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