* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/config.h>
#include <linux/console.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/hvconsole.h>
-#include <asm/vio.h>
#define HVC_MAJOR 229
#define HVC_MINOR 0
char outbuf[N_OUTBUF] __ALIGNED__;
int n_outbuf;
uint32_t vtermno;
+ struct hv_ops *ops;
int irq_requested;
int irq;
struct list_head next;
struct kobject kobj; /* ref count & hvc_struct lifetime */
- struct vio_dev *vdev;
};
/* dynamic list of hvc_struct instances */
* console interfaces but can still be used as a tty device. This has to be
* static because kmalloc will not work during early console init.
*/
-static uint32_t vtermnos[MAX_NR_HVC_CONSOLES];
-
-/* Used for accounting purposes */
-static int num_vterms = 0;
+static struct hv_ops *cons_ops[MAX_NR_HVC_CONSOLES];
+static uint32_t vtermnos[MAX_NR_HVC_CONSOLES] =
+ {[0 ... MAX_NR_HVC_CONSOLES - 1] = -1};
/*
* Console APIs, NOT TTY. These APIs are available immediately when
{
char c[16] __ALIGNED__;
unsigned i = 0, n = 0;
- int r, donecr = 0;
+ int r, donecr = 0, index = co->index;
/* Console access attempt outside of acceptable console range. */
- if (co->index >= MAX_NR_HVC_CONSOLES)
+ if (index >= MAX_NR_HVC_CONSOLES)
return;
/* This console adapter was removed so it is not useable. */
- if (vtermnos[co->index] < 0)
+ if (vtermnos[index] < 0)
return;
while (count > 0 || i > 0) {
--count;
}
} else {
- r = hvc_put_chars(vtermnos[co->index], c, i);
+ r = cons_ops[index]->put_chars(vtermnos[index], c, i);
if (r < 0) {
/* throw away chars on error */
i = 0;
static struct tty_driver *hvc_console_device(struct console *c, int *index)
{
+ if (vtermnos[c->index] == -1)
+ return NULL;
+
*index = c->index;
return hvc_driver;
}
static int __init hvc_console_setup(struct console *co, char *options)
{
+ if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
+ return -ENODEV;
+
+ if (vtermnos[co->index] == -1)
+ return -ENODEV;
+
return 0;
}
.index = -1,
};
-/* Early console initialization. Preceeds driver initialization. */
+/*
+ * Early console initialization. Preceeds driver initialization.
+ *
+ * (1) we are first, and the user specified another driver
+ * -- index will remain -1
+ * (2) we are first and the user specified no driver
+ * -- index will be set to 0, then we will fail setup.
+ * (3) we are first and the user specified our driver
+ * -- index will be set to user specified driver, and we will fail
+ * (4) we are after driver, and this initcall will register us
+ * -- if the user didn't specify a driver then the console will match
+ *
+ * Note that for cases 2 and 3, we will match later when the io driver
+ * calls hvc_instantiate() and call register again.
+ */
static int __init hvc_console_init(void)
{
- int i;
-
- for (i=0; i<MAX_NR_HVC_CONSOLES; i++)
- vtermnos[i] = -1;
- num_vterms = hvc_find_vtys();
register_console(&hvc_con_driver);
return 0;
}
* vty adapters do NOT get an hvc_instantiate() callback since they
* appear after early console init.
*/
-int hvc_instantiate(uint32_t vtermno, int index)
+int hvc_instantiate(uint32_t vtermno, int index, struct hv_ops *ops)
{
+ struct hvc_struct *hp;
+
if (index < 0 || index >= MAX_NR_HVC_CONSOLES)
return -1;
if (vtermnos[index] != -1)
return -1;
+ /* make sure no no tty has been registerd in this index */
+ hp = hvc_get_by_index(index);
+ if (hp) {
+ kobject_put(&hp->kobj);
+ return -1;
+ }
+
vtermnos[index] = vtermno;
+ cons_ops[index] = ops;
/* reserve all indices upto and including this index */
if (last_hvc < index)
last_hvc = index;
+ /* if this index is what the user requested, then register
+ * now (setup won't fail at this point). It's ok to just
+ * call register again if previously .setup failed.
+ */
+ if (index == hvc_con_driver.index)
+ register_console(&hvc_con_driver);
+
return 0;
}
+EXPORT_SYMBOL(hvc_instantiate);
/* Wake the sleeping khvcd */
static void hvc_kick(void)
wake_up_process(hvc_task);
}
+static int hvc_poll(struct hvc_struct *hp);
+
/*
* NOTE: This API isn't used if the console adapter doesn't support interrupts.
* In this case the console is poll driven.
*/
static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
{
- hvc_kick();
+ /* if hvc_poll request a repoll, then kick the hvcd thread */
+ if (hvc_poll(dev_instance))
+ hvc_kick();
return IRQ_HANDLED;
}
} /* else count == 0 */
tty->driver_data = hp;
+ tty->low_latency = 1; /* Makes flushes to ldisc synchronous. */
+
hp->tty = tty;
/* Save for request_irq outside of spin_lock. */
irq = hp->irq;
{
int n;
- n = hvc_put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
+ n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
if (n <= 0) {
if (n == 0)
return;
/* Read data if any */
for (;;) {
- int count = N_INBUF;
- if (count > (TTY_FLIPBUF_SIZE - tty->flip.count))
- count = TTY_FLIPBUF_SIZE - tty->flip.count;
+ int count = tty_buffer_request_room(tty, N_INBUF);
/* If flip is full, just reschedule a later read */
if (count == 0) {
break;
}
- n = hvc_get_chars(hp->vtermno, buf, count);
+ n = hp->ops->get_chars(hp->vtermno, buf, count);
if (n <= 0) {
/* Hangup the tty when disconnected from host */
if (n == -EPIPE) {
}
for (i = 0; i < n; ++i) {
#ifdef CONFIG_MAGIC_SYSRQ
- /* Handle the SysRq Hack */
- if (buf[i] == '\x0f') { /* ^O -- should support a sequence */
- sysrq_pressed = 1;
- continue;
- } else if (sysrq_pressed) {
- handle_sysrq(buf[i], NULL, tty);
- sysrq_pressed = 0;
- continue;
+ if (hp->index == hvc_con_driver.index) {
+ /* Handle the SysRq Hack */
+ /* XXX should support a sequence */
+ if (buf[i] == '\x0f') { /* ^O */
+ sysrq_pressed = 1;
+ continue;
+ } else if (sysrq_pressed) {
+ handle_sysrq(buf[i], NULL, tty);
+ sysrq_pressed = 0;
+ continue;
+ }
}
#endif /* CONFIG_MAGIC_SYSRQ */
tty_insert_flip_char(tty, buf[i], 0);
}
- if (tty->flip.count)
- tty_schedule_flip(tty);
-
/*
* Account for the total amount read in one loop, and if above
- * 64 bytes, we do a quick schedule loop to let the tty grok the
- * data and eventually throttle us.
+ * 64 bytes, we do a quick schedule loop to let the tty grok
+ * the data and eventually throttle us.
*/
read_total += n;
if (read_total >= 64) {
bail:
spin_unlock_irqrestore(&hp->lock, flags);
+ if (read_total)
+ tty_flip_buffer_push(tty);
+
return poll_mask;
}
if (cpus_empty(cpus_in_xmon)) {
spin_lock(&hvc_structs_lock);
list_for_each_entry(hp, &hvc_structs, next) {
- /*hp = list_entry(node, struct hvc_struct, * next); */
poll_mask |= hvc_poll(hp);
}
spin_unlock(&hvc_structs_lock);
.release = destroy_hvc_struct,
};
-static int __devinit hvc_probe(
- struct vio_dev *dev,
- const struct vio_device_id *id)
+struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq,
+ struct hv_ops *ops)
{
struct hvc_struct *hp;
int i;
- /* probed with invalid parameters. */
- if (!dev || !id)
- return -EPERM;
-
hp = kmalloc(sizeof(*hp), GFP_KERNEL);
if (!hp)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
memset(hp, 0x00, sizeof(*hp));
- hp->vtermno = dev->unit_address;
- hp->vdev = dev;
- hp->vdev->dev.driver_data = hp;
- hp->irq = dev->irq;
+
+ hp->vtermno = vtermno;
+ hp->irq = irq;
+ hp->ops = ops;
kobject_init(&hp->kobj);
hp->kobj.ktype = &hvc_kobj_type;
list_add_tail(&(hp->next), &hvc_structs);
spin_unlock(&hvc_structs_lock);
- return 0;
+ return hp;
}
+EXPORT_SYMBOL(hvc_alloc);
-static int __devexit hvc_remove(struct vio_dev *dev)
+int __devexit hvc_remove(struct hvc_struct *hp)
{
- struct hvc_struct *hp = dev->dev.driver_data;
unsigned long flags;
struct kobject *kobjp;
struct tty_struct *tty;
tty_hangup(tty);
return 0;
}
-
-char hvc_driver_name[] = "hvc_console";
-
-static struct vio_device_id hvc_driver_table[] __devinitdata= {
- {"serial", "hvterm1"},
- { NULL, }
-};
-MODULE_DEVICE_TABLE(vio, hvc_driver_table);
-
-static struct vio_driver hvc_vio_driver = {
- .name = hvc_driver_name,
- .id_table = hvc_driver_table,
- .probe = hvc_probe,
- .remove = hvc_remove,
-};
+EXPORT_SYMBOL(hvc_remove);
/* Driver initialization. Follow console initialization. This is where the TTY
* interfaces start to become available. */
int __init hvc_init(void)
{
- int rc;
-
- /* We need more than num_vterms adapters due to hotplug additions. */
+ /* We need more than hvc_count adapters due to hotplug additions. */
hvc_driver = alloc_tty_driver(HVC_ALLOC_TTY_ADAPTERS);
- /* hvc_driver = alloc_tty_driver(num_vterms); */
if (!hvc_driver)
return -ENOMEM;
hvc_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(hvc_driver, &hvc_ops);
- if (tty_register_driver(hvc_driver))
- panic("Couldn't register hvc console driver\n");
-
/* Always start the kthread because there can be hotplug vty adapters
* added later. */
hvc_task = kthread_run(khvcd, NULL, "khvcd");
return -EIO;
}
- /* Register as a vio device to receive callbacks */
- rc = vio_register_driver(&hvc_vio_driver);
+ if (tty_register_driver(hvc_driver))
+ panic("Couldn't register hvc console driver\n");
- return rc;
+ return 0;
}
module_init(hvc_init);
-/* This isn't particularily necessary due to this being a console driver but it
- * is nice to be thorough */
+/* This isn't particularily necessary due to this being a console driver
+ * but it is nice to be thorough.
+ */
static void __exit hvc_exit(void)
{
kthread_stop(hvc_task);
- vio_unregister_driver(&hvc_vio_driver);
tty_unregister_driver(hvc_driver);
/* return tty_struct instances allocated in hvc_init(). */
put_tty_driver(hvc_driver);
+ unregister_console(&hvc_con_driver);
}
module_exit(hvc_exit);
projects / linux-2.6-omap-h63xx.git / blobdiff