xref: /openbmc/linux/drivers/ata/pata_isapnp.c (revision 6fdfac35)
1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 /*
4  *   pata-isapnp.c - ISA PnP PATA controller driver.
5  *   Copyright 2005/2006 Red Hat Inc, all rights reserved.
6  *
7  *   Based in part on ide-pnp.c by Andrey Panin <pazke@donpac.ru>
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/isapnp.h>
13 #include <linux/init.h>
14 #include <linux/blkdev.h>
15 #include <linux/delay.h>
16 #include <scsi/scsi_host.h>
17 #include <linux/ata.h>
18 #include <linux/libata.h>
19 
20 #define DRV_NAME "pata_isapnp"
21 #define DRV_VERSION "0.2.5"
22 
23 static const struct scsi_host_template isapnp_sht = {
24 	ATA_PIO_SHT(DRV_NAME),
25 };
26 
27 static struct ata_port_operations isapnp_port_ops = {
28 	.inherits	= &ata_sff_port_ops,
29 	.cable_detect	= ata_cable_40wire,
30 };
31 
32 static struct ata_port_operations isapnp_noalt_port_ops = {
33 	.inherits	= &ata_sff_port_ops,
34 	.cable_detect	= ata_cable_40wire,
35 	/* No altstatus so we don't want to use the lost interrupt poll */
36 	.lost_interrupt = ATA_OP_NULL,
37 };
38 
39 /**
40  *	isapnp_init_one		-	attach an isapnp interface
41  *	@idev: PnP device
42  *	@dev_id: matching detect line
43  *
44  *	Register an ISA bus IDE interface. Such interfaces are PIO 0 and
45  *	non shared IRQ.
46  */
47 
isapnp_init_one(struct pnp_dev * idev,const struct pnp_device_id * dev_id)48 static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
49 {
50 	struct ata_host *host;
51 	struct ata_port *ap;
52 	void __iomem *cmd_addr, *ctl_addr;
53 	int irq = 0;
54 	irq_handler_t handler = NULL;
55 
56 	if (pnp_port_valid(idev, 0) == 0)
57 		return -ENODEV;
58 
59 	if (pnp_irq_valid(idev, 0)) {
60 		irq = pnp_irq(idev, 0);
61 		handler = ata_sff_interrupt;
62 	}
63 
64 	/* allocate host */
65 	host = ata_host_alloc(&idev->dev, 1);
66 	if (!host)
67 		return -ENOMEM;
68 
69 	/* acquire resources and fill host */
70 	cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
71 	if (!cmd_addr)
72 		return -ENOMEM;
73 
74 	ap = host->ports[0];
75 
76 	ap->ops = &isapnp_noalt_port_ops;
77 	ap->pio_mask = ATA_PIO0;
78 	ap->flags |= ATA_FLAG_SLAVE_POSS;
79 
80 	ap->ioaddr.cmd_addr = cmd_addr;
81 
82 	if (pnp_port_valid(idev, 1)) {
83 		ctl_addr = devm_ioport_map(&idev->dev,
84 					   pnp_port_start(idev, 1), 1);
85 		if (!ctl_addr)
86 			return -ENOMEM;
87 
88 		ap->ioaddr.altstatus_addr = ctl_addr;
89 		ap->ioaddr.ctl_addr = ctl_addr;
90 		ap->ops = &isapnp_port_ops;
91 	}
92 
93 	ata_sff_std_ports(&ap->ioaddr);
94 
95 	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
96 		      (unsigned long long)pnp_port_start(idev, 0),
97 		      (unsigned long long)pnp_port_start(idev, 1));
98 
99 	/* activate */
100 	return ata_host_activate(host, irq, handler, 0,
101 				 &isapnp_sht);
102 }
103 
104 /**
105  *	isapnp_remove_one	-	unplug an isapnp interface
106  *	@idev: PnP device
107  *
108  *	Remove a previously configured PnP ATA port. Called only on module
109  *	unload events as the core does not currently deal with ISAPnP docking.
110  */
111 
isapnp_remove_one(struct pnp_dev * idev)112 static void isapnp_remove_one(struct pnp_dev *idev)
113 {
114 	struct device *dev = &idev->dev;
115 	struct ata_host *host = dev_get_drvdata(dev);
116 
117 	ata_host_detach(host);
118 }
119 
120 static struct pnp_device_id isapnp_devices[] = {
121   	/* Generic ESDI/IDE/ATA compatible hard disk controller */
122 	{.id = "PNP0600", .driver_data = 0},
123 	{.id = ""}
124 };
125 
126 MODULE_DEVICE_TABLE(pnp, isapnp_devices);
127 
128 static struct pnp_driver isapnp_driver = {
129 	.name		= DRV_NAME,
130 	.id_table	= isapnp_devices,
131 	.probe		= isapnp_init_one,
132 	.remove		= isapnp_remove_one,
133 };
134 
135 module_pnp_driver(isapnp_driver);
136 MODULE_AUTHOR("Alan Cox");
137 MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
138 MODULE_LICENSE("GPL");
139 MODULE_VERSION(DRV_VERSION);
140