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