de6cc6515a
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 77 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.837555891@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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#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 <asm/cell-regs.h>
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#include "ppc_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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unsigned long 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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