* [PATCH] ARM: OMAP2+: wakeupgen: AM43x adaptation
@ 2013-09-05 10:55 Afzal Mohammed
2013-10-08 21:24 ` Tony Lindgren
0 siblings, 1 reply; 3+ messages in thread
From: Afzal Mohammed @ 2013-09-05 10:55 UTC (permalink / raw)
To: linux-arm-kernel
AM43x has 224 interrupts and 7 banks, make it as maximum values. Keep
default values as earlier, if am43x is detected, update interrupts and
banks to maximum.
Also AM43x has only one cpu, ensure that clearing bitmask at wakeupgen
is done only for the single existing cpu, existing code assumes that
there are two cpu's.
If bitmask is cleared in wakeupgen for the nonexistent second cpu,
an imprecise abort happens as soon as Kernel switches to user space.
It was rootcaused by Sekhar Nori <nsekhar@ti.com>.
Signed-off-by: Afzal Mohammed <afzal@ti.com>
---
arch/arm/mach-omap2/omap-wakeupgen.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/arm/mach-omap2/omap-wakeupgen.c b/arch/arm/mach-omap2/omap-wakeupgen.c
index 813c615..899d4946 100644
--- a/arch/arm/mach-omap2/omap-wakeupgen.c
+++ b/arch/arm/mach-omap2/omap-wakeupgen.c
@@ -33,8 +33,11 @@
#include "omap4-sar-layout.h"
#include "common.h"
-#define MAX_NR_REG_BANKS 5
-#define MAX_IRQS 160
+/* maximum value correspond to that of AM43x */
+#define MAX_NR_REG_BANKS 7
+#define MAX_IRQS 224
+#define DEFAULT_NR_REG_BANKS 5
+#define DEFAULT_IRQS 160
#define WKG_MASK_ALL 0x00000000
#define WKG_UNMASK_ALL 0xffffffff
#define CPU_ENA_OFFSET 0x400
@@ -47,8 +50,8 @@ static void __iomem *wakeupgen_base;
static void __iomem *sar_base;
static DEFINE_RAW_SPINLOCK(wakeupgen_lock);
static unsigned int irq_target_cpu[MAX_IRQS];
-static unsigned int irq_banks = MAX_NR_REG_BANKS;
-static unsigned int max_irqs = MAX_IRQS;
+static unsigned int irq_banks = DEFAULT_NR_REG_BANKS;
+static unsigned int max_irqs = DEFAULT_IRQS;
static unsigned int omap_secure_apis;
/*
@@ -402,6 +405,7 @@ int __init omap_wakeupgen_init(void)
{
int i;
unsigned int boot_cpu = smp_processor_id();
+ bool am43x = soc_is_am43xx() ? true : false;
/* Not supported on OMAP4 ES1.0 silicon */
if (omap_rev() == OMAP4430_REV_ES1_0) {
@@ -418,12 +422,16 @@ int __init omap_wakeupgen_init(void)
irq_banks = OMAP4_NR_BANKS;
max_irqs = OMAP4_NR_IRQS;
omap_secure_apis = 1;
+ } else if (am43x) {
+ irq_banks = MAX_NR_REG_BANKS;
+ max_irqs = MAX_IRQS;
}
/* Clear all IRQ bitmasks at wakeupGen level */
for (i = 0; i < irq_banks; i++) {
wakeupgen_writel(0, i, CPU0_ID);
- wakeupgen_writel(0, i, CPU1_ID);
+ if (!am43x)
+ wakeupgen_writel(0, i, CPU1_ID);
}
/*
--
1.8.3.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH] ARM: OMAP2+: wakeupgen: AM43x adaptation
2013-09-05 10:55 [PATCH] ARM: OMAP2+: wakeupgen: AM43x adaptation Afzal Mohammed
@ 2013-10-08 21:24 ` Tony Lindgren
2013-10-09 7:22 ` Afzal Mohammed
0 siblings, 1 reply; 3+ messages in thread
From: Tony Lindgren @ 2013-10-08 21:24 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
Few minor comments below.
* Afzal Mohammed <afzal@ti.com> [130905 04:03]:
> AM43x has 224 interrupts and 7 banks, make it as maximum values. Keep
> default values as earlier, if am43x is detected, update interrupts and
> banks to maximum.
>
> Also AM43x has only one cpu, ensure that clearing bitmask at wakeupgen
> is done only for the single existing cpu, existing code assumes that
> there are two cpu's.
>
> If bitmask is cleared in wakeupgen for the nonexistent second cpu,
> an imprecise abort happens as soon as Kernel switches to user space.
> It was rootcaused by Sekhar Nori <nsekhar@ti.com>.
>
> Signed-off-by: Afzal Mohammed <afzal@ti.com>
> ---
> arch/arm/mach-omap2/omap-wakeupgen.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/omap-wakeupgen.c b/arch/arm/mach-omap2/omap-wakeupgen.c
> index 813c615..899d4946 100644
> --- a/arch/arm/mach-omap2/omap-wakeupgen.c
> +++ b/arch/arm/mach-omap2/omap-wakeupgen.c
> @@ -33,8 +33,11 @@
> #include "omap4-sar-layout.h"
> #include "common.h"
>
> -#define MAX_NR_REG_BANKS 5
> -#define MAX_IRQS 160
> +/* maximum value correspond to that of AM43x */
> +#define MAX_NR_REG_BANKS 7
> +#define MAX_IRQS 224
> +#define DEFAULT_NR_REG_BANKS 5
> +#define DEFAULT_IRQS 160
> #define WKG_MASK_ALL 0x00000000
> #define WKG_UNMASK_ALL 0xffffffff
> #define CPU_ENA_OFFSET 0x400
How about define it like this to avoid updating things
in multiple places for new SoCs:
#define AM43X_NR_REG_BANKS 7
#define MAX_NR_REG_BANKS AM43X_NR_REG_BANKS
...
> @@ -402,6 +405,7 @@ int __init omap_wakeupgen_init(void)
> {
> int i;
> unsigned int boot_cpu = smp_processor_id();
> + bool am43x = soc_is_am43xx() ? true : false;
>
> /* Not supported on OMAP4 ES1.0 silicon */
> if (omap_rev() == OMAP4430_REV_ES1_0) {
> @@ -418,12 +422,16 @@ int __init omap_wakeupgen_init(void)
> irq_banks = OMAP4_NR_BANKS;
> max_irqs = OMAP4_NR_IRQS;
> omap_secure_apis = 1;
> + } else if (am43x) {
> + irq_banks = MAX_NR_REG_BANKS;
> + max_irqs = MAX_IRQS;
> }
Then here you can have:
irq_bankse = AM43X_NR_REG_BANKS
...
> /* Clear all IRQ bitmasks at wakeupGen level */
> for (i = 0; i < irq_banks; i++) {
> wakeupgen_writel(0, i, CPU0_ID);
> - wakeupgen_writel(0, i, CPU1_ID);
> + if (!am43x)
> + wakeupgen_writel(0, i, CPU1_ID);
> }
Why not use soc_is_am43xx() directly here?
Regards,
Tony
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH] ARM: OMAP2+: wakeupgen: AM43x adaptation
2013-10-08 21:24 ` Tony Lindgren
@ 2013-10-09 7:22 ` Afzal Mohammed
0 siblings, 0 replies; 3+ messages in thread
From: Afzal Mohammed @ 2013-10-09 7:22 UTC (permalink / raw)
To: linux-arm-kernel
Hi Tony,
On Wednesday 09 October 2013 02:54 AM, Tony Lindgren wrote:
> * Afzal Mohammed <afzal@ti.com> [130905 04:03]:
>> -#define MAX_NR_REG_BANKS 5
>> -#define MAX_IRQS 160
>> +/* maximum value correspond to that of AM43x */
>> +#define MAX_NR_REG_BANKS 7
>> +#define MAX_IRQS 224
>> +#define DEFAULT_NR_REG_BANKS 5
>> +#define DEFAULT_IRQS 160
>> #define WKG_MASK_ALL 0x00000000
>> #define WKG_UNMASK_ALL 0xffffffff
>> #define CPU_ENA_OFFSET 0x400
>
> How about define it like this to avoid updating things
> in multiple places for new SoCs:
>
> #define AM43X_NR_REG_BANKS 7
> #define MAX_NR_REG_BANKS AM43X_NR_REG_BANKS
Yes that is better
>> for (i = 0; i < irq_banks; i++) {
>> wakeupgen_writel(0, i, CPU0_ID);
>> - wakeupgen_writel(0, i, CPU1_ID);
>> + if (!am43x)
>> + wakeupgen_writel(0, i, CPU1_ID);
>> }
>
> Why not use soc_is_am43xx() directly here?
Ok, it has been changed in the new version.
Regards
Afzal
^ permalink raw reply [flat|nested] 3+ messages in thread
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2013-10-08 21:24 ` Tony Lindgren
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