46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
From 3eec76bc21d78e56ac8404b59f29dd9dbbd1528a 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] libahci: Add a pre ahci_start_engine hook
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Allwinner A10 and A20 ARM SoCs have an AHCI sata controller which need a
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special register to be poked before starting the DMA engine.
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This register gets reset on an ahci_stop_engine call, so there is no other
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place then ahci_start_engine where this poking can be done.
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This commit adds a pre ahci_start_engine hook for use by the Allwinner AHCI
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driver (and potentially other drivers in the future).
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/ata/ahci.h | 2 ++
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drivers/ata/libahci.c | 4 ++++
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2 files changed, 6 insertions(+)
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--- a/drivers/ata/ahci.h
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+++ b/drivers/ata/ahci.h
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@@ -323,6 +323,8 @@ struct ahci_host_priv {
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u32 em_msg_type; /* EM message type */
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struct clk *clk; /* Only for platforms supporting clk */
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void *plat_data; /* Other platform data */
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+ /* Optional pre ahci_start_engine hook */
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+ void (*pre_start_engine)(struct ata_port *ap);
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};
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extern int ahci_ignore_sss;
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--- a/drivers/ata/libahci.c
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+++ b/drivers/ata/libahci.c
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@@ -568,8 +568,12 @@ static int ahci_scr_write(struct ata_lin
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void ahci_start_engine(struct ata_port *ap)
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{
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void __iomem *port_mmio = ahci_port_base(ap);
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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u32 tmp;
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+ if (hpriv->pre_start_engine)
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+ hpriv->pre_start_engine(ap);
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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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