201 lines · c
1/* SPDX-License-Identifier: GPL-2.0-or-later */2/*3 * Low-level parallel-support for PC-style hardware integrated in the4 * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations5 *6 * (C) 1999-2001 by Helge Deller <deller@gmx.de>7 *8 * based on parport_pc.c by9 * Grant Guenther <grant@torque.net>10 * Phil Blundell <Philip.Blundell@pobox.com>11 * Tim Waugh <tim@cyberelk.demon.co.uk>12 * Jose Renau <renau@acm.org>13 * David Campbell14 * Andrea Arcangeli15 */16 17#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H18#define __DRIVERS_PARPORT_PARPORT_GSC_H19 20#include <asm/io.h>21#include <linux/delay.h>22 23#undef DEBUG_PARPORT /* undefine for production */24#define DELAY_TIME 025 26#if DELAY_TIME == 027#define parport_readb gsc_readb28#define parport_writeb gsc_writeb29#else30static __inline__ unsigned char parport_readb( unsigned long port )31{32 udelay(DELAY_TIME);33 return gsc_readb(port);34}35 36static __inline__ void parport_writeb( unsigned char value, unsigned long port )37{38 gsc_writeb(value,port);39 udelay(DELAY_TIME);40}41#endif42 43/* --- register definitions ------------------------------- */44 45#define EPPDATA(p) ((p)->base + 0x4)46#define EPPADDR(p) ((p)->base + 0x3)47#define CONTROL(p) ((p)->base + 0x2)48#define STATUS(p) ((p)->base + 0x1)49#define DATA(p) ((p)->base + 0x0)50 51struct parport_gsc_private {52 /* Contents of CTR. */53 unsigned char ctr;54 55 /* Bitmask of writable CTR bits. */56 unsigned char ctr_writable;57 58 /* Number of bytes per portword. */59 int pword;60 61 /* Not used yet. */62 int readIntrThreshold;63 int writeIntrThreshold;64 65 /* buffer suitable for DMA, if DMA enabled */66 struct pci_dev *dev;67};68 69static inline void parport_gsc_write_data(struct parport *p, unsigned char d)70{71#ifdef DEBUG_PARPORT72 printk(KERN_DEBUG "%s(%p,0x%02x)\n", __func__, p, d);73#endif74 parport_writeb(d, DATA(p));75}76 77static inline unsigned char parport_gsc_read_data(struct parport *p)78{79 unsigned char val = parport_readb (DATA (p));80#ifdef DEBUG_PARPORT81 printk(KERN_DEBUG "%s(%p) = 0x%02x\n", __func__, p, val);82#endif83 return val;84}85 86/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that87 * it doesn't do any extra masking. */88static inline unsigned char __parport_gsc_frob_control(struct parport *p,89 unsigned char mask,90 unsigned char val)91{92 struct parport_gsc_private *priv = p->physport->private_data;93 unsigned char ctr = priv->ctr;94#ifdef DEBUG_PARPORT95 printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n",96 __func__, mask, val,97 ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);98#endif99 ctr = (ctr & ~mask) ^ val;100 ctr &= priv->ctr_writable; /* only write writable bits. */101 parport_writeb (ctr, CONTROL (p));102 priv->ctr = ctr; /* Update soft copy */103 return ctr;104}105 106static inline void parport_gsc_data_reverse(struct parport *p)107{108 __parport_gsc_frob_control (p, 0x20, 0x20);109}110 111static inline void parport_gsc_data_forward(struct parport *p)112{113 __parport_gsc_frob_control (p, 0x20, 0x00);114}115 116static inline void parport_gsc_write_control(struct parport *p,117 unsigned char d)118{119 const unsigned char wm = (PARPORT_CONTROL_STROBE |120 PARPORT_CONTROL_AUTOFD |121 PARPORT_CONTROL_INIT |122 PARPORT_CONTROL_SELECT);123 124 /* Take this out when drivers have adapted to newer interface. */125 if (d & 0x20) {126 printk(KERN_DEBUG "%s (%s): use data_reverse for this!\n",127 p->name, p->cad->name);128 parport_gsc_data_reverse (p);129 }130 131 __parport_gsc_frob_control (p, wm, d & wm);132}133 134static inline unsigned char parport_gsc_read_control(struct parport *p)135{136 const unsigned char rm = (PARPORT_CONTROL_STROBE |137 PARPORT_CONTROL_AUTOFD |138 PARPORT_CONTROL_INIT |139 PARPORT_CONTROL_SELECT);140 const struct parport_gsc_private *priv = p->physport->private_data;141 return priv->ctr & rm; /* Use soft copy */142}143 144static inline unsigned char parport_gsc_frob_control(struct parport *p,145 unsigned char mask,146 unsigned char val)147{148 const unsigned char wm = (PARPORT_CONTROL_STROBE |149 PARPORT_CONTROL_AUTOFD |150 PARPORT_CONTROL_INIT |151 PARPORT_CONTROL_SELECT);152 153 /* Take this out when drivers have adapted to newer interface. */154 if (mask & 0x20) {155 printk(KERN_DEBUG "%s (%s): use data_%s for this!\n",156 p->name, p->cad->name,157 (val & 0x20) ? "reverse" : "forward");158 if (val & 0x20)159 parport_gsc_data_reverse (p);160 else161 parport_gsc_data_forward (p);162 }163 164 /* Restrict mask and val to control lines. */165 mask &= wm;166 val &= wm;167 168 return __parport_gsc_frob_control (p, mask, val);169}170 171static inline unsigned char parport_gsc_read_status(struct parport *p)172{173 return parport_readb (STATUS(p));174}175 176static inline void parport_gsc_disable_irq(struct parport *p)177{178 __parport_gsc_frob_control (p, 0x10, 0x00);179}180 181static inline void parport_gsc_enable_irq(struct parport *p)182{183 __parport_gsc_frob_control (p, 0x10, 0x10);184}185 186extern void parport_gsc_release_resources(struct parport *p);187 188extern int parport_gsc_claim_resources(struct parport *p);189 190extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);191 192extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);193 194extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);195 196extern void parport_gsc_inc_use_count(void);197 198extern void parport_gsc_dec_use_count(void);199 200#endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */201