Christophe Leroy <christophe.le...@c-s.fr> writes:
> 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();
>
Can we remove early_ioremap_range() after this?
-aneesh
