leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
a7e1abad13
linux/drivers/usb/cdns3/host.c

83 lines
1.7 KiB
C
Raw Normal View History

usb: cdns3: Add Cadence USB3 DRD Driver This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-08-26 11:19:30 +00:00
// SPDX-License-Identifier: GPL-2.0
/*
* Cadence USBSS DRD Driver - host side
*
* Copyright (C) 2018-2019 Cadence Design Systems.
* Copyright (C) 2017-2018 NXP
*
* Authors: Peter Chen <peter.chen@nxp.com>
* Pawel Laszczak <pawell@cadence.com>
*/
#include <linux/platform_device.h>
#include "core.h"
#include "drd.h"
usb: cdns3: include host-export,h for cdns3_host_init The cdns3_host_init() function is declared in host-export.h but host.c does not include it. Add the include to have the declaration present (and remove the declaration of cdns3_host_exit which is now static). Fixes the following sparse warning: drivers/usb/cdns3/host.c:58:5: warning: symbol 'cdns3_host_init' was not declared. Should it be static? Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-10-17 12:44:27 +00:00
#include "host-export.h"
usb: cdns3: add runtime PM support Introduce runtime PM and wakeup interrupt handler for cdns3, the runtime PM is default off since other cdns3 may not implement glue layer support for runtime PM. One typical wakeup event use case is xHCI runtime suspend will clear USBCMD.RS bit, after that the xHCI will not trigger any interrupts, so its parent (cdns core device) needs to resume xHCI device when any (wakeup) events occurs at host port. When the controller is in low power mode, the lpm flag will be set. The interrupt triggered later than lpm flag is set considers as wakeup interrupt and handled at cdns_wakeup_irq. Once the wakeup occurs, it first disables interrupt to avoid later interrupt occurrence since the controller is in low power mode at that time, and access registers may be invalid at that time. At wakeup handler, it will call pm_request_resume to wakeup xHCI device, and at runtime resume handler, it will enable interrupt again. The API platform_suspend is introduced for glue layer to implement platform specific PM sequence. Reviewed-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-09-02 09:57:32 +00:00
#include <linux/usb/hcd.h>
usb: cdns3: Add Cadence USB3 DRD Driver This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-08-26 11:19:30 +00:00
static int __cdns3_host_init(struct cdns3 *cdns)
{
struct platform_device *xhci;
int ret;
usb: cdns3: add runtime PM support Introduce runtime PM and wakeup interrupt handler for cdns3, the runtime PM is default off since other cdns3 may not implement glue layer support for runtime PM. One typical wakeup event use case is xHCI runtime suspend will clear USBCMD.RS bit, after that the xHCI will not trigger any interrupts, so its parent (cdns core device) needs to resume xHCI device when any (wakeup) events occurs at host port. When the controller is in low power mode, the lpm flag will be set. The interrupt triggered later than lpm flag is set considers as wakeup interrupt and handled at cdns_wakeup_irq. Once the wakeup occurs, it first disables interrupt to avoid later interrupt occurrence since the controller is in low power mode at that time, and access registers may be invalid at that time. At wakeup handler, it will call pm_request_resume to wakeup xHCI device, and at runtime resume handler, it will enable interrupt again. The API platform_suspend is introduced for glue layer to implement platform specific PM sequence. Reviewed-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-09-02 09:57:32 +00:00
struct usb_hcd *hcd;
usb: cdns3: Add Cadence USB3 DRD Driver This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-08-26 11:19:30 +00:00
usb: cdns3: drd: simplify *switch_gadet and *switch_host Patch split function cdns3_drd_switch_gadget and cdns3_drd_switch_host into: - cdns3_drd_host_on - cdns3_drd_host_off - cdns3_drd_gadget_on - cdns3_drd_gadgett_off These functions don't have any shared code so it's better to have smaller, faster and easier functions. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Reviewed-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-07-13 10:05:54 +00:00
cdns3_drd_host_on(cdns);
usb: cdns3: Add Cadence USB3 DRD Driver This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-08-26 11:19:30 +00:00
xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
if (!xhci) {
dev_err(cdns->dev, "couldn't allocate xHCI device\n");
return -ENOMEM;
}
xhci->dev.parent = cdns->dev;
cdns->host_dev = xhci;
ret = platform_device_add_resources(xhci, cdns->xhci_res,
CDNS3_XHCI_RESOURCES_NUM);
if (ret) {
dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
goto err1;
}
ret = platform_device_add(xhci);
if (ret) {
dev_err(cdns->dev, "failed to register xHCI device\n");
goto err1;
}
usb: cdns3: add runtime PM support Introduce runtime PM and wakeup interrupt handler for cdns3, the runtime PM is default off since other cdns3 may not implement glue layer support for runtime PM. One typical wakeup event use case is xHCI runtime suspend will clear USBCMD.RS bit, after that the xHCI will not trigger any interrupts, so its parent (cdns core device) needs to resume xHCI device when any (wakeup) events occurs at host port. When the controller is in low power mode, the lpm flag will be set. The interrupt triggered later than lpm flag is set considers as wakeup interrupt and handled at cdns_wakeup_irq. Once the wakeup occurs, it first disables interrupt to avoid later interrupt occurrence since the controller is in low power mode at that time, and access registers may be invalid at that time. At wakeup handler, it will call pm_request_resume to wakeup xHCI device, and at runtime resume handler, it will enable interrupt again. The API platform_suspend is introduced for glue layer to implement platform specific PM sequence. Reviewed-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-09-02 09:57:32 +00:00
/* Glue needs to access xHCI region register for Power management */
hcd = platform_get_drvdata(xhci);
if (hcd)
cdns->xhci_regs = hcd->regs;
usb: cdns3: Add Cadence USB3 DRD Driver This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-08-26 11:19:30 +00:00
return 0;
err1:
platform_device_put(xhci);
return ret;
}
static void cdns3_host_exit(struct cdns3 *cdns)
{
platform_device_unregister(cdns->host_dev);
cdns->host_dev = NULL;
usb: cdns3: drd: simplify *switch_gadet and *switch_host Patch split function cdns3_drd_switch_gadget and cdns3_drd_switch_host into: - cdns3_drd_host_on - cdns3_drd_host_off - cdns3_drd_gadget_on - cdns3_drd_gadgett_off These functions don't have any shared code so it's better to have smaller, faster and easier functions. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Reviewed-by: Peter Chen <peter.chen@nxp.com> Signed-off-by: Felipe Balbi <balbi@kernel.org>
2020-07-13 10:05:54 +00:00
cdns3_drd_host_off(cdns);
usb: cdns3: Add Cadence USB3 DRD Driver This patch introduce new Cadence USBSS DRD driver to Linux kernel. The Cadence USBSS DRD Controller is a highly configurable IP Core which can be instantiated as Dual-Role Device (DRD), Peripheral Only and Host Only (XHCI)configurations. The current driver has been validated with FPGA platform. We have support for PCIe bus, which is used on FPGA prototyping. The host side of USBSS-DRD controller is compliant with XHCI specification, so it works with standard XHCI Linux driver. Signed-off-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2019-08-26 11:19:30 +00:00
}
int cdns3_host_init(struct cdns3 *cdns)
{
struct cdns3_role_driver *rdrv;
rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
if (!rdrv)
return -ENOMEM;
rdrv->start = __cdns3_host_init;
rdrv->stop = cdns3_host_exit;
rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
rdrv->name = "host";
cdns->roles[USB_ROLE_HOST] = rdrv;
return 0;
}
Reference in New Issue Copy Permalink