ALSA: asihpi: Add support for stream interrupt.

Some cards have a so-called low-latency mode, in which they present
a single multichannel stream with no mixing or samplerate conversion.
In this mode the card can generate an interrupt per internal processing
block (typically 32 or 64 frames)
Signed-off-by: Eliot Blennerhassett <eliot@blennerhassett.gen.nz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/asihpi/hpi6205.c

 /******************************************************************************
 
     AudioScience HPI driver
-    Copyright (C) 1997-2011  AudioScience Inc. <support@audioscience.com>
+    Copyright (C) 1997-2014  AudioScience Inc. <support@audioscience.com>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of version 2 of the GNU General Public License as
@@ -163,6 +163,9 @@ static u16 create_adapter_obj(struct hpi_adapter_obj *pao,
 
 static void delete_adapter_obj(struct hpi_adapter_obj *pao);
 
+static int adapter_irq_query_and_clear(struct hpi_adapter_obj *pao,
+	u32 message);
+
 static void outstream_host_buffer_allocate(struct hpi_adapter_obj *pao,
 	struct hpi_message *phm, struct hpi_response *phr);
 
@@ -283,7 +286,6 @@ static void adapter_message(struct hpi_adapter_obj *pao,
 	case HPI_ADAPTER_DELETE:
 		adapter_delete(pao, phm, phr);
 		break;
-
 	default:
 		hw_message(pao, phm, phr);
 		break;
@@ -673,6 +675,12 @@ static u16 create_adapter_obj(struct hpi_adapter_obj *pao,
 
 	HPI_DEBUG_LOG(INFO, "bootload DSP OK\n");
 
+	pao->irq_query_and_clear = adapter_irq_query_and_clear;
+	pao->instream_host_buffer_status =
+		phw->p_interface_buffer->instream_host_buffer_status;
+	pao->outstream_host_buffer_status =
+		phw->p_interface_buffer->outstream_host_buffer_status;
+
 	return hpi_add_adapter(pao);
 }
 
@@ -713,6 +721,21 @@ static void delete_adapter_obj(struct hpi_adapter_obj *pao)
 
 /*****************************************************************************/
 /* Adapter functions */
+static int adapter_irq_query_and_clear(struct hpi_adapter_obj *pao,
+	u32 message)
+{
+	struct hpi_hw_obj *phw = pao->priv;
+	u32 hsr = 0;
+
+	hsr = ioread32(phw->prHSR);
+	if (hsr & C6205_HSR_INTSRC) {
+		/* reset the interrupt from the DSP */
+		iowrite32(C6205_HSR_INTSRC, phw->prHSR);
+		return HPI_IRQ_MIXER;
+	}
+
+	return HPI_IRQ_NONE;
+}
 
 /*****************************************************************************/
 /* OutStream Host buffer functions */
@@ -1331,17 +1354,21 @@ static u16 adapter_boot_load_dsp(struct hpi_adapter_obj *pao,
 	if (boot_code_id[1] != 0) {
 		/* DSP 1 is a C6713 */
 		/* CLKX0 <- '1' release the C6205 bootmode pulldowns */
-		boot_loader_write_mem32(pao, 0, (0x018C0024L), 0x00002202);
+		boot_loader_write_mem32(pao, 0, 0x018C0024, 0x00002202);
 		hpios_delay_micro_seconds(100);
 		/* Reset the 6713 #1 - revB */
 		boot_loader_write_mem32(pao, 0, C6205_BAR0_TIMER1_CTL, 0);
-
-		/* dummy read every 4 words for 6205 advisory 1.4.4 */
-		boot_loader_read_mem32(pao, 0, 0);
-
+		/* value of bit 3 is unknown after DSP reset, other bits shoudl be 0 */
+		if (0 != (boot_loader_read_mem32(pao, 0,
+					(C6205_BAR0_TIMER1_CTL)) & ~8))
+			return HPI6205_ERROR_6205_REG;
 		hpios_delay_micro_seconds(100);
+
 		/* Release C6713 from reset - revB */
 		boot_loader_write_mem32(pao, 0, C6205_BAR0_TIMER1_CTL, 4);
+		if (4 != (boot_loader_read_mem32(pao, 0,
+					(C6205_BAR0_TIMER1_CTL)) & ~8))
+			return HPI6205_ERROR_6205_REG;
 		hpios_delay_micro_seconds(100);
 	}
 
@@ -2089,7 +2116,7 @@ static u16 message_response_sequence(struct hpi_adapter_obj *pao,
 		return 0;
 	}
 
-	/* Assume buffer of type struct bus_master_interface
+	/* Assume buffer of type struct bus_master_interface_62
 	   is allocated "noncacheable" */
 
 	if (!wait_dsp_ack(phw, H620_HIF_IDLE, HPI6205_TIMEOUT)) {

sound/pci/asihpi/hpi_internal.h

@@ -686,8 +686,8 @@ union hpi_adapterx_msg {
 		u16 value;
 	} test_assert;
 	struct {
-		u32 yes;
-	} irq_query;
+		u32 message;
+	} irq;
 	u32 pad[3];
 };
 

sound/pci/asihpi/hpicmn.h

 /**
 
     AudioScience HPI driver
-    Copyright (C) 1997-2011  AudioScience Inc. <support@audioscience.com>
+    Copyright (C) 1997-2014  AudioScience Inc. <support@audioscience.com>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of version 2 of the GNU General Public License as
@@ -21,7 +21,11 @@
 struct hpi_adapter_obj;
 
 /* a function that takes an adapter obj and returns an int */
-typedef int adapter_int_func(struct hpi_adapter_obj *pao);
+typedef int adapter_int_func(struct hpi_adapter_obj *pao, u32 message);
+
+#define HPI_IRQ_NONE		(0)
+#define HPI_IRQ_MESSAGE		(1)
+#define HPI_IRQ_MIXER		(2)
 
 struct hpi_adapter_obj {
 	struct hpi_pci pci;	/* PCI info - bus#,dev#,address etc */
@@ -33,6 +37,9 @@ struct hpi_adapter_obj {
 	u16 dsp_crashed;
 	u16 has_control_cache;
 	void *priv;
+	adapter_int_func *irq_query_and_clear;
+	struct hpi_hostbuffer_status *instream_host_buffer_status;
+	struct hpi_hostbuffer_status *outstream_host_buffer_status;
 };
 
 struct hpi_control_cache {
@@ -55,13 +62,21 @@ void hpi_delete_adapter(struct hpi_adapter_obj *pao);
 
 short hpi_check_control_cache(struct hpi_control_cache *pC,
 	struct hpi_message *phm, struct hpi_response *phr);
+
+short hpi_check_control_cache_single(struct hpi_control_cache_single *pC,
+	struct hpi_message *phm, struct hpi_response *phr);
+
 struct hpi_control_cache *hpi_alloc_control_cache(const u32
 	number_of_controls, const u32 size_in_bytes, u8 *pDSP_control_buffer);
+
 void hpi_free_control_cache(struct hpi_control_cache *p_cache);
 
 void hpi_cmn_control_cache_sync_to_msg(struct hpi_control_cache *pC,
 	struct hpi_message *phm, struct hpi_response *phr);
 
+void hpi_cmn_control_cache_sync_to_msg_single(struct hpi_control_cache_single
+	*pC, struct hpi_message *phm, struct hpi_response *phr);
+
 u16 hpi_validate_response(struct hpi_message *phm, struct hpi_response *phr);
 
 hpi_handler_func HPI_COMMON;

sound/pci/asihpi/hpioctl.c

 /*******************************************************************************
-
     AudioScience HPI driver
-    Copyright (C) 1997-2011  AudioScience Inc. <support@audioscience.com>
+    Common Linux HPI ioctl and module probe/remove functions
+
+    Copyright (C) 1997-2014  AudioScience Inc. <support@audioscience.com>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of version 2 of the GNU General Public License as
@@ -12,11 +13,6 @@
     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
-
-Common Linux HPI ioctl and module probe/remove functions
 *******************************************************************************/
 #define SOURCEFILE_NAME "hpioctl.c"
 
@@ -29,6 +25,7 @@ Common Linux HPI ioctl and module probe/remove functions
 #include "hpicmn.h"
 
 #include <linux/fs.h>
+#include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/moduleparam.h>
 #include <asm/uaccess.h>
@@ -307,10 +304,38 @@ long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	return err;
 }
 
+static int asihpi_irq_count;
+
+static irqreturn_t asihpi_isr(int irq, void *dev_id)
+{
+	struct hpi_adapter *a = dev_id;
+	int handled;
+
+	if (!a->adapter->irq_query_and_clear) {
+		pr_err("asihpi_isr ASI%04X:%d no handler\n", a->adapter->type,
+			a->adapter->index);
+		return IRQ_NONE;
+	}
+
+	handled = a->adapter->irq_query_and_clear(a->adapter, 0);
+
+	if (!handled)
+		return IRQ_NONE;
+
+	asihpi_irq_count++;
+	/* printk(KERN_INFO "asihpi_isr %d ASI%04X:%d irq handled\n",
+	   asihpi_irq_count, a->adapter->type, a->adapter->index); */
+
+	if (a->interrupt_callback)
+		a->interrupt_callback(a);
+
+	return IRQ_HANDLED;
+}
+
 int asihpi_adapter_probe(struct pci_dev *pci_dev,
 			 const struct pci_device_id *pci_id)
 {
-	int idx, nm;
+	int idx, nm, low_latency_mode = 0, irq_supported = 0;
 	int adapter_index;
 	unsigned int memlen;
 	struct hpi_message hm;
@@ -388,8 +413,39 @@ int asihpi_adapter_probe(struct pci_dev *pci_dev,
 	hm.adapter_index = adapter.adapter->index;
 	hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 
-	if (hr.error)
+	if (hr.error) {
+		HPI_DEBUG_LOG(ERROR, "HPI_ADAPTER_OPEN failed, aborting\n");
+		goto err;
+	}
+
+	/* Check if current mode == Low Latency mode */
+	hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
+		HPI_ADAPTER_GET_MODE);
+	hm.adapter_index = adapter.adapter->index;
+	hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
+
+	if (hr.error) {
+		HPI_DEBUG_LOG(ERROR,
+			"HPI_ADAPTER_GET_MODE failed, aborting\n");
 		goto err;
+	}
+
+	if (hr.u.ax.mode.adapter_mode == HPI_ADAPTER_MODE_LOW_LATENCY)
+		low_latency_mode = 1;
+
+	/* Check if IRQs are supported */
+	hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
+		HPI_ADAPTER_GET_PROPERTY);
+	hm.adapter_index = adapter.adapter->index;
+	hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_SUPPORTS_IRQ;
+	hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
+	if (hr.error || !hr.u.ax.property_get.parameter1) {
+		dev_info(&pci_dev->dev,
+			"IRQs not supported by adapter at index %d\n",
+			adapter.adapter->index);
+	} else {
+		irq_supported = 1;
+	}
 
 	/* WARNING can't init mutex in 'adapter'
 	 * and then copy it to adapters[] ?!?!
@@ -398,6 +454,44 @@ int asihpi_adapter_probe(struct pci_dev *pci_dev,
 	mutex_init(&adapters[adapter_index].mutex);
 	pci_set_drvdata(pci_dev, &adapters[adapter_index]);
 
+	if (low_latency_mode && irq_supported) {
+		if (!adapter.adapter->irq_query_and_clear) {
+			dev_err(&pci_dev->dev,
+				"no IRQ handler for adapter %d, aborting\n",
+				adapter.adapter->index);
+			goto err;
+		}
+
+		/* Disable IRQ generation on DSP side by setting the rate to 0 */
+		hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
+			HPI_ADAPTER_SET_PROPERTY);
+		hm.adapter_index = adapter.adapter->index;
+		hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_IRQ_RATE;
+		hm.u.ax.property_set.parameter1 = 0;
+		hm.u.ax.property_set.parameter2 = 0;
+		hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
+		if (hr.error) {
+			HPI_DEBUG_LOG(ERROR,
+				"HPI_ADAPTER_GET_MODE failed, aborting\n");
+			goto err;
+		}
+
+		/* Note: request_irq calls asihpi_isr here */
+		if (request_irq(pci_dev->irq, asihpi_isr, IRQF_SHARED,
+				"asihpi", &adapters[adapter_index])) {
+			dev_err(&pci_dev->dev, "request_irq(%d) failed\n",
+				pci_dev->irq);
+			goto err;
+		}
+
+		adapters[adapter_index].interrupt_mode = 1;
+
+		dev_info(&pci_dev->dev, "using irq %d\n", pci_dev->irq);
+		adapters[adapter_index].irq = pci_dev->irq;
+	} else {
+		dev_info(&pci_dev->dev, "using polled mode\n");
+	}
+
 	dev_info(&pci_dev->dev, "probe succeeded for ASI%04X HPI index %d\n",
 		 adapter.adapter->type, adapter_index);
 
@@ -431,6 +525,15 @@ void asihpi_adapter_remove(struct pci_dev *pci_dev)
 	pa = pci_get_drvdata(pci_dev);
 	pci = pa->adapter->pci;
 
+	/* Disable IRQ generation on DSP side */
+	hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
+		HPI_ADAPTER_SET_PROPERTY);
+	hm.adapter_index = pa->adapter->index;
+	hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_IRQ_RATE;
+	hm.u.ax.property_set.parameter1 = 0;
+	hm.u.ax.property_set.parameter2 = 0;
+	hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
+
 	hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 		HPI_ADAPTER_DELETE);
 	hm.adapter_index = pa->adapter->index;
@@ -442,6 +545,9 @@ void asihpi_adapter_remove(struct pci_dev *pci_dev)
 			iounmap(pci.ap_mem_base[idx]);
 	}
 
+	if (pa->irq)
+		free_irq(pa->irq, pa);
+
 	if (pa->p_buffer)
 		vfree(pa->p_buffer);
 

sound/pci/asihpi/hpios.h

@@ -151,6 +151,10 @@ struct hpi_adapter {
 	struct hpi_adapter_obj *adapter;
 	struct snd_card *snd_card;
 
+	int irq;
+	int interrupt_mode;
+	void (*interrupt_callback) (struct hpi_adapter *);
+
 	/* mutex prevents contention for one card
 	   between multiple user programs (via ioctl) */
 	struct mutex mutex;