board/k+p/kp_imx6q_tpc/kp_imx6q_tpc_spl.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * K+P iMX6Q KP_IMX6Q_TPC board configuration
 *
 * Copyright (C) 2018 Lukasz Majewski <lukma@denx.de>
 */

#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/crm_regs.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/iomux.h>
#include <asm/arch/mx6-ddr.h>
#include <asm/arch/mx6-pins.h>
#include <asm/arch/sys_proto.h>
#include <asm/gpio.h>
#include <asm/mach-imx/boot_mode.h>
#include <asm/mach-imx/iomux-v3.h>
#include <asm/mach-imx/mxc_i2c.h>
#include <asm/io.h>
#include <errno.h>
#include <fuse.h>
#include <fsl_esdhc.h>
#include <i2c.h>
#include <mmc.h>
#include <spl.h>

#define UART_PAD_CTRL							\
	(PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED | PAD_CTL_DSE_40ohm |	\
	 PAD_CTL_SRE_FAST  | PAD_CTL_HYS)

#define USDHC_PAD_CTRL							\
	(PAD_CTL_PUS_47K_UP | PAD_CTL_SPEED_LOW | PAD_CTL_DSE_80ohm |	\
	 PAD_CTL_SRE_FAST | PAD_CTL_HYS)

DECLARE_GLOBAL_DATA_PTR;

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

	writel(0x00C03F3F, &ccm->CCGR0);
	writel(0x0030FC03, &ccm->CCGR1);
	writel(0x0FFFC000, &ccm->CCGR2);
	writel(0x3FF00000, &ccm->CCGR3);
	writel(0x00FFF300, &ccm->CCGR4);
	writel(0x0F0000C3, &ccm->CCGR5);
	writel(0x000003FF, &ccm->CCGR6);
}

/* onboard microSD */
static iomux_v3_cfg_t const usdhc2_pads[] = {
	IOMUX_PADS(PAD_SD2_DAT0__SD2_DATA0	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD2_DAT1__SD2_DATA1	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD2_DAT2__SD2_DATA2	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD2_DAT3__SD2_DATA3	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD2_CLK__SD2_CLK	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD2_CMD__SD2_CMD	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_NANDF_CS3__GPIO6_IO16	| MUX_PAD_CTRL(NO_PAD_CTRL)),
};

/* eMMC */
static iomux_v3_cfg_t const usdhc4_pads[] = {
	IOMUX_PADS(PAD_SD4_DAT0__SD4_DATA0	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT1__SD4_DATA1	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT2__SD4_DATA2	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT3__SD4_DATA3	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT4__SD4_DATA4	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT5__SD4_DATA5	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT6__SD4_DATA6	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_DAT7__SD4_DATA7	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_CLK__SD4_CLK	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
	IOMUX_PADS(PAD_SD4_CMD__SD4_CMD	| MUX_PAD_CTRL(USDHC_PAD_CTRL)),
};

/* SD */
static void setup_iomux_sd(void)
{
	SETUP_IOMUX_PADS(usdhc2_pads);
	SETUP_IOMUX_PADS(usdhc4_pads);
}

/* UART */
static iomux_v3_cfg_t const uart1_pads[] = {
	IOMUX_PADS(PAD_SD3_DAT7__UART1_TX_DATA	| MUX_PAD_CTRL(UART_PAD_CTRL)),
	IOMUX_PADS(PAD_SD3_DAT6__UART1_RX_DATA	| MUX_PAD_CTRL(UART_PAD_CTRL)),
};

static void setup_iomux_uart(void)
{
	SETUP_IOMUX_PADS(uart1_pads);
}

/* USB */
static iomux_v3_cfg_t const usb_pads[] = {
	IOMUX_PADS(PAD_GPIO_1__USB_OTG_ID	| MUX_PAD_CTRL(NO_PAD_CTRL)),
	IOMUX_PADS(PAD_EIM_D31__GPIO3_IO31	| MUX_PAD_CTRL(NO_PAD_CTRL)),
};

static void setup_iomux_usb(void)
{
	SETUP_IOMUX_PADS(usb_pads);
}

/* DDR3 */
static const struct mx6dq_iomux_ddr_regs mx6_ddr_ioregs = {
	.dram_sdclk_0 = 0x00000030,
	.dram_sdclk_1 = 0x00000030,
	.dram_cas = 0x00000030,
	.dram_ras = 0x00000030,
	.dram_reset = 0x00000030,
	.dram_sdcke0 = 0x00003000,
	.dram_sdcke1 = 0x00003000,
	.dram_sdba2 = 0x00000000,
	.dram_sdodt0 = 0x00000030,
	.dram_sdodt1 = 0x00000030,

	.dram_sdqs0 = 0x00000018,
	.dram_sdqs1 = 0x00000018,
	.dram_sdqs2 = 0x00000018,
	.dram_sdqs3 = 0x00000018,
	.dram_sdqs4 = 0x00000018,
	.dram_sdqs5 = 0x00000018,
	.dram_sdqs6 = 0x00000018,
	.dram_sdqs7 = 0x00000018,

	.dram_dqm0 = 0x00000018,
	.dram_dqm1 = 0x00000018,
	.dram_dqm2 = 0x00000018,
	.dram_dqm3 = 0x00000018,
	.dram_dqm4 = 0x00000018,
	.dram_dqm5 = 0x00000018,
	.dram_dqm6 = 0x00000018,
	.dram_dqm7 = 0x00000018,
};

static const struct mx6dq_iomux_grp_regs mx6_grp_ioregs = {
	.grp_ddr_type = 0x000c0000,
	.grp_ddrmode_ctl = 0x00020000,
	.grp_ddrpke = 0x00000000,
	.grp_addds = 0x00000030,
	.grp_ctlds = 0x00000030,
	.grp_ddrmode = 0x00020000,
	.grp_b0ds = 0x00000018,
	.grp_b1ds = 0x00000018,
	.grp_b2ds = 0x00000018,
	.grp_b3ds = 0x00000018,
	.grp_b4ds = 0x00000018,
	.grp_b5ds = 0x00000018,
	.grp_b6ds = 0x00000018,
	.grp_b7ds = 0x00000018,
};

static const struct mx6_mmdc_calibration mx6_4x256mx16_mmdc_calib = {
	.p0_mpwldectrl0 = 0x001F001F,
	.p0_mpwldectrl1 = 0x001F001F,
	.p1_mpwldectrl0 = 0x001F001F,
	.p1_mpwldectrl1 = 0x001F001F,
	.p0_mpdgctrl0 = 0x43270338,
	.p0_mpdgctrl1 = 0x03200314,
	.p1_mpdgctrl0 = 0x431A032F,
	.p1_mpdgctrl1 = 0x03200263,
	.p0_mprddlctl = 0x4B434748,
	.p1_mprddlctl = 0x4445404C,
	.p0_mpwrdlctl = 0x38444542,
	.p1_mpwrdlctl = 0x4935493A,
};

/* MT41K256M16 (4Gb density) */
static const struct mx6_ddr3_cfg mt41k256m16 = {
	.mem_speed = 1600,
	.density = 4,
	.width = 16,
	.banks = 8,
	.rowaddr = 15,
	.coladdr = 10,
	.pagesz = 2,
	.trcd = 1375,
	.trcmin = 4875,
	.trasmin = 3500,
};

#ifdef CONFIG_MX6_DDRCAL
static void spl_dram_print_cal(struct mx6_ddr_sysinfo const *sysinfo)
{
	struct mx6_mmdc_calibration calibration = {0};

	mmdc_read_calibration(sysinfo, &calibration);

	debug(".p0_mpdgctrl0\t= 0x%08X\n", calibration.p0_mpdgctrl0);
	debug(".p0_mpdgctrl1\t= 0x%08X\n", calibration.p0_mpdgctrl1);
	debug(".p0_mprddlctl\t= 0x%08X\n", calibration.p0_mprddlctl);
	debug(".p0_mpwrdlctl\t= 0x%08X\n", calibration.p0_mpwrdlctl);
	debug(".p0_mpwldectrl0\t= 0x%08X\n", calibration.p0_mpwldectrl0);
	debug(".p0_mpwldectrl1\t= 0x%08X\n", calibration.p0_mpwldectrl1);
	debug(".p1_mpdgctrl0\t= 0x%08X\n", calibration.p1_mpdgctrl0);
	debug(".p1_mpdgctrl1\t= 0x%08X\n", calibration.p1_mpdgctrl1);
	debug(".p1_mprddlctl\t= 0x%08X\n", calibration.p1_mprddlctl);
	debug(".p1_mpwrdlctl\t= 0x%08X\n", calibration.p1_mpwrdlctl);
	debug(".p1_mpwldectrl0\t= 0x%08X\n", calibration.p1_mpwldectrl0);
	debug(".p1_mpwldectrl1\t= 0x%08X\n", calibration.p1_mpwldectrl1);
}

static void spl_dram_perform_cal(struct mx6_ddr_sysinfo const *sysinfo)
{
	int ret;

	/* Perform DDR DRAM calibration */
	udelay(100);
	ret = mmdc_do_write_level_calibration(sysinfo);
	if (ret) {
		printf("DDR: Write level calibration error [%d]\n", ret);
		return;
	}

	ret = mmdc_do_dqs_calibration(sysinfo);
	if (ret) {
		printf("DDR: DQS calibration error [%d]\n", ret);
		return;
	}

	spl_dram_print_cal(sysinfo);
}
#endif /* CONFIG_MX6_DDRCAL */

static void spl_dram_init(void)
{
	struct mx6_ddr_sysinfo sysinfo = {
		/* width of data bus:0=16,1=32,2=64 */
		.dsize = 2,
		/* config for full 4GB range so that get_mem_size() works */
		.cs_density = 32, /* 32Gb per CS */
		/* single chip select */
		.ncs = 1,
		.cs1_mirror = 0,
		.rtt_wr = 1 /*DDR3_RTT_60_OHM*/,	/* RTT_Wr = RZQ/4 */
		.rtt_nom = 2 /*DDR3_RTT_120_OHM*/,	/* RTT_Nom = RZQ/2 */
		.walat = 1,	/* Write additional latency */
		.ralat = 5,	/* Read additional latency */
		.mif3_mode = 3,	/* Command prediction working mode */
		.bi_on = 1,	/* Bank interleaving enabled */
		.sde_to_rst = 0x10,	/* 14 cycles, 200us (JEDEC default) */
		.rst_to_cke = 0x23,	/* 33 cycles, 500us (JEDEC default) */
		.pd_fast_exit = 1, /* enable precharge power-down fast exit */
		.ddr_type = DDR_TYPE_DDR3,
		.refsel = 1,	/* Refresh cycles at 32KHz */
		.refr = 7,	/* 8 refresh commands per refresh cycle */
	};

	mx6dq_dram_iocfg(64, &mx6_ddr_ioregs, &mx6_grp_ioregs);
	mx6_dram_cfg(&sysinfo, &mx6_4x256mx16_mmdc_calib, &mt41k256m16);

#ifdef CONFIG_MX6_DDRCAL
	spl_dram_perform_cal(&sysinfo);
#endif
}

struct fsl_esdhc_cfg usdhc_cfg[] = {
	{USDHC2_BASE_ADDR},
	{USDHC4_BASE_ADDR},
};

#define USDHC2_CD_GPIO	IMX_GPIO_NR(1, 4)
int board_mmc_getcd(struct mmc *mmc)
{
	struct fsl_esdhc_cfg *cfg = (struct fsl_esdhc_cfg *)mmc->priv;
	int ret = 0;

	switch (cfg->esdhc_base) {
	case USDHC2_BASE_ADDR:
		ret = !gpio_get_value(USDHC2_CD_GPIO);
		break;
	case USDHC4_BASE_ADDR:
		ret = 1; /* eMMC/uSDHC4 is always present */
		break;
	}

	return ret;
}

int board_mmc_init(bd_t *bd)
{
	struct src *psrc = (struct src *)SRC_BASE_ADDR;
	unsigned int reg = readl(&psrc->sbmr1) >> 11;
	/*
	 * Upon reading BOOT_CFG register the following map is done:
	 * Bit 11 and 12 of BOOT_CFG register can determine the current
	 * mmc port
	 * 0x1                  SD1
	 * 0x3                  SD4
	 */

	switch (reg & 0x3) {
	case 0x1:
		SETUP_IOMUX_PADS(usdhc2_pads);
		usdhc_cfg[0].esdhc_base = USDHC2_BASE_ADDR;
		usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
		gd->arch.sdhc_clk = usdhc_cfg[0].sdhc_clk;
		break;
	case 0x3:
		SETUP_IOMUX_PADS(usdhc4_pads);
		usdhc_cfg[0].esdhc_base = USDHC4_BASE_ADDR;
		usdhc_cfg[0].sdhc_clk = mxc_get_clock(MXC_ESDHC4_CLK);
		gd->arch.sdhc_clk = usdhc_cfg[0].sdhc_clk;
		break;
	}

	return fsl_esdhc_initialize(bd, &usdhc_cfg[0]);
}

void board_init_f(ulong dummy)
{
	/* setup AIPS and disable watchdog */
	arch_cpu_init();

	ccgr_init();
	gpr_init();

	/* setup GP timer */
	timer_init();

	setup_iomux_sd();
	setup_iomux_uart();
	setup_iomux_usb();

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

	/* DDR initialization */
	spl_dram_init();

	/* Clear the BSS. */
	memset(__bss_start, 0, __bss_end - __bss_start);

	/* load/boot image from boot device */
	board_init_r(NULL, 0);
}