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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 (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 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 = platform_get_irq(dev, 0);
147 err = request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
148 if (err < 0)
149 goto fail_unmap_command_block;
150
151 esp->scsi_id = 7;
152 esp->host->this_id = esp->scsi_id;
153 esp->scsi_id_mask = (1 << esp->scsi_id);
154 esp->cfreq = 40000000;
155
156 dev_set_drvdata(&dev->dev, esp);
157
158 err = scsi_esp_register(esp);
159 if (err)
160 goto fail_free_irq;
161
162 return 0;
163
164fail_free_irq:
165 free_irq(host->irq, esp);
166fail_unmap_command_block:
167 dma_free_coherent(esp->dev, 16,
168 esp->command_block,
169 esp->command_block_dma);
170fail_unmap_regs:
171fail_unlink:
172 scsi_host_put(host);
173fail:
174 return err;
175}
176
177static int esp_jazz_remove(struct platform_device *dev)
178{
179 struct esp *esp = dev_get_drvdata(&dev->dev);
180 unsigned int irq = esp->host->irq;
181
182 scsi_esp_unregister(esp);
183
184 free_irq(irq, esp);
185 dma_free_coherent(esp->dev, 16,
186 esp->command_block,
187 esp->command_block_dma);
188
189 scsi_host_put(esp->host);
190
191 return 0;
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};
204
205static int __init jazz_esp_init(void)
206{
207 return platform_driver_register(&esp_jazz_driver);
208}
209
210static void __exit jazz_esp_exit(void)
211{
212 platform_driver_unregister(&esp_jazz_driver);
213}
214
215MODULE_DESCRIPTION("JAZZ ESP SCSI driver");
216MODULE_AUTHOR("Thomas Bogendoerfer (tsbogend@alpha.franken.de)");
217MODULE_LICENSE("GPL");
218MODULE_VERSION(DRV_VERSION);
219
220module_init(jazz_esp_init);
221module_exit(jazz_esp_exit);
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);