541 lines
14 KiB
C
541 lines
14 KiB
C
/*
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* sh7372 Power management support
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*
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* Copyright (C) 2011 Magnus Damm
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/pm.h>
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#include <linux/suspend.h>
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#include <linux/cpuidle.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/pm_clock.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/bitrev.h>
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#include <linux/console.h>
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#include <asm/cpuidle.h>
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#include <asm/io.h>
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#include <asm/tlbflush.h>
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#include <asm/suspend.h>
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#include <mach/common.h>
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#include <mach/sh7372.h>
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#include <mach/pm-rmobile.h>
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/* DBG */
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#define DBGREG1 IOMEM(0xe6100020)
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#define DBGREG9 IOMEM(0xe6100040)
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/* CPGA */
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#define SYSTBCR IOMEM(0xe6150024)
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#define MSTPSR0 IOMEM(0xe6150030)
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#define MSTPSR1 IOMEM(0xe6150038)
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#define MSTPSR2 IOMEM(0xe6150040)
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#define MSTPSR3 IOMEM(0xe6150048)
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#define MSTPSR4 IOMEM(0xe615004c)
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#define PLLC01STPCR IOMEM(0xe61500c8)
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/* SYSC */
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#define SBAR IOMEM(0xe6180020)
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#define WUPRMSK IOMEM(0xe6180028)
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#define WUPSMSK IOMEM(0xe618002c)
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#define WUPSMSK2 IOMEM(0xe6180048)
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#define WUPSFAC IOMEM(0xe6180098)
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#define IRQCR IOMEM(0xe618022c)
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#define IRQCR2 IOMEM(0xe6180238)
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#define IRQCR3 IOMEM(0xe6180244)
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#define IRQCR4 IOMEM(0xe6180248)
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#define PDNSEL IOMEM(0xe6180254)
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/* INTC */
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#define ICR1A IOMEM(0xe6900000)
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#define ICR2A IOMEM(0xe6900004)
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#define ICR3A IOMEM(0xe6900008)
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#define ICR4A IOMEM(0xe690000c)
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#define INTMSK00A IOMEM(0xe6900040)
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#define INTMSK10A IOMEM(0xe6900044)
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#define INTMSK20A IOMEM(0xe6900048)
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#define INTMSK30A IOMEM(0xe690004c)
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/* MFIS */
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/* FIXME: pointing where? */
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#define SMFRAM 0xe6a70000
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/* AP-System Core */
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#define APARMBAREA IOMEM(0xe6f10020)
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#ifdef CONFIG_PM
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#define PM_DOMAIN_ON_OFF_LATENCY_NS 250000
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static int sh7372_a4r_pd_suspend(void)
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{
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sh7372_intcs_suspend();
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__raw_writel(0x300fffff, WUPRMSK); /* avoid wakeup */
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return 0;
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}
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static bool a4s_suspend_ready;
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static int sh7372_a4s_pd_suspend(void)
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{
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/*
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* The A4S domain contains the CPU core and therefore it should
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* only be turned off if the CPU is not in use. This may happen
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* during system suspend, when SYSC is going to be used for generating
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* resume signals and a4s_suspend_ready is set to let
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* sh7372_enter_suspend() know that it can turn A4S off.
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*/
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a4s_suspend_ready = true;
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return -EBUSY;
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}
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static void sh7372_a4s_pd_resume(void)
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{
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a4s_suspend_ready = false;
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}
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static int sh7372_a3sp_pd_suspend(void)
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{
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/*
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* Serial consoles make use of SCIF hardware located in A3SP,
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* keep such power domain on if "no_console_suspend" is set.
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*/
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return console_suspend_enabled ? 0 : -EBUSY;
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}
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static struct rmobile_pm_domain sh7372_pm_domains[] = {
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{
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.genpd.name = "A4LC",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 1,
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},
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{
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.genpd.name = "A4MP",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 2,
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},
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{
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.genpd.name = "D4",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 3,
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},
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{
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.genpd.name = "A4R",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 5,
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.suspend = sh7372_a4r_pd_suspend,
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.resume = sh7372_intcs_resume,
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},
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{
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.genpd.name = "A3RV",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 6,
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},
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{
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.genpd.name = "A3RI",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 8,
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},
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{
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.genpd.name = "A4S",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 10,
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.gov = &pm_domain_always_on_gov,
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.no_debug = true,
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.suspend = sh7372_a4s_pd_suspend,
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.resume = sh7372_a4s_pd_resume,
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},
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{
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.genpd.name = "A3SP",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 11,
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.gov = &pm_domain_always_on_gov,
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.no_debug = true,
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.suspend = sh7372_a3sp_pd_suspend,
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},
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{
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.genpd.name = "A3SG",
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.genpd.power_on_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.genpd.power_off_latency_ns = PM_DOMAIN_ON_OFF_LATENCY_NS,
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.bit_shift = 13,
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},
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};
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void __init sh7372_init_pm_domains(void)
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{
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rmobile_init_domains(sh7372_pm_domains, ARRAY_SIZE(sh7372_pm_domains));
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pm_genpd_add_subdomain_names("A4LC", "A3RV");
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pm_genpd_add_subdomain_names("A4R", "A4LC");
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pm_genpd_add_subdomain_names("A4S", "A3SG");
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pm_genpd_add_subdomain_names("A4S", "A3SP");
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}
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#endif /* CONFIG_PM */
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#if defined(CONFIG_SUSPEND) || defined(CONFIG_CPU_IDLE)
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static void sh7372_set_reset_vector(unsigned long address)
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{
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/* set reset vector, translate 4k */
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__raw_writel(address, SBAR);
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__raw_writel(0, APARMBAREA);
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}
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static void sh7372_enter_sysc(int pllc0_on, unsigned long sleep_mode)
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{
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if (pllc0_on)
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__raw_writel(0, PLLC01STPCR);
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else
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__raw_writel(1 << 28, PLLC01STPCR);
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__raw_readl(WUPSFAC); /* read wakeup int. factor before sleep */
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cpu_suspend(sleep_mode, sh7372_do_idle_sysc);
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__raw_readl(WUPSFAC); /* read wakeup int. factor after wakeup */
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/* disable reset vector translation */
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__raw_writel(0, SBAR);
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}
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static int sh7372_sysc_valid(unsigned long *mskp, unsigned long *msk2p)
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{
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unsigned long mstpsr0, mstpsr1, mstpsr2, mstpsr3, mstpsr4;
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unsigned long msk, msk2;
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/* check active clocks to determine potential wakeup sources */
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mstpsr0 = __raw_readl(MSTPSR0);
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if ((mstpsr0 & 0x00000003) != 0x00000003) {
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pr_debug("sh7372 mstpsr0 0x%08lx\n", mstpsr0);
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return 0;
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}
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mstpsr1 = __raw_readl(MSTPSR1);
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if ((mstpsr1 & 0xff079b7f) != 0xff079b7f) {
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pr_debug("sh7372 mstpsr1 0x%08lx\n", mstpsr1);
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return 0;
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}
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mstpsr2 = __raw_readl(MSTPSR2);
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if ((mstpsr2 & 0x000741ff) != 0x000741ff) {
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pr_debug("sh7372 mstpsr2 0x%08lx\n", mstpsr2);
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return 0;
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}
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mstpsr3 = __raw_readl(MSTPSR3);
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if ((mstpsr3 & 0x1a60f010) != 0x1a60f010) {
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pr_debug("sh7372 mstpsr3 0x%08lx\n", mstpsr3);
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return 0;
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}
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mstpsr4 = __raw_readl(MSTPSR4);
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if ((mstpsr4 & 0x00008cf0) != 0x00008cf0) {
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pr_debug("sh7372 mstpsr4 0x%08lx\n", mstpsr4);
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return 0;
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}
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msk = 0;
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msk2 = 0;
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/* make bitmaps of limited number of wakeup sources */
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if ((mstpsr2 & (1 << 23)) == 0) /* SPU2 */
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msk |= 1 << 31;
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if ((mstpsr2 & (1 << 12)) == 0) /* MFI_MFIM */
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msk |= 1 << 21;
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if ((mstpsr4 & (1 << 3)) == 0) /* KEYSC */
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msk |= 1 << 2;
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if ((mstpsr1 & (1 << 24)) == 0) /* CMT0 */
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msk |= 1 << 1;
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if ((mstpsr3 & (1 << 29)) == 0) /* CMT1 */
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msk |= 1 << 1;
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if ((mstpsr4 & (1 << 0)) == 0) /* CMT2 */
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msk |= 1 << 1;
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if ((mstpsr2 & (1 << 13)) == 0) /* MFI_MFIS */
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msk2 |= 1 << 17;
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*mskp = msk;
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*msk2p = msk2;
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return 1;
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}
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static void sh7372_icr_to_irqcr(unsigned long icr, u16 *irqcr1p, u16 *irqcr2p)
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{
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u16 tmp, irqcr1, irqcr2;
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int k;
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irqcr1 = 0;
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irqcr2 = 0;
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/* convert INTCA ICR register layout to SYSC IRQCR+IRQCR2 */
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for (k = 0; k <= 7; k++) {
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tmp = (icr >> ((7 - k) * 4)) & 0xf;
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irqcr1 |= (tmp & 0x03) << (k * 2);
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irqcr2 |= (tmp >> 2) << (k * 2);
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}
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*irqcr1p = irqcr1;
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*irqcr2p = irqcr2;
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}
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static void sh7372_setup_sysc(unsigned long msk, unsigned long msk2)
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{
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u16 irqcrx_low, irqcrx_high, irqcry_low, irqcry_high;
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unsigned long tmp;
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/* read IRQ0A -> IRQ15A mask */
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tmp = bitrev8(__raw_readb(INTMSK00A));
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tmp |= bitrev8(__raw_readb(INTMSK10A)) << 8;
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/* setup WUPSMSK from clocks and external IRQ mask */
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msk = (~msk & 0xc030000f) | (tmp << 4);
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__raw_writel(msk, WUPSMSK);
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/* propage level/edge trigger for external IRQ 0->15 */
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sh7372_icr_to_irqcr(__raw_readl(ICR1A), &irqcrx_low, &irqcry_low);
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sh7372_icr_to_irqcr(__raw_readl(ICR2A), &irqcrx_high, &irqcry_high);
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__raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR);
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__raw_writel((irqcry_high << 16) | irqcry_low, IRQCR2);
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/* read IRQ16A -> IRQ31A mask */
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tmp = bitrev8(__raw_readb(INTMSK20A));
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tmp |= bitrev8(__raw_readb(INTMSK30A)) << 8;
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/* setup WUPSMSK2 from clocks and external IRQ mask */
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msk2 = (~msk2 & 0x00030000) | tmp;
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__raw_writel(msk2, WUPSMSK2);
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/* propage level/edge trigger for external IRQ 16->31 */
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sh7372_icr_to_irqcr(__raw_readl(ICR3A), &irqcrx_low, &irqcry_low);
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sh7372_icr_to_irqcr(__raw_readl(ICR4A), &irqcrx_high, &irqcry_high);
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__raw_writel((irqcrx_high << 16) | irqcrx_low, IRQCR3);
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__raw_writel((irqcry_high << 16) | irqcry_low, IRQCR4);
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}
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static void sh7372_enter_a3sm_common(int pllc0_on)
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{
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/* use INTCA together with SYSC for wakeup */
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sh7372_setup_sysc(1 << 0, 0);
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sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
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sh7372_enter_sysc(pllc0_on, 1 << 12);
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}
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static void sh7372_enter_a4s_common(int pllc0_on)
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{
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sh7372_intca_suspend();
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sh7372_set_reset_vector(SMFRAM);
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sh7372_enter_sysc(pllc0_on, 1 << 10);
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sh7372_intca_resume();
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}
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static void sh7372_pm_setup_smfram(void)
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{
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/* pass physical address of cpu_resume() to assembly resume code */
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sh7372_cpu_resume = virt_to_phys(cpu_resume);
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memcpy((void *)SMFRAM, sh7372_resume_core_standby_sysc, 0x100);
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}
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#else
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static inline void sh7372_pm_setup_smfram(void) {}
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#endif /* CONFIG_SUSPEND || CONFIG_CPU_IDLE */
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#ifdef CONFIG_CPU_IDLE
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static int sh7372_do_idle_core_standby(unsigned long unused)
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{
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cpu_do_idle(); /* WFI when SYSTBCR == 0x10 -> Core Standby */
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return 0;
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}
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static int sh7372_enter_core_standby(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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sh7372_set_reset_vector(__pa(sh7372_resume_core_standby_sysc));
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/* enter sleep mode with SYSTBCR to 0x10 */
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__raw_writel(0x10, SYSTBCR);
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cpu_suspend(0, sh7372_do_idle_core_standby);
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__raw_writel(0, SYSTBCR);
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/* disable reset vector translation */
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__raw_writel(0, SBAR);
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return 1;
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}
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static int sh7372_enter_a3sm_pll_on(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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sh7372_enter_a3sm_common(1);
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return 2;
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}
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static int sh7372_enter_a3sm_pll_off(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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sh7372_enter_a3sm_common(0);
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return 3;
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}
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static int sh7372_enter_a4s(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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unsigned long msk, msk2;
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if (!sh7372_sysc_valid(&msk, &msk2))
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return sh7372_enter_a3sm_pll_off(dev, drv, index);
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sh7372_setup_sysc(msk, msk2);
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sh7372_enter_a4s_common(0);
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return 4;
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}
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static struct cpuidle_driver sh7372_cpuidle_driver = {
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.name = "sh7372_cpuidle",
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.owner = THIS_MODULE,
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.state_count = 5,
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.safe_state_index = 0, /* C1 */
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.states[0] = ARM_CPUIDLE_WFI_STATE,
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.states[1] = {
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.name = "C2",
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.desc = "Core Standby Mode",
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.exit_latency = 10,
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.target_residency = 20 + 10,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.enter = sh7372_enter_core_standby,
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},
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.states[2] = {
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.name = "C3",
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.desc = "A3SM PLL ON",
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.exit_latency = 20,
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.target_residency = 30 + 20,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.enter = sh7372_enter_a3sm_pll_on,
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},
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.states[3] = {
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.name = "C4",
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.desc = "A3SM PLL OFF",
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.exit_latency = 120,
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.target_residency = 30 + 120,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.enter = sh7372_enter_a3sm_pll_off,
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},
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.states[4] = {
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.name = "C5",
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.desc = "A4S PLL OFF",
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.exit_latency = 240,
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.target_residency = 30 + 240,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.enter = sh7372_enter_a4s,
|
|
.disabled = true,
|
|
},
|
|
};
|
|
|
|
static void __init sh7372_cpuidle_init(void)
|
|
{
|
|
shmobile_cpuidle_set_driver(&sh7372_cpuidle_driver);
|
|
}
|
|
#else
|
|
static void __init sh7372_cpuidle_init(void) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
static int sh7372_enter_suspend(suspend_state_t suspend_state)
|
|
{
|
|
unsigned long msk, msk2;
|
|
|
|
/* check active clocks to determine potential wakeup sources */
|
|
if (sh7372_sysc_valid(&msk, &msk2) && a4s_suspend_ready) {
|
|
/* convert INTC mask/sense to SYSC mask/sense */
|
|
sh7372_setup_sysc(msk, msk2);
|
|
|
|
/* enter A4S sleep with PLLC0 off */
|
|
pr_debug("entering A4S\n");
|
|
sh7372_enter_a4s_common(0);
|
|
return 0;
|
|
}
|
|
|
|
/* default to enter A3SM sleep with PLLC0 off */
|
|
pr_debug("entering A3SM\n");
|
|
sh7372_enter_a3sm_common(0);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sh7372_pm_notifier_fn - SH7372 PM notifier routine.
|
|
* @notifier: Unused.
|
|
* @pm_event: Event being handled.
|
|
* @unused: Unused.
|
|
*/
|
|
static int sh7372_pm_notifier_fn(struct notifier_block *notifier,
|
|
unsigned long pm_event, void *unused)
|
|
{
|
|
switch (pm_event) {
|
|
case PM_SUSPEND_PREPARE:
|
|
/*
|
|
* This is necessary, because the A4R domain has to be "on"
|
|
* when suspend_device_irqs() and resume_device_irqs() are
|
|
* executed during system suspend and resume, respectively, so
|
|
* that those functions don't crash while accessing the INTCS.
|
|
*/
|
|
pm_genpd_name_poweron("A4R");
|
|
break;
|
|
case PM_POST_SUSPEND:
|
|
pm_genpd_poweroff_unused();
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static void sh7372_suspend_init(void)
|
|
{
|
|
shmobile_suspend_ops.enter = sh7372_enter_suspend;
|
|
pm_notifier(sh7372_pm_notifier_fn, 0);
|
|
}
|
|
#else
|
|
static void sh7372_suspend_init(void) {}
|
|
#endif
|
|
|
|
void __init sh7372_pm_init(void)
|
|
{
|
|
/* enable DBG hardware block to kick SYSC */
|
|
__raw_writel(0x0000a500, DBGREG9);
|
|
__raw_writel(0x0000a501, DBGREG9);
|
|
__raw_writel(0x00000000, DBGREG1);
|
|
|
|
/* do not convert A3SM, A3SP, A3SG, A4R power down into A4S */
|
|
__raw_writel(0, PDNSEL);
|
|
|
|
sh7372_pm_setup_smfram();
|
|
|
|
sh7372_suspend_init();
|
|
sh7372_cpuidle_init();
|
|
}
|
|
|
|
void __init sh7372_pm_init_late(void)
|
|
{
|
|
shmobile_init_late();
|
|
pm_genpd_name_attach_cpuidle("A4S", 4);
|
|
}
|