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authorAntony Pavlov <antonynpavlov@gmail.com>2013-05-07 12:51:25 +0400
committerSascha Hauer <s.hauer@pengutronix.de>2013-05-08 09:37:20 +0200
commit2d4cf6d95deae61f0d55ec7a8c2b746ebd4e2c1b (patch)
tree558d52d661c6534334af400a88502f1743c4b5db /arch/mips/mach-xburst
parenta7ae099b365295202c2ce02b396e1d9c79a13c67 (diff)
downloadbarebox-2d4cf6d95deae61f0d55ec7a8c2b746ebd4e2c1b.tar.gz
barebox-2d4cf6d95deae61f0d55ec7a8c2b746ebd4e2c1b.tar.xz
MIPS: xburst: use common serial code
The Ingenic JZ4740, JZ4755 and JZ4770 SoCs use the same IP core for UART interface. This IP core is NS16550-compatible, but it needs small workaround. This commit moves the UART code for Ingenic SoCs from board level to machine level. So the code can be reused for different boards or even different SoCs. Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/mips/mach-xburst')
-rw-r--r--arch/mips/mach-xburst/Makefile1
-rw-r--r--arch/mips/mach-xburst/include/mach/devices.h8
-rw-r--r--arch/mips/mach-xburst/serial.c60
3 files changed, 69 insertions, 0 deletions
diff --git a/arch/mips/mach-xburst/Makefile b/arch/mips/mach-xburst/Makefile
index e5634ba9cc..3e0cd7324e 100644
--- a/arch/mips/mach-xburst/Makefile
+++ b/arch/mips/mach-xburst/Makefile
@@ -1 +1,2 @@
+obj-y += serial.o
obj-$(CONFIG_CPU_JZ4755) += csrc-jz4750.o reset-jz4750.o
diff --git a/arch/mips/mach-xburst/include/mach/devices.h b/arch/mips/mach-xburst/include/mach/devices.h
new file mode 100644
index 0000000000..931749d424
--- /dev/null
+++ b/arch/mips/mach-xburst/include/mach/devices.h
@@ -0,0 +1,8 @@
+#ifndef __MACH_XBURST_DEVICES_H
+#define __MACH_XBURST_DEVICES_H
+
+#include <driver.h>
+
+struct device_d *jz_add_uart(int id, unsigned long base, unsigned int clock);
+
+#endif /* __MACH_XBURST_DEVICES_H */
diff --git a/arch/mips/mach-xburst/serial.c b/arch/mips/mach-xburst/serial.c
new file mode 100644
index 0000000000..acf5648467
--- /dev/null
+++ b/arch/mips/mach-xburst/serial.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2013 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * Based on the linux kernel JZ4740 serial support:
+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * This file is part of barebox.
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * 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.
+ *
+ */
+
+#include <common.h>
+#include <ns16550.h>
+#include <io.h>
+#include <mach/devices.h>
+
+#define JZ_UART_SHIFT 2
+
+#define ier (1 << JZ_UART_SHIFT)
+#define fcr (2 << JZ_UART_SHIFT)
+
+static void jz_serial_reg_write(unsigned int val, unsigned long base,
+ unsigned char reg_offset)
+{
+ switch (reg_offset) {
+ case fcr:
+ val |= 0x10; /* Enable uart module */
+ break;
+ case ier:
+ val |= (val & 0x4) << 2;
+ break;
+ default:
+ break;
+ }
+
+ writeb(val & 0xff, (void *)(base + reg_offset));
+}
+
+struct device_d *jz_add_uart(int id, unsigned long base, unsigned int clock)
+{
+ struct NS16550_plat *serial_plat;
+
+ serial_plat = xzalloc(sizeof(*serial_plat));
+
+ serial_plat->shift = JZ_UART_SHIFT;
+ serial_plat->reg_write = &jz_serial_reg_write;
+ serial_plat->clock = clock;
+
+ return add_ns16550_device(id, base, 8 << JZ_UART_SHIFT,
+ IORESOURCE_MEM_8BIT, serial_plat);
+}