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 --- arch/arm/Kconfig | 2 + arch/arm/Makefile | 1 + arch/arm/mach-litesom/Kconfig | 6 + arch/arm/mach-litesom/Makefile | 6 + arch/arm/mach-litesom/include/mach/litesom.h | 16 +++ arch/arm/mach-litesom/litesom.c | 200 +++++++++++++++++++++++++++ 6 files changed, 231 insertions(+) create mode 100644 arch/arm/mach-litesom/Kconfig create mode 100644 arch/arm/mach-litesom/Makefile create mode 100644 arch/arm/mach-litesom/include/mach/litesom.h create mode 100644 arch/arm/mach-litesom/litesom.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index e63309a..bf5ac39 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -917,6 +917,8 @@ 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/mx7/Kconfig" diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 42093c2..3e804d7 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -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 diff --git a/arch/arm/mach-litesom/Kconfig b/arch/arm/mach-litesom/Kconfig new file mode 100644 index 0000000..9b7f36d --- /dev/null +++ b/arch/arm/mach-litesom/Kconfig @@ -0,0 +1,6 @@ +config LITESOM + bool + select MX6UL + select DM + select DM_THERMAL + select SUPPORT_SPL diff --git a/arch/arm/mach-litesom/Makefile b/arch/arm/mach-litesom/Makefile new file mode 100644 index 0000000..b15eb64 --- /dev/null +++ b/arch/arm/mach-litesom/Makefile @@ -0,0 +1,6 @@ +# (C) Copyright 2016 Grinn +# +# SPDX-License-Identifier: GPL-2.0+ +# + +obj-y := litesom.o diff --git a/arch/arm/mach-litesom/include/mach/litesom.h b/arch/arm/mach-litesom/include/mach/litesom.h new file mode 100644 index 0000000..6833949 --- /dev/null +++ b/arch/arm/mach-litesom/include/mach/litesom.h @@ -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 diff --git a/arch/arm/mach-litesom/litesom.c b/arch/arm/mach-litesom/litesom.c new file mode 100644 index 0000000..ac2eccf --- /dev/null +++ b/arch/arm/mach-litesom/litesom.c @@ -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