[PATCH v6 5/5] MIPS: ranchu: Add Ranchu as a new generic-based board

[Aleksandar Markovic]

From: Miodrag Dinic <miodrag.dinic@xxxxxxxx>

Provide amendments to the MIPS generic platform framework so that
the new generic-based board Ranchu can be chosen to be built.

Signed-off-by: Miodrag Dinic <miodrag.dinic@xxxxxxxx>
Signed-off-by: Goran Ferenc <goran.ferenc@xxxxxxxx>
Signed-off-by: Aleksandar Markovic <aleksandar.markovic@xxxxxxxx>
---
 MAINTAINERS                                   |  6 ++
 arch/mips/configs/generic/board-ranchu.config | 30 ++++++++++
 arch/mips/generic/Kconfig                     | 10 ++++
 arch/mips/generic/Makefile                    |  1 +
 arch/mips/generic/board-ranchu.c              | 79 +++++++++++++++++++++++++++
 5 files changed, 126 insertions(+)
 create mode 100644 arch/mips/configs/generic/board-ranchu.config
 create mode 100644 arch/mips/generic/board-ranchu.c

diff --git a/MAINTAINERS b/MAINTAINERS
index f1be016..e429cc2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11308,6 +11308,12 @@ S:	Maintained
 F:	Documentation/blockdev/ramdisk.txt
 F:	drivers/block/brd.c
 
+RANCHU VIRTUAL BOARD FOR MIPS
+M:	Miodrag Dinic <miodrag.dinic@xxxxxxxx>
+L:	linux-mips@xxxxxxxxxxxxxx
+S:	Supported
+F:	arch/mips/generic/board-ranchu.c
+
 RANDOM NUMBER DRIVER
 M:	"Theodore Ts'o" <tytso@xxxxxxx>
 S:	Maintained
diff --git a/arch/mips/configs/generic/board-ranchu.config b/arch/mips/configs/generic/board-ranchu.config
new file mode 100644
index 0000000..fee9ad4
--- /dev/null
+++ b/arch/mips/configs/generic/board-ranchu.config
@@ -0,0 +1,30 @@
+CONFIG_VIRT_BOARD_RANCHU=y
+
+CONFIG_BATTERY_GOLDFISH=y
+CONFIG_FB=y
+CONFIG_FB_GOLDFISH=y
+CONFIG_GOLDFISH=y
+CONFIG_STAGING=y
+CONFIG_GOLDFISH_AUDIO=y
+CONFIG_GOLDFISH_PIC=y
+CONFIG_GOLDFISH_PIPE=y
+CONFIG_GOLDFISH_TTY=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_GOLDFISH=y
+
+CONFIG_INPUT_EVDEV=y
+CONFIG_INPUT_KEYBOARD=y
+CONFIG_KEYBOARD_GOLDFISH_EVENTS=y
+
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_POWER_SUPPLY=y
+CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_SYSCON=y
+CONFIG_POWER_RESET_SYSCON_POWEROFF=y
+
+CONFIG_VIRTIO_BLK=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
diff --git a/arch/mips/generic/Kconfig b/arch/mips/generic/Kconfig
index e0436aa..93582be 100644
--- a/arch/mips/generic/Kconfig
+++ b/arch/mips/generic/Kconfig
@@ -42,4 +42,14 @@ config FIT_IMAGE_FDT_NI169445
 	  Enable this to include the FDT for the 169445 platform from
 	  National Instruments in the FIT kernel image.
 
+config VIRT_BOARD_RANCHU
+	bool "Ranchu platform for Android emulator"
+	help
+	  This enables support for the platform used by Android emulator.
+
+	  Ranchu platform consists of a set of virtual devices. This platform
+	  enables emulation of variety of virtual configurations while using
+	  Android emulator. Android emulator is based on Qemu, and contains
+	  the support for the same set of virtual devices.
+
 endif
diff --git a/arch/mips/generic/Makefile b/arch/mips/generic/Makefile
index 56b3ea5..2fee84a 100644
--- a/arch/mips/generic/Makefile
+++ b/arch/mips/generic/Makefile
@@ -15,3 +15,4 @@ obj-y += proc.o
 obj-$(CONFIG_YAMON_DT_SHIM)		+= yamon-dt.o
 obj-$(CONFIG_LEGACY_BOARD_SEAD3)	+= board-sead3.o
 obj-$(CONFIG_KEXEC)			+= kexec.o
+obj-$(CONFIG_VIRT_BOARD_RANCHU)	+= board-ranchu.o
diff --git a/arch/mips/generic/board-ranchu.c b/arch/mips/generic/board-ranchu.c
new file mode 100644
index 0000000..0397752
--- /dev/null
+++ b/arch/mips/generic/board-ranchu.c
@@ -0,0 +1,79 @@
+/*
+ * Support code for virtual Ranchu board for MIPS.
+ *
+ * Author: Miodrag Dinic <miodrag.dinic@xxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/of_address.h>
+
+#include <asm/machine.h>
+#include <asm/time.h>
+
+#define GOLDFISH_TIMER_LOW		0x00
+#define GOLDFISH_TIMER_HIGH		0x04
+
+static __init uint64_t read_rtc_time(void __iomem *base)
+{
+	u64 time_low;
+	u64 time_high;
+
+	time_low = readl(base + GOLDFISH_TIMER_LOW);
+	time_high = readl(base + GOLDFISH_TIMER_HIGH);
+
+	return (time_high << 32) | time_low;
+}
+
+static __init unsigned int ranchu_measure_hpt_freq(void)
+{
+	u64 rtc_start, rtc_current, rtc_delta;
+	unsigned int start, count;
+	struct device_node *np;
+	void __iomem *rtc_base;
+
+	np = of_find_compatible_node(NULL, NULL, "google,goldfish-rtc");
+	if (!np)
+		panic("%s(): Failed to find 'google,goldfish-rtc' dt node!",
+		      __func__);
+
+	rtc_base = of_iomap(np, 0);
+	if (!rtc_base)
+		panic("%s(): Failed to ioremap Goldfish RTC base!", __func__);
+
+	/*
+	 * poll the nanosecond resolution RTC for 1 second
+	 * to calibrate the CPU frequency
+	 */
+	rtc_start = read_rtc_time(rtc_base);
+	start = read_c0_count();
+
+	do {
+		rtc_current = read_rtc_time(rtc_base);
+		rtc_delta = rtc_current - rtc_start;
+	} while (rtc_delta < NSEC_PER_SEC);
+
+	count = read_c0_count() - start;
+
+	count += 5000;	/* round */
+	count -= count % 10000;
+
+	return count;
+}
+
+static const struct of_device_id ranchu_of_match[];
+
+MIPS_MACHINE(ranchu) = {
+	.matches = ranchu_of_match,
+	.measure_hpt_freq = ranchu_measure_hpt_freq,
+};
+
+static const struct of_device_id ranchu_of_match[] = {
+	{
+		.compatible = "mti,ranchu",
+		.data = &__mips_mach_ranchu,
+	},
+};
-- 
2.7.4