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/* 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
#ifdef DEBUG
#define DPRINTK printk
#else
#define DPRINTK(x...)	do { } while (0)
#endif


static void amiga_write_data(struct parport *p, unsigned char data)
{
	DPRINTK(KERN_DEBUG "write_data %c\n"
pan class="p">{ 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) { DPRINTK(KERN_DEBUG "write_control %02x\n",control); /* No implementation possible */ } static unsigned char amiga_read_control( struct parport *p) { DPRINTK(KERN_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; DPRINTK(KERN_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); DPRINTK(KERN_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) { DPRINTK(KERN_DEBUG "forward\n"); ciaa.ddrb = 0xff; /* all pins output */ mb(); } static void amiga_data_reverse(struct parport *p) { DPRINTK(KERN_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; printk(KERN_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");