Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Linus Walleij | 1254 | 98.20% | 2 | 20.00% |
Sam Ravnborg | 10 | 0.78% | 3 | 30.00% |
Laurent Pinchart | 7 | 0.55% | 3 | 30.00% |
Bernard Zhao | 3 | 0.23% | 1 | 10.00% |
Stefan Mavrodiev | 3 | 0.23% | 1 | 10.00% |
Total | 1277 | 10 |
// SPDX-License-Identifier: GPL-2.0 /* * Panel driver for the ARM Versatile family reference designs from * ARM Limited. * * Author: * Linus Walleij <linus.wallei@linaro.org> * * On the Versatile AB, these panels come mounted on daughterboards * named "IB1" or "IB2" (Interface Board 1 & 2 respectively.) They * are documented in ARM DUI 0225D Appendix C and D. These daughter * boards support TFT display panels. * * - The IB1 is a passive board where the display connector defines a * few wires for encoding the display type for autodetection, * suitable display settings can then be looked up from this setting. * The magic bits can be read out from the system controller. * * - The IB2 is a more complex board intended for GSM phone development * with some logic and a control register, which needs to be accessed * and the board display needs to be turned on explicitly. * * On the Versatile PB, a special CLCD adaptor board is available * supporting the same displays as the Versatile AB, plus one more * Epson QCIF display. * */ #include <linux/bitops.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/mfd/syscon.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <video/of_videomode.h> #include <video/videomode.h> #include <drm/drm_modes.h> #include <drm/drm_panel.h> /* * This configuration register in the Versatile and RealView * family is uniformly present but appears more and more * unutilized starting with the RealView series. */ #define SYS_CLCD 0x50 /* The Versatile can detect the connected panel type */ #define SYS_CLCD_CLCDID_MASK (BIT(8)|BIT(9)|BIT(10)|BIT(11)|BIT(12)) #define SYS_CLCD_ID_SANYO_3_8 (0x00 << 8) #define SYS_CLCD_ID_SHARP_8_4 (0x01 << 8) #define SYS_CLCD_ID_EPSON_2_2 (0x02 << 8) #define SYS_CLCD_ID_SANYO_2_5 (0x07 << 8) #define SYS_CLCD_ID_VGA (0x1f << 8) /* IB2 control register for the Versatile daughterboard */ #define IB2_CTRL 0x00 #define IB2_CTRL_LCD_SD BIT(1) /* 1 = shut down LCD */ #define IB2_CTRL_LCD_BL_ON BIT(0) #define IB2_CTRL_LCD_MASK (BIT(0)|BIT(1)) /** * struct versatile_panel_type - lookup struct for the supported panels */ struct versatile_panel_type { /** * @name: the name of this panel */ const char *name; /** * @magic: the magic value from the detection register */ u32 magic; /** * @mode: the DRM display mode for this panel */ struct drm_display_mode mode; /** * @bus_flags: the DRM bus flags for this panel e.g. inverted clock */ u32 bus_flags; /** * @width_mm: the panel width in mm */ u32 width_mm; /** * @height_mm: the panel height in mm */ u32 height_mm; /** * @ib2: the panel may be connected on an IB2 daughterboard */ bool ib2; }; /** * struct versatile_panel - state container for the Versatile panels */ struct versatile_panel { /** * @dev: the container device */ struct device *dev; /** * @panel: the DRM panel instance for this device */ struct drm_panel panel; /** * @panel_type: the Versatile panel type as detected */ const struct versatile_panel_type *panel_type; /** * @map: map to the parent syscon where the main register reside */ struct regmap *map; /** * @ib2_map: map to the IB2 syscon, if applicable */ struct regmap *ib2_map; }; static const struct versatile_panel_type versatile_panels[] = { /* * Sanyo TM38QV67A02A - 3.8 inch QVGA (320x240) Color TFT * found on the Versatile AB IB1 connector or the Versatile * PB adaptor board connector. */ { .name = "Sanyo TM38QV67A02A", .magic = SYS_CLCD_ID_SANYO_3_8, .width_mm = 79, .height_mm = 54, .mode = { .clock = 10000, .hdisplay = 320, .hsync_start = 320 + 6, .hsync_end = 320 + 6 + 6, .htotal = 320 + 6 + 6 + 6, .vdisplay = 240, .vsync_start = 240 + 5, .vsync_end = 240 + 5 + 6, .vtotal = 240 + 5 + 6 + 5, .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC, }, }, /* * Sharp LQ084V1DG21 640x480 VGA Color TFT module * found on the Versatile AB IB1 connector or the Versatile * PB adaptor board connector. */ { .name = "Sharp LQ084V1DG21", .magic = SYS_CLCD_ID_SHARP_8_4, .width_mm = 171, .height_mm = 130, .mode = { .clock = 25000, .hdisplay = 640, .hsync_start = 640 + 24, .hsync_end = 640 + 24 + 96, .htotal = 640 + 24 + 96 + 24, .vdisplay = 480, .vsync_start = 480 + 11, .vsync_end = 480 + 11 + 2, .vtotal = 480 + 11 + 2 + 32, .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC, }, }, /* * Epson L2F50113T00 - 2.2 inch QCIF 176x220 Color TFT * found on the Versatile PB adaptor board connector. */ { .name = "Epson L2F50113T00", .magic = SYS_CLCD_ID_EPSON_2_2, .width_mm = 34, .height_mm = 45, .mode = { .clock = 62500, .hdisplay = 176, .hsync_start = 176 + 2, .hsync_end = 176 + 2 + 3, .htotal = 176 + 2 + 3 + 3, .vdisplay = 220, .vsync_start = 220 + 0, .vsync_end = 220 + 0 + 2, .vtotal = 220 + 0 + 2 + 1, .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC, }, .bus_flags = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE, }, /* * Sanyo ALR252RGT 240x320 portrait display found on the * Versatile AB IB2 daughterboard for GSM prototyping. */ { .name = "Sanyo ALR252RGT", .magic = SYS_CLCD_ID_SANYO_2_5, .width_mm = 37, .height_mm = 50, .mode = { .clock = 5400, .hdisplay = 240, .hsync_start = 240 + 10, .hsync_end = 240 + 10 + 10, .htotal = 240 + 10 + 10 + 20, .vdisplay = 320, .vsync_start = 320 + 2, .vsync_end = 320 + 2 + 2, .vtotal = 320 + 2 + 2 + 2, .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, }, .bus_flags = DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE, .ib2 = true, }, }; static inline struct versatile_panel * to_versatile_panel(struct drm_panel *panel) { return container_of(panel, struct versatile_panel, panel); } static int versatile_panel_disable(struct drm_panel *panel) { struct versatile_panel *vpanel = to_versatile_panel(panel); /* If we're on an IB2 daughterboard, turn off display */ if (vpanel->ib2_map) { dev_dbg(vpanel->dev, "disable IB2 display\n"); regmap_update_bits(vpanel->ib2_map, IB2_CTRL, IB2_CTRL_LCD_MASK, IB2_CTRL_LCD_SD); } return 0; } static int versatile_panel_enable(struct drm_panel *panel) { struct versatile_panel *vpanel = to_versatile_panel(panel); /* If we're on an IB2 daughterboard, turn on display */ if (vpanel->ib2_map) { dev_dbg(vpanel->dev, "enable IB2 display\n"); regmap_update_bits(vpanel->ib2_map, IB2_CTRL, IB2_CTRL_LCD_MASK, IB2_CTRL_LCD_BL_ON); } return 0; } static int versatile_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector) { struct versatile_panel *vpanel = to_versatile_panel(panel); struct drm_display_mode *mode; connector->display_info.width_mm = vpanel->panel_type->width_mm; connector->display_info.height_mm = vpanel->panel_type->height_mm; connector->display_info.bus_flags = vpanel->panel_type->bus_flags; mode = drm_mode_duplicate(connector->dev, &vpanel->panel_type->mode); drm_mode_set_name(mode); mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; mode->width_mm = vpanel->panel_type->width_mm; mode->height_mm = vpanel->panel_type->height_mm; drm_mode_probed_add(connector, mode); return 1; } static const struct drm_panel_funcs versatile_panel_drm_funcs = { .disable = versatile_panel_disable, .enable = versatile_panel_enable, .get_modes = versatile_panel_get_modes, }; static int versatile_panel_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct versatile_panel *vpanel; struct device *parent; struct regmap *map; int ret; u32 val; int i; parent = dev->parent; if (!parent) { dev_err(dev, "no parent for versatile panel\n"); return -ENODEV; } map = syscon_node_to_regmap(parent->of_node); if (IS_ERR(map)) { dev_err(dev, "no regmap for versatile panel parent\n"); return PTR_ERR(map); } vpanel = devm_kzalloc(dev, sizeof(*vpanel), GFP_KERNEL); if (!vpanel) return -ENOMEM; ret = regmap_read(map, SYS_CLCD, &val); if (ret) { dev_err(dev, "cannot access syscon regs\n"); return ret; } val &= SYS_CLCD_CLCDID_MASK; for (i = 0; i < ARRAY_SIZE(versatile_panels); i++) { const struct versatile_panel_type *pt; pt = &versatile_panels[i]; if (pt->magic == val) { vpanel->panel_type = pt; break; } } /* No panel detected or VGA, let's leave this show */ if (i == ARRAY_SIZE(versatile_panels)) { dev_info(dev, "no panel detected\n"); return -ENODEV; } dev_info(dev, "detected: %s\n", vpanel->panel_type->name); vpanel->dev = dev; vpanel->map = map; /* Check if the panel is mounted on an IB2 daughterboard */ if (vpanel->panel_type->ib2) { vpanel->ib2_map = syscon_regmap_lookup_by_compatible( "arm,versatile-ib2-syscon"); if (IS_ERR(vpanel->ib2_map)) vpanel->ib2_map = NULL; else dev_info(dev, "panel mounted on IB2 daughterboard\n"); } drm_panel_init(&vpanel->panel, dev, &versatile_panel_drm_funcs, DRM_MODE_CONNECTOR_DPI); drm_panel_add(&vpanel->panel); return 0; } static const struct of_device_id versatile_panel_match[] = { { .compatible = "arm,versatile-tft-panel", }, {}, }; MODULE_DEVICE_TABLE(of, versatile_panel_match); static struct platform_driver versatile_panel_driver = { .probe = versatile_panel_probe, .driver = { .name = "versatile-tft-panel", .of_match_table = versatile_panel_match, }, }; module_platform_driver(versatile_panel_driver); MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); MODULE_DESCRIPTION("ARM Versatile panel driver"); MODULE_LICENSE("GPL v2");
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