pmic: tps65218: add useful functions and defines

Add the following functions: tps65218_reg_read() for accessing redisters tps65218_toggle_fseal() for toggling the fseal bit tps65218_lock_fsea() for locking the fseal bit to 1 Add the following defines: All status register bits Cc: Tom Rini <trini@konsulko.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Cc: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il> Reviewed-by: Tom Rini <trini@konsulko.com>

pmic: tps65218: add useful functions and defines
Add the following functions: tps65218_reg_read() for accessing redisters tps65218_toggle_fseal() for toggling the fseal bit tps65218_lock_fsea() for locking the fseal bit to 1 Add the following defines: All status register bits Cc: Tom Rini <trini@konsulko.com> Cc: Albert Aribaud <albert.u.boot@aribaud.net> Cc: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il> Reviewed-by: Tom Rini <trini@konsulko.com>
Nikita Kiryanov · Tom Rini
1 parent 5dc5a8cac7
Showing 2 changed files with 68 additions and 0 deletions Side-by-side Diff
drivers/power/pmic/pmic_tps65218.c
include/power/tps65218.h
@@ -11,6 +11,20 @@
 #include <power/pmic.h>
 #include <power/tps65218.h>
  
+int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
+{
+	uchar read_val;
+	int ret;
+
+	ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
+	if (ret)
+		return ret;
+
+	*dest_val = read_val;
+
+	return 0;
+}
+
 /**
  *  tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
  *			   register or bit field regardless of protection
@@ -94,6 +108,48 @@
 	if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
 			       TPS65218_DCDC_GO, TPS65218_DCDC_GO))
 		return 1;
+
+	return 0;
+}
+
+/**
+ * tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
+ *
+ * @return:		     0 on success, -EBADE if the sequence was broken
+ */
+int tps65218_toggle_fseal(void)
+{
+	if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
+			       0xb1, TPS65218_MASK_ALL_BITS))
+		return -EBADE;
+
+	if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
+			       0xfe, TPS65218_MASK_ALL_BITS))
+		return -EBADE;
+
+	if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
+			       0xa3, TPS65218_MASK_ALL_BITS))
+		return -EBADE;
+
+	return 0;
+}
+
+/**
+ * tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
+ *
+ * The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
+ * toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
+ * its value is locked and can only be reset by powering off the PMIC entirely.
+ *
+ * @return:		   0 on success, -EBADE if the sequence was broken
+ */
+int tps65218_lock_fseal(void)
+{
+	int i;
+
+	for (i = 0; i < 3; i++)
+		if (tps65218_toggle_fseal())
+			return -EBADE;
  
 	return 0;
 }
@@ -8,6 +8,8 @@
 #ifndef __POWER_TPS65218_H__
 #define __POWER_TPS65218_H__
  
+#include <linux/bitops.h>
+
 /* I2C chip address */
 #define TPS65218_CHIP_PM			0x24
  
  
@@ -60,9 +62,19 @@
 #define TPS65218_DCDC_VOLT_SEL_1260MV		0x29
 #define TPS65218_DCDC_VOLT_SEL_1330MV		0x30
  
+#define TPS65218_CC_STAT	(BIT(0) | BIT(1))
+#define TPS65218_STATE		(BIT(2) | BIT(3))
+#define TPS65218_PB_STATE	BIT(4)
+#define TPS65218_AC_STATE	BIT(5)
+#define TPS65218_EE		BIT(6)
+#define TPS65218_FSEAL		BIT(7)
+
+int tps65218_reg_read(uchar dest_reg, uchar *dest_val);
 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);
+int tps65218_toggle_fseal(void);
+int tps65218_lock_fseal(void);
 int power_tps65218_init(unsigned char bus);
 #endif	/* __POWER_TPS65218_H__ */
...	...	@@ -11,6 +11,20 @@
11	11	#include <power/pmic.h>
12	12	#include <power/tps65218.h>
13	13
	14	+int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
	15	+{
	16	+ uchar read_val;
	17	+ int ret;
	18	+
	19	+ ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
	20	+ if (ret)
	21	+ return ret;
	22	+
	23	+ *dest_val = read_val;
	24	+
	25	+ return 0;
	26	+}
	27	+
14	28	/**
15	29	* tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
16	30	* register or bit field regardless of protection
...	...	@@ -94,6 +108,48 @@
94	108	if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
95	109	TPS65218_DCDC_GO, TPS65218_DCDC_GO))
96	110	return 1;
	111	+
	112	+ return 0;
	113	+}
	114	+
	115	+/**
	116	+ * tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
	117	+ *
	118	+ * @return: 0 on success, -EBADE if the sequence was broken
	119	+ */
	120	+int tps65218_toggle_fseal(void)
	121	+{
	122	+ if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
	123	+ 0xb1, TPS65218_MASK_ALL_BITS))
	124	+ return -EBADE;
	125	+
	126	+ if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
	127	+ 0xfe, TPS65218_MASK_ALL_BITS))
	128	+ return -EBADE;
	129	+
	130	+ if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
	131	+ 0xa3, TPS65218_MASK_ALL_BITS))
	132	+ return -EBADE;
	133	+
	134	+ return 0;
	135	+}
	136	+
	137	+/**
	138	+ * tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
	139	+ *
	140	+ * The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
	141	+ * toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
	142	+ * its value is locked and can only be reset by powering off the PMIC entirely.
	143	+ *
	144	+ * @return: 0 on success, -EBADE if the sequence was broken
	145	+ */
	146	+int tps65218_lock_fseal(void)
	147	+{
	148	+ int i;
	149	+
	150	+ for (i = 0; i < 3; i++)
	151	+ if (tps65218_toggle_fseal())
	152	+ return -EBADE;
97	153
98	154	return 0;
99	155	}
...	...	@@ -8,6 +8,8 @@
8	8	#ifndef __POWER_TPS65218_H__
9	9	#define __POWER_TPS65218_H__
10	10
	11	+#include <linux/bitops.h>
	12	+
11	13	/* I2C chip address */
12	14	#define TPS65218_CHIP_PM 0x24
13	15
14	16
...	...	@@ -60,9 +62,19 @@
60	62	#define TPS65218_DCDC_VOLT_SEL_1260MV 0x29
61	63	#define TPS65218_DCDC_VOLT_SEL_1330MV 0x30
62	64
	65	+#define TPS65218_CC_STAT (BIT(0) \| BIT(1))
	66	+#define TPS65218_STATE (BIT(2) \| BIT(3))
	67	+#define TPS65218_PB_STATE BIT(4)
	68	+#define TPS65218_AC_STATE BIT(5)
	69	+#define TPS65218_EE BIT(6)
	70	+#define TPS65218_FSEAL BIT(7)
	71	+
	72	+int tps65218_reg_read(uchar dest_reg, uchar *dest_val);
63	73	int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
64	74	uchar mask);
65	75	int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel);
	76	+int tps65218_toggle_fseal(void);
	77	+int tps65218_lock_fseal(void);
66	78	int power_tps65218_init(unsigned char bus);
67	79	#endif /* __POWER_TPS65218_H__ */