1c902be71SArnd Bergmann /* 2c902be71SArnd Bergmann * CBE Pervasive Monitor and Debug 3c902be71SArnd Bergmann * 4c902be71SArnd Bergmann * (C) Copyright IBM Corporation 2005 5c902be71SArnd Bergmann * 6c902be71SArnd Bergmann * Authors: Maximino Aguilar (maguilar@us.ibm.com) 7c902be71SArnd Bergmann * Michael N. Day (mnday@us.ibm.com) 8c902be71SArnd Bergmann * 9c902be71SArnd Bergmann * This program is free software; you can redistribute it and/or modify 10c902be71SArnd Bergmann * it under the terms of the GNU General Public License as published by 11c902be71SArnd Bergmann * the Free Software Foundation; either version 2, or (at your option) 12c902be71SArnd Bergmann * any later version. 13c902be71SArnd Bergmann * 14c902be71SArnd Bergmann * This program is distributed in the hope that it will be useful, 15c902be71SArnd Bergmann * but WITHOUT ANY WARRANTY; without even the implied warranty of 16c902be71SArnd Bergmann * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17c902be71SArnd Bergmann * GNU General Public License for more details. 18c902be71SArnd Bergmann * 19c902be71SArnd Bergmann * You should have received a copy of the GNU General Public License 20c902be71SArnd Bergmann * along with this program; if not, write to the Free Software 21c902be71SArnd Bergmann * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22c902be71SArnd Bergmann */ 23c902be71SArnd Bergmann 24c902be71SArnd Bergmann #undef DEBUG 25c902be71SArnd Bergmann 26c902be71SArnd Bergmann #include <linux/interrupt.h> 27c902be71SArnd Bergmann #include <linux/irq.h> 28c902be71SArnd Bergmann #include <linux/percpu.h> 29c902be71SArnd Bergmann #include <linux/types.h> 30c902be71SArnd Bergmann #include <linux/kallsyms.h> 31c902be71SArnd Bergmann 32c902be71SArnd Bergmann #include <asm/io.h> 33c902be71SArnd Bergmann #include <asm/machdep.h> 34c902be71SArnd Bergmann #include <asm/prom.h> 35c902be71SArnd Bergmann #include <asm/pgtable.h> 36c902be71SArnd Bergmann #include <asm/reg.h> 37c902be71SArnd Bergmann 38c902be71SArnd Bergmann #include "pervasive.h" 39acf7d768SBenjamin Herrenschmidt #include "cbe_regs.h" 40c902be71SArnd Bergmann 41302eca18Sarnd@arndb.de static void cbe_power_save(void) 42c902be71SArnd Bergmann { 43302eca18Sarnd@arndb.de unsigned long ctrl, thread_switch_control; 44302eca18Sarnd@arndb.de ctrl = mfspr(SPRN_CTRLF); 45c902be71SArnd Bergmann 46c902be71SArnd Bergmann /* Enable DEC and EE interrupt request */ 47c902be71SArnd Bergmann thread_switch_control = mfspr(SPRN_TSC_CELL); 48c902be71SArnd Bergmann thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST; 49c902be71SArnd Bergmann 50302eca18Sarnd@arndb.de switch (ctrl & CTRL_CT) { 51c902be71SArnd Bergmann case CTRL_CT0: 52c902be71SArnd Bergmann thread_switch_control |= TSC_CELL_DEC_ENABLE_0; 53c902be71SArnd Bergmann break; 54c902be71SArnd Bergmann case CTRL_CT1: 55c902be71SArnd Bergmann thread_switch_control |= TSC_CELL_DEC_ENABLE_1; 56c902be71SArnd Bergmann break; 57c902be71SArnd Bergmann default: 58c902be71SArnd Bergmann printk(KERN_WARNING "%s: unknown configuration\n", 59c902be71SArnd Bergmann __FUNCTION__); 60c902be71SArnd Bergmann break; 61c902be71SArnd Bergmann } 62c902be71SArnd Bergmann mtspr(SPRN_TSC_CELL, thread_switch_control); 63c902be71SArnd Bergmann 64302eca18Sarnd@arndb.de /* 65302eca18Sarnd@arndb.de * go into low thread priority, medium priority will be 66302eca18Sarnd@arndb.de * restored for us after wake-up. 67acf7d768SBenjamin Herrenschmidt */ 68c902be71SArnd Bergmann HMT_low(); 69c902be71SArnd Bergmann 70c902be71SArnd Bergmann /* 71302eca18Sarnd@arndb.de * atomically disable thread execution and runlatch. 72302eca18Sarnd@arndb.de * External and Decrementer exceptions are still handled when the 73302eca18Sarnd@arndb.de * thread is disabled but now enter in cbe_system_reset_exception() 74c902be71SArnd Bergmann */ 75c902be71SArnd Bergmann ctrl &= ~(CTRL_RUNLATCH | CTRL_TE); 76c902be71SArnd Bergmann mtspr(SPRN_CTRLT, ctrl); 77c902be71SArnd Bergmann } 78c902be71SArnd Bergmann 798fce10a3SArnd Bergmann static int cbe_system_reset_exception(struct pt_regs *regs) 80c902be71SArnd Bergmann { 81c902be71SArnd Bergmann switch (regs->msr & SRR1_WAKEMASK) { 82c902be71SArnd Bergmann case SRR1_WAKEEE: 83c902be71SArnd Bergmann do_IRQ(regs); 84c902be71SArnd Bergmann break; 85c902be71SArnd Bergmann case SRR1_WAKEDEC: 86c902be71SArnd Bergmann timer_interrupt(regs); 87c902be71SArnd Bergmann break; 88c902be71SArnd Bergmann case SRR1_WAKEMT: 89c902be71SArnd Bergmann break; 90acf7d768SBenjamin Herrenschmidt #ifdef CONFIG_CBE_RAS 91acf7d768SBenjamin Herrenschmidt case SRR1_WAKESYSERR: 92acf7d768SBenjamin Herrenschmidt cbe_system_error_exception(regs); 93acf7d768SBenjamin Herrenschmidt break; 94acf7d768SBenjamin Herrenschmidt case SRR1_WAKETHERM: 95acf7d768SBenjamin Herrenschmidt cbe_thermal_exception(regs); 96acf7d768SBenjamin Herrenschmidt break; 97acf7d768SBenjamin Herrenschmidt #endif /* CONFIG_CBE_RAS */ 98c902be71SArnd Bergmann default: 99c902be71SArnd Bergmann /* do system reset */ 100c902be71SArnd Bergmann return 0; 101c902be71SArnd Bergmann } 102c902be71SArnd Bergmann /* everything handled */ 103c902be71SArnd Bergmann return 1; 104c902be71SArnd Bergmann } 105c902be71SArnd Bergmann 106acf7d768SBenjamin Herrenschmidt void __init cbe_pervasive_init(void) 107c902be71SArnd Bergmann { 108302eca18Sarnd@arndb.de int cpu; 109c902be71SArnd Bergmann if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO)) 110c902be71SArnd Bergmann return; 111c902be71SArnd Bergmann 112302eca18Sarnd@arndb.de for_each_possible_cpu(cpu) { 113302eca18Sarnd@arndb.de struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu); 114302eca18Sarnd@arndb.de if (!regs) 115302eca18Sarnd@arndb.de continue; 116302eca18Sarnd@arndb.de 117302eca18Sarnd@arndb.de /* Enable Pause(0) control bit */ 118302eca18Sarnd@arndb.de out_be64(®s->pmcr, in_be64(®s->pmcr) | 119302eca18Sarnd@arndb.de CBE_PMD_PAUSE_ZERO_CONTROL); 120302eca18Sarnd@arndb.de } 121302eca18Sarnd@arndb.de 122302eca18Sarnd@arndb.de ppc_md.power_save = cbe_power_save; 123c902be71SArnd Bergmann ppc_md.system_reset_exception = cbe_system_reset_exception; 124c902be71SArnd Bergmann } 125