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
  20 #define MAX_INTEL_HEX_RECORD_LENGTH 16
  21 typedef struct _INTEL_HEX_RECORD
  22 {
  23         __u32   length;
  24         __u32   address;
  25         __u32   type;
  26         __u8    data[MAX_INTEL_HEX_RECORD_LENGTH];
  27 } INTEL_HEX_RECORD, *PINTEL_HEX_RECORD;
  28
  29 /* include firmware (variables) */
  30 #include "emi26_fw.h"
  31
  32 #define EMI26_VENDOR_ID                 0x086a  /* Emagic Soft-und Hardware GmBH */
  33 #define EMI26_PRODUCT_ID                0x0100  /* EMI 2|6 without firmware */
  34 #define EMI26B_PRODUCT_ID               0x0102  /* EMI 2|6 without firmware */
  35
  36 #define ANCHOR_LOAD_INTERNAL    0xA0    /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
  37 #define ANCHOR_LOAD_EXTERNAL    0xA3    /* This command is not implemented in the core. Requires firmware */
  38 #define ANCHOR_LOAD_FPGA        0xA5    /* This command is not implemented in the core. Requires firmware. Emagic extension */
  39 #define MAX_INTERNAL_ADDRESS    0x1B3F  /* This is the highest internal RAM address for the AN2131Q */
  40 #define CPUCS_REG               0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */
  41 #define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)
  42
  43 static int emi26_writememory( struct usb_device *dev, int address, unsigned char *data, int length, __u8 bRequest);
  44 static int emi26_set_reset(struct usb_device *dev, unsigned char reset_bit);
  45 static int emi26_load_firmware (struct usb_device *dev);
  46 static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id);
  47 static void emi26_disconnect(struct usb_interface *intf);
  48 static int __init emi26_init (void);
  49 static void __exit emi26_exit (void);
  50
  51
  52 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  53 static int emi26_writememory (struct usb_device *dev, int address, unsigned char *data, int length, __u8 request)
  54 {
  55         int result;
  56         unsigned char *buffer =  kmalloc (length, GFP_KERNEL);
  57
  58         if (!buffer) {
  59                 err("emi26: kmalloc(%d) failed.", length);
  60                 return -ENOMEM;
  61         }
  62         memcpy (buffer, data, length);
  63         /* Note: usb_control_msg returns negative value on error or length of the
  64          *               data that was written! */
  65         result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  66         kfree (buffer);
  67         return result;
  68 }
  69
  70 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  71 static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
  72 {
  73         int response;
  74         info("%s - %d", __FUNCTION__, reset_bit);
  75         /* printk(KERN_DEBUG "%s - %d", __FUNCTION__, reset_bit); */
  76         response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  77         if (response < 0) {
  78                 err("emi26: set_reset (%d) failed", reset_bit);
  79         }
  80         return response;
  81 }
  82
  83 #define FW_LOAD_SIZE            1023
  84
  85 static int emi26_load_firmware (struct usb_device *dev)
  86 {
  87         int err;
  88         int i;
  89         int pos = 0;    /* Position in hex record */
  90         __u32 addr;     /* Address to write */
  91         __u8 *buf;
  92
  93         buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
  94         if (!buf) {
  95                 err( "%s - error loading firmware: error = %d", __FUNCTION__, -ENOMEM);
  96                 err = -ENOMEM;
  97                 goto wraperr;
  98         }
  99
 100         /* Assert reset (stop the CPU in the EMI) */
 101         err = emi26_set_reset(dev,1);
 102         if (err < 0) {
 103                 err( "%s - error loading firmware: error = %d", __FUNCTION__, err);
 104                 goto wraperr;
 105         }
 106
 107         /* 1. We need to put the loader for the FPGA into the EZ-USB */
 108         for (i=0; g_Loader[i].type == 0; i++) {
 109                 err = emi26_writememory(dev, g_Loader[i].address, g_Loader[i].data, g_Loader[i].length, ANCHOR_LOAD_INTERNAL);
 110                 if (err < 0) {
 111                         err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 112                         goto wraperr;
 113                 }
 114         }
 115
 116         /* De-assert reset (let the CPU run) */
 117         err = emi26_set_reset(dev,0);
 118         msleep(250);    /* let device settle */
 119
 120         /* 2. We upload the FPGA firmware into the EMI
 121          * Note: collect up to 1023 (yes!) bytes and send them with
 122          * a single request. This is _much_ faster! */
 123         do {
 124                 i = 0;
 125                 addr = g_bitstream[pos].address;
 126
 127                 /* intel hex records are terminated with type 0 element */
 128                 while ((g_bitstream[pos].type == 0) && (i + g_bitstream[pos].length < FW_LOAD_SIZE)) {
 129                         memcpy(buf + i, g_bitstream[pos].data, g_bitstream[pos].length);
 130                         i += g_bitstream[pos].length;
 131                         pos++;
 132                 }
 133                 err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 134                 if (err < 0) {
 135                         err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 136                         goto wraperr;
 137                 }
 138         } while (i > 0);
 139
 140         /* Assert reset (stop the CPU in the EMI) */
 141         err = emi26_set_reset(dev,1);
 142         if (err < 0) {
 143                 err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 144                 goto wraperr;
 145         }
 146
 147         /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 148         for (i=0; g_Loader[i].type == 0; i++) {
 149                 err = emi26_writememory(dev, g_Loader[i].address, g_Loader[i].data, g_Loader[i].length, ANCHOR_LOAD_INTERNAL);
 150                 if (err < 0) {
 151                         err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 152                         goto wraperr;
 153                 }
 154         }
 155         msleep(250);    /* let device settle */
 156
 157         /* De-assert reset (let the CPU run) */
 158         err = emi26_set_reset(dev,0);
 159         if (err < 0) {
 160                 err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 161                 goto wraperr;
 162         }
 163
 164         /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 165         for (i=0; g_Firmware[i].type == 0; i++) {
 166                 if (!INTERNAL_RAM(g_Firmware[i].address)) {
 167                         err = emi26_writememory(dev, g_Firmware[i].address, g_Firmware[i].data, g_Firmware[i].length, ANCHOR_LOAD_EXTERNAL);
 168                         if (err < 0) {
 169                                 err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 170                                 goto wraperr;
 171                         }
 172                 }
 173         }
 174
 175         /* Assert reset (stop the CPU in the EMI) */
 176         err = emi26_set_reset(dev,1);
 177         if (err < 0) {
 178                 err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 179                 goto wraperr;
 180         }
 181
 182         for (i=0; g_Firmware[i].type == 0; i++) {
 183                 if (INTERNAL_RAM(g_Firmware[i].address)) {
 184                         err = emi26_writememory(dev, g_Firmware[i].address, g_Firmware[i].data, g_Firmware[i].length, ANCHOR_LOAD_INTERNAL);
 185                         if (err < 0) {
 186                                 err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 187                                 goto wraperr;
 188                         }
 189                 }
 190         }
 191
 192         /* De-assert reset (let the CPU run) */
 193         err = emi26_set_reset(dev,0);
 194         if (err < 0) {
 195                 err("%s - error loading firmware: error = %d", __FUNCTION__, err);
 196                 goto wraperr;
 197         }
 198         msleep(250);    /* let device settle */
 199
 200         /* return 1 to fail the driver inialization
 201          * and give real driver change to load */
 202         err = 1;
 203
 204 wraperr:
 205         kfree(buf);
 206         return err;
 207 }
 208
 209 static struct usb_device_id id_table [] = {
 210         { USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
 211         { USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
 212         { }                                             /* Terminating entry */
 213 };
 214
 215 MODULE_DEVICE_TABLE (usb, id_table);
 216
 217 static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
 218 {
 219         struct usb_device *dev = interface_to_usbdev(intf);
 220
 221         info("%s start", __FUNCTION__);
 222
 223         emi26_load_firmware(dev);
 224
 225         /* do not return the driver context, let real audio driver do that */
 226         return -EIO;
 227 }
 228
 229 static void emi26_disconnect(struct usb_interface *intf)
 230 {
 231 }
 232
 233 static struct usb_driver emi26_driver = {
 234         .name           = "emi26 - firmware loader",
 235         .probe          = emi26_probe,
 236         .disconnect     = emi26_disconnect,
 237         .id_table       = id_table,
 238 };
 239
 240 static int __init emi26_init (void)
 241 {
 242         return usb_register(&emi26_driver);
 243 }
 244
 245 static void __exit emi26_exit (void)
 246 {
 247         usb_deregister (&emi26_driver);
 248 }
 249
 250 module_init(emi26_init);
 251 module_exit(emi26_exit);
 252
 253 MODULE_AUTHOR("tapio laxström");
 254 MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
 255 MODULE_LICENSE("GPL");
 256
 257 /* vi:ai:syntax=c:sw=8:ts=8:tw=80
 258  */