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Arnd Bergmannc902be72006-01-04 19:55:53 +00001/*
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
Arnd Bergmannc902be72006-01-04 19:55:53 +000026#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>
Benjamin Herrenschmidteef686a02007-10-04 15:40:42 +100037#include <asm/cell-regs.h>
Arnd Bergmannc902be72006-01-04 19:55:53 +000038
39#include "pervasive.h"
40
Arnd Bergmann3addf552007-08-23 03:01:26 +100041static int sysreset_hack;
42
arnd@arndb.de302eca12006-10-24 18:31:26 +020043static void cbe_power_save(void)
Arnd Bergmannc902be72006-01-04 19:55:53 +000044{
arnd@arndb.de302eca12006-10-24 18:31:26 +020045 unsigned long ctrl, thread_switch_control;
Benjamin Herrenschmidt5850dd82006-11-23 00:46:38 +010046
47 /*
Benjamin Herrenschmidte1fa2e12007-05-10 22:22:45 -070048 * We need to hard disable interrupts, the local_irq_enable() done by
49 * our caller upon return will hard re-enable.
Benjamin Herrenschmidt5850dd82006-11-23 00:46:38 +010050 */
51 hard_irq_disable();
Benjamin Herrenschmidt5850dd82006-11-23 00:46:38 +010052
arnd@arndb.de302eca12006-10-24 18:31:26 +020053 ctrl = mfspr(SPRN_CTRLF);
Arnd Bergmannc902be72006-01-04 19:55:53 +000054
55 /* Enable DEC and EE interrupt request */
56 thread_switch_control = mfspr(SPRN_TSC_CELL);
57 thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;
58
arnd@arndb.de302eca12006-10-24 18:31:26 +020059 switch (ctrl & CTRL_CT) {
Arnd Bergmannc902be72006-01-04 19:55:53 +000060 case CTRL_CT0:
61 thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
Arnd Bergmannc902be72006-01-04 19:55:53 +000062 break;
63 case CTRL_CT1:
64 thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
Arnd Bergmannc902be72006-01-04 19:55:53 +000065 break;
66 default:
67 printk(KERN_WARNING "%s: unknown configuration\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +110068 __func__);
Arnd Bergmannc902be72006-01-04 19:55:53 +000069 break;
70 }
Arnd Bergmannc902be72006-01-04 19:55:53 +000071 mtspr(SPRN_TSC_CELL, thread_switch_control);
72
arnd@arndb.de302eca12006-10-24 18:31:26 +020073 /*
74 * go into low thread priority, medium priority will be
75 * restored for us after wake-up.
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +020076 */
arnd@arndb.de302eca12006-10-24 18:31:26 +020077 HMT_low();
Arnd Bergmannc902be72006-01-04 19:55:53 +000078
arnd@arndb.de302eca12006-10-24 18:31:26 +020079 /*
80 * atomically disable thread execution and runlatch.
81 * External and Decrementer exceptions are still handled when the
82 * thread is disabled but now enter in cbe_system_reset_exception()
83 */
84 ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
85 mtspr(SPRN_CTRLT, ctrl);
Arnd Bergmannc902be72006-01-04 19:55:53 +000086}
87
Arnd Bergmann8fce10a2006-01-11 23:07:11 +000088static int cbe_system_reset_exception(struct pt_regs *regs)
Arnd Bergmannc902be72006-01-04 19:55:53 +000089{
Arnd Bergmann3addf552007-08-23 03:01:26 +100090 int cpu;
91 struct cbe_pmd_regs __iomem *pmd;
92
Arnd Bergmannc902be72006-01-04 19:55:53 +000093 switch (regs->msr & SRR1_WAKEMASK) {
94 case SRR1_WAKEEE:
95 do_IRQ(regs);
96 break;
97 case SRR1_WAKEDEC:
98 timer_interrupt(regs);
99 break;
100 case SRR1_WAKEMT:
Arnd Bergmann3addf552007-08-23 03:01:26 +1000101 /*
102 * The BMC can inject user triggered system reset exceptions,
103 * but cannot set the system reset reason in srr1,
104 * so check an extra register here.
105 */
106 if (sysreset_hack && (cpu = smp_processor_id()) == 0) {
107 pmd = cbe_get_cpu_pmd_regs(cpu);
108 if (in_be64(&pmd->ras_esc_0) & 0xffff) {
109 out_be64(&pmd->ras_esc_0, 0);
110 return 0;
111 }
112 }
Arnd Bergmannc902be72006-01-04 19:55:53 +0000113 break;
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +0200114#ifdef CONFIG_CBE_RAS
115 case SRR1_WAKESYSERR:
116 cbe_system_error_exception(regs);
117 break;
118 case SRR1_WAKETHERM:
119 cbe_thermal_exception(regs);
120 break;
121#endif /* CONFIG_CBE_RAS */
Arnd Bergmannc902be72006-01-04 19:55:53 +0000122 default:
123 /* do system reset */
124 return 0;
125 }
126 /* everything handled */
127 return 1;
128}
129
Benjamin Herrenschmidtacf7d762006-06-19 20:33:16 +0200130void __init cbe_pervasive_init(void)
Arnd Bergmannc902be72006-01-04 19:55:53 +0000131{
arnd@arndb.de302eca12006-10-24 18:31:26 +0200132 int cpu;
Arnd Bergmann3addf552007-08-23 03:01:26 +1000133
Arnd Bergmannc902be72006-01-04 19:55:53 +0000134 if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
135 return;
136
Arnd Bergmann3addf552007-08-23 03:01:26 +1000137 sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
138
arnd@arndb.de302eca12006-10-24 18:31:26 +0200139 for_each_possible_cpu(cpu) {
140 struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu);
141 if (!regs)
142 continue;
143
144 /* Enable Pause(0) control bit */
145 out_be64(&regs->pmcr, in_be64(&regs->pmcr) |
146 CBE_PMD_PAUSE_ZERO_CONTROL);
Arnd Bergmann3addf552007-08-23 03:01:26 +1000147
148 /* Enable JTAG system-reset hack */
149 if (sysreset_hack)
150 out_be32(&regs->fir_mode_reg,
151 in_be32(&regs->fir_mode_reg) |
152 CBE_PMD_FIR_MODE_M8);
arnd@arndb.de302eca12006-10-24 18:31:26 +0200153 }
154
155 ppc_md.power_save = cbe_power_save;
Arnd Bergmannc902be72006-01-04 19:55:53 +0000156 ppc_md.system_reset_exception = cbe_system_reset_exception;
157}