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>

diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 9a8bfe07b8e3a67c33123f45b97a69fe3c51a7c1..a472f61f88f59aa4c0938daef3fd72578b6345f4 100644 (file)
--- a/drivers/power/pmic/Makefile
+++ b/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

diff --git a/drivers/power/pmic/pmic_tps65218.c b/drivers/power/pmic/pmic_tps65218.c
new file mode 100644 (file)
index 0000000..0952456
--- /dev/null
+++ b/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;
+}

diff --git a/include/power/tps65218.h b/include/power/tps65218.h
new file mode 100644 (file)
index 0000000..67aa2f8
--- /dev/null
+++ b/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__ */