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-rw-r--r--arch/powerpc/platforms/pasemi/cpufreq.c330
1 files changed, 0 insertions, 330 deletions
diff --git a/arch/powerpc/platforms/pasemi/cpufreq.c b/arch/powerpc/platforms/pasemi/cpufreq.c
deleted file mode 100644
index be1e7958909e..000000000000
--- a/arch/powerpc/platforms/pasemi/cpufreq.c
+++ /dev/null
@@ -1,330 +0,0 @@
-/*
- * Copyright (C) 2007 PA Semi, Inc
- *
- * Authors: Egor Martovetsky <egor@pasemi.com>
- * Olof Johansson <olof@lixom.net>
- *
- * Maintained by: Olof Johansson <olof@lixom.net>
- *
- * Based on arch/powerpc/platforms/cell/cbe_cpufreq.c:
- * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
- *
- * 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 <linux/module.h>
-
-#include <asm/hw_irq.h>
-#include <asm/io.h>
-#include <asm/prom.h>
-#include <asm/time.h>
-#include <asm/smp.h>
-
-#define SDCASR_REG 0x0100
-#define SDCASR_REG_STRIDE 0x1000
-#define SDCPWR_CFGA0_REG 0x0100
-#define SDCPWR_PWST0_REG 0x0000
-#define SDCPWR_GIZTIME_REG 0x0440
-
-/* SDCPWR_GIZTIME_REG fields */
-#define SDCPWR_GIZTIME_GR 0x80000000
-#define SDCPWR_GIZTIME_LONGLOCK 0x000000ff
-
-/* Offset of ASR registers from SDC base */
-#define SDCASR_OFFSET 0x120000
-
-static void __iomem *sdcpwr_mapbase;
-static void __iomem *sdcasr_mapbase;
-
-static DEFINE_MUTEX(pas_switch_mutex);
-
-/* Current astate, is used when waking up from power savings on
- * one core, in case the other core has switched states during
- * the idle time.
- */
-static int current_astate;
-
-/* We support 5(A0-A4) power states excluding turbo(A5-A6) modes */
-static struct cpufreq_frequency_table pas_freqs[] = {
- {0, 0},
- {1, 0},
- {2, 0},
- {3, 0},
- {4, 0},
- {0, CPUFREQ_TABLE_END},
-};
-
-static struct freq_attr *pas_cpu_freqs_attr[] = {
- &cpufreq_freq_attr_scaling_available_freqs,
- NULL,
-};
-
-/*
- * hardware specific functions
- */
-
-static int get_astate_freq(int astate)
-{
- u32 ret;
- ret = in_le32(sdcpwr_mapbase + SDCPWR_CFGA0_REG + (astate * 0x10));
-
- return ret & 0x3f;
-}
-
-static int get_cur_astate(int cpu)
-{
- u32 ret;
-
- ret = in_le32(sdcpwr_mapbase + SDCPWR_PWST0_REG);
- ret = (ret >> (cpu * 4)) & 0x7;
-
- return ret;
-}
-
-static int get_gizmo_latency(void)
-{
- u32 giztime, ret;
-
- giztime = in_le32(sdcpwr_mapbase + SDCPWR_GIZTIME_REG);
-
- /* just provide the upper bound */
- if (giztime & SDCPWR_GIZTIME_GR)
- ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 128000;
- else
- ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 1000;
-
- return ret;
-}
-
-static void set_astate(int cpu, unsigned int astate)
-{
- unsigned long flags;
-
- /* Return if called before init has run */
- if (unlikely(!sdcasr_mapbase))
- return;
-
- local_irq_save(flags);
-
- out_le32(sdcasr_mapbase + SDCASR_REG + SDCASR_REG_STRIDE*cpu, astate);
-
- local_irq_restore(flags);
-}
-
-int check_astate(void)
-{
- return get_cur_astate(hard_smp_processor_id());
-}
-
-void restore_astate(int cpu)
-{
- set_astate(cpu, current_astate);
-}
-
-/*
- * cpufreq functions
- */
-
-static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
-{
- const u32 *max_freqp;
- u32 max_freq;
- int i, cur_astate;
- struct resource res;
- struct device_node *cpu, *dn;
- int err = -ENODEV;
-
- cpu = of_get_cpu_node(policy->cpu, NULL);
-
- if (!cpu)
- goto out;
-
- dn = of_find_compatible_node(NULL, NULL, "1682m-sdc");
- if (!dn)
- dn = of_find_compatible_node(NULL, NULL,
- "pasemi,pwrficient-sdc");
- if (!dn)
- goto out;
- err = of_address_to_resource(dn, 0, &res);
- of_node_put(dn);
- if (err)
- goto out;
- sdcasr_mapbase = ioremap(res.start + SDCASR_OFFSET, 0x2000);
- if (!sdcasr_mapbase) {
- err = -EINVAL;
- goto out;
- }
-
- dn = of_find_compatible_node(NULL, NULL, "1682m-gizmo");
- if (!dn)
- dn = of_find_compatible_node(NULL, NULL,
- "pasemi,pwrficient-gizmo");
- if (!dn) {
- err = -ENODEV;
- goto out_unmap_sdcasr;
- }
- err = of_address_to_resource(dn, 0, &res);
- of_node_put(dn);
- if (err)
- goto out_unmap_sdcasr;
- sdcpwr_mapbase = ioremap(res.start, 0x1000);
- if (!sdcpwr_mapbase) {
- err = -EINVAL;
- goto out_unmap_sdcasr;
- }
-
- pr_debug("init cpufreq on CPU %d\n", policy->cpu);
-
- max_freqp = of_get_property(cpu, "clock-frequency", NULL);
- if (!max_freqp) {
- err = -EINVAL;
- goto out_unmap_sdcpwr;
- }
-
- /* 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; pas_freqs[i].frequency!=CPUFREQ_TABLE_END; i++) {
- pas_freqs[i].frequency = get_astate_freq(pas_freqs[i].index) * 100000;
- pr_debug("%d: %d\n", i, pas_freqs[i].frequency);
- }
-
- policy->cpuinfo.transition_latency = get_gizmo_latency();
-
- cur_astate = get_cur_astate(policy->cpu);
- pr_debug("current astate is at %d\n",cur_astate);
-
- policy->cur = pas_freqs[cur_astate].frequency;
- cpumask_copy(policy->cpus, cpu_online_mask);
-
- ppc_proc_freq = policy->cur * 1000ul;
-
- cpufreq_frequency_table_get_attr(pas_freqs, policy->cpu);
-
- /* this ensures that policy->cpuinfo_min and policy->cpuinfo_max
- * are set correctly
- */
- return cpufreq_frequency_table_cpuinfo(policy, pas_freqs);
-
-out_unmap_sdcpwr:
- iounmap(sdcpwr_mapbase);
-
-out_unmap_sdcasr:
- iounmap(sdcasr_mapbase);
-out:
- return err;
-}
-
-static int pas_cpufreq_cpu_exit(struct cpufreq_policy *policy)
-{
- /*
- * We don't support CPU hotplug. Don't unmap after the system
- * has already made it to a running state.
- */
- if (system_state != SYSTEM_BOOTING)
- return 0;
-
- if (sdcasr_mapbase)
- iounmap(sdcasr_mapbase);
- if (sdcpwr_mapbase)
- iounmap(sdcpwr_mapbase);
-
- cpufreq_frequency_table_put_attr(policy->cpu);
- return 0;
-}
-
-static int pas_cpufreq_verify(struct cpufreq_policy *policy)
-{
- return cpufreq_frequency_table_verify(policy, pas_freqs);
-}
-
-static int pas_cpufreq_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
-{
- struct cpufreq_freqs freqs;
- int pas_astate_new;
- int i;
-
- cpufreq_frequency_table_target(policy,
- pas_freqs,
- target_freq,
- relation,
- &pas_astate_new);
-
- freqs.old = policy->cur;
- freqs.new = pas_freqs[pas_astate_new].frequency;
-
- mutex_lock(&pas_switch_mutex);
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
-
- pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n",
- policy->cpu,
- pas_freqs[pas_astate_new].frequency,
- pas_freqs[pas_astate_new].index);
-
- current_astate = pas_astate_new;
-
- for_each_online_cpu(i)
- set_astate(i, pas_astate_new);
-
- cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
- mutex_unlock(&pas_switch_mutex);
-
- ppc_proc_freq = freqs.new * 1000ul;
- return 0;
-}
-
-static struct cpufreq_driver pas_cpufreq_driver = {
- .name = "pas-cpufreq",
- .owner = THIS_MODULE,
- .flags = CPUFREQ_CONST_LOOPS,
- .init = pas_cpufreq_cpu_init,
- .exit = pas_cpufreq_cpu_exit,
- .verify = pas_cpufreq_verify,
- .target = pas_cpufreq_target,
- .attr = pas_cpu_freqs_attr,
-};
-
-/*
- * module init and destoy
- */
-
-static int __init pas_cpufreq_init(void)
-{
- if (!of_machine_is_compatible("PA6T-1682M") &&
- !of_machine_is_compatible("pasemi,pwrficient"))
- return -ENODEV;
-
- return cpufreq_register_driver(&pas_cpufreq_driver);
-}
-
-static void __exit pas_cpufreq_exit(void)
-{
- cpufreq_unregister_driver(&pas_cpufreq_driver);
-}
-
-module_init(pas_cpufreq_init);
-module_exit(pas_cpufreq_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>, Olof Johansson <olof@lixom.net>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 13:03:18 +0100