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
parport_readb(unsigned long port)30 static __inline__ unsigned char parport_readb( unsigned long port )
31 {
32 udelay(DELAY_TIME);
33 return gsc_readb(port);
34 }
35
parport_writeb(unsigned char value,unsigned long port)36 static __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
51 struct 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 char *dma_buf;
67 dma_addr_t dma_handle;
68 struct pci_dev *dev;
69 };
70
parport_gsc_write_data(struct parport * p,unsigned char d)71 static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
72 {
73 #ifdef DEBUG_PARPORT
74 printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
75 #endif
76 parport_writeb(d, DATA(p));
77 }
78
parport_gsc_read_data(struct parport * p)79 static inline unsigned char parport_gsc_read_data(struct parport *p)
80 {
81 unsigned char val = parport_readb (DATA (p));
82 #ifdef DEBUG_PARPORT
83 printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
84 p, val);
85 #endif
86 return val;
87 }
88
89 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
90 * it doesn't do any extra masking. */
__parport_gsc_frob_control(struct parport * p,unsigned char mask,unsigned char val)91 static inline unsigned char __parport_gsc_frob_control(struct parport *p,
92 unsigned char mask,
93 unsigned char val)
94 {
95 struct parport_gsc_private *priv = p->physport->private_data;
96 unsigned char ctr = priv->ctr;
97 #ifdef DEBUG_PARPORT
98 printk (KERN_DEBUG
99 "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
100 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
101 #endif
102 ctr = (ctr & ~mask) ^ val;
103 ctr &= priv->ctr_writable; /* only write writable bits. */
104 parport_writeb (ctr, CONTROL (p));
105 priv->ctr = ctr; /* Update soft copy */
106 return ctr;
107 }
108
parport_gsc_data_reverse(struct parport * p)109 static inline void parport_gsc_data_reverse(struct parport *p)
110 {
111 __parport_gsc_frob_control (p, 0x20, 0x20);
112 }
113
parport_gsc_data_forward(struct parport * p)114 static inline void parport_gsc_data_forward(struct parport *p)
115 {
116 __parport_gsc_frob_control (p, 0x20, 0x00);
117 }
118
parport_gsc_write_control(struct parport * p,unsigned char d)119 static inline void parport_gsc_write_control(struct parport *p,
120 unsigned char d)
121 {
122 const unsigned char wm = (PARPORT_CONTROL_STROBE |
123 PARPORT_CONTROL_AUTOFD |
124 PARPORT_CONTROL_INIT |
125 PARPORT_CONTROL_SELECT);
126
127 /* Take this out when drivers have adapted to newer interface. */
128 if (d & 0x20) {
129 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
130 p->name, p->cad->name);
131 parport_gsc_data_reverse (p);
132 }
133
134 __parport_gsc_frob_control (p, wm, d & wm);
135 }
136
parport_gsc_read_control(struct parport * p)137 static inline unsigned char parport_gsc_read_control(struct parport *p)
138 {
139 const unsigned char rm = (PARPORT_CONTROL_STROBE |
140 PARPORT_CONTROL_AUTOFD |
141 PARPORT_CONTROL_INIT |
142 PARPORT_CONTROL_SELECT);
143 const struct parport_gsc_private *priv = p->physport->private_data;
144 return priv->ctr & rm; /* Use soft copy */
145 }
146
parport_gsc_frob_control(struct parport * p,unsigned char mask,unsigned char val)147 static inline unsigned char parport_gsc_frob_control(struct parport *p,
148 unsigned char mask,
149 unsigned char val)
150 {
151 const unsigned char wm = (PARPORT_CONTROL_STROBE |
152 PARPORT_CONTROL_AUTOFD |
153 PARPORT_CONTROL_INIT |
154 PARPORT_CONTROL_SELECT);
155
156 /* Take this out when drivers have adapted to newer interface. */
157 if (mask & 0x20) {
158 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
159 p->name, p->cad->name,
160 (val & 0x20) ? "reverse" : "forward");
161 if (val & 0x20)
162 parport_gsc_data_reverse (p);
163 else
164 parport_gsc_data_forward (p);
165 }
166
167 /* Restrict mask and val to control lines. */
168 mask &= wm;
169 val &= wm;
170
171 return __parport_gsc_frob_control (p, mask, val);
172 }
173
parport_gsc_read_status(struct parport * p)174 static inline unsigned char parport_gsc_read_status(struct parport *p)
175 {
176 return parport_readb (STATUS(p));
177 }
178
parport_gsc_disable_irq(struct parport * p)179 static inline void parport_gsc_disable_irq(struct parport *p)
180 {
181 __parport_gsc_frob_control (p, 0x10, 0x00);
182 }
183
parport_gsc_enable_irq(struct parport * p)184 static inline void parport_gsc_enable_irq(struct parport *p)
185 {
186 __parport_gsc_frob_control (p, 0x10, 0x10);
187 }
188
189 extern void parport_gsc_release_resources(struct parport *p);
190
191 extern int parport_gsc_claim_resources(struct parport *p);
192
193 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
194
195 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
196
197 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
198
199 extern void parport_gsc_inc_use_count(void);
200
201 extern void parport_gsc_dec_use_count(void);
202
203 extern struct parport *parport_gsc_probe_port(unsigned long base,
204 unsigned long base_hi,
205 int irq, int dma,
206 struct parisc_device *padev);
207
208 #endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */
209