[PATCH 2/7] ARM: omap: add ABB PRM_IRQSTATUS handlers

[Mike Turquette]

Some PRM_IRQSTATUS registers contain a bit to signal that an ABB LDO
transition has completed.  These tranxdone bits exist for every instance
of an ABB LDO; thus these tranxdone bits are supported on 36xx variants
for the MPU voltage domain, and on 44xx variants for the MPU and IVA
voltage domains.

This patch introduces some data structures and helper functions for
checking on and clearing the TRANXDONE bits.  They are a copy-paste of
existing VP functions of similar nature and will be used in forthcoming
patches that control the ABB programming sequence during a DVFS
transition.

Some previous discussion on the design of the ABB PRM handlers can be
found here:
http://article.gmane.org/gmane.linux.ports.arm.omap/63609

Signed-off-by: Mike Turquette <mturquette at ti.com>
Signed-off-by: Mike Turquette <mturquette at linaro.org>
---
 arch/arm/mach-omap2/prm2xxx_3xxx.c |   36 +++++++++++++++++++++++++++++
 arch/arm/mach-omap2/prm2xxx_3xxx.h |    4 ++++
 arch/arm/mach-omap2/prm44xx.c      |   44 ++++++++++++++++++++++++++++++++++++
 arch/arm/mach-omap2/prm44xx.h      |    4 ++++
 4 files changed, 88 insertions(+)

diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.c b/arch/arm/mach-omap2/prm2xxx_3xxx.c
index a0309de..8d3c63f 100644
--- a/arch/arm/mach-omap2/prm2xxx_3xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx_3xxx.c
@@ -364,3 +364,39 @@ static int __init omap3xxx_prcm_init(void)
 	return ret;
 }
 subsys_initcall(omap3xxx_prcm_init);
+
+/* PRM ABB */
+
+/*
+ * struct omap36xx_abb - OMAP3 ABB register access description
+ * @tranxdone_status: ABB_xxx_DONE_ST bitmask in PRM_IRQSTATUS reg
+ */
+struct omap36xx_abb {
+	u32 tranxdone_status;
+};
+
+static struct omap36xx_abb omap36xx_abb[] = {
+	[OMAP3_VP_VDD_MPU_ID] = {
+		.tranxdone_status = OMAP3630_ABB_LDO_TRANXDONE_ST_MASK,
+	},
+};
+
+#define MAX_ABB_ID ARRAY_SIZE(omap36xx_abb);
+
+u32 omap3_prm_abb_check_txdone(u8 abb_id)
+{
+	struct omap36xx_abb *abb = &omap36xx_abb[abb_id];
+	u32 irqstatus;
+
+	irqstatus = omap2_prm_read_mod_reg(OCP_MOD,
+					   OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+	return irqstatus & abb->tranxdone_status;
+}
+
+void omap3_prm_abb_clear_txdone(u8 abb_id)
+{
+	struct omap36xx_abb *abb = &omap36xx_abb[abb_id];
+
+	omap2_prm_write_mod_reg(abb->tranxdone_status,
+				OCP_MOD, OMAP3_PRM_IRQSTATUS_MPU_OFFSET);
+}
diff --git a/arch/arm/mach-omap2/prm2xxx_3xxx.h b/arch/arm/mach-omap2/prm2xxx_3xxx.h
index c9eea9a..c24c039 100644
--- a/arch/arm/mach-omap2/prm2xxx_3xxx.h
+++ b/arch/arm/mach-omap2/prm2xxx_3xxx.h
@@ -249,6 +249,10 @@ extern int omap2_prm_deassert_hardreset(s16 prm_mod, u8 rst_shift, u8 st_shift);
 u32 omap3_prm_vp_check_txdone(u8 vp_id);
 void omap3_prm_vp_clear_txdone(u8 vp_id);
 
+/* OMAP36xx-specific ABB functions */
+u32 omap3_prm_abb_check_txdone(u8 vp_id);
+void omap3_prm_abb_clear_txdone(u8 vp_id);
+
 /*
  * OMAP3 access functions for voltage controller (VC) and
  * voltage proccessor (VP) in the PRM.
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index bb727c2..9b820d4 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -301,3 +301,47 @@ static int __init omap4xxx_prcm_init(void)
 	return 0;
 }
 subsys_initcall(omap4xxx_prcm_init);
+
+/* PRM ABB */
+
+/*
+ * struct omap4_vp - OMAP4 VP register access description.
+ * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
+ * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
+ */
+struct omap4_abb {
+	u32 irqstatus_mpu;
+	u32 tranxdone_status;
+};
+
+static struct omap4_abb omap4_abb[] = {
+	[OMAP4_VP_VDD_MPU_ID] = {
+		.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
+		.tranxdone_status = OMAP4430_ABB_MPU_DONE_ST_MASK,
+	},
+	[OMAP4_VP_VDD_IVA_ID] = {
+		.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
+		.tranxdone_status = OMAP4430_ABB_IVA_DONE_ST_MASK,
+	},
+};
+
+u32 omap4_prm_abb_check_txdone(u8 abb_id)
+{
+	struct omap4_abb *abb = &omap4_abb[abb_id];
+	u32 irqstatus;
+
+	irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
+						OMAP4430_PRM_OCP_SOCKET_INST,
+						abb->irqstatus_mpu);
+	return irqstatus & abb->tranxdone_status;
+}
+
+void omap4_prm_abb_clear_txdone(u8 abb_id)
+{
+	struct omap4_abb *abb = &omap4_abb[abb_id];
+
+	omap4_prminst_write_inst_reg(abb->tranxdone_status,
+				     OMAP4430_PRM_PARTITION,
+				     OMAP4430_PRM_OCP_SOCKET_INST,
+				     abb->irqstatus_mpu);
+};
diff --git a/arch/arm/mach-omap2/prm44xx.h b/arch/arm/mach-omap2/prm44xx.h
index ee72ae6..6a0a00c 100644
--- a/arch/arm/mach-omap2/prm44xx.h
+++ b/arch/arm/mach-omap2/prm44xx.h
@@ -755,6 +755,10 @@ extern u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx);
 u32 omap4_prm_vp_check_txdone(u8 vp_id);
 void omap4_prm_vp_clear_txdone(u8 vp_id);
 
+/* OMAP4-specific ABB functions */
+u32 omap4_prm_abb_check_txdone(u8 abb_id);
+void omap4_prm_abb_clear_txdone(u8 abb_id);
+
 /*
  * OMAP4 access functions for voltage controller (VC) and
  * voltage proccessor (VP) in the PRM.
-- 
1.7.9.5