xref: /openbmc/linux/drivers/ata/pata_marvell.c (revision 25df73d9)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *	Marvell PATA driver.
4  *
5  *	For the moment we drive the PATA port in legacy mode. That
6  *	isn't making full use of the device functionality but it is
7  *	easy to get working.
8  *
9  *	(c) 2006 Red Hat
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/pci.h>
15 #include <linux/blkdev.h>
16 #include <linux/delay.h>
17 #include <linux/device.h>
18 #include <scsi/scsi_host.h>
19 #include <linux/libata.h>
20 #include <linux/ata.h>
21 
22 #define DRV_NAME	"pata_marvell"
23 #define DRV_VERSION	"0.1.6"
24 
25 /**
26  *	marvell_pata_active	-	check if PATA is active
27  *	@pdev: PCI device
28  *
29  *	Returns 1 if the PATA port may be active. We know how to check this
30  *	for the 6145 but not the other devices
31  */
32 
marvell_pata_active(struct pci_dev * pdev)33 static int marvell_pata_active(struct pci_dev *pdev)
34 {
35 	u32 devices;
36 	void __iomem *barp;
37 
38 	/* We don't yet know how to do this for other devices */
39 	if (pdev->device != 0x6145)
40 		return 1;
41 
42 	barp = pci_iomap(pdev, 5, 0x10);
43 	if (barp == NULL)
44 		return -ENOMEM;
45 
46 	devices = ioread32(barp + 0x0C);
47 	pci_iounmap(pdev, barp);
48 
49 	if (devices & 0x10)
50 		return 1;
51 	return 0;
52 }
53 
54 /**
55  *	marvell_pre_reset	-	probe begin
56  *	@link: link
57  *	@deadline: deadline jiffies for the operation
58  *
59  *	Perform the PATA port setup we need.
60  */
61 
marvell_pre_reset(struct ata_link * link,unsigned long deadline)62 static int marvell_pre_reset(struct ata_link *link, unsigned long deadline)
63 {
64 	struct ata_port *ap = link->ap;
65 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
66 
67 	if (pdev->device == 0x6145 && ap->port_no == 0 &&
68 		!marvell_pata_active(pdev))	/* PATA enable ? */
69 			return -ENOENT;
70 
71 	return ata_sff_prereset(link, deadline);
72 }
73 
marvell_cable_detect(struct ata_port * ap)74 static int marvell_cable_detect(struct ata_port *ap)
75 {
76 	/* Cable type */
77 	switch(ap->port_no)
78 	{
79 	case 0:
80 		if (!ap->ioaddr.bmdma_addr)
81 			return ATA_CBL_PATA_UNK;
82 		if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1)
83 			return ATA_CBL_PATA40;
84 		return ATA_CBL_PATA80;
85 	case 1: /* Legacy SATA port */
86 		return ATA_CBL_SATA;
87 	}
88 
89 	BUG();
90 	return 0;	/* Our BUG macro needs the right markup */
91 }
92 
93 /* No PIO or DMA methods needed for this device */
94 
95 static const struct scsi_host_template marvell_sht = {
96 	ATA_BMDMA_SHT(DRV_NAME),
97 };
98 
99 static struct ata_port_operations marvell_ops = {
100 	.inherits		= &ata_bmdma_port_ops,
101 	.cable_detect		= marvell_cable_detect,
102 	.prereset		= marvell_pre_reset,
103 };
104 
105 
106 /**
107  *	marvell_init_one - Register Marvell ATA PCI device with kernel services
108  *	@pdev: PCI device to register
109  *	@id: PCI device ID
110  *
111  *	Called from kernel PCI layer.
112  *
113  *	LOCKING:
114  *	Inherited from PCI layer (may sleep).
115  *
116  *	RETURNS:
117  *	Zero on success, or -ERRNO value.
118  */
119 
marvell_init_one(struct pci_dev * pdev,const struct pci_device_id * id)120 static int marvell_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
121 {
122 	static const struct ata_port_info info = {
123 		.flags		= ATA_FLAG_SLAVE_POSS,
124 
125 		.pio_mask	= ATA_PIO4,
126 		.mwdma_mask	= ATA_MWDMA2,
127 		.udma_mask 	= ATA_UDMA5,
128 
129 		.port_ops	= &marvell_ops,
130 	};
131 	static const struct ata_port_info info_sata = {
132 		/* Slave possible as its magically mapped not real */
133 		.flags		= ATA_FLAG_SLAVE_POSS,
134 
135 		.pio_mask	= ATA_PIO4,
136 		.mwdma_mask	= ATA_MWDMA2,
137 		.udma_mask 	= ATA_UDMA6,
138 
139 		.port_ops	= &marvell_ops,
140 	};
141 	const struct ata_port_info *ppi[] = { &info, &info_sata };
142 
143 	if (pdev->device == 0x6101)
144 		ppi[1] = &ata_dummy_port_info;
145 
146 #if IS_ENABLED(CONFIG_SATA_AHCI)
147 	if (!marvell_pata_active(pdev)) {
148 		dev_info(&pdev->dev,
149 			 "PATA port not active, deferring to AHCI driver.\n");
150 		return -ENODEV;
151 	}
152 #endif
153 	return ata_pci_bmdma_init_one(pdev, ppi, &marvell_sht, NULL, 0);
154 }
155 
156 static const struct pci_device_id marvell_pci_tbl[] = {
157 	{ PCI_DEVICE(0x11AB, 0x6101), },
158 	{ PCI_DEVICE(0x11AB, 0x6121), },
159 	{ PCI_DEVICE(0x11AB, 0x6123), },
160 	{ PCI_DEVICE(0x11AB, 0x6145), },
161 	{ PCI_DEVICE(0x1B4B, 0x91A0), },
162 	{ PCI_DEVICE(0x1B4B, 0x91A4), },
163 
164 	{ }	/* terminate list */
165 };
166 
167 static struct pci_driver marvell_pci_driver = {
168 	.name			= DRV_NAME,
169 	.id_table		= marvell_pci_tbl,
170 	.probe			= marvell_init_one,
171 	.remove			= ata_pci_remove_one,
172 #ifdef CONFIG_PM_SLEEP
173 	.suspend		= ata_pci_device_suspend,
174 	.resume			= ata_pci_device_resume,
175 #endif
176 };
177 
178 module_pci_driver(marvell_pci_driver);
179 
180 MODULE_AUTHOR("Alan Cox");
181 MODULE_DESCRIPTION("SCSI low-level driver for Marvell ATA in legacy mode");
182 MODULE_LICENSE("GPL");
183 MODULE_DEVICE_TABLE(pci, marvell_pci_tbl);
184 MODULE_VERSION(DRV_VERSION);
185