drivers/dfu/dfu_ram.c

   1 /*
   2  * (C) Copyright 2013
   3  * Afzal Mohammed <afzal.mohd.ma@gmail.com>
   4  *
   5  * Reference: dfu_mmc.c
   6  * Copyright (C) 2012 Samsung Electronics
   7  * author: Lukasz Majewski <l.majewski@samsung.com>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <malloc.h>
  14 #include <errno.h>
  15 #include <dfu.h>
  16
  17 static int dfu_transfer_medium_ram(enum dfu_op op, struct dfu_entity *dfu,
  18                                    u64 offset, void *buf, long *len)
  19 {
  20         if (dfu->layout != DFU_RAM_ADDR) {
  21                 pr_err("unsupported layout: %s\n", dfu_get_layout(dfu->layout));
  22                 return  -EINVAL;
  23         }
  24
  25         if (offset > dfu->data.ram.size) {
  26                 pr_err("request exceeds allowed area\n");
  27                 return -EINVAL;
  28         }
  29
  30         if (op == DFU_OP_WRITE)
  31                 memcpy(dfu->data.ram.start + offset, buf, *len);
  32         else
  33                 memcpy(buf, dfu->data.ram.start + offset, *len);
  34
  35         return 0;
  36 }
  37
  38 static int dfu_write_medium_ram(struct dfu_entity *dfu, u64 offset,
  39                                 void *buf, long *len)
  40 {
  41         return dfu_transfer_medium_ram(DFU_OP_WRITE, dfu, offset, buf, len);
  42 }
  43
  44 int dfu_get_medium_size_ram(struct dfu_entity *dfu, u64 *size)
  45 {
  46         *size = dfu->data.ram.size;
  47
  48         return 0;
  49 }
  50
  51 static int dfu_read_medium_ram(struct dfu_entity *dfu, u64 offset,
  52                                void *buf, long *len)
  53 {
  54         return dfu_transfer_medium_ram(DFU_OP_READ, dfu, offset, buf, len);
  55 }
  56
  57 int dfu_fill_entity_ram(struct dfu_entity *dfu, char *devstr, char *s)
  58 {
  59         const char *argv[3];
  60         const char **parg = argv;
  61
  62         for (; parg < argv + sizeof(argv) / sizeof(*argv); ++parg) {
  63                 *parg = strsep(&s, " ");
  64                 if (*parg == NULL) {
  65                         pr_err("Invalid number of arguments.\n");
  66                         return -ENODEV;
  67                 }
  68         }
  69
  70         dfu->dev_type = DFU_DEV_RAM;
  71         if (strcmp(argv[0], "ram")) {
  72                 pr_err("unsupported device: %s\n", argv[0]);
  73                 return -ENODEV;
  74         }
  75
  76         dfu->layout = DFU_RAM_ADDR;
  77         dfu->data.ram.start = (void *)simple_strtoul(argv[1], NULL, 16);
  78         dfu->data.ram.size = simple_strtoul(argv[2], NULL, 16);
  79
  80         dfu->write_medium = dfu_write_medium_ram;
  81         dfu->get_medium_size = dfu_get_medium_size_ram;
  82         dfu->read_medium = dfu_read_medium_ram;
  83
  84         dfu->inited = 0;
  85
  86         return 0;
  87 }