[mirror_ubuntu-bionic-kernel.git] / drivers / video / fbdev / pmag-ba-fb.c

/*
 *	linux/drivers/video/pmag-ba-fb.c
 *
 *	PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
 *	derived from:
 *	"HP300 Topcat framebuffer support (derived from macfb of all things)
 *	Phil Blundell <philb@gnu.org> 1998", the original code can be
 *	found in the file hpfb.c in the same directory.
 *
 *	Based on digital document:
 * 	"PMAG-BA TURBOchannel Color Frame Buffer
 *	 Functional Specification", Revision 1.2, August 27, 1990
 *
 *	DECstation related code Copyright (C) 1999, 2000, 2001 by
 *	Michael Engel <engel@unix-ag.org>,
 *	Karsten Merker <merker@linuxtag.org> and
 *	Harald Koerfgen.
 *	Copyright (c) 2005, 2006  Maciej W. Rozycki
 *	Copyright (c) 2005  James Simmons
 *
 *	This file is subject to the terms and conditions of the GNU General
 *	Public License.  See the file COPYING in the main directory of this
 *	archive for more details.
 */

#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/tc.h>
#include <linux/types.h>

#include <asm/io.h>

#include <video/pmag-ba-fb.h>


struct pmagbafb_par {
	volatile void __iomem *mmio;
	volatile u32 __iomem *dac;
};


static const struct fb_var_screeninfo pmagbafb_defined = {
	.xres		= 1024,
	.yres		= 864,
	.xres_virtual	= 1024,
	.yres_virtual	= 864,
	.bits_per_pixel	= 8,
	.red.length	= 8,
	.green.length	= 8,
	.blue.length	= 8,
	.activate	= FB_ACTIVATE_NOW,
	.height		= -1,
	.width		= -1,
	.accel_flags	= FB_ACCEL_NONE,
	.pixclock	= 14452,
	.left_margin	= 116,
	.right_margin	= 12,
	.upper_margin	= 34,
	.lower_margin	= 0,
	.hsync_len	= 128,
	.vsync_len	= 3,
	.sync		= FB_SYNC_ON_GREEN,
	.vmode		= FB_VMODE_NONINTERLACED,
};

static const struct fb_fix_screeninfo pmagbafb_fix = {
	.id		= "PMAG-BA",
	.smem_len	= (1024 * 1024),
	.type		= FB_TYPE_PACKED_PIXELS,
	.visual		= FB_VISUAL_PSEUDOCOLOR,
	.line_length	= 1024,
	.mmio_len	= PMAG_BA_SIZE - PMAG_BA_BT459,
};


static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
{
	writeb(v, par->dac + reg / 4);
}

static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
{
	return readb(par->dac + reg / 4);
}


/*
 * Set the palette.
 */
static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
			      unsigned int green, unsigned int blue,
			      unsigned int transp, struct fb_info *info)
{
	struct pmagbafb_par *par = info->par;

	if (regno >= info->cmap.len)
		return 1;

	red   >>= 8;	/* The cmap fields are 16 bits    */
	green >>= 8;	/* wide, but the hardware colormap */
	blue  >>= 8;	/* registers are only 8 bits wide */

	mb();
	dac_write(par, BT459_ADDR_LO, regno);
	dac_write(par, BT459_ADDR_HI, 0x00);
	wmb();
	dac_write(par, BT459_CMAP, red);
	wmb();
	dac_write(par, BT459_CMAP, green);
	wmb();
	dac_write(par, BT459_CMAP, blue);

	return 0;
}

static struct fb_ops pmagbafb_ops = {
	.owner		= THIS_MODULE,
	.fb_setcolreg	= pmagbafb_setcolreg,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};


/*
 * Turn the hardware cursor off.
 */
static void pmagbafb_erase_cursor(struct fb_info *info)
{
	struct pmagbafb_par *par = info->par;

	mb();
	dac_write(par, BT459_ADDR_LO, 0x00);
	dac_write(par, BT459_ADDR_HI, 0x03);
	wmb();
	dac_write(par, BT459_DATA, 0x00);
}


static int pmagbafb_probe(struct device *dev)
{
	struct tc_dev *tdev = to_tc_dev(dev);
	resource_size_t start, len;
	struct fb_info *info;
	struct pmagbafb_par *par;
	int err;

	info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
	if (!info) {
		printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
		return -ENOMEM;
	}

	par = info->par;
	dev_set_drvdata(dev, info);

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
		printk(KERN_ERR "%s: Cannot allocate color map\n",
		       dev_name(dev));
		err = -ENOMEM;
		goto err_alloc;
	}

	info->fbops = &pmagbafb_ops;
	info->fix = pmagbafb_fix;
	info->var = pmagbafb_defined;
	info->flags = FBINFO_DEFAULT;

	/* Request the I/O MEM resource.  */
	start = tdev->resource.start;
	len = tdev->resource.end - start + 1;
	if (!request_mem_region(start, len, dev_name(dev))) {
		printk(KERN_ERR "%s: Cannot reserve FB region\n",
		       dev_name(dev));
		err = -EBUSY;
		goto err_cmap;
	}

	/* MMIO mapping setup.  */
	info->fix.mmio_start = start;
	par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
	if (!par->mmio) {
		printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
		err = -ENOMEM;
		goto err_resource;
	}
	par->dac = par->mmio + PMAG_BA_BT459;

	/* Frame buffer mapping setup.  */
	info->fix.smem_start = start + PMAG_BA_FBMEM;
	info->screen_base = ioremap_nocache(info->fix.smem_start,
					    info->fix.smem_len);
	if (!info->screen_base) {
		printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
		err = -ENOMEM;
		goto err_mmio_map;
	}
	info->screen_size = info->fix.smem_len;

	pmagbafb_erase_cursor(info);

	err = register_framebuffer(info);
	if (err < 0) {
		printk(KERN_ERR "%s: Cannot register framebuffer\n",
		       dev_name(dev));
		goto err_smem_map;
	}

	get_device(dev);

	fb_info(info, "%s frame buffer device at %s\n",
		info->fix.id, dev_name(dev));

	return 0;


err_smem_map:
	iounmap(info->screen_base);

err_mmio_map:
	iounmap(par->mmio);

err_resource:
	release_mem_region(start, len);

err_cmap:
	fb_dealloc_cmap(&info->cmap);

err_alloc:
	framebuffer_release(info);
	return err;
}

static int pmagbafb_remove(struct device *dev)
{
	struct tc_dev *tdev = to_tc_dev(dev);
	struct fb_info *info = dev_get_drvdata(dev);
	struct pmagbafb_par *par = info->par;
	resource_size_t start, len;

	put_device(dev);
	unregister_framebuffer(info);
	iounmap(info->screen_base);
	iounmap(par->mmio);
	start = tdev->resource.start;
	len = tdev->resource.end - start + 1;
	release_mem_region(start, len);
	fb_dealloc_cmap(&info->cmap);
	framebuffer_release(info);
	return 0;
}


/*
 * Initialize the framebuffer.
 */
static const struct tc_device_id pmagbafb_tc_table[] = {
	{ "DEC     ", "PMAG-BA " },
	{ }
};
MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);

static struct tc_driver pmagbafb_driver = {
	.id_table	= pmagbafb_tc_table,
	.driver		= {
		.name	= "pmagbafb",
		.bus	= &tc_bus_type,
		.probe	= pmagbafb_probe,
		.remove	= pmagbafb_remove,
	},
};

static int __init pmagbafb_init(void)
{
#ifndef MODULE
	if (fb_get_options("pmagbafb", NULL))
		return -ENXIO;
#endif
	return tc_register_driver(&pmagbafb_driver);
}

static void __exit pmagbafb_exit(void)
{
	tc_unregister_driver(&pmagbafb_driver);
}


module_init(pmagbafb_init);
module_exit(pmagbafb_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
af690a94	2	* linux/drivers/video/pmag-ba-fb.c
1da177e4	3	*
af690a94 RB	4	* PMAG-BA TURBOchannel Color Frame Buffer (CFB) card support,
af690a94 RB	5	* derived from:
1da177e4 LT	6	* "HP300 Topcat framebuffer support (derived from macfb of all things)
1da177e4 LT	7	* Phil Blundell <philb@gnu.org> 1998", the original code can be
af690a94	8	* found in the file hpfb.c in the same directory.
1da177e4 LT	9	*
	10	* Based on digital document:
	11	* "PMAG-BA TURBOchannel Color Frame Buffer
	12	* Functional Specification", Revision 1.2, August 27, 1990
	13	*
af690a94 RB	14	* DECstation related code Copyright (C) 1999, 2000, 2001 by
	15	* Michael Engel <engel@unix-ag.org>,
	16	* Karsten Merker <merker@linuxtag.org> and
1da177e4	17	* Harald Koerfgen.
335dc50c MR	18	* Copyright (c) 2005, 2006 Maciej W. Rozycki
335dc50c MR	19	* Copyright (c) 2005 James Simmons
1da177e4	20	*
af690a94 RB	21	* This file is subject to the terms and conditions of the GNU General
	22	* Public License. See the file COPYING in the main directory of this
	23	* archive for more details.
1da177e4	24	*/
af690a94 RB	25
af690a94 RB	26	#include <linux/compiler.h>
1da177e4	27	#include <linux/errno.h>
1da177e4	28	#include <linux/fb.h>
af690a94 RB	29	#include <linux/init.h>
	30	#include <linux/kernel.h>
	31	#include <linux/module.h>
335dc50c	32	#include <linux/tc.h>
af690a94 RB	33	#include <linux/types.h>
af690a94 RB	34
af690a94	35	#include <asm/io.h>
af690a94	36
1da177e4 LT	37	#include <video/pmag-ba-fb.h>
1da177e4 LT	38
af690a94 RB	39
af690a94 RB	40	struct pmagbafb_par {
af690a94 RB	41	volatile void __iomem *mmio;
af690a94 RB	42	volatile u32 __iomem *dac;
1da177e4 LT	43	};
1da177e4 LT	44
1da177e4	45
a7582733	46	static const struct fb_var_screeninfo pmagbafb_defined = {
1da177e4 LT	47	.xres = 1024,
	48	.yres = 864,
	49	.xres_virtual = 1024,
	50	.yres_virtual = 864,
	51	.bits_per_pixel = 8,
	52	.red.length = 8,
	53	.green.length = 8,
	54	.blue.length = 8,
	55	.activate = FB_ACTIVATE_NOW,
af690a94 RB	56	.height = -1,
	57	.width = -1,
	58	.accel_flags = FB_ACCEL_NONE,
	59	.pixclock = 14452,
	60	.left_margin = 116,
	61	.right_margin = 12,
	62	.upper_margin = 34,
af22f647	63	.lower_margin = 0,
af690a94 RB	64	.hsync_len = 128,
	65	.vsync_len = 3,
	66	.sync = FB_SYNC_ON_GREEN,
1da177e4 LT	67	.vmode = FB_VMODE_NONINTERLACED,
	68	};
	69
799b88de	70	static const struct fb_fix_screeninfo pmagbafb_fix = {
1da177e4	71	.id = "PMAG-BA",
af690a94	72	.smem_len = (1024 * 1024),
1da177e4 LT	73	.type = FB_TYPE_PACKED_PIXELS,
	74	.visual = FB_VISUAL_PSEUDOCOLOR,
	75	.line_length = 1024,
af690a94	76	.mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
1da177e4 LT	77	};
1da177e4 LT	78
af690a94 RB	79
af690a94 RB	80	static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
1da177e4	81	{
af690a94	82	writeb(v, par->dac + reg / 4);
1da177e4 LT	83	}
1da177e4 LT	84
af690a94 RB	85	static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
	86	{
	87	return readb(par->dac + reg / 4);
	88	}
	89
	90
1da177e4	91	/*
af690a94	92	* Set the palette.
1da177e4	93	*/
af690a94 RB	94	static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
	95	unsigned int green, unsigned int blue,
	96	unsigned int transp, struct fb_info *info)
1da177e4	97	{
af690a94	98	struct pmagbafb_par *par = info->par;
1da177e4	99
2f390380 KH	100	if (regno >= info->cmap.len)
2f390380 KH	101	return 1;
1da177e4 LT	102
1da177e4 LT	103	red >>= 8; /* The cmap fields are 16 bits */
af690a94	104	green >>= 8; /* wide, but the hardware colormap */
1da177e4 LT	105	blue >>= 8; /* registers are only 8 bits wide */
1da177e4 LT	106
af690a94 RB	107	mb();
	108	dac_write(par, BT459_ADDR_LO, regno);
	109	dac_write(par, BT459_ADDR_HI, 0x00);
	110	wmb();
	111	dac_write(par, BT459_CMAP, red);
	112	wmb();
	113	dac_write(par, BT459_CMAP, green);
	114	wmb();
	115	dac_write(par, BT459_CMAP, blue);
	116
1da177e4 LT	117	return 0;
	118	}
	119
	120	static struct fb_ops pmagbafb_ops = {
	121	.owner = THIS_MODULE,
1da177e4 LT	122	.fb_setcolreg = pmagbafb_setcolreg,
	123	.fb_fillrect = cfb_fillrect,
	124	.fb_copyarea = cfb_copyarea,
	125	.fb_imageblit = cfb_imageblit,
1da177e4 LT	126	};
1da177e4 LT	127
af690a94 RB	128
	129	/*
	130	* Turn the hardware cursor off.
	131	*/
879e5a0d	132	static void pmagbafb_erase_cursor(struct fb_info *info)
af690a94 RB	133	{
	134	struct pmagbafb_par *par = info->par;
	135
	136	mb();
	137	dac_write(par, BT459_ADDR_LO, 0x00);
	138	dac_write(par, BT459_ADDR_HI, 0x03);
	139	wmb();
	140	dac_write(par, BT459_DATA, 0x00);
	141	}
	142
	143
48c68c4f	144	static int pmagbafb_probe(struct device *dev)
1da177e4	145	{
335dc50c MR	146	struct tc_dev *tdev = to_tc_dev(dev);
335dc50c MR	147	resource_size_t start, len;
af690a94 RB	148	struct fb_info *info;
af690a94 RB	149	struct pmagbafb_par *par;
53ee1b5b	150	int err;
af690a94	151
335dc50c	152	info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
53ee1b5b	153	if (!info) {
7ad33e74	154	printk(KERN_ERR "%s: Cannot allocate memory\n", dev_name(dev));
af690a94	155	return -ENOMEM;
53ee1b5b	156	}
af690a94 RB	157
af690a94 RB	158	par = info->par;
335dc50c	159	dev_set_drvdata(dev, info);
af690a94	160
53ee1b5b MR	161	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
53ee1b5b MR	162	printk(KERN_ERR "%s: Cannot allocate color map\n",
7ad33e74	163	dev_name(dev));
53ee1b5b	164	err = -ENOMEM;
af690a94	165	goto err_alloc;
53ee1b5b	166	}
af690a94	167
1da177e4	168	info->fbops = &pmagbafb_ops;
af690a94	169	info->fix = pmagbafb_fix;
1da177e4	170	info->var = pmagbafb_defined;
1da177e4 LT	171	info->flags = FBINFO_DEFAULT;
1da177e4 LT	172
335dc50c MR	173	/* Request the I/O MEM resource. */
	174	start = tdev->resource.start;
	175	len = tdev->resource.end - start + 1;
7ad33e74 KS	176	if (!request_mem_region(start, len, dev_name(dev))) {
	177	printk(KERN_ERR "%s: Cannot reserve FB region\n",
	178	dev_name(dev));
53ee1b5b	179	err = -EBUSY;
335dc50c	180	goto err_cmap;
53ee1b5b	181	}
335dc50c	182
af690a94	183	/* MMIO mapping setup. */
335dc50c	184	info->fix.mmio_start = start;
af690a94	185	par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
53ee1b5b	186	if (!par->mmio) {
7ad33e74	187	printk(KERN_ERR "%s: Cannot map MMIO\n", dev_name(dev));
53ee1b5b	188	err = -ENOMEM;
335dc50c	189	goto err_resource;
53ee1b5b	190	}
af690a94 RB	191	par->dac = par->mmio + PMAG_BA_BT459;
	192
	193	/* Frame buffer mapping setup. */
335dc50c	194	info->fix.smem_start = start + PMAG_BA_FBMEM;
af690a94 RB	195	info->screen_base = ioremap_nocache(info->fix.smem_start,
af690a94 RB	196	info->fix.smem_len);
53ee1b5b	197	if (!info->screen_base) {
7ad33e74	198	printk(KERN_ERR "%s: Cannot map FB\n", dev_name(dev));
53ee1b5b	199	err = -ENOMEM;
af690a94	200	goto err_mmio_map;
53ee1b5b	201	}
af690a94 RB	202	info->screen_size = info->fix.smem_len;
	203
	204	pmagbafb_erase_cursor(info);
1da177e4	205
53ee1b5b MR	206	err = register_framebuffer(info);
	207	if (err < 0) {
	208	printk(KERN_ERR "%s: Cannot register framebuffer\n",
7ad33e74	209	dev_name(dev));
af690a94	210	goto err_smem_map;
53ee1b5b	211	}
af690a94	212
335dc50c MR	213	get_device(dev);
335dc50c MR	214
31b6780c JP	215	fb_info(info, "%s frame buffer device at %s\n",
31b6780c JP	216	info->fix.id, dev_name(dev));
af690a94	217
1da177e4	218	return 0;
af690a94 RB	219
	220
	221	err_smem_map:
	222	iounmap(info->screen_base);
	223
	224	err_mmio_map:
	225	iounmap(par->mmio);
	226
335dc50c MR	227	err_resource:
	228	release_mem_region(start, len);
	229
af690a94 RB	230	err_cmap:
	231	fb_dealloc_cmap(&info->cmap);
	232
	233	err_alloc:
af690a94	234	framebuffer_release(info);
53ee1b5b	235	return err;
1da177e4 LT	236	}
1da177e4 LT	237
982711cc	238	static int pmagbafb_remove(struct device *dev)
af690a94	239	{
335dc50c MR	240	struct tc_dev *tdev = to_tc_dev(dev);
335dc50c MR	241	struct fb_info *info = dev_get_drvdata(dev);
af690a94	242	struct pmagbafb_par *par = info->par;
335dc50c	243	resource_size_t start, len;
1da177e4	244
335dc50c	245	put_device(dev);
af690a94 RB	246	unregister_framebuffer(info);
	247	iounmap(info->screen_base);
	248	iounmap(par->mmio);
335dc50c MR	249	start = tdev->resource.start;
	250	len = tdev->resource.end - start + 1;
	251	release_mem_region(start, len);
af690a94	252	fb_dealloc_cmap(&info->cmap);
af690a94	253	framebuffer_release(info);
335dc50c	254	return 0;
af690a94 RB	255	}
	256
	257
	258	/*
335dc50c	259	* Initialize the framebuffer.
af690a94	260	*/
335dc50c MR	261	static const struct tc_device_id pmagbafb_tc_table[] = {
	262	{ "DEC ", "PMAG-BA " },
	263	{ }
	264	};
	265	MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
	266
	267	static struct tc_driver pmagbafb_driver = {
	268	.id_table = pmagbafb_tc_table,
	269	.driver = {
	270	.name = "pmagbafb",
	271	.bus = &tc_bus_type,
	272	.probe = pmagbafb_probe,
982711cc	273	.remove = pmagbafb_remove,
335dc50c MR	274	},
	275	};
	276
af690a94	277	static int __init pmagbafb_init(void)
1da177e4	278	{
335dc50c	279	#ifndef MODULE
1da177e4	280	if (fb_get_options("pmagbafb", NULL))
af690a94	281	return -ENXIO;
335dc50c MR	282	#endif
335dc50c MR	283	return tc_register_driver(&pmagbafb_driver);
1da177e4 LT	284	}
1da177e4 LT	285
af690a94 RB	286	static void __exit pmagbafb_exit(void)
af690a94 RB	287	{
335dc50c	288	tc_unregister_driver(&pmagbafb_driver);
af690a94 RB	289	}
	290
	291
1da177e4	292	module_init(pmagbafb_init);
af690a94 RB	293	module_exit(pmagbafb_exit);
af690a94 RB	294
1da177e4	295	MODULE_LICENSE("GPL");