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linux/drivers/usb/misc/emi26.c

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/*
* Emagic EMI 2|6 usb audio interface firmware loader.
* Copyright (C) 2002
* Tapio Laxström (tapio.laxstrom@iptime.fi)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, as published by
* the Free Software Foundation, version 2.
*
* emi26.c,v 1.13 2002/03/08 13:10:26 tapio Exp
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb.h>
#include <linux/delay.h>
#define MAX_INTEL_HEX_RECORD_LENGTH 16
typedef struct _INTEL_HEX_RECORD
{
__u32 length;
__u32 address;
__u32 type;
__u8 data[MAX_INTEL_HEX_RECORD_LENGTH];
} INTEL_HEX_RECORD, *PINTEL_HEX_RECORD;
/* include firmware (variables) */
#include "emi26_fw.h"
#define EMI26_VENDOR_ID 0x086a /* Emagic Soft-und Hardware GmBH */
#define EMI26_PRODUCT_ID 0x0100 /* EMI 2|6 without firmware */
#define EMI26B_PRODUCT_ID 0x0102 /* EMI 2|6 without firmware */
#define ANCHOR_LOAD_INTERNAL 0xA0 /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
#define ANCHOR_LOAD_EXTERNAL 0xA3 /* This command is not implemented in the core. Requires firmware */
#define ANCHOR_LOAD_FPGA 0xA5 /* This command is not implemented in the core. Requires firmware. Emagic extension */
#define MAX_INTERNAL_ADDRESS 0x1B3F /* This is the highest internal RAM address for the AN2131Q */
#define CPUCS_REG 0x7F92 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
#define INTERNAL_RAM(address) (address <= MAX_INTERNAL_ADDRESS)
static int emi26_writememory( struct usb_device *dev, int address, unsigned char *data, int length, __u8 bRequest);
static int emi26_set_reset(struct usb_device *dev, unsigned char reset_bit);
static int emi26_load_firmware (struct usb_device *dev);
static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id);
static void emi26_disconnect(struct usb_interface *intf);
static int __init emi26_init (void);
static void __exit emi26_exit (void);
/* thanks to drivers/usb/serial/keyspan_pda.c code */
static int emi26_writememory (struct usb_device *dev, int address, unsigned char *data, int length, __u8 request)
{
int result;
unsigned char *buffer = kmemdup(data, length, GFP_KERNEL);
if (!buffer) {
err("emi26: kmalloc(%d) failed.", length);
return -ENOMEM;
}
/* Note: usb_control_msg returns negative value on error or length of the
* data that was written! */
result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
kfree (buffer);
return result;
}
/* thanks to drivers/usb/serial/keyspan_pda.c code */
static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
{
int response;
info("%s - %d", __FUNCTION__, reset_bit);
/* printk(KERN_DEBUG "%s - %d", __FUNCTION__, reset_bit); */
response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
if (response < 0) {
err("emi26: set_reset (%d) failed", reset_bit);
}
return response;
}
#define FW_LOAD_SIZE 1023
static int emi26_load_firmware (struct usb_device *dev)
{
int err;
int i;
int pos = 0; /* Position in hex record */
__u32 addr; /* Address to write */
__u8 *buf;
buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
if (!buf) {
err( "%s - error loading firmware: error = %d", __FUNCTION__, -ENOMEM);
err = -ENOMEM;
goto wraperr;
}
/* Assert reset (stop the CPU in the EMI) */
err = emi26_set_reset(dev,1);
if (err < 0) {
err( "%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
/* 1. We need to put the loader for the FPGA into the EZ-USB */
for (i=0; g_Loader[i].type == 0; i++) {
err = emi26_writememory(dev, g_Loader[i].address, g_Loader[i].data, g_Loader[i].length, ANCHOR_LOAD_INTERNAL);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
}
/* De-assert reset (let the CPU run) */
err = emi26_set_reset(dev,0);
msleep(250); /* let device settle */
/* 2. We upload the FPGA firmware into the EMI
* Note: collect up to 1023 (yes!) bytes and send them with
* a single request. This is _much_ faster! */
do {
i = 0;
addr = g_bitstream[pos].address;
/* intel hex records are terminated with type 0 element */
while ((g_bitstream[pos].type == 0) && (i + g_bitstream[pos].length < FW_LOAD_SIZE)) {
memcpy(buf + i, g_bitstream[pos].data, g_bitstream[pos].length);
i += g_bitstream[pos].length;
pos++;
}
err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
} while (i > 0);
/* Assert reset (stop the CPU in the EMI) */
err = emi26_set_reset(dev,1);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
/* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
for (i=0; g_Loader[i].type == 0; i++) {
err = emi26_writememory(dev, g_Loader[i].address, g_Loader[i].data, g_Loader[i].length, ANCHOR_LOAD_INTERNAL);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
}
msleep(250); /* let device settle */
/* De-assert reset (let the CPU run) */
err = emi26_set_reset(dev,0);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
for (i=0; g_Firmware[i].type == 0; i++) {
if (!INTERNAL_RAM(g_Firmware[i].address)) {
err = emi26_writememory(dev, g_Firmware[i].address, g_Firmware[i].data, g_Firmware[i].length, ANCHOR_LOAD_EXTERNAL);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
}
}
/* Assert reset (stop the CPU in the EMI) */
err = emi26_set_reset(dev,1);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
for (i=0; g_Firmware[i].type == 0; i++) {
if (INTERNAL_RAM(g_Firmware[i].address)) {
err = emi26_writememory(dev, g_Firmware[i].address, g_Firmware[i].data, g_Firmware[i].length, ANCHOR_LOAD_INTERNAL);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
}
}
/* De-assert reset (let the CPU run) */
err = emi26_set_reset(dev,0);
if (err < 0) {
err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr;
}
msleep(250); /* let device settle */
/* return 1 to fail the driver inialization
* and give real driver change to load */
err = 1;
wraperr:
kfree(buf);
return err;
}
static struct usb_device_id id_table [] = {
{ USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
{ USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, id_table);
static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_device *dev = interface_to_usbdev(intf);
info("%s start", __FUNCTION__);
emi26_load_firmware(dev);
/* do not return the driver context, let real audio driver do that */
return -EIO;
}
static void emi26_disconnect(struct usb_interface *intf)
{
}
static struct usb_driver emi26_driver = {
.name = "emi26 - firmware loader",
.probe = emi26_probe,
.disconnect = emi26_disconnect,
.id_table = id_table,
};
static int __init emi26_init (void)
{
return usb_register(&emi26_driver);
}
static void __exit emi26_exit (void)
{
usb_deregister (&emi26_driver);
}
module_init(emi26_init);
module_exit(emi26_exit);
MODULE_AUTHOR("tapio laxström");
MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
MODULE_LICENSE("GPL");
/* vi:ai:syntax=c:sw=8:ts=8:tw=80
*/
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