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
zalon_probe(struct parisc_device * dev)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 struct parisc_device_id zalon_tbl[] = {
164 { HPHW_A_DMA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00089 },
165 { 0, }
166 };
167
168 MODULE_DEVICE_TABLE(parisc, zalon_tbl);
169
zalon_remove(struct parisc_device * dev)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 = {
182 .name = "zalon",
183 .id_table = zalon_tbl,
184 .probe = zalon_probe,
185 .remove = __devexit_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