common/spl/spl_ymodem.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000-2004
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  *
   6  * (C) Copyright 2011
   7  * Texas Instruments, <www.ti.com>
   8  *
   9  * Matt Porter <mporter@ti.com>
  10  */
  11 #include <common.h>
  12 #include <spl.h>
  13 #include <xyzModem.h>
  14 #include <asm/u-boot.h>
  15 #include <asm/utils.h>
  16 #include <linux/libfdt.h>
  17
  18 #define BUF_SIZE 1024
  19
  20 /*
  21  * Information required to load image using ymodem.
  22  *
  23  * @image_read: Now of bytes read from the image.
  24  * @buf: pointer to the previous read block.
  25  */
  26 struct ymodem_fit_info {
  27         int image_read;
  28         char *buf;
  29 };
  30
  31 static int getcymodem(void) {
  32         if (tstc())
  33                 return (getc());
  34         return -1;
  35 }
  36
  37 static ulong ymodem_read_fit(struct spl_load_info *load, ulong offset,
  38                              ulong size, void *addr)
  39 {
  40         int res, err;
  41         struct ymodem_fit_info *info = load->priv;
  42         char *buf = info->buf;
  43
  44         while (info->image_read < offset) {
  45                 res = xyzModem_stream_read(buf, BUF_SIZE, &err);
  46                 if (res <= 0)
  47                         return res;
  48                 info->image_read += res;
  49         }
  50
  51         if (info->image_read > offset) {
  52                 res = info->image_read - offset;
  53                 memcpy(addr, &buf[BUF_SIZE - res], res);
  54                 addr = addr + res;
  55         }
  56
  57         while (info->image_read < offset + size) {
  58                 res = xyzModem_stream_read(buf, BUF_SIZE, &err);
  59                 if (res <= 0)
  60                         return res;
  61
  62                 memcpy(addr, buf, res);
  63                 info->image_read += res;
  64                 addr += res;
  65         }
  66
  67         return size;
  68 }
  69
  70 static int spl_ymodem_load_image(struct spl_image_info *spl_image,
  71                                  struct spl_boot_device *bootdev)
  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(spl_image, &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                 ret = spl_parse_image_header(spl_image,
 112                                              (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 }
 134 SPL_LOAD_IMAGE_METHOD("UART", 0, BOOT_DEVICE_UART, spl_ymodem_load_image);