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x86: quark: Add Cache-As-RAM initialization 

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.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2015-02-02 22:35:26 +08:00 committed by Simon Glass
parent 3c8ae536ec
commit 0fae4d24df
1 changed files with 105 additions and 0 deletions
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105
arch/x86/cpu/quark/car.S Normal file
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/*
* 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