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