[PATCH V4 1/6] USB: OHCI: make ohci-exynos a separate driver
Manjunath Goudar
manjunath.goudar at linaro.org
Wed Jul 31 02:07:59 EDT 2013
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;
it would be nice to have in 3.11.
Signed-off-by: Manjunath Goudar <manjunath.goudar at linaro.org>
Acked-by: Alan Stern <stern at rowland.harvard.edu>
Acked-by: Jingoo Han <jg1.han at samsung.com>
Cc: Vivek Gautam <gautam.vivek at samsung.com>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Kukjin Kim <kgene.kim at samsung.com>
Cc: Greg KH <greg at kroah.com>
Cc: linux-usb at vger.kernel.org
V2:
-exynos_ohci_hcd structure assignment error fixed.
-Removed multiple usb_create_hcd() from prob funtion.
-platform_set_drvdata() called before exynos_ohci_phy_enable().
-ohci_setup() removed because it is called in .reset member
of the ohci_hc_driver structure
V3:
-No major changes only "exynos" written in capital letters
in "OHCI exynos driver".
---
drivers/usb/host/Kconfig | 2 +-
drivers/usb/host/Makefile | 1 +
drivers/usb/host/ohci-exynos.c | 167 +++++++++++++++++-----------------------
drivers/usb/host/ohci-hcd.c | 18 -----
4 files changed, 71 insertions(+), 117 deletions(-)
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 7bc598b..7b8f6bd 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -463,7 +463,7 @@ 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 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 480e203..26cf69a 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_USB_ISP1362_HCD) += isp1362-hcd.o
obj-$(CONFIG_USB_OHCI_HCD) += ohci-hcd.o
obj-$(CONFIG_USB_OHCI_HCD_PCI) += ohci-pci.o
obj-$(CONFIG_USB_OHCI_HCD_PLATFORM) += ohci-platform.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 b0b542c..ae6068d 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -12,24 +12,39 @@
*/
#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-ohci-exynos.h>
#include <linux/usb/phy.h>
#include <linux/usb/samsung_usb_phy.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/otg.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;
+
+#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
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)
+static void exynos_ohci_phy_enable(struct platform_device *pdev)
{
- struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
if (exynos_ohci->phy)
usb_phy_init(exynos_ohci->phy);
@@ -37,9 +52,10 @@ static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci)
exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
}
-static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
+static void exynos_ohci_phy_disable(struct platform_device *pdev)
{
- struct platform_device *pdev = to_platform_device(exynos_ohci->dev);
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
if (exynos_ohci->phy)
usb_phy_shutdown(exynos_ohci->phy);
@@ -47,63 +63,11 @@ static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci)
exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
}
-static int ohci_exynos_reset(struct usb_hcd *hcd)
-{
- return ohci_init(hcd_to_ohci(hcd));
-}
-
-static int ohci_exynos_start(struct usb_hcd *hcd)
-{
- struct ohci_hcd *ohci = hcd_to_ohci(hcd);
- int ret;
-
- ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci);
-
- ret = ohci_run(ohci);
- if (ret < 0) {
- dev_err(hcd->self.controller, "can't start %s\n",
- hcd->self.bus_name);
- ohci_stop(hcd);
- return ret;
- }
-
- 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 int exynos_ohci_probe(struct platform_device *pdev)
{
struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data;
struct exynos_ohci_hcd *exynos_ohci;
struct usb_hcd *hcd;
- struct ohci_hcd *ohci;
struct resource *res;
struct usb_phy *phy;
int irq;
@@ -119,10 +83,14 @@ 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);
if (of_device_is_compatible(pdev->dev.of_node,
"samsung,exynos5440-ohci"))
@@ -143,17 +111,6 @@ static int exynos_ohci_probe(struct platform_device *pdev)
}
skip_phy:
-
- 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)) {
@@ -190,26 +147,21 @@ skip_phy:
}
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);
+ platform_set_drvdata(pdev, hcd);
- ohci = hcd_to_ohci(hcd);
- ohci_hcd_init(ohci);
+ exynos_ohci_phy_enable(pdev);
err = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (err) {
dev_err(&pdev->dev, "Failed to add USB HCD\n");
goto fail_add_hcd;
}
-
- platform_set_drvdata(pdev, exynos_ohci);
-
return 0;
fail_add_hcd:
- exynos_ohci_phy_disable(exynos_ohci);
+ exynos_ohci_phy_disable(pdev);
fail_io:
clk_disable_unprepare(exynos_ohci->clk);
fail_clk:
@@ -219,16 +171,15 @@ 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);
+ exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
- exynos_ohci_phy_disable(exynos_ohci);
+ exynos_ohci_phy_disable(pdev);
clk_disable_unprepare(exynos_ohci->clk);
@@ -239,8 +190,7 @@ 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);
@@ -249,9 +199,10 @@ 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;
@@ -271,10 +222,9 @@ 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);
+ exynos_ohci_phy_disable(pdev);
clk_disable_unprepare(exynos_ohci->clk);
@@ -286,16 +236,16 @@ 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);
+ exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
- exynos_ohci_phy_enable(exynos_ohci);
+ exynos_ohci_phy_enable(pdev);
ohci_resume(hcd, false);
@@ -306,6 +256,10 @@ static int exynos_ohci_resume(struct device *dev)
#define exynos_ohci_resume NULL
#endif
+static const struct ohci_driver_overrides exynos_overrides __initconst = {
+ .extra_priv_size = sizeof(struct exynos_ohci_hcd),
+};
+
static const struct dev_pm_ops exynos_ohci_pm_ops = {
.suspend = exynos_ohci_suspend,
.resume = exynos_ohci_resume,
@@ -331,6 +285,23 @@ static struct platform_driver exynos_ohci_driver = {
.of_match_table = of_match_ptr(exynos_ohci_match),
}
};
+static int __init ohci_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(ohci_exynos_init);
+
+static void __exit ohci_exynos_cleanup(void)
+{
+ platform_driver_unregister(&exynos_ohci_driver);
+}
+module_exit(ohci_exynos_cleanup);
MODULE_ALIAS("platform:exynos-ohci");
MODULE_AUTHOR("Jingoo Han <jg1.han at samsung.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index a9d3437..2980bb6 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1182,11 +1182,6 @@ 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
@@ -1336,12 +1331,6 @@ static int __init ohci_hcd_mod_init(void)
goto error_s3c2410;
#endif
-#ifdef EXYNOS_PLATFORM_DRIVER
- retval = platform_driver_register(&EXYNOS_PLATFORM_DRIVER);
- if (retval < 0)
- goto error_exynos;
-#endif
-
#ifdef EP93XX_PLATFORM_DRIVER
retval = platform_driver_register(&EP93XX_PLATFORM_DRIVER);
if (retval < 0)
@@ -1395,10 +1384,6 @@ static int __init ohci_hcd_mod_init(void)
platform_driver_unregister(&EP93XX_PLATFORM_DRIVER);
error_ep93xx:
#endif
-#ifdef EXYNOS_PLATFORM_DRIVER
- platform_driver_unregister(&EXYNOS_PLATFORM_DRIVER);
- error_exynos:
-#endif
#ifdef S3C2410_PLATFORM_DRIVER
platform_driver_unregister(&S3C2410_PLATFORM_DRIVER);
error_s3c2410:
@@ -1463,9 +1448,6 @@ static void __exit ohci_hcd_mod_exit(void)
#ifdef EP93XX_PLATFORM_DRIVER
platform_driver_unregister(&EP93XX_PLATFORM_DRIVER);
#endif
-#ifdef EXYNOS_PLATFORM_DRIVER
- platform_driver_unregister(&EXYNOS_PLATFORM_DRIVER);
-#endif
#ifdef S3C2410_PLATFORM_DRIVER
platform_driver_unregister(&S3C2410_PLATFORM_DRIVER);
#endif
--
1.7.9.5
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