- 根目录:
- drivers
- video
- fbdev
- pxa168fb.c
/*
* linux/drivers/video/pxa168fb.c -- Marvell PXA168 LCD Controller
*
* Copyright (C) 2008 Marvell International Ltd.
* All rights reserved.
*
* 2009-02-16 adapted from original version for PXA168/910
* Jun Nie <njun@marvell.com>
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/uaccess.h>
#include <video/pxa168fb.h>
#include "pxa168fb.h"
#define DEFAULT_REFRESH 60 /* Hz */
static int determine_best_pix_fmt(struct fb_var_screeninfo *var)
{
/*
* Pseudocolor mode?
*/
if (var->bits_per_pixel == 8)
return PIX_FMT_PSEUDOCOLOR;
/*
* Check for 565/1555.
*/
if (var->bits_per_pixel == 16 && var->red.length <= 5 &&
var->green.length <= 6 && var->blue.length <= 5) {
if (var->transp.length == 0) {
if (var->red.offset >= var->blue.offset)
return PIX_FMT_RGB565;
else
return PIX_FMT_BGR565;
}
if (var->transp.length == 1 && var->green.length <= 5) {
if (var->red.offset >= var->blue.offset)
return PIX_FMT_RGB1555;
else
return PIX_FMT_BGR1555;
}
/* fall through */
}
/*
* Check for 888/A888.
*/
if (var->bits_per_pixel <= 32 && var->red.length <= 8 &&
var->green.length <= 8 && var->blue.length <= 8) {
if (var->bits_per_pixel == 24 && var->transp.length == 0) {
if (var->red.offset >= var->blue.offset)
return PIX_FMT_RGB888PACK;
else
return PIX_FMT_BGR888PACK;
}
if (var->bits_per_pixel == 32 && var->transp.length == 8) {
if (var->red.offset >= var->blue.offset)
return PIX_FMT_RGBA888;
else
return PIX_FMT_BGRA888;
} else {
if (var->red.offset >= var->blue.offset)
return PIX_FMT_RGB888UNPACK;
else
return PIX_FMT_BGR888UNPACK;
}
/* fall through */
}
return -EINVAL;
}
static void set_pix_fmt(struct fb_var_screeninfo *var, int pix_fmt)
{
switch (pix_fmt) {
case PIX_FMT_RGB565:
var->bits_per_pixel = 16;
var->red.offset = 11; var->red.length = 5;
var->green.offset = 5; var->green.length = 6;
var->blue.offset = 0; var->blue.length = 5;
var->transp.offset = 0; var->transp.length = 0;
break;
case PIX_FMT_BGR565:
var->bits_per_pixel = 16;
var->red.offset = 0; var->red.length = 5;
var->green.offset = 5; var->green.length = 6;
var->blue.offset = 11; var->blue.length = 5;
var->transp.offset = 0; var->transp.length = 0;
break;
case PIX_FMT_RGB1555:
var->bits_per_pixel = 16;
var->red.offset = 10; var->red.length = 5;
var->green.offset = 5; var->green.length = 5;
var->blue.offset = 0; var->blue.length = 5;
var->transp.offset = 15; var->transp.length = 1;
break;
case PIX_FMT_BGR1555:
var->bits_per_pixel = 16;
var->red.offset = 0; var->red.length = 5;
var->green.offset = 5; var->green.length = 5;
var->blue.offset = 10; var->blue.length = 5;
var->transp.offset = 15; var->transp.length = 1;
break;
case PIX_FMT_RGB888PACK:
var->bits_per_pixel = 24;
var->red.offset = 16; var->red.length = 8;
var->green.offset = 8; var->green.length = 8;
var->blue.offset = 0; var->blue.length = 8;
var->transp.offset = 0; var->transp.length = 0;
break;
case PIX_FMT_BGR888PACK:
var->bits_per_pixel = 24;
var->red.offset = 0; var->red.length = 8;
var->green.offset = 8; var->green.length = 8;
var->blue.offset = 16; var->blue.length = 8;
var->transp.offset = 0; var->transp.length = 0;
break;
case PIX_FMT_RGBA888:
var->bits_per_pixel = 32;
var->red.offset = 16; var->red.length = 8;
var->green.offset = 8; var->green.length = 8;
var->blue.offset = 0; var->blue.length = 8;
var->transp.offset = 24; var->transp.length = 8;
break;
case PIX_FMT_BGRA888:
var->bits_per_pixel = 32;
var->red.offset = 0; var->red.length = 8;
var->green.offset = 8; var->green.length = 8;
var->blue.offset = 16; var->blue.length = 8;
var->transp.offset = 24; var->transp.length = 8;
break;
case PIX_FMT_PSEUDOCOLOR:
var->bits_per_pixel = 8;
var->red.offset = 0; var->red.length = 8;
var->green.offset = 0; var->green.length = 8;
var->blue.offset = 0; var->blue.length = 8;
var->transp.offset = 0; var->transp.length = 0;
break;
}
}
static void set_mode(struct pxa168fb_info *fbi, struct fb_var_screeninfo *var,
struct fb_videomode *mode, int pix_fmt, int ystretch)
{
struct fb_info *info = fbi->info;
set_pix_fmt(var, pix_fmt);
var->xres = mode->xres;
var->yres = mode->yres;
var->xres_virtual = max(var->xres, var->xres_virtual);
if (ystretch)
var->yres_virtual = info->fix.smem_len /
(var->xres_virtual * (var->bits_per_pixel >> 3));
else
var->yres_virtual = max(var->yres, var->yres_virtual);
var->grayscale = 0;
var->accel_flags = FB_ACCEL_NONE;
var->pixclock = mode->pixclock;
var->left_margin = mode->left_margin;
var->right_margin = mode->right_margin;
var->upper_margin = mode->upper_margin;
var->lower_margin = mode->lower_margin;
var->hsync_len = mode->hsync_len;
var->vsync_len = mode->vsync_len;
var->sync = mode->sync;
var->vmode = FB_VMODE_NONINTERLACED;
var->rotate = FB_ROTATE_UR;
}
static int pxa168fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct pxa168fb_info *fbi = info->par;
int pix_fmt;
/*
* Determine which pixel format we're going to use.
*/
pix_fmt = determine_best_pix_fmt(var);
if (pix_fmt < 0)
return pix_fmt;
set_pix_fmt(var, pix_fmt);
fbi->pix_fmt = pix_fmt;
/*
* Basic geometry sanity checks.
*/
if (var->xoffset + var->xres > var->xres_virtual)
return -EINVAL;
if (var->yoffset + var->yres > var->yres_virtual)
return -EINVAL;
if (var->xres + var->right_margin +
var->hsync_len + var->left_margin > 2048)
return -EINVAL;
if (var->yres + var->lower_margin +
var->vsync_len + var->upper_margin > 2048)
return -EINVAL;
/*
* Check size of framebuffer.
*/
if (var->xres_virtual * var->yres_virtual *
(var->bits_per_pixel >> 3) > info->fix.smem_len)
return -EINVAL;
return 0;
}
/*
* The hardware clock divider has an integer and a fractional
* stage:
*
* clk2 = clk_in / integer_divider
* clk_out = clk2 * (1 - (fractional_divider >> 12))
*
* Calculate integer and fractional divider for given clk_in
* and clk_out.
*/
static void set_clock_divider(struct pxa168fb_info *fbi,
const struct fb_videomode *m)
{
int divider_int;
int needed_pixclk;
u64 div_result;
u32 x = 0;
/*
* Notice: The field pixclock is used by linux fb
* is in pixel second. E.g. struct fb_videomode &
* struct fb_var_screeninfo
*/
/*
* Check input values.
*/
if (!m || !m->pixclock || !m->refresh) {
dev_err(fbi->dev, "Input refresh or pixclock is wrong.\n");
return;
}
/*
* Using PLL/AXI clock.
*/
x = 0x80000000;
/*
* Calc divider according to refresh rate.
*/
div_result = 1000000000000ll;
do_div(div_result, m->pixclock);
needed_pixclk = (u32)div_result;
divider_int = clk_get_rate(fbi->clk) / needed_pixclk;
/* check whether divisor is too small. */
if (divider_int < 2) {
dev_warn(fbi->dev, "Warning: clock source is too slow."
"Try smaller resolution\n");
divider_int = 2;
}
/*
* Set setting to reg.
*/
x |= divider_int;
writel(x, fbi->reg_base + LCD_CFG_SCLK_DIV);
}
static void set_dma_control0(struct pxa168fb_info *fbi)
{
u32 x;
/*
* Set bit to enable graphics DMA.
*/
x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0);
x &= ~CFG_GRA_ENA_MASK;
x |= fbi->active ? CFG_GRA_ENA(1) : CFG_GRA_ENA(0);
/*
* If we are in a pseudo-color mode, we need to enable
* palette lookup.
*/
if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR)
x |= 0x10000000;
/*
* Configure hardware pixel format.
*/
x &= ~(0xF << 16);
x |= (fbi->pix_fmt >> 1) << 16;
/*
* Check red and blue pixel swap.
* 1. source data swap
* 2. panel output data swap
*/
x &= ~(1 << 12);
x |= ((fbi->pix_fmt & 1) ^ (fbi->panel_rbswap)) << 12;
writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL0);
}
static void set_dma_control1(struct pxa168fb_info *fbi, int sync)
{
u32 x;
/*
* Configure default bits: vsync triggers DMA, gated clock
* enable, power save enable, configure alpha registers to
* display 100% graphics, and set pixel command.
*/
x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL1);
x |= 0x2032ff81;
/*
* We trigger DMA on the falling edge of vsync if vsync is
* active low, or on the rising edge if vsync is active high.
*/
if (!(sync & FB_SYNC_VERT_HIGH_ACT))
x |= 0x08000000;
writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL1);
}
static void set_graphics_start(struct fb_info *info, int xoffset, int yoffset)
{
struct pxa168fb_info *fbi = info->par;
struct fb_var_screeninfo *var = &info->var;
int pixel_offset;
unsigned long addr;
pixel_offset = (yoffset * var->xres_virtual) + xoffset;
addr = fbi->fb_start_dma + (pixel_offset * (var->bits_per_pixel >> 3));
writel(addr, fbi->reg_base + LCD_CFG_GRA_START_ADDR0);
}
static void set_dumb_panel_control(struct fb_info *info)
{
struct pxa168fb_info *fbi = info->par;
struct pxa168fb_mach_info *mi = dev_get_platdata(fbi->dev);
u32 x;
/*
* Preserve enable flag.
*/
x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL) & 0x00000001;
x |= (fbi->is_blanked ? 0x7 : mi->dumb_mode) << 28;
x |= mi->gpio_output_data << 20;
x |= mi->gpio_output_mask << 12;
x |= mi->panel_rgb_reverse_lanes ? 0x00000080 : 0;
x |= mi->invert_composite_blank ? 0x00000040 : 0;
x |= (info->var.sync & FB_SYNC_COMP_HIGH_ACT) ? 0x00000020 : 0;
x |= mi->invert_pix_val_ena ? 0x00000010 : 0;
x |= (info->var.sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 0x00000008;
x |= (info->var.sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 0x00000004;
x |= mi->invert_pixclock ? 0x00000002 : 0;
writel(x, fbi->reg_base + LCD_SPU_DUMB_CTRL);
}
static void set_dumb_screen_dimensions(struct fb_info *info)
{
struct pxa168fb_info *fbi = info->par;
struct fb_var_screeninfo *v = &info->var;
int x;
int y;
x = v->xres + v->right_margin + v->hsync_len + v->left_margin;
y = v->yres + v->lower_margin + v->vsync_len + v->upper_margin;
writel((y << 16) | x, fbi->reg_base + LCD_SPUT_V_H_TOTAL);
}
static int pxa168fb_set_par(struct fb_info *info)
{
struct pxa168fb_info *fbi = info->par;
struct fb_var_screeninfo *var = &info->var;
struct fb_videomode mode;
u32 x;
struct pxa168fb_mach_info *mi;
mi = dev_get_platdata(fbi->dev);
/*
* Set additional mode info.
*/
if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR)
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
else
info->fix.visual = FB_VISUAL_TRUECOLOR;
info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8;
info->fix.ypanstep = var->yres;
/*
* Disable panel output while we setup the display.
*/
x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL);
writel(x & ~1, fbi->reg_base + LCD_SPU_DUMB_CTRL);
/*
* Configure global panel parameters.
*/
writel((var->yres << 16) | var->xres,
fbi->reg_base + LCD_SPU_V_H_ACTIVE);
/*
* convet var to video mode
*/
fb_var_to_videomode(&mode, &info->var);
/* Calculate clock divisor. */
set_clock_divider(fbi, &mode);
/* Configure dma ctrl regs. */
set_dma_control0(fbi);
set_dma_control1(fbi, info->var.sync);
/*
* Configure graphics DMA parameters.
*/
x = readl(fbi->reg_base + LCD_CFG_GRA_PITCH);
x = (x & ~0xFFFF) | ((var->xres_virtual * var->bits_per_pixel) >> 3);
writel(x, fbi->reg_base + LCD_CFG_GRA_PITCH);
writel((var->yres << 16) | var->xres,
fbi->reg_base + LCD_SPU_GRA_HPXL_VLN);
writel((var->yres << 16) | var->xres,
fbi->reg_base + LCD_SPU_GZM_HPXL_VLN);
/*
* Configure dumb panel ctrl regs & timings.
*/
set_dumb_panel_control(info);
set_dumb_screen_dimensions(info);
writel((var->left_margin << 16) | var->right_margin,
fbi->reg_base + LCD_SPU_H_PORCH);
writel((var->upper_margin << 16) | var->lower_margin,
fbi->reg_base + LCD_SPU_V_PORCH);
/*
* Re-enable panel output.
*/
x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL);
writel(x | 1, fbi->reg_base + LCD_SPU_DUMB_CTRL);
return 0;
}
static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
{
return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
}
static u32 to_rgb(u16 red, u16 green, u16 blue)
{
red >>= 8;
green >>= 8;
blue >>= 8;
return (red << 16) | (green << 8) | blue;
}
static int
pxa168fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
unsigned int blue, unsigned int trans, struct fb_info *info)
{
struct pxa168fb_info *fbi = info->par;
u32 val;
if (info->var.grayscale)
red = green = blue = (19595 * red + 38470 * green +
7471 * blue) >> 16;
if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 16) {
val = chan_to_field(red, &info->var.red);
val |= chan_to_field(green, &info->var.green);
val |= chan_to_field(blue , &info->var.blue);
fbi->pseudo_palette[regno] = val;
}
if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
val = to_rgb(red, green, blue);
writel(val, fbi->reg_base + LCD_SPU_SRAM_WRDAT);
writel(0x8300 | regno, fbi->reg_base + LCD_SPU_SRAM_CTRL);
}
return 0;
}
static int pxa168fb_blank(int blank, struct fb_info *info)
{
struct pxa168fb_info *fbi = info->par;
fbi->is_blanked = (blank == FB_BLANK_UNBLANK) ? 0 : 1;
set_dumb_panel_control(info);
return 0;
}
static int pxa168fb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
set_graphics_start(info, var->xoffset, var->yoffset);
return 0;
}
static irqreturn_t pxa168fb_handle_irq(int irq, void *dev_id)
{
struct pxa168fb_info *fbi = dev_id;
u32 isr = readl(fbi->reg_base + SPU_IRQ_ISR);
if ((isr & GRA_FRAME_IRQ0_ENA_MASK)) {
writel(isr & (~GRA_FRAME_IRQ0_ENA_MASK),
fbi->reg_base + SPU_IRQ_ISR);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static struct fb_ops pxa168fb_ops = {
.owner = THIS_MODULE,
.fb_check_var = pxa168fb_check_var,
.fb_set_par = pxa168fb_set_par,
.fb_setcolreg = pxa168fb_setcolreg,
.fb_blank = pxa168fb_blank,
.fb_pan_display = pxa168fb_pan_display,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
};
static int pxa168fb_init_mode(struct fb_info *info,
struct pxa168fb_mach_info *mi)
{
struct pxa168fb_info *fbi = info->par;
struct fb_var_screeninfo *var = &info->var;
int ret = 0;
u32 total_w, total_h, refresh;
u64 div_result;
const struct fb_videomode *m;
/*
* Set default value
*/
refresh = DEFAULT_REFRESH;
/* try to find best video mode. */
m = fb_find_best_mode(&info->var, &info->modelist);
if (m)
fb_videomode_to_var(&info->var, m);
/* Init settings. */
var->xres_virtual = var->xres;
var->yres_virtual = info->fix.smem_len /
(var->xres_virtual * (var->bits_per_pixel >> 3));
dev_dbg(fbi->dev, "pxa168fb: find best mode: res = %dx%d\n",
var->xres, var->yres);
/* correct pixclock. */
total_w = var->xres + var->left_margin + var->right_margin +
var->hsync_len;
total_h = var->yres + var->upper_margin + var->lower_margin +
var->vsync_len;
div_result = 1000000000000ll;
do_div(div_result, total_w * total_h * refresh);
var->pixclock = (u32)div_result;
return ret;
}
static int pxa168fb_probe(struct platform_device *pdev)
{
struct pxa168fb_mach_info *mi;
struct fb_info *info = 0;
struct pxa168fb_info *fbi = 0;
struct resource *res;
struct clk *clk;
int irq, ret;
mi = dev_get_platdata(&pdev->dev);
if (mi == NULL) {
dev_err(&pdev->dev, "no platform data defined\n");
return -EINVAL;
}
clk = clk_get(&pdev->dev, "LCDCLK");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "unable to get LCDCLK");
return PTR_ERR(clk);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no IO memory defined\n");
ret = -ENOENT;
goto failed_put_clk;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no IRQ defined\n");
ret = -ENOENT;
goto failed_put_clk;
}
info = framebuffer_alloc(sizeof(struct pxa168fb_info), &pdev->dev);
if (info == NULL) {
ret = -ENOMEM;
goto failed_put_clk;
}
/* Initialize private data */
fbi = info->par;
fbi->info = info;
fbi->clk = clk;
fbi->dev = info->dev = &pdev->dev;
fbi->panel_rbswap = mi->panel_rbswap;
fbi->is_blanked = 0;
fbi->active = mi->active;
/*
* Initialise static fb parameters.
*/
info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK |
FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
info->node = -1;
strlcpy(info->fix.id, mi->id, 16);
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.type_aux = 0;
info->fix.xpanstep = 0;
info->fix.ypanstep = 0;
info->fix.ywrapstep = 0;
info->fix.mmio_start = res->start;
info->fix.mmio_len = resource_size(res);
info->fix.accel = FB_ACCEL_NONE;
info->fbops = &pxa168fb_ops;
info->pseudo_palette = fbi->pseudo_palette;
/*
* Map LCD controller registers.
*/
fbi->reg_base = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (fbi->reg_base == NULL) {
ret = -ENOMEM;
goto failed_free_info;
}
/*
* Allocate framebuffer memory.
*/
info->fix.smem_len = PAGE_ALIGN(DEFAULT_FB_SIZE);
info->screen_base = dma_alloc_writecombine(fbi->dev, info->fix.smem_len,
&fbi->fb_start_dma, GFP_KERNEL);
if (info->screen_base == NULL) {
ret = -ENOMEM;
goto failed_free_info;
}
info->fix.smem_start = (unsigned long)fbi->fb_start_dma;
set_graphics_start(info, 0, 0);
/*
* Set video mode according to platform data.
*/
set_mode(fbi, &info->var, mi->modes, mi->pix_fmt, 1);
fb_videomode_to_modelist(mi->modes, mi->num_modes, &info->modelist);
/*
* init video mode data.
*/
pxa168fb_init_mode(info, mi);
/*
* Fill in sane defaults.
*/
ret = pxa168fb_check_var(&info->var, info);
if (ret)
goto failed_free_fbmem;
/*
* enable controller clock
*/
clk_enable(fbi->clk);
pxa168fb_set_par(info);
/*
* Configure default register values.
*/
writel(0, fbi->reg_base + LCD_SPU_BLANKCOLOR);
writel(mi->io_pin_allocation_mode, fbi->reg_base + SPU_IOPAD_CONTROL);
writel(0, fbi->reg_base + LCD_CFG_GRA_START_ADDR1);
writel(0, fbi->reg_base + LCD_SPU_GRA_OVSA_HPXL_VLN);
writel(0, fbi->reg_base + LCD_SPU_SRAM_PARA0);
writel(CFG_CSB_256x32(0x1)|CFG_CSB_256x24(0x1)|CFG_CSB_256x8(0x1),
fbi->reg_base + LCD_SPU_SRAM_PARA1);
/*
* Allocate color map.
*/
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
ret = -ENOMEM;
goto failed_free_clk;
}
/*
* Register irq handler.
*/
ret = devm_request_irq(&pdev->dev, irq, pxa168fb_handle_irq,
IRQF_SHARED, info->fix.id, fbi);
if (ret < 0) {
dev_err(&pdev->dev, "unable to request IRQ\n");
ret = -ENXIO;
goto failed_free_cmap;
}
/*
* Enable GFX interrupt
*/
writel(GRA_FRAME_IRQ0_ENA(0x1), fbi->reg_base + SPU_IRQ_ENA);
/*
* Register framebuffer.
*/
ret = register_framebuffer(info);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register pxa168-fb: %d\n", ret);
ret = -ENXIO;
goto failed_free_cmap;
}
platform_set_drvdata(pdev, fbi);
return 0;
failed_free_cmap:
fb_dealloc_cmap(&info->cmap);
failed_free_clk:
clk_disable(fbi->clk);
failed_free_fbmem:
dma_free_coherent(fbi->dev, info->fix.smem_len,
info->screen_base, fbi->fb_start_dma);
failed_free_info:
kfree(info);
failed_put_clk:
clk_put(clk);
dev_err(&pdev->dev, "frame buffer device init failed with %d\n", ret);
return ret;
}
static int pxa168fb_remove(struct platform_device *pdev)
{
struct pxa168fb_info *fbi = platform_get_drvdata(pdev);
struct fb_info *info;
int irq;
unsigned int data;
if (!fbi)
return 0;
/* disable DMA transfer */
data = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0);
data &= ~CFG_GRA_ENA_MASK;
writel(data, fbi->reg_base + LCD_SPU_DMA_CTRL0);
info = fbi->info;
unregister_framebuffer(info);
writel(GRA_FRAME_IRQ0_ENA(0x0), fbi->reg_base + SPU_IRQ_ENA);
if (info->cmap.len)
fb_dealloc_cmap(&info->cmap);
irq = platform_get_irq(pdev, 0);
dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
info->screen_base, info->fix.smem_start);
clk_disable(fbi->clk);
clk_put(fbi->clk);
framebuffer_release(info);
return 0;
}
static struct platform_driver pxa168fb_driver = {
.driver = {
.name = "pxa168-fb",
},
.probe = pxa168fb_probe,
.remove = pxa168fb_remove,
};
module_platform_driver(pxa168fb_driver);
MODULE_AUTHOR("Lennert Buytenhek <buytenh@marvell.com> "
"Green Wan <gwan@marvell.com>");
MODULE_DESCRIPTION("Framebuffer driver for PXA168/910");
MODULE_LICENSE("GPL");