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102 lines
2.2 KiB
102 lines
2.2 KiB
// 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 <[email protected]> |
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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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