02629d8f87
Targets were build tested and patches are refreshed. Signed-off-by: Luka Perkov <luka@openwrt.org> SVN-Revision: 42463
212 lines
5.8 KiB
Diff
212 lines
5.8 KiB
Diff
From 18d53dfa103e63154fb8e548d55016d6ad210d28 Mon Sep 17 00:00:00 2001
|
|
From: Rohit Vaswani <rvaswani@codeaurora.org>
|
|
Date: Fri, 21 Jun 2013 12:17:37 -0700
|
|
Subject: [PATCH 002/182] ARM: msm: Remove pen_release usage
|
|
|
|
pen_release is no longer required as the synchronization
|
|
is now managed by generic arm code.
|
|
This is done as suggested in https://lkml.org/lkml/2013/6/4/184
|
|
|
|
Cc: Russell King <linux@arm.linux.org.uk>
|
|
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
|
|
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
|
|
Signed-off-by: Kumar Gala <galak@codeaurora.org>
|
|
---
|
|
arch/arm/mach-msm/Makefile | 2 +-
|
|
arch/arm/mach-msm/headsmp.S | 39 ---------------------------------------
|
|
arch/arm/mach-msm/hotplug.c | 31 ++++---------------------------
|
|
arch/arm/mach-msm/platsmp.c | 37 +++----------------------------------
|
|
4 files changed, 8 insertions(+), 101 deletions(-)
|
|
delete mode 100644 arch/arm/mach-msm/headsmp.S
|
|
|
|
--- a/arch/arm/mach-msm/Makefile
|
|
+++ b/arch/arm/mach-msm/Makefile
|
|
@@ -19,7 +19,7 @@ obj-$(CONFIG_MSM_SCM) += scm.o scm-boot.
|
|
CFLAGS_scm.o :=$(call as-instr,.arch_extension sec,-DREQUIRES_SEC=1)
|
|
|
|
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
|
|
-obj-$(CONFIG_SMP) += headsmp.o platsmp.o
|
|
+obj-$(CONFIG_SMP) += platsmp.o
|
|
|
|
obj-$(CONFIG_MACH_TROUT) += board-trout.o board-trout-gpio.o board-trout-mmc.o devices-msm7x00.o
|
|
obj-$(CONFIG_MACH_TROUT) += board-trout.o board-trout-gpio.o board-trout-mmc.o board-trout-panel.o devices-msm7x00.o
|
|
--- a/arch/arm/mach-msm/headsmp.S
|
|
+++ /dev/null
|
|
@@ -1,39 +0,0 @@
|
|
-/*
|
|
- * linux/arch/arm/mach-realview/headsmp.S
|
|
- *
|
|
- * Copyright (c) 2003 ARM Limited
|
|
- * All Rights Reserved
|
|
- *
|
|
- * 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.
|
|
- */
|
|
-#include <linux/linkage.h>
|
|
-#include <linux/init.h>
|
|
-
|
|
-/*
|
|
- * MSM specific entry point for secondary CPUs. This provides
|
|
- * a "holding pen" into which all secondary cores are held until we're
|
|
- * ready for them to initialise.
|
|
- */
|
|
-ENTRY(msm_secondary_startup)
|
|
- mrc p15, 0, r0, c0, c0, 5
|
|
- and r0, r0, #15
|
|
- adr r4, 1f
|
|
- ldmia r4, {r5, r6}
|
|
- sub r4, r4, r5
|
|
- add r6, r6, r4
|
|
-pen: ldr r7, [r6]
|
|
- cmp r7, r0
|
|
- bne pen
|
|
-
|
|
- /*
|
|
- * we've been released from the holding pen: secondary_stack
|
|
- * should now contain the SVC stack for this core
|
|
- */
|
|
- b secondary_startup
|
|
-ENDPROC(msm_secondary_startup)
|
|
-
|
|
- .align
|
|
-1: .long .
|
|
- .long pen_release
|
|
--- a/arch/arm/mach-msm/hotplug.c
|
|
+++ b/arch/arm/mach-msm/hotplug.c
|
|
@@ -24,33 +24,10 @@ static inline void cpu_leave_lowpower(vo
|
|
|
|
static inline void platform_do_lowpower(unsigned int cpu)
|
|
{
|
|
- /* Just enter wfi for now. TODO: Properly shut off the cpu. */
|
|
- for (;;) {
|
|
- /*
|
|
- * here's the WFI
|
|
- */
|
|
- asm("wfi"
|
|
- :
|
|
- :
|
|
- : "memory", "cc");
|
|
-
|
|
- if (pen_release == cpu_logical_map(cpu)) {
|
|
- /*
|
|
- * OK, proper wakeup, we're done
|
|
- */
|
|
- break;
|
|
- }
|
|
-
|
|
- /*
|
|
- * getting here, means that we have come out of WFI without
|
|
- * having been woken up - this shouldn't happen
|
|
- *
|
|
- * The trouble is, letting people know about this is not really
|
|
- * possible, since we are currently running incoherently, and
|
|
- * therefore cannot safely call printk() or anything else
|
|
- */
|
|
- pr_debug("CPU%u: spurious wakeup call\n", cpu);
|
|
- }
|
|
+ asm("wfi"
|
|
+ :
|
|
+ :
|
|
+ : "memory", "cc");
|
|
}
|
|
|
|
/*
|
|
--- a/arch/arm/mach-msm/platsmp.c
|
|
+++ b/arch/arm/mach-msm/platsmp.c
|
|
@@ -12,13 +12,10 @@
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
-#include <linux/jiffies.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/io.h>
|
|
|
|
-#include <asm/cacheflush.h>
|
|
#include <asm/cputype.h>
|
|
-#include <asm/mach-types.h>
|
|
#include <asm/smp_plat.h>
|
|
|
|
#include "scm-boot.h"
|
|
@@ -28,7 +25,7 @@
|
|
#define SCSS_CPU1CORE_RESET 0xD80
|
|
#define SCSS_DBG_STATUS_CORE_PWRDUP 0xE64
|
|
|
|
-extern void msm_secondary_startup(void);
|
|
+extern void secondary_startup(void);
|
|
|
|
static DEFINE_SPINLOCK(boot_lock);
|
|
|
|
@@ -41,13 +38,6 @@ static inline int get_core_count(void)
|
|
static void msm_secondary_init(unsigned int cpu)
|
|
{
|
|
/*
|
|
- * let the primary processor know we're out of the
|
|
- * pen, then head off into the C entry point
|
|
- */
|
|
- pen_release = -1;
|
|
- smp_wmb();
|
|
-
|
|
- /*
|
|
* Synchronise with the boot thread.
|
|
*/
|
|
spin_lock(&boot_lock);
|
|
@@ -57,7 +47,7 @@ static void msm_secondary_init(unsigned
|
|
static void prepare_cold_cpu(unsigned int cpu)
|
|
{
|
|
int ret;
|
|
- ret = scm_set_boot_addr(virt_to_phys(msm_secondary_startup),
|
|
+ ret = scm_set_boot_addr(virt_to_phys(secondary_startup),
|
|
SCM_FLAG_COLDBOOT_CPU1);
|
|
if (ret == 0) {
|
|
void __iomem *sc1_base_ptr;
|
|
@@ -75,7 +65,6 @@ static void prepare_cold_cpu(unsigned in
|
|
|
|
static int msm_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
- unsigned long timeout;
|
|
static int cold_boot_done;
|
|
|
|
/* Only need to bring cpu out of reset this way once */
|
|
@@ -91,39 +80,19 @@ static int msm_boot_secondary(unsigned i
|
|
spin_lock(&boot_lock);
|
|
|
|
/*
|
|
- * The secondary processor is waiting to be released from
|
|
- * the holding pen - release it, then wait for it to flag
|
|
- * that it has been released by resetting pen_release.
|
|
- *
|
|
- * Note that "pen_release" is the hardware CPU ID, whereas
|
|
- * "cpu" is Linux's internal ID.
|
|
- */
|
|
- pen_release = cpu_logical_map(cpu);
|
|
- sync_cache_w(&pen_release);
|
|
-
|
|
- /*
|
|
* Send the secondary CPU a soft interrupt, thereby causing
|
|
* the boot monitor to read the system wide flags register,
|
|
* and branch to the address found there.
|
|
*/
|
|
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
|
|
|
|
- timeout = jiffies + (1 * HZ);
|
|
- while (time_before(jiffies, timeout)) {
|
|
- smp_rmb();
|
|
- if (pen_release == -1)
|
|
- break;
|
|
-
|
|
- udelay(10);
|
|
- }
|
|
-
|
|
/*
|
|
* now the secondary core is starting up let it run its
|
|
* calibrations, then wait for it to finish
|
|
*/
|
|
spin_unlock(&boot_lock);
|
|
|
|
- return pen_release != -1 ? -ENOSYS : 0;
|
|
+ return 0;
|
|
}
|
|
|
|
/*
|