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 <asm/setup.h> 22#include <asm/amigahw.h> 23#include <asm/irq.h> 24#include <asm/io.h> 25#include <asm/amigaints.h> 26 27#undef DEBUG 28#ifdef DEBUG 29#define DPRINTK printk 30#else 31#define DPRINTK(x...) do { } while (0) 32#endif 33 34static struct parport *this_port = NULL; 35 36static void amiga_write_data(struct parport *p, unsigned char data) 37{ 38 DPRINTK(KERN_DEBUG "write_data %c\n",data); 39 /* Triggers also /STROBE. This behavior cannot be changed */ 40 ciaa.prb = data; 41 mb(); 42} 43 44static unsigned char amiga_read_data(struct parport *p) 45{ 46 /* Triggers also /STROBE. This behavior cannot be changed */ 47 return ciaa.prb; 48} 49 50 51static 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 59static 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 65static 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 71static 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 82static unsigned char status_amiga_to_pc(unsigned char status) 83{ 84 unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR; 85 86 if (status & 1) /* Busy */ 87 ret &= ~PARPORT_STATUS_BUSY; 88 if (status & 2) /* PaperOut */ 89 ret |= PARPORT_STATUS_PAPEROUT; 90 if (status & 4) /* Selected */ 91 ret |= PARPORT_STATUS_SELECT; 92 /* the rest is not connected or handled autonomously in hardware */ 93 94 return ret; 95} 96 97static unsigned char amiga_read_status(struct parport *p) 98{ 99 unsigned char status; 100 101 status = status_amiga_to_pc(ciab.pra & 7); 102 DPRINTK(KERN_DEBUG "read_status %02x\n", status); 103 return status; 104} 105 106/* as this ports irq handling is already done, we use a generic funktion */ 107static irqreturn_t amiga_interrupt(int irq, void *dev_id) 108{ 109 parport_generic_irq(irq, (struct parport *) dev_id); 110 return IRQ_HANDLED; 111} 112 113static void amiga_enable_irq(struct parport *p) 114{ 115 enable_irq(IRQ_AMIGA_CIAA_FLG); 116} 117 118static void amiga_disable_irq(struct parport *p) 119{ 120 disable_irq(IRQ_AMIGA_CIAA_FLG); 121} 122 123static void amiga_data_forward(struct parport *p) 124{ 125 DPRINTK(KERN_DEBUG "forward\n"); 126 ciaa.ddrb = 0xff; /* all pins output */ 127 mb(); 128} 129 130static void amiga_data_reverse(struct parport *p) 131{ 132 DPRINTK(KERN_DEBUG "reverse\n"); 133 ciaa.ddrb = 0; /* all pins input */ 134 mb(); 135} 136 137static void amiga_init_state(struct pardevice *dev, struct parport_state *s) 138{ 139 s->u.amiga.data = 0; 140 s->u.amiga.datadir = 255; 141 s->u.amiga.status = 0; 142 s->u.amiga.statusdir = 0; 143} 144 145static void amiga_save_state(struct parport *p, struct parport_state *s) 146{ 147 mb(); 148 s->u.amiga.data = ciaa.prb; 149 s->u.amiga.datadir = ciaa.ddrb; 150 s->u.amiga.status = ciab.pra & 7; 151 s->u.amiga.statusdir = ciab.ddra & 7; 152 mb(); 153} 154 155static void amiga_restore_state(struct parport *p, struct parport_state *s) 156{ 157 mb(); 158 ciaa.prb = s->u.amiga.data; 159 ciaa.ddrb = s->u.amiga.datadir; 160 ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status; 161 ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir; 162 mb(); 163} 164 165static struct parport_operations pp_amiga_ops = { 166 .write_data = amiga_write_data, 167 .read_data = amiga_read_data, 168 169 .write_control = amiga_write_control, 170 .read_control = amiga_read_control, 171 .frob_control = amiga_frob_control, 172 173 .read_status = amiga_read_status, 174 175 .enable_irq = amiga_enable_irq, 176 .disable_irq = amiga_disable_irq, 177 178 .data_forward = amiga_data_forward, 179 .data_reverse = amiga_data_reverse, 180 181 .init_state = amiga_init_state, 182 .save_state = amiga_save_state, 183 .restore_state = amiga_restore_state, 184 185 .epp_write_data = parport_ieee1284_epp_write_data, 186 .epp_read_data = parport_ieee1284_epp_read_data, 187 .epp_write_addr = parport_ieee1284_epp_write_addr, 188 .epp_read_addr = parport_ieee1284_epp_read_addr, 189 190 .ecp_write_data = parport_ieee1284_ecp_write_data, 191 .ecp_read_data = parport_ieee1284_ecp_read_data, 192 .ecp_write_addr = parport_ieee1284_ecp_write_addr, 193 194 .compat_write_data = parport_ieee1284_write_compat, 195 .nibble_read_data = parport_ieee1284_read_nibble, 196 .byte_read_data = parport_ieee1284_read_byte, 197 198 .owner = THIS_MODULE, 199}; 200 201/* ----------- Initialisation code --------------------------------- */ 202 203static int __init parport_amiga_init(void) 204{ 205 struct parport *p; 206 int err; 207 208 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_PARALLEL)) 209 return -ENODEV; 210 211 err = -EBUSY; 212 if (!request_mem_region(CIAA_PHYSADDR-1+0x100, 0x100, "parallel")) 213 goto out_mem; 214 215 ciaa.ddrb = 0xff; 216 ciab.ddra &= 0xf8; 217 mb(); 218 219 p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG, 220 PARPORT_DMA_NONE, &pp_amiga_ops); 221 if (!p) 222 goto out_port; 223 224 err = request_irq(IRQ_AMIGA_CIAA_FLG, amiga_interrupt, 0, p->name, p); 225 if (err) 226 goto out_irq; 227 228 this_port = p; 229 printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name); 230 parport_announce_port(p); 231 232 return 0; 233 234out_irq: 235 parport_put_port(p); 236out_port: 237 release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); 238out_mem: 239 return err; 240} 241 242static void __exit parport_amiga_exit(void) 243{ 244 parport_remove_port(this_port); 245 if (this_port->irq != PARPORT_IRQ_NONE) 246 free_irq(IRQ_AMIGA_CIAA_FLG, this_port); 247 parport_put_port(this_port); 248 release_mem_region(CIAA_PHYSADDR-1+0x100, 0x100); 249} 250 251 252MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); 253MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); 254MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port"); 255MODULE_LICENSE("GPL"); 256 257module_init(parport_amiga_init) 258module_exit(parport_amiga_exit) 259