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riscv: don't allow selecting SBI based drivers for M-mode 

When running in M-mode we can't use SBI based drivers.  Add a new
CONFIG_RISCV_SBI that drivers that do SBI calls can depend on
instead.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Damien Le Moal 2019-10-28 13:10:33 +01:00 committed by Paul Walmsley
parent a4c3733d32
commit eded8bc66a
3 changed files with 8 additions and 2 deletions
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6
arch/riscv/Kconfig
View File

@ -76,6 +76,12 @@ config ARCH_MMAP_RND_BITS_MAX
config RISCV_M_MODE config RISCV_M_MODE
bool bool
# set if we are running in S-mode and can use SBI calls
config RISCV_SBI
bool
depends on !RISCV_M_MODE
default y
config MMU config MMU
def_bool y def_bool y

2
drivers/tty/hvc/Kconfig
View File

@ -89,7 +89,7 @@ config HVC_DCC
config HVC_RISCV_SBI config HVC_RISCV_SBI
bool "RISC-V SBI console support" bool "RISC-V SBI console support"
depends on RISCV depends on RISCV_SBI
select HVC_DRIVER select HVC_DRIVER
help help
This enables support for console output via RISC-V SBI calls, which This enables support for console output via RISC-V SBI calls, which

2
drivers/tty/serial/Kconfig
View File

@ -88,7 +88,7 @@ config SERIAL_EARLYCON_ARM_SEMIHOST
config SERIAL_EARLYCON_RISCV_SBI config SERIAL_EARLYCON_RISCV_SBI
bool "Early console using RISC-V SBI" bool "Early console using RISC-V SBI"
depends on RISCV depends on RISCV_SBI
select SERIAL_CORE select SERIAL_CORE
select SERIAL_CORE_CONSOLE select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON select SERIAL_EARLYCON