406 lines
11 KiB
C
406 lines
11 KiB
C
/* Low-level parallel port routines for the Multiface 3 card
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*
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* Author: Joerg Dorchain <joerg@dorchain.net>
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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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#ifdef DEBUG
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#define DPRINTK printk
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#else
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static inline int DPRINTK(void *nothing, ...) {return 0;}
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#endif
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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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DPRINTK(KERN_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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DPRINTK(KERN_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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DPRINTK(KERN_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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DPRINTK(KERN_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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#if 0 /* currently unused */
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static unsigned char status_pc_to_mfc3(unsigned char status)
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{
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unsigned char ret = 1;
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if (status & PARPORT_STATUS_BUSY) /* Busy */
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ret &= ~1;
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if (status & PARPORT_STATUS_ACK) /* Ack */
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ret |= 8;
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if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
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ret |= 2;
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if (status & PARPORT_STATUS_SELECT) /* select */
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ret |= 4;
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if (status & PARPORT_STATUS_ERROR) /* error */
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ret |= 16;
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return ret;
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}
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#endif
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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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#if 0 /* currently unused */
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static void mfc3_write_status( struct parport *p, unsigned char status)
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{
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DPRINTK(KERN_DEBUG "write_status %02x\n",status);
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pia(p)->ppra = (pia(p)->ppra & 0xe0) | status_pc_to_mfc3(status);
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}
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#endif
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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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DPRINTK(KERN_DEBUG "read_status %02x\n", status);
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return status;
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}
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#if 0 /* currently unused */
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static void mfc3_change_mode( struct parport *p, int m)
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{
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/* XXX: This port only has one mode, and I am
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not sure about the corresponding PC-style mode*/
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}
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#endif
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static int use_cnt = 0;
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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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DPRINTK(KERN_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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DPRINTK(KERN_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 = (struct pia *)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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printk(KERN_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 <joerg@dorchain.net>");
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MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Paralllel Port");
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MODULE_SUPPORTED_DEVICE("Multiface 3 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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