1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *      Low-level parallel-support for PC-style hardware integrated in the 
4  *	LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
6  *	(C) 1999-2001 by Helge Deller <deller@gmx.de>
36 #include <asm/parisc-device.h>
42 MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");
78 	s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);  in parport_gsc_init_state()
83 	s->u.pc.ctr = parport_readb (CONTROL (p));  in parport_gsc_save_state()
88 	parport_writeb (s->u.pc.ctr, CONTROL (p));  in parport_gsc_restore_state()
128 /* --- Mode detection ------------------------------------- */
145 	/* Do a simple read-write test to make sure the port exists. */  in parport_SPP_supported()
164 	/* Try the data register.  The data lines aren't tri-stated at  in parport_SPP_supported()
188  * Some SPP ports have "half PS/2" ability - you can't turn off the line
203 	/* try to tri-state the buffer */  in parport_PS2_supported()
216 		pb->modes |= PARPORT_MODE_TRISTATE;  in parport_PS2_supported()
218 		struct parport_gsc_private *priv = pb->private_data;  in parport_PS2_supported()
219 		priv->ctr_writable &= ~0x20;  in parport_PS2_supported()
226 /* --- Initialisation code -------------------------------- */
250 	priv->ctr = 0xc;  in parport_gsc_probe_port()
251 	priv->ctr_writable = 0xff;  in parport_gsc_probe_port()
252 	p->base = base;  in parport_gsc_probe_port()
253 	p->base_hi = base_hi;  in parport_gsc_probe_port()
254 	p->irq = irq;  in parport_gsc_probe_port()
255 	p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;  in parport_gsc_probe_port()
256 	p->ops = ops;  in parport_gsc_probe_port()
257 	p->private_data = priv;  in parport_gsc_probe_port()
258 	p->physport = p;  in parport_gsc_probe_port()
274 	p->dev = &padev->dev;  in parport_gsc_probe_port()
275 	p->base_hi = base_hi;  in parport_gsc_probe_port()
276 	p->modes = tmp.modes;  in parport_gsc_probe_port()
277 	p->size = (p->modes & PARPORT_MODE_EPP)?8:3;  in parport_gsc_probe_port()
278 	p->private_data = priv;  in parport_gsc_probe_port()
280 	pr_info("%s: PC-style at 0x%lx", p->name, p->base);  in parport_gsc_probe_port()
281 	p->irq = irq;  in parport_gsc_probe_port()
282 	if (p->irq == PARPORT_IRQ_AUTO) {  in parport_gsc_probe_port()
283 		p->irq = PARPORT_IRQ_NONE;  in parport_gsc_probe_port()
285 	if (p->irq != PARPORT_IRQ_NONE)  in parport_gsc_probe_port()
286 		pr_cont(", irq %d", p->irq);  in parport_gsc_probe_port()
291 	if (p->modes & PARPORT_MODE_##x)				\  in parport_gsc_probe_port()
306 	if (p->irq != PARPORT_IRQ_NONE) {  in parport_gsc_probe_port()
307 		if (request_irq (p->irq, parport_irq_handler,  in parport_gsc_probe_port()
308 				 0, p->name, p)) {  in parport_gsc_probe_port()
310 				p->name, p->irq);  in parport_gsc_probe_port()
311 			p->irq = PARPORT_IRQ_NONE;  in parport_gsc_probe_port()
315 	/* Done probing.  Now put the port into a sensible start-up state. */  in parport_gsc_probe_port()
321 	   found out its characteristics, let the high-level drivers  in parport_gsc_probe_port()
338 	if (!dev->irq) {  in parport_init_chip()
340 			(unsigned long long)dev->hpa.start);  in parport_init_chip()
341 		return -ENODEV;  in parport_init_chip()
344 	port = dev->hpa.start + PARPORT_GSC_OFFSET;  in parport_init_chip()
346 	/* some older machines with ASP-chip don't support  in parport_init_chip()
351 		/* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */  in parport_init_chip()
352 		pr_info("%s: initialize bidirectional-mode\n", __func__);  in parport_init_chip()
356 		pr_info("%s: enhanced parport-modes not supported\n", __func__);  in parport_init_chip()
359 	p = parport_gsc_probe_port(port, 0, dev->irq, dev);  in parport_init_chip()
362 	dev_set_drvdata(&dev->dev, p);  in parport_init_chip()
369 	struct parport *p = dev_get_drvdata(&dev->dev);  in parport_remove_chip()
371 		struct parport_operations *ops = p->ops;  in parport_remove_chip()
373 		if (p->irq != PARPORT_IRQ_NONE)  in parport_remove_chip()
374 			free_irq(p->irq, p);  in parport_remove_chip()
375 		kfree (p->private_data);  in parport_remove_chip()
377 		kfree (ops); /* hope no-one cached it */  in parport_remove_chip()