drivers/video/pmag-ba-fb.c - kernel/msm-4.9 - Gitiles

 /*
  *	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;

 	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 __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;
 	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);

 	pr_info("fb%d: %s frame buffer device at %s\n",
 		info->node, 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 __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");
	/*
	* 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;

	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 __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;
	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);

	pr_info("fb%d: %s frame buffer device at %s\n",
	info->node, 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 __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");