[CELL] cbe_cpufreq: reorganize code
This patch reorganizes the code of the driver into three files. Two cbe_cpufreq_pmi.c and cbe_cpufreq_pervasive.c care about hardware. cbe_cpufreq.c contains the logic. There is no changed behaviour, except that the PMI related function is now located in a seperate module cbe_cpufreq_pmi. This module will be required by cbe_cpufreq, if CONFIG_CBE_CPUFREQ_PMI has been set. Signed-off-by: Christian Krafft <krafft@de.ibm.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
This commit is contained in:
Christian Krafft
Arnd Bergmann
parent
1e21fd5af3
commit
74889e41d9
6 changed files with 311 additions and 190 deletions
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@ -73,4 +73,14 @@ config CBE_CPUFREQ
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For details, take a look at <file:Documentation/cpu-freq/>.
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If you don't have such processor, say N
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config CBE_CPUFREQ_PMI
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tristate "CBE frequency scaling using PMI interface"
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depends on CBE_CPUFREQ && PPC_PMI && EXPERIMENTAL
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default n
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help
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Select this, if you want to use the PMI interface
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to switch frequencies. Using PMI, the
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processor will not only be able to run at lower speed,
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but also at lower core voltage.
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endmenu
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@ -4,7 +4,9 @@ obj-$(CONFIG_PPC_CELL_NATIVE) += interrupt.o iommu.o setup.o \
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obj-$(CONFIG_CBE_RAS) += ras.o
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obj-$(CONFIG_CBE_THERM) += cbe_thermal.o
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obj-$(CONFIG_CBE_CPUFREQ) += cbe_cpufreq.o
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obj-$(CONFIG_CBE_CPUFREQ_PMI) += cbe_cpufreq_pmi.o
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obj-$(CONFIG_CBE_CPUFREQ) += cbe-cpufreq.o
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cbe-cpufreq-y += cbe_cpufreq_pervasive.o cbe_cpufreq.o
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ifeq ($(CONFIG_SMP),y)
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obj-$(CONFIG_PPC_CELL_NATIVE) += smp.o
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@ -1,7 +1,7 @@
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/*
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* cpufreq driver for the cell processor
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*
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@ -21,18 +21,10 @@
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*/
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#include <linux/cpufreq.h>
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#include <linux/timer.h>
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#include <asm/hw_irq.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/processor.h>
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#include <asm/prom.h>
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#include <asm/time.h>
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#include <asm/pmi.h>
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#include <asm/of_platform.h>
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#include "cbe_regs.h"
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#include <asm/prom.h>
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#include "cbe_cpufreq.h"
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static DEFINE_MUTEX(cbe_switch_mutex);
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@ -50,183 +42,24 @@ static struct cpufreq_frequency_table cbe_freqs[] = {
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{0, CPUFREQ_TABLE_END},
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};
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/* to write to MIC register */
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static u64 MIC_Slow_Fast_Timer_table[] = {
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[0 ... 7] = 0x007fc00000000000ull,
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};
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/* more values for the MIC */
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static u64 MIC_Slow_Next_Timer_table[] = {
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0x0000240000000000ull,
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0x0000268000000000ull,
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0x000029C000000000ull,
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0x00002D0000000000ull,
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0x0000300000000000ull,
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0x0000334000000000ull,
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0x000039C000000000ull,
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0x00003FC000000000ull,
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};
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static u8 pmi_slow_mode_limit[MAX_BE];
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/*
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* hardware specific functions
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*/
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static bool cbe_cpufreq_has_pmi;
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#ifdef CONFIG_PPC_PMI
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static int set_pmode_pmi(int cpu, unsigned int pmode)
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{
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int ret;
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pmi_message_t pmi_msg;
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#ifdef DEBUG
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long time;
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#endif
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pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
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pmi_msg.data1 = cbe_cpu_to_node(cpu);
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pmi_msg.data2 = pmode;
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#ifdef DEBUG
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time = jiffies;
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#endif
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pmi_send_message(pmi_msg);
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ret = pmi_msg.data2;
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pr_debug("PMI returned slow mode %d\n", ret);
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#ifdef DEBUG
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time = jiffies - time; /* actual cycles (not cpu cycles!) */
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time = jiffies_to_msecs(time);
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pr_debug("had to wait %lu ms for a transition using PMI.\n", time);
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#endif
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return ret;
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}
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#endif
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static int get_pmode(int cpu)
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{
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int ret;
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struct cbe_pmd_regs __iomem *pmd_regs;
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pmd_regs = cbe_get_cpu_pmd_regs(cpu);
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ret = in_be64(&pmd_regs->pmsr) & 0x07;
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return ret;
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}
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static int set_pmode_reg(int cpu, unsigned int pmode)
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{
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struct cbe_pmd_regs __iomem *pmd_regs;
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struct cbe_mic_tm_regs __iomem *mic_tm_regs;
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u64 flags;
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u64 value;
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#ifdef DEBUG
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long time;
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#endif
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local_irq_save(flags);
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mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
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pmd_regs = cbe_get_cpu_pmd_regs(cpu);
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#ifdef DEBUG
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time = jiffies;
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#endif
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out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
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out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
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out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
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out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
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value = in_be64(&pmd_regs->pmcr);
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/* set bits to zero */
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value &= 0xFFFFFFFFFFFFFFF8ull;
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/* set bits to next pmode */
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value |= pmode;
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out_be64(&pmd_regs->pmcr, value);
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#ifdef DEBUG
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/* wait until new pmode appears in status register */
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value = in_be64(&pmd_regs->pmsr) & 0x07;
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while(value != pmode) {
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cpu_relax();
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value = in_be64(&pmd_regs->pmsr) & 0x07;
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}
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time = jiffies - time;
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time = jiffies_to_msecs(time);
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pr_debug("had to wait %lu ms for a transition using " \
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"the pervasive unit.\n", time);
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#endif
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local_irq_restore(flags);
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return 0;
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}
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static int set_pmode(int cpu, unsigned int slow_mode)
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static int set_pmode(unsigned int cpu, unsigned int slow_mode)
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{
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int rc;
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#ifdef CONFIG_PPC_PMI
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if (cbe_cpufreq_has_pmi)
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rc = set_pmode_pmi(cpu, slow_mode);
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else
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#endif
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rc = set_pmode_reg(cpu, slow_mode);
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pr_debug("register contains slow mode %d\n", get_pmode(cpu));
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if (cbe_cpufreq_has_pmi)
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rc = cbe_cpufreq_set_pmode_pmi(cpu, slow_mode);
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else
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rc = cbe_cpufreq_set_pmode(cpu, slow_mode);
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pr_debug("register contains slow mode %d\n", cbe_cpufreq_get_pmode(cpu));
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return rc;
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}
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static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
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{
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u8 node; slow_mode;
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BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
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node = pmi_msg.data1;
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slow_mode = pmi_msg.data2;
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pmi_slow_mode_limit[node] = slow_mode;
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pr_debug("cbe_handle_pmi: node: %d, max slow_mode=%d\n", slow_mode);
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}
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static int pmi_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct cpufreq_policy *policy = data;
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u8 node;
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node = cbe_cpu_to_node(policy->cpu);
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pr_debug("got notified, event=%lu, node=%u\n", event, node);
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if (pmi_slow_mode_limit[node] != 0) {
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pr_debug("limiting node %d to slow mode %d\n",
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node, pmi_slow_mode_limit[node]);
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cpufreq_verify_within_limits(policy, 0,
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cbe_freqs[pmi_slow_mode_limit[node]].frequency);
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}
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return 0;
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}
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static struct notifier_block pmi_notifier_block = {
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.notifier_call = pmi_notifier,
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};
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static struct pmi_handler cbe_pmi_handler = {
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.type = PMI_TYPE_FREQ_CHANGE,
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.handle_pmi_message = cbe_cpufreq_handle_pmi,
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};
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/*
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* cpufreq functions
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*/
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@ -270,7 +103,7 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
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* of a transition */
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policy->cpuinfo.transition_latency = 25000;
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cur_pmode = get_pmode(policy->cpu);
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cur_pmode = cbe_cpufreq_get_pmode(policy->cpu);
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pr_debug("current pmode is at %d\n",cur_pmode);
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policy->cur = cbe_freqs[cur_pmode].frequency;
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@ -297,7 +130,6 @@ static int cbe_cpufreq_verify(struct cpufreq_policy *policy)
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return cpufreq_frequency_table_verify(policy, cbe_freqs);
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}
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static int cbe_cpufreq_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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@ -352,22 +184,12 @@ static int __init cbe_cpufreq_init(void)
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if (!machine_is(cell))
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return -ENODEV;
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cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
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if (cbe_cpufreq_has_pmi)
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cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
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return cpufreq_register_driver(&cbe_cpufreq_driver);
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}
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static void __exit cbe_cpufreq_exit(void)
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{
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cpufreq_unregister_driver(&cbe_cpufreq_driver);
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if (cbe_cpufreq_has_pmi) {
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cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
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pmi_unregister_handler(&cbe_pmi_handler);
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}
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}
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module_init(cbe_cpufreq_init);
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24
arch/powerpc/platforms/cell/cbe_cpufreq.h
Normal file
24
arch/powerpc/platforms/cell/cbe_cpufreq.h
Normal file
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@ -0,0 +1,24 @@
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/*
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* cbe_cpufreq.h
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*
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* This file contains the definitions used by the cbe_cpufreq driver.
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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*
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*/
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#include <linux/cpufreq.h>
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#include <linux/types.h>
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int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode);
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int cbe_cpufreq_get_pmode(int cpu);
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int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode);
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#if defined(CONFIG_CBE_CPUFREQ_PMI) || defined(CONFIG_CBE_CPUFREQ_PMI_MODULE)
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extern bool cbe_cpufreq_has_pmi;
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#else
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#define cbe_cpufreq_has_pmi (0)
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#endif
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115
arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c
Normal file
115
arch/powerpc/platforms/cell/cbe_cpufreq_pervasive.c
Normal file
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@ -0,0 +1,115 @@
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/*
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* pervasive backend for the cbe_cpufreq driver
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*
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* This driver makes use of the pervasive unit to
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* engage the desired frequency.
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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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 as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <asm/machdep.h>
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#include <asm/hw_irq.h>
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#include "cbe_regs.h"
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#include "cbe_cpufreq.h"
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/* to write to MIC register */
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static u64 MIC_Slow_Fast_Timer_table[] = {
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[0 ... 7] = 0x007fc00000000000ull,
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};
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/* more values for the MIC */
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static u64 MIC_Slow_Next_Timer_table[] = {
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0x0000240000000000ull,
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0x0000268000000000ull,
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0x000029C000000000ull,
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0x00002D0000000000ull,
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0x0000300000000000ull,
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0x0000334000000000ull,
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0x000039C000000000ull,
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0x00003FC000000000ull,
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};
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int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode)
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{
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struct cbe_pmd_regs __iomem *pmd_regs;
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struct cbe_mic_tm_regs __iomem *mic_tm_regs;
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u64 flags;
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u64 value;
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#ifdef DEBUG
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long time;
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#endif
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local_irq_save(flags);
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mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
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pmd_regs = cbe_get_cpu_pmd_regs(cpu);
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#ifdef DEBUG
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time = jiffies;
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#endif
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out_be64(&mic_tm_regs->slow_fast_timer_0, MIC_Slow_Fast_Timer_table[pmode]);
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out_be64(&mic_tm_regs->slow_fast_timer_1, MIC_Slow_Fast_Timer_table[pmode]);
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out_be64(&mic_tm_regs->slow_next_timer_0, MIC_Slow_Next_Timer_table[pmode]);
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out_be64(&mic_tm_regs->slow_next_timer_1, MIC_Slow_Next_Timer_table[pmode]);
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value = in_be64(&pmd_regs->pmcr);
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/* set bits to zero */
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value &= 0xFFFFFFFFFFFFFFF8ull;
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/* set bits to next pmode */
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value |= pmode;
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out_be64(&pmd_regs->pmcr, value);
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#ifdef DEBUG
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/* wait until new pmode appears in status register */
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value = in_be64(&pmd_regs->pmsr) & 0x07;
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while (value != pmode) {
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cpu_relax();
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value = in_be64(&pmd_regs->pmsr) & 0x07;
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}
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time = jiffies - time;
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time = jiffies_to_msecs(time);
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pr_debug("had to wait %lu ms for a transition using " \
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"pervasive unit\n", time);
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#endif
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local_irq_restore(flags);
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return 0;
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}
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int cbe_cpufreq_get_pmode(int cpu)
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{
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int ret;
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struct cbe_pmd_regs __iomem *pmd_regs;
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pmd_regs = cbe_get_cpu_pmd_regs(cpu);
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ret = in_be64(&pmd_regs->pmsr) & 0x07;
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return ret;
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}
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148
arch/powerpc/platforms/cell/cbe_cpufreq_pmi.c
Normal file
148
arch/powerpc/platforms/cell/cbe_cpufreq_pmi.c
Normal file
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@ -0,0 +1,148 @@
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/*
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* pmi backend for the cbe_cpufreq driver
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
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*
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* Author: Christian Krafft <krafft@de.ibm.com>
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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 as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/timer.h>
|
||||
#include <asm/of_platform.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/prom.h>
|
||||
#include <asm/pmi.h>
|
||||
|
||||
#ifdef DEBUG
|
||||
#include <asm/time.h>
|
||||
#endif
|
||||
|
||||
#include "cbe_regs.h"
|
||||
#include "cbe_cpufreq.h"
|
||||
|
||||
static u8 pmi_slow_mode_limit[MAX_CBE];
|
||||
|
||||
bool cbe_cpufreq_has_pmi = false;
|
||||
EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);
|
||||
|
||||
/*
|
||||
* hardware specific functions
|
||||
*/
|
||||
|
||||
int cbe_cpufreq_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);
|
||||
|
||||
#ifdef DEBUG
|
||||
time = jiffies - time;
|
||||
time = jiffies_to_msecs(time);
|
||||
pr_debug("had to wait %lu ms for a transition using " \
|
||||
"PMI\n", time);
|
||||
#endif
|
||||
ret = pmi_msg.data2;
|
||||
pr_debug("PMI returned slow mode %d\n", ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi);
|
||||
|
||||
|
||||
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_freq: %d\n", node, slow_mode);
|
||||
}
|
||||
|
||||
static int pmi_notifier(struct notifier_block *nb,
|
||||
unsigned long event, void *data)
|
||||
{
|
||||
struct cpufreq_policy *policy = data;
|
||||
struct cpufreq_frequency_table *cbe_freqs;
|
||||
u8 node;
|
||||
|
||||
cbe_freqs = cpufreq_frequency_get_table(policy->cpu);
|
||||
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,
|
||||
};
|
||||
|
||||
|
||||
|
||||
static int __init cbe_cpufreq_pmi_init(void)
|
||||
{
|
||||
cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
|
||||
|
||||
if (!cbe_cpufreq_has_pmi)
|
||||
return -ENODEV;
|
||||
|
||||
cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit cbe_cpufreq_pmi_exit(void)
|
||||
{
|
||||
cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
|
||||
pmi_unregister_handler(&cbe_pmi_handler);
|
||||
}
|
||||
|
||||
module_init(cbe_cpufreq_pmi_init);
|
||||
module_exit(cbe_cpufreq_pmi_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
|
||||
Loading…
Reference in a new issue