34  *    controller but only work PIO with no IRQ.
48  *  flaw that it has a single set of PIO/MWDMA timings per channel so
81 	u16	pio[2];			/* Cached PIO values */  member
104  *	it821x_program	-	program the PIO/MWDMA registers
108  *	Program the PIO/MWDMA timing for this channel according to the
120 	/* Program PIO/MWDMA timing bits */  in it821x_program()
213 	 *	Reprogram the UDMA/PIO of the pair drive for the switch  in it821x_clock_strategy()
218 		it821x_program(pair, itdev->pio[1-unit]);  in it821x_clock_strategy()
221 	 *	Reprogram the UDMA/PIO of our drive for the switch.  in it821x_clock_strategy()
226 		it821x_program(drive, itdev->pio[unit]);  in it821x_clock_strategy()
231  *	it821x_set_pio_mode	-	set host controller for PIO mode
235  *	Tune the host to the desired PIO mode taking into the consideration
236  *	the maximum PIO mode supported by the other device on the cable.
243 	const u8 pio = drive->pio_mode - XFER_PIO_0;  in it821x_set_pio_mode()  local
244 	u8 unit = drive->dn & 1, set_pio = pio;  in it821x_set_pio_mode()
251 	 * Compute the best PIO mode we can for a given device. We must  in it821x_set_pio_mode()
257 		/* trim PIO to the slowest of the master/slave */  in it821x_set_pio_mode()
262 	/* We prefer 66Mhz clock for PIO 0-3, don't care for PIO4 */  in it821x_set_pio_mode()
264 	itdev->want[unit][0] = 1;	/* PIO is lowest priority */  in it821x_set_pio_mode()
265 	itdev->pio[unit] = pio_timings[set_pio];  in it821x_set_pio_mode()
267 	it821x_program(drive, itdev->pio[unit]);  in it821x_set_pio_mode()
277  *	must manage the whole lack of per device MWDMA/PIO timings and
278  *	the shared MWDMA/PIO timing register.
352  *	The IT821x has a single timing register for MWDMA and for PIO
378  *	The IT821x has a single timing register for MWDMA and for PIO
391 		it821x_program(drive, itdev->pio[unit]);  in it821x_dma_end()
408 	 * MWDMA tuning is really hard because our MWDMA and PIO  in it821x_set_dma_mode()
451 		 *	IRQ mask as we may well be in PIO (eg rev 0x10)  in it821x_quirkproc()
573 		/* MWDMA/PIO clock switching for pass through mode */  in init_hwif_it821x()
626 	/* it821x_set_{pio,dma}_mode() are only used in pass-through mode */