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