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 37static 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 45static 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 52static unsigned char control_amiga_to_pc(unsigned char control) 53{ 54 return PARPORT_CONTROL_SELECT | 55 PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE; 56 /* fake value: interrupt enable, select in, no reset, 57 no autolf, no strobe - seems to be closest the wiring diagram */ 58} 59 60static void amiga_write_control(struct parport *p, unsigned char control) 61{ 62 DPRINTK(KERN_DEBUG "write_control %02x\n",control); 63 /* No implementation possible */ 64} 65 66static unsigned char amiga_read_control( struct parport *p) 67{ 68 DPRINTK(KERN_DEBUG "read_control \n"); 69 return control_amiga_to_pc(0); 70} 71 72static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val) 73{ 74 unsigned char old; 75 76 DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val); 77 old = amiga_read_control(p); 78 amiga_write_control(p, (old & ~mask) ^ val); 79 return old; 80} 81 82 83static unsigned char status_amiga_to_pc(unsigned char status) 84{ 85 unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR; 86 87 if (status & 1) /* Busy */ 88 ret &= ~PARPORT_STATUS_BUSY; 89 if (status & 2) /* PaperOut */ 90 ret |= PARPORT_STATUS_PAPEROUT; 91 if (status & 4) /* Selected */ 92 ret |= PARPORT_STATUS_SELECT; 93 /* the rest is not connected or handled autonomously in hardware */ 94 95 return ret; 96} 97 98static unsigned char amiga_read_status(struct parport *p) 99{ 100 unsigned char status; 101 102 status = status_amiga_to_pc(ciab.pra & 7); 103 DPRINTK(KERN_DEBUG "read_status %02x\n", status); 104 return status; 105} 106 107static void amiga_enable_irq(struct parport *p) 108{ 109 enable_irq(IRQ_AMIGA_CIAA_FLG); 110} 111 112static void amiga_disable_irq(struct parport *p) 113{ 114 disable_irq(IRQ_AMIGA_CIAA_FLG); 115} 116 117static void amiga_data_forward(struct parport *p) 118{ 119 DPRINTK(KERN_DEBUG "forward\n"); 120 ciaa.ddrb = 0xff; /* all pins output */ 121 mb(); 122} 123 124static void amiga_data_reverse(struct parport *p) 125{ 126 DPRINTK(KERN_DEBUG "reverse\n"); 127 ciaa.ddrb = 0; /* all pins input */ 128 mb(); 129} 130 131static void amiga_init_state(struct pardevice *dev, struct parport_state *s) 132{ 133 s->u.amiga.data = 0; 134 s->u.amiga.datadir = 255; 135 s->u.amiga.status = 0; 136 s->u.amiga.statusdir = 0; 137} 138 139static void amiga_save_state(struct parport *p, struct parport_state *s) 140{ 141 mb(); 142 s->u.amiga.data = ciaa.prb; 143 s->u.amiga.datadir = ciaa.ddrb; 144 s->u.amiga.status = ciab.pra & 7; 145 s->u.amiga.statusdir = ciab.ddra & 7; 146 mb(); 147} 148 149static void amiga_restore_state(struct parport *p, struct parport_state *s) 150{ 151 mb(); 152 ciaa.prb = s->u.amiga.data; 153 ciaa.ddrb = s->u.amiga.datadir; 154 ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status; 155 ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir; 156 mb(); 157} 158 159static struct parport_operations pp_amiga_ops = { 160 .write_data = amiga_write_data, 161 .read_data = amiga_read_data, 162 163 .write_control = amiga_write_control, 164 .read_control = amiga_read_control, 165 .frob_control = amiga_frob_control, 166 167 .read_status = amiga_read_status, 168 169 .enable_irq = amiga_enable_irq, 170 .disable_irq = amiga_disable_irq, 171 172 .data_forward = amiga_data_forward, 173 .data_reverse = amiga_data_reverse, 174 175 .init_state = amiga_init_state, 176 .save_state = amiga_save_state, 177 .restore_state = amiga_restore_state, 178 179 .epp_write_data = parport_ieee1284_epp_write_data, 180 .epp_read_data = parport_ieee1284_epp_read_data, 181 .epp_write_addr = parport_ieee1284_epp_write_addr, 182 .epp_read_addr = parport_ieee1284_epp_read_addr, 183 184 .ecp_write_data = parport_ieee1284_ecp_write_data, 185 .ecp_read_data = parport_ieee1284_ecp_read_data, 186 .ecp_write_addr = parport_ieee1284_ecp_write_addr, 187 188 .compat_write_data = parport_ieee1284_write_compat, 189 .nibble_read_data = parport_ieee1284_read_nibble, 190 .byte_read_data = parport_ieee1284_read_byte, 191 192 .owner = THIS_MODULE, 193}; 194 195/* ----------- Initialisation code --------------------------------- */ 196 197static int __init amiga_parallel_probe(struct platform_device *pdev) 198{ 199 struct parport *p; 200 int err; 201 202 ciaa.ddrb = 0xff; 203 ciab.ddra &= 0xf8; 204 mb(); 205 206 p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG, 207 PARPORT_DMA_NONE, &pp_amiga_ops); 208 if (!p) 209 return -EBUSY; 210 211 err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name, 212 p); 213 if (err) 214 goto out_irq; 215 216 printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name); 217 parport_announce_port(p); 218 219 platform_set_drvdata(pdev, p); 220 221 return 0; 222 223out_irq: 224 parport_put_port(p); 225 return err; 226} 227 228static int __exit amiga_parallel_remove(struct platform_device *pdev) 229{ 230 struct parport *port = platform_get_drvdata(pdev); 231 232 parport_remove_port(port); 233 if (port->irq != PARPORT_IRQ_NONE) 234 free_irq(IRQ_AMIGA_CIAA_FLG, port); 235 parport_put_port(port); 236 platform_set_drvdata(pdev, NULL); 237 return 0; 238} 239 240static struct platform_driver amiga_parallel_driver = { 241 .remove = __exit_p(amiga_parallel_remove), 242 .driver = { 243 .name = "amiga-parallel", 244 .owner = THIS_MODULE, 245 }, 246}; 247 248static int __init amiga_parallel_init(void) 249{ 250 return platform_driver_probe(&amiga_parallel_driver, 251 amiga_parallel_probe); 252} 253 254module_init(amiga_parallel_init); 255 256static void __exit amiga_parallel_exit(void) 257{ 258 platform_driver_unregister(&amiga_parallel_driver); 259} 260 261module_exit(amiga_parallel_exit); 262 263MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 264MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); 265MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); 266MODULE_LICENSE("GPL"); 267MODULE_ALIAS("platform:amiga-parallel"); 268