1 /* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
3 * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/interrupt.h>
11 #include <linux/platform_device.h>
12 #include <linux/dma-mapping.h>
19 #include <asm/jazzdma.h>
21 #include <scsi/scsi_host.h>
25 #define DRV_MODULE_NAME "jazz_esp"
26 #define PFX DRV_MODULE_NAME ": "
27 #define DRV_VERSION "1.000"
28 #define DRV_MODULE_RELDATE "May 19, 2007"
30 static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
32 *(volatile u8 *)(esp->regs + reg) = val;
35 static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
37 return *(volatile u8 *)(esp->regs + reg);
40 static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf,
43 return dma_map_single(esp->dev, buf, sz, dir);
46 static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg,
49 return dma_map_sg(esp->dev, sg, num_sg, dir);
52 static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr,
55 dma_unmap_single(esp->dev, addr, sz, dir);
58 static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
61 dma_unmap_sg(esp->dev, sg, num_sg, dir);
64 static int jazz_esp_irq_pending(struct esp *esp)
66 if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
71 static void jazz_esp_reset_dma(struct esp *esp)
73 vdma_disable ((int)esp->dma_regs);
76 static void jazz_esp_dma_drain(struct esp *esp)
81 static void jazz_esp_dma_invalidate(struct esp *esp)
83 vdma_disable ((int)esp->dma_regs);
86 static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
87 u32 dma_count, int write, u8 cmd)
89 BUG_ON(!(cmd & ESP_CMD_DMA));
91 jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
92 jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
93 vdma_disable ((int)esp->dma_regs);
95 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
97 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
99 vdma_set_addr ((int)esp->dma_regs, addr);
100 vdma_set_count ((int)esp->dma_regs, dma_count);
101 vdma_enable ((int)esp->dma_regs);
103 scsi_esp_cmd(esp, cmd);
106 static int jazz_esp_dma_error(struct esp *esp)
108 u32 enable = vdma_get_enable((int)esp->dma_regs);
110 if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
116 static const struct esp_driver_ops jazz_esp_ops = {
117 .esp_write8 = jazz_esp_write8,
118 .esp_read8 = jazz_esp_read8,
119 .map_single = jazz_esp_map_single,
120 .map_sg = jazz_esp_map_sg,
121 .unmap_single = jazz_esp_unmap_single,
122 .unmap_sg = jazz_esp_unmap_sg,
123 .irq_pending = jazz_esp_irq_pending,
124 .reset_dma = jazz_esp_reset_dma,
125 .dma_drain = jazz_esp_dma_drain,
126 .dma_invalidate = jazz_esp_dma_invalidate,
127 .send_dma_cmd = jazz_esp_send_dma_cmd,
128 .dma_error = jazz_esp_dma_error,
131 static int __devinit esp_jazz_probe(struct platform_device *dev)
133 struct scsi_host_template *tpnt = &scsi_esp_template;
134 struct Scsi_Host *host;
136 struct resource *res;
139 host = scsi_host_alloc(tpnt, sizeof(struct esp));
146 esp = shost_priv(host);
150 esp->ops = &jazz_esp_ops;
152 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
156 esp->regs = (void __iomem *)res->start;
160 res = platform_get_resource(dev, IORESOURCE_MEM, 1);
164 esp->dma_regs = (void __iomem *)res->start;
166 esp->command_block = dma_alloc_coherent(esp->dev, 16,
167 &esp->command_block_dma,
169 if (!esp->command_block)
170 goto fail_unmap_regs;
172 host->irq = platform_get_irq(dev, 0);
173 err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
175 goto fail_unmap_command_block;
178 esp->host->this_id = esp->scsi_id;
179 esp->scsi_id_mask = (1 << esp->scsi_id);
180 esp->cfreq = 40000000;
182 dev_set_drvdata(&dev->dev, esp);
184 err = scsi_esp_register(esp, &dev->dev);
191 free_irq(host->irq, esp);
192 fail_unmap_command_block:
193 dma_free_coherent(esp->dev, 16,
195 esp->command_block_dma);
203 static int __devexit esp_jazz_remove(struct platform_device *dev)
205 struct esp *esp = dev_get_drvdata(&dev->dev);
206 unsigned int irq = esp->host->irq;
208 scsi_esp_unregister(esp);
211 dma_free_coherent(esp->dev, 16,
213 esp->command_block_dma);
215 scsi_host_put(esp->host);
220 /* work with hotplug and coldplug */
221 MODULE_ALIAS("platform:jazz_esp");
223 static struct platform_driver esp_jazz_driver = {
224 .probe = esp_jazz_probe,
225 .remove = __devexit_p(esp_jazz_remove),
228 .owner = THIS_MODULE,
232 static int __init jazz_esp_init(void)
234 return platform_driver_register(&esp_jazz_driver);
237 static void __exit jazz_esp_exit(void)
239 platform_driver_unregister(&esp_jazz_driver);
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);
247 module_init(jazz_esp_init);
248 module_exit(jazz_esp_exit);