power: Add support for the TPS65218 PMIC

Add a driver for the TPS65218 PMIC which is used by TI AM43xx SoCs and
may be used by TI AM335x SoCs.

Signed-off-by: Tom Rini <trini@ti.com>

drivers/power/pmic/Makefile

@@ -13,4 +13,5 @@ obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
 obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
 obj-$(CONFIG_POWER_TPS65090) += pmic_tps65090.o
 obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
+obj-$(CONFIG_POWER_TPS65218) += pmic_tps65218.o
 obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o

drivers/power/pmic/pmic_tps65218.c

@@ -0,0 +1,97 @@
+/*
+ * (C) Copyright 2011-2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <power/tps65218.h>
+
+/**
+ *  tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
+ *			   register or bit field regardless of protection
+ *			   level.
+ *
+ *  @prot_level:	   Register password protection.  Use
+ *			   TPS65218_PROT_LEVEL_NONE,
+ *			   TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
+ *  @dest_reg:		   Register address to write.
+ *  @dest_val:		   Value to write.
+ *  @mask:		   Bit mask (8 bits) to be applied.  Function will only
+ *			   change bits that are set in the bit mask.
+ *
+ *  @return:		   0 for success, not 0 on failure, as per the i2c API
+ */
+int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
+		       uchar mask)
+{
+	uchar read_val;
+	uchar xor_reg;
+	int ret;
+
+	/*
+	 * If we are affecting only a bit field, read dest_reg and apply the
+	 * mask
+	 */
+	if (mask != TPS65218_MASK_ALL_BITS) {
+		ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
+		if (ret)
+			return ret;
+		read_val &= (~mask);
+		read_val |= (dest_val & mask);
+		dest_val = read_val;
+	}
+
+	if (prot_level > 0) {
+		xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
+		ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
+				&xor_reg, 1);
+		if (ret)
+			return ret;
+	}
+
+	ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
+	if (ret)
+		return ret;
+
+	if (prot_level == TPS65218_PROT_LEVEL_2) {
+		ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
+				&xor_reg, 1);
+		if (ret)
+			return ret;
+
+		ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * tps65218_voltage_update() - Function to change a voltage level, as this
+ *			       is a multi-step process.
+ * @dc_cntrl_reg:	       DC voltage control register to change.
+ * @volt_sel:		       New value for the voltage register
+ * @return:		       0 for success, not 0 on failure.
+ */
+int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
+{
+	if ((dc_cntrl_reg != TPS65218_DCDC1) &&
+	    (dc_cntrl_reg != TPS65218_DCDC2))
+		return 1;
+
+	/* set voltage level */
+	if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
+			       TPS65218_MASK_ALL_BITS))
+		return 1;
+
+	/* set GO bit to initiate voltage transition */
+	if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
+			       TPS65218_DCDC_GO, TPS65218_DCDC_GO))
+		return 1;
+
+	return 0;
+}

include/power/tps65218.h

@@ -0,0 +1,63 @@
+/*
+ * (C) Copyright 2014
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __POWER_TPS65218_H__
+#define __POWER_TPS65218_H__
+
+/* I2C chip address */
+#define TPS65218_CHIP_PM			0x24
+
+/* Registers */
+enum {
+	TPS65218_CHIPID				= 0x00,
+	TPS65218_INT1,
+	TPS65218_INT2,
+	TPS65218_INT_MASK1,
+	TPS65218_INT_MASK2,
+	TPS65218_STATUS,
+	TPS65218_CONTROL,
+	TPS65218_FLAG,
+	TPS65218_PASSWORD			= 0x10,
+	TPS65218_ENABLE1,
+	TPS65218_ENABLE2,
+	TPS65218_CONFIG1,
+	TPS65218_CONFIG2,
+	TPS65218_CONFIG3,
+	TPS65218_DCDC1,
+	TPS65218_DCDC2,
+	TPS65218_DCDC3,
+	TPS65218_DCDC4,
+	TPS65218_SLEW,
+	TPS65218_LDO1,
+	TPS65218_SEQ1				= 0x20,
+	TPS65218_SEQ2,
+	TPS65218_SEQ3,
+	TPS65218_SEQ4,
+	TPS65218_SEQ5,
+	TPS65218_SEQ6,
+	TPS65218_SEQ7,
+	TPS65218_PMIC_NUM_OF_REGS,
+};
+
+#define TPS65218_PROT_LEVEL_NONE		0x00
+#define TPS65218_PROT_LEVEL_1			0x01
+#define TPS65218_PROT_LEVEL_2			0x02
+
+#define TPS65218_PASSWORD_LOCK_FOR_WRITE	0x00
+#define TPS65218_PASSWORD_UNLOCK		0x7D
+
+#define TPS65218_DCDC_GO			0x80
+
+#define TPS65218_MASK_ALL_BITS			0xFF
+
+#define TPS65218_DCDC_VOLT_SEL_1100MV		0x19
+#define TPS65218_DCDC_VOLT_SEL_1330MV		0x30
+
+int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
+		       uchar mask);
+int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel);
+#endif	/* __POWER_TPS65218_H__ */