blob: e5738ee26f4f1e21303d932f58f0b2d1bb4dd741 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -06001/*
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/delay.h>
13#include <linux/mm.h>
14#include <asm/addrspace.h>
15#include <linux/vmalloc.h>
16
17#include <lantiq_soc.h>
18
19#include "pci-lantiq.h"
20
21#define LTQ_PCI_CFG_BUSNUM_SHF 16
22#define LTQ_PCI_CFG_DEVNUM_SHF 11
23#define LTQ_PCI_CFG_FUNNUM_SHF 8
24
25#define PCI_ACCESS_READ 0
26#define PCI_ACCESS_WRITE 1
27
28static int ltq_pci_config_access(unsigned char access_type, struct pci_bus *bus,
29 unsigned int devfn, unsigned int where, u32 *data)
30{
31 unsigned long cfg_base;
32 unsigned long flags;
33 u32 temp;
34
35 /* we support slot from 0 to 15 dev_fn & 0x68 (AD29) is the
36 SoC itself */
37 if ((bus->number != 0) || ((devfn & 0xf8) > 0x78)
38 || ((devfn & 0xf8) == 0) || ((devfn & 0xf8) == 0x68))
39 return 1;
40
41 spin_lock_irqsave(&ebu_lock, flags);
42
43 cfg_base = (unsigned long) ltq_pci_mapped_cfg;
44 cfg_base |= (bus->number << LTQ_PCI_CFG_BUSNUM_SHF) | (devfn <<
45 LTQ_PCI_CFG_FUNNUM_SHF) | (where & ~0x3);
46
47 /* Perform access */
48 if (access_type == PCI_ACCESS_WRITE) {
49 ltq_w32(swab32(*data), ((u32 *)cfg_base));
50 } else {
51 *data = ltq_r32(((u32 *)(cfg_base)));
52 *data = swab32(*data);
53 }
54 wmb();
55
56 /* clean possible Master abort */
57 cfg_base = (unsigned long) ltq_pci_mapped_cfg;
58 cfg_base |= (0x0 << LTQ_PCI_CFG_FUNNUM_SHF) + 4;
59 temp = ltq_r32(((u32 *)(cfg_base)));
60 temp = swab32(temp);
61 cfg_base = (unsigned long) ltq_pci_mapped_cfg;
62 cfg_base |= (0x68 << LTQ_PCI_CFG_FUNNUM_SHF) + 4;
63 ltq_w32(temp, ((u32 *)cfg_base));
64
65 spin_unlock_irqrestore(&ebu_lock, flags);
66
67 if (((*data) == 0xffffffff) && (access_type == PCI_ACCESS_READ))
68 return 1;
69
70 return 0;
71}
72
73int ltq_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn,
74 int where, int size, u32 *val)
75{
76 u32 data = 0;
77
78 if (ltq_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
79 return PCIBIOS_DEVICE_NOT_FOUND;
80
81 if (size == 1)
82 *val = (data >> ((where & 3) << 3)) & 0xff;
83 else if (size == 2)
84 *val = (data >> ((where & 3) << 3)) & 0xffff;
85 else
86 *val = data;
87
88 return PCIBIOS_SUCCESSFUL;
89}
90
91int ltq_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
92 int where, int size, u32 val)
93{
94 u32 data = 0;
95
96 if (size == 4) {
97 data = val;
98 } else {
99 if (ltq_pci_config_access(PCI_ACCESS_READ, bus,
100 devfn, where, &data))
101 return PCIBIOS_DEVICE_NOT_FOUND;
102
103 if (size == 1)
104 data = (data & ~(0xff << ((where & 3) << 3))) |
105 (val << ((where & 3) << 3));
106 else if (size == 2)
107 data = (data & ~(0xffff << ((where & 3) << 3))) |
108 (val << ((where & 3) << 3));
109 }
110
111 if (ltq_pci_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
112 return PCIBIOS_DEVICE_NOT_FOUND;
113
114 return PCIBIOS_SUCCESSFUL;
115}