aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ia64/kernel/msi_ia64.c
blob: 822e59a1b822fdfe4523628508936d844bd07002 (plain) (blame)
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
/*
 * MSI hooks for standard x86 apic
 */

#include <linux/pci.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <asm/smp.h>

/*
 * Shifts for APIC-based data
 */

#define MSI_DATA_VECTOR_SHIFT		0
#define	    MSI_DATA_VECTOR(v)		(((u8)v) << MSI_DATA_VECTOR_SHIFT)

#define MSI_DATA_DELIVERY_SHIFT		8
#define     MSI_DATA_DELIVERY_FIXED	(0 << MSI_DATA_DELIVERY_SHIFT)
#define     MSI_DATA_DELIVERY_LOWPRI	(1 << MSI_DATA_DELIVERY_SHIFT)

#define MSI_DATA_LEVEL_SHIFT		14
#define     MSI_DATA_LEVEL_DEASSERT	(0 << MSI_DATA_LEVEL_SHIFT)
#define     MSI_DATA_LEVEL_ASSERT	(1 << MSI_DATA_LEVEL_SHIFT)

#define MSI_DATA_TRIGGER_SHIFT		15
#define     MSI_DATA_TRIGGER_EDGE	(0 << MSI_DATA_TRIGGER_SHIFT)
#define     MSI_DATA_TRIGGER_LEVEL	(1 << MSI_DATA_TRIGGER_SHIFT)

/*
 * Shift/mask fields for APIC-based bus address
 */

#define MSI_TARGET_CPU_SHIFT		4
#define MSI_ADDR_HEADER			0xfee00000

#define MSI_ADDR_DESTID_MASK		0xfff0000f
#define     MSI_ADDR_DESTID_CPU(cpu)	((cpu) << MSI_TARGET_CPU_SHIFT)

#define MSI_ADDR_DESTMODE_SHIFT		2
#define     MSI_ADDR_DESTMODE_PHYS	(0 << MSI_ADDR_DESTMODE_SHIFT)
#define	    MSI_ADDR_DESTMODE_LOGIC	(1 << MSI_ADDR_DESTMODE_SHIFT)

#define MSI_ADDR_REDIRECTION_SHIFT	3
#define     MSI_ADDR_REDIRECTION_CPU	(0 << MSI_ADDR_REDIRECTION_SHIFT)
#define     MSI_ADDR_REDIRECTION_LOWPRI	(1 << MSI_ADDR_REDIRECTION_SHIFT)

static struct irq_chip	ia64_msi_chip;

#ifdef CONFIG_SMP
static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
{
	struct msi_msg msg;
	u32 addr;

	read_msi_msg(irq, &msg);

	addr = msg.address_lo;
	addr &= MSI_ADDR_DESTID_MASK;
	addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(first_cpu(cpu_mask)));
	msg.address_lo = addr;

	write_msi_msg(irq, &msg);
	set_native_irq_info(irq, cpu_mask);
}
#endif /* CONFIG_SMP */

int ia64_setup_msi_irq(unsigned int irq, struct pci_dev *pdev)
{
	struct msi_msg	msg;
	unsigned long	dest_phys_id;
	unsigned int	vector;

	dest_phys_id = cpu_physical_id(first_cpu(cpu_online_map));
	vector = irq;

	msg.address_hi = 0;
	msg.address_lo =
		MSI_ADDR_HEADER |
		MSI_ADDR_DESTMODE_PHYS |
		MSI_ADDR_REDIRECTION_CPU |
		MSI_ADDR_DESTID_CPU(dest_phys_id);

	msg.data =
		MSI_DATA_TRIGGER_EDGE |
		MSI_DATA_LEVEL_ASSERT |
		MSI_DATA_DELIVERY_FIXED |
		MSI_DATA_VECTOR(vector);

	write_msi_msg(irq, &msg);
	set_irq_chip_and_handler(irq, &ia64_msi_chip, handle_edge_irq);

	return 0;
}

void ia64_teardown_msi_irq(unsigned int irq)
{
	return;		/* no-op */
}

static void ia64_ack_msi_irq(unsigned int irq)
{
	move_native_irq(irq);
	ia64_eoi();
}

static int ia64_msi_retrigger_irq(unsigned int irq)
{
	unsigned int vector = irq;
	ia64_resend_irq(vector);

	return 1;
}

/*
 * Generic ops used on most IA64 platforms.
 */
static struct irq_chip ia64_msi_chip = {
	.name		= "PCI-MSI",
	.mask		= mask_msi_irq,
	.unmask		= unmask_msi_irq,
	.ack		= ia64_ack_msi_irq,
#ifdef CONFIG_SMP
	.set_affinity	= ia64_set_msi_irq_affinity,
#endif
	.retrigger	= ia64_msi_retrigger_irq,
};


int arch_setup_msi_irq(unsigned int irq, struct pci_dev *pdev)
{
	if (platform_setup_msi_irq)
		return platform_setup_msi_irq(irq, pdev);

	return ia64_setup_msi_irq(irq, pdev);
}

void arch_teardown_msi_irq(unsigned int irq)
{
	if (platform_teardown_msi_irq)
		return platform_teardown_msi_irq(irq);

	return ia64_teardown_msi_irq(irq);
}