diff options
Diffstat (limited to 'include/linux/mfd/ti_am335x_tscadc.h')
| -rw-r--r-- | include/linux/mfd/ti_am335x_tscadc.h | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index 25f2c611ab01..d498d98f0c2c 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/include/linux/mfd/ti_am335x_tscadc.h @@ -46,16 +46,24 @@ /* Step Enable */ #define STEPENB_MASK (0x1FFFF << 0) #define STEPENB(val) ((val) << 0) +#define ENB(val) (1 << (val)) +#define STPENB_STEPENB STEPENB(0x1FFFF) +#define STPENB_STEPENB_TC STEPENB(0x1FFF) /* IRQ enable */ #define IRQENB_HW_PEN BIT(0) #define IRQENB_FIFO0THRES BIT(2) +#define IRQENB_FIFO0OVRRUN BIT(3) +#define IRQENB_FIFO0UNDRFLW BIT(4) #define IRQENB_FIFO1THRES BIT(5) +#define IRQENB_FIFO1OVRRUN BIT(6) +#define IRQENB_FIFO1UNDRFLW BIT(7) #define IRQENB_PENUP BIT(9) /* Step Configuration */ #define STEPCONFIG_MODE_MASK (3 << 0) #define STEPCONFIG_MODE(val) ((val) << 0) +#define STEPCONFIG_MODE_SWCNT STEPCONFIG_MODE(1) #define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2) #define STEPCONFIG_AVG_MASK (7 << 2) #define STEPCONFIG_AVG(val) ((val) << 2) @@ -123,15 +131,21 @@ #define ADC_CLK 3000000 #define TOTAL_STEPS 16 #define TOTAL_CHANNELS 8 +#define FIFO1_THRESHOLD 19 /* -* ADC runs at 3MHz, and it takes -* 15 cycles to latch one data output. -* Hence the idle time for ADC to -* process one sample data would be -* around 5 micro seconds. -*/ -#define IDLE_TIMEOUT 5 /* microsec */ + * time in us for processing a single channel, calculated as follows: + * + * num cycles = open delay + (sample delay + conv time) * averaging + * + * num cycles: 152 + (1 + 13) * 16 = 376 + * + * clock frequency: 26MHz / 8 = 3.25MHz + * clock period: 1 / 3.25MHz = 308ns + * + * processing time: 376 * 308ns = 116us + */ +#define IDLE_TIMEOUT 116 /* microsec */ #define TSCADC_CELLS 2 @@ -146,6 +160,7 @@ struct ti_tscadc_dev { struct mfd_cell cells[TSCADC_CELLS]; u32 reg_se_cache; spinlock_t reg_lock; + unsigned int clk_div; /* tsc device */ struct titsc *tsc; |