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Linux/drivers/scsi/jazz_esp.c

  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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