Commit | Line | Data |
---|---|---|
352e921f | 1 | /* jazz_esp.c: ESP front-end for MIPS JAZZ systems. |
1da177e4 | 2 | * |
d36b6910 | 3 | * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende) |
1da177e4 LT |
4 | */ |
5 | ||
1da177e4 | 6 | #include <linux/kernel.h> |
5a0e3ad6 | 7 | #include <linux/gfp.h> |
1da177e4 | 8 | #include <linux/types.h> |
352e921f TB |
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> | |
1da177e4 LT |
14 | |
15 | #include <asm/irq.h> | |
352e921f TB |
16 | #include <asm/io.h> |
17 | #include <asm/dma.h> | |
18 | ||
1da177e4 LT |
19 | #include <asm/jazz.h> |
20 | #include <asm/jazzdma.h> | |
1da177e4 | 21 | |
352e921f | 22 | #include <scsi/scsi_host.h> |
1da177e4 | 23 | |
352e921f | 24 | #include "esp_scsi.h" |
1da177e4 | 25 | |
352e921f TB |
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" | |
1da177e4 | 30 | |
352e921f | 31 | static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg) |
1da177e4 | 32 | { |
352e921f | 33 | *(volatile u8 *)(esp->regs + reg) = val; |
1da177e4 LT |
34 | } |
35 | ||
352e921f | 36 | static u8 jazz_esp_read8(struct esp *esp, unsigned long reg) |
1da177e4 | 37 | { |
352e921f | 38 | return *(volatile u8 *)(esp->regs + reg); |
1da177e4 LT |
39 | } |
40 | ||
352e921f | 41 | static int jazz_esp_irq_pending(struct esp *esp) |
1da177e4 | 42 | { |
352e921f TB |
43 | if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR) |
44 | return 1; | |
45 | return 0; | |
1da177e4 LT |
46 | } |
47 | ||
352e921f | 48 | static void jazz_esp_reset_dma(struct esp *esp) |
1da177e4 | 49 | { |
352e921f | 50 | vdma_disable ((int)esp->dma_regs); |
1da177e4 LT |
51 | } |
52 | ||
352e921f | 53 | static void jazz_esp_dma_drain(struct esp *esp) |
1da177e4 | 54 | { |
352e921f | 55 | /* nothing to do */ |
1da177e4 LT |
56 | } |
57 | ||
352e921f | 58 | static void jazz_esp_dma_invalidate(struct esp *esp) |
1da177e4 | 59 | { |
352e921f | 60 | vdma_disable ((int)esp->dma_regs); |
1da177e4 LT |
61 | } |
62 | ||
352e921f TB |
63 | static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count, |
64 | u32 dma_count, int write, u8 cmd) | |
1da177e4 | 65 | { |
352e921f TB |
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); | |
1da177e4 LT |
81 | } |
82 | ||
352e921f | 83 | static int jazz_esp_dma_error(struct esp *esp) |
1da177e4 | 84 | { |
352e921f TB |
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; | |
1da177e4 LT |
91 | } |
92 | ||
352e921f TB |
93 | static const struct esp_driver_ops jazz_esp_ops = { |
94 | .esp_write8 = jazz_esp_write8, | |
95 | .esp_read8 = jazz_esp_read8, | |
352e921f TB |
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 | ||
6f039790 | 104 | static int esp_jazz_probe(struct platform_device *dev) |
1da177e4 | 105 | { |
352e921f TB |
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; | |
2b14ec78 | 119 | esp = shost_priv(host); |
352e921f TB |
120 | |
121 | esp->host = host; | |
e32ec657 | 122 | esp->dev = &dev->dev; |
352e921f TB |
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 | ||
44b1b4d2 | 157 | err = scsi_esp_register(esp); |
352e921f TB |
158 | if (err) |
159 | goto fail_free_irq; | |
160 | ||
161 | return 0; | |
162 | ||
163 | fail_free_irq: | |
164 | free_irq(host->irq, esp); | |
165 | fail_unmap_command_block: | |
166 | dma_free_coherent(esp->dev, 16, | |
167 | esp->command_block, | |
168 | esp->command_block_dma); | |
169 | fail_unmap_regs: | |
170 | fail_unlink: | |
171 | scsi_host_put(host); | |
172 | fail: | |
173 | return err; | |
1da177e4 LT |
174 | } |
175 | ||
6f039790 | 176 | static int esp_jazz_remove(struct platform_device *dev) |
1da177e4 | 177 | { |
352e921f TB |
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; | |
1da177e4 LT |
191 | } |
192 | ||
ecc1241e KS |
193 | /* work with hotplug and coldplug */ |
194 | MODULE_ALIAS("platform:jazz_esp"); | |
195 | ||
352e921f TB |
196 | static struct platform_driver esp_jazz_driver = { |
197 | .probe = esp_jazz_probe, | |
6f039790 | 198 | .remove = esp_jazz_remove, |
352e921f TB |
199 | .driver = { |
200 | .name = "jazz_esp", | |
201 | }, | |
202 | }; | |
1da177e4 | 203 | |
352e921f | 204 | static int __init jazz_esp_init(void) |
1da177e4 | 205 | { |
352e921f | 206 | return platform_driver_register(&esp_jazz_driver); |
1da177e4 LT |
207 | } |
208 | ||
352e921f TB |
209 | static void __exit jazz_esp_exit(void) |
210 | { | |
211 | platform_driver_unregister(&esp_jazz_driver); | |
1da177e4 LT |
212 | } |
213 | ||
352e921f TB |
214 | MODULE_DESCRIPTION("JAZZ ESP SCSI driver"); |
215 | MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)"); | |
216 | MODULE_LICENSE("GPL"); | |
217 | MODULE_VERSION(DRV_VERSION); | |
218 | ||
219 | module_init(jazz_esp_init); | |
220 | module_exit(jazz_esp_exit); |