arch/mips/pci/pci-tx4939.c

   1 /*
   2  * linux/arch/mips/pci/pci-tx4939.c
   3  *
   4  * Based on linux/arch/mips/txx9/rbtx4939/setup.c,
   5  *          and RBTX49xx patch from CELF patch archive.
   6  *
   7  * Copyright 2001, 2003-2005 MontaVista Software Inc.
   8  * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
   9  * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15 #include <linux/init.h>
  16 #include <linux/pci.h>
  17 #include <linux/kernel.h>
  18 #include <linux/interrupt.h>
  19 #include <asm/txx9/generic.h>
  20 #include <asm/txx9/tx4939.h>
  21
  22 int __init tx4939_report_pciclk(void)
  23 {
  24         int pciclk = 0;
  25
  26         pr_info("PCIC --%s PCICLK:",
  27                 (__raw_readq(&tx4939_ccfgptr->ccfg) & TX4939_CCFG_PCI66) ?
  28                 " PCI66" : "");
  29         if (__raw_readq(&tx4939_ccfgptr->pcfg) & TX4939_PCFG_PCICLKEN_ALL) {
  30                 pciclk = txx9_master_clock * 20 / 6;
  31                 if (!(__raw_readq(&tx4939_ccfgptr->ccfg) & TX4939_CCFG_PCI66))
  32                         pciclk /= 2;
  33                 printk(KERN_CONT "Internal(%u.%uMHz)",
  34                        (pciclk + 50000) / 1000000,
  35                        ((pciclk + 50000) / 100000) % 10);
  36         } else {
  37                 printk(KERN_CONT "External");
  38                 pciclk = -1;
  39         }
  40         printk(KERN_CONT "\n");
  41         return pciclk;
  42 }
  43
  44 void __init tx4939_report_pci1clk(void)
  45 {
  46         unsigned int pciclk = txx9_master_clock * 20 / 6;
  47
  48         pr_info("PCIC1 -- PCICLK:%u.%uMHz\n",
  49                 (pciclk + 50000) / 1000000,
  50                 ((pciclk + 50000) / 100000) % 10);
  51 }
  52
  53 int __init tx4939_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
  54 {
  55         if (get_tx4927_pcicptr(dev->bus->sysdata) == tx4939_pcic1ptr) {
  56                 switch (slot) {
  57                 case TX4927_PCIC_IDSEL_AD_TO_SLOT(31):
  58                         if (__raw_readq(&tx4939_ccfgptr->pcfg) &
  59                             TX4939_PCFG_ET0MODE)
  60                                 return TXX9_IRQ_BASE + TX4939_IR_ETH(0);
  61                         break;
  62                 case TX4927_PCIC_IDSEL_AD_TO_SLOT(30):
  63                         if (__raw_readq(&tx4939_ccfgptr->pcfg) &
  64                             TX4939_PCFG_ET1MODE)
  65                                 return TXX9_IRQ_BASE + TX4939_IR_ETH(1);
  66                         break;
  67                 }
  68                 return 0;
  69         }
  70         return -1;
  71 }
  72
  73 int __init tx4939_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  74 {
  75         int irq = tx4939_pcic1_map_irq(dev, slot);
  76
  77         if (irq >= 0)
  78                 return irq;
  79         irq = pin;
  80         /* IRQ rotation */
  81         irq--;  /* 0-3 */
  82         irq = (irq + 33 - slot) % 4;
  83         irq++;  /* 1-4 */
  84
  85         switch (irq) {
  86         case 1:
  87                 irq = TXX9_IRQ_BASE + TX4939_IR_INTA;
  88                 break;
  89         case 2:
  90                 irq = TXX9_IRQ_BASE + TX4939_IR_INTB;
  91                 break;
  92         case 3:
  93                 irq = TXX9_IRQ_BASE + TX4939_IR_INTC;
  94                 break;
  95         case 4:
  96                 irq = TXX9_IRQ_BASE + TX4939_IR_INTD;
  97                 break;
  98         }
  99         return irq;
 100 }
 101
 102 void __init tx4939_setup_pcierr_irq(void)
 103 {
 104         if (request_irq(TXX9_IRQ_BASE + TX4939_IR_PCIERR,
 105                         tx4927_pcierr_interrupt,
 106                         IRQF_DISABLED, "PCI error",
 107                         (void *)TX4939_PCIC_REG))
 108                 pr_warning("Failed to request irq for PCIERR\n");
 109 }