2 * CBE Pervasive Monitor and Debug
4 * (C) Copyright IBM Corporation 2005
6 * Authors: Maximino Aguilar (maguilar@us.ibm.com)
7 * Michael N. Day (mnday@us.ibm.com)
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)
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.
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.
26 #include <linux/config.h>
27 #include <linux/interrupt.h>
28 #include <linux/irq.h>
29 #include <linux/percpu.h>
30 #include <linux/types.h>
31 #include <linux/kallsyms.h>
34 #include <asm/machdep.h>
36 #include <asm/pgtable.h>
39 #include "pervasive.h"
41 static DEFINE_SPINLOCK(cbe_pervasive_lock
);
42 struct cbe_pervasive
{
43 struct pmd_regs __iomem
*regs
;
47 /* can't use per_cpu from setup_arch */
48 static struct cbe_pervasive cbe_pervasive
[NR_CPUS
];
50 static void __init
cbe_enable_pause_zero(void)
52 unsigned long thread_switch_control
;
53 unsigned long temp_register
;
54 struct cbe_pervasive
*p
;
57 spin_lock_irq(&cbe_pervasive_lock
);
58 p
= &cbe_pervasive
[smp_processor_id()];
60 if (!cbe_pervasive
->regs
)
63 pr_debug("Power Management: CPU %d\n", smp_processor_id());
65 /* Enable Pause(0) control bit */
66 temp_register
= in_be64(&p
->regs
->pm_control
);
68 out_be64(&p
->regs
->pm_control
,
69 temp_register
|PMD_PAUSE_ZERO_CONTROL
);
71 /* Enable DEC and EE interrupt request */
72 thread_switch_control
= mfspr(SPRN_TSC_CELL
);
73 thread_switch_control
|= TSC_CELL_EE_ENABLE
| TSC_CELL_EE_BOOST
;
75 switch ((mfspr(SPRN_CTRLF
) & CTRL_CT
)) {
77 thread_switch_control
|= TSC_CELL_DEC_ENABLE_0
;
81 thread_switch_control
|= TSC_CELL_DEC_ENABLE_1
;
85 printk(KERN_WARNING
"%s: unknown configuration\n",
91 if (p
->thread
!= thread
)
92 printk(KERN_WARNING
"%s: device tree inconsistant, "
93 "cpu %i: %d/%d\n", __FUNCTION__
,
97 mtspr(SPRN_TSC_CELL
, thread_switch_control
);
100 spin_unlock_irq(&cbe_pervasive_lock
);
103 static void cbe_idle(void)
107 cbe_enable_pause_zero();
110 if (!need_resched()) {
112 while (!need_resched()) {
113 /* go into low thread priority */
117 * atomically disable thread execution
119 * External and Decrementer exceptions
120 * are still handled when the thread
121 * is disabled but now enter in
122 * cbe_system_reset_exception()
124 ctrl
= mfspr(SPRN_CTRLF
);
125 ctrl
&= ~(CTRL_RUNLATCH
| CTRL_TE
);
126 mtspr(SPRN_CTRLT
, ctrl
);
128 /* restore thread prio */
134 * turn runlatch on again before scheduling the
135 * process we just woke up
139 preempt_enable_no_resched();
145 int cbe_system_reset_exception(struct pt_regs
*regs
)
147 switch (regs
->msr
& SRR1_WAKEMASK
) {
152 timer_interrupt(regs
);
155 /* no action required */
158 /* do system reset */
161 /* everything handled */
165 static int __init
cbe_find_pmd_mmio(int cpu
, struct cbe_pervasive
*p
)
167 struct device_node
*node
;
168 unsigned int *int_servers
;
170 unsigned long real_address
;
173 struct pmd_regs __iomem
*pmd_mmio_area
;
177 pmd_mmio_area
= NULL
;
178 hardid
= get_hard_smp_processor_id(cpu
);
179 for (node
= NULL
; (node
= of_find_node_by_type(node
, "cpu"));) {
180 int_servers
= (void *) get_property(node
,
181 "ibm,ppc-interrupt-server#s", &proplen
);
183 printk(KERN_WARNING
"%s misses "
184 "ibm,ppc-interrupt-server#s property",
188 for (thread
= 0; thread
< proplen
/ sizeof (int); thread
++) {
189 if (hardid
== int_servers
[thread
]) {
190 addr
= get_property(node
, "pervasive", NULL
);
196 printk(KERN_WARNING
"%s: CPU %d not found\n", __FUNCTION__
, cpu
);
200 real_address
= *(unsigned long*) addr
;
201 addr
+= sizeof (unsigned long);
202 size
= *(unsigned int*) addr
;
204 pr_debug("pervasive area for CPU %d at %lx, size %x\n",
205 cpu
, real_address
, size
);
206 p
->regs
= __ioremap(real_address
, size
, _PAGE_NO_CACHE
);
211 void __init
cell_pervasive_init(void)
213 struct cbe_pervasive
*p
;
217 if (!cpu_has_feature(CPU_FTR_PAUSE_ZERO
))
221 p
= &cbe_pervasive
[cpu
];
222 ret
= cbe_find_pmd_mmio(cpu
, p
);
227 ppc_md
.idle_loop
= cbe_idle
;
228 ppc_md
.system_reset_exception
= cbe_system_reset_exception
;