/* * linux/drivers/misc/xillybus_pcie.c * * Copyright 2011 Xillybus Ltd, http://xillybus.com * * Driver for the Xillybus FPGA/host framework using PCI Express. * * This program is free software; you can redistribute it and/or modify * it under the smems of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. */ #include <linux/module.h> #include <linux/pci.h> #include <linux/pci-aspm.h> #include <linux/slab.h> #include "xillybus.h" MODULE_DESCRIPTION("Xillybus driver for PCIe"); MODULE_AUTHOR("Eli Billauer, Xillybus Ltd."); MODULE_VERSION("1.06"); MODULE_ALIAS("xillybus_pcie"); MODULE_LICENSE("GPL v2"); #define PCI_DEVICE_ID_XILLYBUS 0xebeb #define PCI_VENDOR_ID_ALTERA 0x1172 #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_pci_direction(int direction) { switch (direction) { case DMA_TO_DEVICE: return PCI_DMA_TODEVICE; case DMA_FROM_DEVICE: return PCI_DMA_FROMDEVICE; default: return PCI_DMA_BIDIRECTIONAL; } } static void xilly_dma_sync_single_for_cpu_pci(struct xilly_endpoint *ep, dma_addr_t dma_handle, size_t size, int direction) { pci_dma_sync_single_for_cpu(ep->pdev, dma_handle, size, xilly_pci_direction(direction)); } static void xilly_dma_sync_single_for_device_pci(struct xilly_endpoint *ep, dma_addr_t dma_handle, size_t size, int direction) { pci_dma_sync_single_for_device(ep->pdev, dma_handle, size, xilly_pci_direction(direction)); } static void xilly_pci_unmap(void *ptr) { struct xilly_mapping *data = ptr; pci_unmap_single(data->device, data->dma_addr, data->size, data->direction); kfree(ptr); } /* * Map either through the PCI DMA mapper or the non_PCI one. Behind the * scenes exactly the same functions are called with the same parameters, * but that can change. */ static int xilly_map_single_pci(struct xilly_endpoint *ep, void *ptr, size_t size, int direction, dma_addr_t *ret_dma_handle ) { int pci_direction; dma_addr_t addr; struct xilly_mapping *this; int rc; this = kzalloc(sizeof(*this), GFP_KERNEL); if (!this) return -ENOMEM; pci_direction = xilly_pci_direction(direction); addr = pci_map_single(ep->pdev, ptr, size, pci_direction); if (pci_dma_mapping_error(ep->pdev, addr)) { kfree(this); return -ENODEV; } this->device = ep->pdev; this->dma_addr = addr; this->size = size; this->direction = pci_direction; *ret_dma_handle = addr; rc = devm_add_action(ep->dev, xilly_pci_unmap, this); if (rc) { pci_unmap_single(ep->pdev, addr, size, pci_direction); kfree(this); return rc; } return 0; } static struct xilly_endpoint_hardware pci_hw = { .owner = THIS_MODULE, .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_pci, .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_pci, .map_single = xilly_map_single_pci, }; 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, &pdev->dev, &pci_hw); if (!endpoint) return -ENOMEM; pci_set_drvdata(pdev, endpoint); 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; } /* * In theory, an attempt to set the DMA mask to 64 and dma_using_dac=1 * is the right thing. But some unclever PCIe drivers report it's OK * when the hardware drops those 64-bit PCIe packets. So trust * nobody and use 32 bits DMA addressing in any case. */ if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) { endpoint->dma_using_dac = 0; } 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);