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Diffstat (limited to 'arch/powerpc/platforms/cell/cbe_cpufreq.c')
-rw-r--r--arch/powerpc/platforms/cell/cbe_cpufreq.c332
1 files changed, 0 insertions, 332 deletions
diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.c b/arch/powerpc/platforms/cell/cbe_cpufreq.c
deleted file mode 100644
index f9ac3fe3be9..00000000000
--- a/arch/powerpc/platforms/cell/cbe_cpufreq.c
+++ /dev/null
@@ -1,332 +0,0 @@
-/*
- * cpufreq driver for the cell processor
- *
- * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
- *
- * Author: Christian Krafft <krafft@de.ibm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * 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/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"
-
-static DEFINE_MUTEX(cbe_switch_mutex);
-
-
-/* the CBE supports an 8 step frequency scaling */
-static struct cpufreq_frequency_table cbe_freqs[] = {
- {1, 0},
- {2, 0},
- {3, 0},
- {4, 0},
- {5, 0},
- {6, 0},
- {8, 0},
- {10, 0},
- {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,
-};
-
-/*
- * hardware specific functions
- */
-
-static struct of_device *pmi_dev;
-
-static int set_pmode_pmi(int cpu, unsigned int pmode)
-{
- int ret;
- pmi_message_t pmi_msg;
-#ifdef DEBUG
- u64 time;
-#endif
-
- pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
- pmi_msg.data1 = cbe_cpu_to_node(cpu);
- pmi_msg.data2 = pmode;
-
-#ifdef DEBUG
- time = (u64) get_cycles();
-#endif
-
- pmi_send_message(pmi_dev, pmi_msg);
- ret = pmi_msg.data2;
-
- pr_debug("PMI returned slow mode %d\n", ret);
-
-#ifdef DEBUG
- time = (u64) get_cycles() - time; /* actual cycles (not cpu cycles!) */
- time = 1000000000 * time / CLOCK_TICK_RATE; /* time in ns (10^-9) */
- pr_debug("had to wait %lu ns for a transition\n", time);
-#endif
- return ret;
-}
-
-
-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;
-
- local_irq_save(flags);
-
- mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
- pmd_regs = cbe_get_cpu_pmd_regs(cpu);
-
- pr_debug("pm register is mapped at %p\n", &pmd_regs->pmcr);
- pr_debug("mic register is mapped at %p\n", &mic_tm_regs->slow_fast_timer_0);
-
- 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);
-
- /* 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;
- }
-
- local_irq_restore(flags);
-
- return 0;
-}
-
-static int set_pmode(int cpu, unsigned int slow_mode) {
- if (pmi_dev)
- return set_pmode_pmi(cpu, slow_mode);
- else
- return set_pmode_reg(cpu, slow_mode);
-}
-
-static void cbe_cpufreq_handle_pmi(struct of_device *dev, pmi_message_t pmi_msg)
-{
- struct cpufreq_policy policy;
- u8 cpu;
- u8 cbe_pmode_new;
-
- BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
-
- cpu = cbe_node_to_cpu(pmi_msg.data1);
- cbe_pmode_new = pmi_msg.data2;
-
- cpufreq_get_policy(&policy, cpu);
-
- policy.max = min(policy.max, cbe_freqs[cbe_pmode_new].frequency);
- policy.min = min(policy.min, policy.max);
-
- pr_debug("cbe_handle_pmi: new policy.min=%d policy.max=%d\n", policy.min, policy.max);
- cpufreq_set_policy(&policy);
-}
-
-static struct pmi_handler cbe_pmi_handler = {
- .type = PMI_TYPE_FREQ_CHANGE,
- .handle_pmi_message = cbe_cpufreq_handle_pmi,
-};
-
-
-/*
- * cpufreq functions
- */
-
-static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
-{
- const u32 *max_freqp;
- u32 max_freq;
- int i, cur_pmode;
- struct device_node *cpu;
-
- cpu = of_get_cpu_node(policy->cpu, NULL);
-
- if (!cpu)
- return -ENODEV;
-
- pr_debug("init cpufreq on CPU %d\n", policy->cpu);
-
- max_freqp = of_get_property(cpu, "clock-frequency", NULL);
-
- if (!max_freqp)
- return -EINVAL;
-
- /* we need the freq in kHz */
- max_freq = *max_freqp / 1000;
-
- pr_debug("max clock-frequency is at %u kHz\n", max_freq);
- pr_debug("initializing frequency table\n");
-
- /* initialize frequency table */
- for (i=0; cbe_freqs[i].frequency!=CPUFREQ_TABLE_END; i++) {
- cbe_freqs[i].frequency = max_freq / cbe_freqs[i].index;
- pr_debug("%d: %d\n", i, cbe_freqs[i].frequency);
- }
-
- policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
- /* if DEBUG is enabled set_pmode() measures the correct latency of a transition */
- policy->cpuinfo.transition_latency = 25000;
-
- cur_pmode = get_pmode(policy->cpu);
- pr_debug("current pmode is at %d\n",cur_pmode);
-
- policy->cur = cbe_freqs[cur_pmode].frequency;
-
-#ifdef CONFIG_SMP
- policy->cpus = cpu_sibling_map[policy->cpu];
-#endif
-
- cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu);
-
- /* this ensures that policy->cpuinfo_min and policy->cpuinfo_max are set correctly */
- return cpufreq_frequency_table_cpuinfo(policy, cbe_freqs);
-}
-
-static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
-{
- cpufreq_frequency_table_put_attr(policy->cpu);
- return 0;
-}
-
-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)
-{
- int rc;
- struct cpufreq_freqs freqs;
- int cbe_pmode_new;
-
- cpufreq_frequency_table_target(policy,
- cbe_freqs,
- target_freq,
- relation,
- &cbe_pmode_new);
-
- freqs.old = policy->cur;
- freqs.new = cbe_freqs[cbe_pmode_new].frequency;
- freqs.cpu = policy->cpu;
-
- mutex_lock(&cbe_switch_mutex);
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
-
- pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n",
- policy->cpu,
- cbe_freqs[cbe_pmode_new].frequency,
- cbe_freqs[cbe_pmode_new].index);
-
- rc = set_pmode(policy->cpu, cbe_pmode_new);
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- mutex_unlock(&cbe_switch_mutex);
-
- return rc;
-}
-
-static struct cpufreq_driver cbe_cpufreq_driver = {
- .verify = cbe_cpufreq_verify,
- .target = cbe_cpufreq_target,
- .init = cbe_cpufreq_cpu_init,
- .exit = cbe_cpufreq_cpu_exit,
- .name = "cbe-cpufreq",
- .owner = THIS_MODULE,
- .flags = CPUFREQ_CONST_LOOPS,
-};
-
-/*
- * module init and destoy
- */
-
-static int __init cbe_cpufreq_init(void)
-{
- struct device_node *np;
-
- if (!machine_is(cell))
- return -ENODEV;
-
- np = of_find_node_by_type(NULL, "ibm,pmi");
-
- pmi_dev = of_find_device_by_node(np);
-
- if (pmi_dev)
- pmi_register_handler(pmi_dev, &cbe_pmi_handler);
-
- return cpufreq_register_driver(&cbe_cpufreq_driver);
-}
-
-static void __exit cbe_cpufreq_exit(void)
-{
- if (pmi_dev)
- pmi_unregister_handler(pmi_dev, &cbe_pmi_handler);
-
- cpufreq_unregister_driver(&cbe_cpufreq_driver);
-}
-
-module_init(cbe_cpufreq_init);
-module_exit(cbe_cpufreq_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-12 20:07:09 +0000