diff options
Diffstat (limited to 'drivers/tty/hvc')
| -rw-r--r-- | drivers/tty/hvc/hvc_console.c | 33 | ||||
| -rw-r--r-- | drivers/tty/hvc/hvc_vio.c | 123 |
2 files changed, 96 insertions, 60 deletions
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c index 4a652999380f..a5dec1ca1b82 100644 --- a/drivers/tty/hvc/hvc_console.c +++ b/drivers/tty/hvc/hvc_console.c @@ -245,6 +245,20 @@ static void hvc_port_destruct(struct tty_port *port) kfree(hp); } +static void hvc_check_console(int index) +{ + /* Already enabled, bail out */ + if (hvc_console.flags & CON_ENABLED) + return; + + /* 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_console.index) + register_console(&hvc_console); +} + /* * hvc_instantiate() is an early console discovery method which locates * consoles * prior to the vio subsystem discovering them. Hotplugged @@ -275,12 +289,8 @@ int hvc_instantiate(uint32_t vtermno, int index, const struct hv_ops *ops) 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_console.index) - register_console(&hvc_console); + /* check if we need to re-register the kernel console */ + hvc_check_console(index); return 0; } @@ -877,10 +887,15 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data, i = ++last_hvc; hp->index = i; + cons_ops[i] = ops; + vtermnos[i] = vtermno; list_add_tail(&(hp->next), &hvc_structs); spin_unlock(&hvc_structs_lock); + /* check if we need to re-register the kernel console */ + hvc_check_console(i); + return hp; } EXPORT_SYMBOL_GPL(hvc_alloc); @@ -893,8 +908,12 @@ int hvc_remove(struct hvc_struct *hp) tty = tty_port_tty_get(&hp->port); spin_lock_irqsave(&hp->lock, flags); - if (hp->index < MAX_NR_HVC_CONSOLES) + if (hp->index < MAX_NR_HVC_CONSOLES) { + console_lock(); vtermnos[hp->index] = -1; + cons_ops[hp->index] = NULL; + console_unlock(); + } /* Don't whack hp->irq because tty_hangup() will need to free the irq. */ diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c index ee307799271a..070c0ee68642 100644 --- a/drivers/tty/hvc/hvc_vio.c +++ b/drivers/tty/hvc/hvc_vio.c @@ -230,6 +230,69 @@ static const struct hv_ops hvterm_hvsi_ops = { .tiocmset = hvterm_hvsi_tiocmset, }; +static void udbg_hvc_putc(char c) +{ + int count = -1; + + if (!hvterm_privs[0]) + return; + + if (c == '\n') + udbg_hvc_putc('\r'); + + do { + switch(hvterm_privs[0]->proto) { + case HV_PROTOCOL_RAW: + count = hvterm_raw_put_chars(0, &c, 1); + break; + case HV_PROTOCOL_HVSI: + count = hvterm_hvsi_put_chars(0, &c, 1); + break; + } + } while(count == 0); +} + +static int udbg_hvc_getc_poll(void) +{ + int rc = 0; + char c; + + if (!hvterm_privs[0]) + return -1; + + switch(hvterm_privs[0]->proto) { + case HV_PROTOCOL_RAW: + rc = hvterm_raw_get_chars(0, &c, 1); + break; + case HV_PROTOCOL_HVSI: + rc = hvterm_hvsi_get_chars(0, &c, 1); + break; + } + if (!rc) + return -1; + return c; +} + +static int udbg_hvc_getc(void) +{ + int ch; + + if (!hvterm_privs[0]) + return -1; + + for (;;) { + ch = udbg_hvc_getc_poll(); + if (ch == -1) { + /* This shouldn't be needed...but... */ + volatile unsigned long delay; + for (delay=0; delay < 2000000; delay++) + ; + } else { + return ch; + } + } +} + static int __devinit hvc_vio_probe(struct vio_dev *vdev, const struct vio_device_id *id) { @@ -289,6 +352,13 @@ static int __devinit hvc_vio_probe(struct vio_dev *vdev, return PTR_ERR(hp); dev_set_drvdata(&vdev->dev, hp); + /* register udbg if it's not there already for console 0 */ + if (hp->index == 0 && !udbg_putc) { + udbg_putc = udbg_hvc_putc; + udbg_getc = udbg_hvc_getc; + udbg_getc_poll = udbg_hvc_getc_poll; + } + return 0; } @@ -331,59 +401,6 @@ static void __exit hvc_vio_exit(void) } module_exit(hvc_vio_exit); -static void udbg_hvc_putc(char c) -{ - int count = -1; - - if (c == '\n') - udbg_hvc_putc('\r'); - - do { - switch(hvterm_priv0.proto) { - case HV_PROTOCOL_RAW: - count = hvterm_raw_put_chars(0, &c, 1); - break; - case HV_PROTOCOL_HVSI: - count = hvterm_hvsi_put_chars(0, &c, 1); - break; - } - } while(count == 0); -} - -static int udbg_hvc_getc_poll(void) -{ - int rc = 0; - char c; - - switch(hvterm_priv0.proto) { - case HV_PROTOCOL_RAW: - rc = hvterm_raw_get_chars(0, &c, 1); - break; - case HV_PROTOCOL_HVSI: - rc = hvterm_hvsi_get_chars(0, &c, 1); - break; - } - if (!rc) - return -1; - return c; -} - -static int udbg_hvc_getc(void) -{ - int ch; - for (;;) { - ch = udbg_hvc_getc_poll(); - if (ch == -1) { - /* This shouldn't be needed...but... */ - volatile unsigned long delay; - for (delay=0; delay < 2000000; delay++) - ; - } else { - return ch; - } - } -} - void __init hvc_vio_init_early(void) { struct device_node *stdout_node; |