drivers/ddr/fsl/mpc85xx_ddr_gen1.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2008 Freescale Semiconductor, Inc.
 */

#include <config.h>
#include <log.h>
#include <asm/io.h>
#include <fsl_ddr_sdram.h>
#include <linux/delay.h>

#if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
#error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
#endif

void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
			     unsigned int ctrl_num, int step)
{
	unsigned int i;
	struct ccsr_ddr __iomem *ddr =
		(struct ccsr_ddr __iomem *)CFG_SYS_FSL_DDR_ADDR;

	if (ctrl_num != 0) {
		printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
		return;
	}

	for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
		if (i == 0) {
			out_be32(&ddr->cs0_bnds, regs->cs[i].bnds);
			out_be32(&ddr->cs0_config, regs->cs[i].config);

		} else if (i == 1) {
			out_be32(&ddr->cs1_bnds, regs->cs[i].bnds);
			out_be32(&ddr->cs1_config, regs->cs[i].config);

		} else if (i == 2) {
			out_be32(&ddr->cs2_bnds, regs->cs[i].bnds);
			out_be32(&ddr->cs2_config, regs->cs[i].config);

		} else if (i == 3) {
			out_be32(&ddr->cs3_bnds, regs->cs[i].bnds);
			out_be32(&ddr->cs3_config, regs->cs[i].config);
		}
	}

	out_be32(&ddr->timing_cfg_1, regs->timing_cfg_1);
	out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
	out_be32(&ddr->sdram_mode, regs->ddr_sdram_mode);
	out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);

	/*
	 * 200 painful micro-seconds must elapse between
	 * the DDR clock setup and the DDR config enable.
	 */
	udelay(200);
	asm volatile("sync;isync");

	out_be32(&ddr->sdram_cfg, regs->ddr_sdram_cfg);

	asm("sync;isync;msync");
	udelay(500);
}

#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
/*
 * Initialize all of memory for ECC, then enable errors.
 */

void
ddr_enable_ecc(unsigned int dram_size)
{
	struct ccsr_ddr __iomem *ddr =
		(struct ccsr_ddr __iomem *)(CFG_SYS_FSL_DDR_ADDR);

	dma_meminit(dram_size);

	/*
	 * Enable errors for ECC.
	 */
	debug("DMA DDR: err_disable = 0x%08x\n", ddr->err_disable);
	ddr->err_disable = 0x00000000;
	asm("sync;isync;msync");
	debug("DMA DDR: err_disable = 0x%08x\n", ddr->err_disable);
}

#endif	/* CONFIG_DDR_ECC  && ! CONFIG_ECC_INIT_VIA_DDRCONTROLLER */