* 12.5 MHz woo hoo!
@ 2008-08-15 21:36 Kevin Diggs
0 siblings, 0 replies; only message in thread
From: Kevin Diggs @ 2008-08-15 21:36 UTC (permalink / raw)
To: linuxppc-dev
[-- Attachment #1: Type: text/plain, Size: 1206 bytes --]
[root@PowerMac8600B root]# cat /proc/cpuinfo
processor : 0
cpu : 750GX
temperature : 1-76 C (uncalibrated)
clock : 200.000000MHz
revision : 2.3 (pvr 0008 0203)
bogomips : 24.96
timebase : 12500000 <-- 12.5 MHz exactly!!!
platform : PowerMac
model : Power Macintosh
machine : Power Macintosh
motherboard : AAPL,8500 MacRISC
detected as : 16 (PowerMac 8500/8600)
pmac flags : 00000000
pmac-generation : OldWorld
Hey, anybody know if that temperature, thermal thingy works well enough
to bother fooling with the code to produce a more valid value?
also:
[root@PowerMac8600B root]# alias tis
alias tis='cat /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state'
[root@PowerMac8600B root]# tis
250000 178419
300000 0
350000 0
400000 0
450000 0
500000 0
550000 0
600000 0
650000 0
700000 0
750000 0
800000 0
850000 0
900000 0
950000 0
1000000 0
[root@PowerMac8600B root]# uname -vr
2.6.26-pll #4 Thu Aug 14 04:02:58 PDT 2008
Finally, can someone tell me if the attached file shows up ok if it were
a patch I wanted to submit? I can't seem to figure out how to 'import
inline' using this ancient mailer.
kevin
[-- Attachment #2: pll_if.c --]
[-- Type: text/plain, Size: 20033 bytes --]
/*
* cf750gx.c - cpufreq driver for the dual PLLs in the 750gx
* ($Revision: 1.0 $)
*
* Copyright (C) 2008 kevin Diggs
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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 of the License, 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#define DEBUG
#include "linux/init.h"
#include "linux/module.h"
#include <linux/autoconf.h>
#include "linux/kernel.h"
#include <linux/errno.h>
#include <linux/cpu.h>
#include "linux/of.h"
#include "linux/notifier.h"
#include "linux/delay.h"
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_SYSFS
#include "linux/sysdev.h"
#endif
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_HRTIMER
#include "linux/hrtimer.h"
#endif
#include <asm/uaccess.h>
#include <asm/bitops.h>
#include "asm/time.h"
#include <asm/mmu.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/cputable.h>
#include <asm/system.h>
#include <asm/pll_if.h>
#include <asm/pll.h>
#include <asm/smp.h>
MODULE_LICENSE("GPL");
static unsigned int boot_ratio;
static unsigned int pllifvBusClock;
static unsigned int override_bus_clock = 0;
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_HRTIMER
static enum hrtimer_restart pllTimerF(struct hrtimer *hrt);
static struct hrtimer pll_timer;
static unsigned long hrtimers_got_no_freakin_callback_data;
#ifdef DEBUG
cycles_t pll_time_stamp;
#endif
#else
static void pllTimerF(unsigned long newPLL);
static struct timer_list pll_timer;
cycles_t pll_time_stamp;
#endif
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_SYSFS
extern unsigned long loops_per_jiffy;
unsigned long boot_loops;
static struct sys_device *sysdev_cpu;
static ssize_t show_ppc750gxpll(struct sys_device *dev, char *buf)
{
return sprintf(buf, "%x\n", get_PLL());
}
int modifyPLL(unsigned int pll, int scaleLPJ);
//static ssize_t __attribute_used__ store_ppc750gxpll(struct sys_device *dev,
// const char *buf, size_t count)
static ssize_t __used store_ppc750gxpll(struct sys_device *dev,
const char *buf, size_t count)
{
unsigned int pll;
char *ptr;
pr_debug(__FILE__">%s()-%d: buf=%s\n", __func__, __LINE__, buf);
pll = simple_strtoul(buf, &ptr, 16);
pr_debug(__FILE__">%s()-%d: %x (%d)\n", __func__, __LINE__, pll, pll);
/* modifyPLL(pll,!0); */
modifyPLL(pll, 0);
return ptr-buf;
}
static SYSDEV_ATTR(ppc750gxpll, 0600, show_ppc750gxpll, store_ppc750gxpll);
#endif
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_CPU_FREQ
struct plliftCallData {
void *data;
int scalar;
};
static struct plliftCallData pllifvSwitchCallData;
static struct plliftCallData pllifvLockCallData;
static RAW_NOTIFIER_HEAD(pllifvPllSwitchChain);
static RAW_NOTIFIER_HEAD(pllifvPllLockChain);
#endif
/*
* This initializes the code for the PLL control:
* boot_ratio is used to scale the loops_per_jiffy value from its boot value
* boot_loops is the boot value of loops_per_jiffy and is used to compute new
* values
*/
static int __init init_PLL(void)
{
unsigned int temp;
#ifdef CONFIG_PPC_OF
const u32 *clk;
struct device_node *tree_root;
#endif
if (!cpu_has_feature(CPU_FTR_DUAL_PLL_750FX))
return -ENODEV;
boot_ratio = 0;
/*
* See if bus clock override was specified
*/
if (override_bus_clock)
pllifvBusClock = override_bus_clock*1000;
#ifdef CONFIG_PPC_OF
/*
* If bus clock is not specified, try to get it via OF
*/
if (!pllifvBusClock) {
/*
* Get root node (aka MacRISC bus)
*/
tree_root = of_find_node_by_name(NULL, "");
if (tree_root) {
clk = of_get_property(tree_root, "clock-frequency",
NULL);
if (clk && *clk)
pllifvBusClock = (unsigned int) *clk;
of_node_put(tree_root);
pr_debug(__FILE__">%s()-%d: Bus clock from OF is %u\n",
__func__, __LINE__, pllifvBusClock);
}
}
#endif /* CONFIG_PPC_OF */
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_SYSFS
temp = get_PLL();
temp = get_PLL_ratio(get_active_PLL(temp), temp);
/*
* Units for boot ratio is halves, i.e. 20 is a ratio of 10.
* From 21 on the returned value needs to be converted to halves.
*/
if (temp > 20)
temp = (temp-10)<<1;
boot_ratio = temp;
boot_loops = loops_per_jiffy;
/*
* Try to get the cpu sysdev
*/
sysdev_cpu = get_cpu_sysdev(boot_cpuid);
if (sysdev_cpu != NULL)
sysdev_create_file(sysdev_cpu, &attr_ppc750gxpll);
#endif
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_HRTIMER
hrtimer_init(&pll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
#else
init_timer(&pll_timer);
#endif
pll_timer.function = pllTimerF;
return 0;
}
/*__initcall(init_PLL); */
static void exit_PLL(void)
{
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_SYSFS
if (sysdev_cpu != NULL)
sysdev_remove_file(sysdev_cpu, &attr_ppc750gxpll);
#endif
/*
* Make sure there are no timers pending by making sure we are not
* doing anything
*/
while (test_bit(PLL_LOCK_BIT, (unsigned long *)&boot_ratio))
msleep(1);
}
module_init(init_PLL);
module_exit(exit_PLL);
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_SYSFS
static unsigned long pllNewLPJ(unsigned int oldRatio, unsigned int newRatio,
unsigned long LPJ)
{
if (LPJ > 200000000)
return LPJ/oldRatio*newRatio;
else
return LPJ*newRatio/oldRatio;
}
static inline void pllUpdateLPJ(unsigned int oldRatio, unsigned int newRatio,
unsigned long LPJ)
{
loops_per_jiffy = pllNewLPJ(oldRatio, newRatio, LPJ);
}
#else
#define pllUpdateLPJ(a, b, c)
#endif
static void pllifiSwitchPLLs(unsigned int newPLL)
{
#if 0
unsigned long flags;
#endif
unsigned int new_ratio, new_ratio_cp, old_ratio, current_pll, masked_boot_ratio;
pr_debug(__FILE__">%s()-%d: newPLL=0x%08x\n", __func__, __LINE__, newPLL);
/*
* Compute new loops_per_jiffy
*/
current_pll = get_PLL();
new_ratio = get_PLL_ratio(get_next_PLL(newPLL), current_pll);
old_ratio = get_PLL_ratio(get_active_PLL(current_pll), current_pll);
masked_boot_ratio = boot_ratio&0xff;
new_ratio_cp = new_ratio;
pr_debug(__FILE__">%s()-%d: current_pll=0x%08x, new=%d, old=%d\n",
__func__, __LINE__, current_pll, new_ratio, old_ratio);
current_pll = (current_pll&~PLL_SEL_MASK)|(newPLL&PLL_SEL_MASK);
pr_debug(__FILE__">%s()-%d: current_pll=0x%08x, new=%d, old=%d\n",
__func__, __LINE__, current_pll, new_ratio, old_ratio);
/*
* Convert to halves
*/
if (new_ratio > 20)
new_ratio = (new_ratio-10)<<1;
if (old_ratio > 20)
old_ratio = (old_ratio-10)<<1;
/*
* Make sure that we never shorten the sleep values
*/
if (new_ratio > old_ratio) {
if (newPLL&PLL_DO_LPJ)
pllUpdateLPJ(masked_boot_ratio, new_ratio, boot_loops);
pr_debug(__FILE__">%s()-%d: masked_boot_ratio=%d, new_ratio="
"%d, boot_loops=%ld, loops_per_jiffy=%ld\n", __func__, __LINE__,
masked_boot_ratio, new_ratio, boot_loops, loops_per_jiffy);
set_PLL(current_pll);
} else {
pr_debug(__FILE__">%s()-%d: masked_boot_ratio=%d, new_"
"ratio=%d, boot_loops=%ld, loops_per_jiffy=%ld\n",
__func__, __LINE__, masked_boot_ratio, new_ratio,
boot_loops, loops_per_jiffy);
set_PLL(current_pll);
if (newPLL&PLL_DO_LPJ)
pllUpdateLPJ(masked_boot_ratio, new_ratio, boot_loops);
pr_debug(__FILE__">%s()-%d: masked_boot_ratio=%d, new_"
"ratio=%d, boot_loops=%ld, loops_per_jiffy=%ld\n",
__func__, __LINE__, masked_boot_ratio, new_ratio,
boot_loops, loops_per_jiffy);
}
raw_notifier_call_chain(&pllifvPllSwitchChain, pllifmPllSwitch,
pllifvSwitchCallData.data);
/*
* This is used to print the clock frequency in /proc/cpuinfo
*/
ppc_proc_freq = pllifCfgToFreq(new_ratio_cp);
pr_debug(__FILE__">%s()-%d: pllifCfgToFreq(%u)=%lu\n", __func__,
__LINE__, new_ratio_cp, ppc_proc_freq);
#if 0
save_flags(flags);
cli();
loops_per_jiffy = pllNewLPJ(masked_boot_ratio, new_ratio, boot_loops);
set_PLL(current_pll);
restore_flags(flags);
#endif
}
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_HRTIMER
static enum hrtimer_restart pllTimerF(struct hrtimer *hrt)
{
#ifdef DEBUG
cycles_t now;
cycles_t usec, tmp, cntlz, cnttz;
now = get_cycles();
now = now-pll_time_stamp;
/*
* Aw cmon, I'm just havin' a little fun with PPC assembly.
* Just wish I could find a way to use an rlwinm ...
*/
cnttz = tb_ticks_per_sec; /* needed to get the assembly to ...
* look right ... ??? */
tmp = now*15625;
__asm__ __volatile__ (
"addi %0,%3,-1\n"
"andc %1,%3,%0\n"
"cntlzw %1,%1\n"
"subfic %1,%1,31\n"
"cntlzw %0,%2\n":
"=r"(cntlz), "=r"(cnttz):
"r"(tmp), "b"(cnttz)
);
/*
* 1,000,000 usec per sec and 1,000,000 is 15625<<6
*/
usec = ((tmp<<cntlz)/(tb_ticks_per_sec>>cnttz))<<6;
usec = (usec+(1UL<<(cntlz+cnttz-1)))>>(cntlz+cnttz);
pr_debug(__FILE__">%s()-%d: Time delta is %lu cycles, "
"%lu uS (cntlz=%lu, cnttz=%lu)\n", __func__, __LINE__, now,
usec, cntlz, cnttz);
#endif
raw_notifier_call_chain(&pllifvPllLockChain, pllifmPllLock,
pllifvLockCallData.data);
/*
* Clear all lock bits
*/
boot_ratio &= ~(PLL_TIMER|PLL0_LOCK|PLL1_LOCK);
if ((unsigned int) hrtimers_got_no_freakin_callback_data)
pllifiSwitchPLLs((unsigned int)
hrtimers_got_no_freakin_callback_data);
return HRTIMER_NORESTART;
}
#else
static void pllTimerF(unsigned long newPLL)
{
cycles_t now;
now = get_cycles();
now = now-pll_time_stamp;
#ifdef DEBUG
{
cycles_t usec, tmp, cntlz, cnttz;
/*
* Aw cmon, I'm just havin' a little fun with PPC assembly.
* Just wish I could find a way to use an rlwinm ...
*/
cnttz = tb_ticks_per_sec; /* needed to get the assembly to ...
* look right ... ??? */
#define MULFIRST
#ifdef MULFIRST
tmp = now*15625;
#else
tmp = now;
#endif
__asm__ __volatile__ (
"addi %0,%3,-1\n"
"andc %1,%3,%0\n"
"cntlzw %1,%1\n"
"subfic %1,%1,31\n"
"cntlzw %0,%2\n":
"=r"(cntlz), "=r"(cnttz):
"r"(tmp), "b"(cnttz)
);
/*
* 1,000,000 usec per sec and 1,000,000 is 15625<<6
*/
// usec = (((now<<cntlz)/(tb_ticks_per_sec>>cnttz)*15625)+(1UL<<
// (cntlz+cnttz-1-6)))>>(cntlz+cnttz-6);
#ifdef MULFIRST
usec = ((tmp<<cntlz)/(tb_ticks_per_sec>>cnttz))<<6;
usec = (usec+(1UL<<(cntlz+cnttz-1)))>>(cntlz+cnttz);
#else
usec = ((tmp<<cntlz)/(tb_ticks_per_sec>>cnttz)*15625)<<6;
usec = (usec+(1UL<<(cntlz+cnttz-1)))>>(cntlz+cnttz);
#endif
pr_debug(__FILE__">%s()-%d: Time delta is %lu cycles, "
"%lu uS (cntlz=%lu, cnttz=%lu)\n", __func__, __LINE__,
now, usec, cntlz, cnttz);
}
#endif
/*
* Make sure it has been at least 100 usec. 100 usec is 100 *
* tb_ticks_per_sec / 1,000,000 cycles, so:
* if(now<100*tb_ticks_per_sec/1000000
* 1,000,000 is 15625<<6, so:
* if((now<<6)<100*tb_ticks_per_sec/15625)
* 100 is 25<<2, so:
* if((now<<4)<25*tb_ticks_per_sec/15625)
* 15625 is 3125*5, so:
* if((now<<4)*5<25*tb_ticks_per_sec/3125)
* obviously 25/3125 -> 1/125:
* if((now<<4)*5<tb_ticks_per_sec/125)
*/
if ((now<<4)*5 < tb_ticks_per_sec/125)
udelay(100-now*1000000/tb_ticks_per_sec);
raw_notifier_call_chain(&pllifvPllLockChain, pllifmPllLock,
pllifvLockCallData.data);
/*
* Clear all lock bits
*/
boot_ratio &= ~(PLL_TIMER|PLL0_LOCK|PLL1_LOCK);
if ((unsigned int)newPLL)
pllifiSwitchPLLs((unsigned int)newPLL);
}
#endif
/*
* Handle accesses to the pll register. Examples for write:
* value CFGx/RNGx/res effect
* 0x08010000 switch to PLL1
* 0x08000000 switch to PLL0
* 0xc000fa00 1111 1/01/0 PLL0 off (CFG/RNG 31/1)
* 0xc000f200 1111 0/01/0 PLL0 to 20x (CFG/RNG 30/1)
* 0x30000004 0000 0/10/0 PLL1 off (CFG/RNG 0/2)
* 0x30000054 0101 0/10/0 PLL1 to 5x (CFG/RNG a/2)
*/
/**
* modifyPLL: - Takes steps to modify PLL as requested
* @pll: Specifies the new value and desired operation to be performed
* @scaleLPJ: flag to indicate whether to scale the loops_per_jiffy value
*
* Based on the value passed in the pll argument, this takes the steps necessary
* to change the PLL as requested. The upper 7 or 8 bits of the PLL are read
* only. These bit positions in the pll argument are used to specify flags that
* indicate the validity of the other fields in the pll argument. See the
* pll_if.h header for detail and actual values.
*/
int modifyPLL(unsigned int pll, int scaleLPJ)
{
unsigned int current_pll, work_mask, pll_x;
int rval = 0;
pr_debug(__FILE__">%s()-%d:\n", __func__, __LINE__);
pr_debug(__FILE__">%s()-%d: pll=0x%08x\n", __func__, __LINE__, pll);
/*
* This is not reentrant
*/
if (test_and_set_bit(PLL_LOCK_BIT, (unsigned long *)&boot_ratio)) {
pr_debug(__FILE__">%s()-%d: Busy!\n", __func__, __LINE__);
return -EAGAIN;
}
/*
* Don't allow any changes if a timer is pending
*/
if (test_bit(PLL_TIMER_BIT, (unsigned long *)&boot_ratio))
goto checkPLLBusy;
current_pll = get_PLL();
work_mask = pll>>24;
/*
* Check to see if the currently selected PLL is being modified
*/
pll_x = get_active_PLL(current_pll);
if ((pll_x == 0 && work_mask&(PLL0_DO_CFG|PLL0_DO_RNG|PLL0_DO_CONTROL))
|| (pll_x == 1 && work_mask&(PLL1_DO_CFG|PLL1_DO_RNG)))
goto checkPLLInVal;
/*
* Can't change to a PLL that is off. Also can't immediately change to
* one that is not locked. Catch that supposedly impossible condition.
*/
if (work_mask&PLL_DO_SEL) {
int next_ratio;
unsigned int which_config;
pll_x = get_next_PLL(pll);
/*
* Figure out where the next ratio comes from. It will be from
* pll if we are changing the next pll and current_pll if not.
*/
which_config = pll_x?((work_mask&PLL1_DO_CFG)?pll:current_pll):
((work_mask&PLL0_DO_CFG)?pll:current_pll);
next_ratio = get_PLL_ratio(pll_x, which_config);
if (next_ratio < 4 || next_ratio > 30)
goto checkPLLInVal;
pll_x = ((pll_x == 0 && boot_ratio&PLL0_LOCK) || (pll_x == 1 &&
boot_ratio&PLL1_LOCK))?1:0;
}
/*
* To avoid complications, don't allow both plls to be half ratios
*/
if (work_mask&PLL0_DO_CFG) {
int old_ratio1, new_ratio0;
old_ratio1 = get_PLL_ratio(1, current_pll);
new_ratio0 = get_PLL_ratio(0, pll);
if (old_ratio1 > 4 && old_ratio1 < 20 && new_ratio0 > 4 &&
new_ratio0 < 20 && (old_ratio1&0x1) & (new_ratio0&0x1))
goto checkPLLInVal;
} else if (work_mask&PLL1_DO_CFG) {
int old_ratio0, new_ratio1;
old_ratio0 = get_PLL_ratio(0, current_pll);
new_ratio1 = get_PLL_ratio(1, pll);
if (old_ratio0 > 4 && old_ratio0 < 20 && new_ratio1 > 4 &&
new_ratio1 < 20 && (old_ratio0&0x1) & (new_ratio1&0x1))
goto checkPLLInVal;
}
/*
* Determine if we will need to schedule a timer for a PLL relock. If
* any PLL config is being changed then a timer will be needed. Also
* need one if changing to a PLL that is not locked, though that should
* not happen.
*/
if ((work_mask&(PLL0_DO_CFG|PLL0_DO_RNG|PLL1_DO_CFG|PLL1_DO_RNG|
PLL0_DO_CONTROL)) || (work_mask&PLL_DO_SEL && pll_x)) {
unsigned int pll_mask, temp;
pll_mask = 0;
if (work_mask&PLL0_DO_CFG) {
pll_mask |= PLL0_CFG_MASK;
/*
* Flag that PLL0 needs to relock
*/
boot_ratio |= PLL0_LOCK;
}
if (work_mask&PLL0_DO_RNG)
pll_mask |= PLL0_RNG_MASK;
if (work_mask&PLL1_DO_CFG) {
pll_mask |= PLL1_CFG_MASK;
/*
* Flag that PLL1 needs to relock
*/
boot_ratio |= PLL1_LOCK;
}
if (work_mask&PLL1_DO_RNG)
pll_mask |= PLL1_RNG_MASK;
temp = (current_pll&~pll_mask)|(pll&pll_mask);
if (pll_mask)
set_PLL(temp);
/*
* Flag that a timer is pending
*/
boot_ratio |= PLL_TIMER;
/*
* Schedule a timer to clear the PLL lock bits (and signal that
* it is ok to select the PLL)
*/
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_HRTIMER
/*
* Oh please, someone tell me I'm just to stupid to know how
* to pass this to the timer function!
*/
hrtimers_got_no_freakin_callback_data = (work_mask&PLL_DO_SEL)?
(PLL_DO_SEL<<24)|(scaleLPJ?PLL_DO_LPJ:0)|pll&
PLL_SEL_MASK:0;
pll_timer.expires = ktime_set(0, 100000);
hrtimer_start(&pll_timer, pll_timer.expires, HRTIMER_MODE_REL);
#ifdef DEBUG
pll_time_stamp = get_cycles();
#endif
#else
/*
* We might want to pass three pieces of data to the timer
* i) that we want to switch PLLs (PLL_DO_SEL)
* ii) which PLL to switch to (PLL_SEL_MASK)
* iii) flag to control whether loops_per_jiffy is updated
* (PLL_DO_LPJ)
*/
pll_timer.data = (work_mask&PLL_DO_SEL)?(PLL_DO_SEL<<24)|(
scaleLPJ?PLL_DO_LPJ:0)|(pll&PLL_SEL_MASK):0;
/*
* Relock takes 100 us. See how many jiffies will take care of
* it.
*/
pll_timer.expires = (100*HZ/1000000);
if (pll_timer.expires == 0)
pll_timer.expires = 1;
pll_timer.expires = jiffies+pll_timer.expires;
add_timer(&pll_timer);
pll_time_stamp = get_cycles();
#endif
} else if (work_mask&PLL_DO_SEL)
pllifiSwitchPLLs(pll|(scaleLPJ?PLL_DO_LPJ:0));
checkPLLOut:
clear_bit(PLL_LOCK_BIT, (unsigned long *)&boot_ratio);
return rval;
checkPLLBusy:
rval = -EBUSY;
goto checkPLLOut;
checkPLLInVal:
rval = -EINVAL;
goto checkPLLOut;
}
EXPORT_SYMBOL(modifyPLL);
/**
* pllifCFgToFreq: - Takes a ratio and returns the frequency
* @cfg: The PLL ratio field value
*
* This takes a PLL ratio field value and uses it along with the bus frequency
* to compute the processor frequency.
*/
unsigned int pllifCfgToFreq(unsigned int cfg)
{
return (cfg < 21?cfg>>1:cfg-10)*pllifvBusClock;
}
EXPORT_SYMBOL(pllifCfgToFreq);
#ifdef CONFIG_PPC_750GX_DUAL_PLL_IF_CPU_FREQ
/**
* pllifGetBusClock: - Returns the bus frequency
*
* This returns the determined bus frequency in Hz.
*/
unsigned int pllifGetBusClock()
{
return pllifvBusClock;
}
EXPORT_SYMBOL(pllifGetBusClock);
/**
* pllifRegisterPllSwitchCB: - Registers a pll switch call back
* @nb: structure describing the call back to register
*
* This registers a call back function that will be called when the clock is
* switched from one PLL to the other.
*/
int pllifRegisterPllSwitchCB(struct notifier_block *nb)
{
int ret;
pllifvSwitchCallData.data = (void *)nb->next;
nb->next = NULL;
pllifvSwitchCallData.scalar = nb->priority;
nb->priority = 0;
ret = raw_notifier_chain_register(&pllifvPllSwitchChain, nb);
return ret;
}
EXPORT_SYMBOL(pllifRegisterPllSwitchCB);
/**
* pllifUnregisterPllSwitchCB: - Cancels a previously registered call back
* @nb: structure describing the call back to cancel
*
* This cancels a previously registered switch call back
*/
void pllifUnregisterPllSwitchCB(struct notifier_block *nb)
{
raw_notifier_chain_unregister(&pllifvPllSwitchChain, nb);
}
EXPORT_SYMBOL(pllifUnregisterPllSwitchCB);
/**
* pllifRegisterPllLockCB: - Registers a pll lock call back
* @nb: structure describing the call back to register
*
* This registers a call back function that will be called when a PLL has
* locked to a new frequency.
*/
int pllifRegisterPllLockCB(struct notifier_block *nb)
{
int ret;
pllifvLockCallData.data = (void *)nb->next;
nb->next = NULL;
pllifvLockCallData.scalar = nb->priority;
nb->priority = 0;
ret = raw_notifier_chain_register(&pllifvPllLockChain, nb);
return ret;
}
EXPORT_SYMBOL(pllifRegisterPllLockCB);
/**
* pllifUnregisterPllLockCB: - Cancels a previously registered call back
* @nb: structure describing the call back to cancel
*
* This cancels a previously registered PLL lock call back
*/
void pllifUnregisterPllLockCB(struct notifier_block *nb)
{
raw_notifier_chain_unregister(&pllifvPllLockChain, nb);
}
EXPORT_SYMBOL(pllifUnregisterPllLockCB);
#endif
module_param(override_bus_clock, uint, 0644);
MODULE_PARM_DESC(override_bus_clock,
"Bus clock frequency in KHz used to compute core clock frequency from"
" bus ratios.");
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2008-08-15 21:36 12.5 MHz woo hoo! Kevin Diggs
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