106 lines
2.2 KiB
ArmAsm
106 lines
2.2 KiB
ArmAsm
/*
|
|
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <asm/pci.h>
|
|
#include <asm/post.h>
|
|
#include <asm/arch/quark.h>
|
|
#include <asm/arch/msg_port.h>
|
|
|
|
.globl car_init
|
|
car_init:
|
|
post_code(POST_CAR_START)
|
|
|
|
/*
|
|
* Quark SoC contains an embedded 512KiB SRAM (eSRAM) that is
|
|
* initialized by hardware. eSRAM is the ideal place to be used
|
|
* for Cache-As-RAM (CAR) before system memory is available.
|
|
*
|
|
* Relocate this eSRAM to a suitable location in the physical
|
|
* memory map and enable it.
|
|
*/
|
|
|
|
/* Host Memory Bound Register P03h:R08h */
|
|
mov $((MSG_PORT_HOST_BRIDGE << 16) | (HM_BOUND << 8)), %eax
|
|
mov $(DRAM_BASE + DRAM_MAX_SIZE + ESRAM_SIZE), %edx
|
|
lea 1f, %esp
|
|
jmp msg_port_write
|
|
1:
|
|
|
|
/* eSRAM Block Page Control Register P05h:R82h */
|
|
mov $((MSG_PORT_MEM_MGR << 16) | (ESRAM_BLK_CTRL << 8)), %eax
|
|
mov $(ESRAM_BLOCK_MODE | (CONFIG_ESRAM_BASE >> 24)), %edx
|
|
lea 2f, %esp
|
|
jmp msg_port_write
|
|
2:
|
|
|
|
post_code(POST_CAR_CPU_CACHE)
|
|
jmp car_init_ret
|
|
|
|
msg_port_read:
|
|
/*
|
|
* Parameter:
|
|
* eax[23:16] - Message Port ID
|
|
* eax[15:08] - Register Address
|
|
*
|
|
* Return Value:
|
|
* eax - Message Port Register value
|
|
*
|
|
* Return Address: esp
|
|
*/
|
|
|
|
or $((MSG_OP_READ << 24) | MSG_BYTE_ENABLE), %eax
|
|
mov %eax, %ebx
|
|
|
|
/* Write MCR B0:D0:F0:RD0 */
|
|
mov $(PCI_CFG_EN | MSG_CTRL_REG), %eax
|
|
mov $PCI_REG_ADDR, %dx
|
|
out %eax, %dx
|
|
mov $PCI_REG_DATA, %dx
|
|
mov %ebx, %eax
|
|
out %eax, %dx
|
|
|
|
/* Read MDR B0:D0:F0:RD4 */
|
|
mov $(PCI_CFG_EN | MSG_DATA_REG), %eax
|
|
mov $PCI_REG_ADDR, %dx
|
|
out %eax, %dx
|
|
mov $PCI_REG_DATA, %dx
|
|
in %dx, %eax
|
|
|
|
jmp *%esp
|
|
|
|
msg_port_write:
|
|
/*
|
|
* Parameter:
|
|
* eax[23:16] - Message Port ID
|
|
* eax[15:08] - Register Address
|
|
* edx - Message Port Register value to write
|
|
*
|
|
* Return Address: esp
|
|
*/
|
|
|
|
or $((MSG_OP_WRITE << 24) | MSG_BYTE_ENABLE), %eax
|
|
mov %eax, %esi
|
|
mov %edx, %edi
|
|
|
|
/* Write MDR B0:D0:F0:RD4 */
|
|
mov $(PCI_CFG_EN | MSG_DATA_REG), %eax
|
|
mov $PCI_REG_ADDR, %dx
|
|
out %eax, %dx
|
|
mov $PCI_REG_DATA, %dx
|
|
mov %edi, %eax
|
|
out %eax, %dx
|
|
|
|
/* Write MCR B0:D0:F0:RD0 */
|
|
mov $(PCI_CFG_EN | MSG_CTRL_REG), %eax
|
|
mov $PCI_REG_ADDR, %dx
|
|
out %eax, %dx
|
|
mov $PCI_REG_DATA, %dx
|
|
mov %esi, %eax
|
|
out %eax, %dx
|
|
|
|
jmp *%esp
|