1 // SPDX-License-Identifier: GPL-2.0+
4 * Marvell Semiconductor <www.marvell.com>
5 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>,
6 * Contributor: Mahavir Jain <mjain@marvell.com>
11 #include <asm/arch/armada100.h>
13 DECLARE_GLOBAL_DATA_PTR;
16 * ARMADA100 DRAM controller supports upto 8 banks
17 * for chip select 0 and 1
21 * DDR Memory Control Registers
22 * Refer Datasheet Appendix A.17
24 struct armd1ddr_map_registers {
25 u32 cs; /* Memory Address Map Register -CS */
29 struct armd1ddr_registers {
30 u8 pad[0x100 - 0x000];
31 struct armd1ddr_map_registers mmap[2];
35 * armd1_sdram_base - reads SDRAM Base Address Register
37 u32 armd1_sdram_base(int chip_sel)
39 struct armd1ddr_registers *ddr_regs =
40 (struct armd1ddr_registers *)ARMD1_DRAM_BASE;
42 u32 CS_valid = 0x01 & readl(&ddr_regs->mmap[chip_sel].cs);
47 result = readl(&ddr_regs->mmap[chip_sel].cs) & 0xFF800000;
52 * armd1_sdram_size - reads SDRAM size
54 u32 armd1_sdram_size(int chip_sel)
56 struct armd1ddr_registers *ddr_regs =
57 (struct armd1ddr_registers *)ARMD1_DRAM_BASE;
59 u32 CS_valid = 0x01 & readl(&ddr_regs->mmap[chip_sel].cs);
64 result = readl(&ddr_regs->mmap[chip_sel].cs);
65 result = (result >> 16) & 0xF;
67 printf("Unknown DRAM Size\n");
70 return ((0x8 << (result - 0x7)) * 1024 * 1024);
79 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
80 gd->bd->bi_dram[i].start = armd1_sdram_base(i);
81 gd->bd->bi_dram[i].size = armd1_sdram_size(i);
83 * It is assumed that all memory banks are consecutive
85 * If the gap is found, ram_size will be reported for
86 * consecutive memory only
88 if (gd->bd->bi_dram[i].start != gd->ram_size)
91 gd->ram_size += gd->bd->bi_dram[i].size;
95 for (; i < CONFIG_NR_DRAM_BANKS; i++) {
96 /* If above loop terminated prematurely, we need to set
97 * remaining banks' start address & size as 0. Otherwise other
98 * u-boot functions and Linux kernel gets wrong values which
99 * could result in crash */
100 gd->bd->bi_dram[i].start = 0;
101 gd->bd->bi_dram[i].size = 0;
107 * If this function is not defined here,
108 * board.c alters dram bank zero configuration defined above.
110 int dram_init_banksize(void)