250 lines
5.6 KiB
C
250 lines
5.6 KiB
C
/*
|
|
* r8a7779 Power management support
|
|
*
|
|
* Copyright (C) 2011 Renesas Solutions Corp.
|
|
* Copyright (C) 2011 Magnus Damm
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/pm.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/err.h>
|
|
#include <linux/pm_clock.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/console.h>
|
|
#include <asm/system.h>
|
|
#include <asm/io.h>
|
|
#include <mach/common.h>
|
|
#include <mach/r8a7779.h>
|
|
|
|
static void __iomem *r8a7779_sysc_base;
|
|
|
|
/* SYSC */
|
|
#define SYSCSR 0x00
|
|
#define SYSCISR 0x04
|
|
#define SYSCISCR 0x08
|
|
#define SYSCIER 0x0c
|
|
#define SYSCIMR 0x10
|
|
#define PWRSR0 0x40
|
|
#define PWRSR1 0x80
|
|
#define PWRSR2 0xc0
|
|
#define PWRSR3 0x100
|
|
#define PWRSR4 0x140
|
|
|
|
#define PWRSR_OFFS 0x00
|
|
#define PWROFFCR_OFFS 0x04
|
|
#define PWRONCR_OFFS 0x0c
|
|
#define PWRER_OFFS 0x14
|
|
|
|
#define SYSCSR_RETRIES 100
|
|
#define SYSCSR_DELAY_US 1
|
|
|
|
#define SYSCISR_RETRIES 1000
|
|
#define SYSCISR_DELAY_US 1
|
|
|
|
#if defined(CONFIG_PM) || defined(CONFIG_SMP)
|
|
|
|
static DEFINE_SPINLOCK(r8a7779_sysc_lock); /* SMP CPUs + I/O devices */
|
|
|
|
static int r8a7779_sysc_pwr_on_off(struct r8a7779_pm_ch *r8a7779_ch,
|
|
int sr_bit, int reg_offs)
|
|
{
|
|
int k;
|
|
|
|
for (k = 0; k < SYSCSR_RETRIES; k++) {
|
|
if (ioread32(r8a7779_sysc_base + SYSCSR) & (1 << sr_bit))
|
|
break;
|
|
udelay(SYSCSR_DELAY_US);
|
|
}
|
|
|
|
if (k == SYSCSR_RETRIES)
|
|
return -EAGAIN;
|
|
|
|
iowrite32(1 << r8a7779_ch->chan_bit,
|
|
r8a7779_sysc_base + r8a7779_ch->chan_offs + reg_offs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int r8a7779_sysc_pwr_off(struct r8a7779_pm_ch *r8a7779_ch)
|
|
{
|
|
return r8a7779_sysc_pwr_on_off(r8a7779_ch, 0, PWROFFCR_OFFS);
|
|
}
|
|
|
|
static int r8a7779_sysc_pwr_on(struct r8a7779_pm_ch *r8a7779_ch)
|
|
{
|
|
return r8a7779_sysc_pwr_on_off(r8a7779_ch, 1, PWRONCR_OFFS);
|
|
}
|
|
|
|
static int r8a7779_sysc_update(struct r8a7779_pm_ch *r8a7779_ch,
|
|
int (*on_off_fn)(struct r8a7779_pm_ch *))
|
|
{
|
|
unsigned int isr_mask = 1 << r8a7779_ch->isr_bit;
|
|
unsigned int chan_mask = 1 << r8a7779_ch->chan_bit;
|
|
unsigned int status;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
int k;
|
|
|
|
spin_lock_irqsave(&r8a7779_sysc_lock, flags);
|
|
|
|
iowrite32(isr_mask, r8a7779_sysc_base + SYSCISCR);
|
|
|
|
do {
|
|
ret = on_off_fn(r8a7779_ch);
|
|
if (ret)
|
|
goto out;
|
|
|
|
status = ioread32(r8a7779_sysc_base +
|
|
r8a7779_ch->chan_offs + PWRER_OFFS);
|
|
} while (status & chan_mask);
|
|
|
|
for (k = 0; k < SYSCISR_RETRIES; k++) {
|
|
if (ioread32(r8a7779_sysc_base + SYSCISR) & isr_mask)
|
|
break;
|
|
udelay(SYSCISR_DELAY_US);
|
|
}
|
|
|
|
if (k == SYSCISR_RETRIES)
|
|
ret = -EIO;
|
|
|
|
iowrite32(isr_mask, r8a7779_sysc_base + SYSCISCR);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&r8a7779_sysc_lock, flags);
|
|
|
|
pr_debug("r8a7779 power domain %d: %02x %02x %02x %02x %02x -> %d\n",
|
|
r8a7779_ch->isr_bit, ioread32(r8a7779_sysc_base + PWRSR0),
|
|
ioread32(r8a7779_sysc_base + PWRSR1),
|
|
ioread32(r8a7779_sysc_base + PWRSR2),
|
|
ioread32(r8a7779_sysc_base + PWRSR3),
|
|
ioread32(r8a7779_sysc_base + PWRSR4), ret);
|
|
return ret;
|
|
}
|
|
|
|
int r8a7779_sysc_power_down(struct r8a7779_pm_ch *r8a7779_ch)
|
|
{
|
|
return r8a7779_sysc_update(r8a7779_ch, r8a7779_sysc_pwr_off);
|
|
}
|
|
|
|
int r8a7779_sysc_power_up(struct r8a7779_pm_ch *r8a7779_ch)
|
|
{
|
|
return r8a7779_sysc_update(r8a7779_ch, r8a7779_sysc_pwr_on);
|
|
}
|
|
|
|
static void __init r8a7779_sysc_init(void)
|
|
{
|
|
r8a7779_sysc_base = ioremap_nocache(0xffd85000, PAGE_SIZE);
|
|
if (!r8a7779_sysc_base)
|
|
panic("unable to ioremap r8a7779 SYSC hardware block\n");
|
|
|
|
/* enable all interrupt sources, but do not use interrupt handler */
|
|
iowrite32(0x0131000e, r8a7779_sysc_base + SYSCIER);
|
|
iowrite32(0, r8a7779_sysc_base + SYSCIMR);
|
|
}
|
|
|
|
#else /* CONFIG_PM || CONFIG_SMP */
|
|
|
|
static inline void r8a7779_sysc_init(void) {}
|
|
|
|
#endif /* CONFIG_PM || CONFIG_SMP */
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int pd_power_down(struct generic_pm_domain *genpd)
|
|
{
|
|
return r8a7779_sysc_power_down(to_r8a7779_ch(genpd));
|
|
}
|
|
|
|
static int pd_power_up(struct generic_pm_domain *genpd)
|
|
{
|
|
return r8a7779_sysc_power_up(to_r8a7779_ch(genpd));
|
|
}
|
|
|
|
static bool pd_is_off(struct generic_pm_domain *genpd)
|
|
{
|
|
struct r8a7779_pm_ch *r8a7779_ch = to_r8a7779_ch(genpd);
|
|
unsigned int st;
|
|
|
|
st = ioread32(r8a7779_sysc_base + r8a7779_ch->chan_offs + PWRSR_OFFS);
|
|
if (st & (1 << r8a7779_ch->chan_bit))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool pd_active_wakeup(struct device *dev)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
void r8a7779_init_pm_domain(struct r8a7779_pm_domain *r8a7779_pd)
|
|
{
|
|
struct generic_pm_domain *genpd = &r8a7779_pd->genpd;
|
|
|
|
pm_genpd_init(genpd, NULL, false);
|
|
genpd->dev_ops.stop = pm_clk_suspend;
|
|
genpd->dev_ops.start = pm_clk_resume;
|
|
genpd->dev_ops.active_wakeup = pd_active_wakeup;
|
|
genpd->dev_irq_safe = true;
|
|
genpd->power_off = pd_power_down;
|
|
genpd->power_on = pd_power_up;
|
|
|
|
if (pd_is_off(&r8a7779_pd->genpd))
|
|
pd_power_up(&r8a7779_pd->genpd);
|
|
}
|
|
|
|
void r8a7779_add_device_to_domain(struct r8a7779_pm_domain *r8a7779_pd,
|
|
struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
|
|
pm_genpd_add_device(&r8a7779_pd->genpd, dev);
|
|
if (pm_clk_no_clocks(dev))
|
|
pm_clk_add(dev, NULL);
|
|
}
|
|
|
|
struct r8a7779_pm_domain r8a7779_sh4a = {
|
|
.ch = {
|
|
.chan_offs = 0x80, /* PWRSR1 .. PWRER1 */
|
|
.isr_bit = 16, /* SH4A */
|
|
}
|
|
};
|
|
|
|
struct r8a7779_pm_domain r8a7779_sgx = {
|
|
.ch = {
|
|
.chan_offs = 0xc0, /* PWRSR2 .. PWRER2 */
|
|
.isr_bit = 20, /* SGX */
|
|
}
|
|
};
|
|
|
|
struct r8a7779_pm_domain r8a7779_vdp1 = {
|
|
.ch = {
|
|
.chan_offs = 0x100, /* PWRSR3 .. PWRER3 */
|
|
.isr_bit = 21, /* VDP */
|
|
}
|
|
};
|
|
|
|
struct r8a7779_pm_domain r8a7779_impx3 = {
|
|
.ch = {
|
|
.chan_offs = 0x140, /* PWRSR4 .. PWRER4 */
|
|
.isr_bit = 24, /* IMP */
|
|
}
|
|
};
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
void __init r8a7779_pm_init(void)
|
|
{
|
|
static int once;
|
|
|
|
if (!once++)
|
|
r8a7779_sysc_init();
|
|
}
|