d459bfe01f
This patch creates an interface to the clockdomain registers in the PRM/CM modules on OMAP2/3. This interface is intended to be used by PM code, e.g., pm.c; not by device drivers directly. The patch also adds clockdomain usecount tracking. This is intended to be called whenever the first clock in a clockdomain is enabled, or when the last enabled clock in a clockdomain is disabled. If the clockdomain is in software-supervised mode, the code will force-wakeup or force-sleep the clockdomain. If the clockdomain is in hardware-supervised mode, the first clock enable will add sleep and wakeup dependencies on a user-selectable set of parent domains (usually MPU & IVA2), and the disable will remove them. Each clockdomain will be defined in later patches as static structures. The clockdomain structures are linked into a list at boot by clkdm_register(), similar to the OMAP clock code. The patch adds a Kconfig option, CONFIG_OMAP_DEBUG_CLOCKDOMAIN, which when enabled will emit verbose debug messages via pr_debug(). Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
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* linux/include/asm-arm/arch-omap/clockdomain.h
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*
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* OMAP2/3 clockdomain framework functions
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*
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* Copyright (C) 2008 Texas Instruments, Inc.
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* Copyright (C) 2008 Nokia Corporation
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*
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* Written by Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
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#define __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
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#include <mach/powerdomain.h>
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#include <mach/clock.h>
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#include <mach/cpu.h>
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/* Clockdomain capability flags */
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#define CLKDM_CAN_FORCE_SLEEP (1 << 0)
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#define CLKDM_CAN_FORCE_WAKEUP (1 << 1)
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#define CLKDM_CAN_ENABLE_AUTO (1 << 2)
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#define CLKDM_CAN_DISABLE_AUTO (1 << 3)
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#define CLKDM_CAN_HWSUP (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
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#define CLKDM_CAN_SWSUP (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
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#define CLKDM_CAN_HWSUP_SWSUP (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
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/* OMAP24XX CM_CLKSTCTRL_*.AUTOSTATE_* register bit values */
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#define OMAP24XX_CLKSTCTRL_DISABLE_AUTO 0x0
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#define OMAP24XX_CLKSTCTRL_ENABLE_AUTO 0x1
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/* OMAP3XXX CM_CLKSTCTRL_*.CLKTRCTRL_* register bit values */
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#define OMAP34XX_CLKSTCTRL_DISABLE_AUTO 0x0
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#define OMAP34XX_CLKSTCTRL_FORCE_SLEEP 0x1
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#define OMAP34XX_CLKSTCTRL_FORCE_WAKEUP 0x2
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#define OMAP34XX_CLKSTCTRL_ENABLE_AUTO 0x3
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/*
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* struct clkdm_pwrdm_autodep - a powerdomain that should have wkdeps
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* and sleepdeps added when a powerdomain should stay active in hwsup mode;
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* and conversely, removed when the powerdomain should be allowed to go
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* inactive in hwsup mode.
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*/
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struct clkdm_pwrdm_autodep {
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/* Name of the powerdomain to add a wkdep/sleepdep on */
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const char *pwrdm_name;
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/* Powerdomain pointer (looked up at clkdm_init() time) */
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struct powerdomain *pwrdm;
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/* OMAP chip types that this clockdomain dep is valid on */
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const struct omap_chip_id omap_chip;
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};
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struct clockdomain {
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/* Clockdomain name */
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const char *name;
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/* Powerdomain enclosing this clockdomain */
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const char *pwrdm_name;
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/* CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg */
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const u16 clktrctrl_mask;
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/* Clockdomain capability flags */
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const u8 flags;
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/* OMAP chip types that this clockdomain is valid on */
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const struct omap_chip_id omap_chip;
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/* Usecount tracking */
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atomic_t usecount;
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/* Powerdomain pointer assigned at clkdm_register() */
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struct powerdomain *pwrdm;
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struct list_head node;
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};
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void clkdm_init(struct clockdomain **clkdms, struct clkdm_pwrdm_autodep *autodeps);
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int clkdm_register(struct clockdomain *clkdm);
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int clkdm_unregister(struct clockdomain *clkdm);
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struct clockdomain *clkdm_lookup(const char *name);
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int clkdm_for_each(int (*fn)(struct clockdomain *clkdm));
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struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
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void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
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void omap2_clkdm_deny_idle(struct clockdomain *clkdm);
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int omap2_clkdm_wakeup(struct clockdomain *clkdm);
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int omap2_clkdm_sleep(struct clockdomain *clkdm);
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int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
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int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
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#endif
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