From: Balaji T K <balaj...@ti.com>
Some platforms have a PHY hooked up to the
SATA controller. The PHY needs to be initialized
and powered up for SATA to work. We do that
using the PHY framework.
[Roger Q] Cleaned up.
CC: Tejun Heo <t...@kernel.org>
Signed-off-by: Balaji T K <balaj...@ti.com>
Signed-off-by: Roger Quadros <rog...@ti.com>
---
drivers/ata/ahci.h | 2 ++
drivers/ata/ahci_platform.c | 46 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 47 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 2289efd..f9bbada 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -37,6 +37,7 @@
#include <linux/clk.h>
#include <linux/libata.h>
+#include <linux/phy/phy.h>
/* Enclosure Management Control */
#define EM_CTRL_MSG_TYPE 0x000f0000
@@ -322,6 +323,7 @@ struct ahci_host_priv {
u32 em_buf_sz; /* EM buffer size in byte */
u32 em_msg_type; /* EM message type */
struct clk *clk; /* Only for platforms
supporting clk */
+ struct phy *phy; /* If platform uses phy */
void *plat_data; /* Other platform data */
};
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index d5ced13..b476642 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -142,6 +142,39 @@ static int ahci_probe(struct platform_device *pdev)
}
}
+ hpriv->phy = devm_phy_get(dev, "sata-phy");
+ if (IS_ERR(hpriv->phy)) {
+ rc = PTR_ERR(hpriv->phy);
+ switch (rc) {
+ case -ENODEV:
+ case -ENOSYS:
+ /* continue normally */
+ hpriv->phy = NULL;
+ break;
+
+ case -EPROBE_DEFER:
+ goto disable_unprepare_clk;
+ break;
+
+ default:
+ dev_err(dev, "couldn't get sata-phy\n");
+ goto disable_unprepare_clk;
+ break;
+ }
+ }
+
+ if (hpriv->phy) {
+ rc = phy_init(hpriv->phy);
+ if (rc)
+ goto disable_unprepare_clk;
+
+ rc = phy_power_on(hpriv->phy);
+ if (rc) {
+ phy_exit(hpriv->phy);
+ goto disable_unprepare_clk;
+ }
+ }
+
/*
* Some platforms might need to prepare for mmio region access,
* which could be done in the following init call. So, the mmio
@@ -151,7 +184,7 @@ static int ahci_probe(struct platform_device *pdev)
if (pdata && pdata->init) {
rc = pdata->init(dev, hpriv->mmio);
if (rc)
- goto disable_unprepare_clk;
+ goto disable_phy;
}
ahci_save_initial_config(dev, hpriv,
@@ -221,6 +254,12 @@ static int ahci_probe(struct platform_device *pdev)
pdata_exit:
if (pdata && pdata->exit)
pdata->exit(dev);
+disable_phy:
+ if (hpriv->phy) {
+ phy_power_off(hpriv->phy);
+ phy_exit(hpriv->phy);
+ }
+
disable_unprepare_clk:
if (!IS_ERR(hpriv->clk))
clk_disable_unprepare(hpriv->clk);
@@ -239,6 +278,11 @@ static void ahci_host_stop(struct ata_host *host)
if (pdata && pdata->exit)
pdata->exit(dev);
+ if (hpriv->phy) {
+ phy_power_off(hpriv->phy);
+ phy_exit(hpriv->phy);
+ }
+
if (!IS_ERR(hpriv->clk)) {
clk_disable_unprepare(hpriv->clk);
clk_put(hpriv->clk);
--
1.8.3.2
--
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