// SPDX-License-Identifier: GPL-2.0-only
|
/* Low-level parallel port routines for the Amiga built-in port
|
*
|
* Author: Joerg Dorchain <joerg@dorchain.net>
|
*
|
* This is a complete rewrite of the code, but based heaviy upon the old
|
* lp_intern. code.
|
*
|
* The built-in Amiga parallel port provides one port at a fixed address
|
* with 8 bidirectional data lines (D0 - D7) and 3 bidirectional status
|
* lines (BUSY, POUT, SEL), 1 output control line /STROBE (raised automatically
|
* in hardware when the data register is accessed), and 1 input control line
|
* /ACK, able to cause an interrupt, but both not directly settable by
|
* software.
|
*/
|
|
#include <linux/module.h>
|
#include <linux/init.h>
|
#include <linux/parport.h>
|
#include <linux/ioport.h>
|
#include <linux/interrupt.h>
|
#include <linux/platform_device.h>
|
|
#include <asm/setup.h>
|
#include <asm/amigahw.h>
|
#include <asm/irq.h>
|
#include <asm/io.h>
|
#include <asm/amigaints.h>
|
|
#undef DEBUG
|
|
static void amiga_write_data(struct parport *p, unsigned char data)
|
{
|
pr_debug("write_data %c\n", data);
|
/* Triggers also /STROBE. This behavior cannot be changed */
|
ciaa.prb = data;
|
mb();
|
}
|
|
static unsigned char amiga_read_data(struct parport *p)
|
{
|
/* Triggers also /STROBE. This behavior cannot be changed */
|
return ciaa.prb;
|
}
|
|
static unsigned char control_amiga_to_pc(unsigned char control)
|
{
|
return PARPORT_CONTROL_SELECT |
|
PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_STROBE;
|
/* fake value: interrupt enable, select in, no reset,
|
no autolf, no strobe - seems to be closest the wiring diagram */
|
}
|
|
static void amiga_write_control(struct parport *p, unsigned char control)
|
{
|
pr_debug("write_control %02x\n", control);
|
/* No implementation possible */
|
}
|
|
static unsigned char amiga_read_control( struct parport *p)
|
{
|
pr_debug("read_control\n");
|
return control_amiga_to_pc(0);
|
}
|
|
static unsigned char amiga_frob_control( struct parport *p, unsigned char mask, unsigned char val)
|
{
|
unsigned char old;
|
|
pr_debug("frob_control mask %02x, value %02x\n", mask, val);
|
old = amiga_read_control(p);
|
amiga_write_control(p, (old & ~mask) ^ val);
|
return old;
|
}
|
|
static unsigned char status_amiga_to_pc(unsigned char status)
|
{
|
unsigned char ret = PARPORT_STATUS_BUSY | PARPORT_STATUS_ACK | PARPORT_STATUS_ERROR;
|
|
if (status & 1) /* Busy */
|
ret &= ~PARPORT_STATUS_BUSY;
|
if (status & 2) /* PaperOut */
|
ret |= PARPORT_STATUS_PAPEROUT;
|
if (status & 4) /* Selected */
|
ret |= PARPORT_STATUS_SELECT;
|
/* the rest is not connected or handled autonomously in hardware */
|
|
return ret;
|
}
|
|
static unsigned char amiga_read_status(struct parport *p)
|
{
|
unsigned char status;
|
|
status = status_amiga_to_pc(ciab.pra & 7);
|
pr_debug("read_status %02x\n", status);
|
return status;
|
}
|
|
static void amiga_enable_irq(struct parport *p)
|
{
|
enable_irq(IRQ_AMIGA_CIAA_FLG);
|
}
|
|
static void amiga_disable_irq(struct parport *p)
|
{
|
disable_irq(IRQ_AMIGA_CIAA_FLG);
|
}
|
|
static void amiga_data_forward(struct parport *p)
|
{
|
pr_debug("forward\n");
|
ciaa.ddrb = 0xff; /* all pins output */
|
mb();
|
}
|
|
static void amiga_data_reverse(struct parport *p)
|
{
|
pr_debug("reverse\n");
|
ciaa.ddrb = 0; /* all pins input */
|
mb();
|
}
|
|
static void amiga_init_state(struct pardevice *dev, struct parport_state *s)
|
{
|
s->u.amiga.data = 0;
|
s->u.amiga.datadir = 255;
|
s->u.amiga.status = 0;
|
s->u.amiga.statusdir = 0;
|
}
|
|
static void amiga_save_state(struct parport *p, struct parport_state *s)
|
{
|
mb();
|
s->u.amiga.data = ciaa.prb;
|
s->u.amiga.datadir = ciaa.ddrb;
|
s->u.amiga.status = ciab.pra & 7;
|
s->u.amiga.statusdir = ciab.ddra & 7;
|
mb();
|
}
|
|
static void amiga_restore_state(struct parport *p, struct parport_state *s)
|
{
|
mb();
|
ciaa.prb = s->u.amiga.data;
|
ciaa.ddrb = s->u.amiga.datadir;
|
ciab.pra |= (ciab.pra & 0xf8) | s->u.amiga.status;
|
ciab.ddra |= (ciab.ddra & 0xf8) | s->u.amiga.statusdir;
|
mb();
|
}
|
|
static struct parport_operations pp_amiga_ops = {
|
.write_data = amiga_write_data,
|
.read_data = amiga_read_data,
|
|
.write_control = amiga_write_control,
|
.read_control = amiga_read_control,
|
.frob_control = amiga_frob_control,
|
|
.read_status = amiga_read_status,
|
|
.enable_irq = amiga_enable_irq,
|
.disable_irq = amiga_disable_irq,
|
|
.data_forward = amiga_data_forward,
|
.data_reverse = amiga_data_reverse,
|
|
.init_state = amiga_init_state,
|
.save_state = amiga_save_state,
|
.restore_state = amiga_restore_state,
|
|
.epp_write_data = parport_ieee1284_epp_write_data,
|
.epp_read_data = parport_ieee1284_epp_read_data,
|
.epp_write_addr = parport_ieee1284_epp_write_addr,
|
.epp_read_addr = parport_ieee1284_epp_read_addr,
|
|
.ecp_write_data = parport_ieee1284_ecp_write_data,
|
.ecp_read_data = parport_ieee1284_ecp_read_data,
|
.ecp_write_addr = parport_ieee1284_ecp_write_addr,
|
|
.compat_write_data = parport_ieee1284_write_compat,
|
.nibble_read_data = parport_ieee1284_read_nibble,
|
.byte_read_data = parport_ieee1284_read_byte,
|
|
.owner = THIS_MODULE,
|
};
|
|
/* ----------- Initialisation code --------------------------------- */
|
|
static int __init amiga_parallel_probe(struct platform_device *pdev)
|
{
|
struct parport *p;
|
int err;
|
|
ciaa.ddrb = 0xff;
|
ciab.ddra &= 0xf8;
|
mb();
|
|
p = parport_register_port((unsigned long)&ciaa.prb, IRQ_AMIGA_CIAA_FLG,
|
PARPORT_DMA_NONE, &pp_amiga_ops);
|
if (!p)
|
return -EBUSY;
|
|
err = request_irq(IRQ_AMIGA_CIAA_FLG, parport_irq_handler, 0, p->name,
|
p);
|
if (err)
|
goto out_irq;
|
|
pr_info("%s: Amiga built-in port using irq\n", p->name);
|
/* XXX: set operating mode */
|
parport_announce_port(p);
|
|
platform_set_drvdata(pdev, p);
|
|
return 0;
|
|
out_irq:
|
parport_put_port(p);
|
return err;
|
}
|
|
static int __exit amiga_parallel_remove(struct platform_device *pdev)
|
{
|
struct parport *port = platform_get_drvdata(pdev);
|
|
parport_remove_port(port);
|
if (port->irq != PARPORT_IRQ_NONE)
|
free_irq(IRQ_AMIGA_CIAA_FLG, port);
|
parport_put_port(port);
|
return 0;
|
}
|
|
static struct platform_driver amiga_parallel_driver = {
|
.remove = __exit_p(amiga_parallel_remove),
|
.driver = {
|
.name = "amiga-parallel",
|
},
|
};
|
|
module_platform_driver_probe(amiga_parallel_driver, amiga_parallel_probe);
|
|
MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>");
|
MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port");
|
MODULE_SUPPORTED_DEVICE("Amiga builtin Parallel Port");
|
MODULE_LICENSE("GPL");
|
MODULE_ALIAS("platform:amiga-parallel");
|
