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 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * (C) 1999-2001 by Helge Deller <deller@gmx.de> 11 * 12 * 13 * based on parport_pc.c by 14 * Grant Guenther <grant@torque.net> 15 * Phil Blundell <philb@gnu.org> 16 * Tim Waugh <tim@cyberelk.demon.co.uk> 17 * Jose Renau <renau@acm.org> 18 * David Campbell 19 * Andrea Arcangeli 20 */ 21 22 #undef DEBUG /* undef for production */ 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/delay.h> 27 #include <linux/errno.h> 28 #include <linux/interrupt.h> 29 #include <linux/ioport.h> 30 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/pci.h> 33 #include <linux/sysctl.h> 34 35 #include <asm/io.h> 36 #include <asm/dma.h> 37 #include <asm/uaccess.h> 38 #include <asm/superio.h> 39 40 #include <linux/parport.h> 41 #include <asm/pdc.h> 42 #include <asm/parisc-device.h> 43 #include <asm/hardware.h> 44 #include "parport_gsc.h" 45 46 47 MODULE_AUTHOR("Helge Deller <deller@gmx.de>"); 48 MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver"); 49 MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port"); 50 MODULE_LICENSE("GPL"); 51 52 53 /* 54 * Clear TIMEOUT BIT in EPP MODE 55 * 56 * This is also used in SPP detection. 57 */ 58 static int clear_epp_timeout(struct parport *pb) 59 { 60 unsigned char r; 61 62 if (!(parport_gsc_read_status(pb) & 0x01)) 63 return 1; 64 65 /* To clear timeout some chips require double read */ 66 parport_gsc_read_status(pb); 67 r = parport_gsc_read_status(pb); 68 parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */ 69 parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */ 70 r = parport_gsc_read_status(pb); 71 72 return !(r & 0x01); 73 } 74 75 /* 76 * Access functions. 77 * 78 * Most of these aren't static because they may be used by the 79 * parport_xxx_yyy macros. extern __inline__ versions of several 80 * of these are in parport_gsc.h. 81 */ 82 83 void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s) 84 { 85 s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0); 86 } 87 88 void parport_gsc_save_state(struct parport *p, struct parport_state *s) 89 { 90 s->u.pc.ctr = parport_readb (CONTROL (p)); 91 } 92 93 void parport_gsc_restore_state(struct parport *p, struct parport_state *s) 94 { 95 parport_writeb (s->u.pc.ctr, CONTROL (p)); 96 } 97 98 struct parport_operations parport_gsc_ops = 99 { 100 .write_data = parport_gsc_write_data, 101 .read_data = parport_gsc_read_data, 102 103 .write_control = parport_gsc_write_control, 104 .read_control = parport_gsc_read_control, 105 .frob_control = parport_gsc_frob_control, 106 107 .read_status = parport_gsc_read_status, 108 109 .enable_irq = parport_gsc_enable_irq, 110 .disable_irq = parport_gsc_disable_irq, 111 112 .data_forward = parport_gsc_data_forward, 113 .data_reverse = parport_gsc_data_reverse, 114 115 .init_state = parport_gsc_init_state, 116 .save_state = parport_gsc_save_state, 117 .restore_state = parport_gsc_restore_state, 118 119 .epp_write_data = parport_ieee1284_epp_write_data, 120 .epp_read_data = parport_ieee1284_epp_read_data, 121 .epp_write_addr = parport_ieee1284_epp_write_addr, 122 .epp_read_addr = parport_ieee1284_epp_read_addr, 123 124 .ecp_write_data = parport_ieee1284_ecp_write_data, 125 .ecp_read_data = parport_ieee1284_ecp_read_data, 126 .ecp_write_addr = parport_ieee1284_ecp_write_addr, 127 128 .compat_write_data = parport_ieee1284_write_compat, 129 .nibble_read_data = parport_ieee1284_read_nibble, 130 .byte_read_data = parport_ieee1284_read_byte, 131 132 .owner = THIS_MODULE, 133 }; 134 135 /* --- Mode detection ------------------------------------- */ 136 137 /* 138 * Checks for port existence, all ports support SPP MODE 139 */ 140 static int __devinit parport_SPP_supported(struct parport *pb) 141 { 142 unsigned char r, w; 143 144 /* 145 * first clear an eventually pending EPP timeout 146 * I (sailer@ife.ee.ethz.ch) have an SMSC chipset 147 * that does not even respond to SPP cycles if an EPP 148 * timeout is pending 149 */ 150 clear_epp_timeout(pb); 151 152 /* Do a simple read-write test to make sure the port exists. */ 153 w = 0xc; 154 parport_writeb (w, CONTROL (pb)); 155 156 /* Is there a control register that we can read from? Some 157 * ports don't allow reads, so read_control just returns a 158 * software copy. Some ports _do_ allow reads, so bypass the 159 * software copy here. In addition, some bits aren't 160 * writable. */ 161 r = parport_readb (CONTROL (pb)); 162 if ((r & 0xf) == w) { 163 w = 0xe; 164 parport_writeb (w, CONTROL (pb)); 165 r = parport_readb (CONTROL (pb)); 166 parport_writeb (0xc, CONTROL (pb)); 167 if ((r & 0xf) == w) 168 return PARPORT_MODE_PCSPP; 169 } 170 171 /* Try the data register. The data lines aren't tri-stated at 172 * this stage, so we expect back what we wrote. */ 173 w = 0xaa; 174 parport_gsc_write_data (pb, w); 175 r = parport_gsc_read_data (pb); 176 if (r == w) { 177 w = 0x55; 178 parport_gsc_write_data (pb, w); 179 r = parport_gsc_read_data (pb); 180 if (r == w) 181 return PARPORT_MODE_PCSPP; 182 } 183 184 return 0; 185 } 186 187 /* Detect PS/2 support. 188 * 189 * Bit 5 (0x20) sets the PS/2 data direction; setting this high 190 * allows us to read data from the data lines. In theory we would get back 191 * 0xff but any peripheral attached to the port may drag some or all of the 192 * lines down to zero. So if we get back anything that isn't the contents 193 * of the data register we deem PS/2 support to be present. 194 * 195 * Some SPP ports have "half PS/2" ability - you can't turn off the line 196 * drivers, but an external peripheral with sufficiently beefy drivers of 197 * its own can overpower them and assert its own levels onto the bus, from 198 * where they can then be read back as normal. Ports with this property 199 * and the right type of device attached are likely to fail the SPP test, 200 * (as they will appear to have stuck bits) and so the fact that they might 201 * be misdetected here is rather academic. 202 */ 203 204 static int __devinit parport_PS2_supported(struct parport *pb) 205 { 206 int ok = 0; 207 208 clear_epp_timeout(pb); 209 210 /* try to tri-state the buffer */ 211 parport_gsc_data_reverse (pb); 212 213 parport_gsc_write_data(pb, 0x55); 214 if (parport_gsc_read_data(pb) != 0x55) ok++; 215 216 parport_gsc_write_data(pb, 0xaa); 217 if (parport_gsc_read_data(pb) != 0xaa) ok++; 218 219 /* cancel input mode */ 220 parport_gsc_data_forward (pb); 221 222 if (ok) { 223 pb->modes |= PARPORT_MODE_TRISTATE; 224 } else { 225 struct parport_gsc_private *priv = pb->private_data; 226 priv->ctr_writable &= ~0x20; 227 } 228 229 return ok; 230 } 231 232 233 /* --- Initialisation code -------------------------------- */ 234 235 struct parport *__devinit parport_gsc_probe_port (unsigned long base, 236 unsigned long base_hi, 237 int irq, int dma, 238 struct pci_dev *dev) 239 { 240 struct parport_gsc_private *priv; 241 struct parport_operations *ops; 242 struct parport tmp; 243 struct parport *p = &tmp; 244 245 priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL); 246 if (!priv) { 247 printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base); 248 return NULL; 249 } 250 ops = kmalloc (sizeof (struct parport_operations), GFP_KERNEL); 251 if (!ops) { 252 printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n", 253 base); 254 kfree (priv); 255 return NULL; 256 } 257 memcpy (ops, &parport_gsc_ops, sizeof (struct parport_operations)); 258 priv->ctr = 0xc; 259 priv->ctr_writable = 0xff; 260 priv->dma_buf = 0; 261 priv->dma_handle = 0; 262 priv->dev = dev; 263 p->base = base; 264 p->base_hi = base_hi; 265 p->irq = irq; 266 p->dma = dma; 267 p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT; 268 p->ops = ops; 269 p->private_data = priv; 270 p->physport = p; 271 if (!parport_SPP_supported (p)) { 272 /* No port. */ 273 kfree (priv); 274 kfree(ops); 275 return NULL; 276 } 277 parport_PS2_supported (p); 278 279 if (!(p = parport_register_port(base, PARPORT_IRQ_NONE, 280 PARPORT_DMA_NONE, ops))) { 281 kfree (priv); 282 kfree (ops); 283 return NULL; 284 } 285 286 p->base_hi = base_hi; 287 p->modes = tmp.modes; 288 p->size = (p->modes & PARPORT_MODE_EPP)?8:3; 289 p->private_data = priv; 290 291 printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base); 292 p->irq = irq; 293 if (p->irq == PARPORT_IRQ_AUTO) { 294 p->irq = PARPORT_IRQ_NONE; 295 } 296 if (p->irq != PARPORT_IRQ_NONE) { 297 printk(", irq %d", p->irq); 298 299 if (p->dma == PARPORT_DMA_AUTO) { 300 p->dma = PARPORT_DMA_NONE; 301 } 302 } 303 if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq 304 is mandatory (see above) */ 305 p->dma = PARPORT_DMA_NONE; 306 307 printk(" ["); 308 #define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}} 309 { 310 int f = 0; 311 printmode(PCSPP); 312 printmode(TRISTATE); 313 printmode(COMPAT) 314 printmode(EPP); 315 // printmode(ECP); 316 // printmode(DMA); 317 } 318 #undef printmode 319 printk("]\n"); 320 321 if (p->irq != PARPORT_IRQ_NONE) { 322 if (request_irq (p->irq, parport_irq_handler, 323 0, p->name, p)) { 324 printk (KERN_WARNING "%s: irq %d in use, " 325 "resorting to polled operation\n", 326 p->name, p->irq); 327 p->irq = PARPORT_IRQ_NONE; 328 p->dma = PARPORT_DMA_NONE; 329 } 330 } 331 332 /* Done probing. Now put the port into a sensible start-up state. */ 333 334 parport_gsc_write_data(p, 0); 335 parport_gsc_data_forward (p); 336 337 /* Now that we've told the sharing engine about the port, and 338 found out its characteristics, let the high-level drivers 339 know about it. */ 340 parport_announce_port (p); 341 342 return p; 343 } 344 345 346 #define PARPORT_GSC_OFFSET 0x800 347 348 static int __devinitdata parport_count; 349 350 static int __devinit parport_init_chip(struct parisc_device *dev) 351 { 352 struct parport *p; 353 unsigned long port; 354 355 if (!dev->irq) { 356 printk(KERN_WARNING "IRQ not found for parallel device at 0x%llx\n", 357 (unsigned long long)dev->hpa.start); 358 return -ENODEV; 359 } 360 361 port = dev->hpa.start + PARPORT_GSC_OFFSET; 362 363 /* some older machines with ASP-chip don't support 364 * the enhanced parport modes. 365 */ 366 if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) { 367 368 /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */ 369 printk("%s: initialize bidirectional-mode.\n", __func__); 370 parport_writeb ( (0x10 + 0x20), port + 4); 371 372 } else { 373 printk("%s: enhanced parport-modes not supported.\n", __func__); 374 } 375 376 p = parport_gsc_probe_port(port, 0, dev->irq, 377 /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, NULL); 378 if (p) 379 parport_count++; 380 dev_set_drvdata(&dev->dev, p); 381 382 return 0; 383 } 384 385 static int __devexit parport_remove_chip(struct parisc_device *dev) 386 { 387 struct parport *p = dev_get_drvdata(&dev->dev); 388 if (p) { 389 struct parport_gsc_private *priv = p->private_data; 390 struct parport_operations *ops = p->ops; 391 parport_remove_port(p); 392 if (p->dma != PARPORT_DMA_NONE) 393 free_dma(p->dma); 394 if (p->irq != PARPORT_IRQ_NONE) 395 free_irq(p->irq, p); 396 if (priv->dma_buf) 397 pci_free_consistent(priv->dev, PAGE_SIZE, 398 priv->dma_buf, 399 priv->dma_handle); 400 kfree (p->private_data); 401 parport_put_port(p); 402 kfree (ops); /* hope no-one cached it */ 403 } 404 return 0; 405 } 406 407 static struct parisc_device_id parport_tbl[] = { 408 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 }, 409 { 0, } 410 }; 411 412 MODULE_DEVICE_TABLE(parisc, parport_tbl); 413 414 static struct parisc_driver parport_driver = { 415 .name = "Parallel", 416 .id_table = parport_tbl, 417 .probe = parport_init_chip, 418 .remove = __devexit_p(parport_remove_chip), 419 }; 420 421 int __devinit parport_gsc_init(void) 422 { 423 return register_parisc_driver(&parport_driver); 424 } 425 426 static void __devexit parport_gsc_exit(void) 427 { 428 unregister_parisc_driver(&parport_driver); 429 } 430 431 module_init(parport_gsc_init); 432 module_exit(parport_gsc_exit); 433