[U-Boot] [PATCH 05/22] power: Add AXP209 Power Management controller (I2C)

Henrik Nordström
2012-11-25T11:39:39Z

This adds support for AXP209 Power Management controller,
used by most sunxi (Allwinner A10/A13) based boards.

From: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Henrik Nordstrom <henrik@henriknordstrom.net>
Signed-off-by: Stefan Roese <sr@denx.de>
---
drivers/power/Makefile | 1 +
drivers/power/axp209.c | 183 ++++++++++++++++++++++++++++++++++++++++++++++++
include/axp209.h | 29 ++++++++
3 files changed, 213 insertions(+), 0 deletions(-)
create mode 100644 drivers/power/axp209.c
create mode 100644 include/axp209.h

diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 8c71901..ad768ff 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk

LIB := $(obj)libpower.o

+COBJS-$(CONFIG_AXP209_POWER) += axp209.o
COBJS-$(CONFIG_FTPMU010_POWER) += ftpmu010.o
COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o
COBJS-$(CONFIG_TWL4030_POWER) += twl4030.o
diff --git a/drivers/power/axp209.c b/drivers/power/axp209.c
new file mode 100644
index 0000000..be98d80
--- /dev/null
+++ b/drivers/power/axp209.c
@@ -0,0 +1,183 @@
+/*
+ * (C) Copyright 2012
+ * Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * 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
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <axp209.h>
+
+enum axp209_reg {
+ AXP209_CHIP_VERSION = 0x3,
+ AXP209_DCDC2_VOLTAGE = 0x23,
+ AXP209_DCDC3_VOLTAGE = 0x27,
+ AXP209_LDO24_VOLTAGE = 0x28,
+ AXP209_LDO3_VOLTAGE = 0x29,
+ AXP209_SHUTDOWN = 0x32,
+};
+
+int axp209_write(enum axp209_reg reg, u8 val)
+{
+ return i2c_write(0x34, reg, 1, &val, 1);
+}
+
+int axp209_read(enum axp209_reg reg, u8 *val)
+{
+ return i2c_read(0x34, reg, 1, val, 1);
+}
+
+int axp209_set_dcdc2(int mvolt)
+{
+ int cfg = (mvolt - 700) / 25;
+ int rc;
+ u8 current;
+
+ if (cfg < 0)
+ cfg = 0;
+ if (cfg > (1 << 6) - 1)
+ cfg = (1 << 6) - 1;
+
+ /* Do we really need to be this gentle? It has built-in voltage slope */
+ while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, &current)) == 0
+ && current != cfg) {
+ if (current < cfg)
+ current++;
+ else
+ current--;
+
+ rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
+ if (rc)
+ break;
+ }
+
+ return rc;
+}
+
+int axp209_set_dcdc3(int mvolt)
+{
+ int cfg = (mvolt - 700) / 25;
+ u8 reg;
+ int rc;
+
+ if (cfg < 0)
+ cfg = 0;
+ if (cfg > (1 << 7) - 1)
+ cfg = (1 << 7) - 1;
+
+ rc = axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
+ rc |= axp209_read(AXP209_DCDC3_VOLTAGE, &reg);
+
+ return rc;
+}
+
+int axp209_set_ldo2(int mvolt)
+{
+ int cfg = (mvolt - 1800) / 100;
+ int rc;
+ u8 reg;
+
+ if (cfg < 0)
+ cfg = 0;
+ if (cfg > 15)
+ cfg = 15;
+
+ rc = axp209_read(AXP209_LDO24_VOLTAGE, &reg);
+ if (rc)
+ return rc;
+
+ reg = (reg & 0x0f) | (cfg << 4);
+ rc = axp209_write(AXP209_LDO24_VOLTAGE, reg);
+ if (rc)
+ return rc;
+
+ return 0;
+}
+
+int axp209_set_ldo3(int mvolt)
+{
+ int cfg = (mvolt - 700) / 25;
+
+ if (cfg < 0)
+ cfg = 0;
+ if (cfg > 127)
+ cfg = 127;
+ if (mvolt == -1)
+ cfg = 0x80; /* detemined by LDO3IN pin */
+
+ return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
+}
+
+int axp209_set_ldo4(int mvolt)
+{
+ int cfg = (mvolt - 1800) / 100;
+ int rc;
+ static const int vindex[] = {
+ 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
+ 2700, 2800, 3000, 3100, 3200, 3300
+ };
+ u8 reg;
+
+ /* Translate mvolt to register cfg value, requested <= selected */
+ for (cfg = 0; mvolt < vindex[cfg] && cfg < 15; cfg++)
+ ;
+
+ rc = axp209_read(AXP209_LDO24_VOLTAGE, &reg);
+ if (rc)
+ return rc;
+
+ /* LDO4 configuration is in lower 4 bits */
+ reg = (reg & 0xf0) | (cfg << 0);
+ rc = axp209_write(AXP209_LDO24_VOLTAGE, reg);
+ if (rc)
+ return rc;
+
+ return 0;
+}
+
+void axp209_poweroff(void)
+{
+ u8 val;
+
+ if (axp209_read(AXP209_SHUTDOWN, &val) != 0)
+ return;
+
+ val |= 1 << 7;
+
+ if (axp209_write(AXP209_SHUTDOWN, val) != 0)
+ return;
+
+ udelay(10000); /* wait for power to drain */
+}
+
+int axp209_init(void)
+{
+ u8 ver;
+ int rc;
+
+ rc = axp209_read(AXP209_CHIP_VERSION, &ver);
+ if (rc)
+ return rc;
+
+ if (ver != 0x21)
+ return -1;
+
+ return 0;
+}
diff --git a/include/axp209.h b/include/axp209.h
new file mode 100644
index 0000000..61338ac
--- /dev/null
+++ b/include/axp209.h
@@ -0,0 +1,29 @@
+/*
+ * (C) Copyright 2012 Henrik Nordstrom <henrik@henriknordstrom.net>
+ *
+ * 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
+ */
+
+extern int axp209_set_dcdc2(int mvolt);
+extern int axp209_set_dcdc3(int mvolt);
+extern int axp209_set_ldo2(int mvolt);
+extern int axp209_set_ldo3(int mvolt);
+extern int axp209_set_ldo4(int mvolt);
+extern void axp209_poweroff(void);
+extern int axp209_init(void);
--
1.7.7.6