260 lines
7.5 KiB
C
260 lines
7.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Emagic EMI 2|6 usb audio interface firmware loader.
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* Copyright (C) 2002
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* Tapio Laxström (tapio.laxstrom@iptime.fi)
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*
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* emi26.c,v 1.13 2002/03/08 13:10:26 tapio Exp
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/ihex.h>
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#define EMI26_VENDOR_ID 0x086a /* Emagic Soft-und Hardware GmBH */
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#define EMI26_PRODUCT_ID 0x0100 /* EMI 2|6 without firmware */
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#define EMI26B_PRODUCT_ID 0x0102 /* EMI 2|6 without firmware */
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#define ANCHOR_LOAD_INTERNAL 0xA0 /* Vendor specific request code for Anchor Upload/Download (This one is implemented in the core) */
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#define ANCHOR_LOAD_EXTERNAL 0xA3 /* This command is not implemented in the core. Requires firmware */
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#define ANCHOR_LOAD_FPGA 0xA5 /* This command is not implemented in the core. Requires firmware. Emagic extension */
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#define MAX_INTERNAL_ADDRESS 0x1B3F /* This is the highest internal RAM address for the AN2131Q */
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#define CPUCS_REG 0x7F92 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
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#define INTERNAL_RAM(address) (address <= MAX_INTERNAL_ADDRESS)
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static int emi26_writememory( struct usb_device *dev, int address,
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const unsigned char *data, int length,
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__u8 bRequest);
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static int emi26_set_reset(struct usb_device *dev, unsigned char reset_bit);
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static int emi26_load_firmware (struct usb_device *dev);
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static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id);
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static void emi26_disconnect(struct usb_interface *intf);
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/* thanks to drivers/usb/serial/keyspan_pda.c code */
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static int emi26_writememory (struct usb_device *dev, int address,
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const unsigned char *data, int length,
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__u8 request)
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{
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int result;
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unsigned char *buffer = kmemdup(data, length, GFP_KERNEL);
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if (!buffer) {
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dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
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return -ENOMEM;
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}
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/* Note: usb_control_msg returns negative value on error or length of the
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* data that was written! */
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result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
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kfree (buffer);
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return result;
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}
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/* thanks to drivers/usb/serial/keyspan_pda.c code */
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static int emi26_set_reset (struct usb_device *dev, unsigned char reset_bit)
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{
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int response;
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dev_info(&dev->dev, "%s - %d\n", __func__, reset_bit);
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/* printk(KERN_DEBUG "%s - %d", __func__, reset_bit); */
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response = emi26_writememory (dev, CPUCS_REG, &reset_bit, 1, 0xa0);
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if (response < 0) {
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dev_err(&dev->dev, "set_reset (%d) failed\n", reset_bit);
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}
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return response;
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}
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#define FW_LOAD_SIZE 1023
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static int emi26_load_firmware (struct usb_device *dev)
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{
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const struct firmware *loader_fw = NULL;
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const struct firmware *bitstream_fw = NULL;
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const struct firmware *firmware_fw = NULL;
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const struct ihex_binrec *rec;
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int err = -ENOMEM;
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int i;
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__u32 addr; /* Address to write */
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__u8 *buf;
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buf = kmalloc(FW_LOAD_SIZE, GFP_KERNEL);
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if (!buf)
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goto wraperr;
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err = request_ihex_firmware(&loader_fw, "emi26/loader.fw", &dev->dev);
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if (err)
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goto nofw;
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err = request_ihex_firmware(&bitstream_fw, "emi26/bitstream.fw",
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&dev->dev);
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if (err)
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goto nofw;
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err = request_ihex_firmware(&firmware_fw, "emi26/firmware.fw",
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&dev->dev);
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if (err) {
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nofw:
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dev_err(&dev->dev, "%s - request_firmware() failed\n",
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__func__);
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goto wraperr;
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}
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/* Assert reset (stop the CPU in the EMI) */
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err = emi26_set_reset(dev,1);
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if (err < 0)
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goto wraperr;
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rec = (const struct ihex_binrec *)loader_fw->data;
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/* 1. We need to put the loader for the FPGA into the EZ-USB */
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while (rec) {
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err = emi26_writememory(dev, be32_to_cpu(rec->addr),
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rec->data, be16_to_cpu(rec->len),
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ANCHOR_LOAD_INTERNAL);
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if (err < 0)
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goto wraperr;
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rec = ihex_next_binrec(rec);
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}
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/* De-assert reset (let the CPU run) */
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err = emi26_set_reset(dev,0);
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if (err < 0)
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goto wraperr;
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msleep(250); /* let device settle */
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/* 2. We upload the FPGA firmware into the EMI
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* Note: collect up to 1023 (yes!) bytes and send them with
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* a single request. This is _much_ faster! */
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rec = (const struct ihex_binrec *)bitstream_fw->data;
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do {
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i = 0;
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addr = be32_to_cpu(rec->addr);
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/* intel hex records are terminated with type 0 element */
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while (rec && (i + be16_to_cpu(rec->len) < FW_LOAD_SIZE)) {
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memcpy(buf + i, rec->data, be16_to_cpu(rec->len));
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i += be16_to_cpu(rec->len);
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rec = ihex_next_binrec(rec);
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}
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err = emi26_writememory(dev, addr, buf, i, ANCHOR_LOAD_FPGA);
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if (err < 0)
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goto wraperr;
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} while (rec);
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/* Assert reset (stop the CPU in the EMI) */
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err = emi26_set_reset(dev,1);
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if (err < 0)
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goto wraperr;
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/* 3. We need to put the loader for the firmware into the EZ-USB (again...) */
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for (rec = (const struct ihex_binrec *)loader_fw->data;
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rec; rec = ihex_next_binrec(rec)) {
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err = emi26_writememory(dev, be32_to_cpu(rec->addr),
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rec->data, be16_to_cpu(rec->len),
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ANCHOR_LOAD_INTERNAL);
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if (err < 0)
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goto wraperr;
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}
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msleep(250); /* let device settle */
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/* De-assert reset (let the CPU run) */
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err = emi26_set_reset(dev,0);
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if (err < 0)
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goto wraperr;
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/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */
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for (rec = (const struct ihex_binrec *)firmware_fw->data;
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rec; rec = ihex_next_binrec(rec)) {
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if (!INTERNAL_RAM(be32_to_cpu(rec->addr))) {
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err = emi26_writememory(dev, be32_to_cpu(rec->addr),
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rec->data, be16_to_cpu(rec->len),
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ANCHOR_LOAD_EXTERNAL);
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if (err < 0)
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goto wraperr;
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}
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}
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/* Assert reset (stop the CPU in the EMI) */
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err = emi26_set_reset(dev,1);
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if (err < 0)
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goto wraperr;
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for (rec = (const struct ihex_binrec *)firmware_fw->data;
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rec; rec = ihex_next_binrec(rec)) {
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if (INTERNAL_RAM(be32_to_cpu(rec->addr))) {
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err = emi26_writememory(dev, be32_to_cpu(rec->addr),
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rec->data, be16_to_cpu(rec->len),
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ANCHOR_LOAD_INTERNAL);
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if (err < 0)
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goto wraperr;
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}
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}
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/* De-assert reset (let the CPU run) */
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err = emi26_set_reset(dev,0);
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if (err < 0)
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goto wraperr;
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msleep(250); /* let device settle */
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/* return 1 to fail the driver inialization
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* and give real driver change to load */
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err = 1;
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wraperr:
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if (err < 0)
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dev_err(&dev->dev,"%s - error loading firmware: error = %d\n",
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__func__, err);
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release_firmware(loader_fw);
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release_firmware(bitstream_fw);
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release_firmware(firmware_fw);
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kfree(buf);
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return err;
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}
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(EMI26_VENDOR_ID, EMI26_PRODUCT_ID) },
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{ USB_DEVICE(EMI26_VENDOR_ID, EMI26B_PRODUCT_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE (usb, id_table);
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static int emi26_probe(struct usb_interface *intf, const struct usb_device_id *id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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dev_info(&intf->dev, "%s start\n", __func__);
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emi26_load_firmware(dev);
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/* do not return the driver context, let real audio driver do that */
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return -EIO;
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}
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static void emi26_disconnect(struct usb_interface *intf)
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{
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}
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static struct usb_driver emi26_driver = {
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.name = "emi26 - firmware loader",
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.probe = emi26_probe,
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.disconnect = emi26_disconnect,
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.id_table = id_table,
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};
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module_usb_driver(emi26_driver);
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MODULE_AUTHOR("Tapio Laxström");
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MODULE_DESCRIPTION("Emagic EMI 2|6 firmware loader.");
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MODULE_LICENSE("GPL");
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MODULE_FIRMWARE("emi26/loader.fw");
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MODULE_FIRMWARE("emi26/bitstream.fw");
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MODULE_FIRMWARE("emi26/firmware.fw");
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/* vi:ai:syntax=c:sw=8:ts=8:tw=80
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*/
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