2 * Copyright (c) 2014-2016 François Tigeot
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #define PCI_ANY_ID (~0u)
32 #include <sys/param.h>
34 #include <sys/pciio.h>
36 #include <bus/pci/pcivar.h>
37 #include <bus/pci/pcireg.h>
39 #include <linux/types.h>
40 #include <linux/list.h>
41 #include <linux/compiler.h>
42 #include <linux/errno.h>
43 #include <linux/atomic.h>
44 #include <linux/device.h>
47 #include <linux/pci_ids.h>
51 struct pci_device_id
{
58 unsigned long driver_data
;
62 struct pci_bus
*bus
; /* bus device is nailed to */
63 struct device
*dev
; /* NOTE the star */
65 unsigned short vendor
; /* vendor ID */
66 unsigned short device
; /* device ID */
67 unsigned short subsystem_vendor
;
68 unsigned short subsystem_device
;
76 struct pci_dev
*self
; /* handle to pdev self */
77 struct device
*dev
; /* handle to dev */
79 unsigned char number
; /* bus addr number */
82 #define PCI_DEVFN(slot, func) ((((slot) & 0x1f) << 3) | ((func) & 0x07))
84 #define PCI_DMA_BIDIRECTIONAL 0
86 /* extracted from radeon/si.c radeon/cik.c */
87 #define PCI_EXP_LNKCTL PCIER_LINKCTRL /* 16 */
88 #define PCI_EXP_LNKCTL2 48
89 #define PCI_EXP_LNKCTL_HAWD PCIEM_LNKCTL_HAWD /* 0x0200 */
90 #define PCI_EXP_DEVSTA PCIER_DEVSTS /* 10 */
91 #define PCI_EXP_DEVSTA_TRPND 0x0020
92 #define PCI_EXP_LNKCAP_CLKPM 0x00040000
95 pci_read_config_byte(struct pci_dev
*pdev
, int where
, u8
*val
)
97 *val
= (u16
)pci_read_config(pdev
->dev
, where
, 1);
102 pci_read_config_word(struct pci_dev
*pdev
, int where
, u16
*val
)
104 *val
= (u16
)pci_read_config(pdev
->dev
, where
, 2);
109 pci_read_config_dword(struct pci_dev
*pdev
, int where
, u32
*val
)
111 *val
= (u32
)pci_read_config(pdev
->dev
, where
, 4);
116 pci_write_config_byte(struct pci_dev
*pdev
, int where
, u8 val
)
118 pci_write_config(pdev
->dev
, where
, val
, 1);
123 pci_write_config_word(struct pci_dev
*pdev
, int where
, u16 val
)
125 pci_write_config(pdev
->dev
, where
, val
, 2);
130 pci_write_config_dword(struct pci_dev
*pdev
, int where
, u32 val
)
132 pci_write_config(pdev
->dev
, where
, val
, 4);
136 /* extracted from drm/radeon/evergreen.c */
138 pcie_get_readrq(struct pci_dev
*pdev
)
143 err
= pci_find_extcap(pdev
->dev
, PCIY_EXPRESS
, &cap
);
145 cap
+= PCIER_DEVCTRL
;
147 ctl
= pci_read_config(pdev
->dev
, cap
, 2);
149 return 128 << ((ctl
& PCIEM_DEVCTL_MAX_READRQ_MASK
) >> 12);
152 /* valid rq sizes: 128, 256, 512, 1024, 2048, 4096 (^2N) */
154 pcie_set_readrq(struct pci_dev
*pdev
, int rq
)
159 if (rq
< 128 || rq
> 4096 || !is_power_of_2(rq
))
162 err
= pci_find_extcap(pdev
->dev
, PCIY_EXPRESS
, &cap
);
166 cap
+= PCIER_DEVCTRL
;
168 ctl
= pci_read_config(pdev
->dev
, cap
, 2);
169 ctl
&= ~PCIEM_DEVCTL_MAX_READRQ_MASK
;
170 ctl
|= ((ffs(rq
) - 8) << 12);
171 pci_write_config(pdev
->dev
, cap
, ctl
, 2);
175 static inline struct pci_dev
*
176 pci_dev_get(struct pci_dev
*dev
)
178 /* Linux increments a reference count here */
182 static inline struct pci_dev
*
183 pci_dev_put(struct pci_dev
*dev
)
185 /* Linux decrements a reference count here */
191 pci_set_dma_mask(struct pci_dev
*dev
, u64 mask
)
197 pci_set_consistent_dma_mask(struct pci_dev
*dev
, u64 mask
)
202 typedef int pci_power_t
;
212 static inline struct resource_list_entry
*
213 _pci_get_rle(struct pci_dev
*pdev
, int bar
)
215 struct pci_devinfo
*dinfo
;
216 struct device
*dev
= pdev
->dev
;
217 struct resource_list_entry
*rle
;
219 dinfo
= device_get_ivars(dev
);
221 /* Some child devices don't have registered resources, they
222 * are only present in the parent */
224 kprintf("_pci_get_rle: dinfo was NULL, trying again with parent\n");
225 dev
= device_get_parent(dev
);
227 dinfo
= device_get_ivars(dev
);
231 rle
= resource_list_find(&dinfo
->resources
, SYS_RES_MEMORY
, PCIR_BAR(bar
));
233 rle
= resource_list_find(&dinfo
->resources
,
234 SYS_RES_IOPORT
, PCIR_BAR(bar
));
241 * Returns the first address (memory address or I/O port number)
242 * associated with one of the PCI I/O regions.The region is selected by
243 * the integer bar (the base address register), ranging from 0–5 (inclusive).
244 * The return value can be used by ioremap()
246 static inline phys_addr_t
247 pci_resource_start(struct pci_dev
*pdev
, int bar
)
249 struct resource_list_entry
*rle
;
251 rle
= _pci_get_rle(pdev
, bar
);
255 kprintf("pci_resource_start(0x%x, 0x%x) = 0x%lx\n",
256 pdev
->device
, PCIR_BAR(bar
), rman_get_start(rle
->res
));
258 return rman_get_start(rle
->res
);
261 static inline phys_addr_t
262 pci_resource_len(struct pci_dev
*pdev
, int bar
)
264 struct resource_list_entry
*rle
;
266 rle
= _pci_get_rle(pdev
, bar
);
270 kprintf("pci_resource_len(0x%x, 0x%x) = 0x%lx\n",
271 pdev
->device
, PCIR_BAR(bar
), rman_get_size(rle
->res
));
273 return rman_get_size(rle
->res
);
276 static inline void __iomem
*pci_iomap(struct pci_dev
*dev
, int bar
, unsigned long maxlen
)
278 resource_size_t base
, size
;
280 base
= pci_resource_start(dev
, bar
);
281 size
= pci_resource_len(dev
, bar
);
286 if (maxlen
&& size
> maxlen
)
289 return ioremap(base
, size
);
292 #endif /* LINUX_PCI_H */