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143 lines
3.8 KiB
Diff
143 lines
3.8 KiB
Diff
From 154a670a945c54300749d5ba008f30bbd6089017 Mon Sep 17 00:00:00 2001
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From: Roger Quadros <rogerq@ti.com>
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Date: Mon, 27 Jan 2014 16:41:18 +0200
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Subject: [PATCH] ata: ahci_platform: Manage SATA PHY
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Some platforms have a PHY hooked up to the
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SATA controller. The PHY needs to be initialized
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and powered up for SATA to work. We do that
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using the PHY framework.
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CC: Balaji T K <balajitk@ti.com>
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Signed-off-by: Roger Quadros <rogerq@ti.com>
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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/ahci_platform.c | 47 +++++++++++++++++++++++++++++++++++++++++++--
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2 files changed, 47 insertions(+), 2 deletions(-)
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diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
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index bf8100c..3ab7ac9 100644
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--- a/drivers/ata/ahci.h
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+++ b/drivers/ata/ahci.h
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@@ -37,6 +37,7 @@
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#include <linux/clk.h>
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#include <linux/libata.h>
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+#include <linux/phy/phy.h>
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#include <linux/regulator/consumer.h>
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/* Enclosure Management Control */
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@@ -325,6 +326,7 @@ struct ahci_host_priv {
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u32 em_msg_type; /* EM message type */
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struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
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struct regulator *target_pwr; /* Optional */
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+ struct phy *phy; /* If platform uses phy */
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void *plat_data; /* Other platform data */
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/*
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* Optional ahci_start_engine override, if not set this gets set to the
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diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
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index d7e55ba..99d38c1 100644
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--- a/drivers/ata/ahci_platform.c
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+++ b/drivers/ata/ahci_platform.c
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@@ -23,6 +23,7 @@
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#include <linux/platform_device.h>
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#include <linux/libata.h>
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#include <linux/ahci_platform.h>
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+#include <linux/phy/phy.h>
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#include "ahci.h"
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static void ahci_host_stop(struct ata_host *host);
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@@ -147,6 +148,7 @@ void ahci_platform_disable_clks(struct ahci_host_priv *hpriv)
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* the following order:
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* 1) Regulator
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* 2) Clocks (through ahci_platform_enable_clks)
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+ * 3) Phy
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*
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* If resource enabling fails at any point the previous enabled
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* resources are disabled in reverse order.
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@@ -171,8 +173,23 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
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if (rc)
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goto disable_regulator;
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+ if (hpriv->phy) {
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+ rc = phy_init(hpriv->phy);
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+ if (rc)
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+ goto disable_clks;
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+
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+ rc = phy_power_on(hpriv->phy);
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+ if (rc) {
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+ phy_exit(hpriv->phy);
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+ goto disable_clks;
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+ }
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+ }
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+
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return 0;
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+disable_clks:
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+ ahci_platform_disable_clks(hpriv);
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+
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disable_regulator:
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if (hpriv->target_pwr)
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regulator_disable(hpriv->target_pwr);
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@@ -186,14 +203,20 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
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*
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* This function disables all ahci_platform managed resources in
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* the following order:
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- * 1) Clocks (through ahci_platform_disable_clks)
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- * 2) Regulator
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+ * 1) Phy
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+ * 2) Clocks (through ahci_platform_disable_clks)
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+ * 3) Regulator
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*
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* LOCKING:
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* None.
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*/
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void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
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{
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+ if (hpriv->phy) {
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+ phy_power_off(hpriv->phy);
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+ phy_exit(hpriv->phy);
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+ }
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+
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ahci_platform_disable_clks(hpriv);
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if (hpriv->target_pwr)
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@@ -222,6 +245,7 @@ static void ahci_platform_put_resources(struct device *dev, void *res)
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* 2) regulator for controlling the targets power (optional)
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* 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
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* or for non devicetree enabled platforms a single clock
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+ * 4) phy (optional)
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*
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* LOCKING:
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* None.
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@@ -283,6 +307,25 @@ struct ahci_host_priv *ahci_platform_get_resources(
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hpriv->clks[i] = clk;
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}
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+ hpriv->phy = devm_phy_get(dev, "sata-phy");
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+ if (IS_ERR(hpriv->phy)) {
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+ rc = PTR_ERR(hpriv->phy);
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+ switch (rc) {
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+ case -ENODEV:
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+ case -ENOSYS:
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+ /* continue normally */
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+ hpriv->phy = NULL;
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+ break;
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+
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+ case -EPROBE_DEFER:
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+ goto err_out;
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+
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+ default:
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+ dev_err(dev, "couldn't get sata-phy\n");
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+ goto err_out;
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+ }
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+ }
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+
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devres_remove_group(dev, NULL);
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return hpriv;
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--
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1.8.5.5
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