usb: host: mips: sead3: USB Host controller support for SEAD-3 platform. (c256667f) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/usb/host/Kconfig

+3 −2

Original line number	Diff line number	Diff line
		@@ -110,13 +110,14 @@ config USB_EHCI_BIG_ENDIAN_MMIO
		depends on USB_EHCI_HCD && (PPC_CELLEB \|\| PPC_PS3 \|\| 440EPX \|\| \
		ARCH_IXP4XX \|\| XPS_USB_HCD_XILINX \|\| \
		PPC_MPC512x \|\| CPU_CAVIUM_OCTEON \|\| \
		PMC_MSP \|\| SPARC_LEON)
		PMC_MSP \|\| SPARC_LEON \|\| MIPS_SEAD3)
		default y

		config USB_EHCI_BIG_ENDIAN_DESC
		bool
		depends on USB_EHCI_HCD && (440EPX \|\| ARCH_IXP4XX \|\| XPS_USB_HCD_XILINX \|\| \
		PPC_MPC512x \|\| PMC_MSP \|\| SPARC_LEON)
		PPC_MPC512x \|\| PMC_MSP \|\| SPARC_LEON \|\| \
		MIPS_SEAD3)
		default y

		config XPS_USB_HCD_XILINX

drivers/usb/host/ehci-hcd.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -1364,6 +1364,11 @@ MODULE_LICENSE ("GPL");
		#define PLATFORM_DRIVER ehci_ls1x_driver
		#endif

		#ifdef CONFIG_MIPS_SEAD3
		#include "ehci-sead3.c"
		#define PLATFORM_DRIVER ehci_hcd_sead3_driver
		#endif

		#ifdef CONFIG_USB_EHCI_HCD_PLATFORM
		#include "ehci-platform.c"
		#define PLATFORM_DRIVER ehci_platform_driver

drivers/usb/host/ehci-sead3.c

0 → 100644

+266 −0

Original line number	Diff line number	Diff line
		/*
		* MIPS CI13320A EHCI Host Controller driver
		* Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
		*
		* Copyright (C) 2012 MIPS Technologies, Inc.
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License as published by the
		* Free Software Foundation; either version 2 of the License, or (at your
		* option) any later version.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
		* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
		* for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software Foundation,
		* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
		*/

		#include <linux/platform_device.h>

		static int ehci_sead3_setup(struct usb_hcd *hcd)
		{
		int ret;
		struct ehci_hcd *ehci = hcd_to_ehci(hcd);

		ehci->caps = hcd->regs + 0x100;

		ret = ehci_setup(hcd);
		if (ret)
		return ret;

		ehci->need_io_watchdog = 0;

		#ifdef __BIG_ENDIAN
		ehci->big_endian_mmio = 1;
		ehci->big_endian_desc = 1;
		#endif

		/* Set burst length to 16 words. */
		ehci_writel(ehci, 0x1010, &ehci->regs->reserved[1]);

		return ret;
		}

		const struct hc_driver ehci_sead3_hc_driver = {
		.description = hcd_name,
		.product_desc = "SEAD-3 EHCI",
		.hcd_priv_size = sizeof(struct ehci_hcd),

		/*
		* generic hardware linkage
		*/
		.irq = ehci_irq,
		.flags = HCD_MEMORY \| HCD_USB2,

		/*
		* basic lifecycle operations
		*
		*/
		.reset = ehci_sead3_setup,
		.start = ehci_run,
		.stop = ehci_stop,
		.shutdown = ehci_shutdown,

		/*
		* managing i/o requests and associated device resources
		*/
		.urb_enqueue = ehci_urb_enqueue,
		.urb_dequeue = ehci_urb_dequeue,
		.endpoint_disable = ehci_endpoint_disable,
		.endpoint_reset = ehci_endpoint_reset,

		/*
		* scheduling support
		*/
		.get_frame_number = ehci_get_frame,

		/*
		* root hub support
		*/
		.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 int ehci_hcd_sead3_drv_probe(struct platform_device *pdev)
		{
		struct usb_hcd *hcd;
		struct resource *res;
		int ret;

		if (usb_disabled())
		return -ENODEV;

		if (pdev->resource[1].flags != IORESOURCE_IRQ) {
		pr_debug("resource[1] is not IORESOURCE_IRQ");
		return -ENOMEM;
		}
		hcd = usb_create_hcd(&ehci_sead3_hc_driver, &pdev->dev, "SEAD-3");
		if (!hcd)
		return -ENOMEM;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		hcd->rsrc_start = res->start;
		hcd->rsrc_len = resource_size(res);

		if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		pr_debug("request_mem_region failed");
		ret = -EBUSY;
		goto err1;
		}

		hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
		if (!hcd->regs) {
		pr_debug("ioremap failed");
		ret = -ENOMEM;
		goto err2;
		}

		/* Root hub has integrated TT. */
		hcd->has_tt = 1;

		ret = usb_add_hcd(hcd, pdev->resource[1].start,
		IRQF_SHARED);
		if (ret == 0) {
		platform_set_drvdata(pdev, hcd);
		return ret;
		}

		iounmap(hcd->regs);
		err2:
		release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
		err1:
		usb_put_hcd(hcd);
		return ret;
		}

		static int ehci_hcd_sead3_drv_remove(struct platform_device *pdev)
		{
		struct usb_hcd *hcd = platform_get_drvdata(pdev);

		usb_remove_hcd(hcd);
		iounmap(hcd->regs);
		release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
		usb_put_hcd(hcd);
		platform_set_drvdata(pdev, NULL);

		return 0;
		}

		#ifdef CONFIG_PM
		static int ehci_hcd_sead3_drv_suspend(struct device *dev)
		{
		struct usb_hcd *hcd = dev_get_drvdata(dev);
		struct ehci_hcd *ehci = hcd_to_ehci(hcd);
		unsigned long flags;
		int rc = 0;

		if (time_before(jiffies, ehci->next_statechange))
		msleep(20);

		/* Root hub was already suspended. Disable irq emission and
		* mark HW unaccessible. The PM and USB cores make sure that
		* the root hub is either suspended or stopped.
		*/
		ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
		spin_lock_irqsave(&ehci->lock, flags);
		ehci_writel(ehci, 0, &ehci->regs->intr_enable);
		(void)ehci_readl(ehci, &ehci->regs->intr_enable);

		clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
		spin_unlock_irqrestore(&ehci->lock, flags);

		/* could save FLADJ in case of Vaux power loss
		* ... we'd only use it to handle clock skew
		*/

		return rc;
		}

		static int ehci_hcd_sead3_drv_resume(struct device *dev)
		{
		struct usb_hcd *hcd = dev_get_drvdata(dev);
		struct ehci_hcd *ehci = hcd_to_ehci(hcd);

		/* maybe restore FLADJ. */

		if (time_before(jiffies, ehci->next_statechange))
		msleep(100);

		/* Mark hardware accessible again as we are out of D3 state by now */
		set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

		/* If CF is still set, we maintained PCI Vaux power.
		* Just undo the effect of ehci_pci_suspend().
		*/
		if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
		int mask = INTR_MASK;

		ehci_prepare_ports_for_controller_resume(ehci);
		if (!hcd->self.root_hub->do_remote_wakeup)
		mask &= ~STS_PCD;
		ehci_writel(ehci, mask, &ehci->regs->intr_enable);
		ehci_readl(ehci, &ehci->regs->intr_enable);
		return 0;
		}

		ehci_dbg(ehci, "lost power, restarting\n");
		usb_root_hub_lost_power(hcd->self.root_hub);

		/* Else reset, to cope with power loss or flush-to-storage
		* style "resume" having let BIOS kick in during reboot.
		*/
		(void) ehci_halt(ehci);
		(void) ehci_reset(ehci);

		/* emptying the schedule aborts any urbs */
		spin_lock_irq(&ehci->lock);
		if (ehci->reclaim)
		end_unlink_async(ehci);
		ehci_work(ehci);
		spin_unlock_irq(&ehci->lock);

		ehci_writel(ehci, ehci->command, &ehci->regs->command);
		ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
		ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */

		/* here we "know" root ports should always stay powered */
		ehci_port_power(ehci, 1);

		ehci->rh_state = EHCI_RH_SUSPENDED;

		return 0;
		}

		static const struct dev_pm_ops sead3_ehci_pmops = {
		.suspend = ehci_hcd_sead3_drv_suspend,
		.resume = ehci_hcd_sead3_drv_resume,
		};

		#define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops)

		#else
		#define SEAD3_EHCI_PMOPS NULL
		#endif

		static struct platform_driver ehci_hcd_sead3_driver = {
		.probe = ehci_hcd_sead3_drv_probe,
		.remove = ehci_hcd_sead3_drv_remove,
		.shutdown = usb_hcd_platform_shutdown,
		.driver = {
		.name = "sead3-ehci",
		.owner = THIS_MODULE,
		.pm = SEAD3_EHCI_PMOPS,
		}
		};

		MODULE_ALIAS("platform:sead3-ehci");