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