Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * pervasive backend for the cbe_cpufreq driver
 *
 * This driver makes use of the pervasive unit to
 * engage the desired frequency.
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
 *
 * Author: Christian Krafft <krafft@de.ibm.com>
 */
 
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <asm/machdep.h>
#include <asm/hw_irq.h>
#include <asm/cell-regs.h>
 
#include "ppc_cbe_cpufreq.h"
 
/* 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,
};
 
 
int cbe_cpufreq_set_pmode(int cpu, unsigned int pmode)
{
<------>struct cbe_pmd_regs __iomem *pmd_regs;
<------>struct cbe_mic_tm_regs __iomem *mic_tm_regs;
<------>unsigned long flags;
<------>u64 value;
#ifdef DEBUG
<------>long time;
#endif
 
<------>local_irq_save(flags);
 
<------>mic_tm_regs = cbe_get_cpu_mic_tm_regs(cpu);
<------>pmd_regs = cbe_get_cpu_pmd_regs(cpu);
 
#ifdef DEBUG
<------>time = jiffies;
#endif
 
<------>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);
 
#ifdef DEBUG
<------>/* 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;
<------>}
 
<------>time = jiffies  - time;
<------>time = jiffies_to_msecs(time);
<------>pr_debug("had to wait %lu ms for a transition using " \
<------><------> "pervasive unit\n", time);
#endif
<------>local_irq_restore(flags);
 
<------>return 0;
}
 
 
int cbe_cpufreq_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;
}