arch/mips/pci/pci-tx4938.c

   1 /*
   2  * linux/arch/mips/pci/pci-tx4938.c
   3  *
   4  * Based on linux/arch/mips/txx9/rbtx4938/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/tx4938.h>
  21
  22 int __init tx4938_report_pciclk(void)
  23 {
  24         int pciclk = 0;
  25
  26         printk(KERN_INFO "PCIC --%s PCICLK:",
  27                (__raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_PCI66) ?
  28                " PCI66" : "");
  29         if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_PCICLKEN_ALL) {
  30                 u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
  31                 switch ((unsigned long)ccfg &
  32                         TX4938_CCFG_PCIDIVMODE_MASK) {
  33                 case TX4938_CCFG_PCIDIVMODE_4:
  34                         pciclk = txx9_cpu_clock / 4; break;
  35                 case TX4938_CCFG_PCIDIVMODE_4_5:
  36                         pciclk = txx9_cpu_clock * 2 / 9; break;
  37                 case TX4938_CCFG_PCIDIVMODE_5:
  38                         pciclk = txx9_cpu_clock / 5; break;
  39                 case TX4938_CCFG_PCIDIVMODE_5_5:
  40                         pciclk = txx9_cpu_clock * 2 / 11; break;
  41                 case TX4938_CCFG_PCIDIVMODE_8:
  42                         pciclk = txx9_cpu_clock / 8; break;
  43                 case TX4938_CCFG_PCIDIVMODE_9:
  44                         pciclk = txx9_cpu_clock / 9; break;
  45                 case TX4938_CCFG_PCIDIVMODE_10:
  46                         pciclk = txx9_cpu_clock / 10; break;
  47                 case TX4938_CCFG_PCIDIVMODE_11:
  48                         pciclk = txx9_cpu_clock / 11; break;
  49                 }
  50                 printk("Internal(%u.%uMHz)",
  51                        (pciclk + 50000) / 1000000,
  52                        ((pciclk + 50000) / 100000) % 10);
  53         } else {
  54                 printk("External");
  55                 pciclk = -1;
  56         }
  57         printk("\n");
  58         return pciclk;
  59 }
  60
  61 void __init tx4938_report_pci1clk(void)
  62 {
  63         __u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
  64         unsigned int pciclk =
  65                 txx9_gbus_clock / ((ccfg & TX4938_CCFG_PCI1DMD) ? 4 : 2);
  66
  67         printk(KERN_INFO "PCIC1 -- %sPCICLK:%u.%uMHz\n",
  68                (ccfg & TX4938_CCFG_PCI1_66) ? "PCI66 " : "",
  69                (pciclk + 50000) / 1000000,
  70                ((pciclk + 50000) / 100000) % 10);
  71 }
  72
  73 int __init tx4938_pciclk66_setup(void)
  74 {
  75         int pciclk;
  76
  77         /* Assert M66EN */
  78         tx4938_ccfg_set(TX4938_CCFG_PCI66);
  79         /* Double PCICLK (if possible) */
  80         if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_PCICLKEN_ALL) {
  81                 unsigned int pcidivmode = 0;
  82                 u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
  83                 pcidivmode = (unsigned long)ccfg &
  84                         TX4938_CCFG_PCIDIVMODE_MASK;
  85                 switch (pcidivmode) {
  86                 case TX4938_CCFG_PCIDIVMODE_8:
  87                 case TX4938_CCFG_PCIDIVMODE_4:
  88                         pcidivmode = TX4938_CCFG_PCIDIVMODE_4;
  89                         pciclk = txx9_cpu_clock / 4;
  90                         break;
  91                 case TX4938_CCFG_PCIDIVMODE_9:
  92                 case TX4938_CCFG_PCIDIVMODE_4_5:
  93                         pcidivmode = TX4938_CCFG_PCIDIVMODE_4_5;
  94                         pciclk = txx9_cpu_clock * 2 / 9;
  95                         break;
  96                 case TX4938_CCFG_PCIDIVMODE_10:
  97                 case TX4938_CCFG_PCIDIVMODE_5:
  98                         pcidivmode = TX4938_CCFG_PCIDIVMODE_5;
  99                         pciclk = txx9_cpu_clock / 5;
 100                         break;
 101                 case TX4938_CCFG_PCIDIVMODE_11:
 102                 case TX4938_CCFG_PCIDIVMODE_5_5:
 103                 default:
 104                         pcidivmode = TX4938_CCFG_PCIDIVMODE_5_5;
 105                         pciclk = txx9_cpu_clock * 2 / 11;
 106                         break;
 107                 }
 108                 tx4938_ccfg_change(TX4938_CCFG_PCIDIVMODE_MASK,
 109                                    pcidivmode);
 110                 printk(KERN_DEBUG "PCICLK: ccfg:%08lx\n",
 111                        (unsigned long)__raw_readq(&tx4938_ccfgptr->ccfg));
 112         } else
 113                 pciclk = -1;
 114         return pciclk;
 115 }
 116
 117 int __init tx4938_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
 118 {
 119         if (get_tx4927_pcicptr(dev->bus->sysdata) == tx4938_pcic1ptr) {
 120                 switch (slot) {
 121                 case TX4927_PCIC_IDSEL_AD_TO_SLOT(31):
 122                         if (__raw_readq(&tx4938_ccfgptr->pcfg) &
 123                             TX4938_PCFG_ETH0_SEL)
 124                                 return TXX9_IRQ_BASE + TX4938_IR_ETH0;
 125                         break;
 126                 case TX4927_PCIC_IDSEL_AD_TO_SLOT(30):
 127                         if (__raw_readq(&tx4938_ccfgptr->pcfg) &
 128                             TX4938_PCFG_ETH1_SEL)
 129                                 return TXX9_IRQ_BASE + TX4938_IR_ETH1;
 130                         break;
 131                 }
 132                 return 0;
 133         }
 134         return -1;
 135 }
 136
 137 void __init tx4938_setup_pcierr_irq(void)
 138 {
 139         if (request_irq(TXX9_IRQ_BASE + TX4938_IR_PCIERR,
 140                         tx4927_pcierr_interrupt,
 141                         IRQF_DISABLED, "PCI error",
 142                         (void *)TX4927_PCIC_REG))
 143                 printk(KERN_WARNING "Failed to request irq for PCIERR\n");
 144 }