1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Zalon 53c7xx device driver.
4 * By Richard Hirst (rhirst@linuxcare.com)
5 */
6
7#include <linux/init.h>
8#include <linux/interrupt.h>
9#include <linux/module.h>
10#include <linux/types.h>
11#include <asm/hardware.h>
12#include <asm/io.h>
13
14#include "../parisc/gsc.h"
15
16#include "ncr53c8xx.h"
17
18MODULE_AUTHOR("Richard Hirst");
19MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
20MODULE_LICENSE("GPL");
21
22#define GSC_SCSI_ZALON_OFFSET 0x800
23
24#define IO_MODULE_EIM		(1*4)
25#define IO_MODULE_DC_ADATA	(2*4)
26#define IO_MODULE_II_CDATA	(3*4)
27#define IO_MODULE_IO_COMMAND	(12*4)
28#define IO_MODULE_IO_STATUS	(13*4)
29
30#define IOSTATUS_RY		0x40
31#define IOSTATUS_FE		0x80
32#define IOIIDATA_SMINT5L	0x40000000
33#define IOIIDATA_MINT5EN	0x20000000
34#define IOIIDATA_PACKEN		0x10000000
35#define IOIIDATA_PREFETCHEN	0x08000000
36#define IOIIDATA_IOII		0x00000020
37
38#define CMD_RESET		5
39
40static struct ncr_chip zalon720_chip __initdata = {
41	.revision_id =	0x0f,
42	.burst_max =	3,
43	.offset_max =	8,
44	.nr_divisor =	4,
45	.features =	FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA,
46};
47
48
49
50#if 0
51/* FIXME:
52 * Is this function dead code? or is someone planning on using it in the
53 * future.  The clock = (int) pdc_result[16] does not look correct to
54 * me ... I think it should be iodc_data[16].  Since this cause a compile
55 * error with the new encapsulated PDC, I'm not compiling in this function.
56 * - RB
57 */
58/* poke SCSI clock out of iodc data */
59
60static u8 iodc_data[32] __attribute__ ((aligned (64)));
61static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
62
63static int
64lasi_scsi_clock(void * hpa, int defaultclock)
65{
66	int clock, status;
67
68	status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 );
69	if (status == PDC_RET_OK) {
70		clock = (int) pdc_result[16];
71	} else {
72		printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __func__, status);
73		clock = defaultclock;
74	}
75
76	printk(KERN_DEBUG "%s: SCSI clock %d\n", __func__, clock);
77 	return clock;
78}
79#endif
80
81static struct scsi_host_template zalon7xx_template = {
82	.module		= THIS_MODULE,
83	.proc_name	= "zalon7xx",
84	.cmd_size	= sizeof(struct ncr_cmd_priv),
85};
86
87static int __init
88zalon_probe(struct parisc_device *dev)
89{
90	struct gsc_irq gsc_irq;
91	u32 zalon_vers;
92	int error = -ENODEV;
93	void __iomem *zalon = ioremap(dev->hpa.start, 4096);
94	void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET;
95	static int unit = 0;
96	struct Scsi_Host *host;
97	struct ncr_device device;
98
99	__raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND);
100	while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
101		cpu_relax();
102	__raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
103		zalon + IO_MODULE_II_CDATA);
104
105	/* XXX: Save the Zalon version for bug workarounds? */
106	zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07;
107
108	/* Setup the interrupts first.
109	** Later on request_irq() will register the handler.
110	*/
111	dev->irq = gsc_alloc_irq(&gsc_irq);
112
113	printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__,
114		zalon_vers, dev->irq);
115
116	__raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM);
117
118	if (zalon_vers == 0)
119		printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__);
120
121	memset(&device, 0, sizeof(struct ncr_device));
122
123	/* The following three are needed before any other access. */
124	__raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG,  EA  */
125	__raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */
126	__raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */
127
128	/* Initialise ncr_device structure with items required by ncr_attach. */
129	device.chip		= zalon720_chip;
130	device.host_id		= 7;
131	device.dev		= &dev->dev;
132	device.slot.base	= dev->hpa.start + GSC_SCSI_ZALON_OFFSET;
133	device.slot.base_v	= io_port;
134	device.slot.irq		= dev->irq;
135	device.differential	= 2;
136
137	host = ncr_attach(&zalon7xx_template, unit, &device);
138	if (!host)
139		return -ENODEV;
140
141	if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) {
142	  dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ",
143		     dev->irq);
144		goto fail;
145	}
146
147	unit++;
148
149	dev_set_drvdata(&dev->dev, host);
150
151	error = scsi_add_host(host, &dev->dev);
152	if (error)
153		goto fail_free_irq;
154
155	scsi_scan_host(host);
156	return 0;
157
158 fail_free_irq:
159	free_irq(dev->irq, host);
160 fail:
161	ncr53c8xx_release(host);
162	return error;
163}
164
165static const struct parisc_device_id zalon_tbl[] __initconst = {
166	{ HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
167	{ 0, }
168};
169
170MODULE_DEVICE_TABLE(parisc, zalon_tbl);
171
172static void __exit zalon_remove(struct parisc_device *dev)
173{
174	struct Scsi_Host *host = dev_get_drvdata(&dev->dev);
175
176	scsi_remove_host(host);
177	ncr53c8xx_release(host);
178	free_irq(dev->irq, host);
179}
180
181static struct parisc_driver zalon_driver __refdata = {
182	.name =		"zalon",
183	.id_table =	zalon_tbl,
184	.probe =	zalon_probe,
185	.remove =	__exit_p(zalon_remove),
186};
187
188static int __init zalon7xx_init(void)
189{
190	int ret = ncr53c8xx_init();
191	if (!ret)
192		ret = register_parisc_driver(&zalon_driver);
193	if (ret)
194		ncr53c8xx_exit();
195	return ret;
196}
197
198static void __exit zalon7xx_exit(void)
199{
200	unregister_parisc_driver(&zalon_driver);
201	ncr53c8xx_exit();
202}
203
204module_init(zalon7xx_init);
205module_exit(zalon7xx_exit);
206