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/tx4927.h> 19 20 int __init tx4927_report_pciclk(void) 21 { 22 int pciclk = 0; 23 24 pr_info("PCIC --%s PCICLK:", 25 (__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ? 26 " PCI66" : ""); 27 if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) { 28 u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg); 29 switch ((unsigned long)ccfg & 30 TX4927_CCFG_PCIDIVMODE_MASK) { 31 case TX4927_CCFG_PCIDIVMODE_2_5: 32 pciclk = txx9_cpu_clock * 2 / 5; break; 33 case TX4927_CCFG_PCIDIVMODE_3: 34 pciclk = txx9_cpu_clock / 3; break; 35 case TX4927_CCFG_PCIDIVMODE_5: 36 pciclk = txx9_cpu_clock / 5; break; 37 case TX4927_CCFG_PCIDIVMODE_6: 38 pciclk = txx9_cpu_clock / 6; break; 39 } 40 pr_cont("Internal(%u.%uMHz)", 41 (pciclk + 50000) / 1000000, 42 ((pciclk + 50000) / 100000) % 10); 43 } else { 44 pr_cont("External"); 45 pciclk = -1; 46 } 47 pr_cont("\n"); 48 return pciclk; 49 } 50 51 int __init tx4927_pciclk66_setup(void) 52 { 53 int pciclk; 54 55 /* Assert M66EN */ 56 tx4927_ccfg_set(TX4927_CCFG_PCI66); 57 /* Double PCICLK (if possible) */ 58 if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) { 59 unsigned int pcidivmode = 0; 60 u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg); 61 pcidivmode = (unsigned long)ccfg & 62 TX4927_CCFG_PCIDIVMODE_MASK; 63 switch (pcidivmode) { 64 case TX4927_CCFG_PCIDIVMODE_5: 65 case TX4927_CCFG_PCIDIVMODE_2_5: 66 pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5; 67 pciclk = txx9_cpu_clock * 2 / 5; 68 break; 69 case TX4927_CCFG_PCIDIVMODE_6: 70 case TX4927_CCFG_PCIDIVMODE_3: 71 default: 72 pcidivmode = TX4927_CCFG_PCIDIVMODE_3; 73 pciclk = txx9_cpu_clock / 3; 74 } 75 tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK, 76 pcidivmode); 77 pr_debug("PCICLK: ccfg:%08lx\n", 78 (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg)); 79 } else 80 pciclk = -1; 81 return pciclk; 82 } 83 84 void __init tx4927_setup_pcierr_irq(void) 85 { 86 if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR, 87 tx4927_pcierr_interrupt, 88 0, "PCI error", 89 (void *)TX4927_PCIC_REG)) 90 pr_warn("Failed to request irq for PCIERR\n"); 91 } 92