/*
* arch/ppc/platforms/pmac_cpufreq.c
*
- * Copyright (C) 2002 - 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ * 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/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/hardirq.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/open_pic.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
#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);
-extern void openpic_suspend(struct sys_device *sysdev, u32 state);
-extern void openpic_resume(struct sys_device *sysdev);
-extern void enable_kernel_altivec(void);
-extern void enable_kernel_fp(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;
-/* Clean that up some day ... use a func ptr or at least an enum... */
-static int cpufreq_uses_pmu;
-static int cpufreq_uses_gpios;
+/*
+ * 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;
-
-#define PMAC_CPU_LOW_SPEED 1
-#define PMAC_CPU_HIGH_SPEED 0
+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 PMAC_CPU_HIGH_SPEED
-#define CPUFREQ_LOW PMAC_CPU_LOW_SPEED
+#define CPUFREQ_HIGH 0
+#define CPUFREQ_LOW 1
static struct cpufreq_frequency_table pmac_cpu_freqs[] = {
{CPUFREQ_HIGH, 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);
*/
static int __pmac cpu_750fx_cpu_speed(int low_speed)
{
-#ifdef DEBUG_FREQ
- printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
-#endif
+ 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
-#ifdef DEBUG_FREQ
- printk(KERN_DEBUG "HID1, after: %x\n", mfspr(SPRN_HID1));
- debug_calc_bogomips();
+ 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 __pmac 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 __pmac 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 __pmac 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 __pmac gpios_set_cpu_speed(unsigned int low_speed)
+static int __pmac gpios_set_cpu_speed(int low_speed)
{
- int gpio;
+ 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 */
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(HZ/100);
+ local_delay(10);
}
/* Set frequency */
- pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, frequency_gpio, low_speed ? 0x04 : 0x05);
+ 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 {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(1);
+ 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 */
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(HZ/100);
+ local_delay(10);
}
#ifdef DEBUG_FREQ
/* Switch CPU speed under PMU control
*/
-static int __pmac pmu_set_cpu_speed(unsigned int low_speed)
+static int __pmac 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 */
- openpic_suspend(NULL, 1);
+ pic_prio = openpic_get_priority();
+ openpic_set_priority(0xf);
/* Make sure the decrementer won't interrupt us */
asm volatile("mtdec %0" : : "r" (0x7fffffff));
asm volatile("mtdec %0" : : "r" (0x7fffffff));
/* We can now disable MSR_EE */
- local_irq_disable();
+ local_irq_save(flags);
/* Giveup the FPU & vec */
enable_kernel_fp();
#ifdef CONFIG_ALTIVEC
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_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) */
- if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
- _set_L3CR(save_l3cr & 0x7fffffff);
- if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
- _set_L2CR(save_l2cr & 0x7fffffff);
/* 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
wakeup_decrementer();
/* Restore interrupts */
- openpic_resume(NULL);
+ openpic_set_priority(pic_prio);
/* Let interrupts flow again ... */
- local_irq_enable();
+ local_irq_restore(flags);
#ifdef DEBUG_FREQ
debug_calc_bogomips();
#endif
+ pmu_resume();
+
preempt_enable();
return 0;
}
-static int __pmac do_set_cpu_speed(int speed_mode)
+static int __pmac do_set_cpu_speed(int speed_mode, int notify)
{
struct cpufreq_freqs freqs;
- int rc;
+ unsigned long l3cr;
+ static unsigned long prev_l3cr;
freqs.old = cur_freq;
- freqs.new = (speed_mode == PMAC_CPU_HIGH_SPEED) ? hi_freq : low_freq;
+ freqs.new = (speed_mode == CPUFREQ_HIGH) ? hi_freq : low_freq;
freqs.cpu = smp_processor_id();
if (freqs.old == freqs.new)
return 0;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
- if (cpufreq_uses_pmu)
- rc = pmu_set_cpu_speed(speed_mode);
- else if (cpufreq_uses_gpios)
- rc = gpios_set_cpu_speed(speed_mode);
- else
- rc = cpu_750fx_cpu_speed(speed_mode);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- cur_freq = (speed_mode == PMAC_CPU_HIGH_SPEED) ? hi_freq : low_freq;
+ 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 rc;
+ return 0;
+}
+
+static unsigned int __pmac pmac_cpufreq_get_speed(unsigned int cpu)
+{
+ return cur_freq;
}
static int __pmac pmac_cpufreq_verify(struct cpufreq_policy *policy)
target_freq, relation, &newstate))
return -EINVAL;
- return do_set_cpu_speed(newstate);
+ return do_set_cpu_speed(newstate, 1);
}
unsigned int __pmac pmac_get_one_cpufreq(int i)
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
policy->cur = cur_freq;
- return cpufreq_frequency_table_cpuinfo(policy, &pmac_cpu_freqs[0]);
+ cpufreq_frequency_table_get_attr(pmac_cpu_freqs, policy->cpu);
+ return cpufreq_frequency_table_cpuinfo(policy, pmac_cpu_freqs);
}
static u32 __pmac 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...
+ * 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 pmac_cpufreq_suspend(struct cpufreq_policy *policy, u32 state)
+{
+ /* 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..
*/
- return 0x50 + (*reg);
+ 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 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 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 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 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 (PMU based, 400Mhz & 500Mhz)
+ * - iBook2 500/600 (PMU based, 400Mhz & 500/600Mhz)
* - iBook2 700 (CPU based, 400Mhz & 700Mhz, support low voltage)
- * - Recent MacRISC3 machines
+ * - Recent MacRISC3 laptops
+ * - All new machines with 7447A CPUs
*/
static int __init pmac_cpufreq_setup(void)
{
struct device_node *cpunode;
u32 *value;
- int has_freq_ctl = 0;
if (strstr(cmd_line, "nocpufreq"))
return 0;
goto out;
cur_freq = (*value) / 1000;
- /* Check for newer machines */
- if (machine_is_compatible("PowerBook3,4") ||
- machine_is_compatible("PowerBook3,5") ||
- machine_is_compatible("MacRISC3")) {
- 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");
-
- /*
- * 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");
- goto out;
- }
- 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");
- goto out;
- }
-
- /* 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;
-
- has_freq_ctl = 1;
- cpufreq_uses_gpios = 1;
- goto out;
- }
-
- /* 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)
- goto out;
- 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)
- goto out;
- hi_freq = (*value) / 1000;
- has_freq_ctl = 1;
- cpufreq_uses_pmu = 1;
- }
- /* Else check for iBook2 500 */
- else if (machine_is_compatible("PowerBook4,1")) {
- /* We only know about 500Mhz model */
- if (cur_freq < 450000 || cur_freq > 550000)
- goto out;
+ /* 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;
- has_freq_ctl = 1;
- cpufreq_uses_pmu = 1;
+ set_speed_proc = pmu_set_cpu_speed;
+ is_pmu_based = 1;
}
- /* Else check for TiPb 500 */
+ /* Else check for TiPb 400 & 500 */
else if (machine_is_compatible("PowerBook3,2")) {
- /* We only know about 500Mhz model */
- if (cur_freq < 450000 || cur_freq > 550000)
+ /* 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;
- has_freq_ctl = 1;
- cpufreq_uses_pmu = 1;
+ set_speed_proc = pmu_set_cpu_speed;
+ is_pmu_based = 1;
}
/* Else check for 750FX */
- else if (PVR_VER(mfspr(PVR)) == 0x7000) {
- if (get_property(cpunode, "dynamic-power-step", NULL) == NULL)
- goto out;
- hi_freq = cur_freq;
- value = (u32 *)get_property(cpunode, "reduced-clock-frequency", NULL);
- if (!value)
- goto out;
- low_freq = (*value) / 1000;
- cpufreq_uses_pmu = 0;
- has_freq_ctl = 1;
- }
+ else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
+ pmac_cpufreq_init_750FX(cpunode);
out:
- if (!has_freq_ctl)
+ 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, switch method: %s\n",
- low_freq/1000, hi_freq/1000, cur_freq/1000,
- cpufreq_uses_pmu ? "PMU" : (cpufreq_uses_gpios ? "GPIOs" : "CPU"));
+ 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);
}
git://git.onelab.eu / linux-2.6.git / blobdiff