytes per portword. */
59	int pword;
60
61	/* Not used yet. */
62	int readIntrThreshold;
63	int writeIntrThreshold;
64
65	/* buffer suitable for DMA, if DMA enabled */
66	struct pci_dev *dev;
67};
68
69static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
70{
71#ifdef DEBUG_PARPORT
72	printk(KERN_DEBUG "%s(%p,0x%02x)\n", __func__, p, d);
73#endif
74	parport_writeb(d, DATA(p));
75}
76
77static inline unsigned char parport_gsc_read_data(struct parport *p)
78{
79	unsigned char val = parport_readb (DATA (p));
80#ifdef DEBUG_PARPORT
81	printk(KERN_DEBUG "%s(%p) = 0x%02x\n", __func__, p, val);
82#endif
83	return val;
84}
85
86/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
87 * it doesn't do any extra masking. */
88static inline unsigned char __parport_gsc_frob_control(struct parport *p,
89							unsigned char mask,
90							unsigned char val)
91{
92	struct parport_gsc_private *priv = p->physport->private_data;
93	unsigned char ctr = priv->ctr;
94#ifdef DEBUG_PARPORT
95	printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n",
96	       __func__, mask, val,
97	       ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
98#endif
99	ctr = (ctr & ~mask) ^ val;
100	ctr &= priv->ctr_writable; /* only write writable bits. */
101	parport_writeb (ctr, CONTROL (p));
102	priv->ctr = ctr;	/* Update soft copy */
103	return ctr;
104}
105
106static inline void parport_gsc_data_reverse(struct parport *p)
107{
108	__parport_gsc_frob_control (p, 0x20, 0x20);
109}
110
111static inline void parport_gsc_data_forward(struct parport *p)
112{
113	__parport_gsc_frob_control (p, 0x20, 0x00);
114}
115
116static inline void parport_gsc_write_control(struct parport *p,
117						 unsigned char d)
118{
119	const unsigned char wm = (PARPORT_CONTROL_STROBE |
120				  PARPORT_CONTROL_AUTOFD |
121				  PARPORT_CONTROL_INIT |
122				  PARPORT_CONTROL_SELECT);
123
124	/* Take this out when drivers have adapted to newer interface. */
125	if (d & 0x20) {
126		printk(KERN_DEBUG "%s (%s): use data_reverse for this!\n",
127		       p->name, p->cad->name);
128		parport_gsc_data_reverse (p);
129	}
130
131	__parport_gsc_frob_control (p, wm, d & wm);
132}
133
134static inline unsigned char parport_gsc_read_control(struct parport *p)
135{
136	const unsigned char rm = (PARPORT_CONTROL_STROBE |
137				  PARPORT_CONTROL_AUTOFD |
138				  PARPORT_CONTROL_INIT |
139				  PARPORT_CONTROL_SELECT);
140	const struct parport_gsc_private *priv = p->physport->private_data;
141	return priv->ctr & rm; /* Use soft copy */
142}
143
144static inline unsigned char parport_gsc_frob_control(struct parport *p,
145							unsigned char mask,
146							unsigned char val)
147{
148	const unsigned char wm = (PARPORT_CONTROL_STROBE |
149				  PARPORT_CONTROL_AUTOFD |
150				  PARPORT_CONTROL_INIT |
151				  PARPORT_CONTROL_SELECT);
152
153	/* Take this out when drivers have adapted to newer interface. */
154	if (mask & 0x20) {
155		printk(KERN_DEBUG "%s (%s): use data_%s for this!\n",
156		       p->name, p->cad->name,
157		       (val & 0x20) ? "reverse" : "forward");
158		if (val & 0x20)
159			parport_gsc_data_reverse (p);
160		else
161			parport_gsc_data_forward (p);
162	}
163
164	/* Restrict mask and val to control lines. */
165	mask &= wm;
166	val &= wm;
167
168	return __parport_gsc_frob_control (p, mask, val);
169}
170
171static inline unsigned char parport_gsc_read_status(struct parport *p)
172{
173	return parport_readb (STATUS(p));
174}
175
176static inline void parport_gsc_disable_irq(struct parport *p)
177{
178	__parport_gsc_frob_control (p, 0x10, 0x00);
179}
180
181static inline void parport_gsc_enable_irq(struct parport *p)
182{
183	__parport_gsc_frob_control (p, 0x10, 0x10);
184}
185
186extern void parport_gsc_release_resources(struct parport *p);
187
188extern int parport_gsc_claim_resources(struct parport *p);
189
190extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
191
192extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
193
194extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
195
196extern void parport_gsc_inc_use_count(void);
197
198extern void parport_gsc_dec_use_count(void);
199
200#endif	/* __DRIVERS_PARPORT_PARPORT_GSC_H */
201