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 Bogend��rfer (tsbogend@alpha.frankende)
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_new	= 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 <tsbogend@alpha.franken.de>");
208MODULE_LICENSE("GPL");
209MODULE_VERSION(DRV_VERSION);
210