goldfish: 64-bit audio driver for goldfish platform

Enable the 64-bit goldfish audio driver.
Support 64-bit buffer address and data read/write.
Signed-off-by: Jun Tian <jun.j.tian@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/goldfish/goldfish_audio.c

@@ -78,11 +78,18 @@ enum {
 	/* set number of bytes in buffer to write */
 	AUDIO_WRITE_BUFFER_1  = 0x10,
 	AUDIO_WRITE_BUFFER_2  = 0x14,
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+	AUDIO_SET_WRITE_BUFFER_1_HIGH = 0x28,
+	AUDIO_SET_WRITE_BUFFER_2_HIGH = 0x30,
+#endif
 
 	/* true if audio input is supported */
 	AUDIO_READ_SUPPORTED = 0x18,
 	/* buffer to use for audio input */
 	AUDIO_SET_READ_BUFFER = 0x1C,
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+	AUDIO_SET_READ_BUFFER_HIGH = 0x34,
+#endif
 
 	/* driver writes number of bytes to read */
 	AUDIO_START_READ  = 0x20,
@@ -267,6 +274,9 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 	struct resource *r;
 	struct goldfish_audio *data;
 	dma_addr_t buf_addr;
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+	u32 buf_addr_high, buf_addr_low;
+#endif
 
 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (data == NULL) {
@@ -322,6 +332,28 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 		goto err_misc_register_failed;
 	}
 
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+	buf_addr_low = (u32)(buf_addr);
+	buf_addr_high = (u32)((buf_addr) >> 32);
+
+	AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_1, buf_addr_low);
+	AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_1_HIGH, buf_addr_high);
+
+	buf_addr_low = (u32)(buf_addr + WRITE_BUFFER_SIZE);
+	buf_addr_high = (u32)((buf_addr + WRITE_BUFFER_SIZE) >> 32);
+
+	AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_2, buf_addr_low);
+	AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_2_HIGH, buf_addr_high);
+
+	buf_addr_low = (u32)(buf_addr + 2 * WRITE_BUFFER_SIZE);
+	buf_addr_high = (u32)((buf_addr + 2 * WRITE_BUFFER_SIZE) >> 32);
+
+	data->read_supported = AUDIO_READ(data, AUDIO_READ_SUPPORTED);
+	if (data->read_supported){
+                AUDIO_WRITE(data, AUDIO_SET_READ_BUFFER, buf_addr_low);
+                AUDIO_WRITE(data, AUDIO_SET_READ_BUFFER_HIGH, buf_addr_high);
+	}
+#else
 	AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_1, buf_addr);
 	AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_2,
 						buf_addr + WRITE_BUFFER_SIZE);
@@ -330,6 +362,7 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 	if (data->read_supported)
 		AUDIO_WRITE(data, AUDIO_SET_READ_BUFFER,
 					buf_addr + 2 * WRITE_BUFFER_SIZE);
+#endif
 
 	audio_data = data;
 	return 0;