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authorPatrick McHardy <kaber@trash.net>2013-03-31 18:10:34 +0200
committerPatrick McHardy <kaber@trash.net>2013-03-31 18:10:34 +0200
commit70711d223510ba1773cfe1d7770a56141c815ff8 (patch)
tree4a71f38a3a554ddecaa31b7d8c6bc49b7d1705b4 /arch/arm/mach-omap2/clockdomain.c
parentd53b4ed072d9779cdf53582c46436dec06d0961f (diff)
parent19f949f52599ba7c3f67a5897ac6be14bfcb1200 (diff)
Merge tag 'v3.8' of /home/kaber/src/repos/linux
Linux 3.8 Signed-off-by: Patrick McHardy <kaber@trash.net> Conflicts: include/linux/Kbuild include/linux/netlink.h
Diffstat (limited to 'arch/arm/mach-omap2/clockdomain.c')
-rw-r--r--arch/arm/mach-omap2/clockdomain.c185
1 files changed, 110 insertions, 75 deletions
diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c
index 8664f5a8bfb..7faf82d4e85 100644
--- a/arch/arm/mach-omap2/clockdomain.c
+++ b/arch/arm/mach-omap2/clockdomain.c
@@ -22,12 +22,14 @@
#include <linux/clk.h>
#include <linux/limits.h>
#include <linux/err.h>
+#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/bitops.h>
-#include <plat/clock.h>
+#include "soc.h"
+#include "clock.h"
#include "clockdomain.h"
/* clkdm_list contains all registered struct clockdomains */
@@ -174,9 +176,8 @@ void _clkdm_add_autodeps(struct clockdomain *clkdm)
if (IS_ERR(autodep->clkdm.ptr))
continue;
- pr_debug("clockdomain: adding %s sleepdep/wkdep for "
- "clkdm %s\n", autodep->clkdm.ptr->name,
- clkdm->name);
+ pr_debug("clockdomain: %s: adding %s sleepdep/wkdep\n",
+ clkdm->name, autodep->clkdm.ptr->name);
clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr);
clkdm_add_wkdep(clkdm, autodep->clkdm.ptr);
@@ -205,9 +206,8 @@ void _clkdm_del_autodeps(struct clockdomain *clkdm)
if (IS_ERR(autodep->clkdm.ptr))
continue;
- pr_debug("clockdomain: removing %s sleepdep/wkdep for "
- "clkdm %s\n", autodep->clkdm.ptr->name,
- clkdm->name);
+ pr_debug("clockdomain: %s: removing %s sleepdep/wkdep\n",
+ clkdm->name, autodep->clkdm.ptr->name);
clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr);
clkdm_del_wkdep(clkdm, autodep->clkdm.ptr);
@@ -469,14 +469,14 @@ int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
ret = -EINVAL;
if (ret) {
- pr_debug("clockdomain: hardware cannot set/clear wake up of "
- "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
+ clkdm1->name, clkdm2->name);
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);
+ pr_debug("clockdomain: hardware will wake up %s when %s wakes up\n",
+ clkdm1->name, clkdm2->name);
ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2);
}
@@ -510,14 +510,14 @@ int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
ret = -EINVAL;
if (ret) {
- pr_debug("clockdomain: hardware cannot set/clear wake up of "
- "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
+ clkdm1->name, clkdm2->name);
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);
+ pr_debug("clockdomain: hardware will no longer wake up %s after %s wakes up\n",
+ clkdm1->name, clkdm2->name);
ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2);
}
@@ -555,8 +555,8 @@ int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
ret = -EINVAL;
if (ret) {
- pr_debug("clockdomain: hardware cannot set/clear wake up of "
- "%s when %s wakes up\n", clkdm1->name, clkdm2->name);
+ pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n",
+ clkdm1->name, clkdm2->name);
return ret;
}
@@ -613,15 +613,14 @@ int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
ret = -EINVAL;
if (ret) {
- pr_debug("clockdomain: hardware cannot set/clear sleep "
- "dependency affecting %s from %s\n", clkdm1->name,
- clkdm2->name);
+ pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
+ clkdm1->name, clkdm2->name);
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);
+ pr_debug("clockdomain: will prevent %s from sleeping if %s is active\n",
+ clkdm1->name, clkdm2->name);
ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2);
}
@@ -657,16 +656,14 @@ int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
ret = -EINVAL;
if (ret) {
- pr_debug("clockdomain: hardware cannot set/clear sleep "
- "dependency affecting %s from %s\n", clkdm1->name,
- clkdm2->name);
+ pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
+ clkdm1->name, clkdm2->name);
return ret;
}
if (atomic_dec_return(&cd->sleepdep_usecount) == 0) {
- pr_debug("clockdomain: will no longer prevent %s from "
- "sleeping if %s is active\n", clkdm1->name,
- clkdm2->name);
+ pr_debug("clockdomain: will no longer prevent %s from sleeping if %s is active\n",
+ clkdm1->name, clkdm2->name);
ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2);
}
@@ -706,9 +703,8 @@ int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2)
ret = -EINVAL;
if (ret) {
- pr_debug("clockdomain: hardware cannot set/clear sleep "
- "dependency affecting %s from %s\n", clkdm1->name,
- clkdm2->name);
+ pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n",
+ clkdm1->name, clkdm2->name);
return ret;
}
@@ -755,8 +751,8 @@ int clkdm_sleep(struct clockdomain *clkdm)
return -EINVAL;
if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) {
- pr_debug("clockdomain: %s does not support forcing "
- "sleep via software\n", clkdm->name);
+ pr_debug("clockdomain: %s does not support forcing sleep via software\n",
+ clkdm->name);
return -EINVAL;
}
@@ -790,8 +786,8 @@ int clkdm_wakeup(struct clockdomain *clkdm)
return -EINVAL;
if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) {
- pr_debug("clockdomain: %s does not support forcing "
- "wakeup via software\n", clkdm->name);
+ pr_debug("clockdomain: %s does not support forcing wakeup via software\n",
+ clkdm->name);
return -EINVAL;
}
@@ -826,8 +822,8 @@ void clkdm_allow_idle(struct clockdomain *clkdm)
return;
if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) {
- pr_debug("clock: automatic idle transitions cannot be enabled "
- "on clockdomain %s\n", clkdm->name);
+ pr_debug("clock: %s: automatic idle transitions cannot be enabled\n",
+ clkdm->name);
return;
}
@@ -861,8 +857,8 @@ void clkdm_deny_idle(struct clockdomain *clkdm)
return;
if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) {
- pr_debug("clockdomain: automatic idle transitions cannot be "
- "disabled on %s\n", clkdm->name);
+ pr_debug("clockdomain: %s: automatic idle transitions cannot be disabled\n",
+ clkdm->name);
return;
}
@@ -905,6 +901,23 @@ bool clkdm_in_hwsup(struct clockdomain *clkdm)
return ret;
}
+/**
+ * clkdm_missing_idle_reporting - can @clkdm enter autoidle even if in use?
+ * @clkdm: struct clockdomain *
+ *
+ * Returns true if clockdomain @clkdm has the
+ * CLKDM_MISSING_IDLE_REPORTING flag set, or false if not or @clkdm is
+ * null. More information is available in the documentation for the
+ * CLKDM_MISSING_IDLE_REPORTING macro.
+ */
+bool clkdm_missing_idle_reporting(struct clockdomain *clkdm)
+{
+ if (!clkdm)
+ return false;
+
+ return (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) ? true : false;
+}
+
/* Clockdomain-to-clock/hwmod framework interface code */
static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm)
@@ -914,45 +927,23 @@ static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm)
if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable)
return -EINVAL;
+ spin_lock_irqsave(&clkdm->lock, flags);
+
/*
* For arch's with no autodeps, clkcm_clk_enable
* should be called for every clock instance or hwmod that is
* enabled, so the clkdm can be force woken up.
*/
- if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps)
+ if ((atomic_inc_return(&clkdm->usecount) > 1) && autodeps) {
+ spin_unlock_irqrestore(&clkdm->lock, flags);
return 0;
-
- spin_lock_irqsave(&clkdm->lock, flags);
- arch_clkdm->clkdm_clk_enable(clkdm);
- pwrdm_state_switch(clkdm->pwrdm.ptr);
- spin_unlock_irqrestore(&clkdm->lock, flags);
-
- pr_debug("clockdomain: clkdm %s: enabled\n", clkdm->name);
-
- return 0;
-}
-
-static int _clkdm_clk_hwmod_disable(struct clockdomain *clkdm)
-{
- unsigned long flags;
-
- if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_disable)
- return -EINVAL;
-
- if (atomic_read(&clkdm->usecount) == 0) {
- WARN_ON(1); /* underflow */
- return -ERANGE;
}
- if (atomic_dec_return(&clkdm->usecount) > 0)
- return 0;
-
- spin_lock_irqsave(&clkdm->lock, flags);
- arch_clkdm->clkdm_clk_disable(clkdm);
+ arch_clkdm->clkdm_clk_enable(clkdm);
pwrdm_state_switch(clkdm->pwrdm.ptr);
spin_unlock_irqrestore(&clkdm->lock, flags);
- pr_debug("clockdomain: clkdm %s: disabled\n", clkdm->name);
+ pr_debug("clockdomain: %s: enabled\n", clkdm->name);
return 0;
}
@@ -999,15 +990,38 @@ int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
*/
int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
{
- /*
- * XXX Rewrite this code to maintain a list of enabled
- * downstream clocks for debugging purposes?
- */
+ unsigned long flags;
- if (!clk)
+ if (!clkdm || !clk || !arch_clkdm || !arch_clkdm->clkdm_clk_disable)
return -EINVAL;
- return _clkdm_clk_hwmod_disable(clkdm);
+ spin_lock_irqsave(&clkdm->lock, flags);
+
+ /* corner case: disabling unused clocks */
+ if ((__clk_get_enable_count(clk) == 0) &&
+ (atomic_read(&clkdm->usecount) == 0))
+ goto ccd_exit;
+
+ if (atomic_read(&clkdm->usecount) == 0) {
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+ WARN_ON(1); /* underflow */
+ return -ERANGE;
+ }
+
+ if (atomic_dec_return(&clkdm->usecount) > 0) {
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+ return 0;
+ }
+
+ arch_clkdm->clkdm_clk_disable(clkdm);
+ pwrdm_state_switch(clkdm->pwrdm.ptr);
+
+ pr_debug("clockdomain: %s: disabled\n", clkdm->name);
+
+ccd_exit:
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+
+ return 0;
}
/**
@@ -1058,6 +1072,8 @@ int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh)
*/
int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh)
{
+ unsigned long flags;
+
/* The clkdm attribute does not exist yet prior OMAP4 */
if (cpu_is_omap24xx() || cpu_is_omap34xx())
return 0;
@@ -1067,9 +1083,28 @@ int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh)
* downstream hwmods for debugging purposes?
*/
- if (!oh)
+ if (!clkdm || !oh || !arch_clkdm || !arch_clkdm->clkdm_clk_disable)
return -EINVAL;
- return _clkdm_clk_hwmod_disable(clkdm);
+ spin_lock_irqsave(&clkdm->lock, flags);
+
+ if (atomic_read(&clkdm->usecount) == 0) {
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+ WARN_ON(1); /* underflow */
+ return -ERANGE;
+ }
+
+ if (atomic_dec_return(&clkdm->usecount) > 0) {
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+ return 0;
+ }
+
+ arch_clkdm->clkdm_clk_disable(clkdm);
+ pwrdm_state_switch(clkdm->pwrdm.ptr);
+ spin_unlock_irqrestore(&clkdm->lock, flags);
+
+ pr_debug("clockdomain: %s: disabled\n", clkdm->name);
+
+ return 0;
}