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| author | Bin Meng <bmeng.cn@gmail.com> | 2015-06-23 12:18:49 +0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-07-14 18:03:17 -0600 |
| commit | 3d232878289bf59e83c6b152407a01f6e0fb790b (patch) | |
| tree | 55413b7266202a293c1df5d571e22700b2370485 /arch | |
| parent | ba9091f55d68fc3d7b65a710f9d47c0be15e816d (diff) | |
| download | blackbird-obmc-uboot-3d232878289bf59e83c6b152407a01f6e0fb790b.tar.gz blackbird-obmc-uboot-3d232878289bf59e83c6b152407a01f6e0fb790b.zip | |
x86: Add I/O APIC register access routines
I/O APIC registers are addressed indirectly. Add io_apic_read() and
io_apic_write() routines to help register access. Two macros for I/O
APIC ID and version register offset are also added.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/cpu/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/cpu/ioapic.c | 21 | ||||
| -rw-r--r-- | arch/x86/include/asm/ioapic.h | 24 |
3 files changed, 46 insertions, 1 deletions
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile index 48197fb0fa..8a8e63e1d3 100644 --- a/arch/x86/cpu/Makefile +++ b/arch/x86/cpu/Makefile @@ -19,7 +19,7 @@ obj-$(CONFIG_NORTHBRIDGE_INTEL_SANDYBRIDGE) += ivybridge/ obj-$(CONFIG_NORTHBRIDGE_INTEL_IVYBRIDGE) += ivybridge/ obj-$(CONFIG_INTEL_QUARK) += quark/ obj-$(CONFIG_INTEL_QUEENSBAY) += queensbay/ -obj-y += irq.o lapic.o +obj-y += irq.o lapic.o ioapic.o obj-$(CONFIG_SMP) += mp_init.o obj-y += mtrr.o obj-$(CONFIG_PCI) += pci.o diff --git a/arch/x86/cpu/ioapic.c b/arch/x86/cpu/ioapic.c new file mode 100644 index 0000000000..112a9c63b4 --- /dev/null +++ b/arch/x86/cpu/ioapic.c @@ -0,0 +1,21 @@ +/* + * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/ioapic.h> + +u32 io_apic_read(u32 reg) +{ + writel(reg, IO_APIC_INDEX); + return readl(IO_APIC_DATA); +} + +void io_apic_write(u32 reg, u32 val) +{ + writel(reg, IO_APIC_INDEX); + writel(val, IO_APIC_DATA); +} diff --git a/arch/x86/include/asm/ioapic.h b/arch/x86/include/asm/ioapic.h index f5d69dbf97..77c443e9f5 100644 --- a/arch/x86/include/asm/ioapic.h +++ b/arch/x86/include/asm/ioapic.h @@ -15,4 +15,28 @@ #define IO_APIC_INDEX (IO_APIC_ADDR + 0x00) #define IO_APIC_DATA (IO_APIC_ADDR + 0x10) +/* Indirect addressed register offset */ +#define IO_APIC_ID 0x00 +#define IO_APIC_VER 0x01 + +/** + * io_apic_read() - Read I/O APIC register + * + * This routine reads I/O APIC indirect addressed register. + * + * @reg: address of indirect addressed register + * @return: register value to read + */ +u32 io_apic_read(u32 reg); + +/** + * io_apic_write() - Write I/O APIC register + * + * This routine writes I/O APIC indirect addressed register. + * + * @reg: address of indirect addressed register + * @val: register value to write + */ +void io_apic_write(u32 reg, u32 val); + #endif |
