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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 CS Group
* Charles Frey <charles.frey@c-s.fr>
*/
#include <linux/sizes.h>
#include <linux/delay.h>
#include <init.h>
#include <asm/io.h>
#include <mpc8xx.h>
#include <watchdog.h>
#include <asm/ppc.h>
#include <asm/immap_8xx.h>
DECLARE_GLOBAL_DATA_PTR;
#define ADDR_CPLD_R_TYPE ((unsigned char __iomem *)CONFIG_CPLD_BASE + 3)
#define _NOT_USED_ 0xFFFFEC04
static const uint sdram_table[] = {
/* DRAM - single read. (offset 0 in upm RAM) */
0x0F0CEC04, 0x0FFFEC04, 0x00AF2C04, 0x0FFFEC00,
0x0FFCE004, 0xFFFFEC05, _NOT_USED_, _NOT_USED_,
/* DRAM - burst read. (offset 8 in upm RAM) */
0x0F0CEC04, 0x0FFFEC04, 0x00AF2C04, 0x00FFEC00,
0x00FFEC00, 0x00FFEC00, 0x0FFCE000, 0x1FFFEC05,
/* DRAM - Precharge all banks. (offset 16 in upm RAM) */
_NOT_USED_, 0x0FFCE004, 0x1FFFEC05, _NOT_USED_,
/* DRAM - NOP. (offset 20 in upm RAM) */
0x1FFFEC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,
/* DRAM - single write. (offset 24 in upm RAM) */
0x0F0CEC04, 0x0FFFEC00, 0x00AF2004, 0x0FFFEC04,
0x0FFCE004, 0x0FFFEC04, 0xFFFFEC05, _NOT_USED_,
/* DRAM - burst write. (offset 32 in upm RAM) */
0x0F0CEC04, 0x0FFFEC00, 0x00AF2000, 0x00FFEC00,
0x00FFEC00, 0x00FFEC04, 0x0FFFEC04, 0x0FFCE004,
0x1FFFEC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
/* refresh (offset 48 in upm RAM) */
0x0FFDE404, 0x0FFEAC04, 0x0FFD6C84, 0x0FFFEC04,
0x0FFFEC04, 0x0FFFEC04, 0x0FFFEC04, 0x1FFFEC85,
/* init (offset 56 in upm RAM) */
0x0FEEA874, 0x0FBD6474, 0x1FFFEC45, _NOT_USED_,
/* exception. (offset 60 in upm RAM) */
0x0FFCE004, 0xFFFFEC05, _NOT_USED_, _NOT_USED_
};
/* SDRAM initialization */
int dram_init(void)
{
immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR;
memctl8xx_t __iomem *memctl = &immap->im_memctl;
u32 max_size, mamr;
u8 val;
printf("UPMA init for SDRAM (CAS latency 2), ");
printf("init address 0x%08x, size ", (int)dram_init);
/* Verify the SDRAM size of the board */
val = (in_8(ADDR_CPLD_R_TYPE) & 0x30) >> 4;
if (val == 0x03 || val == 0x00) {
max_size = 64 * SZ_1M; /* 64 Mo of SDRAM */
mamr = 0x20104000;
} else {
max_size = 128 * SZ_1M; /* 128 Mo of SDRAM */
mamr = 0x20206000;
}
/* Configure CS1 */
out_be32(&memctl->memc_or1,
~(max_size - 1) | OR_CSNT_SAM | OR_ACS_DIV2);
out_be32(&memctl->memc_br1, CFG_SYS_SDRAM_BASE | BR_MS_UPMA | BR_V);
/* Configure UPMA for CS1 */
upmconfig(UPMA, (uint *)sdram_table, ARRAY_SIZE(sdram_table));
out_be16(&memctl->memc_mptpr, MPTPR_PTP_DIV32);
/* disable refresh */
out_be32(&memctl->memc_mamr, mamr);
udelay(100);
/* NOP to maintain DQM high */
out_be32(&memctl->memc_mcr, 0x80002114);
udelay(200);
out_be32(&memctl->memc_mcr, 0x80002111); /* PRECHARGE cmd */
out_be32(&memctl->memc_mcr, 0x80002830); /* AUTO REFRESH cmd */
out_be32(&memctl->memc_mar, 0x00000088);
out_be32(&memctl->memc_mcr, 0x80002138);
/* Enable refresh */
setbits_be32(&memctl->memc_mamr, MAMR_PTAE);
gd->ram_size = get_ram_size((long *)CFG_SYS_SDRAM_BASE, max_size);
return 0;
}
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