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authorPaul Walmsley <paul@pwsan.com>2008-08-19 11:08:43 +0300
committerTony Lindgren <tony@atomide.com>2008-08-19 11:08:43 +0300
commitd459bfe01f523983a822de8c2d3fe0bd2f2c194e (patch)
tree9f583480f3c0940778bb0f7b4fee5c68eb5b5bfc /arch/arm/plat-omap
parentecb24aa129c6d4b2152571f856320aa7dea41676 (diff)
ARM: OMAP2: Clockdomain: Add base OMAP2/3 clockdomain code
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>
Diffstat (limited to 'arch/arm/plat-omap')
-rw-r--r--arch/arm/plat-omap/Kconfig12
-rw-r--r--arch/arm/plat-omap/include/mach/clockdomain.h106
2 files changed, 118 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
index e815fa35f7f..ef62bf21e17 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -41,6 +41,18 @@ config OMAP_DEBUG_POWERDOMAIN
for every powerdomain register write. However, the
extra detail costs some memory.
+config OMAP_DEBUG_CLOCKDOMAIN
+ bool "Emit debug messages from clockdomain layer"
+ depends on ARCH_OMAP2 || ARCH_OMAP3
+ default n
+ help
+ Say Y here if you want to compile in clockdomain layer
+ debugging messages for OMAP2/3. These messages can
+ provide more detail as to why some clockdomain calls
+ may be failing, and will also emit a descriptive message
+ for every clockdomain register write. However, the
+ extra detail costs some memory.
+
config OMAP_RESET_CLOCKS
bool "Reset unused clocks during boot"
depends on ARCH_OMAP
diff --git a/arch/arm/plat-omap/include/mach/clockdomain.h b/arch/arm/plat-omap/include/mach/clockdomain.h
new file mode 100644
index 00000000000..1f51f017378
--- /dev/null
+++ b/arch/arm/plat-omap/include/mach/clockdomain.h
@@ -0,0 +1,106 @@
+/*
+ * linux/include/asm-arm/arch-omap/clockdomain.h
+ *
+ * OMAP2/3 clockdomain framework functions
+ *
+ * Copyright (C) 2008 Texas Instruments, Inc.
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Written by Paul Walmsley
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
+#define __ASM_ARM_ARCH_OMAP_CLOCKDOMAIN_H
+
+#include <mach/powerdomain.h>
+#include <mach/clock.h>
+#include <mach/cpu.h>
+
+/* Clockdomain capability flags */
+#define CLKDM_CAN_FORCE_SLEEP (1 << 0)
+#define CLKDM_CAN_FORCE_WAKEUP (1 << 1)
+#define CLKDM_CAN_ENABLE_AUTO (1 << 2)
+#define CLKDM_CAN_DISABLE_AUTO (1 << 3)
+
+#define CLKDM_CAN_HWSUP (CLKDM_CAN_ENABLE_AUTO | CLKDM_CAN_DISABLE_AUTO)
+#define CLKDM_CAN_SWSUP (CLKDM_CAN_FORCE_SLEEP | CLKDM_CAN_FORCE_WAKEUP)
+#define CLKDM_CAN_HWSUP_SWSUP (CLKDM_CAN_SWSUP | CLKDM_CAN_HWSUP)
+
+/* OMAP24XX CM_CLKSTCTRL_*.AUTOSTATE_* register bit values */
+#define OMAP24XX_CLKSTCTRL_DISABLE_AUTO 0x0
+#define OMAP24XX_CLKSTCTRL_ENABLE_AUTO 0x1
+
+/* OMAP3XXX CM_CLKSTCTRL_*.CLKTRCTRL_* register bit values */
+#define OMAP34XX_CLKSTCTRL_DISABLE_AUTO 0x0
+#define OMAP34XX_CLKSTCTRL_FORCE_SLEEP 0x1
+#define OMAP34XX_CLKSTCTRL_FORCE_WAKEUP 0x2
+#define OMAP34XX_CLKSTCTRL_ENABLE_AUTO 0x3
+
+/*
+ * struct clkdm_pwrdm_autodep - a powerdomain that should have wkdeps
+ * and sleepdeps added when a powerdomain should stay active in hwsup mode;
+ * and conversely, removed when the powerdomain should be allowed to go
+ * inactive in hwsup mode.
+ */
+struct clkdm_pwrdm_autodep {
+
+ /* Name of the powerdomain to add a wkdep/sleepdep on */
+ const char *pwrdm_name;
+
+ /* Powerdomain pointer (looked up at clkdm_init() time) */
+ struct powerdomain *pwrdm;
+
+ /* OMAP chip types that this clockdomain dep is valid on */
+ const struct omap_chip_id omap_chip;
+
+};
+
+struct clockdomain {
+
+ /* Clockdomain name */
+ const char *name;
+
+ /* Powerdomain enclosing this clockdomain */
+ const char *pwrdm_name;
+
+ /* CLKTRCTRL/AUTOSTATE field mask in CM_CLKSTCTRL reg */
+ const u16 clktrctrl_mask;
+
+ /* Clockdomain capability flags */
+ const u8 flags;
+
+ /* OMAP chip types that this clockdomain is valid on */
+ const struct omap_chip_id omap_chip;
+
+ /* Usecount tracking */
+ atomic_t usecount;
+
+ /* Powerdomain pointer assigned at clkdm_register() */
+ struct powerdomain *pwrdm;
+
+ struct list_head node;
+
+};
+
+void clkdm_init(struct clockdomain **clkdms, struct clkdm_pwrdm_autodep *autodeps);
+int clkdm_register(struct clockdomain *clkdm);
+int clkdm_unregister(struct clockdomain *clkdm);
+struct clockdomain *clkdm_lookup(const char *name);
+
+int clkdm_for_each(int (*fn)(struct clockdomain *clkdm));
+struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
+
+void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
+void omap2_clkdm_deny_idle(struct clockdomain *clkdm);
+
+int omap2_clkdm_wakeup(struct clockdomain *clkdm);
+int omap2_clkdm_sleep(struct clockdomain *clkdm);
+
+int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk);
+int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk);
+
+#endif