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