diff options
Diffstat (limited to 'arch/arm/mach-shmobile/pm-r8a7779.c')
| -rw-r--r-- | arch/arm/mach-shmobile/pm-r8a7779.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/pm-r8a7779.c b/arch/arm/mach-shmobile/pm-r8a7779.c new file mode 100644 index 000000000000..c38ba7b43ef8 --- /dev/null +++ b/arch/arm/mach-shmobile/pm-r8a7779.c @@ -0,0 +1,249 @@ +/* + * 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(); +} |