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From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Cc: Peter Mamonov <pmamonov@gmail.com>
Subject: [RFC v2 1/8] MIPS: add virt_to_phys() and phys_to_virt()
Date: Mon,  5 Dec 2016 12:40:26 +0300	[thread overview]
Message-ID: <20161205094033.31569-2-antonynpavlov@gmail.com> (raw)
In-Reply-To: <20161205094033.31569-1-antonynpavlov@gmail.com>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
---
 arch/mips/include/asm/io.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 4bee591..993b30e 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -12,11 +12,46 @@
 
 #include <linux/compiler.h>
 #include <asm/types.h>
+#include <asm/addrspace.h>
 #include <asm/byteorder.h>
 
 void dma_flush_range(unsigned long, unsigned long);
 void dma_inv_range(unsigned long, unsigned long);
 
+/*
+ *     virt_to_phys    -       map virtual addresses to physical
+ *     @address: address to remap
+ *
+ *     The returned physical address is the physical (CPU) mapping for
+ *     the memory address given. It is only valid to use this function on
+ *     addresses directly mapped or allocated via kmalloc.
+ *
+ *     This function does not give bus mappings for DMA transfers. In
+ *     almost all conceivable cases a device driver should not be using
+ *     this function
+ */
+static inline unsigned long virt_to_phys(const void *address)
+{
+	return (unsigned long)address & 0x1fffffff;
+}
+
+/*
+ *     phys_to_virt    -       map physical address to virtual
+ *     @address: address to remap
+ *
+ *     The returned virtual address is a current CPU mapping for
+ *     the memory address given. It is only valid to use this function on
+ *     addresses that have a kernel mapping
+ *
+ *     This function does not handle bus mappings for DMA transfers. In
+ *     almost all conceivable cases a device driver should not be using
+ *     this function
+ */
+static inline void *phys_to_virt(unsigned long address)
+{
+	return (void *)(KSEG0 | (address & 0x1fffffff));
+}
+
 #define	IO_SPACE_LIMIT	0
 
 /*****************************************************************************/
-- 
2.10.2


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  reply	other threads:[~2016-12-05  9:41 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-05  9:40 [RFC v2 0/8] MIPS: use kexec to load ELF linux images Antony Pavlov
2016-12-05  9:40 ` Antony Pavlov [this message]
2016-12-05  9:40 ` [RFC v2 2/8] MIPS: c-r4k: add support for secondary cache Antony Pavlov
2016-12-05  9:40 ` [RFC v2 3/8] resource: add create_resource() helper function Antony Pavlov
2016-12-05  9:40 ` [RFC v2 4/8] import initial kexec stuff Antony Pavlov
2016-12-07 19:47   ` Sascha Hauer
2016-12-08  7:24     ` Antony Pavlov
2016-12-05  9:40 ` [RFC v2 5/8] filetype: add ELF type Antony Pavlov
2016-12-05  9:40 ` [RFC v2 6/8] bootm: add kexec ELF support Antony Pavlov
2016-12-07 19:59   ` Sascha Hauer
2016-12-08  7:29     ` Antony Pavlov
2016-12-05  9:40 ` [RFC v2 7/8] MIPS: add kexec ELF loading support Antony Pavlov
2016-12-05  9:40 ` [RFC v2 8/8] MIPS: malta: enable kexec Antony Pavlov

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