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[Qemu-devel] [PATCH] Add support for parallel port interrupts
From: |
Vijay Kumar |
Subject: |
[Qemu-devel] [PATCH] Add support for parallel port interrupts |
Date: |
Tue, 21 Apr 2009 19:45:24 +0530 |
User-agent: |
Icedove 1.5.0.10 (X11/20070328) |
Implement the interrupt chain for parallel ports. Receive interrupts
from /dev/parportX by registering read handlers. Convert parallel port
interrupts to char events (PPINT). Handle the event in the simulated
parallel port and raise the interrupt to the guest.
Signed-off-by: Vijay Kumar B. <address@hidden>
Index: qemu/hw/parallel.c
===================================================================
--- qemu.orig/hw/parallel.c 2009-04-21 19:14:34.000000000 +0530
+++ qemu/hw/parallel.c 2009-04-21 19:19:50.000000000 +0530
@@ -86,6 +86,22 @@
qemu_irq_lower(s->irq);
}
+static void parallel_event(void *opaque, int event)
+{
+ int i;
+ int irqc;
+ ParallelState *s = opaque;
+
+ pdebug("event %x\n", event);
+
+ if (event == CHR_EVENT_PPINT) {
+ /* Generate a pulse for each interrupt received. */
+ qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_CLEAR_INT, &irqc);
+ for (i = 0; i < irqc; i++)
+ qemu_irq_pulse(s->irq);
+ }
+}
+
static void
parallel_ioport_write_sw(void *opaque, uint32_t addr, uint32_t val)
{
@@ -165,6 +181,14 @@
parm &= ~PARA_CTR_DIR;
}
+ if ((val & PARA_CTR_INTEN) != (s->control & PARA_CTR_INTEN)) {
+ if (val & PARA_CTR_INTEN) {
+ qemu_chr_add_handlers(s->chr, NULL, NULL, parallel_event, s);
+ } else {
+ qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL);
+ }
+ }
+
qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &parm);
s->control = val;
break;
Index: qemu/qemu-char.h
===================================================================
--- qemu.orig/qemu-char.h 2009-04-21 19:14:34.000000000 +0530
+++ qemu/qemu-char.h 2009-04-21 19:14:41.000000000 +0530
@@ -11,6 +11,7 @@
#define CHR_EVENT_RESET 2 /* new connection established */
#define CHR_EVENT_MUX_IN 3 /* mux-focus was set to this terminal */
#define CHR_EVENT_MUX_OUT 4 /* mux-focus will move on */
+#define CHR_EVENT_PPINT 5 /* parallel port interrupt occured */
#define CHR_IOCTL_SERIAL_SET_PARAMS 1
@@ -37,6 +38,8 @@
#define CHR_IOCTL_SERIAL_SET_TIOCM 13
#define CHR_IOCTL_SERIAL_GET_TIOCM 14
+#define CHR_IOCTL_PP_CLEAR_INT 15
+
#define CHR_TIOCM_CTS 0x020
#define CHR_TIOCM_CAR 0x040
#define CHR_TIOCM_DSR 0x100
Index: qemu/qemu-char.c
===================================================================
--- qemu.orig/qemu-char.c 2009-04-21 19:14:34.000000000 +0530
+++ qemu/qemu-char.c 2009-04-21 19:17:00.000000000 +0530
@@ -1202,6 +1202,10 @@
if (ioctl(fd, PPDATADIR, (int *)arg) < 0)
return -ENOTSUP;
break;
+ case CHR_IOCTL_PP_CLEAR_INT:
+ if (ioctl(fd, PPCLRIRQ, (int *)arg) < 0)
+ return -ENOTSUP;
+ break;
case CHR_IOCTL_PP_EPP_READ_ADDR:
if (pp_hw_mode(drv, IEEE1284_MODE_EPP|IEEE1284_ADDR)) {
struct ParallelIOArg *parg = arg;
@@ -1244,11 +1248,34 @@
return 0;
}
+/* When poll()ed, /dev/parportX reports a read event when an interrupt
+ * occurs. We register a handler pp_int_notify() to receive interrupt
+ * notifications. The character event mechanism is then used for
+ * reporting interrupts to the hw peripherals.
+ */
+
+static void pp_int_notify(void *opaque)
+{
+ CharDriverState *chr = opaque;
+ qemu_chr_event(chr, CHR_EVENT_PPINT);
+}
+
+static void pp_chr_update_read_handler(CharDriverState *chr)
+{
+ ParallelCharDriver *s = chr->opaque;
+
+ if (chr->chr_event == NULL)
+ qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
+ else
+ qemu_set_fd_handler(s->fd, pp_int_notify, NULL, chr);
+}
+
static void pp_close(CharDriverState *chr)
{
ParallelCharDriver *drv = chr->opaque;
int fd = drv->fd;
+ qemu_set_fd_handler(fd, NULL, NULL, NULL);
pp_hw_mode(drv, IEEE1284_MODE_COMPAT);
ioctl(fd, PPRELEASE);
close(fd);
@@ -1278,6 +1305,7 @@
chr->chr_write = null_chr_write;
chr->chr_ioctl = pp_ioctl;
chr->chr_close = pp_close;
+ chr->chr_update_read_handler = pp_chr_update_read_handler;
chr->opaque = drv;
qemu_chr_reset(chr);
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