diff options
Diffstat (limited to 'drivers/char/xillybus/xillybus_pcie.c')
| -rw-r--r-- | drivers/char/xillybus/xillybus_pcie.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/char/xillybus/xillybus_pcie.c b/drivers/char/xillybus/xillybus_pcie.c new file mode 100644 index 000000000..9858711e3 --- /dev/null +++ b/drivers/char/xillybus/xillybus_pcie.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/misc/xillybus_pcie.c + * + * Copyright 2011 Xillybus Ltd, http://xillybus.com + * + * Driver for the Xillybus FPGA/host framework using PCI Express. + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include "xillybus.h" + +MODULE_DESCRIPTION("Xillybus driver for PCIe"); +MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); +MODULE_ALIAS("xillybus_pcie"); +MODULE_LICENSE("GPL v2"); + +#define PCI_DEVICE_ID_XILLYBUS 0xebeb + +#define PCI_VENDOR_ID_ACTEL 0x11aa +#define PCI_VENDOR_ID_LATTICE 0x1204 + +static const char xillyname[] = "xillybus_pcie"; + +static const struct pci_device_id xillyids[] = { + {PCI_DEVICE(PCI_VENDOR_ID_XILINX, PCI_DEVICE_ID_XILLYBUS)}, + {PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_XILLYBUS)}, + {PCI_DEVICE(PCI_VENDOR_ID_ACTEL, PCI_DEVICE_ID_XILLYBUS)}, + {PCI_DEVICE(PCI_VENDOR_ID_LATTICE, PCI_DEVICE_ID_XILLYBUS)}, + { /* End: all zeroes */ } +}; + +static int xilly_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct xilly_endpoint *endpoint; + int rc; + + endpoint = xillybus_init_endpoint(&pdev->dev); + + if (!endpoint) + return -ENOMEM; + + pci_set_drvdata(pdev, endpoint); + + endpoint->owner = THIS_MODULE; + + rc = pcim_enable_device(pdev); + if (rc) { + dev_err(endpoint->dev, + "pcim_enable_device() failed. Aborting.\n"); + return rc; + } + + /* L0s has caused packet drops. No power saving, thank you. */ + + pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S); + + if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) { + dev_err(endpoint->dev, + "Incorrect BAR configuration. Aborting.\n"); + return -ENODEV; + } + + rc = pcim_iomap_regions(pdev, 0x01, xillyname); + if (rc) { + dev_err(endpoint->dev, + "pcim_iomap_regions() failed. Aborting.\n"); + return rc; + } + + endpoint->registers = pcim_iomap_table(pdev)[0]; + + pci_set_master(pdev); + + /* Set up a single MSI interrupt */ + if (pci_enable_msi(pdev)) { + dev_err(endpoint->dev, + "Failed to enable MSI interrupts. Aborting.\n"); + return -ENODEV; + } + rc = devm_request_irq(&pdev->dev, pdev->irq, xillybus_isr, 0, + xillyname, endpoint); + if (rc) { + dev_err(endpoint->dev, + "Failed to register MSI handler. Aborting.\n"); + return -ENODEV; + } + + /* + * Some (old and buggy?) hardware drops 64-bit addressed PCIe packets, + * even when the PCIe driver claims that a 64-bit mask is OK. On the + * other hand, on some architectures, 64-bit addressing is mandatory. + * So go for the 64-bit mask only when failing is the other option. + */ + + if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) { + endpoint->dma_using_dac = 0; + } else if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) { + endpoint->dma_using_dac = 1; + } else { + dev_err(endpoint->dev, "Failed to set DMA mask. Aborting.\n"); + return -ENODEV; + } + + return xillybus_endpoint_discovery(endpoint); +} + +static void xilly_remove(struct pci_dev *pdev) +{ + struct xilly_endpoint *endpoint = pci_get_drvdata(pdev); + + xillybus_endpoint_remove(endpoint); +} + +MODULE_DEVICE_TABLE(pci, xillyids); + +static struct pci_driver xillybus_driver = { + .name = xillyname, + .id_table = xillyids, + .probe = xilly_probe, + .remove = xilly_remove, +}; + +module_pci_driver(xillybus_driver); |