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Release 4.14 drivers/parport/parport_mfc3.c

Directory: drivers/parport
/* Low-level parallel port routines for the Multiface 3 card
 *
 * Author: Joerg Dorchain <joerg@dorchain.net>
 *
 * (C) The elitist m68k Users(TM)
 *
 * based on the existing parport_amiga and lp_mfc
 *
 *
 * From the MFC3 documentation:
 * 
 * Miscellaneous PIA Details
 * -------------------------
 * 
 *      The two open-drain interrupt outputs /IRQA and /IRQB are routed to
 * /INT2 of the Z2 bus.
 * 
 *      The CPU data bus of the PIA (D0-D7) is connected to D8-D15 on the Z2
 * bus. This means that any PIA registers are accessed at even addresses.
 * 
 * Centronics Pin Connections for the PIA
 * --------------------------------------
 * 
 *      The following table shows the connections between the PIA and the
 * Centronics interface connector. These connections implement a single, but
 * very complete, Centronics type interface. The Pin column gives the pin
 * numbers of the PIA. The Centronics pin numbers can be found in the section
 * "Parallel Connectors".
 * 
 * 
 *    Pin | PIA | Dir | Centronics Names
 * -------+-----+-----+---------------------------------------------------------
 *     19 | CB2 | --> | /STROBE (aka /DRDY)
 *  10-17 | PBx | <-> | DATA0 - DATA7
 *     18 | CB1 | <-- | /ACK
 *     40 | CA1 | <-- | BUSY
 *      3 | PA1 | <-- | PAPER-OUT (aka POUT)
 *      4 | PA2 | <-- | SELECTED (aka SEL)
 *      9 | PA7 | --> | /INIT (aka /RESET or /INPUT-PRIME)
 *      6 | PA4 | <-- | /ERROR (aka /FAULT)
 *      7 | PA5 | --> | DIR (aka /SELECT-IN)
 *      8 | PA6 | --> | /AUTO-FEED-XT
 *     39 | CA2 | --> | open
 *      5 | PA3 | <-- | /ACK (same as CB1!)
 *      2 | PA0 | <-- | BUSY (same as CA1!)
 * -------+-----+-----+---------------------------------------------------------
 * 
 * Should be enough to understand some of the driver.
 *
 * Per convention for normal use the port registers are visible.
 * If you need the data direction registers, restore the value in the
 * control register.
 */

#include "multiface.h"
#include <linux/module.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <linux/delay.h>
#include <linux/mc6821.h>
#include <linux/zorro.h>
#include <linux/interrupt.h>
#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/irq.h>
#include <asm/amigaints.h>

/* Maximum Number of Cards supported */

#define MAX_MFC 5


#undef DEBUG
#ifdef DEBUG

#define DPRINTK printk
#else

static inline int DPRINTK(void *nothing, ...) {return 0;}

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#endif static struct parport *this_port[MAX_MFC] = {NULL, }; static volatile int dummy; /* for trigger readds */ #define pia(dev) ((struct pia *)(dev->base)) static struct parport_operations pp_mfc3_ops;
static void mfc3_write_data(struct parport *p, unsigned char data) { DPRINTK(KERN_DEBUG "write_data %c\n",data); dummy = pia(p)->pprb; /* clears irq bit */ /* Triggers also /STROBE.*/ pia(p)->pprb = data; }

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static unsigned char mfc3_read_data(struct parport *p) { /* clears interrupt bit. Triggers also /STROBE. */ return pia(p)->pprb; }

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static unsigned char control_pc_to_mfc3(unsigned char control) { unsigned char ret = 32|64; if (control & PARPORT_CONTROL_SELECT) /* XXX: What is SELECP? */ ret &= ~32; /* /SELECT_IN */ if (control & PARPORT_CONTROL_INIT) /* INITP */ ret |= 128; if (control & PARPORT_CONTROL_AUTOFD) /* AUTOLF */ ret &= ~64; if (control & PARPORT_CONTROL_STROBE) /* Strobe */ /* Handled directly by hardware */; return ret; }

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static unsigned char control_mfc3_to_pc(unsigned char control) { unsigned char ret = PARPORT_CONTROL_STROBE | PARPORT_CONTROL_AUTOFD | PARPORT_CONTROL_SELECT; if (control & 128) /* /INITP */ ret |= PARPORT_CONTROL_INIT; if (control & 64) /* /AUTOLF */ ret &= ~PARPORT_CONTROL_AUTOFD; if (control & 32) /* /SELECT_IN */ ret &= ~PARPORT_CONTROL_SELECT; return ret; }

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static void mfc3_write_control(struct parport *p, unsigned char control) { DPRINTK(KERN_DEBUG "write_control %02x\n",control); pia(p)->ppra = (pia(p)->ppra & 0x1f) | control_pc_to_mfc3(control); }

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static unsigned char mfc3_read_control( struct parport *p) { DPRINTK(KERN_DEBUG "read_control \n"); return control_mfc3_to_pc(pia(p)->ppra & 0xe0); }

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static unsigned char mfc3_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 = mfc3_read_control(p); mfc3_write_control(p, (old & ~mask) ^ val); return old; }

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static unsigned char status_mfc3_to_pc(unsigned char status) { unsigned char ret = PARPORT_STATUS_BUSY; if (status & 1) /* Busy */ ret &= ~PARPORT_STATUS_BUSY; if (status & 2) /* PaperOut */ ret |= PARPORT_STATUS_PAPEROUT; if (status & 4) /* Selected */ ret |= PARPORT_STATUS_SELECT; if (status & 8) /* Ack */ ret |= PARPORT_STATUS_ACK; if (status & 16) /* /ERROR */ ret |= PARPORT_STATUS_ERROR; return ret; }

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static unsigned char mfc3_read_status(struct parport *p) { unsigned char status; status = status_mfc3_to_pc(pia(p)->ppra & 0x1f); DPRINTK(KERN_DEBUG "read_status %02x\n", status); return status; }

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static int use_cnt;
static irqreturn_t mfc3_interrupt(int irq, void *dev_id) { int i; for( i = 0; i < MAX_MFC; i++) if (this_port[i] != NULL) if (pia(this_port[i])->crb & 128) { /* Board caused interrupt */ dummy = pia(this_port[i])->pprb; /* clear irq bit */ parport_generic_irq(this_port[i]); } return IRQ_HANDLED; }

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static void mfc3_enable_irq(struct parport *p) { pia(p)->crb |= PIA_C1_ENABLE_IRQ; }

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static void mfc3_disable_irq(struct parport *p) { pia(p)->crb &= ~PIA_C1_ENABLE_IRQ; }

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static void mfc3_data_forward(struct parport *p) { DPRINTK(KERN_DEBUG "forward\n"); pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ pia(p)->pddrb = 255; /* all pins output */ pia(p)->crb |= PIA_DDR; /* make data register visible - default */ }

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static void mfc3_data_reverse(struct parport *p) { DPRINTK(KERN_DEBUG "reverse\n"); pia(p)->crb &= ~PIA_DDR; /* make data direction register visible */ pia(p)->pddrb = 0; /* all pins input */ pia(p)->crb |= PIA_DDR; /* make data register visible - default */ }

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static void mfc3_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 = 0xe0; }

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static void mfc3_save_state(struct parport *p, struct parport_state *s) { s->u.amiga.data = pia(p)->pprb; pia(p)->crb &= ~PIA_DDR; s->u.amiga.datadir = pia(p)->pddrb; pia(p)->crb |= PIA_DDR; s->u.amiga.status = pia(p)->ppra; pia(p)->cra &= ~PIA_DDR; s->u.amiga.statusdir = pia(p)->pddrb; pia(p)->cra |= PIA_DDR; }

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static void mfc3_restore_state(struct parport *p, struct parport_state *s) { pia(p)->pprb = s->u.amiga.data; pia(p)->crb &= ~PIA_DDR; pia(p)->pddrb = s->u.amiga.datadir; pia(p)->crb |= PIA_DDR; pia(p)->ppra = s->u.amiga.status; pia(p)->cra &= ~PIA_DDR; pia(p)->pddrb = s->u.amiga.statusdir; pia(p)->cra |= PIA_DDR; }

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static struct parport_operations pp_mfc3_ops = { .write_data = mfc3_write_data, .read_data = mfc3_read_data, .write_control = mfc3_write_control, .read_control = mfc3_read_control, .frob_control = mfc3_frob_control, .read_status = mfc3_read_status, .enable_irq = mfc3_enable_irq, .disable_irq = mfc3_disable_irq, .data_forward = mfc3_data_forward, .data_reverse = mfc3_data_reverse, .init_state = mfc3_init_state, .save_state = mfc3_save_state, .restore_state = mfc3_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 parport_mfc3_init(void) { struct parport *p; int pias = 0; struct pia *pp; struct zorro_dev *z = NULL; if (!MACH_IS_AMIGA) return -ENODEV; while ((z = zorro_find_device(ZORRO_PROD_BSC_MULTIFACE_III, z))) { unsigned long piabase = z->resource.start+PIABASE; if (!request_mem_region(piabase, sizeof(struct pia), "PIA")) continue; pp = ZTWO_VADDR(piabase); pp->crb = 0; pp->pddrb = 255; /* all data pins output */ pp->crb = PIA_DDR|32|8; dummy = pp->pddrb; /* reading clears interrupt */ pp->cra = 0; pp->pddra = 0xe0; /* /RESET, /DIR ,/AUTO-FEED output */ pp->cra = PIA_DDR; pp->ppra = 0; /* reset printer */ udelay(10); pp->ppra = 128; p = parport_register_port((unsigned long)pp, IRQ_AMIGA_PORTS, PARPORT_DMA_NONE, &pp_mfc3_ops); if (!p) goto out_port; if (p->irq != PARPORT_IRQ_NONE) { if (use_cnt++ == 0) if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops)) goto out_irq; } p->dev = &z->dev; this_port[pias++] = p; printk(KERN_INFO "%s: Multiface III port using irq\n", p->name); /* XXX: set operating mode */ p->private_data = (void *)piabase; parport_announce_port (p); if (pias >= MAX_MFC) break; continue; out_irq: parport_put_port(p); out_port: release_mem_region(piabase, sizeof(struct pia)); } return pias ? 0 : -ENODEV; }

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static void __exit parport_mfc3_exit(void) { int i; for (i = 0; i < MAX_MFC; i++) { if (!this_port[i]) continue; parport_remove_port(this_port[i]); if (this_port[i]->irq != PARPORT_IRQ_NONE) { if (--use_cnt == 0) free_irq(IRQ_AMIGA_PORTS, &pp_mfc3_ops); } release_mem_region(ZTWO_PADDR(this_port[i]->private_data), sizeof(struct pia)); parport_put_port(this_port[i]); } }

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MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); MODULE_DESCRIPTION("Parport Driver for Multiface 3 expansion cards Parallel Port"); MODULE_SUPPORTED_DEVICE("Multiface 3 Parallel Port"); MODULE_LICENSE("GPL"); module_init(parport_mfc3_init) module_exit(parport_mfc3_exit)

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Thomas Gleixner10.06%15.56%
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Directory: drivers/parport
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