[U-Boot] [PATCH] OMAP5: Power: Added more functionality to twl6035 driver

[Lubomir Popov <lpopov@mm-sol.com>]

Signed-off-by: Lubomir Popov <lpopov@mm-sol.com>

---

This patch adds some new functions that were used for the SOM5_EVB bringup,
but might be useful for other OMAP5 designs as well.

 drivers/power/twl6035.c |  140 +++++++++++++++++++++++++++++++++++++++++++----
 include/twl6035.h       |   83 ++++++++++++++++++++++++++--
 2 files changed, 206 insertions(+), 17 deletions(-)

diff --git a/drivers/power/twl6035.c b/drivers/power/twl6035.c
index d3de698..5fc517b 100644
--- a/drivers/power/twl6035.c
+++ b/drivers/power/twl6035.c
@@ -2,6 +2,8 @@
  * (C) Copyright 2012
  * Texas Instruments, <www.ti.com>
  *
+ * 02/2013 Modified by Lubomir Popov <lpopov@mm-sol.com>
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -21,9 +23,12 @@
  * MA 02111-1307 USA
  */
 #include <config.h>
+
+#ifdef CONFIG_TWL6035_POWER
+
 #include <twl6035.h>
 
-/* Functions to read and write from TWL6030 */
+/* Functions to read and write from TWL6035 */
 int twl6035_i2c_write_u8(u8 chip_no, u8 val, u8 reg)
 {
 	return i2c_write(chip_no, reg, 1, &val, 1);
@@ -47,28 +52,141 @@ static inline int palmas_read_u8(u8 chip_no, u8 reg, u8 *val)
 
 void twl6035_init_settings(void)
 {
-	return;
+#ifdef CONFIG_TWL6035_SMPS7_FPWM
+	int err;
+	/* Set SMPS7 (1.8 V I/O supply) to forced PWM mode */
+	u8 val = SMPS_MODE_SLP_FPWM | SMPS_MODE_ACT_FPWM;
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, SMPS7_CTRL, val)))
+		printf("twl6035: Could not force PWM for SMPS7: err = %d\n", err);
+#endif
+}
+
+/* On some hardware the SD card socket and LDO9_IN are powered by an
+ * external 3.3 V regulator. Therefore VDDS_SDCARD should be 3.3 V
+ * as well for 3 V cards. This requires that LDO9 is set to 'bypass'
+ * mode for such cases.
+ *
+ * NOTE: Switching LDOs between the 0.9 - 2.1 V and 2.15 - 3.3 V ranges
+ *       cannot be done on the fly and requires restart (off - change
+ *       voltage - on). This should be taken care of at a higher level.
+ */
+int twl6035_mmc1_set_ldo9(u8 vsel)
+{
+	u8 cval=0, vval=0;	/* Off by default */
+	int err;
+
+	if (vsel) {
+		/* Turn on */
+		if (vsel > LDO_VOLT_3V3) {
+			/* Put LDO9 in bypass */
+			cval = LDO9_BYP_EN | RSC_MODE_SLEEP | RSC_MODE_ACTIVE;
+			vval = LDO_VOLT_3V3;
+		}
+		else {
+			cval = RSC_MODE_SLEEP | RSC_MODE_ACTIVE;
+			vval = vsel & 0x3f;
+		}
+	}
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, LDO9_VOLTAGE, vval))) {
+		printf("twl6035: could not set LDO9 %s: err = %d\n", 
+			vsel > LDO_VOLT_3V3 ? "bypass" : "voltage", err);
+		return err;
+	}
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, LDO9_CTRL, cval)))
+		printf("twl6035: could not turn on LDO9: err = %d\n", err);
+	return err;
 }
 
 int twl6035_mmc1_poweron_ldo(void)
 {
 	u8 val = 0;
 
-	/* set LDO9 TWL6035 to 3V */
-	val = 0x2b; /* (3 -.9)*28 +1 */
-
-	if (palmas_write_u8(0x48, LDO9_VOLTAGE, val)) {
+	/* Set TWL6035 LDO9 to 3.0 V */
+	val = LDO_VOLT_3V0;
+	if (palmas_write_u8(TWL6035_CHIP_P1, LDO9_VOLTAGE, val)) {
 		printf("twl6035: could not set LDO9 voltage.\n");
 		return 1;
 	}
-
 	/* TURN ON LDO9 */
-	val = LDO_ON | LDO_MODE_SLEEP | LDO_MODE_ACTIVE;
-
-	if (palmas_write_u8(0x48, LDO9_CTRL, val)) {
+	val = RSC_MODE_SLEEP | RSC_MODE_ACTIVE;
+	if (palmas_write_u8(TWL6035_CHIP_P1, LDO9_CTRL, val)) {
 		printf("twl6035: could not turn on LDO9.\n");
 		return 1;
 	}
-
 	return 0;
 }
+
+int twl6035_usb_poweron_ldo(void)
+{
+	u8 val = 0;
+	int err;
+
+	/* Enable external VCC_3v3_AUX supply on the sEVM (SYSEN2) */
+	val = RSC_MODE_SLEEP | RSC_MODE_ACTIVE;
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, SYSEN2_CTRL, val))) {
+		printf("twl6035: could not set SYSEN2: err = %d\n", err);
+		return err;
+	}	 
+
+	/* TURN ON LDO's needed */
+
+	/* Set LDOUSB to 3.3 V */
+	val = LDO_VOLT_3V3;
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, LDOUSB_VOLTAGE, val))) {
+		printf("twl6035: could not set LDOUSB voltage: err = %d\n", err);
+		return err;
+	}
+
+	/* Enable LDOUSB */
+        val = RSC_MODE_SLEEP | RSC_MODE_ACTIVE;
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, LDOUSB_CTRL, val)))
+		printf("twl6035: could not turn on LDOUSB: err = %d\n", err);
+	return err;
+}
+
+/* Turn audio codec power and 32 kHz clock on/off
+ */
+int twl6035_audio_power(u8 on)
+{
+	u8 cval=0, vval=0, c32k=0;
+	int err;
+
+	if (on) {
+		vval = SMPS_VOLT_2V1;
+		cval = SMPS_MODE_SLP_AUTO | SMPS_MODE_ACT_AUTO;
+		c32k = RSC_MODE_SLEEP | RSC_MODE_ACTIVE;
+	}
+	/* Set SMPS9 to 2.1 V (for TWL604x), or to 0 (off) */
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, SMPS9_VOLTAGE, vval))) {
+		printf("twl6035: could not set SMPS9 voltage: err = %d\n", err);
+		return err;
+	}
+	/* Turn on or off SMPS9 */
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, SMPS9_CTRL, cval))) {
+		printf("twl6035: could not turn SMPS9 %s: err = %d\n",
+			cval ? "on" : "off", err);
+		return err;
+	}
+	/* Output 32 kHz clock on or off */
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, CLK32KGAUDIO_CTRL, c32k)))
+		printf("twl6035: could not turn CLK32KGAUDIO %s: err = %d\n",
+			c32k ? "on" : "off", err);
+	return err;
+}
+
+/* Enable/disable back-up battery (or super cap) charging.
+ * Please use defines.
+ */
+int twl6035_enable_bb_charge(u8 bb_fields)
+{
+	u8 val = bb_fields & 0x0f;
+	int err;
+
+	val |= (VRTC_EN_SLP | VRTC_EN_OFF | VRTC_PWEN);
+	if ((err = palmas_write_u8(TWL6035_CHIP_P1, BB_VRTC_CTRL, val)))
+		printf("twl6035: could not set BB_VRTC_CTRL to 0x%02x: err = %d\n", val, err);
+	return err;
+}
+
+#endif /* CONFIG_TWL6035_POWER */
+
diff --git a/include/twl6035.h b/include/twl6035.h
index ce74348..50e0b47 100644
--- a/include/twl6035.h
+++ b/include/twl6035.h
@@ -2,6 +2,8 @@
  * (C) Copyright 2012
  * Texas Instruments, <www.ti.com>
  *
+ * 02/2013 Modified by Lubomir Popov <lpopov@mm-sol.com>
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -25,18 +27,87 @@
 #include <i2c.h>
 
 /* I2C chip addresses */
-#define TWL6035_CHIP_ADDR	0x48
+#define TWL6035_CHIP_P1		0x48	/* Page 1 */
+#define TWL6035_CHIP_P2		0x49	/* Page 2 */
+#define TWL6035_CHIP_P3		0x4a	/* Page 3 */
+
+/* Page 1 registers (0x1XY translates to page 1, register address 0xXY): */
 
-/* 0x1XY translates to page 1, register address 0xXY */
+/* LDO9_CTRL */
 #define LDO9_CTRL		0x60
 #define LDO9_VOLTAGE		0x61
 
-/* Bit field definitions for LDOx_CTRL */
-#define LDO_ON			(1 << 4)
-#define LDO_MODE_SLEEP		(1 << 2)
-#define LDO_MODE_ACTIVE		(1 << 0)
+/* Control of 32 kHz audio clock */
+#define CLK32KGAUDIO_CTRL	0xd5
+
+/* SYSEN2_CTRL for VCC_3v3_AUX supply on the sEVM */
+#define SYSEN2_CTRL		0xd9
+
+/* LDOUSB_CTRL */
+#define LDOUSB_CTRL		0x64
+#define LDOUSB_VOLTAGE		0x65
+
+/* Bit field definitions for LDOx_CTRL, SYSENx_CTRL 
+ * and some other xxx_CTRL resources
+ */
+#define LDO9_BYP_EN		(1 << 6)	/* LDO9 only! */
+#define RSC_STAT_ON		(1 << 4)	/* RO bit! */
+#define RSC_MODE_SLEEP		(1 << 2)
+#define RSC_MODE_ACTIVE		(1 << 0)
+
+/* Some LDO voltage values */
+#define LDO_VOLT_OFF		0
+#define LDO_VOLT_1V8		0x13
+#define LDO_VOLT_3V0		0x2b
+#define LDO_VOLT_3V3		0x31
+/* Request bypass, LDO9 only */
+#define LDO9_BYPASS		0x3f
+
+/* SMPS7_CTRL */
+#define SMPS7_CTRL		0x30
+
+/* SMPS9_CTRL */
+#define SMPS9_CTRL		0x38
+#define SMPS9_VOLTAGE		0x3b
+
+/* Bit field definitions for SMPSx_CTRL */
+#define SMPS_MODE_ACT_AUTO	1
+#define SMPS_MODE_ACT_ECO	2
+#define SMPS_MODE_ACT_FPWM	3
+#define SMPS_MODE_SLP_AUTO	(1 << 2)
+#define SMPS_MODE_SLP_ECO	(2 << 2)
+#define SMPS_MODE_SLP_FPWM	(3 << 2)
+
+/* Some popular SMPS voltages, all with RANGE=1; note
+ * that RANGE cannot be changed on the fly
+ */
+#define SMPS_VOLT_OFF		0
+#define SMPS_VOLT_1V2		0x90
+#define SMPS_VOLT_1V8		0xae
+#define SMPS_VOLT_2V1		0xbd
+#define SMPS_VOLT_3V0		0xea
+#define SMPS_VOLT_3V3		0xf9
+
+/* Backup Battery & VRTC Control */
+#define	BB_VRTC_CTRL		0xa8
+/* Bit definitions for BB_VRTC_CTRL */
+#define VRTC_EN_SLP		(1 << 6)
+#define VRTC_EN_OFF		(1 << 5)
+#define VRTC_PWEN		(1 << 4)
+#define BB_LOW_ICHRG		(1 << 3)
+#define BB_HIGH_ICHRG		(0 << 3)
+#define BB_VSEL_3V0		(0 << 1)
+#define BB_VSEL_2V5		(1 << 1)
+#define BB_VSEL_3V15		(2 << 1)
+#define BB_VSEL_VBAT		(3 << 1)
+#define BB_CHRG_EN		(1 << 0)
 
 int twl6035_i2c_write_u8(u8 chip_no, u8 val, u8 reg);
 int twl6035_i2c_read_u8(u8 chip_no, u8 *val, u8 reg);
 void twl6035_init_settings(void);
 int twl6035_mmc1_poweron_ldo(void);
+int twl6035_mmc1_set_ldo9(u8 vsel);
+int twl6035_usb_poweron_ldo(void);
+int twl6035_audio_power(u8 on);
+int twl6035_enable_bb_charge(u8 bb_fields);
+
-- 
1.7.9.5