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245 lines
6.1 KiB
245 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Low-level parallel port routines for the Amiga built-in port |
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* |
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* Author: Joerg Dorchain <[email protected]> |
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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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static void amiga_write_data(struct parport *p, unsigned char data) |
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{ |
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pr_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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pr_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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pr_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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pr_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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pr_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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pr_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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pr_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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pr_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 <[email protected]>"); |
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MODULE_DESCRIPTION("Parport Driver for Amiga builtin Port"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:amiga-parallel");
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