xref: /openbmc/linux/drivers/scsi/zalon.c (revision 31160bd3)
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 
18 MODULE_AUTHOR("Richard Hirst");
19 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
20 MODULE_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 
40 static 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 
60 static u8 iodc_data[32] __attribute__ ((aligned (64)));
61 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
62 
63 static int
64 lasi_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 
81 static struct scsi_host_template zalon7xx_template = {
82 	.module		= THIS_MODULE,
83 	.proc_name	= "zalon7xx",
84 	.cmd_size	= sizeof(struct ncr_cmd_priv),
85 };
86 
87 static int __init
zalon_probe(struct parisc_device * dev)88 zalon_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 
165 static const struct parisc_device_id zalon_tbl[] __initconst = {
166 	{ HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
167 	{ 0, }
168 };
169 
170 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
171 
zalon_remove(struct parisc_device * dev)172 static 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 
181 static 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 
zalon7xx_init(void)188 static 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 
zalon7xx_exit(void)198 static void __exit zalon7xx_exit(void)
199 {
200 	unregister_parisc_driver(&zalon_driver);
201 	ncr53c8xx_exit();
202 }
203 
204 module_init(zalon7xx_init);
205 module_exit(zalon7xx_exit);
206