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365 lines
9.7 KiB
365 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Low-level parallel port routines for the Multiface 3 card |
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* |
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* Author: Joerg Dorchain <[email protected]> |
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* |
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* (C) The elitist m68k Users(TM) |
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* |
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* based on the existing parport_amiga and lp_mfc |
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* |
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* |
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* From the MFC3 documentation: |
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* |
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* Miscellaneous PIA Details |
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* ------------------------- |
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* |
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* The two open-drain interrupt outputs /IRQA and /IRQB are routed to |
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* /INT2 of the Z2 bus. |
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* |
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* The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2 |
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* bus. This means that any PIA registers are accessed at even addresses. |
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* |
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* Centronics Pin Connections for the PIA |
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* -------------------------------------- |
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* |
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* The following table shows the connections between the PIA and the |
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* Centronics interface connector. These connections implement a single, but |
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* very complete, Centronics type interface. The Pin column gives the pin |
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* numbers of the PIA. The Centronics pin numbers can be found in the section |
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* "Parallel Connectors". |
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* |
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* |
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* Pin | PIA | Dir | Centronics Names |
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* -------+-----+-----+--------------------------------------------------------- |
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* 19 | CB2 | --> | /STROBE (aka /DRDY) |
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* 10-17 | PBx | <-> | DATA0 - DATA7 |
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* 18 | CB1 | <-- | /ACK |
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* 40 | CA1 | <-- | BUSY |
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* 3 | PA1 | <-- | PAPER-OUT (aka POUT) |
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* 4 | PA2 | <-- | SELECTED (aka SEL) |
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* 9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME) |
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* 6 | PA4 | <-- | /ERROR (aka /FAULT) |
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* 7 | PA5 | --> | DIR (aka /SELECT-IN) |
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* 8 | PA6 | --> | /AUTO-FEED-XT |
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* 39 | CA2 | --> | open |
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* 5 | PA3 | <-- | /ACK (same as CB1!) |
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* 2 | PA0 | <-- | BUSY (same as CA1!) |
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* -------+-----+-----+--------------------------------------------------------- |
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* |
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* Should be enough to understand some of the driver. |
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* |
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* Per convention for normal use the port registers are visible. |
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* If you need the data direction registers, restore the value in the |
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* control register. |
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*/ |
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#include "multiface.h" |
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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/delay.h> |
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#include <linux/mc6821.h> |
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#include <linux/zorro.h> |
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#include <linux/interrupt.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/amigaints.h> |
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/* Maximum Number of Cards supported */ |
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#define MAX_MFC 5 |
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#undef DEBUG |
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static struct parport *this_port[MAX_MFC] = {NULL, }; |
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static volatile int dummy; /* for trigger readds */ |
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#define pia(dev) ((struct pia *)(dev->base)) |
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static struct parport_operations pp_mfc3_ops; |
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static void mfc3_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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dummy = pia(p)->pprb; /* clears irq bit */ |
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/* Triggers also /STROBE.*/ |
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pia(p)->pprb = data; |
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} |
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static unsigned char mfc3_read_data(struct parport *p) |
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{ |
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/* clears interrupt bit. Triggers also /STROBE. */ |
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return pia(p)->pprb; |
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} |
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static unsigned char control_pc_to_mfc3(unsigned char control) |
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{ |
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unsigned char ret = 32|64; |
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if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ |
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ret &= ~32; /* /SELECT_IN */ |
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if (control & PARPORT_CONTROL_INIT) /* INITP */ |
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ret |= 128; |
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if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ |
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ret &= ~64; |
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if (control & PARPORT_CONTROL_STROBE) /* Strobe */ |
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/* Handled directly by hardware */; |
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return ret; |
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} |
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static unsigned char control_mfc3_to_pc(unsigned char control) |
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{ |
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unsigned char ret = PARPORT_CONTROL_STROBE |
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| PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT; |
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if (control & 128) /* /INITP */ |
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ret |= PARPORT_CONTROL_INIT; |
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if (control & 64) /* /AUTOLF */ |
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ret &= ~PARPORT_CONTROL_AUTOFD; |
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if (control & 32) /* /SELECT_IN */ |
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ret &= ~PARPORT_CONTROL_SELECT; |
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return ret; |
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} |
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static void mfc3_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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pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control); |
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} |
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static unsigned char mfc3_read_control( struct parport *p) |
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{ |
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pr_debug("read_control\n"); |
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return control_mfc3_to_pc(pia(p)->ppra & 0xe0); |
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} |
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static unsigned char mfc3_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 = mfc3_read_control(p); |
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mfc3_write_control(p, (old & ~mask) ^ val); |
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return old; |
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} |
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static unsigned char status_mfc3_to_pc(unsigned char status) |
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{ |
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unsigned char ret = PARPORT_STATUS_BUSY; |
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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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if (status & 8) /* Ack */ |
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ret |= PARPORT_STATUS_ACK; |
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if (status & 16) /* /ERROR */ |
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ret |= PARPORT_STATUS_ERROR; |
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return ret; |
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} |
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static unsigned char mfc3_read_status(struct parport *p) |
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{ |
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unsigned char status; |
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status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); |
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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 int use_cnt; |
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static irqreturn_t mfc3_interrupt(int irq, void *dev_id) |
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{ |
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int i; |
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for( i = 0; i < MAX_MFC; i++) |
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if (this_port[i] != NULL) |
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if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ |
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dummy = pia(this_port[i])->pprb; /* clear irq bit */ |
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parport_generic_irq(this_port[i]); |
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} |
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return IRQ_HANDLED; |
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} |
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static void mfc3_enable_irq(struct parport *p) |
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{ |
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pia(p)->crb |= PIA_C1_ENABLE_IRQ; |
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} |
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static void mfc3_disable_irq(struct parport *p) |
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{ |
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pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; |
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} |
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static void mfc3_data_forward(struct parport *p) |
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{ |
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pr_debug("forward\n"); |
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pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ |
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pia(p)->pddrb = 255; /* all pins output */ |
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pia(p)->crb |= PIA_DDR; /* make data register visible - default */ |
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} |
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static void mfc3_data_reverse(struct parport *p) |
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{ |
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pr_debug("reverse\n"); |
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pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ |
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pia(p)->pddrb = 0; /* all pins input */ |
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pia(p)->crb |= PIA_DDR; /* make data register visible - default */ |
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} |
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static void mfc3_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 = 0xe0; |
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} |
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static void mfc3_save_state(struct parport *p, struct parport_state *s) |
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{ |
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s->u.amiga.data = pia(p)->pprb; |
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pia(p)->crb &= ~PIA_DDR; |
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s->u.amiga.datadir = pia(p)->pddrb; |
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pia(p)->crb |= PIA_DDR; |
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s->u.amiga.status = pia(p)->ppra; |
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pia(p)->cra &= ~PIA_DDR; |
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s->u.amiga.statusdir = pia(p)->pddrb; |
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pia(p)->cra |= PIA_DDR; |
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} |
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static void mfc3_restore_state(struct parport *p, struct parport_state *s) |
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{ |
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pia(p)->pprb = s->u.amiga.data; |
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pia(p)->crb &= ~PIA_DDR; |
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pia(p)->pddrb = s->u.amiga.datadir; |
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pia(p)->crb |= PIA_DDR; |
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pia(p)->ppra = s->u.amiga.status; |
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pia(p)->cra &= ~PIA_DDR; |
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pia(p)->pddrb = s->u.amiga.statusdir; |
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pia(p)->cra |= PIA_DDR; |
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} |
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static struct parport_operations pp_mfc3_ops = { |
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.write_data = mfc3_write_data, |
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.read_data = mfc3_read_data, |
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.write_control = mfc3_write_control, |
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.read_control = mfc3_read_control, |
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.frob_control = mfc3_frob_control, |
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.read_status = mfc3_read_status, |
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.enable_irq = mfc3_enable_irq, |
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.disable_irq = mfc3_disable_irq, |
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.data_forward = mfc3_data_forward, |
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.data_reverse = mfc3_data_reverse, |
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.init_state = mfc3_init_state, |
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.save_state = mfc3_save_state, |
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.restore_state = mfc3_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 parport_mfc3_init(void) |
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{ |
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struct parport *p; |
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int pias = 0; |
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struct pia *pp; |
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struct zorro_dev *z = NULL; |
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if (!MACH_IS_AMIGA) |
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return -ENODEV; |
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while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { |
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unsigned long piabase = z->resource.start+PIABASE; |
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if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) |
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continue; |
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pp = ZTWO_VADDR(piabase); |
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pp->crb = 0; |
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pp->pddrb = 255; /* all data pins output */ |
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pp->crb = PIA_DDR|32|8; |
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dummy = pp->pddrb; /* reading clears interrupt */ |
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pp->cra = 0; |
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pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ |
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pp->cra = PIA_DDR; |
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pp->ppra = 0; /* reset printer */ |
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udelay(10); |
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pp->ppra = 128; |
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p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, |
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PARPORT_DMA_NONE, &pp_mfc3_ops); |
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if (!p) |
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goto out_port; |
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if (p->irq != PARPORT_IRQ_NONE) { |
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if (use_cnt++ == 0) |
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if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops)) |
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goto out_irq; |
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} |
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p->dev = &z->dev; |
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this_port[pias++] = p; |
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pr_info("%s: Multiface III port using irq\n", p->name); |
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/* XXX: set operating mode */ |
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p->private_data = (void *)piabase; |
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parport_announce_port (p); |
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if (pias >= MAX_MFC) |
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break; |
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continue; |
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out_irq: |
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parport_put_port(p); |
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out_port: |
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release_mem_region(piabase, sizeof(struct pia)); |
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} |
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return pias ? 0 : -ENODEV; |
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} |
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static void __exit parport_mfc3_exit(void) |
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{ |
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int i; |
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for (i = 0; i < MAX_MFC; i++) { |
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if (!this_port[i]) |
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continue; |
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parport_remove_port(this_port[i]); |
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if (this_port[i]->irq != PARPORT_IRQ_NONE) { |
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if (--use_cnt == 0) |
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free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); |
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} |
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release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); |
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parport_put_port(this_port[i]); |
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} |
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} |
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MODULE_AUTHOR("Joerg Dorchain <[email protected]>"); |
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MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port"); |
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MODULE_LICENSE("GPL"); |
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module_init(parport_mfc3_init) |
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module_exit(parport_mfc3_exit)
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