- 根目录:
- drivers
- parport
- parport_mfc3.c
/* 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;}
#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;
}
static unsigned char mfc3_read_data(struct parport *p)
{
/* clears interrupt bit. Triggers also /STROBE. */
return pia(p)->pprb;
}
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;
}
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;
}
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);
}
static unsigned char mfc3_read_control( struct parport *p)
{
DPRINTK(KERN_DEBUG "read_control \n");
return control_mfc3_to_pc(pia(p)->ppra & 0xe0);
}
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;
}
#if 0 /* currently unused */
static unsigned char status_pc_to_mfc3(unsigned char status)
{
unsigned char ret = 1;
if (status & PARPORT_STATUS_BUSY) /* Busy */
ret &= ~1;
if (status & PARPORT_STATUS_ACK) /* Ack */
ret |= 8;
if (status & PARPORT_STATUS_PAPEROUT) /* PaperOut */
ret |= 2;
if (status & PARPORT_STATUS_SELECT) /* select */
ret |= 4;
if (status & PARPORT_STATUS_ERROR) /* error */
ret |= 16;
return ret;
}
#endif
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;
}
#if 0 /* currently unused */
static void mfc3_write_status( struct parport *p, unsigned char status)
{
DPRINTK(KERN_DEBUG "write_status %02x\n",status);
pia(p)->ppra = (pia(p)->ppra & 0xe0) | status_pc_to_mfc3(status);
}
#endif
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;
}
#if 0 /* currently unused */
static void mfc3_change_mode( struct parport *p, int m)
{
/* XXX: This port only has one mode, and I am
not sure about the corresponding PC-style mode*/
}
#endif
static int use_cnt = 0;
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;
}
static void mfc3_enable_irq(struct parport *p)
{
pia(p)->crb |= PIA_C1_ENABLE_IRQ;
}
static void mfc3_disable_irq(struct parport *p)
{
pia(p)->crb &= ~PIA_C1_ENABLE_IRQ;
}
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 */
}
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 */
}
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;
}
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;
}
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;
}
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 = (struct pia *)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;
}
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]);
}
}
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)