ALSA: ctxfi - Native timer support for emu20k2

Added the native timer support for emu20k2, which gives much more
accurate update timing than the system timer.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ctxfi/ct20k2reg.h

@@ -11,9 +11,12 @@
 
 
 /* Timer Registers */
-#define TIMER_TIMR          0x1B7004
-#define INTERRUPT_GIP       0x1B7010
-#define INTERRUPT_GIE       0x1B7014
+#define WC		0x1b7000
+#define TIMR		0x1b7004
+# define	TIMR_IE		(1<<15)
+# define	TIMR_IP		(1<<14)
+#define GIP		0x1b7010
+#define GIE		0x1b7014
 
 /* I2C Registers */
 #define I2C_IF_ADDRESS   0x1B9000

sound/pci/ctxfi/cthw20k2.c

@@ -1112,6 +1112,26 @@ static int daio_mgr_put_ctrl_blk(void *blk)
 	return 0;
 }
 
+/* Timer interrupt */
+static int set_timer_irq(struct hw *hw, int enable)
+{
+	hw_write_20kx(hw, GIE, enable ? IT_INT : 0);
+	return 0;
+}
+
+static int set_timer_tick(struct hw *hw, unsigned int ticks)
+{
+	if (ticks)
+		ticks |= TIMR_IE | TIMR_IP;
+	hw_write_20kx(hw, TIMR, ticks);
+	return 0;
+}
+
+static unsigned int get_wc(struct hw *hw)
+{
+	return hw_read_20kx(hw, WC);
+}
+
 /* Card hardware initialization block */
 struct dac_conf {
 	unsigned int msr; /* master sample rate in rsrs */
@@ -1841,6 +1861,22 @@ static int hw_have_digit_io_switch(struct hw *hw)
 	return 0;
 }
 
+static irqreturn_t ct_20k2_interrupt(int irq, void *dev_id)
+{
+	struct hw *hw = dev_id;
+	unsigned int status;
+
+	status = hw_read_20kx(hw, GIP);
+	if (!status)
+		return IRQ_NONE;
+
+	if (hw->irq_callback)
+		hw->irq_callback(hw->irq_callback_data, status);
+
+	hw_write_20kx(hw, GIP, status);
+	return IRQ_HANDLED;
+}
+
 static int hw_card_start(struct hw *hw)
 {
 	int err = 0;
@@ -1879,12 +1915,15 @@ static int hw_card_start(struct hw *hw)
 	set_field(&gctl, GCTL_UAA, 0);
 	hw_write_20kx(hw, GLOBAL_CNTL_GCTL, gctl);
 
-	/*if ((err = request_irq(pci->irq, ct_atc_interrupt, IRQF_SHARED,
-				atc->chip_details->nm_card, hw))) {
-		goto error3;
+	if (hw->irq < 0) {
+		err = request_irq(pci->irq, ct_20k2_interrupt, IRQF_SHARED,
+				  "ctxfi", hw);
+		if (err < 0) {
+			printk(KERN_ERR "XFi: Cannot get irq %d\n", pci->irq);
+			goto error2;
+		}
+		hw->irq = pci->irq;
 	}
-	hw->irq = pci->irq;
-	*/
 
 	pci_set_master(pci);
 
@@ -1972,7 +2011,7 @@ static int hw_card_init(struct hw *hw, struct card_conf *info)
 	hw_write_20kx(hw, GLOBAL_CNTL_GCTL, gctl);
 
 	/* Reset all global pending interrupts */
-	hw_write_20kx(hw, INTERRUPT_GIE, 0);
+	hw_write_20kx(hw, GIE, 0);
 	/* Reset all SRC pending interrupts */
 	hw_write_20kx(hw, SRC_IP, 0);
 
@@ -2149,6 +2188,10 @@ static struct hw ct20k2_preset __devinitdata = {
 	.daio_mgr_set_imapnxt = daio_mgr_set_imapnxt,
 	.daio_mgr_set_imapaddr = daio_mgr_set_imapaddr,
 	.daio_mgr_commit_write = daio_mgr_commit_write,
+
+	.set_timer_irq = set_timer_irq,
+	.set_timer_tick = set_timer_tick,
+	.get_wc = get_wc,
 };
 
 int __devinit create_20k2_hw_obj(struct hw **rhw)