ARM: am335x: Add support for chiliSOM

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

Hardware specification:
 * TI AM335x processor
 * 128M, 256M or 512M DDR3 memory
 * up to 256M NAND

We place source inside arch/arm/mach-omap2/ directory and make it
possible to reuse initialization code (i.e. DDR, NAND init) for all
boards that use it.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/include/asm/arch-am33xx/chilisom.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2017 Grinn
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ARCH_ARM_MACH_CHILISOM_SOM_H__
+#define __ARCH_ARM_MACH_CHILISOM_SOM_H__
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+void chilisom_enable_pin_mux(void);
+void chilisom_spl_board_init(void);
+#endif
+
+#endif

arch/arm/mach-omap2/am33xx/Kconfig

@@ -1,5 +1,9 @@
 if AM33XX
 
+config AM33XX_CHILISOM
+	bool
+	select SUPPORT_SPL
+
 choice
 	prompt "AM33xx board select"
 	optional

arch/arm/mach-omap2/am33xx/Makefile

@@ -20,3 +20,5 @@ obj-y	+= board.o
 obj-y	+= mux.o
 
 obj-$(CONFIG_CLOCK_SYNTHESIZER)	+= clk_synthesizer.o
+
+obj-$(CONFIG_AM33XX_CHILISOM) += chilisom.o

arch/arm/mach-omap2/am33xx/chilisom.c

@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ * Copyright (C) 2017, Grinn - http://grinn-global.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/clk_synthesizer.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/ddr_defs.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/omap.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/mux.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/emif.h>
+#include <asm/io.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/tps65217.h>
+#include <spl.h>
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+
+static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
+
+static struct module_pin_mux i2c0_pin_mux[] = {
+	{OFFSET(i2c0_sda), (MODE(0) | RXACTIVE |
+			PULLUDEN | SLEWCTRL)}, /* I2C_DATA */
+	{OFFSET(i2c0_scl), (MODE(0) | RXACTIVE |
+			PULLUDEN | SLEWCTRL)}, /* I2C_SCLK */
+	{-1},
+};
+
+static struct module_pin_mux nand_pin_mux[] = {
+	{OFFSET(gpmc_ad0), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD0 */
+	{OFFSET(gpmc_ad1), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD1 */
+	{OFFSET(gpmc_ad2), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD2 */
+	{OFFSET(gpmc_ad3), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD3 */
+	{OFFSET(gpmc_ad4), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD4 */
+	{OFFSET(gpmc_ad5), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD5 */
+	{OFFSET(gpmc_ad6), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD6 */
+	{OFFSET(gpmc_ad7), (MODE(0) | PULLUP_EN | RXACTIVE)},	/* NAND AD7 */
+	{OFFSET(gpmc_wait0), (MODE(0) | RXACTIVE | PULLUP_EN)}, /* NAND WAIT */
+	{OFFSET(gpmc_wpn), (MODE(7) | PULLUP_EN | RXACTIVE)},	/* NAND_WPN */
+	{OFFSET(gpmc_csn0), (MODE(0) | PULLUDEN)},	/* NAND_CS0 */
+	{OFFSET(gpmc_advn_ale), (MODE(0) | PULLUDEN)}, /* NAND_ADV_ALE */
+	{OFFSET(gpmc_oen_ren), (MODE(0) | PULLUDEN)},	/* NAND_OE */
+	{OFFSET(gpmc_wen), (MODE(0) | PULLUDEN)},	/* NAND_WEN */
+	{OFFSET(gpmc_be0n_cle), (MODE(0) | PULLUDEN)},	/* NAND_BE_CLE */
+	{-1},
+};
+
+static void enable_i2c0_pin_mux(void)
+{
+	configure_module_pin_mux(i2c0_pin_mux);
+}
+
+void chilisom_enable_pin_mux(void)
+{
+	/* chilisom pin mux */
+	configure_module_pin_mux(nand_pin_mux);
+}
+
+static const struct ddr_data ddr3_chilisom_data = {
+	.datardsratio0 = MT41K256M16HA125E_RD_DQS,
+	.datawdsratio0 = MT41K256M16HA125E_WR_DQS,
+	.datafwsratio0 = MT41K256M16HA125E_PHY_FIFO_WE,
+	.datawrsratio0 = MT41K256M16HA125E_PHY_WR_DATA,
+};
+
+static const struct cmd_control ddr3_chilisom_cmd_ctrl_data = {
+	.cmd0csratio = MT41K256M16HA125E_RATIO,
+	.cmd0iclkout = MT41K256M16HA125E_INVERT_CLKOUT,
+
+	.cmd1csratio = MT41K256M16HA125E_RATIO,
+	.cmd1iclkout = MT41K256M16HA125E_INVERT_CLKOUT,
+
+	.cmd2csratio = MT41K256M16HA125E_RATIO,
+	.cmd2iclkout = MT41K256M16HA125E_INVERT_CLKOUT,
+};
+
+static struct emif_regs ddr3_chilisom_emif_reg_data = {
+	.sdram_config = MT41K256M16HA125E_EMIF_SDCFG,
+	.ref_ctrl = MT41K256M16HA125E_EMIF_SDREF,
+	.sdram_tim1 = MT41K256M16HA125E_EMIF_TIM1,
+	.sdram_tim2 = MT41K256M16HA125E_EMIF_TIM2,
+	.sdram_tim3 = MT41K256M16HA125E_EMIF_TIM3,
+	.ocp_config = 0x00141414,
+	.zq_config = MT41K256M16HA125E_ZQ_CFG,
+	.emif_ddr_phy_ctlr_1 = MT41K256M16HA125E_EMIF_READ_LATENCY,
+};
+
+void chilisom_spl_board_init(void)
+{
+	int mpu_vdd;
+	int usb_cur_lim;
+
+	enable_i2c0_pin_mux();
+
+	/* Get the frequency */
+	dpll_mpu_opp100.m = am335x_get_efuse_mpu_max_freq(cdev);
+
+
+	if (i2c_probe(TPS65217_CHIP_PM))
+		return;
+
+	/*
+	 * Increase USB current limit to 1300mA or 1800mA and set
+	 * the MPU voltage controller as needed.
+	 */
+	if (dpll_mpu_opp100.m == MPUPLL_M_1000) {
+		usb_cur_lim = TPS65217_USB_INPUT_CUR_LIMIT_1800MA;
+		mpu_vdd = TPS65217_DCDC_VOLT_SEL_1325MV;
+	} else {
+		usb_cur_lim = TPS65217_USB_INPUT_CUR_LIMIT_1300MA;
+		mpu_vdd = TPS65217_DCDC_VOLT_SEL_1275MV;
+	}
+
+	if (tps65217_reg_write(TPS65217_PROT_LEVEL_NONE,
+			       TPS65217_POWER_PATH,
+			       usb_cur_lim,
+			       TPS65217_USB_INPUT_CUR_LIMIT_MASK))
+		puts("tps65217_reg_write failure\n");
+
+	/* Set DCDC3 (CORE) voltage to 1.125V */
+	if (tps65217_voltage_update(TPS65217_DEFDCDC3,
+				    TPS65217_DCDC_VOLT_SEL_1125MV)) {
+		puts("tps65217_voltage_update failure\n");
+		return;
+	}
+	/* Set CORE Frequencies to OPP100 */
+	do_setup_dpll(&dpll_core_regs, &dpll_core_opp100);
+
+	/* Set DCDC2 (MPU) voltage */
+	if (tps65217_voltage_update(TPS65217_DEFDCDC2, mpu_vdd)) {
+		puts("tps65217_voltage_update failure\n");
+		return;
+	}
+
+	/* Set LDO3 to 1.8V and LDO4 to 3.3V */
+	if (tps65217_reg_write(TPS65217_PROT_LEVEL_2,
+			       TPS65217_DEFLS1,
+			       TPS65217_LDO_VOLTAGE_OUT_1_8,
+			       TPS65217_LDO_MASK))
+		puts("tps65217_reg_write failure\n");
+
+	if (tps65217_reg_write(TPS65217_PROT_LEVEL_2,
+			       TPS65217_DEFLS2,
+			       TPS65217_LDO_VOLTAGE_OUT_3_3,
+			       TPS65217_LDO_MASK))
+		puts("tps65217_reg_write failure\n");
+
+	/* Set MPU Frequency to what we detected now that voltages are set */
+	do_setup_dpll(&dpll_mpu_regs, &dpll_mpu_opp100);
+}
+
+#define OSC	(V_OSCK/1000000)
+const struct dpll_params dpll_ddr_chilisom = {
+		400, OSC-1, 1, -1, -1, -1, -1};
+
+const struct dpll_params *get_dpll_ddr_params(void)
+{
+	return &dpll_ddr_chilisom;
+}
+
+const struct ctrl_ioregs ioregs_chilisom = {
+	.cm0ioctl		= MT41K256M16HA125E_IOCTRL_VALUE,
+	.cm1ioctl		= MT41K256M16HA125E_IOCTRL_VALUE,
+	.cm2ioctl		= MT41K256M16HA125E_IOCTRL_VALUE,
+	.dt0ioctl		= MT41K256M16HA125E_IOCTRL_VALUE,
+	.dt1ioctl		= MT41K256M16HA125E_IOCTRL_VALUE,
+};
+
+void sdram_init(void)
+{
+	config_ddr(400, &ioregs_chilisom,
+		   &ddr3_chilisom_data,
+		   &ddr3_chilisom_cmd_ctrl_data,
+		   &ddr3_chilisom_emif_reg_data, 0);
+}
+
+#endif /* CONFIG_SKIP_LOWLEVEL_INIT */