On Thursday 09 January 2014 04:26 PM, Roger Quadros wrote:
> 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>
Acked-by: Kishon Vijay Abraham I <kis...@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);
>
--
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