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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 | ||
31 | static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg) | |
32 | { | |
33 | *(volatile u8 *)(esp->regs + reg) = val; | |
34 | } | |
35 | ||
36 | static u8 jazz_esp_read8(struct esp *esp, unsigned long reg) | |
37 | { | |
38 | return *(volatile u8 *)(esp->regs + reg); | |
39 | } | |
40 | ||
41 | static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf, | |
42 | size_t sz, int dir) | |
43 | { | |
44 | return dma_map_single(esp->dev, buf, sz, dir); | |
45 | } | |
46 | ||
47 | static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg, | |
48 | int num_sg, int dir) | |
49 | { | |
50 | return dma_map_sg(esp->dev, sg, num_sg, dir); | |
51 | } | |
52 | ||
53 | static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr, | |
54 | size_t sz, int dir) | |
55 | { | |
56 | dma_unmap_single(esp->dev, addr, sz, dir); | |
57 | } | |
58 | ||
59 | static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg, | |
60 | int num_sg, int dir) | |
61 | { | |
62 | dma_unmap_sg(esp->dev, sg, num_sg, dir); | |
63 | } | |
64 | ||
65 | static int jazz_esp_irq_pending(struct esp *esp) | |
66 | { | |
67 | if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR) | |
68 | return 1; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static void jazz_esp_reset_dma(struct esp *esp) | |
73 | { | |
74 | vdma_disable ((int)esp->dma_regs); | |
75 | } | |
76 | ||
77 | static void jazz_esp_dma_drain(struct esp *esp) | |
78 | { | |
79 | /* nothing to do */ | |
80 | } | |
81 | ||
82 | static void jazz_esp_dma_invalidate(struct esp *esp) | |
83 | { | |
84 | vdma_disable ((int)esp->dma_regs); | |
85 | } | |
86 | ||
87 | static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count, | |
88 | u32 dma_count, int write, u8 cmd) | |
89 | { | |
90 | BUG_ON(!(cmd & ESP_CMD_DMA)); | |
91 | ||
92 | jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW); | |
93 | jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED); | |
94 | vdma_disable ((int)esp->dma_regs); | |
95 | if (write) | |
96 | vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ); | |
97 | else | |
98 | vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE); | |
99 | ||
100 | vdma_set_addr ((int)esp->dma_regs, addr); | |
101 | vdma_set_count ((int)esp->dma_regs, dma_count); | |
102 | vdma_enable ((int)esp->dma_regs); | |
103 | ||
104 | scsi_esp_cmd(esp, cmd); | |
105 | } | |
106 | ||
107 | static int jazz_esp_dma_error(struct esp *esp) | |
108 | { | |
109 | u32 enable = vdma_get_enable((int)esp->dma_regs); | |
110 | ||
111 | if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR)) | |
112 | return 1; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static const struct esp_driver_ops jazz_esp_ops = { | |
118 | .esp_write8 = jazz_esp_write8, | |
119 | .esp_read8 = jazz_esp_read8, | |
120 | .map_single = jazz_esp_map_single, | |
121 | .map_sg = jazz_esp_map_sg, | |
122 | .unmap_single = jazz_esp_unmap_single, | |
123 | .unmap_sg = jazz_esp_unmap_sg, | |
124 | .irq_pending = jazz_esp_irq_pending, | |
125 | .reset_dma = jazz_esp_reset_dma, | |
126 | .dma_drain = jazz_esp_dma_drain, | |
127 | .dma_invalidate = jazz_esp_dma_invalidate, | |
128 | .send_dma_cmd = jazz_esp_send_dma_cmd, | |
129 | .dma_error = jazz_esp_dma_error, | |
130 | }; | |
131 | ||
132 | static int esp_jazz_probe(struct platform_device *dev) | |
133 | { | |
134 | struct scsi_host_template *tpnt = &scsi_esp_template; | |
135 | struct Scsi_Host *host; | |
136 | struct esp *esp; | |
137 | struct resource *res; | |
138 | int err; | |
139 | ||
140 | host = scsi_host_alloc(tpnt, sizeof(struct esp)); | |
141 | ||
142 | err = -ENOMEM; | |
143 | if (!host) | |
144 | goto fail; | |
145 | ||
146 | host->max_id = 8; | |
147 | esp = shost_priv(host); | |
148 | ||
149 | esp->host = host; | |
150 | esp->dev = dev; | |
151 | esp->ops = &jazz_esp_ops; | |
152 | ||
153 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
154 | if (!res) | |
155 | goto fail_unlink; | |
156 | ||
157 | esp->regs = (void __iomem *)res->start; | |
158 | if (!esp->regs) | |
159 | goto fail_unlink; | |
160 | ||
161 | res = platform_get_resource(dev, IORESOURCE_MEM, 1); | |
162 | if (!res) | |
163 | goto fail_unlink; | |
164 | ||
165 | esp->dma_regs = (void __iomem *)res->start; | |
166 | ||
167 | esp->command_block = dma_alloc_coherent(esp->dev, 16, | |
168 | &esp->command_block_dma, | |
169 | GFP_KERNEL); | |
170 | if (!esp->command_block) | |
171 | goto fail_unmap_regs; | |
172 | ||
173 | host->irq = platform_get_irq(dev, 0); | |
174 | err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp); | |
175 | if (err < 0) | |
176 | goto fail_unmap_command_block; | |
177 | ||
178 | esp->scsi_id = 7; | |
179 | esp->host->this_id = esp->scsi_id; | |
180 | esp->scsi_id_mask = (1 << esp->scsi_id); | |
181 | esp->cfreq = 40000000; | |
182 | ||
183 | dev_set_drvdata(&dev->dev, esp); | |
184 | ||
185 | err = scsi_esp_register(esp, &dev->dev); | |
186 | if (err) | |
187 | goto fail_free_irq; | |
188 | ||
189 | return 0; | |
190 | ||
191 | fail_free_irq: | |
192 | free_irq(host->irq, esp); | |
193 | fail_unmap_command_block: | |
194 | dma_free_coherent(esp->dev, 16, | |
195 | esp->command_block, | |
196 | esp->command_block_dma); | |
197 | fail_unmap_regs: | |
198 | fail_unlink: | |
199 | scsi_host_put(host); | |
200 | fail: | |
201 | return err; | |
202 | } | |
203 | ||
204 | static int esp_jazz_remove(struct platform_device *dev) | |
205 | { | |
206 | struct esp *esp = dev_get_drvdata(&dev->dev); | |
207 | unsigned int irq = esp->host->irq; | |
208 | ||
209 | scsi_esp_unregister(esp); | |
210 | ||
211 | free_irq(irq, esp); | |
212 | dma_free_coherent(esp->dev, 16, | |
213 | esp->command_block, | |
214 | esp->command_block_dma); | |
215 | ||
216 | scsi_host_put(esp->host); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | /* work with hotplug and coldplug */ | |
222 | MODULE_ALIAS("platform:jazz_esp"); | |
223 | ||
224 | static struct platform_driver esp_jazz_driver = { | |
225 | .probe = esp_jazz_probe, | |
226 | .remove = esp_jazz_remove, | |
227 | .driver = { | |
228 | .name = "jazz_esp", | |
229 | }, | |
230 | }; | |
231 | ||
232 | static int __init jazz_esp_init(void) | |
233 | { | |
234 | return platform_driver_register(&esp_jazz_driver); | |
235 | } | |
236 | ||
237 | static void __exit jazz_esp_exit(void) | |
238 | { | |
239 | platform_driver_unregister(&esp_jazz_driver); | |
240 | } | |
241 | ||
242 | MODULE_DESCRIPTION("JAZZ ESP SCSI driver"); | |
243 | MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)"); | |
244 | MODULE_LICENSE("GPL"); | |
245 | MODULE_VERSION(DRV_VERSION); | |
246 | ||
247 | module_init(jazz_esp_init); | |
248 | module_exit(jazz_esp_exit); |