linux/drivers/video/vt8500lcdfb.c
Laurent Pinchart 8f0246d628 vt8500lcdfb: use display information in info not in var for panning
We must not use any information in the passed var besides xoffset,
yoffset and vmode as otherwise applications might abuse it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2011-08-19 10:36:12 +02:00

475 lines
12 KiB
C

/*
* linux/drivers/video/vt8500lcdfb.c
*
* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
*
* Based on skeletonfb.c and pxafb.c
*
* 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/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/wait.h>
#include <mach/vt8500fb.h>
#include "vt8500lcdfb.h"
#include "wmt_ge_rops.h"
#define to_vt8500lcd_info(__info) container_of(__info, \
struct vt8500lcd_info, fb)
static int vt8500lcd_set_par(struct fb_info *info)
{
struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
int reg_bpp = 5; /* 16bpp */
int i;
unsigned long control0;
if (!fbi)
return -EINVAL;
if (info->var.bits_per_pixel <= 8) {
/* palettized */
info->var.red.offset = 0;
info->var.red.length = info->var.bits_per_pixel;
info->var.red.msb_right = 0;
info->var.green.offset = 0;
info->var.green.length = info->var.bits_per_pixel;
info->var.green.msb_right = 0;
info->var.blue.offset = 0;
info->var.blue.length = info->var.bits_per_pixel;
info->var.blue.msb_right = 0;
info->var.transp.offset = 0;
info->var.transp.length = 0;
info->var.transp.msb_right = 0;
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
info->fix.line_length = info->var.xres_virtual /
(8/info->var.bits_per_pixel);
} else {
/* non-palettized */
info->var.transp.offset = 0;
info->var.transp.length = 0;
info->var.transp.msb_right = 0;
if (info->var.bits_per_pixel == 16) {
/* RGB565 */
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;
} else {
/* Equal depths per channel */
info->var.red.offset = info->var.bits_per_pixel
* 2 / 3;
info->var.red.length = info->var.bits_per_pixel / 3;
info->var.red.msb_right = 0;
info->var.green.offset = info->var.bits_per_pixel / 3;
info->var.green.length = info->var.bits_per_pixel / 3;
info->var.green.msb_right = 0;
info->var.blue.offset = 0;
info->var.blue.length = info->var.bits_per_pixel / 3;
info->var.blue.msb_right = 0;
}
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.line_length = info->var.bits_per_pixel > 16 ?
info->var.xres_virtual << 2 :
info->var.xres_virtual << 1;
}
for (i = 0; i < 8; i++) {
if (bpp_values[i] == info->var.bits_per_pixel) {
reg_bpp = i;
continue;
}
}
control0 = readl(fbi->regbase) & ~0xf;
writel(0, fbi->regbase);
while (readl(fbi->regbase + 0x38) & 0x10)
/* wait */;
writel((((info->var.hsync_len - 1) & 0x3f) << 26)
| ((info->var.left_margin & 0xff) << 18)
| (((info->var.xres - 1) & 0x3ff) << 8)
| (info->var.right_margin & 0xff), fbi->regbase + 0x4);
writel((((info->var.vsync_len - 1) & 0x3f) << 26)
| ((info->var.upper_margin & 0xff) << 18)
| (((info->var.yres - 1) & 0x3ff) << 8)
| (info->var.lower_margin & 0xff), fbi->regbase + 0x8);
writel((((info->var.yres - 1) & 0x400) << 2)
| ((info->var.xres - 1) & 0x400), fbi->regbase + 0x10);
writel(0x80000000, fbi->regbase + 0x20);
writel(control0 | (reg_bpp << 1) | 0x100, fbi->regbase);
return 0;
}
static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
{
chan &= 0xffff;
chan >>= 16 - bf->length;
return chan << bf->offset;
}
static int vt8500lcd_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info) {
struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
int ret = 1;
unsigned int val;
if (regno >= 256)
return -EINVAL;
if (info->var.grayscale)
red = green = blue =
(19595 * red + 38470 * green + 7471 * blue) >> 16;
switch (fbi->fb.fix.visual) {
case FB_VISUAL_TRUECOLOR:
if (regno < 16) {
u32 *pal = fbi->fb.pseudo_palette;
val = chan_to_field(red, &fbi->fb.var.red);
val |= chan_to_field(green, &fbi->fb.var.green);
val |= chan_to_field(blue, &fbi->fb.var.blue);
pal[regno] = val;
ret = 0;
}
break;
case FB_VISUAL_STATIC_PSEUDOCOLOR:
case FB_VISUAL_PSEUDOCOLOR:
writew((red & 0xf800)
| ((green >> 5) & 0x7e0)
| ((blue >> 11) & 0x1f),
fbi->palette_cpu + sizeof(u16) * regno);
break;
}
return ret;
}
static int vt8500lcd_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
int ret = 0;
struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
if (cmd == FBIO_WAITFORVSYNC) {
/* Unmask End of Frame interrupt */
writel(0xffffffff ^ (1 << 3), fbi->regbase + 0x3c);
ret = wait_event_interruptible_timeout(fbi->wait,
readl(fbi->regbase + 0x38) & (1 << 3), HZ / 10);
/* Mask back to reduce unwanted interrupt traffic */
writel(0xffffffff, fbi->regbase + 0x3c);
if (ret < 0)
return ret;
if (ret == 0)
return -ETIMEDOUT;
}
return ret;
}
static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
unsigned pixlen = info->fix.line_length / info->var.xres_virtual;
unsigned off = pixlen * var->xoffset
+ info->fix.line_length * var->yoffset;
struct vt8500lcd_info *fbi = to_vt8500lcd_info(info);
writel((1 << 31)
| (((info->var.xres_virtual - info->var.xres) * pixlen / 4) << 20)
| (off >> 2), fbi->regbase + 0x20);
return 0;
}
/*
* vt8500lcd_blank():
* Blank the display by setting all palette values to zero. Note,
* True Color modes do not really use the palette, so this will not
* blank the display in all modes.
*/
static int vt8500lcd_blank(int blank, struct fb_info *info)
{
int i;
switch (blank) {
case FB_BLANK_POWERDOWN:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_NORMAL:
if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
for (i = 0; i < 256; i++)
vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
case FB_BLANK_UNBLANK:
if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
fb_set_cmap(&info->cmap, info);
}
return 0;
}
static struct fb_ops vt8500lcd_ops = {
.owner = THIS_MODULE,
.fb_set_par = vt8500lcd_set_par,
.fb_setcolreg = vt8500lcd_setcolreg,
.fb_fillrect = wmt_ge_fillrect,
.fb_copyarea = wmt_ge_copyarea,
.fb_imageblit = sys_imageblit,
.fb_sync = wmt_ge_sync,
.fb_ioctl = vt8500lcd_ioctl,
.fb_pan_display = vt8500lcd_pan_display,
.fb_blank = vt8500lcd_blank,
};
static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)
{
struct vt8500lcd_info *fbi = dev_id;
if (readl(fbi->regbase + 0x38) & (1 << 3))
wake_up_interruptible(&fbi->wait);
writel(0xffffffff, fbi->regbase + 0x38);
return IRQ_HANDLED;
}
static int __devinit vt8500lcd_probe(struct platform_device *pdev)
{
struct vt8500lcd_info *fbi;
struct resource *res;
struct vt8500fb_platform_data *pdata = pdev->dev.platform_data;
void *addr;
int irq, ret;
ret = -ENOMEM;
fbi = NULL;
fbi = kzalloc(sizeof(struct vt8500lcd_info) + sizeof(u32) * 16,
GFP_KERNEL);
if (!fbi) {
dev_err(&pdev->dev, "Failed to initialize framebuffer device\n");
ret = -ENOMEM;
goto failed;
}
strcpy(fbi->fb.fix.id, "VT8500 LCD");
fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
fbi->fb.fix.xpanstep = 0;
fbi->fb.fix.ypanstep = 1;
fbi->fb.fix.ywrapstep = 0;
fbi->fb.fix.accel = FB_ACCEL_NONE;
fbi->fb.var.nonstd = 0;
fbi->fb.var.activate = FB_ACTIVATE_NOW;
fbi->fb.var.height = -1;
fbi->fb.var.width = -1;
fbi->fb.var.vmode = FB_VMODE_NONINTERLACED;
fbi->fb.fbops = &vt8500lcd_ops;
fbi->fb.flags = FBINFO_DEFAULT
| FBINFO_HWACCEL_COPYAREA
| FBINFO_HWACCEL_FILLRECT
| FBINFO_HWACCEL_YPAN
| FBINFO_VIRTFB
| FBINFO_PARTIAL_PAN_OK;
fbi->fb.node = -1;
addr = fbi;
addr = addr + sizeof(struct vt8500lcd_info);
fbi->fb.pseudo_palette = addr;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no I/O memory resource defined\n");
ret = -ENODEV;
goto failed_fbi;
}
res = request_mem_region(res->start, resource_size(res), "vt8500lcd");
if (res == NULL) {
dev_err(&pdev->dev, "failed to request I/O memory\n");
ret = -EBUSY;
goto failed_fbi;
}
fbi->regbase = ioremap(res->start, resource_size(res));
if (fbi->regbase == NULL) {
dev_err(&pdev->dev, "failed to map I/O memory\n");
ret = -EBUSY;
goto failed_free_res;
}
fbi->fb.fix.smem_start = pdata->video_mem_phys;
fbi->fb.fix.smem_len = pdata->video_mem_len;
fbi->fb.screen_base = pdata->video_mem_virt;
fbi->palette_size = PAGE_ALIGN(512);
fbi->palette_cpu = dma_alloc_coherent(&pdev->dev,
fbi->palette_size,
&fbi->palette_phys,
GFP_KERNEL);
if (fbi->palette_cpu == NULL) {
dev_err(&pdev->dev, "Failed to allocate palette buffer\n");
ret = -ENOMEM;
goto failed_free_io;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no IRQ defined\n");
ret = -ENODEV;
goto failed_free_palette;
}
ret = request_irq(irq, vt8500lcd_handle_irq, IRQF_DISABLED, "LCD", fbi);
if (ret) {
dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
ret = -EBUSY;
goto failed_free_palette;
}
init_waitqueue_head(&fbi->wait);
if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
dev_err(&pdev->dev, "Failed to allocate color map\n");
ret = -ENOMEM;
goto failed_free_irq;
}
fb_videomode_to_var(&fbi->fb.var, &pdata->mode);
fbi->fb.var.bits_per_pixel = pdata->bpp;
fbi->fb.var.xres_virtual = pdata->xres_virtual;
fbi->fb.var.yres_virtual = pdata->yres_virtual;
ret = vt8500lcd_set_par(&fbi->fb);
if (ret) {
dev_err(&pdev->dev, "Failed to set parameters\n");
goto failed_free_cmap;
}
writel(fbi->fb.fix.smem_start >> 22, fbi->regbase + 0x1c);
writel((fbi->palette_phys & 0xfffffe00) | 1, fbi->regbase + 0x18);
platform_set_drvdata(pdev, fbi);
ret = register_framebuffer(&fbi->fb);
if (ret < 0) {
dev_err(&pdev->dev,
"Failed to register framebuffer device: %d\n", ret);
goto failed_free_cmap;
}
/*
* Ok, now enable the LCD controller
*/
writel(readl(fbi->regbase) | 1, fbi->regbase);
return 0;
failed_free_cmap:
if (fbi->fb.cmap.len)
fb_dealloc_cmap(&fbi->fb.cmap);
failed_free_irq:
free_irq(irq, fbi);
failed_free_palette:
dma_free_coherent(&pdev->dev, fbi->palette_size,
fbi->palette_cpu, fbi->palette_phys);
failed_free_io:
iounmap(fbi->regbase);
failed_free_res:
release_mem_region(res->start, resource_size(res));
failed_fbi:
platform_set_drvdata(pdev, NULL);
kfree(fbi);
failed:
return ret;
}
static int __devexit vt8500lcd_remove(struct platform_device *pdev)
{
struct vt8500lcd_info *fbi = platform_get_drvdata(pdev);
struct resource *res;
int irq;
unregister_framebuffer(&fbi->fb);
writel(0, fbi->regbase);
if (fbi->fb.cmap.len)
fb_dealloc_cmap(&fbi->fb.cmap);
irq = platform_get_irq(pdev, 0);
free_irq(irq, fbi);
dma_free_coherent(&pdev->dev, fbi->palette_size,
fbi->palette_cpu, fbi->palette_phys);
iounmap(fbi->regbase);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
kfree(fbi);
return 0;
}
static struct platform_driver vt8500lcd_driver = {
.probe = vt8500lcd_probe,
.remove = __devexit_p(vt8500lcd_remove),
.driver = {
.owner = THIS_MODULE,
.name = "vt8500-lcd",
},
};
static int __init vt8500lcd_init(void)
{
return platform_driver_register(&vt8500lcd_driver);
}
static void __exit vt8500lcd_exit(void)
{
platform_driver_unregister(&vt8500lcd_driver);
}
module_init(vt8500lcd_init);
module_exit(vt8500lcd_exit);
MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
MODULE_DESCRIPTION("LCD controller driver for VIA VT8500");
MODULE_LICENSE("GPL");