board/bticino/mamoj/spl.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2018 Simone CIANNI <simone.cianni@bticino.it>
 * Copyright (C) 2018 Raffaele RECALCATI <raffaele.recalcati@bticino.it>
 * Copyright (C) 2018 Jagan Teki <jagan@amarulasolutions.com>
 */

#include <init.h>
#include <serial.h>
#include <spl.h>
#include <asm/global_data.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <linux/sizes.h>

#include <asm/arch/clock.h>
#include <asm/arch/crm_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>

DECLARE_GLOBAL_DATA_PTR;

#define IMX6SDL_DRIVE_STRENGTH		0x28
#define UART_PAD_CTRL	(PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED | \
			PAD_CTL_DSE_40ohm | PAD_CTL_SRE_FAST  | PAD_CTL_HYS)

static iomux_v3_cfg_t const uart3_pads[] = {
	IOMUX_PADS(PAD_EIM_D24__UART3_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
	IOMUX_PADS(PAD_EIM_D25__UART3_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
};

#ifdef CONFIG_SPL_OS_BOOT
int spl_start_uboot(void)
{
	/* break into full u-boot on 'c' */
	if (serial_tstc() && serial_getc() == 'c')
		return 1;

	return 0;
}
#endif

struct mx6sdl_iomux_ddr_regs mx6sdl_ddr_ioregs = {
	.dram_sdclk_0 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdclk_1 = IMX6SDL_DRIVE_STRENGTH,
	.dram_cas = IMX6SDL_DRIVE_STRENGTH,
	.dram_ras = IMX6SDL_DRIVE_STRENGTH,
	.dram_reset = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdcke0 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdcke1 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdba2 = 0x00000000,
	.dram_sdodt0 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdodt1 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs0 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs1 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs2 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs3 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs4 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs5 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs6 = IMX6SDL_DRIVE_STRENGTH,
	.dram_sdqs7 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm0 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm1 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm2 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm3 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm4 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm5 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm6 = IMX6SDL_DRIVE_STRENGTH,
	.dram_dqm7 = IMX6SDL_DRIVE_STRENGTH,
};

struct mx6sdl_iomux_grp_regs mx6sdl_grp_ioregs = {
	.grp_ddr_type = 0x000c0000,
	.grp_ddrmode_ctl = 0x00020000,
	.grp_ddrpke = 0x00000000,
	.grp_addds = IMX6SDL_DRIVE_STRENGTH,
	.grp_ctlds = IMX6SDL_DRIVE_STRENGTH,
	.grp_ddrmode = 0x00020000,
	.grp_b0ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b1ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b2ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b3ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b4ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b5ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b6ds = IMX6SDL_DRIVE_STRENGTH,
	.grp_b7ds = IMX6SDL_DRIVE_STRENGTH,
};

static struct mx6_ddr3_cfg mt41k128m16jt_125 = {
	.mem_speed = 1600,
	.density = 4,
	.width = 32,
	.banks = 8,
	.rowaddr = 14,
	.coladdr = 10,
	.pagesz = 2,
	.trcd = 1375,
	.trcmin = 4875,
	.trasmin = 3500,
	.SRT = 0,
};

static struct mx6_mmdc_calibration mx6dl_mmdc_calib = {
	.p0_mpwldectrl0 = 0x0042004b,
	.p0_mpwldectrl1 = 0x0038003c,
	.p0_mpdgctrl0 = 0x42340230,
	.p0_mpdgctrl1 = 0x0228022c,
	.p0_mprddlctl = 0x42444646,
	.p0_mpwrdlctl = 0x38382e2e,
};

static struct mx6_ddr_sysinfo mem_dl = {
	.dsize		= 1,
	.cs1_mirror	= 0,
	/* config for full 4GB range so that get_mem_size() works */
	.cs_density	= 32,
	.ncs		= 1,
	.bi_on		= 1,
	.rtt_nom	= 1,
	.rtt_wr		= 1,
	.ralat		= 5,
	.walat		= 0,
	.mif3_mode	= 3,
	.rst_to_cke	= 0x23,
	.sde_to_rst	= 0x10,
	.refsel		= 1,
	.refr		= 7,
};

static void spl_dram_init(void)
{
	mx6sdl_dram_iocfg(64, &mx6sdl_ddr_ioregs, &mx6sdl_grp_ioregs);
	mx6_dram_cfg(&mem_dl, &mx6dl_mmdc_calib, &mt41k128m16jt_125);

	udelay(100);
}

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

	writel(0x00003f3f, &ccm->CCGR0);
	writel(0x0030fc00, &ccm->CCGR1);
	writel(0x000fc000, &ccm->CCGR2);
	writel(0x3f300000, &ccm->CCGR3);
	writel(0xff00f300, &ccm->CCGR4);
	writel(0x0f0000c3, &ccm->CCGR5);
	writel(0x000003cc, &ccm->CCGR6);
}

void board_init_f(ulong dummy)
{
	ccgr_init();

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

	gpr_init();

	/* iomux */
	SETUP_IOMUX_PADS(uart3_pads);

	/* setup GP timer */
	timer_init();

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

	/* DDR initialization */
	spl_dram_init();
}