Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6
[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 int sysreset_hack;
42
43 static void cbe_power_save(void)
44 {
45         unsigned long ctrl, thread_switch_control;
46
47         /*
48          * We need to hard disable interrupts, the local_irq_enable() done by
49          * our caller upon return will hard re-enable.
50          */
51         hard_irq_disable();
52
53         ctrl = mfspr(SPRN_CTRLF);
54
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
59         switch (ctrl & CTRL_CT) {
60         case CTRL_CT0:
61                 thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
62                 break;
63         case CTRL_CT1:
64                 thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
65                 break;
66         default:
67                 printk(KERN_WARNING "%s: unknown configuration\n",
68                         __FUNCTION__);
69                 break;
70         }
71         mtspr(SPRN_TSC_CELL, thread_switch_control);
72
73         /*
74          * go into low thread priority, medium priority will be
75          * restored for us after wake-up.
76          */
77         HMT_low();
78
79         /*
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);
86 }
87
88 static int cbe_system_reset_exception(struct pt_regs *regs)
89 {
90         int cpu;
91         struct cbe_pmd_regs __iomem *pmd;
92
93         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:
101                 /*
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                 }
113                 break;
114 #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 */
122         default:
123                 /* do system reset */
124                 return 0;
125         }
126         /* everything handled */
127         return 1;
128 }
129
130 void __init cbe_pervasive_init(void)
131 {
132         int cpu;
133
134         if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO))
135                 return;
136
137         sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
138
139         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);
147
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);
153         }
154
155         ppc_md.power_save = cbe_power_save;
156         ppc_md.system_reset_exception = cbe_system_reset_exception;
157 }