| /* |
| * 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)); |
| } |
| |
| /* |
| * 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 dma_addr_t xilly_map_single_pci(struct xilly_cleanup *mem, |
| struct xilly_endpoint *ep, |
| void *ptr, |
| size_t size, |
| int direction |
| ) |
| { |
| |
| dma_addr_t addr = 0; |
| struct xilly_dma *this; |
| int pci_direction; |
| |
| this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL); |
| if (!this) |
| return 0; |
| |
| pci_direction = xilly_pci_direction(direction); |
| addr = pci_map_single(ep->pdev, ptr, size, pci_direction); |
| this->direction = pci_direction; |
| |
| if (pci_dma_mapping_error(ep->pdev, addr)) { |
| kfree(this); |
| return 0; |
| } |
| |
| this->dma_addr = addr; |
| this->pdev = ep->pdev; |
| this->size = size; |
| |
| list_add_tail(&this->node, &mem->to_unmap); |
| |
| return addr; |
| } |
| |
| static void xilly_unmap_single_pci(struct xilly_dma *entry) |
| { |
| pci_unmap_single(entry->pdev, |
| entry->dma_addr, |
| entry->size, |
| entry->direction); |
| } |
| |
| 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, |
| .unmap_single = xilly_unmap_single_pci |
| }; |
| |
| static int xilly_probe(struct pci_dev *pdev, |
| const struct pci_device_id *ent) |
| { |
| struct xilly_endpoint *endpoint; |
| int rc = 0; |
| |
| endpoint = xillybus_init_endpoint(pdev, &pdev->dev, &pci_hw); |
| |
| if (!endpoint) |
| return -ENOMEM; |
| |
| pci_set_drvdata(pdev, endpoint); |
| |
| rc = pci_enable_device(pdev); |
| |
| /* L0s has caused packet drops. No power saving, thank you. */ |
| |
| pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S); |
| |
| if (rc) { |
| dev_err(endpoint->dev, |
| "pci_enable_device() failed. Aborting.\n"); |
| goto no_enable; |
| } |
| |
| if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) { |
| dev_err(endpoint->dev, |
| "Incorrect BAR configuration. Aborting.\n"); |
| rc = -ENODEV; |
| goto bad_bar; |
| } |
| |
| rc = pci_request_regions(pdev, xillyname); |
| if (rc) { |
| dev_err(endpoint->dev, |
| "pci_request_regions() failed. Aborting.\n"); |
| goto failed_request_regions; |
| } |
| |
| endpoint->registers = pci_iomap(pdev, 0, 128); |
| if (!endpoint->registers) { |
| dev_err(endpoint->dev, "Failed to map BAR 0. Aborting.\n"); |
| rc = -EIO; |
| goto failed_iomap0; |
| } |
| |
| 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"); |
| rc = -ENODEV; |
| goto failed_enable_msi; |
| } |
| rc = request_irq(pdev->irq, xillybus_isr, 0, xillyname, endpoint); |
| |
| if (rc) { |
| dev_err(endpoint->dev, |
| "Failed to register MSI handler. Aborting.\n"); |
| rc = -ENODEV; |
| goto failed_register_msi; |
| } |
| |
| /* |
| * 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"); |
| rc = -ENODEV; |
| goto failed_dmamask; |
| } |
| |
| rc = xillybus_endpoint_discovery(endpoint); |
| |
| if (!rc) |
| return 0; |
| |
| failed_dmamask: |
| free_irq(pdev->irq, endpoint); |
| failed_register_msi: |
| pci_disable_msi(pdev); |
| failed_enable_msi: |
| /* pci_clear_master(pdev); Nobody else seems to do this */ |
| pci_iounmap(pdev, endpoint->registers); |
| failed_iomap0: |
| pci_release_regions(pdev); |
| failed_request_regions: |
| bad_bar: |
| pci_disable_device(pdev); |
| no_enable: |
| xillybus_do_cleanup(&endpoint->cleanup, endpoint); |
| |
| kfree(endpoint); |
| return rc; |
| } |
| |
| static void xilly_remove(struct pci_dev *pdev) |
| { |
| struct xilly_endpoint *endpoint = pci_get_drvdata(pdev); |
| |
| xillybus_endpoint_remove(endpoint); |
| |
| free_irq(pdev->irq, endpoint); |
| |
| pci_disable_msi(pdev); |
| pci_iounmap(pdev, endpoint->registers); |
| pci_release_regions(pdev); |
| pci_disable_device(pdev); |
| |
| xillybus_do_cleanup(&endpoint->cleanup, endpoint); |
| |
| kfree(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); |