[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / goldfishfb.c

/*
 * Copyright (C) 2007 Google, Inc.
 * Copyright (C) 2012 Intel, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>

enum {
	FB_GET_WIDTH        = 0x00,
	FB_GET_HEIGHT       = 0x04,
	FB_INT_STATUS       = 0x08,
	FB_INT_ENABLE       = 0x0c,
	FB_SET_BASE         = 0x10,
	FB_SET_ROTATION     = 0x14,
	FB_SET_BLANK        = 0x18,
	FB_GET_PHYS_WIDTH   = 0x1c,
	FB_GET_PHYS_HEIGHT  = 0x20,

	FB_INT_VSYNC             = 1U << 0,
	FB_INT_BASE_UPDATE_DONE  = 1U << 1
};

struct goldfish_fb {
	void __iomem *reg_base;
	int irq;
	spinlock_t lock;
	wait_queue_head_t wait;
	int base_update_count;
	int rotation;
	struct fb_info fb;
	u32 cmap[16];
};

static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
{
	unsigned long irq_flags;
	struct goldfish_fb *fb = dev_id;
	u32 status;

	spin_lock_irqsave(&fb->lock, irq_flags);
	status = readl(fb->reg_base + FB_INT_STATUS);
	if (status & FB_INT_BASE_UPDATE_DONE) {
		fb->base_update_count++;
		wake_up(&fb->wait);
	}
	spin_unlock_irqrestore(&fb->lock, irq_flags);
	return status ? IRQ_HANDLED : IRQ_NONE;
}

static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
{
	unsigned int mask = (1 << bf->length) - 1;

	return (val >> (16 - bf->length) & mask) << bf->offset;
}

static int
goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
		 unsigned int blue, unsigned int transp, struct fb_info *info)
{
	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);

	if (regno < 16) {
		fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
				  convert_bitfield(blue, &fb->fb.var.blue) |
				  convert_bitfield(green, &fb->fb.var.green) |
				  convert_bitfield(red, &fb->fb.var.red);
		return 0;
	} else {
		return 1;
	}
}

static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
							struct fb_info *info)
{
	if ((var->rotate & 1) != (info->var.rotate & 1)) {
		if ((var->xres != info->var.yres) ||
				(var->yres != info->var.xres) ||
				(var->xres_virtual != info->var.yres) ||
				(var->yres_virtual > info->var.xres * 2) ||
				(var->yres_virtual < info->var.xres)) {
			return -EINVAL;
		}
	} else {
		if ((var->xres != info->var.xres) ||
		   (var->yres != info->var.yres) ||
		   (var->xres_virtual != info->var.xres) ||
		   (var->yres_virtual > info->var.yres * 2) ||
		   (var->yres_virtual < info->var.yres)) {
			return -EINVAL;
		}
	}
	if ((var->xoffset != info->var.xoffset) ||
			(var->bits_per_pixel != info->var.bits_per_pixel) ||
			(var->grayscale != info->var.grayscale)) {
		return -EINVAL;
	}
	return 0;
}

static int goldfish_fb_set_par(struct fb_info *info)
{
	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
	if (fb->rotation != fb->fb.var.rotate) {
		info->fix.line_length = info->var.xres * 2;
		fb->rotation = fb->fb.var.rotate;
		writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
	}
	return 0;
}


static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
							struct fb_info *info)
{
	unsigned long irq_flags;
	int base_update_count;
	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);

	spin_lock_irqsave(&fb->lock, irq_flags);
	base_update_count = fb->base_update_count;
	writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
						fb->reg_base + FB_SET_BASE);
	spin_unlock_irqrestore(&fb->lock, irq_flags);
	wait_event_timeout(fb->wait,
			fb->base_update_count != base_update_count, HZ / 15);
	if (fb->base_update_count == base_update_count)
		pr_err("goldfish_fb_pan_display: timeout waiting for base update\n");
	return 0;
}

static int goldfish_fb_blank(int blank, struct fb_info *info)
{
	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
	switch (blank) {
	case FB_BLANK_NORMAL:
		writel(1, fb->reg_base + FB_SET_BLANK);
		break;
	case FB_BLANK_UNBLANK:
		writel(0, fb->reg_base + FB_SET_BLANK);
		break;
	}
	return 0;
}

static struct fb_ops goldfish_fb_ops = {
	.owner          = THIS_MODULE,
	.fb_check_var   = goldfish_fb_check_var,
	.fb_set_par     = goldfish_fb_set_par,
	.fb_setcolreg   = goldfish_fb_setcolreg,
	.fb_pan_display = goldfish_fb_pan_display,
	.fb_blank	= goldfish_fb_blank,
	.fb_fillrect    = cfb_fillrect,
	.fb_copyarea    = cfb_copyarea,
	.fb_imageblit   = cfb_imageblit,
};


static int goldfish_fb_probe(struct platform_device *pdev)
{
	int ret;
	struct resource *r;
	struct goldfish_fb *fb;
	size_t framesize;
	u32 width, height;
	dma_addr_t fbpaddr;

	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
	if (fb == NULL) {
		ret = -ENOMEM;
		goto err_fb_alloc_failed;
	}
	spin_lock_init(&fb->lock);
	init_waitqueue_head(&fb->wait);
	platform_set_drvdata(pdev, fb);

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (r == NULL) {
		ret = -ENODEV;
		goto err_no_io_base;
	}
	fb->reg_base = ioremap(r->start, PAGE_SIZE);
	if (fb->reg_base == NULL) {
		ret = -ENOMEM;
		goto err_no_io_base;
	}

	fb->irq = platform_get_irq(pdev, 0);
	if (fb->irq <= 0) {
		ret = -ENODEV;
		goto err_no_irq;
	}

	width = readl(fb->reg_base + FB_GET_WIDTH);
	height = readl(fb->reg_base + FB_GET_HEIGHT);

	fb->fb.fbops		= &goldfish_fb_ops;
	fb->fb.flags		= FBINFO_FLAG_DEFAULT;
	fb->fb.pseudo_palette	= fb->cmap;
	fb->fb.fix.type		= FB_TYPE_PACKED_PIXELS;
	fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
	fb->fb.fix.line_length = width * 2;
	fb->fb.fix.accel	= FB_ACCEL_NONE;
	fb->fb.fix.ypanstep = 1;

	fb->fb.var.xres		= width;
	fb->fb.var.yres		= height;
	fb->fb.var.xres_virtual	= width;
	fb->fb.var.yres_virtual	= height * 2;
	fb->fb.var.bits_per_pixel = 16;
	fb->fb.var.activate	= FB_ACTIVATE_NOW;
	fb->fb.var.height	= readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
	fb->fb.var.width	= readl(fb->reg_base + FB_GET_PHYS_WIDTH);
	fb->fb.var.pixclock	= 10000;

	fb->fb.var.red.offset = 11;
	fb->fb.var.red.length = 5;
	fb->fb.var.green.offset = 5;
	fb->fb.var.green.length = 6;
	fb->fb.var.blue.offset = 0;
	fb->fb.var.blue.length = 5;

	framesize = width * height * 2 * 2;
	fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
						&pdev->dev, framesize,
						&fbpaddr, GFP_KERNEL);
	pr_debug("allocating frame buffer %d * %d, got %p\n",
					width, height, fb->fb.screen_base);
	if (fb->fb.screen_base == NULL) {
		ret = -ENOMEM;
		goto err_alloc_screen_base_failed;
	}
	fb->fb.fix.smem_start = fbpaddr;
	fb->fb.fix.smem_len = framesize;

	ret = fb_set_var(&fb->fb, &fb->fb.var);
	if (ret)
		goto err_fb_set_var_failed;

	ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
							pdev->name, fb);
	if (ret)
		goto err_request_irq_failed;

	writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
	goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */

	ret = register_framebuffer(&fb->fb);
	if (ret)
		goto err_register_framebuffer_failed;
	return 0;

err_register_framebuffer_failed:
	free_irq(fb->irq, fb);
err_request_irq_failed:
err_fb_set_var_failed:
	dma_free_coherent(&pdev->dev, framesize,
				(void *)fb->fb.screen_base,
				fb->fb.fix.smem_start);
err_alloc_screen_base_failed:
err_no_irq:
	iounmap(fb->reg_base);
err_no_io_base:
	kfree(fb);
err_fb_alloc_failed:
	return ret;
}

static int goldfish_fb_remove(struct platform_device *pdev)
{
	size_t framesize;
	struct goldfish_fb *fb = platform_get_drvdata(pdev);

	framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
	unregister_framebuffer(&fb->fb);
	free_irq(fb->irq, fb);

	dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
						fb->fb.fix.smem_start);
	iounmap(fb->reg_base);
	return 0;
}


static struct platform_driver goldfish_fb_driver = {
	.probe		= goldfish_fb_probe,
	.remove		= goldfish_fb_remove,
	.driver = {
		.name = "goldfish_fb"
	}
};

module_platform_driver(goldfish_fb_driver);

MODULE_LICENSE("GPL v2");
Commit	Line	Data
c289ba2d AH	1	/*
	2	* Copyright (C) 2007 Google, Inc.
	3	* Copyright (C) 2012 Intel, Inc.
	4	*
	5	* This software is licensed under the terms of the GNU General Public
	6	* License version 2, as published by the Free Software Foundation, and
	7	* may be copied, distributed, and modified under those terms.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/kernel.h>
	18	#include <linux/dma-mapping.h>
	19	#include <linux/errno.h>
	20	#include <linux/string.h>
	21	#include <linux/slab.h>
	22	#include <linux/delay.h>
	23	#include <linux/mm.h>
	24	#include <linux/fb.h>
	25	#include <linux/init.h>
	26	#include <linux/interrupt.h>
	27	#include <linux/ioport.h>
	28	#include <linux/platform_device.h>
	29
	30	enum {
	31	FB_GET_WIDTH = 0x00,
	32	FB_GET_HEIGHT = 0x04,
	33	FB_INT_STATUS = 0x08,
	34	FB_INT_ENABLE = 0x0c,
	35	FB_SET_BASE = 0x10,
	36	FB_SET_ROTATION = 0x14,
	37	FB_SET_BLANK = 0x18,
	38	FB_GET_PHYS_WIDTH = 0x1c,
	39	FB_GET_PHYS_HEIGHT = 0x20,
	40
	41	FB_INT_VSYNC = 1U << 0,
	42	FB_INT_BASE_UPDATE_DONE = 1U << 1
	43	};
	44
	45	struct goldfish_fb {
	46	void __iomem *reg_base;
	47	int irq;
	48	spinlock_t lock;
	49	wait_queue_head_t wait;
	50	int base_update_count;
	51	int rotation;
	52	struct fb_info fb;
	53	u32 cmap[16];
	54	};
	55
	56	static irqreturn_t goldfish_fb_interrupt(int irq, void *dev_id)
	57	{
	58	unsigned long irq_flags;
	59	struct goldfish_fb *fb = dev_id;
	60	u32 status;
	61
	62	spin_lock_irqsave(&fb->lock, irq_flags);
	63	status = readl(fb->reg_base + FB_INT_STATUS);
	64	if (status & FB_INT_BASE_UPDATE_DONE) {
65	fb->base_update_count++;
66	wake_up(&fb->wait);
67	}
68	spin_unlock_irqrestore(&fb->lock, irq_flags);
69	return status ? IRQ_HANDLED : IRQ_NONE;
70	}
71
72	static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
73	{
74	unsigned int mask = (1 << bf->length) - 1;
75
76	return (val >> (16 - bf->length) & mask) << bf->offset;
77	}
78
79	static int
80	goldfish_fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
81	unsigned int blue, unsigned int transp, struct fb_info *info)
82	{
83	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
84
85	if (regno < 16) {
86	fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) \|
87	convert_bitfield(blue, &fb->fb.var.blue) \|
88	convert_bitfield(green, &fb->fb.var.green) \|
89	convert_bitfield(red, &fb->fb.var.red);
90	return 0;
91	} else {
92	return 1;
93	}
94	}
95
96	static int goldfish_fb_check_var(struct fb_var_screeninfo *var,
97	struct fb_info *info)
98	{
99	if ((var->rotate & 1) != (info->var.rotate & 1)) {
100	if ((var->xres != info->var.yres) \|\|
101	(var->yres != info->var.xres) \|\|
102	(var->xres_virtual != info->var.yres) \|\|
103	(var->yres_virtual > info->var.xres * 2) \|\|
104	(var->yres_virtual < info->var.xres)) {
105	return -EINVAL;
106	}
107	} else {
108	if ((var->xres != info->var.xres) \|\|
109	(var->yres != info->var.yres) \|\|
110	(var->xres_virtual != info->var.xres) \|\|
111	(var->yres_virtual > info->var.yres * 2) \|\|
112	(var->yres_virtual < info->var.yres)) {
113	return -EINVAL;
114	}
115	}
116	if ((var->xoffset != info->var.xoffset) \|\|
117	(var->bits_per_pixel != info->var.bits_per_pixel) \|\|
118	(var->grayscale != info->var.grayscale)) {
119	return -EINVAL;
120	}
121	return 0;
122	}
123
124	static int goldfish_fb_set_par(struct fb_info *info)
125	{
126	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
127	if (fb->rotation != fb->fb.var.rotate) {
128	info->fix.line_length = info->var.xres * 2;
129	fb->rotation = fb->fb.var.rotate;
130	writel(fb->rotation, fb->reg_base + FB_SET_ROTATION);
131	}
132	return 0;
133	}
134
135
136	static int goldfish_fb_pan_display(struct fb_var_screeninfo *var,
137	struct fb_info *info)
138	{
139	unsigned long irq_flags;
140	int base_update_count;
141	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
142
143	spin_lock_irqsave(&fb->lock, irq_flags);
144	base_update_count = fb->base_update_count;
145	writel(fb->fb.fix.smem_start + fb->fb.var.xres * 2 * var->yoffset,
146	fb->reg_base + FB_SET_BASE);
147	spin_unlock_irqrestore(&fb->lock, irq_flags);
148	wait_event_timeout(fb->wait,
149	fb->base_update_count != base_update_count, HZ / 15);
150	if (fb->base_update_count == base_update_count)
07f42258	151	pr_err("goldfish_fb_pan_display: timeout waiting for base update\n");
c289ba2d AH	152	return 0;
	153	}
	154
	155	static int goldfish_fb_blank(int blank, struct fb_info *info)
	156	{
	157	struct goldfish_fb *fb = container_of(info, struct goldfish_fb, fb);
	158	switch (blank) {
	159	case FB_BLANK_NORMAL:
	160	writel(1, fb->reg_base + FB_SET_BLANK);
	161	break;
	162	case FB_BLANK_UNBLANK:
	163	writel(0, fb->reg_base + FB_SET_BLANK);
	164	break;
	165	}
	166	return 0;
	167	}
	168
	169	static struct fb_ops goldfish_fb_ops = {
	170	.owner = THIS_MODULE,
	171	.fb_check_var = goldfish_fb_check_var,
	172	.fb_set_par = goldfish_fb_set_par,
	173	.fb_setcolreg = goldfish_fb_setcolreg,
	174	.fb_pan_display = goldfish_fb_pan_display,
	175	.fb_blank = goldfish_fb_blank,
	176	.fb_fillrect = cfb_fillrect,
	177	.fb_copyarea = cfb_copyarea,
	178	.fb_imageblit = cfb_imageblit,
	179	};
	180
	181
	182	static int goldfish_fb_probe(struct platform_device *pdev)
	183	{
	184	int ret;
	185	struct resource *r;
	186	struct goldfish_fb *fb;
	187	size_t framesize;
	188	u32 width, height;
	189	dma_addr_t fbpaddr;
	190
	191	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
	192	if (fb == NULL) {
	193	ret = -ENOMEM;
	194	goto err_fb_alloc_failed;
	195	}
	196	spin_lock_init(&fb->lock);
	197	init_waitqueue_head(&fb->wait);
	198	platform_set_drvdata(pdev, fb);
	199
	200	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	201	if (r == NULL) {
	202	ret = -ENODEV;
	203	goto err_no_io_base;
	204	}
	205	fb->reg_base = ioremap(r->start, PAGE_SIZE);
	206	if (fb->reg_base == NULL) {
	207	ret = -ENOMEM;
	208	goto err_no_io_base;
	209	}
	210
	211	fb->irq = platform_get_irq(pdev, 0);
	212	if (fb->irq <= 0) {
	213	ret = -ENODEV;
	214	goto err_no_irq;
	215	}
216
217	width = readl(fb->reg_base + FB_GET_WIDTH);
218	height = readl(fb->reg_base + FB_GET_HEIGHT);
219
220	fb->fb.fbops = &goldfish_fb_ops;
221	fb->fb.flags = FBINFO_FLAG_DEFAULT;
222	fb->fb.pseudo_palette = fb->cmap;
223	fb->fb.fix.type = FB_TYPE_PACKED_PIXELS;
224	fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
225	fb->fb.fix.line_length = width * 2;
226	fb->fb.fix.accel = FB_ACCEL_NONE;
227	fb->fb.fix.ypanstep = 1;
228
229	fb->fb.var.xres = width;
230	fb->fb.var.yres = height;
231	fb->fb.var.xres_virtual = width;
232	fb->fb.var.yres_virtual = height * 2;
233	fb->fb.var.bits_per_pixel = 16;
234	fb->fb.var.activate = FB_ACTIVATE_NOW;
235	fb->fb.var.height = readl(fb->reg_base + FB_GET_PHYS_HEIGHT);
236	fb->fb.var.width = readl(fb->reg_base + FB_GET_PHYS_WIDTH);
237	fb->fb.var.pixclock = 10000;
238
239	fb->fb.var.red.offset = 11;
240	fb->fb.var.red.length = 5;
241	fb->fb.var.green.offset = 5;
242	fb->fb.var.green.length = 6;
243	fb->fb.var.blue.offset = 0;
244	fb->fb.var.blue.length = 5;
245
246	framesize = width * height * 2 * 2;
247	fb->fb.screen_base = (char __force __iomem *)dma_alloc_coherent(
248	&pdev->dev, framesize,
249	&fbpaddr, GFP_KERNEL);
250	pr_debug("allocating frame buffer %d * %d, got %p\n",
251	width, height, fb->fb.screen_base);
252	if (fb->fb.screen_base == NULL) {
253	ret = -ENOMEM;
254	goto err_alloc_screen_base_failed;
255	}
256	fb->fb.fix.smem_start = fbpaddr;
257	fb->fb.fix.smem_len = framesize;
258
259	ret = fb_set_var(&fb->fb, &fb->fb.var);
260	if (ret)
261	goto err_fb_set_var_failed;
262
263	ret = request_irq(fb->irq, goldfish_fb_interrupt, IRQF_SHARED,
264	pdev->name, fb);
265	if (ret)
266	goto err_request_irq_failed;
267
268	writel(FB_INT_BASE_UPDATE_DONE, fb->reg_base + FB_INT_ENABLE);
269	goldfish_fb_pan_display(&fb->fb.var, &fb->fb); /* updates base */
270
271	ret = register_framebuffer(&fb->fb);
272	if (ret)
273	goto err_register_framebuffer_failed;
274	return 0;
275
276	err_register_framebuffer_failed:
277	free_irq(fb->irq, fb);
278	err_request_irq_failed:
279	err_fb_set_var_failed:
280	dma_free_coherent(&pdev->dev, framesize,
281	(void *)fb->fb.screen_base,
282	fb->fb.fix.smem_start);
283	err_alloc_screen_base_failed:
284	err_no_irq:
285	iounmap(fb->reg_base);
286	err_no_io_base:
287	kfree(fb);
288	err_fb_alloc_failed:
289	return ret;
290	}
291
292	static int goldfish_fb_remove(struct platform_device *pdev)
293	{
294	size_t framesize;
295	struct goldfish_fb *fb = platform_get_drvdata(pdev);
296
297	framesize = fb->fb.var.xres_virtual * fb->fb.var.yres_virtual * 2;
298	unregister_framebuffer(&fb->fb);
299	free_irq(fb->irq, fb);
300
301	dma_free_coherent(&pdev->dev, framesize, (void *)fb->fb.screen_base,
302	fb->fb.fix.smem_start);
303	iounmap(fb->reg_base);
304	return 0;
305	}
306
307
308	static struct platform_driver goldfish_fb_driver = {
309	.probe = goldfish_fb_probe,
310	.remove = goldfish_fb_remove,
311	.driver = {
312	.name = "goldfish_fb"
313	}
314	};
315
316	module_platform_driver(goldfish_fb_driver);
317
318	MODULE_LICENSE("GPL v2");