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));
75 static void xilly_pci_unmap(void *ptr)
77 struct xilly_mapping *data = ptr;
79 pci_unmap_single(data->device, data->dma_addr,
80 data->size, data->direction);
86 * Map either through the PCI DMA mapper or the non_PCI one. Behind the
87 * scenes exactly the same functions are called with the same parameters,
88 * but that can change.
91 static int xilly_map_single_pci(struct xilly_endpoint *ep,
95 dma_addr_t *ret_dma_handle
100 struct xilly_mapping *this;
103 this = kzalloc(sizeof(*this), GFP_KERNEL);
107 pci_direction = xilly_pci_direction(direction);
109 addr = pci_map_single(ep->pdev, ptr, size, pci_direction);
111 if (pci_dma_mapping_error(ep->pdev, addr)) {
116 this->device = ep->pdev;
117 this->dma_addr = addr;
119 this->direction = pci_direction;
121 *ret_dma_handle = addr;
123 rc = devm_add_action(ep->dev, xilly_pci_unmap, this);
125 pci_unmap_single(ep->pdev, addr, size, pci_direction);
133 static struct xilly_endpoint_hardware pci_hw = {
134 .owner = THIS_MODULE,
135 .hw_sync_sgl_for_cpu = xilly_dma_sync_single_for_cpu_pci,
136 .hw_sync_sgl_for_device = xilly_dma_sync_single_for_device_pci,
137 .map_single = xilly_map_single_pci,
140 static int xilly_probe(struct pci_dev *pdev,
141 const struct pci_device_id *ent)
143 struct xilly_endpoint *endpoint;
146 endpoint = xillybus_init_endpoint(pdev, &pdev->dev, &pci_hw);
151 pci_set_drvdata(pdev, endpoint);
153 rc = pcim_enable_device(pdev);
155 dev_err(endpoint->dev,
156 "pcim_enable_device() failed. Aborting.\n");
160 /* L0s has caused packet drops. No power saving, thank you. */
162 pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S);
164 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
165 dev_err(endpoint->dev,
166 "Incorrect BAR configuration. Aborting.\n");
170 rc = pcim_iomap_regions(pdev, 0x01, xillyname);
172 dev_err(endpoint->dev,
173 "pcim_iomap_regions() failed. Aborting.\n");
177 endpoint->registers = pcim_iomap_table(pdev)[0];
179 pci_set_master(pdev);
181 /* Set up a single MSI interrupt */
182 if (pci_enable_msi(pdev)) {
183 dev_err(endpoint->dev,
184 "Failed to enable MSI interrupts. Aborting.\n");
187 rc = devm_request_irq(&pdev->dev, pdev->irq, xillybus_isr, 0,
188 xillyname, endpoint);
190 dev_err(endpoint->dev,
191 "Failed to register MSI handler. Aborting.\n");
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");
209 return xillybus_endpoint_discovery(endpoint);
212 static void xilly_remove(struct pci_dev *pdev)
214 struct xilly_endpoint *endpoint = pci_get_drvdata(pdev);
216 xillybus_endpoint_remove(endpoint);
219 MODULE_DEVICE_TABLE(pci, xillyids);
221 static struct pci_driver xillybus_driver = {
223 .id_table = xillyids,
224 .probe = xilly_probe,
225 .remove = xilly_remove,
228 module_pci_driver(xillybus_driver);