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powerpc: Add support for GENERIC_EARLY_IOREMAP

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Add support for GENERIC_EARLY_IOREMAP.

Let's define 16 slots of 256Kbytes each for early ioremap.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/412c7eaa6a373d8f82a3c3ee01e6a65a1a6589de.1568295907.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy
2019-09-12 13:49:43 +00:00
committed by Michael Ellerman
parent 77693a5fb5
commit 265c3491c4
5 changed files with 20 additions and 0 deletions
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12
arch/powerpc/include/asm/fixmap.h
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@@ -15,6 +15,7 @@
#define _ASM_FIXMAP_H
#ifndef __ASSEMBLY__
#include <linux/sizes.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#ifdef CONFIG_HIGHMEM
@@ -64,6 +65,14 @@ enum fixed_addresses {
FIX_IMMR_SIZE,
#endif
/* FIX_PCIE_MCFG, */
__end_of_permanent_fixed_addresses,
#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
#define FIX_BTMAPS_SLOTS 16
#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
};
@@ -71,6 +80,7 @@ enum fixed_addresses {
#define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE)
#define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_NCG
#define FIXMAP_PAGE_IO PAGE_KERNEL_NCG
#include <asm-generic/fixmap.h>
@@ -85,5 +95,7 @@ static inline void __set_fixmap(enum fixed_addresses idx,
map_kernel_page(__fix_to_virt(idx), phys, flags);
}
#define __early_set_fixmap __set_fixmap
#endif /* !__ASSEMBLY__ */
#endif