1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  pata_rdc		-	Driver for later RDC PATA controllers
6  *  INCITS 370-2004 (1510D): ATA Host Adapter Standards
30  *	rdc_pata_cable_detect - Probe host controller cable detect info
42 	struct rdc_host_priv *hpriv = ap->host->private_data;  in rdc_pata_cable_detect()
46 	mask = 0x30 << (2 * ap->port_no);  in rdc_pata_cable_detect()
47 	if ((hpriv->saved_iocfg & mask) == 0)  in rdc_pata_cable_detect()
53  *	rdc_pata_prereset - prereset for PATA host controller
62 	struct ata_port *ap = link->ap;  in rdc_pata_prereset()
63 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);  in rdc_pata_prereset()
70 	if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no]))  in rdc_pata_prereset()
71 		return -ENOENT;  in rdc_pata_prereset()
78  *	rdc_set_piomode - Initialize host controller PATA PIO timings
82  *	Set PIO mode for device, in host controller PCI config space.
90 	unsigned int pio	= adev->pio_mode - XFER_PIO_0;  in rdc_set_piomode()  local
91 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);  in rdc_set_piomode()
93 	unsigned int is_slave	= (adev->devno != 0);  in rdc_set_piomode()
94 	unsigned int master_port= ap->port_no ? 0x42 : 0x40;  in rdc_set_piomode()
108 	if (pio >= 2)  in rdc_set_piomode()
113 	if (adev->class == ATA_DEV_ATA)  in rdc_set_piomode()
118 	/* PIO configuration clears DTE unconditionally.  It will be  in rdc_set_piomode()
120 	 * after set_piomode if any DMA mode is available.  in rdc_set_piomode()
131 		slave_data &= (ap->port_no ? 0x0f : 0xf0);  in rdc_set_piomode()
133 		slave_data |= ((timings[pio][0] << 2) | timings[pio][1])  in rdc_set_piomode()
134 						<< (ap->port_no ? 4 : 0);  in rdc_set_piomode()
142 			(timings[pio][0] << 12) |  in rdc_set_piomode()
143 			(timings[pio][1] << 8);  in rdc_set_piomode()
149 	/* Ensure the UDMA bit is off - it will be turned back on if  in rdc_set_piomode()
153 	udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));  in rdc_set_piomode()
160  *	rdc_set_dmamode - Initialize host controller PATA PIO timings
164  *	Set UDMA mode for device, in host controller PCI config space.
172 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);  in rdc_set_dmamode()
174 	u8 master_port		= ap->port_no ? 0x42 : 0x40;  in rdc_set_dmamode()
176 	u8 speed		= adev->dma_mode;  in rdc_set_dmamode()
177 	int devid		= adev->devno + 2 * ap->port_no;  in rdc_set_dmamode()
193 		unsigned int udma = adev->dma_mode - XFER_UDMA_0;  in rdc_set_dmamode()
205 		u_speed = min(2 - (udma & 1), udma);  in rdc_set_dmamode()
228 		 * MWDMA is driven by the PIO timings. We must also enable  in rdc_set_dmamode()
230 		 * been set when the PIO timing was set.  in rdc_set_dmamode()
232 		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;  in rdc_set_dmamode()
238 		int pio = needed_pio[mwdma] - XFER_PIO_0;  in rdc_set_dmamode()  local
242 		/* If the drive MWDMA is faster than it can do PIO then  in rdc_set_dmamode()
243 		   we must force PIO into PIO0 */  in rdc_set_dmamode()
245 		if (adev->pio_mode < needed_pio[mwdma])  in rdc_set_dmamode()
247 			control |= 8;	/* PIO cycles in PIO0 */  in rdc_set_dmamode()
249 		if (adev->devno) {	/* Slave */  in rdc_set_dmamode()
253 			slave_data &= (ap->port_no ? 0x0f : 0xf0);  in rdc_set_dmamode()
255 			slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);  in rdc_set_dmamode()
262 				(timings[pio][0] << 12) |  in rdc_set_dmamode()
263 				(timings[pio][1] << 8);  in rdc_set_dmamode()
296  *	rdc_init_one - Register PIIX ATA PCI device with kernel services
300  *	Called from kernel PCI layer.  We probe for combined mode (sigh),
307  *	Zero on success, or -ERRNO value.
312 	struct device *dev = &pdev->dev;  in rdc_init_one()
319 	ata_print_version_once(&pdev->dev, DRV_VERSION);  in rdc_init_one()
331 		return -ENOMEM;  in rdc_init_one()
336 	pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);  in rdc_init_one()
341 	host->private_data = hpriv;  in rdc_init_one()
345 	host->flags |= ATA_HOST_PARALLEL_SCAN;  in rdc_init_one()
354 	struct rdc_host_priv *hpriv = host->private_data;  in rdc_remove_one()
356 	pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);  in rdc_remove_one()
382 MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");