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aa6e94deab
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS_SDRAM namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#include <common.h>
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#include <init.h>
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#include <asm/global_data.h>
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#include <asm/immap.h>
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DECLARE_GLOBAL_DATA_PTR;
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int checkboard (void)
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{
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puts ("Board: Freescale M5282EVB Evaluation Board\n");
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return 0;
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}
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int dram_init(void)
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{
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u32 dramsize, i, dramclk;
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dramsize = CFG_SYS_SDRAM_SIZE * 0x100000;
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for (i = 0x13; i < 0x20; i++) {
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if (dramsize == (1 << i))
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break;
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}
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i--;
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if (!(MCFSDRAMC_DACR0 & MCFSDRAMC_DACR_RE))
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{
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dramclk = gd->bus_clk / (CONFIG_SYS_HZ * CONFIG_SYS_HZ);
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/* Initialize DRAM Control Register: DCR */
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MCFSDRAMC_DCR = (0
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| MCFSDRAMC_DCR_RTIM_6
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| MCFSDRAMC_DCR_RC((15 * dramclk)>>4));
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asm("nop");
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/* Initialize DACR0 */
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MCFSDRAMC_DACR0 = (0
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| MCFSDRAMC_DACR_BASE(CFG_SYS_SDRAM_BASE)
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| MCFSDRAMC_DACR_CASL(1)
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| MCFSDRAMC_DACR_CBM(3)
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| MCFSDRAMC_DACR_PS_32);
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asm("nop");
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/* Initialize DMR0 */
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MCFSDRAMC_DMR0 = (0
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| ((dramsize - 1) & 0xFFFC0000)
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| MCFSDRAMC_DMR_V);
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asm("nop");
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/* Set IP (bit 3) in DACR */
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MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IP;
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asm("nop");
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/* Wait 30ns to allow banks to precharge */
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for (i = 0; i < 5; i++) {
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asm ("nop");
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}
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/* Write to this block to initiate precharge */
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*(u32 *)(CFG_SYS_SDRAM_BASE) = 0xA5A59696;
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asm("nop");
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/* Set RE (bit 15) in DACR */
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MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_RE;
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asm("nop");
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/* Wait for at least 8 auto refresh cycles to occur */
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for (i = 0; i < 2000; i++) {
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asm(" nop");
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}
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/* Finish the configuration by issuing the IMRS. */
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MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IMRS;
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asm("nop");
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/* Write to the SDRAM Mode Register */
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*(u32 *)(CFG_SYS_SDRAM_BASE + 0x400) = 0xA5A59696;
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}
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gd->ram_size = dramsize;
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return 0;
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}
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