1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/media/platform/qcom/iris/iris_hfi_queue.c b/drivers/media/platform/qcom/iris/iris_hfi_queue.c
new file mode 100644
index 000000000000..fac7df0c4d1a
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/iris_hfi_queue.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/pm_runtime.h>
+
+#include "iris_core.h"
+#include "iris_hfi_queue.h"
+#include "iris_vpu_common.h"
+
+static int iris_hfi_queue_write(struct iris_iface_q_info *qinfo, void *packet, u32 packet_size)
+{
+	struct iris_hfi_queue_header *queue = qinfo->qhdr;
+	u32 write_idx = queue->write_idx * sizeof(u32);
+	u32 read_idx = queue->read_idx * sizeof(u32);
+	u32 empty_space, new_write_idx, residue;
+	u32 *write_ptr;
+
+	if (write_idx < read_idx)
+		empty_space = read_idx - write_idx;
+	else
+		empty_space = IFACEQ_QUEUE_SIZE - (write_idx -  read_idx);
+	if (empty_space < packet_size)
+		return -ENOSPC;
+
+	queue->tx_req =  0;
+
+	new_write_idx = write_idx + packet_size;
+	write_ptr = (u32 *)((u8 *)qinfo->kernel_vaddr + write_idx);
+
+	if (write_ptr < (u32 *)qinfo->kernel_vaddr ||
+	    write_ptr > (u32 *)(qinfo->kernel_vaddr +
+	    IFACEQ_QUEUE_SIZE))
+		return -EINVAL;
+
+	if (new_write_idx < IFACEQ_QUEUE_SIZE) {
+		memcpy(write_ptr, packet, packet_size);
+	} else {
+		residue = new_write_idx - IFACEQ_QUEUE_SIZE;
+		memcpy(write_ptr, packet, (packet_size - residue));
+		memcpy(qinfo->kernel_vaddr,
+		       packet + (packet_size - residue), residue);
+		new_write_idx = residue;
+	}
+
+	/* Make sure packet is written before updating the write index */
+	mb();
+	queue->write_idx = new_write_idx / sizeof(u32);
+
+	/* Make sure write index is updated before an interrupt is raised */
+	mb();
+
+	return 0;
+}
+
+static int iris_hfi_queue_read(struct iris_iface_q_info *qinfo, void *packet)
+{
+	struct iris_hfi_queue_header *queue = qinfo->qhdr;
+	u32 write_idx = queue->write_idx * sizeof(u32);
+	u32 read_idx = queue->read_idx * sizeof(u32);
+	u32 packet_size, receive_request = 0;
+	u32 new_read_idx, residue;
+	u32 *read_ptr;
+	int ret = 0;
+
+	if (queue->queue_type == IFACEQ_MSGQ_ID)
+		receive_request = 1;
+
+	if (read_idx == write_idx) {
+		queue->rx_req = receive_request;
+		/* Ensure qhdr is updated in main memory */
+		mb();
+		return -ENODATA;
+	}
+
+	read_ptr = qinfo->kernel_vaddr + read_idx;
+	if (read_ptr < (u32 *)qinfo->kernel_vaddr ||
+	    read_ptr > (u32 *)(qinfo->kernel_vaddr +
+	    IFACEQ_QUEUE_SIZE - sizeof(*read_ptr)))
+		return -ENODATA;
+
+	packet_size = *read_ptr;
+	if (!packet_size)
+		return -EINVAL;
+
+	new_read_idx = read_idx + packet_size;
+	if (packet_size <= IFACEQ_CORE_PKT_SIZE) {
+		if (new_read_idx < IFACEQ_QUEUE_SIZE) {
+			memcpy(packet, read_ptr, packet_size);
+		} else {
+			residue = new_read_idx - IFACEQ_QUEUE_SIZE;
+			memcpy(packet, read_ptr, (packet_size - residue));
+			memcpy((packet + (packet_size - residue)),
+			       qinfo->kernel_vaddr, residue);
+			new_read_idx = residue;
+		}
+	} else {
+		new_read_idx = write_idx;
+		ret = -EBADMSG;
+	}
+
+	queue->rx_req = receive_request;
+
+	queue->read_idx = new_read_idx / sizeof(u32);
+	/* Ensure qhdr is updated in main memory */
+	mb();
+
+	return ret;
+}
+
+int iris_hfi_queue_cmd_write_locked(struct iris_core *core, void *pkt, u32 pkt_size)
+{
+	struct iris_iface_q_info *q_info = &core->command_queue;
+
+	if (core->state == IRIS_CORE_ERROR)
+		return -EINVAL;
+
+	if (!iris_hfi_queue_write(q_info, pkt, pkt_size)) {
+		iris_vpu_raise_interrupt(core);
+	} else {
+		dev_err(core->dev, "queue full\n");
+		return -ENODATA;
+	}
+
+	return 0;
+}
+
+int iris_hfi_queue_cmd_write(struct iris_core *core, void *pkt, u32 pkt_size)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(core->dev);
+	if (ret < 0)
+		goto exit;
+
+	mutex_lock(&core->lock);
+	ret = iris_hfi_queue_cmd_write_locked(core, pkt, pkt_size);
+	if (ret) {
+		mutex_unlock(&core->lock);
+		goto exit;
+	}
+	mutex_unlock(&core->lock);
+
+	pm_runtime_mark_last_busy(core->dev);
+	pm_runtime_put_autosuspend(core->dev);
+
+	return 0;
+
+exit:
+	pm_runtime_put_sync(core->dev);
+
+	return ret;
+}
+
+int iris_hfi_queue_msg_read(struct iris_core *core, void *pkt)
+{
+	struct iris_iface_q_info *q_info = &core->message_queue;
+	int ret = 0;
+
+	mutex_lock(&core->lock);
+	if (core->state != IRIS_CORE_INIT) {
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	if (iris_hfi_queue_read(q_info, pkt)) {
+		ret = -ENODATA;
+		goto unlock;
+	}
+
+unlock:
+	mutex_unlock(&core->lock);
+
+	return ret;
+}
+
+int iris_hfi_queue_dbg_read(struct iris_core *core, void *pkt)
+{
+	struct iris_iface_q_info *q_info = &core->debug_queue;
+	int ret = 0;
+
+	mutex_lock(&core->lock);
+	if (core->state != IRIS_CORE_INIT) {
+		ret = -EINVAL;
+		goto unlock;
+	}
+
+	if (iris_hfi_queue_read(q_info, pkt)) {
+		ret = -ENODATA;
+		goto unlock;
+	}
+
+unlock:
+	mutex_unlock(&core->lock);
+
+	return ret;
+}
+
+static void iris_hfi_queue_set_header(struct iris_core *core, u32 queue_id,
+				      struct iris_iface_q_info *iface_q)
+{
+	iface_q->qhdr->status = 0x1;
+	iface_q->qhdr->start_addr = iface_q->device_addr;
+	iface_q->qhdr->header_type = IFACEQ_DFLT_QHDR;
+	iface_q->qhdr->queue_type = queue_id;
+	iface_q->qhdr->q_size = IFACEQ_QUEUE_SIZE / sizeof(u32);
+	iface_q->qhdr->pkt_size = 0; /* variable packet size */
+	iface_q->qhdr->rx_wm = 0x1;
+	iface_q->qhdr->tx_wm = 0x1;
+	iface_q->qhdr->rx_req = 0x1;
+	iface_q->qhdr->tx_req = 0x0;
+	iface_q->qhdr->rx_irq_status = 0x0;
+	iface_q->qhdr->tx_irq_status = 0x0;
+	iface_q->qhdr->read_idx = 0x0;
+	iface_q->qhdr->write_idx = 0x0;
+
+	/*
+	 * Set receive request to zero on debug queue as there is no
+	 * need of interrupt from video hardware for debug messages
+	 */
+	if (queue_id == IFACEQ_DBGQ_ID)
+		iface_q->qhdr->rx_req = 0;
+}
+
+static void
+iris_hfi_queue_init(struct iris_core *core, u32 queue_id, struct iris_iface_q_info *iface_q)
+{
+	struct iris_hfi_queue_table_header *q_tbl_hdr = core->iface_q_table_vaddr;
+	u32 offset = sizeof(*q_tbl_hdr) + (queue_id * IFACEQ_QUEUE_SIZE);
+
+	iface_q->device_addr = core->iface_q_table_daddr + offset;
+	iface_q->kernel_vaddr =
+			(void *)((char *)core->iface_q_table_vaddr + offset);
+	iface_q->qhdr = &q_tbl_hdr->q_hdr[queue_id];
+
+	iris_hfi_queue_set_header(core, queue_id, iface_q);
+}
+
+static void iris_hfi_queue_deinit(struct iris_iface_q_info *iface_q)
+{
+	iface_q->qhdr = NULL;
+	iface_q->kernel_vaddr = NULL;
+	iface_q->device_addr = 0;
+}
+
+int iris_hfi_queues_init(struct iris_core *core)
+{
+	struct iris_hfi_queue_table_header *q_tbl_hdr;
+	u32 queue_size;
+
+	/* Iris hardware requires 4K queue alignment */
+	queue_size = ALIGN((sizeof(*q_tbl_hdr) + (IFACEQ_QUEUE_SIZE * IFACEQ_NUMQ)), SZ_4K);
+	core->iface_q_table_vaddr = dma_alloc_attrs(core->dev, queue_size,
+						    &core->iface_q_table_daddr,
+						    GFP_KERNEL, DMA_ATTR_WRITE_COMBINE);
+	if (!core->iface_q_table_vaddr) {
+		dev_err(core->dev, "queues alloc and map failed\n");
+		return -ENOMEM;
+	}
+
+	core->sfr_vaddr = dma_alloc_attrs(core->dev, SFR_SIZE,
+					  &core->sfr_daddr,
+					  GFP_KERNEL, DMA_ATTR_WRITE_COMBINE);
+	if (!core->sfr_vaddr) {
+		dev_err(core->dev, "sfr alloc and map failed\n");
+		dma_free_attrs(core->dev, sizeof(*q_tbl_hdr), core->iface_q_table_vaddr,
+			       core->iface_q_table_daddr, DMA_ATTR_WRITE_COMBINE);
+		return -ENOMEM;
+	}
+
+	iris_hfi_queue_init(core, IFACEQ_CMDQ_ID, &core->command_queue);
+	iris_hfi_queue_init(core, IFACEQ_MSGQ_ID, &core->message_queue);
+	iris_hfi_queue_init(core, IFACEQ_DBGQ_ID, &core->debug_queue);
+
+	q_tbl_hdr = (struct iris_hfi_queue_table_header *)core->iface_q_table_vaddr;
+	q_tbl_hdr->version = 0;
+	q_tbl_hdr->device_addr = (void *)core;
+	strscpy(q_tbl_hdr->name, "iris-hfi-queues", sizeof(q_tbl_hdr->name));
+	q_tbl_hdr->size = sizeof(*q_tbl_hdr);
+	q_tbl_hdr->qhdr0_offset = sizeof(*q_tbl_hdr) -
+		(IFACEQ_NUMQ * sizeof(struct iris_hfi_queue_header));
+	q_tbl_hdr->qhdr_size = sizeof(q_tbl_hdr->q_hdr[0]);
+	q_tbl_hdr->num_q = IFACEQ_NUMQ;
+	q_tbl_hdr->num_active_q = IFACEQ_NUMQ;
+
+	 /* Write sfr size in first word to be used by firmware */
+	*((u32 *)core->sfr_vaddr) = SFR_SIZE;
+
+	return 0;
+}
+
+void iris_hfi_queues_deinit(struct iris_core *core)
+{
+	u32 queue_size;
+
+	if (!core->iface_q_table_vaddr)
+		return;
+
+	iris_hfi_queue_deinit(&core->debug_queue);
+	iris_hfi_queue_deinit(&core->message_queue);
+	iris_hfi_queue_deinit(&core->command_queue);
+
+	dma_free_attrs(core->dev, SFR_SIZE, core->sfr_vaddr,
+		       core->sfr_daddr, DMA_ATTR_WRITE_COMBINE);
+
+	core->sfr_vaddr = NULL;
+	core->sfr_daddr = 0;
+
+	queue_size = ALIGN(sizeof(struct iris_hfi_queue_table_header) +
+		(IFACEQ_QUEUE_SIZE * IFACEQ_NUMQ), SZ_4K);
+
+	dma_free_attrs(core->dev, queue_size, core->iface_q_table_vaddr,
+		       core->iface_q_table_daddr, DMA_ATTR_WRITE_COMBINE);
+
+	core->iface_q_table_vaddr = NULL;
+	core->iface_q_table_daddr = 0;
+}