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SPARC/LEON: power down instruction different of different LEONs

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The way a LEON is powered down is implemented differently depending
on CHIP type. The AMBA Plug&Play system ID tells revision of GRLIB
and CHIP.

This is for example needed by the GR-LEON4-ITX board and the UT699.

Previously the power down support for LEON was limited to SMP, now
both SMP and UP systems use the instruction.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Hellstrom 2011-01-27 01:26:58 +00:00 committed by David S. Miller
parent 684151a75b
commit 7279b82cb1
5 changed files with 97 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/sparc/include/asm/leon_amba.h
View File

@ -180,6 +180,7 @@ struct amba_ahb_device {
struct device_node;
void _amba_init(struct device_node *dp, struct device_node ***nextp);
extern unsigned long amba_system_id;
extern struct leon3_irqctrl_regs_map *leon3_irqctrl_regs;
extern struct leon3_gptimer_regs_map *leon3_gptimer_regs;
extern struct amba_apb_device leon_percpu_timer_dev[16];
@ -254,6 +255,11 @@ extern unsigned int sparc_leon_eirq;
#define GAISLER_L2C 0xffe /* internal device: leon2compat */
#define GAISLER_PLUGPLAY 0xfff /* internal device: plug & play configarea */
/* Chip IDs */
#define AEROFLEX_UT699 0x0699
#define LEON4_NEXTREME1 0x0102
#define GAISLER_GR712RC 0x0712
#define amba_vendor(x) (((x) >> 24) & 0xff)
#define amba_device(x) (((x) >> 12) & 0xfff)

1
arch/sparc/kernel/Makefile
View File

@ -54,6 +54,7 @@ obj-y += of_device_$(BITS).o
obj-$(CONFIG_SPARC64) += prom_irqtrans.o
obj-$(CONFIG_SPARC_LEON)+= leon_kernel.o
obj-$(CONFIG_SPARC_LEON)+= leon_pmc.o
obj-$(CONFIG_SPARC64) += reboot.o
obj-$(CONFIG_SPARC64) += sysfs.o

9
arch/sparc/kernel/leon_kernel.c
View File

@ -30,6 +30,7 @@ struct amba_apb_device leon_percpu_timer_dev[16];
int leondebug_irq_disable;
int leon_debug_irqout;
static int dummy_master_l10_counter;
unsigned long amba_system_id;
unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
@ -117,10 +118,16 @@ void __init leon_init_timers(irq_handler_t counter_fn)
master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
dummy_master_l10_counter = 0;
/*Find IRQMP IRQ Controller Registers base address otherwise bail out.*/
rootnp = of_find_node_by_path("/ambapp0");
if (!rootnp)
goto bad;
/* Find System ID: GRLIB build ID and optional CHIP ID */
pp = of_find_property(rootnp, "systemid", &len);
if (pp)
amba_system_id = *(unsigned long *)pp->value;
/* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
if (!np) {
np = of_find_node_by_name(rootnp, "01_00d");

82
arch/sparc/kernel/leon_pmc.c Normal file
View File

@ -0,0 +1,82 @@
/* 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/leon.h>
/* List of Systems that need fixup instructions around power-down instruction */
unsigned int pmc_leon_fixup_ids[] = {
AEROFLEX_UT699,
GAISLER_GR712RC,
LEON4_NEXTREME1,
0
};
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;
}
/*
* CPU idle callback function for systems that need some extra handling
* See .../arch/sparc/kernel/process.c
*/
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;
__asm__ __volatile__ (
"mov %%g0, %%asr19\n"
"lda [%0] %1, %%g0\n"
:
: "r"(address), "i"(ASI_LEON_BYPASS));
}
/*
* CPU idle callback function
* See .../arch/sparc/kernel/process.c
*/
void pmc_leon_idle(void)
{
/* For systems without power-down, this will be no-op */
__asm__ __volatile__ ("mov %g0, %asr19\n\t");
}
/* Install LEON Power Down function */
static int __init leon_pmc_install(void)
{
/* Assign power management IDLE handler */
if (pmc_leon_need_fixup())
pm_idle = pmc_leon_idle_fixup;
else
pm_idle = pmc_leon_idle;
printk(KERN_INFO "leon: power management initialized\n");
return 0;
}
/* This driver is not critical to the boot process, don't care
* if initialized late.
*/
late_initcall(leon_pmc_install);

16
arch/sparc/kernel/leon_smp.c
View File

@ -437,15 +437,6 @@ void __init leon_blackbox_current(unsigned *addr)
}
/*
* CPU idle callback function
* See .../arch/sparc/kernel/process.c
*/
void pmc_leon_idle(void)
{
__asm__ volatile ("mov %g0, %asr19");
}
void __init leon_init_smp(void)
{
/* Patch ipi15 trap table */
@ -456,13 +447,6 @@ void __init leon_init_smp(void)
BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
BTFIXUPCALL_NORM);
#ifndef PMC_NO_IDLE
/* Assign power management IDLE handler */
pm_idle = pmc_leon_idle;
printk(KERN_INFO "leon: power management initialized\n");
#endif
}
#endif /* CONFIG_SPARC_LEON */