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c4dcc8a162
It always returns 0 (success) and its return type should really be void. Over that, many drivers have added error handling code based on its return value, which is not required at all. Change its return type to void and update all the callers. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
280 lines
6.0 KiB
C
280 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2007 PA Semi, Inc
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*
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* Authors: Egor Martovetsky <egor@pasemi.com>
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* Olof Johansson <olof@lixom.net>
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*
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* Maintained by: Olof Johansson <olof@lixom.net>
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*
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* Based on arch/powerpc/platforms/cell/cbe_cpufreq.c:
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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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 <linux/module.h>
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#include <linux/of_address.h>
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#include <asm/hw_irq.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/time.h>
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#include <asm/smp.h>
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#define SDCASR_REG 0x0100
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#define SDCASR_REG_STRIDE 0x1000
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#define SDCPWR_CFGA0_REG 0x0100
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#define SDCPWR_PWST0_REG 0x0000
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#define SDCPWR_GIZTIME_REG 0x0440
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/* SDCPWR_GIZTIME_REG fields */
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#define SDCPWR_GIZTIME_GR 0x80000000
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#define SDCPWR_GIZTIME_LONGLOCK 0x000000ff
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/* Offset of ASR registers from SDC base */
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#define SDCASR_OFFSET 0x120000
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static void __iomem *sdcpwr_mapbase;
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static void __iomem *sdcasr_mapbase;
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/* Current astate, is used when waking up from power savings on
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* one core, in case the other core has switched states during
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* the idle time.
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*/
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static int current_astate;
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/* We support 5(A0-A4) power states excluding turbo(A5-A6) modes */
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static struct cpufreq_frequency_table pas_freqs[] = {
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{0, 0, 0},
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{0, 1, 0},
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{0, 2, 0},
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{0, 3, 0},
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{0, 4, 0},
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{0, 0, CPUFREQ_TABLE_END},
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};
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/*
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* hardware specific functions
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*/
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static int get_astate_freq(int astate)
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{
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u32 ret;
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ret = in_le32(sdcpwr_mapbase + SDCPWR_CFGA0_REG + (astate * 0x10));
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return ret & 0x3f;
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}
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static int get_cur_astate(int cpu)
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{
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u32 ret;
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ret = in_le32(sdcpwr_mapbase + SDCPWR_PWST0_REG);
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ret = (ret >> (cpu * 4)) & 0x7;
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return ret;
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}
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static int get_gizmo_latency(void)
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{
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u32 giztime, ret;
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giztime = in_le32(sdcpwr_mapbase + SDCPWR_GIZTIME_REG);
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/* just provide the upper bound */
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if (giztime & SDCPWR_GIZTIME_GR)
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ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 128000;
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else
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ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 1000;
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return ret;
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}
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static void set_astate(int cpu, unsigned int astate)
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{
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unsigned long flags;
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/* Return if called before init has run */
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if (unlikely(!sdcasr_mapbase))
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return;
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local_irq_save(flags);
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out_le32(sdcasr_mapbase + SDCASR_REG + SDCASR_REG_STRIDE*cpu, astate);
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local_irq_restore(flags);
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}
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int check_astate(void)
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{
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return get_cur_astate(hard_smp_processor_id());
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}
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void restore_astate(int cpu)
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{
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set_astate(cpu, current_astate);
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}
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/*
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* cpufreq functions
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*/
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static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
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{
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struct cpufreq_frequency_table *pos;
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const u32 *max_freqp;
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u32 max_freq;
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int cur_astate, idx;
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struct resource res;
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struct device_node *cpu, *dn;
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int err = -ENODEV;
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cpu = of_get_cpu_node(policy->cpu, NULL);
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of_node_put(cpu);
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if (!cpu)
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goto out;
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dn = of_find_compatible_node(NULL, NULL, "1682m-sdc");
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if (!dn)
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dn = of_find_compatible_node(NULL, NULL,
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"pasemi,pwrficient-sdc");
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if (!dn)
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goto out;
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err = of_address_to_resource(dn, 0, &res);
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of_node_put(dn);
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if (err)
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goto out;
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sdcasr_mapbase = ioremap(res.start + SDCASR_OFFSET, 0x2000);
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if (!sdcasr_mapbase) {
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err = -EINVAL;
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goto out;
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}
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dn = of_find_compatible_node(NULL, NULL, "1682m-gizmo");
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if (!dn)
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dn = of_find_compatible_node(NULL, NULL,
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"pasemi,pwrficient-gizmo");
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if (!dn) {
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err = -ENODEV;
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goto out_unmap_sdcasr;
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}
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err = of_address_to_resource(dn, 0, &res);
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of_node_put(dn);
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if (err)
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goto out_unmap_sdcasr;
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sdcpwr_mapbase = ioremap(res.start, 0x1000);
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if (!sdcpwr_mapbase) {
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err = -EINVAL;
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goto out_unmap_sdcasr;
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}
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pr_debug("init cpufreq on CPU %d\n", policy->cpu);
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max_freqp = of_get_property(cpu, "clock-frequency", NULL);
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if (!max_freqp) {
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err = -EINVAL;
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goto out_unmap_sdcpwr;
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}
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/* we need the freq in kHz */
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max_freq = *max_freqp / 1000;
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pr_debug("max clock-frequency is at %u kHz\n", max_freq);
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pr_debug("initializing frequency table\n");
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/* initialize frequency table */
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cpufreq_for_each_entry_idx(pos, pas_freqs, idx) {
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pos->frequency = get_astate_freq(pos->driver_data) * 100000;
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pr_debug("%d: %d\n", idx, pos->frequency);
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}
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cur_astate = get_cur_astate(policy->cpu);
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pr_debug("current astate is at %d\n",cur_astate);
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policy->cur = pas_freqs[cur_astate].frequency;
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ppc_proc_freq = policy->cur * 1000ul;
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cpufreq_generic_init(policy, pas_freqs, get_gizmo_latency());
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return 0;
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out_unmap_sdcpwr:
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iounmap(sdcpwr_mapbase);
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out_unmap_sdcasr:
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iounmap(sdcasr_mapbase);
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out:
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return err;
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}
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static int pas_cpufreq_cpu_exit(struct cpufreq_policy *policy)
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{
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/*
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* We don't support CPU hotplug. Don't unmap after the system
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* has already made it to a running state.
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*/
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if (system_state >= SYSTEM_RUNNING)
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return 0;
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if (sdcasr_mapbase)
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iounmap(sdcasr_mapbase);
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if (sdcpwr_mapbase)
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iounmap(sdcpwr_mapbase);
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return 0;
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}
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static int pas_cpufreq_target(struct cpufreq_policy *policy,
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unsigned int pas_astate_new)
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{
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int i;
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pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n",
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policy->cpu,
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pas_freqs[pas_astate_new].frequency,
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pas_freqs[pas_astate_new].driver_data);
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current_astate = pas_astate_new;
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for_each_online_cpu(i)
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set_astate(i, pas_astate_new);
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ppc_proc_freq = pas_freqs[pas_astate_new].frequency * 1000ul;
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return 0;
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}
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static struct cpufreq_driver pas_cpufreq_driver = {
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.name = "pas-cpufreq",
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.flags = CPUFREQ_CONST_LOOPS,
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.init = pas_cpufreq_cpu_init,
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.exit = pas_cpufreq_cpu_exit,
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.verify = cpufreq_generic_frequency_table_verify,
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.target_index = pas_cpufreq_target,
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.attr = cpufreq_generic_attr,
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};
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/*
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* module init and destoy
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*/
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static int __init pas_cpufreq_init(void)
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{
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if (!of_machine_is_compatible("PA6T-1682M") &&
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!of_machine_is_compatible("pasemi,pwrficient"))
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return -ENODEV;
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return cpufreq_register_driver(&pas_cpufreq_driver);
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}
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static void __exit pas_cpufreq_exit(void)
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{
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cpufreq_unregister_driver(&pas_cpufreq_driver);
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}
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module_init(pas_cpufreq_init);
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module_exit(pas_cpufreq_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>, Olof Johansson <olof@lixom.net>");
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