ARC: ioremap: use more commonly used PAGE_KERNEL based uncached flag
[linux-2.6-microblaze.git] / drivers / scsi / jazz_esp.c
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
32 static void jazz_esp_write8(struct esp *esp, u8 val, unsigned long reg)
33 {
34         *(volatile u8 *)(esp->regs + reg) = val;
35 }
36
37 static u8 jazz_esp_read8(struct esp *esp, unsigned long reg)
38 {
39         return *(volatile u8 *)(esp->regs + reg);
40 }
41
42 static 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
49 static void jazz_esp_reset_dma(struct esp *esp)
50 {
51         vdma_disable ((int)esp->dma_regs);
52 }
53
54 static void jazz_esp_dma_drain(struct esp *esp)
55 {
56         /* nothing to do */
57 }
58
59 static void jazz_esp_dma_invalidate(struct esp *esp)
60 {
61         vdma_disable ((int)esp->dma_regs);
62 }
63
64 static 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
84 static 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
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,
103 };
104
105 static 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 = 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
166 fail_free_irq:
167         free_irq(host->irq, esp);
168 fail_unmap_command_block:
169         dma_free_coherent(esp->dev, 16,
170                           esp->command_block,
171                           esp->command_block_dma);
172 fail_unmap_regs:
173 fail_unlink:
174         scsi_host_put(host);
175 fail:
176         return err;
177 }
178
179 static int 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         return 0;
194 }
195
196 /* work with hotplug and coldplug */
197 MODULE_ALIAS("platform:jazz_esp");
198
199 static struct platform_driver esp_jazz_driver = {
200         .probe          = esp_jazz_probe,
201         .remove         = esp_jazz_remove,
202         .driver = {
203                 .name   = "jazz_esp",
204         },
205 };
206 module_platform_driver(esp_jazz_driver);
207
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);