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parport_pc.h
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1 #ifndef __LINUX_PARPORT_PC_H
2 #define __LINUX_PARPORT_PC_H
3 
4 #include <asm/io.h>
5 
6 /* --- register definitions ------------------------------- */
7 
8 #define ECONTROL(p) ((p)->base_hi + 0x2)
9 #define CONFIGB(p) ((p)->base_hi + 0x1)
10 #define CONFIGA(p) ((p)->base_hi + 0x0)
11 #define FIFO(p) ((p)->base_hi + 0x0)
12 #define EPPDATA(p) ((p)->base + 0x4)
13 #define EPPADDR(p) ((p)->base + 0x3)
14 #define CONTROL(p) ((p)->base + 0x2)
15 #define STATUS(p) ((p)->base + 0x1)
16 #define DATA(p) ((p)->base + 0x0)
17 
18 struct parport_pc_private {
19  /* Contents of CTR. */
20  unsigned char ctr;
21 
22  /* Bitmask of writable CTR bits. */
23  unsigned char ctr_writable;
24 
25  /* Whether or not there's an ECR. */
26  int ecr;
27 
28  /* Number of PWords that FIFO will hold. */
29  int fifo_depth;
30 
31  /* Number of bytes per portword. */
32  int pword;
33 
34  /* Not used yet. */
35  int readIntrThreshold;
36  int writeIntrThreshold;
37 
38  /* buffer suitable for DMA, if DMA enabled */
39  char *dma_buf;
40  dma_addr_t dma_handle;
41  struct list_head list;
42  struct parport *port;
43 };
44 
45 struct parport_pc_via_data
46 {
47  /* ISA PnP IRQ routing register 1 */
48  u8 via_pci_parport_irq_reg;
49  /* ISA PnP DMA request routing register */
50  u8 via_pci_parport_dma_reg;
51  /* Register and value to enable SuperIO configuration access */
52  u8 via_pci_superio_config_reg;
53  u8 via_pci_superio_config_data;
54  /* SuperIO function register number */
55  u8 viacfg_function;
56  /* parallel port control register number */
57  u8 viacfg_parport_control;
58  /* Parallel port base address register */
59  u8 viacfg_parport_base;
60 };
61 
62 static __inline__ void parport_pc_write_data(struct parport *p, unsigned char d)
63 {
64 #ifdef DEBUG_PARPORT
65  printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d);
66 #endif
67  outb(d, DATA(p));
68 }
69 
70 static __inline__ unsigned char parport_pc_read_data(struct parport *p)
71 {
72  unsigned char val = inb (DATA (p));
73 #ifdef DEBUG_PARPORT
74  printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n",
75  p, val);
76 #endif
77  return val;
78 }
79 
80 #ifdef DEBUG_PARPORT
81 static inline void dump_parport_state (char *str, struct parport *p)
82 {
83  /* here's hoping that reading these ports won't side-effect anything underneath */
84  unsigned char ecr = inb (ECONTROL (p));
85  unsigned char dcr = inb (CONTROL (p));
86  unsigned char dsr = inb (STATUS (p));
87  static const char *const ecr_modes[] = {"SPP", "PS2", "PPFIFO", "ECP", "xXx", "yYy", "TST", "CFG"};
88  const struct parport_pc_private *priv = p->physport->private_data;
89  int i;
90 
91  printk (KERN_DEBUG "*** parport state (%s): ecr=[%s", str, ecr_modes[(ecr & 0xe0) >> 5]);
92  if (ecr & 0x10) printk (",nErrIntrEn");
93  if (ecr & 0x08) printk (",dmaEn");
94  if (ecr & 0x04) printk (",serviceIntr");
95  if (ecr & 0x02) printk (",f_full");
96  if (ecr & 0x01) printk (",f_empty");
97  for (i=0; i<2; i++) {
98  printk ("] dcr(%s)=[", i ? "soft" : "hard");
99  dcr = i ? priv->ctr : inb (CONTROL (p));
100 
101  if (dcr & 0x20) {
102  printk ("rev");
103  } else {
104  printk ("fwd");
105  }
106  if (dcr & 0x10) printk (",ackIntEn");
107  if (!(dcr & 0x08)) printk (",N-SELECT-IN");
108  if (dcr & 0x04) printk (",N-INIT");
109  if (!(dcr & 0x02)) printk (",N-AUTOFD");
110  if (!(dcr & 0x01)) printk (",N-STROBE");
111  }
112  printk ("] dsr=[");
113  if (!(dsr & 0x80)) printk ("BUSY");
114  if (dsr & 0x40) printk (",N-ACK");
115  if (dsr & 0x20) printk (",PERROR");
116  if (dsr & 0x10) printk (",SELECT");
117  if (dsr & 0x08) printk (",N-FAULT");
118  printk ("]\n");
119  return;
120 }
121 #else /* !DEBUG_PARPORT */
122 #define dump_parport_state(args...)
123 #endif /* !DEBUG_PARPORT */
124 
125 /* __parport_pc_frob_control differs from parport_pc_frob_control in that
126  * it doesn't do any extra masking. */
127 static __inline__ unsigned char __parport_pc_frob_control (struct parport *p,
128  unsigned char mask,
129  unsigned char val)
130 {
131  struct parport_pc_private *priv = p->physport->private_data;
132  unsigned char ctr = priv->ctr;
133 #ifdef DEBUG_PARPORT
134  printk (KERN_DEBUG
135  "__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n",
136  mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
137 #endif
138  ctr = (ctr & ~mask) ^ val;
139  ctr &= priv->ctr_writable; /* only write writable bits. */
140  outb (ctr, CONTROL (p));
141  priv->ctr = ctr; /* Update soft copy */
142  return ctr;
143 }
144 
145 static __inline__ void parport_pc_data_reverse (struct parport *p)
146 {
147  __parport_pc_frob_control (p, 0x20, 0x20);
148 }
149 
150 static __inline__ void parport_pc_data_forward (struct parport *p)
151 {
152  __parport_pc_frob_control (p, 0x20, 0x00);
153 }
154 
155 static __inline__ void parport_pc_write_control (struct parport *p,
156  unsigned char d)
157 {
158  const unsigned char wm = (PARPORT_CONTROL_STROBE |
159  PARPORT_CONTROL_AUTOFD |
160  PARPORT_CONTROL_INIT |
161  PARPORT_CONTROL_SELECT);
162 
163  /* Take this out when drivers have adapted to newer interface. */
164  if (d & 0x20) {
165  printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
166  p->name, p->cad->name);
167  parport_pc_data_reverse (p);
168  }
169 
170  __parport_pc_frob_control (p, wm, d & wm);
171 }
172 
173 static __inline__ unsigned char parport_pc_read_control(struct parport *p)
174 {
175  const unsigned char rm = (PARPORT_CONTROL_STROBE |
176  PARPORT_CONTROL_AUTOFD |
177  PARPORT_CONTROL_INIT |
178  PARPORT_CONTROL_SELECT);
179  const struct parport_pc_private *priv = p->physport->private_data;
180  return priv->ctr & rm; /* Use soft copy */
181 }
182 
183 static __inline__ unsigned char parport_pc_frob_control (struct parport *p,
184  unsigned char mask,
185  unsigned char val)
186 {
187  const unsigned char wm = (PARPORT_CONTROL_STROBE |
188  PARPORT_CONTROL_AUTOFD |
189  PARPORT_CONTROL_INIT |
190  PARPORT_CONTROL_SELECT);
191 
192  /* Take this out when drivers have adapted to newer interface. */
193  if (mask & 0x20) {
194  printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
195  p->name, p->cad->name,
196  (val & 0x20) ? "reverse" : "forward");
197  if (val & 0x20)
198  parport_pc_data_reverse (p);
199  else
200  parport_pc_data_forward (p);
201  }
202 
203  /* Restrict mask and val to control lines. */
204  mask &= wm;
205  val &= wm;
206 
207  return __parport_pc_frob_control (p, mask, val);
208 }
209 
210 static __inline__ unsigned char parport_pc_read_status(struct parport *p)
211 {
212  return inb(STATUS(p));
213 }
214 
215 
216 static __inline__ void parport_pc_disable_irq(struct parport *p)
217 {
218  __parport_pc_frob_control (p, 0x10, 0x00);
219 }
220 
221 static __inline__ void parport_pc_enable_irq(struct parport *p)
222 {
223  __parport_pc_frob_control (p, 0x10, 0x10);
224 }
225 
226 extern void parport_pc_release_resources(struct parport *p);
227 
228 extern int parport_pc_claim_resources(struct parport *p);
229 
230 /* PCMCIA code will want to get us to look at a port. Provide a mechanism. */
231 extern struct parport *parport_pc_probe_port(unsigned long base,
232  unsigned long base_hi,
233  int irq, int dma,
234  struct device *dev,
235  int irqflags);
236 extern void parport_pc_unregister_port(struct parport *p);
237 
238 #endif
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