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(offset: dev->hpa.start, size: 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, addr: zalon + IO_MODULE_IO_COMMAND);
100 while (!(__raw_readl(addr: zalon + IO_MODULE_IO_STATUS) & IOSTATUS_RY))
101 cpu_relax();
102 __raw_writel(IOIIDATA_MINT5EN | IOIIDATA_PACKEN | IOIIDATA_PREFETCHEN,
103 addr: zalon + IO_MODULE_II_CDATA);
104
105 /* XXX: Save the Zalon version for bug workarounds? */
106 zalon_vers = (__raw_readl(addr: 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(dev: &gsc_irq);
112
113 printk(KERN_INFO "%s: Zalon version %d, IRQ %d\n", __func__,
114 zalon_vers, dev->irq);
115
116 __raw_writel(val: gsc_irq.txn_addr | gsc_irq.txn_data, addr: 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(val: 0x20, addr: io_port + 0x38); /* DCNTL_REG, EA */
125 __raw_writeb(val: 0x04, addr: io_port + 0x1b); /* CTEST0_REG, EHP */
126 __raw_writeb(val: 0x80, addr: 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(tpnt: &zalon7xx_template, unit, device: &device);
138 if (!host)
139 return -ENODEV;
140
141 if (request_irq(irq: dev->irq, handler: ncr53c8xx_intr, IRQF_SHARED, name: "zalon", dev: 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->dev, data: host);
150
151 error = scsi_add_host(host, dev: &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->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

source code of linux/drivers/scsi/zalon.c