252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
/* Low-level parallel port routines for the Amiga built-in port
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*
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* Author: Joerg Dorchain <joerg@dorchain.net>
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*
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* This is a complete rewrite of the code, but based heaviy upon the old
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* lp_intern. code.
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*
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* The built-in Amiga parallel port provides one port at a fixed address
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* with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status
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* lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically
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* in hardware when the data register is accessed), and 1 input control line
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* /ACK, able to cause an interrupt, but both not directly settable by
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* software.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/parport.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <asm/setup.h>
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#include <asm/amigahw.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/amigaints.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DPRINTK printk
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#else
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#define DPRINTK(x...) do { } while (0)
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#endif
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static void amiga_write_data(struct parport *p, unsigned char data)
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{
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DPRINTK(KERN_DEBUG "write_data %c\n",data);
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/* Triggers also /STROBE. This behavior cannot be changed */
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ciaa.prb = data;
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mb();
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}
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static unsigned char amiga_read_data(struct parport *p)
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{
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/* Triggers also /STROBE. This behavior cannot be changed */
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return ciaa.prb;
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}
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static unsigned char control_amiga_to_pc(unsigned char control)
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{
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return PARPORT_CONTROL_SELECT |
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PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
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/* fake value: interrupt enable, select in, no reset,
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no autolf, no strobe - seems to be closest the wiring diagram */
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}
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static void amiga_write_control(struct parport *p, unsigned char control)
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{
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DPRINTK(KERN_DEBUG "write_control %02x\n",control);
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/* No implementation possible */
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}
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static unsigned char amiga_read_control( struct parport *p)
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{
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DPRINTK(KERN_DEBUG "read_control \n");
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return control_amiga_to_pc(0);
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}
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static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
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{
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unsigned char old;
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DPRINTK(KERN_DEBUG "frob_control mask %02x, value %02x\n",mask,val);
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old = amiga_read_control(p);
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amiga_write_control(p, (old & ~mask) ^ val);
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return old;
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}
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static unsigned char status_amiga_to_pc(unsigned char status)
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{
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unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
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if (status & 1) /* Busy */
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ret &= ~PARPORT_STATUS_BUSY;
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if (status & 2) /* PaperOut */
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ret |= PARPORT_STATUS_PAPEROUT;
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if (status & 4) /* Selected */
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ret |= PARPORT_STATUS_SELECT;
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/* the rest is not connected or handled autonomously in hardware */
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return ret;
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}
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static unsigned char amiga_read_status(struct parport *p)
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{
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unsigned char status;
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status = status_amiga_to_pc(ciab.pra & 7);
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DPRINTK(KERN_DEBUG "read_status %02x\n", status);
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return status;
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}
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static void amiga_enable_irq(struct parport *p)
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{
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enable_irq(IRQ_AMIGA_CIAA_FLG);
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}
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static void amiga_disable_irq(struct parport *p)
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{
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disable_irq(IRQ_AMIGA_CIAA_FLG);
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}
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static void amiga_data_forward(struct parport *p)
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{
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DPRINTK(KERN_DEBUG "forward\n");
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ciaa.ddrb = 0xff; /* all pins output */
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mb();
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}
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static void amiga_data_reverse(struct parport *p)
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{
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DPRINTK(KERN_DEBUG "reverse\n");
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ciaa.ddrb = 0; /* all pins input */
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mb();
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}
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static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
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{
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s->u.amiga.data = 0;
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s->u.amiga.datadir = 255;
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s->u.amiga.status = 0;
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s->u.amiga.statusdir = 0;
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}
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static void amiga_save_state(struct parport *p, struct parport_state *s)
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{
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mb();
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s->u.amiga.data = ciaa.prb;
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s->u.amiga.datadir = ciaa.ddrb;
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s->u.amiga.status = ciab.pra & 7;
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s->u.amiga.statusdir = ciab.ddra & 7;
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mb();
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}
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static void amiga_restore_state(struct parport *p, struct parport_state *s)
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{
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mb();
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ciaa.prb = s->u.amiga.data;
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ciaa.ddrb = s->u.amiga.datadir;
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ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
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ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
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mb();
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}
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static struct parport_operations pp_amiga_ops = {
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.write_data = amiga_write_data,
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.read_data = amiga_read_data,
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.write_control = amiga_write_control,
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.read_control = amiga_read_control,
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.frob_control = amiga_frob_control,
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.read_status = amiga_read_status,
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.enable_irq = amiga_enable_irq,
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.disable_irq = amiga_disable_irq,
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.data_forward = amiga_data_forward,
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.data_reverse = amiga_data_reverse,
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.init_state = amiga_init_state,
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.save_state = amiga_save_state,
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.restore_state = amiga_restore_state,
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.epp_write_data = parport_ieee1284_epp_write_data,
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.epp_read_data = parport_ieee1284_epp_read_data,
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.epp_write_addr = parport_ieee1284_epp_write_addr,
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.epp_read_addr = parport_ieee1284_epp_read_addr,
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.ecp_write_data = parport_ieee1284_ecp_write_data,
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.ecp_read_data = parport_ieee1284_ecp_read_data,
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.ecp_write_addr = parport_ieee1284_ecp_write_addr,
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.compat_write_data = parport_ieee1284_write_compat,
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.nibble_read_data = parport_ieee1284_read_nibble,
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.byte_read_data = parport_ieee1284_read_byte,
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.owner = THIS_MODULE,
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};
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/* ----------- Initialisation code --------------------------------- */
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static int __init amiga_parallel_probe(struct platform_device *pdev)
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{
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struct parport *p;
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int err;
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ciaa.ddrb = 0xff;
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ciab.ddra &= 0xf8;
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mb();
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p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
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PARPORT_DMA_NONE, &pp_amiga_ops);
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if (!p)
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return -EBUSY;
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err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
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p);
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if (err)
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goto out_irq;
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printk(KERN_INFO "%s: Amiga built-in port using irq\n", p->name);
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/* XXX: set operating mode */
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parport_announce_port(p);
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platform_set_drvdata(pdev, p);
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return 0;
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out_irq:
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parport_put_port(p);
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return err;
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}
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static int __exit amiga_parallel_remove(struct platform_device *pdev)
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{
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struct parport *port = platform_get_drvdata(pdev);
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parport_remove_port(port);
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if (port->irq != PARPORT_IRQ_NONE)
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free_irq(IRQ_AMIGA_CIAA_FLG, port);
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parport_put_port(port);
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return 0;
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}
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static struct platform_driver amiga_parallel_driver = {
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.remove = __exit_p(amiga_parallel_remove),
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.driver = {
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.name = "amiga-parallel",
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},
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};
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module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
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MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
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MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
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MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:amiga-parallel");
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