2 * Copyright 2003 PMC-Sierra
3 * Author: Manish Lachwani (lachwani@pmc-sierra.com)
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.
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.
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.
26 #include <linux/types.h>
27 #include <linux/pci.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
33 #include <asm/titan_dep.h>
35 static int titan_ht_config_read_dword(struct pci_bus *bus, unsigned int devfn,
36 int offset, u32 * val)
38 volatile uint32_t address;
43 address = (busno << 16) | (devfn << 8) | (offset & 0xfc) | 0x80000000;
48 * RM9000 HT Errata: Issue back to back HT config
49 * transcations. Issue a BIU sync before and
53 *(volatile int32_t *) 0xfb0000f0 |= 0x2;
57 *(volatile int32_t *) 0xfb0006f8 = address;
58 *(val) = *(volatile int32_t *) 0xfb0006fc;
62 * (volatile int32_t *) 0xfb0000f0 |= 0x2;
64 return PCIBIOS_SUCCESSFUL;
67 static int titan_ht_config_read(struct pci_bus *bus, unsigned int devfn,
68 int offset, int size, u32 * val)
72 titan_ht_config_read_dword(bus, devfn, offset, &dword);
74 dword >>= ((offset & 3) << 3);
75 dword &= (0xffffffffU >> ((4 - size) << 8));
77 return PCIBIOS_SUCCESSFUL;
80 static inline int titan_ht_config_write_dword(struct pci_bus *bus,
81 unsigned int devfn, int offset, u32 val)
83 volatile uint32_t address;
88 address = (busno << 16) | (devfn << 8) | (offset & 0xfc) | 0x80000000;
92 *(volatile int32_t *) 0xfb0000f0 |= 0x2;
96 *(volatile int32_t *) 0xfb0006f8 = address;
97 *(volatile int32_t *) 0xfb0006fc = val;
101 *(volatile int32_t *) 0xfb0000f0 |= 0x2;
103 return PCIBIOS_SUCCESSFUL;
106 static int titan_ht_config_write(struct pci_bus *bus, unsigned int devfn,
107 int offset, int size, u32 val)
109 uint32_t val1, val2, mask;
111 titan_ht_config_read_dword(bus, devfn, offset, &val2);
113 val1 = val << ((offset & 3) << 3);
114 mask = ~(0xffffffffU >> ((4 - size) << 8));
115 val2 &= ~(mask << ((offset & 3) << 8));
117 titan_ht_config_write_dword(bus, devfn, offset, val1 | val2);
119 return PCIBIOS_SUCCESSFUL;
122 struct pci_ops titan_ht_pci_ops = {
123 .read = titan_ht_config_read,
124 .write = titan_ht_config_write,