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| author |   Timur Tabi <timur@freescale.com> | 2011-07-08 19:06:12 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-23 10:32:56 -0700 |
| commit | dcd83aaff1c8cbd5b48c152b559e0af3ea1a7b65 (patch) | |
| tree | 536ce3416fd908f0506899b371d86fb21171078c /arch | |
| parent | Linux 3.1-rc3 (diff) | |
| download | linux-dev-dcd83aaff1c8cbd5b48c152b559e0af3ea1a7b65.tar.xz linux-dev-dcd83aaff1c8cbd5b48c152b559e0af3ea1a7b65.zip | |
tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver
The ePAPR embedded hypervisor specification provides an API for "byte
channels", which are serial-like virtual devices for sending and receiving
streams of bytes. This driver provides Linux kernel support for byte
channels via three distinct interfaces:
1) An early-console (udbg) driver. This provides early console output
through a byte channel. The byte channel handle must be specified in a
Kconfig option.
2) A normal console driver. Output is sent to the byte channel designated
for stdout in the device tree. The console driver is for handling kernel
printk calls.
3) A tty driver, which is used to handle user-space input and output. The
byte channel used for the console is designated as the default tty.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/udbg.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/udbg.c | 2 |
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/udbg.h b/arch/powerpc/include/asm/udbg.h index 93e05d1b34b2..5354ae91bdde 100644 --- a/arch/powerpc/include/asm/udbg.h +++ b/arch/powerpc/include/asm/udbg.h @@ -54,6 +54,7 @@ extern void __init udbg_init_40x_realmode(void); extern void __init udbg_init_cpm(void); extern void __init udbg_init_usbgecko(void); extern void __init udbg_init_wsp(void); +extern void __init udbg_init_ehv_bc(void); #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_UDBG_H */ diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c index faa82c1f3f68..b4607a91d1f4 100644 --- a/arch/powerpc/kernel/udbg.c +++ b/arch/powerpc/kernel/udbg.c @@ -67,6 +67,8 @@ void __init udbg_early_init(void) udbg_init_usbgecko(); #elif defined(CONFIG_PPC_EARLY_DEBUG_WSP) udbg_init_wsp(); +#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC) + udbg_init_ehv_bc(); #endif #ifdef CONFIG_PPC_EARLY_DEBUG |