audk/ArmPkg/Drivers/PL35xSmc/InitializeSMC.asm

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//
// Copyright (c) 2011, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution. The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
//
#include <AsmMacroIoLib.h>
#include <Library/PcdLib.h>
#include <AutoGen.h>
INCLUDE AsmMacroIoLib.inc
EXPORT InitializeSMC
PRESERVE8
AREA ModuleInitializeSMC, CODE, READONLY
// Static memory configuation definitions for SMC
SmcDirectCmd EQU 0x10
SmcSetCycles EQU 0x14
SmcSetOpMode EQU 0x18
// CS0 CS0-Interf0 NOR1 flash on the motherboard
// CS1 CS1-Interf0 Reserved for the motherboard
// CS2 CS2-Interf0 SRAM on the motherboard
// CS3 CS3-Interf0 memory-mapped Ethernet and USB controllers on the motherboard
// CS4 CS0-Interf1 NOR2 flash on the motherboard
// CS5 CS1-Interf1 memory-mapped peripherals
// CS6 CS2-Interf1 memory-mapped peripherals
// CS7 CS3-Interf1 system memory-mapped peripherals on the motherboard.
// IN r1 SmcBase
// IN r2 VideoSRamBase
// NOTE: This code is been called before any stack has been setup. It means some registers
// could be overwritten (case of 'r0')
InitializeSMC
//
// Setup NOR1 (CS0-Interface0)
//
//Write to set_cycle register(holding register for NOR 1 cycle register or NAND cycle register)
//Read cycle timeout = 0xA (0:3)
//Write cycle timeout = 0x3(7:4)
//OE Assertion Delay = 0x9(11:8)
//WE Assertion delay = 0x3(15:12)
//Page cycle timeout = 0x2(19:16)
ldr r0, = 0x0002393A
str r0, [r1, #SmcSetCycles]
//Write to set_opmode register(holding register for NOR 1 opomode register or NAND opmode register)
// 0x00000002 = MemoryWidth: 32bit
// 0x00000028 = ReadMemoryBurstLength:continuous
// 0x00000280 = WriteMemoryBurstLength:continuous
// 0x00000800 = Set Address Valid
ldr r0, = 0x00000AAA
str r0, [r1, #SmcSetOpMode]
//Write to direct_cmd register so that the NOR 1 registers(set-cycles and opmode) are updated with holding registers
// 0x00000000 = ChipSelect0-Interface 0
// 0x00400000 = CmdTypes: UpdateRegs
ldr r0, = 0x00400000
str r0, [r1, #SmcDirectCmd]
//
// Setup SRAM (CS2-Interface0)
//
ldr r0, = 0x00027158
str r0, [r1, #SmcSetCycles]
// 0x00000002 = MemoryWidth: 32bit
// 0x00000800 = Set Address Valid
ldr r0, = 0x00000802
str r0, [r1, #SmcSetOpMode]
// 0x01000000 = ChipSelect2-Interface 0
// 0x00400000 = CmdTypes: UpdateRegs
ldr r0, = 0x01400000
str r0, [r1, #SmcDirectCmd]
//
// USB/Eth/VRAM (CS3-Interface0)
//
ldr r0, = 0x000CD2AA
str r0, [r1, #SmcSetCycles]
// 0x00000002 = MemoryWidth: 32bit
// 0x00000004 = Memory reads are synchronous
// 0x00000040 = Memory writes are synchronous
ldr r0, = 0x00000046
str r0, [r1, #SmcSetOpMode]
// 0x01800000 = ChipSelect3-Interface 0
// 0x00400000 = CmdTypes: UpdateRegs
ldr r0, = 0x01C00000
str r0, [r1, #SmcDirectCmd]
//
// Setup NOR3 (CS0-Interface1)
//
ldr r0, = 0x0002393A
str r0, [r1, #SmcSetCycles]
// 0x00000002 = MemoryWidth: 32bit
// 0x00000028 = ReadMemoryBurstLength:continuous
// 0x00000280 = WriteMemoryBurstLength:continuous
// 0x00000800 = Set Address Valid
ldr r0, = 0x00000AAA
str r0, [r1, #SmcSetOpMode]
// 0x02000000 = ChipSelect0-Interface 1
// 0x00400000 = CmdTypes: UpdateRegs
ldr r0, = 0x02400000
str r0, [r1, #SmcDirectCmd]
//
// Setup Peripherals (CS3-Interface1)
//
ldr r0, = 0x00025156
str r0, [r1, #SmcSetCycles]
// 0x00000002 = MemoryWidth: 32bit
// 0x00000004 = Memory reads are synchronous
// 0x00000040 = Memory writes are synchronous
ldr r0, = 0x00000046
str r0, [r1, #SmcSetOpMode]
// 0x03800000 = ChipSelect3-Interface 1
// 0x00400000 = CmdTypes: UpdateRegs
ldr r0, = 0x03C00000
str r0, [r1, #SmcDirectCmd]
//
// Setup VRAM (CS1-Interface0)
//
ldr r0, = 0x00049249
str r0, [r1, #SmcSetCycles]
// 0x00000002 = MemoryWidth: 32bit
// 0x00000004 = Memory reads are synchronous
// 0x00000040 = Memory writes are synchronous
ldr r0, = 0x00000046
str r0, [r1, #SmcSetOpMode]
// 0x00800000 = ChipSelect1-Interface 0
// 0x00400000 = CmdTypes: UpdateRegs
ldr r0, = 0x00C00000
str r0, [r1, #SmcDirectCmd]
//
// Page mode setup for VRAM
//
//read current state
ldr r0, [r2, #0]
ldr r0, [r2, #0]
ldr r0, = 0x00000000
str r0, [r2, #0]
ldr r0, [r2, #0]
//enable page mode
ldr r0, [r2, #0]
ldr r0, [r2, #0]
ldr r0, = 0x00000000
str r0, [r2, #0]
ldr r0, = 0x00900090
str r0, [r2, #0]
//confirm page mode enabled
ldr r0, [r2, #0]
ldr r0, [r2, #0]
ldr r0, = 0x00000000
str r0, [r2, #0]
ldr r0, [r2, #0]
bx lr
END