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/*
* Copyright (C) 2009, Emcraft Systems, Ilya Yanok <yanok@emcraft.com>
*
* Based on board/freescale/mx31ads/lowlevel_init.S
* by Guennadi Liakhovetski.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm/arch/imx-regs.h>
.macro REG reg, val
ldr r2, =\reg
ldr r3, =\val
str r3, [r2]
.endm
.macro REG8 reg, val
ldr r2, =\reg
ldr r3, =\val
strb r3, [r2]
.endm
.macro DELAY loops
ldr r2, =\loops
1:
subs r2, r2, #1
nop
bcs 1b
.endm
.macro SETUP_RAM cfg, ctl
/* B8xxxxxx - NAND, 8xxxxxxx - CSD0 RAM */
REG 0xB8001010, 0x00000004
ldr r3, =\cfg
ldr r2, =WEIM_ESDCFG0
str r3, [r2]
REG 0xB8001000, 0x92100000
REG 0x80000f00, 0x12344321
REG 0xB8001000, 0xa2100000
REG 0x80000000, 0x12344321
REG 0x80000000, 0x12344321
REG 0xB8001000, 0xb2100000
REG8 0x80000033, 0xda
REG8 0x81000000, 0xff
ldr r3, =\ctl
ldr r2, =WEIM_ESDCTL0
str r3, [r2]
REG 0x80000000, 0xDEADBEEF
REG 0xB8001010, 0x0000000c
.endm
/* RedBoot: To support 133MHz DDR */
.macro init_drive_strength
/*
* Disable maximum drive strength SDRAM/DDR lines by clearing DSE1 bits
* in SW_PAD_CTL registers
*/
/* SDCLK */
ldr r1, =IOMUXC_SW_PAD_CTL(0x2b)
ldr r0, [r1, #0x6C]
bic r0, r0, #(1 << 12)
str r0, [r1, #0x6C]
/* CAS */
ldr r0, [r1, #0x70]
bic r0, r0, #(1 << 22)
str r0, [r1, #0x70]
/* RAS */
ldr r0, [r1, #0x74]
bic r0, r0, #(1 << 2)
str r0, [r1, #0x74]
/* CS2 (CSD0) */
ldr r0, [r1, #0x7C]
bic r0, r0, #(1 << 22)
str r0, [r1, #0x7C]
/* DQM3 */
ldr r0, [r1, #0x84]
bic r0, r0, #(1 << 22)
str r0, [r1, #0x84]
/* DQM2, DQM1, DQM0, SD31-SD0, A25-A0, MA10 (0x288..0x2DC) */
ldr r2, =22 /* (0x2E0 - 0x288) / 4 = 22 */
pad_loop:
ldr r0, [r1, #0x88]
bic r0, r0, #(1 << 22)
bic r0, r0, #(1 << 12)
bic r0, r0, #(1 << 2)
str r0, [r1, #0x88]
add r1, r1, #4
subs r2, r2, #0x1
bne pad_loop
.endm /* init_drive_strength */
.globl lowlevel_init
lowlevel_init:
init_drive_strength
/* Image Processing Unit: */
/* Too early to switch display on? */
/* Switch on Display Interface */
REG IPU_CONF, IPU_CONF_DI_EN
/* Clock Control Module: */
REG CCM_CCMR, 0x074B0BF5 /* Use CKIH, MCU PLL off */
DELAY 0x40000
REG CCM_CCMR, 0x074B0BF5 | CCMR_MPE /* MCU PLL on */
/* Switch to MCU PLL */
REG CCM_CCMR, (0x074B0BF5 | CCMR_MPE) & ~CCMR_MDS
/* 399-133-66.5 */
ldr r0, =CCM_BASE
ldr r1, =0xFF871650
/* PDR0 */
str r1, [r0, #0x4]
ldr r1, MPCTL_PARAM_399
/* MPCTL */
str r1, [r0, #0x10]
/* Set UPLL=240MHz, USB=60MHz */
ldr r1, =0x49FCFE7F
/* PDR1 */
str r1, [r0, #0x8]
ldr r1, UPCTL_PARAM_240
/* UPCTL */
str r1, [r0, #0x14]
/* default CLKO to 1/8 of the ARM core */
mov r1, #0x00000208
/* COSR */
str r1, [r0, #0x1c]
/* Default: 1, 4, 12, 1 */
REG CCM_SPCTL, PLL_PD(1) | PLL_MFD(4) | PLL_MFI(12) | PLL_MFN(1)
check_ddr_module:
/* Set stackpointer in internal RAM to call get_ram_size */
ldr sp, =(IRAM_BASE_ADDR + IRAM_SIZE - 16)
stmfd sp!, {r0-r11, ip, lr}
mov ip, lr /* save link reg across call */
ldr r0,=0x08000000
SETUP_RAM ESDCFG0_256MB, ESDCTL0_256MB
ldr r0,=0x80000000
ldr r1,=0x10000000
bl get_ram_size
ldr r1,=0x10000000
cmp r0,r1
beq restore_regs
SETUP_RAM ESDCFG0_128MB, ESDCTL0_128MB
ldr r0,=0x80000000
ldr r1,=0x08000000
bl get_ram_size
ldr r1,=0x08000000
cmp r0,r1
beq restore_regs
restore_regs:
ldmfd sp!, {r0-r11, ip, lr}
mov lr, ip /* restore link reg */
mov pc, lr
MPCTL_PARAM_399:
.word (((1 - 1) << 26) + ((52 - 1) << 16) + (7 << 10) + (35 << 0))
UPCTL_PARAM_240:
.word (((2 - 1) << 26) + ((13 - 1) << 16) + (9 << 10) + (3 << 0))
.equ ESDCFG0_128MB, \
(0 << 21) + /* tXP */ \
(1 << 20) + /* tWTR */ \
(2 << 18) + /* tRP */ \
(1 << 16) + /* tMRD */ \
(0 << 15) + /* tWR */ \
(5 << 12) + /* tRAS */ \
(1 << 10) + /* tRRD */ \
(3 << 8) + /* tCAS */ \
(2 << 4) + /* tRCD */ \
(0x0F << 0) /* tRC */
.equ ESDCTL0_128MB, \
(1 << 31) + /* enable */ \
(0 << 28) + /* mode */ \
(0 << 27) + /* supervisor protect */ \
(2 << 24) + /* 13 rows */ \
(2 << 20) + /* 10 cols */ \
(2 << 16) + /* 32 bit */ \
(3 << 13) + /* 7.81us (64ms/8192) */ \
(0 << 10) + /* power down timer */ \
(0 << 8) + /* full page */ \
(1 << 7) + /* burst length */ \
(0 << 0) /* precharge timer */
.equ ESDCFG0_256MB, \
(3 << 21) + /* tXP */ \
(0 << 20) + /* tWTR */ \
(2 << 18) + /* tRP */ \
(1 << 16) + /* tMRD */ \
(0 << 15) + /* tWR */ \
(5 << 12) + /* tRAS */ \
(1 << 10) + /* tRRD */ \
(3 << 8) + /* tCAS */ \
(2 << 4) + /* tRCD */ \
(7 << 0) /* tRC */
.equ ESDCTL0_256MB, \
(1 << 31) + \
(0 << 28) + \
(0 << 27) + \
(3 << 24) + /* 14 rows */ \
(2 << 20) + /* 10 cols */ \
(2 << 16) + \
(4 << 13) + /* 3.91us (64ms/16384) */ \
(0 << 10) + \
(0 << 8) + \
(1 << 7) + \
(0 << 0)
|
