| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * (C) Copyright 2011-2013 |
| * Texas Instruments, <www.ti.com> |
| */ |
| |
| #include <common.h> |
| #include <i2c.h> |
| #include <linux/errno.h> |
| #include <power/pmic.h> |
| #include <power/tps65218.h> |
| |
| #if !CONFIG_IS_ENABLED(DM_I2C) |
| 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 |
| * level. |
| * |
| * @prot_level: Register password protection. Use |
| * TPS65218_PROT_LEVEL_NONE, |
| * TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2 |
| * @dest_reg: Register address to write. |
| * @dest_val: Value to write. |
| * @mask: Bit mask (8 bits) to be applied. Function will only |
| * change bits that are set in the bit mask. |
| * |
| * @return: 0 for success, not 0 on failure, as per the i2c API |
| */ |
| int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val, |
| uchar mask) |
| { |
| uchar read_val; |
| uchar xor_reg; |
| int ret; |
| |
| /* |
| * If we are affecting only a bit field, read dest_reg and apply the |
| * mask |
| */ |
| if (mask != TPS65218_MASK_ALL_BITS) { |
| ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1); |
| if (ret) |
| return ret; |
| read_val &= (~mask); |
| read_val |= (dest_val & mask); |
| dest_val = read_val; |
| } |
| |
| if (prot_level > 0) { |
| xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK; |
| ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1, |
| &xor_reg, 1); |
| if (ret) |
| return ret; |
| } |
| |
| ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| if (ret) |
| return ret; |
| |
| if (prot_level == TPS65218_PROT_LEVEL_2) { |
| ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1, |
| &xor_reg, 1); |
| if (ret) |
| return ret; |
| |
| ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| #else |
| struct udevice *tps65218_dev __section(".data") = NULL; |
| |
| int tps65218_reg_read(uchar dest_reg, uchar *dest_val) |
| { |
| uchar read_val; |
| int ret; |
| |
| if (!tps65218_dev) |
| return -ENODEV; |
| |
| ret = dm_i2c_read(tps65218_dev, dest_reg, &read_val, 1); |
| if (ret) |
| return ret; |
| |
| *dest_val = read_val; |
| |
| return 0; |
| } |
| |
| int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val, |
| uchar mask) |
| { |
| uchar read_val; |
| uchar xor_reg; |
| int ret; |
| |
| if (!tps65218_dev) |
| return -ENODEV; |
| |
| /* |
| * If we are affecting only a bit field, read dest_reg and apply the |
| * mask |
| */ |
| if (mask != TPS65218_MASK_ALL_BITS) { |
| ret = dm_i2c_read(tps65218_dev, dest_reg, &read_val, 1); |
| if (ret) |
| return ret; |
| |
| read_val &= (~mask); |
| read_val |= (dest_val & mask); |
| dest_val = read_val; |
| } |
| |
| if (prot_level > 0) { |
| xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK; |
| ret = dm_i2c_write(tps65218_dev, TPS65218_PASSWORD, &xor_reg, |
| 1); |
| if (ret) |
| return ret; |
| } |
| |
| ret = dm_i2c_write(tps65218_dev, dest_reg, &dest_val, 1); |
| if (ret) |
| return ret; |
| |
| if (prot_level == TPS65218_PROT_LEVEL_2) { |
| ret = dm_i2c_write(tps65218_dev, TPS65218_PASSWORD, &xor_reg, |
| 1); |
| if (ret) |
| return ret; |
| |
| ret = dm_i2c_write(tps65218_dev, dest_reg, &dest_val, 1); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| /** |
| * tps65218_voltage_update() - Function to change a voltage level, as this |
| * is a multi-step process. |
| * @dc_cntrl_reg: DC voltage control register to change. |
| * @volt_sel: New value for the voltage register |
| * @return: 0 for success, not 0 on failure. |
| */ |
| int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel) |
| { |
| if ((dc_cntrl_reg != TPS65218_DCDC1) && |
| (dc_cntrl_reg != TPS65218_DCDC2) && |
| (dc_cntrl_reg != TPS65218_DCDC3)) |
| return 1; |
| |
| /* set voltage level */ |
| if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel, |
| TPS65218_DCDC_VSEL_MASK)) |
| return 1; |
| |
| /* set GO bit to initiate voltage transition */ |
| 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; |
| } |
| |
| #if !CONFIG_IS_ENABLED(DM_I2C) |
| 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; |
| } |
| #else |
| int power_tps65218_init(unsigned char bus) |
| { |
| struct udevice *dev = NULL; |
| int rc; |
| |
| rc = i2c_get_chip_for_busnum(bus, TPS65218_CHIP_PM, 1, &dev); |
| if (rc) |
| return rc; |
| tps65218_dev = dev; |
| return 0; |
| } |
| #endif |