common/spl/spl_ymodem.c

   1 /*
   2  * (C) Copyright 2000-2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2011
   6  * Texas Instruments, <www.ti.com>
   7  *
   8  * Matt Porter <mporter@ti.com>
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12 #include <common.h>
  13 #include <spl.h>
  14 #include <xyzModem.h>
  15 #include <asm/u-boot.h>
  16 #include <asm/utils.h>
  17 #include <libfdt.h>
  18
  19 #define BUF_SIZE 1024
  20
  21 /*
  22  * Information required to load image using ymodem.
  23  *
  24  * @image_read: Now of bytes read from the image.
  25  * @buf: pointer to the previous read block.
  26  */
  27 struct ymodem_fit_info {
  28         int image_read;
  29         char *buf;
  30 };
  31
  32 static int getcymodem(void) {
  33         if (tstc())
  34                 return (getc());
  35         return -1;
  36 }
  37
  38 static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
  39                              ulong size, void *addr)
  40 {
  41         int res, err;
  42         struct ymodem_fit_info *info = load->priv;
  43         char *buf = info->buf;
  44
  45         while (info->image_read < offset) {
  46                 res = xyzModem_stream_read(buf, BUF_SIZE, &err);
  47                 if (res <= 0)
  48                         return res;
  49                 info->image_read += res;
  50         }
  51
  52         if (info->image_read > offset) {
  53                 res = info->image_read - offset;
  54                 memcpy(addr, &buf[BUF_SIZE - res], res);
  55                 addr = addr + res;
  56         }
  57
  58         while (info->image_read < offset + size) {
  59                 res = xyzModem_stream_read(buf, BUF_SIZE, &err);
  60                 if (res <= 0)
  61                         return res;
  62
  63                 memcpy(addr, buf, res);
  64                 info->image_read += res;
  65                 addr += res;
  66         }
  67
  68         return size;
  69 }
  70
  71 int spl_ymodem_load_image(void)
  72 {
  73         int size = 0;
  74         int err;
  75         int res;
  76         int ret;
  77         connection_info_t info;
  78         char buf[BUF_SIZE];
  79         ulong addr = 0;
  80
  81         info.mode = xyzModem_ymodem;
  82         ret = xyzModem_stream_open(&info, &err);
  83         if (ret) {
  84                 printf("spl: ymodem err - %s\n", xyzModem_error(err));
  85                 return ret;
  86         }
  87
  88         res = xyzModem_stream_read(buf, BUF_SIZE, &err);
  89         if (res <= 0)
  90                 goto end_stream;
  91
  92         if (IS_ENABLED(CONFIG_SPL_LOAD_FIT) &&
  93             image_get_magic((struct image_header *)buf) == FDT_MAGIC) {
  94                 struct spl_load_info load;
  95                 struct ymodem_fit_info info;
  96
  97                 debug("Found FIT\n");
  98                 load.dev = NULL;
  99                 load.priv = (void *)&info;
 100                 load.filename = NULL;
 101                 load.bl_len = 1;
 102                 info.buf = buf;
 103                 info.image_read = BUF_SIZE;
 104                 load.read = ymodem_read_fit;
 105                 ret =  spl_load_simple_fit(&load, 0, (void *)buf);
 106                 size = info.image_read;
 107
 108                 while ((res = xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0)
 109                         size += res;
 110         } else {
 111                 spl_parse_image_header((struct image_header *)buf);
 112                 ret = spl_parse_image_header((struct image_header *)buf);
 113                 if (ret)
 114                         return ret;
 115                 addr = spl_image.load_addr;
 116                 memcpy((void *)addr, buf, res);
 117                 size += res;
 118                 addr += res;
 119
 120                 while ((res = xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0) {
 121                         memcpy((void *)addr, buf, res);
 122                         size += res;
 123                         addr += res;
 124                 }
 125         }
 126
 127 end_stream:
 128         xyzModem_stream_close(&err);
 129         xyzModem_stream_terminate(false, &getcymodem);
 130
 131         printf("Loaded %d bytes\n", size);
 132         return 0;
 133 }