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