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Linux/drivers/parport/parport_amiga.c

  1 /* Low-level parallel port routines for the Amiga built-in port
  2  *
  3  * Author: Joerg Dorchain <joerg@dorchain.net>
  4  *
  5  * This is a complete rewrite of the code, but based heaviy upon the old
  6  * lp_intern. code.
  7  *
  8  * The built-in Amiga parallel port provides one port at a fixed address
  9  * with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status
 10  * lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically
 11  * in hardware when the data register is accessed), and 1 input control line
 12  * /ACK, able to cause an interrupt, but both not directly settable by
 13  * software.
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/init.h>
 18 #include <linux/parport.h>
 19 #include <linux/ioport.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/platform_device.h>
 22 
 23 #include <asm/setup.h>
 24 #include <asm/amigahw.h>
 25 #include <asm/irq.h>
 26 #include <asm/io.h>
 27 #include <asm/amigaints.h>
 28 
 29 #undef DEBUG
 30 #ifdef DEBUG
 31 #define DPRINTK printk
 32 #else
 33 #define DPRINTK(x...)   do { } while (0)
 34 #endif
 35 
 36 
 37 static void amiga_write_data(struct parport *p, unsigned char data)
 38 {
 39         DPRINTK(KERN_DEBUG "write_data %c\n",data);
 40         /* Triggers also /STROBE. This behavior cannot be changed */
 41         ciaa.prb = data;
 42         mb();
 43 }
 44 
 45 static unsigned char amiga_read_data(struct parport *p)
 46 {
 47         /* Triggers also /STROBE. This behavior cannot be changed */
 48         return ciaa.prb;
 49 }
 50 
 51 static unsigned char control_amiga_to_pc(unsigned char control)
 52 {
 53         return PARPORT_CONTROL_SELECT |
 54               PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
 55         /* fake value: interrupt enable, select in, no reset,
 56         no autolf, no strobe - seems to be closest the wiring diagram */
 57 }
 58 
 59 static void amiga_write_control(struct parport *p, unsigned char control)
 60 {
 61         DPRINTK(KERN_DEBUG "write_control %02x\n",control);
 62         /* No implementation possible */
 63 }
 64         
 65 static unsigned char amiga_read_control( struct parport *p)
 66 {
 67         DPRINTK(KERN_DEBUG "read_control \n");
 68         return control_amiga_to_pc(0);
 69 }
 70 
 71 static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
 72 {
 73         unsigned char old;
 74 
 75         DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
 76         old = amiga_read_control(p);
 77         amiga_write_control(p, (old & ~mask) ^ val);
 78         return old;
 79 }
 80 
 81 static unsigned char status_amiga_to_pc(unsigned char status)
 82 {
 83         unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
 84 
 85         if (status & 1) /* Busy */
 86                 ret &= ~PARPORT_STATUS_BUSY;
 87         if (status & 2) /* PaperOut */
 88                 ret |= PARPORT_STATUS_PAPEROUT;
 89         if (status & 4) /* Selected */
 90                 ret |= PARPORT_STATUS_SELECT;
 91         /* the rest is not connected or handled autonomously in hardware */
 92 
 93         return ret;
 94 }
 95 
 96 static unsigned char amiga_read_status(struct parport *p)
 97 {
 98         unsigned char status;
 99 
100         status = status_amiga_to_pc(ciab.pra & 7);
101         DPRINTK(KERN_DEBUG "read_status %02x\n", status);
102         return status;
103 }
104 
105 static void amiga_enable_irq(struct parport *p)
106 {
107         enable_irq(IRQ_AMIGA_CIAA_FLG);
108 }
109 
110 static void amiga_disable_irq(struct parport *p)
111 {
112         disable_irq(IRQ_AMIGA_CIAA_FLG);
113 }
114 
115 static void amiga_data_forward(struct parport *p)
116 {
117         DPRINTK(KERN_DEBUG "forward\n");
118         ciaa.ddrb = 0xff; /* all pins output */
119         mb();
120 }
121 
122 static void amiga_data_reverse(struct parport *p)
123 {
124         DPRINTK(KERN_DEBUG "reverse\n");
125         ciaa.ddrb = 0; /* all pins input */
126         mb();
127 }
128 
129 static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
130 {
131         s->u.amiga.data = 0;
132         s->u.amiga.datadir = 255;
133         s->u.amiga.status = 0;
134         s->u.amiga.statusdir = 0;
135 }
136 
137 static void amiga_save_state(struct parport *p, struct parport_state *s)
138 {
139         mb();
140         s->u.amiga.data = ciaa.prb;
141         s->u.amiga.datadir = ciaa.ddrb;
142         s->u.amiga.status = ciab.pra & 7;
143         s->u.amiga.statusdir = ciab.ddra & 7;
144         mb();
145 }
146 
147 static void amiga_restore_state(struct parport *p, struct parport_state *s)
148 {
149         mb();
150         ciaa.prb = s->u.amiga.data;
151         ciaa.ddrb = s->u.amiga.datadir;
152         ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
153         ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
154         mb();
155 }
156 
157 static struct parport_operations pp_amiga_ops = {
158         .write_data     = amiga_write_data,
159         .read_data      = amiga_read_data,
160 
161         .write_control  = amiga_write_control,
162         .read_control   = amiga_read_control,
163         .frob_control   = amiga_frob_control,
164 
165         .read_status    = amiga_read_status,
166 
167         .enable_irq     = amiga_enable_irq,
168         .disable_irq    = amiga_disable_irq,
169 
170         .data_forward   = amiga_data_forward,
171         .data_reverse   = amiga_data_reverse,
172 
173         .init_state     = amiga_init_state,
174         .save_state     = amiga_save_state,
175         .restore_state  = amiga_restore_state,
176 
177         .epp_write_data = parport_ieee1284_epp_write_data,
178         .epp_read_data  = parport_ieee1284_epp_read_data,
179         .epp_write_addr = parport_ieee1284_epp_write_addr,
180         .epp_read_addr  = parport_ieee1284_epp_read_addr,
181 
182         .ecp_write_data = parport_ieee1284_ecp_write_data,
183         .ecp_read_data  = parport_ieee1284_ecp_read_data,
184         .ecp_write_addr = parport_ieee1284_ecp_write_addr,
185 
186         .compat_write_data      = parport_ieee1284_write_compat,
187         .nibble_read_data       = parport_ieee1284_read_nibble,
188         .byte_read_data         = parport_ieee1284_read_byte,
189 
190         .owner          = THIS_MODULE,
191 };
192 
193 /* ----------- Initialisation code --------------------------------- */
194 
195 static int __init amiga_parallel_probe(struct platform_device *pdev)
196 {
197         struct parport *p;
198         int err;
199 
200         ciaa.ddrb = 0xff;
201         ciab.ddra &= 0xf8;
202         mb();
203 
204         p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
205                                    PARPORT_DMA_NONE, &pp_amiga_ops);
206         if (!p)
207                 return -EBUSY;
208 
209         err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
210                           p);
211         if (err)
212                 goto out_irq;
213 
214         printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
215         /* XXX: set operating mode */
216         parport_announce_port(p);
217 
218         platform_set_drvdata(pdev, p);
219 
220         return 0;
221 
222 out_irq:
223         parport_put_port(p);
224         return err;
225 }
226 
227 static int __exit amiga_parallel_remove(struct platform_device *pdev)
228 {
229         struct parport *port = platform_get_drvdata(pdev);
230 
231         parport_remove_port(port);
232         if (port->irq != PARPORT_IRQ_NONE)
233                 free_irq(IRQ_AMIGA_CIAA_FLG, port);
234         parport_put_port(port);
235         return 0;
236 }
237 
238 static struct platform_driver amiga_parallel_driver = {
239         .remove = __exit_p(amiga_parallel_remove),
240         .driver   = {
241                 .name   = "amiga-parallel",
242                 .owner  = THIS_MODULE,
243         },
244 };
245 
246 module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
247 
248 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
249 MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
250 MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
251 MODULE_LICENSE("GPL");
252 MODULE_ALIAS("platform:amiga-parallel");
253 

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