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