drivers/usb/misc/ezusb.c

   1 /*
   2  * EZ-USB specific functions used by some of the USB to Serial drivers.
   3  *
   4  * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <linux/usb.h>
  16 #include <linux/firmware.h>
  17 #include <linux/ihex.h>
  18 #include <linux/usb/ezusb.h>
  19
  20 struct ezusb_fx_type {
  21         /* EZ-USB Control and Status Register.  Bit 0 controls 8051 reset */
  22         unsigned short cpucs_reg;
  23         unsigned short max_internal_adress;
  24 };
  25
  26 static struct ezusb_fx_type ezusb_fx1 = {
  27         .cpucs_reg = 0x7F92,
  28         .max_internal_adress = 0x1B3F,
  29 };
  30
  31 /* Commands for writing to memory */
  32 #define WRITE_INT_RAM 0xA0
  33 #define WRITE_EXT_RAM 0xA3
  34
  35 static int ezusb_writememory(struct usb_device *dev, int address,
  36                                 unsigned char *data, int length, __u8 request)
  37 {
  38         int result;
  39         unsigned char *transfer_buffer;
  40
  41         if (!dev)
  42                 return -ENODEV;
  43
  44         transfer_buffer = kmemdup(data, length, GFP_KERNEL);
  45         if (!transfer_buffer) {
  46                 dev_err(&dev->dev, "%s - kmalloc(%d) failed.\n",
  47                                                         __func__, length);
  48                 return -ENOMEM;
  49         }
  50         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
  51                                  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  52                                  address, 0, transfer_buffer, length, 3000);
  53
  54         kfree(transfer_buffer);
  55         return result;
  56 }
  57
  58 static int ezusb_set_reset(struct usb_device *dev, unsigned short cpucs_reg,
  59                            unsigned char reset_bit)
  60 {
  61         int response = ezusb_writememory(dev, cpucs_reg, &reset_bit, 1, WRITE_INT_RAM);
  62         if (response < 0)
  63                 dev_err(&dev->dev, "%s-%d failed: %d\n",
  64                                                 __func__, reset_bit, response);
  65         return response;
  66 }
  67
  68 int ezusb_fx1_set_reset(struct usb_device *dev, unsigned char reset_bit)
  69 {
  70         return ezusb_set_reset(dev, ezusb_fx1.cpucs_reg, reset_bit);
  71 }
  72 EXPORT_SYMBOL_GPL(ezusb_fx1_set_reset);
  73
  74 static int ezusb_ihex_firmware_download(struct usb_device *dev,
  75                                         struct ezusb_fx_type fx,
  76                                         const char *firmware_path)
  77 {
  78         int ret = -ENOENT;
  79         const struct firmware *firmware = NULL;
  80         const struct ihex_binrec *record;
  81
  82         if (request_ihex_firmware(&firmware, firmware_path,
  83                                   &dev->dev)) {
  84                 dev_err(&dev->dev,
  85                         "%s - request \"%s\" failed\n",
  86                         __func__, firmware_path);
  87                 goto out;
  88         }
  89
  90         ret = ezusb_set_reset(dev, fx.cpucs_reg, 0);
  91         if (ret < 0)
  92                 goto out;
  93
  94         record = (const struct ihex_binrec *)firmware->data;
  95         for (; record; record = ihex_next_binrec(record)) {
  96                 if (be32_to_cpu(record->addr) > fx.max_internal_adress) {
  97                         ret = ezusb_writememory(dev, be32_to_cpu(record->addr),
  98                                                 (unsigned char *)record->data,
  99                                                 be16_to_cpu(record->len), WRITE_EXT_RAM);
 100                         if (ret < 0) {
 101                                 dev_err(&dev->dev, "%s - ezusb_writememory "
 102                                         "failed writing internal memory "
 103                                         "(%d %04X %p %d)\n", __func__, ret,
 104                                         be32_to_cpu(record->addr), record->data,
 105                                         be16_to_cpu(record->len));
 106                                 goto out;
 107                         }
 108                 }
 109         }
 110
 111         ret = ezusb_set_reset(dev, fx.cpucs_reg, 1);
 112         if (ret < 0)
 113                 goto out;
 114         record = (const struct ihex_binrec *)firmware->data;
 115         for (; record; record = ihex_next_binrec(record)) {
 116                 if (be32_to_cpu(record->addr) <= fx.max_internal_adress) {
 117                         ret = ezusb_writememory(dev, be32_to_cpu(record->addr),
 118                                                 (unsigned char *)record->data,
 119                                                 be16_to_cpu(record->len), WRITE_INT_RAM);
 120                         if (ret < 0) {
 121                                 dev_err(&dev->dev, "%s - ezusb_writememory "
 122                                         "failed writing external memory "
 123                                         "(%d %04X %p %d)\n", __func__, ret,
 124                                         be32_to_cpu(record->addr), record->data,
 125                                         be16_to_cpu(record->len));
 126                                 goto out;
 127                         }
 128                 }
 129         }
 130         ret = ezusb_set_reset(dev, fx.cpucs_reg, 0);
 131 out:
 132         release_firmware(firmware);
 133         return ret;
 134 }
 135
 136 int ezusb_fx1_ihex_firmware_download(struct usb_device *dev,
 137                                      const char *firmware_path)
 138 {
 139         return ezusb_ihex_firmware_download(dev, ezusb_fx1, firmware_path);
 140 }
 141 EXPORT_SYMBOL_GPL(ezusb_fx1_ihex_firmware_download);
 142
 143 #if 0
 144 /*
 145  * Once someone one needs these fx2 functions, uncomment them
 146  * and add them to ezusb.h and all should be good.
 147  */
 148 static struct ezusb_fx_type ezusb_fx2 = {
 149         .cpucs_reg = 0xE600,
 150         .max_internal_adress = 0x3FFF,
 151 };
 152
 153 int ezusb_fx2_set_reset(struct usb_device *dev, unsigned char reset_bit)
 154 {
 155         return ezusb_set_reset(dev, ezusb_fx2.cpucs_reg, reset_bit);
 156 }
 157 EXPORT_SYMBOL_GPL(ezusb_fx2_set_reset);
 158
 159 int ezusb_fx2_ihex_firmware_download(struct usb_device *dev,
 160                                      const char *firmware_path)
 161 {
 162         return ezusb_ihex_firmware_download(dev, ezusb_fx2, firmware_path);
 163 }
 164 EXPORT_SYMBOL_GPL(ezusb_fx2_ihex_firmware_download);
 165 #endif
 166
 167 MODULE_LICENSE("GPL");