am33xx: pmic: Add support for tps65217

This is mostly copied from "support for TPS65217 PMIC" patches from the
old am33xx U-boot tree by Greg Guyyote with additions by Tom Rini, me
and others.

[trini: Remove the change that ...
Also drop DDR3 voltage level from 1.5V to 1.35V for beaglebone. DDR3
operation is verified at this lower voltage level.]

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>

3 files changed, 294 insertions, 0 deletions

diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c
index ed4229e258..6e30ac0265 100644
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -34,6 +34,8 @@
 #include <miiphy.h>
 #include <cpsw.h>
 #include "board.h"
+#include "pmic.h"
+#include "tps65217.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -117,6 +119,132 @@ static int read_eeprom(void)
 
 /* UART Defines */
 #ifdef CONFIG_SPL_BUILD
+/**
+ * tps65217_reg_read() - Generic function that can read a TPS65217 register
+ * @src_reg:          Source register address
+ * @src_val:          Address of destination variable
+ */
+
+unsigned char tps65217_reg_read(uchar src_reg, uchar *src_val)
+{
+        if (i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1))
+                return 1;
+        return 0;
+}
+
+/**
+ *  tps65217_reg_write() - Generic function that can write a TPS65217 PMIC
+ *                         register or bit field regardless of protection
+ *                         level.
+ *
+ *  @prot_level:        Register password protection.
+ *                      use PROT_LEVEL_NONE, PROT_LEVEL_1, or 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, 1 for failure.
+ */
+int tps65217_reg_write(uchar prot_level, uchar dest_reg,
+        uchar dest_val, uchar mask)
+{
+        uchar read_val;
+        uchar xor_reg;
+
+        /* if we are affecting only a bit field, read dest_reg and apply the mask */
+        if (mask != MASK_ALL_BITS) {
+                if (i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1))
+                        return 1;
+                read_val &= (~mask);
+                read_val |= (dest_val & mask);
+                dest_val = read_val;
+        }
+
+        if (prot_level > 0) {
+                xor_reg = dest_reg ^ PASSWORD_UNLOCK;
+                if (i2c_write(TPS65217_CHIP_PM, PASSWORD, 1, &xor_reg, 1))
+                        return 1;
+        }
+
+        if (i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1))
+                return 1;
+
+        if (prot_level == PROT_LEVEL_2) {
+                if (i2c_write(TPS65217_CHIP_PM, PASSWORD, 1, &xor_reg, 1))
+                        return 1;
+
+                if (i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1))
+                        return 1;
+        }
+
+        return 0;
+}
+
+int tps65217_voltage_update(unsigned char dc_cntrl_reg, unsigned char volt_sel)
+{
+        if ((dc_cntrl_reg != DEFDCDC1) && (dc_cntrl_reg != DEFDCDC2)
+                && (dc_cntrl_reg != DEFDCDC3))
+                return 1;
+
+        /* set voltage level */
+        if (tps65217_reg_write(PROT_LEVEL_2, dc_cntrl_reg, volt_sel, MASK_ALL_BITS))
+                return 1;
+
+        /* set GO bit to initiate voltage transition */
+        if (tps65217_reg_write(PROT_LEVEL_2, DEFSLEW, DCDC_GO, DCDC_GO))
+                return 1;
+
+        return 0;
+}
+
+/*
+ * voltage switching for MPU frequency switching.
+ * @module = mpu - 0, core - 1
+ * @vddx_op_vol_sel = vdd voltage to set
+ */
+
+#define MPU     0
+#define CORE    1
+
+int voltage_update(unsigned int module, unsigned char vddx_op_vol_sel)
+{
+        uchar buf[4];
+        unsigned int reg_offset;
+
+        if(module == MPU)
+                reg_offset = PMIC_VDD1_OP_REG;
+        else
+                reg_offset = PMIC_VDD2_OP_REG;
+
+        /* Select VDDx OP   */
+        if (i2c_read(PMIC_CTRL_I2C_ADDR, reg_offset, 1, buf, 1))
+                return 1;
+
+        buf[0] &= ~PMIC_OP_REG_CMD_MASK;
+
+        if (i2c_write(PMIC_CTRL_I2C_ADDR, reg_offset, 1, buf, 1))
+                return 1;
+
+        /* Configure VDDx OP  Voltage */
+        if (i2c_read(PMIC_CTRL_I2C_ADDR, reg_offset, 1, buf, 1))
+                return 1;
+
+        buf[0] &= ~PMIC_OP_REG_SEL_MASK;
+        buf[0] |= vddx_op_vol_sel;
+
+        if (i2c_write(PMIC_CTRL_I2C_ADDR, reg_offset, 1, buf, 1))
+                return 1;
+
+        if (i2c_read(PMIC_CTRL_I2C_ADDR, reg_offset, 1, buf, 1))
+                return 1;
+
+        if ((buf[0] & PMIC_OP_REG_SEL_MASK ) != vddx_op_vol_sel)
+                return 1;
+
+        return 0;
+}
+
 #define UART_RESET		(0x1 << 1)
 #define UART_CLK_RUNNING_MASK	0x1
 #define UART_SMART_IDLE_EN	(0x1 << 0x3)
diff --git a/board/ti/am335x/pmic.h b/board/ti/am335x/pmic.h
new file mode 100644
index 0000000000..e258c445cc
--- /dev/null
+++ b/board/ti/am335x/pmic.h
@@ -0,0 +1,76 @@
+/*
+ * pmic.h
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#ifndef PMIC_h
+#define PMIC_H
+
+/*
+ * The PMIC on this board is a TPS65910.
+ */
+
+#define PMIC_SR_I2C_ADDR		0x12
+#define PMIC_CTRL_I2C_ADDR		0x2D
+/* PMIC Register offsets */
+#define PMIC_VDD1_REG			0x21
+#define PMIC_VDD1_OP_REG		0x22
+#define PMIC_VDD2_REG			0x24
+#define PMIC_VDD2_OP_REG		0x25
+#define PMIC_DEVCTRL_REG		0x3f
+
+/* VDD2 & VDD1 control register (VDD2_REG & VDD1_REG) */
+#define PMIC_VGAIN_SEL_MASK		(0x3 << 6)
+#define PMIC_ILMAX_MASK			(0x1 << 5)
+#define PMIC_TSTEP_MASK			(0x7 << 2)
+#define PMIC_ST_MASK			(0x3)
+
+#define PMIC_REG_VGAIN_SEL_X1		(0x0 << 6)
+#define PMIC_REG_VGAIN_SEL_X1_0		(0x1 << 6)
+#define PMIC_REG_VGAIN_SEL_X3		(0x2 << 6)
+#define PMIC_REG_VGAIN_SEL_X4		(0x3 << 6)
+
+#define PMIC_REG_ILMAX_1_0_A		(0x0 << 5)
+#define PMIC_REG_ILMAX_1_5_A		(0x1 << 5)
+
+#define PMIC_REG_TSTEP_			(0x0 << 2)
+#define PMIC_REG_TSTEP_12_5		(0x1 << 2)
+#define PMIC_REG_TSTEP_9_4		(0x2 << 2)
+#define PMIC_REG_TSTEP_7_5		(0x3 << 2)
+#define PMIC_REG_TSTEP_6_25		(0x4 << 2)
+#define PMIC_REG_TSTEP_4_7		(0x5 << 2)
+#define PMIC_REG_TSTEP_3_12		(0x6 << 2)
+#define PMIC_REG_TSTEP_2_5		(0x7 << 2)
+
+#define PMIC_REG_ST_OFF			(0x0)
+#define PMIC_REG_ST_ON_HI_POW		(0x1)
+#define PMIC_REG_ST_OFF_1		(0x2)
+#define PMIC_REG_ST_ON_LOW_POW		(0x3)
+
+
+/* VDD2 & VDD1 voltage selection register. (VDD2_OP_REG & VDD1_OP_REG) */
+#define PMIC_OP_REG_SEL				(0x7F)
+
+#define PMIC_OP_REG_CMD_MASK			(0x1 << 7)
+#define PMIC_OP_REG_CMD_OP			(0x0 << 7)
+#define PMIC_OP_REG_CMD_SR			(0x1 << 7)
+
+#define PMIC_OP_REG_SEL_MASK			(0x7F)
+#define PMIC_OP_REG_SEL_1_1_3			(0x2E)	/* 1.1375 V */
+#define PMIC_OP_REG_SEL_1_2_6			(0x38)	/* 1.2625 V */
+
+/* Device control register . (DEVCTRL_REG) */
+#define PMIC_DEVCTRL_REG_SR_CTL_I2C_MASK	(0x1 << 4)
+#define PMIC_DEVCTRL_REG_SR_CTL_I2C_SEL_SR_I2C	(0x0 << 4)
+#define PMIC_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C	(0x1 << 4)
+
+#endif
diff --git a/board/ti/am335x/tps65217.h b/board/ti/am335x/tps65217.h
new file mode 100644
index 0000000000..3197209a98
--- /dev/null
+++ b/board/ti/am335x/tps65217.h
@@ -0,0 +1,90 @@
+/*
+ * (C) Copyright 2011
+ * Texas Instruments, <www.ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __TPS65217_H__
+#define __TPS65217_H__
+
+#include <common.h>
+#include <i2c.h>
+
+/* I2C chip address */
+#define TPS65217_CHIP_PM		0x24
+
+/* Registers */
+#define CHIPID				0x00
+#define POWER_PATH			0x01
+#define INTERRUPT			0x02
+#define CHGCONFIG0			0x03
+#define CHGCONFIG1			0x04
+#define CHGCONFIG2			0x05
+#define CHGCONFIG3			0x06
+#define WLEDCTRL1			0x07
+#define WLEDCTRL2			0x08
+#define MUXCTRL				0x09
+#define STATUS				0x0A
+#define PASSWORD			0x0B
+#define PGOOD				0x0C
+#define DEFPG				0x0D
+#define DEFDCDC1			0x0E
+#define DEFDCDC2			0x0F
+#define DEFDCDC3			0x10
+#define DEFSLEW				0x11
+#define DEFLDO1				0x12
+#define DEFLDO2				0x13
+#define DEFLS1				0x14
+#define DEFLS2				0x15
+#define ENABLE				0x16
+#define DEFUVLO				0x18
+#define SEQ1				0x19
+#define SEQ2				0x1A
+#define SEQ3				0x1B
+#define SEQ4				0x1C
+#define SEQ5				0x1D
+#define SEQ6				0x1E
+
+#define PROT_LEVEL_NONE			0x00
+#define PROT_LEVEL_1			0x01
+#define PROT_LEVEL_2			0x02
+
+#define PASSWORD_LOCK_FOR_WRITE		0x00
+#define PASSWORD_UNLOCK			0x7D
+
+#define DCDC_GO				0x80
+
+#define MASK_ALL_BITS			0xFF
+
+#define USB_INPUT_CUR_LIMIT_MASK	0x03
+#define USB_INPUT_CUR_LIMIT_100MA	0x00
+#define USB_INPUT_CUR_LIMIT_500MA	0x01
+#define USB_INPUT_CUR_LIMIT_1300MA	0x02
+#define USB_INPUT_CUR_LIMIT_1800MA	0x03
+
+#define DCDC_VOLT_SEL_1275MV		0x0F
+#define DCDC_VOLT_SEL_135MV		0x12
+
+#define LDO_MASK			0x1F
+#define LDO_VOLTAGE_OUT_3_3		0x1F
+
+#define PWR_SRC_USB_BITMASK		0x4
+#define PWR_SRC_AC_BITMASK		0x8
+#endif