mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2010
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* Marvell Semiconductor <www.marvell.com>
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* Written-by: Prafulla Wadaskar <prafulla@marvell.com>,
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* Contributor: Mahavir Jain <mjain@marvell.com>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/armada100.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* ARMADA100 DRAM controller supports upto 8 banks
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* for chip select 0 and 1
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*/
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/*
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* DDR Memory Control Registers
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* Refer Datasheet Appendix A.17
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*/
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struct armd1ddr_map_registers {
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u32 cs; /* Memory Address Map Register -CS */
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u32 pad[3];
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};
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struct armd1ddr_registers {
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u8 pad[0x100 - 0x000];
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struct armd1ddr_map_registers mmap[2];
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};
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/*
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* armd1_sdram_base - reads SDRAM Base Address Register
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*/
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u32 armd1_sdram_base(int chip_sel)
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{
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struct armd1ddr_registers *ddr_regs =
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(struct armd1ddr_registers *)ARMD1_DRAM_BASE;
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u32 result = 0;
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u32 CS_valid = 0x01 & readl(&ddr_regs->mmap[chip_sel].cs);
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if (!CS_valid)
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return 0;
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result = readl(&ddr_regs->mmap[chip_sel].cs) & 0xFF800000;
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return result;
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}
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/*
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* armd1_sdram_size - reads SDRAM size
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*/
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u32 armd1_sdram_size(int chip_sel)
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{
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struct armd1ddr_registers *ddr_regs =
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(struct armd1ddr_registers *)ARMD1_DRAM_BASE;
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u32 result = 0;
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u32 CS_valid = 0x01 & readl(&ddr_regs->mmap[chip_sel].cs);
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if (!CS_valid)
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return 0;
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result = readl(&ddr_regs->mmap[chip_sel].cs);
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result = (result >> 16) & 0xF;
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if (result < 0x7) {
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printf("Unknown DRAM Size\n");
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return -1;
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} else {
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return ((0x8 << (result - 0x7)) * 1024 * 1024);
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}
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}
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int dram_init(void)
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{
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int i;
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gd->ram_size = 0;
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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gd->bd->bi_dram[i].start = armd1_sdram_base(i);
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gd->bd->bi_dram[i].size = armd1_sdram_size(i);
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/*
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* It is assumed that all memory banks are consecutive
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* and without gaps.
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* If the gap is found, ram_size will be reported for
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* consecutive memory only
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*/
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if (gd->bd->bi_dram[i].start != gd->ram_size)
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break;
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gd->ram_size += gd->bd->bi_dram[i].size;
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}
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for (; i < CONFIG_NR_DRAM_BANKS; i++) {
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/* If above loop terminated prematurely, we need to set
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* remaining banks' start address & size as 0. Otherwise other
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* u-boot functions and Linux kernel gets wrong values which
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* could result in crash */
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gd->bd->bi_dram[i].start = 0;
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gd->bd->bi_dram[i].size = 0;
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}
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return 0;
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}
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/*
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* If this function is not defined here,
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* board.c alters dram bank zero configuration defined above.
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*/
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int dram_init_banksize(void)
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{
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dram_init();
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return 0;
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}
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