linux/drivers/cpufreq/pmac32-cpufreq.c

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/*
* Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
* Copyright (C) 2004 John Steele Scott <toojays@toojays.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* TODO: Need a big cleanup here. Basically, we need to have different
* cpufreq_driver structures for the different type of HW instead of the
* current mess. We also need to better deal with the detection of the
* type of machine.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/cpufreq.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/hardirq.h>
#include <linux/of_device.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/pmac_feature.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/cputable.h>
#include <asm/time.h>
#include <asm/mpic.h>
#include <asm/keylargo.h>
#include <asm/switch_to.h>
/* WARNING !!! This will cause calibrate_delay() to be called,
* but this is an __init function ! So you MUST go edit
* init/main.c to make it non-init before enabling DEBUG_FREQ
*/
#undef DEBUG_FREQ
extern void low_choose_7447a_dfs(int dfs);
extern void low_choose_750fx_pll(int pll);
extern void low_sleep_handler(void);
/*
* Currently, PowerMac cpufreq supports only high & low frequencies
* that are set by the firmware
*/
static unsigned int low_freq;
static unsigned int hi_freq;
static unsigned int cur_freq;
static unsigned int sleep_freq;
static unsigned long transition_latency;
/*
* Different models uses different mechanisms to switch the frequency
*/
static int (*set_speed_proc)(int low_speed);
static unsigned int (*get_speed_proc)(void);
/*
* Some definitions used by the various speedprocs
*/
static u32 voltage_gpio;
static u32 frequency_gpio;
static u32 slew_done_gpio;
static int no_schedule;
static int has_cpu_l2lve;
static int is_pmu_based;
/* There are only two frequency states for each processor. Values
* are in kHz for the time being.
*/
#define CPUFREQ_HIGH 0
#define CPUFREQ_LOW 1
static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
{0, CPUFREQ_HIGH, 0},
{0, CPUFREQ_LOW, 0},
{0, 0, CPUFREQ_TABLE_END},
};
static inline void local_delay(unsigned long ms)
{
if (no_schedule)
mdelay(ms);
else
msleep(ms);
}
#ifdef DEBUG_FREQ
static inline void debug_calc_bogomips(void)
{
/* This will cause a recalc of bogomips and display the
* result. We backup/restore the value to avoid affecting the
* core cpufreq framework's own calculation.
*/
unsigned long save_lpj = loops_per_jiffy;
calibrate_delay();
loops_per_jiffy = save_lpj;
}
#endif /* DEBUG_FREQ */
/* Switch CPU speed under 750FX CPU control
*/
static int cpu_750fx_cpu_speed(int low_speed)
{
u32 hid2;
if (low_speed == 0) {
/* ramping up, set voltage first */
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
/* Make sure we sleep for at least 1ms */
local_delay(10);
/* tweak L2 for high voltage */
if (has_cpu_l2lve) {
hid2 = mfspr(SPRN_HID2);
hid2 &= ~0x2000;
mtspr(SPRN_HID2, hid2);
}
}
#ifdef CONFIG_6xx
low_choose_750fx_pll(low_speed);
#endif
if (low_speed == 1) {
/* tweak L2 for low voltage */
if (has_cpu_l2lve) {
hid2 = mfspr(SPRN_HID2);
hid2 |= 0x2000;
mtspr(SPRN_HID2, hid2);
}
/* ramping down, set voltage last */
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
local_delay(10);
}
return 0;
}
static unsigned int cpu_750fx_get_cpu_speed(void)
{
if (mfspr(SPRN_HID1) & HID1_PS)
return low_freq;
else
return hi_freq;
}
/* Switch CPU speed using DFS */
static int dfs_set_cpu_speed(int low_speed)
{
if (low_speed == 0) {
/* ramping up, set voltage first */
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
/* Make sure we sleep for at least 1ms */
local_delay(1);
}
/* set frequency */
#ifdef CONFIG_6xx
low_choose_7447a_dfs(low_speed);
#endif
udelay(100);
if (low_speed == 1) {
/* ramping down, set voltage last */
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
local_delay(1);
}
return 0;
}
static unsigned int dfs_get_cpu_speed(void)
{
if (mfspr(SPRN_HID1) & HID1_DFS)
return low_freq;
else
return hi_freq;
}
/* Switch CPU speed using slewing GPIOs
*/
static int gpios_set_cpu_speed(int low_speed)
{
int gpio, timeout = 0;
/* If ramping up, set voltage first */
if (low_speed == 0) {
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
/* Delay is way too big but it's ok, we schedule */
local_delay(10);
}
/* Set frequency */
gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
if (low_speed == ((gpio & 0x01) == 0))
goto skip;
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
low_speed ? 0x04 : 0x05);
udelay(200);
do {
if (++timeout > 100)
break;
local_delay(1);
gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
} while((gpio & 0x02) == 0);
skip:
/* If ramping down, set voltage last */
if (low_speed == 1) {
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
/* Delay is way too big but it's ok, we schedule */
local_delay(10);
}
#ifdef DEBUG_FREQ
debug_calc_bogomips();
#endif
return 0;
}
/* Switch CPU speed under PMU control
*/
static int pmu_set_cpu_speed(int low_speed)
{
struct adb_request req;
unsigned long save_l2cr;
unsigned long save_l3cr;
unsigned int pic_prio;
unsigned long flags;
preempt_disable();
#ifdef DEBUG_FREQ
printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
#endif
pmu_suspend();
/* Disable all interrupt sources on openpic */
pic_prio = mpic_cpu_get_priority();
mpic_cpu_set_priority(0xf);
/* Make sure the decrementer won't interrupt us */
asm volatile("mtdec %0" : : "r" (0x7fffffff));
/* Make sure any pending DEC interrupt occurring while we did
* the above didn't re-enable the DEC */
mb();
asm volatile("mtdec %0" : : "r" (0x7fffffff));
/* We can now disable MSR_EE */
local_irq_save(flags);
/* Giveup the FPU & vec */
enable_kernel_fp();
#ifdef CONFIG_ALTIVEC
if (cpu_has_feature(CPU_FTR_ALTIVEC))
enable_kernel_altivec();
#endif /* CONFIG_ALTIVEC */
/* Save & disable L2 and L3 caches */
save_l3cr = _get_L3CR(); /* (returns -1 if not available) */
save_l2cr = _get_L2CR(); /* (returns -1 if not available) */
/* Send the new speed command. My assumption is that this command
* will cause PLL_CFG[0..3] to be changed next time CPU goes to sleep
*/
pmu_request(&req, NULL, 6, PMU_CPU_SPEED, 'W', 'O', 'O', 'F', low_speed);
while (!req.complete)
pmu_poll();
/* Prepare the northbridge for the speed transition */
pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,1);
/* Call low level code to backup CPU state and recover from
* hardware reset
*/
low_sleep_handler();
/* Restore the northbridge */
pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,1,0);
/* Restore L2 cache */
if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
_set_L2CR(save_l2cr);
/* Restore L3 cache */
if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
_set_L3CR(save_l3cr);
/* Restore userland MMU context */
switch_mmu_context(NULL, current->active_mm, NULL);
#ifdef DEBUG_FREQ
printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
#endif
/* Restore low level PMU operations */
pmu_unlock();
/*
* Restore decrementer; we'll take a decrementer interrupt
* as soon as interrupts are re-enabled and the generic
* clockevents code will reprogram it with the right value.
*/
set_dec(1);
/* Restore interrupts */
mpic_cpu_set_priority(pic_prio);
/* Let interrupts flow again ... */
local_irq_restore(flags);
#ifdef DEBUG_FREQ
debug_calc_bogomips();
#endif
pmu_resume();
preempt_enable();
return 0;
}
static int do_set_cpu_speed(struct cpufreq_policy *policy, int speed_mode)
{
unsigned long l3cr;
static unsigned long prev_l3cr;
if (speed_mode == CPUFREQ_LOW &&
cpu_has_feature(CPU_FTR_L3CR)) {
l3cr = _get_L3CR();
if (l3cr & L3CR_L3E) {
prev_l3cr = l3cr;
_set_L3CR(0);
}
}
set_speed_proc(speed_mode == CPUFREQ_LOW);
if (speed_mode == CPUFREQ_HIGH &&
cpu_has_feature(CPU_FTR_L3CR)) {
l3cr = _get_L3CR();
if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
_set_L3CR(prev_l3cr);
}
cur_freq = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
return 0;
}
static unsigned int pmac_cpufreq_get_speed(unsigned int cpu)
{
return cur_freq;
}
static int pmac_cpufreq_target( struct cpufreq_policy *policy,
cpufreq: Implement light weight ->target_index() routine Currently, the prototype of cpufreq_drivers target routines is: int target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation); And most of the drivers call cpufreq_frequency_table_target() to get a valid index of their frequency table which is closest to the target_freq. And they don't use target_freq and relation after that. So, it makes sense to just do this work in cpufreq core before calling cpufreq_frequency_table_target() and simply pass index instead. But this can be done only with drivers which expose their frequency table with cpufreq core. For others we need to stick with the old prototype of target() until those drivers are converted to expose frequency tables. This patch implements the new light weight prototype for target_index() routine. It looks like this: int target_index(struct cpufreq_policy *policy, unsigned int index); CPUFreq core will call cpufreq_frequency_table_target() before calling this routine and pass index to it. Because CPUFreq core now requires to call routines present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time. This also marks target() interface as deprecated. So, that new drivers avoid using it. And Documentation is updated accordingly. It also converts existing .target() to newly defined light weight .target_index() routine for many driver. Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Russell King <linux@arm.linux.org.uk> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
2013-10-25 14:15:48 +00:00
unsigned int index)
{
int rc;
rc = do_set_cpu_speed(policy, index);
ppc_proc_freq = cur_freq * 1000ul;
return rc;
}
static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
return cpufreq_generic_init(policy, pmac_cpu_freqs, transition_latency);
}
static u32 read_gpio(struct device_node *np)
{
const u32 *reg = of_get_property(np, "reg", NULL);
u32 offset;
if (reg == NULL)
return 0;
/* That works for all keylargos but shall be fixed properly
* some day... The problem is that it seems we can't rely
* on the "reg" property of the GPIO nodes, they are either
* relative to the base of KeyLargo or to the base of the
* GPIO space, and the device-tree doesn't help.
*/
offset = *reg;
if (offset < KEYLARGO_GPIO_LEVELS0)
offset += KEYLARGO_GPIO_LEVELS0;
return offset;
}
static int pmac_cpufreq_suspend(struct cpufreq_policy *policy)
{
/* Ok, this could be made a bit smarter, but let's be robust for now. We
* always force a speed change to high speed before sleep, to make sure
* we have appropriate voltage and/or bus speed for the wakeup process,
* and to make sure our loops_per_jiffies are "good enough", that is will
* not cause too short delays if we sleep in low speed and wake in high
* speed..
*/
no_schedule = 1;
sleep_freq = cur_freq;
if (cur_freq == low_freq && !is_pmu_based)
do_set_cpu_speed(policy, CPUFREQ_HIGH);
return 0;
}
static int pmac_cpufreq_resume(struct cpufreq_policy *policy)
{
/* If we resume, first check if we have a get() function */
if (get_speed_proc)
cur_freq = get_speed_proc();
else
cur_freq = 0;
/* We don't, hrm... we don't really know our speed here, best
* is that we force a switch to whatever it was, which is
* probably high speed due to our suspend() routine
*/
do_set_cpu_speed(policy, sleep_freq == low_freq ?
CPUFREQ_LOW : CPUFREQ_HIGH);
ppc_proc_freq = cur_freq * 1000ul;
no_schedule = 0;
return 0;
}
static struct cpufreq_driver pmac_cpufreq_driver = {
.verify = cpufreq_generic_frequency_table_verify,
cpufreq: Implement light weight ->target_index() routine Currently, the prototype of cpufreq_drivers target routines is: int target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation); And most of the drivers call cpufreq_frequency_table_target() to get a valid index of their frequency table which is closest to the target_freq. And they don't use target_freq and relation after that. So, it makes sense to just do this work in cpufreq core before calling cpufreq_frequency_table_target() and simply pass index instead. But this can be done only with drivers which expose their frequency table with cpufreq core. For others we need to stick with the old prototype of target() until those drivers are converted to expose frequency tables. This patch implements the new light weight prototype for target_index() routine. It looks like this: int target_index(struct cpufreq_policy *policy, unsigned int index); CPUFreq core will call cpufreq_frequency_table_target() before calling this routine and pass index to it. Because CPUFreq core now requires to call routines present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time. This also marks target() interface as deprecated. So, that new drivers avoid using it. And Documentation is updated accordingly. It also converts existing .target() to newly defined light weight .target_index() routine for many driver. Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Russell King <linux@arm.linux.org.uk> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
2013-10-25 14:15:48 +00:00
.target_index = pmac_cpufreq_target,
.get = pmac_cpufreq_get_speed,
.init = pmac_cpufreq_cpu_init,
.suspend = pmac_cpufreq_suspend,
.resume = pmac_cpufreq_resume,
.flags = CPUFREQ_PM_NO_WARN,
.attr = cpufreq_generic_attr,
.name = "powermac",
};
static int pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
{
struct device_node *volt_gpio_np = of_find_node_by_name(NULL,
"voltage-gpio");
struct device_node *freq_gpio_np = of_find_node_by_name(NULL,
"frequency-gpio");
struct device_node *slew_done_gpio_np = of_find_node_by_name(NULL,
"slewing-done");
const u32 *value;
/*
* Check to see if it's GPIO driven or PMU only
*
* The way we extract the GPIO address is slightly hackish, but it
* works well enough for now. We need to abstract the whole GPIO
* stuff sooner or later anyway
*/
if (volt_gpio_np)
voltage_gpio = read_gpio(volt_gpio_np);
if (freq_gpio_np)
frequency_gpio = read_gpio(freq_gpio_np);
if (slew_done_gpio_np)
slew_done_gpio = read_gpio(slew_done_gpio_np);
/* If we use the frequency GPIOs, calculate the min/max speeds based
* on the bus frequencies
*/
if (frequency_gpio && slew_done_gpio) {
int lenp, rc;
const u32 *freqs, *ratio;
freqs = of_get_property(cpunode, "bus-frequencies", &lenp);
lenp /= sizeof(u32);
if (freqs == NULL || lenp != 2) {
pr_err("bus-frequencies incorrect or missing\n");
return 1;
}
ratio = of_get_property(cpunode, "processor-to-bus-ratio*2",
NULL);
if (ratio == NULL) {
pr_err("processor-to-bus-ratio*2 missing\n");
return 1;
}
/* Get the min/max bus frequencies */
low_freq = min(freqs[0], freqs[1]);
hi_freq = max(freqs[0], freqs[1]);
/* Grrrr.. It _seems_ that the device-tree is lying on the low bus
* frequency, it claims it to be around 84Mhz on some models while
* it appears to be approx. 101Mhz on all. Let's hack around here...
* fortunately, we don't need to be too precise
*/
if (low_freq < 98000000)
low_freq = 101000000;
/* Convert those to CPU core clocks */
low_freq = (low_freq * (*ratio)) / 2000;
hi_freq = (hi_freq * (*ratio)) / 2000;
/* Now we get the frequencies, we read the GPIO to see what is out current
* speed
*/
rc = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
cur_freq = (rc & 0x01) ? hi_freq : low_freq;
set_speed_proc = gpios_set_cpu_speed;
return 1;
}
/* If we use the PMU, look for the min & max frequencies in the
* device-tree
*/
value = of_get_property(cpunode, "min-clock-frequency", NULL);
if (!value)
return 1;
low_freq = (*value) / 1000;
/* The PowerBook G4 12" (PowerBook6,1) has an error in the device-tree
* here */
if (low_freq < 100000)
low_freq *= 10;
value = of_get_property(cpunode, "max-clock-frequency", NULL);
if (!value)
return 1;
hi_freq = (*value) / 1000;
set_speed_proc = pmu_set_cpu_speed;
is_pmu_based = 1;
return 0;
}
static int pmac_cpufreq_init_7447A(struct device_node *cpunode)
{
struct device_node *volt_gpio_np;
if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
return 1;
volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
if (volt_gpio_np)
voltage_gpio = read_gpio(volt_gpio_np);
if (!voltage_gpio){
pr_err("missing cpu-vcore-select gpio\n");
return 1;
}
/* OF only reports the high frequency */
hi_freq = cur_freq;
low_freq = cur_freq/2;
/* Read actual frequency from CPU */
cur_freq = dfs_get_cpu_speed();
set_speed_proc = dfs_set_cpu_speed;
get_speed_proc = dfs_get_cpu_speed;
return 0;
}
static int pmac_cpufreq_init_750FX(struct device_node *cpunode)
{
struct device_node *volt_gpio_np;
u32 pvr;
const u32 *value;
if (of_get_property(cpunode, "dynamic-power-step", NULL) == NULL)
return 1;
hi_freq = cur_freq;
value = of_get_property(cpunode, "reduced-clock-frequency", NULL);
if (!value)
return 1;
low_freq = (*value) / 1000;
volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
if (volt_gpio_np)
voltage_gpio = read_gpio(volt_gpio_np);
pvr = mfspr(SPRN_PVR);
has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
set_speed_proc = cpu_750fx_cpu_speed;
get_speed_proc = cpu_750fx_get_cpu_speed;
cur_freq = cpu_750fx_get_cpu_speed();
return 0;
}
/* Currently, we support the following machines:
*
* - Titanium PowerBook 1Ghz (PMU based, 667Mhz & 1Ghz)
* - Titanium PowerBook 800 (PMU based, 667Mhz & 800Mhz)
* - Titanium PowerBook 400 (PMU based, 300Mhz & 400Mhz)
* - Titanium PowerBook 500 (PMU based, 300Mhz & 500Mhz)
* - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
* - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
* - Recent MacRISC3 laptops
* - All new machines with 7447A CPUs
*/
static int __init pmac_cpufreq_setup(void)
{
struct device_node *cpunode;
const u32 *value;
if (strstr(boot_command_line, "nocpufreq"))
return 0;
/* Get first CPU node */
cpunode = of_cpu_device_node_get(0);
if (!cpunode)
goto out;
/* Get current cpu clock freq */
value = of_get_property(cpunode, "clock-frequency", NULL);
if (!value)
goto out;
cur_freq = (*value) / 1000;
transition_latency = CPUFREQ_ETERNAL;
/* Check for 7447A based MacRISC3 */
if (of_machine_is_compatible("MacRISC3") &&
of_get_property(cpunode, "dynamic-power-step", NULL) &&
PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
pmac_cpufreq_init_7447A(cpunode);
transition_latency = 8000000;
/* Check for other MacRISC3 machines */
} else if (of_machine_is_compatible("PowerBook3,4") ||
of_machine_is_compatible("PowerBook3,5") ||
of_machine_is_compatible("MacRISC3")) {
pmac_cpufreq_init_MacRISC3(cpunode);
/* Else check for iBook2 500/600 */
} else if (of_machine_is_compatible("PowerBook4,1")) {
hi_freq = cur_freq;
low_freq = 400000;
set_speed_proc = pmu_set_cpu_speed;
is_pmu_based = 1;
}
/* Else check for TiPb 550 */
else if (of_machine_is_compatible("PowerBook3,3") && cur_freq == 550000) {
hi_freq = cur_freq;
low_freq = 500000;
set_speed_proc = pmu_set_cpu_speed;
is_pmu_based = 1;
}
/* Else check for TiPb 400 & 500 */
else if (of_machine_is_compatible("PowerBook3,2")) {
/* We only know about the 400 MHz and the 500Mhz model
* they both have 300 MHz as low frequency
*/
if (cur_freq < 350000 || cur_freq > 550000)
goto out;
hi_freq = cur_freq;
low_freq = 300000;
set_speed_proc = pmu_set_cpu_speed;
is_pmu_based = 1;
}
/* Else check for 750FX */
else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
pmac_cpufreq_init_750FX(cpunode);
out:
of_node_put(cpunode);
if (set_speed_proc == NULL)
return -ENODEV;
pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
ppc_proc_freq = cur_freq * 1000ul;
pr_info("Registering PowerMac CPU frequency driver\n");
pr_info("Low: %d Mhz, High: %d Mhz, Boot: %d Mhz\n",
low_freq/1000, hi_freq/1000, cur_freq/1000);
return cpufreq_register_driver(&pmac_cpufreq_driver);
}
module_init(pmac_cpufreq_setup);