summaryrefslogtreecommitdiff
path: root/arch/sh/drivers/pci/common.c
blob: 0d7eb7b5ac8d00feed926b332500e43a0d55fb35 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
// SPDX-License-Identifier: GPL-2.0
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/kernel.h>

/*
 * These functions are used early on before PCI scanning is done
 * and all of the pci_dev and pci_bus structures have been created.
 */
static struct pci_dev *fake_pci_dev(struct pci_channel *hose,
	int top_bus, int busnr, int devfn)
{
	static struct pci_dev dev;
	static struct pci_bus bus;

	dev.bus = &bus;
	dev.sysdata = hose;
	dev.devfn = devfn;
	bus.number = busnr;
	bus.sysdata = hose;
	bus.ops = hose->pci_ops;

	if(busnr != top_bus)
		/* Fake a parent bus structure. */
		bus.parent = &bus;
	else
		bus.parent = NULL;

	return &dev;
}

#define EARLY_PCI_OP(rw, size, type)					\
int __init early_##rw##_config_##size(struct pci_channel *hose,		\
	int top_bus, int bus, int devfn, int offset, type value)	\
{									\
	return pci_##rw##_config_##size(				\
		fake_pci_dev(hose, top_bus, bus, devfn),		\
		offset, value);						\
}

EARLY_PCI_OP(read, byte, u8 *)
EARLY_PCI_OP(read, word, u16 *)
EARLY_PCI_OP(read, dword, u32 *)
EARLY_PCI_OP(write, byte, u8)
EARLY_PCI_OP(write, word, u16)
EARLY_PCI_OP(write, dword, u32)

int __init pci_is_66mhz_capable(struct pci_channel *hose,
				int top_bus, int current_bus)
{
	u32 pci_devfn;
	unsigned short vid;
	int cap66 = -1;
	u16 stat;

	printk(KERN_INFO "PCI: Checking 66MHz capabilities...\n");

	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
		if (PCI_FUNC(pci_devfn))
			continue;
		if (early_read_config_word(hose, top_bus, current_bus,
					   pci_devfn, PCI_VENDOR_ID, &vid) !=
		    PCIBIOS_SUCCESSFUL)
			continue;
		if (vid == 0xffff)
			continue;

		/* check 66MHz capability */
		if (cap66 < 0)
			cap66 = 1;
		if (cap66) {
			early_read_config_word(hose, top_bus, current_bus,
					       pci_devfn, PCI_STATUS, &stat);
			if (!(stat & PCI_STATUS_66MHZ)) {
				printk(KERN_DEBUG
				       "PCI: %02x:%02x not 66MHz capable.\n",
				       current_bus, pci_devfn);
				cap66 = 0;
				break;
			}
		}
	}

	return cap66 > 0;
}

static void pcibios_enable_err(unsigned long __data)
{
	struct pci_channel *hose = (struct pci_channel *)__data;

	del_timer(&hose->err_timer);
	printk(KERN_DEBUG "PCI: re-enabling error IRQ.\n");
	enable_irq(hose->err_irq);
}

static void pcibios_enable_serr(unsigned long __data)
{
	struct pci_channel *hose = (struct pci_channel *)__data;

	del_timer(&hose->serr_timer);
	printk(KERN_DEBUG "PCI: re-enabling system error IRQ.\n");
	enable_irq(hose->serr_irq);
}

void pcibios_enable_timers(struct pci_channel *hose)
{
	if (hose->err_irq) {
		setup_timer(&hose->err_timer, pcibios_enable_err,
			    (unsigned long)hose);
	}

	if (hose->serr_irq) {
		setup_timer(&hose->serr_timer, pcibios_enable_serr,
			    (unsigned long)hose);
	}
}

/*
 * A simple handler for the regular PCI status errors, called from IRQ
 * context.
 */
unsigned int pcibios_handle_status_errors(unsigned long addr,
					  unsigned int status,
					  struct pci_channel *hose)
{
	unsigned int cmd = 0;

	if (status & PCI_STATUS_REC_MASTER_ABORT) {
		printk(KERN_DEBUG "PCI: master abort, pc=0x%08lx\n", addr);
		cmd |= PCI_STATUS_REC_MASTER_ABORT;
	}

	if (status & PCI_STATUS_REC_TARGET_ABORT) {
		printk(KERN_DEBUG "PCI: target abort: ");
		pcibios_report_status(PCI_STATUS_REC_TARGET_ABORT |
				      PCI_STATUS_SIG_TARGET_ABORT |
				      PCI_STATUS_REC_MASTER_ABORT, 1);
		printk("\n");

		cmd |= PCI_STATUS_REC_TARGET_ABORT;
	}

	if (status & (PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY)) {
		printk(KERN_DEBUG "PCI: parity error detected: ");
		pcibios_report_status(PCI_STATUS_PARITY |
				      PCI_STATUS_DETECTED_PARITY, 1);
		printk("\n");

		cmd |= PCI_STATUS_PARITY | PCI_STATUS_DETECTED_PARITY;

		/* Now back off of the IRQ for awhile */
		if (hose->err_irq) {
			disable_irq_nosync(hose->err_irq);
			hose->err_timer.expires = jiffies + HZ;
			add_timer(&hose->err_timer);
		}
	}

	return cmd;
}