12  *  modes. In pass through mode then it is an IDE controller. In its smart
13  *  mode its actually quite a capable hardware raid controller disguised
14  *  as an IDE controller. Smart mode only understands DMA read/write and
16  *  in other respects but lacks the raid mode.
24  *  o	If you write LBA48 sized I/O's (ie > 256 sector) in smart mode
26  *  o	Smart mode without RAID doesn't clear all the necessary identify
30  *  - In pass through mode we do all the work you would expect
31  *  - In smart mode the clocking set up is done by the controller generally
33  *  - There are a few extra vendor commands that actually talk to the
36  *  Vendor areas of the identify block in smart mode are used for the
37  *  timing and policy set up. Each HDD in raid mode also has a serial
41  *  In Linux the driver supports pass through mode as if the device was
42  *  just another IDE controller. If the smart mode is running then
44  *  is a raid volume. Even more cute - the controller can do automated
52  *  matters in smart mode. ATAPI DMA is not currently supported.
54  *  It seems the smart mode is a win for RAID1/RAID10 but otherwise not.
57  *	-	ATAPI UDMA is ok but not MWDMA it seems
58  *	-	RAID configuration ioctls
59  *	-	Move to libata once it grows up
75 	unsigned int smart:1,		/* Are we in smart raid mode */
78 	u8	want[2][2];		/* Mode/Pri log for master slave */
83 	u16	udma[2];		/* Cached UDMA values (per drive) */
95  *	We allow users to force the card into non raid mode without
104  *	it821x_program	-	program the PIO/MWDMA registers
105  *	@drive: drive to tune
112 static void it821x_program(ide_drive_t *drive, u16 timing)  in it821x_program()  argument
114 	ide_hwif_t *hwif = drive->hwif;  in it821x_program()
115 	struct pci_dev *dev = to_pci_dev(hwif->dev);  in it821x_program()
117 	int channel = hwif->channel;  in it821x_program()
121 	if(itdev->clock_mode == ATA_66)  in it821x_program()
130  *	it821x_program_udma	-	program the UDMA registers
131  *	@drive: drive to tune
134  *	Program the UDMA timing for this drive according to the
138 static void it821x_program_udma(ide_drive_t *drive, u16 timing)  in it821x_program_udma()  argument
140 	ide_hwif_t *hwif = drive->hwif;  in it821x_program_udma()
141 	struct pci_dev *dev = to_pci_dev(hwif->dev);  in it821x_program_udma()
143 	int channel = hwif->channel;  in it821x_program_udma()
144 	u8 unit = drive->dn & 1, conf;  in it821x_program_udma()
147 	if(itdev->clock_mode == ATA_66)  in it821x_program_udma()
152 	if (itdev->timing10 == 0)  in it821x_program_udma()
162  *	@drive: drive to set up
168 static void it821x_clock_strategy(ide_drive_t *drive)  in it821x_clock_strategy()  argument
170 	ide_hwif_t *hwif = drive->hwif;  in it821x_clock_strategy()
171 	struct pci_dev *dev = to_pci_dev(hwif->dev);  in it821x_clock_strategy()
173 	ide_drive_t *pair = ide_get_pair_dev(drive);  in it821x_clock_strategy()
175 	u8 unit = drive->dn & 1, v;  in it821x_clock_strategy()
177 	if(itdev->want[0][0] > itdev->want[1][0]) {  in it821x_clock_strategy()
178 		clock = itdev->want[0][1];  in it821x_clock_strategy()
179 		altclock = itdev->want[1][1];  in it821x_clock_strategy()
181 		clock = itdev->want[1][1];  in it821x_clock_strategy()
182 		altclock = itdev->want[0][1];  in it821x_clock_strategy()
186 	 * if both clocks can be used for the mode with the higher priority  in it821x_clock_strategy()
187 	 * use the clock needed by the mode with the lower priority  in it821x_clock_strategy()
192 	/* Nobody cares - keep the same clock */  in it821x_clock_strategy()
196 	if(clock == itdev->clock_mode)  in it821x_clock_strategy()
201 		itdev->clock_mode = ATA_66;  in it821x_clock_strategy()
203 		itdev->clock_mode = ATA_50;  in it821x_clock_strategy()
208 	v &= ~(1 << (1 + hwif->channel));  in it821x_clock_strategy()
209 	v |= sel << (1 + hwif->channel);  in it821x_clock_strategy()
213 	 *	Reprogram the UDMA/PIO of the pair drive for the switch  in it821x_clock_strategy()
216 	if(pair && itdev->udma[1-unit] != UDMA_OFF) {  in it821x_clock_strategy()
217 		it821x_program_udma(pair, itdev->udma[1-unit]);  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()
224 	if(itdev->udma[unit] != UDMA_OFF) {  in it821x_clock_strategy()
225 		it821x_program_udma(drive, itdev->udma[unit]);  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
233  *	@drive: drive
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.
239 static void it821x_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)  in it821x_set_pio_mode()  argument
242 	ide_drive_t *pair = ide_get_pair_dev(drive);  in it821x_set_pio_mode()
243 	const u8 pio = drive->pio_mode - XFER_PIO_0;  in it821x_set_pio_mode()
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()
256 		u8 pair_pio = pair->pio_mode - XFER_PIO_0;  in it821x_set_pio_mode()
262 	/* We prefer 66Mhz clock for PIO 0-3, don't care for PIO4 */  in it821x_set_pio_mode()
263 	itdev->want[unit][1] = pio_want[set_pio];  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()
266 	it821x_clock_strategy(drive);  in it821x_set_pio_mode()
267 	it821x_program(drive, itdev->pio[unit]);  in it821x_set_pio_mode()
271  *	it821x_tune_mwdma	-	tune a channel for MWDMA
272  *	@drive: drive to set up
273  *	@mode_wanted: the target operating mode
275  *	Load the timing settings for this device mode into the
276  *	controller when doing MWDMA in pass through mode. The caller
281 static void it821x_tune_mwdma(ide_drive_t *drive, u8 mode_wanted)  in it821x_tune_mwdma()  argument
283 	ide_hwif_t *hwif = drive->hwif;  in it821x_tune_mwdma()
284 	struct pci_dev *dev = to_pci_dev(hwif->dev);  in it821x_tune_mwdma()
286 	u8 unit = drive->dn & 1, channel = hwif->channel, conf;  in it821x_tune_mwdma()
291 	itdev->want[unit][1] = mwdma_want[mode_wanted];  in it821x_tune_mwdma()
292 	itdev->want[unit][0] = 2;	/* MWDMA is low priority */  in it821x_tune_mwdma()
293 	itdev->mwdma[unit] = dma[mode_wanted];  in it821x_tune_mwdma()
294 	itdev->udma[unit] = UDMA_OFF;  in it821x_tune_mwdma()
296 	/* UDMA bits off - Revision 0x10 do them in pairs */  in it821x_tune_mwdma()
298 	if (itdev->timing10)  in it821x_tune_mwdma()
304 	it821x_clock_strategy(drive);  in it821x_tune_mwdma()
306 	/* it821x_program(drive, itdev->mwdma[unit]); */  in it821x_tune_mwdma()
310  *	it821x_tune_udma	-	tune a channel for UDMA
311  *	@drive: drive to set up
312  *	@mode_wanted: the target operating mode
314  *	Load the timing settings for this device mode into the
318 static void it821x_tune_udma(ide_drive_t *drive, u8 mode_wanted)  in it821x_tune_udma()  argument
320 	ide_hwif_t *hwif = drive->hwif;  in it821x_tune_udma()
321 	struct pci_dev *dev = to_pci_dev(hwif->dev);  in it821x_tune_udma()
323 	u8 unit = drive->dn & 1, channel = hwif->channel, conf;  in it821x_tune_udma()
328 	itdev->want[unit][1] = udma_want[mode_wanted];  in it821x_tune_udma()
329 	itdev->want[unit][0] = 3;	/* UDMA is high priority */  in it821x_tune_udma()
330 	itdev->mwdma[unit] = MWDMA_OFF;  in it821x_tune_udma()
331 	itdev->udma[unit] = udma[mode_wanted];  in it821x_tune_udma()
333 		itdev->udma[unit] |= 0x8080;	/* UDMA 5/6 select on */  in it821x_tune_udma()
337 	if (itdev->timing10)  in it821x_tune_udma()
343 	it821x_clock_strategy(drive);  in it821x_tune_udma()
344 	it821x_program_udma(drive, itdev->udma[unit]);  in it821x_tune_udma()
349  *	it821x_dma_read	-	DMA hook
350  *	@drive: drive for DMA
361 static void it821x_dma_start(ide_drive_t *drive)  in it821x_dma_start()  argument
363 	ide_hwif_t *hwif = drive->hwif;  in it821x_dma_start()
365 	u8 unit = drive->dn & 1;  in it821x_dma_start()
367 	if(itdev->mwdma[unit] != MWDMA_OFF)  in it821x_dma_start()
368 		it821x_program(drive, itdev->mwdma[unit]);  in it821x_dma_start()
369 	else if(itdev->udma[unit] != UDMA_OFF && itdev->timing10)  in it821x_dma_start()
370 		it821x_program_udma(drive, itdev->udma[unit]);  in it821x_dma_start()
371 	ide_dma_start(drive);  in it821x_dma_start()
375  *	it821x_dma_write	-	DMA hook
376  *	@drive: drive for DMA stop
383 static int it821x_dma_end(ide_drive_t *drive)  in it821x_dma_end()  argument
385 	ide_hwif_t *hwif = drive->hwif;  in it821x_dma_end()
387 	int ret = ide_dma_end(drive);  in it821x_dma_end()
388 	u8 unit = drive->dn & 1;  in it821x_dma_end()
390 	if(itdev->mwdma[unit] != MWDMA_OFF)  in it821x_dma_end()
391 		it821x_program(drive, itdev->pio[unit]);  in it821x_dma_end()
396  *	it821x_set_dma_mode	-	set host controller for DMA mode
398  *	@drive: drive
400  *	Tune the ITE chipset for the desired DMA mode.
403 static void it821x_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)  in it821x_set_dma_mode()  argument
405 	const u8 speed = drive->dma_mode;  in it821x_set_dma_mode()
413 		it821x_tune_udma(drive, speed - XFER_UDMA_0);  in it821x_set_dma_mode()
415 		it821x_tune_mwdma(drive, speed - XFER_MW_DMA_0);  in it821x_set_dma_mode()
419  *	it821x_cable_detect	-	cable detection
434  *	it821x_quirkproc	-	post init callback
435  *	@drive: drive
437  *	This callback is run after the drive has been probed but
442 static void it821x_quirkproc(ide_drive_t *drive)  in it821x_quirkproc()  argument
444 	struct it821x_dev *itdev = ide_get_hwifdata(drive->hwif);  in it821x_quirkproc()
445 	u16 *id = drive->id;  in it821x_quirkproc()
447 	if (!itdev->smart) {  in it821x_quirkproc()
449 		 *	If we are in pass through mode then not much  in it821x_quirkproc()
454 		drive->dev_flags |= IDE_DFLAG_UNMASK;  in it821x_quirkproc()
457 	 *	Perform fixups on smart mode. We need to "lose" some  in it821x_quirkproc()
460 	 *	in RAID mode.  in it821x_quirkproc()
466 			/* In raid mode the ident block is slightly buggy  in it821x_quirkproc()
474 				drive->name, id[147] ? "Bootable " : "",  in it821x_quirkproc()
495 				drive->name);  in it821x_quirkproc()
499 		 * Set MWDMA0 mode as enabled/support - just to tell  in it821x_quirkproc()
501 		 * takes care of DMA mode programming).  in it821x_quirkproc()
505 			drive->current_speed = XFER_MW_DMA_0;  in it821x_quirkproc()
523  *	init_hwif_it821x	-	set up hwif structs
533 	struct pci_dev *dev = to_pci_dev(hwif->dev);  in init_hwif_it821x()
535 	struct it821x_dev *itdevs = host->host_priv;  in init_hwif_it821x()
536 	struct it821x_dev *idev = itdevs + hwif->channel;  in init_hwif_it821x()
543 		idev->smart = 1;  in init_hwif_it821x()
544 		hwif->host_flags |= IDE_HFLAG_NO_ATAPI_DMA;  in init_hwif_it821x()
547 		hwif->rqsize = 256;  in init_hwif_it821x()
551 	if (conf & (1 << (1 + hwif->channel)))  in init_hwif_it821x()
552 		idev->clock_mode = ATA_50;  in init_hwif_it821x()
554 		idev->clock_mode = ATA_66;  in init_hwif_it821x()
556 	idev->want[0][1] = ATA_ANY;  in init_hwif_it821x()
557 	idev->want[1][1] = ATA_ANY;  in init_hwif_it821x()
564 	if (dev->revision == 0x10) {  in init_hwif_it821x()
565 		idev->timing10 = 1;  in init_hwif_it821x()
566 		hwif->host_flags |= IDE_HFLAG_NO_ATAPI_DMA;  in init_hwif_it821x()
567 		if (idev->smart == 0)  in init_hwif_it821x()
572 	if (idev->smart == 0) {  in init_hwif_it821x()
573 		/* MWDMA/PIO clock switching for pass through mode */  in init_hwif_it821x()
574 		hwif->dma_ops = &it821x_pass_through_dma_ops;  in init_hwif_it821x()
576 		hwif->host_flags |= IDE_HFLAG_NO_SET_MODE;  in init_hwif_it821x()
578 	if (hwif->dma_base == 0)  in init_hwif_it821x()
581 	hwif->ultra_mask = ATA_UDMA6;  in init_hwif_it821x()
582 	hwif->mwdma_mask = ATA_MWDMA2;  in init_hwif_it821x()
584 	/* Vortex86SX quirk: prevent Ultra-DMA mode to fix BadCRC issue */  in init_hwif_it821x()
585 	if (idev->quirks & QUIRK_VORTEX86) {  in init_hwif_it821x()
586 		if (dev->revision == 0x11)  in init_hwif_it821x()
587 			hwif->ultra_mask = 0;  in init_hwif_it821x()
596 	/* Set to bypass mode, and reset PCI bus */  in it8212_disable_raid()
611 	static char *mode[2] = { "pass through", "smart" };  in init_chipset_it821x()  local
613 	/* Force the card into bypass mode if so requested */  in init_chipset_it821x()
615 		printk(KERN_INFO DRV_NAME " %s: forcing bypass mode\n",  in init_chipset_it821x()
620 	printk(KERN_INFO DRV_NAME " %s: controller in %s mode\n",  in init_chipset_it821x()
621 		pci_name(dev), mode[conf & 1]);  in init_chipset_it821x()
626 	/* it821x_set_{pio,dma}_mode() are only used in pass-through mode */
642  *	it821x_init_one	-	pci layer discovery entry
658 		return -ENOMEM;  in it821x_init_one()
661 	itdevs->quirks = id->driver_data;  in it821x_init_one()
673 	struct it821x_dev *itdevs = host->host_priv;  in it821x_remove()
711 MODULE_PARM_DESC(noraid, "Force card into bypass mode");