1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Low-level parallel-support for PC-style hardware integrated in the
4 * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
6 * (C) 1999-2001 by Helge Deller <deller@gmx.de>
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>
17 #ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
18 #define __DRIVERS_PARPORT_PARPORT_GSC_H
21 #include <linux/delay.h>
23 #undef DEBUG_PARPORT /* undefine for production */
27 #define parport_readb gsc_readb
28 #define parport_writeb gsc_writeb
30 static __inline__ unsigned char parport_readb( unsigned long port )
33 return gsc_readb(port);
36 static __inline__ void parport_writeb( unsigned char value, unsigned long port )
38 gsc_writeb(value,port);
43 /* --- register definitions ------------------------------- */
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)
51 struct parport_gsc_private {
52 /* Contents of CTR. */
55 /* Bitmask of writable CTR bits. */
56 unsigned char ctr_writable;
58 /* Number of bytes per portword. */
62 int readIntrThreshold;
63 int writeIntrThreshold;
65 /* buffer suitable for DMA, if DMA enabled */
69 static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
72 printk(KERN_DEBUG "%s(%p,0x%02x)\n", __func__, p, d);
74 parport_writeb(d, DATA(p));
77 static inline unsigned char parport_gsc_read_data(struct parport *p)
79 unsigned char val = parport_readb (DATA (p));
81 printk(KERN_DEBUG "%s(%p) = 0x%02x\n", __func__, p, val);
86 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
87 * it doesn't do any extra masking. */
88 static inline unsigned char __parport_gsc_frob_control(struct parport *p,
92 struct parport_gsc_private *priv = p->physport->private_data;
93 unsigned char ctr = priv->ctr;
95 printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n",
97 ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
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 */
106 static inline void parport_gsc_data_reverse(struct parport *p)
108 __parport_gsc_frob_control (p, 0x20, 0x20);
111 static inline void parport_gsc_data_forward(struct parport *p)
113 __parport_gsc_frob_control (p, 0x20, 0x00);
116 static inline void parport_gsc_write_control(struct parport *p,
119 const unsigned char wm = (PARPORT_CONTROL_STROBE |
120 PARPORT_CONTROL_AUTOFD |
121 PARPORT_CONTROL_INIT |
122 PARPORT_CONTROL_SELECT);
124 /* Take this out when drivers have adapted to newer interface. */
126 printk(KERN_DEBUG "%s (%s): use data_reverse for this!\n",
127 p->name, p->cad->name);
128 parport_gsc_data_reverse (p);
131 __parport_gsc_frob_control (p, wm, d & wm);
134 static inline unsigned char parport_gsc_read_control(struct parport *p)
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 */
144 static inline unsigned char parport_gsc_frob_control(struct parport *p,
148 const unsigned char wm = (PARPORT_CONTROL_STROBE |
149 PARPORT_CONTROL_AUTOFD |
150 PARPORT_CONTROL_INIT |
151 PARPORT_CONTROL_SELECT);
153 /* Take this out when drivers have adapted to newer interface. */
155 printk(KERN_DEBUG "%s (%s): use data_%s for this!\n",
156 p->name, p->cad->name,
157 (val & 0x20) ? "reverse" : "forward");
159 parport_gsc_data_reverse (p);
161 parport_gsc_data_forward (p);
164 /* Restrict mask and val to control lines. */
168 return __parport_gsc_frob_control (p, mask, val);
171 static inline unsigned char parport_gsc_read_status(struct parport *p)
173 return parport_readb (STATUS(p));
176 static inline void parport_gsc_disable_irq(struct parport *p)
178 __parport_gsc_frob_control (p, 0x10, 0x00);
181 static inline void parport_gsc_enable_irq(struct parport *p)
183 __parport_gsc_frob_control (p, 0x10, 0x10);
186 extern void parport_gsc_release_resources(struct parport *p);
188 extern int parport_gsc_claim_resources(struct parport *p);
190 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
192 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
194 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
196 extern void parport_gsc_inc_use_count(void);
198 extern void parport_gsc_dec_use_count(void);
200 #endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */