Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/pci/fixup-sni.c
10817 views
1
/*

2
 * This file is subject to the terms and conditions of the GNU General Public

3
 * License.  See the file "COPYING" in the main directory of this archive

4
 * for more details.

5
 *

6
 * SNI specific PCI support for RM200/RM300.

7
 *

8
 * Copyright (C) 1997 - 2000, 2003, 04 Ralf Baechle ([email protected])

9
 */

10
#include <linux/kernel.h>

11
#include <linux/init.h>

12
#include <linux/pci.h>

13


14
#include <asm/mipsregs.h>

15
#include <asm/sni.h>

16


17
#include <irq.h>

18


19
/*

20
 * PCIMT Shortcuts ...

21
 */

22
#define SCSI	PCIMT_IRQ_SCSI

23
#define ETH	PCIMT_IRQ_ETHERNET

24
#define INTA	PCIMT_IRQ_INTA

25
#define INTB	PCIMT_IRQ_INTB

26
#define INTC	PCIMT_IRQ_INTC

27
#define INTD	PCIMT_IRQ_INTD

28


29
/*

30
 * Device 0: PCI EISA Bridge	(directly routed)

31
 * Device 1: NCR53c810 SCSI	(directly routed)

32
 * Device 2: PCnet32 Ethernet	(directly routed)

33
 * Device 3: VGA		(routed to INTB)

34
 * Device 4: Unused

35
 * Device 5: Slot 2

36
 * Device 6: Slot 3

37
 * Device 7: Slot 4

38
 *

39
 * Documentation says the VGA is device 5 and device 3 is unused but that

40
 * seem to be a documentation error.  At least on my RM200C the Cirrus

41
 * Logic CL-GD5434 VGA is device 3.

42
 */

43
static char irq_tab_rm200[8][5] __initdata = {

44
	/*       INTA  INTB  INTC  INTD */

45
	{     0,    0,    0,    0,    0 },	/* EISA bridge */

46
	{  SCSI, SCSI, SCSI, SCSI, SCSI },	/* SCSI */

47
	{   ETH,  ETH,  ETH,  ETH,  ETH },	/* Ethernet */

48
	{  INTB, INTB, INTB, INTB, INTB },	/* VGA */

49
	{     0,    0,    0,    0,    0 },	/* Unused */

50
	{     0, INTB, INTC, INTD, INTA },	/* Slot 2 */

51
	{     0, INTC, INTD, INTA, INTB },	/* Slot 3 */

52
	{     0, INTD, INTA, INTB, INTC },	/* Slot 4 */

53
};

54


55
/*

56
 * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1

57
 *

58
 * The VGA card is optional for RM300 systems.

59
 */

60
static char irq_tab_rm300d[8][5] __initdata = {

61
	/*       INTA  INTB  INTC  INTD */

62
	{     0,    0,    0,    0,    0 },	/* EISA bridge */

63
	{  SCSI, SCSI, SCSI, SCSI, SCSI },	/* SCSI */

64
	{     0, INTC, INTD, INTA, INTB },	/* Slot 1 */

65
	{  INTB, INTB, INTB, INTB, INTB },	/* VGA */

66
	{     0,    0,    0,    0,    0 },	/* Unused */

67
	{     0, INTB, INTC, INTD, INTA },	/* Slot 2 */

68
	{     0, INTC, INTD, INTA, INTB },	/* Slot 3 */

69
	{     0, INTD, INTA, INTB, INTC },	/* Slot 4 */

70
};

71


72
static char irq_tab_rm300e[5][5] __initdata = {

73
	/*       INTA  INTB  INTC  INTD */

74
	{     0,    0,    0,    0,    0 },	/* HOST bridge */

75
	{  SCSI, SCSI, SCSI, SCSI, SCSI },	/* SCSI */

76
	{     0, INTC, INTD, INTA, INTB },	/* Bridge/i960 */

77
	{     0, INTD, INTA, INTB, INTC },	/* Slot 1 */

78
	{     0, INTA, INTB, INTC, INTD },	/* Slot 2 */

79
};

80
#undef SCSI

81
#undef ETH

82
#undef INTA

83
#undef INTB

84
#undef INTC

85
#undef INTD

86


87


88
/*

89
 * PCIT Shortcuts ...

90
 */

91
#define SCSI0	PCIT_IRQ_SCSI0

92
#define SCSI1	PCIT_IRQ_SCSI1

93
#define ETH	PCIT_IRQ_ETHERNET

94
#define INTA	PCIT_IRQ_INTA

95
#define INTB	PCIT_IRQ_INTB

96
#define INTC	PCIT_IRQ_INTC

97
#define INTD	PCIT_IRQ_INTD

98


99
static char irq_tab_pcit[13][5] __initdata = {

100
	/*       INTA  INTB  INTC  INTD */

101
	{     0,     0,     0,     0,     0 },	/* HOST bridge */

102
	{ SCSI0, SCSI0, SCSI0, SCSI0, SCSI0 },	/* SCSI */

103
	{ SCSI1, SCSI1, SCSI1, SCSI1, SCSI1 },	/* SCSI */

104
	{   ETH,   ETH,   ETH,   ETH,   ETH },	/* Ethernet */

105
	{     0,  INTA,  INTB,  INTC,  INTD },	/* PCI-PCI bridge */

106
	{     0,     0,     0,     0,     0 },	/* Unused */

107
	{     0,     0,     0,     0,     0 },	/* Unused */

108
	{     0,     0,     0,     0,     0 },	/* Unused */

109
	{     0,  INTA,  INTB,  INTC,  INTD },	/* Slot 1 */

110
	{     0,  INTB,  INTC,  INTD,  INTA },	/* Slot 2 */

111
	{     0,  INTC,  INTD,  INTA,  INTB },	/* Slot 3 */

112
	{     0,  INTD,  INTA,  INTB,  INTC },	/* Slot 4 */

113
	{     0,  INTA,  INTB,  INTC,  INTD },	/* Slot 5 */

114
};

115


116
static char irq_tab_pcit_cplus[13][5] __initdata = {

117
	/*       INTA  INTB  INTC  INTD */

118
	{     0,     0,     0,     0,     0 },	/* HOST bridge */

119
	{     0,  INTB,  INTC,  INTD,  INTA },	/* PCI Slot 9 */

120
	{     0,     0,     0,     0,     0 },	/* PCI-EISA */

121
	{     0,     0,     0,     0,     0 },	/* Unused */

122
	{     0,  INTA,  INTB,  INTC,  INTD },	/* PCI-PCI bridge */

123
	{     0,  INTB,  INTC,  INTD,  INTA },	/* fixup */

124
};

125


126
static inline int is_rm300_revd(void)

127
{

128
	unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;

129


130
	return (csmsr & 0xa0) == 0x20;

131
}

132


133
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)

134
{

135
	switch (sni_brd_type) {

136
	case SNI_BRD_PCI_TOWER_CPLUS:

137
		if (slot == 4) {

138
			/*

139
			 * SNI messed up interrupt wiring for onboard

140
			 * PCI bus 1; we need to fix this up here

141
			 */

142
			while (dev && dev->bus->number != 1)

143
				dev = dev->bus->self;

144
			if (dev && dev->devfn >= PCI_DEVFN(4, 0))

145
				slot = 5;

146
		}

147
		return irq_tab_pcit_cplus[slot][pin];

148
	case SNI_BRD_PCI_TOWER:

149
	        return irq_tab_pcit[slot][pin];

150


151
	case SNI_BRD_PCI_MTOWER:

152
	        if (is_rm300_revd())

153
		        return irq_tab_rm300d[slot][pin];

154
	        /* fall through */

155


156
	case SNI_BRD_PCI_DESKTOP:

157
	        return irq_tab_rm200[slot][pin];

158


159
	case SNI_BRD_PCI_MTOWER_CPLUS:

160
	        return irq_tab_rm300e[slot][pin];

161
	}

162


163
	return 0;

164
}

165


166
/* Do platform specific device initialization at pci_enable_device() time */

167
int pcibios_plat_dev_init(struct pci_dev *dev)

168
{

169
	return 0;

170
}

171


172