[PATCH] powerpc: add hvc backend for rtas

Current Cell hardware is using the console through a set
of rtas calls. This driver is needed to get console
output on those boards.

Signed-off-by: Arnd Bergmann <abergman@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 831419381cf59950935530e711d0029ad1dd4ebf..7a85b3a26ff81d60dd255eb41bddb0ab2f0fcff7 100644 (file)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -579,6 +579,13 @@ config HVC_CONSOLE
          console. This driver allows each pSeries partition to have a console
          which is accessed via the HMC.
 
+config HVC_RTAS
+       bool "IBM RTAS Console support"
+       depends on PPC_RTAS
+       select HVC_DRIVER
+       help
+         IBM Console device driver which makes use of RTAS
+
 config HVCS
        tristate "IBM Hypervisor Virtual Console Server support"
        depends on PPC_PSERIES

diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index e6c03335fd6acb814e1717e7cb656a232c7ae480..a73cb4956928f2b582e08f9af1250c0d30877025 100644 (file)
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_SX)              += sx.o generic_serial.o
 obj-$(CONFIG_RIO)              += rio/ generic_serial.o
 obj-$(CONFIG_HVC_DRIVER)       += hvc_console.o
 obj-$(CONFIG_HVC_CONSOLE)      += hvc_vio.o hvsi.o
+obj-$(CONFIG_HVC_RTAS)         += hvc_rtas.o
 obj-$(CONFIG_RAW_DRIVER)       += raw.o
 obj-$(CONFIG_SGI_SNSC)         += snsc.o snsc_event.o
 obj-$(CONFIG_MMTIMER)          += mmtimer.o

diff --git a/drivers/char/hvc_rtas.c b/drivers/char/hvc_rtas.c
new file mode 100644 (file)
index 0000000..83364ea
--- /dev/null
+++ b/drivers/char/hvc_rtas.c
@@ -0,0 +1,138 @@
+/*
+ * IBM RTAS driver interface to hvc_console.c
+ *
+ * (C) Copyright IBM Corporation 2001-2005
+ * (C) Copyright Red Hat, Inc. 2005
+ *
+ * Author(s): Maximino Augilar <IBM STI Design Center>
+ *         : Ryan S. Arnold <rsa@us.ibm.com>
+ *         : Utz Bacher <utz.bacher@de.ibm.com>
+ *         : David Woodhouse <dwmw2@infradead.org>
+ *
+ *    inspired by drivers/char/hvc_console.c
+ *    written by Anton Blanchard and Paul Mackerras
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include <asm/irq.h>
+#include <asm/rtas.h>
+#include "hvc_console.h"
+
+#define hvc_rtas_cookie 0x67781e15
+struct hvc_struct *hvc_rtas_dev;
+
+#define RTASCONS_PUT_ATTEMPTS  16
+
+static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
+static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
+static int rtascons_put_delay = 100;
+module_param_named(put_delay, rtascons_put_delay, int, 0644);
+
+static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf, int count)
+{
+       int done;
+
+       /* if there is more than one character to be displayed, wait a bit */
+       for (done = 0; done < count; done++) {
+               int result;
+               result = rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[done]);
+               if (result)
+                       break;
+       }
+       /* the calling routine expects to receive the number of bytes sent */
+       return done;
+}
+
+static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
+{
+       int i;
+
+       for (i = 0; i < count; i++) {
+               int c, err;
+
+               err = rtas_call(rtascons_get_char_token, 0, 2, &c);
+               if (err)
+                       break;
+
+               buf[i] = c;
+       }
+
+       return i;
+}
+
+static struct hv_ops hvc_rtas_get_put_ops = {
+       .get_chars = hvc_rtas_read_console,
+       .put_chars = hvc_rtas_write_console,
+};
+
+static int hvc_rtas_init(void)
+{
+       struct hvc_struct *hp;
+
+       if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+               rtascons_put_char_token = rtas_token("put-term-char");
+       if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+               return -EIO;
+
+       if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+               rtascons_get_char_token = rtas_token("get-term-char");
+       if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+               return -EIO;
+
+       BUG_ON(hvc_rtas_dev);
+
+       /* Allocate an hvc_struct for the console device we instantiated
+        * earlier.  Save off hp so that we can return it on exit */
+       hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops);
+       if (IS_ERR(hp))
+               return PTR_ERR(hp);
+       hvc_rtas_dev = hp;
+       return 0;
+}
+module_init(hvc_rtas_init);
+
+/* This will tear down the tty portion of the driver */
+static void __exit hvc_rtas_exit(void)
+{
+       /* Really the fun isn't over until the worker thread breaks down and the
+        * tty cleans up */
+       if (hvc_rtas_dev)
+               hvc_remove(hvc_rtas_dev);
+}
+module_exit(hvc_rtas_exit);
+
+/* This will happen prior to module init.  There is no tty at this time? */
+static int hvc_rtas_console_init(void)
+{
+       rtascons_put_char_token = rtas_token("put-term-char");
+       if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+               return -EIO;
+       rtascons_get_char_token = rtas_token("get-term-char");
+       if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+               return -EIO;
+
+       hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops );
+       add_preferred_console("hvc", 0, NULL);
+       return 0;
+}
+console_initcall(hvc_rtas_console_init);