1 // SPDX-License-Identifier: GPL-2.0-only
3  *    pata_ns87415.c - NS87415 (and PARISC SUPERIO 87560) PATA
11  *    This driver assumes the firmware has left the chip in a valid ST506
39  *	ns87415_set_mode - Initialize host controller mode timings
45  *	device. Because the chip is quite an old design we have to do this
54 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);  in ns87415_set_mode()
55 	int unit		= 2 * ap->port_no + adev->devno;  in ns87415_set_mode()
63 	/* Timing register format is 17 - low nybble read timing with  in ns87415_set_mode()
64 	   the high nybble being 16 - x for recovery time in PCI clocks */  in ns87415_set_mode()
66 	ata_timing_compute(adev, adev->pio_mode, &t, T, 0);  in ns87415_set_mode()
68 	clocking = 17 - clamp_val(t.active, 2, 17);  in ns87415_set_mode()
69 	clocking |= (16 - clamp_val(t.recover, 1, 16)) << 4;  in ns87415_set_mode()
88 	/* Flip the IORDY/DMA bits now we are sure the write buffers are  in ns87415_set_mode()
97  *	ns87415_set_piomode - Initialize host controller PATA PIO timings
109 	ns87415_set_mode(ap, adev, adev->pio_mode);  in ns87415_set_piomode()
113  *	ns87415_bmdma_setup		-	Set up DMA
117  *	rather than use the helper due to a chip erratum
122 	struct ata_port *ap = qc->ap;  in ns87415_bmdma_setup()
123 	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);  in ns87415_bmdma_setup()
128 	iowrite32(ap->bmdma_prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);  in ns87415_bmdma_setup()
130 	/* specify data direction, triple-check start bit is clear */  in ns87415_bmdma_setup()
131 	dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);  in ns87415_bmdma_setup()
134 	   place - which does save us an I/O bizarrely */  in ns87415_bmdma_setup()
138 	iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);  in ns87415_bmdma_setup()
140 	ap->ops->sff_exec_command(ap, &qc->tf);  in ns87415_bmdma_setup()
144  *	ns87415_bmdma_start		-	Begin DMA transfer
147  *	Switch the timings for the chip and set up for a DMA transfer
156 	ns87415_set_mode(qc->ap, qc->dev, qc->dev->dma_mode);  in ns87415_bmdma_start()
161  *	ns87415_bmdma_stop		-	End DMA transfer
170 	ns87415_set_mode(qc->ap, qc->dev, qc->dev->pio_mode);  in ns87415_bmdma_stop()
174  *	ns87415_irq_clear		-	Clear interrupt
177  *	Erratum: Due to a chip bug registers 02 and 0A bit 1 and 2 (the
183 	void __iomem *mmio = ap->ioaddr.bmdma_addr;  in ns87415_irq_clear()
192  *	ns87415_check_atapi_dma		-	ATAPI DMA filter
201 	return -EOPNOTSUPP;  in ns87415_check_atapi_dma()
206 /* SUPERIO 87560 is a PoS chip that NatSem denies exists.
207  * Unfortunately, it's built-in on all Astro-based PA-RISC workstations
208  * which use the integrated NS87514 cell for CD-ROM support.
209  * i.e we have to support for CD-ROM installs.
220  *	ns87560_read_buggy	-	workaround buggy Super I/O chip
223  *	Work around chipset problems in the 87560 SuperIO chip
235 	} while(retries-- > 0);  in ns87560_read_buggy()
249 	return ns87560_read_buggy(ap->ioaddr.status_addr);  in ns87560_check_status()
253  *	ns87560_tf_read - input device's ATA taskfile shadow registers
257  *	Reads ATA taskfile registers for currently-selected device
265 	struct ata_ioports *ioaddr = &ap->ioaddr;  in ns87560_tf_read()
267 	tf->status = ns87560_check_status(ap);  in ns87560_tf_read()
268 	tf->error = ioread8(ioaddr->error_addr);  in ns87560_tf_read()
269 	tf->nsect = ioread8(ioaddr->nsect_addr);  in ns87560_tf_read()
270 	tf->lbal = ioread8(ioaddr->lbal_addr);  in ns87560_tf_read()
271 	tf->lbam = ioread8(ioaddr->lbam_addr);  in ns87560_tf_read()
272 	tf->lbah = ioread8(ioaddr->lbah_addr);  in ns87560_tf_read()
273 	tf->device = ns87560_read_buggy(ioaddr->device_addr);  in ns87560_tf_read()
275 	if (tf->flags & ATA_TFLAG_LBA48) {  in ns87560_tf_read()
276 		iowrite8(tf->ctl | ATA_HOB, ioaddr->ctl_addr);  in ns87560_tf_read()
277 		tf->hob_feature = ioread8(ioaddr->error_addr);  in ns87560_tf_read()
278 		tf->hob_nsect = ioread8(ioaddr->nsect_addr);  in ns87560_tf_read()
279 		tf->hob_lbal = ioread8(ioaddr->lbal_addr);  in ns87560_tf_read()
280 		tf->hob_lbam = ioread8(ioaddr->lbam_addr);  in ns87560_tf_read()
281 		tf->hob_lbah = ioread8(ioaddr->lbah_addr);  in ns87560_tf_read()
282 		iowrite8(tf->ctl, ioaddr->ctl_addr);  in ns87560_tf_read()
283 		ap->last_ctl = tf->ctl;  in ns87560_tf_read()
297 	return ns87560_read_buggy(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);  in ns87560_bmdma_status()
336  *	ns87415_init_one - Register 87415 ATA PCI device with kernel services
347  *	Zero on success, or -ERRNO value.
368 	if (PCI_SLOT(pdev->devfn) == 0x0E)  in ns87415_init_one()
371 	ata_print_version_once(&pdev->dev, DRV_VERSION);  in ns87415_init_one()
419 MODULE_DESCRIPTION("ATA low-level driver for NS87415 controllers");