1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
*
* Copyright (C) 2007 Thomas Bogend�rfer (tsbogend@alpha.frankende)
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/jazz.h>
#include <asm/jazzdma.h>
#include <scsi/scsi_host.h>
#include "esp_scsi.h"
#define DRV_MODULE_NAME "jazz_esp"
#define PFX DRV_MODULE_NAME ": "
#define DRV_VERSION "1.000"
#define DRV_MODULE_RELDATE "May 19, 2007"
static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
{
*(volatile u8 *)(esp->regs + reg) = val;
}
static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
{
return *(volatile u8 *)(esp->regs + reg);
}
static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf,
size_t sz, int dir)
{
return dma_map_single(esp->dev, buf, sz, dir);
}
static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg,
int num_sg, int dir)
{
return dma_map_sg(esp->dev, sg, num_sg, dir);
}
static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr,
size_t sz, int dir)
{
dma_unmap_single(esp->dev, addr, sz, dir);
}
static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
int num_sg, int dir)
{
dma_unmap_sg(esp->dev, sg, num_sg, dir);
}
static int jazz_esp_irq_pending(struct esp *esp)
{
if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
return 1;
return 0;
}
static void jazz_esp_reset_dma(struct esp *esp)
{
vdma_disable ((int)esp->dma_regs);
}
static void jazz_esp_dma_drain(struct esp *esp)
{
/* nothing to do */
}
static void jazz_esp_dma_invalidate(struct esp *esp)
{
vdma_disable ((int)esp->dma_regs);
}
static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
u32 dma_count, int write, u8 cmd)
{
BUG_ON(!(cmd & ESP_CMD_DMA));
jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
vdma_disable ((int)esp->dma_regs);
if (write)
vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
else
vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
vdma_set_addr ((int)esp->dma_regs, addr);
vdma_set_count ((int)esp->dma_regs, dma_count);
vdma_enable ((int)esp->dma_regs);
scsi_esp_cmd(esp, cmd);
}
static int jazz_esp_dma_error(struct esp *esp)
{
u32 enable = vdma_get_enable((int)esp->dma_regs);
if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
return 1;
return 0;
}
static const struct esp_driver_ops jazz_esp_ops = {
.esp_write8 = jazz_esp_write8,
.esp_read8 = jazz_esp_read8,
.map_single = jazz_esp_map_single,
.map_sg = jazz_esp_map_sg,
.unmap_single = jazz_esp_unmap_single,
.unmap_sg = jazz_esp_unmap_sg,
.irq_pending = jazz_esp_irq_pending,
.reset_dma = jazz_esp_reset_dma,
.dma_drain = jazz_esp_dma_drain,
.dma_invalidate = jazz_esp_dma_invalidate,
.send_dma_cmd = jazz_esp_send_dma_cmd,
.dma_error = jazz_esp_dma_error,
};
static int __devinit esp_jazz_probe(struct platform_device *dev)
{
struct scsi_host_template *tpnt = &scsi_esp_template;
struct Scsi_Host *host;
struct esp *esp;
struct resource *res;
int err;
host = scsi_host_alloc(tpnt, sizeof(struct esp));
err = -ENOMEM;
if (!host)
goto fail;
host->max_id = 8;
esp = host_to_esp(host);
esp->host = host;
esp->dev = dev;
esp->ops = &jazz_esp_ops;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
goto fail_unlink;
esp->regs = (void __iomem *)res->start;
if (!esp->regs)
goto fail_unlink;
res = platform_get_resource(dev, IORESOURCE_MEM, 1);
if (!res)
goto fail_unlink;
esp->dma_regs = (void __iomem *)res->start;
esp->command_block = dma_alloc_coherent(esp->dev, 16,
&esp->command_block_dma,
GFP_KERNEL);
if (!esp->command_block)
goto fail_unmap_regs;
host->irq = platform_get_irq(dev, 0);
err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
if (err < 0)
goto fail_unmap_command_block;
esp->scsi_id = 7;
esp->host->this_id = esp->scsi_id;
esp->scsi_id_mask = (1 << esp->scsi_id);
esp->cfreq = 40000000;
dev_set_drvdata(&dev->dev, esp);
err = scsi_esp_register(esp, &dev->dev);
if (err)
goto fail_free_irq;
return 0;
fail_free_irq:
free_irq(host->irq, esp);
fail_unmap_command_block:
dma_free_coherent(esp->dev, 16,
esp->command_block,
esp->command_block_dma);
fail_unmap_regs:
fail_unlink:
scsi_host_put(host);
fail:
return err;
}
static int __devexit esp_jazz_remove(struct platform_device *dev)
{
struct esp *esp = dev_get_drvdata(&dev->dev);
unsigned int irq = esp->host->irq;
scsi_esp_unregister(esp);
free_irq(irq, esp);
dma_free_coherent(esp->dev, 16,
esp->command_block,
esp->command_block_dma);
scsi_host_put(esp->host);
return 0;
}
static struct platform_driver esp_jazz_driver = {
.probe = esp_jazz_probe,
.remove = __devexit_p(esp_jazz_remove),
.driver = {
.name = "jazz_esp",
},
};
static int __init jazz_esp_init(void)
{
return platform_driver_register(&esp_jazz_driver);
}
static void __exit jazz_esp_exit(void)
{
platform_driver_unregister(&esp_jazz_driver);
}
MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
module_init(jazz_esp_init);
module_exit(jazz_esp_exit);
|
