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 char *dma_buf; 67 dma_addr_t dma_handle; 68 struct pci_dev *dev; 69 }; 70 71 static inline void parport_gsc_write_data(struct parport *p, unsigned char d) 72 { 73 #ifdef DEBUG_PARPORT 74 printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d); 75 #endif 76 parport_writeb(d, DATA(p)); 77 } 78 79 static inline unsigned char parport_gsc_read_data(struct parport *p) 80 { 81 unsigned char val = parport_readb (DATA (p)); 82 #ifdef DEBUG_PARPORT 83 printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n", 84 p, val); 85 #endif 86 return val; 87 } 88 89 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that 90 * it doesn't do any extra masking. */ 91 static inline unsigned char __parport_gsc_frob_control(struct parport *p, 92 unsigned char mask, 93 unsigned char val) 94 { 95 struct parport_gsc_private *priv = p->physport->private_data; 96 unsigned char ctr = priv->ctr; 97 #ifdef DEBUG_PARPORT 98 printk (KERN_DEBUG 99 "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n", 100 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable); 101 #endif 102 ctr = (ctr & ~mask) ^ val; 103 ctr &= priv->ctr_writable; /* only write writable bits. */ 104 parport_writeb (ctr, CONTROL (p)); 105 priv->ctr = ctr; /* Update soft copy */ 106 return ctr; 107 } 108 109 static inline void parport_gsc_data_reverse(struct parport *p) 110 { 111 __parport_gsc_frob_control (p, 0x20, 0x20); 112 } 113 114 static inline void parport_gsc_data_forward(struct parport *p) 115 { 116 __parport_gsc_frob_control (p, 0x20, 0x00); 117 } 118 119 static inline void parport_gsc_write_control(struct parport *p, 120 unsigned char d) 121 { 122 const unsigned char wm = (PARPORT_CONTROL_STROBE | 123 PARPORT_CONTROL_AUTOFD | 124 PARPORT_CONTROL_INIT | 125 PARPORT_CONTROL_SELECT); 126 127 /* Take this out when drivers have adapted to newer interface. */ 128 if (d & 0x20) { 129 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n", 130 p->name, p->cad->name); 131 parport_gsc_data_reverse (p); 132 } 133 134 __parport_gsc_frob_control (p, wm, d & wm); 135 } 136 137 static inline unsigned char parport_gsc_read_control(struct parport *p) 138 { 139 const unsigned char rm = (PARPORT_CONTROL_STROBE | 140 PARPORT_CONTROL_AUTOFD | 141 PARPORT_CONTROL_INIT | 142 PARPORT_CONTROL_SELECT); 143 const struct parport_gsc_private *priv = p->physport->private_data; 144 return priv->ctr & rm; /* Use soft copy */ 145 } 146 147 static inline unsigned char parport_gsc_frob_control(struct parport *p, 148 unsigned char mask, 149 unsigned char val) 150 { 151 const unsigned char wm = (PARPORT_CONTROL_STROBE | 152 PARPORT_CONTROL_AUTOFD | 153 PARPORT_CONTROL_INIT | 154 PARPORT_CONTROL_SELECT); 155 156 /* Take this out when drivers have adapted to newer interface. */ 157 if (mask & 0x20) { 158 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n", 159 p->name, p->cad->name, 160 (val & 0x20) ? "reverse" : "forward"); 161 if (val & 0x20) 162 parport_gsc_data_reverse (p); 163 else 164 parport_gsc_data_forward (p); 165 } 166 167 /* Restrict mask and val to control lines. */ 168 mask &= wm; 169 val &= wm; 170 171 return __parport_gsc_frob_control (p, mask, val); 172 } 173 174 static inline unsigned char parport_gsc_read_status(struct parport *p) 175 { 176 return parport_readb (STATUS(p)); 177 } 178 179 static inline void parport_gsc_disable_irq(struct parport *p) 180 { 181 __parport_gsc_frob_control (p, 0x10, 0x00); 182 } 183 184 static inline void parport_gsc_enable_irq(struct parport *p) 185 { 186 __parport_gsc_frob_control (p, 0x10, 0x10); 187 } 188 189 extern void parport_gsc_release_resources(struct parport *p); 190 191 extern int parport_gsc_claim_resources(struct parport *p); 192 193 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s); 194 195 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s); 196 197 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s); 198 199 extern void parport_gsc_inc_use_count(void); 200 201 extern void parport_gsc_dec_use_count(void); 202 203 extern struct parport *parport_gsc_probe_port(unsigned long base, 204 unsigned long base_hi, 205 int irq, int dma, 206 struct parisc_device *padev); 207 208 #endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */ 209