board/seeed/npi_imx6ull/spl.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2021 Linumiz
 * Author: Navin Sankar Velliangiri <navin@linumiz.com>
 */

#include <common.h>
#include <init.h>
#include <spl.h>
#include <asm/arch/clock.h>
#include <asm/io.h>
#include <asm/arch/mx6-ddr.h>
#include <asm/arch/mx6-pins.h>
#include <asm/arch/crm_regs.h>
#include <asm/arch/sys_proto.h>
#include <fsl_esdhc_imx.h>

/* Configuration for Micron MT41K256M16TW-107 32M x 16 x 8 -> 512MiB */

static struct mx6ul_iomux_grp_regs mx6_grp_ioregs = {
	.grp_addds = 0x00000030,
	.grp_ddrmode_ctl = 0x00020000,
	.grp_b0ds = 0x00000030,
	.grp_ctlds = 0x00000030,
	.grp_b1ds = 0x00000030,
	.grp_ddrpke = 0x00000000,
	.grp_ddrmode = 0x00020000,
	.grp_ddr_type = 0x000c0000,
};

static struct mx6ul_iomux_ddr_regs mx6_ddr_ioregs = {
	.dram_dqm0 = 0x00000030,
	.dram_dqm1 = 0x00000030,
	.dram_ras = 0x00000030,
	.dram_cas = 0x00000030,
	.dram_odt0 = 0x00000030,
	.dram_odt1 = 0x00000030,
	.dram_sdba2 = 0x00000000,
	.dram_sdclk_0 = 0x00000030,
	.dram_sdqs0 = 0x00000030,
	.dram_sdqs1 = 0x00000030,
	.dram_reset = 0x00000030,
};

static struct mx6_mmdc_calibration mx6_mmcd_calib = {
	.p0_mpwldectrl0 = 0x00000000,
	.p0_mpdgctrl0 = 0x41480148,
	.p0_mprddlctl = 0x40403E42,
	.p0_mpwrdlctl = 0x40405852,
};

struct mx6_ddr_sysinfo ddr_sysinfo = {
	.dsize = 0,             /* Bus size = 16bit */
	.cs_density = 32,
	.ncs = 1,
	.cs1_mirror = 0,
	.rtt_wr = 1,
	.rtt_nom = 1,
	.walat = 1,             /* Write additional latency */
	.ralat = 5,             /* Read additional latency */
	.mif3_mode = 3,         /* Command prediction working mode */
	.bi_on = 1,             /* Bank interleaving enabled */
	.pd_fast_exit = 1,
	.sde_to_rst = 0x10,
	.rst_to_cke = 0x23,     /* 33 cycles, 500us (JEDEC default) */
	.ddr_type = DDR_TYPE_DDR3,
	.refsel = 1,            /* Refresh cycles at 32KHz */
	.refr = 7,              /* 8 refresh commands per refresh cycle */
};

static struct mx6_ddr3_cfg mem_ddr = {
	.mem_speed = 1600,
	.density = 4,
	.width = 16,
	.banks = 8,
	.rowaddr = 15,
	.coladdr = 10,
	.pagesz = 2,
	.trcd = 1375,
	.trcmin = 4875,
	.trasmin = 3500,
};

static void ccgr_init(void)
{
	struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;

	writel(0xFFFFFFFF, &ccm->CCGR0);
	writel(0xFFFFFFFF, &ccm->CCGR1);
	writel(0xFFFFFFFF, &ccm->CCGR2);
	writel(0xFFFFFFFF, &ccm->CCGR3);
	writel(0xFFFFFFFF, &ccm->CCGR4);
	writel(0xFFFFFFFF, &ccm->CCGR5);
	writel(0xFFFFFFFF, &ccm->CCGR6);
}

static void spl_dram_init(void)
{
	mx6ul_dram_iocfg(mem_ddr.width, &mx6_ddr_ioregs, &mx6_grp_ioregs);
	mx6_dram_cfg(&ddr_sysinfo, &mx6_mmcd_calib, &mem_ddr);
}

#ifdef CONFIG_FSL_ESDHC_IMX

#define USDHC_PAD_CTRL (PAD_CTL_PKE         | PAD_CTL_PUE       | \
			PAD_CTL_PUS_22K_UP  | PAD_CTL_SPEED_LOW | \
			PAD_CTL_DSE_80ohm   | PAD_CTL_SRE_FAST  | \
			PAD_CTL_HYS)

static iomux_v3_cfg_t const usdhc1_pads[] = {
	MX6_PAD_SD1_CLK__USDHC1_CLK | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_SD1_CMD__USDHC1_CMD | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_SD1_DATA0__USDHC1_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_SD1_DATA1__USDHC1_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_SD1_DATA2__USDHC1_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_SD1_DATA3__USDHC1_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_UART1_RTS_B__USDHC1_CD_B | MUX_PAD_CTRL(USDHC_PAD_CTRL),
};

#ifndef CONFIG_NAND_MXS
static iomux_v3_cfg_t const usdhc2_pads[] = {
	MX6_PAD_NAND_RE_B__USDHC2_CLK    | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_WE_B__USDHC2_CMD    | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA00__USDHC2_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA01__USDHC2_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA02__USDHC2_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA03__USDHC2_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA04__USDHC2_DATA4 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA05__USDHC2_DATA5 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA06__USDHC2_DATA6 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
	MX6_PAD_NAND_DATA07__USDHC2_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
};
#endif

static struct fsl_esdhc_cfg usdhc_cfg[] = {
	{
		.esdhc_base = USDHC1_BASE_ADDR,
		.max_bus_width = 4,
	},
#ifndef CONFIG_NAND_MXS
	{
		.esdhc_base = USDHC2_BASE_ADDR,
		.max_bus_width = 8,
	},
#endif
};

int board_mmc_getcd(struct mmc *mmc)
{
	return 1;
}

int board_mmc_init(struct bd_info *bis)
{
	int i, ret;

	for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
		switch (i) {
		case 0:
			SETUP_IOMUX_PADS(usdhc1_pads);
			usdhc_cfg[i].sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
			break;
#ifndef CONFIG_NAND_MXS
		case 1:
			SETUP_IOMUX_PADS(usdhc2_pads);
			usdhc_cfg[i].sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
			break;
#endif
		default:
			printf("Warning - USDHC%d controller not supporting\n",
			       i + 1);
			return 0;
		}

		ret = fsl_esdhc_initialize(bis, &usdhc_cfg[i]);
		if (ret) {
			printf("Warning: failed to initialize mmc dev %d\n", i);
			return ret;
		}
	}

	return 0;
}

#endif /* CONFIG_FSL_ESDHC_IMX */

void board_init_f(ulong dummy)
{
	ccgr_init();

	/* Setup AIPS and disable watchdog */
	arch_cpu_init();

	/* Setup iomux and fec */
	board_early_init_f();

	/* Setup GP timer */
	timer_init();

	/* UART clocks enabled and gd valid - init serial console */
	preloader_console_init();

	/* DDR initialization */
	spl_dram_init();
}