mail archive of the barebox mailing list
 help / color / mirror / Atom feed
* [PATCH v2] MIPS: add virt_to_phys() and phys_to_virt()
@ 2017-08-11 13:55 Oleksij Rempel
  2017-08-11 13:59 ` Lucas Stach
  0 siblings, 1 reply; 2+ messages in thread
From: Oleksij Rempel @ 2017-08-11 13:55 UTC (permalink / raw)
  To: barebox; +Cc: Peter Mamonov, Oleksij Rempel

From: Antony Pavlov <antonynpavlov@gmail.com>

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
---
changes.
v2:
 - make use of use CPHYSADDR and CKSEG0ADDR

 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 4bee5913a..d4eb623c3 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)CPHYSADDR(address);
+}
+
+/*
+ *     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 *)CKSEG0ADDR(address);
+}
+
 #define	IO_SPACE_LIMIT	0
 
 /*****************************************************************************/
-- 
2.11.0


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v2] MIPS: add virt_to_phys() and phys_to_virt()
  2017-08-11 13:55 [PATCH v2] MIPS: add virt_to_phys() and phys_to_virt() Oleksij Rempel
@ 2017-08-11 13:59 ` Lucas Stach
  0 siblings, 0 replies; 2+ messages in thread
From: Lucas Stach @ 2017-08-11 13:59 UTC (permalink / raw)
  To: Oleksij Rempel; +Cc: barebox, Peter Mamonov

Am Freitag, den 11.08.2017, 15:55 +0200 schrieb Oleksij Rempel:
> From: Antony Pavlov <antonynpavlov@gmail.com>
> 
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
> Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
> ---
> changes.
> v2:
>  - make use of use CPHYSADDR and CKSEG0ADDR
> 
>  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 4bee5913a..d4eb623c3 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.

The last sentence in this...

> + *     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)CPHYSADDR(address);
> +}
> +
> +/*
> + *     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

... and this paragraph have no meaning Barebox at all.

> + *     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 *)CKSEG0ADDR(address);
> +}
> +
>  #define	IO_SPACE_LIMIT	0
>  
>  /*****************************************************************************/



_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2017-08-11 13:59 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-08-11 13:55 [PATCH v2] MIPS: add virt_to_phys() and phys_to_virt() Oleksij Rempel
2017-08-11 13:59 ` Lucas Stach

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox