diff options
| author | Roger Quadros <rogerq@ti.com> | 2014-02-22 19:53:40 +0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-23 00:35:43 +0400 |
| commit | 21b5faeec229d4f70a7f60a7b0b065c98198f491 (patch) | |
| tree | 5d85aec26355adea114e096654c4d3fb15a49086 /drivers/ata/ahci_platform.c | |
| parent | 42a7f53ba0f2baa2ea23cd830511cea7f8612dd2 (diff) | |
| download | linux-21b5faeec229d4f70a7f60a7b0b065c98198f491.tar.xz | |
ata: ahci_platform: Manage SATA PHY
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.
tj: Minor comment formatting updates.
CC: Balaji T K <balajitk@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tejun Heo<tj@kernel.org>
Diffstat (limited to 'drivers/ata/ahci_platform.c')
| -rw-r--r-- | drivers/ata/ahci_platform.c | 47 |
1 files changed, 45 insertions, 2 deletions
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c index 968e7d94af17..243dde36cd98 100644 --- a/drivers/ata/ahci_platform.c +++ b/drivers/ata/ahci_platform.c @@ -22,6 +22,7 @@ #include <linux/platform_device.h> #include <linux/libata.h> #include <linux/ahci_platform.h> +#include <linux/phy/phy.h> #include "ahci.h" static void ahci_host_stop(struct ata_host *host); @@ -140,6 +141,7 @@ EXPORT_SYMBOL_GPL(ahci_platform_disable_clks); * following order: * 1) Regulator * 2) Clocks (through ahci_platform_enable_clks) + * 3) Phy * * If resource enabling fails at any point the previous enabled resources * are disabled in reverse order. @@ -161,8 +163,23 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv) if (rc) goto disable_regulator; + if (hpriv->phy) { + rc = phy_init(hpriv->phy); + if (rc) + goto disable_clks; + + rc = phy_power_on(hpriv->phy); + if (rc) { + phy_exit(hpriv->phy); + goto disable_clks; + } + } + return 0; +disable_clks: + ahci_platform_disable_clks(hpriv); + disable_regulator: if (hpriv->target_pwr) regulator_disable(hpriv->target_pwr); @@ -176,11 +193,17 @@ EXPORT_SYMBOL_GPL(ahci_platform_enable_resources); * * This function disables all ahci_platform managed resources in the * following order: - * 1) Clocks (through ahci_platform_disable_clks) - * 2) Regulator + * 1) Phy + * 2) Clocks (through ahci_platform_disable_clks) + * 3) Regulator */ void ahci_platform_disable_resources(struct ahci_host_priv *hpriv) { + if (hpriv->phy) { + phy_power_off(hpriv->phy); + phy_exit(hpriv->phy); + } + ahci_platform_disable_clks(hpriv); if (hpriv->target_pwr) @@ -208,6 +231,7 @@ static void ahci_platform_put_resources(struct device *dev, void *res) * 2) regulator for controlling the targets power (optional) * 3) 0 - AHCI_MAX_CLKS clocks, as specified in the devs devicetree node, * or for non devicetree enabled platforms a single clock + * 4) phy (optional) * * RETURNS: * The allocated ahci_host_priv on success, otherwise an ERR_PTR value @@ -266,6 +290,25 @@ struct ahci_host_priv *ahci_platform_get_resources( hpriv->clks[i] = clk; } + 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 err_out; + + default: + dev_err(dev, "couldn't get sata-phy\n"); + goto err_out; + } + } + devres_remove_group(dev, NULL); return hpriv; |