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
31static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
32{
33	*(volatile u8 *)(esp->regs + reg) = val;
34}
35
36static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
37{
38	return *(volatile u8 *)(esp->regs + reg);
39}
40
41static 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
47static 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
53static 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
59static 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
65static 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
72static void jazz_esp_reset_dma(struct esp *esp)
73{
74	vdma_disable ((int)esp->dma_regs);
75}
76
77static void jazz_esp_dma_drain(struct esp *esp)
78{
79	/* nothing to do */
80}
81
82static void jazz_esp_dma_invalidate(struct esp *esp)
83{
84	vdma_disable ((int)esp->dma_regs);
85}
86
87static 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
107static 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
117static 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
132static 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
191fail_free_irq:
192	free_irq(host->irq, esp);
193fail_unmap_command_block:
194	dma_free_coherent(esp->dev, 16,
195			  esp->command_block,
196			  esp->command_block_dma);
197fail_unmap_regs:
198fail_unlink:
199	scsi_host_put(host);
200fail:
201	return err;
202}
203
204static 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 */
222MODULE_ALIAS("platform:jazz_esp");
223
224static 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
233static int __init jazz_esp_init(void)
234{
235	return platform_driver_register(&esp_jazz_driver);
236}
237
238static void __exit jazz_esp_exit(void)
239{
240	platform_driver_unregister(&esp_jazz_driver);
241}
242
243MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
244MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
245MODULE_LICENSE("GPL");
246MODULE_VERSION(DRV_VERSION);
247
248module_init(jazz_esp_init);
249module_exit(jazz_esp_exit);
250