223 lines
6.1 KiB
C
223 lines
6.1 KiB
C
/*
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* Low-level parallel-support for PC-style hardware integrated in the
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* LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
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*
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* (C) 1999-2001 by Helge Deller <deller@gmx.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* based on parport_pc.c by
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* Grant Guenther <grant@torque.net>
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* Phil Blundell <Philip.Blundell@pobox.com>
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* Tim Waugh <tim@cyberelk.demon.co.uk>
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* Jose Renau <renau@acm.org>
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* David Campbell
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* Andrea Arcangeli
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*/
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#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
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#define __DRIVERS_PARPORT_PARPORT_GSC_H
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#include <asm/io.h>
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#include <linux/delay.h>
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#undef DEBUG_PARPORT /* undefine for production */
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#define DELAY_TIME 0
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#if DELAY_TIME == 0
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#define parport_readb gsc_readb
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#define parport_writeb gsc_writeb
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#else
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static __inline__ unsigned char parport_readb( unsigned long port )
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{
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udelay(DELAY_TIME);
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return gsc_readb(port);
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}
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static __inline__ void parport_writeb( unsigned char value, unsigned long port )
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{
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gsc_writeb(value,port);
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udelay(DELAY_TIME);
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}
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#endif
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/* --- register definitions ------------------------------- */
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#define EPPDATA(p) ((p)->base + 0x4)
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#define EPPADDR(p) ((p)->base + 0x3)
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#define CONTROL(p) ((p)->base + 0x2)
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#define STATUS(p) ((p)->base + 0x1)
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#define DATA(p) ((p)->base + 0x0)
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struct parport_gsc_private {
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/* Contents of CTR. */
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unsigned char ctr;
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/* Bitmask of writable CTR bits. */
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unsigned char ctr_writable;
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/* Number of bytes per portword. */
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int pword;
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/* Not used yet. */
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int readIntrThreshold;
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int writeIntrThreshold;
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/* buffer suitable for DMA, if DMA enabled */
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char *dma_buf;
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dma_addr_t dma_handle;
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struct pci_dev *dev;
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};
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static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
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{
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#ifdef DEBUG_PARPORT
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printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
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#endif
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parport_writeb(d, DATA(p));
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}
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static inline unsigned char parport_gsc_read_data(struct parport *p)
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{
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unsigned char val = parport_readb (DATA (p));
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#ifdef DEBUG_PARPORT
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printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
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p, val);
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#endif
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return val;
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}
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/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
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* it doesn't do any extra masking. */
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static inline unsigned char __parport_gsc_frob_control(struct parport *p,
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unsigned char mask,
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unsigned char val)
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{
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struct parport_gsc_private *priv = p->physport->private_data;
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unsigned char ctr = priv->ctr;
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#ifdef DEBUG_PARPORT
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printk (KERN_DEBUG
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"__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
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mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
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#endif
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ctr = (ctr & ~mask) ^ val;
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ctr &= priv->ctr_writable; /* only write writable bits. */
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parport_writeb (ctr, CONTROL (p));
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priv->ctr = ctr; /* Update soft copy */
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return ctr;
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}
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static inline void parport_gsc_data_reverse(struct parport *p)
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{
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__parport_gsc_frob_control (p, 0x20, 0x20);
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}
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static inline void parport_gsc_data_forward(struct parport *p)
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{
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__parport_gsc_frob_control (p, 0x20, 0x00);
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}
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static inline void parport_gsc_write_control(struct parport *p,
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unsigned char d)
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{
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const unsigned char wm = (PARPORT_CONTROL_STROBE |
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PARPORT_CONTROL_AUTOFD |
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PARPORT_CONTROL_INIT |
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PARPORT_CONTROL_SELECT);
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/* Take this out when drivers have adapted to newer interface. */
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if (d & 0x20) {
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printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
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p->name, p->cad->name);
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parport_gsc_data_reverse (p);
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}
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__parport_gsc_frob_control (p, wm, d & wm);
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}
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static inline unsigned char parport_gsc_read_control(struct parport *p)
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{
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const unsigned char rm = (PARPORT_CONTROL_STROBE |
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PARPORT_CONTROL_AUTOFD |
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PARPORT_CONTROL_INIT |
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PARPORT_CONTROL_SELECT);
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const struct parport_gsc_private *priv = p->physport->private_data;
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return priv->ctr & rm; /* Use soft copy */
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}
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static inline unsigned char parport_gsc_frob_control(struct parport *p,
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unsigned char mask,
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unsigned char val)
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{
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const unsigned char wm = (PARPORT_CONTROL_STROBE |
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PARPORT_CONTROL_AUTOFD |
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PARPORT_CONTROL_INIT |
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PARPORT_CONTROL_SELECT);
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/* Take this out when drivers have adapted to newer interface. */
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if (mask & 0x20) {
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printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
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p->name, p->cad->name,
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(val & 0x20) ? "reverse" : "forward");
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if (val & 0x20)
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parport_gsc_data_reverse (p);
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else
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parport_gsc_data_forward (p);
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}
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/* Restrict mask and val to control lines. */
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mask &= wm;
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val &= wm;
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return __parport_gsc_frob_control (p, mask, val);
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}
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static inline unsigned char parport_gsc_read_status(struct parport *p)
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{
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return parport_readb (STATUS(p));
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}
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static inline void parport_gsc_disable_irq(struct parport *p)
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{
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__parport_gsc_frob_control (p, 0x10, 0x00);
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}
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static inline void parport_gsc_enable_irq(struct parport *p)
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{
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__parport_gsc_frob_control (p, 0x10, 0x10);
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}
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extern void parport_gsc_release_resources(struct parport *p);
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extern int parport_gsc_claim_resources(struct parport *p);
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extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
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extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
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extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
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extern void parport_gsc_inc_use_count(void);
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extern void parport_gsc_dec_use_count(void);
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extern struct parport *parport_gsc_probe_port(unsigned long base,
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unsigned long base_hi,
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int irq, int dma,
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struct parisc_device *padev);
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#endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */
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