1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
3 #include <linux/pci.h>
4 #include <asm/mips-boards/piix4.h>
5
6 /* PCI interrupt pins */
7 #define PCIA 1
8 #define PCIB 2
9 #define PCIC 3
10 #define PCID 4
11
12 /* This table is filled in by interrogating the PIIX4 chip */
13 static char pci_irq[5] = {
14 };
15
16 static char irq_tab[][5] = {
17 /* INTA INTB INTC INTD */
18 {0, 0, 0, 0, 0 }, /* 0: GT64120 PCI bridge */
19 {0, 0, 0, 0, 0 }, /* 1: Unused */
20 {0, 0, 0, 0, 0 }, /* 2: Unused */
21 {0, 0, 0, 0, 0 }, /* 3: Unused */
22 {0, 0, 0, 0, 0 }, /* 4: Unused */
23 {0, 0, 0, 0, 0 }, /* 5: Unused */
24 {0, 0, 0, 0, 0 }, /* 6: Unused */
25 {0, 0, 0, 0, 0 }, /* 7: Unused */
26 {0, 0, 0, 0, 0 }, /* 8: Unused */
27 {0, 0, 0, 0, 0 }, /* 9: Unused */
28 {0, 0, 0, 0, PCID }, /* 10: PIIX4 USB */
29 {0, PCIB, 0, 0, 0 }, /* 11: AMD 79C973 Ethernet */
30 {0, PCIC, 0, 0, 0 }, /* 12: Crystal 4281 Sound */
31 {0, 0, 0, 0, 0 }, /* 13: Unused */
32 {0, 0, 0, 0, 0 }, /* 14: Unused */
33 {0, 0, 0, 0, 0 }, /* 15: Unused */
34 {0, 0, 0, 0, 0 }, /* 16: Unused */
35 {0, 0, 0, 0, 0 }, /* 17: Bonito/SOC-it PCI Bridge*/
36 {0, PCIA, PCIB, PCIC, PCID }, /* 18: PCI Slot 1 */
37 {0, PCIB, PCIC, PCID, PCIA }, /* 19: PCI Slot 2 */
38 {0, PCIC, PCID, PCIA, PCIB }, /* 20: PCI Slot 3 */
39 {0, PCID, PCIA, PCIB, PCIC } /* 21: PCI Slot 4 */
40 };
41
pcibios_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)42 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
43 {
44 int virq;
45 virq = irq_tab[slot][pin];
46 return pci_irq[virq];
47 }
48
49 /* Do platform specific device initialization at pci_enable_device() time */
pcibios_plat_dev_init(struct pci_dev * dev)50 int pcibios_plat_dev_init(struct pci_dev *dev)
51 {
52 return 0;
53 }
54
malta_piix_func3_base_fixup(struct pci_dev * dev)55 static void malta_piix_func3_base_fixup(struct pci_dev *dev)
56 {
57 /* Set a sane PM I/O base address */
58 pci_write_config_word(dev, PIIX4_FUNC3_PMBA, 0x1000);
59
60 /* Enable access to the PM I/O region */
61 pci_write_config_byte(dev, PIIX4_FUNC3_PMREGMISC,
62 PIIX4_FUNC3_PMREGMISC_EN);
63 }
64
65 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3,
66 malta_piix_func3_base_fixup);
67
malta_piix_func0_fixup(struct pci_dev * pdev)68 static void malta_piix_func0_fixup(struct pci_dev *pdev)
69 {
70 unsigned char reg_val;
71 u32 reg_val32;
72 u16 reg_val16;
73 /* PIIX PIRQC[A:D] irq mappings */
74 static int piixirqmap[PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MAX] = {
75 0, 0, 0, 3,
76 4, 5, 6, 7,
77 0, 9, 10, 11,
78 12, 0, 14, 15
79 };
80 int i;
81
82 /* Interrogate PIIX4 to get PCI IRQ mapping */
83 for (i = 0; i <= 3; i++) {
84 pci_read_config_byte(pdev, PIIX4_FUNC0_PIRQRC+i, ®_val);
85 if (reg_val & PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_DISABLE)
86 pci_irq[PCIA+i] = 0; /* Disabled */
87 else
88 pci_irq[PCIA+i] = piixirqmap[reg_val &
89 PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MASK];
90 }
91
92 /* Done by YAMON 2.00 onwards */
93 if (PCI_SLOT(pdev->devfn) == 10) {
94 /*
95 * Set top of main memory accessible by ISA or DMA
96 * devices to 16 Mb.
97 */
98 pci_read_config_byte(pdev, PIIX4_FUNC0_TOM, ®_val);
99 pci_write_config_byte(pdev, PIIX4_FUNC0_TOM, reg_val |
100 PIIX4_FUNC0_TOM_TOP_OF_MEMORY_MASK);
101 }
102
103 /* Mux SERIRQ to its pin */
104 pci_read_config_dword(pdev, PIIX4_FUNC0_GENCFG, ®_val32);
105 pci_write_config_dword(pdev, PIIX4_FUNC0_GENCFG,
106 reg_val32 | PIIX4_FUNC0_GENCFG_SERIRQ);
107
108 /* Enable SERIRQ */
109 pci_read_config_byte(pdev, PIIX4_FUNC0_SERIRQC, ®_val);
110 reg_val |= PIIX4_FUNC0_SERIRQC_EN | PIIX4_FUNC0_SERIRQC_CONT;
111 pci_write_config_byte(pdev, PIIX4_FUNC0_SERIRQC, reg_val);
112
113 /* Enable response to special cycles */
114 pci_read_config_word(pdev, PCI_COMMAND, ®_val16);
115 pci_write_config_word(pdev, PCI_COMMAND,
116 reg_val16 | PCI_COMMAND_SPECIAL);
117 }
118
119 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
120 malta_piix_func0_fixup);
121
malta_piix_func1_fixup(struct pci_dev * pdev)122 static void malta_piix_func1_fixup(struct pci_dev *pdev)
123 {
124 unsigned char reg_val;
125
126 /* Done by YAMON 2.02 onwards */
127 if (PCI_SLOT(pdev->devfn) == 10) {
128 /*
129 * IDE Decode enable.
130 */
131 pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
132 ®_val);
133 pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_PRIMARY_HI,
134 reg_val|PIIX4_FUNC1_IDETIM_PRIMARY_HI_IDE_DECODE_EN);
135 pci_read_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
136 ®_val);
137 pci_write_config_byte(pdev, PIIX4_FUNC1_IDETIM_SECONDARY_HI,
138 reg_val|PIIX4_FUNC1_IDETIM_SECONDARY_HI_IDE_DECODE_EN);
139 }
140 }
141
142 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB,
143 malta_piix_func1_fixup);
144
145 /* Enable PCI 2.1 compatibility in PIIX4 */
quirk_dlcsetup(struct pci_dev * dev)146 static void quirk_dlcsetup(struct pci_dev *dev)
147 {
148 u8 odlc, ndlc;
149
150 (void) pci_read_config_byte(dev, PIIX4_FUNC0_DLC, &odlc);
151 /* Enable passive releases and delayed transaction */
152 ndlc = odlc | PIIX4_FUNC0_DLC_USBPR_EN |
153 PIIX4_FUNC0_DLC_PASSIVE_RELEASE_EN |
154 PIIX4_FUNC0_DLC_DELAYED_TRANSACTION_EN;
155 (void) pci_write_config_byte(dev, PIIX4_FUNC0_DLC, ndlc);
156 }
157
158 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0,
159 quirk_dlcsetup);
160