blob: ef818918bcdfcf3a3c141205701d45fd45206b8a [file] [log] [blame]
/* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <libfdt.h>
#include <dev_tree.h>
#include <lib/ptable.h>
#include <malloc.h>
#include <qpic_nand.h>
#include <stdlib.h>
#include <string.h>
#include <platform.h>
#include <board.h>
struct dt_entry_v1
{
uint32_t platform_id;
uint32_t variant_id;
uint32_t soc_rev;
uint32_t offset;
uint32_t size;
};
static struct dt_mem_node_info mem_node;
static int platform_dt_match(struct dt_entry *cur_dt_entry, uint32_t target_variant_id, uint32_t subtype_mask);
extern int target_is_emmc_boot(void);
extern uint32_t target_dev_tree_mem(void *fdt, uint32_t memory_node_offset);
/* TODO: This function needs to be moved to target layer to check violations
* against all the other regions as well.
*/
extern int check_aboot_addr_range_overlap(uint32_t start, uint32_t size);
/* Returns soc version if platform id and hardware id matches
otherwise return 0xFFFFFFFF */
#define INVALID_SOC_REV_ID 0XFFFFFFFF
static uint32_t dev_tree_compatible(void *dtb)
{
int root_offset;
const void *prop = NULL;
const char *plat_prop = NULL;
const char *board_prop = NULL;
char *model = NULL;
struct dt_entry cur_dt_entry;
struct dt_entry *dt_entry_v2 = NULL;
struct board_id *board_data = NULL;
struct plat_id *platform_data = NULL;
int len;
int len_board_id;
int len_plat_id;
int min_plat_id_len = 0;
uint32_t target_variant_id;
uint32_t dtb_ver;
uint32_t num_entries = 0;
uint32_t i, j, k;
uint32_t found = 0;
uint32_t msm_data_count;
uint32_t board_data_count;
uint32_t soc_rev;
root_offset = fdt_path_offset(dtb, "/");
if (root_offset < 0)
return false;
prop = fdt_getprop(dtb, root_offset, "model", &len);
if (prop && len > 0) {
model = (char *) malloc(sizeof(char) * len);
ASSERT(model);
strlcpy(model, prop, len);
} else {
model[0] = '\0';
}
/* Find the board-id prop from DTB , if board-id is present then
* the DTB is version 2 */
board_prop = (const char *)fdt_getprop(dtb, root_offset, "qcom,board-id", &len_board_id);
if (board_prop)
{
dtb_ver = DEV_TREE_VERSION_V2;
min_plat_id_len = PLAT_ID_SIZE;
}
else
{
dtb_ver = DEV_TREE_VERSION_V1;
min_plat_id_len = DT_ENTRY_V1_SIZE;
}
/* Get the msm-id prop from DTB */
plat_prop = (const char *)fdt_getprop(dtb, root_offset, "qcom,msm-id", &len_plat_id);
if (!plat_prop || len_plat_id <= 0) {
dprintf(INFO, "qcom,msm-id entry not found\n");
return false;
} else if (len_plat_id % min_plat_id_len) {
dprintf(INFO, "qcom,msm-id in device tree is (%d) not a multiple of (%d)\n",
len_plat_id, min_plat_id_len);
return false;
}
/*
* If DTB version is '1' look for <x y z> pair in the DTB
* x: platform_id
* y: variant_id
* z: SOC rev
*/
if (dtb_ver == DEV_TREE_VERSION_V1)
{
while (len_plat_id)
{
cur_dt_entry.platform_id = fdt32_to_cpu(((const struct dt_entry_v1 *)plat_prop)->platform_id);
cur_dt_entry.variant_id = fdt32_to_cpu(((const struct dt_entry_v1 *)plat_prop)->variant_id);
cur_dt_entry.soc_rev = fdt32_to_cpu(((const struct dt_entry_v1 *)plat_prop)->soc_rev);
cur_dt_entry.board_hw_subtype = board_hardware_subtype();
target_variant_id = board_hardware_id();
dprintf(SPEW, "Found an appended flattened device tree (%s - %u %u 0x%x)\n",
*model ? model : "unknown",
cur_dt_entry.platform_id, cur_dt_entry.variant_id, cur_dt_entry.soc_rev);
if (platform_dt_match(&cur_dt_entry, target_variant_id, 0) == 1)
{
dprintf(SPEW, "Device tree's msm_id doesn't match the board: <%u %u 0x%x> != <%u %u 0x%x>\n",
cur_dt_entry.platform_id,
cur_dt_entry.variant_id,
cur_dt_entry.soc_rev,
board_platform_id(),
board_hardware_id(),
board_soc_version());
plat_prop += DT_ENTRY_V1_SIZE;
len_plat_id -= DT_ENTRY_V1_SIZE;
continue;
}
else
{
found = 1;
break;
}
}
}
/*
* If DTB Version is '2' then we have split DTB with board & msm data
* populated saperately in board-id & msm-id prop respectively.
* Extract the data & prepare a look up table
*/
else if (dtb_ver == DEV_TREE_VERSION_V2)
{
board_data_count = (len_board_id / BOARD_ID_SIZE);
msm_data_count = (len_plat_id / PLAT_ID_SIZE);
/* If we are using dtb v2.0, then we have split board & msm data in the DTB */
board_data = (struct board_id *) malloc(sizeof(struct board_id) * (len_board_id / BOARD_ID_SIZE));
ASSERT(board_data);
platform_data = (struct plat_id *) malloc(sizeof(struct plat_id) * (len_plat_id / PLAT_ID_SIZE));
ASSERT(platform_data);
i = 0;
/* Extract board data from DTB */
for(i = 0 ; i < board_data_count; i++)
{
board_data[i].variant_id = fdt32_to_cpu(((struct board_id *)board_prop)->variant_id);
board_data[i].platform_subtype = fdt32_to_cpu(((struct board_id *)board_prop)->platform_subtype);
len_board_id -= sizeof(struct board_id);
board_prop += sizeof(struct board_id);
}
/* Extract platform data from DTB */
for(i = 0 ; i < msm_data_count; i++)
{
platform_data[i].platform_id = fdt32_to_cpu(((struct plat_id *)plat_prop)->platform_id);
platform_data[i].soc_rev = fdt32_to_cpu(((struct plat_id *)plat_prop)->soc_rev);
len_plat_id -= sizeof(struct plat_id);
plat_prop += sizeof(struct plat_id);
}
/* We need to merge board & platform data into dt entry structure */
num_entries = msm_data_count * board_data_count;
dt_entry_v2 = (struct dt_entry*) malloc(sizeof(struct dt_entry) * num_entries);
ASSERT(dt_entry_v2);
/* If we have '<X>; <Y>; <Z>' as platform data & '<A>; <B>; <C>' as board data.
* Then dt entry should look like
* <X ,A >;<X, B>;<X, C>;
* <Y ,A >;<Y, B>;<Y, C>;
* <Z ,A >;<Z, B>;<Z, C>;
*/
i = 0;
k = 0;
for (i = 0; i < msm_data_count; i++)
{
for (j = 0; j < board_data_count; j++)
{
dt_entry_v2[k].platform_id = platform_data[i].platform_id;
dt_entry_v2[k].soc_rev = platform_data[i].soc_rev;
dt_entry_v2[k].variant_id = board_data[j].variant_id;
dt_entry_v2[k].board_hw_subtype = board_data[j].platform_subtype;
k++;
}
}
/* Now find the matching entry in the merged list */
if (board_hardware_id() == HW_PLATFORM_QRD)
target_variant_id = board_target_id();
else
target_variant_id = board_hardware_id() | ((board_hardware_subtype() & 0xff) << 24);
for (i=0 ;i < num_entries; i++)
{
dprintf(SPEW, "Found an appended flattened device tree (%s - %u %u %u 0x%x)\n",
*model ? model : "unknown",
dt_entry_v2[i].platform_id, dt_entry_v2[i].variant_id, dt_entry_v2[i].board_hw_subtype, dt_entry_v2[i].soc_rev);
if (platform_dt_match(&dt_entry_v2[i], target_variant_id, 0xff) == 1)
{
dprintf(SPEW, "Device tree's msm_id doesn't match the board: <%u %u %u 0x%x> != <%u %u %u 0x%x>\n",
dt_entry_v2[i].platform_id,
dt_entry_v2[i].variant_id,
dt_entry_v2[i].soc_rev,
dt_entry_v2[i].board_hw_subtype,
board_platform_id(),
board_hardware_id(),
board_hardware_subtype(),
board_soc_version());
continue;
}
else
{
/* If found a match, return the cur_dt_entry */
found = 1;
cur_dt_entry = dt_entry_v2[i];
break;
}
}
}
if (!found)
{
soc_rev = INVALID_SOC_REV_ID;
goto end;
}
else
soc_rev = cur_dt_entry.soc_rev;
dprintf(INFO, "Device tree's msm_id matches the board: <%u %u %u 0x%x> == <%u %u %u 0x%x>\n",
cur_dt_entry.platform_id,
cur_dt_entry.variant_id,
cur_dt_entry.board_hw_subtype,
cur_dt_entry.soc_rev,
board_platform_id(),
board_hardware_id(),
board_hardware_subtype(),
board_soc_version());
end:
free(board_data);
free(platform_data);
free(dt_entry_v2);
free(model);
return soc_rev;
}
/*
* Will relocate the DTB to the tags addr if the device tree is found and return
* its address
*
* Arguments: kernel - Start address of the kernel loaded in RAM
* tags - Start address of the tags loaded in RAM
* kernel_size - Size of the kernel in bytes
*
* Return Value: DTB address : If appended device tree is found
* 'NULL' : Otherwise
*/
void *dev_tree_appended(void *kernel, uint32_t kernel_size, void *tags)
{
void *kernel_end = kernel + kernel_size;
uint32_t app_dtb_offset = 0;
void *dtb;
void *bestmatch_tag = NULL;
uint32_t bestmatch_tag_size;
uint32_t bestmatch_soc_rev_id = INVALID_SOC_REV_ID;
memcpy((void*) &app_dtb_offset, (void*) (kernel + DTB_OFFSET), sizeof(uint32_t));
dtb = kernel + app_dtb_offset;
while (dtb + sizeof(struct fdt_header) < kernel_end) {
uint32_t dtb_soc_rev_id;
struct fdt_header dtb_hdr;
uint32_t dtb_size;
/* the DTB could be unaligned, so extract the header,
* and operate on it separately */
memcpy(&dtb_hdr, dtb, sizeof(struct fdt_header));
if (fdt_check_header((const void *)&dtb_hdr) != 0 ||
(dtb + fdt_totalsize((const void *)&dtb_hdr) > kernel_end))
break;
dtb_size = fdt_totalsize(&dtb_hdr);
/* now that we know we have a valid DTB, we need to copy
* it somewhere aligned, like tags */
memcpy(tags, dtb, dtb_size);
dtb_soc_rev_id = dev_tree_compatible(tags);
if (dtb_soc_rev_id == board_soc_version()) {
/* clear out the old DTB magic so kernel doesn't find it */
*((uint32_t *)(kernel + app_dtb_offset)) = 0;
return tags;
} else if ((dtb_soc_rev_id != INVALID_SOC_REV_ID) &&
(dtb_soc_rev_id < board_soc_version())) {
/* if current bestmatch is less than new dtb_soc_rev_id then update
bestmatch_tag */
if((bestmatch_soc_rev_id == INVALID_SOC_REV_ID) ||
(bestmatch_soc_rev_id < dtb_soc_rev_id)) {
bestmatch_tag = dtb;
bestmatch_tag_size = dtb_size;
bestmatch_soc_rev_id = dtb_soc_rev_id;
}
}
/* goto the next device tree if any */
dtb += dtb_size;
}
if(bestmatch_tag) {
dprintf(INFO,"DTB found with bestmatch soc rev id 0x%x.Board soc rev id 0x%x\n",
bestmatch_soc_rev_id, board_soc_version());
memcpy(tags, bestmatch_tag, bestmatch_tag_size);
/* clear out the old DTB magic so kernel doesn't find it */
*((uint32_t *)(kernel + app_dtb_offset)) = 0;
return tags;
}
dprintf(CRITICAL, "DTB offset is incorrect, kernel image does not have appended DTB\n");
return NULL;
}
/* Returns 0 if the device tree is valid. */
int dev_tree_validate(struct dt_table *table, unsigned int page_size, uint32_t *dt_hdr_size)
{
int dt_entry_size;
uint32_t hdr_size;
/* Validate the device tree table header */
if(table->magic != DEV_TREE_MAGIC) {
dprintf(CRITICAL, "ERROR: Bad magic in device tree table \n");
return -1;
}
if (table->version == DEV_TREE_VERSION_V1) {
dt_entry_size = sizeof(struct dt_entry_v1);
} else if (table->version == DEV_TREE_VERSION_V2) {
dt_entry_size = sizeof(struct dt_entry);
} else {
dprintf(CRITICAL, "ERROR: Unsupported version (%d) in DT table \n",
table->version);
return -1;
}
hdr_size = table->num_entries * dt_entry_size + DEV_TREE_HEADER_SIZE;
/* Roundup to page_size. */
hdr_size = ROUNDUP(hdr_size, page_size);
*dt_hdr_size = hdr_size;
return 0;
}
static int platform_dt_match(struct dt_entry *cur_dt_entry, uint32_t target_variant_id, uint32_t subtype_mask)
{
/* 1. must match the platform_id, hardware_id, platform_version
* 2. soc rev number equal then return 0
* 3. dt soc rev number less than cdt return -1
* 4. otherwise return 1
*/
uint32_t cur_dt_target_id ;
cur_dt_target_id = cur_dt_entry->variant_id | ((cur_dt_entry->board_hw_subtype & subtype_mask & 0xff) << 24);
if((cur_dt_entry->platform_id == board_platform_id()) &&
(cur_dt_target_id == target_variant_id)) {
if(cur_dt_entry->soc_rev == board_soc_version()) {
return 0;
} else if(cur_dt_entry->soc_rev < board_soc_version()) {
return -1;
}
}
return 1;
}
static int __dev_tree_get_entry_info(struct dt_table *table, struct dt_entry *dt_entry_info,
uint32_t target_variant_id, uint32_t subtype_mask)
{
uint32_t i;
unsigned char *table_ptr;
struct dt_entry dt_entry_buf_1;
struct dt_entry dt_entry_buf_2;
struct dt_entry *cur_dt_entry;
struct dt_entry *best_match_dt_entry;
struct dt_entry_v1 *dt_entry_v1;
uint32_t found = 0;
if (!dt_entry_info) {
dprintf(CRITICAL, "ERROR: Bad parameter passed to %s \n",
__func__);
return -1;
}
table_ptr = (unsigned char *)table + DEV_TREE_HEADER_SIZE;
cur_dt_entry = &dt_entry_buf_1;
best_match_dt_entry = NULL;
for(i = 0; found == 0 && i < table->num_entries; i++)
{
memset(cur_dt_entry, 0, sizeof(struct dt_entry));
switch(table->version) {
case DEV_TREE_VERSION_V1:
dt_entry_v1 = (struct dt_entry_v1 *)table_ptr;
cur_dt_entry->platform_id = dt_entry_v1->platform_id;
cur_dt_entry->variant_id = dt_entry_v1->variant_id;
cur_dt_entry->soc_rev = dt_entry_v1->soc_rev;
cur_dt_entry->board_hw_subtype = board_hardware_subtype();
cur_dt_entry->offset = dt_entry_v1->offset;
cur_dt_entry->size = dt_entry_v1->size;
table_ptr += sizeof(struct dt_entry_v1);
break;
case DEV_TREE_VERSION_V2:
memcpy(cur_dt_entry, (struct dt_entry *)table_ptr,
sizeof(struct dt_entry));
table_ptr += sizeof(struct dt_entry);
break;
default:
dprintf(CRITICAL, "ERROR: Unsupported version (%d) in DT table \n",
table->version);
return -1;
}
/* DTBs are stored in the ascending order of soc revision.
* For eg: Rev0..Rev1..Rev2 & so on.
* we pickup the DTB with highest soc rev number which is less
* than or equal to actual hardware
*/
switch(platform_dt_match(cur_dt_entry, target_variant_id, subtype_mask)) {
case 0:
best_match_dt_entry = cur_dt_entry;
found = 1;
break;
case -1:
if (!best_match_dt_entry) {
/* copy structure */
best_match_dt_entry = cur_dt_entry;
cur_dt_entry = &dt_entry_buf_2;
} else {
/* Swap dt_entry buffers */
struct dt_entry *temp = cur_dt_entry;
cur_dt_entry = best_match_dt_entry;
best_match_dt_entry = temp;
}
default:
break;
}
}
if (best_match_dt_entry) {
*dt_entry_info = *best_match_dt_entry;
found = 1;
}
if (found != 0) {
dprintf(INFO, "Using DTB entry %u/%08x/%u/%u for device %u/%08x/%u/%u\n",
dt_entry_info->platform_id, dt_entry_info->soc_rev,
dt_entry_info->variant_id, dt_entry_info->board_hw_subtype,
board_platform_id(), board_soc_version(),
board_hardware_id(), board_hardware_subtype());
return 0;
}
dprintf(CRITICAL, "ERROR: Unable to find suitable device tree for device (%u/0x%08x/%u/%u)\n",
board_platform_id(), board_soc_version(),
board_hardware_id(), board_hardware_subtype());
return -1;
}
/* Function to obtain the index information for the correct device tree
* based on the platform data.
* If a matching device tree is found, the information is returned in the
* "dt_entry_info" out parameter and a function value of 0 is returned, otherwise
* a non-zero function value is returned.
*/
int dev_tree_get_entry_info(struct dt_table *table, struct dt_entry *dt_entry_info)
{
uint32_t target_variant_id;
if(board_hardware_id() == HW_PLATFORM_QRD) {
target_variant_id = board_target_id();
if (__dev_tree_get_entry_info(table, dt_entry_info, target_variant_id, 0xff) == 0) {
return 0;
}
}
/*
* for compatible with version 1 and version 2 dtbtool
* will compare the subtype inside the variant id
*/
target_variant_id = board_hardware_id() | ((board_hardware_subtype() & 0xff) << 24);
if (__dev_tree_get_entry_info(table, dt_entry_info, target_variant_id, 0xff) == 0) {
return 0;
}
/*
* add compatible with old device selection method which don't compare subtype
*/
target_variant_id = board_hardware_id();
return __dev_tree_get_entry_info(table, dt_entry_info, target_variant_id, 0);
}
/* Function to add the first RAM partition info to the device tree.
* Note: The function replaces the reg property in the "/memory" node
* with the addr and size provided.
*/
int dev_tree_add_first_mem_info(uint32_t *fdt, uint32_t offset, uint32_t addr, uint32_t size)
{
int ret;
ret = fdt_setprop_u32(fdt, offset, "reg", addr);
if (ret)
{
dprintf(CRITICAL, "Failed to add the memory information addr: %d\n",
ret);
}
ret = fdt_appendprop_u32(fdt, offset, "reg", size);
if (ret)
{
dprintf(CRITICAL, "Failed to add the memory information size: %d\n",
ret);
}
return ret;
}
static int dev_tree_query_memory_cell_sizes(void *fdt, struct dt_mem_node_info *mem_node, uint32_t mem_node_offset)
{
int len;
uint32_t *valp;
int ret;
uint32_t offset;
mem_node->offset = mem_node_offset;
/* Get offset of the root node */
ret = fdt_path_offset(fdt, "/");
if (ret < 0)
{
dprintf(CRITICAL, "Could not find memory node.\n");
return ret;
}
offset = ret;
/* Find the #address-cells size. */
valp = (uint32_t*)fdt_getprop(fdt, offset, "#address-cells", &len);
if (len <= 0)
{
if (len == -FDT_ERR_NOTFOUND)
{
/* Property not found.
* Assume standard sizes.
*/
mem_node->addr_cell_size = 2;
dprintf(CRITICAL, "Using default #addr_cell_size: %u\n", mem_node->addr_cell_size);
}
else
{
dprintf(CRITICAL, "Error finding the #address-cells property\n");
return len;
}
}
else
mem_node->addr_cell_size = fdt32_to_cpu(*valp);
/* Find the #size-cells size. */
valp = (uint32_t*)fdt_getprop(fdt, offset, "#size-cells", &len);
if (len <= 0)
{
if (len == -FDT_ERR_NOTFOUND)
{
/* Property not found.
* Assume standard sizes.
*/
mem_node->size_cell_size = 1;
dprintf(CRITICAL, "Using default #size_cell_size: %u\n", mem_node->size_cell_size);
}
else
{
dprintf(CRITICAL, "Error finding the #size-cells property\n");
return len;
}
}
else
mem_node->size_cell_size = fdt32_to_cpu(*valp);
return 0;
}
static void dev_tree_update_memory_node(uint32_t offset)
{
mem_node.offset = offset;
mem_node.addr_cell_size = 1;
mem_node.size_cell_size = 1;
}
/* Function to add the subsequent RAM partition info to the device tree. */
int dev_tree_add_mem_info(void *fdt, uint32_t offset, uint64_t addr, uint64_t size)
{
int ret = 0;
if(smem_get_ram_ptable_version() >= 1)
{
ret = dev_tree_query_memory_cell_sizes(fdt, &mem_node, offset);
if (ret < 0)
{
dprintf(CRITICAL, "Could not find #address-cells and #size-cells properties: ret %d\n", ret);
return ret;
}
}
else
{
dev_tree_update_memory_node(offset);
}
if (!(mem_node.mem_info_cnt))
{
/* Replace any other reg prop in the memory node. */
/* cell_size is the number of 32 bit words used to represent an address/length in the device tree.
* memory node in DT can be either 32-bit(cell-size = 1) or 64-bit(cell-size = 2).So when updating
* the memory node in the device tree, we write one word or two words based on cell_size = 1 or 2.
*/
if(mem_node.addr_cell_size == 2)
{
ret = fdt_setprop_u32(fdt, mem_node.offset, "reg", addr >> 32);
if(ret)
{
dprintf(CRITICAL, "ERROR: Could not set prop reg for memory node\n");
return ret;
}
ret = fdt_appendprop_u32(fdt, mem_node.offset, "reg", (uint32_t)addr);
if(ret)
{
dprintf(CRITICAL, "ERROR: Could not append prop reg for memory node\n");
return ret;
}
}
else
{
ret = fdt_setprop_u32(fdt, mem_node.offset, "reg", (uint32_t)addr);
if(ret)
{
dprintf(CRITICAL, "ERROR: Could not set prop reg for memory node\n");
return ret;
}
}
mem_node.mem_info_cnt = 1;
}
else
{
/* Append the mem info to the reg prop for subsequent nodes. */
if(mem_node.addr_cell_size == 2)
{
ret = fdt_appendprop_u32(fdt, mem_node.offset, "reg", addr >> 32);
if(ret)
{
dprintf(CRITICAL, "ERROR: Could not append prop reg for memory node\n");
return ret;
}
}
ret = fdt_appendprop_u32(fdt, mem_node.offset, "reg", (uint32_t)addr);
if(ret)
{
dprintf(CRITICAL, "ERROR: Could not append prop reg for memory node\n");
return ret;
}
}
if(mem_node.size_cell_size == 2)
{
ret = fdt_appendprop_u32(fdt, mem_node.offset, "reg", size>>32);
if(ret)
{
dprintf(CRITICAL, "ERROR: Could not append prop reg for memory node\n");
return ret;
}
}
ret = fdt_appendprop_u32(fdt, mem_node.offset, "reg", (uint32_t)size);
if (ret)
{
dprintf(CRITICAL, "Failed to add the memory information size: %d\n",
ret);
return ret;
}
return ret;
}
/* Top level function that updates the device tree. */
int update_device_tree(void *fdt, const char *cmdline,
void *ramdisk, uint32_t ramdisk_size)
{
int ret = 0;
uint32_t offset;
/* Check the device tree header */
ret = fdt_check_header(fdt);
if (ret)
{
dprintf(CRITICAL, "Invalid device tree header \n");
return ret;
}
/* Add padding to make space for new nodes and properties. */
ret = fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + DTB_PAD_SIZE);
if (ret!= 0)
{
dprintf(CRITICAL, "Failed to move/resize dtb buffer: %d\n", ret);
return ret;
}
/* Get offset of the memory node */
ret = fdt_path_offset(fdt, "/memory");
if (ret < 0)
{
dprintf(CRITICAL, "Could not find memory node.\n");
return ret;
}
offset = ret;
ret = target_dev_tree_mem(fdt, offset);
if(ret)
{
dprintf(CRITICAL, "ERROR: Cannot update memory node\n");
return ret;
}
/* Get offset of the chosen node */
ret = fdt_path_offset(fdt, "/chosen");
if (ret < 0)
{
dprintf(CRITICAL, "Could not find chosen node.\n");
return ret;
}
offset = ret;
/* Adding the cmdline to the chosen node */
ret = fdt_setprop_string(fdt, offset, (const char*)"bootargs", (const void*)cmdline);
if (ret)
{
dprintf(CRITICAL, "ERROR: Cannot update chosen node [bootargs]\n");
return ret;
}
/* Adding the initrd-start to the chosen node */
ret = fdt_setprop_u32(fdt, offset, "linux,initrd-start", (uint32_t)ramdisk);
if (ret)
{
dprintf(CRITICAL, "ERROR: Cannot update chosen node [linux,initrd-start]\n");
return ret;
}
/* Adding the initrd-end to the chosen node */
ret = fdt_setprop_u32(fdt, offset, "linux,initrd-end", ((uint32_t)ramdisk + ramdisk_size));
if (ret)
{
dprintf(CRITICAL, "ERROR: Cannot update chosen node [linux,initrd-end]\n");
return ret;
}
fdt_pack(fdt);
return ret;
}