diff options
Diffstat (limited to 'arch/cris/arch-v32/mach-fs/dram_init.S')
-rw-r--r-- | arch/cris/arch-v32/mach-fs/dram_init.S | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/arch/cris/arch-v32/mach-fs/dram_init.S b/arch/cris/arch-v32/mach-fs/dram_init.S deleted file mode 100644 index e1a01fa4c272..000000000000 --- a/arch/cris/arch-v32/mach-fs/dram_init.S +++ /dev/null @@ -1,117 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * DRAM/SDRAM initialization - alter with care - * This file is intended to be included from other assembler files - * - * Note: This file may not modify r8 or r9 because they are used to - * carry information from the decompressor to the kernel - * - * Copyright (C) 2000-2007 Axis Communications AB - * - * Authors: Mikael Starvik <starvik@axis.com> - */ - -/* Just to be certain the config file is included, we include it here - * explicitly instead of depending on it being included in the file that - * uses this code. - */ - -#include <hwregs/asm/reg_map_asm.h> -#include <hwregs/asm/bif_core_defs_asm.h> - - ;; WARNING! The registers r8 and r9 are used as parameters carrying - ;; information from the decompressor (if the kernel was compressed). - ;; They should not be used in the code below. - - ; Refer to BIF MDS for a description of SDRAM initialization - - ; Bank configuration - move.d REG_ADDR(bif_core, regi_bif_core, rw_sdram_cfg_grp0), $r0 - move.d CONFIG_ETRAX_SDRAM_GRP0_CONFIG, $r1 - move.d $r1, [$r0] - move.d REG_ADDR(bif_core, regi_bif_core, rw_sdram_cfg_grp1), $r0 - move.d CONFIG_ETRAX_SDRAM_GRP1_CONFIG, $r1 - move.d $r1, [$r0] - - ; Calculate value of mrs_data - ; CAS latency = 2 && bus_width = 32 => 0x40 - ; CAS latency = 3 && bus_width = 32 => 0x60 - ; CAS latency = 2 && bus_width = 16 => 0x20 - ; CAS latency = 3 && bus_width = 16 => 0x30 - - ; Check if value is already supplied in kernel config - move.d CONFIG_ETRAX_SDRAM_COMMAND, $r2 - bne _set_timing - nop - - move.d 0x40, $r4 ; Assume 32 bits and CAS latency = 2 - move.d CONFIG_ETRAX_SDRAM_TIMING, $r1 - and.d 0x07, $r1 ; Get CAS latency - cmpq 2, $r1 ; CL = 2 ? - beq _bw_check - nop - move.d 0x60, $r4 - -_bw_check: - ; Assume that group 0 width is equal to group 1. This assumption - ; is wrong for a group 1 only hardware (such as the grand old - ; StorPoint+). - move.d CONFIG_ETRAX_SDRAM_GRP0_CONFIG, $r1 - and.d 0x200, $r1 ; DRAM width is bit 9 - beq _set_timing - lslq 2, $r4 ; mrs_data starts at bit 2 - lsrq 1, $r4 ; 16 bits. Shift down value. - - ; Set timing parameters (refresh off to avoid Guinness TR 83) -_set_timing: - move.d CONFIG_ETRAX_SDRAM_TIMING, $r1 - and.d ~(3 << reg_bif_core_rw_sdram_timing___ref___lsb), $r1 - move.d REG_ADDR(bif_core, regi_bif_core, rw_sdram_timing), $r0 - move.d $r1, [$r0] - - ; Issue NOP command - move.d REG_ADDR(bif_core, regi_bif_core, rw_sdram_cmd), $r5 - moveq regk_bif_core_nop, $r1 - move.d $r1, [$r5] - - ; Wait 200us - move.d 10000, $r2 -1: bne 1b - subq 1, $r2 - - ; Issue initialization command sequence - lapc _sdram_commands_start, $r2 - lapc _sdram_commands_end, $r3 -1: clear.d $r6 - move.b [$r2+], $r6 ; Load command - or.d $r4, $r6 ; Add calculated mrs - move.d $r6, [$r5] ; Write rw_sdram_cmd - ; Wait 80 ns between each command - move.d 4000, $r7 -2: bne 2b - subq 1, $r7 - cmp.d $r2, $r3 ; Last command? - bne 1b - nop - - ; Start refresh - move.d CONFIG_ETRAX_SDRAM_TIMING, $r1 - move.d REG_ADDR(bif_core, regi_bif_core, rw_sdram_timing), $r0 - move.d $r1, [$r0] - - ; Initialization finished - ba _sdram_commands_end - nop - -_sdram_commands_start: - .byte regk_bif_core_pre ; Precharge - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_ref ; refresh - .byte regk_bif_core_mrs ; mrs -_sdram_commands_end: |