[deliverable/linux.git] / drivers / video / 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 <asm/system.h>

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


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


static struct fb_var_screeninfo pmagbafb_defined __initdata = {
	.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	= 12,
	.hsync_len	= 128,
	.vsync_len	= 3,
	.sync		= FB_SYNC_ON_GREEN,
	.vmode		= FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
	.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;

	BUG_ON(regno >= info->cmap.len);

	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 __init 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 __init 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;

	info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
	if (!info)
		return -ENOMEM;

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

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
		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->bus_id))
		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)
		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)
		goto err_mmio_map;
	info->screen_size = info->fix.smem_len;

	pmagbafb_erase_cursor(info);

	if (register_framebuffer(info) < 0)
		goto err_smem_map;

	get_device(dev);

	pr_info("fb%d: %s frame buffer device at %s\n",
		info->node, info->fix.id, dev->bus_id);

	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 -ENXIO;
}

static int __exit 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	= __exit_p(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 RB	35	#include <asm/io.h>
	36	#include <asm/system.h>
	37
1da177e4 LT	38	#include <video/pmag-ba-fb.h>
1da177e4 LT	39
af690a94 RB	40
af690a94 RB	41	struct pmagbafb_par {
af690a94 RB	42	volatile void __iomem *mmio;
af690a94 RB	43	volatile u32 __iomem *dac;
1da177e4 LT	44	};
1da177e4 LT	45
1da177e4	46
af690a94	47	static struct fb_var_screeninfo pmagbafb_defined __initdata = {
1da177e4 LT	48	.xres = 1024,
	49	.yres = 864,
	50	.xres_virtual = 1024,
	51	.yres_virtual = 864,
	52	.bits_per_pixel = 8,
	53	.red.length = 8,
	54	.green.length = 8,
	55	.blue.length = 8,
	56	.activate = FB_ACTIVATE_NOW,
af690a94 RB	57	.height = -1,
	58	.width = -1,
	59	.accel_flags = FB_ACCEL_NONE,
	60	.pixclock = 14452,
	61	.left_margin = 116,
	62	.right_margin = 12,
	63	.upper_margin = 34,
	64	.lower_margin = 12,
	65	.hsync_len = 128,
	66	.vsync_len = 3,
	67	.sync = FB_SYNC_ON_GREEN,
1da177e4 LT	68	.vmode = FB_VMODE_NONINTERLACED,
	69	};
	70
af690a94	71	static struct fb_fix_screeninfo pmagbafb_fix __initdata = {
1da177e4	72	.id = "PMAG-BA",
af690a94	73	.smem_len = (1024 * 1024),
1da177e4 LT	74	.type = FB_TYPE_PACKED_PIXELS,
	75	.visual = FB_VISUAL_PSEUDOCOLOR,
	76	.line_length = 1024,
af690a94	77	.mmio_len = PMAG_BA_SIZE - PMAG_BA_BT459,
1da177e4 LT	78	};
1da177e4 LT	79
af690a94 RB	80
af690a94 RB	81	static inline void dac_write(struct pmagbafb_par *par, unsigned int reg, u8 v)
1da177e4	82	{
af690a94	83	writeb(v, par->dac + reg / 4);
1da177e4 LT	84	}
1da177e4 LT	85
af690a94 RB	86	static inline u8 dac_read(struct pmagbafb_par *par, unsigned int reg)
	87	{
	88	return readb(par->dac + reg / 4);
	89	}
	90
	91
1da177e4	92	/*
af690a94	93	* Set the palette.
1da177e4	94	*/
af690a94 RB	95	static int pmagbafb_setcolreg(unsigned int regno, unsigned int red,
	96	unsigned int green, unsigned int blue,
	97	unsigned int transp, struct fb_info *info)
1da177e4	98	{
af690a94	99	struct pmagbafb_par *par = info->par;
1da177e4	100
af690a94	101	BUG_ON(regno >= info->cmap.len);
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	*/
	132	static void __init pmagbafb_erase_cursor(struct fb_info *info)
	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
335dc50c	144	static int __init 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;
af690a94	150
335dc50c	151	info = framebuffer_alloc(sizeof(struct pmagbafb_par), dev);
af690a94 RB	152	if (!info)
	153	return -ENOMEM;
	154
	155	par = info->par;
335dc50c	156	dev_set_drvdata(dev, info);
af690a94 RB	157
	158	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
	159	goto err_alloc;
	160
1da177e4	161	info->fbops = &pmagbafb_ops;
af690a94	162	info->fix = pmagbafb_fix;
1da177e4	163	info->var = pmagbafb_defined;
1da177e4 LT	164	info->flags = FBINFO_DEFAULT;
1da177e4 LT	165
335dc50c MR	166	/* Request the I/O MEM resource. */
	167	start = tdev->resource.start;
	168	len = tdev->resource.end - start + 1;
	169	if (!request_mem_region(start, len, dev->bus_id))
	170	goto err_cmap;
	171
af690a94	172	/* MMIO mapping setup. */
335dc50c	173	info->fix.mmio_start = start;
af690a94 RB	174	par->mmio = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);
af690a94 RB	175	if (!par->mmio)
335dc50c	176	goto err_resource;
af690a94 RB	177	par->dac = par->mmio + PMAG_BA_BT459;
	178
	179	/* Frame buffer mapping setup. */
335dc50c	180	info->fix.smem_start = start + PMAG_BA_FBMEM;
af690a94 RB	181	info->screen_base = ioremap_nocache(info->fix.smem_start,
	182	info->fix.smem_len);
	183	if (!info->screen_base)
	184	goto err_mmio_map;
	185	info->screen_size = info->fix.smem_len;
	186
	187	pmagbafb_erase_cursor(info);
1da177e4 LT	188
1da177e4 LT	189	if (register_framebuffer(info) < 0)
af690a94 RB	190	goto err_smem_map;
af690a94 RB	191
335dc50c MR	192	get_device(dev);
	193
	194	pr_info("fb%d: %s frame buffer device at %s\n",
	195	info->node, info->fix.id, dev->bus_id);
af690a94	196
1da177e4	197	return 0;
af690a94 RB	198
	199
	200	err_smem_map:
	201	iounmap(info->screen_base);
	202
	203	err_mmio_map:
	204	iounmap(par->mmio);
	205
335dc50c MR	206	err_resource:
	207	release_mem_region(start, len);
	208
af690a94 RB	209	err_cmap:
	210	fb_dealloc_cmap(&info->cmap);
	211
	212	err_alloc:
af690a94 RB	213	framebuffer_release(info);
af690a94 RB	214	return -ENXIO;
1da177e4 LT	215	}
1da177e4 LT	216
335dc50c	217	static int __exit pmagbafb_remove(struct device *dev)
af690a94	218	{
335dc50c MR	219	struct tc_dev *tdev = to_tc_dev(dev);
335dc50c MR	220	struct fb_info *info = dev_get_drvdata(dev);
af690a94	221	struct pmagbafb_par *par = info->par;
335dc50c	222	resource_size_t start, len;
1da177e4	223
335dc50c	224	put_device(dev);
af690a94 RB	225	unregister_framebuffer(info);
	226	iounmap(info->screen_base);
	227	iounmap(par->mmio);
335dc50c MR	228	start = tdev->resource.start;
	229	len = tdev->resource.end - start + 1;
	230	release_mem_region(start, len);
af690a94	231	fb_dealloc_cmap(&info->cmap);
af690a94	232	framebuffer_release(info);
335dc50c	233	return 0;
af690a94 RB	234	}
	235
	236
	237	/*
335dc50c	238	* Initialize the framebuffer.
af690a94	239	*/
335dc50c MR	240	static const struct tc_device_id pmagbafb_tc_table[] = {
	241	{ "DEC ", "PMAG-BA " },
	242	{ }
	243	};
	244	MODULE_DEVICE_TABLE(tc, pmagbafb_tc_table);
	245
	246	static struct tc_driver pmagbafb_driver = {
	247	.id_table = pmagbafb_tc_table,
	248	.driver = {
	249	.name = "pmagbafb",
	250	.bus = &tc_bus_type,
	251	.probe = pmagbafb_probe,
	252	.remove = __exit_p(pmagbafb_remove),
	253	},
	254	};
	255
af690a94	256	static int __init pmagbafb_init(void)
1da177e4	257	{
335dc50c	258	#ifndef MODULE
1da177e4	259	if (fb_get_options("pmagbafb", NULL))
af690a94	260	return -ENXIO;
335dc50c MR	261	#endif
335dc50c MR	262	return tc_register_driver(&pmagbafb_driver);
1da177e4 LT	263	}
1da177e4 LT	264
af690a94 RB	265	static void __exit pmagbafb_exit(void)
af690a94 RB	266	{
335dc50c	267	tc_unregister_driver(&pmagbafb_driver);
af690a94 RB	268	}
	269
	270
1da177e4	271	module_init(pmagbafb_init);
af690a94 RB	272	module_exit(pmagbafb_exit);
af690a94 RB	273
1da177e4	274	MODULE_LICENSE("GPL");