/* * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. * Copyright (c) 2018, Icenowy Zheng * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include #include #include #include #include #include #define AXP805_ADDR 0x36 #define AXP805_ID 0x03 enum pmic_type { NO_PMIC, AXP805, }; enum pmic_type pmic; static int sunxi_init_r_i2c(void) { uint32_t reg; /* get currently configured function for pins PL0 and PL1 */ reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x00); if ((reg & 0xff) == 0x33) { NOTICE("PMIC: already configured for TWI\n"); } /* switch pins PL0 and PL1 to I2C */ mmio_write_32(SUNXI_R_PIO_BASE + 0x00, (reg & ~0xff) | 0x33); /* level 2 drive strength */ reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x14); mmio_write_32(SUNXI_R_PIO_BASE + 0x14, (reg & ~0x0f) | 0xa); /* set both ports to pull-up */ reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x1c); mmio_write_32(SUNXI_R_PIO_BASE + 0x1c, (reg & ~0x0f) | 0x5); /* assert & de-assert reset of R_I2C */ reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c); mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, 0); reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c); mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, reg | 0x00010000); /* un-gate R_I2C clock */ reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c); mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, reg | 0x00000001); /* call mi2cv driver */ i2c_init((void *)SUNXI_R_I2C_BASE); return 0; } int axp_i2c_read(uint8_t chip, uint8_t reg, uint8_t *val) { int ret; ret = i2c_write(chip, 0, 0, ®, 1); if (ret) return ret; return i2c_read(chip, 0, 0, val, 1); } int axp_i2c_write(uint8_t chip, uint8_t reg, uint8_t val) { return i2c_write(chip, reg, 1, &val, 1); } static int axp805_probe(void) { int ret; uint8_t val; ret = axp_i2c_write(AXP805_ADDR, 0xff, 0x0); if (ret) { ERROR("PMIC: Cannot put AXP805 to master mode.\n"); return -EPERM; } ret = axp_i2c_read(AXP805_ADDR, AXP805_ID, &val); if (!ret && ((val & 0xcf) == 0x40)) NOTICE("PMIC: AXP805 detected\n"); else if (ret) { ERROR("PMIC: Cannot communicate with AXP805.\n"); return -EPERM; } else { ERROR("PMIC: Non-AXP805 chip attached at AXP805's address.\n"); return -EINVAL; } return 0; } int sunxi_pmic_setup(void) { int ret; sunxi_init_r_i2c(); NOTICE("PMIC: Probing AXP805\n"); pmic = AXP805; ret = axp805_probe(); if (ret) pmic = NO_PMIC; else pmic = AXP805; return 0; } void __dead2 sunxi_power_down(void) { uint8_t val; switch (pmic) { case AXP805: val = 0x26; /* Default value for REG 32H */ axp_i2c_read(AXP805_ADDR, 0x32, &val); val |= 0x80; axp_i2c_write(AXP805_ADDR, 0x32, val); break; default: break; } udelay(1000); ERROR("PSCI: Cannot communicate with PMIC, halting\n"); wfi(); panic(); }