arch/mips/pci/pci-tx4938.c

   1 /*
   2  * Based on linux/arch/mips/txx9/rbtx4938/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/tx4938.h>
  19
  20 int __init tx4938_report_pciclk(void)
  21 {
  22         int pciclk = 0;
  23
  24         pr_info("PCIC --%s PCICLK:",
  25                 (__raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_PCI66) ?
  26                 " PCI66" : "");
  27         if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_PCICLKEN_ALL) {
  28                 u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
  29                 switch ((unsigned long)ccfg &
  30                         TX4938_CCFG_PCIDIVMODE_MASK) {
  31                 case TX4938_CCFG_PCIDIVMODE_4:
  32                         pciclk = txx9_cpu_clock / 4; break;
  33                 case TX4938_CCFG_PCIDIVMODE_4_5:
  34                         pciclk = txx9_cpu_clock * 2 / 9; break;
  35                 case TX4938_CCFG_PCIDIVMODE_5:
  36                         pciclk = txx9_cpu_clock / 5; break;
  37                 case TX4938_CCFG_PCIDIVMODE_5_5:
  38                         pciclk = txx9_cpu_clock * 2 / 11; break;
  39                 case TX4938_CCFG_PCIDIVMODE_8:
  40                         pciclk = txx9_cpu_clock / 8; break;
  41                 case TX4938_CCFG_PCIDIVMODE_9:
  42                         pciclk = txx9_cpu_clock / 9; break;
  43                 case TX4938_CCFG_PCIDIVMODE_10:
  44                         pciclk = txx9_cpu_clock / 10; break;
  45                 case TX4938_CCFG_PCIDIVMODE_11:
  46                         pciclk = txx9_cpu_clock / 11; break;
  47                 }
  48                 pr_cont("Internal(%u.%uMHz)",
  49                         (pciclk + 50000) / 1000000,
  50                         ((pciclk + 50000) / 100000) % 10);
  51         } else {
  52                 pr_cont("External");
  53                 pciclk = -1;
  54         }
  55         pr_cont("\n");
  56         return pciclk;
  57 }
  58
  59 void __init tx4938_report_pci1clk(void)
  60 {
  61         __u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
  62         unsigned int pciclk =
  63                 txx9_gbus_clock / ((ccfg & TX4938_CCFG_PCI1DMD) ? 4 : 2);
  64
  65         pr_info("PCIC1 -- %sPCICLK:%u.%uMHz\n",
  66                 (ccfg & TX4938_CCFG_PCI1_66) ? "PCI66 " : "",
  67                 (pciclk + 50000) / 1000000,
  68                 ((pciclk + 50000) / 100000) % 10);
  69 }
  70
  71 int __init tx4938_pciclk66_setup(void)
  72 {
  73         int pciclk;
  74
  75         /* Assert M66EN */
  76         tx4938_ccfg_set(TX4938_CCFG_PCI66);
  77         /* Double PCICLK (if possible) */
  78         if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_PCICLKEN_ALL) {
  79                 unsigned int pcidivmode = 0;
  80                 u64 ccfg = __raw_readq(&tx4938_ccfgptr->ccfg);
  81                 pcidivmode = (unsigned long)ccfg &
  82                         TX4938_CCFG_PCIDIVMODE_MASK;
  83                 switch (pcidivmode) {
  84                 case TX4938_CCFG_PCIDIVMODE_8:
  85                 case TX4938_CCFG_PCIDIVMODE_4:
  86                         pcidivmode = TX4938_CCFG_PCIDIVMODE_4;
  87                         pciclk = txx9_cpu_clock / 4;
  88                         break;
  89                 case TX4938_CCFG_PCIDIVMODE_9:
  90                 case TX4938_CCFG_PCIDIVMODE_4_5:
  91                         pcidivmode = TX4938_CCFG_PCIDIVMODE_4_5;
  92                         pciclk = txx9_cpu_clock * 2 / 9;
  93                         break;
  94                 case TX4938_CCFG_PCIDIVMODE_10:
  95                 case TX4938_CCFG_PCIDIVMODE_5:
  96                         pcidivmode = TX4938_CCFG_PCIDIVMODE_5;
  97                         pciclk = txx9_cpu_clock / 5;
  98                         break;
  99                 case TX4938_CCFG_PCIDIVMODE_11:
 100                 case TX4938_CCFG_PCIDIVMODE_5_5:
 101                 default:
 102                         pcidivmode = TX4938_CCFG_PCIDIVMODE_5_5;
 103                         pciclk = txx9_cpu_clock * 2 / 11;
 104                         break;
 105                 }
 106                 tx4938_ccfg_change(TX4938_CCFG_PCIDIVMODE_MASK,
 107                                    pcidivmode);
 108                 pr_debug("PCICLK: ccfg:%08lx\n",
 109                          (unsigned long)__raw_readq(&tx4938_ccfgptr->ccfg));
 110         } else
 111                 pciclk = -1;
 112         return pciclk;
 113 }
 114
 115 int tx4938_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
 116 {
 117         if (get_tx4927_pcicptr(dev->bus->sysdata) == tx4938_pcic1ptr) {
 118                 switch (slot) {
 119                 case TX4927_PCIC_IDSEL_AD_TO_SLOT(31):
 120                         if (__raw_readq(&tx4938_ccfgptr->pcfg) &
 121                             TX4938_PCFG_ETH0_SEL)
 122                                 return TXX9_IRQ_BASE + TX4938_IR_ETH0;
 123                         break;
 124                 case TX4927_PCIC_IDSEL_AD_TO_SLOT(30):
 125                         if (__raw_readq(&tx4938_ccfgptr->pcfg) &
 126                             TX4938_PCFG_ETH1_SEL)
 127                                 return TXX9_IRQ_BASE + TX4938_IR_ETH1;
 128                         break;
 129                 }
 130                 return 0;
 131         }
 132         return -1;
 133 }
 134
 135 void __init tx4938_setup_pcierr_irq(void)
 136 {
 137         if (request_irq(TXX9_IRQ_BASE + TX4938_IR_PCIERR,
 138                         tx4927_pcierr_interrupt,
 139                         0, "PCI error",
 140                         (void *)TX4927_PCIC_REG))
 141                 pr_warn("Failed to request irq for PCIERR\n");
 142 }