116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
|
/*
|
||
|
|
* pervasive backend for the cbe_cpufreq driver
|
||
|
|
*
|
||
|
|
* This driver makes use of the pervasive unit to
|
||
|
|
* engage the desired frequency.
|
||
|
|
*
|
||
|
|
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
|
||
|
|
*
|
||
|
|
* Author: Christian Krafft <krafft@de.ibm.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
||
|
|
* any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/time.h>
|
||
|
|
#include <asm/machdep.h>
|
||
|
|
#include <asm/hw_irq.h>
|
||
|
|
#include <asm/cell-regs.h>
|
||
|
|
|
||
|
|
#include "cbe_cpufreq.h"
|
||
|
|
|
||
|
|
/* to write to MIC register */
|
||
|
|
static u64 MIC_Slow_Fast_Timer_table[] = {
|
||
|
|
[0 ... 7] = 0x007fc00000000000ull,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* more values for the MIC */
|
||
|
|
static u64 MIC_Slow_Next_Timer_table[] = {
|
||
|
|
0x0000240000000000ull,
|
||
|
|
0x0000268000000000ull,
|
||
|
|
0x000029C000000000ull,
|
||
|
|
0x00002D0000000000ull,
|
||
|
|
0x0000300000000000ull,
|
||
|
|
0x0000334000000000ull,
|
||
|
|
0x000039C000000000ull,
|
||
|
|
0x00003FC000000000ull,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode)
|
||
|
|
{
|
||
|
|
struct cbe_pmd_regs __iomem *pmd_regs;
|
||
|
|
struct cbe_mic_tm_regs __iomem *mic_tm_regs;
|
||
|
|
unsigned long flags;
|
||
|
|
u64 value;
|
||
|
|
#ifdef DEBUG
|
||
|
|
long time;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
local_irq_save(flags);
|
||
|
|
|
||
|
|
mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
|
||
|
|
pmd_regs = cbe_get_cpu_pmd_regs(cpu);
|
||
|
|
|
||
|
|
#ifdef DEBUG
|
||
|
|
time = jiffies;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
|
||
|
|
out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
|
||
|
|
|
||
|
|
out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
|
||
|
|
out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
|
||
|
|
|
||
|
|
value = in_be64(&pmd_regs->pmcr);
|
||
|
|
/* set bits to zero */
|
||
|
|
value &= 0xFFFFFFFFFFFFFFF8ull;
|
||
|
|
/* set bits to next pmode */
|
||
|
|
value |= pmode;
|
||
|
|
|
||
|
|
out_be64(&pmd_regs->pmcr, value);
|
||
|
|
|
||
|
|
#ifdef DEBUG
|
||
|
|
/* wait until new pmode appears in status register */
|
||
|
|
value = in_be64(&pmd_regs->pmsr) & 0x07;
|
||
|
|
while (value != pmode) {
|
||
|
|
cpu_relax();
|
||
|
|
value = in_be64(&pmd_regs->pmsr) & 0x07;
|
||
|
|
}
|
||
|
|
|
||
|
|
time = jiffies - time;
|
||
|
|
time = jiffies_to_msecs(time);
|
||
|
|
pr_debug("had to wait %lu ms for a transition using " \
|
||
|
|
"pervasive unit\n", time);
|
||
|
|
#endif
|
||
|
|
local_irq_restore(flags);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int cbe_cpufreq_get_pmode(int cpu)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct cbe_pmd_regs __iomem *pmd_regs;
|
||
|
|
|
||
|
|
pmd_regs = cbe_get_cpu_pmd_regs(cpu);
|
||
|
|
ret = in_be64(&pmd_regs->pmsr) & 0x07;
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|