1 /*
2 * Broadcom B43 wireless driver
3 *
4 * SDIO over Sonics Silicon Backplane bus glue for b43.
5 *
6 * Copyright (C) 2009 Albert Herranz
7 * Copyright (C) 2009 Michael Buesch <m@bues.ch>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/sdio_func.h>
18 #include <linux/mmc/sdio_ids.h>
19 #include <linux/slab.h>
20 #include <linux/ssb/ssb.h>
21
22 #include "sdio.h"
23 #include "b43.h"
24
25
26 #define HNBU_CHIPID 0x01 /* vendor & device id */
27
28 #define B43_SDIO_BLOCK_SIZE 64 /* rx fifo max size in bytes */
29
30
31 static const struct b43_sdio_quirk {
32 u16 vendor;
33 u16 device;
34 unsigned int quirks;
35 } b43_sdio_quirks[] = {
36 { 0x14E4, 0x4318, SSB_QUIRK_SDIO_READ_AFTER_WRITE32, },
37 { },
38 };
39
40
b43_sdio_get_quirks(u16 vendor,u16 device)41 static unsigned int b43_sdio_get_quirks(u16 vendor, u16 device)
42 {
43 const struct b43_sdio_quirk *q;
44
45 for (q = b43_sdio_quirks; q->quirks; q++) {
46 if (vendor == q->vendor && device == q->device)
47 return q->quirks;
48 }
49
50 return 0;
51 }
52
b43_sdio_interrupt_dispatcher(struct sdio_func * func)53 static void b43_sdio_interrupt_dispatcher(struct sdio_func *func)
54 {
55 struct b43_sdio *sdio = sdio_get_drvdata(func);
56 struct b43_wldev *dev = sdio->irq_handler_opaque;
57
58 if (unlikely(b43_status(dev) < B43_STAT_STARTED))
59 return;
60
61 sdio_release_host(func);
62 sdio->irq_handler(dev);
63 sdio_claim_host(func);
64 }
65
b43_sdio_request_irq(struct b43_wldev * dev,void (* handler)(struct b43_wldev * dev))66 int b43_sdio_request_irq(struct b43_wldev *dev,
67 void (*handler)(struct b43_wldev *dev))
68 {
69 struct ssb_bus *bus = dev->dev->sdev->bus;
70 struct sdio_func *func = bus->host_sdio;
71 struct b43_sdio *sdio = sdio_get_drvdata(func);
72 int err;
73
74 sdio->irq_handler_opaque = dev;
75 sdio->irq_handler = handler;
76 sdio_claim_host(func);
77 err = sdio_claim_irq(func, b43_sdio_interrupt_dispatcher);
78 sdio_release_host(func);
79
80 return err;
81 }
82
b43_sdio_free_irq(struct b43_wldev * dev)83 void b43_sdio_free_irq(struct b43_wldev *dev)
84 {
85 struct ssb_bus *bus = dev->dev->sdev->bus;
86 struct sdio_func *func = bus->host_sdio;
87 struct b43_sdio *sdio = sdio_get_drvdata(func);
88
89 sdio_claim_host(func);
90 sdio_release_irq(func);
91 sdio_release_host(func);
92 sdio->irq_handler_opaque = NULL;
93 sdio->irq_handler = NULL;
94 }
95
b43_sdio_probe(struct sdio_func * func,const struct sdio_device_id * id)96 static int b43_sdio_probe(struct sdio_func *func,
97 const struct sdio_device_id *id)
98 {
99 struct b43_sdio *sdio;
100 struct sdio_func_tuple *tuple;
101 u16 vendor = 0, device = 0;
102 int error;
103
104 /* Look for the card chip identifier. */
105 tuple = func->tuples;
106 while (tuple) {
107 switch (tuple->code) {
108 case 0x80:
109 switch (tuple->data[0]) {
110 case HNBU_CHIPID:
111 if (tuple->size != 5)
112 break;
113 vendor = tuple->data[1] | (tuple->data[2]<<8);
114 device = tuple->data[3] | (tuple->data[4]<<8);
115 dev_info(&func->dev, "Chip ID %04x:%04x\n",
116 vendor, device);
117 break;
118 default:
119 break;
120 }
121 break;
122 default:
123 break;
124 }
125 tuple = tuple->next;
126 }
127 if (!vendor || !device) {
128 error = -ENODEV;
129 goto out;
130 }
131
132 sdio_claim_host(func);
133 error = sdio_set_block_size(func, B43_SDIO_BLOCK_SIZE);
134 if (error) {
135 dev_err(&func->dev, "failed to set block size to %u bytes,"
136 " error %d\n", B43_SDIO_BLOCK_SIZE, error);
137 goto err_release_host;
138 }
139 error = sdio_enable_func(func);
140 if (error) {
141 dev_err(&func->dev, "failed to enable func, error %d\n", error);
142 goto err_release_host;
143 }
144 sdio_release_host(func);
145
146 sdio = kzalloc(sizeof(*sdio), GFP_KERNEL);
147 if (!sdio) {
148 error = -ENOMEM;
149 dev_err(&func->dev, "failed to allocate ssb bus\n");
150 goto err_disable_func;
151 }
152 error = ssb_bus_sdiobus_register(&sdio->ssb, func,
153 b43_sdio_get_quirks(vendor, device));
154 if (error) {
155 dev_err(&func->dev, "failed to register ssb sdio bus,"
156 " error %d\n", error);
157 goto err_free_ssb;
158 }
159 sdio_set_drvdata(func, sdio);
160
161 return 0;
162
163 err_free_ssb:
164 kfree(sdio);
165 err_disable_func:
166 sdio_claim_host(func);
167 sdio_disable_func(func);
168 err_release_host:
169 sdio_release_host(func);
170 out:
171 return error;
172 }
173
b43_sdio_remove(struct sdio_func * func)174 static void b43_sdio_remove(struct sdio_func *func)
175 {
176 struct b43_sdio *sdio = sdio_get_drvdata(func);
177
178 ssb_bus_unregister(&sdio->ssb);
179 sdio_claim_host(func);
180 sdio_disable_func(func);
181 sdio_release_host(func);
182 kfree(sdio);
183 sdio_set_drvdata(func, NULL);
184 }
185
186 static const struct sdio_device_id b43_sdio_ids[] = {
187 { SDIO_DEVICE(0x02d0, 0x044b) }, /* Nintendo Wii WLAN daughter card */
188 { SDIO_DEVICE(0x0092, 0x0004) }, /* C-guys, Inc. EW-CG1102GC */
189 { },
190 };
191
192 static struct sdio_driver b43_sdio_driver = {
193 .name = "b43-sdio",
194 .id_table = b43_sdio_ids,
195 .probe = b43_sdio_probe,
196 .remove = b43_sdio_remove,
197 };
198
b43_sdio_init(void)199 int b43_sdio_init(void)
200 {
201 return sdio_register_driver(&b43_sdio_driver);
202 }
203
b43_sdio_exit(void)204 void b43_sdio_exit(void)
205 {
206 sdio_unregister_driver(&b43_sdio_driver);
207 }
208