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1// SPDX-License-Identifier: GPL-2.0-only
2/* jazz_esp.c: ESP front-end for MIPS JAZZ systems.
3 *
4 * Copyright (C) 2007 Thomas Bogendörfer ([email protected])
5 */
6
7#include <linux/kernel.h>
8#include <linux/gfp.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>
15
16#include <asm/irq.h>
17#include <asm/io.h>
18#include <asm/dma.h>
19
20#include <asm/jazz.h>
21#include <asm/jazzdma.h>
22
23#include <scsi/scsi_host.h>
24
25#include "esp_scsi.h"
26
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"
31
32static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
33{
34 *(volatile u8 *)(esp->regs + reg) = val;
35}
36
37static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
38{
39 return *(volatile u8 *)(esp->regs + reg);
40}
41
42static int jazz_esp_irq_pending(struct esp *esp)
43{
44 if (jazz_esp_read8(esp, ESP_STATUS) & ESP_STAT_INTR)
45 return 1;
46 return 0;
47}
48
49static void jazz_esp_reset_dma(struct esp *esp)
50{
51 vdma_disable ((int)esp->dma_regs);
52}
53
54static void jazz_esp_dma_drain(struct esp *esp)
55{
56 /* nothing to do */
57}
58
59static void jazz_esp_dma_invalidate(struct esp *esp)
60{
61 vdma_disable ((int)esp->dma_regs);
62}
63
64static void jazz_esp_send_dma_cmd(struct esp *esp, u32 addr, u32 esp_count,
65 u32 dma_count, int write, u8 cmd)
66{
67 BUG_ON(!(cmd & ESP_CMD_DMA));
68
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);
72 if (write)
73 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_READ);
74 else
75 vdma_set_mode ((int)esp->dma_regs, DMA_MODE_WRITE);
76
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);
80
81 scsi_esp_cmd(esp, cmd);
82}
83
84static int jazz_esp_dma_error(struct esp *esp)
85{
86 u32 enable = vdma_get_enable((int)esp->dma_regs);
87
88 if (enable & (R4030_MEM_INTR|R4030_ADDR_INTR))
89 return 1;
90
91 return 0;
92}
93
94static 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,
103};
104
105static int esp_jazz_probe(struct platform_device *dev)
106{
107 const struct scsi_host_template *tpnt = &scsi_esp_template;
108 struct Scsi_Host *host;
109 struct esp *esp;
110 struct resource *res;
111 int err;
112
113 host = scsi_host_alloc(tpnt, sizeof(struct esp));
114
115 err = -ENOMEM;
116 if (!host)
117 goto fail;
118
119 host->max_id = 8;
120 esp = shost_priv(host);
121
122 esp->host = host;
123 esp->dev = &dev->dev;
124 esp->ops = &jazz_esp_ops;
125
126 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
127 if (!res)
128 goto fail_unlink;
129
130 esp->regs = (void __iomem *)res->start;
131 if (!esp->regs)
132 goto fail_unlink;
133
134 res = platform_get_resource(dev, IORESOURCE_MEM, 1);
135 if (!res)
136 goto fail_unlink;
137
138 esp->dma_regs = (void __iomem *)res->start;
139
140 esp->command_block = dma_alloc_coherent(esp->dev, 16,
141 &esp->command_block_dma,
142 GFP_KERNEL);
143 if (!esp->command_block)
144 goto fail_unmap_regs;
145
146 host->irq = err = platform_get_irq(dev, 0);
147 if (err < 0)
148 goto fail_unmap_command_block;
149 err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
150 if (err < 0)
151 goto fail_unmap_command_block;
152
153 esp->scsi_id = 7;
154 esp->host->this_id = esp->scsi_id;
155 esp->scsi_id_mask = (1 << esp->scsi_id);
156 esp->cfreq = 40000000;
157
158 dev_set_drvdata(&dev->dev, esp);
159
160 err = scsi_esp_register(esp);
161 if (err)
162 goto fail_free_irq;
163
164 return 0;
165
166fail_free_irq:
167 free_irq(host->irq, esp);
168fail_unmap_command_block:
169 dma_free_coherent(esp->dev, 16,
170 esp->command_block,
171 esp->command_block_dma);
172fail_unmap_regs:
173fail_unlink:
174 scsi_host_put(host);
175fail:
176 return err;
177}
178
179static void esp_jazz_remove(struct platform_device *dev)
180{
181 struct esp *esp = dev_get_drvdata(&dev->dev);
182 unsigned int irq = esp->host->irq;
183
184 scsi_esp_unregister(esp);
185
186 free_irq(irq, esp);
187 dma_free_coherent(esp->dev, 16,
188 esp->command_block,
189 esp->command_block_dma);
190
191 scsi_host_put(esp->host);
192}
193
194/* work with hotplug and coldplug */
195MODULE_ALIAS("platform:jazz_esp");
196
197static struct platform_driver esp_jazz_driver = {
198 .probe = esp_jazz_probe,
199 .remove = esp_jazz_remove,
200 .driver = {
201 .name = "jazz_esp",
202 },
203};
204module_platform_driver(esp_jazz_driver);
205
206MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
207MODULE_AUTHOR("Thomas Bogendoerfer <[email protected]>");
208MODULE_LICENSE("GPL");
209MODULE_VERSION(DRV_VERSION);