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authorMiodrag Dinic <miodrag.dinic@mips.com>2017-12-29 18:41:47 +0300
committerJames Hogan <jhogan@kernel.org>2018-01-22 23:47:34 +0300
commitf2d0b0d5c1718487f8a27d3ca3ec0f05ca3adedd (patch)
treee976f6c89782265f3a4939967c904c2345cac74f /arch/mips/generic
parentcdf93470a065de6366f92b144ac48236ddfb1315 (diff)
downloadlinux-f2d0b0d5c1718487f8a27d3ca3ec0f05ca3adedd.tar.xz
MIPS: ranchu: Add Ranchu as a new generic-based board
Provide amendments to the MIPS generic platform framework so that the new generic-based board Ranchu can be chosen to be built. The Ranchu board is intended to be used by Android emulator. The name "Ranchu" originates from Android development community. "Goldfish" and "Ranchu" are terms used for two generations of virtual boards used by Android emulator. The name "Ranchu" is a newer one among the two, and this patch deals with Ranchu. However, for historical reasons, some devices/drivers still contain the name "Goldfish". MIPS Ranchu machine includes a number of Goldfish devices. The support for Virtio devices is also included. Ranchu board supports up to 16 Virtio devices which can be attached using Virtio MMIO Bus. This is summarized in the following picture: ABUS ||----MIPS CPU || | IRQs ||----Goldfish PIC------------(32)-------- || | | | | | | | | | ||----Goldfish TTY------ | | | | | | | | || | | | | | | | | ||----Goldfish RTC-------- | | | | | | | || | | | | | | | ||----Goldfish FB----------- | | | | | | || | | | | | | ||----Goldfish Events--------- | | | | | || | | | | | ||----Goldfish Audio------------ | | | | || | | | | ||----Goldfish Battery------------ | | | || | | | ||----Android PIPE------------------ | | || | | ||----Virtio MMIO Bus | | || | | | | | || | | (virtio-block)--------- | || (16) | | || | (virtio-net)------------------ Device Tree is created on the QEMU side based on the information about devices IO map and IRQ numbers. Kernel will load this DTB using UHI boot protocol DTB handover mode. Signed-off-by: Miodrag Dinic <miodrag.dinic@mips.com> Signed-off-by: Goran Ferenc <goran.ferenc@mips.com> Signed-off-by: Aleksandar Markovic <aleksandar.markovic@mips.com> Reviewed-by: James Hogan <jhogan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/18138/ Signed-off-by: James Hogan <jhogan@kernel.org>
Diffstat (limited to 'arch/mips/generic')
-rw-r--r--arch/mips/generic/Kconfig10
-rw-r--r--arch/mips/generic/Makefile1
-rw-r--r--arch/mips/generic/board-ranchu.c92
3 files changed, 103 insertions, 0 deletions
diff --git a/arch/mips/generic/Kconfig b/arch/mips/generic/Kconfig
index 52e0286a1612..2ff3b17bfab1 100644
--- a/arch/mips/generic/Kconfig
+++ b/arch/mips/generic/Kconfig
@@ -49,4 +49,14 @@ config FIT_IMAGE_FDT_XILFPGA
Enable this to include the FDT for the MIPSfpga platform
from Imagination Technologies in the FIT kernel image.
+config VIRT_BOARD_RANCHU
+ bool "Support 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 874967363dbb..5fb60c86537b 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 000000000000..ea451b89bb53
--- /dev/null
+++ b/arch/mips/generic/board-ranchu.c
@@ -0,0 +1,92 @@
+/*
+ * Support code for virtual Ranchu board for MIPS.
+ *
+ * Author: Miodrag Dinic <miodrag.dinic@mips.com>
+ *
+ * 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 <linux/types.h>
+
+#include <asm/machine.h>
+#include <asm/mipsregs.h>
+#include <asm/time.h>
+
+#define GOLDFISH_TIMER_LOW 0x00
+#define GOLDFISH_TIMER_HIGH 0x04
+
+static __init u64 read_rtc_time(void __iomem *base)
+{
+ u32 time_low;
+ u32 time_high;
+
+ /*
+ * Reading the low address latches the high value
+ * as well so there is no fear that we may read
+ * inaccurate high value.
+ */
+ time_low = readl(base + GOLDFISH_TIMER_LOW);
+ time_high = readl(base + GOLDFISH_TIMER_HIGH);
+
+ return ((u64)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 one
+ * 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;
+
+ /*
+ * Make sure the frequency will be a round number.
+ * Without this correction, the returned value may vary
+ * between subsequent emulation executions.
+ *
+ * TODO: Set this value using device tree.
+ */
+ count += 5000;
+ count -= count % 10000;
+
+ iounmap(rtc_base);
+
+ return count;
+}
+
+static const struct of_device_id ranchu_of_match[] __initconst = {
+ {
+ .compatible = "mti,ranchu",
+ },
+};
+
+MIPS_MACHINE(ranchu) = {
+ .matches = ranchu_of_match,
+ .measure_hpt_freq = ranchu_measure_hpt_freq,
+};