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authorMax Filippov <jcmvbkbc@gmail.com>2020-02-01 06:33:28 +0100
committerMax Filippov <jcmvbkbc@gmail.com>2023-08-29 03:25:23 +0200
commit03ce34cf8f50e4c62f9a4b62caffdba1165ca977 (patch)
treeae0a4ae9bce6a357a4332051d79625ac3db41a62
parentxtensa: PMU: fix base address for the newer hardware (diff)
downloadlinux-03ce34cf8f50e4c62f9a4b62caffdba1165ca977.tar.xz
linux-03ce34cf8f50e4c62f9a4b62caffdba1165ca977.zip
xtensa: add XIP-aware MTD support
Add Kconfig symbol, asm/mtd-xip.h header and define related macros: xip_cpu_idle, xip_irqpending, xip_currtime and xip_elapsed_since. Append .xiptext to the vectors when separate vectors are configured because otherwise they are appended to the data and data may not even be executable in XIP configuration. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
-rw-r--r--arch/xtensa/Kconfig3
-rw-r--r--arch/xtensa/include/asm/mtd-xip.h14
-rw-r--r--arch/xtensa/include/asm/sections.h4
-rw-r--r--arch/xtensa/kernel/setup.c3
-rw-r--r--arch/xtensa/kernel/vmlinux.lds.S11
5 files changed, 34 insertions, 1 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 2a51a466779f..070a112b7dbe 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -70,6 +70,9 @@ config ARCH_HAS_ILOG2_U32
config ARCH_HAS_ILOG2_U64
def_bool n
+config ARCH_MTD_XIP
+ def_bool y
+
config NO_IOPORT_MAP
def_bool n
diff --git a/arch/xtensa/include/asm/mtd-xip.h b/arch/xtensa/include/asm/mtd-xip.h
new file mode 100644
index 000000000000..514325155cf8
--- /dev/null
+++ b/arch/xtensa/include/asm/mtd-xip.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _ASM_MTD_XIP_H
+#define _ASM_MTD_XIP_H
+
+#include <asm/processor.h>
+
+#define xip_irqpending() (xtensa_get_sr(interrupt) & xtensa_get_sr(intenable))
+#define xip_currtime() (xtensa_get_sr(ccount))
+#define xip_elapsed_since(x) ((xtensa_get_sr(ccount) - (x)) / 1000) /* should work up to 1GHz */
+#define xip_cpu_idle() do { asm volatile ("waiti 0"); } while (0)
+
+#endif /* _ASM_MTD_XIP_H */
+
diff --git a/arch/xtensa/include/asm/sections.h b/arch/xtensa/include/asm/sections.h
index 3bc6b9afa993..e5da6d7092be 100644
--- a/arch/xtensa/include/asm/sections.h
+++ b/arch/xtensa/include/asm/sections.h
@@ -34,6 +34,10 @@ extern char _SecondaryResetVector_text_start[];
extern char _SecondaryResetVector_text_end[];
#endif
#ifdef CONFIG_XIP_KERNEL
+#ifdef CONFIG_VECTORS_ADDR
+extern char _xip_text_start[];
+extern char _xip_text_end[];
+#endif
extern char _xip_start[];
extern char _xip_end[];
#endif
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index aba3ff4e60d8..52d6e4870a04 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -311,6 +311,9 @@ void __init setup_arch(char **cmdline_p)
mem_reserve(__pa(_stext), __pa(_end));
#ifdef CONFIG_XIP_KERNEL
+#ifdef CONFIG_VECTORS_ADDR
+ mem_reserve(__pa(_xip_text_start), __pa(_xip_text_end));
+#endif
mem_reserve(__pa(_xip_start), __pa(_xip_end));
#endif
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index c14fd96f459d..f47e9bbbd291 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -118,6 +118,7 @@ SECTIONS
SECTION_VECTOR2 (.DoubleExceptionVector.text, DOUBLEEXC_VECTOR_VADDR)
*(.exception.text)
+ *(.xiptext)
#endif
IRQENTRY_TEXT
@@ -201,6 +202,9 @@ SECTIONS
.DebugInterruptVector.text);
RELOCATE_ENTRY(_exception_text,
.exception.text);
+#ifdef CONFIG_XIP_KERNEL
+ RELOCATE_ENTRY(_xip_text, .xiptext);
+#endif
#endif
#ifdef CONFIG_XIP_KERNEL
RELOCATE_ENTRY(_xip_data, .data);
@@ -319,7 +323,12 @@ SECTIONS
LAST)
#undef LAST
#define LAST .exception.text
-
+ SECTION_VECTOR4 (_xip_text,
+ .xiptext,
+ ,
+ LAST)
+#undef LAST
+#define LAST .xiptext
#endif
. = (LOADADDR(LAST) + SIZEOF(LAST) + 3) & ~ 3;