* published by the Free Software Foundation.
*/
-#include <linux/config.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/poll.h>
+#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/sysctl.h>
#include <linux/wait.h>
#include <linux/bcd.h>
#include <linux/seq_file.h>
+#include <linux/bitops.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
-#include <asm/bitops.h>
#include <asm/div64.h>
#include <linux/acpi.h>
/*
* The High Precision Event Timer driver.
* This driver is closely modelled after the rtc.c driver.
- * http://www.intel.com/labs/platcomp/hpet/hpetspec.htm
+ * http://www.intel.com/hardwaredesign/hpetspec.htm
*/
#define HPET_USER_FREQ (64)
#define HPET_DRIFT (500)
-static u32 hpet_ntimer, hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
+#define HPET_RANGE_SIZE 1024 /* from HPET spec */
+
+static u32 hpet_nhpet, hpet_max_freq = HPET_USER_FREQ;
/* A lock for concurrent access by app and isr hpet activity. */
-static spinlock_t hpet_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(hpet_lock);
/* A lock for concurrent intermodule access to hpet and isr hpet activity. */
-static spinlock_t hpet_task_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(hpet_task_lock);
#define HPET_DEV_NAME (7)
struct hpet_dev {
struct hpets *hd_hpets;
- struct hpet *hd_hpet;
- struct hpet_timer *hd_timer;
+ struct hpet __iomem *hd_hpet;
+ struct hpet_timer __iomem *hd_timer;
unsigned long hd_ireqfreq;
unsigned long hd_irqdata;
wait_queue_head_t hd_waitqueue;
struct hpets {
struct hpets *hp_next;
- struct hpet *hp_hpet;
- unsigned long hp_period;
+ struct hpet __iomem *hp_hpet;
+ unsigned long hp_hpet_phys;
+ struct time_interpolator *hp_interpolator;
+ unsigned long long hp_tick_freq;
unsigned long hp_delta;
unsigned int hp_ntimer;
unsigned int hp_which;
#define HPET_OPEN 0x0001
#define HPET_IE 0x0002 /* interrupt enabled */
#define HPET_PERIODIC 0x0004
+#define HPET_SHARED_IRQ 0x0008
#if BITS_PER_LONG == 64
#define write_counter(V, MC) writeq(V, MC)
#endif
#ifndef readq
-static unsigned long long __inline readq(void *addr)
+static inline unsigned long long readq(void __iomem *addr)
{
return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL);
}
#endif
#ifndef writeq
-static void __inline writeq(unsigned long long v, void *addr)
+static inline void writeq(unsigned long long v, void __iomem *addr)
{
writel(v & 0xffffffff, addr);
writel(v >> 32, addr + 4);
}
#endif
-static irqreturn_t hpet_interrupt(int irq, void *data, struct pt_regs *regs)
+static irqreturn_t hpet_interrupt(int irq, void *data)
{
struct hpet_dev *devp;
unsigned long isr;
devp = data;
+ isr = 1 << (devp - devp->hd_hpets->hp_dev);
+
+ if ((devp->hd_flags & HPET_SHARED_IRQ) &&
+ !(isr & readl(&devp->hd_hpet->hpet_isr)))
+ return IRQ_NONE;
spin_lock(&hpet_lock);
devp->hd_irqdata++;
&devp->hd_timer->hpet_compare);
}
- isr = (1 << (devp - devp->hd_hpets->hp_dev));
- writeq(isr, &devp->hd_hpet->hpet_isr);
+ if (devp->hd_flags & HPET_SHARED_IRQ)
+ writel(isr, &devp->hd_hpet->hpet_isr);
spin_unlock(&hpet_lock);
spin_lock(&hpet_task_lock);
return -EINVAL;
devp = file->private_data;
- addr = (unsigned long)devp->hd_hpet;
+ addr = devp->hd_hpets->hp_hpet_phys;
if (addr & (PAGE_SIZE - 1))
return -ENOSYS;
vma->vm_flags |= VM_IO;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
- addr = __pa(addr);
- if (remap_page_range
- (vma, vma->vm_start, addr, PAGE_SIZE, vma->vm_page_prot)) {
- printk(KERN_ERR "remap_page_range failed in hpet.c\n");
+ 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__);
return -EAGAIN;
}
static int hpet_release(struct inode *inode, struct file *file)
{
struct hpet_dev *devp;
- struct hpet_timer *timer;
+ struct hpet_timer __iomem *timer;
int irq = 0;
devp = file->private_data;
static int hpet_ioctl_ieon(struct hpet_dev *devp)
{
- struct hpet_timer *timer;
- struct hpet *hpet;
+ struct hpet_timer __iomem *timer;
+ struct hpet __iomem *hpet;
struct hpets *hpetp;
int irq;
unsigned long g, v, t, m;
hpet = devp->hd_hpet;
hpetp = devp->hd_hpets;
- v = readq(&timer->hpet_config);
+ if (!devp->hd_ireqfreq)
+ return -EIO;
+
spin_lock_irq(&hpet_lock);
if (devp->hd_flags & HPET_IE) {
}
devp->hd_flags |= HPET_IE;
+
+ if (readl(&timer->hpet_config) & Tn_INT_TYPE_CNF_MASK)
+ devp->hd_flags |= HPET_SHARED_IRQ;
spin_unlock_irq(&hpet_lock);
- t = readq(&timer->hpet_config);
irq = devp->hd_hdwirq;
if (irq) {
- sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
+ unsigned long irq_flags;
- if (request_irq
- (irq, hpet_interrupt, SA_INTERRUPT, devp->hd_name, (void *)devp)) {
+ sprintf(devp->hd_name, "hpet%d", (int)(devp - hpetp->hp_dev));
+ irq_flags = devp->hd_flags & HPET_SHARED_IRQ
+ ? IRQF_SHARED : IRQF_DISABLED;
+ if (request_irq(irq, hpet_interrupt, irq_flags,
+ devp->hd_name, (void *)devp)) {
printk(KERN_ERR "hpet: IRQ %d is not free\n", irq);
irq = 0;
}
write_counter(t + m + hpetp->hp_delta, &timer->hpet_compare);
}
- isr = (1 << (devp - hpets->hp_dev));
- writeq(isr, &hpet->hpet_isr);
+ if (devp->hd_flags & HPET_SHARED_IRQ) {
+ isr = 1 << (devp - devp->hd_hpets->hp_dev);
+ writel(isr, &hpet->hpet_isr);
+ }
writeq(g, &timer->hpet_config);
local_irq_restore(flags);
return 0;
}
-static inline unsigned long hpet_time_div(unsigned long dis)
+/* converts Hz to number of timer ticks */
+static inline unsigned long hpet_time_div(struct hpets *hpets,
+ unsigned long dis)
{
- unsigned long long m = 1000000000000000ULL;
+ unsigned long long m;
+ m = hpets->hp_tick_freq + (dis >> 1);
do_div(m, dis);
-
return (unsigned long)m;
}
static int
hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel)
{
- struct hpet_timer *timer;
- struct hpet *hpet;
+ struct hpet_timer __iomem *timer;
+ struct hpet __iomem *hpet;
struct hpets *hpetp;
int err;
unsigned long v;
{
struct hpet_info info;
- info.hi_ireqfreq = hpet_time_div(hpetp->hp_period *
- devp->hd_ireqfreq);
+ if (devp->hd_ireqfreq)
+ info.hi_ireqfreq =
+ hpet_time_div(hpetp, devp->hd_ireqfreq);
+ else
+ info.hi_ireqfreq = 0;
info.hi_flags =
readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
- info.hi_hpet = devp->hd_hpets->hp_which;
- info.hi_timer = devp - devp->hd_hpets->hp_dev;
- if (copy_to_user((void __user *)arg, &info, sizeof(info)))
- err = -EFAULT;
+ info.hi_hpet = hpetp->hp_which;
+ info.hi_timer = devp - hpetp->hp_dev;
+ if (kernel)
+ memcpy((void *)arg, &info, sizeof(info));
+ else
+ if (copy_to_user((void __user *)arg, &info,
+ sizeof(info)))
+ err = -EFAULT;
break;
}
case HPET_EPI:
break;
}
- if (arg & (arg - 1)) {
+ if (!arg) {
err = -EINVAL;
break;
}
- devp->hd_ireqfreq = hpet_time_div(hpetp->hp_period * arg);
+ devp->hd_ireqfreq = hpet_time_div(hpetp, arg);
}
return err;
}
-static struct file_operations hpet_fops = {
+static const struct file_operations hpet_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = hpet_read,
.mmap = hpet_mmap,
};
+static int hpet_is_known(struct hpet_data *hdp)
+{
+ struct hpets *hpetp;
+
+ for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
+ if (hpetp->hp_hpet_phys == hdp->hd_phys_address)
+ return 1;
+
+ return 0;
+}
+
EXPORT_SYMBOL(hpet_alloc);
EXPORT_SYMBOL(hpet_register);
EXPORT_SYMBOL(hpet_unregister);
{
unsigned int i;
u64 mask;
- struct hpet_timer *timer;
+ struct hpet_timer __iomem *timer;
struct hpet_dev *devp;
struct hpets *hpetp;
return -EINVAL;
}
+ tp->ht_opaque = NULL;
+
spin_lock_irq(&hpet_task_lock);
spin_lock(&hpet_lock);
int hpet_unregister(struct hpet_task *tp)
{
struct hpet_dev *devp;
- struct hpet_timer *timer;
+ struct hpet_timer __iomem *timer;
int err;
if ((err = hpet_tpcheck(tp)))
return hpet_ioctl_common(devp, cmd, arg, 1);
}
-#ifdef CONFIG_TIME_INTERPOLATION
-
-static unsigned long hpet_offset, last_wall_hpet;
-static long hpet_nsecs_per_cycle, hpet_cycles_per_sec;
-
-static unsigned long hpet_getoffset(void)
-{
- return hpet_offset + (read_counter(&hpets->hp_hpet->hpet_mc) -
- last_wall_hpet) * hpet_nsecs_per_cycle;
-}
-
-static void hpet_update(long delta)
-{
- unsigned long mc;
- unsigned long offset;
-
- mc = read_counter(&hpets->hp_hpet->hpet_mc);
- offset = hpet_offset + (mc - last_wall_hpet) * hpet_nsecs_per_cycle;
-
- if (delta < 0 || (unsigned long)delta < offset)
- hpet_offset = offset - delta;
- else
- hpet_offset = 0;
- last_wall_hpet = mc;
-}
-
-static void hpet_reset(void)
-{
- hpet_offset = 0;
- last_wall_hpet = read_counter(&hpets->hp_hpet->hpet_mc);
-}
-
-static struct time_interpolator hpet_interpolator = {
- .get_offset = hpet_getoffset,
- .update = hpet_update,
- .reset = hpet_reset
-};
-
-#endif
-
static ctl_table hpet_table[] = {
{
.ctl_name = 1,
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
*/
#define TICK_CALIBRATE (1000UL)
-static unsigned long __init hpet_calibrate(struct hpets *hpetp)
+static unsigned long hpet_calibrate(struct hpets *hpetp)
{
- struct hpet_timer *timer = NULL;
+ struct hpet_timer __iomem *timer = NULL;
unsigned long t, m, count, i, flags, start;
struct hpet_dev *devp;
int j;
- struct hpet *hpet;
+ struct hpet __iomem *hpet;
for (j = 0, devp = hpetp->hp_dev; j < hpetp->hp_ntimer; j++, devp++)
if ((devp->hd_flags & HPET_OPEN) == 0) {
if (!timer)
return 0;
- hpet = hpets->hp_hpet;
+ hpet = hpetp->hp_hpet;
t = read_counter(&timer->hpet_compare);
i = 0;
- count = hpet_time_div(hpetp->hp_period * TICK_CALIBRATE);
+ count = hpet_time_div(hpetp, TICK_CALIBRATE);
local_irq_save(flags);
return (m - start) / i;
}
-int __init hpet_alloc(struct hpet_data *hdp)
+int hpet_alloc(struct hpet_data *hdp)
{
u64 cap, mcfg;
struct hpet_dev *devp;
u32 i, ntimer;
struct hpets *hpetp;
size_t siz;
- struct hpet *hpet;
- static struct hpets *last __initdata = (struct hpets *)0;
+ struct hpet __iomem *hpet;
+ static struct hpets *last = NULL;
+ unsigned long period;
+ unsigned long long temp;
/*
* hpet_alloc can be called by platform dependent code.
- * if platform dependent code has allocated the hpet
- * ACPI also reports hpet, then we catch it here.
+ * If platform dependent code has allocated the hpet that
+ * ACPI has also reported, then we catch it here.
*/
- for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
- if (hpetp->hp_hpet == (struct hpet *)(hdp->hd_address))
- return 0;
+ if (hpet_is_known(hdp)) {
+ printk(KERN_DEBUG "%s: duplicate HPET ignored\n",
+ __FUNCTION__);
+ return 0;
+ }
siz = sizeof(struct hpets) + ((hdp->hd_nirqs - 1) *
sizeof(struct hpet_dev));
- hpetp = kmalloc(siz, GFP_KERNEL);
+ hpetp = kzalloc(siz, GFP_KERNEL);
if (!hpetp)
return -ENOMEM;
- memset(hpetp, 0, siz);
-
hpetp->hp_which = hpet_nhpet++;
- hpetp->hp_hpet = (struct hpet *)hdp->hd_address;
+ hpetp->hp_hpet = hdp->hd_address;
+ hpetp->hp_hpet_phys = hdp->hd_phys_address;
hpetp->hp_ntimer = hdp->hd_nirqs;
last = hpetp;
- hpetp->hp_period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >>
- HPET_COUNTER_CLK_PERIOD_SHIFT;
+ period = (cap & HPET_COUNTER_CLK_PERIOD_MASK) >>
+ HPET_COUNTER_CLK_PERIOD_SHIFT; /* fs, 10^-15 */
+ temp = 1000000000000000uLL; /* 10^15 femtoseconds per second */
+ temp += period >> 1; /* round */
+ do_div(temp, period);
+ hpetp->hp_tick_freq = temp; /* ticks per second */
+
+ printk(KERN_INFO "hpet%d: at MMIO 0x%lx, IRQ%s",
+ hpetp->hp_which, hdp->hd_phys_address,
+ hpetp->hp_ntimer > 1 ? "s" : "");
+ for (i = 0; i < hpetp->hp_ntimer; i++)
+ 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);
mcfg = readq(&hpet->hpet_config);
if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {
writeq(mcfg, &hpet->hpet_config);
}
- for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer;
- i++, hpet_ntimer++, devp++) {
- unsigned long v;
- struct hpet_timer *timer;
+ for (i = 0, devp = hpetp->hp_dev; i < hpetp->hp_ntimer; i++, devp++) {
+ struct hpet_timer __iomem *timer;
timer = &hpet->hpet_timers[devp - hpetp->hp_dev];
- v = readq(&timer->hpet_config);
devp->hd_hpets = hpetp;
devp->hd_hpet = hpet;
}
hpetp->hp_delta = hpet_calibrate(hpetp);
+ hpet_register_interpolator(hpetp);
return 0;
}
-static acpi_status __init hpet_resources(struct acpi_resource *res, void *data)
+static acpi_status hpet_resources(struct acpi_resource *res, void *data)
{
struct hpet_data *hdp;
acpi_status status;
struct acpi_resource_address64 addr;
- struct hpets *hpetp;
hdp = data;
status = acpi_resource_to_address64(res, &addr);
if (ACPI_SUCCESS(status)) {
- unsigned long size;
-
- size = addr.max_address_range - addr.min_address_range + 1;
- hdp->hd_address =
- (unsigned long)ioremap(addr.min_address_range, size);
-
- for (hpetp = hpets; hpetp; hpetp = hpetp->hp_next)
- if (hpetp->hp_hpet == (struct hpet *)(hdp->hd_address))
- return -EBUSY;
- } else if (res->id == ACPI_RSTYPE_EXT_IRQ) {
- struct acpi_resource_ext_irq *irqp;
- int i;
+ hdp->hd_phys_address = addr.minimum;
+ hdp->hd_address = ioremap(addr.minimum, addr.address_length);
+
+ if (hpet_is_known(hdp)) {
+ printk(KERN_DEBUG "%s: 0x%lx is busy\n",
+ __FUNCTION__, hdp->hd_phys_address);
+ iounmap(hdp->hd_address);
+ return -EBUSY;
+ }
+ } else if (res->type == ACPI_RESOURCE_TYPE_FIXED_MEMORY32) {
+ struct acpi_resource_fixed_memory32 *fixmem32;
+
+ fixmem32 = &res->data.fixed_memory32;
+ if (!fixmem32)
+ return -EINVAL;
+
+ hdp->hd_phys_address = fixmem32->address;
+ hdp->hd_address = ioremap(fixmem32->address,
+ HPET_RANGE_SIZE);
+
+ if (hpet_is_known(hdp)) {
+ printk(KERN_DEBUG "%s: 0x%lx is busy\n",
+ __FUNCTION__, hdp->hd_phys_address);
+ iounmap(hdp->hd_address);
+ return -EBUSY;
+ }
+ } else if (res->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) {
+ struct acpi_resource_extended_irq *irqp;
+ int i, irq;
irqp = &res->data.extended_irq;
- if (irqp->number_of_interrupts > 0) {
- hdp->hd_nirqs = irqp->number_of_interrupts;
+ for (i = 0; i < irqp->interrupt_count; i++) {
+ irq = acpi_register_gsi(irqp->interrupts[i],
+ irqp->triggering, irqp->polarity);
+ if (irq < 0)
+ return AE_ERROR;
- for (i = 0; i < hdp->hd_nirqs; i++)
- hdp->hd_irq[i] =
- acpi_register_gsi(irqp->interrupts[i],
- irqp->edge_level,
- irqp->active_high_low);
+ hdp->hd_irq[hdp->hd_nirqs] = irq;
+ hdp->hd_nirqs++;
}
}
return AE_OK;
}
-static int __init hpet_acpi_add(struct acpi_device *device)
+static int hpet_acpi_add(struct acpi_device *device)
{
acpi_status result;
struct hpet_data data;
return hpet_alloc(&data);
}
-static int __init hpet_acpi_remove(struct acpi_device *device, int type)
+static int hpet_acpi_remove(struct acpi_device *device, int type)
{
- return 0;
+ /* XXX need to unregister interpolator, dealloc mem, etc */
+ return -EINVAL;
}
-static struct acpi_driver hpet_acpi_driver __initdata = {
+static struct acpi_driver hpet_acpi_driver = {
.name = "hpet",
- .class = "",
.ids = "PNP0103",
.ops = {
.add = hpet_acpi_add,
static int __init hpet_init(void)
{
- (void)acpi_bus_register_driver(&hpet_acpi_driver);
+ int result;
+
+ result = misc_register(&hpet_misc);
+ if (result < 0)
+ return -ENODEV;
- if (hpets) {
- if (misc_register(&hpet_misc))
- return -ENODEV;
+ sysctl_header = register_sysctl_table(dev_root, 0);
- sysctl_header = register_sysctl_table(dev_root, 0);
+ result = acpi_bus_register_driver(&hpet_acpi_driver);
+ if (result < 0) {
+ if (sysctl_header)
+ unregister_sysctl_table(sysctl_header);
+ misc_deregister(&hpet_misc);
+ return result;
+ }
-#ifdef CONFIG_TIME_INTERPOLATION
- {
- struct hpet *hpet;
-
- hpet = hpets->hp_hpet;
- hpet_cycles_per_sec = hpet_time_div(hpets->hp_period);
- hpet_interpolator.frequency = hpet_cycles_per_sec;
- hpet_interpolator.drift = hpet_cycles_per_sec *
- HPET_DRIFT / 1000000;
- hpet_nsecs_per_cycle = 1000000000 / hpet_cycles_per_sec;
- register_time_interpolator(&hpet_interpolator);
- }
-#endif
- return 0;
- } else
- return -ENODEV;
+ return 0;
}
static void __exit hpet_exit(void)
{
acpi_bus_unregister_driver(&hpet_acpi_driver);
- if (hpets)
+ if (sysctl_header)
unregister_sysctl_table(sysctl_header);
+ misc_deregister(&hpet_misc);
return;
}
git://git.onelab.eu / linux-2.6.git / blobdiff