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ops-titan.c
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1 /*
2  * Copyright 2003 PMC-Sierra
3  * Author: Manish Lachwani ([email protected])
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License as published by the
7  * Free Software Foundation; either version 2 of the License, or (at your
8  * option) any later version.
9  *
10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
13  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
14  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
15  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
16  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
17  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
18  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
19  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
20  *
21  * You should have received a copy of the GNU General Public License along
22  * with this program; if not, write to the Free Software Foundation, Inc.,
23  * 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/kernel.h>
28 
29 #include <asm/pci.h>
30 #include <asm/io.h>
31 #include <asm/rm9k-ocd.h>
32 
33 /*
34  * PCI specific defines
35  */
36 #define TITAN_PCI_0_CONFIG_ADDRESS 0x780
37 #define TITAN_PCI_0_CONFIG_DATA 0x784
38 
39 /*
40  * Titan PCI Config Read Byte
41  */
42 static int titan_read_config(struct pci_bus *bus, unsigned int devfn, int reg,
43  int size, u32 * val)
44 {
45  uint32_t address, tmp;
46  int dev, busno, func;
47 
48  busno = bus->number;
49  dev = PCI_SLOT(devfn);
50  func = PCI_FUNC(devfn);
51 
52  address = (busno << 16) | (dev << 11) | (func << 8) |
53  (reg & 0xfc) | 0x80000000;
54 
55 
56  /* start the configuration cycle */
57  ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
58  tmp = ocd_readl(TITAN_PCI_0_CONFIG_DATA) >> ((reg & 3) << 3);
59 
60  switch (size) {
61  case 1:
62  tmp &= 0xff;
63  case 2:
64  tmp &= 0xffff;
65  }
66  *val = tmp;
67 
68  return PCIBIOS_SUCCESSFUL;
69 }
70 
71 static int titan_write_config(struct pci_bus *bus, unsigned int devfn, int reg,
72  int size, u32 val)
73 {
74  uint32_t address;
75  int dev, busno, func;
76 
77  busno = bus->number;
78  dev = PCI_SLOT(devfn);
79  func = PCI_FUNC(devfn);
80 
81  address = (busno << 16) | (dev << 11) | (func << 8) |
82  (reg & 0xfc) | 0x80000000;
83 
84  /* start the configuration cycle */
85  ocd_writel(address, TITAN_PCI_0_CONFIG_ADDRESS);
86 
87  /* write the data */
88  switch (size) {
89  case 1:
90  ocd_writeb(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x3));
91  break;
92 
93  case 2:
94  ocd_writew(val, TITAN_PCI_0_CONFIG_DATA + (~reg & 0x2));
95  break;
96 
97  case 4:
98  ocd_writel(val, TITAN_PCI_0_CONFIG_DATA);
99  break;
100  }
101 
102  return PCIBIOS_SUCCESSFUL;
103 }
104 
105 /*
106  * Titan PCI structure
107  */
108 struct pci_ops titan_pci_ops = {
109  titan_read_config,
110  titan_write_config,
111 };
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