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ARM: imx6ul: Add support for liteSOM

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liteSOM is a System On Module (http://grinn-global.com/litesom/). It
can't exists on its own, but will be used as part of other boards.

Hardware specification:
 * NXP i.MX6UL processor
 * 256M or 512M DDR3 memory
 * optional eMMC (uSDHC2)

Here we treat SOM similar to SOC, so we place it inside arch/arm/mach-*
directory and make it possible to reuse initialization code (i.e. DDR,
eMMC init) for all boards that use it.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
This commit is contained in:
Marcin Niestroj 2016-12-07 16:46:32 +01:00 committed by Stefano Babic
parent a11e30f8c8
commit 727feafebb
6 changed files with 231 additions and 0 deletions
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2
arch/arm/Kconfig
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@ -900,6 +900,8 @@ source "arch/arm/mach-keystone/Kconfig"
source "arch/arm/mach-kirkwood/Kconfig"
source "arch/arm/mach-litesom/Kconfig"
source "arch/arm/mach-mvebu/Kconfig"
source "arch/arm/cpu/armv7/ls102xa/Kconfig"

1
arch/arm/Makefile
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@ -58,6 +58,7 @@ machine-$(CONFIG_ARCH_HIGHBANK) += highbank
machine-$(CONFIG_ARCH_KEYSTONE) += keystone
# TODO: rename CONFIG_KIRKWOOD -> CONFIG_ARCH_KIRKWOOD
machine-$(CONFIG_KIRKWOOD) += kirkwood
machine-$(CONFIG_LITESOM) += litesom
machine-$(CONFIG_ARCH_MESON) += meson
machine-$(CONFIG_ARCH_MVEBU) += mvebu
# TODO: rename CONFIG_TEGRA -> CONFIG_ARCH_TEGRA

6
arch/arm/mach-litesom/Kconfig Normal file
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@ -0,0 +1,6 @@
config LITESOM
bool
select MX6UL
select DM
select DM_THERMAL
select SUPPORT_SPL

6
arch/arm/mach-litesom/Makefile Normal file
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@ -0,0 +1,6 @@
# (C) Copyright 2016 Grinn
#
# SPDX-License-Identifier: GPL-2.0+
#
obj-y := litesom.o

16
arch/arm/mach-litesom/include/mach/litesom.h Normal file
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@ -0,0 +1,16 @@
/*
* Copyright (C) 2016 Grinn
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ARCH_ARM_MACH_LITESOM_SOM_H__
#define __ARCH_ARM_MACH_LITESOM_SOM_H__
int litesom_mmc_init(bd_t *bis);
#ifdef CONFIG_SPL_BUILD
void litesom_init_f(void);
#endif
#endif

200
arch/arm/mach-litesom/litesom.c Normal file
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@ -0,0 +1,200 @@
/*
* Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
* Copyright (C) 2016 Grinn
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/arch/clock.h>
#include <asm/arch/iomux.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/crm_regs.h>
#include <asm/arch/mx6ul_pins.h>
#include <asm/arch/mx6-pins.h>
#include <asm/arch/sys_proto.h>
#include <asm/gpio.h>
#include <asm/imx-common/iomux-v3.h>
#include <asm/imx-common/boot_mode.h>
#include <asm/io.h>
#include <common.h>
#include <fsl_esdhc.h>
#include <linux/sizes.h>
#include <mmc.h>
DECLARE_GLOBAL_DATA_PTR;
#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)
int dram_init(void)
{
gd->ram_size = imx_ddr_size();
return 0;
}
static iomux_v3_cfg_t const emmc_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),
/* RST_B */
MX6_PAD_NAND_ALE__GPIO4_IO10 | MUX_PAD_CTRL(NO_PAD_CTRL),
};
#ifdef CONFIG_FSL_ESDHC
static struct fsl_esdhc_cfg emmc_cfg = {USDHC2_BASE_ADDR, 0, 8};
#define EMMC_PWR_GPIO IMX_GPIO_NR(4, 10)
int litesom_mmc_init(bd_t *bis)
{
int ret;
/* eMMC */
imx_iomux_v3_setup_multiple_pads(emmc_pads, ARRAY_SIZE(emmc_pads));
gpio_direction_output(EMMC_PWR_GPIO, 0);
udelay(500);
gpio_direction_output(EMMC_PWR_GPIO, 1);
emmc_cfg.sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
ret = fsl_esdhc_initialize(bis, &emmc_cfg);
if (ret) {
printf("Warning: failed to initialize mmc dev 1 (eMMC)\n");
return ret;
}
return 0;
}
#endif
#ifdef CONFIG_SPL_BUILD
#include <libfdt.h>
#include <spl.h>
#include <asm/arch/mx6-ddr.h>
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 = 0x41570155,
.p0_mprddlctl = 0x4040474A,
.p0_mpwrdlctl = 0x40405550,
};
struct mx6_ddr_sysinfo ddr_sysinfo = {
.dsize = 0,
.cs_density = 20,
.ncs = 1,
.cs1_mirror = 0,
.rtt_wr = 2,
.rtt_nom = 1, /* RTT_Nom = RZQ/2 */
.walat = 0, /* 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) */
.ddr_type = DDR_TYPE_DDR3,
.refsel = 0, /* Refresh cycles at 64KHz */
.refr = 1, /* 2 refresh commands per refresh cycle */
};
static struct mx6_ddr3_cfg mem_ddr = {
.mem_speed = 800,
.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);
writel(0xFFFFFFFF, &ccm->CCGR7);
}
static void spl_dram_init(void)
{
unsigned long ram_size;
mx6ul_dram_iocfg(mem_ddr.width, &mx6_ddr_ioregs, &mx6_grp_ioregs);
mx6_dram_cfg(&ddr_sysinfo, &mx6_mmcd_calib, &mem_ddr);
/*
* Get actual RAM size, so we can adjust DDR row size for <512M
* memories
*/
ram_size = get_ram_size((void *)CONFIG_SYS_SDRAM_BASE, SZ_512M);
if (ram_size < SZ_512M) {
mem_ddr.rowaddr = 14;
mx6_dram_cfg(&ddr_sysinfo, &mx6_mmcd_calib, &mem_ddr);
}
}
void litesom_init_f(void)
{
ccgr_init();
/* setup AIPS and disable watchdog */
arch_cpu_init();
#ifdef CONFIG_BOARD_EARLY_INIT_F
board_early_init_f();
#endif
/* setup GP timer */
timer_init();
/* UART clocks enabled and gd valid - init serial console */
preloader_console_init();
/* DDR initialization */
spl_dram_init();
}
#endif