openwrtv3/target/linux/sunxi/patches-3.12/190-ahci-missing-dma-for-sunxi.patch
Zoltan Herpai 34ca9f355e sunxi: add sata driver for sun[47]i
Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

SVN-Revision: 39197
2014-01-04 16:30:56 +00:00

60 lines
1.9 KiB
Diff

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