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imxfb: add clock support 

v2: Added change from Martin Fuzzey: pixclock should be in pico seconds
    instead of MHz.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-01-15 15:21:00 +01:00
parent 74bef9a4fa
commit f909ef6437
1 changed files with 39 additions and 1 deletions
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40
drivers/video/imxfb.c
View File

@ -26,9 +26,11 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/math64.h>
#include <mach/imxfb.h>
@ -141,6 +143,7 @@ struct imxfb_rgb {
struct imxfb_info {
struct platform_device *pdev;
void __iomem *regs;
struct clk *clk;
u_int max_bpp;
u_int max_xres;
@ -403,6 +406,8 @@ static void imxfb_enable_controller(struct imxfb_info *fbi)
writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);
clk_enable(fbi->clk);
if (fbi->backlight_power)
fbi->backlight_power(1);
if (fbi->lcd_power)
@ -418,6 +423,8 @@ static void imxfb_disable_controller(struct imxfb_info *fbi)
if (fbi->lcd_power)
fbi->lcd_power(0);
clk_disable(fbi->clk);
writel(0, fbi->regs + LCDC_RMCR);
}
@ -461,6 +468,9 @@ static struct fb_ops imxfb_ops = {
static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
struct imxfb_info *fbi = info->par;
unsigned int pcr, lcd_clk;
unsigned long long tmp;
pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
var->xres, var->hsync_len,
var->left_margin, var->right_margin);
@ -507,7 +517,23 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf
writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),
fbi->regs + LCDC_SIZE);
writel(fbi->pcr, fbi->regs + LCDC_PCR);
lcd_clk = clk_get_rate(fbi->clk);
tmp = var->pixclock * (unsigned long long)lcd_clk;
do_div(tmp, 1000000);
if (do_div(tmp, 1000000) > 500000)
tmp++;
pcr = (unsigned int)tmp;
if (--pcr > 0x3F) {
pcr = 0x3F;
printk(KERN_WARNING "Must limit pixel clock to %uHz\n",
lcd_clk / pcr);
}
/* add sync polarities */
pcr |= fbi->pcr & ~0x3F;
writel(pcr, fbi->regs + LCDC_PCR);
writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
@ -649,6 +675,13 @@ static int __init imxfb_probe(struct platform_device *pdev)
goto failed_req;
}
fbi->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(fbi->clk)) {
ret = PTR_ERR(fbi->clk);;
dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
goto failed_getclock;
}
fbi->regs = ioremap(res->start, resource_size(res));
if (fbi->regs == NULL) {
printk(KERN_ERR"Cannot map frame buffer registers\n");
@ -717,6 +750,8 @@ static int __init imxfb_probe(struct platform_device *pdev)
dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
fbi->map_dma);
failed_map:
clk_put(fbi->clk);
failed_getclock:
iounmap(fbi->regs);
failed_ioremap:
release_mem_region(res->start, res->end - res->start);
@ -751,6 +786,9 @@ static int __devexit imxfb_remove(struct platform_device *pdev)
iounmap(fbi->regs);
release_mem_region(res->start, res->end - res->start + 1);
clk_disable(fbi->clk);
clk_put(fbi->clk);
platform_set_drvdata(pdev, NULL);
return 0;