#include <linux/bcd.h>
#include <linux/seq_file.h>
#include <linux/bitops.h>
+#include <linux/clocksource.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#define HPET_RANGE_SIZE 1024 /* from HPET spec */
+#if BITS_PER_LONG == 64
+#define write_counter(V, MC) writeq(V, MC)
+#define read_counter(MC) readq(MC)
+#else
+#define write_counter(V, MC) writel(V, MC)
+#define read_counter(MC) readl(MC)
+#endif
+
static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
+/* This clocksource driver currently only works on ia64 */
+#ifdef CONFIG_IA64
+static void __iomem *hpet_mctr;
+
+static cycle_t read_hpet(void)
+{
+ return (cycle_t)read_counter((void __iomem *)hpet_mctr);
+}
+
+static struct clocksource clocksource_hpet = {
+ .name = "hpet",
+ .rating = 250,
+ .read = read_hpet,
+ .mask = CLOCKSOURCE_MASK(64),
+ .mult = 0, /*to be caluclated*/
+ .shift = 10,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+static struct clocksource *hpet_clocksource;
+#endif
+
/* 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. */
struct hpets *hp_next;
struct hpet __iomem *hp_hpet;
unsigned long hp_hpet_phys;
- struct time_interpolator *hp_interpolator;
+ struct clocksource *hp_clocksource;
unsigned long long hp_tick_freq;
unsigned long hp_delta;
unsigned int hp_ntimer;
#define HPET_PERIODIC 0x0004
#define HPET_SHARED_IRQ 0x0008
-#if BITS_PER_LONG == 64
-#define write_counter(V, MC) writeq(V, MC)
-#define read_counter(MC) readq(MC)
-#else
-#define write_counter(V, MC) writel(V, MC)
-#define read_counter(MC) readl(MC)
-#endif
#ifndef readq
static inline unsigned long long readq(void __iomem *addr)
if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT,
PAGE_SIZE, vma->vm_page_prot)) {
printk(KERN_ERR "%s: io_remap_pfn_range failed\n",
- __FUNCTION__);
+ __func__);
return -EAGAIN;
}
return 0;
}
-EXPORT_SYMBOL(hpet_alloc);
-EXPORT_SYMBOL(hpet_register);
-EXPORT_SYMBOL(hpet_unregister);
-EXPORT_SYMBOL(hpet_control);
-
-int hpet_register(struct hpet_task *tp, int periodic)
-{
- unsigned int i;
- u64 mask;
- struct hpet_timer __iomem *timer;
- struct hpet_dev *devp;
- struct hpets *hpetp;
-
- switch (periodic) {
- case 1:
- mask = Tn_PER_INT_CAP_MASK;
- break;
- case 0:
- mask = 0;
- break;
- default:
- return -EINVAL;
- }
-
- tp->ht_opaque = NULL;
-
- spin_lock_irq(&hpet_task_lock);
- spin_lock(&hpet_lock);
-
- for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
- for (timer = hpetp->hp_hpet->hpet_timers, i = 0;
- i < hpetp->hp_ntimer; i++, timer++) {
- if ((readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK)
- != mask)
- continue;
-
- devp = &hpetp->hp_dev[i];
-
- if (devp->hd_flags & HPET_OPEN || devp->hd_task) {
- devp = NULL;
- continue;
- }
-
- tp->ht_opaque = devp;
- devp->hd_task = tp;
- break;
- }
-
- spin_unlock(&hpet_lock);
- spin_unlock_irq(&hpet_task_lock);
-
- if (tp->ht_opaque)
- return 0;
- else
- return -EBUSY;
-}
-
static inline int hpet_tpcheck(struct hpet_task *tp)
{
struct hpet_dev *devp;
return 0;
}
-int hpet_control(struct hpet_task *tp, unsigned int cmd, unsigned long arg)
-{
- struct hpet_dev *devp;
- int err;
-
- if ((err = hpet_tpcheck(tp)))
- return err;
-
- spin_lock_irq(&hpet_lock);
- devp = tp->ht_opaque;
- if (devp->hd_task != tp) {
- spin_unlock_irq(&hpet_lock);
- return -ENXIO;
- }
- spin_unlock_irq(&hpet_lock);
- return hpet_ioctl_common(devp, cmd, arg, 1);
-}
-
static ctl_table hpet_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
static struct ctl_table_header *sysctl_header;
-static void hpet_register_interpolator(struct hpets *hpetp)
-{
-#ifdef CONFIG_TIME_INTERPOLATION
- struct time_interpolator *ti;
-
- ti = kzalloc(sizeof(*ti), GFP_KERNEL);
- if (!ti)
- return;
-
- ti->source = TIME_SOURCE_MMIO64;
- ti->shift = 10;
- ti->addr = &hpetp->hp_hpet->hpet_mc;
- ti->frequency = hpetp->hp_tick_freq;
- ti->drift = HPET_DRIFT;
- ti->mask = -1;
-
- hpetp->hp_interpolator = ti;
- register_time_interpolator(ti);
-#endif
-}
-
/*
* Adjustment for when arming the timer with
* initial conditions. That is, main counter
*/
if (hpet_is_known(hdp)) {
printk(KERN_DEBUG "%s: duplicate HPET ignored\n",
- __FUNCTION__);
+ __func__);
return 0;
}
}
hpetp->hp_delta = hpet_calibrate(hpetp);
- hpet_register_interpolator(hpetp);
+
+/* This clocksource driver currently only works on ia64 */
+#ifdef CONFIG_IA64
+ if (!hpet_clocksource) {
+ hpet_mctr = (void __iomem *)&hpetp->hp_hpet->hpet_mc;
+ CLKSRC_FSYS_MMIO_SET(clocksource_hpet.fsys_mmio, hpet_mctr);
+ clocksource_hpet.mult = clocksource_hz2mult(hpetp->hp_tick_freq,
+ clocksource_hpet.shift);
+ clocksource_register(&clocksource_hpet);
+ hpetp->hp_clocksource = &clocksource_hpet;
+ hpet_clocksource = &clocksource_hpet;
+ }
+#endif
return 0;
}
if (hpet_is_known(hdp)) {
printk(KERN_DEBUG "%s: 0x%lx is busy\n",
- __FUNCTION__, hdp->hd_phys_address);
+ __func__, hdp->hd_phys_address);
iounmap(hdp->hd_address);
- return -EBUSY;
+ return AE_ALREADY_EXISTS;
}
} else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
struct acpi_resource_fixed_memory32 *fixmem32;
fixmem32 = &res->data.fixed_memory32;
if (!fixmem32)
- return -EINVAL;
+ return AE_NO_MEMORY;
hdp->hd_phys_address = fixmem32->address;
hdp->hd_address = ioremap(fixmem32->address,
if (hpet_is_known(hdp)) {
printk(KERN_DEBUG "%s: 0x%lx is busy\n",
- __FUNCTION__, hdp->hd_phys_address);
+ __func__, hdp->hd_phys_address);
iounmap(hdp->hd_address);
- return -EBUSY;
+ return AE_ALREADY_EXISTS;
}
} else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
struct acpi_resource_extended_irq *irqp;
return -ENODEV;
if (!data.hd_address || !data.hd_nirqs) {
- printk("%s: no address or irqs in _CRS\n", __FUNCTION__);
+ printk("%s: no address or irqs in _CRS\n", __func__);
return -ENODEV;
}
static int hpet_acpi_remove(struct acpi_device *device, int type)
{
- /* XXX need to unregister interpolator, dealloc mem, etc */
+ /* XXX need to unregister clocksource, dealloc mem, etc */
return -EINVAL;
}
+static const struct acpi_device_id hpet_device_ids[] = {
+ {"PNP0103", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, hpet_device_ids);
+
static struct acpi_driver hpet_acpi_driver = {
.name = "hpet",
- .ids = "PNP0103",
+ .ids = hpet_device_ids,
.ops = {
.add = hpet_acpi_add,
.remove = hpet_acpi_remove,
if (result < 0)
return -ENODEV;
- sysctl_header = register_sysctl_table(dev_root, 0);
+ sysctl_header = register_sysctl_table(dev_root);
result = acpi_bus_register_driver(&hpet_acpi_driver);
if (result < 0) {
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