mtd: add support for switching old SST chips into QRY mode

[safe/jmp/linux-2.6] / drivers / char / hvc_xen.c

diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c
index 2413af3..eba999f 100644 (file)
--- a/drivers/char/hvc_xen.c
+++ b/drivers/char/hvc_xen.c
@@ -39,9 +39,14 @@ static int xencons_irq;
 
 /* ------------------------------------------------------------------ */
 
+static unsigned long console_pfn = ~0ul;
+
 static inline struct xencons_interface *xencons_interface(void)
 {
-       return mfn_to_virt(xen_start_info->console.domU.mfn);
+       if (console_pfn == ~0ul)
+               return mfn_to_virt(xen_start_info->console.domU.mfn);
+       else
+               return __va(console_pfn << PAGE_SHIFT);
 }
 
 static inline void notify_daemon(void)
@@ -95,26 +100,41 @@ static int read_console(uint32_t vtermno, char *buf, int len)
 static struct hv_ops hvc_ops = {
        .get_chars = read_console,
        .put_chars = write_console,
+       .notifier_add = notifier_add_irq,
+       .notifier_del = notifier_del_irq,
+       .notifier_hangup = notifier_hangup_irq,
 };
 
 static int __init xen_init(void)
 {
        struct hvc_struct *hp;
 
-       if (!is_running_on_xen())
-               return 0;
+       if (!xen_pv_domain() ||
+           xen_initial_domain() ||
+           !xen_start_info->console.domU.evtchn)
+               return -ENODEV;
 
        xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
        if (xencons_irq < 0)
-               xencons_irq = 0 /* NO_IRQ */;
+               xencons_irq = 0; /* NO_IRQ */
+
        hp = hvc_alloc(HVC_COOKIE, xencons_irq, &hvc_ops, 256);
        if (IS_ERR(hp))
                return PTR_ERR(hp);
 
        hvc = hp;
+
+       console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
+
        return 0;
 }
 
+void xen_console_resume(void)
+{
+       if (xencons_irq)
+               rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
+}
+
 static void __exit xen_fini(void)
 {
        if (hvc)
@@ -123,7 +143,7 @@ static void __exit xen_fini(void)
 
 static int xen_cons_init(void)
 {
-       if (!is_running_on_xen())
+       if (!xen_pv_domain())
                return 0;
 
        hvc_instantiate(HVC_COOKIE, 0, &hvc_ops);
@@ -155,6 +175,7 @@ static void xenboot_write_console(struct console *console, const char *string,
 
        raw_console_write(string, len);
 
+       write_console(0, "(early) ", 8);
        while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
                linelen = pos-string+off;
                if (off + linelen > len)