diff options
Diffstat (limited to 'drivers/video/fbdev/pxafb.c')
| -rw-r--r-- | drivers/video/fbdev/pxafb.c | 160 |
1 files changed, 157 insertions, 3 deletions
diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c index ed4b1a5dc306..987eb8c4f926 100644 --- a/drivers/video/fbdev/pxafb.c +++ b/drivers/video/fbdev/pxafb.c @@ -55,6 +55,9 @@ #include <linux/kthread.h> #include <linux/freezer.h> #include <linux/console.h> +#include <linux/of_graph.h> +#include <video/of_display_timing.h> +#include <video/videomode.h> #include <mach/hardware.h> #include <asm/io.h> @@ -2092,6 +2095,148 @@ static void pxafb_check_options(struct device *dev, struct pxafb_mach_info *inf) #define pxafb_check_options(...) do {} while (0) #endif +#if defined(CONFIG_OF) +static const char * const lcd_types[] = { + "unknown", "mono-stn", "mono-dstn", "color-stn", "color-dstn", + "color-tft", "smart-panel", NULL +}; + +static int of_get_pxafb_display(struct device *dev, struct device_node *disp, + struct pxafb_mach_info *info, u32 bus_width) +{ + struct display_timings *timings; + struct videomode vm; + int i, ret = -EINVAL; + const char *s; + + ret = of_property_read_string(disp, "lcd-type", &s); + if (ret) + s = "color-tft"; + + for (i = 0; lcd_types[i]; i++) + if (!strcmp(s, lcd_types[i])) + break; + if (!i || !lcd_types[i]) { + dev_err(dev, "lcd-type %s is unknown\n", s); + return -EINVAL; + } + info->lcd_conn |= LCD_CONN_TYPE(i); + info->lcd_conn |= LCD_CONN_WIDTH(bus_width); + + timings = of_get_display_timings(disp); + if (!timings) + goto out; + + ret = -ENOMEM; + info->modes = kmalloc_array(timings->num_timings, + sizeof(info->modes[0]), GFP_KERNEL); + if (!info->modes) + goto out; + info->num_modes = timings->num_timings; + + for (i = 0; i < timings->num_timings; i++) { + ret = videomode_from_timings(timings, &vm, i); + if (ret) { + dev_err(dev, "videomode_from_timings %d failed: %d\n", + i, ret); + goto out; + } + if (vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE) + info->lcd_conn |= LCD_PCLK_EDGE_RISE; + if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) + info->lcd_conn |= LCD_PCLK_EDGE_FALL; + if (vm.flags & DISPLAY_FLAGS_DE_HIGH) + info->lcd_conn |= LCD_BIAS_ACTIVE_HIGH; + if (vm.flags & DISPLAY_FLAGS_DE_LOW) + info->lcd_conn |= LCD_BIAS_ACTIVE_LOW; + if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH) + info->modes[i].sync |= FB_SYNC_HOR_HIGH_ACT; + if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH) + info->modes[i].sync |= FB_SYNC_VERT_HIGH_ACT; + + info->modes[i].pixclock = 1000000000UL / (vm.pixelclock / 1000); + info->modes[i].xres = vm.hactive; + info->modes[i].yres = vm.vactive; + info->modes[i].hsync_len = vm.hsync_len; + info->modes[i].left_margin = vm.hback_porch; + info->modes[i].right_margin = vm.hfront_porch; + info->modes[i].vsync_len = vm.vsync_len; + info->modes[i].upper_margin = vm.vback_porch; + info->modes[i].lower_margin = vm.vfront_porch; + } + ret = 0; + +out: + display_timings_release(timings); + return ret; +} + +static int of_get_pxafb_mode_info(struct device *dev, + struct pxafb_mach_info *info) +{ + struct device_node *display, *np; + u32 bus_width; + int ret, i; + + np = of_graph_get_next_endpoint(dev->of_node, NULL); + if (!np) { + dev_err(dev, "could not find endpoint\n"); + return -EINVAL; + } + ret = of_property_read_u32(np, "bus-width", &bus_width); + if (ret) { + dev_err(dev, "no bus-width specified: %d\n", ret); + return ret; + } + + display = of_graph_get_remote_port_parent(np); + of_node_put(np); + if (!display) { + dev_err(dev, "no display defined\n"); + return -EINVAL; + } + + ret = of_get_pxafb_display(dev, display, info, bus_width); + of_node_put(display); + if (ret) + return ret; + + for (i = 0; i < info->num_modes; i++) + info->modes[i].bpp = bus_width; + + return 0; +} + +static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev) +{ + int ret; + struct pxafb_mach_info *info; + + if (!dev->of_node) + return NULL; + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return ERR_PTR(-ENOMEM); + ret = of_get_pxafb_mode_info(dev, info); + if (ret) { + kfree(info->modes); + return ERR_PTR(ret); + } + + /* + * On purpose, neither lccrX registers nor video memory size can be + * specified through device-tree, they are considered more a debug hack + * available through command line. + */ + return info; +} +#else +static struct pxafb_mach_info *of_pxafb_of_mach_info(struct device *dev) +{ + return NULL; +} +#endif + static int pxafb_probe(struct platform_device *dev) { struct pxafb_info *fbi; @@ -2104,8 +2249,7 @@ static int pxafb_probe(struct platform_device *dev) ret = -ENOMEM; pdata = dev_get_platdata(&dev->dev); inf = devm_kmalloc(&dev->dev, sizeof(*inf), GFP_KERNEL); - if (!inf) - goto failed; + if (pdata) { *inf = *pdata; inf->modes = @@ -2117,8 +2261,9 @@ static int pxafb_probe(struct platform_device *dev) inf->modes[i] = pdata->modes[i]; } - fbi = NULL; if (!pdata) + inf = of_pxafb_of_mach_info(&dev->dev); + if (IS_ERR_OR_NULL(inf)) goto failed; ret = pxafb_parse_options(&dev->dev, g_options, inf); @@ -2313,11 +2458,20 @@ static int pxafb_remove(struct platform_device *dev) return 0; } +static const struct of_device_id pxafb_of_dev_id[] = { + { .compatible = "marvell,pxa270-lcdc", }, + { .compatible = "marvell,pxa300-lcdc", }, + { .compatible = "marvell,pxa2xx-lcdc", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, pxafb_of_dev_id); + static struct platform_driver pxafb_driver = { .probe = pxafb_probe, .remove = pxafb_remove, .driver = { .name = "pxa2xx-fb", + .of_match_table = pxafb_of_dev_id, #ifdef CONFIG_PM .pm = &pxafb_pm_ops, #endif |