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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Emagic EMI 2|6 usb audio interface firmware loader.
4 * Copyright (C) 2002
5 * Tapio Laxström ([email protected])
6 */
7#include <linux/kernel.h>
8#include <linux/errno.h>
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/usb.h>
12#include <linux/delay.h>
13#include <linux/firmware.h>
14#include <linux/ihex.h>
15
16/* include firmware (variables)*/
17
18/* FIXME: This is quick and dirty solution! */
19#define SPDIF /* if you want SPDIF comment next line */
20//#undef SPDIF /* if you want MIDI uncomment this line */
21
22#ifdef SPDIF
23#define FIRMWARE_FW "emi62/spdif.fw"
24#else
25#define FIRMWARE_FW "emi62/midi.fw"
26#endif
27
28#define EMI62_VENDOR_ID 0x086a /* Emagic Soft-und Hardware GmBH */
29#define EMI62_PRODUCT_ID 0x0110 /* EMI 6|2m without firmware */
30
31#define ANCHOR_LOAD_INTERNAL 0xA0 /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
32#define ANCHOR_LOAD_EXTERNAL 0xA3 /* This command is not implemented in the core. Requires firmware */
33#define ANCHOR_LOAD_FPGA 0xA5 /* This command is not implemented in the core. Requires firmware. Emagic extension */
34#define MAX_INTERNAL_ADDRESS 0x1B3F /* This is the highest internal RAM address for the AN2131Q */
35#define CPUCS_REG 0x7F92 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
36#define INTERNAL_RAM(address) (address <= MAX_INTERNAL_ADDRESS)
37
38static int emi62_writememory(struct usb_device *dev, int address,
39 const unsigned char *data, int length,
40 __u8 bRequest);
41static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
42static int emi62_load_firmware (struct usb_device *dev);
43static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id);
44static void emi62_disconnect(struct usb_interface *intf);
45
46/* thanks to drivers/usb/serial/keyspan_pda.c code */
47static int emi62_writememory(struct usb_device *dev, int address,
48 const unsigned char *data, int length,
49 __u8 request)
50{
51 int result;
52 unsigned char *buffer = kmemdup(data, length, GFP_KERNEL);
53
54 if (!buffer) {
55 dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
56 return -ENOMEM;
57 }
58 /* Note: usb_control_msg returns negative value on error or length of the
59 * data that was written! */
60 result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
61 kfree (buffer);
62 return result;
63}
64
65/* thanks to drivers/usb/serial/keyspan_pda.c code */
66static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
67{
68 int response;
69 dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
70
71 response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
72 if (response < 0)
73 dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
74 return response;
75}
76
77#define FW_LOAD_SIZE 1023
78
79static int emi62_load_firmware (struct usb_device *dev)
80{
81 const struct firmware *loader_fw = NULL;
82 const struct firmware *bitstream_fw = NULL;
83 const struct firmware *firmware_fw = NULL;
84 const struct ihex_binrec *rec;
85 int err = -ENOMEM;
86 int i;
87 __u32 addr; /* Address to write */
88 __u8 *buf;
89
90 dev_dbg(&dev->dev, "load_firmware\n");
91 buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
92 if (!buf)
93 goto wraperr;
94
95 err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev);
96 if (err)
97 goto nofw;
98
99 err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw",
100 &dev->dev);
101 if (err)
102 goto nofw;
103
104 err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
105 if (err) {
106 nofw:
107 goto wraperr;
108 }
109
110 /* Assert reset (stop the CPU in the EMI) */
111 err = emi62_set_reset(dev,1);
112 if (err < 0)
113 goto wraperr;
114
115 rec = (const struct ihex_binrec *)loader_fw->data;
116
117 /* 1. We need to put the loader for the FPGA into the EZ-USB */
118 while (rec) {
119 err = emi62_writememory(dev, be32_to_cpu(rec->addr),
120 rec->data, be16_to_cpu(rec->len),
121 ANCHOR_LOAD_INTERNAL);
122 if (err < 0)
123 goto wraperr;
124 rec = ihex_next_binrec(rec);
125 }
126
127 /* De-assert reset (let the CPU run) */
128 err = emi62_set_reset(dev,0);
129 if (err < 0)
130 goto wraperr;
131 msleep(250); /* let device settle */
132
133 /* 2. We upload the FPGA firmware into the EMI
134 * Note: collect up to 1023 (yes!) bytes and send them with
135 * a single request. This is _much_ faster! */
136 rec = (const struct ihex_binrec *)bitstream_fw->data;
137 do {
138 i = 0;
139 addr = be32_to_cpu(rec->addr);
140
141 /* intel hex records are terminated with type 0 element */
142 while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
143 memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
144 i += be16_to_cpu(rec->len);
145 rec = ihex_next_binrec(rec);
146 }
147 err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
148 if (err < 0)
149 goto wraperr;
150 } while (rec);
151
152 /* Assert reset (stop the CPU in the EMI) */
153 err = emi62_set_reset(dev,1);
154 if (err < 0)
155 goto wraperr;
156
157 /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
158 for (rec = (const struct ihex_binrec *)loader_fw->data;
159 rec; rec = ihex_next_binrec(rec)) {
160 err = emi62_writememory(dev, be32_to_cpu(rec->addr),
161 rec->data, be16_to_cpu(rec->len),
162 ANCHOR_LOAD_INTERNAL);
163 if (err < 0)
164 goto wraperr;
165 }
166
167 /* De-assert reset (let the CPU run) */
168 err = emi62_set_reset(dev,0);
169 if (err < 0)
170 goto wraperr;
171 msleep(250); /* let device settle */
172
173 /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
174
175 for (rec = (const struct ihex_binrec *)firmware_fw->data;
176 rec; rec = ihex_next_binrec(rec)) {
177 if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
178 err = emi62_writememory(dev, be32_to_cpu(rec->addr),
179 rec->data, be16_to_cpu(rec->len),
180 ANCHOR_LOAD_EXTERNAL);
181 if (err < 0)
182 goto wraperr;
183 }
184 }
185
186 /* Assert reset (stop the CPU in the EMI) */
187 err = emi62_set_reset(dev,1);
188 if (err < 0)
189 goto wraperr;
190
191 for (rec = (const struct ihex_binrec *)firmware_fw->data;
192 rec; rec = ihex_next_binrec(rec)) {
193 if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
194 err = emi62_writememory(dev, be32_to_cpu(rec->addr),
195 rec->data, be16_to_cpu(rec->len),
196 ANCHOR_LOAD_EXTERNAL);
197 if (err < 0)
198 goto wraperr;
199 }
200 }
201
202 /* De-assert reset (let the CPU run) */
203 err = emi62_set_reset(dev,0);
204 if (err < 0)
205 goto wraperr;
206 msleep(250); /* let device settle */
207
208 release_firmware(loader_fw);
209 release_firmware(bitstream_fw);
210 release_firmware(firmware_fw);
211
212 kfree(buf);
213
214 /* return 1 to fail the driver inialization
215 * and give real driver change to load */
216 return 1;
217
218wraperr:
219 if (err < 0)
220 dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
221 __func__, err);
222 release_firmware(loader_fw);
223 release_firmware(bitstream_fw);
224 release_firmware(firmware_fw);
225
226 kfree(buf);
227 dev_err(&dev->dev, "Error\n");
228 return err;
229}
230
231static const struct usb_device_id id_table[] = {
232 { USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
233 { } /* Terminating entry */
234};
235
236MODULE_DEVICE_TABLE (usb, id_table);
237
238static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id)
239{
240 struct usb_device *dev = interface_to_usbdev(intf);
241 dev_dbg(&intf->dev, "emi62_probe\n");
242
243 dev_info(&intf->dev, "%s start\n", __func__);
244
245 emi62_load_firmware(dev);
246
247 /* do not return the driver context, let real audio driver do that */
248 return -EIO;
249}
250
251static void emi62_disconnect(struct usb_interface *intf)
252{
253}
254
255static struct usb_driver emi62_driver = {
256 .name = "emi62 - firmware loader",
257 .probe = emi62_probe,
258 .disconnect = emi62_disconnect,
259 .id_table = id_table,
260};
261
262module_usb_driver(emi62_driver);
263
264MODULE_AUTHOR("Tapio Laxström");
265MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader.");
266MODULE_LICENSE("GPL");
267
268MODULE_FIRMWARE("emi62/loader.fw");
269MODULE_FIRMWARE("emi62/bitstream.fw");
270MODULE_FIRMWARE(FIRMWARE_FW);
271/* vi:ai:syntax=c:sw=8:ts=8:tw=80
272 */