From: Rajendra Nayak <rnayak@xxxxxx>
patch adds IO Daisychain support for OMAP4 as per section 3.9.4 in OMAP4430
Public TRM.
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
Signed-off-by: Vishwanath BS <vishwanath.bs@xxxxxx>
---
arch/arm/mach-omap2/prm44xx.c | 33 +++++++++++++++++++++++++++++++++
arch/arm/mach-omap2/prm44xx.h | 1 +
2 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index 0016555..7e19678 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -23,6 +23,8 @@
#include "prm44xx.h"
#include "prm-regbits-44xx.h"
+#include "prcm44xx.h"
+#include "prminst44xx.h"
/* PRM low-level functions */
@@ -50,3 +52,34 @@ u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
return v;
}
+
+/**
+ * Maximum time(us) it takes to output the signal WUCLKOUT of the last pad of
+ * the I/O ring after asserting WUCLKIN high
+ */
+#define MAX_IOPAD_LATCH_TIME 1000
+
+/* OMAP4 IO Daisychain trigger sequence */
+void omap4_trigger_wuclk_ctrl(void)
+{
+ int i = 0;
+
+ /* Enable GLOBAL_WUEN */
+ if (!(omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, OMAP4_PRM_IO_PMCTRL_OFFSET)
+ & OMAP4430_GLOBAL_WUEN_MASK))
+ omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
+ OMAP4430_GLOBAL_WUEN_MASK, OMAP4430_PRM_DEVICE_INST,
+ OMAP4_PRM_IO_PMCTRL_OFFSET);
+
+ /* Trigger WUCLKIN enable */
+ omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, OMAP4430_WUCLK_CTRL_MASK,
+ OMAP4430_PRM_DEVICE_INST, OMAP4_PRM_IO_PMCTRL_OFFSET);
+ omap_test_timeout(
+ ((omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, OMAP4_PRM_IO_PMCTRL_OFFSET)
+ >> OMAP4430_WUCLK_STATUS_SHIFT) == 1), MAX_IOPAD_LATCH_TIME, i);
+ /* Trigger WUCLKIN disable */
+ omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK, 0x0,
+ OMAP4430_PRM_DEVICE_INST, OMAP4_PRM_IO_PMCTRL_OFFSET);
+ return;
+}
+
diff --git a/arch/arm/mach-omap2/prm44xx.h b/arch/arm/mach-omap2/prm44xx.h
index 7dfa379..275b25a 100644
--- a/arch/arm/mach-omap2/prm44xx.h
+++ b/arch/arm/mach-omap2/prm44xx.h
@@ -750,6 +750,7 @@
extern u32 omap4_prm_read_inst_reg(s16 inst, u16 idx);
extern void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 idx);
extern u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx);
+extern void omap4_trigger_wuclk_ctrl(void);
# endif
--
1.7.0.4
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