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.
6 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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>
15 #include <asm/addrspace.h>
16 #include <linux/vmalloc.h>
18 #include <lantiq_soc.h>
20 #include "pci-lantiq.h"
22 #define LTQ_PCI_CFG_BUSNUM_SHF 16
23 #define LTQ_PCI_CFG_DEVNUM_SHF 11
24 #define LTQ_PCI_CFG_FUNNUM_SHF 8
26 #define PCI_ACCESS_READ 0
27 #define PCI_ACCESS_WRITE 1
29 static int ltq_pci_config_access(unsigned char access_type, struct pci_bus *bus,
30 unsigned int devfn, unsigned int where, u32 *data)
32 unsigned long cfg_base;
36 /* we support slot from 0 to 15 dev_fn & 0x68 (AD29) is the
38 if ((bus->number != 0) || ((devfn & 0xf8) > 0x78)
39 || ((devfn & 0xf8) == 0) || ((devfn & 0xf8) == 0x68))
42 spin_lock_irqsave(&ebu_lock, flags);
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);
49 if (access_type == PCI_ACCESS_WRITE) {
50 ltq_w32(swab32(*data), ((u32 *)cfg_base));
52 *data = ltq_r32(((u32 *)(cfg_base)));
53 *data = swab32(*data);
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)));
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));
66 spin_unlock_irqrestore(&ebu_lock, flags);
68 if (((*data) == 0xffffffff) && (access_type == PCI_ACCESS_READ))
74 int ltq_pci_read_config_dword(struct pci_bus *bus, unsigned int devfn,
75 int where, int size, u32 *val)
79 if (ltq_pci_config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
80 return PCIBIOS_DEVICE_NOT_FOUND;
83 *val = (data >> ((where & 3) << 3)) & 0xff;
85 *val = (data >> ((where & 3) << 3)) & 0xffff;
89 return PCIBIOS_SUCCESSFUL;
92 int ltq_pci_write_config_dword(struct pci_bus *bus, unsigned int devfn,
93 int where, int size, u32 val)
100 if (ltq_pci_config_access(PCI_ACCESS_READ, bus,
101 devfn, where, &data))
102 return PCIBIOS_DEVICE_NOT_FOUND;
105 data = (data & ~(0xff << ((where & 3) << 3))) |
106 (val << ((where & 3) << 3));
108 data = (data & ~(0xffff << ((where & 3) << 3))) |
109 (val << ((where & 3) << 3));
112 if (ltq_pci_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
113 return PCIBIOS_DEVICE_NOT_FOUND;
115 return PCIBIOS_SUCCESSFUL;