BUTTRESS_REG_TSC_HI
tsc_hi_1 = readl(isp->base + BUTTRESS_REG_TSC_HI);
tsc_hi_2 = readl(isp->base + BUTTRESS_REG_TSC_HI);
tsc_hi = readl(isp->base + BUTTRESS_REG_TSC_HI);