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 =  kmemdup(data, length, GFP_KERNEL);
  57
  58         if (!buffer) {
  59                 err("emi26: kmalloc(%d) failed.", length);
  60                 return -ENOMEM;
  61         }
  62         /* Note: usb_control_msg returns negative value on error or length of the
  63          *               data that was written! */
  64         result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  65         kfree (buffer);
  66         return result;
  67 }
  68
  69 /* thanks to drivers/usb/serial/keyspan_pda.c code */
  70 static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
  71 {
  72         int response;
  73         info("%s - %d", __func__, reset_bit);
  74         /* printk(KERN_DEBUG "%s - %d", __func__, reset_bit); */
  75         response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  76         if (response < 0) {
  77                 err("emi26: set_reset (%d) failed", reset_bit);
  78         }
  79         return response;
  80 }
  81
  82 #define FW_LOAD_SIZE            1023
  83
  84 static int emi26_load_firmware (struct usb_device *dev)
  85 {
  86         int err;
  87         int i;
  88         int pos = 0;    /* Position in hex record */
  89         __u32 addr;     /* Address to write */
  90         __u8 *buf;
  91
  92         buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
  93         if (!buf) {
  94                 err( "%s - error loading firmware: error = %d", __func__, -ENOMEM);
  95                 err = -ENOMEM;
  96                 goto wraperr;
  97         }
  98
  99         /* Assert reset (stop the CPU in the EMI) */
 100         err = emi26_set_reset(dev,1);
 101         if (err < 0) {
 102                 err( "%s - error loading firmware: error = %d", __func__, err);
 103                 goto wraperr;
 104         }
 105
 106         /* 1. We need to put the loader for the FPGA into the EZ-USB */
 107         for (i=0; g_Loader[i].type == 0; i++) {
 108                 err = emi26_writememory(dev, g_Loader[i].address, g_Loader[i].data, g_Loader[i].length, ANCHOR_LOAD_INTERNAL);
 109                 if (err < 0) {
 110                         err("%s - error loading firmware: error = %d", __func__, err);
 111                         goto wraperr;
 112                 }
 113         }
 114
 115         /* De-assert reset (let the CPU run) */
 116         err = emi26_set_reset(dev,0);
 117         if (err < 0) {
 118                 err("%s - error loading firmware: error = %d", __func__, err);
 119                 goto wraperr;
 120         }
 121         msleep(250);    /* let device settle */
 122
 123         /* 2. We upload the FPGA firmware into the EMI
 124          * Note: collect up to 1023 (yes!) bytes and send them with
 125          * a single request. This is _much_ faster! */
 126         do {
 127                 i = 0;
 128                 addr = g_bitstream[pos].address;
 129
 130                 /* intel hex records are terminated with type 0 element */
 131                 while ((g_bitstream[pos].type == 0) && (i + g_bitstream[pos].length < FW_LOAD_SIZE)) {
 132                         memcpy(buf + i, g_bitstream[pos].data, g_bitstream[pos].length);
 133                         i += g_bitstream[pos].length;
 134                         pos++;
 135                 }
 136                 err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 137                 if (err < 0) {
 138                         err("%s - error loading firmware: error = %d", __func__, err);
 139                         goto wraperr;
 140                 }
 141         } while (i > 0);
 142
 143         /* Assert reset (stop the CPU in the EMI) */
 144         err = emi26_set_reset(dev,1);
 145         if (err < 0) {
 146                 err("%s - error loading firmware: error = %d", __func__, err);
 147                 goto wraperr;
 148         }
 149
 150         /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 151         for (i=0; g_Loader[i].type == 0; i++) {
 152                 err = emi26_writememory(dev, g_Loader[i].address, g_Loader[i].data, g_Loader[i].length, ANCHOR_LOAD_INTERNAL);
 153                 if (err < 0) {
 154                         err("%s - error loading firmware: error = %d", __func__, err);
 155                         goto wraperr;
 156                 }
 157         }
 158         msleep(250);    /* let device settle */
 159
 160         /* De-assert reset (let the CPU run) */
 161         err = emi26_set_reset(dev,0);
 162         if (err < 0) {
 163                 err("%s - error loading firmware: error = %d", __func__, err);
 164                 goto wraperr;
 165         }
 166
 167         /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 168         for (i=0; g_Firmware[i].type == 0; i++) {
 169                 if (!INTERNAL_RAM(g_Firmware[i].address)) {
 170                         err = emi26_writememory(dev, g_Firmware[i].address, g_Firmware[i].data, g_Firmware[i].length, ANCHOR_LOAD_EXTERNAL);
 171                         if (err < 0) {
 172                                 err("%s - error loading firmware: error = %d", __func__, err);
 173                                 goto wraperr;
 174                         }
 175                 }
 176         }
 177
 178         /* Assert reset (stop the CPU in the EMI) */
 179         err = emi26_set_reset(dev,1);
 180         if (err < 0) {
 181                 err("%s - error loading firmware: error = %d", __func__, err);
 182                 goto wraperr;
 183         }
 184
 185         for (i=0; g_Firmware[i].type == 0; i++) {
 186                 if (INTERNAL_RAM(g_Firmware[i].address)) {
 187                         err = emi26_writememory(dev, g_Firmware[i].address, g_Firmware[i].data, g_Firmware[i].length, ANCHOR_LOAD_INTERNAL);
 188                         if (err < 0) {
 189                                 err("%s - error loading firmware: error = %d", __func__, err);
 190                                 goto wraperr;
 191                         }
 192                 }
 193         }
 194
 195         /* De-assert reset (let the CPU run) */
 196         err = emi26_set_reset(dev,0);
 197         if (err < 0) {
 198                 err("%s - error loading firmware: error = %d", __func__, err);
 199                 goto wraperr;
 200         }
 201         msleep(250);    /* let device settle */
 202
 203         /* return 1 to fail the driver inialization
 204          * and give real driver change to load */
 205         err = 1;
 206
 207 wraperr:
 208         kfree(buf);
 209         return err;
 210 }
 211
 212 static struct usb_device_id id_table [] = {
 213         { USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
 214         { USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
 215         { }                                             /* Terminating entry */
 216 };
 217
 218 MODULE_DEVICE_TABLE (usb, id_table);
 219
 220 static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
 221 {
 222         struct usb_device *dev = interface_to_usbdev(intf);
 223
 224         info("%s start", __func__);
 225
 226         emi26_load_firmware(dev);
 227
 228         /* do not return the driver context, let real audio driver do that */
 229         return -EIO;
 230 }
 231
 232 static void emi26_disconnect(struct usb_interface *intf)
 233 {
 234 }
 235
 236 static struct usb_driver emi26_driver = {
 237         .name           = "emi26 - firmware loader",
 238         .probe          = emi26_probe,
 239         .disconnect     = emi26_disconnect,
 240         .id_table       = id_table,
 241 };
 242
 243 static int __init emi26_init (void)
 244 {
 245         return usb_register(&emi26_driver);
 246 }
 247
 248 static void __exit emi26_exit (void)
 249 {
 250         usb_deregister (&emi26_driver);
 251 }
 252
 253 module_init(emi26_init);
 254 module_exit(emi26_exit);
 255
 256 MODULE_AUTHOR("Tapio Laxström");
 257 MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
 258 MODULE_LICENSE("GPL");
 259
 260 /* vi:ai:syntax=c:sw=8:ts=8:tw=80
 261  */