2 * linux/drivers/misc/xillybus_pcie.c
4 * Copyright 2011 Xillybus Ltd, http://xillybus.com
6 * Driver for the Xillybus FPGA/host framework using PCI Express.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the smems of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/pci-aspm.h>
16 #include <linux/slab.h>
19 MODULE_DESCRIPTION("Xillybus driver for PCIe");
20 MODULE_AUTHOR("Eli Billauer, Xillybus Ltd.");
21 MODULE_VERSION("1.06");
22 MODULE_ALIAS("xillybus_pcie");
23 MODULE_LICENSE("GPL v2");
25 #define PCI_DEVICE_ID_XILLYBUS 0xebeb
27 #define PCI_VENDOR_ID_ALTERA 0x1172
28 #define PCI_VENDOR_ID_ACTEL 0x11aa
29 #define PCI_VENDOR_ID_LATTICE 0x1204
31 static const char xillyname[] = "xillybus_pcie";
33 static const struct pci_device_id xillyids[] = {
34 {PCI_DEVICE(PCI_VENDOR_ID_XILINX, PCI_DEVICE_ID_XILLYBUS)},
35 {PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_XILLYBUS)},
36 {PCI_DEVICE(PCI_VENDOR_ID_ACTEL, PCI_DEVICE_ID_XILLYBUS)},
37 {PCI_DEVICE(PCI_VENDOR_ID_LATTICE, PCI_DEVICE_ID_XILLYBUS)},
38 { /* End: all zeroes */ }
41 static int xilly_pci_direction(int direction)
45 return PCI_DMA_TODEVICE;
47 return PCI_DMA_FROMDEVICE;
49 return PCI_DMA_BIDIRECTIONAL;
53 static void xilly_dma_sync_single_for_cpu_pci(struct xilly_endpoint *ep,
54 dma_addr_t dma_handle,
58 pci_dma_sync_single_for_cpu(ep->pdev,
61 xilly_pci_direction(direction));
64 static void xilly_dma_sync_single_for_device_pci(struct xilly_endpoint *ep,
65 dma_addr_t dma_handle,
69 pci_dma_sync_single_for_device(ep->pdev,
72 xilly_pci_direction(direction));
76 * Map either through the PCI DMA mapper or the non_PCI one. Behind the
77 * scenes exactly the same functions are called with the same parameters,
78 * but that can change.
81 static dma_addr_t xilly_map_single_pci(struct xilly_cleanup *mem,
82 struct xilly_endpoint *ep,
90 struct xilly_dma *this;
93 this = kmalloc(sizeof(struct xilly_dma), GFP_KERNEL);
97 pci_direction = xilly_pci_direction(direction);
98 addr = pci_map_single(ep->pdev, ptr, size, pci_direction);
99 this->direction = pci_direction;
101 if (pci_dma_mapping_error(ep->pdev, addr)) {
106 this->dma_addr = addr;
107 this->pdev = ep->pdev;
110 list_add_tail(&this->node, &mem->to_unmap);
115 static void xilly_unmap_single_pci(struct xilly_dma *entry)
117 pci_unmap_single(entry->pdev,
123 static struct xilly_endpoint_hardware pci_hw = {
124 .owner = THIS_MODULE,
125 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_pci,
126 .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_pci,
127 .map_single = xilly_map_single_pci,
128 .unmap_single = xilly_unmap_single_pci
131 static int xilly_probe(struct pci_dev *pdev,
132 const struct pci_device_id *ent)
134 struct xilly_endpoint *endpoint;
137 endpoint = xillybus_init_endpoint(pdev, &pdev->dev, &pci_hw);
142 pci_set_drvdata(pdev, endpoint);
144 rc = pci_enable_device(pdev);
146 /* L0s has caused packet drops. No power saving, thank you. */
148 pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
151 dev_err(endpoint->dev,
152 "pci_enable_device() failed. Aborting.\n");
156 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
157 dev_err(endpoint->dev,
158 "Incorrect BAR configuration. Aborting.\n");
163 rc = pci_request_regions(pdev, xillyname);
165 dev_err(endpoint->dev,
166 "pci_request_regions() failed. Aborting.\n");
167 goto failed_request_regions;
170 endpoint->registers = pci_iomap(pdev, 0, 128);
172 if (!endpoint->registers) {
173 dev_err(endpoint->dev, "Failed to map BAR 0. Aborting.\n");
177 pci_set_master(pdev);
179 /* Set up a single MSI interrupt */
180 if (pci_enable_msi(pdev)) {
181 dev_err(endpoint->dev,
182 "Failed to enable MSI interrupts. Aborting.\n");
184 goto failed_enable_msi;
186 rc = request_irq(pdev->irq, xillybus_isr, 0, xillyname, endpoint);
189 dev_err(endpoint->dev,
190 "Failed to register MSI handler. Aborting.\n");
192 goto failed_register_msi;
196 * In theory, an attempt to set the DMA mask to 64 and dma_using_dac=1
197 * is the right thing. But some unclever PCIe drivers report it's OK
198 * when the hardware drops those 64-bit PCIe packets. So trust
199 * nobody and use 32 bits DMA addressing in any case.
202 if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))
203 endpoint->dma_using_dac = 0;
205 dev_err(endpoint->dev, "Failed to set DMA mask. Aborting.\n");
210 rc = xillybus_endpoint_discovery(endpoint);
216 free_irq(pdev->irq, endpoint);
218 pci_disable_msi(pdev);
220 /* pci_clear_master(pdev); Nobody else seems to do this */
221 pci_iounmap(pdev, endpoint->registers);
223 pci_release_regions(pdev);
224 failed_request_regions:
226 pci_disable_device(pdev);
228 xillybus_do_cleanup(&endpoint->cleanup, endpoint);
234 static void xilly_remove(struct pci_dev *pdev)
236 struct xilly_endpoint *endpoint = pci_get_drvdata(pdev);
238 xillybus_endpoint_remove(endpoint);
240 free_irq(pdev->irq, endpoint);
242 pci_disable_msi(pdev);
243 pci_iounmap(pdev, endpoint->registers);
244 pci_release_regions(pdev);
245 pci_disable_device(pdev);
247 xillybus_do_cleanup(&endpoint->cleanup, endpoint);
252 MODULE_DEVICE_TABLE(pci, xillyids);
254 static struct pci_driver xillybus_driver = {
256 .id_table = xillyids,
257 .probe = xilly_probe,
258 .remove = xilly_remove,
261 module_pci_driver(xillybus_driver);