target/linux/ipq806x/patches/0117-ata-ahci_platform-Manage-SATA-PHY.patch

   1 From 05b9b8d1035944af25694d2ebe53077cf1ccb067 Mon Sep 17 00:00:00 2001
   2 From: Roger Quadros <rogerq@ti.com>
   3 Date: Sat, 22 Feb 2014 16:53:40 +0100
   4 Subject: [PATCH 117/182] ata: ahci_platform: Manage SATA PHY
   5
   6 Some platforms have a PHY hooked up to the SATA controller. The PHY
   7 needs to be initialized and powered up for SATA to work. We do that
   8 using the PHY framework.
   9
  10 tj: Minor comment formatting updates.
  11
  12 CC: Balaji T K <balajitk@ti.com>
  13 Signed-off-by: Roger Quadros <rogerq@ti.com>
  14 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  15 Signed-off-by: Tejun Heo<tj@kernel.org>
  16 ---
  17  drivers/ata/ahci.h          |    2 ++
  18  drivers/ata/ahci_platform.c |   47 +++++++++++++++++++++++++++++++++++++++++--
  19  2 files changed, 47 insertions(+), 2 deletions(-)
  20
  21 --- a/drivers/ata/ahci.h
  22 +++ b/drivers/ata/ahci.h
  23 @@ -37,6 +37,7 @@
  24
  25  #include <linux/clk.h>
  26  #include <linux/libata.h>
  27 +#include <linux/phy/phy.h>
  28  #include <linux/regulator/consumer.h>
  29
  30  /* Enclosure Management Control */
  31 @@ -326,6 +327,7 @@ struct ahci_host_priv {
  32         u32                     em_msg_type;    /* EM message type */
  33         struct clk              *clks[AHCI_MAX_CLKS]; /* Optional */
  34         struct regulator        *target_pwr;    /* Optional */
  35 +       struct phy              *phy;           /* If platform uses phy */
  36         void                    *plat_data;     /* Other platform data */
  37         /*
  38          * Optional ahci_start_engine override, if not set this gets set to the
  39 --- a/drivers/ata/ahci_platform.c
  40 +++ b/drivers/ata/ahci_platform.c
  41 @@ -22,6 +22,7 @@
  42  #include <linux/platform_device.h>
  43  #include <linux/libata.h>
  44  #include <linux/ahci_platform.h>
  45 +#include <linux/phy/phy.h>
  46  #include "ahci.h"
  47
  48  static void ahci_host_stop(struct ata_host *host);
  49 @@ -140,6 +141,7 @@ EXPORT_SYMBOL_GPL(ahci_platform_disable_
  50   * following order:
  51   * 1) Regulator
  52   * 2) Clocks (through ahci_platform_enable_clks)
  53 + * 3) Phy
  54   *
  55   * If resource enabling fails at any point the previous enabled resources
  56   * are disabled in reverse order.
  57 @@ -161,8 +163,23 @@ int ahci_platform_enable_resources(struc
  58         if (rc)
  59                 goto disable_regulator;
  60
  61 +       if (hpriv->phy) {
  62 +               rc = phy_init(hpriv->phy);
  63 +               if (rc)
  64 +                       goto disable_clks;
  65 +
  66 +               rc = phy_power_on(hpriv->phy);
  67 +               if (rc) {
  68 +                       phy_exit(hpriv->phy);
  69 +                       goto disable_clks;
  70 +               }
  71 +       }
  72 +
  73         return 0;
  74
  75 +disable_clks:
  76 +       ahci_platform_disable_clks(hpriv);
  77 +
  78  disable_regulator:
  79         if (hpriv->target_pwr)
  80                 regulator_disable(hpriv->target_pwr);
  81 @@ -176,11 +193,17 @@ EXPORT_SYMBOL_GPL(ahci_platform_enable_r
  82   *
  83   * This function disables all ahci_platform managed resources in the
  84   * following order:
  85 - * 1) Clocks (through ahci_platform_disable_clks)
  86 - * 2) Regulator
  87 + * 1) Phy
  88 + * 2) Clocks (through ahci_platform_disable_clks)
  89 + * 3) Regulator
  90   */
  91  void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
  92  {
  93 +       if (hpriv->phy) {
  94 +               phy_power_off(hpriv->phy);
  95 +               phy_exit(hpriv->phy);
  96 +       }
  97 +
  98         ahci_platform_disable_clks(hpriv);
  99
 100         if (hpriv->target_pwr)
 101 @@ -208,6 +231,7 @@ static void ahci_platform_put_resources(
 102   * 2) regulator for controlling the targets power (optional)
 103   * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node,
 104   *    or for non devicetree enabled platforms a single clock
 105 + *     4) phy (optional)
 106   *
 107   * RETURNS:
 108   * The allocated ahci_host_priv on success, otherwise an ERR_PTR value
 109 @@ -266,6 +290,25 @@ struct ahci_host_priv *ahci_platform_get
 110                 hpriv->clks[i] = clk;
 111         }
 112
 113 +       hpriv->phy = devm_phy_get(dev, "sata-phy");
 114 +       if (IS_ERR(hpriv->phy)) {
 115 +               rc = PTR_ERR(hpriv->phy);
 116 +               switch (rc) {
 117 +               case -ENODEV:
 118 +               case -ENOSYS:
 119 +                       /* continue normally */
 120 +                       hpriv->phy = NULL;
 121 +                       break;
 122 +
 123 +               case -EPROBE_DEFER:
 124 +                       goto err_out;
 125 +
 126 +               default:
 127 +                       dev_err(dev, "couldn't get sata-phy\n");
 128 +                       goto err_out;
 129 +               }
 130 +       }
 131 +
 132         devres_remove_group(dev, NULL);
 133         return hpriv;
 134