3 * Marvell Semiconductor <www.marvell.com>
4 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>,
5 * Contributor: Mahavir Jain <mjain@marvell.com>
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/arch/armada100.h>
14 DECLARE_GLOBAL_DATA_PTR;
17 * ARMADA100 DRAM controller supports upto 8 banks
18 * for chip select 0 and 1
22 * DDR Memory Control Registers
23 * Refer Datasheet Appendix A.17
25 struct armd1ddr_map_registers {
26 u32 cs; /* Memory Address Map Register -CS */
30 struct armd1ddr_registers {
31 u8 pad[0x100 - 0x000];
32 struct armd1ddr_map_registers mmap[2];
36 * armd1_sdram_base - reads SDRAM Base Address Register
38 u32 armd1_sdram_base(int chip_sel)
40 struct armd1ddr_registers *ddr_regs =
41 (struct armd1ddr_registers *)ARMD1_DRAM_BASE;
43 u32 CS_valid = 0x01 & readl(&ddr_regs->mmap[chip_sel].cs);
48 result = readl(&ddr_regs->mmap[chip_sel].cs) & 0xFF800000;
53 * armd1_sdram_size - reads SDRAM size
55 u32 armd1_sdram_size(int chip_sel)
57 struct armd1ddr_registers *ddr_regs =
58 (struct armd1ddr_registers *)ARMD1_DRAM_BASE;
60 u32 CS_valid = 0x01 & readl(&ddr_regs->mmap[chip_sel].cs);
65 result = readl(&ddr_regs->mmap[chip_sel].cs);
66 result = (result >> 16) & 0xF;
68 printf("Unknown DRAM Size\n");
71 return ((0x8 << (result - 0x7)) * 1024 * 1024);
75 #ifndef CONFIG_SYS_BOARD_DRAM_INIT
81 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
82 gd->bd->bi_dram[i].start = armd1_sdram_base(i);
83 gd->bd->bi_dram[i].size = armd1_sdram_size(i);
85 * It is assumed that all memory banks are consecutive
87 * If the gap is found, ram_size will be reported for
88 * consecutive memory only
90 if (gd->bd->bi_dram[i].start != gd->ram_size)
93 gd->ram_size += gd->bd->bi_dram[i].size;
97 for (; i < CONFIG_NR_DRAM_BANKS; i++) {
98 /* If above loop terminated prematurely, we need to set
99 * remaining banks' start address & size as 0. Otherwise other
100 * u-boot functions and Linux kernel gets wrong values which
101 * could result in crash */
102 gd->bd->bi_dram[i].start = 0;
103 gd->bd->bi_dram[i].size = 0;
109 * If this function is not defined here,
110 * board.c alters dram bank zero configuration defined above.
112 void dram_init_banksize(void)
116 #endif /* CONFIG_SYS_BOARD_DRAM_INIT */