Versatile Express DVI output is driven by a Sii9022 chip. It can be
controller to a limited extend by the Motherboard Config Controller,
and that's what the driver is doing now. It is a temporary measure
till there's a full I2C driver for the chip.
Signed-off-by: Pawel Moll <pawel.moll@xxxxxxx>
---
drivers/video/Makefile | 1 +
drivers/video/vexpress-dvimode.c | 158 ++++++++++++++++++++++++++++++++++++++
2 files changed, 159 insertions(+)
create mode 100644 drivers/video/vexpress-dvimode.c
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 84c6083..9347e00 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -179,3 +179,4 @@ obj-$(CONFIG_OF_VIDEOMODE) += of_videomode.o
# platform specific output drivers
obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-muxfpga.o
+obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-dvimode.o
diff --git a/drivers/video/vexpress-dvimode.c b/drivers/video/vexpress-dvimode.c
new file mode 100644
index 0000000..85d5608
--- /dev/null
+++ b/drivers/video/vexpress-dvimode.c
@@ -0,0 +1,158 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2013 ARM Limited
+ */
+
+#define pr_fmt(fmt) "vexpress-dvimode: " fmt
+
+#include <linux/fb.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/vexpress.h>
+#include <video/display.h>
+#include <video/videomode.h>
+
+
+static struct vexpress_config_func *vexpress_dvimode_func;
+
+
+static int vexpress_dvimode_display_update(struct display_entity *display,
+ const struct videomode *mode)
+{
+ static const struct {
+ u32 hactive, vactive, dvimode;
+ } dvimodes[] = {
+ { 640, 480, 0 }, /* VGA */
+ { 800, 600, 1 }, /* SVGA */
+ { 1024, 768, 2 }, /* XGA */
+ { 1280, 1024, 3 }, /* SXGA */
+ { 1600, 1200, 4 }, /* UXGA */
+ { 1920, 1080, 5 }, /* HD1080 */
+ };
+ int err = -ENOENT;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dvimodes); i++) {
+ if (dvimodes[i].hactive == mode->hactive &&
+ dvimodes[i].vactive == mode->vactive) {
+ pr_debug("mode: %ux%u = %d\n", mode->hactive,
+ mode->vactive, dvimodes[i].dvimode);
+ err = vexpress_config_write(vexpress_dvimode_func, 0,
+ dvimodes[i].dvimode);
+ break;
+ }
+ }
+
+ if (err)
+ pr_warn("Failed to set %ux%u mode! (%d)\n", mode->hactive,
+ mode->vactive, err);
+
+ return err;
+}
+
+static int vexpress_dvimode_display_get_modes(struct display_entity *display,
+ const struct videomode **modes)
+{
+ static const struct videomode m[] = {
+ {
+ /* VGA */
+ .pixelclock = 25175000,
+ .hactive = 640,
+ .hback_porch = 40,
+ .hfront_porch = 24,
+ .vfront_porch = 11,
+ .hsync_len = 96,
+ .vactive = 480,
+ .vback_porch = 32,
+ .vsync_len = 2,
+ }, {
+ /* XGA */
+ .pixelclock = 63500127,
+ .hactive = 1024,
+ .hback_porch = 152,
+ .hfront_porch = 48,
+ .hsync_len = 104,
+ .vactive = 768,
+ .vback_porch = 23,
+ .vfront_porch = 3,
+ .vsync_len = 4,
+ }, {
+ /* SXGA */
+ .pixelclock = 108000000,
+ .hactive = 1280,
+ .hback_porch = 248,
+ .hfront_porch = 48,
+ .hsync_len = 112,
+ .vactive = 1024,
+ .vback_porch = 38,
+ .vfront_porch = 1,
+ .vsync_len = 3,
+ },
+ };
+
+ *modes = m;
+
+ return ARRAY_SIZE(m);
+}
+
+static int vexpress_dvimode_display_get_params(struct display_entity *display,
+ struct display_entity_interface_params *params)
+{
+ params->type = DISPLAY_ENTITY_INTERFACE_TFT_PARALLEL;
+ params->p.tft_parallel.r_bits = 8;
+ params->p.tft_parallel.g_bits = 8;
+ params->p.tft_parallel.b_bits = 8;
+ params->p.tft_parallel.r_b_swapped = 0;
+
+ return 0;
+}
+
+static const struct display_entity_control_ops vexpress_dvimode_display_ops = {
+ .update = vexpress_dvimode_display_update,
+ .get_modes = vexpress_dvimode_display_get_modes,
+ .get_params = vexpress_dvimode_display_get_params,
+};
+
+static struct display_entity vexpress_dvimode_display = {
+ .ops.ctrl = &vexpress_dvimode_display_ops,
+};
+
+static struct of_device_id vexpress_dvimode_of_match[] = {
+ { .compatible = "arm,vexpress-dvimode", },
+ {}
+};
+
+static int vexpress_dvimode_probe(struct platform_device *pdev)
+{
+ vexpress_dvimode_func = vexpress_config_func_get_by_dev(&pdev->dev);
+
+ vexpress_dvimode_display.dev = &pdev->dev;
+ display_entity_register(&vexpress_dvimode_display);
+ of_display_entity_add_provider(pdev->dev.of_node,
+ of_display_entity_provider_simple_get,
+ &vexpress_dvimode_display);
+
+ return 0;
+}
+
+static struct platform_driver vexpress_dvimode_driver = {
+ .probe = vexpress_dvimode_probe,
+ .driver = {
+ .name = "vexpress-dvimode",
+ .of_match_table = vexpress_dvimode_of_match,
+ },
+};
+
+static int __init vexpress_dvimode_init(void)
+{
+ return platform_driver_register(&vexpress_dvimode_driver);
+}
+device_initcall(vexpress_dvimode_init);
--
1.7.10.4
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