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);
80 for (i
= 0; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
81 gd
->bd
->bi_dram
[i
].start
= armd1_sdram_base(i
);
82 gd
->bd
->bi_dram
[i
].size
= armd1_sdram_size(i
);
84 * It is assumed that all memory banks are consecutive
86 * If the gap is found, ram_size will be reported for
87 * consecutive memory only
89 if (gd
->bd
->bi_dram
[i
].start
!= gd
->ram_size
)
92 gd
->ram_size
+= gd
->bd
->bi_dram
[i
].size
;
96 for (; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
97 /* If above loop terminated prematurely, we need to set
98 * remaining banks' start address & size as 0. Otherwise other
99 * u-boot functions and Linux kernel gets wrong values which
100 * could result in crash */
101 gd
->bd
->bi_dram
[i
].start
= 0;
102 gd
->bd
->bi_dram
[i
].size
= 0;
108 * If this function is not defined here,
109 * board.c alters dram bank zero configuration defined above.
111 int dram_init_banksize(void)