xref: /linux/drivers/scsi/mvme16x_scsi.c (revision 151ebcf0797b1a3ba53c8843dc21748c80e098c7)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Detection routine for the NCR53c710 based MVME16x SCSI Controllers for Linux.
4  *
5  * Based on work by Alan Hourihane
6  *
7  * Rewritten to use 53c700.c by Kars de Jong <jongk@linux-m68k.org>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/blkdev.h>
12 #include <linux/device.h>
13 #include <linux/platform_device.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <asm/mvme16xhw.h>
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_device.h>
20 #include <scsi/scsi_transport.h>
21 #include <scsi/scsi_transport_spi.h>
22 
23 #include "53c700.h"
24 
25 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
26 MODULE_DESCRIPTION("MVME16x NCR53C710 driver");
27 MODULE_LICENSE("GPL");
28 
29 static struct scsi_host_template mvme16x_scsi_driver_template = {
30 	.name			= "MVME16x NCR53c710 SCSI",
31 	.proc_name		= "MVME16x",
32 	.this_id		= 7,
33 	.module			= THIS_MODULE,
34 };
35 
36 static struct platform_device *mvme16x_scsi_device;
37 
38 static int mvme16x_probe(struct platform_device *dev)
39 {
40 	struct Scsi_Host * host = NULL;
41 	struct NCR_700_Host_Parameters *hostdata;
42 
43 	if (!MACH_IS_MVME16x)
44 		goto out;
45 
46 	if (mvme16x_config & MVME16x_CONFIG_NO_SCSICHIP) {
47 		printk(KERN_INFO "mvme16x-scsi: detection disabled, "
48 				 "SCSI chip not present\n");
49 		goto out;
50 	}
51 
52 	hostdata = kzalloc(sizeof(struct NCR_700_Host_Parameters), GFP_KERNEL);
53 	if (hostdata == NULL) {
54 		printk(KERN_ERR "mvme16x-scsi: "
55 				"Failed to allocate host data\n");
56 		goto out;
57 	}
58 
59 	/* Fill in the required pieces of hostdata */
60 	hostdata->base = (void __iomem *)0xfff47000UL;
61 	hostdata->clock = 50;	/* XXX - depends on the CPU clock! */
62 	hostdata->chip710 = 1;
63 	hostdata->dmode_extra = DMODE_FC2;
64 	hostdata->dcntl_extra = EA_710;
65 	hostdata->ctest7_extra = CTEST7_TT1;
66 
67 	/* and register the chip */
68 	host = NCR_700_detect(&mvme16x_scsi_driver_template, hostdata,
69 			      &dev->dev);
70 	if (!host) {
71 		printk(KERN_ERR "mvme16x-scsi: No host detected; "
72 				"board configuration problem?\n");
73 		goto out_free;
74 	}
75 	host->this_id = 7;
76 	host->base = 0xfff47000UL;
77 	host->irq = MVME16x_IRQ_SCSI;
78 	if (request_irq(host->irq, NCR_700_intr, 0, "mvme16x-scsi", host)) {
79 		printk(KERN_ERR "mvme16x-scsi: request_irq failed\n");
80 		goto out_put_host;
81 	}
82 
83 	/* Enable scsi chip ints */
84 	{
85 		volatile unsigned long v;
86 
87 		/* Enable scsi interrupts at level 4 in PCCchip2 */
88 		v = in_be32(0xfff4202c);
89 		v = (v & ~0xff) | 0x10 | 4;
90 		out_be32(0xfff4202c, v);
91 	}
92 
93 	platform_set_drvdata(dev, host);
94 	scsi_scan_host(host);
95 
96 	return 0;
97 
98  out_put_host:
99 	scsi_host_put(host);
100  out_free:
101 	kfree(hostdata);
102  out:
103 	return -ENODEV;
104 }
105 
106 static void mvme16x_device_remove(struct platform_device *dev)
107 {
108 	struct Scsi_Host *host = platform_get_drvdata(dev);
109 	struct NCR_700_Host_Parameters *hostdata = shost_priv(host);
110 
111 	/* Disable scsi chip ints */
112 	{
113 		volatile unsigned long v;
114 
115 		v = in_be32(0xfff4202c);
116 		v &= ~0x10;
117 		out_be32(0xfff4202c, v);
118 	}
119 	scsi_remove_host(host);
120 	NCR_700_release(host);
121 	kfree(hostdata);
122 	free_irq(host->irq, host);
123 }
124 
125 static struct platform_driver mvme16x_scsi_driver = {
126 	.driver = {
127 		.name           = "mvme16x-scsi",
128 	},
129 	.probe          = mvme16x_probe,
130 	.remove_new     = mvme16x_device_remove,
131 };
132 
133 static int __init mvme16x_scsi_init(void)
134 {
135 	int err;
136 
137 	err = platform_driver_register(&mvme16x_scsi_driver);
138 	if (err)
139 		return err;
140 
141 	mvme16x_scsi_device = platform_device_register_simple("mvme16x-scsi",
142 							      -1, NULL, 0);
143 	if (IS_ERR(mvme16x_scsi_device)) {
144 		platform_driver_unregister(&mvme16x_scsi_driver);
145 		return PTR_ERR(mvme16x_scsi_device);
146 	}
147 
148 	return 0;
149 }
150 
151 static void __exit mvme16x_scsi_exit(void)
152 {
153 	platform_device_unregister(mvme16x_scsi_device);
154 	platform_driver_unregister(&mvme16x_scsi_driver);
155 }
156 
157 module_init(mvme16x_scsi_init);
158 module_exit(mvme16x_scsi_exit);
159