1 files changed, 728 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powermac/pmac_cpufreq.c b/arch/powerpc/platforms/powermac/pmac_cpufreq.c
new file mode 100644
index 000000000000..6d32d99402be
--- /dev/null
+++ b/arch/powerpc/platforms/powermac/pmac_cpufreq.c
@@ -0,0 +1,728 @@
+/*
+ *  arch/ppc/platforms/pmac_cpufreq.c
+ *
+ *  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.
+ *
+ */
+
+#include <linux/config.h>
+#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/slab.h>
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+#include <linux/sysdev.h>
+#include <linux/i2c.h>
+#include <linux/hardirq.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/system.h>
+#include <asm/mpic.h>
+#include <asm/keylargo.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
+
+/*
+ * There is a problem with the core cpufreq code on SMP kernels,
+ * it won't recalculate the Bogomips properly
+ */
+#ifdef CONFIG_SMP
+#warning "WARNING, CPUFREQ not recommended on SMP kernels"
+#endif
+
+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;
+
+/*
+ * Different models uses different mecanisms 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[] = {
+        {CPUFREQ_HIGH,          0},
+        {CPUFREQ_LOW,           0},
+        {0,                     CPUFREQ_TABLE_END},
+};
+
+static struct freq_attr* pmac_cpu_freqs_attr[] = {
+        &cpufreq_freq_attr_scaling_available_freqs,
+        NULL,
+};
+
+static inline void local_delay(unsigned long ms)
+{
+        if (no_schedule)
+                mdelay(ms);
+        else
+                msleep(ms);
+}
+
+static inline void wakeup_decrementer(void)
+{
+        set_dec(tb_ticks_per_jiffy);
+        /* No currently-supported powerbook has a 601,
+         * so use get_tbl, not native
+         */
+        last_jiffy_stamp(0) = tb_last_stamp = get_tbl();
+}
+
+#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.
+         */
+        extern void calibrate_delay(void);
+
+        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 occuring 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 */
+        set_context(current->active_mm->context, current->active_mm->pgd);
+
+#ifdef DEBUG_FREQ
+        printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
+#endif
+
+        /* Restore low level PMU operations */
+        pmu_unlock();
+
+        /* Restore decrementer */
+        wakeup_decrementer();
+
+        /* 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(int speed_mode, int notify)
+{
+        struct cpufreq_freqs freqs;
+        unsigned long l3cr;
+        static unsigned long prev_l3cr;
+
+        freqs.old = cur_freq;
+        freqs.new = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
+        freqs.cpu = smp_processor_id();
+
+        if (freqs.old == freqs.new)
+                return 0;
+
+        if (notify)
+                cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+        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);
+        }
+        if (notify)
+                cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+        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_verify(struct cpufreq_policy *policy)
+{
+        return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs);
+}
+
+static int pmac_cpufreq_target( struct cpufreq_policy *policy,
+                                        unsigned int target_freq,
+                                        unsigned int relation)
+{
+        unsigned int    newstate = 0;
+
+        if (cpufreq_frequency_table_target(policy, pmac_cpu_freqs,
+                        target_freq, relation, &newstate))
+                return -EINVAL;
+
+        return do_set_cpu_speed(newstate, 1);
+}
+
+unsigned int pmac_get_one_cpufreq(int i)
+{
+        /* Supports only one CPU for now */
+        return (i == 0) ? cur_freq : 0;
+}
+
+static int pmac_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+        if (policy->cpu != 0)
+                return -ENODEV;
+
+        policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
+        policy->cpuinfo.transition_latency      = CPUFREQ_ETERNAL;
+        policy->cur = cur_freq;
+
+        cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu);
+        return cpufreq_frequency_table_cpuinfo(policy, pmac_cpu_freqs);
+}
+
+static u32 read_gpio(struct device_node *np)
+{
+        u32 *reg = (u32 *)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, pm_message_t pmsg)
+{
+        /* 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(CPUFREQ_HIGH, 0);
+        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(sleep_freq == low_freq ?
+                         CPUFREQ_LOW : CPUFREQ_HIGH, 0);
+
+        no_schedule = 0;
+        return 0;
+}
+
+static struct cpufreq_driver pmac_cpufreq_driver = {
+        .verify         = pmac_cpufreq_verify,
+        .target         = 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           = pmac_cpu_freqs_attr,
+        .name           = "powermac",
+        .owner          = THIS_MODULE,
+};
+
+
+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");
+        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;
+                u32 *freqs, *ratio;
+
+                freqs = (u32 *)get_property(cpunode, "bus-frequencies", &lenp);
+                lenp /= sizeof(u32);
+                if (freqs == NULL || lenp != 2) {
+                        printk(KERN_ERR "cpufreq: bus-frequencies incorrect or missing\n");
+                        return 1;
+                }
+                ratio = (u32 *)get_property(cpunode, "processor-to-bus-ratio*2", NULL);
+                if (ratio == NULL) {
+                        printk(KERN_ERR "cpufreq: 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 = (u32 *)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 = (u32 *)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 (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){
+                printk(KERN_ERR "cpufreq: 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, *value;
+
+        if (get_property(cpunode, "dynamic-power-step", NULL) == NULL)
+                return 1;
+
+        hi_freq = cur_freq;
+        value = (u32 *)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;
+        u32                     *value;
+
+        if (strstr(cmd_line, "nocpufreq"))
+                return 0;
+
+        /* Assume only one CPU */
+        cpunode = find_type_devices("cpu");
+        if (!cpunode)
+                goto out;
+
+        /* Get current cpu clock freq */
+        value = (u32 *)get_property(cpunode, "clock-frequency", NULL);
+        if (!value)
+                goto out;
+        cur_freq = (*value) / 1000;
+
+        /*  Check for 7447A based MacRISC3 */
+        if (machine_is_compatible("MacRISC3") &&
+            get_property(cpunode, "dynamic-power-step", NULL) &&
+            PVR_VER(mfspr(SPRN_PVR)) == 0x8003) {
+                pmac_cpufreq_init_7447A(cpunode);
+        /* Check for other MacRISC3 machines */
+        } else if (machine_is_compatible("PowerBook3,4") ||
+                   machine_is_compatible("PowerBook3,5") ||
+                   machine_is_compatible("MacRISC3")) {
+                pmac_cpufreq_init_MacRISC3(cpunode);
+        /* Else check for iBook2 500/600 */
+        } else if (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 400 & 500 */
+        else if (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:
+        if (set_speed_proc == NULL)
+                return -ENODEV;
+
+        pmac_cpu_freqs[CPUFREQ_LOW].frequency = low_freq;
+        pmac_cpu_freqs[CPUFREQ_HIGH].frequency = hi_freq;
+
+        printk(KERN_INFO "Registering PowerMac CPU frequency driver\n");
+        printk(KERN_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);
+