OMAP: clockdomain: Arch specific funcs to handle deps

Define the following architecture specific funtions for omap2/3
.clkdm_add_wkdep
.clkdm_del_wkdep
.clkdm_read_wkdep
.clkdm_clear_all_wkdeps
.clkdm_add_sleepdep
.clkdm_del_sleepdep
.clkdm_read_sleepdep
.clkdm_clear_all_sleepdeps

Convert the platform-independent framework to call these functions.
With this also move the clkdm lookups for all wkdep_srcs and
sleepdep_srcs at clkdm_init.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: fixed loop termination conditions in omap*_clkdm_clear_all_*();
 thanks to Kevin Hilman for finding and helping fix those bugs; also
 avoid re-resolving clockdomains during init; abstracted out clkdm_dep walk]
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/Makefile

@@ -102,8 +102,10 @@ obj-$(CONFIG_ARCH_OMAP4)		+= $(powerdomain-common) \
 
 # PRCM clockdomain control
 obj-$(CONFIG_ARCH_OMAP2)		+= clockdomain.o \
+					   clockdomain2xxx_3xxx.o \
 					   clockdomains2xxx_3xxx_data.o
 obj-$(CONFIG_ARCH_OMAP3)		+= clockdomain.o \
+					   clockdomain2xxx_3xxx.o \
 					   clockdomains2xxx_3xxx_data.o
 obj-$(CONFIG_ARCH_OMAP4)		+= clockdomain.o \
 					   clockdomains44xx_data.o

arch/arm/mach-omap2/clockdomain.c

@@ -287,6 +287,32 @@ static void _disable_hwsup(struct clockdomain *clkdm)
 		BUG();
 }
 
+/**
+ * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms
+ * @clkdm: clockdomain that we are resolving dependencies for
+ * @clkdm_deps: ptr to array of struct clkdm_deps to resolve
+ *
+ * Iterates through @clkdm_deps, looking up the struct clockdomain named by
+ * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep.
+ * No return value.
+ */
+static void _resolve_clkdm_deps(struct clockdomain *clkdm,
+				struct clkdm_dep *clkdm_deps)
+{
+	struct clkdm_dep *cd;
+
+	for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) {
+		if (!omap_chip_is(cd->omap_chip))
+			continue;
+		if (cd->clkdm)
+			continue;
+		cd->clkdm = _clkdm_lookup(cd->clkdm_name);
+
+		WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen",
+		     clkdm->name, cd->clkdm_name);
+	}
+}
+
 /* Public functions */
 
 /**
@@ -333,7 +359,10 @@ void clkdm_init(struct clockdomain **clkdms,
 		else if (clkdm->flags & CLKDM_CAN_DISABLE_AUTO)
 			omap2_clkdm_deny_idle(clkdm);
 
+		_resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs);
 		clkdm_clear_all_wkdeps(clkdm);
+
+		_resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs);
 		clkdm_clear_all_sleepdeps(clkdm);
 	}
 }
@@ -430,6 +459,7 @@ struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm)
 int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
+	int ret = 0;
 
 	if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
 		pr_err("clockdomain: %s/%s: %s: not yet implemented\n",
@@ -441,21 +471,26 @@ int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
-	if (IS_ERR(cd)) {
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep)
+		ret = -EINVAL;
+
+	if (ret) {
 		pr_debug("clockdomain: hardware cannot set/clear wake up of "
 			 "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
-		return PTR_ERR(cd);
+		return ret;
 	}
 
 	if (atomic_inc_return(&cd->wkdep_usecount) == 1) {
 		pr_debug("clockdomain: hardware will wake up %s when %s wakes "
 			 "up\n", clkdm1->name, clkdm2->name);
 
-		omap2_prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
+		ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
-				     clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
 	}
 
-	return 0;
+	return ret;
 }
 
 /**
@@ -471,6 +506,7 @@ int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
+	int ret = 0;
 
 	if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
 		pr_err("clockdomain: %s/%s: %s: not yet implemented\n",
@@ -482,21 +518,26 @@ int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
-	if (IS_ERR(cd)) {
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep)
+		ret = -EINVAL;
+
+	if (ret) {
 		pr_debug("clockdomain: hardware cannot set/clear wake up of "
 			 "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
-		return PTR_ERR(cd);
+		return ret;
 	}
 
 	if (atomic_dec_return(&cd->wkdep_usecount) == 0) {
 		pr_debug("clockdomain: hardware will no longer wake up %s "
 			 "after %s wakes up\n", clkdm1->name, clkdm2->name);
 
-		omap2_prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
+		ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
-				       clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
 	}
 
-	return 0;
+	return ret;
 }
 
 /**
@@ -516,6 +557,7 @@ int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
+	int ret = 0;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
@@ -527,15 +569,20 @@ int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 	}
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs);
-	if (IS_ERR(cd)) {
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_read_wkdep)
+		ret = -EINVAL;
+
+	if (ret) {
 		pr_debug("clockdomain: hardware cannot set/clear wake up of "
 			 "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
-		return PTR_ERR(cd);
+		return ret;
 	}
 
 	/* XXX It's faster to return the atomic wkdep_usecount */
-	return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP,
+	return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2);
-				       (1 << clkdm2->dep_bit));
 }
 
 /**
@@ -550,9 +597,6 @@ int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
  */
 int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
 {
-	struct clkdm_dep *cd;
-	u32 mask = 0;
-
 	if (!cpu_is_omap24xx() && !cpu_is_omap34xx()) {
 		pr_err("clockdomain: %s: %s: not yet implemented\n",
 		       clkdm->name, __func__);
@@ -562,21 +606,10 @@ int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
 	if (!clkdm)
 		return -EINVAL;
 
-	for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
+	if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_wkdeps)
-		if (!omap_chip_is(cd->omap_chip))
+		return -EINVAL;
-			continue;
 
-		if (!cd->clkdm && cd->clkdm_name)
+	return arch_clkdm->clkdm_clear_all_wkdeps(clkdm);
-			cd->clkdm = _clkdm_lookup(cd->clkdm_name);
-
-		/* PRM accesses are slow, so minimize them */
-		mask |= 1 << cd->clkdm->dep_bit;
-		atomic_set(&cd->wkdep_usecount, 0);
-	}
-
-	omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs, PM_WKDEP);
-
-	return 0;
 }
 
 /**
@@ -594,31 +627,33 @@ int clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
 int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-
+	int ret = 0;
-	if (!cpu_is_omap34xx())
-		return -EINVAL;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
-	if (IS_ERR(cd)) {
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep)
+		ret = -EINVAL;
+
+	if (ret) {
 		pr_debug("clockdomain: hardware cannot set/clear sleep "
 			 "dependency affecting %s from %s\n", clkdm1->name,
 			 clkdm2->name);
-		return PTR_ERR(cd);
+		return ret;
 	}
 
 	if (atomic_inc_return(&cd->sleepdep_usecount) == 1) {
 		pr_debug("clockdomain: will prevent %s from sleeping if %s "
 			 "is active\n", clkdm1->name, clkdm2->name);
 
-		omap2_cm_set_mod_reg_bits((1 << clkdm2->dep_bit),
+		ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2);
-				    clkdm1->pwrdm.ptr->prcm_offs,
-				    OMAP3430_CM_SLEEPDEP);
 	}
 
-	return 0;
+	return ret;
 }
 
 /**
@@ -636,19 +671,23 @@ int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-
+	int ret = 0;
-	if (!cpu_is_omap34xx())
-		return -EINVAL;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
-	if (IS_ERR(cd)) {
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep)
+		ret = -EINVAL;
+
+	if (ret) {
 		pr_debug("clockdomain: hardware cannot set/clear sleep "
 			 "dependency affecting %s from %s\n", clkdm1->name,
 			 clkdm2->name);
-		return PTR_ERR(cd);
+		return ret;
 	}
 
 	if (atomic_dec_return(&cd->sleepdep_usecount) == 0) {
@@ -656,12 +695,10 @@ int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 			 "sleeping if %s is active\n", clkdm1->name,
 			 clkdm2->name);
 
-		omap2_cm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
+		ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2);
-				      clkdm1->pwrdm.ptr->prcm_offs,
-				      OMAP3430_CM_SLEEPDEP);
 	}
 
-	return 0;
+	return ret;
 }
 
 /**
@@ -683,25 +720,27 @@ int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
 {
 	struct clkdm_dep *cd;
-
+	int ret = 0;
-	if (!cpu_is_omap34xx())
-		return -EINVAL;
 
 	if (!clkdm1 || !clkdm2)
 		return -EINVAL;
 
 	cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs);
-	if (IS_ERR(cd)) {
+	if (IS_ERR(cd))
+		ret = PTR_ERR(cd);
+
+	if (!arch_clkdm || !arch_clkdm->clkdm_read_sleepdep)
+		ret = -EINVAL;
+
+	if (ret) {
 		pr_debug("clockdomain: hardware cannot set/clear sleep "
 			 "dependency affecting %s from %s\n", clkdm1->name,
 			 clkdm2->name);
-		return PTR_ERR(cd);
+		return ret;
 	}
 
 	/* XXX It's faster to return the atomic sleepdep_usecount */
-	return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
+	return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2);
-				       OMAP3430_CM_SLEEPDEP,
-				       (1 << clkdm2->dep_bit));
 }
 
 /**
@@ -716,31 +755,13 @@ int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
  */
 int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
 {
-	struct clkdm_dep *cd;
-	u32 mask = 0;
-
-	if (!cpu_is_omap34xx())
-		return -EINVAL;
-
 	if (!clkdm)
 		return -EINVAL;
 
-	for (cd = clkdm->sleepdep_srcs; cd && cd->clkdm_name; cd++) {
+	if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_sleepdeps)
-		if (!omap_chip_is(cd->omap_chip))
+		return -EINVAL;
-			continue;
 
-		if (!cd->clkdm && cd->clkdm_name)
+	return arch_clkdm->clkdm_clear_all_sleepdeps(clkdm);
-			cd->clkdm = _clkdm_lookup(cd->clkdm_name);
-
-		/* PRM accesses are slow, so minimize them */
-		mask |= 1 << cd->clkdm->dep_bit;
-		atomic_set(&cd->sleepdep_usecount, 0);
-	}
-
-	omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
-			       OMAP3430_CM_SLEEPDEP);
-
-	return 0;
 }
 
 /**

arch/arm/mach-omap2/clockdomain.h

@@ -176,7 +176,11 @@ 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);
 
-extern void __init omap2_clockdomains_init(void);
+extern void __init omap2xxx_clockdomains_init(void);
+extern void __init omap3xxx_clockdomains_init(void);
 extern void __init omap44xx_clockdomains_init(void);
 
+extern struct clkdm_ops omap2_clkdm_operations;
+extern struct clkdm_ops omap3_clkdm_operations;
+
 #endif

arch/arm/mach-omap2/clockdomain2xxx_3xxx.c

@@ -0,0 +1,130 @@
+/*
+ * OMAP2 and OMAP3 clockdomain control
+ *
+ * Copyright (C) 2008-2010 Texas Instruments, Inc.
+ * Copyright (C) 2008-2010 Nokia Corporation
+ *
+ * Derived from mach-omap2/clockdomain.c written by Paul Walmsley
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * 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.
+ */
+
+#include <linux/types.h>
+#include <plat/prcm.h>
+#include "prm.h"
+#include "prm2xxx_3xxx.h"
+#include "cm.h"
+#include "cm2xxx_3xxx.h"
+#include "cm-regbits-24xx.h"
+#include "cm-regbits-34xx.h"
+#include "clockdomain.h"
+
+static int omap2_clkdm_add_wkdep(struct clockdomain *clkdm1,
+						struct clockdomain *clkdm2)
+{
+	omap2_prm_set_mod_reg_bits((1 << clkdm2->dep_bit),
+				clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
+	return 0;
+}
+
+static int omap2_clkdm_del_wkdep(struct clockdomain *clkdm1,
+						 struct clockdomain *clkdm2)
+{
+	omap2_prm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
+				clkdm1->pwrdm.ptr->prcm_offs, PM_WKDEP);
+	return 0;
+}
+
+static int omap2_clkdm_read_wkdep(struct clockdomain *clkdm1,
+						 struct clockdomain *clkdm2)
+{
+	return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
+				PM_WKDEP, (1 << clkdm2->dep_bit));
+}
+
+static int omap2_clkdm_clear_all_wkdeps(struct clockdomain *clkdm)
+{
+	struct clkdm_dep *cd;
+	u32 mask = 0;
+
+	for (cd = clkdm->wkdep_srcs; cd && cd->clkdm_name; cd++) {
+		if (!omap_chip_is(cd->omap_chip))
+			continue;
+		if (!cd->clkdm)
+			continue; /* only happens if data is erroneous */
+
+		/* PRM accesses are slow, so minimize them */
+		mask |= 1 << cd->clkdm->dep_bit;
+		atomic_set(&cd->wkdep_usecount, 0);
+	}
+
+	omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
+				 PM_WKDEP);
+	return 0;
+}
+
+static int omap3_clkdm_add_sleepdep(struct clockdomain *clkdm1,
+						 struct clockdomain *clkdm2)
+{
+	omap2_cm_set_mod_reg_bits((1 << clkdm2->dep_bit),
+				clkdm1->pwrdm.ptr->prcm_offs,
+				OMAP3430_CM_SLEEPDEP);
+	return 0;
+}
+
+static int omap3_clkdm_del_sleepdep(struct clockdomain *clkdm1,
+						 struct clockdomain *clkdm2)
+{
+	omap2_cm_clear_mod_reg_bits((1 << clkdm2->dep_bit),
+				clkdm1->pwrdm.ptr->prcm_offs,
+				OMAP3430_CM_SLEEPDEP);
+	return 0;
+}
+
+static int omap3_clkdm_read_sleepdep(struct clockdomain *clkdm1,
+						 struct clockdomain *clkdm2)
+{
+	return omap2_prm_read_mod_bits_shift(clkdm1->pwrdm.ptr->prcm_offs,
+				OMAP3430_CM_SLEEPDEP, (1 << clkdm2->dep_bit));
+}
+
+static int omap3_clkdm_clear_all_sleepdeps(struct clockdomain *clkdm)
+{
+	struct clkdm_dep *cd;
+	u32 mask = 0;
+
+	for (cd = clkdm->sleepdep_srcs; cd && cd->clkdm_name; cd++) {
+		if (!omap_chip_is(cd->omap_chip))
+			continue;
+		if (!cd->clkdm)
+			continue; /* only happens if data is erroneous */
+
+		/* PRM accesses are slow, so minimize them */
+		mask |= 1 << cd->clkdm->dep_bit;
+		atomic_set(&cd->sleepdep_usecount, 0);
+	}
+	omap2_prm_clear_mod_reg_bits(mask, clkdm->pwrdm.ptr->prcm_offs,
+				OMAP3430_CM_SLEEPDEP);
+	return 0;
+}
+
+struct clkdm_ops omap2_clkdm_operations = {
+	.clkdm_add_wkdep	= omap2_clkdm_add_wkdep,
+	.clkdm_del_wkdep	= omap2_clkdm_del_wkdep,
+	.clkdm_read_wkdep	= omap2_clkdm_read_wkdep,
+	.clkdm_clear_all_wkdeps	= omap2_clkdm_clear_all_wkdeps,
+};
+
+struct clkdm_ops omap3_clkdm_operations = {
+	.clkdm_add_wkdep	= omap2_clkdm_add_wkdep,
+	.clkdm_del_wkdep	= omap2_clkdm_del_wkdep,
+	.clkdm_read_wkdep	= omap2_clkdm_read_wkdep,
+	.clkdm_clear_all_wkdeps	= omap2_clkdm_clear_all_wkdeps,
+	.clkdm_add_sleepdep	= omap3_clkdm_add_sleepdep,
+	.clkdm_del_sleepdep	= omap3_clkdm_del_sleepdep,
+	.clkdm_read_sleepdep	= omap3_clkdm_read_sleepdep,
+	.clkdm_clear_all_sleepdeps	= omap3_clkdm_clear_all_sleepdeps,
+};

arch/arm/mach-omap2/clockdomains2xxx_3xxx_data.c

@@ -854,7 +854,12 @@ static struct clockdomain *clockdomains_omap2[] __initdata = {
 	NULL,
 };
 
-void __init omap2_clockdomains_init(void)
+void __init omap2xxx_clockdomains_init(void)
 {
-	clkdm_init(clockdomains_omap2, clkdm_autodeps, NULL);
+	clkdm_init(clockdomains_omap2, clkdm_autodeps, &omap2_clkdm_operations);
+}
+
+void __init omap3xxx_clockdomains_init(void)
+{
+	clkdm_init(clockdomains_omap2, clkdm_autodeps, &omap3_clkdm_operations);
 }

arch/arm/mach-omap2/io.c

@@ -357,15 +357,15 @@ void __init omap2_init_common_infrastructure(void)
 
 	if (cpu_is_omap242x()) {
 		omap2xxx_powerdomains_init();
-		omap2_clockdomains_init();
+		omap2xxx_clockdomains_init();
 		omap2420_hwmod_init();
 	} else if (cpu_is_omap243x()) {
 		omap2xxx_powerdomains_init();
-		omap2_clockdomains_init();
+		omap2xxx_clockdomains_init();
 		omap2430_hwmod_init();
 	} else if (cpu_is_omap34xx()) {
 		omap3xxx_powerdomains_init();
-		omap2_clockdomains_init();
+		omap3xxx_clockdomains_init();
 		omap3xxx_hwmod_init();
 	} else if (cpu_is_omap44xx()) {
 		omap44xx_powerdomains_init();