ALSA: ctxfi - Use native timer interrupt on emu20k1

emu20k1 has a native timer interrupt based on the audio clock, which
is more accurate than the system timer (from the synchronization POV).
This patch adds the code to handle this with multiple streams.

The system timer is still used on emu20k2, and can be used also for
emu20k1 easily by changing USE_SYSTEM_TIMER to 1 in cttimer.c.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 19 insertions, 0 deletions

diff --git a/sound/pci/ctxfi/cthardware.h b/sound/pci/ctxfi/cthardware.h
index b0512df8b334..35350cf9d2f2 100644
--- a/sound/pci/ctxfi/cthardware.h
+++ b/sound/pci/ctxfi/cthardware.h
@@ -145,6 +145,12 @@ struct hw {
         int (*daio_mgr_set_imapaddr)(void *blk, unsigned int addr);
         int (*daio_mgr_commit_write)(struct hw *hw, void *blk);
 
+        int (*set_timer_irq)(struct hw *hw, int enable);
+        int (*set_timer_tick)(struct hw *hw, unsigned int tick);
+
+        void (*irq_callback)(void *data, unsigned int bit);
+        void *irq_callback_data;
+
         struct pci_dev *pci;    /* the pci kernel structure of this card */
         int irq;
         unsigned long io_base;
@@ -157,4 +163,17 @@ int destroy_hw_obj(struct hw *hw);
 unsigned int get_field(unsigned int data, unsigned int field);
 void set_field(unsigned int *data, unsigned int field, unsigned int value);
 
+/* IRQ bits */
+#define PLL_INT         (1 << 10) /* PLL input-clock out-of-range */
+#define FI_INT          (1 << 9)  /* forced interrupt */
+#define IT_INT          (1 << 8)  /* timer interrupt */
+#define PCI_INT         (1 << 7)  /* PCI bus error pending */
+#define URT_INT         (1 << 6)  /* UART Tx/Rx */
+#define GPI_INT         (1 << 5)  /* GPI pin */
+#define MIX_INT         (1 << 4)  /* mixer parameter segment FIFO channels */
+#define DAI_INT         (1 << 3)  /* DAI (SR-tracker or SPDIF-receiver) */
+#define TP_INT          (1 << 2)  /* transport priority queue */
+#define DSP_INT         (1 << 1)  /* DSP */
+#define SRC_INT         (1 << 0)  /* SRC channels */
+
 #endif /* CTHARDWARE_H */