mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 00:47:26 +00:00
c05ed00afb
Move this uncommon header out of the common header. Signed-off-by: Simon Glass <sjg@chromium.org>
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* LPC32xx dram init
|
|
*
|
|
* (C) Copyright 2014 DENX Software Engineering GmbH
|
|
* Written-by: Albert ARIBAUD <albert.aribaud@3adev.fr>
|
|
*
|
|
* This is called by SPL to gain access to the SDR DRAM.
|
|
*
|
|
* This code runs from SRAM.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <netdev.h>
|
|
#include <asm/arch/cpu.h>
|
|
#include <asm/arch/clk.h>
|
|
#include <asm/arch/wdt.h>
|
|
#include <asm/arch/emc.h>
|
|
#include <asm/io.h>
|
|
#include <linux/delay.h>
|
|
|
|
static struct clk_pm_regs *clk = (struct clk_pm_regs *)CLK_PM_BASE;
|
|
static struct emc_regs *emc = (struct emc_regs *)EMC_BASE;
|
|
|
|
void ddr_init(struct emc_dram_settings *dram)
|
|
{
|
|
uint32_t ck;
|
|
|
|
/* Enable EMC interface and choose little endian mode */
|
|
writel(1, &emc->ctrl);
|
|
writel(0, &emc->config);
|
|
/* Select maximum EMC Dynamic Memory Refresh Time */
|
|
writel(0x7FF, &emc->refresh);
|
|
/* Determine CLK */
|
|
ck = get_sdram_clk_rate();
|
|
/* Configure SDRAM */
|
|
writel(dram->cmddelay, &clk->sdramclk_ctrl);
|
|
writel(dram->config0, &emc->config0);
|
|
writel(dram->rascas0, &emc->rascas0);
|
|
writel(dram->rdconfig, &emc->read_config);
|
|
/* Set timings */
|
|
writel((ck / dram->trp) & 0x0000000F, &emc->t_rp);
|
|
writel((ck / dram->tras) & 0x0000000F, &emc->t_ras);
|
|
writel((ck / dram->tsrex) & 0x0000007F, &emc->t_srex);
|
|
writel((ck / dram->twr) & 0x0000000F, &emc->t_wr);
|
|
writel((ck / dram->trc) & 0x0000001F, &emc->t_rc);
|
|
writel((ck / dram->trfc) & 0x0000001F, &emc->t_rfc);
|
|
writel((ck / dram->txsr) & 0x000000FF, &emc->t_xsr);
|
|
writel(dram->trrd, &emc->t_rrd);
|
|
writel(dram->tmrd, &emc->t_mrd);
|
|
writel(dram->tcdlr, &emc->t_cdlr);
|
|
/* Dynamic refresh */
|
|
writel((((ck / dram->refresh) >> 4) & 0x7FF), &emc->refresh);
|
|
udelay(10);
|
|
/* Force all clocks, enable inverted ck, issue NOP command */
|
|
writel(0x00000193, &emc->control);
|
|
udelay(100);
|
|
/* Keep all clocks enabled, issue a PRECHARGE ALL command */
|
|
writel(0x00000113, &emc->control);
|
|
/* Fast dynamic refresh for at least a few SDRAM ck cycles */
|
|
writel((((128) >> 4) & 0x7FF), &emc->refresh);
|
|
udelay(10);
|
|
/* set correct dynamic refresh timing */
|
|
writel((((ck / dram->refresh) >> 4) & 0x7FF), &emc->refresh);
|
|
udelay(10);
|
|
/* set normal mode to CAS=3 */
|
|
writel(0x00000093, &emc->control);
|
|
readl(EMC_DYCS0_BASE | dram->mode);
|
|
/* set extended mode to all zeroes */
|
|
writel(0x00000093, &emc->control);
|
|
readl(EMC_DYCS0_BASE | dram->emode);
|
|
/* stop forcing clocks, keep inverted clock, issue normal mode */
|
|
writel(0x00000010, &emc->control);
|
|
}
|