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