linux/drivers/usb/misc/emi62.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/* 
   3 * Emagic EMI 2|6 usb audio interface firmware loader.
   4 * Copyright (C) 2002
   5 *      Tapio Laxstr\xC3\xB6m (tapio.laxstrom@iptime.fi)
   6 */
   7#include <linux/kernel.h>
   8#include <linux/errno.h>
   9#include <linux/slab.h>
  10#include <linux/module.h>
  11#include <linux/usb.h>
  12#include <linux/delay.h>
  13#include <linux/firmware.h>
  14#include <linux/ihex.h>
  15
  16/* include firmware (variables)*/
  17
  18/* FIXME: This is quick and dirty solution! */
  19#define SPDIF   /* if you want SPDIF comment next line */
  20//#undef SPDIF  /* if you want MIDI uncomment this line */ 
  21
  22#ifdef SPDIF
  23#define FIRMWARE_FW "emi62/spdif.fw"
  24#else
  25#define FIRMWARE_FW "emi62/midi.fw"
  26#endif
  27
  28#define EMI62_VENDOR_ID                 0x086a  /* Emagic Soft-und Hardware GmBH */
  29#define EMI62_PRODUCT_ID                0x0110  /* EMI 6|2m without firmware */
  30
  31#define ANCHOR_LOAD_INTERNAL    0xA0    /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
  32#define ANCHOR_LOAD_EXTERNAL    0xA3    /* This command is not implemented in the core. Requires firmware */
  33#define ANCHOR_LOAD_FPGA        0xA5    /* This command is not implemented in the core. Requires firmware. Emagic extension */
  34#define MAX_INTERNAL_ADDRESS    0x1B3F  /* This is the highest internal RAM address for the AN2131Q */
  35#define CPUCS_REG               0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */ 
  36#define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)
  37
  38static int emi62_writememory(struct usb_device *dev, int address,
  39                             const unsigned char *data, int length,
  40                             __u8 bRequest);
  41static int emi62_set_reset(struct usb_device *dev, unsigned char reset_bit);
  42static int emi62_load_firmware (struct usb_device *dev);
  43static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id);
  44static void emi62_disconnect(struct usb_interface *intf);
  45
  46/* thanks to drivers/usb/serial/keyspan_pda.c code */
  47static int emi62_writememory(struct usb_device *dev, int address,
  48                             const unsigned char *data, int length,
  49                             __u8 request)
  50{
  51        int result;
  52        unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
  53
  54        if (!buffer) {
  55                dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
  56                return -ENOMEM;
  57        }
  58        /* Note: usb_control_msg returns negative value on error or length of the
  59         *               data that was written! */
  60        result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  61        kfree (buffer);
  62        return result;
  63}
  64
  65/* thanks to drivers/usb/serial/keyspan_pda.c code */
  66static int emi62_set_reset (struct usb_device *dev, unsigned char reset_bit)
  67{
  68        int response;
  69        dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
  70        
  71        response = emi62_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  72        if (response < 0)
  73                dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
  74        return response;
  75}
  76
  77#define FW_LOAD_SIZE            1023
  78
  79static int emi62_load_firmware (struct usb_device *dev)
  80{
  81        const struct firmware *loader_fw = NULL;
  82        const struct firmware *bitstream_fw = NULL;
  83        const struct firmware *firmware_fw = NULL;
  84        const struct ihex_binrec *rec;
  85        int err = -ENOMEM;
  86        int i;
  87        __u32 addr;     /* Address to write */
  88        __u8 *buf;
  89
  90        dev_dbg(&dev->dev, "load_firmware\n");
  91        buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
  92        if (!buf)
  93                goto wraperr;
  94
  95        err = request_ihex_firmware(&loader_fw, "emi62/loader.fw", &dev->dev);
  96        if (err)
  97                goto nofw;
  98
  99        err = request_ihex_firmware(&bitstream_fw, "emi62/bitstream.fw",
 100                                    &dev->dev);
 101        if (err)
 102                goto nofw;
 103
 104        err = request_ihex_firmware(&firmware_fw, FIRMWARE_FW, &dev->dev);
 105        if (err) {
 106        nofw:
 107                goto wraperr;
 108        }
 109
 110        /* Assert reset (stop the CPU in the EMI) */
 111        err = emi62_set_reset(dev,1);
 112        if (err < 0)
 113                goto wraperr;
 114
 115        rec = (const struct ihex_binrec *)loader_fw->data;
 116
 117        /* 1. We need to put the loader for the FPGA into the EZ-USB */
 118        while (rec) {
 119                err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 120                                        rec->data, be16_to_cpu(rec->len),
 121                                        ANCHOR_LOAD_INTERNAL);
 122                if (err < 0)
 123                        goto wraperr;
 124                rec = ihex_next_binrec(rec);
 125        }
 126
 127        /* De-assert reset (let the CPU run) */
 128        err = emi62_set_reset(dev,0);
 129        if (err < 0)
 130                goto wraperr;
 131        msleep(250);    /* let device settle */
 132
 133        /* 2. We upload the FPGA firmware into the EMI
 134         * Note: collect up to 1023 (yes!) bytes and send them with
 135         * a single request. This is _much_ faster! */
 136        rec = (const struct ihex_binrec *)bitstream_fw->data;
 137        do {
 138                i = 0;
 139                addr = be32_to_cpu(rec->addr);
 140
 141                /* intel hex records are terminated with type 0 element */
 142                while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
 143                        memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
 144                        i += be16_to_cpu(rec->len);
 145                        rec = ihex_next_binrec(rec);
 146                }
 147                err = emi62_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 148                if (err < 0)
 149                        goto wraperr;
 150        } while (rec);
 151
 152        /* Assert reset (stop the CPU in the EMI) */
 153        err = emi62_set_reset(dev,1);
 154        if (err < 0)
 155                goto wraperr;
 156
 157        /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 158        for (rec = (const struct ihex_binrec *)loader_fw->data;
 159             rec; rec = ihex_next_binrec(rec)) {
 160                err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 161                                        rec->data, be16_to_cpu(rec->len),
 162                                        ANCHOR_LOAD_INTERNAL);
 163                if (err < 0)
 164                        goto wraperr;
 165        }
 166
 167        /* De-assert reset (let the CPU run) */
 168        err = emi62_set_reset(dev,0);
 169        if (err < 0)
 170                goto wraperr;
 171        msleep(250);    /* let device settle */
 172
 173        /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 174
 175        for (rec = (const struct ihex_binrec *)firmware_fw->data;
 176             rec; rec = ihex_next_binrec(rec)) {
 177                if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 178                        err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 179                                                rec->data, be16_to_cpu(rec->len),
 180                                                ANCHOR_LOAD_EXTERNAL);
 181                        if (err < 0)
 182                                goto wraperr;
 183                }
 184        }
 185
 186        /* Assert reset (stop the CPU in the EMI) */
 187        err = emi62_set_reset(dev,1);
 188        if (err < 0)
 189                goto wraperr;
 190
 191        for (rec = (const struct ihex_binrec *)firmware_fw->data;
 192             rec; rec = ihex_next_binrec(rec)) {
 193                if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 194                        err = emi62_writememory(dev, be32_to_cpu(rec->addr),
 195                                                rec->data, be16_to_cpu(rec->len),
 196                                                ANCHOR_LOAD_EXTERNAL);
 197                        if (err < 0)
 198                                goto wraperr;
 199                }
 200        }
 201
 202        /* De-assert reset (let the CPU run) */
 203        err = emi62_set_reset(dev,0);
 204        if (err < 0)
 205                goto wraperr;
 206        msleep(250);    /* let device settle */
 207
 208        release_firmware(loader_fw);
 209        release_firmware(bitstream_fw);
 210        release_firmware(firmware_fw);
 211
 212        kfree(buf);
 213
 214        /* return 1 to fail the driver inialization
 215         * and give real driver change to load */
 216        return 1;
 217
 218wraperr:
 219        if (err < 0)
 220                dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
 221                        __func__, err);
 222        release_firmware(loader_fw);
 223        release_firmware(bitstream_fw);
 224        release_firmware(firmware_fw);
 225
 226        kfree(buf);
 227        dev_err(&dev->dev, "Error\n");
 228        return err;
 229}
 230
 231static const struct usb_device_id id_table[] = {
 232        { USB_DEVICE(EMI62_VENDOR_ID, EMI62_PRODUCT_ID) },
 233        { }                                             /* Terminating entry */
 234};
 235
 236MODULE_DEVICE_TABLE (usb, id_table);
 237
 238static int emi62_probe(struct usb_interface *intf, const struct usb_device_id *id)
 239{
 240        struct usb_device *dev = interface_to_usbdev(intf);
 241        dev_dbg(&intf->dev, "emi62_probe\n");
 242
 243        dev_info(&intf->dev, "%s start\n", __func__);
 244
 245        emi62_load_firmware(dev);
 246
 247        /* do not return the driver context, let real audio driver do that */
 248        return -EIO;
 249}
 250
 251static void emi62_disconnect(struct usb_interface *intf)
 252{
 253}
 254
 255static struct usb_driver emi62_driver = {
 256        .name           = "emi62 - firmware loader",
 257        .probe          = emi62_probe,
 258        .disconnect     = emi62_disconnect,
 259        .id_table       = id_table,
 260};
 261
 262module_usb_driver(emi62_driver);
 263
 264MODULE_AUTHOR("Tapio Laxstr\xC3\xB6m");
 265MODULE_DESCRIPTION("Emagic EMI 6|2m firmware loader.");
 266MODULE_LICENSE("GPL");
 267
 268MODULE_FIRMWARE("emi62/loader.fw");
 269MODULE_FIRMWARE("emi62/bitstream.fw");
 270MODULE_FIRMWARE(FIRMWARE_FW);
 271/* vi:ai:syntax=c:sw=8:ts=8:tw=80
 272 */
 273