diff options
Diffstat (limited to 'arch/arm/mach-shmobile/pm-rcar.c')
| -rw-r--r-- | arch/arm/mach-shmobile/pm-rcar.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/arch/arm/mach-shmobile/pm-rcar.c b/arch/arm/mach-shmobile/pm-rcar.c deleted file mode 100644 index 0af05d288b09..000000000000 --- a/arch/arm/mach-shmobile/pm-rcar.c +++ /dev/null @@ -1,164 +0,0 @@ -/* - * 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 <linux/io.h> -#include "pm-rcar.h" - -/* SYSC Common */ -#define SYSCSR 0x00 /* SYSC Status Register */ -#define SYSCISR 0x04 /* Interrupt Status Register */ -#define SYSCISCR 0x08 /* Interrupt Status Clear Register */ -#define SYSCIER 0x0c /* Interrupt Enable Register */ -#define SYSCIMR 0x10 /* Interrupt Mask Register */ - -/* SYSC Status Register */ -#define SYSCSR_PONENB 1 /* Ready for power resume requests */ -#define SYSCSR_POFFENB 0 /* Ready for power shutoff requests */ - -/* - * Power Control Register Offsets inside the register block for each domain - * Note: The "CR" registers for ARM cores exist on H1 only - * Use WFI to power off, CPG/APMU to resume ARM cores on R-Car Gen2 - */ -#define PWRSR_OFFS 0x00 /* Power Status Register */ -#define PWROFFCR_OFFS 0x04 /* Power Shutoff Control Register */ -#define PWROFFSR_OFFS 0x08 /* Power Shutoff Status Register */ -#define PWRONCR_OFFS 0x0c /* Power Resume Control Register */ -#define PWRONSR_OFFS 0x10 /* Power Resume Status Register */ -#define PWRER_OFFS 0x14 /* Power Shutoff/Resume Error */ - - -#define SYSCSR_RETRIES 100 -#define SYSCSR_DELAY_US 1 - -#define PWRER_RETRIES 100 -#define PWRER_DELAY_US 1 - -#define SYSCISR_RETRIES 1000 -#define SYSCISR_DELAY_US 1 - -static void __iomem *rcar_sysc_base; -static DEFINE_SPINLOCK(rcar_sysc_lock); /* SMP CPUs + I/O devices */ - -static int rcar_sysc_pwr_on_off(const struct rcar_sysc_ch *sysc_ch, bool on) -{ - unsigned int sr_bit, reg_offs; - int k; - - if (on) { - sr_bit = SYSCSR_PONENB; - reg_offs = PWRONCR_OFFS; - } else { - sr_bit = SYSCSR_POFFENB; - reg_offs = PWROFFCR_OFFS; - } - - /* Wait until SYSC is ready to accept a power request */ - for (k = 0; k < SYSCSR_RETRIES; k++) { - if (ioread32(rcar_sysc_base + SYSCSR) & BIT(sr_bit)) - break; - udelay(SYSCSR_DELAY_US); - } - - if (k == SYSCSR_RETRIES) - return -EAGAIN; - - /* Submit power shutoff or power resume request */ - iowrite32(BIT(sysc_ch->chan_bit), - rcar_sysc_base + sysc_ch->chan_offs + reg_offs); - - return 0; -} - -static int rcar_sysc_power(const struct rcar_sysc_ch *sysc_ch, bool on) -{ - unsigned int isr_mask = BIT(sysc_ch->isr_bit); - unsigned int chan_mask = BIT(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); - - /* Submit power shutoff or resume request until it was accepted */ - for (k = 0; k < PWRER_RETRIES; k++) { - ret = rcar_sysc_pwr_on_off(sysc_ch, on); - if (ret) - goto out; - - status = ioread32(rcar_sysc_base + - sysc_ch->chan_offs + PWRER_OFFS); - if (!(status & chan_mask)) - break; - - udelay(PWRER_DELAY_US); - } - - if (k == PWRER_RETRIES) { - ret = -EIO; - goto out; - } - - /* Wait until the power shutoff or resume request has completed * */ - 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(const struct rcar_sysc_ch *sysc_ch) -{ - return rcar_sysc_power(sysc_ch, false); -} - -int rcar_sysc_power_up(const struct rcar_sysc_ch *sysc_ch) -{ - return rcar_sysc_power(sysc_ch, true); -} - -bool rcar_sysc_power_is_off(const struct rcar_sysc_ch *sysc_ch) -{ - unsigned int st; - - st = ioread32(rcar_sysc_base + sysc_ch->chan_offs + PWRSR_OFFS); - if (st & BIT(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; -} |