1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2004 ICT CAS
4 * Author: Li xiaoyu, ICT CAS
5 * lixy@ict.ac.cn
6 *
7 * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
8 * Author: Fuxin Zhang, zhangfx@lemote.com
9 */
10 #include <linux/init.h>
11 #include <linux/pci.h>
12
13 #include <loongson.h>
14
15 /* South bridge slot number is set by the pci probe process */
16 static u8 sb_slot = 5;
17
18 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
19 {
20 int irq = 0;
21
22 if (slot == sb_slot) {
23 switch (PCI_FUNC(dev->devfn)) {
24 case 2:
25 irq = 10;
26 break;
27 case 3:
28 irq = 11;
29 break;
30 case 5:
31 irq = 9;
32 break;
33 }
34 } else {
35 irq = LOONGSON_IRQ_BASE + 25 + pin;
36 }
37 return irq;
38
39 }
40
41 /* Do platform specific device initialization at pci_enable_device() time */
42 int pcibios_plat_dev_init(struct pci_dev *dev)
43 {
44 return 0;
45 }
46
47 static void loongson2e_nec_fixup(struct pci_dev *pdev)
48 {
49 unsigned int val;
50
51 /* Configures port 1, 2, 3, 4 to be validate*/
52 pci_read_config_dword(pdev, 0xe0, &val);
53 pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x4);
54
55 /* System clock is 48-MHz Oscillator. */
56 pci_write_config_dword(pdev, 0xe4, 1 << 5);
57 }
58
59 static void loongson2e_686b_func0_fixup(struct pci_dev *pdev)
60 {
61 unsigned char c;
62
63 sb_slot = PCI_SLOT(pdev->devfn);
64
65 printk(KERN_INFO "via686b fix: ISA bridge\n");
66
67 /* Enable I/O Recovery time */
68 pci_write_config_byte(pdev, 0x40, 0x08);
69
70 /* Enable ISA refresh */
71 pci_write_config_byte(pdev, 0x41, 0x01);
72
73 /* disable ISA line buffer */
74 pci_write_config_byte(pdev, 0x45, 0x00);
75
76 /* Gate INTR, and flush line buffer */
77 pci_write_config_byte(pdev, 0x46, 0xe0);
78
79 /* Disable PCI Delay Transaction, Enable EISA ports 4D0/4D1. */
80 /* pci_write_config_byte(pdev, 0x47, 0x20); */
81
82 /*
83 * enable PCI Delay Transaction, Enable EISA ports 4D0/4D1.
84 * enable time-out timer
85 */
86 pci_write_config_byte(pdev, 0x47, 0xe6);
87
88 /*
89 * enable level trigger on pci irqs: 9,10,11,13
90 * important! without this PCI interrupts won't work
91 */
92 outb(0x2e, 0x4d1);
93
94 /* 512 K PCI Decode */
95 pci_write_config_byte(pdev, 0x48, 0x01);
96
97 /* Wait for PGNT before grant to ISA Master/DMA */
98 pci_write_config_byte(pdev, 0x4a, 0x84);
99
100 /*
101 * Plug'n'Play
102 *
103 * Parallel DRQ 3, Floppy DRQ 2 (default)
104 */
105 pci_write_config_byte(pdev, 0x50, 0x0e);
106
107 /*
108 * IRQ Routing for Floppy and Parallel port
109 *
110 * IRQ 6 for floppy, IRQ 7 for parallel port
111 */
112 pci_write_config_byte(pdev, 0x51, 0x76);
113
114 /* IRQ Routing for serial ports (take IRQ 3 and 4) */
115 pci_write_config_byte(pdev, 0x52, 0x34);
116
117 /* All IRQ's level triggered. */
118 pci_write_config_byte(pdev, 0x54, 0x00);
119
120 /* route PIRQA-D irq */
121 pci_write_config_byte(pdev, 0x55, 0x90); /* bit 7-4, PIRQA */
122 pci_write_config_byte(pdev, 0x56, 0xba); /* bit 7-4, PIRQC; */
123 /* 3-0, PIRQB */
124 pci_write_config_byte(pdev, 0x57, 0xd0); /* bit 7-4, PIRQD */
125
126 /* enable function 5/6, audio/modem */
127 pci_read_config_byte(pdev, 0x85, &c);
128 c &= ~(0x3 << 2);
129 pci_write_config_byte(pdev, 0x85, c);
130
131 printk(KERN_INFO"via686b fix: ISA bridge done\n");
132 }
133
134 static void loongson2e_686b_func1_fixup(struct pci_dev *pdev)
135 {
136 printk(KERN_INFO"via686b fix: IDE\n");
137
138 /* Modify IDE controller setup */
139 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 48);
140 pci_write_config_byte(pdev, PCI_COMMAND,
141 PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
142 PCI_COMMAND_MASTER);
143 pci_write_config_byte(pdev, 0x40, 0x0b);
144 /* legacy mode */
145 pci_write_config_byte(pdev, 0x42, 0x09);
146
147 #if 1/* play safe, otherwise we may see notebook's usb keyboard lockup */
148 /* disable read prefetch/write post buffers */
149 pci_write_config_byte(pdev, 0x41, 0x02);
150
151 /* use 3/4 as fifo thresh hold */
152 pci_write_config_byte(pdev, 0x43, 0x0a);
153 pci_write_config_byte(pdev, 0x44, 0x00);
154
155 pci_write_config_byte(pdev, 0x45, 0x00);
156 #else
157 pci_write_config_byte(pdev, 0x41, 0xc2);
158 pci_write_config_byte(pdev, 0x43, 0x35);
159 pci_write_config_byte(pdev, 0x44, 0x1c);
160
161 pci_write_config_byte(pdev, 0x45, 0x10);
162 #endif
163
164 printk(KERN_INFO"via686b fix: IDE done\n");
165 }
166
167 static void loongson2e_686b_func2_fixup(struct pci_dev *pdev)
168 {
169 /* irq routing */
170 pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, 10);
171 }
172
173 static void loongson2e_686b_func3_fixup(struct pci_dev *pdev)
174 {
175 /* irq routing */
176 pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, 11);
177 }
178
179 static void loongson2e_686b_func5_fixup(struct pci_dev *pdev)
180 {
181 unsigned int val;
182 unsigned char c;
183
184 /* enable IO */
185 pci_write_config_byte(pdev, PCI_COMMAND,
186 PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
187 PCI_COMMAND_MASTER);
188 pci_read_config_dword(pdev, 0x4, &val);
189 pci_write_config_dword(pdev, 0x4, val | 1);
190
191 /* route ac97 IRQ */
192 pci_write_config_byte(pdev, 0x3c, 9);
193
194 pci_read_config_byte(pdev, 0x8, &c);
195
196 /* link control: enable link & SGD PCM output */
197 pci_write_config_byte(pdev, 0x41, 0xcc);
198
199 /* disable game port, FM, midi, sb, enable write to reg2c-2f */
200 pci_write_config_byte(pdev, 0x42, 0x20);
201
202 /* we are using Avance logic codec */
203 pci_write_config_word(pdev, 0x2c, 0x1005);
204 pci_write_config_word(pdev, 0x2e, 0x4710);
205 pci_read_config_dword(pdev, 0x2c, &val);
206
207 pci_write_config_byte(pdev, 0x42, 0x0);
208 }
209
210 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
211 loongson2e_686b_func0_fixup);
212 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1,
213 loongson2e_686b_func1_fixup);
214 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2,
215 loongson2e_686b_func2_fixup);
216 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3,
217 loongson2e_686b_func3_fixup);
218 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5,
219 loongson2e_686b_func5_fixup);
220 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
221 loongson2e_nec_fixup);
222
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