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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:
parent
91a687d8fe
commit
9fc5f24e43
4 changed files with 76 additions and 60 deletions
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@ -198,7 +198,7 @@ config USB_EHCI_MSM
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has an external PHY.
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config USB_EHCI_TEGRA
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boolean "NVIDIA Tegra HCD support"
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tristate "NVIDIA Tegra HCD support"
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depends on ARCH_TEGRA
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select USB_EHCI_ROOT_HUB_TT
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select USB_PHY
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@ -33,6 +33,7 @@ obj-$(CONFIG_USB_EHCI_HCD_SPEAR) += ehci-spear.o
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obj-$(CONFIG_USB_EHCI_S5P) += ehci-s5p.o
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obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
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obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
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obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
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obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
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obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
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@ -1269,11 +1269,6 @@ MODULE_LICENSE ("GPL");
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#define PLATFORM_DRIVER ehci_hcd_msp_driver
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#endif
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#ifdef CONFIG_USB_EHCI_TEGRA
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#include "ehci-tegra.c"
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#define PLATFORM_DRIVER tegra_ehci_driver
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#endif
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#ifdef CONFIG_SPARC_LEON
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#include "ehci-grlib.c"
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#define PLATFORM_DRIVER ehci_grlib_driver
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@ -17,25 +17,44 @@
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*/
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#include <linux/clk.h>
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#include <linux/clk/tegra.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/tegra_usb.h>
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#include <linux/irq.h>
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#include <linux/usb/otg.h>
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/tegra_usb.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/usb/ehci_def.h>
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#include <linux/usb/tegra_usb_phy.h>
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#include <linux/clk/tegra.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/otg.h>
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#include "ehci.h"
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#define TEGRA_USB_BASE 0xC5000000
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#define TEGRA_USB2_BASE 0xC5004000
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#define TEGRA_USB3_BASE 0xC5008000
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#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
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#define TEGRA_USB_DMA_ALIGN 32
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#define DRIVER_DESC "Tegra EHCI driver"
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#define DRV_NAME "tegra-ehci"
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static struct hc_driver __read_mostly tegra_ehci_hc_driver;
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static int (*orig_hub_control)(struct usb_hcd *hcd,
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u16 typeReq, u16 wValue, u16 wIndex,
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char *buf, u16 wLength);
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struct tegra_ehci_hcd {
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struct ehci_hcd *ehci;
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struct tegra_usb_phy *phy;
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@ -218,25 +237,13 @@ static int tegra_ehci_hub_control(
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spin_unlock_irqrestore(&ehci->lock, flags);
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/* Handle the hub control events here */
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return ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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return orig_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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done:
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spin_unlock_irqrestore(&ehci->lock, flags);
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return retval;
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}
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static int tegra_ehci_setup(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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/* EHCI registers start at offset 0x100 */
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ehci->caps = hcd->regs + 0x100;
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/* switch to host mode */
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hcd->has_tt = 1;
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return ehci_setup(hcd);
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}
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struct dma_aligned_buffer {
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void *kmalloc_ptr;
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void *old_xfer_buffer;
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@ -316,38 +323,6 @@ static void tegra_ehci_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
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free_dma_aligned_buffer(urb);
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}
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static const struct hc_driver tegra_ehci_hc_driver = {
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.description = hcd_name,
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.product_desc = "Tegra EHCI Host Controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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.flags = HCD_USB2 | HCD_MEMORY,
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/* standard ehci functions */
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.irq = ehci_irq,
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.start = ehci_run,
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.stop = ehci_stop,
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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.get_frame_number = ehci_get_frame,
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.hub_status_data = ehci_hub_status_data,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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/* modified ehci functions for tegra */
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.reset = tegra_ehci_setup,
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.shutdown = ehci_shutdown,
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.map_urb_for_dma = tegra_ehci_map_urb_for_dma,
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.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma,
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.hub_control = tegra_ehci_hub_control,
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#ifdef CONFIG_PM
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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#endif
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};
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static int setup_vbus_gpio(struct platform_device *pdev,
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struct tegra_ehci_platform_data *pdata)
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{
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@ -444,6 +419,9 @@ static int tegra_ehci_probe(struct platform_device *pdev)
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err = -ENOMEM;
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goto cleanup_clk;
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}
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tegra->ehci = hcd_to_ehci(hcd);
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hcd->has_tt = 1;
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hcd->phy = u_phy;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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@ -460,6 +438,7 @@ static int tegra_ehci_probe(struct platform_device *pdev)
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err = -ENOMEM;
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goto cleanup_hcd_create;
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}
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tegra->ehci->caps = hcd->regs + 0x100;
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err = usb_phy_init(hcd->phy);
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if (err) {
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@ -482,8 +461,6 @@ static int tegra_ehci_probe(struct platform_device *pdev)
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goto cleanup_phy;
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}
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tegra->ehci = hcd_to_ehci(hcd);
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irq = platform_get_irq(pdev, 0);
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if (!irq) {
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dev_err(&pdev->dev, "Failed to get IRQ\n");
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@ -558,7 +535,50 @@ static struct platform_driver tegra_ehci_driver = {
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.remove = tegra_ehci_remove,
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.shutdown = tegra_ehci_hcd_shutdown,
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.driver = {
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.name = "tegra-ehci",
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.name = DRV_NAME,
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.of_match_table = tegra_ehci_of_match,
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}
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};
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static const struct ehci_driver_overrides tegra_overrides __initconst = {
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.extra_priv_size = sizeof(struct tegra_ehci_hcd),
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};
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static int __init ehci_tegra_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info(DRV_NAME ": " DRIVER_DESC "\n");
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ehci_init_driver(&tegra_ehci_hc_driver, &tegra_overrides);
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/*
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* The Tegra HW has some unusual quirks, which require Tegra-specific
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* workarounds. We override certain hc_driver functions here to
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* achieve that. We explicitly do not enhance ehci_driver_overrides to
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* allow this more easily, since this is an unusual case, and we don't
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* want to encourage others to override these functions by making it
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* too easy.
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*/
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orig_hub_control = tegra_ehci_hc_driver.hub_control;
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tegra_ehci_hc_driver.map_urb_for_dma = tegra_ehci_map_urb_for_dma;
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tegra_ehci_hc_driver.unmap_urb_for_dma = tegra_ehci_unmap_urb_for_dma;
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tegra_ehci_hc_driver.hub_control = tegra_ehci_hub_control;
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return platform_driver_register(&tegra_ehci_driver);
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}
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module_init(ehci_tegra_init);
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static void __exit ehci_tegra_cleanup(void)
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{
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platform_driver_unregister(&tegra_ehci_driver);
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}
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module_exit(ehci_tegra_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DRV_NAME);
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MODULE_DEVICE_TABLE(of, tegra_ehci_of_match);
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