168 lines
3.4 KiB
C
168 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
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*/
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#include <common.h>
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#include <env.h>
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#include <init.h>
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#include <log.h>
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#include <stdlib.h>
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#include <asm/global_data.h>
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#include <asm/setup.h>
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#include <asm/system.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Parse atags provided by Samsung bootloader to get available memory */
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static ulong fw_mach __section(".data");
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static ulong fw_atags __section(".data");
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static const struct tag *fw_atags_copy;
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static uint fw_atags_size;
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void save_boot_params(ulong r0, ulong r1, ulong r2, ulong r3)
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{
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fw_mach = r1;
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fw_atags = r2;
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save_boot_params_ret();
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}
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static const struct tag *fw_atags_get(void)
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{
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const struct tag *tags = (const struct tag *)fw_atags;
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if (tags->hdr.tag != ATAG_CORE) {
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log_err("Invalid atags: tag 0x%x at %p\n", tags->hdr.tag, tags);
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return NULL;
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}
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return tags;
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}
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int dram_init(void)
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{
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const struct tag *t, *tags = fw_atags_get();
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if (!tags)
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return -EINVAL;
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for_each_tag(t, tags) {
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if (t->hdr.tag != ATAG_MEM)
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continue;
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debug("Memory: %#x-%#x (size %#x)\n", t->u.mem.start,
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t->u.mem.start + t->u.mem.size, t->u.mem.size);
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gd->ram_size += t->u.mem.size;
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}
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return 0;
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}
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int dram_init_banksize(void)
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{
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const struct tag *t, *tags = fw_atags_get();
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unsigned int bank = 0;
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if (!tags)
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return -EINVAL;
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for_each_tag(t, tags) {
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if (t->hdr.tag != ATAG_MEM)
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continue;
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gd->bd->bi_dram[bank].start = t->u.mem.start;
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gd->bd->bi_dram[bank].size = t->u.mem.size;
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if (++bank == CONFIG_NR_DRAM_BANKS)
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break;
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}
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return 0;
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}
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int board_init(void)
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{
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gd->bd->bi_arch_number = fw_mach;
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gd->bd->bi_boot_params = fw_atags;
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return 0;
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}
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static void parse_serial(const struct tag_serialnr *serialnr)
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{
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char serial[17];
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if (env_get("serial#"))
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return;
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sprintf(serial, "%08x%08x", serialnr->high, serialnr->low);
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env_set("serial#", serial);
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}
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/*
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* The downstream/vendor kernel (provided by Samsung) uses ATAGS for booting.
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* It also requires an extremely long cmdline provided by the primary bootloader
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* that is not suitable for booting mainline.
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*
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* Since downstream is the only user of ATAGS, we emulate the behavior of the
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* Samsung bootloader by generating only the initrd atag in U-Boot, and copying
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* all other ATAGS as-is from the primary bootloader.
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*/
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static inline bool skip_atag(u32 tag)
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{
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return (tag == ATAG_NONE || tag == ATAG_CORE ||
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tag == ATAG_INITRD || tag == ATAG_INITRD2);
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}
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static void copy_atags(const struct tag *tags)
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{
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const struct tag *t;
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struct tag *copy;
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if (!tags)
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return;
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/* Calculate necessary size for tags we want to copy */
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for_each_tag(t, tags) {
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if (skip_atag(t->hdr.tag))
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continue;
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if (t->hdr.tag == ATAG_SERIAL)
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parse_serial(&t->u.serialnr);
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fw_atags_size += t->hdr.size * sizeof(u32);
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}
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if (!fw_atags_size)
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return; /* No tags to copy */
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copy = malloc(fw_atags_size);
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if (!copy)
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return;
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fw_atags_copy = copy;
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/* Copy tags */
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for_each_tag(t, tags) {
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if (skip_atag(t->hdr.tag))
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continue;
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memcpy(copy, t, t->hdr.size * sizeof(u32));
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copy = tag_next(copy);
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}
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}
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int misc_init_r(void)
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{
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copy_atags(fw_atags_get());
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return 0;
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}
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void setup_board_tags(struct tag **in_params)
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{
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if (!fw_atags_copy)
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return;
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/*
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* fw_atags_copy contains only full "struct tag" (plus data)
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* so copying it bytewise here should be fine.
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*/
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memcpy(*in_params, fw_atags_copy, fw_atags_size);
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*(u8 **)in_params += fw_atags_size;
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}
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