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authorVivek Gautam <gautam.vivek@samsung.com>2014-05-05 09:02:57 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-28 01:50:20 +0400
commit7d28e54b8d8dee31323433f5563534fc273bcda8 (patch)
tree5cb369eec49a36362cfca1657a1d0f6e1aee3904 /drivers/usb/host/ohci-exynos.c
parent91a9677a4ae611eb468b02c531ee3d673988d648 (diff)
downloadlinux-7d28e54b8d8dee31323433f5563534fc273bcda8.tar.xz
usb: ohci-exynos: Add facility to use phy provided by the generic phy framework
Add support to consume phy provided by Generic phy framework. Keeping the support for older usb-phy intact right now, in order to prevent any functionality break in absence of relevant device tree side change for ohci-exynos. Once we move to new phy in the device nodes for ohci, we can remove the support for older phys. Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com> Cc: Jingoo Han <jg1.han@samsung.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Reviewed-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ohci-exynos.c')
-rw-r--r--drivers/usb/host/ohci-exynos.c118
1 files changed, 102 insertions, 16 deletions
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index 05f00e3098fc..32f2ff1e93ce 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
#include <linux/usb/phy.h>
#include <linux/usb/samsung_usb_phy.h>
#include <linux/usb.h>
@@ -33,28 +34,110 @@ static struct hc_driver __read_mostly exynos_ohci_hc_driver;
#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
+#define PHY_NUMBER 3
+
struct exynos_ohci_hcd {
struct clk *clk;
struct usb_phy *phy;
struct usb_otg *otg;
+ struct phy *phy_g[PHY_NUMBER];
};
-static void exynos_ohci_phy_enable(struct device *dev)
+static int exynos_ohci_get_phy(struct device *dev,
+ struct exynos_ohci_hcd *exynos_ohci)
+{
+ struct device_node *child;
+ struct phy *phy;
+ int phy_number;
+ int ret = 0;
+
+ exynos_ohci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+ if (IS_ERR(exynos_ohci->phy)) {
+ ret = PTR_ERR(exynos_ohci->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_ohci->otg = exynos_ohci->phy->otg;
+ }
+
+ /*
+ * Getting generic phy:
+ * We are keeping both types of phys as a part of transiting OHCI
+ * to generic phy framework, so as to maintain backward compatibilty
+ * with old DTB.
+ * If there are existing devices using DTB files built from them,
+ * to remove the support for old bindings in this driver,
+ * we need to make sure that such devices have their DTBs
+ * updated to ones built from new DTS.
+ */
+ 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_ohci->phy_g[phy_number] = phy;
+ }
+
+ return ret;
+}
+
+static int exynos_ohci_phy_enable(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ int i;
+ int ret = 0;
+
+ if (!IS_ERR(exynos_ohci->phy))
+ return usb_phy_init(exynos_ohci->phy);
- if (exynos_ohci->phy)
- usb_phy_init(exynos_ohci->phy);
+ for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
+ if (!IS_ERR(exynos_ohci->phy_g[i]))
+ ret = phy_power_on(exynos_ohci->phy_g[i]);
+ if (ret)
+ for (i--; i >= 0; i--)
+ if (!IS_ERR(exynos_ohci->phy_g[i]))
+ phy_power_off(exynos_ohci->phy_g[i]);
+
+ return ret;
}
static void exynos_ohci_phy_disable(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ int i;
- if (exynos_ohci->phy)
+ if (!IS_ERR(exynos_ohci->phy)) {
usb_phy_shutdown(exynos_ohci->phy);
+ return;
+ }
+
+ for (i = 0; i < PHY_NUMBER; i++)
+ if (!IS_ERR(exynos_ohci->phy_g[i]))
+ phy_power_off(exynos_ohci->phy_g[i]);
}
static int exynos_ohci_probe(struct platform_device *pdev)
@@ -62,7 +145,6 @@ static int exynos_ohci_probe(struct platform_device *pdev)
struct exynos_ohci_hcd *exynos_ohci;
struct usb_hcd *hcd;
struct resource *res;
- struct usb_phy *phy;
int irq;
int err;
@@ -88,15 +170,9 @@ static int exynos_ohci_probe(struct platform_device *pdev)
"samsung,exynos5440-ohci"))
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_ohci->phy = phy;
- exynos_ohci->otg = phy->otg;
- }
+ err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
+ if (err)
+ goto fail_clk;
skip_phy:
exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
@@ -139,7 +215,11 @@ skip_phy:
platform_set_drvdata(pdev, hcd);
- exynos_ohci_phy_enable(&pdev->dev);
+ err = exynos_ohci_phy_enable(&pdev->dev);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to enable USB phy\n");
+ goto fail_io;
+ }
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err) {
@@ -210,13 +290,19 @@ static int exynos_ohci_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
+ int ret;
clk_prepare_enable(exynos_ohci->clk);
if (exynos_ohci->otg)
exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
- exynos_ohci_phy_enable(dev);
+ ret = exynos_ohci_phy_enable(dev);
+ if (ret) {
+ dev_err(dev, "Failed to enable USB phy\n");
+ clk_disable_unprepare(exynos_ohci->clk);
+ return ret;
+ }
ohci_resume(hcd, false);