u-boot/arch/x86/cpu/quark/car.S
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

104 lines
2.2 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*/
#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