V4L/DVB (9515): cx18: Use correct Mailbox IRQ Ack values and misc IRQ handling cleanup

cx18: Use correct Mailbox IRQ Ack values and misc IRQ handling cleanup.
The SCB field definitions for Ack IRQ's for mailboxes were inconsistent with
the bitmasks being loaded into those SCB fields and the SW2 Ack IRQ handling
logic.  Renamed fields in SCB to make things consistent and did misc IRQ
handling cleanups: removing legacy ivtv dma_reg_lock, HPU IRQ flags, etc.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-driver.c

@@ -448,7 +448,6 @@ static int __devinit cx18_init_struct1(struct cx18 *cx)
 	mutex_init(&cx->gpio_lock);
 
 	spin_lock_init(&cx->lock);
-	spin_lock_init(&cx->dma_reg_lock);
 
 	/* start counting open_id at 1 */
 	cx->open_id = 1;

drivers/media/video/cx18/cx18-driver.h

@@ -402,8 +402,6 @@ struct cx18 {
 	spinlock_t lock;        /* lock access to this struct */
 	int search_pack_header;
 
-	spinlock_t dma_reg_lock; /* lock access to DMA engine registers */
-
 	int open_id;		/* incremented each time an open occurs, used as
 				   unique ID. Starts at 1, so 0 can be used as
 				   uninitialized value in the stream->id. */

drivers/media/video/cx18/cx18-irq.c

@@ -30,8 +30,6 @@
 #include "cx18-vbi.h"
 #include "cx18-scb.h"
 
-#define DMA_MAGIC_COOKIE 0x000001fe
-
 static void epu_dma_done(struct cx18 *cx, struct cx18_mailbox *mb)
 {
 	u32 handle = mb->args[0];
@@ -109,7 +107,7 @@ static void epu_debug(struct cx18 *cx, struct cx18_mailbox *mb)
 		CX18_INFO("FW version: %s\n", p - 1);
 }
 
-static void hpu_cmd(struct cx18 *cx, u32 sw1)
+static void epu_cmd(struct cx18 *cx, u32 sw1)
 {
 	struct cx18_mailbox mb;
 
@@ -125,12 +123,31 @@ static void hpu_cmd(struct cx18 *cx, u32 sw1)
 			epu_debug(cx, &mb);
 			break;
 		default:
-			CX18_WARN("Unexpected mailbox command %08x\n", mb.cmd);
+			CX18_WARN("Unknown CPU_TO_EPU mailbox command %#08x\n",
+				  mb.cmd);
 			break;
 		}
 	}
-	if (sw1 & (IRQ_APU_TO_EPU | IRQ_HPU_TO_EPU))
-		CX18_WARN("Unexpected interrupt %08x\n", sw1);
+
+	if (sw1 & IRQ_APU_TO_EPU) {
+		cx18_memcpy_fromio(cx, &mb, &cx->scb->apu2epu_mb, sizeof(mb));
+		CX18_WARN("Unknown APU_TO_EPU mailbox command %#08x\n", mb.cmd);
+	}
+
+	if (sw1 & IRQ_HPU_TO_EPU) {
+		cx18_memcpy_fromio(cx, &mb, &cx->scb->hpu2epu_mb, sizeof(mb));
+		CX18_WARN("Unknown HPU_TO_EPU mailbox command %#08x\n", mb.cmd);
+	}
+}
+
+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);
+	if (sw2 & IRQ_HPU_TO_EPU_ACK)
+		wake_up(&cx->mb_hpu_waitq);
 }
 
 irqreturn_t cx18_irq_handler(int irq, void *dev_id)
@@ -140,11 +157,9 @@ irqreturn_t cx18_irq_handler(int irq, void *dev_id)
 	u32 sw2, sw2_mask;
 	u32 hw2, hw2_mask;
 
-	spin_lock(&cx->dma_reg_lock);
-
-	sw1_mask = cx18_read_reg(cx, SW1_INT_ENABLE_PCI) | IRQ_EPU_TO_HPU;
+	sw1_mask = cx18_read_reg(cx, SW1_INT_ENABLE_PCI);
 	sw1 = cx18_read_reg(cx, SW1_INT_STATUS) & sw1_mask;
-	sw2_mask = cx18_read_reg(cx, SW2_INT_ENABLE_PCI) | IRQ_EPU_TO_HPU_ACK;
+	sw2_mask = cx18_read_reg(cx, SW2_INT_ENABLE_PCI);
 	sw2 = cx18_read_reg(cx, SW2_INT_STATUS) & sw2_mask;
 	hw2_mask = cx18_read_reg(cx, HW2_INT_MASK5_PCI);
 	hw2 = cx18_read_reg(cx, HW2_INT_CLR_STATUS) & hw2_mask;
@@ -160,26 +175,15 @@ irqreturn_t cx18_irq_handler(int irq, void *dev_id)
 		CX18_DEBUG_HI_IRQ("SW1: %x  SW2: %x  HW2: %x\n", sw1, sw2, hw2);
 
 	/* To do: interrupt-based I2C handling
-	if (hw2 & 0x00c00000) {
+	if (hw2 & (HW2_I2C1_INT|HW2_I2C2_INT)) {
 	}
 	*/
 
-	if (sw2) {
-		if (sw2 & (cx18_readl(cx, &cx->scb->cpu2hpu_irq_ack) |
-			   cx18_readl(cx, &cx->scb->cpu2epu_irq_ack)))
-			wake_up(&cx->mb_cpu_waitq);
-		if (sw2 & (cx18_readl(cx, &cx->scb->apu2hpu_irq_ack) |
-			   cx18_readl(cx, &cx->scb->apu2epu_irq_ack)))
-			wake_up(&cx->mb_apu_waitq);
-		if (sw2 & cx18_readl(cx, &cx->scb->epu2hpu_irq_ack))
-			wake_up(&cx->mb_epu_waitq);
-		if (sw2 & cx18_readl(cx, &cx->scb->hpu2epu_irq_ack))
-			wake_up(&cx->mb_hpu_waitq);
-	}
+	if (sw2)
+		xpu_ack(cx, sw2);
 
 	if (sw1)
-		hpu_cmd(cx, sw1);
-	spin_unlock(&cx->dma_reg_lock);
+		epu_cmd(cx, sw1);
 
 	return (sw1 || sw2 || hw2) ? IRQ_HANDLED : IRQ_NONE;
 }

drivers/media/video/cx18/cx18-scb.h

@@ -128,22 +128,22 @@ struct cx18_scb {
 	u32 apu2cpu_irq;
 	/* Value to write to register SW2 register set (0xC7003140) after the
 	   command is cleared */
-	u32 apu2cpu_irq_ack;
+	u32 cpu2apu_irq_ack;
 	u32 reserved2[13];
 
 	u32 hpu2cpu_mb_offset;
 	u32 hpu2cpu_irq;
-	u32 hpu2cpu_irq_ack;
+	u32 cpu2hpu_irq_ack;
 	u32 reserved3[13];
 
 	u32 ppu2cpu_mb_offset;
 	u32 ppu2cpu_irq;
-	u32 ppu2cpu_irq_ack;
+	u32 cpu2ppu_irq_ack;
 	u32 reserved4[13];
 
 	u32 epu2cpu_mb_offset;
 	u32 epu2cpu_irq;
-	u32 epu2cpu_irq_ack;
+	u32 cpu2epu_irq_ack;
 	u32 reserved5[13];
 	u32 reserved6[8];
 
@@ -153,22 +153,22 @@ struct cx18_scb {
 	u32 reserved11[7];
 	u32 cpu2apu_mb_offset;
 	u32 cpu2apu_irq;
-	u32 cpu2apu_irq_ack;
+	u32 apu2cpu_irq_ack;
 	u32 reserved12[13];
 
 	u32 hpu2apu_mb_offset;
 	u32 hpu2apu_irq;
-	u32 hpu2apu_irq_ack;
+	u32 apu2hpu_irq_ack;
 	u32 reserved13[13];
 
 	u32 ppu2apu_mb_offset;
 	u32 ppu2apu_irq;
-	u32 ppu2apu_irq_ack;
+	u32 apu2ppu_irq_ack;
 	u32 reserved14[13];
 
 	u32 epu2apu_mb_offset;
 	u32 epu2apu_irq;
-	u32 epu2apu_irq_ack;
+	u32 apu2epu_irq_ack;
 	u32 reserved15[13];
 	u32 reserved16[8];
 
@@ -178,22 +178,22 @@ struct cx18_scb {
 	u32 reserved21[7];
 	u32 cpu2hpu_mb_offset;
 	u32 cpu2hpu_irq;
-	u32 cpu2hpu_irq_ack;
+	u32 hpu2cpu_irq_ack;
 	u32 reserved22[13];
 
 	u32 apu2hpu_mb_offset;
 	u32 apu2hpu_irq;
-	u32 apu2hpu_irq_ack;
+	u32 hpu2apu_irq_ack;
 	u32 reserved23[13];
 
 	u32 ppu2hpu_mb_offset;
 	u32 ppu2hpu_irq;
-	u32 ppu2hpu_irq_ack;
+	u32 hpu2ppu_irq_ack;
 	u32 reserved24[13];
 
 	u32 epu2hpu_mb_offset;
 	u32 epu2hpu_irq;
-	u32 epu2hpu_irq_ack;
+	u32 hpu2epu_irq_ack;
 	u32 reserved25[13];
 	u32 reserved26[8];
 
@@ -203,22 +203,22 @@ struct cx18_scb {
 	u32 reserved31[7];
 	u32 cpu2ppu_mb_offset;
 	u32 cpu2ppu_irq;
-	u32 cpu2ppu_irq_ack;
+	u32 ppu2cpu_irq_ack;
 	u32 reserved32[13];
 
 	u32 apu2ppu_mb_offset;
 	u32 apu2ppu_irq;
-	u32 apu2ppu_irq_ack;
+	u32 ppu2apu_irq_ack;
 	u32 reserved33[13];
 
 	u32 hpu2ppu_mb_offset;
 	u32 hpu2ppu_irq;
-	u32 hpu2ppu_irq_ack;
+	u32 ppu2hpu_irq_ack;
 	u32 reserved34[13];
 
 	u32 epu2ppu_mb_offset;
 	u32 epu2ppu_irq;
-	u32 epu2ppu_irq_ack;
+	u32 ppu2epu_irq_ack;
 	u32 reserved35[13];
 	u32 reserved36[8];
 
@@ -228,22 +228,22 @@ struct cx18_scb {
 	u32 reserved41[7];
 	u32 cpu2epu_mb_offset;
 	u32 cpu2epu_irq;
-	u32 cpu2epu_irq_ack;
+	u32 epu2cpu_irq_ack;
 	u32 reserved42[13];
 
 	u32 apu2epu_mb_offset;
 	u32 apu2epu_irq;
-	u32 apu2epu_irq_ack;
+	u32 epu2apu_irq_ack;
 	u32 reserved43[13];
 
 	u32 hpu2epu_mb_offset;
 	u32 hpu2epu_irq;
-	u32 hpu2epu_irq_ack;
+	u32 epu2hpu_irq_ack;
 	u32 reserved44[13];
 
 	u32 ppu2epu_mb_offset;
 	u32 ppu2epu_irq;
-	u32 ppu2epu_irq_ack;
+	u32 epu2ppu_irq_ack;
 	u32 reserved45[13];
 	u32 reserved46[8];