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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 | .owner = THIS_MODULE, |
230 | }, |
231 | }; |
232 | |
233 | static int __init jazz_esp_init(void) |
234 | { |
235 | return platform_driver_register(&esp_jazz_driver); |
236 | } |
237 | |
238 | static void __exit jazz_esp_exit(void) |
239 | { |
240 | platform_driver_unregister(&esp_jazz_driver); |
241 | } |
242 | |
243 | MODULE_DESCRIPTION("JAZZ ESP SCSI driver"); |
244 | MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)"); |
245 | MODULE_LICENSE("GPL"); |
246 | MODULE_VERSION(DRV_VERSION); |
247 | |
248 | module_init(jazz_esp_init); |
249 | module_exit(jazz_esp_exit); |
250 |
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