arch/mips/pci/pci-tx4939.c

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