ARM: shmobile: R-Mobile: Add DT support for PM domains
Populate the PM domains from DT, and provide support to hook up devices to their respective PM domain. The always-on power area (e.g. C5 on r8a7740) is created as a PM domain without software control, to allow Run-Time management of module clocks for hardware blocks inside this area. Special cases like PM domains containing CPUs, the console device, or Coresight-ETM, are handled by scanning the DT topology. As long as the ARM debug/perf code doesn't use resource management with runtime PM support, the power area containing Coresight-ETM (e.g. D4 on r8a7740) must be kept powered to avoid a crash during resume from s2ram (dbg_cpu_pm_notify() calls reset_ctrl_regs() unconditionally, causing an undefined instruction oops). Initialization is done from core_initcall(), as the "renesas,intc-irqpin" driver uses postcore_initcall(). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven
Simon Horman
Родитель
25717b8573
Коммит
2173fc7cb6
|
|
@ -7,6 +7,7 @@ config PM_RCAR
|
|||
|
||||
config PM_RMOBILE
|
||||
bool
|
||||
select PM_GENERIC_DOMAINS
|
||||
|
||||
config ARCH_RCAR_GEN1
|
||||
bool
|
||||
|
|
@ -23,7 +24,7 @@ config ARCH_RCAR_GEN2
|
|||
|
||||
config ARCH_RMOBILE
|
||||
bool
|
||||
select PM_RMOBILE if PM && !ARCH_SHMOBILE_MULTI
|
||||
select PM_RMOBILE if PM
|
||||
select SYS_SUPPORTS_SH_CMT
|
||||
select SYS_SUPPORTS_SH_TMU
|
||||
|
||||
|
|
|
|||
|
|
@ -3,6 +3,7 @@
|
|||
*
|
||||
* Copyright (C) 2012 Renesas Solutions Corp.
|
||||
* Copyright (C) 2012 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
|
||||
* Copyright (C) 2014 Glider bvba
|
||||
*
|
||||
* based on pm-sh7372.c
|
||||
* Copyright (C) 2011 Magnus Damm
|
||||
|
|
@ -13,10 +14,16 @@
|
|||
*/
|
||||
#include <linux/console.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/of_platform.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/pm.h>
|
||||
#include <linux/pm_clock.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
|
||||
#include "pm-rmobile.h"
|
||||
|
||||
/* SYSC */
|
||||
|
|
@ -30,8 +37,12 @@
|
|||
static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
|
||||
{
|
||||
struct rmobile_pm_domain *rmobile_pd = to_rmobile_pd(genpd);
|
||||
unsigned int mask = 1 << rmobile_pd->bit_shift;
|
||||
unsigned int mask;
|
||||
|
||||
if (rmobile_pd->bit_shift == ~0)
|
||||
return -EBUSY;
|
||||
|
||||
mask = 1 << rmobile_pd->bit_shift;
|
||||
if (rmobile_pd->suspend) {
|
||||
int ret = rmobile_pd->suspend();
|
||||
|
||||
|
|
@ -61,10 +72,14 @@ static int rmobile_pd_power_down(struct generic_pm_domain *genpd)
|
|||
static int __rmobile_pd_power_up(struct rmobile_pm_domain *rmobile_pd,
|
||||
bool do_resume)
|
||||
{
|
||||
unsigned int mask = 1 << rmobile_pd->bit_shift;
|
||||
unsigned int mask;
|
||||
unsigned int retry_count;
|
||||
int ret = 0;
|
||||
|
||||
if (rmobile_pd->bit_shift == ~0)
|
||||
return 0;
|
||||
|
||||
mask = 1 << rmobile_pd->bit_shift;
|
||||
if (__raw_readl(rmobile_pd->base + PSTR) & mask)
|
||||
goto out;
|
||||
|
||||
|
|
@ -148,6 +163,8 @@ static void rmobile_init_pm_domain(struct rmobile_pm_domain *rmobile_pd)
|
|||
__rmobile_pd_power_up(rmobile_pd, false);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_ARCH_SHMOBILE_LEGACY
|
||||
|
||||
void rmobile_init_domains(struct rmobile_pm_domain domains[], int num)
|
||||
{
|
||||
int j;
|
||||
|
|
@ -180,3 +197,199 @@ void rmobile_add_devices_to_domains(struct pm_domain_device data[],
|
|||
rmobile_add_device_to_domain_td(data[j].domain_name,
|
||||
data[j].pdev, &latencies);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_ARCH_SHMOBILE_LEGACY */
|
||||
|
||||
static int rmobile_pd_suspend_cpu(void)
|
||||
{
|
||||
/*
|
||||
* This domain contains the CPU core and therefore it should
|
||||
* only be turned off if the CPU is not in use.
|
||||
*/
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
static int rmobile_pd_suspend_console(void)
|
||||
{
|
||||
/*
|
||||
* Serial consoles make use of SCIF hardware located in this domain,
|
||||
* hence keep the power domain on if "no_console_suspend" is set.
|
||||
*/
|
||||
return console_suspend_enabled ? 0 : -EBUSY;
|
||||
}
|
||||
|
||||
static int rmobile_pd_suspend_debug(void)
|
||||
{
|
||||
/*
|
||||
* This domain contains the Coresight-ETM hardware block and
|
||||
* therefore it should only be turned off if the debug module is
|
||||
* not in use.
|
||||
*/
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
#define MAX_NUM_CPU_PDS 8
|
||||
|
||||
static unsigned int num_cpu_pds __initdata;
|
||||
static struct device_node *cpu_pds[MAX_NUM_CPU_PDS] __initdata;
|
||||
static struct device_node *console_pd __initdata;
|
||||
static struct device_node *debug_pd __initdata;
|
||||
|
||||
static void __init get_special_pds(void)
|
||||
{
|
||||
struct device_node *np, *pd;
|
||||
unsigned int i;
|
||||
|
||||
/* PM domains containing CPUs */
|
||||
for_each_node_by_type(np, "cpu") {
|
||||
pd = of_parse_phandle(np, "power-domains", 0);
|
||||
if (!pd)
|
||||
continue;
|
||||
|
||||
for (i = 0; i < num_cpu_pds; i++)
|
||||
if (pd == cpu_pds[i])
|
||||
break;
|
||||
|
||||
if (i < num_cpu_pds) {
|
||||
of_node_put(pd);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (num_cpu_pds == MAX_NUM_CPU_PDS) {
|
||||
pr_warn("Too many CPU PM domains\n");
|
||||
of_node_put(pd);
|
||||
continue;
|
||||
}
|
||||
|
||||
cpu_pds[num_cpu_pds++] = pd;
|
||||
}
|
||||
|
||||
/* PM domain containing console */
|
||||
if (of_stdout)
|
||||
console_pd = of_parse_phandle(of_stdout, "power-domains", 0);
|
||||
|
||||
/* PM domain containing Coresight-ETM */
|
||||
np = of_find_compatible_node(NULL, NULL, "arm,coresight-etm3x");
|
||||
if (np) {
|
||||
debug_pd = of_parse_phandle(np, "power-domains", 0);
|
||||
of_node_put(np);
|
||||
}
|
||||
}
|
||||
|
||||
static void __init put_special_pds(void)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < num_cpu_pds; i++)
|
||||
of_node_put(cpu_pds[i]);
|
||||
of_node_put(console_pd);
|
||||
of_node_put(debug_pd);
|
||||
}
|
||||
|
||||
static bool __init pd_contains_cpu(const struct device_node *pd)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < num_cpu_pds; i++)
|
||||
if (pd == cpu_pds[i])
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static void __init rmobile_setup_pm_domain(struct device_node *np,
|
||||
struct rmobile_pm_domain *pd)
|
||||
{
|
||||
const char *name = pd->genpd.name;
|
||||
|
||||
if (pd_contains_cpu(np)) {
|
||||
pr_debug("PM domain %s contains CPU\n", name);
|
||||
pd->gov = &pm_domain_always_on_gov;
|
||||
pd->suspend = rmobile_pd_suspend_cpu;
|
||||
} else if (np == console_pd) {
|
||||
pr_debug("PM domain %s contains serial console\n", name);
|
||||
pd->gov = &pm_domain_always_on_gov;
|
||||
pd->suspend = rmobile_pd_suspend_console;
|
||||
} else if (np == debug_pd) {
|
||||
pr_debug("PM domain %s contains Coresight-ETM\n", name);
|
||||
pd->gov = &pm_domain_always_on_gov;
|
||||
pd->suspend = rmobile_pd_suspend_debug;
|
||||
}
|
||||
|
||||
rmobile_init_pm_domain(pd);
|
||||
}
|
||||
|
||||
static int __init rmobile_add_pm_domains(void __iomem *base,
|
||||
struct device_node *parent,
|
||||
struct generic_pm_domain *genpd_parent)
|
||||
{
|
||||
struct device_node *np;
|
||||
|
||||
for_each_child_of_node(parent, np) {
|
||||
struct rmobile_pm_domain *pd;
|
||||
u32 idx = ~0;
|
||||
|
||||
if (of_property_read_u32(np, "reg", &idx)) {
|
||||
/* always-on domain */
|
||||
}
|
||||
|
||||
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
|
||||
if (!pd)
|
||||
return -ENOMEM;
|
||||
|
||||
pd->genpd.name = np->name;
|
||||
pd->base = base;
|
||||
pd->bit_shift = idx;
|
||||
|
||||
rmobile_setup_pm_domain(np, pd);
|
||||
if (genpd_parent)
|
||||
pm_genpd_add_subdomain(genpd_parent, &pd->genpd);
|
||||
of_genpd_add_provider_simple(np, &pd->genpd);
|
||||
|
||||
rmobile_add_pm_domains(base, np, &pd->genpd);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init rmobile_init_pm_domains(void)
|
||||
{
|
||||
struct device_node *np, *pmd;
|
||||
bool scanned = false;
|
||||
void __iomem *base;
|
||||
int ret = 0;
|
||||
|
||||
for_each_compatible_node(np, NULL, "renesas,sysc-rmobile") {
|
||||
base = of_iomap(np, 0);
|
||||
if (!base) {
|
||||
pr_warn("%s cannot map reg 0\n", np->full_name);
|
||||
continue;
|
||||
}
|
||||
|
||||
pmd = of_get_child_by_name(np, "pm-domains");
|
||||
if (!pmd) {
|
||||
pr_warn("%s lacks pm-domains node\n", np->full_name);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!scanned) {
|
||||
/* Find PM domains containing special blocks */
|
||||
get_special_pds();
|
||||
scanned = true;
|
||||
}
|
||||
|
||||
ret = rmobile_add_pm_domains(base, pmd, NULL);
|
||||
of_node_put(pmd);
|
||||
if (ret) {
|
||||
of_node_put(np);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
put_special_pds();
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
core_initcall(rmobile_init_pm_domains);
|
||||
|
||||
#endif /* !CONFIG_ARCH_SHMOBILE_LEGACY */
|
||||
|
|
|
|||
|
|
@ -37,7 +37,7 @@ struct pm_domain_device {
|
|||
struct platform_device *pdev;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_PM_RMOBILE
|
||||
#if defined(CONFIG_PM_RMOBILE) && defined(CONFIG_ARCH_SHMOBILE_LEGACY)
|
||||
extern void rmobile_init_domains(struct rmobile_pm_domain domains[], int num);
|
||||
extern void rmobile_add_device_to_domain_td(const char *domain_name,
|
||||
struct platform_device *pdev,
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче