aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/cell/cbe_cpufreq.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/platforms/cell/cbe_cpufreq.c')
-rw-r--r--arch/powerpc/platforms/cell/cbe_cpufreq.c196
1 files changed, 9 insertions, 187 deletions
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.c b/arch/powerpc/platforms/cell/cbe_cpufreq.c
index a62562ee1461..9a9932624c0c 100644
--- a/arch/powerpc/platforms/cell/cbe_cpufreq.c
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq.c
@@ -1,7 +1,7 @@
/*
* cpufreq driver for the cell processor
*
- * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
*
* Author: Christian Krafft <krafft@de.ibm.com>
*
@@ -21,18 +21,10 @@
*/
#include <linux/cpufreq.h>
-#include <linux/timer.h>
-
-#include <asm/hw_irq.h>
-#include <asm/io.h>
#include <asm/machdep.h>
-#include <asm/processor.h>
-#include <asm/prom.h>
-#include <asm/time.h>
-#include <asm/pmi.h>
#include <asm/of_platform.h>
-
-#include "cbe_regs.h"
+#include <asm/prom.h>
+#include "cbe_cpufreq.h"
static DEFINE_MUTEX(cbe_switch_mutex);
@@ -50,183 +42,24 @@ static struct cpufreq_frequency_table cbe_freqs[] = {
{0, CPUFREQ_TABLE_END},
};
-/* to write to MIC register */
-static u64 MIC_Slow_Fast_Timer_table[] = {
- [0 ... 7] = 0x007fc00000000000ull,
-};
-
-/* more values for the MIC */
-static u64 MIC_Slow_Next_Timer_table[] = {
- 0x0000240000000000ull,
- 0x0000268000000000ull,
- 0x000029C000000000ull,
- 0x00002D0000000000ull,
- 0x0000300000000000ull,
- 0x0000334000000000ull,
- 0x000039C000000000ull,
- 0x00003FC000000000ull,
-};
-
-static u8 pmi_slow_mode_limit[MAX_BE];
-
/*
* hardware specific functions
*/
-static bool cbe_cpufreq_has_pmi;
-
-#ifdef CONFIG_PPC_PMI
-static int set_pmode_pmi(int cpu, unsigned int pmode)
-{
- int ret;
- pmi_message_t pmi_msg;
-#ifdef DEBUG
- long time;
-#endif
-
- pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
- pmi_msg.data1 = cbe_cpu_to_node(cpu);
- pmi_msg.data2 = pmode;
-
-#ifdef DEBUG
- time = jiffies;
-#endif
-
- pmi_send_message(pmi_msg);
- ret = pmi_msg.data2;
-
- pr_debug("PMI returned slow mode %d\n", ret);
-
-#ifdef DEBUG
- time = jiffies - time; /* actual cycles (not cpu cycles!) */
- time = jiffies_to_msecs(time);
- pr_debug("had to wait %lu ms for a transition using PMI.\n", time);
-#endif
- return ret;
-}
-#endif
-
-static int get_pmode(int cpu)
-{
- int ret;
- struct cbe_pmd_regs __iomem *pmd_regs;
-
- pmd_regs = cbe_get_cpu_pmd_regs(cpu);
- ret = in_be64(&pmd_regs->pmsr) & 0x07;
-
- return ret;
-}
-
-static int set_pmode_reg(int cpu, unsigned int pmode)
-{
- struct cbe_pmd_regs __iomem *pmd_regs;
- struct cbe_mic_tm_regs __iomem *mic_tm_regs;
- u64 flags;
- u64 value;
-#ifdef DEBUG
- long time;
-#endif
-
- local_irq_save(flags);
-
- mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
- pmd_regs = cbe_get_cpu_pmd_regs(cpu);
-
-#ifdef DEBUG
- time = jiffies;
-#endif
- out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
- out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
-
- out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
- out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
-
- value = in_be64(&pmd_regs->pmcr);
- /* set bits to zero */
- value &= 0xFFFFFFFFFFFFFFF8ull;
- /* set bits to next pmode */
- value |= pmode;
-
- out_be64(&pmd_regs->pmcr, value);
-
-#ifdef DEBUG
- /* wait until new pmode appears in status register */
- value = in_be64(&pmd_regs->pmsr) & 0x07;
- while(value != pmode) {
- cpu_relax();
- value = in_be64(&pmd_regs->pmsr) & 0x07;
- }
-
- time = jiffies - time;
- time = jiffies_to_msecs(time);
- pr_debug("had to wait %lu ms for a transition using " \
- "the pervasive unit.\n", time);
-#endif
- local_irq_restore(flags);
-
- return 0;
-}
-
-static int set_pmode(int cpu, unsigned int slow_mode)
+static int set_pmode(unsigned int cpu, unsigned int slow_mode)
{
int rc;
-#ifdef CONFIG_PPC_PMI
+
if (cbe_cpufreq_has_pmi)
- rc = set_pmode_pmi(cpu, slow_mode);
+ rc = cbe_cpufreq_set_pmode_pmi(cpu, slow_mode);
else
-#endif
- rc = set_pmode_reg(cpu, slow_mode);
+ rc = cbe_cpufreq_set_pmode(cpu, slow_mode);
- pr_debug("register contains slow mode %d\n", get_pmode(cpu));
+ pr_debug("register contains slow mode %d\n", cbe_cpufreq_get_pmode(cpu));
return rc;
}
-static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
-{
- u8 node; slow_mode;
-
- BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
-
- node = pmi_msg.data1;
- slow_mode = pmi_msg.data2;
-
- pmi_slow_mode_limit[node] = slow_mode;
-
- pr_debug("cbe_handle_pmi: node: %d, max slow_mode=%d\n", slow_mode);
-}
-
-static int pmi_notifier(struct notifier_block *nb,
- unsigned long event, void *data)
-{
- struct cpufreq_policy *policy = data;
- u8 node;
-
- node = cbe_cpu_to_node(policy->cpu);
-
- pr_debug("got notified, event=%lu, node=%u\n", event, node);
-
- if (pmi_slow_mode_limit[node] != 0) {
- pr_debug("limiting node %d to slow mode %d\n",
- node, pmi_slow_mode_limit[node]);
-
- cpufreq_verify_within_limits(policy, 0,
- cbe_freqs[pmi_slow_mode_limit[node]].frequency);
- }
-
- return 0;
-}
-
-static struct notifier_block pmi_notifier_block = {
- .notifier_call = pmi_notifier,
-};
-
-static struct pmi_handler cbe_pmi_handler = {
- .type = PMI_TYPE_FREQ_CHANGE,
- .handle_pmi_message = cbe_cpufreq_handle_pmi,
-};
-
-
/*
* cpufreq functions
*/
@@ -270,7 +103,7 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
* of a transition */
policy->cpuinfo.transition_latency = 25000;
- cur_pmode = get_pmode(policy->cpu);
+ cur_pmode = cbe_cpufreq_get_pmode(policy->cpu);
pr_debug("current pmode is at %d\n",cur_pmode);
policy->cur = cbe_freqs[cur_pmode].frequency;
@@ -297,7 +130,6 @@ static int cbe_cpufreq_verify(struct cpufreq_policy *policy)
return cpufreq_frequency_table_verify(policy, cbe_freqs);
}
-
static int cbe_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
@@ -352,22 +184,12 @@ static int __init cbe_cpufreq_init(void)
if (!machine_is(cell))
return -ENODEV;
- cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
-
- if (cbe_cpufreq_has_pmi)
- cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
-
return cpufreq_register_driver(&cbe_cpufreq_driver);
}
static void __exit cbe_cpufreq_exit(void)
{
cpufreq_unregister_driver(&cbe_cpufreq_driver);
-
- if (cbe_cpufreq_has_pmi) {
- cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
- pmi_unregister_handler(&cbe_pmi_handler);
- }
}
module_init(cbe_cpufreq_init);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.