Merge remote-tracking branch 'libata/for-next'

[karo-tx-linux.git] / drivers / ata / ahci_imx.c

diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
index 58debb0acc3a73743ea247f0c6b260368cd67f4b..ae2d73fe321e2f2c62d8e5709a788905edfd5a89 100644 (file)
--- a/drivers/ata/ahci_imx.c
+++ b/drivers/ata/ahci_imx.c
@@ -1,6 +1,6 @@
 /*
+ * copyright (c) 2013 Freescale Semiconductor, Inc.
  * Freescale IMX AHCI SATA platform driver
- * Copyright 2013 Freescale Semiconductor, Inc.
  *
  * based on the AHCI SATA platform driver by Jeff Garzik and Anton Vorontsov
  *
@@ -25,10 +25,13 @@
 #include <linux/of_device.h>
 #include <linux/mfd/syscon.h>
 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
+#include <linux/libata.h>
 #include "ahci.h"
 
 enum {
-       HOST_TIMER1MS = 0xe0, /* Timer 1-ms */
+       PORT_PHY_CTL = 0x178,                   /* Port0 PHY Control */
+       PORT_PHY_CTL_PDDQ_LOC = 0x100000,       /* PORT_PHY_CTL bits */
+       HOST_TIMER1MS = 0xe0,                   /* Timer 1-ms */
 };
 
 struct imx_ahci_priv {
@@ -36,6 +39,56 @@ struct imx_ahci_priv {
        struct clk *sata_ref_clk;
        struct clk *ahb_clk;
        struct regmap *gpr;
+       bool no_device;
+       bool first_time;
+};
+
+static int ahci_imx_hotplug;
+module_param_named(hotplug, ahci_imx_hotplug, int, 0644);
+MODULE_PARM_DESC(hotplug, "AHCI IMX hot-plug support (0=Don't support, 1=support)");
+
+static void ahci_imx_error_handler(struct ata_port *ap)
+{
+       u32 reg_val;
+       struct ata_device *dev;
+       struct ata_host *host = dev_get_drvdata(ap->dev);
+       struct ahci_host_priv *hpriv = host->private_data;
+       void __iomem *mmio = hpriv->mmio;
+       struct imx_ahci_priv *imxpriv = dev_get_drvdata(ap->dev->parent);
+
+       ahci_error_handler(ap);
+
+       if (!(imxpriv->first_time) || ahci_imx_hotplug)
+               return;
+
+       imxpriv->first_time = false;
+
+       ata_for_each_dev(dev, &ap->link, ENABLED)
+               return;
+       /*
+        * Disable link to save power.  An imx ahci port can't be recovered
+        * without full reset once the pddq mode is enabled making it
+        * impossible to use as part of libata LPM.
+        */
+       reg_val = readl(mmio + PORT_PHY_CTL);
+       writel(reg_val | PORT_PHY_CTL_PDDQ_LOC, mmio + PORT_PHY_CTL);
+       regmap_update_bits(imxpriv->gpr, IOMUXC_GPR13,
+                       IMX6Q_GPR13_SATA_MPLL_CLK_EN,
+                       !IMX6Q_GPR13_SATA_MPLL_CLK_EN);
+       clk_disable_unprepare(imxpriv->sata_ref_clk);
+       imxpriv->no_device = true;
+}
+
+static struct ata_port_operations ahci_imx_ops = {
+       .inherits       = &ahci_platform_ops,
+       .error_handler  = ahci_imx_error_handler,
+};
+
+static const struct ata_port_info ahci_imx_port_info = {
+       .flags          = AHCI_FLAG_COMMON,
+       .pio_mask       = ATA_PIO4,
+       .udma_mask      = ATA_UDMA6,
+       .port_ops       = &ahci_imx_ops,
 };
 
 static int imx6q_sata_init(struct device *dev, void __iomem *mmio)
@@ -117,9 +170,51 @@ static void imx6q_sata_exit(struct device *dev)
        clk_disable_unprepare(imxpriv->sata_ref_clk);
 }
 
+static int imx_ahci_suspend(struct device *dev)
+{
+       struct imx_ahci_priv *imxpriv =  dev_get_drvdata(dev->parent);
+
+       /*
+        * If no_device is set, The CLKs had been gated off in the
+        * initialization so don't do it again here.
+        */
+       if (!imxpriv->no_device) {
+               regmap_update_bits(imxpriv->gpr, IOMUXC_GPR13,
+                               IMX6Q_GPR13_SATA_MPLL_CLK_EN,
+                               !IMX6Q_GPR13_SATA_MPLL_CLK_EN);
+               clk_disable_unprepare(imxpriv->sata_ref_clk);
+       }
+
+       return 0;
+}
+
+static int imx_ahci_resume(struct device *dev)
+{
+       struct imx_ahci_priv *imxpriv =  dev_get_drvdata(dev->parent);
+       int ret;
+
+       if (!imxpriv->no_device) {
+               ret = clk_prepare_enable(imxpriv->sata_ref_clk);
+               if (ret < 0) {
+                       dev_err(dev, "pre-enable sata_ref clock err:%d\n", ret);
+                       return ret;
+               }
+
+               regmap_update_bits(imxpriv->gpr, IOMUXC_GPR13,
+                               IMX6Q_GPR13_SATA_MPLL_CLK_EN,
+                               IMX6Q_GPR13_SATA_MPLL_CLK_EN);
+               usleep_range(1000, 2000);
+       }
+
+       return 0;
+}
+
 static struct ahci_platform_data imx6q_sata_pdata = {
        .init = imx6q_sata_init,
        .exit = imx6q_sata_exit,
+       .ata_port_info = &ahci_imx_port_info,
+       .suspend = imx_ahci_suspend,
+       .resume = imx_ahci_resume,
 };
 
 static const struct of_device_id imx_ahci_of_match[] = {
@@ -152,6 +247,8 @@ static int imx_ahci_probe(struct platform_device *pdev)
        ahci_dev = &ahci_pdev->dev;
        ahci_dev->parent = dev;
 
+       imxpriv->no_device = false;
+       imxpriv->first_time = true;
        imxpriv->ahb_clk = devm_clk_get(dev, "ahb");
        if (IS_ERR(imxpriv->ahb_clk)) {
                dev_err(dev, "can't get ahb clock.\n");