[PATCH v2 3/7] bus: add bus driver for accessing Allwinner A64 DE2

Icenowy Zheng
2018-06-22T12:45:36Z

The "Display Engine 2.0" (usually called DE2) on the Allwinner A64 SoC
is different from the ones on other Allwinner SoCs. It requires a SRAM
region to be claimed, otherwise all DE2 subblocks won't be accessible.

Add a bus driver for the Allwinner A64 DE2 part which claims the SRAM
region when probing.

Signed-off-by: Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org>
---
No changes since v1.

drivers/bus/Kconfig | 10 ++++++++
drivers/bus/Makefile | 1 +
drivers/bus/sun50i-de2.c | 49 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 60 insertions(+)
create mode 100644 drivers/bus/sun50i-de2.c

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index d1c0b60e9326..1851112ccc29 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -103,6 +103,16 @@ config SIMPLE_PM_BUS
Controller (BSC, sometimes called "LBSC within Bus Bridge", or
"External Bus Interface") as found on several Renesas ARM SoCs.

+config SUN50I_DE2_BUS
+ bool "Allwinner A64 DE2 Bus Driver"
+ default ARM64
+ depends on ARCH_SUNXI
+ select SUNXI_SRAM
+ help
+ Say y here to enable support for Allwinner A64 DE2 bus driver. It's
+ mostly transparent, but a SRAM region needs to be claimed in the SRAM
+ controller to make the all blocks in the DE2 part accessible.
+
config SUNXI_RSB
tristate "Allwinner sunXi Reduced Serial Bus Driver"
default MACH_SUN8I || MACH_SUN9I || ARM64
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index b8f036cca7ff..ca300b1914ce 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o

obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
obj-$(CONFIG_QCOM_EBI2) += qcom-ebi2.o
+obj-$(CONFIG_SUN50I_DE2_BUS) += sun50i-de2.o
obj-$(CONFIG_SUNXI_RSB) += sunxi-rsb.o
obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o
obj-$(CONFIG_TEGRA_ACONNECT) += tegra-aconnect.o
diff --git a/drivers/bus/sun50i-de2.c b/drivers/bus/sun50i-de2.c
new file mode 100644
index 000000000000..836828ef96d5
--- /dev/null
+++ b/drivers/bus/sun50i-de2.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Allwinner A64 Display Engine 2.0 Bus Driver
+ *
+ * Copyright (C) 2018 Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org>
+ */
+
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/soc/sunxi/sunxi_sram.h>
+
+static int sun50i_de2_bus_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+
+ ret = sunxi_sram_claim(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Error couldn't map SRAM to device\n");
+ return ret;
+ }
+
+ if (np)
+ of_platform_populate(np, NULL, NULL, &pdev->dev);
+
+ return 0;
+}
+
+static int sun50i_de2_bus_remove(struct platform_device *pdev)
+{
+ sunxi_sram_release(&pdev->dev);
+ return 0;
+}
+
+static const struct of_device_id sun50i_de2_bus_of_match[] = {
+ { .compatible = "allwinner,sun50i-a64-de2", },
+ { /* sentinel */ }
+};
+
+static struct platform_driver sun50i_de2_bus_driver = {
+ .probe = sun50i_de2_bus_probe,
+ .remove = sun50i_de2_bus_remove,
+ .driver = {
+ .name = "sun50i-de2-bus",
+ .of_match_table = sun50i_de2_bus_of_match,
+ },
+};
+
+builtin_platform_driver(sun50i_de2_bus_driver);
--
2.17.1