lowlevel_init.S
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
modified from SH-IPL+g
Renesaso SuperH / Solution Enginge MS775xSE01 BSC setting.
Support CPU : SH7750/SH7750S/SH7750R/SH7751/SH7751R
Coyright (c) 2007 Nobuhiro Iwamatsu <iwmatsu@nigauri.org>
*/
#include <config.h>
#include <asm/processor.h>
#include <asm/macro.h>
#ifdef CONFIG_CPU_SH7751
#define BCR2_D_VALUE 0x2FFC /* Area 1-6 width: 32/32/32/32/32/16 */
#define WCR1_D_VALUE 0x02770771 /* DMA:0 A6:2 A3:0 A0:1 Others:15 */
#ifdef CONFIG_MARUBUN_PCCARD
#define WCR2_D_VALUE 0xFFFE4FE7 /* A6:15 A6B:7 A5:15 A5B:7 A4:15
A3:2 A2:15 A1:15 A0:6 A0B:7 */
#else /* CONFIG_MARUBUN_PCCARD */
#define WCR2_D_VALUE 0x7FFE4FE7 /* A6:3 A6B:7 A5:15 A5B:7 A4:15
A3:2 A2:15 A1:15 A0:6 A0B:7 */
#endif /* CONFIG_MARUBUN_PCCARD */
#define WCR3_D_VALUE 0x01777771 /* A6: 0-1 A5: 1-3 A4: 1-3 A3: 1-3
A2: 1-3 A1: 1-3 A0: 0-1 */
#define RTCOR_D_VALUE 0xA50D /* Write code A5, data 0D (~15us?) */
#define SDMR3_ADDRESS 0xFF940088 /* SDMR3 address on 32-bit bus */
#define MCR_D1_VALUE 0x100901B4 /* SDRAM 32-bit, CAS/RAS Refresh, .. */
#define MCR_D2_VALUE 0x500901B4 /* Same w/MRSET now 1 (mode reg cmd) */
#else /* CONFIG_CPU_SH7751 */
#define BCR2_D_VALUE 0x2E3C /* Area 1-6 width: 32/32/64/16/32/16 */
#define WCR1_D_VALUE 0x02720777 /* DMA:0 A6:2 A4:2 A3:0 Others:15 */
#define WCR2_D_VALUE 0xFFFE4FFF /* A6:15 A6B:7 A5:15 A5B:7 A4:15
A3:2 A2:15 A1:15 A0:15 A0B:7 */
#define WCR3_D_VALUE 0x01717771 /* A6: 0-1 A5: 1-3 A4: 0-1 A3: 1-3
A2: 1-3 A1: 1-3 A0: 0-1 */
#define RTCOR_D_VALUE 0xA510 /* Write code A5, data 10 (~15us?) */
#define SDMR3_ADDRESS 0xFF940110 /* SDMR3 address on 64-bit bus */
#define MCR_D1_VALUE 0x8801001C /* SDRAM 64-bit, CAS/RAS Refresh, .. */
#define MCR_D2_VALUE 0xC801001C /* Same w/MRSET now 1 (mode reg cmd) */
#endif /* CONFIG_CPU_SH7751 */
.global lowlevel_init
.text
.align 2
lowlevel_init:
write32 CCR_A, CCR_D_DISABLE
init_bsc:
write16 FRQCR_A, FRQCR_D
write32 BCR1_A, BCR1_D
write16 BCR2_A, BCR2_D
write32 WCR1_A, WCR1_D
write32 WCR2_A, WCR2_D
write32 WCR3_A, WCR3_D
write32 MCR_A, MCR_D1
/* Set SDRAM mode */
write8 SDMR3_A, SDMR3_D
! Do you need PCMCIA setting?
! If so, please add the lines here...
write16 RTCNT_A, RTCNT_D
write16 RTCOR_A, RTCOR_D
write16 RTCSR_A, RTCSR_D
write16 RFCR_A, RFCR_D
/* Wait DRAM refresh 30 times */
mov #30, r3
1:
mov.w @r1, r0
extu.w r0, r2
cmp/hi r3, r2
bf 1b
write32 MCR_A, MCR_D2
/* Set SDRAM mode */
write8 SDMR3_A, SDMR3_D
rts
nop
.align 2
CCR_A: .long CCR
CCR_D_DISABLE: .long 0x0808
FRQCR_A: .long FRQCR
FRQCR_D:
#ifdef CONFIG_CPU_TYPE_R
.word 0x0e1a /* 12:3:3 */
#else /* CONFIG_CPU_TYPE_R */
#ifdef CONFIG_GOOD_SESH4
.word 0x00e13 /* 6:2:1 */
#else
.word 0x00e23 /* 6:1:1 */
#endif
.align 2
#endif /* CONFIG_CPU_TYPE_R */
BCR1_A: .long BCR1
BCR1_D: .long 0x00000008 /* Area 3 SDRAM */
BCR2_A: .long BCR2
BCR2_D: .long BCR2_D_VALUE /* Bus width settings */
WCR1_A: .long WCR1
WCR1_D: .long WCR1_D_VALUE /* Inter-area or turnaround wait states */
WCR2_A: .long WCR2
WCR2_D: .long WCR2_D_VALUE /* Per-area access and burst wait states */
WCR3_A: .long WCR3
WCR3_D: .long WCR3_D_VALUE /* Address setup and data hold cycles */
RTCSR_A: .long RTCSR
RTCSR_D: .word 0xA518 /* RTCSR Write Code A5h Data 18h */
.align 2
RTCNT_A: .long RTCNT
RTCNT_D: .word 0xA500 /* RTCNT Write Code A5h Data 00h */
.align 2
RTCOR_A: .long RTCOR
RTCOR_D: .word RTCOR_D_VALUE /* Set refresh time (about 15us) */
.align 2
SDMR3_A: .long SDMR3_ADDRESS
SDMR3_D: .long 0x00
MCR_A: .long MCR
MCR_D1: .long MCR_D1_VALUE
MCR_D2: .long MCR_D2_VALUE
RFCR_A: .long RFCR
RFCR_D: .word 0xA400 /* RFCR Write Code A4h Data 00h */
.align 2