1 /* 2 * CBE Pervasive Monitor and Debug 3 * 4 * (C) Copyright IBM Corporation 2005 5 * 6 * Authors: Maximino Aguilar (maguilar@us.ibm.com) 7 * Michael N. Day (mnday@us.ibm.com) 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #undef DEBUG 25 26 #include <linux/interrupt.h> 27 #include <linux/irq.h> 28 #include <linux/percpu.h> 29 #include <linux/types.h> 30 #include <linux/kallsyms.h> 31 32 #include <asm/io.h> 33 #include <asm/machdep.h> 34 #include <asm/prom.h> 35 #include <asm/pgtable.h> 36 #include <asm/reg.h> 37 38 #include "pervasive.h" 39 #include "cbe_regs.h" 40 41 static void cbe_power_save(void) 42 { 43 unsigned long ctrl, thread_switch_control; 44 ctrl = mfspr(SPRN_CTRLF); 45 46 /* Enable DEC and EE interrupt request */ 47 thread_switch_control = mfspr(SPRN_TSC_CELL); 48 thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST; 49 50 switch (ctrl & CTRL_CT) { 51 case CTRL_CT0: 52 thread_switch_control |= TSC_CELL_DEC_ENABLE_0; 53 break; 54 case CTRL_CT1: 55 thread_switch_control |= TSC_CELL_DEC_ENABLE_1; 56 break; 57 default: 58 printk(KERN_WARNING "%s: unknown configuration\n", 59 __FUNCTION__); 60 break; 61 } 62 mtspr(SPRN_TSC_CELL, thread_switch_control); 63 64 /* 65 * go into low thread priority, medium priority will be 66 * restored for us after wake-up. 67 */ 68 HMT_low(); 69 70 /* 71 * atomically disable thread execution and runlatch. 72 * External and Decrementer exceptions are still handled when the 73 * thread is disabled but now enter in cbe_system_reset_exception() 74 */ 75 ctrl &= ~(CTRL_RUNLATCH | CTRL_TE); 76 mtspr(SPRN_CTRLT, ctrl); 77 } 78 79 static int cbe_system_reset_exception(struct pt_regs *regs) 80 { 81 switch (regs->msr & SRR1_WAKEMASK) { 82 case SRR1_WAKEEE: 83 do_IRQ(regs); 84 break; 85 case SRR1_WAKEDEC: 86 timer_interrupt(regs); 87 break; 88 case SRR1_WAKEMT: 89 break; 90 #ifdef CONFIG_CBE_RAS 91 case SRR1_WAKESYSERR: 92 cbe_system_error_exception(regs); 93 break; 94 case SRR1_WAKETHERM: 95 cbe_thermal_exception(regs); 96 break; 97 #endif /* CONFIG_CBE_RAS */ 98 default: 99 /* do system reset */ 100 return 0; 101 } 102 /* everything handled */ 103 return 1; 104 } 105 106 void __init cbe_pervasive_init(void) 107 { 108 int cpu; 109 if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO)) 110 return; 111 112 for_each_possible_cpu(cpu) { 113 struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu); 114 if (!regs) 115 continue; 116 117 /* Enable Pause(0) control bit */ 118 out_be64(®s->pmcr, in_be64(®s->pmcr) | 119 CBE_PMD_PAUSE_ZERO_CONTROL); 120 } 121 122 ppc_md.power_save = cbe_power_save; 123 ppc_md.system_reset_exception = cbe_system_reset_exception; 124 } 125