video: imxfb: Add DT support
Add devicetree support for imx framebuffer driver. It uses the generic display bindings and helper functions. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> Cc: Fabio Estevam <festevam@gmail.com> Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
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51
Documentation/devicetree/bindings/video/fsl,imx-fb.txt
Normal file
51
Documentation/devicetree/bindings/video/fsl,imx-fb.txt
Normal file
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@ -0,0 +1,51 @@
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Freescale imx21 Framebuffer
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This framebuffer driver supports devices imx1, imx21, imx25, and imx27.
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Required properties:
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- compatible : "fsl,<chip>-fb", chip should be imx1 or imx21
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- reg : Should contain 1 register ranges(address and length)
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- interrupts : One interrupt of the fb dev
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Required nodes:
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- display: Phandle to a display node as described in
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Documentation/devicetree/bindings/video/display-timing.txt
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Additional, the display node has to define properties:
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- bits-per-pixel: Bits per pixel
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- fsl,pcr: LCDC PCR value
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Optional properties:
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- fsl,dmacr: DMA Control Register value. This is optional. By default, the
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register is not modified as recommended by the datasheet.
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- fsl,lscr1: LCDC Sharp Configuration Register value.
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Example:
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imxfb: fb@10021000 {
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compatible = "fsl,imx21-fb";
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interrupts = <61>;
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reg = <0x10021000 0x1000>;
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display = <&display0>;
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};
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...
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display0: display0 {
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model = "Primeview-PD050VL1";
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native-mode = <&timing_disp0>;
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bits-per-pixel = <16>;
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fsl,pcr = <0xf0c88080>; /* non-standard but required */
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display-timings {
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timing_disp0: 640x480 {
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hactive = <640>;
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vactive = <480>;
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hback-porch = <112>;
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hfront-porch = <36>;
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hsync-len = <32>;
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vback-porch = <33>;
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vfront-porch = <33>;
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vsync-len = <2>;
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clock-frequency = <25000000>;
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};
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};
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};
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@ -367,6 +367,8 @@ config FB_IMX
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select FB_CFB_FILLRECT
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select FB_CFB_COPYAREA
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select FB_CFB_IMAGEBLIT
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select FB_MODE_HELPERS
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select VIDEOMODE_HELPERS
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config FB_CYBER2000
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tristate "CyberPro 2000/2010/5000 support"
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@ -31,6 +31,12 @@
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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 <linux/of.h>
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#include <linux/of_device.h>
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#include <video/of_display_timing.h>
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#include <video/of_videomode.h>
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#include <video/videomode.h>
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#include <linux/platform_data/video-imxfb.h>
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@ -112,10 +118,11 @@
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#define LCDISR_EOF (1<<1)
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#define LCDISR_BOF (1<<0)
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#define IMXFB_LSCR1_DEFAULT 0x00120300
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/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
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static const char *fb_mode;
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/*
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* These are the bitfields for each
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* display depth that we support.
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@ -187,6 +194,19 @@ static struct platform_device_id imxfb_devtype[] = {
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};
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MODULE_DEVICE_TABLE(platform, imxfb_devtype);
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static struct of_device_id imxfb_of_dev_id[] = {
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{
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.compatible = "fsl,imx1-fb",
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.data = &imxfb_devtype[IMX1_FB],
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}, {
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.compatible = "fsl,imx21-fb",
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.data = &imxfb_devtype[IMX21_FB],
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}, {
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(of, imxfb_of_dev_id);
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static inline int is_imx1_fb(struct imxfb_info *fbi)
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{
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return fbi->devtype == IMX1_FB;
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@ -319,6 +339,9 @@ static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi)
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struct imx_fb_videomode *m;
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int i;
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if (!fb_mode)
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return &fbi->mode[0];
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for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) {
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if (!strcmp(m->mode.name, fb_mode))
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return m;
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@ -474,6 +497,9 @@ static int imxfb_bl_update_status(struct backlight_device *bl)
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struct imxfb_info *fbi = bl_get_data(bl);
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int brightness = bl->props.brightness;
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if (!fbi->pwmr)
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return 0;
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if (bl->props.power != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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@ -684,10 +710,14 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf
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writel(fbi->pcr, fbi->regs + LCDC_PCR);
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#ifndef PWMR_BACKLIGHT_AVAILABLE
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writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
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if (fbi->pwmr)
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writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
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#endif
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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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/* dmacr = 0 is no valid value, as we need DMA control marks. */
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if (fbi->dmacr)
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writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
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return 0;
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}
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@ -723,13 +753,12 @@ static int imxfb_resume(struct platform_device *dev)
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#define imxfb_resume NULL
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#endif
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static int __init imxfb_init_fbinfo(struct platform_device *pdev)
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static int imxfb_init_fbinfo(struct platform_device *pdev)
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{
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struct imx_fb_platform_data *pdata = pdev->dev.platform_data;
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struct fb_info *info = dev_get_drvdata(&pdev->dev);
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struct imxfb_info *fbi = info->par;
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struct imx_fb_videomode *m;
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int i;
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struct device_node *np;
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pr_debug("%s\n",__func__);
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@ -760,41 +789,95 @@ static int __init imxfb_init_fbinfo(struct platform_device *pdev)
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info->fbops = &imxfb_ops;
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info->flags = FBINFO_FLAG_DEFAULT |
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FBINFO_READS_FAST;
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info->var.grayscale = pdata->cmap_greyscale;
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fbi->cmap_inverse = pdata->cmap_inverse;
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fbi->cmap_static = pdata->cmap_static;
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fbi->lscr1 = pdata->lscr1;
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fbi->dmacr = pdata->dmacr;
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fbi->pwmr = pdata->pwmr;
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fbi->lcd_power = pdata->lcd_power;
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fbi->backlight_power = pdata->backlight_power;
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if (pdata) {
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info->var.grayscale = pdata->cmap_greyscale;
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fbi->cmap_inverse = pdata->cmap_inverse;
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fbi->cmap_static = pdata->cmap_static;
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fbi->lscr1 = pdata->lscr1;
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fbi->dmacr = pdata->dmacr;
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fbi->pwmr = pdata->pwmr;
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fbi->lcd_power = pdata->lcd_power;
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fbi->backlight_power = pdata->backlight_power;
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} else {
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np = pdev->dev.of_node;
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info->var.grayscale = of_property_read_bool(np,
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"cmap-greyscale");
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fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse");
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fbi->cmap_static = of_property_read_bool(np, "cmap-static");
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for (i = 0, m = &pdata->mode[0]; i < pdata->num_modes; i++, m++)
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info->fix.smem_len = max_t(size_t, info->fix.smem_len,
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m->mode.xres * m->mode.yres * m->bpp / 8);
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fbi->lscr1 = IMXFB_LSCR1_DEFAULT;
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of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1);
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of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr);
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/* These two function pointers could be used by some specific
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* platforms. */
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fbi->lcd_power = NULL;
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fbi->backlight_power = NULL;
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}
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return 0;
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}
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static int __init imxfb_probe(struct platform_device *pdev)
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static int imxfb_of_read_mode(struct device *dev, struct device_node *np,
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struct imx_fb_videomode *imxfb_mode)
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{
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int ret;
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struct fb_videomode *of_mode = &imxfb_mode->mode;
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u32 bpp;
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u32 pcr;
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ret = of_property_read_string(np, "model", &of_mode->name);
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if (ret)
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of_mode->name = NULL;
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ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE);
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if (ret) {
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dev_err(dev, "Failed to get videomode from DT\n");
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return ret;
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}
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ret = of_property_read_u32(np, "bits-per-pixel", &bpp);
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ret |= of_property_read_u32(np, "fsl,pcr", &pcr);
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if (ret) {
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dev_err(dev, "Failed to read bpp and pcr from DT\n");
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return -EINVAL;
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}
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if (bpp < 1 || bpp > 255) {
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dev_err(dev, "Bits per pixel have to be between 1 and 255\n");
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return -EINVAL;
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}
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imxfb_mode->bpp = bpp;
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imxfb_mode->pcr = pcr;
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return 0;
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}
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static int imxfb_probe(struct platform_device *pdev)
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{
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struct imxfb_info *fbi;
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struct fb_info *info;
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struct imx_fb_platform_data *pdata;
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struct resource *res;
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struct imx_fb_videomode *m;
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const struct of_device_id *of_id;
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int ret, i;
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int bytes_per_pixel;
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dev_info(&pdev->dev, "i.MX Framebuffer driver\n");
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of_id = of_match_device(imxfb_of_dev_id, &pdev->dev);
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if (of_id)
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pdev->id_entry = of_id->data;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev,"No platform_data available\n");
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return -ENOMEM;
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}
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info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
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if (!info)
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fbi = info->par;
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if (!fb_mode)
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fb_mode = pdata->mode[0].mode.name;
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platform_set_drvdata(pdev, info);
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ret = imxfb_init_fbinfo(pdev);
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if (ret < 0)
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goto failed_init;
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if (pdata) {
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if (!fb_mode)
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fb_mode = pdata->mode[0].mode.name;
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fbi->mode = pdata->mode;
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fbi->num_modes = pdata->num_modes;
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} else {
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struct device_node *display_np;
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fb_mode = NULL;
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display_np = of_parse_phandle(pdev->dev.of_node, "display", 0);
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if (!display_np) {
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dev_err(&pdev->dev, "No display defined in devicetree\n");
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ret = -EINVAL;
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goto failed_of_parse;
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}
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/*
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* imxfb does not support more modes, we choose only the native
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* mode.
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*/
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fbi->num_modes = 1;
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fbi->mode = devm_kzalloc(&pdev->dev,
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sizeof(struct imx_fb_videomode), GFP_KERNEL);
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if (!fbi->mode) {
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ret = -ENOMEM;
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goto failed_of_parse;
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}
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ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode);
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if (ret)
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goto failed_of_parse;
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}
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/* Calculate maximum bytes used per pixel. In most cases this should
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* be the same as m->bpp/8 */
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m = &fbi->mode[0];
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bytes_per_pixel = (m->bpp + 7) / 8;
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for (i = 0; i < fbi->num_modes; i++, m++)
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info->fix.smem_len = max_t(size_t, info->fix.smem_len,
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m->mode.xres * m->mode.yres * bytes_per_pixel);
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res = request_mem_region(res->start, resource_size(res),
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DRIVER_NAME);
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if (!res) {
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@ -843,7 +966,8 @@ static int __init imxfb_probe(struct platform_device *pdev)
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goto failed_ioremap;
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}
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if (!pdata->fixed_screen_cpu) {
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/* Seems not being used by anyone, so no support for oftree */
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if (!pdata || !pdata->fixed_screen_cpu) {
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fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
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fbi->map_cpu = dma_alloc_writecombine(&pdev->dev,
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fbi->map_size, &fbi->map_dma, GFP_KERNEL);
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@ -868,18 +992,16 @@ static int __init imxfb_probe(struct platform_device *pdev)
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info->fix.smem_start = fbi->screen_dma;
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}
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if (pdata->init) {
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if (pdata && pdata->init) {
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ret = pdata->init(fbi->pdev);
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if (ret)
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goto failed_platform_init;
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}
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fbi->mode = pdata->mode;
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fbi->num_modes = pdata->num_modes;
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INIT_LIST_HEAD(&info->modelist);
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for (i = 0; i < pdata->num_modes; i++)
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fb_add_videomode(&pdata->mode[i].mode, &info->modelist);
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for (i = 0; i < fbi->num_modes; i++)
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fb_add_videomode(&fbi->mode[i].mode, &info->modelist);
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/*
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* This makes sure that our colour bitfield
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@ -909,10 +1031,10 @@ static int __init imxfb_probe(struct platform_device *pdev)
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failed_register:
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fb_dealloc_cmap(&info->cmap);
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failed_cmap:
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if (pdata->exit)
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if (pdata && pdata->exit)
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pdata->exit(fbi->pdev);
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failed_platform_init:
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if (!pdata->fixed_screen_cpu)
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if (pdata && !pdata->fixed_screen_cpu)
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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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@ -921,6 +1043,7 @@ failed_ioremap:
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failed_getclock:
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release_mem_region(res->start, resource_size(res));
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failed_req:
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failed_of_parse:
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kfree(info->pseudo_palette);
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failed_init:
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framebuffer_release(info);
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@ -944,7 +1067,7 @@ static int imxfb_remove(struct platform_device *pdev)
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unregister_framebuffer(info);
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pdata = pdev->dev.platform_data;
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if (pdata->exit)
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if (pdata && pdata->exit)
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pdata->exit(fbi->pdev);
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fb_dealloc_cmap(&info->cmap);
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@ -971,6 +1094,7 @@ static struct platform_driver imxfb_driver = {
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.shutdown = imxfb_shutdown,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = imxfb_of_dev_id,
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},
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.id_table = imxfb_devtype,
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};
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