diff options
Diffstat (limited to 'arch/arm/mach-tegra/tegra186/nvtboot_mem.c')
| -rw-r--r-- | arch/arm/mach-tegra/tegra186/nvtboot_mem.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/arch/arm/mach-tegra/tegra186/nvtboot_mem.c b/arch/arm/mach-tegra/tegra186/nvtboot_mem.c deleted file mode 100644 index 62142821a5..0000000000 --- a/arch/arm/mach-tegra/tegra186/nvtboot_mem.c +++ /dev/null @@ -1,172 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright (c) 2016-2018, NVIDIA CORPORATION. - */ - -#include <common.h> -#include <fdt_support.h> -#include <fdtdec.h> -#include <linux/sizes.h> -#include <asm/arch/tegra.h> -#include <asm/armv8/mmu.h> - -/* - * Size of a region that's large enough to hold the relocated U-Boot and all - * other allocations made around it (stack, heap, page tables, etc.) - * In practice, running "bdinfo" at the shell prompt, the stack reaches about - * 5MB from the address selected for ram_top as of the time of writing, - * so a 16MB region should be plenty. - */ -#define MIN_USABLE_RAM_SIZE SZ_16M -/* - * The amount of space we expect to require for stack usage. Used to validate - * that all reservations fit into the region selected for the relocation target - */ -#define MIN_USABLE_STACK_SIZE SZ_1M - -DECLARE_GLOBAL_DATA_PTR; - -extern unsigned long nvtboot_boot_x0; -extern struct mm_region tegra_mem_map[]; - -/* - * These variables are written to before relocation, and hence cannot be - * in.bss, since .bss overlaps the DTB that's appended to the U-Boot binary. - * The section attribute forces this into .data and avoids this issue. This - * also has the nice side-effect of the content being valid after relocation. - */ - -/* The number of valid entries in ram_banks[] */ -static int ram_bank_count __attribute__((section(".data"))); - -/* - * The usable top-of-RAM for U-Boot. This is both: - * a) Below 4GB to avoid issues with peripherals that use 32-bit addressing. - * b) At the end of a region that has enough space to hold the relocated U-Boot - * and all other allocations made around it (stack, heap, page tables, etc.) - */ -static u64 ram_top __attribute__((section(".data"))); -/* The base address of the region of RAM that ends at ram_top */ -static u64 region_base __attribute__((section(".data"))); - -int dram_init(void) -{ - unsigned int na, ns; - const void *nvtboot_blob = (void *)nvtboot_boot_x0; - int node, len, i; - const u32 *prop; - - na = fdtdec_get_uint(nvtboot_blob, 0, "#address-cells", 2); - ns = fdtdec_get_uint(nvtboot_blob, 0, "#size-cells", 2); - - node = fdt_path_offset(nvtboot_blob, "/memory"); - if (node < 0) { - pr_err("Can't find /memory node in nvtboot DTB"); - hang(); - } - prop = fdt_getprop(nvtboot_blob, node, "reg", &len); - if (!prop) { - pr_err("Can't find /memory/reg property in nvtboot DTB"); - hang(); - } - - /* Calculate the true # of base/size pairs to read */ - len /= 4; /* Convert bytes to number of cells */ - len /= (na + ns); /* Convert cells to number of banks */ - if (len > CONFIG_NR_DRAM_BANKS) - len = CONFIG_NR_DRAM_BANKS; - - /* Parse the /memory node, and save useful entries */ - gd->ram_size = 0; - ram_bank_count = 0; - for (i = 0; i < len; i++) { - u64 bank_start, bank_end, bank_size, usable_bank_size; - - /* Extract raw memory region data from DTB */ - bank_start = fdt_read_number(prop, na); - prop += na; - bank_size = fdt_read_number(prop, ns); - prop += ns; - gd->ram_size += bank_size; - bank_end = bank_start + bank_size; - debug("Bank %d: %llx..%llx (+%llx)\n", i, - bank_start, bank_end, bank_size); - - /* - * Align the bank to MMU section size. This is not strictly - * necessary, since the translation table construction code - * handles page granularity without issue. However, aligning - * the MMU entries reduces the size and number of levels in the - * page table, so is worth it. - */ - bank_start = ROUND(bank_start, SZ_2M); - bank_end = bank_end & ~(SZ_2M - 1); - bank_size = bank_end - bank_start; - debug(" aligned: %llx..%llx (+%llx)\n", - bank_start, bank_end, bank_size); - if (bank_end <= bank_start) - continue; - - /* Record data used to create MMU translation tables */ - ram_bank_count++; - /* Index below is deliberately 1-based to skip MMIO entry */ - tegra_mem_map[ram_bank_count].virt = bank_start; - tegra_mem_map[ram_bank_count].phys = bank_start; - tegra_mem_map[ram_bank_count].size = bank_size; - tegra_mem_map[ram_bank_count].attrs = - PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE; - - /* Determine best bank to relocate U-Boot into */ - if (bank_end > SZ_4G) - bank_end = SZ_4G; - debug(" end %llx (usable)\n", bank_end); - usable_bank_size = bank_end - bank_start; - debug(" size %llx (usable)\n", usable_bank_size); - if ((usable_bank_size >= MIN_USABLE_RAM_SIZE) && - (bank_end > ram_top)) { - ram_top = bank_end; - region_base = bank_start; - debug("ram top now %llx\n", ram_top); - } - } - - /* Ensure memory map contains the desired sentinel entry */ - tegra_mem_map[ram_bank_count + 1].virt = 0; - tegra_mem_map[ram_bank_count + 1].phys = 0; - tegra_mem_map[ram_bank_count + 1].size = 0; - tegra_mem_map[ram_bank_count + 1].attrs = 0; - - /* Error out if a relocation target couldn't be found */ - if (!ram_top) { - pr_err("Can't find a usable RAM top"); - hang(); - } - - return 0; -} - -int dram_init_banksize(void) -{ - int i; - - if ((gd->start_addr_sp - region_base) < MIN_USABLE_STACK_SIZE) { - pr_err("Reservations exceed chosen region size"); - hang(); - } - - for (i = 0; i < ram_bank_count; i++) { - gd->bd->bi_dram[i].start = tegra_mem_map[1 + i].virt; - gd->bd->bi_dram[i].size = tegra_mem_map[1 + i].size; - } - -#ifdef CONFIG_PCI - gd->pci_ram_top = ram_top; -#endif - - return 0; -} - -ulong board_get_usable_ram_top(ulong total_size) -{ - return ram_top; -} |