[PATCH 3/8] OMAP2/3 PM: Adding powerdomain APIs for reading the next logic and mem state

[Thara Gopinath <thara@xxxxxx>]

This patch adds APIs pwrdm_read_next_logic_pwrst and
pwrdm_read_next_mem_pwrst for reading the next programmed
logic and memory state a powerdomain is to hit in event
of the next power domain state being retention.

Signed-off-by: Thara Gopinath <thara@xxxxxx>
---
 arch/arm/mach-omap2/powerdomain.c             |   71 +++++++++++++++++++++++++
 arch/arm/plat-omap/include/plat/powerdomain.h |    2 +
 2 files changed, 73 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 26b3f3e..06bf290 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -964,6 +964,29 @@ int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
 }
 
 /**
+ * pwrdm_read_next_logic_pwrst - get next powerdomain logic power state
+ * @pwrdm: struct powerdomain * to get next logic power state
+ *
+ * Return the powerdomain pwrdm's logic power state.  Returns -EINVAL
+ * if the powerdomain pointer is null or returns the next logic
+ * power state upon success.
+ */
+int pwrdm_read_next_logic_pwrst(struct powerdomain *pwrdm)
+{
+	if (!pwrdm)
+		return -EINVAL;
+
+	/*
+	 * The register bit names below may not correspond to the
+	 * actual names of the bits in each powerdomain's register,
+	 * but the type of value returned is the same for each
+	 * powerdomain.
+	 */
+	return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTCTRL,
+					OMAP3430_LOGICSTATEST);
+}
+
+/**
  * pwrdm_read_mem_pwrst - get current memory bank power state
  * @pwrdm: struct powerdomain * to get current memory bank power state
  * @bank: memory bank number (0-3)
@@ -1065,6 +1088,54 @@ int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
 }
 
 /**
+ * pwrdm_read_next_mem_pwrst - get next memory bank power state
+ * @pwrdm: struct powerdomain * to get mext memory bank power state
+ * @bank: memory bank number (0-3)
+ *
+ * Return the powerdomain pwrdm's next memory power state for bank
+ * x.  Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
+ * the target memory bank does not exist or is not controllable, or
+ * returns the next memory power state upon success.
+ */
+int pwrdm_read_next_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+	u32 m;
+
+	if (!pwrdm)
+		return -EINVAL;
+
+	if (pwrdm->banks < (bank + 1))
+		return -EEXIST;
+
+	/*
+	 * The register bit names below may not correspond to the
+	 * actual names of the bits in each powerdomain's register,
+	 * but the type of value returned is the same for each
+	 * powerdomain.
+	 */
+	switch (bank) {
+	case 0:
+		m = OMAP3430_SHAREDL1CACHEFLATRETSTATE;
+		break;
+	case 1:
+		m = OMAP3430_L1FLATMEMRETSTATE;
+		break;
+	case 2:
+		m = OMAP3430_SHAREDL2CACHEFLATRETSTATE;
+		break;
+	case 3:
+		m = OMAP3430_SHAREDL2CACHEFLATRETSTATE;
+		break;
+	default:
+		WARN_ON(1); /* should never happen */
+		return -EEXIST;
+	}
+
+	return prm_read_mod_bits_shift(pwrdm->prcm_offs,
+					PM_PWSTCTRL, m);
+}
+
+/**
  * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
  * @pwrdm: struct powerdomain * to clear
  *
diff --git a/arch/arm/plat-omap/include/plat/powerdomain.h b/arch/arm/plat-omap/include/plat/powerdomain.h
index 0b96005..7576559 100644
--- a/arch/arm/plat-omap/include/plat/powerdomain.h
+++ b/arch/arm/plat-omap/include/plat/powerdomain.h
@@ -170,8 +170,10 @@ int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
 
 int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm);
 int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm);
+int pwrdm_read_next_logic_pwrst(struct powerdomain *pwrdm);
 int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
 int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
+int pwrdm_read_next_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
 
 int pwrdm_enable_hdwr_sar(struct powerdomain *pwrdm);
 int pwrdm_disable_hdwr_sar(struct powerdomain *pwrdm);
-- 
1.5.6.3

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