diff options
Diffstat (limited to 'target/linux/sunxi/patches-3.12/190-ahci-missing-dma-for-sunxi.patch')
| -rw-r--r-- | target/linux/sunxi/patches-3.12/190-ahci-missing-dma-for-sunxi.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.12/190-ahci-missing-dma-for-sunxi.patch b/target/linux/sunxi/patches-3.12/190-ahci-missing-dma-for-sunxi.patch new file mode 100644 index 0000000000..c7a529967b --- /dev/null +++ b/target/linux/sunxi/patches-3.12/190-ahci-missing-dma-for-sunxi.patch @@ -0,0 +1,60 @@ +From a4c21089299ba411d998b16423a76cbae111194e Mon Sep 17 00:00:00 2001 +From: Oliver Schinagl <oliver@schinagl.nl> +Date: Mon, 2 Dec 2013 16:13:32 +0100 +Subject: [PATCH] RFC: AHCI: libahci is missing DMA + +The Allwinner sunxi platforms have patched in the following to enable +DMA. This patch enables DMA controllers for the SUNXI Architecture. + +Signed-off-by: Olliver Schinagl <oliver@schinagl.nl> +--- + drivers/ata/ahci.h | 6 ++++++ + drivers/ata/libahci.c | 8 ++++++++ + 2 files changed, 14 insertions(+) + +diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h +index 2289efd..2bf2423 100644 +--- a/drivers/ata/ahci.h ++++ b/drivers/ata/ahci.h +@@ -138,6 +138,7 @@ enum { + PORT_SCR_NTF = 0x3c, /* SATA phy register: SNotification */ + PORT_FBS = 0x40, /* FIS-based Switching */ + PORT_DEVSLP = 0x44, /* device sleep */ ++ PORT_DMA = 0x70, /* direct memory access */ + + /* PORT_IRQ_{STAT,MASK} bits */ + PORT_IRQ_COLD_PRES = (1 << 31), /* cold presence detect */ +@@ -209,6 +210,11 @@ enum { + PORT_DEVSLP_DSP = (1 << 1), /* DevSlp present */ + PORT_DEVSLP_ADSE = (1 << 0), /* Aggressive DevSlp enable */ + ++ /* PORT_DMA bits */ ++ PORT_DMA_SETUP_OFFSET = 8, /* dma setup offset */ ++ PORT_DMA_SETUP_MASK = (0xff << PORT_DMA_SETUP_OFFSET),/* dma mask */ ++ PORT_DMA_SETUP_INIT = (0x44 << 0), ++ + /* hpriv->flags bits */ + + #define AHCI_HFLAGS(flags) .private_data = (void *)(flags) +diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c +index c482f8c..d697a74 100644 +--- a/drivers/ata/libahci.c ++++ b/drivers/ata/libahci.c +@@ -570,6 +570,14 @@ void ahci_start_engine(struct ata_port *ap) + void __iomem *port_mmio = ahci_port_base(ap); + u32 tmp; + ++#ifdef CONFIG_ARCH_SUNXI ++ /* Setup DMA before DMA start */ ++ tmp = readl(port_mmio + PORT_DMA); ++ tmp &= ~PORT_DMA_SETUP_MASK; ++ tmp |= PORT_DMA_SETUP_INIT << PORT_DMA_SETUP_OFFSET; ++ writel(tmp, port_mmio + PORT_DMA); ++#endif ++ + /* start DMA */ + tmp = readl(port_mmio + PORT_CMD); + tmp |= PORT_CMD_START; +-- +1.8.5.1 + |