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
25MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
26MODULE_DESCRIPTION("MVME16x NCR53C710 driver");
27MODULE_LICENSE("GPL");
28
29static 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
36static struct platform_device *mvme16x_scsi_device;
37
38static 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
106static 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
125static 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
133static 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
151static void __exit mvme16x_scsi_exit(void)
152{
153	platform_device_unregister(mvme16x_scsi_device);
154	platform_driver_unregister(&mvme16x_scsi_driver);
155}
156
157module_init(mvme16x_scsi_init);
158module_exit(mvme16x_scsi_exit);
159