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
  41 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  42 static int emi26_writememory (struct usb_device *dev, int address,
  43                               const unsigned char *data, int length,
  44                               __u8 request)
  45 {
  46         int result;
  47         unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
  48
  49         if (!buffer) {
  50                 dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
  51                 return -ENOMEM;
  52         }
  53         /* Note: usb_control_msg returns negative value on error or length of the
  54          *               data that was written! */
  55         result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  56         kfree (buffer);
  57         return result;
  58 }
  59
  60 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  61 static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
  62 {
  63         int response;
  64         dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
  65         /* printk(KERN_DEBUG "%s - %d", __func__, reset_bit); */
  66         response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  67         if (response < 0) {
  68                 dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
  69         }
  70         return response;
  71 }
  72
  73 #define FW_LOAD_SIZE            1023
  74
  75 static int emi26_load_firmware (struct usb_device *dev)
  76 {
  77         const struct firmware *loader_fw = NULL;
  78         const struct firmware *bitstream_fw = NULL;
  79         const struct firmware *firmware_fw = NULL;
  80         const struct ihex_binrec *rec;
  81         int err = -ENOMEM;
  82         int i;
  83         __u32 addr;     /* Address to write */
  84         __u8 *buf;
  85
  86         buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
  87         if (!buf)
  88                 goto wraperr;
  89
  90         err = request_ihex_firmware(&loader_fw, "emi26/loader.fw", &dev->dev);
  91         if (err)
  92                 goto nofw;
  93
  94         err = request_ihex_firmware(&bitstream_fw, "emi26/bitstream.fw",
  95                                     &dev->dev);
  96         if (err)
  97                 goto nofw;
  98
  99         err = request_ihex_firmware(&firmware_fw, "emi26/firmware.fw",
 100                                     &dev->dev);
 101         if (err) {
 102         nofw:
 103                 dev_err(&dev->dev, "%s - request_firmware() failed\n",
 104                         __func__);
 105                 goto wraperr;
 106         }
 107
 108         /* Assert reset (stop the CPU in the EMI) */
 109         err = emi26_set_reset(dev,1);
 110         if (err < 0)
 111                 goto wraperr;
 112
 113         rec = (const struct ihex_binrec *)loader_fw->data;
 114         /* 1. We need to put the loader for the FPGA into the EZ-USB */
 115         while (rec) {
 116                 err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 117                                         rec->data, be16_to_cpu(rec->len),
 118                                         ANCHOR_LOAD_INTERNAL);
 119                 if (err < 0)
 120                         goto wraperr;
 121                 rec = ihex_next_binrec(rec);
 122         }
 123
 124         /* De-assert reset (let the CPU run) */
 125         err = emi26_set_reset(dev,0);
 126         if (err < 0)
 127                 goto wraperr;
 128         msleep(250);    /* let device settle */
 129
 130         /* 2. We upload the FPGA firmware into the EMI
 131          * Note: collect up to 1023 (yes!) bytes and send them with
 132          * a single request. This is _much_ faster! */
 133         rec = (const struct ihex_binrec *)bitstream_fw->data;
 134         do {
 135                 i = 0;
 136                 addr = be32_to_cpu(rec->addr);
 137
 138                 /* intel hex records are terminated with type 0 element */
 139                 while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
 140                         memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
 141                         i += be16_to_cpu(rec->len);
 142                         rec = ihex_next_binrec(rec);
 143                 }
 144                 err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 145                 if (err < 0)
 146                         goto wraperr;
 147         } while (rec);
 148
 149         /* Assert reset (stop the CPU in the EMI) */
 150         err = emi26_set_reset(dev,1);
 151         if (err < 0)
 152                 goto wraperr;
 153
 154         /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 155         for (rec = (const struct ihex_binrec *)loader_fw->data;
 156              rec; rec = ihex_next_binrec(rec)) {
 157                 err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 158                                         rec->data, be16_to_cpu(rec->len),
 159                                         ANCHOR_LOAD_INTERNAL);
 160                 if (err < 0)
 161                         goto wraperr;
 162         }
 163         msleep(250);    /* let device settle */
 164
 165         /* De-assert reset (let the CPU run) */
 166         err = emi26_set_reset(dev,0);
 167         if (err < 0)
 168                 goto wraperr;
 169
 170         /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 171
 172         for (rec = (const struct ihex_binrec *)firmware_fw->data;
 173              rec; rec = ihex_next_binrec(rec)) {
 174                 if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 175                         err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 176                                                 rec->data, be16_to_cpu(rec->len),
 177                                                 ANCHOR_LOAD_EXTERNAL);
 178                         if (err < 0)
 179                                 goto wraperr;
 180                 }
 181         }
 182
 183         /* Assert reset (stop the CPU in the EMI) */
 184         err = emi26_set_reset(dev,1);
 185         if (err < 0)
 186                 goto wraperr;
 187
 188         for (rec = (const struct ihex_binrec *)firmware_fw->data;
 189              rec; rec = ihex_next_binrec(rec)) {
 190                 if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 191                         err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 192                                                 rec->data, be16_to_cpu(rec->len),
 193                                                 ANCHOR_LOAD_INTERNAL);
 194                         if (err < 0)
 195                                 goto wraperr;
 196                 }
 197         }
 198
 199         /* De-assert reset (let the CPU run) */
 200         err = emi26_set_reset(dev,0);
 201         if (err < 0)
 202                 goto wraperr;
 203         msleep(250);    /* let device settle */
 204
 205         /* return 1 to fail the driver inialization
 206          * and give real driver change to load */
 207         err = 1;
 208
 209 wraperr:
 210         if (err < 0)
 211                 dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
 212                         __func__, err);
 213
 214         release_firmware(loader_fw);
 215         release_firmware(bitstream_fw);
 216         release_firmware(firmware_fw);
 217
 218         kfree(buf);
 219         return err;
 220 }
 221
 222 static const struct usb_device_id id_table[] = {
 223         { USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
 224         { USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
 225         { }                                             /* Terminating entry */
 226 };
 227
 228 MODULE_DEVICE_TABLE (usb, id_table);
 229
 230 static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
 231 {
 232         struct usb_device *dev = interface_to_usbdev(intf);
 233
 234         dev_info(&intf->dev, "%s start\n", __func__);
 235
 236         emi26_load_firmware(dev);
 237
 238         /* do not return the driver context, let real audio driver do that */
 239         return -EIO;
 240 }
 241
 242 static void emi26_disconnect(struct usb_interface *intf)
 243 {
 244 }
 245
 246 static struct usb_driver emi26_driver = {
 247         .name           = "emi26 - firmware loader",
 248         .probe          = emi26_probe,
 249         .disconnect     = emi26_disconnect,
 250         .id_table       = id_table,
 251 };
 252
 253 module_usb_driver(emi26_driver);
 254
 255 MODULE_AUTHOR("Tapio Laxström");
 256 MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
 257 MODULE_LICENSE("GPL");
 258
 259 MODULE_FIRMWARE("emi26/loader.fw");
 260 MODULE_FIRMWARE("emi26/bitstream.fw");
 261 MODULE_FIRMWARE("emi26/firmware.fw");
 262 /* vi:ai:syntax=c:sw=8:ts=8:tw=80
 263  */