| /* |
| * Copyright (c) 2020 ITE Corporation. All Rights Reserved. |
| * Jyunlin Chen <jyunlin.chen@ite.com.tw> |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include "chip_chipregs.h" |
| #include <zephyr/toolchain.h> |
| |
| /* exports */ |
| GTEXT(__start) |
| |
| /* imports */ |
| GTEXT(__initialize) |
| GTEXT(_isr_wrapper) |
| |
| SECTION_FUNC(vectors, __start) |
| #ifdef CONFIG_RISCV_GP |
| .option push |
| .option norelax |
| /* Configure the GP register */ |
| la gp, __global_pointer$ |
| .option pop |
| #endif |
| |
| .option norvc; |
| |
| /* |
| * Set mtvec (Machine Trap-Vector Base-Address Register) |
| * to _isr_wrapper. |
| */ |
| la t0, _isr_wrapper |
| csrw mtvec, t0 |
| csrwi mie, 0 |
| |
| /* |
| * bit[3-0]@EIDSR=8: instruction local memory size is 1M byte |
| * This operation must be done before accessing memory. |
| */ |
| la t0, IT8XXX2_GCTRL_EIDSR |
| lb t1, 0(t0) |
| andi t1, t1, 0xf0 |
| ori t1, t1, 0x8 |
| sb t1, 0(t0) |
| |
| /* Jump to __initialize */ |
| tail __initialize |
| |
| /* |
| * eflash signature used to enable specific function after power-on reset. |
| * (HW mechanism) |
| * The content of 16-bytes must be the following and at offset 0x80 of binary. |
| * ---------------------------------------------------------------------------- |
| * 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th 16th |
| * ---------------------------------------------------------------------------- |
| * A5h A5h A5h A5h A5h A5h [host] [flag] 85h 12h 5Ah 5Ah AAh AAh 55h 55h |
| * ---------------------------------------------------------------------------- |
| * [host]: A4h = enable eSPI, A5h = enable LPC |
| * [flag]: |
| * bit7: it must be 1b. |
| * bit6: it must be 0b. |
| * bit5: it must be 1b. |
| * bit4: 1b = 32.768KHz is from the internal clock generator. |
| * bit3: it must be 0b. |
| * bit2: it must be 1b. |
| * bit1: it must be 0b. |
| * bit0: it must be 0b. |
| */ |
| .org 0x80 |
| .balign 16 |
| .global eflash_sig |
| eflash_sig: |
| .byte 0xA5, 0xA5, 0xA5, 0xA5, 0xA5, 0xA5 |
| #ifdef CONFIG_ESPI |
| .byte 0xA4 /* enable eSPI */ |
| #else |
| .byte 0xA5 /* enable LPC */ |
| #endif |
| /* flag of signature */ |
| #ifdef CONFIG_SOC_IT8XXX2_EXT_32K |
| .byte 0xA4 /* use external 32.768 kHz oscillator */ |
| #else |
| .byte 0xB4 /* enable internal clock generator */ |
| #endif |
| .byte 0x85, 0x12, 0x5A, 0x5A, 0xAA, 0xAA, 0x55, 0x55 |
