linux-omap2 git: update to latest git, add Pauls latest serial hang patch set

6 files changed, 61 insertions, 328 deletions

diff --git a/packages/linux/linux-omap2-git/beagleboard/01-gptimer_clear_isrs_on_init b/packages/linux/linux-omap2-git/beagleboard/01-gptimer_clear_isrs_on_init
deleted file mode 100644
index 5123bafe54..0000000000
--- a/packages/linux/linux-omap2-git/beagleboard/01-gptimer_clear_isrs_on_init
+++ /dev/null
@@ -1,25 +0,0 @@
-clear
-
-From: Paul Walmsley <paul@pwsan.com>
-
-
----
-
- arch/arm/plat-omap/dmtimer.c |    4 ++++
- 1 files changed, 4 insertions(+), 0 deletions(-)
-
-diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
-index f22506a..e38a11e 100644
---- a/arch/arm/plat-omap/dmtimer.c
-+++ b/arch/arm/plat-omap/dmtimer.c
-@@ -703,6 +703,10 @@ int __init omap_dm_timer_init(void)
- 			timer->fclk = clk_get(NULL, clk_name);
- 		}
- #endif
-+		omap_dm_timer_write_status(timer, OMAP_TIMER_INT_OVERFLOW |
-+					   OMAP_TIMER_INT_MATCH | 
-+					   OMAP_TIMER_INT_CAPTURE);
-+
- 	}
- 
- 	return 0;
diff --git a/packages/linux/linux-omap2-git/beagleboard/01-make_tick_gptimer_configurable b/packages/linux/linux-omap2-git/beagleboard/01-make_tick_gptimer_configurable
new file mode 100644
index 0000000000..bcf0fa79f8
--- /dev/null
+++ b/packages/linux/linux-omap2-git/beagleboard/01-make_tick_gptimer_configurable
@@ -0,0 +1,58 @@
+OMAP2/3 GPTIMER: allow system tick GPTIMER to be configurable at build
+
+From: Paul Walmsley <paul@pwsan.com>
+
+Add Kbuild code to allow the builder to select which GPTIMER block to use
+for the Linux clockevents timer.  Practical choices at this point are
+GPTIMER1 or GPTIMER12.  Both of these timers are in the WKUP powerdomain,
+and so are unaffected by chip power management.  GPTIMER1 can use sys_clk
+as a source, for applications where a high-resolution timer is more important
+than power management.  GPTIMER12 has the special property that it has
+the secure 32kHz oscillator as its source clock, which may be less prone
+to glitches than the off-chip 32kHz oscillator.
+
+At this point, it appears that most boards are fine with GPTIMER1,
+but Beagle should use GPTIMER12.
+---
+
+ arch/arm/mach-omap2/Kconfig    |   16 ++++++++++++++++
+ arch/arm/mach-omap2/timer-gp.c |    2 +-
+ 2 files changed, 17 insertions(+), 1 deletions(-)
+
+diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
+index bb6d695..0002cb6 100644
+--- a/arch/arm/mach-omap2/Kconfig
++++ b/arch/arm/mach-omap2/Kconfig
+@@ -122,3 +122,19 @@ config MACH_OMAP3EVM
+ config MACH_OMAP3_BEAGLE
+ 	bool "OMAP3 BEAGLE board"
+ 	depends on ARCH_OMAP3 && ARCH_OMAP34XX
++
++config OMAP_TICK_GPTIMER
++	int "GPTIMER used for system tick timer"
++	depends on ARCH_OMAP2 || ARCH_OMAP3
++	range 1 12
++	default 1
++	help
++	  Linux uses one of the twelve on-board OMAP GPTIMER blocks to generate
++	  system tick interrupts.  The twelve GPTIMERs have slightly
++	  different powerdomain, source clock, and security properties
++	  (mostly documented in the OMAP3 TRMs) that can affect the selection
++	  of which GPTIMER to use.  The historical default is GPTIMER1.
++	  If CONFIG_OMAP_32K_TIMER is selected, Beagle may require GPTIMER12 
++	  due to hardware sensitivity to glitches on the OMAP 32kHz clock
++	  input. 
++
+diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
+index 557603f..ec80af5 100644
+--- a/arch/arm/mach-omap2/timer-gp.c
++++ b/arch/arm/mach-omap2/timer-gp.c
+@@ -99,7 +99,7 @@ static void __init omap2_gp_clockevent_init(void)
+ {
+ 	u32 tick_rate;
+ 
+-	gptimer = omap_dm_timer_request_specific(1);
++	gptimer = omap_dm_timer_request_specific(CONFIG_OMAP_TICK_GPTIMER);
+ 	BUG_ON(gptimer == NULL);
+ 
+ #if defined(CONFIG_OMAP_32K_TIMER)
diff --git a/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick b/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick
deleted file mode 100644
index 6eb6c9b477..0000000000
--- a/packages/linux/linux-omap2-git/beagleboard/02-gptimer_use_match_for_tick
+++ /dev/null
@@ -1,97 +0,0 @@
-OMAP2/3 system tick GPTIMER: use match interrupts rather than overflow interrupts
-
-From: Paul Walmsley <paul@pwsan.com>
-
-On some OMAP3 chips, GPTIMER1 will occasionally decline to interrupt
-the MPU when a timer overflow event occurs.  The timer stops running;
-and TOCR is sometimes incremented; but the MPU apparently never receives
-the interrupt.  This patch was an experiment in using the GPTIMER
-match interrupt to determine if it resolves the problem.
-Unfortunately, it does not; the same problem occurs with match
-interrupts; but this patch is preserved as the base for a
-match+overflow interrupt workaround used in a following patch.
----
-
- arch/arm/mach-omap2/timer-gp.c |   32 ++++++++++----------------------
- 1 files changed, 10 insertions(+), 22 deletions(-)
-
-diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
-index 557603f..51996ba 100644
---- a/arch/arm/mach-omap2/timer-gp.c
-+++ b/arch/arm/mach-omap2/timer-gp.c
-@@ -36,6 +36,8 @@
- #include <asm/mach/time.h>
- #include <asm/arch/dmtimer.h>
- 
-+#define GPTIMER_MATCH_VAL      0xffff0000
-+
- static struct omap_dm_timer *gptimer;
- static struct clock_event_device clockevent_gpt;
- 
-@@ -44,7 +46,7 @@ static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
- 	struct omap_dm_timer *gpt = (struct omap_dm_timer *)dev_id;
- 	struct clock_event_device *evt = &clockevent_gpt;
- 
--	omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_OVERFLOW);
-+	omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_MATCH);
- 
- 	evt->event_handler(evt);
- 	return IRQ_HANDLED;
-@@ -59,7 +61,7 @@ static struct irqaction omap2_gp_timer_irq = {
- static int omap2_gp_timer_set_next_event(unsigned long cycles,
- 					 struct clock_event_device *evt)
- {
--	omap_dm_timer_set_load_start(gptimer, 0, 0xffffffff - cycles);
-+	omap_dm_timer_set_load_start(gptimer, 0, GPTIMER_MATCH_VAL - cycles);
- 
- 	return 0;
- }
-@@ -67,29 +69,12 @@ static int omap2_gp_timer_set_next_event(unsigned long cycles,
- static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
- 				    struct clock_event_device *evt)
- {
--	u32 period;
--
- 	omap_dm_timer_stop(gptimer);
--
--	switch (mode) {
--	case CLOCK_EVT_MODE_PERIODIC:
--		period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ;
--		period -= 1;
--
--		omap_dm_timer_set_load_start(gptimer, 1, 0xffffffff - period);
--		break;
--	case CLOCK_EVT_MODE_ONESHOT:
--		break;
--	case CLOCK_EVT_MODE_UNUSED:
--	case CLOCK_EVT_MODE_SHUTDOWN:
--	case CLOCK_EVT_MODE_RESUME:
--		break;
--	}
- }
- 
- static struct clock_event_device clockevent_gpt = {
- 	.name		= "gp timer",
--	.features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-+	.features	= CLOCK_EVT_FEAT_ONESHOT,
- 	.shift		= 32,
- 	.set_next_event	= omap2_gp_timer_set_next_event,
- 	.set_mode	= omap2_gp_timer_set_mode,
-@@ -111,12 +96,15 @@ static void __init omap2_gp_clockevent_init(void)
- 
- 	omap2_gp_timer_irq.dev_id = (void *)gptimer;
- 	setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq);
--	omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW);
-+	omap_dm_timer_stop(gptimer);
-+	/*	omap_dm_timer_set_load(gptimer, 0, 0);*/
-+	omap_dm_timer_set_match(gptimer, 1, GPTIMER_MATCH_VAL);
-+	omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_MATCH);
- 
- 	clockevent_gpt.mult = div_sc(tick_rate, NSEC_PER_SEC,
- 				     clockevent_gpt.shift);
- 	clockevent_gpt.max_delta_ns =
--		clockevent_delta2ns(0xffffffff, &clockevent_gpt);
-+		clockevent_delta2ns(GPTIMER_MATCH_VAL, &clockevent_gpt);
- 	clockevent_gpt.min_delta_ns =
- 		clockevent_delta2ns(1, &clockevent_gpt);
- 
diff --git a/packages/linux/linux-omap2-git/beagleboard/03-gptimer_match_plus_ovf b/packages/linux/linux-omap2-git/beagleboard/03-gptimer_match_plus_ovf
deleted file mode 100644
index 3de6e05042..0000000000
--- a/packages/linux/linux-omap2-git/beagleboard/03-gptimer_match_plus_ovf
+++ /dev/null
@@ -1,94 +0,0 @@
-OMAP2/3 system tick GPTIMER: use overflow interrupts to detect missing match interrupts
-
-From: Paul Walmsley <paul@pwsan.com>
-
-GPTIMER1 on some OMAP3 chips occasionally misses match conditions
-between the timer counter and the target register value, and does not
-interrupt to the MPU.  This patch adds another line of defense by
-setting the timer to generate an overflow interrupt 0.5 seconds after the
-timer passes the original comparison value.
-
-If interrupts are masked for a long period of time, one would expect
-both a match and an overflow interrupt to be logged.  This is considered
-a normal condition.  However, if only an overflow interrupt is logged,
-this is considered evidence of a hardware bug and the kernel will issue
-a warning.
-
-This workaround is unlikely to be 100% effective, since GPTIMER1 has
-also been observed to lose overflow interrupts occasionally.  It is
-hoped that the probability of losing both will be significantly lower
-than the probability of losing either one.
----
-
- arch/arm/mach-omap2/timer-gp.c |   36 ++++++++++++++++++++++++++++++++----
- 1 files changed, 32 insertions(+), 4 deletions(-)
-
-diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
-index 51996ba..ce5c2b4 100644
---- a/arch/arm/mach-omap2/timer-gp.c
-+++ b/arch/arm/mach-omap2/timer-gp.c
-@@ -36,17 +36,43 @@
- #include <asm/mach/time.h>
- #include <asm/arch/dmtimer.h>
- 
--#define GPTIMER_MATCH_VAL      0xffff0000
-+/* 
-+ * The number of timer ticks to delay will be subtracted from
-+ * GPTIMER_MATCH_VAL before loading into the timer.  So GPTIMER_MATCH_VAL
-+ * constrains the longest delay that can be generated with the timer.
-+ * Since the current code uses overflow interrupts as protection against
-+ * missed comparison interrupts, this value should also be sufficiently
-+ * large such that there is not an excessively long delay between ticks
-+ * if the comparison interrupt fails to arrive.  The 0xfffff800 value 
-+ * below results in a half-second delay in such a case when using
-+ * the 32kHz timer as source.
-+ */
-+#define GPTIMER_MATCH_VAL	(0xffffffff - (32768/2))
- 
- static struct omap_dm_timer *gptimer;
- static struct clock_event_device clockevent_gpt;
- 
-+static u32 last_load;
-+
- static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
- {
- 	struct omap_dm_timer *gpt = (struct omap_dm_timer *)dev_id;
- 	struct clock_event_device *evt = &clockevent_gpt;
--
--	omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_MATCH);
-+	u32 v;
-+
-+	v = omap_dm_timer_read_status(gpt);
-+	if ((v & OMAP_TIMER_INT_OVERFLOW) && !(v & OMAP_TIMER_INT_MATCH)) {
-+		/*
-+		 * Should never happen.  Current belief is that this is
-+		 * due to a hardware bug in the GPTIMER block on some 
-+		 * OMAP3 revisions.
-+		 */
-+		pr_err("*** GPTIMER missed match interrupt! last load: %08x\n",
-+			last_load);
-+		WARN_ON(1);
-+	}
-+
-+	omap_dm_timer_write_status(gpt, v);
- 
- 	evt->event_handler(evt);
- 	return IRQ_HANDLED;
-@@ -61,6 +87,7 @@ static struct irqaction omap2_gp_timer_irq = {
- static int omap2_gp_timer_set_next_event(unsigned long cycles,
- 					 struct clock_event_device *evt)
- {
-+	last_load = GPTIMER_MATCH_VAL - cycles;
- 	omap_dm_timer_set_load_start(gptimer, 0, GPTIMER_MATCH_VAL - cycles);
- 
- 	return 0;
-@@ -99,7 +126,8 @@ static void __init omap2_gp_clockevent_init(void)
- 	omap_dm_timer_stop(gptimer);
- 	/*	omap_dm_timer_set_load(gptimer, 0, 0);*/
- 	omap_dm_timer_set_match(gptimer, 1, GPTIMER_MATCH_VAL);
--	omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_MATCH);
-+	omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_MATCH | 
-+				     OMAP_TIMER_INT_OVERFLOW);
- 
- 	clockevent_gpt.mult = div_sc(tick_rate, NSEC_PER_SEC,
- 				     clockevent_gpt.shift);
diff --git a/packages/linux/linux-omap2-git/beagleboard/04-gptimer_add_debug_to_sysrq_q b/packages/linux/linux-omap2-git/beagleboard/04-gptimer_add_debug_to_sysrq_q
deleted file mode 100644
index aa9f09811a..0000000000
--- a/packages/linux/linux-omap2-git/beagleboard/04-gptimer_add_debug_to_sysrq_q
+++ /dev/null
@@ -1,110 +0,0 @@
-Add extra debug for the q_d_w_o() when work fn is already active.
-
-From: Paul Walmsley <paul@pwsan.com>
-
-
----
-
- arch/arm/mach-omap2/timer-gp.c      |    3 ++-
- arch/arm/plat-omap/dmtimer.c        |   20 ++++++++++++++++++++
- include/asm-arm/arch-omap/dmtimer.h |    1 +
- kernel/time/timer_list.c            |    8 ++++++++
- 4 files changed, 31 insertions(+), 1 deletions(-)
-
-diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c
-index ce5c2b4..e3ed368 100644
---- a/arch/arm/mach-omap2/timer-gp.c
-+++ b/arch/arm/mach-omap2/timer-gp.c
-@@ -50,6 +50,7 @@
- #define GPTIMER_MATCH_VAL	(0xffffffff - (32768/2))
- 
- static struct omap_dm_timer *gptimer;
-+struct omap_dm_timer *gptimer_pub;
- static struct clock_event_device clockevent_gpt;
- 
- static u32 last_load;
-@@ -111,7 +112,7 @@ static void __init omap2_gp_clockevent_init(void)
- {
- 	u32 tick_rate;
- 
--	gptimer = omap_dm_timer_request_specific(1);
-+	gptimer = gptimer_pub = omap_dm_timer_request_specific(1);
- 	BUG_ON(gptimer == NULL);
- 
- #if defined(CONFIG_OMAP_32K_TIMER)
-diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
-index e38a11e..b10f8ac 100644
---- a/arch/arm/plat-omap/dmtimer.c
-+++ b/arch/arm/plat-omap/dmtimer.c
-@@ -614,6 +614,26 @@ void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
- 	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, value);
- }
- 
-+void omap_dm_timer_dump_int_enable(struct omap_dm_timer *timer)
-+{
-+	u32 l;
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
-+	pr_err("GPT TCRR: %08x\n", l);
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_MATCH_REG);
-+	pr_err("GPT TMAT: %08x\n", l);
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
-+	pr_err("GPT TISR: %08x\n", l);
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_INT_EN_REG);
-+	pr_err("GPT TIER: %08x\n", l);
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-+	pr_err("GPT TCLR: %08x\n", l);
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_TICK_INT_MASK_SET_REG);
-+	pr_err("GPT TOCR: %08x\n", l);
-+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_TICK_INT_MASK_COUNT_REG);
-+	pr_err("GPT TOWR: %08x\n", l);
-+}
-+
-+
- unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
- {
- 	unsigned int l;
-diff --git a/include/asm-arm/arch-omap/dmtimer.h b/include/asm-arm/arch-omap/dmtimer.h
-index 02b29e8..a8123e9 100644
---- a/include/asm-arm/arch-omap/dmtimer.h
-+++ b/include/asm-arm/arch-omap/dmtimer.h
-@@ -73,6 +73,7 @@ void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);
- 
- void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);
- 
-+void omap_dm_timer_dump_int_enable(struct omap_dm_timer *timer);
- unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
- void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
- unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
-diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
-index a40e20f..452eab7 100644
---- a/kernel/time/timer_list.c
-+++ b/kernel/time/timer_list.c
-@@ -18,6 +18,8 @@
- #include <linux/kallsyms.h>
- #include <linux/tick.h>
- 
-+#include <asm/arch/dmtimer.h>
-+
- #include <asm/uaccess.h>
- 
- typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
-@@ -239,6 +241,8 @@ static void timer_list_show_tickdevices(struct seq_file *m)
- static void timer_list_show_tickdevices(struct seq_file *m) { }
- #endif
- 
-+extern struct omap_dm_timer *gptimer_pub;
-+
- static int timer_list_show(struct seq_file *m, void *v)
- {
- 	u64 now = ktime_to_ns(ktime_get());
-@@ -254,6 +258,10 @@ static int timer_list_show(struct seq_file *m, void *v)
- 	SEQ_printf(m, "\n");
- 	timer_list_show_tickdevices(m);
- 
-+	SEQ_printf(m, "\n");
-+	
-+	omap_dm_timer_dump_int_enable(gptimer_pub);
-+
- 	return 0;
- }
- 
diff --git a/packages/linux/linux-omap2-git/beagleboard/defconfig b/packages/linux/linux-omap2-git/beagleboard/defconfig
index d01d473ed5..c07d0ab5e2 100644
--- a/packages/linux/linux-omap2-git/beagleboard/defconfig
+++ b/packages/linux/linux-omap2-git/beagleboard/defconfig
@@ -187,8 +187,8 @@ CONFIG_OMAP_BOOT_REASON=y
 CONFIG_OMAP_MCBSP=y
 # CONFIG_OMAP_MMU_FWK is not set
 # CONFIG_OMAP_MBOX_FWK is not set
-CONFIG_OMAP_MPU_TIMER=y
-# CONFIG_OMAP_32K_TIMER is not set
+# CONFIG_OMAP_MPU_TIMER is not set
+CONFIG_OMAP_32K_TIMER=y
 CONFIG_OMAP_DM_TIMER=y
 # CONFIG_OMAP_LL_DEBUG_UART1 is not set
 # CONFIG_OMAP_LL_DEBUG_UART2 is not set
@@ -203,6 +203,7 @@ CONFIG_ARCH_OMAP3430=y
 # CONFIG_MACH_OMAP_3430SDP is not set
 # CONFIG_MACH_OMAP3EVM is not set
 CONFIG_MACH_OMAP3_BEAGLE=y
+CONFIG_OMAP_TICK_GPTIMER=12
 
 #
 # Boot options