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From: Oleksij Rempel <linux@rempel-privat.de>
To: barebox@lists.infradead.org
Cc: Peter Mamonov <pmamonov@gmail.com>
Subject: [PATCH v2 04/13] MIPS: add virt_to_phys() and phys_to_virt()
Date: Mon,  7 Aug 2017 16:39:18 +0200	[thread overview]
Message-ID: <20170807143927.1641-4-linux@rempel-privat.de> (raw)
In-Reply-To: <20170807143927.1641-1-linux@rempel-privat.de>

From: Antony Pavlov <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 4bee5913a..993b30e2a 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
 
 /*****************************************************************************/
-- 
2.11.0


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  parent reply	other threads:[~2017-08-07 14:40 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-07 14:39 [PATCH v2 01/13] MIPS: ath79: provide CONFIG_SOC_QCA_AR9331 option Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 02/13] MIPS: ath79: add initial QCA AR9344 SoC support Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 03/13] MIPS: ath79: add TP-Link WDR4300 board support Oleksij Rempel
2017-08-07 14:39 ` Oleksij Rempel [this message]
2017-08-07 19:56   ` [PATCH v2 04/13] MIPS: add virt_to_phys() and phys_to_virt() Peter Mamonov
2017-08-07 14:39 ` [PATCH v2 05/13] net: ath79: add ag71xx Ethernet driver Oleksij Rempel
2017-08-07 20:45   ` Peter Mamonov
2017-08-08  7:50     ` Lucas Stach
2017-08-07 14:39 ` [PATCH v2 06/13] net: ag71xx: bit 19 should be set to 1 for GE0 Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 07/13] MIPS: tplink-mr3020: pbl: move WMAC init after flash addr test Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 08/13] MIPS: tplink-mr3020: pbl: move hornet_mips24k_cp0_setup " Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 09/13] MIPS: tplink-mr3020_defconfig: enable more options Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 10/13] MIPS: tplink-mr3020.dts: add partition table Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 11/13] MIPS: ar9344.dtsi: add ag71xx Ethernet driver Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 12/13] MIPS: ath79: add barebox update handler Oleksij Rempel
2017-08-07 14:39 ` [PATCH v2 13/13] filetype: fix file type detection for Barebox MIPS Oleksij Rempel
2017-08-09 15:23 ` [PATCH v2 01/13] MIPS: ath79: provide CONFIG_SOC_QCA_AR9331 option Oleksij Rempel

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