emi26.c
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上传日期:2013-04-10
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- /*
- * Emagic EMI 2|6 usb audio interface firmware loader.
- * Copyright (C) 2002
- * Tapio Laxstr鰉 (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>
- #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 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 void *emi26_probe(struct usb_device *dev, unsigned int if_num, const struct usb_device_id *id);
- static void emi26_disconnect(struct usb_device *dev, void *drv_context);
- 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 = kmalloc (length, GFP_KERNEL);
- if (!buffer) {
- printk(KERN_ERR "emi26: kmalloc(%d) failed.", length);
- return -ENOMEM;
- }
- memcpy (buffer, data, length);
- /* 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;
- printk(KERN_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) {
- printk(KERN_ERR "emi26: set_reset (%d) failed", reset_bit);
- }
- return response;
- }
- 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[1023];
- /* Assert reset (stop the CPU in the EMI) */
- err = emi26_set_reset(dev,1);
- if (err < 0) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- /* 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) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- }
- /* De-assert reset (let the CPU run) */
- err = emi26_set_reset(dev,0);
- /* 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 < sizeof(buf))) {
- 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) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- } while (i > 0);
- /* Assert reset (stop the CPU in the EMI) */
- err = emi26_set_reset(dev,1);
- if (err < 0) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- /* 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) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- }
- /* De-assert reset (let the CPU run) */
- err = emi26_set_reset(dev,0);
- if (err < 0) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- /* 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) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- }
- }
-
- /* Assert reset (stop the CPU in the EMI) */
- err = emi26_set_reset(dev,1);
- if (err < 0) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- 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) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- }
- }
- /* De-assert reset (let the CPU run) */
- err = emi26_set_reset(dev,0);
- if (err < 0) {
- printk(KERN_ERR "%s - error loading firmware: error = %d", __FUNCTION__, err);
- return err;
- }
- /* return 1 to fail the driver inialization
- * and give real driver change to load */
- return 1;
- }
- static __devinitdata struct usb_device_id id_table [] = {
- { USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
- { } /* Terminating entry */
- };
- MODULE_DEVICE_TABLE (usb, id_table);
- static void * emi26_probe(struct usb_device *dev, unsigned int if_num, const struct usb_device_id *id)
- {
- printk(KERN_INFO "%s start", __FUNCTION__);
-
- if((dev->descriptor.idVendor == EMI26_VENDOR_ID) && (dev->descriptor.idProduct == EMI26_PRODUCT_ID)) {
- emi26_load_firmware(dev);
- }
-
- /* do not return the driver context, let real audio driver do that */
- return 0;
- }
- static void emi26_disconnect(struct usb_device *dev, void *drv_context)
- {
- }
- struct usb_driver emi26_driver = {
- name: "emi26 - firmware loader",
- probe: emi26_probe,
- disconnect: emi26_disconnect,
- id_table: NULL,
- };
- static int __init emi26_init (void)
- {
- usb_register (&emi26_driver);
- return 0;
- }
- static void __exit emi26_exit (void)
- {
- usb_deregister (&emi26_driver);
- }
- module_init(emi26_init);
- module_exit(emi26_exit);
- MODULE_AUTHOR("tapio laxstr鰉");
- MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
- MODULE_LICENSE("GPL");
- /* vi:ai:syntax=c:sw=8:ts=8:tw=80
- */