| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 22 Feb 2011 11:17:42 +0100
From: Peppe CAVALLARO <peppe.cavallaro@...com>
To: "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc: Stuart MENEFY <stuart.menefy@...com>,
Peppe CAVALLARO <peppe.cavallaro@...com>
Subject: [PATCH (sh-2.6) 2/4] sh_timer: add the support to use the generic
timer
Add the support to register and use a TMU channel as
generic timer. For example the stmmac network device
driver, on STM platforms, uses the TMU channel 2 for
mitigating the number of interrupts.
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
Signed-off-by: Stuart Menefy <stuart.menefy@...com>
---
drivers/clocksource/sh_tmu.c | 72 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 36aba99..8199556 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -29,6 +29,7 @@
#include <linux/err.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
+#include <linux/generictimer.h>
#include <linux/sh_timer.h>
#include <linux/slab.h>
@@ -41,6 +42,7 @@ struct sh_tmu_priv {
unsigned long periodic;
struct clock_event_device ced;
struct clocksource cs;
+ struct generic_timer gt;
};
static DEFINE_SPINLOCK(sh_tmu_lock);
@@ -184,6 +186,74 @@ static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static struct sh_tmu_priv *gt_to_sh_tmu(struct generic_timer *gt)
+{
+ return container_of(gt, struct sh_tmu_priv, gt);
+}
+
+static void sh_tmu_generic_timer_start(struct generic_timer *gt)
+{
+ struct sh_tmu_priv *p = gt_to_sh_tmu(gt);
+
+ sh_tmu_write(p, TCR, 0x0020);
+ sh_tmu_start_stop_ch(p, 1);
+}
+
+static void sh_tmu_generic_timer_stop(struct generic_timer *gt)
+{
+ struct sh_tmu_priv *p = gt_to_sh_tmu(gt);
+
+ sh_tmu_start_stop_ch(p, 0);
+ sh_tmu_write(p, TCR, 0x0000);
+}
+
+static void sh_tmu_generic_timer_set_rate(struct generic_timer *gt,
+ unsigned long rate)
+{
+ struct sh_tmu_priv *p = gt_to_sh_tmu(gt);
+
+ sh_tmu_enable(p);
+ p->periodic = p->rate / rate;
+ sh_tmu_set_next(p, p->periodic, 1);
+}
+
+static irqreturn_t sh_tmu_generic_timer_interrupt(int irq, void *dev_id)
+{
+ struct sh_tmu_priv *p = dev_id;
+
+ sh_tmu_write(p, TCR, 0x0020);
+
+ p->gt.priv_handler(p->gt.data);
+ return IRQ_HANDLED;
+}
+
+static void sh_tmu_register_generic_timer(struct sh_tmu_priv *p, char *name)
+{
+ struct generic_timer *gt = &p->gt;
+ int ret;
+
+ gt->name = name;
+ gt->timer_start = sh_tmu_generic_timer_start;
+ gt->timer_stop = sh_tmu_generic_timer_stop;
+ gt->set_rate = sh_tmu_generic_timer_set_rate;
+
+ p->irqaction.handler = sh_tmu_generic_timer_interrupt;
+
+ ret = setup_irq(p->irqaction.irq, &p->irqaction);
+ if (unlikely(ret)) {
+ dev_err(&p->pdev->dev, "failed to request irq %d\n",
+ p->irqaction.irq);
+ return;
+ }
+
+ sh_tmu_generic_timer_stop(gt);
+ sh_tmu_write(p, TCOR, 0xffffffff);
+ sh_tmu_write(p, TCNT, 0xffffffff);
+
+ dev_info(&p->pdev->dev, "used for generic timer\n");
+ generic_timer_register_device(gt);
+}
+
static struct sh_tmu_priv *cs_to_sh_tmu(struct clocksource *cs)
{
return container_of(cs, struct sh_tmu_priv, cs);
@@ -342,6 +412,8 @@ static int sh_tmu_register(struct sh_tmu_priv *p, char *name,
sh_tmu_register_clockevent(p, name, clockevent_rating);
else if (clocksource_rating)
sh_tmu_register_clocksource(p, name, clocksource_rating);
+ else
+ sh_tmu_register_generic_timer(p, name);
return 0;
}
--
1.7.4
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists