arm: add support for SoC s5p4418 (cpu) / nanopi2 board

Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- SPL not supported yet --> no spl-dir in arch/arm/cpu/armv7/s5p4418/.
  Appropriate line in Makefile removed.
- cpu.c: '#include <cpu_func.h>' added.
- arch/arm/cpu/armv7/s5p4418/u-boot.lds removed, is not required
  anylonger.
- "obj-$(CONFIG_ARCH_NEXELL) += s5p-common/" added to
  arch/arm/cpu/armv7/Makefile since s5p-common/pwm.c is used instead
  of drivers/pwm/pwm-nexell.c.
- s5p4418.dtsi: '#include "../../../include/generated/autoconf.h"'
  removed, is not necessary, error at out-of-tree building.
  '#ifdef CONFIG_CPU_NXP4330'-blocks (2x) removed. Some minor changes
  regarding mmc. 'u-boot,dm-pre-reloc' added to dp0 because of added
  DM_VIDEO support.
- board/s5p4418/ renamed to board/friendlyarm/
- All s5p4418-boards except nanopi2 removed because there is no
  possibility to test the other boards.
- Kconfig: Changes to have a structure like mach-bcm283x (RaspberryPi),
  e.g. "config ..." entries moved from/to other Kconfig.
- "CONFIG_" removed from several s5p4418/nanopi2 specific defines
  because the appropriate values do not need to be configurable.
- nanopi2/board.c: All getenv(), getenv_ulong(), setenv() and saveenv()
  renamed to env_get(), env_get_ulong(), env_set() and env_save(),
  respectively. MACH_TYPE_S5P4418 is not defined anymore, therefore
  appropriate code removed (not necessary for DT-kernels).
- nanopi2/onewire.c: All crc8() renamed to crc8_ow() because crc8() is
  already defined in lib/crc8.c (with different parameters).
- dts: "nexell,s5pxx18-i2c" used instead of "i2c-gpio", i2c0 and
  i2c1 added. gmac-, ehci- and dwc2otg-entries removed because the
  appropriate functionality is not supported yet. New mmc-property
  "mmcboost" added.
  s5p4418-pinctrl.dtsi: gmac-entries removed, mmc- and i2c-entries
  added.
- '#ifdef CONFIG...' changed to 'if (IS_ENABLED(CONFIG...))' where
  possible (and similar).

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

3 files changed, 129 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 8c955d0d52..0e83e394d5 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -42,3 +42,5 @@ obj-$(CONFIG_RMOBILE) += rmobile/
 obj-$(if $(filter stv0991,$(SOC)),y) += stv0991/
 obj-$(CONFIG_ARCH_SUNXI) += sunxi/
 obj-$(CONFIG_VF610) += vf610/
+obj-$(CONFIG_ARCH_S5P4418) += s5p4418/
+obj-$(CONFIG_ARCH_NEXELL) += s5p-common/
diff --git a/arch/arm/cpu/armv7/s5p4418/Makefile b/arch/arm/cpu/armv7/s5p4418/Makefile
new file mode 100644
index 0000000000..321b257b6d
--- /dev/null
+++ b/arch/arm/cpu/armv7/s5p4418/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2016 Nexell
+# Hyunseok, Jung <hsjung@nexell.co.kr>
+
+obj-y += cpu.o
diff --git a/arch/arm/cpu/armv7/s5p4418/cpu.c b/arch/arm/cpu/armv7/s5p4418/cpu.c
new file mode 100644
index 0000000000..8add9474ad
--- /dev/null
+++ b/arch/arm/cpu/armv7/s5p4418/cpu.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Hyunseok, Jung <hsjung@nexell.co.kr>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/system.h>
+#include <asm/cache.h>
+#include <asm/sections.h>
+#include <asm/io.h>
+#include <asm/arch/nexell.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/reset.h>
+#include <asm/arch/tieoff.h>
+#include <cpu_func.h>
+#include <linux/delay.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifndef	CONFIG_ARCH_CPU_INIT
+#error must be define the macro "CONFIG_ARCH_CPU_INIT"
+#endif
+
+void s_init(void)
+{
+}
+
+static void cpu_soc_init(void)
+{
+	/*
+	 * NOTE> ALIVE Power Gate must enable for Alive register access.
+	 *	     must be clear wfi jump address
+	 */
+	writel(1, ALIVEPWRGATEREG);
+	writel(0xFFFFFFFF, SCR_ARM_SECOND_BOOT);
+
+	/* write 0xf0 on alive scratchpad reg for boot success check */
+	writel(readl(SCR_SIGNAGURE_READ) | 0xF0, (SCR_SIGNAGURE_SET));
+
+	/* set l2 cache tieoff */
+	nx_tieoff_set(NX_TIEOFF_CORTEXA9MP_TOP_QUADL2C_L2RET1N_0, 1);
+	nx_tieoff_set(NX_TIEOFF_CORTEXA9MP_TOP_QUADL2C_L2RET1N_1, 1);
+}
+
+#ifdef CONFIG_PL011_SERIAL
+static void serial_device_init(void)
+{
+	char dev[10];
+	int id;
+
+	sprintf(dev, "nx-uart.%d", CONFIG_CONS_INDEX);
+	id = RESET_ID_UART0 + CONFIG_CONS_INDEX;
+
+	struct clk *clk = clk_get((const char *)dev);
+
+	/* reset control: Low active ___|---   */
+	nx_rstcon_setrst(id, RSTCON_ASSERT);
+	udelay(10);
+	nx_rstcon_setrst(id, RSTCON_NEGATE);
+	udelay(10);
+
+	/* set clock   */
+	clk_disable(clk);
+	clk_set_rate(clk, CONFIG_PL011_CLOCK);
+	clk_enable(clk);
+}
+#endif
+
+int arch_cpu_init(void)
+{
+	flush_dcache_all();
+	cpu_soc_init();
+	clk_init();
+
+	if (IS_ENABLED(CONFIG_PL011_SERIAL))
+		serial_device_init();
+
+	return 0;
+}
+
+#if defined(CONFIG_DISPLAY_CPUINFO)
+int print_cpuinfo(void)
+{
+	return 0;
+}
+#endif
+
+void reset_cpu(ulong ignored)
+{
+	void *clkpwr_reg = (void *)PHY_BASEADDR_CLKPWR;
+	const u32 sw_rst_enb_bitpos = 3;
+	const u32 sw_rst_enb_mask = 1 << sw_rst_enb_bitpos;
+	const u32 sw_rst_bitpos = 12;
+	const u32 sw_rst_mask = 1 << sw_rst_bitpos;
+	int pwrcont = 0x224;
+	int pwrmode = 0x228;
+	u32 read_value;
+
+	read_value = readl((void *)(clkpwr_reg + pwrcont));
+
+	read_value &= ~sw_rst_enb_mask;
+	read_value |= 1 << sw_rst_enb_bitpos;
+
+	writel(read_value, (void *)(clkpwr_reg + pwrcont));
+	writel(sw_rst_mask, (void *)(clkpwr_reg + pwrmode));
+}
+
+void enable_caches(void)
+{
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+
+#if defined(CONFIG_ARCH_MISC_INIT)
+int arch_misc_init(void)
+{
+	return 0;
+}
+#endif	/* CONFIG_ARCH_MISC_INIT */