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 }, 243 }; 244 245 module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe); 246 247 MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 248 MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); 249 MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); 250 MODULE_LICENSE("GPL"); 251 MODULE_ALIAS("platform:amiga-parallel"); 252