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USB: EHCI: make ehci-tegra a separate driver 

Separate the Tegra on-chip 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.

Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org>
[swarren, reworked Manjunath's patches to split them more logically,
minor re-order of added lines to better match layout of other split-up
HCD drivers and existing code, add MODULE_DEVICE_TABLE, fix
MODULE_LICENSE, adapted to change in earlier patches which removed the
ehci_driver_overrides addition, removed all PM code and solved circular
dependencies.]
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manjunath Goudar 2013-06-13 11:24:12 -06:00 committed by Greg Kroah-Hartman
parent 91a687d8fe
commit 9fc5f24e43
4 changed files with 76 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/host/Kconfig
View File

@ -198,7 +198,7 @@ config USB_EHCI_MSM
has an external PHY.
config USB_EHCI_TEGRA
boolean "NVIDIA Tegra HCD support"
tristate "NVIDIA Tegra HCD support"
depends on ARCH_TEGRA
select USB_EHCI_ROOT_HUB_TT
select USB_PHY

1
drivers/usb/host/Makefile
View File

@ -33,6 +33,7 @@ obj-$(CONFIG_USB_EHCI_HCD_SPEAR) += ehci-spear.o
obj-$(CONFIG_USB_EHCI_S5P) += ehci-s5p.o
obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o

5
drivers/usb/host/ehci-hcd.c
View File

@ -1269,11 +1269,6 @@ MODULE_LICENSE ("GPL");
#define PLATFORM_DRIVER ehci_hcd_msp_driver
#endif
#ifdef CONFIG_USB_EHCI_TEGRA
#include "ehci-tegra.c"
#define PLATFORM_DRIVER tegra_ehci_driver
#endif
#ifdef CONFIG_SPARC_LEON
#include "ehci-grlib.c"
#define PLATFORM_DRIVER ehci_grlib_driver

128
drivers/usb/host/ehci-tegra.c
View File

@ -17,25 +17,44 @@
*/
#include <linux/clk.h>
#include <linux/clk/tegra.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/platform_data/tegra_usb.h>
#include <linux/irq.h>
#include <linux/usb/otg.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/platform_data/tegra_usb.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/usb/ehci_def.h>
#include <linux/usb/tegra_usb_phy.h>
#include <linux/clk/tegra.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/usb/otg.h>
#include "ehci.h"
#define TEGRA_USB_BASE 0xC5000000
#define TEGRA_USB2_BASE 0xC5004000
#define TEGRA_USB3_BASE 0xC5008000
#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
#define TEGRA_USB_DMA_ALIGN 32
#define DRIVER_DESC "Tegra EHCI driver"
#define DRV_NAME "tegra-ehci"
static struct hc_driver __read_mostly tegra_ehci_hc_driver;
static int (*orig_hub_control)(struct usb_hcd *hcd,
u16 typeReq, u16 wValue, u16 wIndex,
char *buf, u16 wLength);
struct tegra_ehci_hcd {
struct ehci_hcd *ehci;
struct tegra_usb_phy *phy;
@ -218,25 +237,13 @@ static int tegra_ehci_hub_control(
spin_unlock_irqrestore(&ehci->lock, flags);
/* Handle the hub control events here */
return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
return orig_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
done:
spin_unlock_irqrestore(&ehci->lock, flags);
return retval;
}
static int tegra_ehci_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
/* EHCI registers start at offset 0x100 */
ehci->caps = hcd->regs + 0x100;
/* switch to host mode */
hcd->has_tt = 1;
return ehci_setup(hcd);
}
struct dma_aligned_buffer {
void *kmalloc_ptr;
void *old_xfer_buffer;
@ -316,38 +323,6 @@ static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
free_dma_aligned_buffer(urb);
}
static const struct hc_driver tegra_ehci_hc_driver = {
.description = hcd_name,
.product_desc = "Tegra EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
.flags = HCD_USB2 | HCD_MEMORY,
/* standard ehci functions */
.irq = ehci_irq,
.start = ehci_run,
.stop = ehci_stop,
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
.get_frame_number = ehci_get_frame,
.hub_status_data = ehci_hub_status_data,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
/* modified ehci functions for tegra */
.reset = tegra_ehci_setup,
.shutdown = ehci_shutdown,
.map_urb_for_dma = tegra_ehci_map_urb_for_dma,
.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma,
.hub_control = tegra_ehci_hub_control,
#ifdef CONFIG_PM
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
#endif
};
static int setup_vbus_gpio(struct platform_device *pdev,
struct tegra_ehci_platform_data *pdata)
{
@ -444,6 +419,9 @@ static int tegra_ehci_probe(struct platform_device *pdev)
err = -ENOMEM;
goto cleanup_clk;
}
tegra->ehci = hcd_to_ehci(hcd);
hcd->has_tt = 1;
hcd->phy = u_phy;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -460,6 +438,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
err = -ENOMEM;
goto cleanup_hcd_create;
}
tegra->ehci->caps = hcd->regs + 0x100;
err = usb_phy_init(hcd->phy);
if (err) {
@ -482,8 +461,6 @@ static int tegra_ehci_probe(struct platform_device *pdev)
goto cleanup_phy;
}
tegra->ehci = hcd_to_ehci(hcd);
irq = platform_get_irq(pdev, 0);
if (!irq) {
dev_err(&pdev->dev, "Failed to get IRQ\n");
@ -558,7 +535,50 @@ static struct platform_driver tegra_ehci_driver = {
.remove = tegra_ehci_remove,
.shutdown = tegra_ehci_hcd_shutdown,
.driver = {
.name = "tegra-ehci",
.name = DRV_NAME,
.of_match_table = tegra_ehci_of_match,
}
};
static const struct ehci_driver_overrides tegra_overrides __initconst = {
.extra_priv_size = sizeof(struct tegra_ehci_hcd),
};
static int __init ehci_tegra_init(void)
{
if (usb_disabled())
return -ENODEV;
pr_info(DRV_NAME ": " DRIVER_DESC "\n");
ehci_init_driver(&tegra_ehci_hc_driver, &tegra_overrides);
/*
* The Tegra HW has some unusual quirks, which require Tegra-specific
* workarounds. We override certain hc_driver functions here to
* achieve that. We explicitly do not enhance ehci_driver_overrides to
* allow this more easily, since this is an unusual case, and we don't
* want to encourage others to override these functions by making it
* too easy.
*/
orig_hub_control = tegra_ehci_hc_driver.hub_control;
tegra_ehci_hc_driver.map_urb_for_dma = tegra_ehci_map_urb_for_dma;
tegra_ehci_hc_driver.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma;
tegra_ehci_hc_driver.hub_control = tegra_ehci_hub_control;
return platform_driver_register(&tegra_ehci_driver);
}
module_init(ehci_tegra_init);
static void __exit ehci_tegra_cleanup(void)
{
platform_driver_unregister(&tegra_ehci_driver);
}
module_exit(ehci_tegra_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra_ehci_of_match);