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| author | Atish Patra <atish.patra@wdc.com> | 2020-09-18 00:37:11 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-10-02 23:31:03 +0200 |
| commit | 6262f661ff5d7d6a2613b95d0b7820c60b46b0b5 (patch) | |
| tree | 2753d9f367b40e59ecdaa896337d0d13b681b77f /arch/riscv/include | |
| parent | RISC-V: Move DT mapping outof fixmap (diff) | |
| download | linux-6262f661ff5d7d6a2613b95d0b7820c60b46b0b5.tar.xz linux-6262f661ff5d7d6a2613b95d0b7820c60b46b0b5.zip | |
RISC-V: Add early ioremap support
UEFI uses early IO or memory mappings for runtime services before
normal ioremap() is usable. Add the necessary fixmap bindings and
pmd mappings for generic ioremap support to work.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/Kbuild | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/fixmap.h | 13 | ||||
| -rw-r--r-- | arch/riscv/include/asm/io.h | 1 |
3 files changed, 15 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild index 3d9410bb4de0..59dd7be55005 100644 --- a/arch/riscv/include/asm/Kbuild +++ b/arch/riscv/include/asm/Kbuild @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 +generic-y += early_ioremap.h generic-y += extable.h generic-y += flat.h generic-y += kvm_para.h diff --git a/arch/riscv/include/asm/fixmap.h b/arch/riscv/include/asm/fixmap.h index 11613f38228a..54cbf07fb4e9 100644 --- a/arch/riscv/include/asm/fixmap.h +++ b/arch/riscv/include/asm/fixmap.h @@ -27,6 +27,19 @@ enum fixed_addresses { FIX_TEXT_POKE1, FIX_TEXT_POKE0, FIX_EARLYCON_MEM_BASE, + + __end_of_permanent_fixed_addresses, + /* + * Temporary boot-time mappings, used by early_ioremap(), + * before ioremap() is functional. + */ +#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) +#define FIX_BTMAPS_SLOTS 7 +#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) + + FIX_BTMAP_END = __end_of_permanent_fixed_addresses, + FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, + __end_of_fixed_addresses }; diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h index 3835c3295dc5..c025a746a148 100644 --- a/arch/riscv/include/asm/io.h +++ b/arch/riscv/include/asm/io.h @@ -14,6 +14,7 @@ #include <linux/types.h> #include <linux/pgtable.h> #include <asm/mmiowb.h> +#include <asm/early_ioremap.h> /* * MMIO access functions are separated out to break dependency cycles |