From: Paul Walmsley Date: Tue, 14 Dec 2010 19:42:35 +0000 (-0700) Subject: OMAP2+: hwmod: add postsetup state X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2092e5ccf89db09ebde94e9aabd3c86d5fa05c6c;p=linux-beck.git OMAP2+: hwmod: add postsetup state Allow board files and OMAP core code to control the state that some or all of the hwmods end up in at the end of _setup() (called by omap_hwmod_late_init() ). Reimplement the old skip_setup_idle code in terms of this new postsetup state code. There are two use-cases for this patch: the !CONFIG_PM_RUNTIME case, in which all IP blocks should stay enabled after _setup() finishes; and the MPU watchdog case, in which the watchdog IP block should enter idle if watchdog coverage of kernel initialization is desired, and should be disabled otherwise. Signed-off-by: Paul Walmsley Cc: Benoît Cousson Cc: Kevin Hilman Cc: Charulatha Varadarajan --- diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c index 77bf0d1baeef..7362b69a154d 100644 --- a/arch/arm/mach-omap2/io.c +++ b/arch/arm/mach-omap2/io.c @@ -312,6 +312,11 @@ static int __init _omap2_init_reprogram_sdrc(void) return v; } +static int _set_hwmod_postsetup_state(struct omap_hwmod *oh, void *data) +{ + return omap_hwmod_set_postsetup_state(oh, *(u8 *)data); +} + /* * Initialize asm_irq_base for entry-macro.S */ @@ -333,6 +338,8 @@ static inline void omap_irq_base_init(void) void __init omap2_init_common_infrastructure(void) { + u8 postsetup_state; + pwrdm_init(powerdomains_omap); clkdm_init(clockdomains_omap, clkdm_autodeps); if (cpu_is_omap242x()) @@ -343,6 +350,16 @@ void __init omap2_init_common_infrastructure(void) omap3xxx_hwmod_init(); else if (cpu_is_omap44xx()) omap44xx_hwmod_init(); + else + pr_err("Could not init hwmod data - unknown SoC\n"); + + /* Set the default postsetup state for all hwmods */ +#ifdef CONFIG_PM_RUNTIME + postsetup_state = _HWMOD_STATE_IDLE; +#else + postsetup_state = _HWMOD_STATE_ENABLED; +#endif + omap_hwmod_for_each(_set_hwmod_postsetup_state, &postsetup_state); omap_pm_if_early_init(); @@ -355,25 +372,16 @@ void __init omap2_init_common_infrastructure(void) else if (cpu_is_omap44xx()) omap4xxx_clk_init(); else - pr_err("Could not init clock framework - unknown CPU\n"); + pr_err("Could not init clock framework - unknown SoC\n"); } -/* - * XXX Ideally, this function will dwindle into nothingness over time; - * almost all device init code should be possible through initcalls - * and other generalized mechanisms - */ void __init omap2_init_common_devices(struct omap_sdrc_params *sdrc_cs0, struct omap_sdrc_params *sdrc_cs1) { - u8 skip_setup_idle = 0; - omap_serial_early_init(); -#ifndef CONFIG_PM_RUNTIME - skip_setup_idle = 1; -#endif - omap_hwmod_late_init(skip_setup_idle); + omap_hwmod_late_init(); + if (cpu_is_omap24xx() || cpu_is_omap34xx()) { omap2_sdrc_init(sdrc_cs0, sdrc_cs1); _omap2_init_reprogram_sdrc(); diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index c051fa493594..683428fa91f4 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -1313,23 +1313,15 @@ static int _shutdown(struct omap_hwmod *oh) /** * _setup - do initial configuration of omap_hwmod * @oh: struct omap_hwmod * - * @skip_setup_idle_p: do not idle hwmods at the end of the fn if 1 * * Writes the CLOCKACTIVITY bits @clockact to the hwmod @oh - * OCP_SYSCONFIG register. @skip_setup_idle is intended to be used on - * a system that will not call omap_hwmod_enable() to enable devices - * (e.g., a system without PM runtime). Returns -EINVAL if the hwmod - * is in the wrong state or returns 0. + * OCP_SYSCONFIG register. Returns -EINVAL if the hwmod is in the + * wrong state or returns 0. */ static int _setup(struct omap_hwmod *oh, void *data) { int i, r; - u8 skip_setup_idle; - - if (!oh || !data) - return -EINVAL; - - skip_setup_idle = *(u8 *)data; + u8 postsetup_state; /* Set iclk autoidle mode */ if (oh->slaves_cnt > 0) { @@ -1349,7 +1341,6 @@ static int _setup(struct omap_hwmod *oh, void *data) } } - mutex_init(&oh->_mutex); oh->_state = _HWMOD_STATE_INITIALIZED; /* @@ -1383,8 +1374,25 @@ static int _setup(struct omap_hwmod *oh, void *data) } } - if (!(oh->flags & HWMOD_INIT_NO_IDLE) && !skip_setup_idle) + postsetup_state = oh->_postsetup_state; + if (postsetup_state == _HWMOD_STATE_UNKNOWN) + postsetup_state = _HWMOD_STATE_ENABLED; + + /* + * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data - + * it should be set by the core code as a runtime flag during startup + */ + if ((oh->flags & HWMOD_INIT_NO_IDLE) && + (postsetup_state == _HWMOD_STATE_IDLE)) + postsetup_state = _HWMOD_STATE_ENABLED; + + if (postsetup_state == _HWMOD_STATE_IDLE) _omap_hwmod_idle(oh); + else if (postsetup_state == _HWMOD_STATE_DISABLED) + _shutdown(oh); + else if (postsetup_state != _HWMOD_STATE_ENABLED) + WARN(1, "hwmod: %s: unknown postsetup state %d! defaulting to enabled\n", + oh->name, postsetup_state); return 0; } @@ -1485,6 +1493,8 @@ int omap_hwmod_register(struct omap_hwmod *oh) list_add_tail(&oh->node, &omap_hwmod_list); + mutex_init(&oh->_mutex); + oh->_state = _HWMOD_STATE_REGISTERED; ret = 0; @@ -1585,13 +1595,12 @@ int omap_hwmod_init(struct omap_hwmod **ohs) /** * omap_hwmod_late_init - do some post-clock framework initialization - * @skip_setup_idle: if 1, do not idle hwmods in _setup() * * Must be called after omap2_clk_init(). Resolves the struct clk names * to struct clk pointers for each registered omap_hwmod. Also calls * _setup() on each hwmod. Returns 0. */ -int omap_hwmod_late_init(u8 skip_setup_idle) +int omap_hwmod_late_init(void) { int r; @@ -1603,10 +1612,7 @@ int omap_hwmod_late_init(u8 skip_setup_idle) WARN(!mpu_oh, "omap_hwmod: could not find MPU initiator hwmod %s\n", MPU_INITIATOR_NAME); - if (skip_setup_idle) - pr_debug("omap_hwmod: will leave hwmods enabled during setup\n"); - - omap_hwmod_for_each(_setup, &skip_setup_idle); + omap_hwmod_for_each(_setup, NULL); return 0; } @@ -2132,3 +2138,41 @@ int omap_hwmod_for_each_by_class(const char *classname, return ret; } +/** + * omap_hwmod_set_postsetup_state - set the post-_setup() state for this hwmod + * @oh: struct omap_hwmod * + * @state: state that _setup() should leave the hwmod in + * + * Sets the hwmod state that @oh will enter at the end of _setup() (called by + * omap_hwmod_late_init()). Only valid to call between calls to + * omap_hwmod_init() and omap_hwmod_late_init(). Returns 0 upon success or + * -EINVAL if there is a problem with the arguments or if the hwmod is + * in the wrong state. + */ +int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state) +{ + int ret; + + if (!oh) + return -EINVAL; + + if (state != _HWMOD_STATE_DISABLED && + state != _HWMOD_STATE_ENABLED && + state != _HWMOD_STATE_IDLE) + return -EINVAL; + + mutex_lock(&oh->_mutex); + + if (oh->_state != _HWMOD_STATE_REGISTERED) { + ret = -EINVAL; + goto ohsps_unlock; + } + + oh->_postsetup_state = state; + ret = 0; + +ohsps_unlock: + mutex_unlock(&oh->_mutex); + + return ret; +} diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h index d1f1265fc4a6..b445ecdb95b8 100644 --- a/arch/arm/plat-omap/include/plat/omap_hwmod.h +++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h @@ -462,6 +462,7 @@ struct omap_hwmod_class { * @response_lat: device OCP response latency (in interface clock cycles) * @_int_flags: internal-use hwmod flags * @_state: internal-use hwmod state + * @_postsetup_state: internal-use state to leave the hwmod in after _setup() * @flags: hwmod flags (documented below) * @omap_chip: OMAP chips this hwmod is present on * @_mutex: mutex serializing operations on this hwmod @@ -510,6 +511,7 @@ struct omap_hwmod { u8 hwmods_cnt; u8 _int_flags; u8 _state; + u8 _postsetup_state; const struct omap_chip_id omap_chip; }; @@ -519,7 +521,7 @@ int omap_hwmod_unregister(struct omap_hwmod *oh); struct omap_hwmod *omap_hwmod_lookup(const char *name); int omap_hwmod_for_each(int (*fn)(struct omap_hwmod *oh, void *data), void *data); -int omap_hwmod_late_init(u8 skip_setup_idle); +int omap_hwmod_late_init(void); int omap_hwmod_enable(struct omap_hwmod *oh); int _omap_hwmod_enable(struct omap_hwmod *oh); @@ -566,6 +568,8 @@ int omap_hwmod_for_each_by_class(const char *classname, void *user), void *user); +int omap_hwmod_set_postsetup_state(struct omap_hwmod *oh, u8 state); + /* * Chip variant-specific hwmod init routines - XXX should be converted * to use initcalls once the initial boot ordering is straightened out