rockchip: Add serial support

Add support for the Rockchip serial device using the ns16550 driver.
This uses driver model and device tree for both SPL and U-Boot proper.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 4f6a3b87a137bdb6c51e4cd0b5196da8e9c9e50d..7ddda9f205599c8e884652828febf26968eccaec 100644 (file)
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -109,6 +109,15 @@ config DEBUG_UART_SHIFT
          value. Use this value to specify the shift to use, where 0=byte
          registers, 2=32-bit word registers, etc.
 
+config ROCKCHIP_SERIAL
+       bool "Rockchip on-chip UART support"
+       depends on ARCH_UNIPHIER && DM_SERIAL
+       help
+         Select this to enable a debug UART for Rockchip devices. This uses
+         the ns16550 driver. You will need to #define CONFIG_SYS_NS16550 in
+         your board config header. The clock input is automatically set to
+         use the oscillator (24MHz).
+
 config SANDBOX_SERIAL
        bool "Sandbox UART support"
        depends on SANDBOX && DM

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 1d1f0361cd71a40bf0585a0a2216945a977cdc68..869ea7b8fb46fe1d08abfaee46ab64782e5d0216 100644 (file)
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_ZYNQ_SERIAL) += serial_zynq.o
 obj-$(CONFIG_BFIN_SERIAL) += serial_bfin.o
 obj-$(CONFIG_FSL_LPUART) += serial_lpuart.o
 obj-$(CONFIG_MXS_AUART) += mxs_auart.o
+obj-$(CONFIG_ROCKCHIP_SERIAL) += serial_rockchip.o
 obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
 obj-$(CONFIG_TEGRA_SERIAL) += serial_tegra.o
 obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o

diff --git a/drivers/serial/serial_rockchip.c b/drivers/serial/serial_rockchip.c
new file mode 100644 (file)
index 0000000..0e7bbfc
--- /dev/null
+++ b/drivers/serial/serial_rockchip.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <ns16550.h>
+#include <serial.h>
+#include <asm/arch/clock.h>
+
+static const struct udevice_id rockchip_serial_ids[] = {
+       { .compatible = "rockchip,rk3288-uart" },
+       { }
+};
+
+static int rockchip_serial_ofdata_to_platdata(struct udevice *dev)
+{
+       struct ns16550_platdata *plat = dev_get_platdata(dev);
+       int ret;
+
+       ret = ns16550_serial_ofdata_to_platdata(dev);
+       if (ret)
+               return ret;
+
+       /* Do all Rockchip parts use 24MHz? */
+       plat->clock = 24 * 1000000;
+
+       return 0;
+}
+
+U_BOOT_DRIVER(serial_ns16550) = {
+       .name   = "serial_rockchip",
+       .id     = UCLASS_SERIAL,
+       .of_match = rockchip_serial_ids,
+       .ofdata_to_platdata = rockchip_serial_ofdata_to_platdata,
+       .platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
+       .priv_auto_alloc_size = sizeof(struct NS16550),
+       .probe = ns16550_serial_probe,
+       .ops    = &ns16550_serial_ops,
+       .flags  = DM_FLAG_PRE_RELOC,
+};