1 /* 2 * linux/arch/mips/pci/pci-tx4927.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/tx4927.h> 21 22 int __init tx4927_report_pciclk(void) 23 { 24 int pciclk = 0; 25 26 printk(KERN_INFO "PCIC --%s PCICLK:", 27 (__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ? 28 " PCI66" : ""); 29 if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) { 30 u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg); 31 switch ((unsigned long)ccfg & 32 TX4927_CCFG_PCIDIVMODE_MASK) { 33 case TX4927_CCFG_PCIDIVMODE_2_5: 34 pciclk = txx9_cpu_clock * 2 / 5; break; 35 case TX4927_CCFG_PCIDIVMODE_3: 36 pciclk = txx9_cpu_clock / 3; break; 37 case TX4927_CCFG_PCIDIVMODE_5: 38 pciclk = txx9_cpu_clock / 5; break; 39 case TX4927_CCFG_PCIDIVMODE_6: 40 pciclk = txx9_cpu_clock / 6; break; 41 } 42 printk("Internal(%u.%uMHz)", 43 (pciclk + 50000) / 1000000, 44 ((pciclk + 50000) / 100000) % 10); 45 } else { 46 printk("External"); 47 pciclk = -1; 48 } 49 printk("\n"); 50 return pciclk; 51 } 52 53 int __init tx4927_pciclk66_setup(void) 54 { 55 int pciclk; 56 57 /* Assert M66EN */ 58 tx4927_ccfg_set(TX4927_CCFG_PCI66); 59 /* Double PCICLK (if possible) */ 60 if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) { 61 unsigned int pcidivmode = 0; 62 u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg); 63 pcidivmode = (unsigned long)ccfg & 64 TX4927_CCFG_PCIDIVMODE_MASK; 65 switch (pcidivmode) { 66 case TX4927_CCFG_PCIDIVMODE_5: 67 case TX4927_CCFG_PCIDIVMODE_2_5: 68 pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5; 69 pciclk = txx9_cpu_clock * 2 / 5; 70 break; 71 case TX4927_CCFG_PCIDIVMODE_6: 72 case TX4927_CCFG_PCIDIVMODE_3: 73 default: 74 pcidivmode = TX4927_CCFG_PCIDIVMODE_3; 75 pciclk = txx9_cpu_clock / 3; 76 } 77 tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK, 78 pcidivmode); 79 printk(KERN_DEBUG "PCICLK: ccfg:%08lx\n", 80 (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg)); 81 } else 82 pciclk = -1; 83 return pciclk; 84 } 85 86 void __init tx4927_setup_pcierr_irq(void) 87 { 88 if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR, 89 tx4927_pcierr_interrupt, 90 IRQF_DISABLED, "PCI error", 91 (void *)TX4927_PCIC_REG)) 92 printk(KERN_WARNING "Failed to request irq for PCIERR\n"); 93 } 94