[linux.git] / drivers / video / sh7760fb.c

/*
 * SH7760/SH7763 LCDC Framebuffer driver.
 *
 * (c) 2006-2008 MSC Vertriebsges.m.b.H.,
 *             Manuel Lauss <[email protected]>
 * (c) 2008 Nobuhiro Iwamatsu <[email protected]>
 *
 *  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.
 *
 * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
 *
 * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
 *     for his original source and testing!
 *
 * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
 */

#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/fb.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <asm/sh7760fb.h>

struct sh7760fb_par {
	void __iomem *base;
	int irq;

	struct sh7760fb_platdata *pd;	/* display information */

	dma_addr_t fbdma;	/* physical address */

	int rot;		/* rotation enabled? */

	u32 pseudo_palette[16];

	struct platform_device *dev;
	struct resource *ioarea;
	struct completion vsync;	/* vsync irq event */
};

static irqreturn_t sh7760fb_irq(int irq, void *data)
{
	struct completion *c = data;

	complete(c);

	return IRQ_HANDLED;
}

/* wait_for_lps - wait until power supply has reached a certain state. */
static int wait_for_lps(struct sh7760fb_par *par, int val)
{
	int i = 100;
	while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
		msleep(1);

	if (i <= 0)
		return -ETIMEDOUT;

	return 0;
}

/* en/disable the LCDC */
static int sh7760fb_blank(int blank, struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;
	struct sh7760fb_platdata *pd = par->pd;
	unsigned short cntr = ioread16(par->base + LDCNTR);
	unsigned short intr = ioread16(par->base + LDINTR);
	int lps;

	if (blank == FB_BLANK_UNBLANK) {
		intr |= VINT_START;
		cntr = LDCNTR_DON2 | LDCNTR_DON;
		lps = 3;
	} else {
		intr &= ~VINT_START;
		cntr = LDCNTR_DON2;
		lps = 0;
	}

	if (pd->blank)
		pd->blank(blank);

	iowrite16(intr, par->base + LDINTR);
	iowrite16(cntr, par->base + LDCNTR);

	return wait_for_lps(par, lps);
}

static int sh7760_setcolreg (u_int regno,
	u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info)
{
	u32 *palette = info->pseudo_palette;

	if (regno >= 16)
		return -EINVAL;

	/* only FB_VISUAL_TRUECOLOR supported */

	red >>= 16 - info->var.red.length;
	green >>= 16 - info->var.green.length;
	blue >>= 16 - info->var.blue.length;
	transp >>= 16 - info->var.transp.length;

	palette[regno] = (red << info->var.red.offset) |
		(green << info->var.green.offset) |
		(blue << info->var.blue.offset) |
		(transp << info->var.transp.offset);

	return 0;
}

static int sh7760fb_get_color_info(struct device *dev,
				   u16 lddfr, int *bpp, int *gray)
{
	int lbpp, lgray;

	lgray = lbpp = 0;

	switch (lddfr & LDDFR_COLOR_MASK) {
	case LDDFR_1BPP_MONO:
		lgray = 1;
		lbpp = 1;
		break;
	case LDDFR_2BPP_MONO:
		lgray = 1;
		lbpp = 2;
		break;
	case LDDFR_4BPP_MONO:
		lgray = 1;
	case LDDFR_4BPP:
		lbpp = 4;
		break;
	case LDDFR_6BPP_MONO:
		lgray = 1;
	case LDDFR_8BPP:
		lbpp = 8;
		break;
	case LDDFR_16BPP_RGB555:
	case LDDFR_16BPP_RGB565:
		lbpp = 16;
		lgray = 0;
		break;
	default:
		dev_dbg(dev, "unsupported LDDFR bit depth.\n");
		return -EINVAL;
	}

	if (bpp)
		*bpp = lbpp;
	if (gray)
		*gray = lgray;

	return 0;
}

static int sh7760fb_check_var(struct fb_var_screeninfo *var,
			      struct fb_info *info)
{
	struct fb_fix_screeninfo *fix = &info->fix;
	struct sh7760fb_par *par = info->par;
	int ret, bpp;

	/* get color info from register value */
	ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
	if (ret)
		return ret;

	var->bits_per_pixel = bpp;

	if ((var->grayscale) && (var->bits_per_pixel == 1))
		fix->visual = FB_VISUAL_MONO10;
	else if (var->bits_per_pixel >= 15)
		fix->visual = FB_VISUAL_TRUECOLOR;
	else
		fix->visual = FB_VISUAL_PSEUDOCOLOR;

	/* TODO: add some more validation here */
	return 0;
}

/*
 * sh7760fb_set_par - set videomode.
 *
 * NOTE: The rotation, grayscale and DSTN codepaths are
 *     totally untested!
 */
static int sh7760fb_set_par(struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;
	struct fb_videomode *vm = par->pd->def_mode;
	unsigned long sbase, dstn_off, ldsarl, stride;
	unsigned short hsynp, hsynw, htcn, hdcn;
	unsigned short vsynp, vsynw, vtln, vdln;
	unsigned short lddfr, ldmtr;
	int ret, bpp, gray;

	par->rot = par->pd->rotate;

	/* rotate only works with xres <= 320 */
	if (par->rot && (vm->xres > 320)) {
		dev_dbg(info->dev, "rotation disabled due to display size\n");
		par->rot = 0;
	}

	/* calculate LCDC reg vals from display parameters */
	hsynp = vm->right_margin + vm->xres;
	hsynw = vm->hsync_len;
	htcn = vm->left_margin + hsynp + hsynw;
	hdcn = vm->xres;
	vsynp = vm->lower_margin + vm->yres;
	vsynw = vm->vsync_len;
	vtln = vm->upper_margin + vsynp + vsynw;
	vdln = vm->yres;

	/* get color info from register value */
	ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
	if (ret)
		return ret;

	dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
		vdln, bpp, gray ? "grayscale" : "color",
		par->rot ? "rotated" : "normal");

#ifdef CONFIG_CPU_LITTLE_ENDIAN
	lddfr = par->pd->lddfr | (1 << 8);
#else
	lddfr = par->pd->lddfr & ~(1 << 8);
#endif

	ldmtr = par->pd->ldmtr;

	if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
		ldmtr |= LDMTR_CL1POL;
	if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
		ldmtr |= LDMTR_FLMPOL;

	/* shut down LCDC before changing display parameters */
	sh7760fb_blank(FB_BLANK_POWERDOWN, info);

	iowrite16(par->pd->ldickr, par->base + LDICKR);	/* pixclock */
	iowrite16(ldmtr, par->base + LDMTR);	/* polarities */
	iowrite16(lddfr, par->base + LDDFR);	/* color/depth */
	iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR);	/* rotate */
	iowrite16(par->pd->ldpmmr, par->base + LDPMMR);	/* Power Management */
	iowrite16(par->pd->ldpspr, par->base + LDPSPR);	/* Power Supply Ctrl */

	/* display resolution */
	iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
		  par->base + LDHCNR);
	iowrite16(vdln - 1, par->base + LDVDLNR);
	iowrite16(vtln - 1, par->base + LDVTLNR);
	/* h/v sync signals */
	iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
	iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
		  par->base + LDHSYNR);
	/* AC modulation sig */
	iowrite16(par->pd->ldaclnr, par->base + LDACLNR);

	stride = (par->rot) ? vtln : hdcn;
	if (!gray)
		stride *= (bpp + 7) >> 3;
	else {
		if (bpp == 1)
			stride >>= 3;
		else if (bpp == 2)
			stride >>= 2;
		else if (bpp == 4)
			stride >>= 1;
		/* 6 bpp == 8 bpp */
	}

	/* if rotated, stride must be power of 2 */
	if (par->rot) {
		unsigned long bit = 1 << 31;
		while (bit) {
			if (stride & bit)
				break;
			bit >>= 1;
		}
		if (stride & ~bit)
			stride = bit << 1;	/* not P-o-2, round up */
	}
	iowrite16(stride, par->base + LDLAOR);

	/* set display mem start address */
	sbase = (unsigned long)par->fbdma;
	if (par->rot)
		sbase += (hdcn - 1) * stride;

	iowrite32(sbase, par->base + LDSARU);

	/*
	 * for DSTN need to set address for lower half.
	 * I (mlau) don't know which address to set it to,
	 * so I guessed at (stride * yres/2).
	 */
	if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
	    ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {

		dev_dbg(info->dev, " ***** DSTN untested! *****\n");

		dstn_off = stride;
		if (par->rot)
			dstn_off *= hdcn >> 1;
		else
			dstn_off *= vdln >> 1;

		ldsarl = sbase + dstn_off;
	} else
		ldsarl = 0;

	iowrite32(ldsarl, par->base + LDSARL);	/* mem for lower half of DSTN */

	info->fix.line_length = stride;

	sh7760fb_check_var(&info->var, info);

	sh7760fb_blank(FB_BLANK_UNBLANK, info);	/* panel on! */

	dev_dbg(info->dev, "hdcn  : %6d htcn  : %6d\n", hdcn, htcn);
	dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
	dev_dbg(info->dev, "vdln  : %6d vtln  : %6d\n", vdln, vtln);
	dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
	dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
		(par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
	dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
		par->pd->ldpspr);
	dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
	dev_dbg(info->dev, "ldlaor: %ld\n", stride);
	dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);

	return 0;
}

static struct fb_ops sh7760fb_ops = {
	.owner = THIS_MODULE,
	.fb_blank = sh7760fb_blank,
	.fb_check_var = sh7760fb_check_var,
	.fb_setcolreg = sh7760_setcolreg,
	.fb_set_par = sh7760fb_set_par,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
};

static void sh7760fb_free_mem(struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;

	if (!info->screen_base)
		return;

	dma_free_coherent(info->dev, info->screen_size,
			  info->screen_base, par->fbdma);

	par->fbdma = 0;
	info->screen_base = NULL;
	info->screen_size = 0;
}

/* allocate the framebuffer memory. This memory must be in Area3,
 * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
 */
static int sh7760fb_alloc_mem(struct fb_info *info)
{
	struct sh7760fb_par *par = info->par;
	void *fbmem;
	unsigned long vram;
	int ret, bpp;

	if (info->screen_base)
		return 0;

	/* get color info from register value */
	ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
	if (ret) {
		printk(KERN_ERR "colinfo\n");
		return ret;
	}

	/* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
	   max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */

	vram = info->var.xres * info->var.yres;
	if (info->var.grayscale) {
		if (bpp == 1)
			vram >>= 3;
		else if (bpp == 2)
			vram >>= 2;
		else if (bpp == 4)
			vram >>= 1;
	} else if (bpp > 8)
		vram *= 2;
	if ((vram < 1) || (vram > 1024 * 2048)) {
		dev_dbg(info->dev, "too much VRAM required. Check settings\n");
		return -ENODEV;
	}

	if (vram < PAGE_SIZE)
		vram = PAGE_SIZE;

	fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);

	if (!fbmem)
		return -ENOMEM;

	if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
		sh7760fb_free_mem(info);
		dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
			"unusable for the LCDC\n", (unsigned long)par->fbdma);
		return -ENOMEM;
	}

	info->screen_base = fbmem;
	info->screen_size = vram;
	info->fix.smem_start = (unsigned long)info->screen_base;
	info->fix.smem_len = info->screen_size;

	return 0;
}

static int __devinit sh7760fb_probe(struct platform_device *pdev)
{
	struct fb_info *info;
	struct resource *res;
	struct sh7760fb_par *par;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (unlikely(res == NULL)) {
		dev_err(&pdev->dev, "invalid resource\n");
		return -EINVAL;
	}

	info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
	if (!info)
		return -ENOMEM;

	par = info->par;
	par->dev = pdev;

	par->pd = pdev->dev.platform_data;
	if (!par->pd) {
		dev_dbg(info->dev, "no display setup data!\n");
		ret = -ENODEV;
		goto out_fb;
	}

	par->ioarea = request_mem_region(res->start,
					 (res->end - res->start), pdev->name);
	if (!par->ioarea) {
		dev_err(&pdev->dev, "mmio area busy\n");
		ret = -EBUSY;
		goto out_fb;
	}

	par->base = ioremap_nocache(res->start, res->end - res->start + 1);
	if (!par->base) {
		dev_err(&pdev->dev, "cannot remap\n");
		ret = -ENODEV;
		goto out_res;
	}

	iowrite16(0, par->base + LDINTR);	/* disable vsync irq */
	par->irq = platform_get_irq(pdev, 0);
	if (par->irq >= 0) {
		ret = request_irq(par->irq, sh7760fb_irq, 0,
				  "sh7760-lcdc", &par->vsync);
		if (ret) {
			dev_err(&pdev->dev, "cannot grab IRQ\n");
			par->irq = -ENXIO;
		} else
			disable_irq_nosync(par->irq);
	}

	fb_videomode_to_var(&info->var, par->pd->def_mode);

	ret = sh7760fb_alloc_mem(info);
	if (ret) {
		dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
		goto out_unmap;
	}

	info->pseudo_palette = par->pseudo_palette;

	/* fixup color register bitpositions. These are fixed by hardware */
	info->var.red.offset = 11;
	info->var.red.length = 5;
	info->var.red.msb_right = 0;

	info->var.green.offset = 5;
	info->var.green.length = 6;
	info->var.green.msb_right = 0;

	info->var.blue.offset = 0;
	info->var.blue.length = 5;
	info->var.blue.msb_right = 0;

	info->var.transp.offset = 0;
	info->var.transp.length = 0;
	info->var.transp.msb_right = 0;

	strcpy(info->fix.id, "sh7760-lcdc");

	/* set the DON2 bit now, before cmap allocation, as it will randomize
	 * palette memory.
	 */
	iowrite16(LDCNTR_DON2, par->base + LDCNTR);
	info->fbops = &sh7760fb_ops;

	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	if (ret) {
		dev_dbg(info->dev, "Unable to allocate cmap memory\n");
		goto out_mem;
	}

	ret = register_framebuffer(info);
	if (ret < 0) {
		dev_dbg(info->dev, "cannot register fb!\n");
		goto out_cmap;
	}
	platform_set_drvdata(pdev, info);

	printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
	       pdev->name,
	       (unsigned long)par->fbdma,
	       (unsigned long)(par->fbdma + info->screen_size - 1),
	       info->screen_size >> 10);

	return 0;

out_cmap:
	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
	fb_dealloc_cmap(&info->cmap);
out_mem:
	sh7760fb_free_mem(info);
out_unmap:
	if (par->irq >= 0)
		free_irq(par->irq, &par->vsync);
	iounmap(par->base);
out_res:
	release_resource(par->ioarea);
	kfree(par->ioarea);
out_fb:
	framebuffer_release(info);
	return ret;
}

static int __devexit sh7760fb_remove(struct platform_device *dev)
{
	struct fb_info *info = platform_get_drvdata(dev);
	struct sh7760fb_par *par = info->par;

	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);
	sh7760fb_free_mem(info);
	if (par->irq >= 0)
		free_irq(par->irq, par);
	iounmap(par->base);
	release_resource(par->ioarea);
	kfree(par->ioarea);
	framebuffer_release(info);
	platform_set_drvdata(dev, NULL);

	return 0;
}

static struct platform_driver sh7760_lcdc_driver = {
	.driver = {
		   .name = "sh7760-lcdc",
		   .owner = THIS_MODULE,
		   },
	.probe = sh7760fb_probe,
	.remove = __devexit_p(sh7760fb_remove),
};

static int __init sh7760fb_init(void)
{
	return platform_driver_register(&sh7760_lcdc_driver);
}

static void __exit sh7760fb_exit(void)
{
	platform_driver_unregister(&sh7760_lcdc_driver);
}

module_init(sh7760fb_init);
module_exit(sh7760fb_exit);

MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
MODULE_LICENSE("GPL");
Commit	Line	Data
4a25e418 NI	1	/*
	2	* SH7760/SH7763 LCDC Framebuffer driver.
	3	*
	4	* (c) 2006-2008 MSC Vertriebsges.m.b.H.,
	5	* Manuel Lauss <[email protected]>
	6	* (c) 2008 Nobuhiro Iwamatsu <[email protected]>
	7	*
	8	* This file is subject to the terms and conditions of the GNU General
	9	* Public License. See the file COPYING in the main directory of this
	10	* archive for more details.
	11	*
	12	* PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
	13	*
	14	* Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
	15	* for his original source and testing!
679dc3c9 NI	16	*
679dc3c9 NI	17	* sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
4a25e418 NI	18	*/
	19
	20	#include <linux/completion.h>
	21	#include <linux/delay.h>
	22	#include <linux/dma-mapping.h>
	23	#include <linux/fb.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/io.h>
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/platform_device.h>
	29
	30	#include <asm/sh7760fb.h>
	31
	32	struct sh7760fb_par {
	33	void __iomem *base;
	34	int irq;
	35
	36	struct sh7760fb_platdata pd; / display information */
	37
	38	dma_addr_t fbdma; /* physical address */
	39
	40	int rot; /* rotation enabled? */
	41
	42	u32 pseudo_palette[16];
	43
	44	struct platform_device *dev;
	45	struct resource *ioarea;
	46	struct completion vsync; /* vsync irq event */
	47	};
	48
	49	static irqreturn_t sh7760fb_irq(int irq, void *data)
	50	{
	51	struct completion *c = data;
	52
	53	complete(c);
	54
	55	return IRQ_HANDLED;
	56	}
	57
4a25e418 NI	58	/* wait_for_lps - wait until power supply has reached a certain state. */
	59	static int wait_for_lps(struct sh7760fb_par *par, int val)
	60	{
	61	int i = 100;
	62	while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
	63	msleep(1);
	64
	65	if (i <= 0)
	66	return -ETIMEDOUT;
	67
	68	return 0;
	69	}
	70
	71	/* en/disable the LCDC */
	72	static int sh7760fb_blank(int blank, struct fb_info *info)
	73	{
	74	struct sh7760fb_par *par = info->par;
	75	struct sh7760fb_platdata *pd = par->pd;
	76	unsigned short cntr = ioread16(par->base + LDCNTR);
	77	unsigned short intr = ioread16(par->base + LDINTR);
	78	int lps;
	79
	80	if (blank == FB_BLANK_UNBLANK) {
	81	intr \|= VINT_START;
	82	cntr = LDCNTR_DON2 \| LDCNTR_DON;
	83	lps = 3;
	84	} else {
	85	intr &= ~VINT_START;
	86	cntr = LDCNTR_DON2;
	87	lps = 0;
	88	}
	89
	90	if (pd->blank)
	91	pd->blank(blank);
	92
	93	iowrite16(intr, par->base + LDINTR);
	94	iowrite16(cntr, par->base + LDCNTR);
	95
	96	return wait_for_lps(par, lps);
	97	}
	98
679dc3c9 NI	99	static int sh7760_setcolreg (u_int regno,
	100	u_int red, u_int green, u_int blue,
	101	u_int transp, struct fb_info *info)
4a25e418	102	{
679dc3c9	103	u32 *palette = info->pseudo_palette;
4a25e418	104
679dc3c9 NI	105	if (regno >= 16)
	106	return -EINVAL;
	107
	108	/* only FB_VISUAL_TRUECOLOR supported */
	109
	110	red >>= 16 - info->var.red.length;
	111	green >>= 16 - info->var.green.length;
	112	blue >>= 16 - info->var.blue.length;
	113	transp >>= 16 - info->var.transp.length;
	114
	115	palette[regno] = (red << info->var.red.offset) \|
	116	(green << info->var.green.offset) \|
	117	(blue << info->var.blue.offset) \|
	118	(transp << info->var.transp.offset);
	119
	120	return 0;
4a25e418 NI	121	}
4a25e418 NI	122
4a25e418 NI	123	static int sh7760fb_get_color_info(struct device *dev,
	124	u16 lddfr, int bpp, int gray)
	125	{
	126	int lbpp, lgray;
	127
	128	lgray = lbpp = 0;
	129
	130	switch (lddfr & LDDFR_COLOR_MASK) {
	131	case LDDFR_1BPP_MONO:
	132	lgray = 1;
	133	lbpp = 1;
	134	break;
	135	case LDDFR_2BPP_MONO:
	136	lgray = 1;
	137	lbpp = 2;
	138	break;
	139	case LDDFR_4BPP_MONO:
	140	lgray = 1;
	141	case LDDFR_4BPP:
	142	lbpp = 4;
	143	break;
	144	case LDDFR_6BPP_MONO:
	145	lgray = 1;
	146	case LDDFR_8BPP:
	147	lbpp = 8;
	148	break;
	149	case LDDFR_16BPP_RGB555:
	150	case LDDFR_16BPP_RGB565:
	151	lbpp = 16;
	152	lgray = 0;
	153	break;
	154	default:
	155	dev_dbg(dev, "unsupported LDDFR bit depth.\n");
	156	return -EINVAL;
	157	}
	158
	159	if (bpp)
	160	*bpp = lbpp;
	161	if (gray)
	162	*gray = lgray;
	163
	164	return 0;
	165	}
	166
	167	static int sh7760fb_check_var(struct fb_var_screeninfo *var,
	168	struct fb_info *info)
	169	{
	170	struct fb_fix_screeninfo *fix = &info->fix;
	171	struct sh7760fb_par *par = info->par;
	172	int ret, bpp;
	173
	174	/* get color info from register value */
	175	ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
	176	if (ret)
	177	return ret;
	178
	179	var->bits_per_pixel = bpp;
	180
	181	if ((var->grayscale) && (var->bits_per_pixel == 1))
	182	fix->visual = FB_VISUAL_MONO10;
	183	else if (var->bits_per_pixel >= 15)
	184	fix->visual = FB_VISUAL_TRUECOLOR;
	185	else
	186	fix->visual = FB_VISUAL_PSEUDOCOLOR;
187
188	/* TODO: add some more validation here */
189	return 0;
190	}
191
192	/*
193	* sh7760fb_set_par - set videomode.
194	*
195	* NOTE: The rotation, grayscale and DSTN codepaths are
196	* totally untested!
197	*/
198	static int sh7760fb_set_par(struct fb_info *info)
199	{
200	struct sh7760fb_par *par = info->par;
201	struct fb_videomode *vm = par->pd->def_mode;
202	unsigned long sbase, dstn_off, ldsarl, stride;
203	unsigned short hsynp, hsynw, htcn, hdcn;
204	unsigned short vsynp, vsynw, vtln, vdln;
205	unsigned short lddfr, ldmtr;
206	int ret, bpp, gray;
207
208	par->rot = par->pd->rotate;
209
210	/* rotate only works with xres <= 320 */
211	if (par->rot && (vm->xres > 320)) {
212	dev_dbg(info->dev, "rotation disabled due to display size\n");
213	par->rot = 0;
214	}
215
216	/* calculate LCDC reg vals from display parameters */
217	hsynp = vm->right_margin + vm->xres;
218	hsynw = vm->hsync_len;
219	htcn = vm->left_margin + hsynp + hsynw;
220	hdcn = vm->xres;
221	vsynp = vm->lower_margin + vm->yres;
222	vsynw = vm->vsync_len;
223	vtln = vm->upper_margin + vsynp + vsynw;
224	vdln = vm->yres;
225
226	/* get color info from register value */
227	ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
228	if (ret)
229	return ret;
230
231	dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
232	vdln, bpp, gray ? "grayscale" : "color",
233	par->rot ? "rotated" : "normal");
234
235	#ifdef CONFIG_CPU_LITTLE_ENDIAN
236	lddfr = par->pd->lddfr \| (1 << 8);
237	#else
238	lddfr = par->pd->lddfr & ~(1 << 8);
239	#endif
240
241	ldmtr = par->pd->ldmtr;
242
243	if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
244	ldmtr \|= LDMTR_CL1POL;
245	if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
246	ldmtr \|= LDMTR_FLMPOL;
247
248	/* shut down LCDC before changing display parameters */
249	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
250
251	iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
252	iowrite16(ldmtr, par->base + LDMTR); /* polarities */
253	iowrite16(lddfr, par->base + LDDFR); /* color/depth */
254	iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
255	iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
256	iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
257
258	/* display resolution */
259	iowrite16(((htcn >> 3) - 1) \| (((hdcn >> 3) - 1) << 8),
260	par->base + LDHCNR);
261	iowrite16(vdln - 1, par->base + LDVDLNR);
262	iowrite16(vtln - 1, par->base + LDVTLNR);
263	/* h/v sync signals */
264	iowrite16((vsynp - 1) \| ((vsynw - 1) << 12), par->base + LDVSYNR);
265	iowrite16(((hsynp >> 3) - 1) \| (((hsynw >> 3) - 1) << 12),
266	par->base + LDHSYNR);
267	/* AC modulation sig */
268	iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
269
270	stride = (par->rot) ? vtln : hdcn;
271	if (!gray)
272	stride *= (bpp + 7) >> 3;
273	else {
274	if (bpp == 1)
275	stride >>= 3;
276	else if (bpp == 2)
277	stride >>= 2;
278	else if (bpp == 4)
279	stride >>= 1;
280	/* 6 bpp == 8 bpp */
281	}
282
283	/* if rotated, stride must be power of 2 */
284	if (par->rot) {
285	unsigned long bit = 1 << 31;
286	while (bit) {
287	if (stride & bit)
288	break;
289	bit >>= 1;
290	}
291	if (stride & ~bit)
292	stride = bit << 1; /* not P-o-2, round up */
293	}
294	iowrite16(stride, par->base + LDLAOR);
295
296	/* set display mem start address */
297	sbase = (unsigned long)par->fbdma;
298	if (par->rot)
299	sbase += (hdcn - 1) * stride;
300
301	iowrite32(sbase, par->base + LDSARU);
302
303	/*
304	* for DSTN need to set address for lower half.
305	* I (mlau) don't know which address to set it to,
306	* so I guessed at (stride * yres/2).
307	*/
308	if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
309	((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
310
311	dev_dbg(info->dev, " *** DSTN untested! ***\n");
312
313	dstn_off = stride;
314	if (par->rot)
315	dstn_off *= hdcn >> 1;
316	else
317	dstn_off *= vdln >> 1;
318
319	ldsarl = sbase + dstn_off;
320	} else
321	ldsarl = 0;
322
323	iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */
324
537a1bf0 KH	325	info->fix.line_length = stride;
537a1bf0 KH	326
4a25e418 NI	327	sh7760fb_check_var(&info->var, info);
	328
	329	sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
	330
	331	dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn);
	332	dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
	333	dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln);
	334	dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
	335	dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
	336	(par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
	337	dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
	338	par->pd->ldpspr);
	339	dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
	340	dev_dbg(info->dev, "ldlaor: %ld\n", stride);
	341	dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
	342
	343	return 0;
	344	}
	345
	346	static struct fb_ops sh7760fb_ops = {
	347	.owner = THIS_MODULE,
	348	.fb_blank = sh7760fb_blank,
	349	.fb_check_var = sh7760fb_check_var,
679dc3c9	350	.fb_setcolreg = sh7760_setcolreg,
4a25e418 NI	351	.fb_set_par = sh7760fb_set_par,
	352	.fb_fillrect = cfb_fillrect,
	353	.fb_copyarea = cfb_copyarea,
	354	.fb_imageblit = cfb_imageblit,
	355	};
	356
	357	static void sh7760fb_free_mem(struct fb_info *info)
	358	{
	359	struct sh7760fb_par *par = info->par;
	360
	361	if (!info->screen_base)
	362	return;
	363
	364	dma_free_coherent(info->dev, info->screen_size,
	365	info->screen_base, par->fbdma);
	366
	367	par->fbdma = 0;
	368	info->screen_base = NULL;
	369	info->screen_size = 0;
	370	}
	371
	372	/* allocate the framebuffer memory. This memory must be in Area3,
	373	* (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
	374	*/
	375	static int sh7760fb_alloc_mem(struct fb_info *info)
	376	{
	377	struct sh7760fb_par *par = info->par;
	378	void *fbmem;
	379	unsigned long vram;
	380	int ret, bpp;
	381
	382	if (info->screen_base)
	383	return 0;
	384
	385	/* get color info from register value */
	386	ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
	387	if (ret) {
	388	printk(KERN_ERR "colinfo\n");
	389	return ret;
	390	}
	391
	392	/* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
	393	max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
	394
	395	vram = info->var.xres * info->var.yres;
	396	if (info->var.grayscale) {
	397	if (bpp == 1)
	398	vram >>= 3;
	399	else if (bpp == 2)
	400	vram >>= 2;
	401	else if (bpp == 4)
	402	vram >>= 1;
	403	} else if (bpp > 8)
	404	vram *= 2;
	405	if ((vram < 1) \|\| (vram > 1024 * 2048)) {
	406	dev_dbg(info->dev, "too much VRAM required. Check settings\n");
	407	return -ENODEV;
	408	}
	409
	410	if (vram < PAGE_SIZE)
	411	vram = PAGE_SIZE;
	412
	413	fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
	414
415	if (!fbmem)
416	return -ENOMEM;
417
418	if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
419	sh7760fb_free_mem(info);
420	dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
421	"unusable for the LCDC\n", (unsigned long)par->fbdma);
422	return -ENOMEM;
423	}
424
425	info->screen_base = fbmem;
426	info->screen_size = vram;
537a1bf0 KH	427	info->fix.smem_start = (unsigned long)info->screen_base;
537a1bf0 KH	428	info->fix.smem_len = info->screen_size;
4a25e418 NI	429
	430	return 0;
	431	}
	432
	433	static int __devinit sh7760fb_probe(struct platform_device *pdev)
	434	{
	435	struct fb_info *info;
	436	struct resource *res;
	437	struct sh7760fb_par *par;
	438	int ret;
	439
	440	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	441	if (unlikely(res == NULL)) {
	442	dev_err(&pdev->dev, "invalid resource\n");
	443	return -EINVAL;
	444	}
	445
	446	info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
	447	if (!info)
	448	return -ENOMEM;
	449
	450	par = info->par;
	451	par->dev = pdev;
	452
	453	par->pd = pdev->dev.platform_data;
	454	if (!par->pd) {
	455	dev_dbg(info->dev, "no display setup data!\n");
	456	ret = -ENODEV;
	457	goto out_fb;
	458	}
	459
	460	par->ioarea = request_mem_region(res->start,
	461	(res->end - res->start), pdev->name);
	462	if (!par->ioarea) {
	463	dev_err(&pdev->dev, "mmio area busy\n");
	464	ret = -EBUSY;
	465	goto out_fb;
	466	}
	467
	468	par->base = ioremap_nocache(res->start, res->end - res->start + 1);
	469	if (!par->base) {
	470	dev_err(&pdev->dev, "cannot remap\n");
	471	ret = -ENODEV;
	472	goto out_res;
	473	}
	474
	475	iowrite16(0, par->base + LDINTR); /* disable vsync irq */
	476	par->irq = platform_get_irq(pdev, 0);
	477	if (par->irq >= 0) {
	478	ret = request_irq(par->irq, sh7760fb_irq, 0,
	479	"sh7760-lcdc", &par->vsync);
	480	if (ret) {
	481	dev_err(&pdev->dev, "cannot grab IRQ\n");
	482	par->irq = -ENXIO;
	483	} else
	484	disable_irq_nosync(par->irq);
	485	}
	486
	487	fb_videomode_to_var(&info->var, par->pd->def_mode);
	488
	489	ret = sh7760fb_alloc_mem(info);
	490	if (ret) {
	491	dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
	492	goto out_unmap;
493	}
494
495	info->pseudo_palette = par->pseudo_palette;
496
497	/* fixup color register bitpositions. These are fixed by hardware */
498	info->var.red.offset = 11;
499	info->var.red.length = 5;
500	info->var.red.msb_right = 0;
501
502	info->var.green.offset = 5;
503	info->var.green.length = 6;
504	info->var.green.msb_right = 0;
505
506	info->var.blue.offset = 0;
507	info->var.blue.length = 5;
508	info->var.blue.msb_right = 0;
509
510	info->var.transp.offset = 0;
511	info->var.transp.length = 0;
512	info->var.transp.msb_right = 0;
513
537a1bf0 KH	514	strcpy(info->fix.id, "sh7760-lcdc");
537a1bf0 KH	515
4a25e418 NI	516	/* set the DON2 bit now, before cmap allocation, as it will randomize
	517	* palette memory.
	518	*/
	519	iowrite16(LDCNTR_DON2, par->base + LDCNTR);
	520	info->fbops = &sh7760fb_ops;
	521
	522	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	523	if (ret) {
	524	dev_dbg(info->dev, "Unable to allocate cmap memory\n");
	525	goto out_mem;
	526	}
	527
	528	ret = register_framebuffer(info);
	529	if (ret < 0) {
	530	dev_dbg(info->dev, "cannot register fb!\n");
	531	goto out_cmap;
	532	}
	533	platform_set_drvdata(pdev, info);
	534
	535	printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
	536	pdev->name,
	537	(unsigned long)par->fbdma,
	538	(unsigned long)(par->fbdma + info->screen_size - 1),
	539	info->screen_size >> 10);
	540
	541	return 0;
	542
	543	out_cmap:
	544	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
	545	fb_dealloc_cmap(&info->cmap);
	546	out_mem:
	547	sh7760fb_free_mem(info);
	548	out_unmap:
	549	if (par->irq >= 0)
	550	free_irq(par->irq, &par->vsync);
	551	iounmap(par->base);
	552	out_res:
	553	release_resource(par->ioarea);
	554	kfree(par->ioarea);
	555	out_fb:
	556	framebuffer_release(info);
	557	return ret;
	558	}
	559
	560	static int __devexit sh7760fb_remove(struct platform_device *dev)
	561	{
	562	struct fb_info *info = platform_get_drvdata(dev);
	563	struct sh7760fb_par *par = info->par;
	564
	565	sh7760fb_blank(FB_BLANK_POWERDOWN, info);
	566	unregister_framebuffer(info);
	567	fb_dealloc_cmap(&info->cmap);
	568	sh7760fb_free_mem(info);
	569	if (par->irq >= 0)
	570	free_irq(par->irq, par);
	571	iounmap(par->base);
	572	release_resource(par->ioarea);
	573	kfree(par->ioarea);
	574	framebuffer_release(info);
	575	platform_set_drvdata(dev, NULL);
	576
	577	return 0;
	578	}
	579
580	static struct platform_driver sh7760_lcdc_driver = {
581	.driver = {
582	.name = "sh7760-lcdc",
583	.owner = THIS_MODULE,
584	},
585	.probe = sh7760fb_probe,
586	.remove = __devexit_p(sh7760fb_remove),
587	};
588
589	static int __init sh7760fb_init(void)
590	{
591	return platform_driver_register(&sh7760_lcdc_driver);
592	}
593
594	static void __exit sh7760fb_exit(void)
595	{
596	platform_driver_unregister(&sh7760_lcdc_driver);
597	}
598
599	module_init(sh7760fb_init);
600	module_exit(sh7760fb_exit);
601
602	MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
603	MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
604	MODULE_LICENSE("GPL");