aboutsummaryrefslogtreecommitdiff
path: root/drivers/char
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/hpet.c159
1 files changed, 89 insertions, 70 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index b3f5dbc6d88..f3cfb4c7612 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -53,6 +53,11 @@
#define HPET_RANGE_SIZE 1024 /* from HPET spec */
+
+/* WARNING -- don't get confused. These macros are never used
+ * to write the (single) counter, and rarely to read it.
+ * They're badly named; to fix, someday.
+ */
#if BITS_PER_LONG == 64
#define write_counter(V, MC) writeq(V, MC)
#define read_counter(MC) readq(MC)
@@ -77,7 +82,7 @@ static struct clocksource clocksource_hpet = {
.rating = 250,
.read = read_hpet,
.mask = CLOCKSOURCE_MASK(64),
- .mult = 0, /*to be caluclated*/
+ .mult = 0, /* to be calculated */
.shift = 10,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -86,8 +91,6 @@ static struct clocksource *hpet_clocksource;
/* A lock for concurrent access by app and isr hpet activity. */
static DEFINE_SPINLOCK(hpet_lock);
-/* A lock for concurrent intermodule access to hpet and isr hpet activity. */
-static DEFINE_SPINLOCK(hpet_task_lock);
#define HPET_DEV_NAME (7)
@@ -99,7 +102,6 @@ struct hpet_dev {
unsigned long hd_irqdata;
wait_queue_head_t hd_waitqueue;
struct fasync_struct *hd_async_queue;
- struct hpet_task *hd_task;
unsigned int hd_flags;
unsigned int hd_irq;
unsigned int hd_hdwirq;
@@ -173,11 +175,6 @@ static irqreturn_t hpet_interrupt(int irq, void *data)
writel(isr, &devp->hd_hpet->hpet_isr);
spin_unlock(&hpet_lock);
- spin_lock(&hpet_task_lock);
- if (devp->hd_task)
- devp->hd_task->ht_func(devp->hd_task->ht_data);
- spin_unlock(&hpet_task_lock);
-
wake_up_interruptible(&devp->hd_waitqueue);
kill_fasync(&devp->hd_async_queue, SIGIO, POLL_IN);
@@ -185,6 +182,67 @@ static irqreturn_t hpet_interrupt(int irq, void *data)
return IRQ_HANDLED;
}
+static void hpet_timer_set_irq(struct hpet_dev *devp)
+{
+ unsigned long v;
+ int irq, gsi;
+ struct hpet_timer __iomem *timer;
+
+ spin_lock_irq(&hpet_lock);
+ if (devp->hd_hdwirq) {
+ spin_unlock_irq(&hpet_lock);
+ return;
+ }
+
+ timer = devp->hd_timer;
+
+ /* we prefer level triggered mode */
+ v = readl(&timer->hpet_config);
+ if (!(v & Tn_INT_TYPE_CNF_MASK)) {
+ v |= Tn_INT_TYPE_CNF_MASK;
+ writel(v, &timer->hpet_config);
+ }
+ spin_unlock_irq(&hpet_lock);
+
+ v = (readq(&timer->hpet_config) & Tn_INT_ROUTE_CAP_MASK) >>
+ Tn_INT_ROUTE_CAP_SHIFT;
+
+ /*
+ * In PIC mode, skip IRQ0-4, IRQ6-9, IRQ12-15 which is always used by
+ * legacy device. In IO APIC mode, we skip all the legacy IRQS.
+ */
+ if (acpi_irq_model == ACPI_IRQ_MODEL_PIC)
+ v &= ~0xf3df;
+ else
+ v &= ~0xffff;
+
+ for (irq = find_first_bit(&v, HPET_MAX_IRQ); irq < HPET_MAX_IRQ;
+ irq = find_next_bit(&v, HPET_MAX_IRQ, 1 + irq)) {
+
+ if (irq >= NR_IRQS) {
+ irq = HPET_MAX_IRQ;
+ break;
+ }
+
+ gsi = acpi_register_gsi(irq, ACPI_LEVEL_SENSITIVE,
+ ACPI_ACTIVE_LOW);
+ if (gsi > 0)
+ break;
+
+ /* FIXME: Setup interrupt source table */
+ }
+
+ if (irq < HPET_MAX_IRQ) {
+ spin_lock_irq(&hpet_lock);
+ v = readl(&timer->hpet_config);
+ v |= irq << Tn_INT_ROUTE_CNF_SHIFT;
+ writel(v, &timer->hpet_config);
+ devp->hd_hdwirq = gsi;
+ spin_unlock_irq(&hpet_lock);
+ }
+ return;
+}
+
static int hpet_open(struct inode *inode, struct file *file)
{
struct hpet_dev *devp;
@@ -199,8 +257,7 @@ static int hpet_open(struct inode *inode, struct file *file)
for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
for (i = 0; i < hpetp->hp_ntimer; i++)
- if (hpetp->hp_dev[i].hd_flags & HPET_OPEN
- || hpetp->hp_dev[i].hd_task)
+ if (hpetp->hp_dev[i].hd_flags & HPET_OPEN)
continue;
else {
devp = &hpetp->hp_dev[i];
@@ -219,6 +276,8 @@ static int hpet_open(struct inode *inode, struct file *file)
spin_unlock_irq(&hpet_lock);
unlock_kernel();
+ hpet_timer_set_irq(devp);
+
return 0;
}
@@ -441,7 +500,11 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
devp->hd_irq = irq;
t = devp->hd_ireqfreq;
v = readq(&timer->hpet_config);
- g = v | Tn_INT_ENB_CNF_MASK;
+
+ /* 64-bit comparators are not yet supported through the ioctls,
+ * so force this into 32-bit mode if it supports both modes
+ */
+ g = v | Tn_32MODE_CNF_MASK | Tn_INT_ENB_CNF_MASK;
if (devp->hd_flags & HPET_PERIODIC) {
write_counter(t, &timer->hpet_compare);
@@ -451,6 +514,12 @@ static int hpet_ioctl_ieon(struct hpet_dev *devp)
v |= Tn_VAL_SET_CNF_MASK;
writeq(v, &timer->hpet_config);
local_irq_save(flags);
+
+ /* NOTE: what we modify here is a hidden accumulator
+ * register supported by periodic-capable comparators.
+ * We never want to modify the (single) counter; that
+ * would affect all the comparators.
+ */
m = read_counter(&hpet->hpet_mc);
write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
} else {
@@ -604,57 +673,6 @@ static int hpet_is_known(struct hpet_data *hdp)
return 0;
}
-static inline int hpet_tpcheck(struct hpet_task *tp)
-{
- struct hpet_dev *devp;
- struct hpets *hpetp;
-
- devp = tp->ht_opaque;
-
- if (!devp)
- return -ENXIO;
-
- for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
- if (devp >= hpetp->hp_dev
- && devp < (hpetp->hp_dev + hpetp->hp_ntimer)
- && devp->hd_hpet == hpetp->hp_hpet)
- return 0;
-
- return -ENXIO;
-}
-
-#if 0
-int hpet_unregister(struct hpet_task *tp)
-{
- struct hpet_dev *devp;
- struct hpet_timer __iomem *timer;
- int err;
-
- if ((err = hpet_tpcheck(tp)))
- return err;
-
- spin_lock_irq(&hpet_task_lock);
- spin_lock(&hpet_lock);
-
- devp = tp->ht_opaque;
- if (devp->hd_task != tp) {
- spin_unlock(&hpet_lock);
- spin_unlock_irq(&hpet_task_lock);
- return -ENXIO;
- }
-
- timer = devp->hd_timer;
- writeq((readq(&timer->hpet_config) & ~Tn_INT_ENB_CNF_MASK),
- &timer->hpet_config);
- devp->hd_flags &= ~(HPET_IE | HPET_PERIODIC);
- devp->hd_task = NULL;
- spin_unlock(&hpet_lock);
- spin_unlock_irq(&hpet_task_lock);
-
- return 0;
-}
-#endif /* 0 */
-
static ctl_table hpet_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
@@ -746,6 +764,7 @@ int hpet_alloc(struct hpet_data *hdp)
static struct hpets *last = NULL;
unsigned long period;
unsigned long long temp;
+ u32 remainder;
/*
* hpet_alloc can be called by platform dependent code.
@@ -809,9 +828,13 @@ int hpet_alloc(struct hpet_data *hdp)
printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
printk("\n");
- printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n",
- hpetp->hp_which, hpetp->hp_ntimer,
- cap & HPET_COUNTER_SIZE_MASK ? 64 : 32, hpetp->hp_tick_freq);
+ temp = hpetp->hp_tick_freq;
+ remainder = do_div(temp, 1000000);
+ printk(KERN_INFO
+ "hpet%u: %u comparators, %d-bit %u.%06u MHz counter\n",
+ hpetp->hp_which, hpetp->hp_ntimer,
+ cap & HPET_COUNTER_SIZE_MASK ? 64 : 32,
+ (unsigned) temp, remainder);
mcfg = readq(&hpet->hpet_config);
if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {
@@ -874,8 +897,6 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data)
hdp->hd_address = ioremap(addr.minimum, addr.address_length);
if (hpet_is_known(hdp)) {
- printk(KERN_DEBUG "%s: 0x%lx is busy\n",
- __func__, hdp->hd_phys_address);
iounmap(hdp->hd_address);
return AE_ALREADY_EXISTS;
}
@@ -891,8 +912,6 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data)
HPET_RANGE_SIZE);
if (hpet_is_known(hdp)) {
- printk(KERN_DEBUG "%s: 0x%lx is busy\n",
- __func__, hdp->hd_phys_address);
iounmap(hdp->hd_address);
return AE_ALREADY_EXISTS;
}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-17 15:52:16 +0000