drivers/power/pmic/pmic_tps65218.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2011-2013
   4  * Texas Instruments, <www.ti.com>
   5  */
   6
   7 #include <common.h>
   8 #include <i2c.h>
   9 #include <linux/errno.h>
  10 #include <power/pmic.h>
  11 #include <power/tps65218.h>
  12
  13 #ifndef CONFIG_DM_I2C
  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
  28 /**
  29  *  tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
  30  *                         register or bit field regardless of protection
  31  *                         level.
  32  *
  33  *  @prot_level:           Register password protection.  Use
  34  *                         TPS65218_PROT_LEVEL_NONE,
  35  *                         TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
  36  *  @dest_reg:             Register address to write.
  37  *  @dest_val:             Value to write.
  38  *  @mask:                 Bit mask (8 bits) to be applied.  Function will only
  39  *                         change bits that are set in the bit mask.
  40  *
  41  *  @return:               0 for success, not 0 on failure, as per the i2c API
  42  */
  43 int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
  44                        uchar mask)
  45 {
  46         uchar read_val;
  47         uchar xor_reg;
  48         int ret;
  49
  50         /*
  51          * If we are affecting only a bit field, read dest_reg and apply the
  52          * mask
  53          */
  54         if (mask != TPS65218_MASK_ALL_BITS) {
  55                 ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
  56                 if (ret)
  57                         return ret;
  58                 read_val &= (~mask);
  59                 read_val |= (dest_val & mask);
  60                 dest_val = read_val;
  61         }
  62
  63         if (prot_level > 0) {
  64                 xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
  65                 ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
  66                                 &xor_reg, 1);
  67                 if (ret)
  68                         return ret;
  69         }
  70
  71         ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
  72         if (ret)
  73                 return ret;
  74
  75         if (prot_level == TPS65218_PROT_LEVEL_2) {
  76                 ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
  77                                 &xor_reg, 1);
  78                 if (ret)
  79                         return ret;
  80
  81                 ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
  82                 if (ret)
  83                         return ret;
  84         }
  85
  86         return 0;
  87 }
  88 #else
  89 struct udevice *tps65218_dev __attribute__((section(".data"))) = NULL;
  90
  91 int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
  92 {
  93         uchar read_val;
  94         int ret;
  95
  96         if (!tps65218_dev)
  97                 return -ENODEV;
  98
  99         ret = dm_i2c_read(tps65218_dev, dest_reg,  &read_val, 1);
 100         if (ret)
 101                 return ret;
 102
 103         *dest_val = read_val;
 104
 105         return 0;
 106 }
 107
 108 int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
 109                        uchar mask)
 110 {
 111         uchar read_val;
 112         uchar xor_reg;
 113         int ret;
 114
 115         if (!tps65218_dev)
 116                 return -ENODEV;
 117
 118         /*
 119          * If we are affecting only a bit field, read dest_reg and apply the
 120          * mask
 121          */
 122         if (mask != TPS65218_MASK_ALL_BITS) {
 123                 ret = dm_i2c_read(tps65218_dev, dest_reg, &read_val, 1);
 124                 if (ret)
 125                         return ret;
 126
 127                 read_val &= (~mask);
 128                 read_val |= (dest_val & mask);
 129                 dest_val = read_val;
 130         }
 131
 132         if (prot_level > 0) {
 133                 xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
 134                 ret = dm_i2c_write(tps65218_dev, TPS65218_PASSWORD, &xor_reg,
 135                                    1);
 136                 if (ret)
 137                         return ret;
 138         }
 139
 140         ret = dm_i2c_write(tps65218_dev, dest_reg, &dest_val, 1);
 141         if (ret)
 142                 return ret;
 143
 144         if (prot_level == TPS65218_PROT_LEVEL_2) {
 145                 ret = dm_i2c_write(tps65218_dev, TPS65218_PASSWORD, &xor_reg,
 146                                    1);
 147                 if (ret)
 148                         return ret;
 149
 150                 ret = dm_i2c_write(tps65218_dev, dest_reg, &dest_val, 1);
 151                 if (ret)
 152                         return ret;
 153         }
 154
 155         return 0;
 156 }
 157 #endif
 158
 159 /**
 160  * tps65218_voltage_update() - Function to change a voltage level, as this
 161  *                             is a multi-step process.
 162  * @dc_cntrl_reg:              DC voltage control register to change.
 163  * @volt_sel:                  New value for the voltage register
 164  * @return:                    0 for success, not 0 on failure.
 165  */
 166 int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
 167 {
 168         if ((dc_cntrl_reg != TPS65218_DCDC1) &&
 169             (dc_cntrl_reg != TPS65218_DCDC2) &&
 170             (dc_cntrl_reg != TPS65218_DCDC3))
 171                 return 1;
 172
 173         /* set voltage level */
 174         if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
 175                                TPS65218_DCDC_VSEL_MASK))
 176                 return 1;
 177
 178         /* set GO bit to initiate voltage transition */
 179         if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
 180                                TPS65218_DCDC_GO, TPS65218_DCDC_GO))
 181                 return 1;
 182
 183         return 0;
 184 }
 185
 186 /**
 187  * tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
 188  *
 189  * @return:                  0 on success, -EBADE if the sequence was broken
 190  */
 191 int tps65218_toggle_fseal(void)
 192 {
 193         if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
 194                                0xb1, TPS65218_MASK_ALL_BITS))
 195                 return -EBADE;
 196
 197         if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
 198                                0xfe, TPS65218_MASK_ALL_BITS))
 199                 return -EBADE;
 200
 201         if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
 202                                0xa3, TPS65218_MASK_ALL_BITS))
 203                 return -EBADE;
 204
 205         return 0;
 206 }
 207
 208 /**
 209  * tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
 210  *
 211  * The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
 212  * toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
 213  * its value is locked and can only be reset by powering off the PMIC entirely.
 214  *
 215  * @return:                0 on success, -EBADE if the sequence was broken
 216  */
 217 int tps65218_lock_fseal(void)
 218 {
 219         int i;
 220
 221         for (i = 0; i < 3; i++)
 222                 if (tps65218_toggle_fseal())
 223                         return -EBADE;
 224
 225         return 0;
 226 }
 227
 228 #ifndef CONFIG_DM_I2C
 229 int power_tps65218_init(unsigned char bus)
 230 {
 231         static const char name[] = "TPS65218_PMIC";
 232         struct pmic *p = pmic_alloc();
 233
 234         if (!p) {
 235                 printf("%s: POWER allocation error!\n", __func__);
 236                 return -ENOMEM;
 237         }
 238
 239         p->name = name;
 240         p->interface = PMIC_I2C;
 241         p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS;
 242         p->hw.i2c.addr = TPS65218_CHIP_PM;
 243         p->hw.i2c.tx_num = 1;
 244         p->bus = bus;
 245
 246         return 0;
 247 }
 248 #else
 249 int power_tps65218_init(unsigned char bus)
 250 {
 251         struct udevice *dev = NULL;
 252         int rc;
 253
 254         rc = i2c_get_chip_for_busnum(bus, TPS65218_CHIP_PM, 1, &dev);
 255         if (rc)
 256                 return rc;
 257         tps65218_dev = dev;
 258         return 0;
 259 }
 260 #endif