xref: /openbmc/linux/drivers/scsi/zalon.c (revision 791d3ef2)
1 /*
2  * Zalon 53c7xx device driver.
3  * By Richard Hirst (rhirst@linuxcare.com)
4  */
5 
6 #include <linux/init.h>
7 #include <linux/interrupt.h>
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <asm/hardware.h>
11 #include <asm/io.h>
12 
13 #include "../parisc/gsc.h"
14 
15 #include "ncr53c8xx.h"
16 
17 MODULE_AUTHOR("Richard Hirst");
18 MODULE_DESCRIPTION("Bluefish/Zalon 720 SCSI Driver");
19 MODULE_LICENSE("GPL");
20 
21 #define GSC_SCSI_ZALON_OFFSET 0x800
22 
23 #define IO_MODULE_EIM		(1*4)
24 #define IO_MODULE_DC_ADATA	(2*4)
25 #define IO_MODULE_II_CDATA	(3*4)
26 #define IO_MODULE_IO_COMMAND	(12*4)
27 #define IO_MODULE_IO_STATUS	(13*4)
28 
29 #define IOSTATUS_RY		0x40
30 #define IOSTATUS_FE		0x80
31 #define IOIIDATA_SMINT5L	0x40000000
32 #define IOIIDATA_MINT5EN	0x20000000
33 #define IOIIDATA_PACKEN		0x10000000
34 #define IOIIDATA_PREFETCHEN	0x08000000
35 #define IOIIDATA_IOII		0x00000020
36 
37 #define CMD_RESET		5
38 
39 static struct ncr_chip zalon720_chip __initdata = {
40 	.revision_id =	0x0f,
41 	.burst_max =	3,
42 	.offset_max =	8,
43 	.nr_divisor =	4,
44 	.features =	FE_WIDE | FE_DIFF | FE_EHP| FE_MUX | FE_EA,
45 };
46 
47 
48 
49 #if 0
50 /* FIXME:
51  * Is this function dead code? or is someone planning on using it in the
52  * future.  The clock = (int) pdc_result[16] does not look correct to
53  * me ... I think it should be iodc_data[16].  Since this cause a compile
54  * error with the new encapsulated PDC, I'm not compiling in this function.
55  * - RB
56  */
57 /* poke SCSI clock out of iodc data */
58 
59 static u8 iodc_data[32] __attribute__ ((aligned (64)));
60 static unsigned long pdc_result[32] __attribute__ ((aligned (16))) ={0,0,0,0};
61 
62 static int
63 lasi_scsi_clock(void * hpa, int defaultclock)
64 {
65 	int clock, status;
66 
67 	status = pdc_iodc_read(&pdc_result, hpa, 0, &iodc_data, 32 );
68 	if (status == PDC_RET_OK) {
69 		clock = (int) pdc_result[16];
70 	} else {
71 		printk(KERN_WARNING "%s: pdc_iodc_read returned %d\n", __func__, status);
72 		clock = defaultclock;
73 	}
74 
75 	printk(KERN_DEBUG "%s: SCSI clock %d\n", __func__, clock);
76  	return clock;
77 }
78 #endif
79 
80 static struct scsi_host_template zalon7xx_template = {
81 	.module		= THIS_MODULE,
82 	.proc_name	= "zalon7xx",
83 };
84 
85 static int __init
86 zalon_probe(struct parisc_device *dev)
87 {
88 	struct gsc_irq gsc_irq;
89 	u32 zalon_vers;
90 	int error = -ENODEV;
91 	void __iomem *zalon = ioremap_nocache(dev->hpa.start, 4096);
92 	void __iomem *io_port = zalon + GSC_SCSI_ZALON_OFFSET;
93 	static int unit = 0;
94 	struct Scsi_Host *host;
95 	struct ncr_device device;
96 
97 	__raw_writel(CMD_RESET, zalon + IO_MODULE_IO_COMMAND);
98 	while (!(__raw_readl(zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
99 		cpu_relax();
100 	__raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
101 		zalon + IO_MODULE_II_CDATA);
102 
103 	/* XXX: Save the Zalon version for bug workarounds? */
104 	zalon_vers = (__raw_readl(zalon + IO_MODULE_II_CDATA) >> 24) & 0x07;
105 
106 	/* Setup the interrupts first.
107 	** Later on request_irq() will register the handler.
108 	*/
109 	dev->irq = gsc_alloc_irq(&gsc_irq);
110 
111 	printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__,
112 		zalon_vers, dev->irq);
113 
114 	__raw_writel(gsc_irq.txn_addr | gsc_irq.txn_data, zalon + IO_MODULE_EIM);
115 
116 	if (zalon_vers == 0)
117 		printk(KERN_WARNING "%s: Zalon 1.1 or earlier\n", __func__);
118 
119 	memset(&device, 0, sizeof(struct ncr_device));
120 
121 	/* The following three are needed before any other access. */
122 	__raw_writeb(0x20, io_port + 0x38); /* DCNTL_REG,  EA  */
123 	__raw_writeb(0x04, io_port + 0x1b); /* CTEST0_REG, EHP */
124 	__raw_writeb(0x80, io_port + 0x22); /* CTEST4_REG, MUX */
125 
126 	/* Initialise ncr_device structure with items required by ncr_attach. */
127 	device.chip		= zalon720_chip;
128 	device.host_id		= 7;
129 	device.dev		= &dev->dev;
130 	device.slot.base	= dev->hpa.start + GSC_SCSI_ZALON_OFFSET;
131 	device.slot.base_v	= io_port;
132 	device.slot.irq		= dev->irq;
133 	device.differential	= 2;
134 
135 	host = ncr_attach(&zalon7xx_template, unit, &device);
136 	if (!host)
137 		return -ENODEV;
138 
139 	if (request_irq(dev->irq, ncr53c8xx_intr, IRQF_SHARED, "zalon", host)) {
140 	  dev_printk(KERN_ERR, &dev->dev, "irq problem with %d, detaching\n ",
141 		     dev->irq);
142 		goto fail;
143 	}
144 
145 	unit++;
146 
147 	dev_set_drvdata(&dev->dev, host);
148 
149 	error = scsi_add_host(host, &dev->dev);
150 	if (error)
151 		goto fail_free_irq;
152 
153 	scsi_scan_host(host);
154 	return 0;
155 
156  fail_free_irq:
157 	free_irq(dev->irq, host);
158  fail:
159 	ncr53c8xx_release(host);
160 	return error;
161 }
162 
163 static const struct parisc_device_id zalon_tbl[] __initconst = {
164 	{ HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
165 	{ 0, }
166 };
167 
168 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
169 
170 static int __exit zalon_remove(struct parisc_device *dev)
171 {
172 	struct Scsi_Host *host = dev_get_drvdata(&dev->dev);
173 
174 	scsi_remove_host(host);
175 	ncr53c8xx_release(host);
176 	free_irq(dev->irq, host);
177 
178 	return 0;
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 
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 
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