1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Low-level parallel-support for PC-style hardware integrated in the 4 * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations 5 * 6 * (C) 1999-2001 by Helge Deller <deller@gmx.de> 7 * 8 * based on parport_pc.c by 9 * 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 Campbell 14 * Andrea Arcangeli 15 */ 16 17 #ifndef __DRIVERS_PARPORT_PARPORT_GSC_H 18 #define __DRIVERS_PARPORT_PARPORT_GSC_H 19 20 #include <asm/io.h> 21 #include <linux/delay.h> 22 23 #undef DEBUG_PARPORT /* undefine for production */ 24 #define DELAY_TIME 0 25 26 #if DELAY_TIME == 0 27 #define parport_readb gsc_readb 28 #define parport_writeb gsc_writeb 29 #else 30 static __inline__ unsigned char parport_readb( unsigned long port ) 31 { 32 udelay(DELAY_TIME); 33 return gsc_readb(port); 34 } 35 36 static __inline__ void parport_writeb( unsigned char value, unsigned long port ) 37 { 38 gsc_writeb(value,port); 39 udelay(DELAY_TIME); 40 } 41 #endif 42 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 51 struct 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 69 static inline void parport_gsc_write_data(struct parport *p, unsigned char d) 70 { 71 #ifdef DEBUG_PARPORT 72 printk(KERN_DEBUG "%s(%p,0x%02x)\n", __func__, p, d); 73 #endif 74 parport_writeb(d, DATA(p)); 75 } 76 77 static inline unsigned char parport_gsc_read_data(struct parport *p) 78 { 79 unsigned char val = parport_readb (DATA (p)); 80 #ifdef DEBUG_PARPORT 81 printk(KERN_DEBUG "%s(%p) = 0x%02x\n", __func__, p, val); 82 #endif 83 return val; 84 } 85 86 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that 87 * it doesn't do any extra masking. */ 88 static 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_PARPORT 95 printk(KERN_DEBUG "%s(%02x,%02x): %02x -> %02x\n", 96 __func__, mask, val, 97 ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable); 98 #endif 99 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 } 105 106 static inline void parport_gsc_data_reverse(struct parport *p) 107 { 108 __parport_gsc_frob_control (p, 0x20, 0x20); 109 } 110 111 static inline void parport_gsc_data_forward(struct parport *p) 112 { 113 __parport_gsc_frob_control (p, 0x20, 0x00); 114 } 115 116 static 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 } 133 134 static 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 } 143 144 static 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 else 161 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 } 170 171 static inline unsigned char parport_gsc_read_status(struct parport *p) 172 { 173 return parport_readb (STATUS(p)); 174 } 175 176 static inline void parport_gsc_disable_irq(struct parport *p) 177 { 178 __parport_gsc_frob_control (p, 0x10, 0x00); 179 } 180 181 static inline void parport_gsc_enable_irq(struct parport *p) 182 { 183 __parport_gsc_frob_control (p, 0x10, 0x10); 184 } 185 186 extern void parport_gsc_release_resources(struct parport *p); 187 188 extern int parport_gsc_claim_resources(struct parport *p); 189 190 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s); 191 192 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s); 193 194 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s); 195 196 extern void parport_gsc_inc_use_count(void); 197 198 extern void parport_gsc_dec_use_count(void); 199 200 #endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */ 201