#include <linux/amba/clcd-regs.h>
#include <linux/device.h>
#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <drm/drmP.h>
#include "pl111_versatile.h"
+#include "pl111_vexpress.h"
#include "pl111_drm.h"
static struct regmap *versatile_syscon_map;
REALVIEW_CLCD_PB11MP,
REALVIEW_CLCD_PBA8,
REALVIEW_CLCD_PBX,
+ VEXPRESS_CLCD_V2M,
};
static const struct of_device_id versatile_clcd_of_match[] = {
.compatible = "arm,realview-pbx-syscon",
.data = (void *)REALVIEW_CLCD_PBX,
},
+ {
+ .compatible = "arm,vexpress-muxfpga",
+ .data = (void *)VEXPRESS_CLCD_V2M,
+ },
{},
};
.fb_bpp = 16,
};
+/*
+ * Versatile Express PL111 variant, again we just push the maximum
+ * BPP to 16 to be able to get 1024x768 without saturating the memory
+ * bus. The clockdivider also seems broken on the Versatile Express.
+ */
+static const struct pl111_variant_data pl111_vexpress = {
+ .name = "PL111 Versatile Express",
+ .formats = pl111_realview_pixel_formats,
+ .nformats = ARRAY_SIZE(pl111_realview_pixel_formats),
+ .fb_bpp = 16,
+ .broken_clockdivider = true,
+};
+
int pl111_versatile_init(struct device *dev, struct pl111_drm_dev_private *priv)
{
const struct of_device_id *clcd_id;
enum versatile_clcd versatile_clcd_type;
struct device_node *np;
struct regmap *map;
+ int ret;
np = of_find_matching_node_and_match(NULL, versatile_clcd_of_match,
&clcd_id);
}
versatile_clcd_type = (enum versatile_clcd)clcd_id->data;
- map = syscon_node_to_regmap(np);
+ /* Versatile Express special handling */
+ if (versatile_clcd_type == VEXPRESS_CLCD_V2M) {
+ struct platform_device *pdev;
+
+ /* Call into deep Vexpress configuration API */
+ pdev = of_find_device_by_node(np);
+ if (!pdev) {
+ dev_err(dev, "can't find the sysreg device, deferring\n");
+ return -EPROBE_DEFER;
+ }
+ map = dev_get_drvdata(&pdev->dev);
+ if (!map) {
+ dev_err(dev, "sysreg has not yet probed\n");
+ platform_device_put(pdev);
+ return -EPROBE_DEFER;
+ }
+ } else {
+ map = syscon_node_to_regmap(np);
+ }
+
if (IS_ERR(map)) {
dev_err(dev, "no Versatile syscon regmap\n");
return PTR_ERR(map);
priv->variant_display_disable = pl111_realview_clcd_disable;
dev_info(dev, "set up callbacks for RealView PL111\n");
break;
+ case VEXPRESS_CLCD_V2M:
+ priv->variant = &pl111_vexpress;
+ dev_info(dev, "initializing Versatile Express PL111\n");
+ ret = pl111_vexpress_clcd_init(dev, priv, map);
+ if (ret)
+ return ret;
+ break;
default:
dev_info(dev, "unknown Versatile system controller\n");
break;
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Versatile Express PL111 handling
+ * Copyright (C) 2018 Linus Walleij
+ *
+ * This module binds to the "arm,vexpress-muxfpga" device on the
+ * Versatile Express configuration bus and sets up which CLCD instance
+ * gets muxed out on the DVI bridge.
+ */
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/vexpress.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include "pl111_drm.h"
+#include "pl111_vexpress.h"
+
+#define VEXPRESS_FPGAMUX_MOTHERBOARD 0x00
+#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_1 0x01
+#define VEXPRESS_FPGAMUX_DAUGHTERBOARD_2 0x02
+
+int pl111_vexpress_clcd_init(struct device *dev,
+ struct pl111_drm_dev_private *priv,
+ struct regmap *map)
+{
+ struct device_node *root;
+ struct device_node *child;
+ struct device_node *ct_clcd = NULL;
+ bool has_coretile_clcd = false;
+ bool has_coretile_hdlcd = false;
+ bool mux_motherboard = true;
+ u32 val;
+ int ret;
+
+ /*
+ * Check if we have a CLCD or HDLCD on the core tile by checking if a
+ * CLCD or HDLCD is available in the root of the device tree.
+ */
+ root = of_find_node_by_path("/");
+ if (!root)
+ return -EINVAL;
+
+ for_each_available_child_of_node(root, child) {
+ if (of_device_is_compatible(child, "arm,pl111")) {
+ has_coretile_clcd = true;
+ ct_clcd = child;
+ break;
+ }
+ if (of_device_is_compatible(child, "arm,hdlcd")) {
+ has_coretile_hdlcd = true;
+ break;
+ }
+ }
+
+ /*
+ * If there is a coretile HDLCD and it has a driver,
+ * do not mux the CLCD on the motherboard to the DVI.
+ */
+ if (has_coretile_hdlcd && IS_ENABLED(CONFIG_DRM_HDLCD))
+ mux_motherboard = false;
+
+ /*
+ * On the Vexpress CA9 we let the CLCD on the coretile
+ * take precedence, so also in this case do not mux the
+ * motherboard to the DVI.
+ */
+ if (has_coretile_clcd)
+ mux_motherboard = false;
+
+ if (mux_motherboard) {
+ dev_info(dev, "DVI muxed to motherboard CLCD\n");
+ val = VEXPRESS_FPGAMUX_MOTHERBOARD;
+ } else if (ct_clcd == dev->of_node) {
+ dev_info(dev,
+ "DVI muxed to daughterboard 1 (core tile) CLCD\n");
+ val = VEXPRESS_FPGAMUX_DAUGHTERBOARD_1;
+ } else {
+ dev_info(dev, "core tile graphics present\n");
+ dev_info(dev, "this device will be deactivated\n");
+ return -ENODEV;
+ }
+
+ ret = regmap_write(map, 0, val);
+ if (ret) {
+ dev_err(dev, "error setting DVI muxmode\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * This sets up the regmap pointer that will then be retrieved by
+ * the detection code in pl111_versatile.c and passed in to the
+ * pl111_vexpress_clcd_init() function above.
+ */
+static int vexpress_muxfpga_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct regmap *map;
+
+ map = devm_regmap_init_vexpress_config(&pdev->dev);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+ dev_set_drvdata(dev, map);
+
+ return 0;
+}
+
+static const struct of_device_id vexpress_muxfpga_match[] = {
+ { .compatible = "arm,vexpress-muxfpga", }
+};
+
+static struct platform_driver vexpress_muxfpga_driver = {
+ .driver = {
+ .name = "vexpress-muxfpga",
+ .of_match_table = of_match_ptr(vexpress_muxfpga_match),
+ },
+ .probe = vexpress_muxfpga_probe,
+};
+
+builtin_platform_driver(vexpress_muxfpga_driver);
projects / users / hch / configfs.git / commitdiff