X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fmedia%2Fpci%2Fsaa7164%2Fsaa7164-cmd.c;fp=kernel%2Fdrivers%2Fmedia%2Fpci%2Fsaa7164%2Fsaa7164-cmd.c;h=cfabcbacc33dd26982c41d28ddebd9ebfaf103b7;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/media/pci/saa7164/saa7164-cmd.c b/kernel/drivers/media/pci/saa7164/saa7164-cmd.c
new file mode 100644
index 000000000..cfabcbacc
--- /dev/null
+++ b/kernel/drivers/media/pci/saa7164/saa7164-cmd.c
@@ -0,0 +1,589 @@
+/*
+ *  Driver for the NXP SAA7164 PCIe bridge
+ *
+ *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/wait.h>
+
+#include "saa7164.h"
+
+static int saa7164_cmd_alloc_seqno(struct saa7164_dev *dev)
+{
+	int i, ret = -1;
+
+	mutex_lock(&dev->lock);
+	for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
+		if (dev->cmds[i].inuse == 0) {
+			dev->cmds[i].inuse = 1;
+			dev->cmds[i].signalled = 0;
+			dev->cmds[i].timeout = 0;
+			ret = dev->cmds[i].seqno;
+			break;
+		}
+	}
+	mutex_unlock(&dev->lock);
+
+	return ret;
+}
+
+static void saa7164_cmd_free_seqno(struct saa7164_dev *dev, u8 seqno)
+{
+	mutex_lock(&dev->lock);
+	if ((dev->cmds[seqno].inuse == 1) &&
+		(dev->cmds[seqno].seqno == seqno)) {
+		dev->cmds[seqno].inuse = 0;
+		dev->cmds[seqno].signalled = 0;
+		dev->cmds[seqno].timeout = 0;
+	}
+	mutex_unlock(&dev->lock);
+}
+
+static void saa7164_cmd_timeout_seqno(struct saa7164_dev *dev, u8 seqno)
+{
+	mutex_lock(&dev->lock);
+	if ((dev->cmds[seqno].inuse == 1) &&
+		(dev->cmds[seqno].seqno == seqno)) {
+		dev->cmds[seqno].timeout = 1;
+	}
+	mutex_unlock(&dev->lock);
+}
+
+static u32 saa7164_cmd_timeout_get(struct saa7164_dev *dev, u8 seqno)
+{
+	int ret = 0;
+
+	mutex_lock(&dev->lock);
+	if ((dev->cmds[seqno].inuse == 1) &&
+		(dev->cmds[seqno].seqno == seqno)) {
+		ret = dev->cmds[seqno].timeout;
+	}
+	mutex_unlock(&dev->lock);
+
+	return ret;
+}
+
+/* Commands to the f/w get marshelled to/from this code then onto the PCI
+ * -bus/c running buffer. */
+int saa7164_irq_dequeue(struct saa7164_dev *dev)
+{
+	int ret = SAA_OK, i = 0;
+	u32 timeout;
+	wait_queue_head_t *q = NULL;
+	u8 tmp[512];
+	dprintk(DBGLVL_CMD, "%s()\n", __func__);
+
+	/* While any outstand message on the bus exists... */
+	do {
+
+		/* Peek the msg bus */
+		struct tmComResInfo tRsp = { 0, 0, 0, 0, 0, 0 };
+		ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
+		if (ret != SAA_OK)
+			break;
+
+		q = &dev->cmds[tRsp.seqno].wait;
+		timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
+		dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
+		if (!timeout) {
+			dprintk(DBGLVL_CMD,
+				"%s() signalled seqno(%d) (for dequeue)\n",
+				__func__, tRsp.seqno);
+			dev->cmds[tRsp.seqno].signalled = 1;
+			wake_up(q);
+		} else {
+			printk(KERN_ERR
+				"%s() found timed out command on the bus\n",
+					__func__);
+
+			/* Clean the bus */
+			ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
+			printk(KERN_ERR "%s() ret = %x\n", __func__, ret);
+			if (ret == SAA_ERR_EMPTY)
+				/* Someone else already fetched the response */
+				return SAA_OK;
+
+			if (ret != SAA_OK)
+				return ret;
+		}
+
+		/* It's unlikely to have more than 4 or 5 pending messages,
+		 * ensure we exit at some point regardless.
+		 */
+	} while (i++ < 32);
+
+	return ret;
+}
+
+/* Commands to the f/w get marshelled to/from this code then onto the PCI
+ * -bus/c running buffer. */
+static int saa7164_cmd_dequeue(struct saa7164_dev *dev)
+{
+	int loop = 1;
+	int ret;
+	u32 timeout;
+	wait_queue_head_t *q = NULL;
+	u8 tmp[512];
+	dprintk(DBGLVL_CMD, "%s()\n", __func__);
+
+	while (loop) {
+
+		struct tmComResInfo tRsp = { 0, 0, 0, 0, 0, 0 };
+		ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
+		if (ret == SAA_ERR_EMPTY)
+			return SAA_OK;
+
+		if (ret != SAA_OK)
+			return ret;
+
+		q = &dev->cmds[tRsp.seqno].wait;
+		timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
+		dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
+		if (timeout) {
+			printk(KERN_ERR "found timed out command on the bus\n");
+
+			/* Clean the bus */
+			ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
+			printk(KERN_ERR "ret = %x\n", ret);
+			if (ret == SAA_ERR_EMPTY)
+				/* Someone else already fetched the response */
+				return SAA_OK;
+
+			if (ret != SAA_OK)
+				return ret;
+
+			if (tRsp.flags & PVC_CMDFLAG_CONTINUE)
+				printk(KERN_ERR "split response\n");
+			else
+				saa7164_cmd_free_seqno(dev, tRsp.seqno);
+
+			printk(KERN_ERR " timeout continue\n");
+			continue;
+		}
+
+		dprintk(DBGLVL_CMD, "%s() signalled seqno(%d) (for dequeue)\n",
+			__func__, tRsp.seqno);
+		dev->cmds[tRsp.seqno].signalled = 1;
+		wake_up(q);
+		return SAA_OK;
+	}
+
+	return SAA_OK;
+}
+
+static int saa7164_cmd_set(struct saa7164_dev *dev, struct tmComResInfo *msg,
+			   void *buf)
+{
+	struct tmComResBusInfo *bus = &dev->bus;
+	u8 cmd_sent;
+	u16 size, idx;
+	u32 cmds;
+	void *tmp;
+	int ret = -1;
+
+	if (!msg) {
+		printk(KERN_ERR "%s() !msg\n", __func__);
+		return SAA_ERR_BAD_PARAMETER;
+	}
+
+	mutex_lock(&dev->cmds[msg->id].lock);
+
+	size = msg->size;
+	idx = 0;
+	cmds = size / bus->m_wMaxReqSize;
+	if (size % bus->m_wMaxReqSize == 0)
+		cmds -= 1;
+
+	cmd_sent = 0;
+
+	/* Split the request into smaller chunks */
+	for (idx = 0; idx < cmds; idx++) {
+
+		msg->flags |= SAA_CMDFLAG_CONTINUE;
+		msg->size = bus->m_wMaxReqSize;
+		tmp = buf + idx * bus->m_wMaxReqSize;
+
+		ret = saa7164_bus_set(dev, msg, tmp);
+		if (ret != SAA_OK) {
+			printk(KERN_ERR "%s() set failed %d\n", __func__, ret);
+
+			if (cmd_sent) {
+				ret = SAA_ERR_BUSY;
+				goto out;
+			}
+			ret = SAA_ERR_OVERFLOW;
+			goto out;
+		}
+		cmd_sent = 1;
+	}
+
+	/* If not the last command... */
+	if (idx != 0)
+		msg->flags &= ~SAA_CMDFLAG_CONTINUE;
+
+	msg->size = size - idx * bus->m_wMaxReqSize;
+
+	ret = saa7164_bus_set(dev, msg, buf + idx * bus->m_wMaxReqSize);
+	if (ret != SAA_OK) {
+		printk(KERN_ERR "%s() set last failed %d\n", __func__, ret);
+
+		if (cmd_sent) {
+			ret = SAA_ERR_BUSY;
+			goto out;
+		}
+		ret = SAA_ERR_OVERFLOW;
+		goto out;
+	}
+	ret = SAA_OK;
+
+out:
+	mutex_unlock(&dev->cmds[msg->id].lock);
+	return ret;
+}
+
+/* Wait for a signal event, without holding a mutex. Either return TIMEOUT if
+ * the event never occurred, or SAA_OK if it was signaled during the wait.
+ */
+static int saa7164_cmd_wait(struct saa7164_dev *dev, u8 seqno)
+{
+	wait_queue_head_t *q = NULL;
+	int ret = SAA_BUS_TIMEOUT;
+	unsigned long stamp;
+	int r;
+
+	if (saa_debug >= 4)
+		saa7164_bus_dump(dev);
+
+	dprintk(DBGLVL_CMD, "%s(seqno=%d)\n", __func__, seqno);
+
+	mutex_lock(&dev->lock);
+	if ((dev->cmds[seqno].inuse == 1) &&
+		(dev->cmds[seqno].seqno == seqno)) {
+		q = &dev->cmds[seqno].wait;
+	}
+	mutex_unlock(&dev->lock);
+
+	if (q) {
+		/* If we haven't been signalled we need to wait */
+		if (dev->cmds[seqno].signalled == 0) {
+			stamp = jiffies;
+			dprintk(DBGLVL_CMD,
+				"%s(seqno=%d) Waiting (signalled=%d)\n",
+				__func__, seqno, dev->cmds[seqno].signalled);
+
+			/* Wait for signalled to be flagged or timeout */
+			/* In a highly stressed system this can easily extend
+			 * into multiple seconds before the deferred worker
+			 * is scheduled, and we're woken up via signal.
+			 * We typically are signalled in < 50ms but it can
+			 * take MUCH longer.
+			 */
+			wait_event_timeout(*q, dev->cmds[seqno].signalled,
+				(HZ * waitsecs));
+			r = time_before(jiffies, stamp + (HZ * waitsecs));
+			if (r)
+				ret = SAA_OK;
+			else
+				saa7164_cmd_timeout_seqno(dev, seqno);
+
+			dprintk(DBGLVL_CMD, "%s(seqno=%d) Waiting res = %d "
+				"(signalled=%d)\n", __func__, seqno, r,
+				dev->cmds[seqno].signalled);
+		} else
+			ret = SAA_OK;
+	} else
+		printk(KERN_ERR "%s(seqno=%d) seqno is invalid\n",
+			__func__, seqno);
+
+	return ret;
+}
+
+void saa7164_cmd_signal(struct saa7164_dev *dev, u8 seqno)
+{
+	int i;
+	dprintk(DBGLVL_CMD, "%s()\n", __func__);
+
+	mutex_lock(&dev->lock);
+	for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
+		if (dev->cmds[i].inuse == 1) {
+			dprintk(DBGLVL_CMD,
+				"seqno %d inuse, sig = %d, t/out = %d\n",
+				dev->cmds[i].seqno,
+				dev->cmds[i].signalled,
+				dev->cmds[i].timeout);
+		}
+	}
+
+	for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
+		if ((dev->cmds[i].inuse == 1) && ((i == 0) ||
+			(dev->cmds[i].signalled) || (dev->cmds[i].timeout))) {
+			dprintk(DBGLVL_CMD, "%s(seqno=%d) calling wake_up\n",
+				__func__, i);
+			dev->cmds[i].signalled = 1;
+			wake_up(&dev->cmds[i].wait);
+		}
+	}
+	mutex_unlock(&dev->lock);
+}
+
+int saa7164_cmd_send(struct saa7164_dev *dev, u8 id, enum tmComResCmd command,
+	u16 controlselector, u16 size, void *buf)
+{
+	struct tmComResInfo command_t, *pcommand_t;
+	struct tmComResInfo response_t, *presponse_t;
+	u8 errdata[256];
+	u16 resp_dsize;
+	u16 data_recd;
+	u32 loop;
+	int ret;
+	int safety = 0;
+
+	dprintk(DBGLVL_CMD, "%s(unitid = %s (%d) , command = 0x%x, "
+		"sel = 0x%x)\n", __func__, saa7164_unitid_name(dev, id), id,
+		command, controlselector);
+
+	if ((size == 0) || (buf == NULL)) {
+		printk(KERN_ERR "%s() Invalid param\n", __func__);
+		return SAA_ERR_BAD_PARAMETER;
+	}
+
+	/* Prepare some basic command/response structures */
+	memset(&command_t, 0, sizeof(command_t));
+	memset(&response_t, 0, sizeof(response_t));
+	pcommand_t = &command_t;
+	presponse_t = &response_t;
+	command_t.id = id;
+	command_t.command = command;
+	command_t.controlselector = controlselector;
+	command_t.size = size;
+
+	/* Allocate a unique sequence number */
+	ret = saa7164_cmd_alloc_seqno(dev);
+	if (ret < 0) {
+		printk(KERN_ERR "%s() No free sequences\n", __func__);
+		ret = SAA_ERR_NO_RESOURCES;
+		goto out;
+	}
+
+	command_t.seqno = (u8)ret;
+
+	/* Send Command */
+	resp_dsize = size;
+	pcommand_t->size = size;
+
+	dprintk(DBGLVL_CMD, "%s() pcommand_t.seqno = %d\n",
+		__func__, pcommand_t->seqno);
+
+	dprintk(DBGLVL_CMD, "%s() pcommand_t.size = %d\n",
+		__func__, pcommand_t->size);
+
+	ret = saa7164_cmd_set(dev, pcommand_t, buf);
+	if (ret != SAA_OK) {
+		printk(KERN_ERR "%s() set command failed %d\n", __func__, ret);
+
+		if (ret != SAA_ERR_BUSY)
+			saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
+		else
+			/* Flag a timeout, because at least one
+			 * command was sent */
+			saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
+
+		goto out;
+	}
+
+	/* With split responses we have to collect the msgs piece by piece */
+	data_recd = 0;
+	loop = 1;
+	while (loop) {
+		dprintk(DBGLVL_CMD, "%s() loop\n", __func__);
+
+		ret = saa7164_cmd_wait(dev, pcommand_t->seqno);
+		dprintk(DBGLVL_CMD, "%s() loop ret = %d\n", __func__, ret);
+
+		/* if power is down and this is not a power command ... */
+
+		if (ret == SAA_BUS_TIMEOUT) {
+			printk(KERN_ERR "Event timed out\n");
+			saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
+			return ret;
+		}
+
+		if (ret != SAA_OK) {
+			printk(KERN_ERR "spurious error\n");
+			return ret;
+		}
+
+		/* Peek response */
+		ret = saa7164_bus_get(dev, presponse_t, NULL, 1);
+		if (ret == SAA_ERR_EMPTY) {
+			dprintk(4, "%s() SAA_ERR_EMPTY\n", __func__);
+			continue;
+		}
+		if (ret != SAA_OK) {
+			printk(KERN_ERR "peek failed\n");
+			return ret;
+		}
+
+		dprintk(DBGLVL_CMD, "%s() presponse_t->seqno = %d\n",
+			__func__, presponse_t->seqno);
+
+		dprintk(DBGLVL_CMD, "%s() presponse_t->flags = 0x%x\n",
+			__func__, presponse_t->flags);
+
+		dprintk(DBGLVL_CMD, "%s() presponse_t->size = %d\n",
+			__func__, presponse_t->size);
+
+		/* Check if the response was for our command */
+		if (presponse_t->seqno != pcommand_t->seqno) {
+
+			dprintk(DBGLVL_CMD,
+				"wrong event: seqno = %d, "
+				"expected seqno = %d, "
+				"will dequeue regardless\n",
+				presponse_t->seqno, pcommand_t->seqno);
+
+			ret = saa7164_cmd_dequeue(dev);
+			if (ret != SAA_OK) {
+				printk(KERN_ERR "dequeue failed, ret = %d\n",
+					ret);
+				if (safety++ > 16) {
+					printk(KERN_ERR
+					"dequeue exceeded, safety exit\n");
+					return SAA_ERR_BUSY;
+				}
+			}
+
+			continue;
+		}
+
+		if ((presponse_t->flags & PVC_RESPONSEFLAG_ERROR) != 0) {
+
+			memset(&errdata[0], 0, sizeof(errdata));
+
+			ret = saa7164_bus_get(dev, presponse_t, &errdata[0], 0);
+			if (ret != SAA_OK) {
+				printk(KERN_ERR "get error(2)\n");
+				return ret;
+			}
+
+			saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
+
+			dprintk(DBGLVL_CMD, "%s() errdata %02x%02x%02x%02x\n",
+				__func__, errdata[0], errdata[1], errdata[2],
+				errdata[3]);
+
+			/* Map error codes */
+			dprintk(DBGLVL_CMD, "%s() cmd, error code  = 0x%x\n",
+				__func__, errdata[0]);
+
+			switch (errdata[0]) {
+			case PVC_ERRORCODE_INVALID_COMMAND:
+				dprintk(DBGLVL_CMD, "%s() INVALID_COMMAND\n",
+					__func__);
+				ret = SAA_ERR_INVALID_COMMAND;
+				break;
+			case PVC_ERRORCODE_INVALID_DATA:
+				dprintk(DBGLVL_CMD, "%s() INVALID_DATA\n",
+					__func__);
+				ret = SAA_ERR_BAD_PARAMETER;
+				break;
+			case PVC_ERRORCODE_TIMEOUT:
+				dprintk(DBGLVL_CMD, "%s() TIMEOUT\n", __func__);
+				ret = SAA_ERR_TIMEOUT;
+				break;
+			case PVC_ERRORCODE_NAK:
+				dprintk(DBGLVL_CMD, "%s() NAK\n", __func__);
+				ret = SAA_ERR_NULL_PACKET;
+				break;
+			case PVC_ERRORCODE_UNKNOWN:
+			case PVC_ERRORCODE_INVALID_CONTROL:
+				dprintk(DBGLVL_CMD,
+					"%s() UNKNOWN OR INVALID CONTROL\n",
+					__func__);
+			default:
+				dprintk(DBGLVL_CMD, "%s() UNKNOWN\n", __func__);
+				ret = SAA_ERR_NOT_SUPPORTED;
+			}
+
+			/* See of other commands are on the bus */
+			if (saa7164_cmd_dequeue(dev) != SAA_OK)
+				printk(KERN_ERR "dequeue(2) failed\n");
+
+			return ret;
+		}
+
+		/* If response is invalid */
+		if ((presponse_t->id != pcommand_t->id) ||
+			(presponse_t->command != pcommand_t->command) ||
+			(presponse_t->controlselector !=
+				pcommand_t->controlselector) ||
+			(((resp_dsize - data_recd) != presponse_t->size) &&
+				!(presponse_t->flags & PVC_CMDFLAG_CONTINUE)) ||
+			((resp_dsize - data_recd) < presponse_t->size)) {
+
+			/* Invalid */
+			dprintk(DBGLVL_CMD, "%s() Invalid\n", __func__);
+			ret = saa7164_bus_get(dev, presponse_t, NULL, 0);
+			if (ret != SAA_OK) {
+				printk(KERN_ERR "get failed\n");
+				return ret;
+			}
+
+			/* See of other commands are on the bus */
+			if (saa7164_cmd_dequeue(dev) != SAA_OK)
+				printk(KERN_ERR "dequeue(3) failed\n");
+			continue;
+		}
+
+		/* OK, now we're actually getting out correct response */
+		ret = saa7164_bus_get(dev, presponse_t, buf + data_recd, 0);
+		if (ret != SAA_OK) {
+			printk(KERN_ERR "get failed\n");
+			return ret;
+		}
+
+		data_recd = presponse_t->size + data_recd;
+		if (resp_dsize == data_recd) {
+			dprintk(DBGLVL_CMD, "%s() Resp recd\n", __func__);
+			break;
+		}
+
+		/* See of other commands are on the bus */
+		if (saa7164_cmd_dequeue(dev) != SAA_OK)
+			printk(KERN_ERR "dequeue(3) failed\n");
+
+		continue;
+
+	} /* (loop) */
+
+	/* Release the sequence number allocation */
+	saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
+
+	/* if powerdown signal all pending commands */
+
+	dprintk(DBGLVL_CMD, "%s() Calling dequeue then exit\n", __func__);
+
+	/* See of other commands are on the bus */
+	if (saa7164_cmd_dequeue(dev) != SAA_OK)
+		printk(KERN_ERR "dequeue(4) failed\n");
+
+	ret = SAA_OK;
+out:
+	return ret;
+}
+