From: Rajendra Nayak <[email protected]> patch adds IO Daisychain support for OMAP4 as per section 3.9.4 in OMAP4430 Public TRM.
Signed-off-by: Rajendra Nayak <[email protected]> Signed-off-by: Vishwanath BS <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
