[PATCH v2 5/5] arm64: add early_ioremap support
Add support for early IO or memory mappings which are needed
before the normal ioremap() is usable. This also adds fixmap
support for permanent fixed mappings such as that used by the
earlyprintk device register region.
Signed-off-by: Mark Salter
CC: linux-arm-ker...@lists.infradead.org
CC: Catalin Marinas
CC: Will Deacon
---
Documentation/arm64/memory.txt | 4 +-
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/Kbuild| 1 +
arch/arm64/include/asm/fixmap.h | 68
arch/arm64/include/asm/io.h | 1 +
arch/arm64/include/asm/memory.h | 2 +-
arch/arm64/kernel/early_printk.c | 8 +++-
arch/arm64/kernel/head.S | 9 ++---
arch/arm64/kernel/setup.c| 2 +
arch/arm64/mm/ioremap.c | 85
arch/arm64/mm/mmu.c | 41 ---
11 files changed, 170 insertions(+), 52 deletions(-)
create mode 100644 arch/arm64/include/asm/fixmap.h
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
index 5e054bf..953c81e 100644
--- a/Documentation/arm64/memory.txt
+++ b/Documentation/arm64/memory.txt
@@ -35,7 +35,7 @@ ffbc ffbd 8GB
vmemmap
ffbe ffbffbbf ~8GB [guard, future
vmmemap]
-ffbffbc0 ffbffbdf 2MB earlyprintk
device
+ffbffbc0 ffbffbdf 2MB fixed mappings
ffbffbe0 ffbffbe0 64KB PCI I/O space
@@ -60,7 +60,7 @@ fdfc fdfd 8GB
vmemmap
fdfe fdfffbbf ~8GB [guard, future
vmmemap]
-fdfffbc0 fdfffbdf 2MB earlyprintk
device
+fdfffbc0 fdfffbdf 2MB fixed mappings
fdfffbe0 fdfffbe0 64KB PCI I/O space
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6d4dd22..e66a317 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -12,6 +12,7 @@ config ARM64
select CLONE_BACKWARDS
select COMMON_CLK
select GENERIC_CLOCKEVENTS
+ select GENERIC_EARLY_IOREMAP
select GENERIC_IOMAP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 519f89f..b7f99a3 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -10,6 +10,7 @@ generic-y += delay.h
generic-y += div64.h
generic-y += dma.h
generic-y += emergency-restart.h
+generic-y += early_ioremap.h
generic-y += errno.h
generic-y += ftrace.h
generic-y += hw_irq.h
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
new file mode 100644
index 000..7ad4f29
--- /dev/null
+++ b/arch/arm64/include/asm/fixmap.h
@@ -0,0 +1,68 @@
+/*
+ * fixmap.h: compile-time virtual memory allocation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1998 Ingo Molnar
+ * Copyright (C) 2013 Mark Salter
+ *
+ * Adapted from arch/x86_64 version.
+ *
+ */
+
+#ifndef _ASM_ARM64_FIXMAP_H
+#define _ASM_ARM64_FIXMAP_H
+
+#ifndef __ASSEMBLY__
+#include
+#include
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process.
+ *
+ * These 'compile-time allocated' memory buffers are
+ * page-sized. Use set_fixmap(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ */
+enum fixed_addresses {
+ FIX_EARLYCON,
+ __end_of_permanent_fixed_addresses,
+
+ /*
+* Temporary boot-time mappings, used by early_ioremap(),
+* before ioremap() is functional.
+*/
+#ifdef CONFIG_ARM64_64K_PAGES
+#define NR_FIX_BTMAPS 4
+#else
+#define NR_FIX_BTMAPS 64
+#endif
+#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
+};
+
+#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
+
+#define FIXMAP_PAGE_NORMAL PAGE_KERNEL_EXEC
+#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
+
+extern void __early_set_fixmap(enum fixed_addresses idx,
+ phys_addr_t phys, pgprot_t flags);
+
+#define __set_fixmap __early_set_fixmap
+
+#include
+
+#endif /* !__ASSEMBLY__ */
+#endif /* _ASM_ARM64_FIXMAP_H */
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index
[PATCH v2 5/5] arm64: add early_ioremap support
Add support for early IO or memory mappings which are needed
before the normal ioremap() is usable. This also adds fixmap
support for permanent fixed mappings such as that used by the
earlyprintk device register region.
Signed-off-by: Mark Salter msal...@redhat.com
CC: linux-arm-ker...@lists.infradead.org
CC: Catalin Marinas catalin.mari...@arm.com
CC: Will Deacon will.dea...@arm.com
---
Documentation/arm64/memory.txt | 4 +-
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/Kbuild| 1 +
arch/arm64/include/asm/fixmap.h | 68
arch/arm64/include/asm/io.h | 1 +
arch/arm64/include/asm/memory.h | 2 +-
arch/arm64/kernel/early_printk.c | 8 +++-
arch/arm64/kernel/head.S | 9 ++---
arch/arm64/kernel/setup.c| 2 +
arch/arm64/mm/ioremap.c | 85
arch/arm64/mm/mmu.c | 41 ---
11 files changed, 170 insertions(+), 52 deletions(-)
create mode 100644 arch/arm64/include/asm/fixmap.h
diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt
index 5e054bf..953c81e 100644
--- a/Documentation/arm64/memory.txt
+++ b/Documentation/arm64/memory.txt
@@ -35,7 +35,7 @@ ffbc ffbd 8GB
vmemmap
ffbe ffbffbbf ~8GB [guard, future
vmmemap]
-ffbffbc0 ffbffbdf 2MB earlyprintk
device
+ffbffbc0 ffbffbdf 2MB fixed mappings
ffbffbe0 ffbffbe0 64KB PCI I/O space
@@ -60,7 +60,7 @@ fdfc fdfd 8GB
vmemmap
fdfe fdfffbbf ~8GB [guard, future
vmmemap]
-fdfffbc0 fdfffbdf 2MB earlyprintk
device
+fdfffbc0 fdfffbdf 2MB fixed mappings
fdfffbe0 fdfffbe0 64KB PCI I/O space
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6d4dd22..e66a317 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -12,6 +12,7 @@ config ARM64
select CLONE_BACKWARDS
select COMMON_CLK
select GENERIC_CLOCKEVENTS
+ select GENERIC_EARLY_IOREMAP
select GENERIC_IOMAP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 519f89f..b7f99a3 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -10,6 +10,7 @@ generic-y += delay.h
generic-y += div64.h
generic-y += dma.h
generic-y += emergency-restart.h
+generic-y += early_ioremap.h
generic-y += errno.h
generic-y += ftrace.h
generic-y += hw_irq.h
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
new file mode 100644
index 000..7ad4f29
--- /dev/null
+++ b/arch/arm64/include/asm/fixmap.h
@@ -0,0 +1,68 @@
+/*
+ * fixmap.h: compile-time virtual memory allocation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1998 Ingo Molnar
+ * Copyright (C) 2013 Mark Salter msal...@redhat.com
+ *
+ * Adapted from arch/x86_64 version.
+ *
+ */
+
+#ifndef _ASM_ARM64_FIXMAP_H
+#define _ASM_ARM64_FIXMAP_H
+
+#ifndef __ASSEMBLY__
+#include linux/kernel.h
+#include asm/page.h
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process.
+ *
+ * These 'compile-time allocated' memory buffers are
+ * page-sized. Use set_fixmap(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ */
+enum fixed_addresses {
+ FIX_EARLYCON,
+ __end_of_permanent_fixed_addresses,
+
+ /*
+* Temporary boot-time mappings, used by early_ioremap(),
+* before ioremap() is functional.
+*/
+#ifdef CONFIG_ARM64_64K_PAGES
+#define NR_FIX_BTMAPS 4
+#else
+#define NR_FIX_BTMAPS 64
+#endif
+#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
+};
+
+#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses PAGE_SHIFT)
+#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
+
+#define FIXMAP_PAGE_NORMAL PAGE_KERNEL_EXEC
+#define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE)
+
+extern void __early_set_fixmap(enum fixed_addresses idx,
+ phys_addr_t phys, pgprot_t flags);
+
+#define __set_fixmap __early_set_fixmap
+
+#include asm-generic/fixmap.h
+
+#endif /* !__ASSEMBLY__ */
+#endif
