OMAP4: clockdomain: Add wkup/sleep dependency support

Add OMAP4 platform specific implementation to support clkdm
wkup and sleep dependencies a.k.a static dependencies.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: removed comment about PRM; zero-prefixed STATICDEP
 register offset; fixed loop termination condition in
 omap4_clkdm_clear_all_wkup_sleep_deps(); thanks to Kevin Hilman for finding
 and helping fix this bug]
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clockdomain44xx.c b/arch/arm/mach-omap2/clockdomain44xx.c
index c0ccc4701646..a1a4ecd26544 100644
--- a/arch/arm/mach-omap2/clockdomain44xx.c
+++ b/arch/arm/mach-omap2/clockdomain44xx.c
@@ -12,8 +12,60 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/kernel.h>
 #include "clockdomain.h"
 #include "cminst44xx.h"
+#include "cm44xx.h"
+
+static int omap4_clkdm_add_wkup_sleep_dep(struct clockdomain *clkdm1,
+                                        struct clockdomain *clkdm2)
+{
+        omap4_cminst_set_inst_reg_bits((1 << clkdm2->dep_bit),
+                                        clkdm1->prcm_partition,
+                                        clkdm1->cm_inst, clkdm1->clkdm_offs +
+                                        OMAP4_CM_STATICDEP);
+        return 0;
+}
+
+static int omap4_clkdm_del_wkup_sleep_dep(struct clockdomain *clkdm1,
+                                        struct clockdomain *clkdm2)
+{
+        omap4_cminst_clear_inst_reg_bits((1 << clkdm2->dep_bit),
+                                        clkdm1->prcm_partition,
+                                        clkdm1->cm_inst, clkdm1->clkdm_offs +
+                                        OMAP4_CM_STATICDEP);
+        return 0;
+}
+
+static int omap4_clkdm_read_wkup_sleep_dep(struct clockdomain *clkdm1,
+                                        struct clockdomain *clkdm2)
+{
+        return omap4_cminst_read_inst_reg_bits(clkdm1->prcm_partition,
+                                        clkdm1->cm_inst, clkdm1->clkdm_offs +
+                                        OMAP4_CM_STATICDEP,
+                                        (1 << clkdm2->dep_bit));
+}
+
+static int omap4_clkdm_clear_all_wkup_sleep_deps(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 */
+
+                mask |= 1 << cd->clkdm->dep_bit;
+                atomic_set(&cd->wkdep_usecount, 0);
+        }
+
+        omap4_cminst_clear_inst_reg_bits(mask, clkdm->prcm_partition,
+                                        clkdm->cm_inst, clkdm->clkdm_offs +
+                                        OMAP4_CM_STATICDEP);
+        return 0;
+}
 
 static int omap4_clkdm_sleep(struct clockdomain *clkdm)
 {
@@ -68,6 +120,14 @@ static int omap4_clkdm_clk_disable(struct clockdomain *clkdm)
 }
 
 struct clkdm_ops omap4_clkdm_operations = {
+        .clkdm_add_wkdep        = omap4_clkdm_add_wkup_sleep_dep,
+        .clkdm_del_wkdep        = omap4_clkdm_del_wkup_sleep_dep,
+        .clkdm_read_wkdep       = omap4_clkdm_read_wkup_sleep_dep,
+        .clkdm_clear_all_wkdeps = omap4_clkdm_clear_all_wkup_sleep_deps,
+        .clkdm_add_sleepdep     = omap4_clkdm_add_wkup_sleep_dep,
+        .clkdm_del_sleepdep     = omap4_clkdm_del_wkup_sleep_dep,
+        .clkdm_read_sleepdep    = omap4_clkdm_read_wkup_sleep_dep,
+        .clkdm_clear_all_sleepdeps      = omap4_clkdm_clear_all_wkup_sleep_deps,
         .clkdm_sleep            = omap4_clkdm_sleep,
         .clkdm_wakeup           = omap4_clkdm_wakeup,
         .clkdm_allow_idle       = omap4_clkdm_allow_idle,