diff options
Diffstat (limited to 'drivers/clk/clk.c')
| -rw-r--r-- | drivers/clk/clk.c | 631 |
1 files changed, 406 insertions, 225 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index b701e7c195e4..d60c193b81aa 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -37,6 +37,15 @@ static HLIST_HEAD(clk_root_list); static HLIST_HEAD(clk_orphan_list); static LIST_HEAD(clk_notifier_list); +static long clk_core_get_accuracy(struct clk_core *clk); +static unsigned long clk_core_get_rate(struct clk_core *clk); +static int clk_core_get_phase(struct clk_core *clk); +static bool clk_core_is_prepared(struct clk_core *clk); +static bool clk_core_is_enabled(struct clk_core *clk); +static unsigned long clk_core_round_rate_nolock(struct clk_core *clk, + unsigned long rate); +static struct clk_core *clk_core_lookup(const char *name); + /*** locking ***/ static void clk_prepare_lock(void) { @@ -114,7 +123,8 @@ static struct hlist_head *orphan_list[] = { NULL, }; -static void clk_summary_show_one(struct seq_file *s, struct clk *c, int level) +static void clk_summary_show_one(struct seq_file *s, struct clk_core *c, + int level) { if (!c) return; @@ -122,14 +132,14 @@ static void clk_summary_show_one(struct seq_file *s, struct clk *c, int level) seq_printf(s, "%*s%-*s %11d %12d %11lu %10lu %-3d\n", level * 3 + 1, "", 30 - level * 3, c->name, - c->enable_count, c->prepare_count, clk_get_rate(c), - clk_get_accuracy(c), clk_get_phase(c)); + c->enable_count, c->prepare_count, clk_core_get_rate(c), + clk_core_get_accuracy(c), clk_core_get_phase(c)); } -static void clk_summary_show_subtree(struct seq_file *s, struct clk *c, +static void clk_summary_show_subtree(struct seq_file *s, struct clk_core *c, int level) { - struct clk *child; + struct clk_core *child; if (!c) return; @@ -142,7 +152,7 @@ static void clk_summary_show_subtree(struct seq_file *s, struct clk *c, static int clk_summary_show(struct seq_file *s, void *data) { - struct clk *c; + struct clk_core *c; struct hlist_head **lists = (struct hlist_head **)s->private; seq_puts(s, " clock enable_cnt prepare_cnt rate accuracy phase\n"); @@ -172,7 +182,7 @@ static const struct file_operations clk_summary_fops = { .release = single_release, }; -static void clk_dump_one(struct seq_file *s, struct clk *c, int level) +static void clk_dump_one(struct seq_file *s, struct clk_core *c, int level) { if (!c) return; @@ -180,14 +190,14 @@ static void clk_dump_one(struct seq_file *s, struct clk *c, int level) seq_printf(s, "\"%s\": { ", c->name); seq_printf(s, "\"enable_count\": %d,", c->enable_count); seq_printf(s, "\"prepare_count\": %d,", c->prepare_count); - seq_printf(s, "\"rate\": %lu", clk_get_rate(c)); - seq_printf(s, "\"accuracy\": %lu", clk_get_accuracy(c)); - seq_printf(s, "\"phase\": %d", clk_get_phase(c)); + seq_printf(s, "\"rate\": %lu", clk_core_get_rate(c)); + seq_printf(s, "\"accuracy\": %lu", clk_core_get_accuracy(c)); + seq_printf(s, "\"phase\": %d", clk_core_get_phase(c)); } -static void clk_dump_subtree(struct seq_file *s, struct clk *c, int level) +static void clk_dump_subtree(struct seq_file *s, struct clk_core *c, int level) { - struct clk *child; + struct clk_core *child; if (!c) return; @@ -204,7 +214,7 @@ static void clk_dump_subtree(struct seq_file *s, struct clk *c, int level) static int clk_dump(struct seq_file *s, void *data) { - struct clk *c; + struct clk_core *c; bool first_node = true; struct hlist_head **lists = (struct hlist_head **)s->private; @@ -240,7 +250,7 @@ static const struct file_operations clk_dump_fops = { .release = single_release, }; -static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry) +static int clk_debug_create_one(struct clk_core *clk, struct dentry *pdentry) { struct dentry *d; int ret = -ENOMEM; @@ -315,7 +325,7 @@ out: * initialized. Otherwise it bails out early since the debugfs clk tree * will be created lazily by clk_debug_init as part of a late_initcall. */ -static int clk_debug_register(struct clk *clk) +static int clk_debug_register(struct clk_core *clk) { int ret = 0; @@ -340,7 +350,7 @@ unlock: * debugfs clk tree if clk->dentry points to debugfs created by * clk_debug_register in __clk_init. */ -static void clk_debug_unregister(struct clk *clk) +static void clk_debug_unregister(struct clk_core *clk) { mutex_lock(&clk_debug_lock); hlist_del_init(&clk->debug_node); @@ -354,8 +364,9 @@ struct dentry *clk_debugfs_add_file(struct clk_hw *hw, char *name, umode_t mode, { struct dentry *d = NULL; - if (hw->clk->dentry) - d = debugfs_create_file(name, mode, hw->clk->dentry, data, fops); + if (hw->core->dentry) + d = debugfs_create_file(name, mode, hw->core->dentry, data, + fops); return d; } @@ -375,7 +386,7 @@ EXPORT_SYMBOL_GPL(clk_debugfs_add_file); */ static int __init clk_debug_init(void) { - struct clk *clk; + struct clk_core *clk; struct dentry *d; rootdir = debugfs_create_dir("clk", NULL); @@ -414,19 +425,20 @@ static int __init clk_debug_init(void) } late_initcall(clk_debug_init); #else -static inline int clk_debug_register(struct clk *clk) { return 0; } -static inline void clk_debug_reparent(struct clk *clk, struct clk *new_parent) +static inline int clk_debug_register(struct clk_core *clk) { return 0; } +static inline void clk_debug_reparent(struct clk_core *clk, + struct clk_core *new_parent) { } -static inline void clk_debug_unregister(struct clk *clk) +static inline void clk_debug_unregister(struct clk_core *clk) { } #endif /* caller must hold prepare_lock */ -static void clk_unprepare_unused_subtree(struct clk *clk) +static void clk_unprepare_unused_subtree(struct clk_core *clk) { - struct clk *child; + struct clk_core *child; hlist_for_each_entry(child, &clk->children, child_node) clk_unprepare_unused_subtree(child); @@ -437,7 +449,7 @@ static void clk_unprepare_unused_subtree(struct clk *clk) if (clk->flags & CLK_IGNORE_UNUSED) return; - if (__clk_is_prepared(clk)) { + if (clk_core_is_prepared(clk)) { if (clk->ops->unprepare_unused) clk->ops->unprepare_unused(clk->hw); else if (clk->ops->unprepare) @@ -446,9 +458,9 @@ static void clk_unprepare_unused_subtree(struct clk *clk) } /* caller must hold prepare_lock */ -static void clk_disable_unused_subtree(struct clk *clk) +static void clk_disable_unused_subtree(struct clk_core *clk) { - struct clk *child; + struct clk_core *child; unsigned long flags; hlist_for_each_entry(child, &clk->children, child_node) @@ -467,7 +479,7 @@ static void clk_disable_unused_subtree(struct clk *clk) * sequence. call .disable_unused if available, otherwise fall * back to .disable */ - if (__clk_is_enabled(clk)) { + if (clk_core_is_enabled(clk)) { if (clk->ops->disable_unused) clk->ops->disable_unused(clk->hw); else if (clk->ops->disable) @@ -488,7 +500,7 @@ __setup("clk_ignore_unused", clk_ignore_unused_setup); static int clk_disable_unused(void) { - struct clk *clk; + struct clk_core *clk; if (clk_ignore_unused) { pr_warn("clk: Not disabling unused clocks\n"); @@ -519,48 +531,65 @@ late_initcall_sync(clk_disable_unused); const char *__clk_get_name(struct clk *clk) { - return !clk ? NULL : clk->name; + return !clk ? NULL : clk->core->name; } EXPORT_SYMBOL_GPL(__clk_get_name); struct clk_hw *__clk_get_hw(struct clk *clk) { - return !clk ? NULL : clk->hw; + return !clk ? NULL : clk->core->hw; } EXPORT_SYMBOL_GPL(__clk_get_hw); u8 __clk_get_num_parents(struct clk *clk) { - return !clk ? 0 : clk->num_parents; + return !clk ? 0 : clk->core->num_parents; } EXPORT_SYMBOL_GPL(__clk_get_num_parents); struct clk *__clk_get_parent(struct clk *clk) { - return !clk ? NULL : clk->parent; + if (!clk) + return NULL; + + /* TODO: Create a per-user clk and change callers to call clk_put */ + return !clk->core->parent ? NULL : clk->core->parent->hw->clk; } EXPORT_SYMBOL_GPL(__clk_get_parent); -struct clk *clk_get_parent_by_index(struct clk *clk, u8 index) +static struct clk_core *clk_core_get_parent_by_index(struct clk_core *clk, + u8 index) { if (!clk || index >= clk->num_parents) return NULL; else if (!clk->parents) - return __clk_lookup(clk->parent_names[index]); + return clk_core_lookup(clk->parent_names[index]); else if (!clk->parents[index]) return clk->parents[index] = - __clk_lookup(clk->parent_names[index]); + clk_core_lookup(clk->parent_names[index]); else return clk->parents[index]; } + +struct clk *clk_get_parent_by_index(struct clk *clk, u8 index) +{ + struct clk_core *parent; + + if (!clk) + return NULL; + + parent = clk_core_get_parent_by_index(clk->core, index); + + return !parent ? NULL : parent->hw->clk; +} EXPORT_SYMBOL_GPL(clk_get_parent_by_index); unsigned int __clk_get_enable_count(struct clk *clk) { - return !clk ? 0 : clk->enable_count; + return !clk ? 0 : clk->core->enable_count; } -unsigned long __clk_get_rate(struct clk *clk) +static unsigned long clk_core_get_rate_nolock(struct clk_core *clk) { unsigned long ret; @@ -580,9 +609,17 @@ unsigned long __clk_get_rate(struct clk *clk) out: return ret; } + +unsigned long __clk_get_rate(struct clk *clk) +{ + if (!clk) + return 0; + + return clk_core_get_rate_nolock(clk->core); +} EXPORT_SYMBOL_GPL(__clk_get_rate); -static unsigned long __clk_get_accuracy(struct clk *clk) +static unsigned long __clk_get_accuracy(struct clk_core *clk) { if (!clk) return 0; @@ -592,11 +629,11 @@ static unsigned long __clk_get_accuracy(struct clk *clk) unsigned long __clk_get_flags(struct clk *clk) { - return !clk ? 0 : clk->flags; + return !clk ? 0 : clk->core->flags; } EXPORT_SYMBOL_GPL(__clk_get_flags); -bool __clk_is_prepared(struct clk *clk) +static bool clk_core_is_prepared(struct clk_core *clk) { int ret; @@ -617,7 +654,15 @@ out: return !!ret; } -bool __clk_is_enabled(struct clk *clk) +bool __clk_is_prepared(struct clk *clk) +{ + if (!clk) + return false; + + return clk_core_is_prepared(clk->core); +} + +static bool clk_core_is_enabled(struct clk_core *clk) { int ret; @@ -637,12 +682,21 @@ bool __clk_is_enabled(struct clk *clk) out: return !!ret; } + +bool __clk_is_enabled(struct clk *clk) +{ + if (!clk) + return false; + + return clk_core_is_enabled(clk->core); +} EXPORT_SYMBOL_GPL(__clk_is_enabled); -static struct clk *__clk_lookup_subtree(const char *name, struct clk *clk) +static struct clk_core *__clk_lookup_subtree(const char *name, + struct clk_core *clk) { - struct clk *child; - struct clk *ret; + struct clk_core *child; + struct clk_core *ret; if (!strcmp(clk->name, name)) return clk; @@ -656,10 +710,10 @@ static struct clk *__clk_lookup_subtree(const char *name, struct clk *clk) return NULL; } -struct clk *__clk_lookup(const char *name) +static struct clk_core *clk_core_lookup(const char *name) { - struct clk *root_clk; - struct clk *ret; + struct clk_core *root_clk; + struct clk_core *ret; if (!name) return NULL; @@ -696,32 +750,32 @@ clk_mux_determine_rate_flags(struct clk_hw *hw, unsigned long rate, struct clk_hw **best_parent_p, unsigned long flags) { - struct clk *clk = hw->clk, *parent, *best_parent = NULL; + struct clk_core *core = hw->core, *parent, *best_parent = NULL; int i, num_parents; unsigned long parent_rate, best = 0; /* if NO_REPARENT flag set, pass through to current parent */ - if (clk->flags & CLK_SET_RATE_NO_REPARENT) { - parent = clk->parent; - if (clk->flags & CLK_SET_RATE_PARENT) - best = __clk_round_rate(parent, rate); + if (core->flags & CLK_SET_RATE_NO_REPARENT) { + parent = core->parent; + if (core->flags & CLK_SET_RATE_PARENT) + best = clk_core_round_rate_nolock(parent, rate); else if (parent) - best = __clk_get_rate(parent); + best = clk_core_get_rate_nolock(parent); else - best = __clk_get_rate(clk); + best = clk_core_get_rate_nolock(core); goto out; } /* find the parent that can provide the fastest rate <= rate */ - num_parents = clk->num_parents; + num_parents = core->num_parents; for (i = 0; i < num_parents; i++) { - parent = clk_get_parent_by_index(clk, i); + parent = clk_core_get_parent_by_index(core, i); if (!parent) continue; - if (clk->flags & CLK_SET_RATE_PARENT) - parent_rate = __clk_round_rate(parent, rate); + if (core->flags & CLK_SET_RATE_PARENT) + parent_rate = clk_core_round_rate_nolock(parent, rate); else - parent_rate = __clk_get_rate(parent); + parent_rate = clk_core_get_rate_nolock(parent); if (mux_is_better_rate(rate, parent_rate, best, flags)) { best_parent = parent; best = parent_rate; @@ -736,6 +790,13 @@ out: return best; } +struct clk *__clk_lookup(const char *name) +{ + struct clk_core *core = clk_core_lookup(name); + + return !core ? NULL : core->hw->clk; +} + /* * Helper for finding best parent to provide a given frequency. This can be used * directly as a determine_rate callback (e.g. for a mux), or from a more @@ -762,7 +823,7 @@ EXPORT_SYMBOL_GPL(__clk_mux_determine_rate_closest); /*** clk api ***/ -void __clk_unprepare(struct clk *clk) +static void clk_core_unprepare(struct clk_core *clk) { if (!clk) return; @@ -778,7 +839,7 @@ void __clk_unprepare(struct clk *clk) if (clk->ops->unprepare) clk->ops->unprepare(clk->hw); - __clk_unprepare(clk->parent); + clk_core_unprepare(clk->parent); } /** @@ -798,12 +859,12 @@ void clk_unprepare(struct clk *clk) return; clk_prepare_lock(); - __clk_unprepare(clk); + clk_core_unprepare(clk->core); clk_prepare_unlock(); } EXPORT_SYMBOL_GPL(clk_unprepare); -int __clk_prepare(struct clk *clk) +static int clk_core_prepare(struct clk_core *clk) { int ret = 0; @@ -811,14 +872,14 @@ int __clk_prepare(struct clk *clk) return 0; if (clk->prepare_count == 0) { - ret = __clk_prepare(clk->parent); + ret = clk_core_prepare(clk->parent); if (ret) return ret; if (clk->ops->prepare) { ret = clk->ops->prepare(clk->hw); if (ret) { - __clk_unprepare(clk->parent); + clk_core_unprepare(clk->parent); return ret; } } @@ -845,15 +906,18 @@ int clk_prepare(struct clk *clk) { int ret; + if (!clk) + return 0; + clk_prepare_lock(); - ret = __clk_prepare(clk); + ret = clk_core_prepare(clk->core); clk_prepare_unlock(); return ret; } EXPORT_SYMBOL_GPL(clk_prepare); -static void __clk_disable(struct clk *clk) +static void clk_core_disable(struct clk_core *clk) { if (!clk) return; @@ -867,7 +931,15 @@ static void __clk_disable(struct clk *clk) if (clk->ops->disable) clk->ops->disable(clk->hw); - __clk_disable(clk->parent); + clk_core_disable(clk->parent); +} + +static void __clk_disable(struct clk *clk) +{ + if (!clk) + return; + + clk_core_disable(clk->core); } /** @@ -895,7 +967,7 @@ void clk_disable(struct clk *clk) } EXPORT_SYMBOL_GPL(clk_disable); -static int __clk_enable(struct clk *clk) +static int clk_core_enable(struct clk_core *clk) { int ret = 0; @@ -906,7 +978,7 @@ static int __clk_enable(struct clk *clk) return -ESHUTDOWN; if (clk->enable_count == 0) { - ret = __clk_enable(clk->parent); + ret = clk_core_enable(clk->parent); if (ret) return ret; @@ -914,7 +986,7 @@ static int __clk_enable(struct clk *clk) if (clk->ops->enable) { ret = clk->ops->enable(clk->hw); if (ret) { - __clk_disable(clk->parent); + clk_core_disable(clk->parent); return ret; } } @@ -924,6 +996,14 @@ static int __clk_enable(struct clk *clk) return 0; } +static int __clk_enable(struct clk *clk) +{ + if (!clk) + return 0; + + return clk_core_enable(clk->core); +} + /** * clk_enable - ungate a clock * @clk: the clk being ungated @@ -950,17 +1030,11 @@ int clk_enable(struct clk *clk) } EXPORT_SYMBOL_GPL(clk_enable); -/** - * __clk_round_rate - round the given rate for a clk - * @clk: round the rate of this clock - * @rate: the rate which is to be rounded - * - * Caller must hold prepare_lock. Useful for clk_ops such as .set_rate - */ -unsigned long __clk_round_rate(struct clk *clk, unsigned long rate) +static unsigned long clk_core_round_rate_nolock(struct clk_core *clk, + unsigned long rate) { unsigned long parent_rate = 0; - struct clk *parent; + struct clk_core *parent; struct clk_hw *parent_hw; if (!clk) @@ -977,10 +1051,25 @@ unsigned long __clk_round_rate(struct clk *clk, unsigned long rate) } else if (clk->ops->round_rate) return clk->ops->round_rate(clk->hw, rate, &parent_rate); else if (clk->flags & CLK_SET_RATE_PARENT) - return __clk_round_rate(clk->parent, rate); + return clk_core_round_rate_nolock(clk->parent, rate); else return clk->rate; } + +/** + * __clk_round_rate - round the given rate for a clk + * @clk: round the rate of this clock + * @rate: the rate which is to be rounded + * + * Caller must hold prepare_lock. Useful for clk_ops such as .set_rate + */ +unsigned long __clk_round_rate(struct clk *clk, unsigned long rate) +{ + if (!clk) + return 0; + + return clk_core_round_rate_nolock(clk->core, rate); +} EXPORT_SYMBOL_GPL(__clk_round_rate); /** @@ -996,8 +1085,11 @@ long clk_round_rate(struct clk *clk, unsigned long rate) { unsigned long ret; + if (!clk) + return 0; + clk_prepare_lock(); - ret = __clk_round_rate(clk, rate); + ret = clk_core_round_rate_nolock(clk->core, rate); clk_prepare_unlock(); return ret; @@ -1018,22 +1110,21 @@ EXPORT_SYMBOL_GPL(clk_round_rate); * called if all went well, or NOTIFY_STOP or NOTIFY_BAD immediately if * a driver returns that. */ -static int __clk_notify(struct clk *clk, unsigned long msg, +static int __clk_notify(struct clk_core *clk, unsigned long msg, unsigned long old_rate, unsigned long new_rate) { struct clk_notifier *cn; struct clk_notifier_data cnd; int ret = NOTIFY_DONE; - cnd.clk = clk; cnd.old_rate = old_rate; cnd.new_rate = new_rate; list_for_each_entry(cn, &clk_notifier_list, node) { - if (cn->clk == clk) { + if (cn->clk->core == clk) { + cnd.clk = cn->clk; ret = srcu_notifier_call_chain(&cn->notifier_head, msg, &cnd); - break; } } @@ -1051,10 +1142,10 @@ static int __clk_notify(struct clk *clk, unsigned long msg, * * Caller must hold prepare_lock. */ -static void __clk_recalc_accuracies(struct clk *clk) +static void __clk_recalc_accuracies(struct clk_core *clk) { unsigned long parent_accuracy = 0; - struct clk *child; + struct clk_core *child; if (clk->parent) parent_accuracy = clk->parent->accuracy; @@ -1069,6 +1160,20 @@ static void __clk_recalc_accuracies(struct clk *clk) __clk_recalc_accuracies(child); } +static long clk_core_get_accuracy(struct clk_core *clk) +{ + unsigned long accuracy; + + clk_prepare_lock(); + if (clk && (clk->flags & CLK_GET_ACCURACY_NOCACHE)) + __clk_recalc_accuracies(clk); + + accuracy = __clk_get_accuracy(clk); + clk_prepare_unlock(); + + return accuracy; +} + /** * clk_get_accuracy - return the accuracy of clk * @clk: the clk whose accuracy is being returned @@ -1080,20 +1185,15 @@ static void __clk_recalc_accuracies(struct clk *clk) */ long clk_get_accuracy(struct clk *clk) { - unsigned long accuracy; - - clk_prepare_lock(); - if (clk && (clk->flags & CLK_GET_ACCURACY_NOCACHE)) - __clk_recalc_accuracies(clk); - - accuracy = __clk_get_accuracy(clk); - clk_prepare_unlock(); + if (!clk) + return 0; - return accuracy; + return clk_core_get_accuracy(clk->core); } EXPORT_SYMBOL_GPL(clk_get_accuracy); -static unsigned long clk_recalc(struct clk *clk, unsigned long parent_rate) +static unsigned long clk_recalc(struct clk_core *clk, + unsigned long parent_rate) { if (clk->ops->recalc_rate) return clk->ops->recalc_rate(clk->hw, parent_rate); @@ -1114,11 +1214,11 @@ static unsigned long clk_recalc(struct clk *clk, unsigned long parent_rate) * * Caller must hold prepare_lock. */ -static void __clk_recalc_rates(struct clk *clk, unsigned long msg) +static void __clk_recalc_rates(struct clk_core *clk, unsigned long msg) { unsigned long old_rate; unsigned long parent_rate = 0; - struct clk *child; + struct clk_core *child; old_rate = clk->rate; @@ -1138,15 +1238,7 @@ static void __clk_recalc_rates(struct clk *clk, unsigned long msg) __clk_recalc_rates(child, msg); } -/** - * clk_get_rate - return the rate of clk - * @clk: the clk whose rate is being returned - * - * Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag - * is set, which means a recalc_rate will be issued. - * If clk is NULL then returns 0. - */ -unsigned long clk_get_rate(struct clk *clk) +static unsigned long clk_core_get_rate(struct clk_core *clk) { unsigned long rate; @@ -1155,14 +1247,32 @@ unsigned long clk_get_rate(struct clk *clk) if (clk && (clk->flags & CLK_GET_RATE_NOCACHE)) __clk_recalc_rates(clk, 0); - rate = __clk_get_rate(clk); + rate = clk_core_get_rate_nolock(clk); clk_prepare_unlock(); return rate; } +EXPORT_SYMBOL_GPL(clk_core_get_rate); + +/** + * clk_get_rate - return the rate of clk + * @clk: the clk whose rate is being returned + * + * Simply returns the cached rate of the clk, unless CLK_GET_RATE_NOCACHE flag + * is set, which means a recalc_rate will be issued. + * If clk is NULL then returns 0. + */ +unsigned long clk_get_rate(struct clk *clk) +{ + if (!clk) + return 0; + + return clk_core_get_rate(clk->core); +} EXPORT_SYMBOL_GPL(clk_get_rate); -static int clk_fetch_parent_index(struct clk *clk, struct clk *parent) +static int clk_fetch_parent_index(struct clk_core *clk, + struct clk_core *parent) { int i; @@ -1176,7 +1286,7 @@ static int clk_fetch_parent_index(struct clk *clk, struct clk *parent) /* * find index of new parent clock using cached parent ptrs, * or if not yet cached, use string name comparison and cache - * them now to avoid future calls to __clk_lookup. + * them now to avoid future calls to clk_core_lookup. */ for (i = 0; i < clk->num_parents; i++) { if (clk->parents[i] == parent) @@ -1186,7 +1296,7 @@ static int clk_fetch_parent_index(struct clk *clk, struct clk *parent) continue; if (!strcmp(clk->parent_names[i], parent->name)) { - clk->parents[i] = __clk_lookup(parent->name); + clk->parents[i] = clk_core_lookup(parent->name); return i; } } @@ -1194,7 +1304,7 @@ static int clk_fetch_parent_index(struct clk *clk, struct clk *parent) return -EINVAL; } -static void clk_reparent(struct clk *clk, struct clk *new_parent) +static void clk_reparent(struct clk_core *clk, struct clk_core *new_parent) { hlist_del(&clk->child_node); @@ -1211,10 +1321,11 @@ static void clk_reparent(struct clk *clk, struct clk *new_parent) clk->parent = new_parent; } -static struct clk *__clk_set_parent_before(struct clk *clk, struct clk *parent) +static struct clk_core *__clk_set_parent_before(struct clk_core *clk, + struct clk_core *parent) { unsigned long flags; - struct clk *old_parent = clk->parent; + struct clk_core *old_parent = clk->parent; /* * Migrate prepare state between parents and prevent race with @@ -1234,9 +1345,9 @@ static struct clk *__clk_set_parent_before(struct clk *clk, struct clk *parent) * See also: Comment for clk_set_parent() below. */ if (clk->prepare_count) { - __clk_prepare(parent); - clk_enable(parent); - clk_enable(clk); + clk_core_prepare(parent); + clk_core_enable(parent); + clk_core_enable(clk); } /* update the clk tree topology */ @@ -1247,25 +1358,27 @@ static struct clk *__clk_set_parent_before(struct clk *clk, struct clk *parent) return old_parent; } -static void __clk_set_parent_after(struct clk *clk, struct clk *parent, - struct clk *old_parent) +static void __clk_set_parent_after(struct clk_core *core, + struct clk_core *parent, + struct clk_core *old_parent) { /* * Finish the migration of prepare state and undo the changes done * for preventing a race with clk_enable(). */ - if (clk->prepare_count) { - clk_disable(clk); - clk_disable(old_parent); - __clk_unprepare(old_parent); + if (core->prepare_count) { + clk_core_disable(core); + clk_core_disable(old_parent); + clk_core_unprepare(old_parent); } } -static int __clk_set_parent(struct clk *clk, struct clk *parent, u8 p_index) +static int __clk_set_parent(struct clk_core *clk, struct clk_core *parent, + u8 p_index) { unsigned long flags; int ret = 0; - struct clk *old_parent; + struct clk_core *old_parent; old_parent = __clk_set_parent_before(clk, parent); @@ -1279,9 +1392,9 @@ static int __clk_set_parent(struct clk *clk, struct clk *parent, u8 p_index) clk_enable_unlock(flags); if (clk->prepare_count) { - clk_disable(clk); - clk_disable(parent); - __clk_unprepare(parent); + clk_core_disable(clk); + clk_core_disable(parent); + clk_core_unprepare(parent); } return ret; } @@ -1307,9 +1420,10 @@ static int __clk_set_parent(struct clk *clk, struct clk *parent, u8 p_index) * * Caller must hold prepare_lock. */ -static int __clk_speculate_rates(struct clk *clk, unsigned long parent_rate) +static int __clk_speculate_rates(struct clk_core *clk, + unsigned long parent_rate) { - struct clk *child; + struct clk_core *child; unsigned long new_rate; int ret = NOTIFY_DONE; @@ -1335,10 +1449,10 @@ out: return ret; } -static void clk_calc_subtree(struct clk *clk, unsigned long new_rate, - struct clk *new_parent, u8 p_index) +static void clk_calc_subtree(struct clk_core *clk, unsigned long new_rate, + struct clk_core *new_parent, u8 p_index) { - struct clk *child; + struct clk_core *child; clk->new_rate = new_rate; clk->new_parent = new_parent; @@ -1358,10 +1472,11 @@ static void clk_calc_subtree(struct clk *clk, unsigned long new_rate, * calculate the new rates returning the topmost clock that has to be * changed. */ -static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate) +static struct clk_core *clk_calc_new_rates(struct clk_core *clk, + unsigned long rate) { - struct clk *top = clk; - struct clk *old_parent, *parent; + struct clk_core *top = clk; + struct clk_core *old_parent, *parent; struct clk_hw *parent_hw; unsigned long best_parent_rate = 0; unsigned long new_rate; @@ -1382,7 +1497,7 @@ static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate) new_rate = clk->ops->determine_rate(clk->hw, rate, &best_parent_rate, &parent_hw); - parent = parent_hw ? parent_hw->clk : NULL; + parent = parent_hw ? parent_hw->core : NULL; } else if (clk->ops->round_rate) { new_rate = clk->ops->round_rate(clk->hw, rate, &best_parent_rate); @@ -1430,9 +1545,10 @@ out: * so that in case of an error we can walk down the whole tree again and * abort the change. */ -static struct clk *clk_propagate_rate_change(struct clk *clk, unsigned long event) +static struct clk_core *clk_propagate_rate_change(struct clk_core *clk, + unsigned long event) { - struct clk *child, *tmp_clk, *fail_clk = NULL; + struct clk_core *child, *tmp_clk, *fail_clk = NULL; int ret = NOTIFY_DONE; if (clk->rate == clk->new_rate) @@ -1467,14 +1583,14 @@ static struct clk *clk_propagate_rate_change(struct clk *clk, unsigned long even * walk down a subtree and set the new rates notifying the rate * change on the way */ -static void clk_change_rate(struct clk *clk) +static void clk_change_rate(struct clk_core *clk) { - struct clk *child; + struct clk_core *child; struct hlist_node *tmp; unsigned long old_rate; unsigned long best_parent_rate = 0; bool skip_set_rate = false; - struct clk *old_parent; + struct clk_core *old_parent; old_rate = clk->rate; @@ -1545,7 +1661,7 @@ static void clk_change_rate(struct clk *clk) */ int clk_set_rate(struct clk *clk, unsigned long rate) { - struct clk *top, *fail_clk; + struct clk_core *top, *fail_clk; int ret = 0; if (!clk) @@ -1558,13 +1674,14 @@ int clk_set_rate(struct clk *clk, unsigned long rate) if (rate == clk_get_rate(clk)) goto out; - if ((clk->flags & CLK_SET_RATE_GATE) && clk->prepare_count) { + if ((clk->core->flags & CLK_SET_RATE_GATE) && + clk->core->prepare_count) { ret = -EBUSY; goto out; } /* calculate new rates and get the topmost changed clock */ - top = clk_calc_new_rates(clk, rate); + top = clk_calc_new_rates(clk->core, rate); if (!top) { ret = -EINVAL; goto out; @@ -1615,11 +1732,11 @@ EXPORT_SYMBOL_GPL(clk_get_parent); * * For single-parent clocks without .get_parent, first check to see if the * .parents array exists, and if so use it to avoid an expensive tree - * traversal. If .parents does not exist then walk the tree with __clk_lookup. + * traversal. If .parents does not exist then walk the tree. */ -static struct clk *__clk_init_parent(struct clk *clk) +static struct clk_core *__clk_init_parent(struct clk_core *clk) { - struct clk *ret = NULL; + struct clk_core *ret = NULL; u8 index; /* handle the trivial cases */ @@ -1629,7 +1746,7 @@ static struct clk *__clk_init_parent(struct clk *clk) if (clk->num_parents == 1) { if (IS_ERR_OR_NULL(clk->parent)) - clk->parent = __clk_lookup(clk->parent_names[0]); + clk->parent = clk_core_lookup(clk->parent_names[0]); ret = clk->parent; goto out; } @@ -1643,8 +1760,8 @@ static struct clk *__clk_init_parent(struct clk *clk) /* * Do our best to cache parent clocks in clk->parents. This prevents - * unnecessary and expensive calls to __clk_lookup. We don't set - * clk->parent here; that is done by the calling function + * unnecessary and expensive lookups. We don't set clk->parent here; + * that is done by the calling function. */ index = clk->ops->get_parent(clk->hw); @@ -1654,13 +1771,14 @@ static struct clk *__clk_init_parent(struct clk *clk) kcalloc(clk->num_parents, sizeof(struct clk *), GFP_KERNEL); - ret = clk_get_parent_by_index(clk, index); + ret = clk_core_get_parent_by_index(clk, index); out: return ret; } -void __clk_reparent(struct clk *clk, struct clk *new_parent) +static void clk_core_reparent(struct clk_core *clk, + struct clk_core *new_parent) { clk_reparent(clk, new_parent); __clk_recalc_accuracies(clk); @@ -1679,42 +1797,29 @@ void __clk_reparent(struct clk *clk, struct clk *new_parent) */ bool clk_has_parent(struct clk *clk, struct clk *parent) { + struct clk_core *core, *parent_core; unsigned int i; /* NULL clocks should be nops, so return success if either is NULL. */ if (!clk || !parent) return true; + core = clk->core; + parent_core = parent->core; + /* Optimize for the case where the parent is already the parent. */ - if (clk->parent == parent) + if (core->parent == parent_core) return true; - for (i = 0; i < clk->num_parents; i++) - if (strcmp(clk->parent_names[i], parent->name) == 0) + for (i = 0; i < core->num_parents; i++) + if (strcmp(core->parent_names[i], parent_core->name) == 0) return true; return false; } EXPORT_SYMBOL_GPL(clk_has_parent); -/** - * clk_set_parent - switch the parent of a mux clk - * @clk: the mux clk whose input we are switching - * @parent: the new input to clk - * - * Re-parent clk to use parent as its new input source. If clk is in - * prepared state, the clk will get enabled for the duration of this call. If - * that's not acceptable for a specific clk (Eg: the consumer can't handle - * that, the reparenting is glitchy in hardware, etc), use the - * CLK_SET_PARENT_GATE flag to allow reparenting only when clk is unprepared. - * - * After successfully changing clk's parent clk_set_parent will update the - * clk topology, sysfs topology and propagate rate recalculation via - * __clk_recalc_rates. - * - * Returns 0 on success, -EERROR otherwise. - */ -int clk_set_parent(struct clk *clk, struct clk *parent) +static int clk_core_set_parent(struct clk_core *clk, struct clk_core *parent) { int ret = 0; int p_index = 0; @@ -1774,6 +1879,31 @@ out: return ret; } + +/** + * clk_set_parent - switch the parent of a mux clk + * @clk: the mux clk whose input we are switching + * @parent: the new input to clk + * + * Re-parent clk to use parent as its new input source. If clk is in + * prepared state, the clk will get enabled for the duration of this call. If + * that's not acceptable for a specific clk (Eg: the consumer can't handle + * that, the reparenting is glitchy in hardware, etc), use the + * CLK_SET_PARENT_GATE flag to allow reparenting only when clk is unprepared. + * + * After successfully changing clk's parent clk_set_parent will update the + * clk topology, sysfs topology and propagate rate recalculation via + * __clk_recalc_rates. + * + * Returns 0 on success, -EERROR otherwise. + */ +int clk_set_parent(struct clk *clk, struct clk *parent) +{ + if (!clk) + return 0; + + return clk_core_set_parent(clk->core, parent ? parent->core : NULL); +} EXPORT_SYMBOL_GPL(clk_set_parent); /** @@ -1810,13 +1940,13 @@ int clk_set_phase(struct clk *clk, int degrees) clk_prepare_lock(); - if (!clk->ops->set_phase) + if (!clk->core->ops->set_phase) goto out_unlock; - ret = clk->ops->set_phase(clk->hw, degrees); + ret = clk->core->ops->set_phase(clk->core->hw, degrees); if (!ret) - clk->phase = degrees; + clk->core->phase = degrees; out_unlock: clk_prepare_unlock(); @@ -1826,14 +1956,7 @@ out: } EXPORT_SYMBOL_GPL(clk_set_phase); -/** - * clk_get_phase - return the phase shift of a clock signal - * @clk: clock signal source - * - * Returns the phase shift of a clock node in degrees, otherwise returns - * -EERROR. - */ -int clk_get_phase(struct clk *clk) +static int clk_core_get_phase(struct clk_core *clk) { int ret = 0; @@ -1850,26 +1973,44 @@ out: EXPORT_SYMBOL_GPL(clk_get_phase); /** + * clk_get_phase - return the phase shift of a clock signal + * @clk: clock signal source + * + * Returns the phase shift of a clock node in degrees, otherwise returns + * -EERROR. + */ +int clk_get_phase(struct clk *clk) +{ + if (!clk) + return 0; + + return clk_core_get_phase(clk->core); +} + +/** * __clk_init - initialize the data structures in a struct clk * @dev: device initializing this clk, placeholder for now * @clk: clk being initialized * - * Initializes the lists in struct clk, queries the hardware for the + * Initializes the lists in struct clk_core, queries the hardware for the * parent and rate and sets them both. */ -int __clk_init(struct device *dev, struct clk *clk) +int __clk_init(struct device *dev, struct clk *clk_user) { int i, ret = 0; - struct clk *orphan; + struct clk_core *orphan; struct hlist_node *tmp2; + struct clk_core *clk; - if (!clk) + if (!clk_user) return -EINVAL; + clk = clk_user->core; + clk_prepare_lock(); /* check to see if a clock with this name is already registered */ - if (__clk_lookup(clk->name)) { + if (clk_core_lookup(clk->name)) { pr_debug("%s: clk %s already initialized\n", __func__, clk->name); ret = -EEXIST; @@ -1921,7 +2062,7 @@ int __clk_init(struct device *dev, struct clk *clk) clk->parents = kcalloc(clk->num_parents, sizeof(struct clk *), GFP_KERNEL); /* - * __clk_lookup returns NULL for parents that have not been + * clk_core_lookup returns NULL for parents that have not been * clk_init'd; thus any access to clk->parents[] must check * for a NULL pointer. We can always perform lazy lookups for * missing parents later on. @@ -1929,7 +2070,7 @@ int __clk_init(struct device *dev, struct clk *clk) if (clk->parents) for (i = 0; i < clk->num_parents; i++) clk->parents[i] = - __clk_lookup(clk->parent_names[i]); + clk_core_lookup(clk->parent_names[i]); } clk->parent = __clk_init_parent(clk); @@ -1985,7 +2126,7 @@ int __clk_init(struct device *dev, struct clk *clk) */ if (clk->ops->recalc_rate) clk->rate = clk->ops->recalc_rate(clk->hw, - __clk_get_rate(clk->parent)); + clk_core_get_rate_nolock(clk->parent)); else if (clk->parent) clk->rate = clk->parent->rate; else @@ -1999,13 +2140,13 @@ int __clk_init(struct device *dev, struct clk *clk) if (orphan->num_parents && orphan->ops->get_parent) { i = orphan->ops->get_parent(orphan->hw); if (!strcmp(clk->name, orphan->parent_names[i])) - __clk_reparent(orphan, clk); + clk_core_reparent(orphan, clk); continue; } for (i = 0; i < orphan->num_parents; i++) if (!strcmp(clk->name, orphan->parent_names[i])) { - __clk_reparent(orphan, clk); + clk_core_reparent(orphan, clk); break; } } @@ -2031,6 +2172,26 @@ out: return ret; } +struct clk *__clk_create_clk(struct clk_hw *hw, const char *dev_id, + const char *con_id) +{ + struct clk *clk; + + /* This is to allow this function to be chained to others */ + if (!hw || IS_ERR(hw)) + return (struct clk *) hw; + + clk = kzalloc(sizeof(*clk), GFP_KERNEL); + if (!clk) + return ERR_PTR(-ENOMEM); + + clk->core = hw->core; + clk->dev_id = dev_id; + clk->con_id = con_id; + + return clk; +} + /** * clk_register - allocate a new clock, register it and return an opaque cookie * @dev: device that is registering this clock @@ -2045,7 +2206,7 @@ out: struct clk *clk_register(struct device *dev, struct clk_hw *hw) { int i, ret; - struct clk *clk; + struct clk_core *clk; clk = kzalloc(sizeof(*clk), GFP_KERNEL); if (!clk) { @@ -2066,7 +2227,7 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw) clk->hw = hw; clk->flags = hw->init->flags; clk->num_parents = hw->init->num_parents; - hw->clk = clk; + hw->core = clk; /* allocate local copy in case parent_names is __initdata */ clk->parent_names = kcalloc(clk->num_parents, sizeof(char *), @@ -2090,10 +2251,19 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw) } } - ret = __clk_init(dev, clk); + hw->clk = __clk_create_clk(hw, NULL, NULL); + if (IS_ERR(hw->clk)) { + pr_err("%s: could not allocate per-user clk\n", __func__); + ret = PTR_ERR(hw->clk); + goto fail_parent_names_copy; + } + + ret = __clk_init(dev, hw->clk); if (!ret) - return clk; + return hw->clk; + kfree(hw->clk); + hw->clk = NULL; fail_parent_names_copy: while (--i >= 0) kfree(clk->parent_names[i]); @@ -2113,7 +2283,7 @@ EXPORT_SYMBOL_GPL(clk_register); */ static void __clk_release(struct kref *ref) { - struct clk *clk = container_of(ref, struct clk, ref); + struct clk_core *clk = container_of(ref, struct clk_core, ref); int i = clk->num_parents; kfree(clk->parents); @@ -2171,12 +2341,13 @@ void clk_unregister(struct clk *clk) if (!clk || WARN_ON_ONCE(IS_ERR(clk))) return; - clk_debug_unregister(clk); + clk_debug_unregister(clk->core); clk_prepare_lock(); - if (clk->ops == &clk_nodrv_ops) { - pr_err("%s: unregistered clock: %s\n", __func__, clk->name); + if (clk->core->ops == &clk_nodrv_ops) { + pr_err("%s: unregistered clock: %s\n", __func__, + clk->core->name); return; } /* @@ -2184,24 +2355,25 @@ void clk_unregister(struct clk *clk) * a reference to this clock. */ flags = clk_enable_lock(); - clk->ops = &clk_nodrv_ops; + clk->core->ops = &clk_nodrv_ops; clk_enable_unlock(flags); - if (!hlist_empty(&clk->children)) { - struct clk *child; + if (!hlist_empty(&clk->core->children)) { + struct clk_core *child; struct hlist_node *t; /* Reparent all children to the orphan list. */ - hlist_for_each_entry_safe(child, t, &clk->children, child_node) - clk_set_parent(child, NULL); + hlist_for_each_entry_safe(child, t, &clk->core->children, + child_node) + clk_core_set_parent(child, NULL); } - hlist_del_init(&clk->child_node); + hlist_del_init(&clk->core->child_node); - if (clk->prepare_count) + if (clk->core->prepare_count) pr_warn("%s: unregistering prepared clock: %s\n", - __func__, clk->name); - kref_put(&clk->ref, __clk_release); + __func__, clk->core->name); + kref_put(&clk->core->ref, __clk_release); clk_prepare_unlock(); } @@ -2269,30 +2441,39 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister); */ int __clk_get(struct clk *clk) { - if (clk) { - if (!try_module_get(clk->owner)) + struct clk_core *core = !clk ? NULL : clk->core; + + if (core) { + if (!try_module_get(core->owner)) return 0; - kref_get(&clk->ref); + kref_get(&core->ref); } return 1; } -void __clk_put(struct clk *clk) +static void clk_core_put(struct clk_core *core) { struct module *owner; - if (!clk || WARN_ON_ONCE(IS_ERR(clk))) - return; + owner = core->owner; clk_prepare_lock(); - owner = clk->owner; - kref_put(&clk->ref, __clk_release); + kref_put(&core->ref, __clk_release); clk_prepare_unlock(); module_put(owner); } +void __clk_put(struct clk *clk) +{ + if (!clk || WARN_ON_ONCE(IS_ERR(clk))) + return; + + clk_core_put(clk->core); + kfree(clk); +} + /*** clk rate change notifiers ***/ /** @@ -2345,7 +2526,7 @@ int clk_notifier_register(struct clk *clk, struct notifier_block *nb) ret = srcu_notifier_chain_register(&cn->notifier_head, nb); - clk->notifier_count++; + clk->core->notifier_count++; out: clk_prepare_unlock(); @@ -2382,7 +2563,7 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb) if (cn->clk == clk) { ret = srcu_notifier_chain_unregister(&cn->notifier_head, nb); - clk->notifier_count--; + clk->core->notifier_count--; /* XXX the notifier code should handle this better */ if (!cn->notifier_head.head) { |