1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_PARPORT_PC_H
3 #define __LINUX_PARPORT_PC_H
4
5 #include <asm/io.h>
6
7 /* --- register definitions ------------------------------- */
8
9 #define ECONTROL(p) ((p)->base_hi + 0x2)
10 #define CONFIGB(p) ((p)->base_hi + 0x1)
11 #define CONFIGA(p) ((p)->base_hi + 0x0)
12 #define FIFO(p) ((p)->base_hi + 0x0)
13 #define EPPDATA(p) ((p)->base + 0x4)
14 #define EPPADDR(p) ((p)->base + 0x3)
15 #define CONTROL(p) ((p)->base + 0x2)
16 #define STATUS(p) ((p)->base + 0x1)
17 #define DATA(p) ((p)->base + 0x0)
18
19 struct parport_pc_private {
20 /* Contents of CTR. */
21 unsigned char ctr;
22
23 /* Bitmask of writable CTR bits. */
24 unsigned char ctr_writable;
25
26 /* Whether or not there's an ECR. */
27 int ecr;
28
29 /* Bitmask of writable ECR bits. */
30 unsigned char ecr_writable;
31
32 /* Number of PWords that FIFO will hold. */
33 int fifo_depth;
34
35 /* Number of bytes per portword. */
36 int pword;
37
38 /* Not used yet. */
39 int readIntrThreshold;
40 int writeIntrThreshold;
41
42 /* buffer suitable for DMA, if DMA enabled */
43 char *dma_buf;
44 dma_addr_t dma_handle;
45 struct list_head list;
46 struct parport *port;
47 };
48
49 struct parport_pc_via_data
50 {
51 /* ISA PnP IRQ routing register 1 */
52 u8 via_pci_parport_irq_reg;
53 /* ISA PnP DMA request routing register */
54 u8 via_pci_parport_dma_reg;
55 /* Register and value to enable SuperIO configuration access */
56 u8 via_pci_superio_config_reg;
57 u8 via_pci_superio_config_data;
58 /* SuperIO function register number */
59 u8 viacfg_function;
60 /* parallel port control register number */
61 u8 viacfg_parport_control;
62 /* Parallel port base address register */
63 u8 viacfg_parport_base;
64 };
65
66 static __inline__ void parport_pc_write_data(struct parport *p, unsigned char d)
67 {
68 #ifdef DEBUG_PARPORT
69 printk (KERN_DEBUG "parport_pc_write_data(%p,0x%02x)\n", p, d);
70 #endif
71 outb(d, DATA(p));
72 }
73
74 static __inline__ unsigned char parport_pc_read_data(struct parport *p)
75 {
76 unsigned char val = inb (DATA (p));
77 #ifdef DEBUG_PARPORT
78 printk (KERN_DEBUG "parport_pc_read_data(%p) = 0x%02x\n",
79 p, val);
80 #endif
81 return val;
82 }
83
84 #ifdef DEBUG_PARPORT
85 static inline void dump_parport_state (char *str, struct parport *p)
86 {
87 /* here's hoping that reading these ports won't side-effect anything underneath */
88 unsigned char ecr = inb (ECONTROL (p));
89 unsigned char dcr = inb (CONTROL (p));
90 unsigned char dsr = inb (STATUS (p));
91 static const char *const ecr_modes[] = {"SPP", "PS2", "PPFIFO", "ECP", "xXx", "yYy", "TST", "CFG"};
92 const struct parport_pc_private *priv = p->physport->private_data;
93 int i;
94
95 printk (KERN_DEBUG "*** parport state (%s): ecr=[%s", str, ecr_modes[(ecr & 0xe0) >> 5]);
96 if (ecr & 0x10) printk (",nErrIntrEn");
97 if (ecr & 0x08) printk (",dmaEn");
98 if (ecr & 0x04) printk (",serviceIntr");
99 if (ecr & 0x02) printk (",f_full");
100 if (ecr & 0x01) printk (",f_empty");
101 for (i=0; i<2; i++) {
102 printk ("] dcr(%s)=[", i ? "soft" : "hard");
103 dcr = i ? priv->ctr : inb (CONTROL (p));
104
105 if (dcr & 0x20) {
106 printk ("rev");
107 } else {
108 printk ("fwd");
109 }
110 if (dcr & 0x10) printk (",ackIntEn");
111 if (!(dcr & 0x08)) printk (",N-SELECT-IN");
112 if (dcr & 0x04) printk (",N-INIT");
113 if (!(dcr & 0x02)) printk (",N-AUTOFD");
114 if (!(dcr & 0x01)) printk (",N-STROBE");
115 }
116 printk ("] dsr=[");
117 if (!(dsr & 0x80)) printk ("BUSY");
118 if (dsr & 0x40) printk (",N-ACK");
119 if (dsr & 0x20) printk (",PERROR");
120 if (dsr & 0x10) printk (",SELECT");
121 if (dsr & 0x08) printk (",N-FAULT");
122 printk ("]\n");
123 return;
124 }
125 #else /* !DEBUG_PARPORT */
126 #define dump_parport_state(args...)
127 #endif /* !DEBUG_PARPORT */
128
129 /* __parport_pc_frob_control differs from parport_pc_frob_control in that
130 * it doesn't do any extra masking. */
131 static __inline__ unsigned char __parport_pc_frob_control (struct parport *p,
132 unsigned char mask,
133 unsigned char val)
134 {
135 struct parport_pc_private *priv = p->physport->private_data;
136 unsigned char ctr = priv->ctr;
137 #ifdef DEBUG_PARPORT
138 printk (KERN_DEBUG
139 "__parport_pc_frob_control(%02x,%02x): %02x -> %02x\n",
140 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
141 #endif
142 ctr = (ctr & ~mask) ^ val;
143 ctr &= priv->ctr_writable; /* only write writable bits. */
144 outb (ctr, CONTROL (p));
145 priv->ctr = ctr; /* Update soft copy */
146 return ctr;
147 }
148
149 static __inline__ void parport_pc_data_reverse (struct parport *p)
150 {
151 __parport_pc_frob_control (p, 0x20, 0x20);
152 }
153
154 static __inline__ void parport_pc_data_forward (struct parport *p)
155 {
156 __parport_pc_frob_control (p, 0x20, 0x00);
157 }
158
159 static __inline__ void parport_pc_write_control (struct parport *p,
160 unsigned char d)
161 {
162 const unsigned char wm = (PARPORT_CONTROL_STROBE |
163 PARPORT_CONTROL_AUTOFD |
164 PARPORT_CONTROL_INIT |
165 PARPORT_CONTROL_SELECT);
166
167 /* Take this out when drivers have adapted to newer interface. */
168 if (d & 0x20) {
169 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
170 p->name, p->cad->name);
171 parport_pc_data_reverse (p);
172 }
173
174 __parport_pc_frob_control (p, wm, d & wm);
175 }
176
177 static __inline__ unsigned char parport_pc_read_control(struct parport *p)
178 {
179 const unsigned char rm = (PARPORT_CONTROL_STROBE |
180 PARPORT_CONTROL_AUTOFD |
181 PARPORT_CONTROL_INIT |
182 PARPORT_CONTROL_SELECT);
183 const struct parport_pc_private *priv = p->physport->private_data;
184 return priv->ctr & rm; /* Use soft copy */
185 }
186
187 static __inline__ unsigned char parport_pc_frob_control (struct parport *p,
188 unsigned char mask,
189 unsigned char val)
190 {
191 const unsigned char wm = (PARPORT_CONTROL_STROBE |
192 PARPORT_CONTROL_AUTOFD |
193 PARPORT_CONTROL_INIT |
194 PARPORT_CONTROL_SELECT);
195
196 /* Take this out when drivers have adapted to newer interface. */
197 if (mask & 0x20) {
198 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
199 p->name, p->cad->name,
200 (val & 0x20) ? "reverse" : "forward");
201 if (val & 0x20)
202 parport_pc_data_reverse (p);
203 else
204 parport_pc_data_forward (p);
205 }
206
207 /* Restrict mask and val to control lines. */
208 mask &= wm;
209 val &= wm;
210
211 return __parport_pc_frob_control (p, mask, val);
212 }
213
214 static __inline__ unsigned char parport_pc_read_status(struct parport *p)
215 {
216 return inb(STATUS(p));
217 }
218
219
220 static __inline__ void parport_pc_disable_irq(struct parport *p)
221 {
222 __parport_pc_frob_control (p, 0x10, 0x00);
223 }
224
225 static __inline__ void parport_pc_enable_irq(struct parport *p)
226 {
227 __parport_pc_frob_control (p, 0x10, 0x10);
228 }
229
230 extern void parport_pc_release_resources(struct parport *p);
231
232 extern int parport_pc_claim_resources(struct parport *p);
233
234 /* PCMCIA code will want to get us to look at a port. Provide a mechanism. */
235 extern struct parport *parport_pc_probe_port(unsigned long base,
236 unsigned long base_hi,
237 int irq, int dma,
238 struct device *dev,
239 int irqflags);
240 extern void parport_pc_unregister_port(struct parport *p);
241
242 #endif
243
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.