1 // SPDX-License-Identifier: GPL-2.0-only
2 /* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
4 * Copyright (C) 2007 Thomas Bogendörfer (tsbogend@alpha.frankende)
7 #include <linux/kernel.h>
9 #include <linux/types.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/platform_device.h>
14 #include <linux/dma-mapping.h>
21 #include <asm/jazzdma.h>
23 #include <scsi/scsi_host.h>
27 #define DRV_MODULE_NAME "jazz_esp"
28 #define PFX DRV_MODULE_NAME ": "
29 #define DRV_VERSION "1.000"
30 #define DRV_MODULE_RELDATE "May 19, 2007"
32 static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
34 *(volatile u8 *)(esp->regs + reg) = val;
37 static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
39 return *(volatile u8 *)(esp->regs + reg);
42 static int jazz_esp_irq_pending(struct esp *esp)
44 if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
49 static void jazz_esp_reset_dma(struct esp *esp)
51 vdma_disable ((int)esp->dma_regs);
54 static void jazz_esp_dma_drain(struct esp *esp)
59 static void jazz_esp_dma_invalidate(struct esp *esp)
61 vdma_disable ((int)esp->dma_regs);
64 static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
65 u32 dma_count, int write, u8 cmd)
67 BUG_ON(!(cmd & ESP_CMD_DMA));
69 jazz_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
70 jazz_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
71 vdma_disable ((int)esp->dma_regs);
73 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
75 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
77 vdma_set_addr ((int)esp->dma_regs, addr);
78 vdma_set_count ((int)esp->dma_regs, dma_count);
79 vdma_enable ((int)esp->dma_regs);
81 scsi_esp_cmd(esp, cmd);
84 static int jazz_esp_dma_error(struct esp *esp)
86 u32 enable = vdma_get_enable((int)esp->dma_regs);
88 if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
94 static const struct esp_driver_ops jazz_esp_ops = {
95 .esp_write8 = jazz_esp_write8,
96 .esp_read8 = jazz_esp_read8,
97 .irq_pending = jazz_esp_irq_pending,
98 .reset_dma = jazz_esp_reset_dma,
99 .dma_drain = jazz_esp_dma_drain,
100 .dma_invalidate = jazz_esp_dma_invalidate,
101 .send_dma_cmd = jazz_esp_send_dma_cmd,
102 .dma_error = jazz_esp_dma_error,
105 static int esp_jazz_probe(struct platform_device *dev)
107 struct scsi_host_template *tpnt = &scsi_esp_template;
108 struct Scsi_Host *host;
110 struct resource *res;
113 host = scsi_host_alloc(tpnt, sizeof(struct esp));
120 esp = shost_priv(host);
123 esp->dev = &dev->dev;
124 esp->ops = &jazz_esp_ops;
126 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
130 esp->regs = (void __iomem *)res->start;
134 res = platform_get_resource(dev, IORESOURCE_MEM, 1);
138 esp->dma_regs = (void __iomem *)res->start;
140 esp->command_block = dma_alloc_coherent(esp->dev, 16,
141 &esp->command_block_dma,
143 if (!esp->command_block)
144 goto fail_unmap_regs;
146 host->irq = err = platform_get_irq(dev, 0);
148 goto fail_unmap_command_block;
149 err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
151 goto fail_unmap_command_block;
154 esp->host->this_id = esp->scsi_id;
155 esp->scsi_id_mask = (1 << esp->scsi_id);
156 esp->cfreq = 40000000;
158 dev_set_drvdata(&dev->dev, esp);
160 err = scsi_esp_register(esp);
167 free_irq(host->irq, esp);
168 fail_unmap_command_block:
169 dma_free_coherent(esp->dev, 16,
171 esp->command_block_dma);
179 static int esp_jazz_remove(struct platform_device *dev)
181 struct esp *esp = dev_get_drvdata(&dev->dev);
182 unsigned int irq = esp->host->irq;
184 scsi_esp_unregister(esp);
187 dma_free_coherent(esp->dev, 16,
189 esp->command_block_dma);
191 scsi_host_put(esp->host);
196 /* work with hotplug and coldplug */
197 MODULE_ALIAS("platform:jazz_esp");
199 static struct platform_driver esp_jazz_driver = {
200 .probe = esp_jazz_probe,
201 .remove = esp_jazz_remove,
206 module_platform_driver(esp_jazz_driver);
208 MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
209 MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
210 MODULE_LICENSE("GPL");
211 MODULE_VERSION(DRV_VERSION);