| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <stdint.h> |
| #include <device/pci_ops.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/pci_def.h> |
| #include <soc/iomap.h> |
| #include <soc/iosf.h> |
| #include <soc/lpc.h> |
| #include <soc/pci_devs.h> |
| #include <soc/pm.h> |
| #include <soc/romstage.h> |
| #include "../chip.h" |
| |
| /* This sequence signals the PUNIT to start running. */ |
| void punit_init(void) |
| { |
| uint32_t reg; |
| uint8_t rid; |
| const struct soc_intel_baytrail_config *cfg = NULL; |
| |
| rid = pci_read_config8(IOSF_PCI_DEV, REVID); |
| |
| cfg = config_of_soc(); |
| |
| reg = iosf_punit_read(SB_BIOS_CONFIG); |
| /* Write bits 17:16 of SB_BIOS_CONFIG in the PUNIT. */ |
| reg |= SB_BIOS_CONFIG_PERF_MODE | SB_BIOS_CONFIG_PDM_MODE; |
| /* Configure VR low power mode for C0 and above. */ |
| if (rid >= RID_C_STEPPING_START && cfg != NULL && |
| (cfg->vnn_ps2_enable || cfg->vcc_ps2_enable)) { |
| printk(BIOS_DEBUG, "Enabling VR PS2 mode:"); |
| if (cfg->vnn_ps2_enable) { |
| reg |= SB_BIOS_CONFIG_PS2_EN_VNN; |
| printk(BIOS_DEBUG, " VNN"); |
| } |
| if (cfg->vcc_ps2_enable) { |
| reg |= SB_BIOS_CONFIG_PS2_EN_VCC; |
| printk(BIOS_DEBUG, " VCC"); |
| } |
| printk(BIOS_DEBUG, "\n"); |
| } |
| iosf_punit_write(SB_BIOS_CONFIG, reg); |
| |
| /* Write bits 1:0 of BIOS_RESET_CPL in the PUNIT. */ |
| reg = BIOS_RESET_CPL_ALL_DONE | BIOS_RESET_CPL_RESET_DONE; |
| pci_write_config32(IOSF_PCI_DEV, MDR_REG, reg); |
| reg = IOSF_OPCODE(IOSF_OP_WRITE_PMC) | IOSF_PORT(IOSF_PORT_PMC) | |
| IOSF_REG(BIOS_RESET_CPL) | IOSF_BYTE_EN_0; |
| pci_write_config32(IOSF_PCI_DEV, MCR_REG, reg); |
| } |