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OMAP4: AuxCoreBoot registers only accessible in secure mode 

The AuxCoreBoot0 and AuxCoreBoot1 can be only accessed in secure
mode. Replace the current code with secure monitor API's to access/modify
these registers.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Santosh Shilimkar 2009-12-11 16:16:35 -08:00 committed by Tony Lindgren
parent a7c3ae2cb6
commit 942e2c9e52
3 changed files with 37 additions and 24 deletions
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35
arch/arm/mach-omap2/omap-headsmp.S
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@ -27,20 +27,39 @@
* OMAP4 specific entry point for secondary CPU to jump from ROM
* code. This routine also provides a holding flag into which
* secondary core is held until we're ready for it to initialise.
* The primary core will update the this flag using a hardware
* register AuxCoreBoot1.
* The primary core will update this flag using a hardware
* register AuxCoreBoot0.
*/
ENTRY(omap_secondary_startup)
mrc p15, 0, r0, c0, c0, 5
and r0, r0, #0x0f
hold: ldr r1, =OMAP4_AUX_CORE_BOOT1_PA @ read from AuxCoreBoot1
ldr r2, [r1]
cmp r2, r0
hold: ldr r12,=0x103
dsb
smc @ read from AuxCoreBoot0
mov r0, r0, lsr #9
mrc p15, 0, r4, c0, c0, 5
and r4, r4, #0x0f
cmp r0, r4
bne hold
/*
* we've been released from the cpu_release,secondary_stack
* we've been released from the wait loop,secondary_stack
* should now contain the SVC stack for this core
*/
b secondary_startup
END(omap_secondary_startup)
ENTRY(omap_modify_auxcoreboot0)
stmfd sp!, {r1-r12, lr}
ldr r12, =0x104
dsb
smc
ldmfd sp!, {r1-r12, pc}
END(omap_modify_auxcoreboot0)
ENTRY(omap_auxcoreboot_addr)
stmfd sp!, {r2-r12, lr}
ldr r12, =0x105
dsb
smc
ldmfd sp!, {r2-r12, pc}
END(omap_auxcoreboot_addr)

24
arch/arm/mach-omap2/omap-smp.c
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@ -21,15 +21,12 @@
#include <linux/smp.h>
#include <linux/io.h>
#include <asm/cacheflush.h>
#include <asm/localtimer.h>
#include <asm/smp_scu.h>
#include <mach/hardware.h>
#include <plat/common.h>
/* Registers used for communicating startup information */
static void __iomem *omap4_auxcoreboot_reg0;
static void __iomem *omap4_auxcoreboot_reg1;
/* SCU base address */
static void __iomem *scu_base;
@ -74,12 +71,13 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
spin_lock(&boot_lock);
/*
* Update the AuxCoreBoot1 with boot state for secondary core.
* Update the AuxCoreBoot0 with boot state for secondary core.
* omap_secondary_startup() routine will hold the secondary core till
* the AuxCoreBoot1 register is updated with cpu state
* A barrier is added to ensure that write buffer is drained
*/
__raw_writel(cpu, omap4_auxcoreboot_reg1);
omap_modify_auxcoreboot0(0x200, 0x0);
flush_cache_all();
smp_wmb();
timeout = jiffies + (1 * HZ);
@ -99,17 +97,18 @@ static void __init wakeup_secondary(void)
{
/*
* Write the address of secondary startup routine into the
* AuxCoreBoot0 where ROM code will jump and start executing
* AuxCoreBoot1 where ROM code will jump and start executing
* on secondary core once out of WFE
* A barrier is added to ensure that write buffer is drained
*/
__raw_writel(virt_to_phys(omap_secondary_startup), \
omap4_auxcoreboot_reg0);
omap_auxcoreboot_addr(virt_to_phys(omap_secondary_startup));
smp_wmb();
/*
* Send a 'sev' to wake the secondary core from WFE.
* Drain the outstanding writes to memory
*/
dsb();
set_event();
mb();
}
@ -136,7 +135,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int ncores = get_core_count();
unsigned int cpu = smp_processor_id();
void __iomem *omap4_wkupgen_base;
int i;
/* sanity check */
@ -168,12 +166,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
/* Never released */
omap4_wkupgen_base = ioremap(OMAP44XX_WKUPGEN_BASE, SZ_4K);
BUG_ON(!omap4_wkupgen_base);
omap4_auxcoreboot_reg0 = omap4_wkupgen_base + 0x800;
omap4_auxcoreboot_reg1 = omap4_wkupgen_base + 0x804;
if (max_cpus > 1) {
/*
* Enable the local timer or broadcast device for the

2
arch/arm/plat-omap/include/plat/smp.h
View File

@ -28,6 +28,8 @@
/* Needed for secondary core boot */
extern void omap_secondary_startup(void);
extern u32 omap_modify_auxcoreboot0(u32 set_mask, u32 clear_mask);
extern void omap_auxcoreboot_addr(u32 cpu_addr);
/*
* We use Soft IRQ1 as the IPI