mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 04:45:12 +07:00
c4ca5d80e0
Move the rcar_sysc_base variable to inside #ifdefs to avoid triggering build warnings in case PM or SMP is not selected. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/*
|
|
* R-Car SYSC Power management support
|
|
*
|
|
* Copyright (C) 2014 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/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/io.h>
|
|
#include <mach/pm-rcar.h>
|
|
|
|
/* SYSC */
|
|
#define SYSCSR 0x00
|
|
#define SYSCISR 0x04
|
|
#define SYSCISCR 0x08
|
|
|
|
#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 void __iomem *rcar_sysc_base;
|
|
static DEFINE_SPINLOCK(rcar_sysc_lock); /* SMP CPUs + I/O devices */
|
|
|
|
static int rcar_sysc_pwr_on_off(struct rcar_sysc_ch *sysc_ch,
|
|
int sr_bit, int reg_offs)
|
|
{
|
|
int k;
|
|
|
|
for (k = 0; k < SYSCSR_RETRIES; k++) {
|
|
if (ioread32(rcar_sysc_base + SYSCSR) & (1 << sr_bit))
|
|
break;
|
|
udelay(SYSCSR_DELAY_US);
|
|
}
|
|
|
|
if (k == SYSCSR_RETRIES)
|
|
return -EAGAIN;
|
|
|
|
iowrite32(1 << sysc_ch->chan_bit,
|
|
rcar_sysc_base + sysc_ch->chan_offs + reg_offs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_sysc_pwr_off(struct rcar_sysc_ch *sysc_ch)
|
|
{
|
|
return rcar_sysc_pwr_on_off(sysc_ch, 0, PWROFFCR_OFFS);
|
|
}
|
|
|
|
static int rcar_sysc_pwr_on(struct rcar_sysc_ch *sysc_ch)
|
|
{
|
|
return rcar_sysc_pwr_on_off(sysc_ch, 1, PWRONCR_OFFS);
|
|
}
|
|
|
|
static int rcar_sysc_update(struct rcar_sysc_ch *sysc_ch,
|
|
int (*on_off_fn)(struct rcar_sysc_ch *))
|
|
{
|
|
unsigned int isr_mask = 1 << sysc_ch->isr_bit;
|
|
unsigned int chan_mask = 1 << sysc_ch->chan_bit;
|
|
unsigned int status;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
int k;
|
|
|
|
spin_lock_irqsave(&rcar_sysc_lock, flags);
|
|
|
|
iowrite32(isr_mask, rcar_sysc_base + SYSCISCR);
|
|
|
|
do {
|
|
ret = on_off_fn(sysc_ch);
|
|
if (ret)
|
|
goto out;
|
|
|
|
status = ioread32(rcar_sysc_base +
|
|
sysc_ch->chan_offs + PWRER_OFFS);
|
|
} while (status & chan_mask);
|
|
|
|
for (k = 0; k < SYSCISR_RETRIES; k++) {
|
|
if (ioread32(rcar_sysc_base + SYSCISR) & isr_mask)
|
|
break;
|
|
udelay(SYSCISR_DELAY_US);
|
|
}
|
|
|
|
if (k == SYSCISR_RETRIES)
|
|
ret = -EIO;
|
|
|
|
iowrite32(isr_mask, rcar_sysc_base + SYSCISCR);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&rcar_sysc_lock, flags);
|
|
|
|
pr_debug("sysc power domain %d: %08x -> %d\n",
|
|
sysc_ch->isr_bit, ioread32(rcar_sysc_base + SYSCISR), ret);
|
|
return ret;
|
|
}
|
|
|
|
int rcar_sysc_power_down(struct rcar_sysc_ch *sysc_ch)
|
|
{
|
|
return rcar_sysc_update(sysc_ch, rcar_sysc_pwr_off);
|
|
}
|
|
|
|
int rcar_sysc_power_up(struct rcar_sysc_ch *sysc_ch)
|
|
{
|
|
return rcar_sysc_update(sysc_ch, rcar_sysc_pwr_on);
|
|
}
|
|
|
|
bool rcar_sysc_power_is_off(struct rcar_sysc_ch *sysc_ch)
|
|
{
|
|
unsigned int st;
|
|
|
|
st = ioread32(rcar_sysc_base + sysc_ch->chan_offs + PWRSR_OFFS);
|
|
if (st & (1 << sysc_ch->chan_bit))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void __iomem *rcar_sysc_init(phys_addr_t base)
|
|
{
|
|
rcar_sysc_base = ioremap_nocache(base, PAGE_SIZE);
|
|
if (!rcar_sysc_base)
|
|
panic("unable to ioremap R-Car SYSC hardware block\n");
|
|
|
|
return rcar_sysc_base;
|
|
}
|
|
|
|
#endif /* CONFIG_PM || CONFIG_SMP */
|