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@ -1,13 +1,18 @@
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/*
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* arch/ppc/platforms/pmac_cpufreq.c
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*
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* Copyright (C) 2002 - 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* Copyright (C) 2004 John Steele Scott <toojays@toojays.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* TODO: Need a big cleanup here. Basically, we need to have different
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* cpufreq_driver structures for the different type of HW instead of the
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* current mess. We also need to better deal with the detection of the
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* type of machine.
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*
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*/
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#include <linux/config.h>
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@ -35,6 +40,7 @@
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#include <asm/time.h>
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#include <asm/system.h>
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#include <asm/open_pic.h>
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#include <asm/keylargo.h>
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/* WARNING !!! This will cause calibrate_delay() to be called,
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* but this is an __init function ! So you MUST go edit
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@ -61,11 +67,13 @@ extern void low_sleep_handler(void);
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static unsigned int low_freq;
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static unsigned int hi_freq;
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static unsigned int cur_freq;
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static unsigned int sleep_freq;
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/*
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* Different models uses different mecanisms to switch the frequency
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*/
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static int (*set_speed_proc)(int low_speed);
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static unsigned int (*get_speed_proc)(void);
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/*
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* Some definitions used by the various speedprocs
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@ -73,6 +81,8 @@ static int (*set_speed_proc)(int low_speed);
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static u32 voltage_gpio;
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static u32 frequency_gpio;
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static u32 slew_done_gpio;
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static int no_schedule;
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static int has_cpu_l2lve;
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#define PMAC_CPU_LOW_SPEED 1
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@ -90,6 +100,14 @@ static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
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{0, CPUFREQ_TABLE_END},
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};
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static inline void local_delay(unsigned long ms)
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{
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if (no_schedule)
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mdelay(ms);
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else
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msleep(ms);
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}
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static inline void wakeup_decrementer(void)
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{
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set_dec(tb_ticks_per_jiffy);
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@ -118,20 +136,48 @@ static inline void debug_calc_bogomips(void)
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*/
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static int __pmac cpu_750fx_cpu_speed(int low_speed)
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{
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#ifdef DEBUG_FREQ
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printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
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#endif
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u32 hid2;
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if (low_speed == 0) {
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/* ramping up, set voltage first */
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
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/* Make sure we sleep for at least 1ms */
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local_delay(10);
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/* tweak L2 for high voltage */
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if (has_cpu_l2lve) {
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hid2 = mfspr(SPRN_HID2);
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hid2 &= ~0x2000;
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mtspr(SPRN_HID2, hid2);
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}
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}
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#ifdef CONFIG_6xx
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low_choose_750fx_pll(low_speed);
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#endif
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#ifdef DEBUG_FREQ
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printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
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debug_calc_bogomips();
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#endif
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if (low_speed == 1) {
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/* tweak L2 for low voltage */
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if (has_cpu_l2lve) {
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hid2 = mfspr(SPRN_HID2);
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hid2 |= 0x2000;
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mtspr(SPRN_HID2, hid2);
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}
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/* ramping down, set voltage last */
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
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local_delay(10);
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}
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return 0;
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}
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static unsigned int __pmac cpu_750fx_get_cpu_speed(void)
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{
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if (mfspr(SPRN_HID1) & HID1_PS)
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return low_freq;
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else
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return hi_freq;
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}
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/* Switch CPU speed using DFS */
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static int __pmac dfs_set_cpu_speed(int low_speed)
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{
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@ -139,22 +185,25 @@ static int __pmac dfs_set_cpu_speed(int low_speed)
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/* ramping up, set voltage first */
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
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/* Make sure we sleep for at least 1ms */
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msleep(1);
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local_delay(1);
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}
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/* set frequency */
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#ifdef CONFIG_6xx
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low_choose_7447a_dfs(low_speed);
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#endif
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udelay(100);
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if (low_speed == 1) {
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/* ramping down, set voltage last */
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
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msleep(1);
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local_delay(1);
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}
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return 0;
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}
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static unsigned int __pmac dfs_get_cpu_speed(unsigned int cpu)
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static unsigned int __pmac dfs_get_cpu_speed(void)
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{
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if (mfspr(SPRN_HID1) & HID1_DFS)
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return low_freq;
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@ -167,30 +216,35 @@ static unsigned int __pmac dfs_get_cpu_speed(unsigned int cpu)
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*/
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static int __pmac gpios_set_cpu_speed(int low_speed)
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{
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int gpio;
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int gpio, timeout = 0;
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/* If ramping up, set voltage first */
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if (low_speed == 0) {
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
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/* Delay is way too big but it's ok, we schedule */
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msleep(10);
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local_delay(10);
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}
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/* Set frequency */
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gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, frequency_gpio, 0);
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if (low_speed == ((gpio & 0x01) == 0))
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goto skip;
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio,
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low_speed ? 0x04 : 0x05);
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udelay(200);
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do {
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule_timeout(1);
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if (++timeout > 100)
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break;
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local_delay(1);
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gpio = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, slew_done_gpio, 0);
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} while((gpio & 0x02) == 0);
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skip:
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/* If ramping down, set voltage last */
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if (low_speed == 1) {
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x04);
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/* Delay is way too big but it's ok, we schedule */
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msleep(10);
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local_delay(10);
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}
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#ifdef DEBUG_FREQ
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@ -207,6 +261,8 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
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struct adb_request req;
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unsigned long save_l2cr;
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unsigned long save_l3cr;
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unsigned int pic_prio;
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unsigned long flags;
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preempt_disable();
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@ -214,7 +270,8 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
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printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
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#endif
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/* Disable all interrupt sources on openpic */
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openpic_set_priority(0xf);
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pic_prio = openpic_get_priority();
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openpic_set_priority(0xf);
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/* Make sure the decrementer won't interrupt us */
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asm volatile("mtdec %0" : : "r" (0x7fffffff));
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@ -224,7 +281,7 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
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asm volatile("mtdec %0" : : "r" (0x7fffffff));
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/* We can now disable MSR_EE */
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local_irq_disable();
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local_irq_save(flags);
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/* Giveup the FPU & vec */
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enable_kernel_fp();
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@ -277,10 +334,10 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
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wakeup_decrementer();
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/* Restore interrupts */
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openpic_set_priority(0);
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openpic_set_priority(pic_prio);
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/* Let interrupts flow again ... */
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local_irq_enable();
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local_irq_restore(flags);
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#ifdef DEBUG_FREQ
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debug_calc_bogomips();
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@ -291,9 +348,11 @@ static int __pmac pmu_set_cpu_speed(int low_speed)
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return 0;
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}
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static int __pmac do_set_cpu_speed(int speed_mode)
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static int __pmac do_set_cpu_speed(int speed_mode, int notify)
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{
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struct cpufreq_freqs freqs;
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unsigned long l3cr;
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static unsigned long prev_l3cr;
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freqs.old = cur_freq;
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freqs.new = (speed_mode == PMAC_CPU_HIGH_SPEED) ? hi_freq : low_freq;
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@ -302,14 +361,35 @@ static int __pmac do_set_cpu_speed(int speed_mode)
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if (freqs.old == freqs.new)
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return 0;
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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if (notify)
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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if (speed_mode == PMAC_CPU_LOW_SPEED &&
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cpu_has_feature(CPU_FTR_L3CR)) {
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l3cr = _get_L3CR();
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if (l3cr & L3CR_L3E) {
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prev_l3cr = l3cr;
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_set_L3CR(0);
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}
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}
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set_speed_proc(speed_mode == PMAC_CPU_LOW_SPEED);
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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if (speed_mode == PMAC_CPU_HIGH_SPEED &&
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cpu_has_feature(CPU_FTR_L3CR)) {
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l3cr = _get_L3CR();
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if ((prev_l3cr & L3CR_L3E) && l3cr != prev_l3cr)
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_set_L3CR(prev_l3cr);
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}
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if (notify)
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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cur_freq = (speed_mode == PMAC_CPU_HIGH_SPEED) ? hi_freq : low_freq;
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return 0;
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}
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static unsigned int __pmac pmac_cpufreq_get_speed(unsigned int cpu)
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{
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return cur_freq;
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}
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static int __pmac pmac_cpufreq_verify(struct cpufreq_policy *policy)
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{
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return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs);
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@ -325,7 +405,7 @@ static int __pmac pmac_cpufreq_target( struct cpufreq_policy *policy,
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target_freq, relation, &newstate))
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return -EINVAL;
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return do_set_cpu_speed(newstate);
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return do_set_cpu_speed(newstate, 1);
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}
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unsigned int __pmac pmac_get_one_cpufreq(int i)
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@ -349,19 +429,65 @@ static int __pmac pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
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static u32 __pmac read_gpio(struct device_node *np)
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{
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u32 *reg = (u32 *)get_property(np, "reg", NULL);
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u32 offset;
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if (reg == NULL)
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return 0;
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/* That works for all keylargos but shall be fixed properly
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* some day...
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* some day... The problem is that it seems we can't rely
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* on the "reg" property of the GPIO nodes, they are either
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* relative to the base of KeyLargo or to the base of the
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* GPIO space, and the device-tree doesn't help.
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*/
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return 0x50 + (*reg);
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offset = *reg;
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if (offset < KEYLARGO_GPIO_LEVELS0)
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offset += KEYLARGO_GPIO_LEVELS0;
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return offset;
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}
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static int __pmac pmac_cpufreq_suspend(struct cpufreq_policy *policy, u32 state)
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{
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/* Ok, this could be made a bit smarter, but let's be robust for now. We
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* always force a speed change to high speed before sleep, to make sure
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* we have appropriate voltage and/or bus speed for the wakeup process,
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* and to make sure our loops_per_jiffies are "good enough", that is will
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* not cause too short delays if we sleep in low speed and wake in high
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* speed..
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*/
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no_schedule = 1;
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sleep_freq = cur_freq;
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if (cur_freq == low_freq)
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do_set_cpu_speed(PMAC_CPU_HIGH_SPEED, 0);
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return 0;
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}
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static int __pmac pmac_cpufreq_resume(struct cpufreq_policy *policy)
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{
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/* If we resume, first check if we have a get() function */
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if (get_speed_proc)
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cur_freq = get_speed_proc();
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else
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cur_freq = 0;
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/* We don't, hrm... we don't really know our speed here, best
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* is that we force a switch to whatever it was, which is
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* probably high speed due to our suspend() routine
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*/
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do_set_cpu_speed(sleep_freq == low_freq ? PMAC_CPU_LOW_SPEED
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: PMAC_CPU_HIGH_SPEED, 0);
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no_schedule = 0;
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return 0;
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}
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static struct cpufreq_driver pmac_cpufreq_driver = {
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.verify = pmac_cpufreq_verify,
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.target = pmac_cpufreq_target,
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.get = pmac_cpufreq_get_speed,
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.init = pmac_cpufreq_cpu_init,
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.suspend = pmac_cpufreq_suspend,
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.resume = pmac_cpufreq_resume,
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.flags = CPUFREQ_PM_NO_WARN,
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.name = "powermac",
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.owner = THIS_MODULE,
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};
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@ -461,14 +587,14 @@ static int __pmac pmac_cpufreq_init_MacRISC3(struct device_node *cpunode)
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static int __pmac pmac_cpufreq_init_7447A(struct device_node *cpunode)
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{
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struct device_node *volt_gpio_np;
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u32 *reg;
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struct cpufreq_driver *driver = &pmac_cpufreq_driver;
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/* Look for voltage GPIO */
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if (get_property(cpunode, "dynamic-power-step", NULL) == NULL)
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return 1;
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volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
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reg = (u32 *)get_property(volt_gpio_np, "reg", NULL);
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voltage_gpio = *reg;
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if (!volt_gpio_np){
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if (volt_gpio_np)
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voltage_gpio = read_gpio(volt_gpio_np);
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if (!voltage_gpio){
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printk(KERN_ERR "cpufreq: missing cpu-vcore-select gpio\n");
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return 1;
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}
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@ -478,9 +604,37 @@ static int __pmac pmac_cpufreq_init_7447A(struct device_node *cpunode)
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low_freq = cur_freq/2;
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/* Read actual frequency from CPU */
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driver->get = dfs_get_cpu_speed;
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cur_freq = driver->get(0);
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cur_freq = dfs_get_cpu_speed();
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set_speed_proc = dfs_set_cpu_speed;
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get_speed_proc = dfs_get_cpu_speed;
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return 0;
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}
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static int __pmac pmac_cpufreq_init_750FX(struct device_node *cpunode)
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{
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struct device_node *volt_gpio_np;
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u32 pvr, *value;
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if (get_property(cpunode, "dynamic-power-step", NULL) == NULL)
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return 1;
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hi_freq = cur_freq;
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value = (u32 *)get_property(cpunode, "reduced-clock-frequency", NULL);
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if (!value)
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return 1;
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low_freq = (*value) / 1000;
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volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
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if (volt_gpio_np)
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voltage_gpio = read_gpio(volt_gpio_np);
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pvr = mfspr(SPRN_PVR);
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has_cpu_l2lve = !((pvr & 0xf00) == 0x100);
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set_speed_proc = cpu_750fx_cpu_speed;
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get_speed_proc = cpu_750fx_get_cpu_speed;
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cur_freq = cpu_750fx_get_cpu_speed();
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return 0;
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}
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@ -543,16 +697,8 @@ static int __init pmac_cpufreq_setup(void)
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set_speed_proc = pmu_set_cpu_speed;
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}
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/* Else check for 750FX */
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else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000) {
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if (get_property(cpunode, "dynamic-power-step", NULL) == NULL)
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goto out;
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hi_freq = cur_freq;
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value = (u32 *)get_property(cpunode, "reduced-clock-frequency", NULL);
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if (!value)
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goto out;
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low_freq = (*value) / 1000;
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set_speed_proc = cpu_750fx_cpu_speed;
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}
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else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
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pmac_cpufreq_init_750FX(cpunode);
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out:
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if (set_speed_proc == NULL)
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return -ENODEV;
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