diff options
Diffstat (limited to 'arch/mips/generic')
| -rw-r--r-- | arch/mips/generic/Kconfig | 10 | ||||
| -rw-r--r-- | arch/mips/generic/Makefile | 1 | ||||
| -rw-r--r-- | arch/mips/generic/board-ranchu.c | 93 | ||||
| -rw-r--r-- | arch/mips/generic/irq.c | 18 |
4 files changed, 113 insertions, 9 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..5c31e0c4697d 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..59a8c18fa2cc --- /dev/null +++ b/arch/mips/generic/board-ranchu.c @@ -0,0 +1,93 @@ +/* + * 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, +}; diff --git a/arch/mips/generic/irq.c b/arch/mips/generic/irq.c index 394f8161e462..cb7fdaeef426 100644 --- a/arch/mips/generic/irq.c +++ b/arch/mips/generic/irq.c @@ -22,10 +22,10 @@ int get_c0_fdc_int(void) { int mips_cpu_fdc_irq; - if (cpu_has_veic) - panic("Unimplemented!"); - else if (mips_gic_present()) + if (mips_gic_present()) mips_cpu_fdc_irq = gic_get_c0_fdc_int(); + else if (cpu_has_veic) + panic("Unimplemented!"); else if (cp0_fdc_irq >= 0) mips_cpu_fdc_irq = MIPS_CPU_IRQ_BASE + cp0_fdc_irq; else @@ -38,10 +38,10 @@ int get_c0_perfcount_int(void) { int mips_cpu_perf_irq; - if (cpu_has_veic) - panic("Unimplemented!"); - else if (mips_gic_present()) + if (mips_gic_present()) mips_cpu_perf_irq = gic_get_c0_perfcount_int(); + else if (cpu_has_veic) + panic("Unimplemented!"); else if (cp0_perfcount_irq >= 0) mips_cpu_perf_irq = MIPS_CPU_IRQ_BASE + cp0_perfcount_irq; else @@ -54,10 +54,10 @@ unsigned int get_c0_compare_int(void) { int mips_cpu_timer_irq; - if (cpu_has_veic) - panic("Unimplemented!"); - else if (mips_gic_present()) + if (mips_gic_present()) mips_cpu_timer_irq = gic_get_c0_compare_int(); + else if (cpu_has_veic) + panic("Unimplemented!"); else mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq; |