Add support for GENERIC_EARLY_IOREMAP.
Let's define 16 slots of 256Kbytes each for early ioremap.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/Kbuild | 1 +
arch/powerpc/include/asm/fixmap.h | 12 ++++++++++++
arch/powerpc/kernel/setup_32.c | 3 +++
arch/powerpc/kernel/setup_64.c | 3 +++
5 files changed, 20 insertions(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 6a7c797fa9d2..8fe252962518 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -161,6 +161,7 @@ config PPC
select GENERIC_CMOS_UPDATE
select GENERIC_CPU_AUTOPROBE
select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
+ select GENERIC_EARLY_IOREMAP
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
select GENERIC_PCI_IOMAP if PCI
diff --git a/arch/powerpc/include/asm/Kbuild b/arch/powerpc/include/asm/Kbuild
index 9a1d2fc6ceb7..30829120659c 100644
--- a/arch/powerpc/include/asm/Kbuild
+++ b/arch/powerpc/include/asm/Kbuild
@@ -12,3 +12,4 @@ generic-y += preempt.h
generic-y += vtime.h
generic-y += msi.h
generic-y += simd.h
+generic-y += early_ioremap.h
diff --git a/arch/powerpc/include/asm/fixmap.h
b/arch/powerpc/include/asm/fixmap.h
index 722289a1d000..d5c4d357bd33 100644
--- a/arch/powerpc/include/asm/fixmap.h
+++ b/arch/powerpc/include/asm/fixmap.h
@@ -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
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index a7541edf0cdb..dcffe927f5b9 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -44,6 +44,7 @@
#include <asm/asm-prototypes.h>
#include <asm/kdump.h>
#include <asm/feature-fixups.h>
+#include <asm/early_ioremap.h>
#include "setup.h"
@@ -80,6 +81,8 @@ notrace void __init machine_init(u64 dt_ptr)
/* Configure static keys first, now that we're relocated. */
setup_feature_keys();
+ early_ioremap_setup();
+
/* Enable early debugging if any specified (see udbg.h) */
udbg_early_init();
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 44b4c432a273..b85f6a1cc3a1 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -65,6 +65,7 @@
#include <asm/hw_irq.h>
#include <asm/feature-fixups.h>
#include <asm/kup.h>
+#include <asm/early_ioremap.h>
#include "setup.h"
@@ -338,6 +339,8 @@ void __init early_setup(unsigned long dt_ptr)
apply_feature_fixups();
setup_feature_keys();
+ early_ioremap_setup();
+
/* Initialize the hash table or TLB handling */
early_init_mmu();
