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ARC changes for 3.15

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* Support for external initrd from Noam
 * Fix broken serial console in nsimosci Virtual Platform
 * Reuse of ENTRY/END assembler macros across hand asm code
 * Other minor fixes here and there
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Merge tag 'arc-v3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC changes from Vineet Gupta:
 - Support for external initrd from Noam
 - Fix broken serial console in nsimosci Virtual Platform
 - Reuse of ENTRY/END assembler macros across hand asm code
 - Other minor fixes here and there

* tag 'arc-v3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: [nsimosci] Unbork console
  ARC: [nsimosci] Change .dts to use generic 8250 UART
  ARC: [SMP] General Fixes
  ARC: Remove unused DT template file
  ARC: [clockevent] simplify timer ISR
  ARC: [clockevent] can't be SoC specific
  ARC: Remove ARC_HAS_COH_RTSC
  ARC: switch to generic ENTRY/END assembler annotations
  ARC: support external initrd
  ARC: add uImage to .gitignore
  ARC: [arcfpga] Fix __initconst data const-correctness
This commit is contained in:
Linus Torvalds 2014-04-07 17:51:34 -07:00
commit 3573d3869d
21 changed files with 114 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arc/boot/.gitignore vendored
View File

@ -1 +1,2 @@
*.dtb*
uImage

12
arch/arc/boot/dts/nsimosci.dts
View File

@ -11,13 +11,16 @@
/ {
compatible = "snps,nsimosci";
clock-frequency = <80000000>; /* 80 MHZ */
clock-frequency = <20000000>; /* 20 MHZ */
#address-cells = <1>;
#size-cells = <1>;
interrupt-parent = <&intc>;
chosen {
bootargs = "console=tty0 consoleblank=0";
/* this is for console on PGU */
/* bootargs = "console=tty0 consoleblank=0"; */
/* this is for console on serial */
bootargs = "earlycon=uart8250,mmio32,0xc0000000,115200n8 console=ttyS0,115200n8 consoleblank=0 debug";
};
aliases {
@ -44,15 +47,14 @@
};
uart0: serial@c0000000 {
compatible = "snps,dw-apb-uart";
compatible = "ns8250";
reg = <0xc0000000 0x2000>;
interrupts = <11>;
#clock-frequency = <80000000>;
clock-frequency = <3686400>;
baud = <115200>;
reg-shift = <2>;
reg-io-width = <4>;
status = "okay";
no-loopback-test = <1>;
};
pgu0: pgu@c9000000 {

10
arch/arc/boot/dts/skeleton.dts
View File

@ -1,10 +0,0 @@
/*
* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/dts-v1/;
/include/ "skeleton.dtsi"

1
arch/arc/configs/nsimosci_defconfig
View File

@ -54,6 +54,7 @@ CONFIG_SERIO_ARC_PS2=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_DW=y
CONFIG_SERIAL_OF_PLATFORM=y
CONFIG_SERIAL_ARC=y
CONFIG_SERIAL_ARC_CONSOLE=y
# CONFIG_HW_RANDOM is not set

14
arch/arc/include/asm/linkage.h
View File

@ -13,20 +13,6 @@
#define ASM_NL ` /* use '`' to mark new line in macro */
/* Can't use the ENTRY macro in linux/linkage.h
* gas considers ';' as comment vs. newline
*/
.macro ARC_ENTRY name
.global \name
.align 4
\name:
.endm
.macro ARC_EXIT name
#define ASM_PREV_SYM_ADDR(name) .-##name
.size \ name, ASM_PREV_SYM_ADDR(\name)
.endm
/* annotation for data we want in DCCM - if enabled in .config */
.macro ARCFP_DATA nm
#ifdef CONFIG_ARC_HAS_DCCM

2
arch/arc/kernel/ctx_sw_asm.S
View File

@ -62,4 +62,4 @@ __switch_to:
ld.ab blink, [sp, 4]
j [blink]
ARC_EXIT __switch_to
END(__switch_to)

52
arch/arc/kernel/entry.S
View File

@ -141,7 +141,7 @@ VECTOR EV_Extension ; 0x130, Extn Intruction Excp (0x26)
VECTOR reserved ; Reserved Exceptions
.endr
#include <linux/linkage.h> /* ARC_{EXTRY,EXIT} */
#include <linux/linkage.h> /* {EXTRY,EXIT} */
#include <asm/entry.h> /* SAVE_ALL_{INT1,INT2,SYS...} */
#include <asm/errno.h>
#include <asm/arcregs.h>
@ -184,7 +184,7 @@ reserved: ; processor restart
; ---------------------------------------------
; Level 2 ISR: Can interrupt a Level 1 ISR
; ---------------------------------------------
ARC_ENTRY handle_interrupt_level2
ENTRY(handle_interrupt_level2)
; TODO-vineetg for SMP this wont work
; free up r9 as scratchpad
@ -225,14 +225,14 @@ ARC_ENTRY handle_interrupt_level2
b ret_from_exception
ARC_EXIT handle_interrupt_level2
END(handle_interrupt_level2)
#endif
; ---------------------------------------------
; Level 1 ISR
; ---------------------------------------------
ARC_ENTRY handle_interrupt_level1
ENTRY(handle_interrupt_level1)
/* free up r9 as scratchpad */
#ifdef CONFIG_SMP
@ -265,7 +265,7 @@ ARC_ENTRY handle_interrupt_level1
sr r8, [AUX_IRQ_LV12] ; clear bit in Sticky Status Reg
b ret_from_exception
ARC_EXIT handle_interrupt_level1
END(handle_interrupt_level1)
;################### Non TLB Exception Handling #############################
@ -273,7 +273,7 @@ ARC_EXIT handle_interrupt_level1
; Instruction Error Exception Handler
; ---------------------------------------------
ARC_ENTRY instr_service
ENTRY(instr_service)
EXCEPTION_PROLOGUE
@ -284,13 +284,13 @@ ARC_ENTRY instr_service
bl do_insterror_or_kprobe
b ret_from_exception
ARC_EXIT instr_service
END(instr_service)
; ---------------------------------------------
; Memory Error Exception Handler
; ---------------------------------------------
ARC_ENTRY mem_service
ENTRY(mem_service)
EXCEPTION_PROLOGUE
@ -301,13 +301,13 @@ ARC_ENTRY mem_service
bl do_memory_error
b ret_from_exception
ARC_EXIT mem_service
END(mem_service)
; ---------------------------------------------
; Machine Check Exception Handler
; ---------------------------------------------
ARC_ENTRY EV_MachineCheck
ENTRY(EV_MachineCheck)
EXCEPTION_PROLOGUE
@ -331,13 +331,13 @@ ARC_ENTRY EV_MachineCheck
j do_machine_check_fault
ARC_EXIT EV_MachineCheck
END(EV_MachineCheck)
; ---------------------------------------------
; Protection Violation Exception Handler
; ---------------------------------------------
ARC_ENTRY EV_TLBProtV
ENTRY(EV_TLBProtV)
EXCEPTION_PROLOGUE
@ -385,12 +385,12 @@ ARC_ENTRY EV_TLBProtV
b ret_from_exception
ARC_EXIT EV_TLBProtV
END(EV_TLBProtV)
; ---------------------------------------------
; Privilege Violation Exception Handler
; ---------------------------------------------
ARC_ENTRY EV_PrivilegeV
ENTRY(EV_PrivilegeV)
EXCEPTION_PROLOGUE
@ -401,12 +401,12 @@ ARC_ENTRY EV_PrivilegeV
bl do_privilege_fault
b ret_from_exception
ARC_EXIT EV_PrivilegeV
END(EV_PrivilegeV)
; ---------------------------------------------
; Extension Instruction Exception Handler
; ---------------------------------------------
ARC_ENTRY EV_Extension
ENTRY(EV_Extension)
EXCEPTION_PROLOGUE
@ -417,7 +417,7 @@ ARC_ENTRY EV_Extension
bl do_extension_fault
b ret_from_exception
ARC_EXIT EV_Extension
END(EV_Extension)
;######################### System Call Tracing #########################
@ -504,7 +504,7 @@ trap_with_param:
; (2) Break Points
;------------------------------------------------------------------
ARC_ENTRY EV_Trap
ENTRY(EV_Trap)
EXCEPTION_PROLOGUE
@ -534,9 +534,9 @@ ARC_ENTRY EV_Trap
jl [r9] ; Entry into Sys Call Handler
; fall through to ret_from_system_call
ARC_EXIT EV_Trap
END(EV_Trap)
ARC_ENTRY ret_from_system_call
ENTRY(ret_from_system_call)
st r0, [sp, PT_r0] ; sys call return value in pt_regs
@ -546,7 +546,7 @@ ARC_ENTRY ret_from_system_call
;
; If ret to user mode do we need to handle signals, schedule() et al.
ARC_ENTRY ret_from_exception
ENTRY(ret_from_exception)
; Pre-{IRQ,Trap,Exception} K/U mode from pt_regs->status32
ld r8, [sp, PT_status32] ; returning to User/Kernel Mode
@ -726,9 +726,9 @@ not_level1_interrupt:
debug_marker_syscall:
rtie
ARC_EXIT ret_from_exception
END(ret_from_exception)
ARC_ENTRY ret_from_fork
ENTRY(ret_from_fork)
; when the forked child comes here from the __switch_to function
; r0 has the last task pointer.
; put last task in scheduler queue
@ -745,11 +745,11 @@ ARC_ENTRY ret_from_fork
; special case of kernel_thread entry point returning back due to
; kernel_execve() - pretend return from syscall to ret to userland
b ret_from_exception
ARC_EXIT ret_from_fork
END(ret_from_fork)
;################### Special Sys Call Wrappers ##########################
ARC_ENTRY sys_clone_wrapper
ENTRY(sys_clone_wrapper)
SAVE_CALLEE_SAVED_USER
bl @sys_clone
DISCARD_CALLEE_SAVED_USER
@ -759,7 +759,7 @@ ARC_ENTRY sys_clone_wrapper
bnz tracesys_exit
b ret_from_system_call
ARC_EXIT sys_clone_wrapper
END(sys_clone_wrapper)
#ifdef CONFIG_ARC_DW2_UNWIND
; Workaround for bug 94179 (STAR ):

7
arch/arc/kernel/head.S
View File

@ -24,13 +24,13 @@
.globl stext
stext:
;-------------------------------------------------------------------
; Don't clobber r0-r4 yet. It might have bootloader provided info
; Don't clobber r0-r2 yet. It might have bootloader provided info
;-------------------------------------------------------------------
sr @_int_vec_base_lds, [AUX_INTR_VEC_BASE]
#ifdef CONFIG_SMP
; Only Boot (Master) proceeds. Others wait in platform dependent way
; Ensure Boot (Master) proceeds. Others wait in platform dependent way
; IDENTITY Reg [ 3 2 1 0 ]
; (cpu-id) ^^^ => Zero for UP ARC700
; => #Core-ID if SMP (Master 0)
@ -39,7 +39,8 @@ stext:
; need to make sure only boot cpu takes this path.
GET_CPU_ID r5
cmp r5, 0
jnz arc_platform_smp_wait_to_boot
mov.ne r0, r5
jne arc_platform_smp_wait_to_boot
#endif
; Clear BSS before updating any globals
; XXX: use ZOL here

37
arch/arc/kernel/time.c
View File

@ -155,22 +155,6 @@ static void arc_timer_event_setup(unsigned int limit)
write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
}
/*
* Acknowledge the interrupt (oneshot) and optionally re-arm it (periodic)
* -Any write to CTRL Reg will ack the intr (NH bit: Count when not halted)
* -Rearming is done by setting the IE bit
*
* Small optimisation: Normal code would have been
* if (irq_reenable)
* CTRL_REG = (IE | NH);
* else
* CTRL_REG = NH;
* However since IE is BIT0 we can fold the branch
*/
static void arc_timer_event_ack(unsigned int irq_reenable)
{
write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | TIMER_CTRL_NH);
}
static int arc_clkevent_set_next_event(unsigned long delta,
struct clock_event_device *dev)
@ -207,10 +191,22 @@ static DEFINE_PER_CPU(struct clock_event_device, arc_clockevent_device) = {
static irqreturn_t timer_irq_handler(int irq, void *dev_id)
{
struct clock_event_device *clk = this_cpu_ptr(&arc_clockevent_device);
/*
* Note that generic IRQ core could have passed @evt for @dev_id if
* irq_set_chip_and_handler() asked for handle_percpu_devid_irq()
*/
struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device);
int irq_reenable = evt->mode == CLOCK_EVT_MODE_PERIODIC;
/*
* Any write to CTRL reg ACks the interrupt, we rewrite the
* Count when [N]ot [H]alted bit.
* And re-arm it if perioid by [I]nterrupt [E]nable bit
*/
write_aux_reg(ARC_REG_TIMER0_CTRL, irq_reenable | TIMER_CTRL_NH);
evt->event_handler(evt);
arc_timer_event_ack(clk->mode == CLOCK_EVT_MODE_PERIODIC);
clk->event_handler(clk);
return IRQ_HANDLED;
}
@ -222,9 +218,8 @@ static struct irqaction arc_timer_irq = {
/*
* Setup the local event timer for @cpu
* N.B. weak so that some exotic ARC SoCs can completely override it
*/
void __weak arc_local_timer_setup(unsigned int cpu)
void arc_local_timer_setup(unsigned int cpu)
{
struct clock_event_device *clk = &per_cpu(arc_clockevent_device, cpu);

6
arch/arc/lib/memcmp.S
View File

@ -6,7 +6,7 @@
* published by the Free Software Foundation.
*/
#include <asm/linkage.h>
#include <linux/linkage.h>
#ifdef __LITTLE_ENDIAN__
#define WORD2 r2
@ -16,7 +16,7 @@
#define SHIFT r2
#endif
ARC_ENTRY memcmp
ENTRY(memcmp)
or r12,r0,r1
asl_s r12,r12,30
sub r3,r2,1
@ -121,4 +121,4 @@ ARC_ENTRY memcmp
.Lnil:
j_s.d [blink]
mov r0,0
ARC_EXIT memcmp
END(memcmp)

6
arch/arc/lib/memcpy-700.S
View File

@ -6,9 +6,9 @@
* published by the Free Software Foundation.
*/
#include <asm/linkage.h>
#include <linux/linkage.h>
ARC_ENTRY memcpy
ENTRY(memcpy)
or r3,r0,r1
asl_s r3,r3,30
mov_s r5,r0
@ -63,4 +63,4 @@ ARC_ENTRY memcpy
.Lendbloop:
j_s.d [blink]
stb r12,[r5,0]
ARC_EXIT memcpy
END(memcpy)

10
arch/arc/lib/memset.S
View File

@ -6,11 +6,11 @@
* published by the Free Software Foundation.
*/
#include <asm/linkage.h>
#include <linux/linkage.h>
#define SMALL 7 /* Must be at least 6 to deal with alignment/loop issues. */
ARC_ENTRY memset
ENTRY(memset)
mov_s r4,r0
or r12,r0,r2
bmsk.f r12,r12,1
@ -46,14 +46,14 @@ ARC_ENTRY memset
stb.ab r1,[r4,1]
.Ltiny_end:
j_s [blink]
ARC_EXIT memset
END(memset)
; memzero: @r0 = mem, @r1 = size_t
; memset: @r0 = mem, @r1 = char, @r2 = size_t
ARC_ENTRY memzero
ENTRY(memzero)
; adjust bzero args to memset args
mov r2, r1
mov r1, 0
b memset ;tail call so need to tinker with blink
ARC_EXIT memzero
END(memzero)

6
arch/arc/lib/strchr-700.S
View File

@ -11,9 +11,9 @@
presence of the norm instruction makes it easier to operate on whole
words branch-free. */
#include <asm/linkage.h>
#include <linux/linkage.h>
ARC_ENTRY strchr
ENTRY(strchr)
extb_s r1,r1
asl r5,r1,8
bmsk r2,r0,1
@ -130,4 +130,4 @@ ARC_ENTRY strchr
j_s.d [blink]
mov.mi r0,0
#endif /* ENDIAN */
ARC_EXIT strchr
END(strchr)

6
arch/arc/lib/strcmp.S
View File

@ -13,9 +13,9 @@
source 1; however, that would increase the overhead for loop setup / finish,
and strcmp might often terminate early. */
#include <asm/linkage.h>
#include <linux/linkage.h>
ARC_ENTRY strcmp
ENTRY(strcmp)
or r2,r0,r1
bmsk_s r2,r2,1
brne r2,0,.Lcharloop
@ -93,4 +93,4 @@ ARC_ENTRY strcmp
.Lcmpend:
j_s.d [blink]
sub r0,r2,r3
ARC_EXIT strcmp
END(strcmp)

6
arch/arc/lib/strcpy-700.S
View File

@ -16,9 +16,9 @@
there, but the it is not likely to be taken often, and it
would also be likey to cost an unaligned mispredict at the next call. */
#include <asm/linkage.h>
#include <linux/linkage.h>
ARC_ENTRY strcpy
ENTRY(strcpy)
or r2,r0,r1
bmsk_s r2,r2,1
brne.d r2,0,charloop
@ -67,4 +67,4 @@ charloop:
brne.d r3,0,charloop
stb.ab r3,[r10,1]
j [blink]
ARC_EXIT strcpy
END(strcpy)

6
arch/arc/lib/strlen.S
View File

@ -6,9 +6,9 @@
* published by the Free Software Foundation.
*/
#include <asm/linkage.h>
#include <linux/linkage.h>
ARC_ENTRY strlen
ENTRY(strlen)
or r3,r0,7
ld r2,[r3,-7]
ld.a r6,[r3,-3]
@ -80,4 +80,4 @@ ARC_ENTRY strlen
.Learly_end:
b.d .Lend
sub_s.ne r1,r1,r1
ARC_EXIT strlen
END(strlen)

3
arch/arc/mm/cache_arc700.c
View File

@ -100,10 +100,9 @@
#define DC_CTRL_INV_MODE_FLUSH 0x40
#define DC_CTRL_FLUSH_STATUS 0x100
char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len)
char *arc_cache_mumbojumbo(int c, char *buf, int len)
{
int n = 0;
unsigned int c = smp_processor_id();
#define PR_CACHE(p, enb, str) \
{ \

27
arch/arc/mm/init.c
View File

@ -10,6 +10,9 @@
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/initrd.h>
#endif
#include <linux/swap.h>
#include <linux/module.h>
#include <asm/page.h>
@ -42,6 +45,24 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
}
#ifdef CONFIG_BLK_DEV_INITRD
static int __init early_initrd(char *p)
{
unsigned long start, size;
char *endp;
start = memparse(p, &endp);
if (*endp == ',') {
size = memparse(endp + 1, NULL);
initrd_start = (unsigned long)__va(start);
initrd_end = (unsigned long)__va(start + size);
}
return 0;
}
early_param("initrd", early_initrd);
#endif
/*
* First memory setup routine called from setup_arch()
* 1. setup swapper's mm @init_mm
@ -80,6 +101,12 @@ void __init setup_arch_memory(void)
memblock_reserve(CONFIG_LINUX_LINK_BASE,
__pa(_end) - CONFIG_LINUX_LINK_BASE);
#ifdef CONFIG_BLK_DEV_INITRD
/*------------- reserve initrd image -----------------------*/
if (initrd_start)
memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
#endif
memblock_dump_all();
/*-------------- node setup --------------------------------*/

10
arch/arc/mm/tlbex.S
View File

@ -260,7 +260,7 @@ ARCFP_CODE ;Fast Path Code, candidate for ICCM
; I-TLB Miss Exception Handler
;-----------------------------------------------------------------------------
ARC_ENTRY EV_TLBMissI
ENTRY(EV_TLBMissI)
TLBMISS_FREEUP_REGS
@ -293,13 +293,13 @@ ARC_ENTRY EV_TLBMissI
TLBMISS_RESTORE_REGS
rtie
ARC_EXIT EV_TLBMissI
END(EV_TLBMissI)
;-----------------------------------------------------------------------------
; D-TLB Miss Exception Handler
;-----------------------------------------------------------------------------
ARC_ENTRY EV_TLBMissD
ENTRY(EV_TLBMissD)
TLBMISS_FREEUP_REGS
@ -381,6 +381,4 @@ do_slow_path_pf:
bl do_page_fault
b ret_from_exception
ARC_EXIT EV_TLBMissD
ARC_ENTRY EV_TLBMissB ; Bogus entry to measure sz of DTLBMiss hdlr
END(EV_TLBMissD)

1
arch/arc/plat-arcfpga/Kconfig
View File

@ -33,7 +33,6 @@ config ISS_SMP_EXTN
bool "ARC SMP Extensions (ISS Models only)"
default n
depends on SMP
select ARC_HAS_COH_RTSC
help
SMP Extensions to ARC700, in a "simulation only" Model, supported in
ARC ISS (Instruction Set Simulator).

6
arch/arc/plat-arcfpga/platform.c
View File

@ -201,7 +201,7 @@ static void __init plat_fpga_populate_dev(void)
* callback set, by matching the DT compatible name.
*/
static const char *aa4_compat[] __initdata = {
static const char *aa4_compat[] __initconst = {
"snps,arc-angel4",
NULL,
};
@ -216,7 +216,7 @@ MACHINE_START(ANGEL4, "angel4")
#endif
MACHINE_END
static const char *ml509_compat[] __initdata = {
static const char *ml509_compat[] __initconst = {
"snps,arc-ml509",
NULL,
};
@ -231,7 +231,7 @@ MACHINE_START(ML509, "ml509")
#endif
MACHINE_END
static const char *nsimosci_compat[] __initdata = {
static const char *nsimosci_compat[] __initconst = {
"snps,nsimosci",
NULL,
};