Merge branch 'master' of git://git.denx.de/u-boot-samsung

[oweals/u-boot.git] / drivers / power / pmic / pmic_tps65218.c

diff --git a/drivers/power/pmic/pmic_tps65218.c b/drivers/power/pmic/pmic_tps65218.c
index 095245637995d3f6cf44f35accb468ff1770efd9..f32fa40863880a5c9e6571bc6eb7a0935061a180 100644 (file)
--- a/drivers/power/pmic/pmic_tps65218.c
+++ b/drivers/power/pmic/pmic_tps65218.c
@@ -7,8 +7,24 @@
 
 #include <common.h>
 #include <i2c.h>
+#include <linux/errno.h>
+#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
@@ -95,3 +111,65 @@ int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
 
        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;
+}
+
+int power_tps65218_init(unsigned char bus)
+{
+       static const char name[] = "TPS65218_PMIC";
+       struct pmic *p = pmic_alloc();
+
+       if (!p) {
+               printf("%s: POWER allocation error!\n", __func__);
+               return -ENOMEM;
+       }
+
+       p->name = name;
+       p->interface = PMIC_I2C;
+       p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS;
+       p->hw.i2c.addr = TPS65218_CHIP_PM;
+       p->hw.i2c.tx_num = 1;
+       p->bus = bus;
+
+       return 0;
+}