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 <linux/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 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 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 *parport_gsc_probe_port(unsigned long base, 236 unsigned long base_hi, int irq, 237 int dma, struct parisc_device *padev) 238 { 239 struct parport_gsc_private *priv; 240 struct parport_operations *ops; 241 struct parport tmp; 242 struct parport *p = &tmp; 243 244 priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL); 245 if (!priv) { 246 printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base); 247 return NULL; 248 } 249 ops = kmemdup(&parport_gsc_ops, sizeof(struct parport_operations), 250 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 priv->ctr = 0xc; 258 priv->ctr_writable = 0xff; 259 priv->dma_buf = 0; 260 priv->dma_handle = 0; 261 p->base = base; 262 p->base_hi = base_hi; 263 p->irq = irq; 264 p->dma = dma; 265 p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT; 266 p->ops = ops; 267 p->private_data = priv; 268 p->physport = p; 269 if (!parport_SPP_supported (p)) { 270 /* No port. */ 271 kfree (priv); 272 kfree(ops); 273 return NULL; 274 } 275 parport_PS2_supported (p); 276 277 if (!(p = parport_register_port(base, PARPORT_IRQ_NONE, 278 PARPORT_DMA_NONE, ops))) { 279 kfree (priv); 280 kfree (ops); 281 return NULL; 282 } 283 284 p->dev = &padev->dev; 285 p->base_hi = base_hi; 286 p->modes = tmp.modes; 287 p->size = (p->modes & PARPORT_MODE_EPP)?8:3; 288 p->private_data = priv; 289 290 printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base); 291 p->irq = irq; 292 if (p->irq == PARPORT_IRQ_AUTO) { 293 p->irq = PARPORT_IRQ_NONE; 294 } 295 if (p->irq != PARPORT_IRQ_NONE) { 296 pr_cont(", irq %d", p->irq); 297 298 if (p->dma == PARPORT_DMA_AUTO) { 299 p->dma = PARPORT_DMA_NONE; 300 } 301 } 302 if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq 303 is mandatory (see above) */ 304 p->dma = PARPORT_DMA_NONE; 305 306 pr_cont(" ["); 307 #define printmode(x) {if(p->modes&PARPORT_MODE_##x){pr_cont("%s%s",f?",":"",#x);f++;}} 308 { 309 int f = 0; 310 printmode(PCSPP); 311 printmode(TRISTATE); 312 printmode(COMPAT) 313 printmode(EPP); 314 // printmode(ECP); 315 // printmode(DMA); 316 } 317 #undef printmode 318 pr_cont("]\n"); 319 320 if (p->irq != PARPORT_IRQ_NONE) { 321 if (request_irq (p->irq, parport_irq_handler, 322 0, p->name, p)) { 323 printk (KERN_WARNING "%s: irq %d in use, " 324 "resorting to polled operation\n", 325 p->name, p->irq); 326 p->irq = PARPORT_IRQ_NONE; 327 p->dma = PARPORT_DMA_NONE; 328 } 329 } 330 331 /* Done probing. Now put the port into a sensible start-up state. */ 332 333 parport_gsc_write_data(p, 0); 334 parport_gsc_data_forward (p); 335 336 /* Now that we've told the sharing engine about the port, and 337 found out its characteristics, let the high-level drivers 338 know about it. */ 339 parport_announce_port (p); 340 341 return p; 342 } 343 344 345 #define PARPORT_GSC_OFFSET 0x800 346 347 static int parport_count; 348 349 static int __init parport_init_chip(struct parisc_device *dev) 350 { 351 struct parport *p; 352 unsigned long port; 353 354 if (!dev->irq) { 355 printk(KERN_WARNING "IRQ not found for parallel device at 0x%llx\n", 356 (unsigned long long)dev->hpa.start); 357 return -ENODEV; 358 } 359 360 port = dev->hpa.start + PARPORT_GSC_OFFSET; 361 362 /* some older machines with ASP-chip don't support 363 * the enhanced parport modes. 364 */ 365 if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) { 366 367 /* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */ 368 printk("%s: initialize bidirectional-mode.\n", __func__); 369 parport_writeb ( (0x10 + 0x20), port + 4); 370 371 } else { 372 printk("%s: enhanced parport-modes not supported.\n", __func__); 373 } 374 375 p = parport_gsc_probe_port(port, 0, dev->irq, 376 /* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, dev); 377 if (p) 378 parport_count++; 379 dev_set_drvdata(&dev->dev, p); 380 381 return 0; 382 } 383 384 static int __exit parport_remove_chip(struct parisc_device *dev) 385 { 386 struct parport *p = dev_get_drvdata(&dev->dev); 387 if (p) { 388 struct parport_gsc_private *priv = p->private_data; 389 struct parport_operations *ops = p->ops; 390 parport_remove_port(p); 391 if (p->dma != PARPORT_DMA_NONE) 392 free_dma(p->dma); 393 if (p->irq != PARPORT_IRQ_NONE) 394 free_irq(p->irq, p); 395 if (priv->dma_buf) 396 pci_free_consistent(priv->dev, PAGE_SIZE, 397 priv->dma_buf, 398 priv->dma_handle); 399 kfree (p->private_data); 400 parport_put_port(p); 401 kfree (ops); /* hope no-one cached it */ 402 } 403 return 0; 404 } 405 406 static const struct parisc_device_id parport_tbl[] __initconst = { 407 { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 }, 408 { 0, } 409 }; 410 411 MODULE_DEVICE_TABLE(parisc, parport_tbl); 412 413 static struct parisc_driver parport_driver __refdata = { 414 .name = "Parallel", 415 .id_table = parport_tbl, 416 .probe = parport_init_chip, 417 .remove = __exit_p(parport_remove_chip), 418 }; 419 420 int parport_gsc_init(void) 421 { 422 return register_parisc_driver(&parport_driver); 423 } 424 425 static void parport_gsc_exit(void) 426 { 427 unregister_parisc_driver(&parport_driver); 428 } 429 430 module_init(parport_gsc_init); 431 module_exit(parport_gsc_exit); 432