[PATCH v4 3/6] USB: EHCI: make ehci-s5p a separate driver
Arnd Bergmann
arnd at arndb.de
Sat Mar 30 09:04:20 EDT 2013
From: Manjunath Goudar <manjunath.goudar at linaro.org>
Separate the Samsung S5P/EXYNOS host controller driver from ehci-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 S5P/EXYNOS can
be booted with a multi-platform kernel. We currently expect those
to get merged for 3.10.
With the infrastructure added by Alan Stern in patch 3e0232039
"USB: EHCI: prepare to make ehci-hcd a library module", we can
avoid this problem by turning a bus glue into a separate
module, as we do here for the s5p bus glue.
In V4 (arnd)
- revert some of the pointless changes.
- fix allocation of s5p specific data structure.
In V3:
-Detail commit message added here,why this patch is required.
-MODULE_LICENSE is GPL v2.
-Added .extra_priv_size to eliminate the separate allocation of the s5p_ehci_hcd structure
and removed .reset function pointer initialization.
-Arranged #include's in alphabetical order.
-After using extra_priv_size initialization,struct usb_hcd *hcd is redundant that's why removed
from the prob function.
-Eliminated s5p_ehci_phy_enable,contents of statements moved into the s5p_ehci_probe
-Eliminated s5p_ehci_phy_disable, contents of statements moved into the s5p_ehci_remove.
In V2:
Tegra patch related changes removed from this patch.
Signed-off-by: Manjunath Goudar <manjunath.goudar at linaro.org>
Acked-by: Jingoo Han <jg1.han at samsung.com>
Cc: Greg KH <greg at kroah.com>
Cc: Alan Stern <stern at rowland.harvard.edu>
Cc: Kukjin Kim <kgene.kim at samsung.com>
Cc: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Grant Likely <grant.likely at secretlab.ca>
Cc: Rob Herring <rob.herring at calxeda.com>
Cc: linux-usb at vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd at arndb.de>
---
drivers/usb/host/Kconfig | 5 +-
drivers/usb/host/Makefile | 1 +
drivers/usb/host/ehci-hcd.c | 6 +-
drivers/usb/host/ehci-s5p.c | 164 +++++++++++++++++++++-----------------------
4 files changed, 85 insertions(+), 91 deletions(-)
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 4723f79..98abec0f 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -219,10 +219,11 @@ config USB_EHCI_SH
If you use the PCI EHCI controller, this option is not necessary.
config USB_EHCI_S5P
- boolean "S5P EHCI support"
+ tristate "EHCI support for Samsung S5P/EXYNOS SoC Series"
depends on USB_EHCI_HCD && PLAT_S5P
help
- Enable support for the S5P SOC's on-chip EHCI controller.
+ Enable support for the Samsung S5Pxxxx and Exynos3/4/5 SOC's
+ on-chip EHCI controller.
config USB_EHCI_MV
bool "EHCI support for Marvell PXA/MMP USB controller"
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 3e02471..3d895b5 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_USB_EHCI_MXC) += ehci-mxc.o
obj-$(CONFIG_USB_EHCI_HCD_OMAP) += ehci-omap.o
obj-$(CONFIG_USB_EHCI_HCD_ORION) += ehci-orion.o
obj-$(CONFIG_USB_EHCI_HCD_SPEAR) += ehci-spear.o
+obj-$(CONFIG_USB_EHCI_S5P) += ehci-s5p.o
obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c8c70a1..8f1f4b4 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1284,11 +1284,6 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER tegra_ehci_driver
#endif
-#ifdef CONFIG_USB_EHCI_S5P
-#include "ehci-s5p.c"
-#define PLATFORM_DRIVER s5p_ehci_driver
-#endif
-
#ifdef CONFIG_SPARC_LEON
#include "ehci-grlib.c"
#define PLATFORM_DRIVER ehci_grlib_driver
@@ -1311,6 +1306,7 @@ MODULE_LICENSE ("GPL");
!IS_ENABLED(CONFIG_USB_EHCI_HCD_OMAP) && \
!IS_ENABLED(CONFIG_USB_EHCI_HCD_ORION) && \
!IS_ENABLED(CONFIG_USB_EHCI_HCD_SPEAR) && \
+ !IS_ENABLED(CONFIG_USB_EHCI_S5P) && \
!defined(PLATFORM_DRIVER) && \
!defined(PS3_SYSTEM_BUS_DRIVER) && \
!defined(OF_PLATFORM_DRIVER) && \
diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
index 738490e..3147984 100644
--- a/drivers/usb/host/ehci-s5p.c
+++ b/drivers/usb/host/ehci-s5p.c
@@ -13,13 +13,24 @@
*/
#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/of_gpio.h>
+#include <linux/platform_device.h>
#include <linux/platform_data/usb-ehci-s5p.h>
#include <linux/usb/phy.h>
#include <linux/usb/samsung_usb_phy.h>
#include <plat/usb-phy.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/otg.h>
+
+#include "ehci.h"
+
+#define DRIVER_DESC "EHCI s5p driver"
#define EHCI_INSNREG00(base) (base + 0x90)
#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
@@ -30,65 +41,17 @@
(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
+static const char hcd_name[] = "ehci-s5p";
+static struct hc_driver __read_mostly s5p_ehci_hc_driver;
+
struct s5p_ehci_hcd {
- struct device *dev;
- struct usb_hcd *hcd;
struct clk *clk;
struct usb_phy *phy;
struct usb_otg *otg;
struct s5p_ehci_platdata *pdata;
};
-static const struct hc_driver s5p_ehci_hc_driver = {
- .description = hcd_name,
- .product_desc = "S5P EHCI Host Controller",
- .hcd_priv_size = sizeof(struct ehci_hcd),
-
- .irq = ehci_irq,
- .flags = HCD_MEMORY | HCD_USB2,
-
- .reset = ehci_setup,
- .start = ehci_run,
- .stop = ehci_stop,
- .shutdown = ehci_shutdown,
-
- .get_frame_number = ehci_get_frame,
-
- .urb_enqueue = ehci_urb_enqueue,
- .urb_dequeue = ehci_urb_dequeue,
- .endpoint_disable = ehci_endpoint_disable,
- .endpoint_reset = ehci_endpoint_reset,
-
- .hub_status_data = ehci_hub_status_data,
- .hub_control = ehci_hub_control,
- .bus_suspend = ehci_bus_suspend,
- .bus_resume = ehci_bus_resume,
-
- .relinquish_port = ehci_relinquish_port,
- .port_handed_over = ehci_port_handed_over,
-
- .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
-};
-
-static void s5p_ehci_phy_enable(struct s5p_ehci_hcd *s5p_ehci)
-{
- struct platform_device *pdev = to_platform_device(s5p_ehci->dev);
-
- if (s5p_ehci->phy)
- usb_phy_init(s5p_ehci->phy);
- else if (s5p_ehci->pdata->phy_init)
- s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
-}
-
-static void s5p_ehci_phy_disable(struct s5p_ehci_hcd *s5p_ehci)
-{
- struct platform_device *pdev = to_platform_device(s5p_ehci->dev);
-
- if (s5p_ehci->phy)
- usb_phy_shutdown(s5p_ehci->phy);
- else if (s5p_ehci->pdata->phy_exit)
- s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
-}
+#define to_s5p_ehci(hcd) (struct s5p_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
static void s5p_setup_vbus_gpio(struct platform_device *pdev)
{
@@ -134,11 +97,13 @@ static int s5p_ehci_probe(struct platform_device *pdev)
s5p_setup_vbus_gpio(pdev);
- s5p_ehci = devm_kzalloc(&pdev->dev, sizeof(struct s5p_ehci_hcd),
- GFP_KERNEL);
- if (!s5p_ehci)
+ hcd = usb_create_hcd(&s5p_ehci_hc_driver,
+ &pdev->dev, dev_name(&pdev->dev));
+ if (!hcd) {
+ dev_err(&pdev->dev, "Unable to create HCD\n");
return -ENOMEM;
-
+ }
+ s5p_ehci = to_s5p_ehci(hcd);
phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(phy)) {
/* Fallback to pdata */
@@ -153,16 +118,6 @@ static int s5p_ehci_probe(struct platform_device *pdev)
s5p_ehci->otg = phy->otg;
}
- s5p_ehci->dev = &pdev->dev;
-
- hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
- dev_name(&pdev->dev));
- if (!hcd) {
- dev_err(&pdev->dev, "Unable to create HCD\n");
- return -ENOMEM;
- }
-
- s5p_ehci->hcd = hcd;
s5p_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
if (IS_ERR(s5p_ehci->clk)) {
@@ -199,9 +154,12 @@ static int s5p_ehci_probe(struct platform_device *pdev)
}
if (s5p_ehci->otg)
- s5p_ehci->otg->set_host(s5p_ehci->otg, &s5p_ehci->hcd->self);
+ s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
- s5p_ehci_phy_enable(s5p_ehci);
+ if (s5p_ehci->phy)
+ usb_phy_init(s5p_ehci->phy);
+ else if (s5p_ehci->pdata->phy_init)
+ s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
@@ -220,7 +178,10 @@ static int s5p_ehci_probe(struct platform_device *pdev)
return 0;
fail_add_hcd:
- s5p_ehci_phy_disable(s5p_ehci);
+ if (s5p_ehci->phy)
+ usb_phy_shutdown(s5p_ehci->phy);
+ else if (s5p_ehci->pdata->phy_exit)
+ s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
fail_io:
clk_disable_unprepare(s5p_ehci->clk);
fail_clk:
@@ -230,15 +191,18 @@ fail_clk:
static int s5p_ehci_remove(struct platform_device *pdev)
{
- struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
- struct usb_hcd *hcd = s5p_ehci->hcd;
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
usb_remove_hcd(hcd);
if (s5p_ehci->otg)
- s5p_ehci->otg->set_host(s5p_ehci->otg, &s5p_ehci->hcd->self);
+ s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
- s5p_ehci_phy_disable(s5p_ehci);
+ if (s5p_ehci->phy)
+ usb_phy_shutdown(s5p_ehci->phy);
+ else if (s5p_ehci->pdata->phy_exit)
+ s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
clk_disable_unprepare(s5p_ehci->clk);
@@ -249,8 +213,7 @@ static int s5p_ehci_remove(struct platform_device *pdev)
static void s5p_ehci_shutdown(struct platform_device *pdev)
{
- struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
- struct usb_hcd *hcd = s5p_ehci->hcd;
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
if (hcd->driver->shutdown)
hcd->driver->shutdown(hcd);
@@ -259,17 +222,22 @@ static void s5p_ehci_shutdown(struct platform_device *pdev)
#ifdef CONFIG_PM
static int s5p_ehci_suspend(struct device *dev)
{
- struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
- struct usb_hcd *hcd = s5p_ehci->hcd;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
+ struct platform_device *pdev = to_platform_device(dev);
+
bool do_wakeup = device_may_wakeup(dev);
int rc;
rc = ehci_suspend(hcd, do_wakeup);
if (s5p_ehci->otg)
- s5p_ehci->otg->set_host(s5p_ehci->otg, &s5p_ehci->hcd->self);
+ s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
- s5p_ehci_phy_disable(s5p_ehci);
+ if (s5p_ehci->phy)
+ usb_phy_shutdown(s5p_ehci->phy);
+ else if (s5p_ehci->pdata->phy_exit)
+ s5p_ehci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST);
clk_disable_unprepare(s5p_ehci->clk);
@@ -278,15 +246,19 @@ static int s5p_ehci_suspend(struct device *dev)
static int s5p_ehci_resume(struct device *dev)
{
- struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
- struct usb_hcd *hcd = s5p_ehci->hcd;
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct s5p_ehci_hcd *s5p_ehci = to_s5p_ehci(hcd);
+ struct platform_device *pdev = to_platform_device(dev);
clk_prepare_enable(s5p_ehci->clk);
if (s5p_ehci->otg)
- s5p_ehci->otg->set_host(s5p_ehci->otg, &s5p_ehci->hcd->self);
+ s5p_ehci->otg->set_host(s5p_ehci->otg, &hcd->self);
- s5p_ehci_phy_enable(s5p_ehci);
+ if (s5p_ehci->phy)
+ usb_phy_init(s5p_ehci->phy);
+ else if (s5p_ehci->pdata->phy_init)
+ s5p_ehci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST);
/* DMA burst Enable */
writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
@@ -323,5 +295,29 @@ static struct platform_driver s5p_ehci_driver = {
.of_match_table = of_match_ptr(exynos_ehci_match),
}
};
+static const struct ehci_driver_overrides s5p_overrides __initdata = {
+ .extra_priv_size = sizeof(struct s5p_ehci_hcd),
+};
+
+static int __init ehci_s5p_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+ ehci_init_driver(&s5p_ehci_hc_driver, &s5p_overrides);
+ return platform_driver_register(&s5p_ehci_driver);
+}
+module_init(ehci_s5p_init);
+
+static void __exit ehci_s5p_cleanup(void)
+{
+ platform_driver_unregister(&s5p_ehci_driver);
+}
+module_exit(ehci_s5p_cleanup);
+MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:s5p-ehci");
+MODULE_AUTHOR("Jingoo Han");
+MODULE_AUTHOR("Joonyoung Shim");
+MODULE_LICENSE("GPL v2");
--
1.8.1.2
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