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2319b9c87f
The device may be scheduled during the resume process, so this cannot appear in atomic operations. Since pm_runtime_set_active will resume suppliers, put set active outside the spin lock, which is only used to protect the struct cdns data structure, otherwise the kernel will report the following warning: BUG: sleeping function called from invalid context at drivers/base/power/runtime.c:1163 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 651, name: sh preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 CPU: 0 PID: 651 Comm: sh Tainted: G WC 6.1.20 #1 Hardware name: Freescale i.MX8QM MEK (DT) Call trace: dump_backtrace.part.0+0xe0/0xf0 show_stack+0x18/0x30 dump_stack_lvl+0x64/0x80 dump_stack+0x1c/0x38 __might_resched+0x1fc/0x240 __might_sleep+0x68/0xc0 __pm_runtime_resume+0x9c/0xe0 rpm_get_suppliers+0x68/0x1b0 __pm_runtime_set_status+0x298/0x560 cdns_resume+0xb0/0x1c0 cdns3_controller_resume.isra.0+0x1e0/0x250 cdns3_plat_resume+0x28/0x40 Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com> Acked-by: Peter Chen <peter.chen@kernel.org> Link: https://lore.kernel.org/r/20230616021952.1025854-1-xiaolei.wang@windriver.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
249 lines
5.6 KiB
C
249 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Cadence PCI Glue driver.
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*
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* Copyright (C) 2019 Cadence.
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*
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* Author: Pawel Laszczak <pawell@cadence.com>
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*
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*/
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include "core.h"
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#include "gadget-export.h"
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#define PCI_BAR_HOST 0
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#define PCI_BAR_OTG 0
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#define PCI_BAR_DEV 2
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#define PCI_DEV_FN_HOST_DEVICE 0
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#define PCI_DEV_FN_OTG 1
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#define PCI_DRIVER_NAME "cdns-pci-usbssp"
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#define PLAT_DRIVER_NAME "cdns-usbssp"
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#define CDNS_VENDOR_ID 0x17cd
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#define CDNS_DEVICE_ID 0x0200
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#define CDNS_DRD_ID 0x0100
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#define CDNS_DRD_IF (PCI_CLASS_SERIAL_USB << 8 | 0x80)
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static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev)
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{
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/*
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* Gets the second function.
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* Platform has two function. The fist keeps resources for
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* Host/Device while the secon keeps resources for DRD/OTG.
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*/
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if (pdev->device == CDNS_DEVICE_ID)
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return pci_get_device(pdev->vendor, CDNS_DRD_ID, NULL);
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else if (pdev->device == CDNS_DRD_ID)
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return pci_get_device(pdev->vendor, CDNS_DEVICE_ID, NULL);
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return NULL;
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}
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static int cdnsp_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct device *dev = &pdev->dev;
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struct pci_dev *func;
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struct resource *res;
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struct cdns *cdnsp;
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int ret;
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/*
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* For GADGET/HOST PCI (devfn) function number is 0,
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* for OTG PCI (devfn) function number is 1.
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*/
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if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE &&
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pdev->devfn != PCI_DEV_FN_OTG))
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return -EINVAL;
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func = cdnsp_get_second_fun(pdev);
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if (!func)
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return -EINVAL;
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if (func->class == PCI_CLASS_SERIAL_USB_XHCI ||
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pdev->class == PCI_CLASS_SERIAL_USB_XHCI) {
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ret = -EINVAL;
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goto put_pci;
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}
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ret = pcim_enable_device(pdev);
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if (ret) {
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dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret);
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goto put_pci;
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}
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pci_set_master(pdev);
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if (pci_is_enabled(func)) {
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cdnsp = pci_get_drvdata(func);
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} else {
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cdnsp = kzalloc(sizeof(*cdnsp), GFP_KERNEL);
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if (!cdnsp) {
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ret = -ENOMEM;
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goto disable_pci;
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}
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}
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/* For GADGET device function number is 0. */
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if (pdev->devfn == 0) {
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resource_size_t rsrc_start, rsrc_len;
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/* Function 0: host(BAR_0) + device(BAR_1).*/
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dev_dbg(dev, "Initialize resources\n");
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rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV);
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rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV);
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res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev");
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if (!res) {
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dev_dbg(dev, "controller already in use\n");
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ret = -EBUSY;
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goto free_cdnsp;
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}
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cdnsp->dev_regs = devm_ioremap(dev, rsrc_start, rsrc_len);
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if (!cdnsp->dev_regs) {
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dev_dbg(dev, "error mapping memory\n");
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ret = -EFAULT;
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goto free_cdnsp;
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}
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cdnsp->dev_irq = pdev->irq;
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dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n",
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&rsrc_start);
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res = &cdnsp->xhci_res[0];
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res->start = pci_resource_start(pdev, PCI_BAR_HOST);
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res->end = pci_resource_end(pdev, PCI_BAR_HOST);
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res->name = "xhci";
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res->flags = IORESOURCE_MEM;
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dev_dbg(dev, "USBSS-XHCI physical base addr: %pa\n",
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&res->start);
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/* Interrupt for XHCI, */
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res = &cdnsp->xhci_res[1];
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res->start = pdev->irq;
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res->name = "host";
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res->flags = IORESOURCE_IRQ;
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} else {
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res = &cdnsp->otg_res;
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res->start = pci_resource_start(pdev, PCI_BAR_OTG);
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res->end = pci_resource_end(pdev, PCI_BAR_OTG);
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res->name = "otg";
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res->flags = IORESOURCE_MEM;
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dev_dbg(dev, "CDNSP-DRD physical base addr: %pa\n",
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&res->start);
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/* Interrupt for OTG/DRD. */
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cdnsp->otg_irq = pdev->irq;
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}
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if (pci_is_enabled(func)) {
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cdnsp->dev = dev;
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cdnsp->gadget_init = cdnsp_gadget_init;
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ret = cdns_init(cdnsp);
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if (ret)
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goto free_cdnsp;
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}
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pci_set_drvdata(pdev, cdnsp);
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device_wakeup_enable(&pdev->dev);
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if (pci_dev_run_wake(pdev))
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pm_runtime_put_noidle(&pdev->dev);
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return 0;
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free_cdnsp:
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if (!pci_is_enabled(func))
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kfree(cdnsp);
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disable_pci:
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pci_disable_device(pdev);
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put_pci:
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pci_dev_put(func);
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return ret;
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}
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static void cdnsp_pci_remove(struct pci_dev *pdev)
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{
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struct cdns *cdnsp;
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struct pci_dev *func;
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func = cdnsp_get_second_fun(pdev);
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cdnsp = (struct cdns *)pci_get_drvdata(pdev);
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if (pci_dev_run_wake(pdev))
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pm_runtime_get_noresume(&pdev->dev);
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if (pci_is_enabled(func)) {
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cdns_remove(cdnsp);
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} else {
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kfree(cdnsp);
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}
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pci_dev_put(func);
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}
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static int __maybe_unused cdnsp_pci_suspend(struct device *dev)
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{
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struct cdns *cdns = dev_get_drvdata(dev);
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return cdns_suspend(cdns);
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}
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static int __maybe_unused cdnsp_pci_resume(struct device *dev)
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{
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struct cdns *cdns = dev_get_drvdata(dev);
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&cdns->lock, flags);
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ret = cdns_resume(cdns);
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spin_unlock_irqrestore(&cdns->lock, flags);
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cdns_set_active(cdns, 1);
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return ret;
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}
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static const struct dev_pm_ops cdnsp_pci_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(cdnsp_pci_suspend, cdnsp_pci_resume)
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};
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static const struct pci_device_id cdnsp_pci_ids[] = {
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{ PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
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PCI_CLASS_SERIAL_USB_DEVICE, PCI_ANY_ID },
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{ PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
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CDNS_DRD_IF, PCI_ANY_ID },
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{ PCI_VENDOR_ID_CDNS, CDNS_DRD_ID, PCI_ANY_ID, PCI_ANY_ID,
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CDNS_DRD_IF, PCI_ANY_ID },
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{ 0, }
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};
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static struct pci_driver cdnsp_pci_driver = {
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.name = "cdnsp-pci",
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.id_table = &cdnsp_pci_ids[0],
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.probe = cdnsp_pci_probe,
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.remove = cdnsp_pci_remove,
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.driver = {
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.pm = &cdnsp_pci_pm_ops,
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}
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};
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module_pci_driver(cdnsp_pci_driver);
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MODULE_DEVICE_TABLE(pci, cdnsp_pci_ids);
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MODULE_ALIAS("pci:cdnsp");
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MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Cadence CDNSP PCI driver");
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