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authorStefan Roese <sr@denx.de>2016-09-15 08:37:31 +0300
committerVinod Koul <vinod.koul@intel.com>2016-09-15 18:43:59 +0300
commit77ff7a706f014a56d38f07acf220f381a8fe0fd8 (patch)
tree060c52eedaba57d63912fc10e89bdefbfcb8ded1 /drivers/dma/mv_xor.h
parent434cec62a6d73b8c8080cd992bc97a564fdd5a5a (diff)
downloadlinux-77ff7a706f014a56d38f07acf220f381a8fe0fd8.tar.xz
dmaengine: mv_xor: Add support for IO (PCIe) src/dst areas
To enable the access to a specific area, the MVEBU XOR controllers needs to have this area enabled / mapped via an address window. Right now, only the DRAM memory area is enabled via such memory windows. So using this driver to DMA to / from a e.g. PCIe memory region is currently not supported. This patch now adds support for such PCIe / IO regions by checking if the src / dst address is located in an IO memory area in contrast to being located in DRAM. This is done by using the newly introduced MBus function mvebu_mbus_get_io_win_info(). If the src / dst address is located in such an IO area, a new address window is created in the XOR DMA controller. Enabling the controller to access this area. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Gregory CLEMENT <gregory.clement@free-electrons.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Marcin Wojtas <mw@semihalf.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/mv_xor.h')
-rw-r--r--drivers/dma/mv_xor.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index bf56e082e7cd..88eeab222a23 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -80,12 +80,17 @@
#define WINDOW_BAR_ENABLE(chan) (0x40 + ((chan) << 2))
#define WINDOW_OVERRIDE_CTRL(chan) (0xA0 + ((chan) << 2))
+#define WINDOW_COUNT 8
+
struct mv_xor_device {
void __iomem *xor_base;
void __iomem *xor_high_base;
struct clk *clk;
struct mv_xor_chan *channels[MV_XOR_MAX_CHANNELS];
int xor_type;
+
+ u32 win_start[WINDOW_COUNT];
+ u32 win_end[WINDOW_COUNT];
};
/**
@@ -127,6 +132,8 @@ struct mv_xor_chan {
char dummy_dst[MV_XOR_MIN_BYTE_COUNT];
dma_addr_t dummy_src_addr, dummy_dst_addr;
u32 saved_config_reg, saved_int_mask_reg;
+
+ struct mv_xor_device *xordev;
};
/**