1 /*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
5 *
6 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
7 */
8
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/mm.h>
15 #include <asm/addrspace.h>
16 #include <linux/vmalloc.h>
17
18 #include <lantiq_soc.h>
19
20 #include "pci-lantiq.h"
21
22 #define LTQ_PCI_CFG_BUSNUM_SHF 16
23 #define LTQ_PCI_CFG_DEVNUM_SHF 11
24 #define LTQ_PCI_CFG_FUNNUM_SHF 8
25
26 #define PCI_ACCESS_READ 0
27 #define PCI_ACCESS_WRITE 1
28
ltq_pci_config_access(unsigned char access_type,struct pci_bus * bus,unsigned int devfn,unsigned int where,u32 * data)29 static int ltq_pci_config_access(unsigned char access_type, struct pci_bus *bus,
30 unsigned int devfn, unsigned int where, u32 *data)
31 {
32 unsigned long cfg_base;
33 unsigned long flags;
34 u32 temp;
35
36 /* we support slot from 0 to 15 dev_fn & 0x68 (AD29) is the
37 SoC itself */
38 if ((bus->number != 0) || ((devfn & 0xf8) > 0x78)
39 || ((devfn & 0xf8) == 0) || ((devfn & 0xf8) == 0x68))
40 return 1;
41
42 spin_lock_irqsave(&ebu_lock, flags);
43
44 cfg_base = (unsigned long) ltq_pci_mapped_cfg;
45 cfg_base |= (bus->number << LTQ_PCI_CFG_BUSNUM_SHF) | (devfn <<
46 LTQ_PCI_CFG_FUNNUM_SHF) | (where & ~0x3);
47
48 /* Perform access */
49 if (access_type == PCI_ACCESS_WRITE) {
50 ltq_w32(swab32(*data), ((u32 *)cfg_base));
51 } else {
52 *data = ltq_r32(((u32 *)(cfg_base)));
53 *data = swab32(*data);
54 }
55 wmb();
56
57 /* clean possible Master abort */
58 cfg_base = (unsigned long) ltq_pci_mapped_cfg;
59 cfg_base |= (0x0 << LTQ_PCI_CFG_FUNNUM_SHF) + 4;
60 temp = ltq_r32(((u32 *)(cfg_base)));
61 temp = swab32(temp);
62 cfg_base = (unsigned long) ltq_pci_mapped_cfg;
63 cfg_base |= (0x68 << LTQ_PCI_CFG_FUNNUM_SHF) + 4;
64 ltq_w32(temp, ((u32 *)cfg_base));
65
66 spin_unlock_irqrestore(&ebu_lock, flags);
67
68 if (((*data) == 0xffffffff) && (access_type == PCI_ACCESS_READ))
69 return 1;
70
71 return 0;
72 }
73
ltq_pci_read_config_dword(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)74 int ltq_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn,
75 int where, int size, u32 *val)
76 {
77 u32 data = 0;
78
79 if (ltq_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
80 return PCIBIOS_DEVICE_NOT_FOUND;
81
82 if (size == 1)
83 *val = (data >> ((where & 3) << 3)) & 0xff;
84 else if (size == 2)
85 *val = (data >> ((where & 3) << 3)) & 0xffff;
86 else
87 *val = data;
88
89 return PCIBIOS_SUCCESSFUL;
90 }
91
ltq_pci_write_config_dword(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)92 int ltq_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
93 int where, int size, u32 val)
94 {
95 u32 data = 0;
96
97 if (size == 4) {
98 data = val;
99 } else {
100 if (ltq_pci_config_access(PCI_ACCESS_READ, bus,
101 devfn, where, &data))
102 return PCIBIOS_DEVICE_NOT_FOUND;
103
104 if (size == 1)
105 data = (data & ~(0xff << ((where & 3) << 3))) |
106 (val << ((where & 3) << 3));
107 else if (size == 2)
108 data = (data & ~(0xffff << ((where & 3) << 3))) |
109 (val << ((where & 3) << 3));
110 }
111
112 if (ltq_pci_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
113 return PCIBIOS_DEVICE_NOT_FOUND;
114
115 return PCIBIOS_SUCCESSFUL;
116 }
117