From: Richard Zhu <r65037@xxxxxxxxxxxxx>
In order to save power consumption amap.
* Disable sata phy internal pll reference clock when
sysetem enter into suspend mode, enable it after resume.
* Enter into test power down mode(PDDQ) and don't support
hot-plug feature anymore, when there is no device detected
on the port.
NOTE:
- The hot-plug can't be supported when PDDQ mode is
ever enabled.
- module parameter usage how-to:
* default: enable PDDQ mode when no device detected.
* add "ahci-imx.hotplug=1" into kernel command line if
your don't want to enable PDDQ mode when no device
detected on the port.
Signed-off-by: Richard Zhu <r65037@xxxxxxxxxxxxx>
---
drivers/ata/ahci_imx.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 123 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
index 58debb0..58cdff74 100644
--- 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
*
@@ -25,9 +25,17 @@
#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"
+static void ahci_imx_error_handler(struct ata_port *ap);
+static void ahci_host_stop(struct ata_host *host);
+
enum {
+ /* Port0 PHY Control */
+ PORT_PHY_CTL = 0x178,
+ /* PORT_PHY_CTL bits */
+ PORT_PHY_CTL_PDDQ_LOC = 0x100000,
HOST_TIMER1MS = 0xe0, /* Timer 1-ms */
};
@@ -36,12 +44,85 @@ struct imx_ahci_priv {
struct clk *sata_ref_clk;
struct clk *ahb_clk;
struct regmap *gpr;
+ bool no_device;
+ bool first_time;
+};
+
+static struct ata_port_operations ahci_imx_ops = {
+ .inherits = &ahci_ops,
+ .host_stop = ahci_host_stop,
+ .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 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);
+
+ /* wrapper of the ahci_error_handler */
+ if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
+ /* restart engine */
+ ahci_stop_engine(ap);
+ ahci_start_engine(ap);
+ }
+
+ sata_pmp_error_handler(ap);
+
+ if (!ata_dev_enabled(ap->link.device))
+ ahci_stop_engine(ap);
+ /* end of wrapper */
+
+ 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 consumption */
+ 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 void ahci_host_stop(struct ata_host *host)
+{
+ struct device *dev = host->dev;
+ struct ahci_platform_data *pdata = dev_get_platdata(dev);
+ struct ahci_host_priv *hpriv = host->private_data;
+
+ if (pdata && pdata->exit)
+ pdata->exit(dev);
+
+ if (!IS_ERR(hpriv->clk)) {
+ clk_disable_unprepare(hpriv->clk);
+ clk_put(hpriv->clk);
+ }
+}
+
static int imx6q_sata_init(struct device *dev, void __iomem *mmio)
{
int ret = 0;
- unsigned int reg_val;
+ u32 reg_val;
struct imx_ahci_priv *imxpriv = dev_get_drvdata(dev->parent);
imxpriv->gpr =
@@ -117,9 +198,47 @@ 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 (!(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 +271,8 @@ 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");
--
1.7.5.4
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