Merge branch 'for-linus' of git://repo.or.cz/cris-mirror
[linux-2.6] / arch / powerpc / platforms / cell / pervasive.c
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 #include <asm/cell-regs.h>
38
39 #include "pervasive.h"
40
41 static void cbe_power_save(void)
42 {
43         unsigned long ctrl, thread_switch_control;
44
45         /*
46          * We need to hard disable interrupts, the local_irq_enable() done by
47          * our caller upon return will hard re-enable.
48          */
49         hard_irq_disable();
50
51         ctrl = mfspr(SPRN_CTRLF);
52
53         /* Enable DEC and EE interrupt request */
54         thread_switch_control  = mfspr(SPRN_TSC_CELL);
55         thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;
56
57         switch (ctrl & CTRL_CT) {
58         case CTRL_CT0:
59                 thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
60                 break;
61         case CTRL_CT1:
62                 thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
63                 break;
64         default:
65                 printk(KERN_WARNING "%s: unknown configuration\n",
66                         __func__);
67                 break;
68         }
69         mtspr(SPRN_TSC_CELL, thread_switch_control);
70
71         /*
72          * go into low thread priority, medium priority will be
73          * restored for us after wake-up.
74          */
75         HMT_low();
76
77         /*
78          * atomically disable thread execution and runlatch.
79          * External and Decrementer exceptions are still handled when the
80          * thread is disabled but now enter in cbe_system_reset_exception()
81          */
82         ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
83         mtspr(SPRN_CTRLT, ctrl);
84 }
85
86 static int cbe_system_reset_exception(struct pt_regs *regs)
87 {
88         switch (regs->msr & SRR1_WAKEMASK) {
89         case SRR1_WAKEEE:
90                 do_IRQ(regs);
91                 break;
92         case SRR1_WAKEDEC:
93                 timer_interrupt(regs);
94                 break;
95         case SRR1_WAKEMT:
96                 return cbe_sysreset_hack();
97 #ifdef CONFIG_CBE_RAS
98         case SRR1_WAKESYSERR:
99                 cbe_system_error_exception(regs);
100                 break;
101         case SRR1_WAKETHERM:
102                 cbe_thermal_exception(regs);
103                 break;
104 #endif /* CONFIG_CBE_RAS */
105         default:
106                 /* do system reset */
107                 return 0;
108         }
109         /* everything handled */
110         return 1;
111 }
112
113 void __init cbe_pervasive_init(void)
114 {
115         int cpu;
116
117         if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
118                 return;
119
120         for_each_possible_cpu(cpu) {
121                 struct cbe_pmd_regs __iomem *regs = cbe_get_cpu_pmd_regs(cpu);
122                 if (!regs)
123                         continue;
124
125                  /* Enable Pause(0) control bit */
126                 out_be64(&regs->pmcr, in_be64(&regs->pmcr) |
127                                             CBE_PMD_PAUSE_ZERO_CONTROL);
128         }
129
130         ppc_md.power_save = cbe_power_save;
131         ppc_md.system_reset_exception = cbe_system_reset_exception;
132 }