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path: root/drivers/media/pci/cx18/cx18-irq.c
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Diffstat (limited to 'drivers/media/pci/cx18/cx18-irq.c')
-rw-r--r--drivers/media/pci/cx18/cx18-irq.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/media/pci/cx18/cx18-irq.c b/drivers/media/pci/cx18/cx18-irq.c
new file mode 100644
index 000000000000..80edfe93a3d8
--- /dev/null
+++ b/drivers/media/pci/cx18/cx18-irq.c
@@ -0,0 +1,81 @@
+/*
+ * cx18 interrupt handling
+ *
+ * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
+ * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
+ *
+ * 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 "cx18-driver.h"
+#include "cx18-io.h"
+#include "cx18-irq.h"
+#include "cx18-mailbox.h"
+#include "cx18-scb.h"
+
+static void xpu_ack(struct cx18 *cx, u32 sw2)
+{
+ if (sw2 & IRQ_CPU_TO_EPU_ACK)
+ wake_up(&cx->mb_cpu_waitq);
+ if (sw2 & IRQ_APU_TO_EPU_ACK)
+ wake_up(&cx->mb_apu_waitq);
+}
+
+static void epu_cmd(struct cx18 *cx, u32 sw1)
+{
+ if (sw1 & IRQ_CPU_TO_EPU)
+ cx18_api_epu_cmd_irq(cx, CPU);
+ if (sw1 & IRQ_APU_TO_EPU)
+ cx18_api_epu_cmd_irq(cx, APU);
+}
+
+irqreturn_t cx18_irq_handler(int irq, void *dev_id)
+{
+ struct cx18 *cx = (struct cx18 *)dev_id;
+ u32 sw1, sw2, hw2;
+
+ sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & cx->sw1_irq_mask;
+ sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & cx->sw2_irq_mask;
+ hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & cx->hw2_irq_mask;
+
+ if (sw1)
+ cx18_write_reg_expect(cx, sw1, SW1_INT_STATUS, ~sw1, sw1);
+ if (sw2)
+ cx18_write_reg_expect(cx, sw2, SW2_INT_STATUS, ~sw2, sw2);
+ if (hw2)
+ cx18_write_reg_expect(cx, hw2, HW2_INT_CLR_STATUS, ~hw2, hw2);
+
+ if (sw1 || sw2 || hw2)
+ CX18_DEBUG_HI_IRQ("received interrupts "
+ "SW1: %x SW2: %x HW2: %x\n", sw1, sw2, hw2);
+
+ /*
+ * SW1 responses have to happen first. The sending XPU times out the
+ * incoming mailboxes on us rather rapidly.
+ */
+ if (sw1)
+ epu_cmd(cx, sw1);
+
+ /* To do: interrupt-based I2C handling
+ if (hw2 & (HW2_I2C1_INT|HW2_I2C2_INT)) {
+ }
+ */
+
+ if (sw2)
+ xpu_ack(cx, sw2);
+
+ return (sw1 || sw2 || hw2) ? IRQ_HANDLED : IRQ_NONE;
+}
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