drivers/usb/misc/emi62.c

   1 /*
   2  * Emagic EMI 2|6 usb audio interface firmware loader.
   3  * Copyright (C) 2002
   4  *      Tapio Laxström (tapio.laxstrom@iptime.fi)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, as published by
   8  * the Free Software Foundation, version 2.
   9  *
  10  * $Id: emi62.c,v 1.15 2002/04/23 06:13:59 tapio Exp $
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/usb.h>
  18 #include <linux/delay.h>
  19 #include <linux/firmware.h>
  20 #include <linux/ihex.h>
  21
  22 /* include firmware (variables)*/
  23
  24 /* FIXME: This is quick and dirty solution! */
  25 #define SPDIF   /* if you want SPDIF comment next line */
  26 //#undef SPDIF  /* if you want MIDI uncomment this line */
  27
  28 #ifdef SPDIF
  29 #define FIRMWARE_FW "emi62/spdif.fw"
  30 #else
  31 #define FIRMWARE_FW "emi62/midi.fw"
  32 #endif
  33
  34 #define EMI62_VENDOR_ID                 0x086a  /* Emagic Soft-und Hardware GmBH */
  35 #define EMI62_PRODUCT_ID                0x0110  /* EMI 6|2m without firmware */
  36
  37 #define ANCHOR_LOAD_INTERNAL    0xA0    /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
  38 #define ANCHOR_LOAD_EXTERNAL    0xA3    /* This command is not implemented in the core. Requires firmware */
  39 #define ANCHOR_LOAD_FPGA        0xA5    /* This command is not implemented in the core. Requires firmware. Emagic extension */
  40 #define MAX_INTERNAL_ADDRESS    0x1B3F  /* This is the highest internal RAM address for the AN2131Q */
  41 #define CPUCS_REG               0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */
  42 #define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)
  43
  44 static int emi62_writememory(struct usb_device *dev, int address,
  45                              const unsigned char *data, int length,
  46                              __u8 bRequest);
  47 static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
  48 static int emi62_load_firmware (struct usb_device *dev);
  49 static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id);
  50 static void emi62_disconnect(struct usb_interface *intf);
  51 static int __init emi62_init (void);
  52 static void __exit emi62_exit (void);
  53
  54
  55 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  56 static int emi62_writememory(struct usb_device *dev, int address,
  57                              const unsigned char *data, int length,
  58                              __u8 request)
  59 {
  60         int result;
  61         unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
  62
  63         if (!buffer) {
  64                 err("emi62: kmalloc(%d) failed.", length);
  65                 return -ENOMEM;
  66         }
  67         /* Note: usb_control_msg returns negative value on error or length of the
  68          *               data that was written! */
  69         result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  70         kfree (buffer);
  71         return result;
  72 }
  73
  74 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  75 static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
  76 {
  77         int response;
  78         info("%s - %d", __func__, reset_bit);
  79
  80         response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  81         if (response < 0) {
  82                 err("emi62: set_reset (%d) failed", reset_bit);
  83         }
  84         return response;
  85 }
  86
  87 #define FW_LOAD_SIZE            1023
  88
  89 static int emi62_load_firmware (struct usb_device *dev)
  90 {
  91         const struct firmware *loader_fw = NULL;
  92         const struct firmware *bitstream_fw = NULL;
  93         const struct firmware *firmware_fw = NULL;
  94         const struct ihex_binrec *rec;
  95         int err;
  96         int i;
  97         __u32 addr;     /* Address to write */
  98         __u8 *buf;
  99
 100         dev_dbg(&dev->dev, "load_firmware\n");
 101         buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
 102         if (!buf) {
 103                 err( "%s - error loading firmware: error = %d", __func__, -ENOMEM);
 104                 err = -ENOMEM;
 105                 goto wraperr;
 106         }
 107
 108         err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev);
 109         if (err)
 110                 goto nofw;
 111
 112         err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw",
 113                                     &dev->dev);
 114         if (err)
 115                 goto nofw;
 116
 117         err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
 118         if (err) {
 119         nofw:
 120                 err( "%s - request_firmware() failed", __func__);
 121                 goto wraperr;
 122         }
 123
 124         /* Assert reset (stop the CPU in the EMI) */
 125         err = emi62_set_reset(dev,1);
 126         if (err < 0) {
 127                 err("%s - error loading firmware: error = %d", __func__, err);
 128                 goto wraperr;
 129         }
 130
 131         rec = (const struct ihex_binrec *)loader_fw->data;
 132
 133         /* 1. We need to put the loader for the FPGA into the EZ-USB */
 134         while (rec) {
 135                 err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 136                                         rec->data, be16_to_cpu(rec->len),
 137                                         ANCHOR_LOAD_INTERNAL);
 138                 if (err < 0) {
 139                         err("%s - error loading firmware: error = %d", __func__, err);
 140                         goto wraperr;
 141                 }
 142                 rec = ihex_next_binrec(rec);
 143         }
 144
 145         /* De-assert reset (let the CPU run) */
 146         err = emi62_set_reset(dev,0);
 147         if (err < 0) {
 148                 err("%s - error loading firmware: error = %d", __func__, err);
 149                 goto wraperr;
 150         }
 151         msleep(250);    /* let device settle */
 152
 153         /* 2. We upload the FPGA firmware into the EMI
 154          * Note: collect up to 1023 (yes!) bytes and send them with
 155          * a single request. This is _much_ faster! */
 156         rec = (const struct ihex_binrec *)bitstream_fw->data;
 157         do {
 158                 i = 0;
 159                 addr = be32_to_cpu(rec->addr);
 160
 161                 /* intel hex records are terminated with type 0 element */
 162                 while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
 163                         memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
 164                         i += be16_to_cpu(rec->len);
 165                         rec = ihex_next_binrec(rec);
 166                 }
 167                 err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 168                 if (err < 0) {
 169                         err("%s - error loading firmware: error = %d", __func__, err);
 170                         goto wraperr;
 171                 }
 172         } while (i > 0);
 173
 174         /* Assert reset (stop the CPU in the EMI) */
 175         err = emi62_set_reset(dev,1);
 176         if (err < 0) {
 177                 err("%s - error loading firmware: error = %d", __func__, err);
 178                 goto wraperr;
 179         }
 180
 181         /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 182         for (rec = (const struct ihex_binrec *)loader_fw->data;
 183              rec; rec = ihex_next_binrec(rec)) {
 184                 err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 185                                         rec->data, be16_to_cpu(rec->len),
 186                                         ANCHOR_LOAD_INTERNAL);
 187                 if (err < 0) {
 188                         err("%s - error loading firmware: error = %d", __func__, err);
 189                         goto wraperr;
 190                 }
 191         }
 192
 193         /* De-assert reset (let the CPU run) */
 194         err = emi62_set_reset(dev,0);
 195         if (err < 0) {
 196                 err("%s - error loading firmware: error = %d", __func__, err);
 197                 goto wraperr;
 198         }
 199         msleep(250);    /* let device settle */
 200
 201         /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 202
 203         for (rec = (const struct ihex_binrec *)firmware_fw->data;
 204              rec; rec = ihex_next_binrec(rec)) {
 205                 if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 206                         err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 207                                                 rec->data, be16_to_cpu(rec->len),
 208                                                 ANCHOR_LOAD_EXTERNAL);
 209                         if (err < 0) {
 210                                 err("%s - error loading firmware: error = %d", __func__, err);
 211                                 goto wraperr;
 212                         }
 213                 }
 214         }
 215
 216         /* Assert reset (stop the CPU in the EMI) */
 217         err = emi62_set_reset(dev,1);
 218         if (err < 0) {
 219                 err("%s - error loading firmware: error = %d", __func__, err);
 220                 goto wraperr;
 221         }
 222
 223         for (rec = (const struct ihex_binrec *)firmware_fw->data;
 224              rec; rec = ihex_next_binrec(rec)) {
 225                 if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 226                         err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 227                                                 rec->data, be16_to_cpu(rec->len),
 228                                                 ANCHOR_LOAD_EXTERNAL);
 229                         if (err < 0) {
 230                                 err("%s - error loading firmware: error = %d", __func__, err);
 231                                 goto wraperr;
 232                         }
 233                 }
 234         }
 235
 236         /* De-assert reset (let the CPU run) */
 237         err = emi62_set_reset(dev,0);
 238         if (err < 0) {
 239                 err("%s - error loading firmware: error = %d", __func__, err);
 240                 goto wraperr;
 241         }
 242         msleep(250);    /* let device settle */
 243
 244         release_firmware(loader_fw);
 245         release_firmware(bitstream_fw);
 246         release_firmware(firmware_fw);
 247
 248         kfree(buf);
 249
 250         /* return 1 to fail the driver inialization
 251          * and give real driver change to load */
 252         return 1;
 253
 254 wraperr:
 255         release_firmware(loader_fw);
 256         release_firmware(bitstream_fw);
 257         release_firmware(firmware_fw);
 258
 259         kfree(buf);
 260         dev_err(&dev->dev, "Error\n");
 261         return err;
 262 }
 263
 264 static __devinitdata struct usb_device_id id_table [] = {
 265         { USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
 266         { }                                             /* Terminating entry */
 267 };
 268
 269 MODULE_DEVICE_TABLE (usb, id_table);
 270
 271 static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id)
 272 {
 273         struct usb_device *dev = interface_to_usbdev(intf);
 274         dev_dbg(&intf->dev, "emi62_probe\n");
 275
 276         info("%s start", __func__);
 277
 278         emi62_load_firmware(dev);
 279
 280         /* do not return the driver context, let real audio driver do that */
 281         return -EIO;
 282 }
 283
 284 static void emi62_disconnect(struct usb_interface *intf)
 285 {
 286 }
 287
 288 static struct usb_driver emi62_driver = {
 289         .name           = "emi62 - firmware loader",
 290         .probe          = emi62_probe,
 291         .disconnect     = emi62_disconnect,
 292         .id_table       = id_table,
 293 };
 294
 295 static int __init emi62_init (void)
 296 {
 297         int retval;
 298         retval = usb_register (&emi62_driver);
 299         if (retval)
 300                 printk(KERN_ERR "adi-emi: registration failed\n");
 301         return retval;
 302 }
 303
 304 static void __exit emi62_exit (void)
 305 {
 306         usb_deregister (&emi62_driver);
 307 }
 308
 309 module_init(emi62_init);
 310 module_exit(emi62_exit);
 311
 312 MODULE_AUTHOR("Tapio Laxström");
 313 MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader.");
 314 MODULE_LICENSE("GPL");
 315
 316 MODULE_FIRMWARE("emi62/loader.fw");
 317 MODULE_FIRMWARE("emi62/bitstream.fw");
 318 MODULE_FIRMWARE(FIRMWARE_FW);
 319 /* vi:ai:syntax=c:sw=8:ts=8:tw=80
 320  */