CONTROL_CLEAR
reg_write(ohci, CONTROL_CLEAR(ctx->regs), ~0);
reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);
if (reg_read(ohci, CONTROL_CLEAR(ctx->regs)) & CONTEXT_RUN) {
reg_write(ohci, CONTROL_CLEAR(ctx->regs), CONTEXT_RUN);