drivers/usb/misc/emi26.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  * emi26.c,v 1.13 2002/03/08 13:10:26 tapio Exp
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/usb.h>
  18 #include <linux/delay.h>
  19 #include <linux/firmware.h>
  20 #include <linux/ihex.h>
  21
  22 #define EMI26_VENDOR_ID                 0x086a  /* Emagic Soft-und Hardware GmBH */
  23 #define EMI26_PRODUCT_ID                0x0100  /* EMI 2|6 without firmware */
  24 #define EMI26B_PRODUCT_ID               0x0102  /* EMI 2|6 without firmware */
  25
  26 #define ANCHOR_LOAD_INTERNAL    0xA0    /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
  27 #define ANCHOR_LOAD_EXTERNAL    0xA3    /* This command is not implemented in the core. Requires firmware */
  28 #define ANCHOR_LOAD_FPGA        0xA5    /* This command is not implemented in the core. Requires firmware. Emagic extension */
  29 #define MAX_INTERNAL_ADDRESS    0x1B3F  /* This is the highest internal RAM address for the AN2131Q */
  30 #define CPUCS_REG               0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */
  31 #define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)
  32
  33 static int emi26_writememory( struct usb_device *dev, int address,
  34                               const unsigned char *data, int length,
  35                               __u8 bRequest);
  36 static int emi26_set_reset(struct usb_device *dev, unsigned char reset_bit);
  37 static int emi26_load_firmware (struct usb_device *dev);
  38 static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id);
  39 static void emi26_disconnect(struct usb_interface *intf);
  40 static int __init emi26_init (void);
  41 static void __exit emi26_exit (void);
  42
  43
  44 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  45 static int emi26_writememory (struct usb_device *dev, int address,
  46                               const unsigned char *data, int length,
  47                               __u8 request)
  48 {
  49         int result;
  50         unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
  51
  52         if (!buffer) {
  53                 dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
  54                 return -ENOMEM;
  55         }
  56         /* Note: usb_control_msg returns negative value on error or length of the
  57          *               data that was written! */
  58         result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  59         kfree (buffer);
  60         return result;
  61 }
  62
  63 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  64 static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
  65 {
  66         int response;
  67         dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
  68         /* printk(KERN_DEBUG "%s - %d", __func__, reset_bit); */
  69         response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  70         if (response < 0) {
  71                 dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
  72         }
  73         return response;
  74 }
  75
  76 #define FW_LOAD_SIZE            1023
  77
  78 static int emi26_load_firmware (struct usb_device *dev)
  79 {
  80         const struct firmware *loader_fw = NULL;
  81         const struct firmware *bitstream_fw = NULL;
  82         const struct firmware *firmware_fw = NULL;
  83         const struct ihex_binrec *rec;
  84         int err;
  85         int i;
  86         __u32 addr;     /* Address to write */
  87         __u8 *buf;
  88
  89         buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
  90         if (!buf) {
  91                 dev_err(&dev->dev, "%s - error loading firmware: error = %d\n",
  92                         __func__, -ENOMEM);
  93                 err = -ENOMEM;
  94                 goto wraperr;
  95         }
  96
  97         err = request_ihex_firmware(&loader_fw, "emi26/loader.fw", &dev->dev);
  98         if (err)
  99                 goto nofw;
 100
 101         err = request_ihex_firmware(&bitstream_fw, "emi26/bitstream.fw",
 102                                     &dev->dev);
 103         if (err)
 104                 goto nofw;
 105
 106         err = request_ihex_firmware(&firmware_fw, "emi26/firmware.fw",
 107                                     &dev->dev);
 108         if (err) {
 109         nofw:
 110                 dev_err(&dev->dev, "%s - request_firmware() failed\n",
 111                         __func__);
 112                 goto wraperr;
 113         }
 114
 115         /* Assert reset (stop the CPU in the EMI) */
 116         err = emi26_set_reset(dev,1);
 117         if (err < 0) {
 118                 dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
 119                         __func__, err);
 120                 goto wraperr;
 121         }
 122
 123         rec = (const struct ihex_binrec *)loader_fw->data;
 124         /* 1. We need to put the loader for the FPGA into the EZ-USB */
 125         while (rec) {
 126                 err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 127                                         rec->data, be16_to_cpu(rec->len),
 128                                         ANCHOR_LOAD_INTERNAL);
 129                 if (err < 0) {
 130                         err("%s - error loading firmware: error = %d", __func__, err);
 131                         goto wraperr;
 132                 }
 133                 rec = ihex_next_binrec(rec);
 134         }
 135
 136         /* De-assert reset (let the CPU run) */
 137         err = emi26_set_reset(dev,0);
 138         if (err < 0) {
 139                 err("%s - error loading firmware: error = %d", __func__, err);
 140                 goto wraperr;
 141         }
 142         msleep(250);    /* let device settle */
 143
 144         /* 2. We upload the FPGA firmware into the EMI
 145          * Note: collect up to 1023 (yes!) bytes and send them with
 146          * a single request. This is _much_ faster! */
 147         rec = (const struct ihex_binrec *)bitstream_fw->data;
 148         do {
 149                 i = 0;
 150                 addr = be32_to_cpu(rec->addr);
 151
 152                 /* intel hex records are terminated with type 0 element */
 153                 while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
 154                         memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
 155                         i += be16_to_cpu(rec->len);
 156                         rec = ihex_next_binrec(rec);
 157                 }
 158                 err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 159                 if (err < 0) {
 160                         err("%s - error loading firmware: error = %d", __func__, err);
 161                         goto wraperr;
 162                 }
 163         } while (rec);
 164
 165         /* Assert reset (stop the CPU in the EMI) */
 166         err = emi26_set_reset(dev,1);
 167         if (err < 0) {
 168                 err("%s - error loading firmware: error = %d", __func__, err);
 169                 goto wraperr;
 170         }
 171
 172         /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 173         for (rec = (const struct ihex_binrec *)loader_fw->data;
 174              rec; rec = ihex_next_binrec(rec)) {
 175                 err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 176                                         rec->data, be16_to_cpu(rec->len),
 177                                         ANCHOR_LOAD_INTERNAL);
 178                 if (err < 0) {
 179                         err("%s - error loading firmware: error = %d", __func__, err);
 180                         goto wraperr;
 181                 }
 182         }
 183         msleep(250);    /* let device settle */
 184
 185         /* De-assert reset (let the CPU run) */
 186         err = emi26_set_reset(dev,0);
 187         if (err < 0) {
 188                 err("%s - error loading firmware: error = %d", __func__, err);
 189                 goto wraperr;
 190         }
 191
 192         /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 193
 194         for (rec = (const struct ihex_binrec *)firmware_fw->data;
 195              rec; rec = ihex_next_binrec(rec)) {
 196                 if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 197                         err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 198                                                 rec->data, be16_to_cpu(rec->len),
 199                                                 ANCHOR_LOAD_EXTERNAL);
 200                         if (err < 0) {
 201                                 err("%s - error loading firmware: error = %d", __func__, err);
 202                                 goto wraperr;
 203                         }
 204                 }
 205         }
 206
 207         /* Assert reset (stop the CPU in the EMI) */
 208         err = emi26_set_reset(dev,1);
 209         if (err < 0) {
 210                 err("%s - error loading firmware: error = %d", __func__, err);
 211                 goto wraperr;
 212         }
 213
 214         for (rec = (const struct ihex_binrec *)firmware_fw->data;
 215              rec; rec = ihex_next_binrec(rec)) {
 216                 if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 217                         err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 218                                                 rec->data, be16_to_cpu(rec->len),
 219                                                 ANCHOR_LOAD_INTERNAL);
 220                         if (err < 0) {
 221                                 err("%s - error loading firmware: error = %d", __func__, err);
 222                                 goto wraperr;
 223                         }
 224                 }
 225         }
 226
 227         /* De-assert reset (let the CPU run) */
 228         err = emi26_set_reset(dev,0);
 229         if (err < 0) {
 230                 err("%s - error loading firmware: error = %d", __func__, err);
 231                 goto wraperr;
 232         }
 233         msleep(250);    /* let device settle */
 234
 235         /* return 1 to fail the driver inialization
 236          * and give real driver change to load */
 237         err = 1;
 238
 239 wraperr:
 240         release_firmware(loader_fw);
 241         release_firmware(bitstream_fw);
 242         release_firmware(firmware_fw);
 243
 244         kfree(buf);
 245         return err;
 246 }
 247
 248 static const struct usb_device_id id_table[] = {
 249         { USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
 250         { USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
 251         { }                                             /* Terminating entry */
 252 };
 253
 254 MODULE_DEVICE_TABLE (usb, id_table);
 255
 256 static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
 257 {
 258         struct usb_device *dev = interface_to_usbdev(intf);
 259
 260         dev_info(&intf->dev, "%s start\n", __func__);
 261
 262         emi26_load_firmware(dev);
 263
 264         /* do not return the driver context, let real audio driver do that */
 265         return -EIO;
 266 }
 267
 268 static void emi26_disconnect(struct usb_interface *intf)
 269 {
 270 }
 271
 272 static struct usb_driver emi26_driver = {
 273         .name           = "emi26 - firmware loader",
 274         .probe          = emi26_probe,
 275         .disconnect     = emi26_disconnect,
 276         .id_table       = id_table,
 277 };
 278
 279 static int __init emi26_init (void)
 280 {
 281         return usb_register(&emi26_driver);
 282 }
 283
 284 static void __exit emi26_exit (void)
 285 {
 286         usb_deregister (&emi26_driver);
 287 }
 288
 289 module_init(emi26_init);
 290 module_exit(emi26_exit);
 291
 292 MODULE_AUTHOR("Tapio Laxström");
 293 MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
 294 MODULE_LICENSE("GPL");
 295
 296 MODULE_FIRMWARE("emi26/loader.fw");
 297 MODULE_FIRMWARE("emi26/bitstream.fw");
 298 MODULE_FIRMWARE("emi26/firmware.fw");
 299 /* vi:ai:syntax=c:sw=8:ts=8:tw=80
 300  */