diff mbox

[RFC,2/2] USB: OHCI: make ohci-exynos a separate driver

Message ID 1366269467-15778-3-git-send-email-manjunath.goudar@linaro.org
State New
Headers show

Commit Message

manjunath.goudar@linaro.org April 18, 2013, 7:17 a.m. UTC 
Separate the  Samsung OHCI EXYNOS host controller driver from ohci-hcd
host code so that it can be built as a separate driver module.
This work is part of enabling multi-platform kernels on ARM;
however, note that other changes are still needed before EXYNOS can
be booted with a multi-platform kernel. We currently expect those
to get merged for 3.11.

Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Greg KH <greg@kroah.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org
---
 drivers/usb/host/Kconfig       |    2 +-
 drivers/usb/host/Makefile      |    1 +
 drivers/usb/host/ohci-exynos.c |  161 +++++++++++++++++++---------------------
 drivers/usb/host/ohci-hcd.c    |    5 --
 4 files changed, 80 insertions(+), 89 deletions(-)

Comments

Arnd Bergmann April 18, 2013, 9:34 a.m. UTC | #1 
On Thursday 18 April 2013, Manjunath Goudar wrote:
> Separate the  Samsung OHCI EXYNOS host controller driver from ohci-hcd
> host code so that it can be built as a separate driver module.
> This work is part of enabling multi-platform kernels on ARM;
> however, note that other changes are still needed before EXYNOS can
> be booted with a multi-platform kernel. We currently expect those
> to get merged for 3.11.

Yes, looks correct to me. Just one style comment:

> -static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci)
> -{
> -	struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
> -
> -	if (exynos_ohci->phy)
> -		usb_phy_init(exynos_ohci->phy);
> -	else if (exynos_ohci->pdata->phy_init)
> -		exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
> -}
> -
> -static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
> -{
> -	struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
> -
> -	if (exynos_ohci->phy)
> -		usb_phy_shutdown(exynos_ohci->phy);
> -	else if (exynos_ohci->pdata->phy_exit)
> -		exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
> -}

For the ehci-exynos patch, Alan actually commented that he preferred not to
fold these functions into the caller.

In either case, even if we wanted to do that, it would better be a separate patch.
I'd recommend reverting this part and leaving this function as it is. You
can pass the pdev as a second argument if needed.


	Arnd
diff mbox

Patch

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index bbf1907..42ce228 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -445,7 +445,7 @@  config USB_OHCI_SH
 	  If you use the PCI OHCI controller, this option is not necessary.
 
 config USB_OHCI_EXYNOS
-	boolean "OHCI support for Samsung EXYNOS SoC Series"
+	tristate "OHCI support for Samsung EXYNOS SoC Series"
 	depends on USB_OHCI_HCD && ARCH_EXYNOS
 	help
 	 Enable support for the Samsung Exynos SOC's on-chip OHCI controller.
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index a20a8d9..f148671 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -43,6 +43,7 @@  obj-$(CONFIG_USB_ISP1362_HCD)	+= isp1362-hcd.o
 
 obj-$(CONFIG_USB_OHCI_HCD)	+= ohci-hcd.o
 obj-$(CONFIG_USB_OHCI_PCI)	+= ohci-pci.o
+obj-$(CONFIG_USB_OHCI_EXYNOS)	+= ohci-exynos.o
 
 obj-$(CONFIG_USB_UHCI_HCD)	+= uhci-hcd.o
 obj-$(CONFIG_USB_FHCI_HCD)	+= fhci.o
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index e3b7e85..f671f56 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -12,41 +12,35 @@ 
  */
 
 #include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/platform_data/usb-exynos.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
 #include <linux/usb/phy.h>
 #include <linux/usb/samsung_usb_phy.h>
+#include <linux/usb/otg.h>
 #include <plat/usb-phy.h>
 
+#include "ohci.h"
+
+#define DRIVER_DESC "OHCI exynos driver"
+
+static const char hcd_name[] = "ohci-exynos";
+static struct hc_driver __read_mostly exynos_ohci_hc_driver;
+
 struct exynos_ohci_hcd {
-	struct device *dev;
-	struct usb_hcd *hcd;
 	struct clk *clk;
 	struct usb_phy *phy;
 	struct usb_otg *otg;
 	struct exynos4_ohci_platdata *pdata;
 };
 
-static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci)
-{
-	struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
-
-	if (exynos_ohci->phy)
-		usb_phy_init(exynos_ohci->phy);
-	else if (exynos_ohci->pdata->phy_init)
-		exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
-}
-
-static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
-{
-	struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
-
-	if (exynos_ohci->phy)
-		usb_phy_shutdown(exynos_ohci->phy);
-	else if (exynos_ohci->pdata->phy_exit)
-		exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
-}
+#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
 
 static int ohci_exynos_reset(struct usb_hcd *hcd)
 {
@@ -71,34 +65,6 @@  static int ohci_exynos_start(struct usb_hcd *hcd)
 	return 0;
 }
 
-static const struct hc_driver exynos_ohci_hc_driver = {
-	.description		= hcd_name,
-	.product_desc		= "EXYNOS OHCI Host Controller",
-	.hcd_priv_size		= sizeof(struct ohci_hcd),
-
-	.irq			= ohci_irq,
-	.flags			= HCD_MEMORY|HCD_USB11,
-
-	.reset			= ohci_exynos_reset,
-	.start			= ohci_exynos_start,
-	.stop			= ohci_stop,
-	.shutdown		= ohci_shutdown,
-
-	.get_frame_number	= ohci_get_frame,
-
-	.urb_enqueue		= ohci_urb_enqueue,
-	.urb_dequeue		= ohci_urb_dequeue,
-	.endpoint_disable	= ohci_endpoint_disable,
-
-	.hub_status_data	= ohci_hub_status_data,
-	.hub_control		= ohci_hub_control,
-#ifdef	CONFIG_PM
-	.bus_suspend		= ohci_bus_suspend,
-	.bus_resume		= ohci_bus_resume,
-#endif
-	.start_port_reset	= ohci_start_port_reset,
-};
-
 static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32);
 
 static int exynos_ohci_probe(struct platform_device *pdev)
@@ -122,11 +88,13 @@  static int exynos_ohci_probe(struct platform_device *pdev)
 	if (!pdev->dev.coherent_dma_mask)
 		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 
-	exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd),
-					GFP_KERNEL);
-	if (!exynos_ohci)
+	hcd = usb_create_hcd(&exynos_ohci_hc_driver,
+				&pdev->dev, dev_name(&pdev->dev));
+	if (!hcd) {
+		dev_err(&pdev->dev, "Unable to create HCD\n");
 		return -ENOMEM;
-
+	}
+	exynos_ohci = to_exynos_ohci(hcd);
 	phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(phy)) {
 		/* Fallback to pdata */
@@ -141,16 +109,6 @@  static int exynos_ohci_probe(struct platform_device *pdev)
 		exynos_ohci->otg = phy->otg;
 	}
 
-	exynos_ohci->dev = &pdev->dev;
-
-	hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev,
-					dev_name(&pdev->dev));
-	if (!hcd) {
-		dev_err(&pdev->dev, "Unable to create HCD\n");
-		return -ENOMEM;
-	}
-
-	exynos_ohci->hcd = hcd;
 	exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 
 	if (IS_ERR(exynos_ohci->clk)) {
@@ -187,10 +145,12 @@  static int exynos_ohci_probe(struct platform_device *pdev)
 	}
 
 	if (exynos_ohci->otg)
-		exynos_ohci->otg->set_host(exynos_ohci->otg,
-					&exynos_ohci->hcd->self);
+		exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
 
-	exynos_ohci_phy_enable(exynos_ohci);
+	if (exynos_ohci->phy)
+		usb_phy_init(exynos_ohci->phy);
+	else if (exynos_ohci->pdata->phy_init)
+		exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
 
 	ohci = hcd_to_ohci(hcd);
 	ohci_hcd_init(ohci);
@@ -201,12 +161,15 @@  static int exynos_ohci_probe(struct platform_device *pdev)
 		goto fail_add_hcd;
 	}
 
-	platform_set_drvdata(pdev, exynos_ohci);
+	platform_set_drvdata(pdev, hcd);
 
 	return 0;
 
 fail_add_hcd:
-	exynos_ohci_phy_disable(exynos_ohci);
+	if (exynos_ohci->phy)
+		usb_phy_shutdown(exynos_ohci->phy);
+	else if (exynos_ohci->pdata->phy_exit)
+		exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 fail_io:
 	clk_disable_unprepare(exynos_ohci->clk);
 fail_clk:
@@ -216,16 +179,19 @@  fail_clk:
 
 static int exynos_ohci_remove(struct platform_device *pdev)
 {
-	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
-	struct usb_hcd *hcd = exynos_ohci->hcd;
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 
 	usb_remove_hcd(hcd);
 
 	if (exynos_ohci->otg)
 		exynos_ohci->otg->set_host(exynos_ohci->otg,
-					&exynos_ohci->hcd->self);
+					&hcd->self);
 
-	exynos_ohci_phy_disable(exynos_ohci);
+	if (exynos_ohci->phy)
+		usb_phy_shutdown(exynos_ohci->phy);
+	else if (exynos_ohci->pdata->phy_exit)
+		exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 
 	clk_disable_unprepare(exynos_ohci->clk);
 
@@ -236,8 +202,7 @@  static int exynos_ohci_remove(struct platform_device *pdev)
 
 static void exynos_ohci_shutdown(struct platform_device *pdev)
 {
-	struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev);
-	struct usb_hcd *hcd = exynos_ohci->hcd;
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 
 	if (hcd->driver->shutdown)
 		hcd->driver->shutdown(hcd);
@@ -246,9 +211,10 @@  static void exynos_ohci_shutdown(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int exynos_ohci_suspend(struct device *dev)
 {
-	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
-	struct usb_hcd *hcd = exynos_ohci->hcd;
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+	struct platform_device *pdev = to_platform_device(dev);
 	unsigned long flags;
 	int rc = 0;
 
@@ -268,10 +234,12 @@  static int exynos_ohci_suspend(struct device *dev)
 	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 
 	if (exynos_ohci->otg)
-		exynos_ohci->otg->set_host(exynos_ohci->otg,
-					&exynos_ohci->hcd->self);
+		exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
 
-	exynos_ohci_phy_disable(exynos_ohci);
+	if (exynos_ohci->phy)
+		usb_phy_shutdown(exynos_ohci->phy);
+	else if (exynos_ohci->pdata->phy_exit)
+		exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
 
 	clk_disable_unprepare(exynos_ohci->clk);
 
@@ -283,16 +251,20 @@  fail:
 
 static int exynos_ohci_resume(struct device *dev)
 {
-	struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev);
-	struct usb_hcd *hcd = exynos_ohci->hcd;
+	struct usb_hcd *hcd			= dev_get_drvdata(dev);
+	struct exynos_ohci_hcd *exynos_ohci	= to_exynos_ohci(hcd);
+	struct platform_device *pdev		= to_platform_device(dev);
 
 	clk_prepare_enable(exynos_ohci->clk);
 
 	if (exynos_ohci->otg)
 		exynos_ohci->otg->set_host(exynos_ohci->otg,
-					&exynos_ohci->hcd->self);
+					&hcd->self);
 
-	exynos_ohci_phy_enable(exynos_ohci);
+	if (exynos_ohci->phy)
+		usb_phy_init(exynos_ohci->phy);
+	else if (exynos_ohci->pdata->phy_init)
+		exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
 
 	ohci_resume(hcd, false);
 
@@ -303,6 +275,12 @@  static int exynos_ohci_resume(struct device *dev)
 #define exynos_ohci_resume	NULL
 #endif
 
+static const struct ohci_driver_overrides exynos_overrides = {
+	.extra_priv_size =	sizeof(struct exynos_ohci_hcd),
+	.reset =		ohci_exynos_reset,
+	.start =		ohci_exynos_start,
+};
+
 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 	.suspend	= exynos_ohci_suspend,
 	.resume		= exynos_ohci_resume,
@@ -327,6 +305,23 @@  static struct platform_driver exynos_ohci_driver = {
 		.of_match_table	= of_match_ptr(exynos_ohci_match),
 	}
 };
+static int __init ehci_exynos_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+	ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
+	return platform_driver_register(&exynos_ohci_driver);
+}
+module_init(ehci_exynos_init);
+
+static void __exit ehci_exynos_cleanup(void)
+{
+	platform_driver_unregister(&exynos_ohci_driver);
+}
+module_exit(ehci_exynos_cleanup);
 
 MODULE_ALIAS("platform:exynos-ohci");
 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 3d624c2..8881e1a 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1152,11 +1152,6 @@  MODULE_LICENSE ("GPL");
 #define S3C2410_PLATFORM_DRIVER	ohci_hcd_s3c2410_driver
 #endif
 
-#ifdef CONFIG_USB_OHCI_EXYNOS
-#include "ohci-exynos.c"
-#define EXYNOS_PLATFORM_DRIVER	exynos_ohci_driver
-#endif
-
 #ifdef CONFIG_USB_OHCI_HCD_OMAP1
 #include "ohci-omap.c"
 #define OMAP1_PLATFORM_DRIVER	ohci_hcd_omap_driver