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1/*
2 * Generic SH-4 / SH-4A PCIC operations (SH7751, SH7780).
3 *
4 * Copyright (C) 2002 - 2009 Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License v2. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10#include <linux/pci.h>
11#include <linux/io.h>
12#include <linux/spinlock.h>
13#include <asm/addrspace.h>
14#include "pci-sh4.h"
15
16/*
17 * Direct access to PCI hardware...
18 */
19#define CONFIG_CMD(bus, devfn, where) \
20 (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
21
22/*
23 * Functions for accessing PCI configuration space with type 1 accesses
24 */
25static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
26 int where, int size, u32 *val)
27{
28 struct pci_channel *chan = bus->sysdata;
29 unsigned long flags;
30 u32 data;
31
32 /*
33 * PCIPDR may only be accessed as 32 bit words,
34 * so we must do byte alignment by hand
35 */
36 raw_spin_lock_irqsave(&pci_config_lock, flags);
37 pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
38 data = pci_read_reg(chan, SH4_PCIPDR);
39 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
40
41 switch (size) {
42 case 1:
43 *val = (data >> ((where & 3) << 3)) & 0xff;
44 break;
45 case 2:
46 *val = (data >> ((where & 2) << 3)) & 0xffff;
47 break;
48 case 4:
49 *val = data;
50 break;
51 default:
52 return PCIBIOS_FUNC_NOT_SUPPORTED;
53 }
54
55 return PCIBIOS_SUCCESSFUL;
56}
57
58/*
59 * Since SH4 only does 32bit access we'll have to do a read,
60 * mask,write operation.
61 * We'll allow an odd byte offset, though it should be illegal.
62 */
63static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
64 int where, int size, u32 val)
65{
66 struct pci_channel *chan = bus->sysdata;
67 unsigned long flags;
68 int shift;
69 u32 data;
70
71 raw_spin_lock_irqsave(&pci_config_lock, flags);
72 pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
73 data = pci_read_reg(chan, SH4_PCIPDR);
74 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
75
76 switch (size) {
77 case 1:
78 shift = (where & 3) << 3;
79 data &= ~(0xff << shift);
80 data |= ((val & 0xff) << shift);
81 break;
82 case 2:
83 shift = (where & 2) << 3;
84 data &= ~(0xffff << shift);
85 data |= ((val & 0xffff) << shift);
86 break;
87 case 4:
88 data = val;
89 break;
90 default:
91 return PCIBIOS_FUNC_NOT_SUPPORTED;
92 }
93
94 pci_write_reg(chan, data, SH4_PCIPDR);
95
96 return PCIBIOS_SUCCESSFUL;
97}
98
99struct pci_ops sh4_pci_ops = {
100 .read = sh4_pci_read,
101 .write = sh4_pci_write,
102};
103
104int __attribute__((weak)) pci_fixup_pcic(struct pci_channel *chan)
105{
106 /* Nothing to do. */
107 return 0;
108}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Generic SH-4 / SH-4A PCIC operations (SH7751, SH7780).
4 *
5 * Copyright (C) 2002 - 2009 Paul Mundt
6 */
7#include <linux/pci.h>
8#include <linux/io.h>
9#include <linux/spinlock.h>
10#include <asm/addrspace.h>
11#include "pci-sh4.h"
12
13/*
14 * Direct access to PCI hardware...
15 */
16#define CONFIG_CMD(bus, devfn, where) \
17 (0x80000000 | (bus->number << 16) | (devfn << 8) | (where & ~3))
18
19/*
20 * Functions for accessing PCI configuration space with type 1 accesses
21 */
22static int sh4_pci_read(struct pci_bus *bus, unsigned int devfn,
23 int where, int size, u32 *val)
24{
25 struct pci_channel *chan = bus->sysdata;
26 unsigned long flags;
27 u32 data;
28
29 /*
30 * PCIPDR may only be accessed as 32 bit words,
31 * so we must do byte alignment by hand
32 */
33 raw_spin_lock_irqsave(&pci_config_lock, flags);
34 pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
35 data = pci_read_reg(chan, SH4_PCIPDR);
36 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
37
38 switch (size) {
39 case 1:
40 *val = (data >> ((where & 3) << 3)) & 0xff;
41 break;
42 case 2:
43 *val = (data >> ((where & 2) << 3)) & 0xffff;
44 break;
45 case 4:
46 *val = data;
47 break;
48 default:
49 return PCIBIOS_FUNC_NOT_SUPPORTED;
50 }
51
52 return PCIBIOS_SUCCESSFUL;
53}
54
55/*
56 * Since SH4 only does 32bit access we'll have to do a read,
57 * mask,write operation.
58 * We'll allow an odd byte offset, though it should be illegal.
59 */
60static int sh4_pci_write(struct pci_bus *bus, unsigned int devfn,
61 int where, int size, u32 val)
62{
63 struct pci_channel *chan = bus->sysdata;
64 unsigned long flags;
65 int shift;
66 u32 data;
67
68 raw_spin_lock_irqsave(&pci_config_lock, flags);
69 pci_write_reg(chan, CONFIG_CMD(bus, devfn, where), SH4_PCIPAR);
70 data = pci_read_reg(chan, SH4_PCIPDR);
71 raw_spin_unlock_irqrestore(&pci_config_lock, flags);
72
73 switch (size) {
74 case 1:
75 shift = (where & 3) << 3;
76 data &= ~(0xff << shift);
77 data |= ((val & 0xff) << shift);
78 break;
79 case 2:
80 shift = (where & 2) << 3;
81 data &= ~(0xffff << shift);
82 data |= ((val & 0xffff) << shift);
83 break;
84 case 4:
85 data = val;
86 break;
87 default:
88 return PCIBIOS_FUNC_NOT_SUPPORTED;
89 }
90
91 pci_write_reg(chan, data, SH4_PCIPDR);
92
93 return PCIBIOS_SUCCESSFUL;
94}
95
96struct pci_ops sh4_pci_ops = {
97 .read = sh4_pci_read,
98 .write = sh4_pci_write,
99};
100
101int __attribute__((weak)) pci_fixup_pcic(struct pci_channel *chan)
102{
103 /* Nothing to do. */
104 return 0;
105}