1 /* 2 * Low-level parallel-support for PC-style hardware integrated in the 3 * LASI-Controller (on GSC-Bus) for HP-PARISC Workstations 4 * 5 * (C) 1999-2001 by Helge Deller <deller@gmx.de> 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 * 22 * based on parport_pc.c by 23 * Grant Guenther <grant@torque.net> 24 * Phil Blundell <Philip.Blundell@pobox.com> 25 * Tim Waugh <tim@cyberelk.demon.co.uk> 26 * Jose Renau <renau@acm.org> 27 * David Campbell 28 * Andrea Arcangeli 29 */ 30 31 #ifndef __DRIVERS_PARPORT_PARPORT_GSC_H 32 #define __DRIVERS_PARPORT_PARPORT_GSC_H 33 34 #include <asm/io.h> 35 #include <linux/delay.h> 36 37 #undef DEBUG_PARPORT /* undefine for production */ 38 #define DELAY_TIME 0 39 40 #if DELAY_TIME == 0 41 #define parport_readb gsc_readb 42 #define parport_writeb gsc_writeb 43 #else 44 static __inline__ unsigned char parport_readb( unsigned long port ) 45 { 46 udelay(DELAY_TIME); 47 return gsc_readb(port); 48 } 49 50 static __inline__ void parport_writeb( unsigned char value, unsigned long port ) 51 { 52 gsc_writeb(value,port); 53 udelay(DELAY_TIME); 54 } 55 #endif 56 57 /* --- register definitions ------------------------------- */ 58 59 #define EPPDATA(p) ((p)->base + 0x4) 60 #define EPPADDR(p) ((p)->base + 0x3) 61 #define CONTROL(p) ((p)->base + 0x2) 62 #define STATUS(p) ((p)->base + 0x1) 63 #define DATA(p) ((p)->base + 0x0) 64 65 struct parport_gsc_private { 66 /* Contents of CTR. */ 67 unsigned char ctr; 68 69 /* Bitmask of writable CTR bits. */ 70 unsigned char ctr_writable; 71 72 /* Number of bytes per portword. */ 73 int pword; 74 75 /* Not used yet. */ 76 int readIntrThreshold; 77 int writeIntrThreshold; 78 79 /* buffer suitable for DMA, if DMA enabled */ 80 char *dma_buf; 81 dma_addr_t dma_handle; 82 struct pci_dev *dev; 83 }; 84 85 static inline void parport_gsc_write_data(struct parport *p, unsigned char d) 86 { 87 #ifdef DEBUG_PARPORT 88 printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d); 89 #endif 90 parport_writeb(d, DATA(p)); 91 } 92 93 static inline unsigned char parport_gsc_read_data(struct parport *p) 94 { 95 unsigned char val = parport_readb (DATA (p)); 96 #ifdef DEBUG_PARPORT 97 printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n", 98 p, val); 99 #endif 100 return val; 101 } 102 103 /* __parport_gsc_frob_control differs from parport_gsc_frob_control in that 104 * it doesn't do any extra masking. */ 105 static inline unsigned char __parport_gsc_frob_control(struct parport *p, 106 unsigned char mask, 107 unsigned char val) 108 { 109 struct parport_gsc_private *priv = p->physport->private_data; 110 unsigned char ctr = priv->ctr; 111 #ifdef DEBUG_PARPORT 112 printk (KERN_DEBUG 113 "__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n", 114 mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable); 115 #endif 116 ctr = (ctr & ~mask) ^ val; 117 ctr &= priv->ctr_writable; /* only write writable bits. */ 118 parport_writeb (ctr, CONTROL (p)); 119 priv->ctr = ctr; /* Update soft copy */ 120 return ctr; 121 } 122 123 static inline void parport_gsc_data_reverse(struct parport *p) 124 { 125 __parport_gsc_frob_control (p, 0x20, 0x20); 126 } 127 128 static inline void parport_gsc_data_forward(struct parport *p) 129 { 130 __parport_gsc_frob_control (p, 0x20, 0x00); 131 } 132 133 static inline void parport_gsc_write_control(struct parport *p, 134 unsigned char d) 135 { 136 const unsigned char wm = (PARPORT_CONTROL_STROBE | 137 PARPORT_CONTROL_AUTOFD | 138 PARPORT_CONTROL_INIT | 139 PARPORT_CONTROL_SELECT); 140 141 /* Take this out when drivers have adapted to newer interface. */ 142 if (d & 0x20) { 143 printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n", 144 p->name, p->cad->name); 145 parport_gsc_data_reverse (p); 146 } 147 148 __parport_gsc_frob_control (p, wm, d & wm); 149 } 150 151 static inline unsigned char parport_gsc_read_control(struct parport *p) 152 { 153 const unsigned char rm = (PARPORT_CONTROL_STROBE | 154 PARPORT_CONTROL_AUTOFD | 155 PARPORT_CONTROL_INIT | 156 PARPORT_CONTROL_SELECT); 157 const struct parport_gsc_private *priv = p->physport->private_data; 158 return priv->ctr & rm; /* Use soft copy */ 159 } 160 161 static inline unsigned char parport_gsc_frob_control(struct parport *p, 162 unsigned char mask, 163 unsigned char val) 164 { 165 const unsigned char wm = (PARPORT_CONTROL_STROBE | 166 PARPORT_CONTROL_AUTOFD | 167 PARPORT_CONTROL_INIT | 168 PARPORT_CONTROL_SELECT); 169 170 /* Take this out when drivers have adapted to newer interface. */ 171 if (mask & 0x20) { 172 printk (KERN_DEBUG "%s (%s): use data_%s for this!\n", 173 p->name, p->cad->name, 174 (val & 0x20) ? "reverse" : "forward"); 175 if (val & 0x20) 176 parport_gsc_data_reverse (p); 177 else 178 parport_gsc_data_forward (p); 179 } 180 181 /* Restrict mask and val to control lines. */ 182 mask &= wm; 183 val &= wm; 184 185 return __parport_gsc_frob_control (p, mask, val); 186 } 187 188 static inline unsigned char parport_gsc_read_status(struct parport *p) 189 { 190 return parport_readb (STATUS(p)); 191 } 192 193 static inline void parport_gsc_disable_irq(struct parport *p) 194 { 195 __parport_gsc_frob_control (p, 0x10, 0x00); 196 } 197 198 static inline void parport_gsc_enable_irq(struct parport *p) 199 { 200 __parport_gsc_frob_control (p, 0x10, 0x10); 201 } 202 203 extern void parport_gsc_release_resources(struct parport *p); 204 205 extern int parport_gsc_claim_resources(struct parport *p); 206 207 extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s); 208 209 extern void parport_gsc_save_state(struct parport *p, struct parport_state *s); 210 211 extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s); 212 213 extern void parport_gsc_inc_use_count(void); 214 215 extern void parport_gsc_dec_use_count(void); 216 217 extern struct parport *parport_gsc_probe_port(unsigned long base, 218 unsigned long base_hi, 219 int irq, int dma, 220 struct parisc_device *padev); 221 222 #endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */ 223