Add device tree based discovery support for Samsung's display controller framebuffer driver.
Cc: Jingoo Han <[email protected]> Cc: Grant Likely <[email protected]> Cc: Rob Herring <[email protected]> Signed-off-by: Thomas Abraham <[email protected]> --- .../devicetree/bindings/fb/samsung-fb.txt | 148 +++++++++++++ drivers/video/s3c-fb.c | 230 +++++++++++++++++++- 2 files changed, 370 insertions(+), 8 deletions(-) create mode 100644 Documentation/devicetree/bindings/fb/samsung-fb.txt diff --git a/Documentation/devicetree/bindings/fb/samsung-fb.txt b/Documentation/devicetree/bindings/fb/samsung-fb.txt new file mode 100644 index 0000000..612bd9f --- /dev/null +++ b/Documentation/devicetree/bindings/fb/samsung-fb.txt @@ -0,0 +1,148 @@ +* Samsung Display Controller Framebuffer Controller + +The display controller is used to transfer image data from memory to a +external display device such as an RGB interface LCD panel. It supports +various color formats such as rgb and yuv. It also supports multiple window +overlays. + +Required properties: + + - compatible: should be one of the following + - samsung,exynos4210-fimd: for fimd compatible with Exynos4210 fimd + - samsung,s5pv210-fimd: for fimd compatible with s5pv210 fimd + + - reg: physical base address of the controller and length of memory + mapped region. + + - interrupts: Three interrupts should be specified. The format of the + interrupt specifier depends on the interrupt controller. The interrupts + should be specified in the following order. + - VSYNC (Video Frame) interrupt + - Video FIFO level interrupt + - FIMD System Interrupt + + - gpios: The gpios used to interface with the external LCD panel. For a + panel with rgb interface, the gpio interface consists of video data + lines, HSYNC, VSYNC, Pixel Clock and Data Enable. The gpio's used for + these interface lines can be listed under this property in any order. + + - samsung,fimd-display: The fimd controller is interfaced with the a + display device such as a lcd panel. This property should specify the + phandle of the display device node. For a display device node that + represents a RGB type display interface, it is expected to specify the + video interface timing using the following properties. + + - lcd-htiming: Specifies the horizontal timing for the overlay. The + horizontal timing includes four parameters in the following order. + + - horizontal back porch (in number of lcd clocks) + - horizontal front porch (in number of lcd clocks) + - hsync pulse width (in number of lcd clocks) + - Display panels X resolution. + + - lcd-vtiming: Specifies the vertical timing for the overlay. The + vertical timing includes four parameters in the following order. + + - vertical back porch (in number of lcd lines) + - vertical front porch (in number of lcd lines) + - vsync pulse width (in number of lcd clocks) + - Y resolution. + + - Overlay/Windows: Multiple overlays/windows can be specified as child + nodes. Each window should have the following properties (optional + window properties are marked as 'optional'). + + - samsung,fimd-win-id: Specifies the window number of the fimd controller. + + - samsung,fimd-win-bpp: Specifies the bits per pixel. Two values should + be specified in the following order. + - default-bpp: bpp supported by the overlay. + - max-bpp: maximum required bpp for the overlay. + + - samsung,fimd-win-res: (OPTIONAL) Specifies the window resolution in + pixels. The resolution contains the X and Y pixel values with X being + specified first. If this property is not specified, the window + resolution is set to be equal to the display panel resolution. + + - samsung,fimd-win-virtres: (OPTIONAL) Specifies the resolution of the + virtual frame buffer for the window. The resolution contains the X + and Y resolution in pixels with value of X being the specified first. + +Optional properties: + + - samsung,fimd-vidout-rgb: Video output format is RGB. + - samsung,fimd-inv-hsync: invert hsync pulse polarity. + - samsung,fimd-inv-vsync: invert vsync pulse polarity. + - samsung,fimd-inv-vclk: invert video clock polarity. + - samsung,fimd-inv-vden: invert video enable signal polarity. + - samsung,fimd-frame-rate: Number of video frames per second. + +Example: + + The following is an example for the fimd framebuffer controller is split + into two portions. The SoC specific portion can be specified in the SoC + specific dts file. The board specific portion can be specified in the + board specific dts file. + + - SoC Specific portion + + fimd@11C00000 { + compatible = "samsung,exynos4210-fimd"; + interrupt-parent = <&combiner>; + reg = <0x11C00000 0x8000>; + interrupts = <11 1>, <11 0>, <11 2>; + }; + + - Board Specific portion + + fimd@11C00000 { + samsung,fimd-display = <&lcd_fimd0>; + samsung,fimd-vidout-rgb; + samsung,fimd-inv-hsync; + samsung,fimd-inv-vsync; + samsung,fimd-inv-vclk; + samsung,fimd-frame-rate = <60>; + + gpios = <&gpf0 0 2 0 0>, + <&gpf0 1 2 0 0>, + <&gpf0 2 2 0 0>, + <&gpf0 3 2 0 0>, + <&gpf0 4 2 0 0>, + <&gpf0 5 2 0 0>, + <&gpf0 6 2 0 0>, + <&gpf0 7 2 0 0>, + <&gpf1 0 2 0 0>, + <&gpf1 1 2 0 0>, + <&gpf1 2 2 0 0>, + <&gpf1 3 2 0 0>, + <&gpf1 4 2 0 0>, + <&gpf1 5 2 0 0>, + <&gpf1 6 2 0 0>, + <&gpf1 7 2 0 0>, + <&gpf2 0 2 0 0>, + <&gpf2 1 2 0 0>, + <&gpf2 2 2 0 0>, + <&gpf2 3 2 0 0>, + <&gpf2 4 2 0 0>, + <&gpf2 5 2 0 0>, + <&gpf2 6 2 0 0>, + <&gpf2 7 2 0 0>, + <&gpf3 0 2 0 0>, + <&gpf3 1 2 0 0>, + <&gpf3 2 2 0 0>, + <&gpf3 3 2 0 0>; + + window0 { + samsung,fimd-win-id = <0>; + samsung,fimd-win-bpp = <32 24>; + samsung,fimd-win-res = <512 300>; + samsung,fimd-win-vres = <1024 600>; + }; + + window1 { + samsung,fimd-win-id = <1>; + samsung,fimd-win-bpp = <32 24>; + samsung,fimd-win-res = <1024 200>; + samsung,fimd-win-vres = <1024 600>; + }; + }; diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c index 18c84b8..b8be668 100644 --- a/drivers/video/s3c-fb.c +++ b/drivers/video/s3c-fb.c @@ -24,6 +24,8 @@ #include <linux/uaccess.h> #include <linux/interrupt.h> #include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_gpio.h> #include <mach/map.h> #include <plat/regs-fb-v4.h> @@ -220,6 +222,7 @@ struct s3c_fb { int irq_no; unsigned long irq_flags; struct s3c_fb_vsync vsync_info; + int *gpios; }; /** @@ -1352,27 +1355,215 @@ static void s3c_fb_clear_win(struct s3c_fb *sfb, int win) writel(reg & ~SHADOWCON_WINx_PROTECT(win), regs + SHADOWCON); } +#ifdef CONFIG_OF +static int s3c_fb_dt_parse_gpios(struct device *dev, struct s3c_fb *sfb, + bool request) +{ + int nr_gpios, idx, gpio, ret; + + nr_gpios = sfb->pdata->win[0]->max_bpp + 4; + sfb->gpios = devm_kzalloc(dev, sizeof(int) * nr_gpios, GFP_KERNEL); + if (!sfb->gpios) { + dev_err(dev, "unable to allocate private data for gpio\n"); + return -ENOMEM; + } + + for (idx = 0; idx < nr_gpios; idx++) { + gpio = of_get_gpio(dev->of_node, idx); + if (!gpio_is_valid(gpio)) { + dev_err(dev, "invalid gpio[%d]: %d\n", idx, gpio); + return -EINVAL; + } + + if (!request) + continue; + + ret = gpio_request(gpio, "fimd"); + if (ret) { + dev_err(dev, "gpio [%d] request failed\n", gpio); + goto gpio_free; + } + sfb->gpios[idx] = gpio; + } + return 0; + +gpio_free: + while (--idx >= 0) + gpio_free(sfb->gpios[idx]); + return ret; +} + +static void s3c_fb_dt_free_gpios(struct s3c_fb *sfb) +{ + unsigned int idx, nr_gpio; + + nr_gpio = sfb->pdata->win[0]->max_bpp + 4; + for (idx = 0; idx < nr_gpio; idx++) + gpio_free(sfb->gpios[idx]); +} + +static struct s3c_fb_platdata *s3c_fb_dt_parse_pdata(struct device *dev) +{ + struct device_node *np = dev->of_node, *win_np; + struct device_node *disp_np; + struct s3c_fb_platdata *pd; + struct s3c_fb_pd_win *win; + u32 wnum = 0, data[4]; + + pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); + if (!pd) { + dev_err(dev, "memory allocation for pdata failed\n"); + return ERR_PTR(-ENOMEM); + } + + pd->vtiming = devm_kzalloc(dev, sizeof(*pd->vtiming), GFP_KERNEL); + if (!pd->vtiming) { + dev_err(dev, "memory allocation for vtiming failed\n"); + return ERR_PTR(-ENOMEM); + } + + if (of_get_property(np, "samsung,fimd-vidout-rgb", NULL)) + pd->vidcon0 |= VIDCON0_VIDOUT_RGB; + if (of_get_property(np, "samsung,fimd-vidout-tv", NULL)) + pd->vidcon0 |= VIDCON0_VIDOUT_TV; + if (of_get_property(np, "samsung,fimd-inv-hsync", NULL)) + pd->vidcon1 |= VIDCON1_INV_HSYNC; + if (of_get_property(np, "samsung,fimd-inv-vsync", NULL)) + pd->vidcon1 |= VIDCON1_INV_VSYNC; + if (of_get_property(np, "samsung,fimd-inv-vclk", NULL)) + pd->vidcon1 |= VIDCON1_INV_VCLK; + if (of_get_property(np, "samsung,fimd-inv-vden", NULL)) + pd->vidcon1 |= VIDCON1_INV_VDEN; + + disp_np = of_parse_phandle(np, "samsung,fimd-display", 0); + if (!disp_np) { + dev_err(dev, "unable to find display panel info\n"); + return ERR_PTR(-EINVAL); + } + + if (of_property_read_u32_array(disp_np, "lcd-htiming", data, 4)) { + dev_err(dev, "invalid horizontal timing\n"); + return ERR_PTR(-EINVAL); + } + pd->vtiming->left_margin = data[0]; + pd->vtiming->right_margin = data[1]; + pd->vtiming->hsync_len = data[2]; + pd->vtiming->xres = data[3]; + + if (of_property_read_u32_array(disp_np, "lcd-vtiming", data, 4)) { + dev_err(dev, "invalid vertical timing\n"); + return ERR_PTR(-EINVAL); + } + pd->vtiming->upper_margin = data[0]; + pd->vtiming->lower_margin = data[1]; + pd->vtiming->vsync_len = data[2]; + pd->vtiming->yres = data[3]; + + of_property_read_u32_array(np, "samsung,fimd-frame-rate", + &pd->vtiming->refresh, 1); + + for_each_child_of_node(np, win_np) { + if (of_property_read_u32_array(win_np, "samsung,fimd-win-id", + &wnum, 1)) { + dev_err(dev, "window id not specified\n"); + return ERR_PTR(-EINVAL); + } + + win = devm_kzalloc(dev, sizeof(*win), GFP_KERNEL); + if (!win) { + dev_err(dev, "no memory for window[%d] data\n", wnum); + return ERR_PTR(-ENOMEM); + } + pd->win[wnum] = win; + + if (of_property_read_u32_array(win_np, "samsung,fimd-win-bpp", + data, 2)) { + dev_err(dev, "invalid window bpp\n"); + return ERR_PTR(-EINVAL); + } + win->default_bpp = data[0]; + win->max_bpp = data[1]; + + if (of_property_read_u32_array(win_np, "samsung,fimd-win-res", + data, 2)) { + dev_info(dev, "window [%d] resolution not specified. " + "Using lcd resolution X[%d] and Y[%d]", wnum, + pd->vtiming->xres, pd->vtiming->yres); + win->xres = pd->vtiming->xres; + win->yres = pd->vtiming->yres; + } else { + win->xres = data[0]; + win->yres = data[1]; + } + + if (!of_property_read_u32_array(win_np, + "samsung,fimd-win-virtres", data, 2)) { + win->virtual_x = data[0]; + win->virtual_y = data[1]; + } + } + + return pd; +} +#else +static int s3c_fb_dt_parse_gpios(struct device *dev, struct s3c_fb *sfb, + bool request) +{ + return 0; +} + +static void s3c_fb_dt_free_gpios(struct s3c_fb *sfb) +{ + return 0; +} + +static int s3c_fb_dt_parse_pdata(struct device *dev, + struct s3c_fb_platdata **pdata) +{ + return 0; +} +#endif /* CONFIG_OF */ + +static const struct of_device_id s3c_fb_dt_match[]; + +static inline struct s3c_fb_driverdata *s3c_fb_get_driver_data( + struct platform_device *pdev) +{ +#ifdef CONFIG_OF + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(s3c_fb_dt_match, pdev->dev.of_node); + return (struct s3c_fb_driverdata *)match->data; + } +#endif + return (struct s3c_fb_driverdata *) + platform_get_device_id(pdev)->driver_data; +} + static int __devinit s3c_fb_probe(struct platform_device *pdev) { - const struct platform_device_id *platid; struct s3c_fb_driverdata *fbdrv; struct device *dev = &pdev->dev; - struct s3c_fb_platdata *pd; + struct s3c_fb_platdata *pd = pdev->dev.platform_data; struct s3c_fb *sfb; struct resource *res; int win; int ret = 0; u32 reg; - platid = platform_get_device_id(pdev); - fbdrv = (struct s3c_fb_driverdata *)platid->driver_data; + fbdrv = s3c_fb_get_driver_data(pdev); if (fbdrv->variant.nr_windows > S3C_FB_MAX_WIN) { dev_err(dev, "too many windows, cannot attach\n"); return -EINVAL; } - pd = pdev->dev.platform_data; + if (pdev->dev.of_node) { + pd = s3c_fb_dt_parse_pdata(&pdev->dev); + if (IS_ERR(pd)) + return PTR_ERR(pd); + } + if (!pd) { dev_err(dev, "no platform data specified\n"); return -EINVAL; @@ -1449,7 +1640,12 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev) /* setup gpio and output polarity controls */ - pd->setup_gpio(); + if (dev->of_node) { + if (s3c_fb_dt_parse_gpios(dev, sfb, true)) + goto err_lcd_clk; + } else { + pd->setup_gpio(); + } writel(pd->vidcon1, sfb->regs + VIDCON1); @@ -1499,6 +1695,7 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev) return 0; err_pm_runtime: + s3c_fb_dt_free_gpios(sfb); pm_runtime_put_sync(sfb->dev); err_lcd_clk: @@ -1545,6 +1742,7 @@ static int __devexit s3c_fb_remove(struct platform_device *pdev) pm_runtime_put_sync(sfb->dev); pm_runtime_disable(sfb->dev); + s3c_fb_dt_free_gpios(sfb); return 0; } @@ -1588,7 +1786,10 @@ static int s3c_fb_resume(struct device *dev) clk_enable(sfb->lcd_clk); /* setup gpio and output polarity controls */ - pd->setup_gpio(); + if (dev->of_node) + s3c_fb_dt_parse_gpios(dev, sfb, false); + else + pd->setup_gpio(); writel(pd->vidcon1, sfb->regs + VIDCON1); /* set video clock running at under-run */ @@ -1658,7 +1859,10 @@ static int s3c_fb_runtime_resume(struct device *dev) clk_enable(sfb->lcd_clk); /* setup gpio and output polarity controls */ - pd->setup_gpio(); + if (dev->of_node) + s3c_fb_dt_parse_gpios(dev, sfb, false); + else + pd->setup_gpio(); writel(pd->vidcon1, sfb->regs + VIDCON1); return 0; @@ -2028,6 +2232,15 @@ static struct platform_device_id s3c_fb_driver_ids[] = { }; MODULE_DEVICE_TABLE(platform, s3c_fb_driver_ids); +#ifdef CONFIG_OF +static const struct of_device_id s3c_fb_dt_match[] = { + { .compatible = "samsung,exynos4210-fimd", + .data = (void *)&s3c_fb_data_exynos4 }, + {}, +}; +MODULE_DEVICE_TABLE(of, s3c_fb_dt_match); +#endif + static const struct dev_pm_ops s3cfb_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(s3c_fb_suspend, s3c_fb_resume) SET_RUNTIME_PM_OPS(s3c_fb_runtime_suspend, s3c_fb_runtime_resume, @@ -2042,6 +2255,7 @@ static struct platform_driver s3c_fb_driver = { .name = "s3c-fb", .owner = THIS_MODULE, .pm = &s3cfb_pm_ops, + .of_match_table = of_match_ptr(s3c_fb_dt_match), }, }; -- 1.6.6.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
