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 * Some (old and buggy?) hardware drops 64-bit addressed PCIe packets,
197 * even when the PCIe driver claims that a 64-bit mask is OK. On the
198 * other hand, on some architectures, 64-bit addressing is mandatory.
199 * So go for the 64-bit mask only when failing is the other option.
202 if (!pci_set_dma_mask(pdev
, DMA_BIT_MASK(32))) {
203 endpoint
->dma_using_dac
= 0;
204 } else if (!pci_set_dma_mask(pdev
, DMA_BIT_MASK(64))) {
205 endpoint
->dma_using_dac
= 1;
207 dev_err(endpoint
->dev
, "Failed to set DMA mask. Aborting.\n");
211 return xillybus_endpoint_discovery(endpoint
);
214 static void xilly_remove(struct pci_dev
*pdev
)
216 struct xilly_endpoint
*endpoint
= pci_get_drvdata(pdev
);
218 xillybus_endpoint_remove(endpoint
);
221 MODULE_DEVICE_TABLE(pci
, xillyids
);
223 static struct pci_driver xillybus_driver
= {
225 .id_table
= xillyids
,
226 .probe
= xilly_probe
,
227 .remove
= xilly_remove
,
230 module_pci_driver(xillybus_driver
);