[U-Boot] [PATCH v1 3/4] serial: add an of-platdata driver for "snps, dw-apb-uart"

[Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>]

Add a driver for the "snps,dw-apb-uart" used in socfpga and others.

This driver is required to get OF_PLATDATA to work for socfpga.
It uses the ns16550 driver, converting the platdata from of-platdata
go the ns16550 format.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
---

 drivers/serial/Kconfig         | 10 ++++++++
 drivers/serial/Makefile        |  1 +
 drivers/serial/serial_dw_apb.c | 42 ++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 drivers/serial/serial_dw_apb.c

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index b7ff2960ab..10addd3309 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -511,6 +511,16 @@ config BCM283X_PL011_SERIAL
 	  that supports automatic disable, so that it only gets used when
 	  the UART is actually muxed.
 
+config DESIGNWARE_SERIAL
+	bool "DesignWare UART support"
+	depends on DM_SERIAL && SPL_OF_PLATDATA
+	help
+	  Select this to enable a UART driver for "snps,dw-apb-uart" devices
+	  when using CONFIG_SPL_OF_PLATDATA (i.e. a compiled-in device tree
+	  replacement).
+	  This uses the ns16550 driver, converting the platdata from of-platdata
+	  to the ns16550 format.
+
 config BCM6345_SERIAL
 	bool "Support for BCM6345 UART"
 	depends on DM_SERIAL
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 06ee30697d..f1ebb90d92 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_MESON_SERIAL) += serial_meson.o
 obj-$(CONFIG_INTEL_MID_SERIAL) += serial_intel_mid.o
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_ROCKCHIP_SERIAL) += serial_rockchip.o
+obj-$(CONFIG_DESIGNWARE_SERIAL) += serial_dw_apb.o
 endif
 obj-$(CONFIG_XILINX_UARTLITE) += serial_xuartlite.o
 obj-$(CONFIG_SANDBOX_SERIAL) += sandbox.o
diff --git a/drivers/serial/serial_dw_apb.c b/drivers/serial/serial_dw_apb.c
new file mode 100644
index 0000000000..26580e5ba5
--- /dev/null
+++ b/drivers/serial/serial_dw_apb.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2018 Simon Goldschmidt
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <ns16550.h>
+#include <serial.h>
+
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+struct dw_apb_uart_platdata {
+	struct dtd_snps_dw_apb_uart dtplat;
+	struct ns16550_platdata plat;
+};
+
+static int dw_apb_serial_probe(struct udevice *dev)
+{
+	struct dw_apb_uart_platdata *plat = dev_get_platdata(dev);
+
+	/* Set up correct platform data for the standard driver */
+	plat->plat.base = plat->dtplat.reg[0];
+	plat->plat.reg_shift = plat->dtplat.reg_shift;
+	plat->plat.reg_width = plat->dtplat.reg_io_width;
+	plat->plat.clock = plat->dtplat.clock_frequency;
+	plat->plat.fcr = UART_FCR_DEFVAL;
+	dev->platdata = &plat->plat;
+
+	return ns16550_serial_probe(dev);
+}
+
+U_BOOT_DRIVER(snps_dw_apb_uart) = {
+	.name	= "snps_dw_apb_uart",
+	.id	= UCLASS_SERIAL,
+	.priv_auto_alloc_size = sizeof(struct NS16550),
+	.platdata_auto_alloc_size = sizeof(struct dw_apb_uart_platdata),
+	.probe	= dw_apb_serial_probe,
+	.ops	= &ns16550_serial_ops,
+	.flags	= DM_FLAG_PRE_RELOC,
+};
+#endif
-- 
2.17.1