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, val: (esp_count >> 0) & 0xff, ESP_TCLOW); |
70 | jazz_esp_write8(esp, val: (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 | 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(shost: 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(dev: esp->dev, size: 16, |
141 | dma_handle: &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(irq: host->irq, handler: scsi_esp_intr, IRQF_SHARED, name: "ESP" , dev: 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->dev, data: 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(dev: esp->dev, size: 16, |
170 | cpu_addr: esp->command_block, |
171 | dma_handle: esp->command_block_dma); |
172 | fail_unmap_regs: |
173 | fail_unlink: |
174 | scsi_host_put(t: host); |
175 | fail: |
176 | return err; |
177 | } |
178 | |
179 | static void esp_jazz_remove(struct platform_device *dev) |
180 | { |
181 | struct esp *esp = dev_get_drvdata(dev: &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(dev: esp->dev, size: 16, |
188 | cpu_addr: esp->command_block, |
189 | dma_handle: esp->command_block_dma); |
190 | |
191 | scsi_host_put(t: esp->host); |
192 | } |
193 | |
194 | /* work with hotplug and coldplug */ |
195 | MODULE_ALIAS("platform:jazz_esp" ); |
196 | |
197 | static 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 | }; |
204 | module_platform_driver(esp_jazz_driver); |
205 | |
206 | MODULE_DESCRIPTION("JAZZ ESP SCSI driver" ); |
207 | MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>" ); |
208 | MODULE_LICENSE("GPL" ); |
209 | MODULE_VERSION(DRV_VERSION); |
210 | |