linux/drivers/usb/misc/emi26.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 * emi26.c,v 1.13 2002/03/08 13:10:26 tapio Exp
   8 */
   9#include <linux/kernel.h>
  10#include <linux/errno.h>
  11#include <linux/slab.h>
  12#include <linux/module.h>
  13#include <linux/usb.h>
  14#include <linux/delay.h>
  15#include <linux/firmware.h>
  16#include <linux/ihex.h>
  17
  18#define EMI26_VENDOR_ID                 0x086a  /* Emagic Soft-und Hardware GmBH */
  19#define EMI26_PRODUCT_ID                0x0100  /* EMI 2|6 without firmware */
  20#define EMI26B_PRODUCT_ID               0x0102  /* EMI 2|6 without firmware */
  21
  22#define ANCHOR_LOAD_INTERNAL    0xA0    /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
  23#define ANCHOR_LOAD_EXTERNAL    0xA3    /* This command is not implemented in the core. Requires firmware */
  24#define ANCHOR_LOAD_FPGA        0xA5    /* This command is not implemented in the core. Requires firmware. Emagic extension */
  25#define MAX_INTERNAL_ADDRESS    0x1B3F  /* This is the highest internal RAM address for the AN2131Q */
  26#define CPUCS_REG               0x7F92  /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */ 
  27#define INTERNAL_RAM(address)   (address <= MAX_INTERNAL_ADDRESS)
  28
  29static int emi26_writememory( struct usb_device *dev, int address,
  30                              const unsigned char *data, int length,
  31                              __u8 bRequest);
  32static int emi26_set_reset(struct usb_device *dev, unsigned char reset_bit);
  33static int emi26_load_firmware (struct usb_device *dev);
  34static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id);
  35static void emi26_disconnect(struct usb_interface *intf);
  36
  37/* thanks to drivers/usb/serial/keyspan_pda.c code */
  38static int emi26_writememory (struct usb_device *dev, int address,
  39                              const unsigned char *data, int length,
  40                              __u8 request)
  41{
  42        int result;
  43        unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
  44
  45        if (!buffer) {
  46                dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
  47                return -ENOMEM;
  48        }
  49        /* Note: usb_control_msg returns negative value on error or length of the
  50         *               data that was written! */
  51        result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
  52        kfree (buffer);
  53        return result;
  54}
  55
  56/* thanks to drivers/usb/serial/keyspan_pda.c code */
  57static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
  58{
  59        int response;
  60        dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
  61        /* printk(KERN_DEBUG "%s - %d", __func__, reset_bit); */
  62        response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
  63        if (response < 0) {
  64                dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
  65        }
  66        return response;
  67}
  68
  69#define FW_LOAD_SIZE            1023
  70
  71static int emi26_load_firmware (struct usb_device *dev)
  72{
  73        const struct firmware *loader_fw = NULL;
  74        const struct firmware *bitstream_fw = NULL;
  75        const struct firmware *firmware_fw = NULL;
  76        const struct ihex_binrec *rec;
  77        int err = -ENOMEM;
  78        int i;
  79        __u32 addr;     /* Address to write */
  80        __u8 *buf;
  81
  82        buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
  83        if (!buf)
  84                goto wraperr;
  85
  86        err = request_ihex_firmware(&loader_fw, "emi26/loader.fw", &dev->dev);
  87        if (err)
  88                goto nofw;
  89
  90        err = request_ihex_firmware(&bitstream_fw, "emi26/bitstream.fw",
  91                                    &dev->dev);
  92        if (err)
  93                goto nofw;
  94
  95        err = request_ihex_firmware(&firmware_fw, "emi26/firmware.fw",
  96                                    &dev->dev);
  97        if (err) {
  98        nofw:
  99                dev_err(&dev->dev, "%s - request_firmware() failed\n",
 100                        __func__);
 101                goto wraperr;
 102        }
 103
 104        /* Assert reset (stop the CPU in the EMI) */
 105        err = emi26_set_reset(dev,1);
 106        if (err < 0)
 107                goto wraperr;
 108
 109        rec = (const struct ihex_binrec *)loader_fw->data;
 110        /* 1. We need to put the loader for the FPGA into the EZ-USB */
 111        while (rec) {
 112                err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 113                                        rec->data, be16_to_cpu(rec->len),
 114                                        ANCHOR_LOAD_INTERNAL);
 115                if (err < 0)
 116                        goto wraperr;
 117                rec = ihex_next_binrec(rec);
 118        }
 119
 120        /* De-assert reset (let the CPU run) */
 121        err = emi26_set_reset(dev,0);
 122        if (err < 0)
 123                goto wraperr;
 124        msleep(250);    /* let device settle */
 125
 126        /* 2. We upload the FPGA firmware into the EMI
 127         * Note: collect up to 1023 (yes!) bytes and send them with
 128         * a single request. This is _much_ faster! */
 129        rec = (const struct ihex_binrec *)bitstream_fw->data;
 130        do {
 131                i = 0;
 132                addr = be32_to_cpu(rec->addr);
 133
 134                /* intel hex records are terminated with type 0 element */
 135                while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
 136                        memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
 137                        i += be16_to_cpu(rec->len);
 138                        rec = ihex_next_binrec(rec);
 139                }
 140                err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
 141                if (err < 0)
 142                        goto wraperr;
 143        } while (rec);
 144
 145        /* Assert reset (stop the CPU in the EMI) */
 146        err = emi26_set_reset(dev,1);
 147        if (err < 0)
 148                goto wraperr;
 149
 150        /* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
 151        for (rec = (const struct ihex_binrec *)loader_fw->data;
 152             rec; rec = ihex_next_binrec(rec)) {
 153                err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 154                                        rec->data, be16_to_cpu(rec->len),
 155                                        ANCHOR_LOAD_INTERNAL);
 156                if (err < 0)
 157                        goto wraperr;
 158        }
 159        msleep(250);    /* let device settle */
 160
 161        /* De-assert reset (let the CPU run) */
 162        err = emi26_set_reset(dev,0);
 163        if (err < 0)
 164                goto wraperr;
 165
 166        /* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
 167
 168        for (rec = (const struct ihex_binrec *)firmware_fw->data;
 169             rec; rec = ihex_next_binrec(rec)) {
 170                if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 171                        err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 172                                                rec->data, be16_to_cpu(rec->len),
 173                                                ANCHOR_LOAD_EXTERNAL);
 174                        if (err < 0)
 175                                goto wraperr;
 176                }
 177        }
 178
 179        /* Assert reset (stop the CPU in the EMI) */
 180        err = emi26_set_reset(dev,1);
 181        if (err < 0)
 182                goto wraperr;
 183
 184        for (rec = (const struct ihex_binrec *)firmware_fw->data;
 185             rec; rec = ihex_next_binrec(rec)) {
 186                if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
 187                        err = emi26_writememory(dev, be32_to_cpu(rec->addr),
 188                                                rec->data, be16_to_cpu(rec->len),
 189                                                ANCHOR_LOAD_INTERNAL);
 190                        if (err < 0)
 191                                goto wraperr;
 192                }
 193        }
 194
 195        /* De-assert reset (let the CPU run) */
 196        err = emi26_set_reset(dev,0);
 197        if (err < 0)
 198                goto wraperr;
 199        msleep(250);    /* let device settle */
 200
 201        /* return 1 to fail the driver inialization
 202         * and give real driver change to load */
 203        err = 1;
 204
 205wraperr:
 206        if (err < 0)
 207                dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
 208                        __func__, err);
 209
 210        release_firmware(loader_fw);
 211        release_firmware(bitstream_fw);
 212        release_firmware(firmware_fw);
 213
 214        kfree(buf);
 215        return err;
 216}
 217
 218static const struct usb_device_id id_table[] = {
 219        { USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
 220        { USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
 221        { }                                             /* Terminating entry */
 222};
 223
 224MODULE_DEVICE_TABLE (usb, id_table);
 225
 226static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
 227{
 228        struct usb_device *dev = interface_to_usbdev(intf);
 229
 230        dev_info(&intf->dev, "%s start\n", __func__);
 231
 232        emi26_load_firmware(dev);
 233
 234        /* do not return the driver context, let real audio driver do that */
 235        return -EIO;
 236}
 237
 238static void emi26_disconnect(struct usb_interface *intf)
 239{
 240}
 241
 242static struct usb_driver emi26_driver = {
 243        .name           = "emi26 - firmware loader",
 244        .probe          = emi26_probe,
 245        .disconnect     = emi26_disconnect,
 246        .id_table       = id_table,
 247};
 248
 249module_usb_driver(emi26_driver);
 250
 251MODULE_AUTHOR("Tapio Laxstr\xC3\xB6m");
 252MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
 253MODULE_LICENSE("GPL");
 254
 255MODULE_FIRMWARE("emi26/loader.fw");
 256MODULE_FIRMWARE("emi26/bitstream.fw");
 257MODULE_FIRMWARE("emi26/firmware.fw");
 258/* vi:ai:syntax=c:sw=8:ts=8:tw=80
 259 */
 260