File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/frv/kernel/head-mmu-fr451.S b/arch/frv/kernel/head-mmu-fr451.S
new file mode 100644
index 0000000..98f87d5
--- /dev/null
+++ b/arch/frv/kernel/head-mmu-fr451.S
@@ -0,0 +1,374 @@
+/* head-mmu-fr451.S: FR451 mmu-linux specific bits of initialisation
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/threads.h>
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+#include <asm/page.h>
+#include <asm/mem-layout.h>
+#include <asm/spr-regs.h>
+#include <asm/mb86943a.h>
+#include "head.inc"
+
+
+#define __400_DBR0 0xfe000e00
+#define __400_DBR1 0xfe000e08
+#define __400_DBR2 0xfe000e10
+#define __400_DBR3 0xfe000e18
+#define __400_DAM0 0xfe000f00
+#define __400_DAM1 0xfe000f08
+#define __400_DAM2 0xfe000f10
+#define __400_DAM3 0xfe000f18
+#define __400_LGCR 0xfe000010
+#define __400_LCR 0xfe000100
+#define __400_LSBR 0xfe000c00
+
+ __INIT
+ .balign 4
+
+###############################################################################
+#
+# describe the position and layout of the SDRAM controller registers
+#
+# ENTRY: EXIT:
+# GR5 - cacheline size
+# GR11 - displacement of 2nd SDRAM addr reg from GR14
+# GR12 - displacement of 3rd SDRAM addr reg from GR14
+# GR13 - displacement of 4th SDRAM addr reg from GR14
+# GR14 - address of 1st SDRAM addr reg
+# GR15 - amount to shift address by to match SDRAM addr reg
+# GR26 &__head_reference [saved]
+# GR30 LED address [saved]
+# CC0 - T if DBR0 is present
+# CC1 - T if DBR1 is present
+# CC2 - T if DBR2 is present
+# CC3 - T if DBR3 is present
+#
+###############################################################################
+ .globl __head_fr451_describe_sdram
+__head_fr451_describe_sdram:
+ sethi.p %hi(__400_DBR0),gr14
+ setlo %lo(__400_DBR0),gr14
+ setlos.p #__400_DBR1-__400_DBR0,gr11
+ setlos #__400_DBR2-__400_DBR0,gr12
+ setlos.p #__400_DBR3-__400_DBR0,gr13
+ setlos #32,gr5 ; cacheline size
+ setlos.p #0,gr15 ; amount to shift addr reg by
+ setlos #0x00ff,gr4
+ movgs gr4,cccr ; extant DARS/DAMK regs
+ bralr
+
+###############################################################################
+#
+# rearrange the bus controller registers
+#
+# ENTRY: EXIT:
+# GR26 &__head_reference [saved]
+# GR30 LED address revised LED address
+#
+###############################################################################
+ .globl __head_fr451_set_busctl
+__head_fr451_set_busctl:
+ sethi.p %hi(__400_LGCR),gr4
+ setlo %lo(__400_LGCR),gr4
+ sethi.p %hi(__400_LSBR),gr10
+ setlo %lo(__400_LSBR),gr10
+ sethi.p %hi(__400_LCR),gr11
+ setlo %lo(__400_LCR),gr11
+
+ # set the bus controller
+ ldi @(gr4,#0),gr5
+ ori gr5,#0xff,gr5 ; make sure all chip-selects are enabled
+ sti gr5,@(gr4,#0)
+
+ sethi.p %hi(__region_CS1),gr4
+ setlo %lo(__region_CS1),gr4
+ sethi.p %hi(__region_CS1_M),gr5
+ setlo %lo(__region_CS1_M),gr5
+ sethi.p %hi(__region_CS1_C),gr6
+ setlo %lo(__region_CS1_C),gr6
+ sti gr4,@(gr10,#1*0x08)
+ sti gr5,@(gr10,#1*0x08+0x100)
+ sti gr6,@(gr11,#1*0x08)
+ sethi.p %hi(__region_CS2),gr4
+ setlo %lo(__region_CS2),gr4
+ sethi.p %hi(__region_CS2_M),gr5
+ setlo %lo(__region_CS2_M),gr5
+ sethi.p %hi(__region_CS2_C),gr6
+ setlo %lo(__region_CS2_C),gr6
+ sti gr4,@(gr10,#2*0x08)
+ sti gr5,@(gr10,#2*0x08+0x100)
+ sti gr6,@(gr11,#2*0x08)
+ sethi.p %hi(__region_CS3),gr4
+ setlo %lo(__region_CS3),gr4
+ sethi.p %hi(__region_CS3_M),gr5
+ setlo %lo(__region_CS3_M),gr5
+ sethi.p %hi(__region_CS3_C),gr6
+ setlo %lo(__region_CS3_C),gr6
+ sti gr4,@(gr10,#3*0x08)
+ sti gr5,@(gr10,#3*0x08+0x100)
+ sti gr6,@(gr11,#3*0x08)
+ sethi.p %hi(__region_CS4),gr4
+ setlo %lo(__region_CS4),gr4
+ sethi.p %hi(__region_CS4_M),gr5
+ setlo %lo(__region_CS4_M),gr5
+ sethi.p %hi(__region_CS4_C),gr6
+ setlo %lo(__region_CS4_C),gr6
+ sti gr4,@(gr10,#4*0x08)
+ sti gr5,@(gr10,#4*0x08+0x100)
+ sti gr6,@(gr11,#4*0x08)
+ sethi.p %hi(__region_CS5),gr4
+ setlo %lo(__region_CS5),gr4
+ sethi.p %hi(__region_CS5_M),gr5
+ setlo %lo(__region_CS5_M),gr5
+ sethi.p %hi(__region_CS5_C),gr6
+ setlo %lo(__region_CS5_C),gr6
+ sti gr4,@(gr10,#5*0x08)
+ sti gr5,@(gr10,#5*0x08+0x100)
+ sti gr6,@(gr11,#5*0x08)
+ sethi.p %hi(__region_CS6),gr4
+ setlo %lo(__region_CS6),gr4
+ sethi.p %hi(__region_CS6_M),gr5
+ setlo %lo(__region_CS6_M),gr5
+ sethi.p %hi(__region_CS6_C),gr6
+ setlo %lo(__region_CS6_C),gr6
+ sti gr4,@(gr10,#6*0x08)
+ sti gr5,@(gr10,#6*0x08+0x100)
+ sti gr6,@(gr11,#6*0x08)
+ sethi.p %hi(__region_CS7),gr4
+ setlo %lo(__region_CS7),gr4
+ sethi.p %hi(__region_CS7_M),gr5
+ setlo %lo(__region_CS7_M),gr5
+ sethi.p %hi(__region_CS7_C),gr6
+ setlo %lo(__region_CS7_C),gr6
+ sti gr4,@(gr10,#7*0x08)
+ sti gr5,@(gr10,#7*0x08+0x100)
+ sti gr6,@(gr11,#7*0x08)
+ membar
+ bar
+
+ # adjust LED bank address
+#ifdef CONFIG_MB93091_VDK
+ sethi.p %hi(__region_CS2 + 0x01200004),gr30
+ setlo %lo(__region_CS2 + 0x01200004),gr30
+#endif
+ bralr
+
+###############################################################################
+#
+# determine the total SDRAM size
+#
+# ENTRY: EXIT:
+# GR25 - SDRAM size
+# GR26 &__head_reference [saved]
+# GR30 LED address [saved]
+#
+###############################################################################
+ .globl __head_fr451_survey_sdram
+__head_fr451_survey_sdram:
+ sethi.p %hi(__400_DAM0),gr11
+ setlo %lo(__400_DAM0),gr11
+ sethi.p %hi(__400_DBR0),gr12
+ setlo %lo(__400_DBR0),gr12
+
+ sethi.p %hi(0xfe000000),gr17 ; unused SDRAM DBR value
+ setlo %lo(0xfe000000),gr17
+ setlos #0,gr25
+
+ ldi @(gr12,#0x00),gr4 ; DAR0
+ subcc gr4,gr17,gr0,icc0
+ beq icc0,#0,__head_no_DCS0
+ ldi @(gr11,#0x00),gr6 ; DAM0: bits 31:20 match addr 31:20
+ add gr25,gr6,gr25
+ addi gr25,#1,gr25
+__head_no_DCS0:
+
+ ldi @(gr12,#0x08),gr4 ; DAR1
+ subcc gr4,gr17,gr0,icc0
+ beq icc0,#0,__head_no_DCS1
+ ldi @(gr11,#0x08),gr6 ; DAM1: bits 31:20 match addr 31:20
+ add gr25,gr6,gr25
+ addi gr25,#1,gr25
+__head_no_DCS1:
+
+ ldi @(gr12,#0x10),gr4 ; DAR2
+ subcc gr4,gr17,gr0,icc0
+ beq icc0,#0,__head_no_DCS2
+ ldi @(gr11,#0x10),gr6 ; DAM2: bits 31:20 match addr 31:20
+ add gr25,gr6,gr25
+ addi gr25,#1,gr25
+__head_no_DCS2:
+
+ ldi @(gr12,#0x18),gr4 ; DAR3
+ subcc gr4,gr17,gr0,icc0
+ beq icc0,#0,__head_no_DCS3
+ ldi @(gr11,#0x18),gr6 ; DAM3: bits 31:20 match addr 31:20
+ add gr25,gr6,gr25
+ addi gr25,#1,gr25
+__head_no_DCS3:
+ bralr
+
+###############################################################################
+#
+# set the protection map with the I/DAMPR registers
+#
+# ENTRY: EXIT:
+# GR25 SDRAM size [saved]
+# GR26 &__head_reference [saved]
+# GR30 LED address [saved]
+#
+#
+# Using this map:
+# REGISTERS ADDRESS RANGE VIEW
+# =============== ====================== ===============================
+# IAMPR0/DAMPR0 0xC0000000-0xCFFFFFFF Cached kernel RAM Window
+# DAMPR11 0xE0000000-0xFFFFFFFF Uncached I/O
+#
+###############################################################################
+ .globl __head_fr451_set_protection
+__head_fr451_set_protection:
+ movsg lr,gr27
+
+ # set the I/O region protection registers for FR451 in MMU mode
+#define PGPROT_IO xAMPRx_L|xAMPRx_M|xAMPRx_S_KERNEL|xAMPRx_C|xAMPRx_V
+
+ sethi.p %hi(__region_IO),gr5
+ setlo %lo(__region_IO),gr5
+ setlos #PGPROT_IO|xAMPRx_SS_512Mb,gr4
+ or gr4,gr5,gr4
+ movgs gr5,damlr11 ; General I/O tile
+ movgs gr4,dampr11
+
+ # need to open a window onto at least part of the RAM for the kernel's use
+ sethi.p %hi(__sdram_base),gr8
+ setlo %lo(__sdram_base),gr8 ; physical address
+ sethi.p %hi(__page_offset),gr9
+ setlo %lo(__page_offset),gr9 ; virtual address
+
+ setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_256Mb|xAMPRx_S_KERNEL|xAMPRx_V,gr11
+ or gr8,gr11,gr8
+
+ movgs gr9,iamlr0 ; mapped from real address 0
+ movgs gr8,iampr0 ; cached kernel memory at 0xC0000000
+ movgs gr9,damlr0
+ movgs gr8,dampr0
+
+ # set a temporary mapping for the kernel running at address 0 until we've turned on the MMU
+ sethi.p %hi(__sdram_base),gr9
+ setlo %lo(__sdram_base),gr9 ; virtual address
+
+ and.p gr4,gr11,gr4
+ and gr5,gr11,gr5
+ or.p gr4,gr11,gr4
+ or gr5,gr11,gr5
+
+ movgs gr9,iamlr1 ; mapped from real address 0
+ movgs gr8,iampr1 ; cached kernel memory at 0x00000000
+ movgs gr9,damlr1
+ movgs gr8,dampr1
+
+ # we use DAMR2-10 for kmap_atomic(), cache flush and TLB management
+ # since the DAMLR regs are not going to change, we can set them now
+ # also set up IAMLR2 to the same as DAMLR5
+ sethi.p %hi(KMAP_ATOMIC_PRIMARY_FRAME),gr4
+ setlo %lo(KMAP_ATOMIC_PRIMARY_FRAME),gr4
+ sethi.p %hi(PAGE_SIZE),gr5
+ setlo %lo(PAGE_SIZE),gr5
+
+ movgs gr4,damlr2
+ movgs gr4,iamlr2
+ add gr4,gr5,gr4
+ movgs gr4,damlr3
+ add gr4,gr5,gr4
+ movgs gr4,damlr4
+ add gr4,gr5,gr4
+ movgs gr4,damlr5
+ add gr4,gr5,gr4
+ movgs gr4,damlr6
+ add gr4,gr5,gr4
+ movgs gr4,damlr7
+ add gr4,gr5,gr4
+ movgs gr4,damlr8
+ add gr4,gr5,gr4
+ movgs gr4,damlr9
+ add gr4,gr5,gr4
+ movgs gr4,damlr10
+
+ movgs gr0,dampr2
+ movgs gr0,dampr4
+ movgs gr0,dampr5
+ movgs gr0,dampr6
+ movgs gr0,dampr7
+ movgs gr0,dampr8
+ movgs gr0,dampr9
+ movgs gr0,dampr10
+
+ movgs gr0,iamlr3
+ movgs gr0,iamlr4
+ movgs gr0,iamlr5
+ movgs gr0,iamlr6
+ movgs gr0,iamlr7
+
+ movgs gr0,iampr2
+ movgs gr0,iampr3
+ movgs gr0,iampr4
+ movgs gr0,iampr5
+ movgs gr0,iampr6
+ movgs gr0,iampr7
+
+ # start in TLB context 0 with the swapper's page tables
+ movgs gr0,cxnr
+
+ sethi.p %hi(swapper_pg_dir),gr4
+ setlo %lo(swapper_pg_dir),gr4
+ sethi.p %hi(__page_offset),gr5
+ setlo %lo(__page_offset),gr5
+ sub gr4,gr5,gr4
+ movgs gr4,ttbr
+ setlos #xAMPRx_L|xAMPRx_M|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V,gr5
+ or gr4,gr5,gr4
+ movgs gr4,dampr3
+
+ # the FR451 also has an extra trap base register
+ movsg tbr,gr4
+ movgs gr4,btbr
+
+ LEDS 0x3300
+ jmpl @(gr27,gr0)
+
+###############################################################################
+#
+# finish setting up the protection registers
+#
+###############################################################################
+ .globl __head_fr451_finalise_protection
+__head_fr451_finalise_protection:
+ # turn on the timers as appropriate
+ movgs gr0,timerh
+ movgs gr0,timerl
+ movgs gr0,timerd
+ movsg hsr0,gr4
+ sethi.p %hi(HSR0_ETMI),gr5
+ setlo %lo(HSR0_ETMI),gr5
+ or gr4,gr5,gr4
+ movgs gr4,hsr0
+
+ # clear the TLB entry cache
+ movgs gr0,iamlr1
+ movgs gr0,iampr1
+ movgs gr0,damlr1
+ movgs gr0,dampr1
+
+ # clear the PGE cache
+ sethi.p %hi(__flush_tlb_all),gr4
+ setlo %lo(__flush_tlb_all),gr4
+ jmpl @(gr4,gr0)