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Subject[v1 PATCH 3/5] RISC-V: Define fixmap bindings for generic early ioremap support
Date
UEFI uses early IO or memory mappings for runtime services before
normal ioremap() is usable. This patch only adds minimum necessary
fixmap bindings and headers for generic ioremap support to work.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/Kbuild | 1 +
arch/riscv/include/asm/fixmap.h | 21 ++++++++++++++++++++-
arch/riscv/include/asm/io.h | 1 +
4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 27bfc7947e44..42c122170cfd 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -65,6 +65,7 @@ config RISCV
select ARCH_HAS_GCOV_PROFILE_ALL
select HAVE_COPY_THREAD_TLS
select HAVE_ARCH_KASAN if MMU && 64BIT
+ select GENERIC_EARLY_IOREMAP

config ARCH_MMAP_RND_BITS_MIN
default 18 if 64BIT
diff --git a/arch/riscv/include/asm/Kbuild b/arch/riscv/include/asm/Kbuild
index ec0ca8c6ab64..517394390106 100644
--- a/arch/riscv/include/asm/Kbuild
+++ b/arch/riscv/include/asm/Kbuild
@@ -4,6 +4,7 @@ generic-y += checksum.h
generic-y += compat.h
generic-y += device.h
generic-y += div64.h
+generic-y += early_ioremap.h
generic-y += extable.h
generic-y += flat.h
generic-y += dma.h
diff --git a/arch/riscv/include/asm/fixmap.h b/arch/riscv/include/asm/fixmap.h
index 42d2c42f3cc9..7a4beb7e29a3 100644
--- a/arch/riscv/include/asm/fixmap.h
+++ b/arch/riscv/include/asm/fixmap.h
@@ -25,9 +25,28 @@ enum fixed_addresses {
#define FIX_FDT_SIZE SZ_1M
FIX_FDT_END,
FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
+ FIX_EARLYCON_MEM_BASE,
+
FIX_PTE,
FIX_PMD,
- FIX_EARLYCON_MEM_BASE,
+ /*
+ * Make sure that it is 2MB aligned.
+ */
+#define NR_FIX_SZ_2M (SZ_2M / PAGE_SIZE)
+ FIX_THOLE = NR_FIX_SZ_2M - FIX_PMD - 1,
+
+ __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 0f477206a4ed..047f414b6948 100644
--- a/arch/riscv/include/asm/io.h
+++ b/arch/riscv/include/asm/io.h
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <asm/mmiowb.h>
#include <asm/pgtable.h>
+#include <asm/early_ioremap.h>

/*
* MMIO access functions are separated out to break dependency cycles
--
2.24.0
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