parport_ax88796.c 9.27 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
/* linux/drivers/parport/parport_ax88796.c
 *
 * (c) 2005,2006 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/parport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
18
#include <linux/slab.h>
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295

#include <asm/io.h>
#include <asm/irq.h>

#define AX_SPR_BUSY		(1<<7)
#define AX_SPR_ACK		(1<<6)
#define AX_SPR_PE		(1<<5)
#define AX_SPR_SLCT		(1<<4)
#define AX_SPR_ERR		(1<<3)

#define AX_CPR_nDOE		(1<<5)
#define AX_CPR_SLCTIN		(1<<3)
#define AX_CPR_nINIT		(1<<2)
#define AX_CPR_ATFD		(1<<1)
#define AX_CPR_STRB		(1<<0)

struct ax_drvdata {
	struct parport		*parport;
	struct parport_state	 suspend;

	struct device		*dev;
	struct resource		*io;

	unsigned char		 irq_enabled;

	void __iomem		*base;
	void __iomem		*spp_data;
	void __iomem		*spp_spr;
	void __iomem		*spp_cpr;
};

static inline struct ax_drvdata *pp_to_drv(struct parport *p)
{
	return p->private_data;
}

static unsigned char
parport_ax88796_read_data(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);

	return readb(dd->spp_data);
}

static void
parport_ax88796_write_data(struct parport *p, unsigned char data)
{
	struct ax_drvdata *dd = pp_to_drv(p);

	writeb(data, dd->spp_data);
}

static unsigned char
parport_ax88796_read_control(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	unsigned int cpr = readb(dd->spp_cpr);
	unsigned int ret = 0;

	if (!(cpr & AX_CPR_STRB))
		ret |= PARPORT_CONTROL_STROBE;

	if (!(cpr & AX_CPR_ATFD))
		ret |= PARPORT_CONTROL_AUTOFD;

	if (cpr & AX_CPR_nINIT)
		ret |= PARPORT_CONTROL_INIT;

	if (!(cpr & AX_CPR_SLCTIN))
		ret |= PARPORT_CONTROL_SELECT;

	return ret;
}

static void
parport_ax88796_write_control(struct parport *p, unsigned char control)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	unsigned int cpr = readb(dd->spp_cpr);

	cpr &= AX_CPR_nDOE;

	if (!(control & PARPORT_CONTROL_STROBE))
		cpr |= AX_CPR_STRB;

	if (!(control & PARPORT_CONTROL_AUTOFD))
		cpr |= AX_CPR_ATFD;

	if (control & PARPORT_CONTROL_INIT)
		cpr |= AX_CPR_nINIT;

	if (!(control & PARPORT_CONTROL_SELECT))
		cpr |= AX_CPR_SLCTIN;

	dev_dbg(dd->dev, "write_control: ctrl=%02x, cpr=%02x\n", control, cpr);
	writeb(cpr, dd->spp_cpr);

	if (parport_ax88796_read_control(p) != control) {
		dev_err(dd->dev, "write_control: read != set (%02x, %02x)\n",
			parport_ax88796_read_control(p), control);
	}
}

static unsigned char
parport_ax88796_read_status(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	unsigned int status = readb(dd->spp_spr);
	unsigned int ret = 0;

	if (status & AX_SPR_BUSY)
		ret |= PARPORT_STATUS_BUSY;

	if (status & AX_SPR_ACK)
		ret |= PARPORT_STATUS_ACK;

	if (status & AX_SPR_ERR)
		ret |= PARPORT_STATUS_ERROR;

	if (status & AX_SPR_SLCT)
		ret |= PARPORT_STATUS_SELECT;

	if (status & AX_SPR_PE)
		ret |= PARPORT_STATUS_PAPEROUT;

	return ret;
}

static unsigned char
parport_ax88796_frob_control(struct parport *p, unsigned char mask,
			     unsigned char val)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	unsigned char old = parport_ax88796_read_control(p);

	dev_dbg(dd->dev, "frob: mask=%02x, val=%02x, old=%02x\n",
		mask, val, old);

	parport_ax88796_write_control(p, (old & ~mask) | val);
	return old;
}

static void
parport_ax88796_enable_irq(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	unsigned long flags;

	local_irq_save(flags);
	if (!dd->irq_enabled) {
		enable_irq(p->irq);
		dd->irq_enabled = 1;
	}
	local_irq_restore(flags);
}

static void
parport_ax88796_disable_irq(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	unsigned long flags;

	local_irq_save(flags);
	if (dd->irq_enabled) {
		disable_irq(p->irq);
		dd->irq_enabled = 0;
	}
	local_irq_restore(flags);
}

static void
parport_ax88796_data_forward(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	void __iomem *cpr = dd->spp_cpr;

	writeb((readb(cpr) & ~AX_CPR_nDOE), cpr);
}

static void
parport_ax88796_data_reverse(struct parport *p)
{
	struct ax_drvdata *dd = pp_to_drv(p);
	void __iomem *cpr = dd->spp_cpr;

	writeb(readb(cpr) | AX_CPR_nDOE, cpr);
}

static void
parport_ax88796_init_state(struct pardevice *d, struct parport_state *s)
{
	struct ax_drvdata *dd = pp_to_drv(d->port);

	memset(s, 0, sizeof(struct parport_state));

	dev_dbg(dd->dev, "init_state: %p: state=%p\n", d, s);
	s->u.ax88796.cpr = readb(dd->spp_cpr);
}

static void
parport_ax88796_save_state(struct parport *p, struct parport_state *s)
{
	struct ax_drvdata *dd = pp_to_drv(p);

	dev_dbg(dd->dev, "save_state: %p: state=%p\n", p, s);
	s->u.ax88796.cpr = readb(dd->spp_cpr);
}

static void
parport_ax88796_restore_state(struct parport *p, struct parport_state *s)
{
	struct ax_drvdata *dd = pp_to_drv(p);

	dev_dbg(dd->dev, "restore_state: %p: state=%p\n", p, s);
	writeb(s->u.ax88796.cpr, dd->spp_cpr);
}

static struct parport_operations parport_ax88796_ops = {
	.write_data	= parport_ax88796_write_data,
	.read_data	= parport_ax88796_read_data,

	.write_control	= parport_ax88796_write_control,
	.read_control	= parport_ax88796_read_control,
	.frob_control	= parport_ax88796_frob_control,

	.read_status	= parport_ax88796_read_status,

	.enable_irq	= parport_ax88796_enable_irq,
	.disable_irq	= parport_ax88796_disable_irq,

	.data_forward	= parport_ax88796_data_forward,
	.data_reverse	= parport_ax88796_data_reverse,

	.init_state	= parport_ax88796_init_state,
	.save_state	= parport_ax88796_save_state,
	.restore_state	= parport_ax88796_restore_state,

	.epp_write_data	= parport_ieee1284_epp_write_data,
	.epp_read_data	= parport_ieee1284_epp_read_data,
	.epp_write_addr	= parport_ieee1284_epp_write_addr,
	.epp_read_addr	= parport_ieee1284_epp_read_addr,

	.ecp_write_data	= parport_ieee1284_ecp_write_data,
	.ecp_read_data	= parport_ieee1284_ecp_read_data,
	.ecp_write_addr	= parport_ieee1284_ecp_write_addr,

	.compat_write_data	= parport_ieee1284_write_compat,
	.nibble_read_data	= parport_ieee1284_read_nibble,
	.byte_read_data		= parport_ieee1284_read_byte,

	.owner		= THIS_MODULE,
};

static int parport_ax88796_probe(struct platform_device *pdev)
{
	struct device *_dev = &pdev->dev;
	struct ax_drvdata *dd;
	struct parport *pp = NULL;
	struct resource *res;
	unsigned long size;
	int spacing;
	int irq;
	int ret;

	dd = kzalloc(sizeof(struct ax_drvdata), GFP_KERNEL);
	if (dd == NULL) {
		dev_err(_dev, "no memory for private data\n");
		return -ENOMEM;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
		dev_err(_dev, "no MEM specified\n");
		ret = -ENXIO;
		goto exit_mem;
	}

296
	size = resource_size(res);
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339
	spacing = size / 3;

	dd->io = request_mem_region(res->start, size, pdev->name);
	if (dd->io == NULL) {
		dev_err(_dev, "cannot reserve memory\n");
		ret = -ENXIO;
		goto exit_mem;
	}

	dd->base = ioremap(res->start, size);
	if (dd->base == NULL) {
		dev_err(_dev, "cannot ioremap region\n");
		ret = -ENXIO;
		goto exit_res;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0)
		irq = PARPORT_IRQ_NONE;

	pp = parport_register_port((unsigned long)dd->base, irq,
				   PARPORT_DMA_NONE,
				   &parport_ax88796_ops);

	if (pp == NULL) {
		dev_err(_dev, "failed to register parallel port\n");
		ret = -ENOMEM;
		goto exit_unmap;
	}

	pp->private_data = dd;
	dd->parport = pp;
	dd->dev = _dev;

	dd->spp_data = dd->base;
	dd->spp_spr  = dd->base + (spacing * 1);
	dd->spp_cpr  = dd->base + (spacing * 2);

	/* initialise the port controls */
	writeb(AX_CPR_STRB, dd->spp_cpr);

	if (irq >= 0) {
		/* request irq */
340
		ret = request_irq(irq, parport_irq_handler,
341
				  IRQF_TRIGGER_FALLING, pdev->name, pp);
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409

		if (ret < 0)
			goto exit_port;

		dd->irq_enabled = 1;
	}

	platform_set_drvdata(pdev, pp);

	dev_info(_dev, "attached parallel port driver\n");
	parport_announce_port(pp);

	return 0;

 exit_port:
	parport_remove_port(pp);
 exit_unmap:
	iounmap(dd->base);
 exit_res:
	release_resource(dd->io);
	kfree(dd->io);
 exit_mem:
	kfree(dd);
	return ret;
}

static int parport_ax88796_remove(struct platform_device *pdev)
{
	struct parport *p = platform_get_drvdata(pdev);
	struct ax_drvdata *dd = pp_to_drv(p);

	free_irq(p->irq, p);
	parport_remove_port(p);
	iounmap(dd->base);
	release_resource(dd->io);
	kfree(dd->io);
	kfree(dd);

	return 0;
}

#ifdef CONFIG_PM

static int parport_ax88796_suspend(struct platform_device *dev,
				   pm_message_t state)
{
	struct parport *p = platform_get_drvdata(dev);
	struct ax_drvdata *dd = pp_to_drv(p);

	parport_ax88796_save_state(p, &dd->suspend);
	writeb(AX_CPR_nDOE | AX_CPR_STRB, dd->spp_cpr);
	return 0;
}

static int parport_ax88796_resume(struct platform_device *dev)
{
	struct parport *p = platform_get_drvdata(dev);
	struct ax_drvdata *dd = pp_to_drv(p);

	parport_ax88796_restore_state(p, &dd->suspend);
	return 0;
}

#else
#define parport_ax88796_suspend NULL
#define parport_ax88796_resume  NULL
#endif

410 411
MODULE_ALIAS("platform:ax88796-pp");

412 413 414 415 416 417 418 419 420 421
static struct platform_driver axdrv = {
	.driver		= {
		.name	= "ax88796-pp",
	},
	.probe		= parport_ax88796_probe,
	.remove		= parport_ax88796_remove,
	.suspend	= parport_ax88796_suspend,
	.resume		= parport_ax88796_resume,
};

422
module_platform_driver(axdrv);
423 424 425 426

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("AX88796 Parport parallel port driver");
MODULE_LICENSE("GPL");