arm: add mach-nexell (all files except header files)

Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- SPL not supported yet --> no spl-directory in arch/arm/mach-nexell.
  Appropriate line in Makefile removed.
- clock.c: 'section(".data")' added to declaration of clk_periphs[] and
  core_hz.
- Kconfig: Changes to have a structure like in mach-bcm283x/Kconfig,
  e.g. "config ..." entries moved from other Kconfig.
- timer.c: 'section(".data")' added to declaration of timestamp and
  lastdec.
- arch/arm/mach-nexell/serial.c removed because this is for the UARTs
  of the S5P6818 SoC which is not supported yet. S5P4418 UARTs are
  different, here the (existing) PL011-code is used.
- '#ifdef CONFIG...' changed to 'if (IS_ENABLED(CONFIG...))' where
  possible (and similar).

Signed-off-by: Stefan Bosch <stefan_b@posteo.net>

13 files changed, 1999 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f951dca007..ded8cfee09 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -916,6 +916,11 @@ config ARCH_MX5
 	select CPU_V7A
 	imply MXC_GPIO
 
+config ARCH_NEXELL
+	bool "Nexell S5P4418/S5P6818 SoC"
+	select ENABLE_ARM_SOC_BOOT0_HOOK
+	select DM
+
 config ARCH_OWL
 	bool "Actions Semi OWL SoCs"
 	select DM
@@ -1892,6 +1897,8 @@ source "arch/arm/cpu/armv8/Kconfig"
 
 source "arch/arm/mach-imx/Kconfig"
 
+source "arch/arm/mach-nexell/Kconfig"
+
 source "board/bosch/shc/Kconfig"
 source "board/bosch/guardian/Kconfig"
 source "board/CarMediaLab/flea3/Kconfig"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index a20b82bc8d..bf3890e99b 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -66,6 +66,7 @@ machine-$(CONFIG_ARCH_LPC32XX)		+= lpc32xx
 machine-$(CONFIG_ARCH_MEDIATEK)		+= mediatek
 machine-$(CONFIG_ARCH_MESON)		+= meson
 machine-$(CONFIG_ARCH_MVEBU)		+= mvebu
+machine-$(CONFIG_ARCH_NEXELL)		+= nexell
 machine-$(CONFIG_ARCH_OMAP2PLUS)	+= omap2
 machine-$(CONFIG_ARCH_ORION5X)		+= orion5x
 machine-$(CONFIG_ARCH_OWL)		+= owl
diff --git a/arch/arm/mach-nexell/Kconfig b/arch/arm/mach-nexell/Kconfig
new file mode 100644
index 0000000000..ffa4d4865a
--- /dev/null
+++ b/arch/arm/mach-nexell/Kconfig
@@ -0,0 +1,58 @@
+if ARCH_NEXELL
+
+config ARCH_S5P4418
+	bool "Nexell S5P4418 SoC"
+	select CPU_V7A
+	select OF_CONTROL
+	select OF_SEPARATE
+	select NX_GPIO
+	select PL011_SERIAL
+	select PL011_SERIAL_FLUSH_ON_INIT
+	help
+	  Enable support for Nexell S5P4418 SoC.
+
+config ARCH_S5P6818
+	bool "Nexell S5P6818 SoC"
+	select ARM64
+	select ARMV8_MULTIENTRY
+	help
+	  Enable support for Nexell S5P6818 SoC.
+
+menu "Nexell S5P4418/S5P6818"
+	depends on ARCH_NEXELL
+
+choice
+	prompt "Nexell S5P4418/S5P6818 board select"
+	optional
+
+config TARGET_NANOPI2
+	bool "FriendlyARM NanoPi2 / NanoPC-T2 Board"
+	select ARCH_S5P4418
+	help
+	  Enable support for FriendlyARM NanoPi2 and NanoPC-T2 Boards.
+
+endchoice
+
+config SYS_BOARD
+	default "nanopi2"
+
+config SYS_VENDOR
+	default "friendlyarm"
+
+config SYS_SOC
+	default "nexell"
+
+config SYS_CONFIG_NAME
+	default "s5p4418_nanopi2"
+
+endmenu
+
+config SYS_PLLFIN
+	int
+
+config TIMER_SYS_TICK_CH
+	int
+
+source "board/friendlyarm/Kconfig"
+
+endif
diff --git a/arch/arm/mach-nexell/Makefile b/arch/arm/mach-nexell/Makefile
new file mode 100644
index 0000000000..10b3963ed1
--- /dev/null
+++ b/arch/arm/mach-nexell/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2016 Nexell
+# Hyunseok, Jung <hsjung@nexell.co.kr>
+
+obj-y				+= clock.o
+obj-y				+= timer.o
+obj-y				+= reset.o
+obj-y				+= nx_gpio.o
+obj-y				+= tieoff.o
+obj-$(CONFIG_ARCH_S5P4418)	+= reg-call.o
+obj-$(CONFIG_ARCH_S5P4418)	+= nx_sec_reg.o
+obj-$(CONFIG_CMD_BOOTL)		+= cmd_boot_linux.o
diff --git a/arch/arm/mach-nexell/clock.c b/arch/arm/mach-nexell/clock.c
new file mode 100644
index 0000000000..a0ba2d8e0c
--- /dev/null
+++ b/arch/arm/mach-nexell/clock.c
@@ -0,0 +1,869 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Hyunseok, Jung <hsjung@nexell.co.kr>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/err.h>
+#include <asm/io.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/clk.h>
+
+/*
+ * clock generator macros
+ */
+#define	I_PLL0_BIT		(0)
+#define	I_PLL1_BIT		(1)
+#define	I_PLL2_BIT		(2)
+#define	I_PLL3_BIT		(3)
+#define	I_EXT1_BIT		(4)
+#define	I_EXT2_BIT		(5)
+#define	I_CLKn_BIT		(7)
+#define	I_EXT1_BIT_FORCE	(8)
+#define	I_EXT2_BIT_FORCE	(9)
+
+#define	I_CLOCK_NUM		6 /* PLL0, PLL1, PLL2, PLL3, EXT1, EXT2 */
+
+#define I_EXECEPT_CLK		(0)
+#define	I_CLOCK_MASK		(((1 << I_CLOCK_NUM) - 1) & ~I_EXECEPT_CLK)
+
+#define	I_PLL0			(1 << I_PLL0_BIT)
+#define	I_PLL1			(1 << I_PLL1_BIT)
+#define	I_PLL2			(1 << I_PLL2_BIT)
+#define	I_PLL3			(1 << I_PLL3_BIT)
+#define	I_EXTCLK1		(1 << I_EXT1_BIT)
+#define	I_EXTCLK2		(1 << I_EXT2_BIT)
+#define	I_EXTCLK1_FORCE		(1 << I_EXT1_BIT_FORCE)
+#define	I_EXTCLK2_FORCE		(1 << I_EXT2_BIT_FORCE)
+
+#define	I_PLL_0_1		(I_PLL0    | I_PLL1)
+#define	I_PLL_0_2		(I_PLL_0_1 | I_PLL2)
+#define	I_PLL_0_3		(I_PLL_0_2 | I_PLL3)
+#define	I_CLKnOUT		(0)
+
+#define	I_PCLK			(1 << 16)
+#define	I_BCLK			(1 << 17)
+#define	I_GATE_PCLK		(1 << 20)
+#define	I_GATE_BCLK		(1 << 21)
+#define	I_PCLK_MASK		(I_GATE_PCLK | I_PCLK)
+#define	I_BCLK_MASK		(I_GATE_BCLK | I_BCLK)
+
+struct clk_dev_peri {
+	const char *dev_name;
+	void __iomem *base;
+	int dev_id;
+	int periph_id;
+	int clk_step;
+	u32 in_mask;
+	u32 in_mask1;
+	int div_src_0;
+	int div_val_0;
+	int invert_0;
+	int div_src_1;
+	int div_val_1;
+	int invert_1;
+	int in_extclk_1;
+	int in_extclk_2;
+};
+
+struct clk_dev {
+	struct clk  clk;
+	struct clk *link;
+	const char *name;
+	struct clk_dev_peri *peri;
+};
+
+struct clk_dev_map {
+	unsigned int con_enb;
+	unsigned int con_gen[4];
+};
+
+#define CLK_PERI_1S(name, devid, id, addr, mk)[id] = \
+	{ .dev_name = name, .dev_id = devid, .periph_id = id, .clk_step = 1, \
+	.base = (void *)addr, .in_mask = mk, }
+
+#define CLK_PERI_2S(name, devid, id, addr, mk, mk2)[id] = \
+	{ .dev_name = name, .dev_id = devid, .periph_id = id, .clk_step = 2, \
+	.base = (void *)addr, .in_mask = mk, .in_mask1 = mk2, }
+
+static const char * const clk_core[] = {
+	CORECLK_NAME_PLL0, CORECLK_NAME_PLL1, CORECLK_NAME_PLL2,
+	CORECLK_NAME_PLL3, CORECLK_NAME_FCLK, CORECLK_NAME_MCLK,
+	CORECLK_NAME_BCLK, CORECLK_NAME_PCLK, CORECLK_NAME_HCLK,
+};
+
+/*
+ * Section ".data" must be used because BSS is not available before relocation,
+ * in board_init_f(), respectively! I.e. global variables can not be used!
+ */
+static struct clk_dev_peri clk_periphs[]
+	__attribute__((section(".data"))) = {
+	CLK_PERI_1S(DEV_NAME_TIMER,	0,	CLK_ID_TIMER_0,
+		    PHY_BASEADDR_CLKGEN14, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_TIMER,	1,	CLK_ID_TIMER_1,
+		    PHY_BASEADDR_CLKGEN0, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_TIMER,	2,	CLK_ID_TIMER_2,
+		    PHY_BASEADDR_CLKGEN1, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_TIMER,	3,	CLK_ID_TIMER_3,
+		    PHY_BASEADDR_CLKGEN2, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_UART,	0,	CLK_ID_UART_0,
+		    PHY_BASEADDR_CLKGEN22, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_UART,	1,	CLK_ID_UART_1,
+		    PHY_BASEADDR_CLKGEN24, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_UART,	2,	CLK_ID_UART_2,
+		    PHY_BASEADDR_CLKGEN23, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_UART,	3,	CLK_ID_UART_3,
+		    PHY_BASEADDR_CLKGEN25, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_UART,	4,	CLK_ID_UART_4,
+		    PHY_BASEADDR_CLKGEN26, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_UART,	5,	CLK_ID_UART_5,
+		    PHY_BASEADDR_CLKGEN27, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_PWM,	0,	CLK_ID_PWM_0,
+		    PHY_BASEADDR_CLKGEN13, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_PWM,	1,	CLK_ID_PWM_1,
+		    PHY_BASEADDR_CLKGEN3, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_PWM,	2,	CLK_ID_PWM_2,
+		    PHY_BASEADDR_CLKGEN4, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_PWM,	3,	CLK_ID_PWM_3,
+		    PHY_BASEADDR_CLKGEN5, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_I2C,	0,	CLK_ID_I2C_0,
+		    PHY_BASEADDR_CLKGEN6, (I_GATE_PCLK)),
+	CLK_PERI_1S(DEV_NAME_I2C,	1,	CLK_ID_I2C_1,
+		    PHY_BASEADDR_CLKGEN7, (I_GATE_PCLK)),
+	CLK_PERI_1S(DEV_NAME_I2C,	2,	CLK_ID_I2C_2,
+		    PHY_BASEADDR_CLKGEN8, (I_GATE_PCLK)),
+	CLK_PERI_2S(DEV_NAME_GMAC,	0,	CLK_ID_GMAC,
+		    PHY_BASEADDR_CLKGEN10,
+		    (I_PLL_0_3 | I_EXTCLK1 | I_EXTCLK1_FORCE),
+		    (I_CLKnOUT)),
+	CLK_PERI_2S(DEV_NAME_I2S,	0,	CLK_ID_I2S_0,
+		    PHY_BASEADDR_CLKGEN15, (I_PLL_0_3 | I_EXTCLK1),
+		    (I_CLKnOUT)),
+	CLK_PERI_2S(DEV_NAME_I2S,	1,	CLK_ID_I2S_1,
+		    PHY_BASEADDR_CLKGEN16, (I_PLL_0_3 | I_EXTCLK1),
+		    (I_CLKnOUT)),
+	CLK_PERI_2S(DEV_NAME_I2S,	2,	CLK_ID_I2S_2,
+		    PHY_BASEADDR_CLKGEN17, (I_PLL_0_3 | I_EXTCLK1),
+		    (I_CLKnOUT)),
+	CLK_PERI_1S(DEV_NAME_SDHC,	0,	CLK_ID_SDHC_0,
+		    PHY_BASEADDR_CLKGEN18, (I_PLL_0_2 | I_GATE_PCLK)),
+	CLK_PERI_1S(DEV_NAME_SDHC,	1,	CLK_ID_SDHC_1,
+		    PHY_BASEADDR_CLKGEN19, (I_PLL_0_2 | I_GATE_PCLK)),
+	CLK_PERI_1S(DEV_NAME_SDHC,	2,	CLK_ID_SDHC_2,
+		    PHY_BASEADDR_CLKGEN20, (I_PLL_0_2 | I_GATE_PCLK)),
+	CLK_PERI_1S(DEV_NAME_SPI,	0,	CLK_ID_SPI_0,
+		    PHY_BASEADDR_CLKGEN37, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_SPI,	1,	CLK_ID_SPI_1,
+		    PHY_BASEADDR_CLKGEN38, (I_PLL_0_2)),
+	CLK_PERI_1S(DEV_NAME_SPI,	2,	CLK_ID_SPI_2,
+		    PHY_BASEADDR_CLKGEN39, (I_PLL_0_2)),
+};
+
+#define	CLK_PERI_NUM		((int)ARRAY_SIZE(clk_periphs))
+#define	CLK_CORE_NUM		((int)ARRAY_SIZE(clk_core))
+#define	CLK_DEVS_NUM		(CLK_CORE_NUM + CLK_PERI_NUM)
+#define	MAX_DIVIDER		((1 << 8) - 1)	/* 256, align 2 */
+
+static struct clk_dev		st_clk_devs[CLK_DEVS_NUM]
+				__attribute__((section(".data")));
+#define	clk_dev_get(n)		((struct clk_dev *)&st_clk_devs[n])
+#define	clk_container(p)	(container_of(p, struct clk_dev, clk))
+
+/*
+ * Core frequencys
+ */
+struct _core_hz_ {
+	unsigned long pll[4];					/* PLL */
+	unsigned long cpu_fclk, cpu_bclk;			/* cpu */
+	unsigned long mem_fclk, mem_dclk, mem_bclk, mem_pclk;	/* ddr */
+	unsigned long bus_bclk, bus_pclk;			/* bus */
+#if defined(CONFIG_ARCH_S5P6818)
+	unsigned long cci4_bclk, cci4_pclk;			/* cci */
+#endif
+	/* ip */
+	unsigned long g3d_bclk;
+	unsigned long coda_bclk, coda_pclk;
+#if defined(CONFIG_ARCH_S5P6818)
+	unsigned long disp_bclk, disp_pclk;
+	unsigned long hdmi_pclk;
+#endif
+};
+
+/*
+ * Section ".data" must be used because BSS is not available before relocation,
+ * in board_init_f(), respectively! I.e. global variables can not be used!
+ */
+/* core clock */
+static struct _core_hz_ core_hz __attribute__((section(".data")));
+
+#define	CORE_HZ_SIZE	(sizeof(core_hz) / 4)
+
+/*
+ * CLKGEN HW
+ */
+static inline void clk_dev_bclk(void *base, int on)
+{
+	struct clk_dev_map *reg = base;
+	unsigned int val = readl(&reg->con_enb) & ~(0x3);
+
+	val |= (on ? 3 : 0) & 0x3;	/* always BCLK */
+	writel(val, &reg->con_enb);
+}
+
+static inline void clk_dev_pclk(void *base, int on)
+{
+	struct clk_dev_map *reg = base;
+	unsigned int val = 0;
+
+	if (!on)
+		return;
+
+	val	 = readl(&reg->con_enb) & ~(1 << 3);
+	val |= (1 << 3);
+	writel(val, &reg->con_enb);
+}
+
+static inline void clk_dev_rate(void *base, int step, int src, int div)
+{
+	struct clk_dev_map *reg = base;
+	unsigned int val = 0;
+
+	val  = readl(&reg->con_gen[step << 1]);
+	val &= ~(0x07   << 2);
+	val |=  (src    << 2);	/* source */
+	val	&= ~(0xFF   << 5);
+	val	|=  (div - 1) << 5;	/* divider */
+	writel(val, &reg->con_gen[step << 1]);
+}
+
+static inline void clk_dev_inv(void *base, int step, int inv)
+{
+	struct clk_dev_map *reg = base;
+	unsigned int val = readl(&reg->con_gen[step << 1]) & ~(1 << 1);
+
+	val	|= (inv << 1);
+	writel(val, &reg->con_gen[step << 1]);
+}
+
+static inline void clk_dev_enb(void *base, int on)
+{
+	struct clk_dev_map *reg = base;
+	unsigned int val = readl(&reg->con_enb) & ~(1 << 2);
+
+	val	|= ((on ? 1 : 0) << 2);
+	writel(val, &reg->con_enb);
+}
+
+/*
+ * CORE FREQUENCY
+ *
+ * PLL0 [P,M,S]	-------	| | ----- [DIV0] --- CPU-G0
+ *			|M| ----- [DIV1] --- BCLK/PCLK
+ * PLL1 [P,M,S]	-------	| | ----- [DIV2] --- DDR
+ *			|U| ----- [DIV3] --- 3D
+ * PLL2 [P,M,S,K]-------| | ----- [DIV4] --- CODA
+ *			|X| ----- [DIV5] --- DISPLAY
+ * PLL3 [P,M,S,K]-------| | ----- [DIV6] --- HDMI
+ *			| | ----- [DIV7] --- CPU-G1
+ *			| | ----- [DIV8] --- CCI-400(FASTBUS)
+ *
+ */
+
+struct	nx_clkpwr_registerset {
+	u32 clkmodereg0;	/* 0x000 : Clock Mode Register0 */
+	u32 __reserved0;	/* 0x004 */
+	u32 pllsetreg[4];	/* 0x008 ~ 0x014 : PLL Setting Register */
+	u32 __reserved1[2];	/* 0x018 ~ 0x01C */
+	u32 dvoreg[9];		/* 0x020 ~ 0x040 : Divider Setting Register */
+	u32 __Reserved2;	/* 0x044 */
+	u32 pllsetreg_sscg[6];	/* 0x048 ~ 0x05C */
+	u32 __reserved3[8];		/* 0x060 ~ 0x07C */
+	u8 __reserved4[0x200 - 0x80];	/* padding (0x80 ~ 0x1FF) */
+	u32 gpiowakeupriseenb;	/* 0x200 : GPIO Rising Edge Detect En. Reg. */
+	u32 gpiowakeupfallenb;	/* 0x204 : GPIO Falling Edge Detect En. Reg. */
+	u32 gpiorstenb;		/* 0x208 : GPIO Reset Enable Register */
+	u32 gpiowakeupenb;	/* 0x20C : GPIO Wakeup Source Enable */
+	u32 gpiointenb;		/* 0x210 : Interrupt Enable Register */
+	u32 gpiointpend;	/* 0x214 : Interrupt Pend Register */
+	u32 resetstatus;	/* 0x218 : Reset Status Register */
+	u32 intenable;		/* 0x21C : Interrupt Enable Register */
+	u32 intpend;		/* 0x220 : Interrupt Pend Register */
+	u32 pwrcont;		/* 0x224 : Power Control Register */
+	u32 pwrmode;		/* 0x228 : Power Mode Register */
+	u32 __reserved5;	/* 0x22C : Reserved Region */
+	u32 scratch[3];		/* 0x230 ~ 0x238 : Scratch Register */
+	u32 sysrstconfig;	/* 0x23C : System Reset Configuration Reg. */
+	u8  __reserved6[0x2A0 - 0x240];	/* padding (0x240 ~ 0x29F) */
+	u32 cpupowerdownreq;	/* 0x2A0 : CPU Power Down Request Register */
+	u32 cpupoweronreq;	/* 0x2A4 : CPU Power On Request Register */
+	u32 cpuresetmode;	/* 0x2A8 : CPU Reset Mode Register */
+	u32 cpuwarmresetreq;	/* 0x2AC : CPU Warm Reset Request Register */
+	u32 __reserved7;	/* 0x2B0 */
+	u32 cpustatus;		/* 0x2B4 : CPU Status Register */
+	u8  __reserved8[0x400 - 0x2B8];	/* padding (0x2B8 ~ 0x33F) */
+};
+
+static struct nx_clkpwr_registerset * const clkpwr =
+	(struct nx_clkpwr_registerset *)PHY_BASEADDR_CLKPWR;
+
+#define	getquotient(v, d)	((v) / (d))
+
+#define	DIV_CPUG0	0
+#define	DIV_BUS		1
+#define	DIV_MEM		2
+#define	DIV_G3D		3
+#define	DIV_CODA	4
+#if defined(CONFIG_ARCH_S5P6818)
+#define	DIV_DISP	5
+#define	DIV_HDMI	6
+#define	DIV_CPUG1	7
+#define	DIV_CCI4	8
+#endif
+
+#define	DVO0		3
+#define	DVO1		9
+#define	DVO2		15
+#define	DVO3		21
+
+static unsigned int pll_rate(unsigned int plln, unsigned int xtal)
+{
+	unsigned int val, val1, nP, nM, nS, nK;
+	unsigned int temp = 0;
+
+	val   = clkpwr->pllsetreg[plln];
+	val1  = clkpwr->pllsetreg_sscg[plln];
+	xtal /= 1000;	/* Unit Khz */
+
+	nP = (val >> 18) & 0x03F;
+	nM = (val >>  8) & 0x3FF;
+	nS = (val >>  0) & 0x0FF;
+	nK = (val1 >> 16) & 0xFFFF;
+
+	if (plln > 1 && nK) {
+		temp = (unsigned int)(getquotient((getquotient((nK * 1000),
+			65536) * xtal), nP) >> nS);
+	}
+
+	temp = (unsigned int)((getquotient((nM * xtal), nP) >> nS) * 1000)
+	       + temp;
+	return temp;
+}
+
+static unsigned int pll_dvo(int dvo)
+{
+	unsigned int val;
+
+	val = (clkpwr->dvoreg[dvo] & 0x7);
+	return val;
+}
+
+static unsigned int pll_div(int dvo)
+{
+	unsigned int val = clkpwr->dvoreg[dvo];
+
+	return  ((((val >> DVO3) & 0x3F) + 1) << 24)  |
+			((((val >> DVO2) & 0x3F) + 1) << 16) |
+			((((val >> DVO1) & 0x3F) + 1) << 8)  |
+			((((val >> DVO0) & 0x3F) + 1) << 0);
+}
+
+#define	PLLN_RATE(n)	 (pll_rate(n, CONFIG_SYS_PLLFIN))	/* 0~ 3 */
+#define	CPU_FCLK_RATE(n) (pll_rate(pll_dvo(n), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(n) >> 0) & 0x3F))
+#define	CPU_BCLK_RATE(n) (pll_rate(pll_dvo(n), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(n) >> 0) & 0x3F) /               \
+			 ((pll_div(n) >> 8) & 0x3F))
+
+#define	MEM_FCLK_RATE()	 (pll_rate(pll_dvo(DIV_MEM), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_MEM) >> 0) & 0x3F) / \
+			 ((pll_div(DIV_MEM) >> 8) & 0x3F))
+
+#define	MEM_DCLK_RATE()	 (pll_rate(pll_dvo(DIV_MEM), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_MEM) >> 0) & 0x3F))
+
+#define	MEM_BCLK_RATE()	 (pll_rate(pll_dvo(DIV_MEM), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_MEM) >> 0) & 0x3F) / \
+			 ((pll_div(DIV_MEM) >> 8) & 0x3F) / \
+			 ((pll_div(DIV_MEM) >> 16) & 0x3F))
+#define	MEM_PCLK_RATE()	 (pll_rate(pll_dvo(DIV_MEM), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_MEM) >> 0) & 0x3F) / \
+			 ((pll_div(DIV_MEM) >> 8) & 0x3F) / \
+			 ((pll_div(DIV_MEM) >> 16) & 0x3F) / \
+			 ((pll_div(DIV_MEM) >> 24) & 0x3F))
+
+#define	BUS_BCLK_RATE()	 (pll_rate(pll_dvo(DIV_BUS), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_BUS) >> 0) & 0x3F))
+#define	BUS_PCLK_RATE()	 (pll_rate(pll_dvo(DIV_BUS), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_BUS) >> 0) & 0x3F) / \
+			 ((pll_div(DIV_BUS) >> 8) & 0x3F))
+
+#define	G3D_BCLK_RATE()	 (pll_rate(pll_dvo(DIV_G3D), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_G3D) >> 0) & 0x3F))
+
+#define	MPG_BCLK_RATE()	 (pll_rate(pll_dvo(DIV_CODA), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_CODA) >> 0) & 0x3F))
+#define	MPG_PCLK_RATE()	 (pll_rate(pll_dvo(DIV_CODA), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_CODA) >> 0) & 0x3F)	/ \
+			 ((pll_div(DIV_CODA) >> 8) & 0x3F))
+
+#if defined(CONFIG_ARCH_S5P6818)
+#define	DISP_BCLK_RATE() (pll_rate(pll_dvo(DIV_DISP), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_DISP) >> 0) & 0x3F))
+#define	DISP_PCLK_RATE() (pll_rate(pll_dvo(DIV_DISP), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_DISP) >> 0) & 0x3F)	/ \
+			 ((pll_div(DIV_DISP) >> 8) & 0x3F))
+
+#define	HDMI_PCLK_RATE() (pll_rate(pll_dvo(DIV_HDMI), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_HDMI) >> 0) & 0x3F))
+
+#define	CCI4_BCLK_RATE() (pll_rate(pll_dvo(DIV_CCI4), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_CCI4) >> 0) & 0x3F))
+#define	CCI4_PCLK_RATE() (pll_rate(pll_dvo(DIV_CCI4), CONFIG_SYS_PLLFIN) / \
+			 ((pll_div(DIV_CCI4) >> 0) & 0x3F)	/ \
+			 ((pll_div(DIV_CCI4) >> 8) & 0x3F))
+#endif
+
+static void core_update_rate(int type)
+{
+	switch (type) {
+	case  0:
+		core_hz.pll[0] = PLLN_RATE(0); break;
+	case  1:
+		core_hz.pll[1] = PLLN_RATE(1); break;
+	case  2:
+		core_hz.pll[2] = PLLN_RATE(2); break;
+	case  3:
+		core_hz.pll[3] = PLLN_RATE(3); break;
+	case  4:
+		core_hz.cpu_fclk = CPU_FCLK_RATE(DIV_CPUG0); break;
+	case  5:
+		core_hz.mem_fclk = MEM_FCLK_RATE(); break;
+	case  6:
+		core_hz.bus_bclk = BUS_BCLK_RATE(); break;
+	case  7:
+		core_hz.bus_pclk = BUS_PCLK_RATE(); break;
+	case  8:
+		core_hz.cpu_bclk = CPU_BCLK_RATE(DIV_CPUG0); break;
+	case  9:
+		core_hz.mem_dclk = MEM_DCLK_RATE(); break;
+	case 10:
+		core_hz.mem_bclk = MEM_BCLK_RATE(); break;
+	case 11:
+		core_hz.mem_pclk = MEM_PCLK_RATE(); break;
+	case 12:
+		core_hz.g3d_bclk = G3D_BCLK_RATE(); break;
+	case 13:
+		core_hz.coda_bclk = MPG_BCLK_RATE(); break;
+	case 14:
+		core_hz.coda_pclk = MPG_PCLK_RATE(); break;
+#if defined(CONFIG_ARCH_S5P6818)
+	case 15:
+		core_hz.disp_bclk = DISP_BCLK_RATE(); break;
+	case 16:
+		core_hz.disp_pclk = DISP_PCLK_RATE(); break;
+	case 17:
+		core_hz.hdmi_pclk = HDMI_PCLK_RATE(); break;
+	case 18:
+		core_hz.cci4_bclk = CCI4_BCLK_RATE(); break;
+	case 19:
+		core_hz.cci4_pclk = CCI4_PCLK_RATE(); break;
+#endif
+	};
+}
+
+static unsigned long core_get_rate(int type)
+{
+	unsigned long rate = 0;
+
+	switch (type) {
+	case  0:
+		rate = core_hz.pll[0];		break;
+	case  1:
+		rate = core_hz.pll[1];		break;
+	case  2:
+		rate = core_hz.pll[2];		break;
+	case  3:
+		rate = core_hz.pll[3];		break;
+	case  4:
+		rate = core_hz.cpu_fclk;	break;
+	case  5:
+		rate = core_hz.mem_fclk;	break;
+	case  6:
+		rate = core_hz.bus_bclk;	break;
+	case  7:
+		rate = core_hz.bus_pclk;	break;
+	case  8:
+		rate = core_hz.cpu_bclk;	break;
+	case  9:
+		rate = core_hz.mem_dclk;	break;
+	case 10:
+		rate = core_hz.mem_bclk;	break;
+	case 11:
+		rate = core_hz.mem_pclk;	break;
+	case 12:
+		rate = core_hz.g3d_bclk;	break;
+	case 13:
+		rate = core_hz.coda_bclk;	break;
+	case 14:
+		rate = core_hz.coda_pclk;	break;
+#if defined(CONFIG_ARCH_S5P6818)
+	case 15:
+		rate = core_hz.disp_bclk;	break;
+	case 16:
+		rate = core_hz.disp_pclk;	break;
+	case 17:
+		rate = core_hz.hdmi_pclk;	break;
+	case 18:
+		rate = core_hz.cci4_bclk;	break;
+	case 19:
+		rate = core_hz.cci4_pclk;	break;
+#endif
+	default:
+		printf("unknown core clock type %d ...\n", type);
+		break;
+	};
+	return rate;
+}
+
+static long core_set_rate(struct clk *clk, long rate)
+{
+	return clk->rate;
+}
+
+static void core_rate_init(void)
+{
+	int i;
+
+	for (i = 0; i < CORE_HZ_SIZE; i++)
+		core_update_rate(i);
+}
+
+/*
+ * Clock Interfaces
+ */
+static inline long clk_divide(long rate, long request,
+			      int align, int *divide)
+{
+	int div = (rate / request);
+	int max = MAX_DIVIDER & ~(align - 1);
+	int adv = (div & ~(align - 1)) + align;
+	long ret;
+
+	if (!div) {
+		if (divide)
+			*divide = 1;
+		return rate;
+	}
+
+	if (div != 1)
+		div &= ~(align - 1);
+
+	if (div != adv && abs(request - rate / div) > abs(request - rate / adv))
+		div = adv;
+
+	div = (div > max ? max : div);
+	if (divide)
+		*divide = div;
+
+	ret = rate / div;
+	return ret;
+}
+
+void clk_put(struct clk *clk)
+{
+}
+
+struct clk *clk_get(const char *id)
+{
+	struct clk_dev *cdev = clk_dev_get(0);
+	struct clk *clk = NULL;
+	const char *str = NULL, *c = NULL;
+	int i, devid;
+
+	if (id)
+		str = id;
+
+	for (i = 0; i < CLK_DEVS_NUM; i++, cdev++) {
+		if (!cdev->name)
+			continue;
+		if (!strncmp(cdev->name, str, strlen(cdev->name))) {
+			c = strrchr((const char *)str, (int)'.');
+			if (!c || !cdev->peri)
+				break;
+		devid = simple_strtoul(++c, NULL, 10);
+		if (cdev->peri->dev_id == devid)
+			break;
+		}
+	}
+	if (i < CLK_DEVS_NUM)
+		clk = &cdev->clk;
+	else
+		clk = &(clk_dev_get(7))->clk;	/* pclk */
+
+	return clk ? clk : ERR_PTR(-ENOENT);
+}
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	struct clk_dev *pll = NULL, *cdev = clk_container(clk);
+	struct clk_dev_peri *peri = cdev->peri;
+	unsigned long request = rate, rate_hz = 0;
+	unsigned int mask;
+	int step, div[2] = { 0, };
+	int i, n, clk2 = 0;
+	int start_src = 0, max_src = I_CLOCK_NUM;
+	short s1 = 0, s2 = 0, d1 = 0, d2 = 0;
+
+	if (!peri)
+		return core_set_rate(clk, rate);
+
+	step = peri->clk_step;
+	mask = peri->in_mask;
+	debug("clk: %s.%d request = %ld [input=0x%x]\n", peri->dev_name,
+	      peri->dev_id, rate, mask);
+
+	if (!(I_CLOCK_MASK & mask)) {
+		if (I_PCLK_MASK & mask)
+			return core_get_rate(CORECLK_ID_PCLK);
+		else if (I_BCLK_MASK & mask)
+			return core_get_rate(CORECLK_ID_BCLK);
+		else
+			return clk->rate;
+	}
+
+next:
+	if (peri->in_mask &  I_EXTCLK1_FORCE) {
+		start_src = 4; max_src = 5;
+	}
+	for (n = start_src ; max_src > n; n++) {
+		if (!(((mask & I_CLOCK_MASK) >> n) & 0x1))
+			continue;
+
+		if (n == I_EXT1_BIT) {
+			rate = peri->in_extclk_1;
+		} else if (n == I_EXT2_BIT) {
+			rate = peri->in_extclk_2;
+		} else {
+			pll  = clk_dev_get(n);
+			rate = pll->clk.rate;
+		}
+
+		if (!rate)
+			continue;
+
+		for (i = 0; step > i ; i++)
+			rate = clk_divide(rate, request, 2, &div[i]);
+
+		if (rate_hz && (abs(rate - request) > abs(rate_hz - request)))
+			continue;
+
+		debug("clk: %s.%d, pll.%d[%lu] request[%ld] calc[%ld]\n",
+		      peri->dev_name, peri->dev_id, n, pll->clk.rate,
+		      request, rate);
+
+		if (clk2) {
+			s1 = -1, d1 = -1;	/* not use */
+			s2 =  n, d2 = div[0];
+		} else {
+			s1 = n, d1 = div[0];
+			s2 = I_CLKn_BIT, d2 = div[1];
+		}
+		rate_hz = rate;
+	}
+
+	/* search 2th clock from input */
+	if (!clk2 && abs(rate_hz - request) &&
+	    peri->in_mask1 & ((1 << I_CLOCK_NUM) - 1)) {
+		clk2 = 1;
+		mask = peri->in_mask1;
+		step = 1;
+		goto next;
+	}
+	if (peri->in_mask &  I_EXTCLK1_FORCE) {
+		if (s1 == 0) {
+			s1 = 4; s2 = 7;
+			d1 = 1; d2 = 1;
+		}
+	}
+
+	peri->div_src_0 = s1, peri->div_val_0 = d1;
+	peri->div_src_1 = s2, peri->div_val_1 = d2;
+	clk->rate = rate_hz;
+
+	debug("clk: %s.%d, step[%d] src[%d,%d] %ld", peri->dev_name,
+	      peri->dev_id, peri->clk_step, peri->div_src_0, peri->div_src_1,
+	      rate);
+	debug("/(div0: %d * div1: %d) = %ld, %ld diff (%ld)\n",
+	      peri->div_val_0, peri->div_val_1, rate_hz, request,
+	      abs(rate_hz - request));
+
+	return clk->rate;
+}
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	struct clk_dev *cdev = clk_container(clk);
+
+	if (cdev->link)
+		clk = cdev->link;
+	return clk->rate;
+}
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	struct clk_dev *cdev = clk_container(clk);
+	struct clk_dev_peri *peri = cdev->peri;
+	int i;
+
+	if (!peri)
+		return core_set_rate(clk, rate);
+
+	clk_round_rate(clk, rate);
+
+	for (i = 0; peri->clk_step > i ; i++)	{
+		int s = (i == 0 ? peri->div_src_0 : peri->div_src_1);
+		int d = (i == 0 ? peri->div_val_0 : peri->div_val_1);
+
+		if (-1 == s)
+			continue;
+
+		clk_dev_rate(peri->base, i, s, d);
+
+		debug("clk: %s.%d (%p) set_rate [%d] src[%d] div[%d]\n",
+		      peri->dev_name, peri->dev_id, peri->base, i, s, d);
+	}
+
+	return clk->rate;
+}
+
+int clk_enable(struct clk *clk)
+{
+	struct clk_dev *cdev = clk_container(clk);
+	struct clk_dev_peri *peri = cdev->peri;
+	int i = 0, inv = 0;
+
+	if (!peri)
+		return 0;
+
+	debug("clk: %s.%d enable (BCLK=%s, PCLK=%s)\n", peri->dev_name,
+	      peri->dev_id, I_GATE_BCLK & peri->in_mask ? "ON" : "PASS",
+	      I_GATE_PCLK & peri->in_mask ? "ON" : "PASS");
+
+	if (!(I_CLOCK_MASK & peri->in_mask)) {
+		/* Gated BCLK/PCLK enable */
+		if (I_GATE_BCLK & peri->in_mask)
+			clk_dev_bclk(peri->base, 1);
+
+		if (I_GATE_PCLK & peri->in_mask)
+			clk_dev_pclk(peri->base, 1);
+
+		return 0;
+	}
+
+	/* invert */
+	inv = peri->invert_0;
+	for (; peri->clk_step > i; i++, inv = peri->invert_1)
+		clk_dev_inv(peri->base, i, inv);
+
+	/* Gated BCLK/PCLK enable */
+	if (I_GATE_BCLK & peri->in_mask)
+		clk_dev_bclk(peri->base, 1);
+
+	if (I_GATE_PCLK & peri->in_mask)
+		clk_dev_pclk(peri->base, 1);
+
+	/* restore clock rate */
+	for (i = 0; peri->clk_step > i ; i++)	{
+		int s = (i == 0 ? peri->div_src_0 : peri->div_src_1);
+		int d = (i == 0 ? peri->div_val_0 : peri->div_val_1);
+
+		if (s == -1)
+			continue;
+		clk_dev_rate(peri->base, i, s, d);
+	}
+
+	clk_dev_enb(peri->base, 1);
+
+	return 0;
+}
+
+void clk_disable(struct clk *clk)
+{
+	struct clk_dev *cdev = clk_container(clk);
+	struct clk_dev_peri *peri = cdev->peri;
+
+	if (!peri)
+		return;
+
+	debug("clk: %s.%d disable\n", peri->dev_name, peri->dev_id);
+
+	if (!(I_CLOCK_MASK & peri->in_mask)) {
+		/* Gated BCLK/PCLK disable */
+		if (I_GATE_BCLK & peri->in_mask)
+			clk_dev_bclk(peri->base, 0);
+
+		if (I_GATE_PCLK & peri->in_mask)
+			clk_dev_pclk(peri->base, 0);
+
+		return;
+	}
+
+	clk_dev_rate(peri->base, 0, 7, 256);	/* for power save */
+	clk_dev_enb(peri->base, 0);
+
+	/* Gated BCLK/PCLK disable */
+	if (I_GATE_BCLK & peri->in_mask)
+		clk_dev_bclk(peri->base, 0);
+
+	if (I_GATE_PCLK & peri->in_mask)
+		clk_dev_pclk(peri->base, 0);
+}
+
+/*
+ * Core clocks APIs
+ */
+void __init clk_init(void)
+{
+	struct clk_dev *cdev = st_clk_devs;
+	struct clk_dev_peri *peri = clk_periphs;
+	struct clk *clk = NULL;
+	int i = 0;
+
+	memset(cdev, 0, sizeof(st_clk_devs));
+	core_rate_init();
+
+	for (i = 0; (CLK_CORE_NUM + CLK_PERI_NUM) > i; i++, cdev++) {
+		if (i < CLK_CORE_NUM) {
+			cdev->name = clk_core[i];
+			clk = &cdev->clk;
+			clk->rate = core_get_rate(i);
+			continue;
+		}
+
+		peri = &clk_periphs[i - CLK_CORE_NUM];
+		peri->base = (void *)peri->base;
+
+		cdev->peri = peri;
+		cdev->name = peri->dev_name;
+
+		if (!(I_CLOCK_MASK & peri->in_mask)) {
+			if (I_BCLK_MASK & peri->in_mask)
+				cdev->clk.rate = core_get_rate(CORECLK_ID_BCLK);
+			if (I_PCLK_MASK & peri->in_mask)
+				cdev->clk.rate = core_get_rate(CORECLK_ID_PCLK);
+		}
+
+		/* prevent uart clock disable for low step debug message */
+		#ifndef CONFIG_DEBUG_NX_UART
+		if (peri->dev_name) {
+			#ifdef CONFIG_BACKLIGHT_PWM
+			if (!strcmp(peri->dev_name, DEV_NAME_PWM))
+				continue;
+			#endif
+		}
+		#endif
+	}
+	debug("CPU : Clock Generator= %d EA, ", CLK_DEVS_NUM);
+}
diff --git a/arch/arm/mach-nexell/cmd_boot_linux.c b/arch/arm/mach-nexell/cmd_boot_linux.c
new file mode 100644
index 0000000000..f2dedfe162
--- /dev/null
+++ b/arch/arm/mach-nexell/cmd_boot_linux.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 nexell
+ * jhkim <jhkim@nexell.co.kr>
+ */
+
+#include <common.h>
+#include <bootm.h>
+#include <command.h>
+#include <environment.h>
+#include <errno.h>
+#include <image.h>
+#include <fdt_support.h>
+
+#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_CLI_FRAMEWORK)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static bootm_headers_t linux_images;
+
+static void boot_go_set_os(cmd_tbl_t *cmdtp, int flag, int argc,
+			   char * const argv[],
+			   bootm_headers_t *images)
+{
+	char * const img_addr = argv[0];
+
+	images->os.type = IH_TYPE_KERNEL;
+	images->os.comp = IH_COMP_NONE;
+	images->os.os = IH_OS_LINUX;
+	images->os.load = simple_strtoul(img_addr, NULL, 16);
+	images->ep = images->os.load;
+#if defined(CONFIG_ARM)
+	images->os.arch = IH_ARCH_ARM;
+#elif defined(CONFIG_ARM64)
+	images->os.arch = IH_ARCH_ARM64;
+#else
+	#error "Not support architecture ..."
+#endif
+	if (!IS_ENABLED(CONFIG_OF_LIBFDT) && !IS_ENABLED(CONFIG_SPL_BUILD)) {
+		/* set DTB address for linux kernel */
+		if (argc > 2) {
+			unsigned long ft_addr;
+
+			ft_addr = simple_strtol(argv[2], NULL, 16);
+			images->ft_addr = (char *)ft_addr;
+
+			/*
+			 * if not defined IMAGE_ENABLE_OF_LIBFDT,
+			 * must be set to fdt address
+			 */
+			if (!IMAGE_ENABLE_OF_LIBFDT)
+				gd->bd->bi_boot_params = ft_addr;
+
+			debug("## set ft:%08lx and boot params:%08lx [control of:%s]"
+			      "...\n", ft_addr, gd->bd->bi_boot_params,
+			      IMAGE_ENABLE_OF_LIBFDT ? "on" : "off");
+		}
+	}
+}
+
+#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_LMB)
+static void boot_start_lmb(bootm_headers_t *images)
+{
+	ulong		mem_start;
+	phys_size_t	mem_size;
+
+	lmb_init(&images->lmb);
+
+	mem_start = getenv_bootm_low();
+	mem_size = getenv_bootm_size();
+
+	lmb_add(&images->lmb, (phys_addr_t)mem_start, mem_size);
+
+	arch_lmb_reserve(&images->lmb);
+	board_lmb_reserve(&images->lmb);
+}
+#else
+#define lmb_reserve(lmb, base, size)
+static inline void boot_start_lmb(bootm_headers_t *images) { }
+#endif
+
+int do_boot_linux(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	boot_os_fn *boot_fn;
+	bootm_headers_t *images = &linux_images;
+	int flags;
+	int ret;
+
+	boot_start_lmb(images);
+
+	flags  = BOOTM_STATE_START;
+
+	argc--; argv++;
+	boot_go_set_os(cmdtp, flag, argc, argv, images);
+
+	if (IS_ENABLED(CONFIG_OF_LIBFDT)) {
+		/* find flattened device tree */
+		ret = boot_get_fdt(flag, argc, argv, IH_ARCH_DEFAULT, images,
+				   &images->ft_addr, &images->ft_len);
+		if (ret) {
+			puts("Could not find a valid device tree\n");
+			return 1;
+		}
+		set_working_fdt_addr((ulong)images->ft_addr);
+	}
+
+	if (!IS_ENABLED(CONFIG_OF_LIBFDT))
+		flags |= BOOTM_STATE_OS_GO;
+
+	boot_fn = do_bootm_linux;
+	ret = boot_fn(flags, argc, argv, images);
+
+	if (ret == BOOTM_ERR_UNIMPLEMENTED)
+		show_boot_progress(BOOTSTAGE_ID_DECOMP_UNIMPL);
+	else if (ret == BOOTM_ERR_RESET)
+		do_reset(cmdtp, flag, argc, argv);
+
+	return ret;
+}
+
+U_BOOT_CMD(bootl, CONFIG_SYS_MAXARGS, 1, do_boot_linux,
+	   "boot linux image from memory",
+	   "[addr [arg ...]]\n    - boot linux image stored in memory\n"
+	   "\tuse a '-' for the DTB address\n"
+);
+#endif
+
+#if defined(CONFIG_CMD_BOOTD) && !defined(CONFIG_CMD_BOOTM)
+int do_bootd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	return run_command(env_get("bootcmd"), flag);
+}
+
+U_BOOT_CMD(boot, 1, 1, do_bootd,
+	   "boot default, i.e., run 'bootcmd'",
+	   ""
+);
+
+/* keep old command name "bootd" for backward compatibility */
+U_BOOT_CMD(bootd, 1,	1,	do_bootd,
+	   "boot default, i.e., run 'bootcmd'",
+	   ""
+);
+#endif
diff --git a/arch/arm/mach-nexell/config.mk b/arch/arm/mach-nexell/config.mk
new file mode 100644
index 0000000000..7b0662699c
--- /dev/null
+++ b/arch/arm/mach-nexell/config.mk
@@ -0,0 +1,11 @@
+#
+# (C) Copyright 2016 Nexell
+# junghyun kim<jhkim@nexell.co.kr>
+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+
+SOCDIR=CPUDIR/$(VENDOR)
+MACHDIR=$(patsubst %,arch/arm/mach-%,$(machine-y))
+
+LDPPFLAGS += -DMACHDIR=$(MACHDIR) -DSOCDIR=$(SOCDIR)
diff --git a/arch/arm/mach-nexell/nx_gpio.c b/arch/arm/mach-nexell/nx_gpio.c
new file mode 100644
index 0000000000..dfba3a2374
--- /dev/null
+++ b/arch/arm/mach-nexell/nx_gpio.c
@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <ybpark@nexell.co.kr>
+ */
+
+/*
+ * FIXME : will be remove after support pinctrl
+ */
+#include <linux/types.h>
+#include <asm/io.h>
+#include <asm/arch/nexell.h>
+#include "asm/arch/nx_gpio.h"
+#define NUMBER_OF_GPIO_MODULE 5
+u32 __g_nx_gpio_valid_bit[NUMBER_OF_GPIO_MODULE] = {
+	0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF};
+
+static struct {
+	struct nx_gpio_register_set *pregister;
+} __g_module_variables[NUMBER_OF_GPIO_MODULE] = {
+	{ (struct nx_gpio_register_set *)PHY_BASEADDR_GPIOA },
+	{ (struct nx_gpio_register_set *)PHY_BASEADDR_GPIOB },
+	{ (struct nx_gpio_register_set *)PHY_BASEADDR_GPIOC },
+	{ (struct nx_gpio_register_set *)PHY_BASEADDR_GPIOD },
+	{ (struct nx_gpio_register_set *)PHY_BASEADDR_GPIOE },
+};
+
+enum { nx_gpio_max_bit = 32 };
+
+void nx_gpio_set_bit(u32 *value, u32 bit, int enable)
+{
+	register u32 newvalue;
+
+	newvalue = *value;
+	newvalue &= ~(1ul << bit);
+	newvalue |= (u32)enable << bit;
+	writel(newvalue, value);
+}
+
+int nx_gpio_get_bit(u32 value, u32 bit)
+{
+	return (int)((value >> bit) & (1ul));
+}
+
+void nx_gpio_set_bit2(u32 *value, u32 bit, u32 bit_value)
+{
+	register u32 newvalue = *value;
+
+	newvalue = (u32)(newvalue & ~(3ul << (bit * 2)));
+	newvalue = (u32)(newvalue | (bit_value << (bit * 2)));
+
+	writel(newvalue, value);
+}
+
+u32 nx_gpio_get_bit2(u32 value, u32 bit)
+{
+	return (u32)((u32)(value >> (bit * 2)) & 3ul);
+}
+
+int nx_gpio_initialize(void)
+{
+	static int binit;
+	u32 i;
+
+	binit = 0;
+
+	if (binit == 0) {
+		for (i = 0; i < NUMBER_OF_GPIO_MODULE; i++)
+			__g_module_variables[i].pregister = NULL;
+		binit = true;
+	}
+	for (i = 0; i < NUMBER_OF_GPIO_MODULE; i++) {
+		__g_nx_gpio_valid_bit[i] = 0xFFFFFFFF;
+	};
+	return true;
+}
+
+u32 nx_gpio_get_number_of_module(void)
+{
+	return NUMBER_OF_GPIO_MODULE;
+}
+
+u32 nx_gpio_get_size_of_register_set(void)
+{
+	return sizeof(struct nx_gpio_register_set);
+}
+
+void nx_gpio_set_base_address(u32 module_index, void *base_address)
+{
+	__g_module_variables[module_index].pregister =
+		(struct nx_gpio_register_set *)base_address;
+}
+
+void *nx_gpio_get_base_address(u32 module_index)
+{
+	return (void *)__g_module_variables[module_index].pregister;
+}
+
+int nx_gpio_open_module(u32 module_index)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	writel(0xFFFFFFFF, &pregister->gpiox_slew_disable_default);
+	writel(0xFFFFFFFF, &pregister->gpiox_drv1_disable_default);
+	writel(0xFFFFFFFF, &pregister->gpiox_drv0_disable_default);
+	writel(0xFFFFFFFF, &pregister->gpiox_pullsel_disable_default);
+	writel(0xFFFFFFFF, &pregister->gpiox_pullenb_disable_default);
+	return true;
+}
+
+int nx_gpio_close_module(u32 module_index) { return true; }
+
+int nx_gpio_check_busy(u32 module_index) { return false; }
+
+void nx_gpio_set_pad_function(u32 module_index, u32 bit_number,
+			      u32 padfunc)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit2(&pregister->gpioxaltfn[bit_number / 16],
+			 bit_number % 16, padfunc);
+}
+
+void nx_gpio_set_pad_function32(u32 module_index, u32 msbvalue, u32 lsbvalue)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	writel(lsbvalue, &pregister->gpioxaltfn[0]);
+	writel(msbvalue, &pregister->gpioxaltfn[1]);
+}
+
+int nx_gpio_get_pad_function(u32 module_index, u32 bit_number)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return (int)nx_gpio_get_bit2
+		(readl(&pregister->gpioxaltfn[bit_number / 16]),
+		 bit_number % 16);
+}
+
+void nx_gpio_set_output_enable(u32 module_index, u32 bit_number,
+			       int output_enb)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit(&pregister->gpioxoutenb, bit_number, output_enb);
+}
+
+int nx_gpio_get_detect_enable(u32 module_index, u32 bit_number)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return nx_gpio_get_bit(readl(&pregister->gpioxdetenb), bit_number);
+}
+
+u32 nx_gpio_get_detect_enable32(u32 module_index)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return readl(&pregister->gpioxdetenb);
+}
+
+void nx_gpio_set_detect_enable(u32 module_index, u32 bit_number,
+			       int detect_enb)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit(&pregister->gpioxdetenb, bit_number, detect_enb);
+}
+
+void nx_gpio_set_detect_enable32(u32 module_index, u32 enable_flag)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	writel(enable_flag, &pregister->gpioxdetenb);
+}
+
+int nx_gpio_get_output_enable(u32 module_index, u32 bit_number)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return nx_gpio_get_bit(readl(&pregister->gpioxoutenb), bit_number);
+}
+
+void nx_gpio_set_output_enable32(u32 module_index, int output_enb)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	if (output_enb)
+		writel(0xFFFFFFFF, &pregister->gpioxoutenb);
+	else
+		writel(0x0, &pregister->gpioxoutenb);
+}
+
+u32 nx_gpio_get_output_enable32(u32 module_index)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return readl(&pregister->gpioxoutenb);
+}
+
+void nx_gpio_set_output_value(u32 module_index, u32 bit_number, int value)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit(&pregister->gpioxout, bit_number, value);
+}
+
+int nx_gpio_get_output_value(u32 module_index, u32 bit_number)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return nx_gpio_get_bit(readl(&pregister->gpioxout), bit_number);
+}
+
+void nx_gpio_set_output_value32(u32 module_index, u32 value)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	writel(value, &pregister->gpioxout);
+}
+
+u32 nx_gpio_get_output_value32(u32 module_index)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return readl(&pregister->gpioxout);
+}
+
+int nx_gpio_get_input_value(u32 module_index, u32 bit_number)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	return nx_gpio_get_bit(readl(&pregister->gpioxpad), bit_number);
+}
+
+void nx_gpio_set_pull_select(u32 module_index, u32 bit_number, int enable)
+{
+	nx_gpio_set_bit(&__g_module_variables[module_index]
+			.pregister->gpiox_pullsel_disable_default,
+			bit_number, true);
+	nx_gpio_set_bit
+		(&__g_module_variables[module_index].pregister->gpiox_pullsel,
+		 bit_number, enable);
+}
+
+void nx_gpio_set_pull_select32(u32 module_index, u32 value)
+{
+	writel(value,
+	       &__g_module_variables[module_index].pregister->gpiox_pullsel);
+}
+
+int nx_gpio_get_pull_select(u32 module_index, u32 bit_number)
+{
+	return nx_gpio_get_bit
+		(__g_module_variables[module_index].pregister->gpiox_pullsel,
+		 bit_number);
+}
+
+u32 nx_gpio_get_pull_select32(u32 module_index)
+{
+	return __g_module_variables[module_index].pregister->gpiox_pullsel;
+}
+
+void nx_gpio_set_pull_mode(u32 module_index, u32 bit_number, u32 mode)
+{
+	nx_gpio_set_bit(&__g_module_variables[module_index]
+			.pregister->gpiox_pullsel_disable_default,
+			bit_number, true);
+	nx_gpio_set_bit(&__g_module_variables[module_index]
+			.pregister->gpiox_pullenb_disable_default,
+			bit_number, true);
+	if (mode == nx_gpio_pull_off) {
+		nx_gpio_set_bit
+		 (&__g_module_variables[module_index].pregister->gpiox_pullenb,
+		 bit_number, false);
+		nx_gpio_set_bit
+		 (&__g_module_variables[module_index].pregister->gpiox_pullsel,
+		 bit_number, false);
+	} else {
+		nx_gpio_set_bit
+		 (&__g_module_variables[module_index].pregister->gpiox_pullsel,
+		 bit_number, (mode & 1 ? true : false));
+		nx_gpio_set_bit
+		 (&__g_module_variables[module_index].pregister->gpiox_pullenb,
+		 bit_number, true);
+	}
+}
+
+void nx_gpio_set_fast_slew(u32 module_index, u32 bit_number,
+			   int enable)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit(&pregister->gpiox_slew, bit_number,
+			(int)(!enable));
+}
+
+void nx_gpio_set_drive_strength(u32 module_index, u32 bit_number,
+				u32 drvstrength)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit(&pregister->gpiox_drv1, bit_number,
+			(int)(((u32)drvstrength >> 0) & 0x1));
+	nx_gpio_set_bit(&pregister->gpiox_drv0, bit_number,
+			(int)(((u32)drvstrength >> 1) & 0x1));
+}
+
+void nx_gpio_set_drive_strength_disable_default(u32 module_index,
+						u32 bit_number, int enable)
+{
+	register struct nx_gpio_register_set *pregister;
+
+	pregister = __g_module_variables[module_index].pregister;
+	nx_gpio_set_bit(&pregister->gpiox_drv1_disable_default, bit_number,
+			(int)(enable));
+	nx_gpio_set_bit(&pregister->gpiox_drv0_disable_default, bit_number,
+			(int)(enable));
+}
+
+u32 nx_gpio_get_drive_strength(u32 module_index, u32 bit_number)
+{
+	register struct nx_gpio_register_set *pregister;
+	register u32 retvalue;
+
+	pregister = __g_module_variables[module_index].pregister;
+	retvalue =
+		nx_gpio_get_bit(readl(&pregister->gpiox_drv0), bit_number) << 1;
+	retvalue |=
+		nx_gpio_get_bit(readl(&pregister->gpiox_drv1), bit_number) << 0;
+	return retvalue;
+}
diff --git a/arch/arm/mach-nexell/nx_sec_reg.c b/arch/arm/mach-nexell/nx_sec_reg.c
new file mode 100644
index 0000000000..3d3dd9fd8b
--- /dev/null
+++ b/arch/arm/mach-nexell/nx_sec_reg.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <park@nexell.co.kr>
+ */
+
+#include <linux/types.h>
+#include <asm/io.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/sec_reg.h>
+#include <linux/linkage.h>
+
+#define NEXELL_SMC_BASE			0x82000000
+
+#define NEXELL_SMC_FN(n)		(NEXELL_SMC_BASE +  (n))
+
+#define NEXELL_SMC_SEC_REG_WRITE	NEXELL_SMC_FN(0x0)
+#define NEXELL_SMC_SEC_REG_READ		NEXELL_SMC_FN(0x1)
+
+#define SECURE_ID_SHIFT			8
+
+#define SEC_4K_OFFSET			((4 * 1024) - 1)
+#define SEC_64K_OFFSET			((64 * 1024) - 1)
+
+asmlinkage int __invoke_nexell_fn_smc(u32, u32, u32, u32);
+
+int write_sec_reg_by_id(void __iomem *reg, int val, int id)
+{
+	int ret = 0;
+	u32 off = 0;
+
+	switch (id) {
+	case NEXELL_L2C_SEC_ID:
+	case NEXELL_MIPI_SEC_ID:
+	case NEXELL_TOFF_SEC_ID:
+		off = (u32)reg & SEC_4K_OFFSET;
+		break;
+	case NEXELL_MALI_SEC_ID:
+		off = (u32)reg & SEC_64K_OFFSET;
+		break;
+	}
+	ret = __invoke_nexell_fn_smc(NEXELL_SMC_SEC_REG_WRITE |
+			((1 << SECURE_ID_SHIFT) + id), off, val, 0);
+	return ret;
+}
+
+int read_sec_reg_by_id(void __iomem *reg, int id)
+{
+	int ret = 0;
+	u32 off = 0;
+
+	switch (id) {
+	case NEXELL_L2C_SEC_ID:
+	case NEXELL_MIPI_SEC_ID:
+	case NEXELL_TOFF_SEC_ID:
+		off = (u32)reg & SEC_4K_OFFSET;
+		break;
+	case NEXELL_MALI_SEC_ID:
+		off = (u32)reg & SEC_64K_OFFSET;
+		break;
+	}
+	ret = __invoke_nexell_fn_smc(NEXELL_SMC_SEC_REG_READ |
+			((1 << SECURE_ID_SHIFT) + id), off, 0, 0);
+	return ret;
+}
+
+int write_sec_reg(void __iomem *reg, int val)
+{
+	int ret = 0;
+
+	ret = __invoke_nexell_fn_smc(NEXELL_SMC_SEC_REG_WRITE,
+				     (u32)reg, val, 0);
+	return ret;
+}
+
+int read_sec_reg(void __iomem *reg)
+{
+	int ret = 0;
+
+	ret = __invoke_nexell_fn_smc(NEXELL_SMC_SEC_REG_READ, (u32)reg, 0, 0);
+	return ret;
+}
diff --git a/arch/arm/mach-nexell/reg-call.S b/arch/arm/mach-nexell/reg-call.S
new file mode 100644
index 0000000000..5fdf51520d
--- /dev/null
+++ b/arch/arm/mach-nexell/reg-call.S
@@ -0,0 +1,23 @@
+#include <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+
+#define ___asm_opcode_identity32(x) ((x) & 0xFFFFFFFF)
+#define __opcode_to_mem_arm(x) ___opcode_identity32(x)
+#define ___asm_opcode_to_mem_arm(x) ___asm_opcode_identity32(x)
+
+#define ___opcode_identity32(x) ((u32)(x))
+#define ___inst_arm(x) .long x
+#define __inst_arm(x) ___inst_arm(___asm_opcode_to_mem_arm(x))
+
+#define __inst_arm_thumb32(arm_opcode, thumb_opcode) __inst_arm(arm_opcode)
+
+#define __SMC(imm4) __inst_arm_thumb32(                                 \
+        0xE1600070 | (((imm4) & 0xF) << 0),                             \
+        0xF7F08000 | (((imm4) & 0xF) << 16)                             \
+)
+
+ENTRY(__invoke_nexell_fn_smc)
+	__SMC(0)
+	bx      lr
+ENDPROC(__invoke_nexell_fn_smc)
diff --git a/arch/arm/mach-nexell/reset.c b/arch/arm/mach-nexell/reset.c
new file mode 100644
index 0000000000..1f732a3d37
--- /dev/null
+++ b/arch/arm/mach-nexell/reset.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <park@nexell.co.kr>
+ */
+
+/*
+ *FIXME : Not support device tree & reset control driver.
+ *        will remove after support device tree & reset control driver.
+ */
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/reset.h>
+
+struct	nx_rstcon_registerset {
+	u32	regrst[(NUMBER_OF_RESET_MODULE_PIN + 31) >> 5];
+};
+
+static struct nx_rstcon_registerset *nx_rstcon =
+			(struct nx_rstcon_registerset *)PHY_BASEADDR_RSTCON;
+
+void nx_rstcon_setrst(u32 rstindex, enum rstcon status)
+{
+	u32 regnum, bitpos, curstat;
+
+	regnum		= rstindex >> 5;
+	curstat		= (u32)readl(&nx_rstcon->regrst[regnum]);
+	bitpos		= rstindex & 0x1f;
+	curstat		&= ~(1UL << bitpos);
+	curstat		|= (status & 0x01) << bitpos;
+	writel(curstat, &nx_rstcon->regrst[regnum]);
+}
diff --git a/arch/arm/mach-nexell/tieoff.c b/arch/arm/mach-nexell/tieoff.c
new file mode 100644
index 0000000000..5a4744c296
--- /dev/null
+++ b/arch/arm/mach-nexell/tieoff.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <park@nexell.co.kr>
+ */
+
+#include <common.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/reset.h>
+#include <asm/arch/nx_gpio.h>
+#include <asm/arch/tieoff.h>
+#include <asm/arch/sec_reg.h>
+
+#define	NX_PIN_FN_SIZE	4
+#define TIEOFF_REG_NUM 33
+
+struct	nx_tieoff_registerset {
+	u32	tieoffreg[TIEOFF_REG_NUM];
+};
+
+static struct nx_tieoff_registerset *nx_tieoff = (void *)PHY_BASEADDR_TIEOFF;
+
+static int tieoff_readl(void __iomem *reg)
+{
+	if (IS_ENABLED(CONFIG_ARCH_S5P4418))
+		return read_sec_reg_by_id(reg, NEXELL_TOFF_SEC_ID);
+	else
+		return readl(reg);
+}
+
+static int  tieoff_writetl(void __iomem *reg, int val)
+{
+	if (IS_ENABLED(CONFIG_ARCH_S5P4418))
+		return write_sec_reg_by_id(reg, val, NEXELL_TOFF_SEC_ID);
+	else
+		return writel(val, reg);
+}
+
+void nx_tieoff_set(u32 tieoff_index, u32 tieoff_value)
+{
+	u32 regindex, mask;
+	u32 lsb, msb;
+	u32 regval;
+
+	u32 position;
+	u32 bitwidth;
+
+	position = tieoff_index & 0xffff;
+	bitwidth = (tieoff_index >> 16) & 0xffff;
+
+	regindex	= position >> 5;
+
+	lsb = position & 0x1F;
+	msb = lsb + bitwidth;
+
+	if (msb > 32) {
+		msb &= 0x1F;
+		mask   = ~(0xffffffff << lsb);
+		regval = tieoff_readl(&nx_tieoff->tieoffreg[regindex]) & mask;
+		regval |= ((tieoff_value & ((1UL << bitwidth) - 1)) << lsb);
+		tieoff_writetl(&nx_tieoff->tieoffreg[regindex], regval);
+
+		mask   = (0xffffffff << msb);
+		regval = tieoff_readl(&nx_tieoff->tieoffreg[regindex]) & mask;
+		regval |= ((tieoff_value & ((1UL << bitwidth) - 1)) >> msb);
+		tieoff_writetl(&nx_tieoff->tieoffreg[regindex + 1], regval);
+	} else	{
+		mask	= (0xffffffff << msb) | (~(0xffffffff << lsb));
+		regval = tieoff_readl(&nx_tieoff->tieoffreg[regindex]) & mask;
+		regval	|= ((tieoff_value & ((1UL << bitwidth) - 1)) << lsb);
+		tieoff_writetl(&nx_tieoff->tieoffreg[regindex], regval);
+	}
+}
+
+u32 nx_tieoff_get(u32 tieoff_index)
+{
+	u32 regindex, mask;
+	u32 lsb, msb;
+	u32 regval;
+
+	u32 position;
+	u32 bitwidth;
+
+	position = tieoff_index & 0xffff;
+	bitwidth = (tieoff_index >> 16) & 0xffff;
+
+	regindex = position / 32;
+	lsb = position % 32;
+	msb = lsb + bitwidth;
+
+	if (msb > 32) {
+		msb &= 0x1F;
+		mask   = 0xffffffff << lsb;
+		regval = tieoff_readl(&nx_tieoff->tieoffreg[regindex]) & mask;
+		regval >>= lsb;
+
+		mask   = ~(0xffffffff << msb);
+		regval |= ((tieoff_readl(&nx_tieoff->tieoffreg[regindex + 1])
+					& mask) << (32 - lsb));
+	} else	{
+		mask   = ~(0xffffffff << msb) & (0xffffffff << lsb);
+		regval = tieoff_readl(&nx_tieoff->tieoffreg[regindex]) & mask;
+		regval >>= lsb;
+	}
+	return regval;
+}
diff --git a/arch/arm/mach-nexell/timer.c b/arch/arm/mach-nexell/timer.c
new file mode 100644
index 0000000000..fecee67265
--- /dev/null
+++ b/arch/arm/mach-nexell/timer.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Hyunseok, Jung <hsjung@nexell.co.kr>
+ */
+
+#include <common.h>
+#include <log.h>
+
+#include <asm/io.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/clk.h>
+#if defined(CONFIG_ARCH_S5P4418)
+#include <asm/arch/reset.h>
+#endif
+
+#if (CONFIG_TIMER_SYS_TICK_CH > 3)
+#error Not support timer channel. Please use "0~3" channels.
+#endif
+
+/* global variables to save timer count
+ *
+ * Section ".data" must be used because BSS is not available before relocation,
+ * in board_init_f(), respectively! I.e. global variables can not be used!
+ */
+static unsigned long timestamp __attribute__ ((section(".data")));
+static unsigned long lastdec __attribute__ ((section(".data")));
+static int	timerinit __attribute__ ((section(".data")));
+
+/* macro to hw timer tick config */
+static long	TIMER_FREQ  = 1000000;
+static long	TIMER_HZ    = 1000000 / CONFIG_SYS_HZ;
+static long	TIMER_COUNT = 0xFFFFFFFF;
+
+#define	REG_TCFG0			(0x00)
+#define	REG_TCFG1			(0x04)
+#define	REG_TCON			(0x08)
+#define	REG_TCNTB0			(0x0C)
+#define	REG_TCMPB0			(0x10)
+#define	REG_TCNT0			(0x14)
+#define	REG_CSTAT			(0x44)
+
+#define	TCON_BIT_AUTO			(1 << 3)
+#define	TCON_BIT_INVT			(1 << 2)
+#define	TCON_BIT_UP			(1 << 1)
+#define	TCON_BIT_RUN			(1 << 0)
+#define TCFG0_BIT_CH(ch)		((ch) == 0 || (ch) == 1 ? 0 : 8)
+#define TCFG1_BIT_CH(ch)		((ch) * 4)
+#define TCON_BIT_CH(ch)			((ch) ? (ch) * 4  + 4 : 0)
+#define TINT_CH(ch)			(ch)
+#define TINT_CSTAT_BIT_CH(ch)		((ch) + 5)
+#define	TINT_CSTAT_MASK			(0x1F)
+#define TIMER_TCNT_OFFS			(0xC)
+
+void reset_timer_masked(void);
+unsigned long get_timer_masked(void);
+
+/*
+ * Timer HW
+ */
+static inline void timer_clock(void __iomem *base, int ch, int mux, int scl)
+{
+	u32 val = readl(base + REG_TCFG0) & ~(0xFF << TCFG0_BIT_CH(ch));
+
+	writel(val | ((scl - 1) << TCFG0_BIT_CH(ch)), base + REG_TCFG0);
+	val = readl(base + REG_TCFG1) & ~(0xF << TCFG1_BIT_CH(ch));
+	writel(val | (mux << TCFG1_BIT_CH(ch)), base + REG_TCFG1);
+}
+
+static inline void timer_count(void __iomem *base, int ch, unsigned int cnt)
+{
+	writel((cnt - 1), base + REG_TCNTB0 + (TIMER_TCNT_OFFS * ch));
+	writel((cnt - 1), base + REG_TCMPB0 + (TIMER_TCNT_OFFS * ch));
+}
+
+static inline void timer_start(void __iomem *base, int ch)
+{
+	int on = 0;
+	u32 val = readl(base + REG_CSTAT) & ~(TINT_CSTAT_MASK << 5 | 0x1 << ch);
+
+	writel(val | (0x1 << TINT_CSTAT_BIT_CH(ch) | on << ch),
+	       base + REG_CSTAT);
+	val = readl(base + REG_TCON) & ~(0xE << TCON_BIT_CH(ch));
+	writel(val | (TCON_BIT_UP << TCON_BIT_CH(ch)), base + REG_TCON);
+
+	val &= ~(TCON_BIT_UP << TCON_BIT_CH(ch));
+	val |= ((TCON_BIT_AUTO | TCON_BIT_RUN) << TCON_BIT_CH(ch));
+	writel(val, base + REG_TCON);
+	dmb();
+}
+
+static inline void timer_stop(void __iomem *base, int ch)
+{
+	int on = 0;
+	u32 val = readl(base + REG_CSTAT) & ~(TINT_CSTAT_MASK << 5 | 0x1 << ch);
+
+	writel(val | (0x1 << TINT_CSTAT_BIT_CH(ch) | on << ch),
+	       base + REG_CSTAT);
+	val = readl(base + REG_TCON) & ~(TCON_BIT_RUN << TCON_BIT_CH(ch));
+	writel(val, base + REG_TCON);
+}
+
+static inline unsigned long timer_read(void __iomem *base, int ch)
+{
+	unsigned long ret;
+
+	ret = TIMER_COUNT - readl(base + REG_TCNT0 + (TIMER_TCNT_OFFS * ch));
+	return ret;
+}
+
+int timer_init(void)
+{
+	struct clk *clk = NULL;
+	char name[16] = "pclk";
+	int ch = CONFIG_TIMER_SYS_TICK_CH;
+	unsigned long rate, tclk = 0;
+	unsigned long mout, thz, cmp = -1UL;
+	int tcnt, tscl = 0, tmux = 0;
+	int mux = 0, scl = 0;
+	void __iomem *base = (void __iomem *)PHY_BASEADDR_TIMER;
+
+	if (timerinit)
+		return 0;
+
+	/* get with PCLK */
+	clk  = clk_get(name);
+	rate = clk_get_rate(clk);
+	for (mux = 0; mux < 5; mux++) {
+		mout = rate / (1 << mux), scl = mout / TIMER_FREQ,
+		thz = mout / scl;
+		if (!(mout % TIMER_FREQ) && 256 > scl) {
+			tclk = thz, tmux = mux, tscl = scl;
+			break;
+		}
+		if (scl > 256)
+			continue;
+		if (abs(thz - TIMER_FREQ) >= cmp)
+			continue;
+		tclk = thz, tmux = mux, tscl = scl;
+		cmp = abs(thz - TIMER_FREQ);
+	}
+	tcnt = tclk;	/* Timer Count := 1 Mhz counting */
+
+	TIMER_FREQ = tcnt;	/* Timer Count := 1 Mhz counting */
+	TIMER_HZ = TIMER_FREQ / CONFIG_SYS_HZ;
+	tcnt = TIMER_COUNT == 0xFFFFFFFF ? TIMER_COUNT + 1 : tcnt;
+
+	timer_stop(base, ch);
+	timer_clock(base, ch, tmux, tscl);
+	timer_count(base, ch, tcnt);
+	timer_start(base, ch);
+
+	reset_timer_masked();
+	timerinit = 1;
+
+	return 0;
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+unsigned long get_timer(unsigned long base)
+{
+	long ret;
+	unsigned long time = get_timer_masked();
+	unsigned long hz = TIMER_HZ;
+
+	ret = time / hz - base;
+	return ret;
+}
+
+void set_timer(unsigned long t)
+{
+	timestamp = (unsigned long)t;
+}
+
+void reset_timer_masked(void)
+{
+	void __iomem *base = (void __iomem *)PHY_BASEADDR_TIMER;
+	int ch = CONFIG_TIMER_SYS_TICK_CH;
+
+	/* reset time */
+	/* capure current decrementer value time */
+	lastdec = timer_read(base, ch);
+	/* start "advancing" time stamp from 0 */
+	timestamp = 0;
+}
+
+unsigned long get_timer_masked(void)
+{
+	void __iomem *base = (void __iomem *)PHY_BASEADDR_TIMER;
+	int ch = CONFIG_TIMER_SYS_TICK_CH;
+
+	unsigned long now = timer_read(base, ch); /* current tick value */
+
+	if (now >= lastdec) {			  /* normal mode (non roll) */
+		/* move stamp fordward with absolute diff ticks */
+		timestamp += now - lastdec;
+	} else {
+		/* we have overflow of the count down timer */
+		/* nts = ts + ld + (TLV - now)
+		 * ts=old stamp, ld=time that passed before passing through -1
+		 * (TLV-now) amount of time after passing though -1
+		 * nts = new "advancing time stamp"...
+		 * it could also roll and cause problems.
+		 */
+		timestamp += now + TIMER_COUNT - lastdec;
+	}
+	/* save last */
+	lastdec = now;
+
+	debug("now=%lu, last=%lu, timestamp=%lu\n", now, lastdec, timestamp);
+	return (unsigned long)timestamp;
+}
+
+void __udelay(unsigned long usec)
+{
+	unsigned long tmo, tmp;
+
+	debug("+udelay=%ld\n", usec);
+
+	if (!timerinit)
+		timer_init();
+
+	/* if "big" number, spread normalization to seconds */
+	if (usec >= 1000) {
+		/* start to normalize for usec to ticks per sec */
+		tmo  = usec / 1000;
+		/* find number of "ticks" to wait to achieve target */
+		tmo *= TIMER_FREQ;
+		/* finish normalize. */
+		tmo /= 1000;
+	/* else small number, don't kill it prior to HZ multiply */
+	} else {
+		tmo = usec * TIMER_FREQ;
+		tmo /= (1000 * 1000);
+	}
+
+	tmp = get_timer_masked();	/* get current timestamp */
+	debug("A. tmo=%ld, tmp=%ld\n", tmo, tmp);
+
+	/* if setting this fordward will roll time stamp */
+	if (tmp > (tmo + tmp + 1))
+		/* reset "advancing" timestamp to 0, set lastdec value */
+		reset_timer_masked();
+	else
+		/* set advancing stamp wake up time */
+		tmo += tmp;
+
+	debug("B. tmo=%ld, tmp=%ld\n", tmo, tmp);
+
+	/* loop till event */
+	do {
+		tmp = get_timer_masked();
+	} while (tmo > tmp);
+	debug("-udelay=%ld\n", usec);
+}
+
+void udelay_masked(unsigned long usec)
+{
+	unsigned long tmo, endtime;
+	signed long diff;
+
+	/* if "big" number, spread normalization to seconds */
+	if (usec >= 1000) {
+		/* start to normalize for usec to ticks per sec */
+		tmo = usec / 1000;
+		/* find number of "ticks" to wait to achieve target */
+		tmo *= TIMER_FREQ;
+		/* finish normalize. */
+		tmo /= 1000;
+	} else { /* else small number, don't kill it prior to HZ multiply */
+		tmo = usec * TIMER_FREQ;
+		tmo /= (1000 * 1000);
+	}
+
+	endtime = get_timer_masked() + tmo;
+
+	do {
+		unsigned long now = get_timer_masked();
+
+		diff = endtime - now;
+	} while (diff >= 0);
+}
+
+unsigned long long get_ticks(void)
+{
+	return get_timer_masked();
+}
+
+#if defined(CONFIG_ARCH_S5P4418)
+ulong get_tbclk(void)
+{
+	ulong  tbclk = TIMER_FREQ;
+	return tbclk;
+}
+#endif