Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
parport_gsc.h
Go to the documentation of this file.
1 /*
2  * Low-level parallel-support for PC-style hardware integrated in the
3  * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
4  *
5  * (C) 1999-2001 by Helge Deller <[email protected]>
6  *
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  *
22  * based on parport_pc.c by
23  * Grant Guenther <[email protected]>
24  * Phil Blundell <[email protected]>
25  * Tim Waugh <[email protected]>
26  * Jose Renau <[email protected]>
27  * David Campbell
28  * Andrea Arcangeli
29  */
30 
31 #ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
32 #define __DRIVERS_PARPORT_PARPORT_GSC_H
33 
34 #include <asm/io.h>
35 #include <linux/delay.h>
36 
37 #undef DEBUG_PARPORT /* undefine for production */
38 #define DELAY_TIME 0
39 
40 #if DELAY_TIME == 0
41 #define parport_readb gsc_readb
42 #define parport_writeb gsc_writeb
43 #else
44 static __inline__ unsigned char parport_readb( unsigned long port )
45 {
46  udelay(DELAY_TIME);
47  return gsc_readb(port);
48 }
49 
50 static __inline__ void parport_writeb( unsigned char value, unsigned long port )
51 {
52  gsc_writeb(value,port);
53  udelay(DELAY_TIME);
54 }
55 #endif
56 
57 /* --- register definitions ------------------------------- */
58 
59 #define EPPDATA(p) ((p)->base + 0x4)
60 #define EPPADDR(p) ((p)->base + 0x3)
61 #define CONTROL(p) ((p)->base + 0x2)
62 #define STATUS(p) ((p)->base + 0x1)
63 #define DATA(p) ((p)->base + 0x0)
64 
65 struct parport_gsc_private {
66  /* Contents of CTR. */
67  unsigned char ctr;
68 
69  /* Bitmask of writable CTR bits. */
70  unsigned char ctr_writable;
71 
72  /* Number of bytes per portword. */
73  int pword;
74 
75  /* Not used yet. */
76  int readIntrThreshold;
77  int writeIntrThreshold;
78 
79  /* buffer suitable for DMA, if DMA enabled */
80  char *dma_buf;
81  dma_addr_t dma_handle;
82  struct pci_dev *dev;
83 };
84 
85 static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
86 {
87 #ifdef DEBUG_PARPORT
88  printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
89 #endif
90  parport_writeb(d, DATA(p));
91 }
92 
93 static inline unsigned char parport_gsc_read_data(struct parport *p)
94 {
95  unsigned char val = parport_readb (DATA (p));
96 #ifdef DEBUG_PARPORT
97  printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
98  p, val);
99 #endif
100  return val;
101 }
102 
103 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
104  * it doesn't do any extra masking. */
105 static inline unsigned char __parport_gsc_frob_control(struct parport *p,
106  unsigned char mask,
107  unsigned char val)
108 {
109  struct parport_gsc_private *priv = p->physport->private_data;
110  unsigned char ctr = priv->ctr;
111 #ifdef DEBUG_PARPORT
112  printk (KERN_DEBUG
113  "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
114  mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
115 #endif
116  ctr = (ctr & ~mask) ^ val;
117  ctr &= priv->ctr_writable; /* only write writable bits. */
118  parport_writeb (ctr, CONTROL (p));
119  priv->ctr = ctr; /* Update soft copy */
120  return ctr;
121 }
122 
123 static inline void parport_gsc_data_reverse(struct parport *p)
124 {
125  __parport_gsc_frob_control (p, 0x20, 0x20);
126 }
127 
128 static inline void parport_gsc_data_forward(struct parport *p)
129 {
130  __parport_gsc_frob_control (p, 0x20, 0x00);
131 }
132 
133 static inline void parport_gsc_write_control(struct parport *p,
134  unsigned char d)
135 {
136  const unsigned char wm = (PARPORT_CONTROL_STROBE |
137  PARPORT_CONTROL_AUTOFD |
138  PARPORT_CONTROL_INIT |
139  PARPORT_CONTROL_SELECT);
140 
141  /* Take this out when drivers have adapted to newer interface. */
142  if (d & 0x20) {
143  printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
144  p->name, p->cad->name);
145  parport_gsc_data_reverse (p);
146  }
147 
148  __parport_gsc_frob_control (p, wm, d & wm);
149 }
150 
151 static inline unsigned char parport_gsc_read_control(struct parport *p)
152 {
153  const unsigned char rm = (PARPORT_CONTROL_STROBE |
154  PARPORT_CONTROL_AUTOFD |
155  PARPORT_CONTROL_INIT |
156  PARPORT_CONTROL_SELECT);
157  const struct parport_gsc_private *priv = p->physport->private_data;
158  return priv->ctr & rm; /* Use soft copy */
159 }
160 
161 static inline unsigned char parport_gsc_frob_control(struct parport *p,
162  unsigned char mask,
163  unsigned char val)
164 {
165  const unsigned char wm = (PARPORT_CONTROL_STROBE |
166  PARPORT_CONTROL_AUTOFD |
167  PARPORT_CONTROL_INIT |
168  PARPORT_CONTROL_SELECT);
169 
170  /* Take this out when drivers have adapted to newer interface. */
171  if (mask & 0x20) {
172  printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
173  p->name, p->cad->name,
174  (val & 0x20) ? "reverse" : "forward");
175  if (val & 0x20)
176  parport_gsc_data_reverse (p);
177  else
178  parport_gsc_data_forward (p);
179  }
180 
181  /* Restrict mask and val to control lines. */
182  mask &= wm;
183  val &= wm;
184 
185  return __parport_gsc_frob_control (p, mask, val);
186 }
187 
188 static inline unsigned char parport_gsc_read_status(struct parport *p)
189 {
190  return parport_readb (STATUS(p));
191 }
192 
193 static inline void parport_gsc_disable_irq(struct parport *p)
194 {
195  __parport_gsc_frob_control (p, 0x10, 0x00);
196 }
197 
198 static inline void parport_gsc_enable_irq(struct parport *p)
199 {
200  __parport_gsc_frob_control (p, 0x10, 0x10);
201 }
202 
203 extern void parport_gsc_release_resources(struct parport *p);
204 
205 extern int parport_gsc_claim_resources(struct parport *p);
206 
207 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
208 
209 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
210 
211 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
212 
213 extern void parport_gsc_inc_use_count(void);
214 
215 extern void parport_gsc_dec_use_count(void);
216 
217 extern struct parport *parport_gsc_probe_port(unsigned long base,
218  unsigned long base_hi,
219  int irq, int dma,
220  struct pci_dev *dev);
221 
222 #endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */
Generated on Thu Jan 10 2013 14:13:47 for Linux Kernel by   doxygen 1.8.2