summaryrefslogtreecommitdiffstats
path: root/include/linux/parport_pc.h
blob: 3d6fc576d6a112031af511e955aded9659a2a73d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_PARPORT_PC_H
#define __LINUX_PARPORT_PC_H

#include <asm/io.h>

/* --- register definitions ------------------------------- */

#define ECONTROL(p) ((p)->base_hi + 0x2)
#define CONFIGB(p)  ((p)->base_hi + 0x1)
#define CONFIGA(p)  ((p)->base_hi + 0x0)
#define FIFO(p)     ((p)->base_hi + 0x0)
#define EPPDATA(p)  ((p)->base    + 0x4)
#define EPPADDR(p)  ((p)->base    + 0x3)
#define CONTROL(p)  ((p)->base    + 0x2)
#define STATUS(p)   ((p)->base    + 0x1)
#define DATA(p)     ((p)->base    + 0x0)

struct parport_pc_private {
	/* Contents of CTR. */
	unsigned char ctr;

	/* Bitmask of writable CTR bits. */
	unsigned char ctr_writable;

	/* Whether or not there's an ECR. */
	int ecr;

	/* Number of PWords that FIFO will hold. */
	int fifo_depth;

	/* Number of bytes per portword. */
	int pword;

	/* Not used yet. */
	int readIntrThreshold;
	int writeIntrThreshold;

	/* buffer suitable for DMA, if DMA enabled */
	char *dma_buf;
	dma_addr_t dma_handle;
	struct list_head list;
	struct parport *port;
};

struct parport_pc_via_data
{
	/* ISA PnP IRQ routing register 1 */
	u8 via_pci_parport_irq_reg;
	/* ISA PnP DMA request routing register */
	u8 via_pci_parport_dma_reg;
	/* Register and value to enable SuperIO configuration access */
	u8 via_pci_superio_config_reg;
	u8 via_pci_superio_config_data;
	/* SuperIO function register number */
	u8 viacfg_function;
	/* parallel port control register number */
	u8 viacfg_parport_control;
	/* Parallel port base address register */
	u8 viacfg_parport_base;
};

static __inline__ void parport_pc_write_data(struct parport *p, unsigned char d)
{
#ifdef DEBUG_PARPORT
	printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d);
#endif
	outb(d, DATA(p));
}

static __inline__ unsigned char parport_pc_read_data(struct parport *p)
{
	unsigned char val = inb (DATA (p));
#ifdef DEBUG_PARPORT
	printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n",
		p, val);
#endif
	return val;
}

#ifdef DEBUG_PARPORT
static inline void dump_parport_state (char *str, struct parport *p)
{
	/* here's hoping that reading these ports won't side-effect anything underneath */
	unsigned char ecr = inb (ECONTROL (p));
	unsigned char dcr = inb (CONTROL (p));
	unsigned char dsr = inb (STATUS (p));
	static const char *const ecr_modes[] = {"SPP", "PS2", "PPFIFO", "ECP", "xXx", "yYy", "TST", "CFG"};
	const struct parport_pc_private *priv = p->physport->private_data;
	int i;

	printk (KERN_DEBUG "*** parport state (%s): ecr=[%s", str, ecr_modes[(ecr & 0xe0) >> 5]);
	if (ecr & 0x10) printk (",nErrIntrEn");
	if (ecr & 0x08) printk (",dmaEn");
	if (ecr & 0x04) printk (",serviceIntr");
	if (ecr & 0x02) printk (",f_full");
	if (ecr & 0x01) printk (",f_empty");
	for (i=0; i<2; i++) {
		printk ("]  dcr(%s)=[", i ? "soft" : "hard");
		dcr = i ? priv->ctr : inb (CONTROL (p));
	
		if (dcr & 0x20) {
			printk ("rev");
		} else {
			printk ("fwd");
		}
		if (dcr & 0x10) printk (",ackIntEn");
		if (!(dcr & 0x08)) printk (",N-SELECT-IN");
		if (dcr & 0x04) printk (",N-INIT");
		if (!(dcr & 0x02)) printk (",N-AUTOFD");
		if (!(dcr & 0x01)) printk (",N-STROBE");
	}
	printk ("]  dsr=[");
	if (!(dsr & 0x80)) printk ("BUSY");
	if (dsr & 0x40) printk (",N-ACK");
	if (dsr & 0x20) printk (",PERROR");
	if (dsr & 0x10) printk (",SELECT");
	if (dsr & 0x08) printk (",N-FAULT");
	printk ("]\n");
	return;
}
#else	/* !DEBUG_PARPORT */
#define dump_parport_state(args...)
#endif	/* !DEBUG_PARPORT */

/* __parport_pc_frob_control differs from parport_pc_frob_control in that
 * it doesn't do any extra masking. */
static __inline__ unsigned char __parport_pc_frob_control (struct parport *p,
							   unsigned char mask,
							   unsigned char val)
{
	struct parport_pc_private *priv = p->physport->private_data;
	unsigned char ctr = priv->ctr;
#ifdef DEBUG_PARPORT
	printk (KERN_DEBUG
		"__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n",
		mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
#endif
	ctr = (ctr & ~mask) ^ val;
	ctr &= priv->ctr_writable; /* only write writable bits. */
	outb (ctr, CONTROL (p));
	priv->ctr = ctr;	/* Update soft copy */
	return ctr;
}

static __inline__ void parport_pc_data_reverse (struct parport *p)
{
	__parport_pc_frob_control (p, 0x20, 0x20);
}

static __inline__ void parport_pc_data_forward (struct parport *p)
{
	__parport_pc_frob_control (p, 0x20, 0x00);
}

static __inline__ void parport_pc_write_control (struct parport *p,
						 unsigned char d)
{
	const unsigned char wm = (PARPORT_CONTROL_STROBE |
				  PARPORT_CONTROL_AUTOFD |
				  PARPORT_CONTROL_INIT |
				  PARPORT_CONTROL_SELECT);

	/* Take this out when drivers have adapted to newer interface. */
	if (d & 0x20) {
		printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
			p->name, p->cad->name);
		parport_pc_data_reverse (p);
	}

	__parport_pc_frob_control (p, wm, d & wm);
}

static __inline__ unsigned char parport_pc_read_control(struct parport *p)
{
	const unsigned char rm = (PARPORT_CONTROL_STROBE |
				  PARPORT_CONTROL_AUTOFD |
				  PARPORT_CONTROL_INIT |
				  PARPORT_CONTROL_SELECT);
	const struct parport_pc_private *priv = p->physport->private_data;
	return priv->ctr & rm; /* Use soft copy */
}

static __inline__ unsigned char parport_pc_frob_control (struct parport *p,
							 unsigned char mask,
							 unsigned char val)
{
	const unsigned char wm = (PARPORT_CONTROL_STROBE |
				  PARPORT_CONTROL_AUTOFD |
				  PARPORT_CONTROL_INIT |
				  PARPORT_CONTROL_SELECT);

	/* Take this out when drivers have adapted to newer interface. */
	if (mask & 0x20) {
		printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
			p->name, p->cad->name,
			(val & 0x20) ? "reverse" : "forward");
		if (val & 0x20)
			parport_pc_data_reverse (p);
		else
			parport_pc_data_forward (p);
	}

	/* Restrict mask and val to control lines. */
	mask &= wm;
	val &= wm;

	return __parport_pc_frob_control (p, mask, val);
}

static __inline__ unsigned char parport_pc_read_status(struct parport *p)
{
	return inb(STATUS(p));
}


static __inline__ void parport_pc_disable_irq(struct parport *p)
{
	__parport_pc_frob_control (p, 0x10, 0x00);
}

static __inline__ void parport_pc_enable_irq(struct parport *p)
{
	__parport_pc_frob_control (p, 0x10, 0x10);
}

extern void parport_pc_release_resources(struct parport *p);

extern int parport_pc_claim_resources(struct parport *p);

/* PCMCIA code will want to get us to look at a port.  Provide a mechanism. */
extern struct parport *parport_pc_probe_port(unsigned long base,
					     unsigned long base_hi,
					     int irq, int dma,
					     struct device *dev,
					     int irqflags);
extern void parport_pc_unregister_port(struct parport *p);

#endif
OpenPOWER on IntegriCloud