1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Oak Generic NCR5380 driver
4 *
5 * Copyright 1995-2002, Russell King
6 */
7
8#include <linux/module.h>
9#include <linux/ioport.h>
10#include <linux/blkdev.h>
11#include <linux/init.h>
12
13#include <asm/ecard.h>
14#include <asm/io.h>
15
16#include <scsi/scsi_host.h>
17
18#define priv(host)			((struct NCR5380_hostdata *)(host)->hostdata)
19
20#define NCR5380_read(reg)           readb(hostdata->io + ((reg) << 2))
21#define NCR5380_write(reg, value)   writeb(value, hostdata->io + ((reg) << 2))
22
23#define NCR5380_dma_xfer_len		NCR5380_dma_xfer_none
24#define NCR5380_dma_recv_setup		oakscsi_pread
25#define NCR5380_dma_send_setup		oakscsi_pwrite
26#define NCR5380_dma_residual		NCR5380_dma_residual_none
27
28#define NCR5380_queue_command		oakscsi_queue_command
29#define NCR5380_info			oakscsi_info
30
31#define NCR5380_implementation_fields	/* none */
32
33#include "../NCR5380.h"
34
35#undef START_DMA_INITIATOR_RECEIVE_REG
36#define START_DMA_INITIATOR_RECEIVE_REG	(128 + 7)
37
38#define STAT	((128 + 16) << 2)
39#define DATA	((128 + 8) << 2)
40
41static inline int oakscsi_pwrite(struct NCR5380_hostdata *hostdata,
42                                 unsigned char *addr, int len)
43{
44  u8 __iomem *base = hostdata->io;
45
46printk("writing %p len %d\n",addr, len);
47
48  while(1)
49  {
50    int status;
51    while (((status = readw(base + STAT)) & 0x100)==0);
52  }
53  return 0;
54}
55
56static inline int oakscsi_pread(struct NCR5380_hostdata *hostdata,
57                                unsigned char *addr, int len)
58{
59  u8 __iomem *base = hostdata->io;
60
61printk("reading %p len %d\n", addr, len);
62  while(len > 0)
63  {
64    unsigned int status, timeout;
65    unsigned long b;
66
67    timeout = 0x01FFFFFF;
68
69    while (((status = readw(base + STAT)) & 0x100)==0)
70    {
71      timeout--;
72      if(status & 0x200 || !timeout)
73      {
74        printk("status = %08X\n", status);
75        return -1;
76      }
77    }
78
79    if(len >= 128)
80    {
81      readsw(base + DATA, addr, 128);
82      addr += 128;
83      len -= 128;
84    }
85    else
86    {
87      b = (unsigned long) readw(base + DATA);
88      *addr ++ = b;
89      len -= 1;
90      if(len)
91        *addr ++ = b>>8;
92      len -= 1;
93    }
94  }
95  return 0;
96}
97
98#undef STAT
99#undef DATA
100
101#include "../NCR5380.c"
102
103static const struct scsi_host_template oakscsi_template = {
104	.module			= THIS_MODULE,
105	.name			= "Oak 16-bit SCSI",
106	.info			= oakscsi_info,
107	.queuecommand		= oakscsi_queue_command,
108	.eh_abort_handler	= NCR5380_abort,
109	.eh_host_reset_handler	= NCR5380_host_reset,
110	.can_queue		= 16,
111	.this_id		= 7,
112	.sg_tablesize		= SG_ALL,
113	.cmd_per_lun		= 2,
114	.dma_boundary		= PAGE_SIZE - 1,
115	.proc_name		= "oakscsi",
116	.cmd_size		= sizeof(struct NCR5380_cmd),
117	.max_sectors		= 128,
118};
119
120static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
121{
122	struct Scsi_Host *host;
123	int ret;
124
125	ret = ecard_request_resources(ec);
126	if (ret)
127		goto out;
128
129	host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
130	if (!host) {
131		ret = -ENOMEM;
132		goto release;
133	}
134
135	priv(host)->io = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
136	                         ecard_resource_len(ec, ECARD_RES_MEMC));
137	if (!priv(host)->io) {
138		ret = -ENOMEM;
139		goto unreg;
140	}
141
142	host->irq = NO_IRQ;
143
144	ret = NCR5380_init(host, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP);
145	if (ret)
146		goto out_unmap;
147
148	NCR5380_maybe_reset_bus(host);
149
150	ret = scsi_add_host(host, &ec->dev);
151	if (ret)
152		goto out_exit;
153
154	scsi_scan_host(host);
155	goto out;
156
157 out_exit:
158	NCR5380_exit(host);
159 out_unmap:
160	iounmap(priv(host)->io);
161 unreg:
162	scsi_host_put(host);
163 release:
164	ecard_release_resources(ec);
165 out:
166	return ret;
167}
168
169static void oakscsi_remove(struct expansion_card *ec)
170{
171	struct Scsi_Host *host = ecard_get_drvdata(ec);
172	void __iomem *base = priv(host)->io;
173
174	ecard_set_drvdata(ec, NULL);
175	scsi_remove_host(host);
176
177	NCR5380_exit(host);
178	scsi_host_put(host);
179	iounmap(base);
180	ecard_release_resources(ec);
181}
182
183static const struct ecard_id oakscsi_cids[] = {
184	{ MANU_OAK, PROD_OAK_SCSI },
185	{ 0xffff, 0xffff }
186};
187
188static struct ecard_driver oakscsi_driver = {
189	.probe		= oakscsi_probe,
190	.remove		= oakscsi_remove,
191	.id_table	= oakscsi_cids,
192	.drv = {
193		.name		= "oakscsi",
194	},
195};
196
197static int __init oakscsi_init(void)
198{
199	return ecard_register_driver(&oakscsi_driver);
200}
201
202static void __exit oakscsi_exit(void)
203{
204	ecard_remove_driver(&oakscsi_driver);
205}
206
207module_init(oakscsi_init);
208module_exit(oakscsi_exit);
209
210MODULE_AUTHOR("Russell King");
211MODULE_DESCRIPTION("Oak SCSI driver");
212MODULE_LICENSE("GPL");
213
214