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>
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>
20 #include <asm/jazzdma.h>
22 #include <scsi/scsi_host.h>
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"
31 static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
33 *(volatile u8 *)(esp->regs + reg) = val;
36 static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
38 return *(volatile u8 *)(esp->regs + reg);
41 static dma_addr_t jazz_esp_map_single(struct esp *esp, void *buf,
44 return dma_map_single(esp->dev, buf, sz, dir);
47 static int jazz_esp_map_sg(struct esp *esp, struct scatterlist *sg,
50 return dma_map_sg(esp->dev, sg, num_sg, dir);
53 static void jazz_esp_unmap_single(struct esp *esp, dma_addr_t addr,
56 dma_unmap_single(esp->dev, addr, sz, dir);
59 static void jazz_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
62 dma_unmap_sg(esp->dev, sg, num_sg, dir);
65 static int jazz_esp_irq_pending(struct esp *esp)
67 if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
72 static void jazz_esp_reset_dma(struct esp *esp)
74 vdma_disable ((int)esp->dma_regs);
77 static void jazz_esp_dma_drain(struct esp *esp)
82 static void jazz_esp_dma_invalidate(struct esp *esp)
84 vdma_disable ((int)esp->dma_regs);
87 static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
88 u32 dma_count, int write, u8 cmd)
90 BUG_ON(!(cmd & ESP_CMD_DMA));
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);
96 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
98 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
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);
104 scsi_esp_cmd(esp, cmd);
107 static int jazz_esp_dma_error(struct esp *esp)
109 u32 enable = vdma_get_enable((int)esp->dma_regs);
111 if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
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,
132 static int esp_jazz_probe(struct platform_device *dev)
134 struct scsi_host_template *tpnt = &scsi_esp_template;
135 struct Scsi_Host *host;
137 struct resource *res;
140 host = scsi_host_alloc(tpnt, sizeof(struct esp));
147 esp = shost_priv(host);
151 esp->ops = &jazz_esp_ops;
153 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
157 esp->regs = (void __iomem *)res->start;
161 res = platform_get_resource(dev, IORESOURCE_MEM, 1);
165 esp->dma_regs = (void __iomem *)res->start;
167 esp->command_block = dma_alloc_coherent(esp->dev, 16,
168 &esp->command_block_dma,
170 if (!esp->command_block)
171 goto fail_unmap_regs;
173 host->irq = platform_get_irq(dev, 0);
174 err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
176 goto fail_unmap_command_block;
179 esp->host->this_id = esp->scsi_id;
180 esp->scsi_id_mask = (1 << esp->scsi_id);
181 esp->cfreq = 40000000;
183 dev_set_drvdata(&dev->dev, esp);
185 err = scsi_esp_register(esp, &dev->dev);
192 free_irq(host->irq, esp);
193 fail_unmap_command_block:
194 dma_free_coherent(esp->dev, 16,
196 esp->command_block_dma);
204 static int esp_jazz_remove(struct platform_device *dev)
206 struct esp *esp = dev_get_drvdata(&dev->dev);
207 unsigned int irq = esp->host->irq;
209 scsi_esp_unregister(esp);
212 dma_free_coherent(esp->dev, 16,
214 esp->command_block_dma);
216 scsi_host_put(esp->host);
221 /* work with hotplug and coldplug */
222 MODULE_ALIAS("platform:jazz_esp");
224 static struct platform_driver esp_jazz_driver = {
225 .probe = esp_jazz_probe,
226 .remove = esp_jazz_remove,
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);