/*
* arch/ppc/platforms/pmac_cpufreq.c
*
- * Copyright (C) 2002 - 2004 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 <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
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;
#define PMAC_CPU_LOW_SPEED 1
{0, CPUFREQ_TABLE_END},
};
+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();
-#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 __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)
{
/* ramping up, set voltage first */
pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, voltage_gpio, 0x05);
/* Make sure we sleep for at least 1ms */
- msleep(1);
+ 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);
- msleep(1);
+ local_delay(1);
}
return 0;
}
-static unsigned int __pmac dfs_get_cpu_speed(unsigned int cpu)
+static unsigned int __pmac dfs_get_cpu_speed(void)
{
if (mfspr(SPRN_HID1) & HID1_DFS)
return low_freq;
*/
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 */
- msleep(10);
+ 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 {
- 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 */
- msleep(10);
+ local_delay(10);
}
#ifdef DEBUG_FREQ
struct adb_request req;
unsigned long save_l2cr;
unsigned long save_l3cr;
+ unsigned int pic_prio;
+ unsigned long flags;
preempt_disable();
printk(KERN_DEBUG "HID1, before: %x\n", mfspr(SPRN_HID1));
#endif
/* Disable all interrupt sources on openpic */
- openpic_set_priority(0xf);
+ 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();
wakeup_decrementer();
/* Restore interrupts */
- openpic_set_priority(0);
+ openpic_set_priority(pic_prio);
/* Let interrupts flow again ... */
- local_irq_enable();
+ local_irq_restore(flags);
#ifdef DEBUG_FREQ
debug_calc_bogomips();
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;
+ unsigned long l3cr;
+ static unsigned long prev_l3cr;
freqs.old = cur_freq;
freqs.new = (speed_mode == PMAC_CPU_HIGH_SPEED) ? hi_freq : low_freq;
if (freqs.old == freqs.new)
return 0;
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ if (notify)
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+ if (speed_mode == PMAC_CPU_LOW_SPEED &&
+ cpu_has_feature(CPU_FTR_L3CR)) {
+ l3cr = _get_L3CR();
+ if (l3cr & L3CR_L3E) {
+ prev_l3cr = l3cr;
+ _set_L3CR(0);
+ }
+ }
set_speed_proc(speed_mode == PMAC_CPU_LOW_SPEED);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+ if (speed_mode == PMAC_CPU_HIGH_SPEED &&
+ 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 == PMAC_CPU_HIGH_SPEED) ? hi_freq : low_freq;
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)
{
return cpufreq_frequency_table_verify(policy, pmac_cpu_freqs);
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)
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)
+ do_set_cpu_speed(PMAC_CPU_HIGH_SPEED, 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 ? PMAC_CPU_LOW_SPEED
+ : PMAC_CPU_HIGH_SPEED, 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,
.name = "powermac",
.owner = THIS_MODULE,
};
static int __pmac pmac_cpufreq_init_7447A(struct device_node *cpunode)
{
struct device_node *volt_gpio_np;
- u32 *reg;
- struct cpufreq_driver *driver = &pmac_cpufreq_driver;
- /* Look for voltage GPIO */
+ if (get_property(cpunode, "dynamic-power-step", NULL) == NULL)
+ return 1;
+
volt_gpio_np = of_find_node_by_name(NULL, "cpu-vcore-select");
- reg = (u32 *)get_property(volt_gpio_np, "reg", NULL);
- voltage_gpio = *reg;
- if (!volt_gpio_np){
+ 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;
}
low_freq = cur_freq/2;
/* Read actual frequency from CPU */
- driver->get = dfs_get_cpu_speed;
- cur_freq = driver->get(0);
+ 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;
}
set_speed_proc = pmu_set_cpu_speed;
}
/* Else check for 750FX */
- else if (PVR_VER(mfspr(SPRN_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;
- set_speed_proc = cpu_750fx_cpu_speed;
- }
+ else if (PVR_VER(mfspr(SPRN_PVR)) == 0x7000)
+ pmac_cpufreq_init_750FX(cpunode);
out:
if (set_speed_proc == NULL)
return -ENODEV;
projects / linux-2.6 / commitdiff