Release 4.14 arch/sparc/kernel/leon_pmc.c
// SPDX-License-Identifier: GPL-2.0
/* leon_pmc.c: LEON Power-down cpu_idle() handler
*
* Copyright (C) 2011 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
*/
#include <linux/init.h>
#include <linux/pm.h>
#include <asm/leon_amba.h>
#include <asm/cpu_type.h>
#include <asm/leon.h>
#include <asm/processor.h>
/* List of Systems that need fixup instructions around power-down instruction */
static unsigned int pmc_leon_fixup_ids[] = {
AEROFLEX_UT699,
GAISLER_GR712RC,
LEON4_NEXTREME1,
0
};
static int pmc_leon_need_fixup(void)
{
unsigned int systemid = amba_system_id >> 16;
unsigned int *id;
id = &pmc_leon_fixup_ids[0];
while (*id != 0) {
if (*id == systemid)
return 1;
id++;
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Hellstrom | 53 | 98.15% | 1 | 50.00% |
| Sam Ravnborg | 1 | 1.85% | 1 | 50.00% |
| Total | 54 | 100.00% | 2 | 100.00% |
/*
* CPU idle callback function for systems that need some extra handling
* See .../arch/sparc/kernel/process.c
*/
static void pmc_leon_idle_fixup(void)
{
/* Prepare an address to a non-cachable region. APB is always
* none-cachable. One instruction is executed after the Sleep
* instruction, we make sure to read the bus and throw away the
* value by accessing a non-cachable area, also we make sure the
* MMU does not get a TLB miss here by using the MMU BYPASS ASI.
*/
register unsigned int address = (unsigned int)leon3_irqctrl_regs;
/* Interrupts need to be enabled to not hang the CPU */
local_irq_enable();
__asm__ __volatile__ (
"wr %%g0, %%asr19\n"
"lda [%0] %1, %%g0\n"
:
: "r"(address), "i"(ASI_LEON_BYPASS));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Hellstrom | 21 | 77.78% | 1 | 25.00% |
| Andreas Larsson | 4 | 14.81% | 1 | 25.00% |
| David S. Miller | 1 | 3.70% | 1 | 25.00% |
| Sam Ravnborg | 1 | 3.70% | 1 | 25.00% |
| Total | 27 | 100.00% | 4 | 100.00% |
/*
* CPU idle callback function
* See .../arch/sparc/kernel/process.c
*/
static void pmc_leon_idle(void)
{
/* Interrupts need to be enabled to not hang the CPU */
local_irq_enable();
/* For systems without power-down, this will be no-op */
__asm__ __volatile__ ("wr %g0, %asr19\n\t");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Hellstrom | 10 | 62.50% | 1 | 25.00% |
| Andreas Larsson | 4 | 25.00% | 1 | 25.00% |
| David S. Miller | 1 | 6.25% | 1 | 25.00% |
| Sam Ravnborg | 1 | 6.25% | 1 | 25.00% |
| Total | 16 | 100.00% | 4 | 100.00% |
/* Install LEON Power Down function */
static int __init leon_pmc_install(void)
{
if (sparc_cpu_model == sparc_leon) {
/* Assign power management IDLE handler */
if (pmc_leon_need_fixup())
sparc_idle = pmc_leon_idle_fixup;
else
sparc_idle = pmc_leon_idle;
printk(KERN_INFO "leon: power management initialized\n");
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Hellstrom | 31 | 75.61% | 1 | 33.33% |
| Sam Ravnborg | 8 | 19.51% | 1 | 33.33% |
| Len Brown | 2 | 4.88% | 1 | 33.33% |
| Total | 41 | 100.00% | 3 | 100.00% |
/* This driver is not critical to the boot process, don't care
* if initialized late.
*/
late_initcall(leon_pmc_install);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Daniel Hellstrom | 153 | 83.15% | 1 | 14.29% |
| Sam Ravnborg | 15 | 8.15% | 2 | 28.57% |
| Andreas Larsson | 8 | 4.35% | 1 | 14.29% |
| Len Brown | 5 | 2.72% | 1 | 14.29% |
| David S. Miller | 2 | 1.09% | 1 | 14.29% |
| Greg Kroah-Hartman | 1 | 0.54% | 1 | 14.29% |
| Total | 184 | 100.00% | 7 | 100.00% |
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