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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/misc/xillybus_pcie.c4 *5 * Copyright 2011 Xillybus Ltd, http://xillybus.com6 *7 * Driver for the Xillybus FPGA/host framework using PCI Express.8 */9 10#include <linux/module.h>11#include <linux/pci.h>12#include <linux/slab.h>13#include "xillybus.h"14 15MODULE_DESCRIPTION("Xillybus driver for PCIe");16MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");17MODULE_ALIAS("xillybus_pcie");18MODULE_LICENSE("GPL v2");19 20#define PCI_DEVICE_ID_XILLYBUS 0xebeb21 22#define PCI_VENDOR_ID_ACTEL 0x11aa23#define PCI_VENDOR_ID_LATTICE 0x120424 25static const char xillyname[] = "xillybus_pcie";26 27static const struct pci_device_id xillyids[] = {28 {PCI_DEVICE(PCI_VENDOR_ID_XILINX, PCI_DEVICE_ID_XILLYBUS)},29 {PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_XILLYBUS)},30 {PCI_DEVICE(PCI_VENDOR_ID_ACTEL, PCI_DEVICE_ID_XILLYBUS)},31 {PCI_DEVICE(PCI_VENDOR_ID_LATTICE, PCI_DEVICE_ID_XILLYBUS)},32 { /* End: all zeroes */ }33};34 35static int xilly_probe(struct pci_dev *pdev,36 const struct pci_device_id *ent)37{38 struct xilly_endpoint *endpoint;39 int rc;40 41 endpoint = xillybus_init_endpoint(&pdev->dev);42 43 if (!endpoint)44 return -ENOMEM;45 46 pci_set_drvdata(pdev, endpoint);47 48 endpoint->owner = THIS_MODULE;49 50 rc = pcim_enable_device(pdev);51 if (rc) {52 dev_err(endpoint->dev,53 "pcim_enable_device() failed. Aborting.\n");54 return rc;55 }56 57 /* L0s has caused packet drops. No power saving, thank you. */58 59 pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);60 61 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {62 dev_err(endpoint->dev,63 "Incorrect BAR configuration. Aborting.\n");64 return -ENODEV;65 }66 67 rc = pcim_iomap_regions(pdev, 0x01, xillyname);68 if (rc) {69 dev_err(endpoint->dev,70 "pcim_iomap_regions() failed. Aborting.\n");71 return rc;72 }73 74 endpoint->registers = pcim_iomap_table(pdev)[0];75 76 pci_set_master(pdev);77 78 /* Set up a single MSI interrupt */79 if (pci_enable_msi(pdev)) {80 dev_err(endpoint->dev,81 "Failed to enable MSI interrupts. Aborting.\n");82 return -ENODEV;83 }84 rc = devm_request_irq(&pdev->dev, pdev->irq, xillybus_isr, 0,85 xillyname, endpoint);86 if (rc) {87 dev_err(endpoint->dev,88 "Failed to register MSI handler. Aborting.\n");89 return -ENODEV;90 }91 92 /*93 * Some (old and buggy?) hardware drops 64-bit addressed PCIe packets,94 * even when the PCIe driver claims that a 64-bit mask is OK. On the95 * other hand, on some architectures, 64-bit addressing is mandatory.96 * So go for the 64-bit mask only when failing is the other option.97 */98 99 if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {100 endpoint->dma_using_dac = 0;101 } else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {102 endpoint->dma_using_dac = 1;103 } else {104 dev_err(endpoint->dev, "Failed to set DMA mask. Aborting.\n");105 return -ENODEV;106 }107 108 return xillybus_endpoint_discovery(endpoint);109}110 111static void xilly_remove(struct pci_dev *pdev)112{113 struct xilly_endpoint *endpoint = pci_get_drvdata(pdev);114 115 xillybus_endpoint_remove(endpoint);116}117 118MODULE_DEVICE_TABLE(pci, xillyids);119 120static struct pci_driver xillybus_driver = {121 .name = xillyname,122 .id_table = xillyids,123 .probe = xilly_probe,124 .remove = xilly_remove,125};126 127module_pci_driver(xillybus_driver);128