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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Low-level parallel-support for PC-style hardware integrated in the
* LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
*
* (C) 1999-2001 by Helge Deller <deller@gmx.de>
*
* based on parport_pc.c by
* Grant Guenther <grant@torque.net>
* Phil Blundell <Philip.Blundell@pobox.com>
* Tim Waugh <tim@cyberelk.demon.co.uk>
* Jose Renau <renau@acm.org>
* David Campbell
* Andrea Arcangeli
*/
#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
#define __DRIVERS_PARPORT_PARPORT_GSC_H
#include <asm/io.h>
#include <linux/delay.h>
#undef DEBUG_PARPORT /* undefine for production */
#define DELAY_TIME 0
#if DELAY_TIME == 0
#define parport_readb gsc_readb
#define parport_writeb gsc_writeb
#else
static __inline__ unsigned char parport_readb( unsigned long port )
{
udelay(DELAY_TIME);
return gsc_readb(port);
}
static __inline__ void parport_writeb( unsigned char value, unsigned long port )
{
gsc_writeb(value,port);
udelay(DELAY_TIME);
}
#endif
/* --- register definitions ------------------------------- */
#define EPPDATA(p) ((p)->base + 0x4)
#define EPPADDR(p) ((p)->base + 0x3)
#define CONTROL(p) ((p)->base + 0x2)
#define STATUS(p) ((p)->base + 0x1)
#define DATA(p) ((p)->base + 0x0)
struct parport_gsc_private {
/* Contents of CTR. */
unsigned char ctr;
/* Bitmask of writable CTR bits. */
unsigned char ctr_writable;
/* Number of bytes per portword. */
int pword;
/* Not used yet. */
int readIntrThreshold;
int writeIntrThreshold;
/* buffer suitable for DMA, if DMA enabled */
char *dma_buf;
dma_addr_t dma_handle;
struct pci_dev *dev;
};
static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
{
#ifdef DEBUG_PARPORT
printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
#endif
parport_writeb(d, DATA(p));
}
static inline unsigned char parport_gsc_read_data(struct parport *p)
{
unsigned char val = parport_readb (DATA (p));
#ifdef DEBUG_PARPORT
printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
p, val);
#endif
return val;
}
/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
* it doesn't do any extra masking. */
static inline unsigned char __parport_gsc_frob_control(struct parport *p,
unsigned char mask,
unsigned char val)
{
struct parport_gsc_private *priv = p->physport->private_data;
unsigned char ctr = priv->ctr;
#ifdef DEBUG_PARPORT
printk (KERN_DEBUG
"__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
#endif
ctr = (ctr & ~mask) ^ val;
ctr &= priv->ctr_writable; /* only write writable bits. */
parport_writeb (ctr, CONTROL (p));
priv->ctr = ctr; /* Update soft copy */
return ctr;
}
static inline void parport_gsc_data_reverse(struct parport *p)
{
__parport_gsc_frob_control (p, 0x20, 0x20);
}
static inline void parport_gsc_data_forward(struct parport *p)
{
__parport_gsc_frob_control (p, 0x20, 0x00);
}
static inline void parport_gsc_write_control(struct parport *p,
unsigned char d)
{
const unsigned char wm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
/* Take this out when drivers have adapted to newer interface. */
if (d & 0x20) {
printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
p->name, p->cad->name);
parport_gsc_data_reverse (p);
}
__parport_gsc_frob_control (p, wm, d & wm);
}
static inline unsigned char parport_gsc_read_control(struct parport *p)
{
const unsigned char rm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
const struct parport_gsc_private *priv = p->physport->private_data;
return priv->ctr & rm; /* Use soft copy */
}
static inline unsigned char parport_gsc_frob_control(struct parport *p,
unsigned char mask,
unsigned char val)
{
const unsigned char wm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
/* Take this out when drivers have adapted to newer interface. */
if (mask & 0x20) {
printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
p->name, p->cad->name,
(val & 0x20) ? "reverse" : "forward");
if (val & 0x20)
parport_gsc_data_reverse (p);
else
parport_gsc_data_forward (p);
}
/* Restrict mask and val to control lines. */
mask &= wm;
val &= wm;
return __parport_gsc_frob_control (p, mask, val);
}
static inline unsigned char parport_gsc_read_status(struct parport *p)
{
return parport_readb (STATUS(p));
}
static inline void parport_gsc_disable_irq(struct parport *p)
{
__parport_gsc_frob_control (p, 0x10, 0x00);
}
static inline void parport_gsc_enable_irq(struct parport *p)
{
__parport_gsc_frob_control (p, 0x10, 0x10);
}
extern void parport_gsc_release_resources(struct parport *p);
extern int parport_gsc_claim_resources(struct parport *p);
extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
extern void parport_gsc_inc_use_count(void);
extern void parport_gsc_dec_use_count(void);
extern struct parport *parport_gsc_probe_port(unsigned long base,
unsigned long base_hi,
int irq, int dma,
struct parisc_device *padev);
#endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */
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