222 lines
5.6 KiB
C
222 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2004 ICT CAS
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* Author: Li xiaoyu, ICT CAS
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* lixy@ict.ac.cn
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*
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* Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
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* Author: Fuxin Zhang, zhangfx@lemote.com
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <loongson.h>
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/* South bridge slot number is set by the pci probe process */
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static u8 sb_slot = 5;
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int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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int irq = 0;
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if (slot == sb_slot) {
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switch (PCI_FUNC(dev->devfn)) {
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case 2:
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irq = 10;
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break;
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case 3:
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irq = 11;
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break;
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case 5:
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irq = 9;
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break;
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}
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} else {
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irq = LOONGSON_IRQ_BASE + 25 + pin;
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}
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return irq;
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}
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/* Do platform specific device initialization at pci_enable_device() time */
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int pcibios_plat_dev_init(struct pci_dev *dev)
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{
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return 0;
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}
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static void loongson2e_nec_fixup(struct pci_dev *pdev)
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{
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unsigned int val;
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/* Configures port 1, 2, 3, 4 to be validate*/
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pci_read_config_dword(pdev, 0xe0, &val);
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pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x4);
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/* System clock is 48-MHz Oscillator. */
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pci_write_config_dword(pdev, 0xe4, 1 << 5);
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}
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static void loongson2e_686b_func0_fixup(struct pci_dev *pdev)
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{
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unsigned char c;
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sb_slot = PCI_SLOT(pdev->devfn);
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printk(KERN_INFO "via686b fix: ISA bridge\n");
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/* Enable I/O Recovery time */
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pci_write_config_byte(pdev, 0x40, 0x08);
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/* Enable ISA refresh */
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pci_write_config_byte(pdev, 0x41, 0x01);
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/* disable ISA line buffer */
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pci_write_config_byte(pdev, 0x45, 0x00);
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/* Gate INTR, and flush line buffer */
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pci_write_config_byte(pdev, 0x46, 0xe0);
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/* Disable PCI Delay Transaction, Enable EISA ports 4D0/4D1. */
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/* pci_write_config_byte(pdev, 0x47, 0x20); */
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/*
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* enable PCI Delay Transaction, Enable EISA ports 4D0/4D1.
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* enable time-out timer
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*/
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pci_write_config_byte(pdev, 0x47, 0xe6);
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/*
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* enable level trigger on pci irqs: 9,10,11,13
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* important! without this PCI interrupts won't work
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*/
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outb(0x2e, 0x4d1);
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/* 512 K PCI Decode */
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pci_write_config_byte(pdev, 0x48, 0x01);
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/* Wait for PGNT before grant to ISA Master/DMA */
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pci_write_config_byte(pdev, 0x4a, 0x84);
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/*
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* Plug'n'Play
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*
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* Parallel DRQ 3, Floppy DRQ 2 (default)
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*/
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pci_write_config_byte(pdev, 0x50, 0x0e);
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/*
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* IRQ Routing for Floppy and Parallel port
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*
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* IRQ 6 for floppy, IRQ 7 for parallel port
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*/
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pci_write_config_byte(pdev, 0x51, 0x76);
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/* IRQ Routing for serial ports (take IRQ 3 and 4) */
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pci_write_config_byte(pdev, 0x52, 0x34);
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/* All IRQ's level triggered. */
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pci_write_config_byte(pdev, 0x54, 0x00);
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/* route PIRQA-D irq */
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pci_write_config_byte(pdev, 0x55, 0x90); /* bit 7-4, PIRQA */
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pci_write_config_byte(pdev, 0x56, 0xba); /* bit 7-4, PIRQC; */
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/* 3-0, PIRQB */
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pci_write_config_byte(pdev, 0x57, 0xd0); /* bit 7-4, PIRQD */
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/* enable function 5/6, audio/modem */
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pci_read_config_byte(pdev, 0x85, &c);
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c &= ~(0x3 << 2);
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pci_write_config_byte(pdev, 0x85, c);
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printk(KERN_INFO"via686b fix: ISA bridge done\n");
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}
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static void loongson2e_686b_func1_fixup(struct pci_dev *pdev)
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{
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printk(KERN_INFO"via686b fix: IDE\n");
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/* Modify IDE controller setup */
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pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 48);
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pci_write_config_byte(pdev, PCI_COMMAND,
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PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
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PCI_COMMAND_MASTER);
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pci_write_config_byte(pdev, 0x40, 0x0b);
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/* legacy mode */
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pci_write_config_byte(pdev, 0x42, 0x09);
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#if 1/* play safe, otherwise we may see notebook's usb keyboard lockup */
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/* disable read prefetch/write post buffers */
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pci_write_config_byte(pdev, 0x41, 0x02);
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/* use 3/4 as fifo thresh hold */
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pci_write_config_byte(pdev, 0x43, 0x0a);
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pci_write_config_byte(pdev, 0x44, 0x00);
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pci_write_config_byte(pdev, 0x45, 0x00);
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#else
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pci_write_config_byte(pdev, 0x41, 0xc2);
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pci_write_config_byte(pdev, 0x43, 0x35);
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pci_write_config_byte(pdev, 0x44, 0x1c);
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pci_write_config_byte(pdev, 0x45, 0x10);
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#endif
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printk(KERN_INFO"via686b fix: IDE done\n");
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}
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static void loongson2e_686b_func2_fixup(struct pci_dev *pdev)
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{
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/* irq routing */
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pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, 10);
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}
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static void loongson2e_686b_func3_fixup(struct pci_dev *pdev)
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{
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/* irq routing */
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pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, 11);
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}
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static void loongson2e_686b_func5_fixup(struct pci_dev *pdev)
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{
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unsigned int val;
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unsigned char c;
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/* enable IO */
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pci_write_config_byte(pdev, PCI_COMMAND,
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PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
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PCI_COMMAND_MASTER);
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pci_read_config_dword(pdev, 0x4, &val);
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pci_write_config_dword(pdev, 0x4, val | 1);
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/* route ac97 IRQ */
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pci_write_config_byte(pdev, 0x3c, 9);
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pci_read_config_byte(pdev, 0x8, &c);
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/* link control: enable link & SGD PCM output */
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pci_write_config_byte(pdev, 0x41, 0xcc);
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/* disable game port, FM, midi, sb, enable write to reg2c-2f */
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pci_write_config_byte(pdev, 0x42, 0x20);
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/* we are using Avance logic codec */
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pci_write_config_word(pdev, 0x2c, 0x1005);
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pci_write_config_word(pdev, 0x2e, 0x4710);
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pci_read_config_dword(pdev, 0x2c, &val);
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pci_write_config_byte(pdev, 0x42, 0x0);
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}
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686,
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loongson2e_686b_func0_fixup);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1,
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loongson2e_686b_func1_fixup);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2,
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loongson2e_686b_func2_fixup);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3,
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loongson2e_686b_func3_fixup);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5,
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loongson2e_686b_func5_fixup);
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
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loongson2e_nec_fixup);
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