| /* 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> |
| |
| #define min(a,b) ((a) < (b) ? (a) : (b)) |
| |
| extern int target_is_emmc_boot(void); |
| extern uint32_t target_dev_tree_mem(void *fdt, uint32_t memory_node_offset); |
| |
| struct msm_id |
| { |
| uint32_t platform_id; |
| uint32_t hardware_id; |
| uint32_t soc_rev; |
| }; |
| |
| static bool is_dev_tree_compatible(void *dtb) |
| { |
| int root_offset; |
| const void *prop; |
| char model[128]; |
| struct msm_id msm_id; |
| int len; |
| |
| root_offset = fdt_path_offset(dtb, "/"); |
| if (root_offset < 0) |
| return false; |
| |
| prop = fdt_getprop(dtb, root_offset, "model", &len); |
| if (prop && len > 0) { |
| memcpy(model, prop, min((int)sizeof(model), len)); |
| model[sizeof(model) - 1] = '\0'; |
| } else { |
| model[0] = '\0'; |
| } |
| |
| prop = fdt_getprop(dtb, root_offset, "qcom,msm-id", &len); |
| if (!prop || len <= 0) { |
| dprintf(INFO, "qcom,msm-id entry not found\n"); |
| return false; |
| } else if (len < (int)sizeof(struct msm_id)) { |
| dprintf(INFO, "qcom,msm-id entry size mismatch (%d != %d)\n", |
| len, sizeof(struct msm_id)); |
| return false; |
| } |
| msm_id.platform_id = fdt32_to_cpu(((const struct msm_id *)prop)->platform_id); |
| msm_id.hardware_id = fdt32_to_cpu(((const struct msm_id *)prop)->hardware_id); |
| msm_id.soc_rev = fdt32_to_cpu(((const struct msm_id *)prop)->soc_rev); |
| |
| dprintf(INFO, "Found an appended flattened device tree (%s - %d %d 0x%x)\n", |
| *model ? model : "unknown", |
| msm_id.platform_id, msm_id.hardware_id, msm_id.soc_rev); |
| |
| if (msm_id.platform_id != board_platform_id() || |
| msm_id.hardware_id != board_hardware_id() || |
| msm_id.soc_rev != board_soc_version()) { |
| dprintf(INFO, "Device tree's msm_id doesn't match the board: <%d %d 0x%x> != <%d %d 0x%x>\n", |
| msm_id.platform_id, |
| msm_id.hardware_id, |
| msm_id.soc_rev, |
| board_platform_id(), |
| board_hardware_id(), |
| board_soc_version()); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /* |
| * 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 |
| * 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; |
| |
| 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) { |
| bool compat; |
| 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); |
| |
| compat = is_dev_tree_compatible(tags); |
| if (compat) { |
| /* clear out the old DTB magic so kernel doesn't find it */ |
| *((uint32_t *)(kernel + app_dtb_offset)) = 0; |
| return tags; |
| } |
| |
| /* goto the next device tree if any */ |
| dtb += dtb_size; |
| } |
| |
| return NULL; |
| } |
| |
| /* Function to return the pointer to the start of the correct device tree |
| * based on the platform data. |
| */ |
| struct dt_entry * dev_tree_get_entry_ptr(struct dt_table *table) |
| { |
| uint32_t i; |
| struct dt_entry *dt_entry_ptr; |
| struct dt_entry *latest_dt_entry = NULL; |
| |
| dt_entry_ptr = (struct dt_entry *)((char *)table + DEV_TREE_HEADER_SIZE); |
| |
| for(i = 0; i < table->num_entries; i++) |
| { |
| /* 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 |
| */ |
| if((dt_entry_ptr->platform_id == board_platform_id()) && |
| (dt_entry_ptr->variant_id == board_hardware_id()) && |
| (dt_entry_ptr->soc_rev == board_soc_version())) |
| { |
| return dt_entry_ptr; |
| } |
| /* if the exact match not found, return the closest match |
| * assuming it to be the nearest soc version |
| */ |
| if((dt_entry_ptr->platform_id == board_platform_id()) && |
| (dt_entry_ptr->variant_id == board_hardware_id()) && |
| (dt_entry_ptr->soc_rev <= board_soc_version())) { |
| latest_dt_entry = dt_entry_ptr; |
| } |
| dt_entry_ptr++; |
| } |
| |
| if (latest_dt_entry) { |
| dprintf(SPEW, "Loading DTB with SOC version:%x\n", latest_dt_entry->soc_rev); |
| return latest_dt_entry; |
| } |
| |
| return NULL; |
| } |
| |
| /* 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; |
| } |
| |
| /* Function to add the subsequent RAM partition info to the device tree. */ |
| int dev_tree_add_mem_info(void *fdt, uint32_t offset, uint32_t addr, uint32_t size) |
| { |
| static int mem_info_cnt = 0; |
| int ret; |
| |
| if (!mem_info_cnt) |
| { |
| /* Replace any other reg prop in the memory node. */ |
| ret = fdt_setprop_u32(fdt, offset, "reg", addr); |
| mem_info_cnt = 1; |
| } |
| else |
| { |
| /* Append the mem info to the reg prop for subsequent nodes. */ |
| ret = fdt_appendprop_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; |
| } |
| |
| /* 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; |
| } |