aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/misc/emi62.c
blob: 4e0f167a6c4ef49832bd1357517e738b397980a0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/* 
 * Emagic EMI 2|6 usb audio interface firmware loader.
 * Copyright (C) 2002
 * 	Tapio Laxström (tapio.laxstrom@iptime.fi)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, as published by
 * the Free Software Foundation, version 2.
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/ihex.h>

/* include firmware (variables)*/

/* FIXME: This is quick and dirty solution! */
#define SPDIF	/* if you want SPDIF comment next line */
//#undef SPDIF	/* if you want MIDI uncomment this line */ 

#ifdef SPDIF
#define FIRMWARE_FW "emi62/spdif.fw"
#else
#define FIRMWARE_FW "emi62/midi.fw"
#endif

#define EMI62_VENDOR_ID 		0x086a  /* Emagic Soft-und Hardware GmBH */
#define EMI62_PRODUCT_ID		0x0110	/* EMI 6|2m without firmware */

#define ANCHOR_LOAD_INTERNAL	0xA0	/* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
#define ANCHOR_LOAD_EXTERNAL	0xA3	/* This command is not implemented in the core. Requires firmware */
#define ANCHOR_LOAD_FPGA	0xA5	/* This command is not implemented in the core. Requires firmware. Emagic extension */
#define MAX_INTERNAL_ADDRESS	0x1B3F	/* This is the highest internal RAM address for the AN2131Q */
#define CPUCS_REG		0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */ 
#define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)

static int emi62_writememory(struct usb_device *dev, int address,
			     const unsigned char *data, int length,
			     __u8 bRequest);
static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
static int emi62_load_firmware (struct usb_device *dev);
static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id);
static void emi62_disconnect(struct usb_interface *intf);

/* thanks to drivers/usb/serial/keyspan_pda.c code */
static int emi62_writememory(struct usb_device *dev, int address,
			     const unsigned char *data, int length,
			     __u8 request)
{
	int result;
	unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);

	if (!buffer) {
		err("emi62: kmalloc(%d) failed.", length);
		return -ENOMEM;
	}
	/* Note: usb_control_msg returns negative value on error or length of the
	 * 		 data that was written! */
	result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
	kfree (buffer);
	return result;
}

/* thanks to drivers/usb/serial/keyspan_pda.c code */
static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
{
	int response;
	dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
	
	response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
	if (response < 0) {
		err("emi62: set_reset (%d) failed", reset_bit);
	}
	return response;
}

#define FW_LOAD_SIZE		1023

static int emi62_load_firmware (struct usb_device *dev)
{
	const struct firmware *loader_fw = NULL;
	const struct firmware *bitstream_fw = NULL;
	const struct firmware *firmware_fw = NULL;
	const struct ihex_binrec *rec;
	int err;
	int i;
	__u32 addr;	/* Address to write */
	__u8 *buf;

	dev_dbg(&dev->dev, "load_firmware\n");
	buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
	if (!buf) {
		err( "%s - error loading firmware: error = %d", __func__, -ENOMEM);
		err = -ENOMEM;
		goto wraperr;
	}

	err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev);
	if (err)
		goto nofw;

	err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw",
				    &dev->dev);
	if (err)
		goto nofw;

	err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
	if (err) {
	nofw:
		err( "%s - request_firmware() failed", __func__);
		goto wraperr;
	}

	/* Assert reset (stop the CPU in the EMI) */
	err = emi62_set_reset(dev,1);
	if (err < 0) {
		err("%s - error loading firmware: error = %d", __func__, err);
		goto wraperr;
	}

	rec = (const struct ihex_binrec *)loader_fw->data;

	/* 1. We need to put the loader for the FPGA into the EZ-USB */
	while (rec) {
		err = emi62_writememory(dev, be32_to_cpu(rec->addr),
					rec->data, be16_to_cpu(rec->len),
					ANCHOR_LOAD_INTERNAL);
		if (err < 0) {
			err("%s - error loading firmware: error = %d", __func__, err);
			goto wraperr;
		}
		rec = ihex_next_binrec(rec);
	}

	/* De-assert reset (let the CPU run) */
	err = emi62_set_reset(dev,0);
	if (err < 0) {
		err("%s - error loading firmware: error = %d", __func__, err);
		goto wraperr;
	}
	msleep(250);	/* let device settle */

	/* 2. We upload the FPGA firmware into the EMI
	 * Note: collect up to 1023 (yes!) bytes and send them with
	 * a single request. This is _much_ faster! */
	rec = (const struct ihex_binrec *)bitstream_fw->data;
	do {
		i = 0;
		addr = be32_to_cpu(rec->addr);

		/* intel hex records are terminated with type 0 element */
		while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
			memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
			i += be16_to_cpu(rec->len);
			rec = ihex_next_binrec(rec);
		}
		err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
		if (err < 0) {
			err("%s - error loading firmware: error = %d", __func__, err);
			goto wraperr;
		}
	} while (rec);

	/* Assert reset (stop the CPU in the EMI) */
	err = emi62_set_reset(dev,1);
	if (err < 0) {
		err("%s - error loading firmware: error = %d", __func__, err);
		goto wraperr;
	}

	/* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
	for (rec = (const struct ihex_binrec *)loader_fw->data;
	     rec; rec = ihex_next_binrec(rec)) {
		err = emi62_writememory(dev, be32_to_cpu(rec->addr),
					rec->data, be16_to_cpu(rec->len),
					ANCHOR_LOAD_INTERNAL);
		if (err < 0) {
			err("%s - error loading firmware: error = %d", __func__, err);
			goto wraperr;
		}
	}

	/* De-assert reset (let the CPU run) */
	err = emi62_set_reset(dev,0);
	if (err < 0) {
		err("%s - error loading firmware: error = %d", __func__, err);
		goto wraperr;
	}
	msleep(250);	/* let device settle */

	/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */

	for (rec = (const struct ihex_binrec *)firmware_fw->data;
	     rec; rec = ihex_next_binrec(rec)) {
		if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
			err = emi62_writememory(dev, be32_to_cpu(rec->addr),
						rec->data, be16_to_cpu(rec->len),
						ANCHOR_LOAD_EXTERNAL);
			if (err < 0) {
				err("%s - error loading firmware: error = %d", __func__, err);
				goto wraperr;
			}
		}
	}

	/* Assert reset (stop the CPU in the EMI) */
	err = emi62_set_reset(dev,1);
	if (err < 0) {
		err("%s - error loading firmware: error = %d", __func__, err);
		goto wraperr;
	}

	for (rec = (const struct ihex_binrec *)firmware_fw->data;
	     rec; rec = ihex_next_binrec(rec)) {
		if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
			err = emi62_writememory(dev, be32_to_cpu(rec->addr),
						rec->data, be16_to_cpu(rec->len),
						ANCHOR_LOAD_EXTERNAL);
			if (err < 0) {
				err("%s - error loading firmware: error = %d", __func__, err);
				goto wraperr;
			}
		}
	}

	/* De-assert reset (let the CPU run) */
	err = emi62_set_reset(dev,0);
	if (err < 0) {
		err("%s - error loading firmware: error = %d", __func__, err);
		goto wraperr;
	}
	msleep(250);	/* let device settle */

	release_firmware(loader_fw);
	release_firmware(bitstream_fw);
	release_firmware(firmware_fw);

	kfree(buf);

	/* return 1 to fail the driver inialization
	 * and give real driver change to load */
	return 1;

wraperr:
	release_firmware(loader_fw);
	release_firmware(bitstream_fw);
	release_firmware(firmware_fw);

	kfree(buf);
	dev_err(&dev->dev, "Error\n");
	return err;
}

static const struct usb_device_id id_table[] __devinitconst = {
	{ USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
	{ }                                             /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table);

static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	dev_dbg(&intf->dev, "emi62_probe\n");

	dev_info(&intf->dev, "%s start\n", __func__);

	emi62_load_firmware(dev);

	/* do not return the driver context, let real audio driver do that */
	return -EIO;
}

static void emi62_disconnect(struct usb_interface *intf)
{
}

static struct usb_driver emi62_driver = {
	.name		= "emi62 - firmware loader",
	.probe		= emi62_probe,
	.disconnect	= emi62_disconnect,
	.id_table	= id_table,
};

module_usb_driver(emi62_driver);

MODULE_AUTHOR("Tapio Laxström");
MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader.");
MODULE_LICENSE("GPL");

MODULE_FIRMWARE("emi62/loader.fw");
MODULE_FIRMWARE("emi62/bitstream.fw");
MODULE_FIRMWARE(FIRMWARE_FW);
/* vi:ai:syntax=c:sw=8:ts=8:tw=80
 */