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