mirror of
https://github.com/AsahiLinux/u-boot
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84 lines
2 KiB
C
84 lines
2 KiB
C
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/*
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* Copyright (C) 2017 Rockchip Electronics Co., Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <ram.h>
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#include <asm/io.h>
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#include <asm/arch/sdram_common.h>
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#include <dm/uclass-internal.h>
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DECLARE_GLOBAL_DATA_PTR;
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size_t rockchip_sdram_size(phys_addr_t reg)
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{
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u32 rank, col, bk, cs0_row, cs1_row, bw, row_3_4;
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size_t chipsize_mb = 0;
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size_t size_mb = 0;
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u32 ch;
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u32 sys_reg = readl(reg);
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u32 ch_num = 1 + ((sys_reg >> SYS_REG_NUM_CH_SHIFT)
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& SYS_REG_NUM_CH_MASK);
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debug("%s %x %x\n", __func__, (u32)reg, sys_reg);
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for (ch = 0; ch < ch_num; ch++) {
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rank = 1 + (sys_reg >> SYS_REG_RANK_SHIFT(ch) &
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SYS_REG_RANK_MASK);
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col = 9 + (sys_reg >> SYS_REG_COL_SHIFT(ch) & SYS_REG_COL_MASK);
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bk = 3 - ((sys_reg >> SYS_REG_BK_SHIFT(ch)) & SYS_REG_BK_MASK);
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cs0_row = 13 + (sys_reg >> SYS_REG_CS0_ROW_SHIFT(ch) &
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SYS_REG_CS0_ROW_MASK);
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cs1_row = 13 + (sys_reg >> SYS_REG_CS1_ROW_SHIFT(ch) &
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SYS_REG_CS1_ROW_MASK);
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bw = (2 >> ((sys_reg >> SYS_REG_BW_SHIFT(ch)) &
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SYS_REG_BW_MASK));
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row_3_4 = sys_reg >> SYS_REG_ROW_3_4_SHIFT(ch) &
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SYS_REG_ROW_3_4_MASK;
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chipsize_mb = (1 << (cs0_row + col + bk + bw - 20));
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if (rank > 1)
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chipsize_mb += chipsize_mb >> (cs0_row - cs1_row);
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if (row_3_4)
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chipsize_mb = chipsize_mb * 3 / 4;
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size_mb += chipsize_mb;
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debug("rank %d col %d bk %d cs0_row %d bw %d row_3_4 %d\n",
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rank, col, bk, cs0_row, bw, row_3_4);
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}
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return (size_t)size_mb << 20;
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}
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int dram_init(void)
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{
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struct ram_info ram;
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struct udevice *dev;
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int ret;
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ret = uclass_get_device(UCLASS_RAM, 0, &dev);
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if (ret) {
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debug("DRAM init failed: %d\n", ret);
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return ret;
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}
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ret = ram_get_info(dev, &ram);
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if (ret) {
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debug("Cannot get DRAM size: %d\n", ret);
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return ret;
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}
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gd->ram_size = ram.size;
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debug("SDRAM base=%lx, size=%lx\n",
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(unsigned long)ram.base, (unsigned long)ram.size);
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return 0;
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}
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ulong board_get_usable_ram_top(ulong total_size)
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{
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unsigned long top = CONFIG_SYS_SDRAM_BASE + SDRAM_MAX_SIZE;
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return (gd->ram_top > top) ? top : gd->ram_top;
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}
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