1 // SPDX-License-Identifier: GPL-2.0-only
3  * pata_optidma.c 	- Opti DMA PATA for new ATA layer
6  *	The Opti DMA controllers are related to the older PIO PCI controllers
11  *	This driver should support Viper-N+, FireStar, FireStar Plus.
13  *	These devices support virtual DMA for read (aka the CS5520). Later
15  *	so you have to get this right. We don't support the virtual DMA
18  *	Bits that are worth knowing
20  *		0x1F5 bit 0 tells you if the PCI/VLB clock is 33 or 25Mhz
21  *		Virtual DMA registers *move* between rev 0x02 and rev 0x10
45 static int pci_clock;	/* 0 = 33 1 = 25 */
48  *	optidma_pre_reset		-	probe begin
57 	struct ata_port *ap = link->ap;  in optidma_pre_reset()
58 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);  in optidma_pre_reset()
63 	if (ap->port_no && !pci_test_config_bits(pdev, &optidma_enable_bits))  in optidma_pre_reset()
64 		return -ENOENT;  in optidma_pre_reset()
70  *	optidma_unlock		-	unlock control registers
79 	void __iomem *regio = ap->ioaddr.cmd_addr;  in optidma_unlock()
88  *	optidma_lock		-	issue temporary relock
91  *	Re-lock the configuration register settings.
96 	void __iomem *regio = ap->ioaddr.cmd_addr;  in optidma_lock()
103  *	optidma_mode_setup	-	set mode data
108  *	Called to do the DMA or PIO mode setup. Timing numbers are all
119 	int pio = adev->pio_mode - XFER_PIO_0;  in optidma_mode_setup()
120 	int dma = adev->dma_mode - XFER_MW_DMA_0;  in optidma_mode_setup()  local
121 	void __iomem *regio = ap->ioaddr.cmd_addr;  in optidma_mode_setup()
145  	 *	need to look at slowest of PIO/DMA mode of either device  in optidma_mode_setup()
159 			pair_addr = addr_timing[pci_clock][pair->pio_mode - XFER_PIO_0];  in optidma_mode_setup()
166 	iowrite8(adev->devno, regio + MISC_REG);  in optidma_mode_setup()
172 		iowrite8(dma_data_rec_timing[pci_clock][dma], regio + READ_REG);  in optidma_mode_setup()
173 		iowrite8(dma_data_rec_timing[pci_clock][dma], regio + WRITE_REG);  in optidma_mode_setup()
176 	iowrite8(addr | adev->devno, regio + MISC_REG);  in optidma_mode_setup()
186 	   until we've done both sets of PIO/DMA timings */  in optidma_mode_setup()
190  *	optiplus_mode_setup	-	DMA setup for Firestar Plus
195  *	The Firestar plus has additional UDMA functionality for UDMA0-2 and
203 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);  in optiplus_mode_setup()
206 	int dev2 = 2 * adev->devno;  in optiplus_mode_setup()
207 	int unit = 2 * ap->port_no + adev->devno;  in optiplus_mode_setup()
208 	int udma = mode - XFER_UDMA_0;  in optiplus_mode_setup()
213 		optidma_mode_setup(ap, adev, adev->dma_mode);  in optiplus_mode_setup()
216 		if (ap->port_no) {  in optiplus_mode_setup()
230  *	optidma_set_pio_mode	-	PIO setup callback
235  *	DMA programming. The architecture of the Firestar makes it easier
241 	optidma_mode_setup(ap, adev, adev->pio_mode);  in optidma_set_pio_mode()
245  *	optidma_set_dma_mode	-	DMA setup callback
250  *	DMA programming. The architecture of the Firestar makes it easier
256 	optidma_mode_setup(ap, adev, adev->dma_mode);  in optidma_set_dma_mode()
260  *	optiplus_set_pio_mode	-	PIO setup callback
265  *	DMA programming. The architecture of the Firestar makes it easier
271 	optiplus_mode_setup(ap, adev, adev->pio_mode);  in optiplus_set_pio_mode()
275  *	optiplus_set_dma_mode	-	DMA setup callback
280  *	DMA programming. The architecture of the Firestar makes it easier
286 	optiplus_mode_setup(ap, adev, adev->dma_mode);  in optiplus_set_dma_mode()
290  *	optidma_make_bits43	-	PCI setup helper
293  *	Turn the ATA device setup into PCI configuration bits
294  *	for register 0x43 and return the two bits needed.
305 		return adev->dma_mode - XFER_MW_DMA_0;  in optidma_make_bits43()
306 	return bits43[adev->pio_mode - XFER_PIO_0];  in optidma_make_bits43()
310  *	optidma_set_mode	-	mode setup
315  *	configuration by writing the nibble of extra bits of data into
321 	struct ata_port *ap = link->ap;  in optidma_set_mode()
323 	int nybble = 4 * ap->port_no;  in optidma_set_mode()
324 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);  in optidma_set_mode()
330 		r |= (optidma_make_bits43(&link->device[0]) +  in optidma_set_mode()
331 		     (optidma_make_bits43(&link->device[0]) << 2)) << nybble;  in optidma_set_mode()
357  *	optiplus_with_udma	-	Look for UDMA capable setup
417 	ata_print_version_once(&dev->dev, DRV_VERSION);  in optidma_init_one()
426 	pci_clock = inb(0x1F5) & 1;		/* 0 = 33Mhz, 1 = 25Mhz */  in optidma_init_one()
454 MODULE_DESCRIPTION("low-level driver for Opti Firestar/Firestar Plus");