diff options
Diffstat (limited to 'kernel/drivers/char/xillybus/xillybus_pcie.c')
| -rw-r--r-- | kernel/drivers/char/xillybus/xillybus_pcie.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/kernel/drivers/char/xillybus/xillybus_pcie.c b/kernel/drivers/char/xillybus/xillybus_pcie.c new file mode 100644 index 000000000..d8266bc2a --- /dev/null +++ b/kernel/drivers/char/xillybus/xillybus_pcie.c @@ -0,0 +1,228 @@ +/* + * 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); |