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-rw-r--r--drivers/tty/hvc/Kconfig5
-rw-r--r--drivers/tty/hvc/Makefile3
-rw-r--r--drivers/tty/hvc/hvc_console.c70
-rw-r--r--drivers/tty/hvc/hvc_console.h4
-rw-r--r--drivers/tty/hvc/hvc_vio.c408
-rw-r--r--drivers/tty/hvc/hvsi.c129
-rw-r--r--drivers/tty/hvc/hvsi_lib.c426
7 files changed, 897 insertions, 148 deletions
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index 6f2c9809f1f..e371753ba92 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -19,6 +19,11 @@ config HVC_CONSOLE
console. This driver allows each pSeries partition to have a console
which is accessed via the HMC.
+config HVC_OLD_HVSI
+ bool "Old driver for pSeries serial port (/dev/hvsi*)"
+ depends on HVC_CONSOLE
+ default n
+
config HVC_ISERIES
bool "iSeries Hypervisor Virtual Console support"
depends on PPC_ISERIES
diff --git a/drivers/tty/hvc/Makefile b/drivers/tty/hvc/Makefile
index 40a25d93fe5..e2920531637 100644
--- a/drivers/tty/hvc/Makefile
+++ b/drivers/tty/hvc/Makefile
@@ -1,4 +1,5 @@
-obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
+obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi_lib.o
+obj-$(CONFIG_HVC_OLD_HVSI) += hvsi.o
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o
obj-$(CONFIG_HVC_TILE) += hvc_tile.o
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index e9cba13ee80..e1aaf4f309b 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -39,6 +39,7 @@
#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/slab.h>
+#include <linux/serial_core.h>
#include <asm/uaccess.h>
@@ -163,8 +164,10 @@ static void hvc_console_print(struct console *co, const char *b,
} else {
r = cons_ops[index]->put_chars(vtermnos[index], c, i);
if (r <= 0) {
- /* throw away chars on error */
- i = 0;
+ /* throw away characters on error
+ * but spin in case of -EAGAIN */
+ if (r != -EAGAIN)
+ i = 0;
} else if (r > 0) {
i -= r;
if (i > 0)
@@ -184,7 +187,7 @@ static struct tty_driver *hvc_console_device(struct console *c, int *index)
}
static int __init hvc_console_setup(struct console *co, char *options)
-{
+{
if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
return -ENODEV;
@@ -448,7 +451,7 @@ static int hvc_push(struct hvc_struct *hp)
n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
if (n <= 0) {
- if (n == 0) {
+ if (n == 0 || n == -EAGAIN) {
hp->do_wakeup = 1;
return 0;
}
@@ -745,6 +748,58 @@ static int khvcd(void *unused)
return 0;
}
+static int hvc_tiocmget(struct tty_struct *tty)
+{
+ struct hvc_struct *hp = tty->driver_data;
+
+ if (!hp || !hp->ops->tiocmget)
+ return -EINVAL;
+ return hp->ops->tiocmget(hp);
+}
+
+static int hvc_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct hvc_struct *hp = tty->driver_data;
+
+ if (!hp || !hp->ops->tiocmset)
+ return -EINVAL;
+ return hp->ops->tiocmset(hp, set, clear);
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+int hvc_poll_init(struct tty_driver *driver, int line, char *options)
+{
+ return 0;
+}
+
+static int hvc_poll_get_char(struct tty_driver *driver, int line)
+{
+ struct tty_struct *tty = driver->ttys[0];
+ struct hvc_struct *hp = tty->driver_data;
+ int n;
+ char ch;
+
+ n = hp->ops->get_chars(hp->vtermno, &ch, 1);
+
+ if (n == 0)
+ return NO_POLL_CHAR;
+
+ return ch;
+}
+
+static void hvc_poll_put_char(struct tty_driver *driver, int line, char ch)
+{
+ struct tty_struct *tty = driver->ttys[0];
+ struct hvc_struct *hp = tty->driver_data;
+ int n;
+
+ do {
+ n = hp->ops->put_chars(hp->vtermno, &ch, 1);
+ } while (n <= 0);
+}
+#endif
+
static const struct tty_operations hvc_ops = {
.open = hvc_open,
.close = hvc_close,
@@ -753,6 +808,13 @@ static const struct tty_operations hvc_ops = {
.unthrottle = hvc_unthrottle,
.write_room = hvc_write_room,
.chars_in_buffer = hvc_chars_in_buffer,
+ .tiocmget = hvc_tiocmget,
+ .tiocmset = hvc_tiocmset,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_init = hvc_poll_init,
+ .poll_get_char = hvc_poll_get_char,
+ .poll_put_char = hvc_poll_put_char,
+#endif
};
struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
index 54381eba4e4..c335a1492a5 100644
--- a/drivers/tty/hvc/hvc_console.h
+++ b/drivers/tty/hvc/hvc_console.h
@@ -73,6 +73,10 @@ struct hv_ops {
int (*notifier_add)(struct hvc_struct *hp, int irq);
void (*notifier_del)(struct hvc_struct *hp, int irq);
void (*notifier_hangup)(struct hvc_struct *hp, int irq);
+
+ /* tiocmget/set implementation */
+ int (*tiocmget)(struct hvc_struct *hp);
+ int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
};
/* Register a vterm and a slot index for use as a console (console_init) */
diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
index e6eea148524..130aace67f3 100644
--- a/drivers/tty/hvc/hvc_vio.c
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -27,15 +27,27 @@
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * TODO:
+ *
+ * - handle error in sending hvsi protocol packets
+ * - retry nego on subsequent sends ?
*/
+#undef DEBUG
+
#include <linux/types.h>
#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/console.h>
#include <asm/hvconsole.h>
#include <asm/vio.h>
#include <asm/prom.h>
#include <asm/firmware.h>
+#include <asm/hvsi.h>
+#include <asm/udbg.h>
#include "hvc_console.h"
@@ -43,59 +55,236 @@ static const char hvc_driver_name[] = "hvc_console";
static struct vio_device_id hvc_driver_table[] __devinitdata = {
{"serial", "hvterm1"},
+#ifndef HVC_OLD_HVSI
+ {"serial", "hvterm-protocol"},
+#endif
{ "", "" }
};
MODULE_DEVICE_TABLE(vio, hvc_driver_table);
-static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
+typedef enum hv_protocol {
+ HV_PROTOCOL_RAW,
+ HV_PROTOCOL_HVSI
+} hv_protocol_t;
+
+struct hvterm_priv {
+ u32 termno; /* HV term number */
+ hv_protocol_t proto; /* Raw data or HVSI packets */
+ struct hvsi_priv hvsi; /* HVSI specific data */
+ spinlock_t buf_lock;
+ char buf[SIZE_VIO_GET_CHARS];
+ int left;
+ int offset;
+};
+static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
+/* For early boot console */
+static struct hvterm_priv hvterm_priv0;
+
+static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
{
- unsigned long got;
- int i;
+ struct hvterm_priv *pv = hvterm_privs[vtermno];
+ unsigned long i;
+ unsigned long flags;
+ int got;
- /*
- * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
- * so we play safe and avoid the situation where got > count which could
- * overload the flip buffer.
- */
- if (count < SIZE_VIO_GET_CHARS)
- return -EAGAIN;
+ if (WARN_ON(!pv))
+ return 0;
- got = hvc_get_chars(vtermno, buf, count);
+ spin_lock_irqsave(&pv->buf_lock, flags);
- /*
- * Work around a HV bug where it gives us a null
- * after every \r. -- paulus
- */
- for (i = 1; i < got; ++i) {
- if (buf[i] == 0 && buf[i-1] == '\r') {
- --got;
- if (i < got)
- memmove(&buf[i], &buf[i+1],
- got - i);
+ if (pv->left == 0) {
+ pv->offset = 0;
+ pv->left = hvc_get_chars(pv->termno, pv->buf, count);
+
+ /*
+ * Work around a HV bug where it gives us a null
+ * after every \r. -- paulus
+ */
+ for (i = 1; i < pv->left; ++i) {
+ if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
+ --pv->left;
+ if (i < pv->left) {
+ memmove(&pv->buf[i], &pv->buf[i+1],
+ pv->left - i);
+ }
+ }
}
}
+
+ got = min(count, pv->left);
+ memcpy(buf, &pv->buf[pv->offset], got);
+ pv->offset += got;
+ pv->left -= got;
+
+ spin_unlock_irqrestore(&pv->buf_lock, flags);
+
return got;
}
-static const struct hv_ops hvc_get_put_ops = {
- .get_chars = filtered_get_chars,
- .put_chars = hvc_put_chars,
+static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
+{
+ struct hvterm_priv *pv = hvterm_privs[vtermno];
+
+ if (WARN_ON(!pv))
+ return 0;
+
+ return hvc_put_chars(pv->termno, buf, count);
+}
+
+static const struct hv_ops hvterm_raw_ops = {
+ .get_chars = hvterm_raw_get_chars,
+ .put_chars = hvterm_raw_put_chars,
.notifier_add = notifier_add_irq,
.notifier_del = notifier_del_irq,
.notifier_hangup = notifier_hangup_irq,
};
+static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
+{
+ struct hvterm_priv *pv = hvterm_privs[vtermno];
+
+ if (WARN_ON(!pv))
+ return 0;
+
+ return hvsilib_get_chars(&pv->hvsi, buf, count);
+}
+
+static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
+{
+ struct hvterm_priv *pv = hvterm_privs[vtermno];
+
+ if (WARN_ON(!pv))
+ return 0;
+
+ return hvsilib_put_chars(&pv->hvsi, buf, count);
+}
+
+static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
+{
+ struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
+ int rc;
+
+ pr_devel("HVSI@%x: open !\n", pv->termno);
+
+ rc = notifier_add_irq(hp, data);
+ if (rc)
+ return rc;
+
+ return hvsilib_open(&pv->hvsi, hp);
+}
+
+static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
+{
+ struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
+
+ pr_devel("HVSI@%x: do close !\n", pv->termno);
+
+ hvsilib_close(&pv->hvsi, hp);
+
+ notifier_del_irq(hp, data);
+}
+
+void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
+{
+ struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
+
+ pr_devel("HVSI@%x: do hangup !\n", pv->termno);
+
+ hvsilib_close(&pv->hvsi, hp);
+
+ notifier_hangup_irq(hp, data);
+}
+
+static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
+{
+ struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
+
+ if (!pv)
+ return -EINVAL;
+ return pv->hvsi.mctrl;
+}
+
+static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
+ unsigned int clear)
+{
+ struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
+
+ pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
+ pv->termno, set, clear);
+
+ if (set & TIOCM_DTR)
+ hvsilib_write_mctrl(&pv->hvsi, 1);
+ else if (clear & TIOCM_DTR)
+ hvsilib_write_mctrl(&pv->hvsi, 0);
+
+ return 0;
+}
+
+static const struct hv_ops hvterm_hvsi_ops = {
+ .get_chars = hvterm_hvsi_get_chars,
+ .put_chars = hvterm_hvsi_put_chars,
+ .notifier_add = hvterm_hvsi_open,
+ .notifier_del = hvterm_hvsi_close,
+ .notifier_hangup = hvterm_hvsi_hangup,
+ .tiocmget = hvterm_hvsi_tiocmget,
+ .tiocmset = hvterm_hvsi_tiocmset,
+};
+
static int __devinit hvc_vio_probe(struct vio_dev *vdev,
- const struct vio_device_id *id)
+ const struct vio_device_id *id)
{
+ const struct hv_ops *ops;
struct hvc_struct *hp;
+ struct hvterm_priv *pv;
+ hv_protocol_t proto;
+ int i, termno = -1;
/* probed with invalid parameters. */
if (!vdev || !id)
return -EPERM;
- hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
- MAX_VIO_PUT_CHARS);
+ if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
+ proto = HV_PROTOCOL_RAW;
+ ops = &hvterm_raw_ops;
+ } else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
+ proto = HV_PROTOCOL_HVSI;
+ ops = &hvterm_hvsi_ops;
+ } else {
+ pr_err("hvc_vio: Unkown protocol for %s\n", vdev->dev.of_node->full_name);
+ return -ENXIO;
+ }
+
+ pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
+ vdev->dev.of_node->full_name,
+ proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
+
+ /* Is it our boot one ? */
+ if (hvterm_privs[0] == &hvterm_priv0 &&
+ vdev->unit_address == hvterm_priv0.termno) {
+ pv = hvterm_privs[0];
+ termno = 0;
+ pr_devel("->boot console, using termno 0\n");
+ }
+ /* nope, allocate a new one */
+ else {
+ for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
+ if (!hvterm_privs[i])
+ termno = i;
+ pr_devel("->non-boot console, using termno %d\n", termno);
+ if (termno < 0)
+ return -ENODEV;
+ pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
+ if (!pv)
+ return -ENOMEM;
+ pv->termno = vdev->unit_address;
+ pv->proto = proto;
+ spin_lock_init(&pv->buf_lock);
+ hvterm_privs[termno] = pv;
+ hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
+ pv->termno, 0);
+ }
+
+ hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
if (IS_ERR(hp))
return PTR_ERR(hp);
dev_set_drvdata(&vdev->dev, hp);
@@ -106,8 +295,16 @@ static int __devinit hvc_vio_probe(struct vio_dev *vdev,
static int __devexit hvc_vio_remove(struct vio_dev *vdev)
{
struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
+ int rc, termno;
- return hvc_remove(hp);
+ termno = hp->vtermno;
+ rc = hvc_remove(hp);
+ if (rc == 0) {
+ if (hvterm_privs[termno] != &hvterm_priv0)
+ kfree(hvterm_privs[termno]);
+ hvterm_privs[termno] = NULL;
+ }
+ return rc;
}
static struct vio_driver hvc_vio_driver = {
@@ -140,34 +337,149 @@ static void __exit hvc_vio_exit(void)
}
module_exit(hvc_vio_exit);
-/* the device tree order defines our numbering */
-static int hvc_find_vtys(void)
+static void udbg_hvc_putc(char c)
{
- struct device_node *vty;
- int num_found = 0;
+ int count = -1;
- for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
- vty = of_find_node_by_name(vty, "vty")) {
- const uint32_t *vtermno;
+ if (c == '\n')
+ udbg_hvc_putc('\r');
- /* We have statically defined space for only a certain number
- * of console adapters.
- */
- if (num_found >= MAX_NR_HVC_CONSOLES) {
- of_node_put(vty);
+ 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;
- vtermno = of_get_property(vty, "reg", NULL);
- if (!vtermno)
- continue;
+ 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;
+}
- if (of_device_is_compatible(vty, "hvterm1")) {
- hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
- ++num_found;
+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;
+ const u32 *termno;
+ const char *name;
+ const struct hv_ops *ops;
+
+ /* find the boot console from /chosen/stdout */
+ if (!of_chosen)
+ return;
+ name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+ if (name == NULL)
+ return;
+ stdout_node = of_find_node_by_path(name);
+ if (!stdout_node)
+ return;
+ name = of_get_property(stdout_node, "name", NULL);
+ if (!name) {
+ printk(KERN_WARNING "stdout node missing 'name' property!\n");
+ goto out;
+ }
+
+ /* Check if it's a virtual terminal */
+ if (strncmp(name, "vty", 3) != 0)
+ goto out;
+ termno = of_get_property(stdout_node, "reg", NULL);
+ if (termno == NULL)
+ goto out;
+ hvterm_priv0.termno = *termno;
+ spin_lock_init(&hvterm_priv0.buf_lock);
+ hvterm_privs[0] = &hvterm_priv0;
+
+ /* Check the protocol */
+ if (of_device_is_compatible(stdout_node, "hvterm1")) {
+ hvterm_priv0.proto = HV_PROTOCOL_RAW;
+ ops = &hvterm_raw_ops;
+ }
+ else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) {
+ hvterm_priv0.proto = HV_PROTOCOL_HVSI;
+ ops = &hvterm_hvsi_ops;
+ hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
+ hvterm_priv0.termno, 1);
+ /* HVSI, perform the handshake now */
+ hvsilib_establish(&hvterm_priv0.hvsi);
+ } else
+ goto out;
+ udbg_putc = udbg_hvc_putc;
+ udbg_getc = udbg_hvc_getc;
+ udbg_getc_poll = udbg_hvc_getc_poll;
+#ifdef HVC_OLD_HVSI
+ /* When using the old HVSI driver don't register the HVC
+ * backend for HVSI, only do udbg
+ */
+ if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
+ goto out;
+#endif
+ add_preferred_console("hvc", 0, NULL);
+ hvc_instantiate(0, 0, ops);
+out:
+ of_node_put(stdout_node);
+}
- return num_found;
+/* call this from early_init() for a working debug console on
+ * vterm capable LPAR machines
+ */
+#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
+void __init udbg_init_debug_lpar(void)
+{
+ hvterm_privs[0] = &hvterm_priv0;
+ hvterm_priv0.termno = 0;
+ hvterm_priv0.proto = HV_PROTOCOL_RAW;
+ spin_lock_init(&hvterm_priv0.buf_lock);
+ udbg_putc = udbg_hvc_putc;
+ udbg_getc = udbg_hvc_getc;
+ udbg_getc_poll = udbg_hvc_getc_poll;
+}
+#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
+void __init udbg_init_debug_lpar_hvsi(void)
+{
+ hvterm_privs[0] = &hvterm_priv0;
+ hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
+ hvterm_priv0.proto = HV_PROTOCOL_HVSI;
+ spin_lock_init(&hvterm_priv0.buf_lock);
+ udbg_putc = udbg_hvc_putc;
+ udbg_getc = udbg_hvc_getc;
+ udbg_getc_poll = udbg_hvc_getc_poll;
+ hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
+ hvterm_priv0.termno, 1);
+ hvsilib_establish(&hvterm_priv0.hvsi);
}
-console_initcall(hvc_find_vtys);
+#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */
diff --git a/drivers/tty/hvc/hvsi.c b/drivers/tty/hvc/hvsi.c
index 8a8d6373f16..c94e2f5853d 100644
--- a/drivers/tty/hvc/hvsi.c
+++ b/drivers/tty/hvc/hvsi.c
@@ -49,6 +49,7 @@
#include <asm/uaccess.h>
#include <asm/vio.h>
#include <asm/param.h>
+#include <asm/hvsi.h>
#define HVSI_MAJOR 229
#define HVSI_MINOR 128
@@ -109,68 +110,6 @@ enum HVSI_PROTOCOL_STATE {
};
#define HVSI_CONSOLE 0x1
-#define VS_DATA_PACKET_HEADER 0xff
-#define VS_CONTROL_PACKET_HEADER 0xfe
-#define VS_QUERY_PACKET_HEADER 0xfd
-#define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
-
-/* control verbs */
-#define VSV_SET_MODEM_CTL 1 /* to service processor only */
-#define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
-#define VSV_CLOSE_PROTOCOL 3
-
-/* query verbs */
-#define VSV_SEND_VERSION_NUMBER 1
-#define VSV_SEND_MODEM_CTL_STATUS 2
-
-/* yes, these masks are not consecutive. */
-#define HVSI_TSDTR 0x01
-#define HVSI_TSCD 0x20
-
-struct hvsi_header {
- uint8_t type;
- uint8_t len;
- uint16_t seqno;
-} __attribute__((packed));
-
-struct hvsi_data {
- uint8_t type;
- uint8_t len;
- uint16_t seqno;
- uint8_t data[HVSI_MAX_OUTGOING_DATA];
-} __attribute__((packed));
-
-struct hvsi_control {
- uint8_t type;
- uint8_t len;
- uint16_t seqno;
- uint16_t verb;
- /* optional depending on verb: */
- uint32_t word;
- uint32_t mask;
-} __attribute__((packed));
-
-struct hvsi_query {
- uint8_t type;
- uint8_t len;
- uint16_t seqno;
- uint16_t verb;
-} __attribute__((packed));
-
-struct hvsi_query_response {
- uint8_t type;
- uint8_t len;
- uint16_t seqno;
- uint16_t verb;
- uint16_t query_seqno;
- union {
- uint8_t version;
- uint32_t mctrl_word;
- } u;
-} __attribute__((packed));
-
-
-
static inline int is_console(struct hvsi_struct *hp)
{
return hp->flags & HVSI_CONSOLE;
@@ -356,18 +295,18 @@ static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno)
struct hvsi_query_response packet __ALIGNED__;
int wrote;
- packet.type = VS_QUERY_RESPONSE_PACKET_HEADER;
- packet.len = sizeof(struct hvsi_query_response);
- packet.seqno = atomic_inc_return(&hp->seqno);
+ packet.hdr.type = VS_QUERY_RESPONSE_PACKET_HEADER;
+ packet.hdr.len = sizeof(struct hvsi_query_response);
+ packet.hdr.seqno = atomic_inc_return(&hp->seqno);
packet.verb = VSV_SEND_VERSION_NUMBER;
packet.u.version = HVSI_VERSION;
packet.query_seqno = query_seqno+1;
- pr_debug("%s: sending %i bytes\n", __func__, packet.len);
- dbg_dump_hex((uint8_t*)&packet, packet.len);
+ pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len);
+ dbg_dump_hex((uint8_t*)&packet, packet.hdr.len);
- wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
- if (wrote != packet.len) {
+ wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len);
+ if (wrote != packet.hdr.len) {
printk(KERN_ERR "hvsi%i: couldn't send query response!\n",
hp->index);
return -EIO;
@@ -382,7 +321,7 @@ static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet)
switch (hp->state) {
case HVSI_WAIT_FOR_VER_QUERY:
- hvsi_version_respond(hp, query->seqno);
+ hvsi_version_respond(hp, query->hdr.seqno);
__set_state(hp, HVSI_OPEN);
break;
default:
@@ -640,16 +579,16 @@ static int hvsi_query(struct hvsi_struct *hp, uint16_t verb)
struct hvsi_query packet __ALIGNED__;
int wrote;
- packet.type = VS_QUERY_PACKET_HEADER;
- packet.len = sizeof(struct hvsi_query);
- packet.seqno = atomic_inc_return(&hp->seqno);
+ packet.hdr.type = VS_QUERY_PACKET_HEADER;
+ packet.hdr.len = sizeof(struct hvsi_query);
+ packet.hdr.seqno = atomic_inc_return(&hp->seqno);
packet.verb = verb;
- pr_debug("%s: sending %i bytes\n", __func__, packet.len);
- dbg_dump_hex((uint8_t*)&packet, packet.len);
+ pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len);
+ dbg_dump_hex((uint8_t*)&packet, packet.hdr.len);
- wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
- if (wrote != packet.len) {
+ wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len);
+ if (wrote != packet.hdr.len) {
printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index,
wrote);
return -EIO;
@@ -683,20 +622,20 @@ static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl)
struct hvsi_control packet __ALIGNED__;
int wrote;
- packet.type = VS_CONTROL_PACKET_HEADER,
- packet.seqno = atomic_inc_return(&hp->seqno);
- packet.len = sizeof(struct hvsi_control);
+ packet.hdr.type = VS_CONTROL_PACKET_HEADER,
+ packet.hdr.seqno = atomic_inc_return(&hp->seqno);
+ packet.hdr.len = sizeof(struct hvsi_control);
packet.verb = VSV_SET_MODEM_CTL;
packet.mask = HVSI_TSDTR;
if (mctrl & TIOCM_DTR)
packet.word = HVSI_TSDTR;
- pr_debug("%s: sending %i bytes\n", __func__, packet.len);
- dbg_dump_hex((uint8_t*)&packet, packet.len);
+ pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len);
+ dbg_dump_hex((uint8_t*)&packet, packet.hdr.len);
- wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
- if (wrote != packet.len) {
+ wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len);
+ if (wrote != packet.hdr.len) {
printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index);
return -EIO;
}
@@ -766,13 +705,13 @@ static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count)
BUG_ON(count > HVSI_MAX_OUTGOING_DATA);
- packet.type = VS_DATA_PACKET_HEADER;
- packet.seqno = atomic_inc_return(&hp->seqno);
- packet.len = count + sizeof(struct hvsi_header);
+ packet.hdr.type = VS_DATA_PACKET_HEADER;
+ packet.hdr.seqno = atomic_inc_return(&hp->seqno);
+ packet.hdr.len = count + sizeof(struct hvsi_header);
memcpy(&packet.data, buf, count);
- ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
- if (ret == packet.len) {
+ ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len);
+ if (ret == packet.hdr.len) {
/* return the number of chars written, not the packet length */
return count;
}
@@ -783,15 +722,15 @@ static void hvsi_close_protocol(struct hvsi_struct *hp)
{
struct hvsi_control packet __ALIGNED__;
- packet.type = VS_CONTROL_PACKET_HEADER;
- packet.seqno = atomic_inc_return(&hp->seqno);
- packet.len = 6;
+ packet.hdr.type = VS_CONTROL_PACKET_HEADER;
+ packet.hdr.seqno = atomic_inc_return(&hp->seqno);
+ packet.hdr.len = 6;
packet.verb = VSV_CLOSE_PROTOCOL;
- pr_debug("%s: sending %i bytes\n", __func__, packet.len);
- dbg_dump_hex((uint8_t*)&packet, packet.len);
+ pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len);
+ dbg_dump_hex((uint8_t*)&packet, packet.hdr.len);
- hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
+ hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len);
}
static int hvsi_open(struct tty_struct *tty, struct file *filp)
diff --git a/drivers/tty/hvc/hvsi_lib.c b/drivers/tty/hvc/hvsi_lib.c
new file mode 100644
index 00000000000..bd9b09827b2
--- /dev/null
+++ b/drivers/tty/hvc/hvsi_lib.c
@@ -0,0 +1,426 @@
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/console.h>
+#include <asm/hvsi.h>
+
+#include "hvc_console.h"
+
+static int hvsi_send_packet(struct hvsi_priv *pv, struct hvsi_header *packet)
+{
+ packet->seqno = atomic_inc_return(&pv->seqno);
+
+ /* Assumes that always succeeds, works in practice */
+ return pv->put_chars(pv->termno, (char *)packet, packet->len);
+}
+
+static void hvsi_start_handshake(struct hvsi_priv *pv)
+{
+ struct hvsi_query q;
+
+ /* Reset state */
+ pv->established = 0;
+ atomic_set(&pv->seqno, 0);
+
+ pr_devel("HVSI@%x: Handshaking started\n", pv->termno);
+
+ /* Send version query */
+ q.hdr.type = VS_QUERY_PACKET_HEADER;
+ q.hdr.len = sizeof(struct hvsi_query);
+ q.verb = VSV_SEND_VERSION_NUMBER;
+ hvsi_send_packet(pv, &q.hdr);
+}
+
+static int hvsi_send_close(struct hvsi_priv *pv)
+{
+ struct hvsi_control ctrl;
+
+ pv->established = 0;
+
+ ctrl.hdr.type = VS_CONTROL_PACKET_HEADER;
+ ctrl.hdr.len = sizeof(struct hvsi_control);
+ ctrl.verb = VSV_CLOSE_PROTOCOL;
+ return hvsi_send_packet(pv, &ctrl.hdr);
+}
+
+static void hvsi_cd_change(struct hvsi_priv *pv, int cd)
+{
+ if (cd)
+ pv->mctrl |= TIOCM_CD;
+ else {
+ pv->mctrl &= ~TIOCM_CD;
+
+ /* We copy the existing hvsi driver semantics
+ * here which are to trigger a hangup when
+ * we get a carrier loss.
+ * Closing our connection to the server will
+ * do just that.
+ */
+ if (!pv->is_console && pv->opened) {
+ pr_devel("HVSI@%x Carrier lost, hanging up !\n",
+ pv->termno);
+ hvsi_send_close(pv);
+ }
+ }
+}
+
+static void hvsi_got_control(struct hvsi_priv *pv)
+{
+ struct hvsi_control *pkt = (struct hvsi_control *)pv->inbuf;
+
+ switch (pkt->verb) {
+ case VSV_CLOSE_PROTOCOL:
+ /* We restart the handshaking */
+ hvsi_start_handshake(pv);
+ break;
+ case VSV_MODEM_CTL_UPDATE:
+ /* Transition of carrier detect */
+ hvsi_cd_change(pv, pkt->word & HVSI_TSCD);
+ break;
+ }
+}
+
+static void hvsi_got_query(struct hvsi_priv *pv)
+{
+ struct hvsi_query *pkt = (struct hvsi_query *)pv->inbuf;
+ struct hvsi_query_response r;
+
+ /* We only handle version queries */
+ if (pkt->verb != VSV_SEND_VERSION_NUMBER)
+ return;
+
+ pr_devel("HVSI@%x: Got version query, sending response...\n",
+ pv->termno);
+
+ /* Send version response */
+ r.hdr.type = VS_QUERY_RESPONSE_PACKET_HEADER;
+ r.hdr.len = sizeof(struct hvsi_query_response);
+ r.verb = VSV_SEND_VERSION_NUMBER;
+ r.u.version = HVSI_VERSION;
+ r.query_seqno = pkt->hdr.seqno;
+ hvsi_send_packet(pv, &r.hdr);
+
+ /* Assume protocol is open now */
+ pv->established = 1;
+}
+
+static void hvsi_got_response(struct hvsi_priv *pv)
+{
+ struct hvsi_query_response *r =
+ (struct hvsi_query_response *)pv->inbuf;
+
+ switch(r->verb) {
+ case VSV_SEND_MODEM_CTL_STATUS:
+ hvsi_cd_change(pv, r->u.mctrl_word & HVSI_TSCD);
+ pv->mctrl_update = 1;
+ break;
+ }
+}
+
+static int hvsi_check_packet(struct hvsi_priv *pv)
+{
+ u8 len, type;
+
+ /* Check header validity. If it's invalid, we ditch
+ * the whole buffer and hope we eventually resync
+ */
+ if (pv->inbuf[0] < 0xfc) {
+ pv->inbuf_len = pv->inbuf_pktlen = 0;
+ return 0;
+ }
+ type = pv->inbuf[0];
+ len = pv->inbuf[1];
+
+ /* Packet incomplete ? */
+ if (pv->inbuf_len < len)
+ return 0;
+
+ pr_devel("HVSI@%x: Got packet type %x len %d bytes:\n",
+ pv->termno, type, len);
+
+ /* We have a packet, yay ! Handle it */
+ switch(type) {
+ case VS_DATA_PACKET_HEADER:
+ pv->inbuf_pktlen = len - 4;
+ pv->inbuf_cur = 4;
+ return 1;
+ case VS_CONTROL_PACKET_HEADER:
+ hvsi_got_control(pv);
+ break;
+ case VS_QUERY_PACKET_HEADER:
+ hvsi_got_query(pv);
+ break;
+ case VS_QUERY_RESPONSE_PACKET_HEADER:
+ hvsi_got_response(pv);
+ break;
+ }
+
+ /* Swallow packet and retry */
+ pv->inbuf_len -= len;
+ memmove(pv->inbuf, &pv->inbuf[len], pv->inbuf_len);
+ return 1;
+}
+
+static int hvsi_get_packet(struct hvsi_priv *pv)
+{
+ /* If we have room in the buffer, ask HV for more */
+ if (pv->inbuf_len < HVSI_INBUF_SIZE)
+ pv->inbuf_len += pv->get_chars(pv->termno,
+ &pv->inbuf[pv->inbuf_len],
+ HVSI_INBUF_SIZE - pv->inbuf_len);
+ /*
+ * If we have at least 4 bytes in the buffer, check for
+ * a full packet and retry
+ */
+ if (pv->inbuf_len >= 4)
+ return hvsi_check_packet(pv);
+ return 0;
+}
+
+int hvsilib_get_chars(struct hvsi_priv *pv, char *buf, int count)
+{
+ unsigned int tries, read = 0;
+
+ if (WARN_ON(!pv))
+ return 0;
+
+ /* If we aren't open, don't do anything in order to avoid races
+ * with connection establishment. The hvc core will call this
+ * before we have returned from notifier_add(), and we need to
+ * avoid multiple users playing with the receive buffer
+ */
+ if (!pv->opened)
+ return 0;
+
+ /* We try twice, once with what data we have and once more
+ * after we try to fetch some more from the hypervisor
+ */
+ for (tries = 1; count && tries < 2; tries++) {
+ /* Consume existing data packet */
+ if (pv->inbuf_pktlen) {
+ unsigned int l = min(count, (int)pv->inbuf_pktlen);
+ memcpy(&buf[read], &pv->inbuf[pv->inbuf_cur], l);
+ pv->inbuf_cur += l;
+ pv->inbuf_pktlen -= l;
+ count -= l;
+ read += l;
+ }
+ if (count == 0)
+ break;
+
+ /* Data packet fully consumed, move down remaning data */
+ if (pv->inbuf_cur) {
+ pv->inbuf_len -= pv->inbuf_cur;
+ memmove(pv->inbuf, &pv->inbuf[pv->inbuf_cur],
+ pv->inbuf_len);
+ pv->inbuf_cur = 0;
+ }
+
+ /* Try to get another packet */
+ if (hvsi_get_packet(pv))
+ tries--;
+ }
+ if (!pv->established) {
+ pr_devel("HVSI@%x: returning -EPIPE\n", pv->termno);
+ return -EPIPE;
+ }
+ return read;
+}
+
+int hvsilib_put_chars(struct hvsi_priv *pv, const char *buf, int count)
+{
+ struct hvsi_data dp;
+ int rc, adjcount = min(count, HVSI_MAX_OUTGOING_DATA);
+
+ if (WARN_ON(!pv))
+ return 0;
+
+ dp.hdr.type = VS_DATA_PACKET_HEADER;
+ dp.hdr.len = adjcount + sizeof(struct hvsi_header);
+ memcpy(dp.data, buf, adjcount);
+ rc = hvsi_send_packet(pv, &dp.hdr);
+ if (rc <= 0)
+ return rc;
+ return adjcount;
+}
+
+static void maybe_msleep(unsigned long ms)
+{
+ /* During early boot, IRQs are disabled, use mdelay */
+ if (irqs_disabled())
+ mdelay(ms);
+ else
+ msleep(ms);
+}
+
+int hvsilib_read_mctrl(struct hvsi_priv *pv)
+{
+ struct hvsi_query q;
+ int rc, timeout;
+
+ pr_devel("HVSI@%x: Querying modem control status...\n",
+ pv->termno);
+
+ pv->mctrl_update = 0;
+ q.hdr.type = VS_QUERY_PACKET_HEADER;
+ q.hdr.len = sizeof(struct hvsi_query);
+ q.hdr.seqno = atomic_inc_return(&pv->seqno);
+ q.verb = VSV_SEND_MODEM_CTL_STATUS;
+ rc = hvsi_send_packet(pv, &q.hdr);
+ if (rc <= 0) {
+ pr_devel("HVSI@%x: Error %d...\n", pv->termno, rc);
+ return rc;
+ }
+
+ /* Try for up to 200ms */
+ for (timeout = 0; timeout < 20; timeout++) {
+ if (!pv->established)
+ return -ENXIO;
+ if (pv->mctrl_update)
+ return 0;
+ if (!hvsi_get_packet(pv))
+ maybe_msleep(10);
+ }
+ return -EIO;
+}
+
+int hvsilib_write_mctrl(struct hvsi_priv *pv, int dtr)
+{
+ struct hvsi_control ctrl;
+ unsigned short mctrl;
+
+ mctrl = pv->mctrl;
+ if (dtr)
+ mctrl |= TIOCM_DTR;
+ else
+ mctrl &= ~TIOCM_DTR;
+ if (mctrl == pv->mctrl)
+ return 0;
+ pv->mctrl = mctrl;
+
+ pr_devel("HVSI@%x: %s DTR...\n", pv->termno,
+ dtr ? "Setting" : "Clearing");
+
+ ctrl.hdr.type = VS_CONTROL_PACKET_HEADER,
+ ctrl.hdr.len = sizeof(struct hvsi_control);
+ ctrl.verb = VSV_SET_MODEM_CTL;
+ ctrl.mask = HVSI_TSDTR;
+ ctrl.word = dtr ? HVSI_TSDTR : 0;
+ return hvsi_send_packet(pv, &ctrl.hdr);
+}
+
+void hvsilib_establish(struct hvsi_priv *pv)
+{
+ int timeout;
+
+ pr_devel("HVSI@%x: Establishing...\n", pv->termno);
+
+ /* Try for up to 200ms, there can be a packet to
+ * start the process waiting for us...
+ */
+ for (timeout = 0; timeout < 20; timeout++) {
+ if (pv->established)
+ goto established;
+ if (!hvsi_get_packet(pv))
+ maybe_msleep(10);
+ }
+
+ /* Failed, send a close connection packet just
+ * in case
+ */
+ pr_devel("HVSI@%x: ... sending close\n", pv->termno);
+
+ hvsi_send_close(pv);
+
+ /* Then restart handshake */
+
+ pr_devel("HVSI@%x: ... restarting handshake\n", pv->termno);
+
+ hvsi_start_handshake(pv);
+
+ pr_devel("HVSI@%x: ... waiting handshake\n", pv->termno);
+
+ /* Try for up to 200s */
+ for (timeout = 0; timeout < 20; timeout++) {
+ if (pv->established)
+ goto established;
+ if (!hvsi_get_packet(pv))
+ maybe_msleep(10);
+ }
+
+ if (!pv->established) {
+ pr_devel("HVSI@%x: Timeout handshaking, giving up !\n",
+ pv->termno);
+ return;
+ }
+ established:
+ /* Query modem control lines */
+
+ pr_devel("HVSI@%x: ... established, reading mctrl\n", pv->termno);
+
+ hvsilib_read_mctrl(pv);
+
+ /* Set our own DTR */
+
+ pr_devel("HVSI@%x: ... setting mctrl\n", pv->termno);
+
+ hvsilib_write_mctrl(pv, 1);
+
+ /* Set the opened flag so reads are allowed */
+ wmb();
+ pv->opened = 1;
+}
+
+int hvsilib_open(struct hvsi_priv *pv, struct hvc_struct *hp)
+{
+ pr_devel("HVSI@%x: open !\n", pv->termno);
+
+ /* Keep track of the tty data structure */
+ pv->tty = tty_kref_get(hp->tty);
+
+ hvsilib_establish(pv);
+
+ return 0;
+}
+
+void hvsilib_close(struct hvsi_priv *pv, struct hvc_struct *hp)
+{
+ unsigned long flags;
+
+ pr_devel("HVSI@%x: close !\n", pv->termno);
+
+ if (!pv->is_console) {
+ pr_devel("HVSI@%x: Not a console, tearing down\n",
+ pv->termno);
+
+ /* Clear opened, synchronize with khvcd */
+ spin_lock_irqsave(&hp->lock, flags);
+ pv->opened = 0;
+ spin_unlock_irqrestore(&hp->lock, flags);
+
+ /* Clear our own DTR */
+ if (!pv->tty || (pv->tty->termios->c_cflag & HUPCL))
+ hvsilib_write_mctrl(pv, 0);
+
+ /* Tear down the connection */
+ hvsi_send_close(pv);
+ }
+
+ if (pv->tty)
+ tty_kref_put(pv->tty);
+ pv->tty = NULL;
+}
+
+void hvsilib_init(struct hvsi_priv *pv,
+ int (*get_chars)(uint32_t termno, char *buf, int count),
+ int (*put_chars)(uint32_t termno, const char *buf,
+ int count),
+ int termno, int is_console)
+{
+ memset(pv, 0, sizeof(*pv));
+ pv->get_chars = get_chars;
+ pv->put_chars = put_chars;
+ pv->termno = termno;
+ pv->is_console = is_console;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-19 00:45:42 +0000