summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci-exynos.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/host/ehci-exynos.c')
-rw-r--r--drivers/usb/host/ehci-exynos.c129
1 files changed, 109 insertions, 20 deletions
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index 4d763dc91f70..c7081c75de8a 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
+#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/usb/phy.h>
#include <linux/usb/samsung_usb_phy.h>
@@ -42,14 +43,104 @@
static const char hcd_name[] = "ehci-exynos";
static struct hc_driver __read_mostly exynos_ehci_hc_driver;
+#define PHY_NUMBER 3
+
struct exynos_ehci_hcd {
struct clk *clk;
struct usb_phy *phy;
struct usb_otg *otg;
+ struct phy *phy_g[PHY_NUMBER];
};
#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
+static int exynos_ehci_get_phy(struct device *dev,
+ struct exynos_ehci_hcd *exynos_ehci)
+{
+ struct device_node *child;
+ struct phy *phy;
+ int phy_number;
+ int ret = 0;
+
+ exynos_ehci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+ if (IS_ERR(exynos_ehci->phy)) {
+ ret = PTR_ERR(exynos_ehci->phy);
+ if (ret != -ENXIO && ret != -ENODEV) {
+ dev_err(dev, "no usb2 phy configured\n");
+ return ret;
+ }
+ dev_dbg(dev, "Failed to get usb2 phy\n");
+ } else {
+ exynos_ehci->otg = exynos_ehci->phy->otg;
+ }
+
+ for_each_available_child_of_node(dev->of_node, child) {
+ ret = of_property_read_u32(child, "reg", &phy_number);
+ if (ret) {
+ dev_err(dev, "Failed to parse device tree\n");
+ of_node_put(child);
+ return ret;
+ }
+
+ if (phy_number >= PHY_NUMBER) {
+ dev_err(dev, "Invalid number of PHYs\n");
+ of_node_put(child);
+ return -EINVAL;
+ }
+
+ phy = devm_of_phy_get(dev, child, 0);
+ of_node_put(child);
+ if (IS_ERR(phy)) {
+ ret = PTR_ERR(phy);
+ if (ret != -ENOSYS && ret != -ENODEV) {
+ dev_err(dev, "no usb2 phy configured\n");
+ return ret;
+ }
+ dev_dbg(dev, "Failed to get usb2 phy\n");
+ }
+ exynos_ehci->phy_g[phy_number] = phy;
+ }
+
+ return ret;
+}
+
+static int exynos_ehci_phy_enable(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+ int i;
+ int ret = 0;
+
+ if (!IS_ERR(exynos_ehci->phy))
+ return usb_phy_init(exynos_ehci->phy);
+
+ for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
+ if (!IS_ERR(exynos_ehci->phy_g[i]))
+ ret = phy_power_on(exynos_ehci->phy_g[i]);
+ if (ret)
+ for (i--; i >= 0; i--)
+ if (!IS_ERR(exynos_ehci->phy_g[i]))
+ phy_power_off(exynos_ehci->phy_g[i]);
+
+ return ret;
+}
+
+static void exynos_ehci_phy_disable(struct device *dev)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+ int i;
+
+ if (!IS_ERR(exynos_ehci->phy)) {
+ usb_phy_shutdown(exynos_ehci->phy);
+ return;
+ }
+
+ for (i = 0; i < PHY_NUMBER; i++)
+ if (!IS_ERR(exynos_ehci->phy_g[i]))
+ phy_power_off(exynos_ehci->phy_g[i]);
+}
+
static void exynos_setup_vbus_gpio(struct device *dev)
{
int err;
@@ -74,7 +165,6 @@ static int exynos_ehci_probe(struct platform_device *pdev)
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct resource *res;
- struct usb_phy *phy;
int irq;
int err;
@@ -101,15 +191,9 @@ static int exynos_ehci_probe(struct platform_device *pdev)
"samsung,exynos5440-ehci"))
goto skip_phy;
- phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
- if (IS_ERR(phy)) {
- usb_put_hcd(hcd);
- dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
- return -EPROBE_DEFER;
- } else {
- exynos_ehci->phy = phy;
- exynos_ehci->otg = phy->otg;
- }
+ err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
+ if (err)
+ goto fail_clk;
skip_phy:
@@ -151,8 +235,11 @@ skip_phy:
if (exynos_ehci->otg)
exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
- if (exynos_ehci->phy)
- usb_phy_init(exynos_ehci->phy);
+ err = exynos_ehci_phy_enable(&pdev->dev);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to enable USB phy\n");
+ goto fail_io;
+ }
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
@@ -172,8 +259,7 @@ skip_phy:
return 0;
fail_add_hcd:
- if (exynos_ehci->phy)
- usb_phy_shutdown(exynos_ehci->phy);
+ exynos_ehci_phy_disable(&pdev->dev);
fail_io:
clk_disable_unprepare(exynos_ehci->clk);
fail_clk:
@@ -191,8 +277,7 @@ static int exynos_ehci_remove(struct platform_device *pdev)
if (exynos_ehci->otg)
exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
- if (exynos_ehci->phy)
- usb_phy_shutdown(exynos_ehci->phy);
+ exynos_ehci_phy_disable(&pdev->dev);
clk_disable_unprepare(exynos_ehci->clk);
@@ -217,8 +302,7 @@ static int exynos_ehci_suspend(struct device *dev)
if (exynos_ehci->otg)
exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
- if (exynos_ehci->phy)
- usb_phy_shutdown(exynos_ehci->phy);
+ exynos_ehci_phy_disable(dev);
clk_disable_unprepare(exynos_ehci->clk);
@@ -229,14 +313,19 @@ static int exynos_ehci_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+ int ret;
clk_prepare_enable(exynos_ehci->clk);
if (exynos_ehci->otg)
exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
- if (exynos_ehci->phy)
- usb_phy_init(exynos_ehci->phy);
+ ret = exynos_ehci_phy_enable(dev);
+ if (ret) {
+ dev_err(dev, "Failed to enable USB phy\n");
+ clk_disable_unprepare(exynos_ehci->clk);
+ return ret;
+ }
/* DMA burst Enable */
writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));