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

Warning: That file was not part of the compilation database. It may have many parsing errors.