[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / saa7164 / saa7164-cmd.c

/*
 *  Driver for the NXP SAA7164 PCIe bridge
 *
 *  Copyright (c) 2009 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"

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;
}

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);
}

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);
}

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_cmd_dequeue(struct saa7164_dev *dev)
{
	int loop = 1;
	int ret;
	u32 timeout;
	wait_queue_head_t *q = 0;
	u8 tmp[512];
	dprintk(DBGLVL_CMD, "%s()\n", __func__);

	while (loop) {

		tmComResInfo_t 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;
}

int saa7164_cmd_set(struct saa7164_dev *dev, tmComResInfo_t* msg, void *buf)
{
	tmComResBusInfo_t *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 occured, or SAA_OK if it was signaled during the wait.
 */
int saa7164_cmd_wait(struct saa7164_dev *dev, u8 seqno)
{
	wait_queue_head_t *q = 0;
	int ret = SAA_BUS_TIMEOUT;
	unsigned long stamp;
	int r;

	if (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, tmComResCmd_t command,
	u16 controlselector, u16 size, void *buf)
{
	tmComResInfo_t command_t, *pcommand_t;
	tmComResInfo_t 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 == 0)) {
		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, 0, 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;
}
Commit	Line	Data
443c1228 ST	1	/*
	2	* Driver for the NXP SAA7164 PCIe bridge
	3	*
	4	* Copyright (c) 2009 Steven Toth <stoth@kernellabs.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	*
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <linux/wait.h>
	23
	24	#include "saa7164.h"
	25
	26	int saa7164_cmd_alloc_seqno(struct saa7164_dev *dev)
	27	{
	28	int i, ret = -1;
	29
	30	mutex_lock(&dev->lock);
	31	for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
	32	if (dev->cmds[i].inuse == 0) {
	33	dev->cmds[i].inuse = 1;
	34	dev->cmds[i].signalled = 0;
	35	dev->cmds[i].timeout = 0;
	36	ret = dev->cmds[i].seqno;
	37	break;
	38	}
	39	}
	40	mutex_unlock(&dev->lock);
	41
	42	return ret;
	43	}
	44
	45	void saa7164_cmd_free_seqno(struct saa7164_dev *dev, u8 seqno)
	46	{
	47	mutex_lock(&dev->lock);
	48	if ((dev->cmds[seqno].inuse == 1) &&
	49	(dev->cmds[seqno].seqno == seqno)) {
	50	dev->cmds[seqno].inuse = 0;
	51	dev->cmds[seqno].signalled = 0;
	52	dev->cmds[seqno].timeout = 0;
	53	}
	54	mutex_unlock(&dev->lock);
	55	}
	56
	57	void saa7164_cmd_timeout_seqno(struct saa7164_dev *dev, u8 seqno)
	58	{
	59	mutex_lock(&dev->lock);
	60	if ((dev->cmds[seqno].inuse == 1) &&
	61	(dev->cmds[seqno].seqno == seqno)) {
	62	dev->cmds[seqno].timeout = 1;
	63	}
	64	mutex_unlock(&dev->lock);
65	}
66
67	u32 saa7164_cmd_timeout_get(struct saa7164_dev *dev, u8 seqno)
68	{
69	int ret = 0;
70
71	mutex_lock(&dev->lock);
72	if ((dev->cmds[seqno].inuse == 1) &&
73	(dev->cmds[seqno].seqno == seqno)) {
74	ret = dev->cmds[seqno].timeout;
75	}
76	mutex_unlock(&dev->lock);
77
78	return ret;
79	}
80
81	/* Commands to the f/w get marshelled to/from this code then onto the PCI
82	* -bus/c running buffer. */
83	int saa7164_cmd_dequeue(struct saa7164_dev *dev)
84	{
85	int loop = 1;
86	int ret;
87	u32 timeout;
88	wait_queue_head_t *q = 0;
89	u8 tmp[512];
90	dprintk(DBGLVL_CMD, "%s()\n", __func__);
91
92	while (loop) {
93
94	tmComResInfo_t tRsp = { 0, 0, 0, 0, 0, 0 };
95	ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
96	if (ret == SAA_ERR_EMPTY)
97	return SAA_OK;
98
99	if (ret != SAA_OK)
100	return ret;
101
102	q = &dev->cmds[tRsp.seqno].wait;
103	timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
104	dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
105	if (timeout) {
106	printk(KERN_ERR "found timed out command on the bus\n");
107
108	/* Clean the bus */
109	ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
110	printk(KERN_ERR "ret = %x\n", ret);
111	if (ret == SAA_ERR_EMPTY)
112	/* Someone else already fetched the response */
113	return SAA_OK;
114
115	if (ret != SAA_OK)
116	return ret;
117
118	if (tRsp.flags & PVC_CMDFLAG_CONTINUE)
119	printk(KERN_ERR "split response\n");
120	else
121	saa7164_cmd_free_seqno(dev, tRsp.seqno);
122
123	printk(KERN_ERR " timeout continue\n");
124	continue;
125	}
126
127	dprintk(DBGLVL_CMD, "%s() signalled seqno(%d) (for dequeue)\n",
128	__func__, tRsp.seqno);
129	dev->cmds[tRsp.seqno].signalled = 1;
130	wake_up(q);
131	return SAA_OK;
132	}
133
134	return SAA_OK;
135	}
136
137	int saa7164_cmd_set(struct saa7164_dev dev, tmComResInfo_t msg, void *buf)
138	{
139	tmComResBusInfo_t *bus = &dev->bus;
140	u8 cmd_sent;
141	u16 size, idx;
142	u32 cmds;
143	void *tmp;
144	int ret = -1;
145
146	if (!msg) {
147	printk(KERN_ERR "%s() !msg\n", __func__);
148	return SAA_ERR_BAD_PARAMETER;
149	}
150
151	mutex_lock(&dev->cmds[msg->id].lock);
152
153	size = msg->size;
154	idx = 0;
155	cmds = size / bus->m_wMaxReqSize;
156	if (size % bus->m_wMaxReqSize == 0)
157	cmds -= 1;
158
159	cmd_sent = 0;
160
161	/* Split the request into smaller chunks */
162	for (idx = 0; idx < cmds; idx++) {
163
164	msg->flags \|= SAA_CMDFLAG_CONTINUE;
165	msg->size = bus->m_wMaxReqSize;
166	tmp = buf + idx * bus->m_wMaxReqSize;
167
168	ret = saa7164_bus_set(dev, msg, tmp);
169	if (ret != SAA_OK) {
170	printk(KERN_ERR "%s() set failed %d\n", __func__, ret);
171
172	if (cmd_sent) {
173	ret = SAA_ERR_BUSY;
174	goto out;
175	}
176	ret = SAA_ERR_OVERFLOW;
177	goto out;
178	}
179	cmd_sent = 1;
180	}
181
182	/* If not the last command... */
183	if (idx != 0)
184	msg->flags &= ~SAA_CMDFLAG_CONTINUE;
185
186	msg->size = size - idx * bus->m_wMaxReqSize;
187
188	ret = saa7164_bus_set(dev, msg, buf + idx * bus->m_wMaxReqSize);
189	if (ret != SAA_OK) {
190	printk(KERN_ERR "%s() set last failed %d\n", __func__, ret);
191
192	if (cmd_sent) {
193	ret = SAA_ERR_BUSY;
194	goto out;
195	}
196	ret = SAA_ERR_OVERFLOW;
197	goto out;
198	}
199	ret = SAA_OK;
200
201	out:
202	mutex_unlock(&dev->cmds[msg->id].lock);
203	return ret;
204	}
205
206	/* Wait for a signal event, without holding a mutex. Either return TIMEOUT if
207	* the event never occured, or SAA_OK if it was signaled during the wait.
208	*/
209	int saa7164_cmd_wait(struct saa7164_dev *dev, u8 seqno)
210	{
211	wait_queue_head_t *q = 0;
212	int ret = SAA_BUS_TIMEOUT;
213	unsigned long stamp;
214	int r;
215
216	if (debug >= 4)
217	saa7164_bus_dump(dev);
218
219	dprintk(DBGLVL_CMD, "%s(seqno=%d)\n", __func__, seqno);
220
221	mutex_lock(&dev->lock);
222	if ((dev->cmds[seqno].inuse == 1) &&
223	(dev->cmds[seqno].seqno == seqno)) {
224	q = &dev->cmds[seqno].wait;
225	}
226	mutex_unlock(&dev->lock);
227
228	if (q) {
229	/* If we haven't been signalled we need to wait */
230	if (dev->cmds[seqno].signalled == 0) {
231	stamp = jiffies;
232	dprintk(DBGLVL_CMD,
233	"%s(seqno=%d) Waiting (signalled=%d)\n",
234	__func__, seqno, dev->cmds[seqno].signalled);
235
236	/* Wait for signalled to be flagged or timeout */
bbf504c3 ST	237	/* In a highly stressed system this can easily extend
	238	* into multiple seconds before the deferred worker
	239	* is scheduled, and we're woken up via signal.
	240	* We typically are signalled in < 50ms but it can
	241	* take MUCH longer.
	242	*/
dd1ee444 ST	243	wait_event_timeout(q, dev->cmds[seqno].signalled, (HZ waitsecs));
dd1ee444 ST	244	r = time_before(jiffies, stamp + (HZ * waitsecs));
443c1228 ST	245	if (r)
	246	ret = SAA_OK;
	247	else
	248	saa7164_cmd_timeout_seqno(dev, seqno);
	249
	250	dprintk(DBGLVL_CMD, "%s(seqno=%d) Waiting res = %d "
	251	"(signalled=%d)\n", __func__, seqno, r,
	252	dev->cmds[seqno].signalled);
	253	} else
	254	ret = SAA_OK;
	255	} else
	256	printk(KERN_ERR "%s(seqno=%d) seqno is invalid\n",
	257	__func__, seqno);
	258
	259	return ret;
	260	}
	261
	262	void saa7164_cmd_signal(struct saa7164_dev *dev, u8 seqno)
	263	{
	264	int i;
	265	dprintk(DBGLVL_CMD, "%s()\n", __func__);
	266
	267	mutex_lock(&dev->lock);
	268	for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
	269	if (dev->cmds[i].inuse == 1) {
	270	dprintk(DBGLVL_CMD,
	271	"seqno %d inuse, sig = %d, t/out = %d\n",
	272	dev->cmds[i].seqno,
	273	dev->cmds[i].signalled,
	274	dev->cmds[i].timeout);
	275	}
	276	}
	277
	278	for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
	279	if ((dev->cmds[i].inuse == 1) && ((i == 0) \|\|
	280	(dev->cmds[i].signalled) \|\| (dev->cmds[i].timeout))) {
	281	dprintk(DBGLVL_CMD, "%s(seqno=%d) calling wake_up\n",
	282	__func__, i);
	283	dev->cmds[i].signalled = 1;
	284	wake_up(&dev->cmds[i].wait);
	285	}
	286	}
	287	mutex_unlock(&dev->lock);
	288	}
	289
	290	int saa7164_cmd_send(struct saa7164_dev *dev, u8 id, tmComResCmd_t command,
	291	u16 controlselector, u16 size, void *buf)
	292	{
	293	tmComResInfo_t command_t, *pcommand_t;
	294	tmComResInfo_t response_t, *presponse_t;
	295	u8 errdata[256];
	296	u16 resp_dsize;
	297	u16 data_recd;
	298	u32 loop;
	299	int ret;
	300	int safety = 0;
	301
	302	dprintk(DBGLVL_CMD, "%s(unitid = %s (%d) , command = 0x%x, "
	303	"sel = 0x%x)\n", __func__, saa7164_unitid_name(dev, id), id,
	304	command, controlselector);
	305
	306	if ((size == 0) \|\| (buf == 0)) {
	307	printk(KERN_ERR "%s() Invalid param\n", __func__);
	308	return SAA_ERR_BAD_PARAMETER;
309	}
310
311	/* Prepare some basic command/response structures */
312	memset(&command_t, 0, sizeof(command_t));
313	memset(&response_t, 0, sizeof(&response_t));
314	pcommand_t = &command_t;
315	presponse_t = &response_t;
316	command_t.id = id;
317	command_t.command = command;
318	command_t.controlselector = controlselector;
319	command_t.size = size;
320
321	/* Allocate a unique sequence number */
322	ret = saa7164_cmd_alloc_seqno(dev);
323	if (ret < 0) {
324	printk(KERN_ERR "%s() No free sequences\n", __func__);
325	ret = SAA_ERR_NO_RESOURCES;
326	goto out;
327	}
328
329	command_t.seqno = (u8)ret;
330
331	/* Send Command */
332	resp_dsize = size;
333	pcommand_t->size = size;
334
335	dprintk(DBGLVL_CMD, "%s() pcommand_t.seqno = %d\n",
336	__func__, pcommand_t->seqno);
337
338	dprintk(DBGLVL_CMD, "%s() pcommand_t.size = %d\n",
339	__func__, pcommand_t->size);
340
341	ret = saa7164_cmd_set(dev, pcommand_t, buf);
342	if (ret != SAA_OK) {
343	printk(KERN_ERR "%s() set command failed %d\n", __func__, ret);
344
345	if (ret != SAA_ERR_BUSY)
346	saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
347	else
348	/* Flag a timeout, because at least one
349	* command was sent */
350	saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
351
352	goto out;
353	}
354
355	/* With split responses we have to collect the msgs piece by piece */
356	data_recd = 0;
357	loop = 1;
358	while (loop) {
359	dprintk(DBGLVL_CMD, "%s() loop\n", __func__);
360
361	ret = saa7164_cmd_wait(dev, pcommand_t->seqno);
362	dprintk(DBGLVL_CMD, "%s() loop ret = %d\n", __func__, ret);
363
364	/* if power is down and this is not a power command ... */
365
366	if (ret == SAA_BUS_TIMEOUT) {
367	printk(KERN_ERR "Event timed out\n");
368	saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
369	return ret;
370	}
371
372	if (ret != SAA_OK) {
373	printk(KERN_ERR "spurious error\n");
374	return ret;
375	}
376
377	/* Peek response */
378	ret = saa7164_bus_get(dev, presponse_t, NULL, 1);
379	if (ret == SAA_ERR_EMPTY) {
380	dprintk(4, "%s() SAA_ERR_EMPTY\n", __func__);
381	continue;
382	}
383	if (ret != SAA_OK) {
384	printk(KERN_ERR "peek failed\n");
385	return ret;
386	}
387
388	dprintk(DBGLVL_CMD, "%s() presponse_t->seqno = %d\n",
389	__func__, presponse_t->seqno);
390
391	dprintk(DBGLVL_CMD, "%s() presponse_t->flags = 0x%x\n",
392	__func__, presponse_t->flags);
393
394	dprintk(DBGLVL_CMD, "%s() presponse_t->size = %d\n",
395	__func__, presponse_t->size);
396
397	/* Check if the response was for our command */
398	if (presponse_t->seqno != pcommand_t->seqno) {
399
400	dprintk(DBGLVL_CMD,
401	"wrong event: seqno = %d, "
402	"expected seqno = %d, "
403	"will dequeue regardless\n",
404	presponse_t->seqno, pcommand_t->seqno);
405
406	ret = saa7164_cmd_dequeue(dev);
407	if (ret != SAA_OK) {
408	printk(KERN_ERR "dequeue failed, ret = %d\n",
409	ret);
410	if (safety++ > 16) {
411	printk(KERN_ERR
412	"dequeue exceeded, safety exit\n");
413	return SAA_ERR_BUSY;
414	}
415	}
416
417	continue;
418	}
419
420	if ((presponse_t->flags & PVC_RESPONSEFLAG_ERROR) != 0) {
421
422	memset(&errdata[0], 0, sizeof(errdata));
423
424	ret = saa7164_bus_get(dev, presponse_t, &errdata[0], 0);
425	if (ret != SAA_OK) {
426	printk(KERN_ERR "get error(2)\n");
427	return ret;
428	}
429
430	saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
431
432	dprintk(DBGLVL_CMD, "%s() errdata %02x%02x%02x%02x\n",
433	__func__, errdata[0], errdata[1], errdata[2],
434	errdata[3]);
435
436	/* Map error codes */
437	dprintk(DBGLVL_CMD, "%s() cmd, error code = 0x%x\n",
438	__func__, errdata[0]);
439
440	switch (errdata[0]) {
441	case PVC_ERRORCODE_INVALID_COMMAND:
442	dprintk(DBGLVL_CMD, "%s() INVALID_COMMAND\n",
443	__func__);
444	ret = SAA_ERR_INVALID_COMMAND;
445	break;
446	case PVC_ERRORCODE_INVALID_DATA:
447	dprintk(DBGLVL_CMD, "%s() INVALID_DATA\n",
448	__func__);
449	ret = SAA_ERR_BAD_PARAMETER;
450	break;
451	case PVC_ERRORCODE_TIMEOUT:
452	dprintk(DBGLVL_CMD, "%s() TIMEOUT\n", __func__);
453	ret = SAA_ERR_TIMEOUT;
454	break;
455	case PVC_ERRORCODE_NAK:
456	dprintk(DBGLVL_CMD, "%s() NAK\n", __func__);
457	ret = SAA_ERR_NULL_PACKET;
458	break;
459	case PVC_ERRORCODE_UNKNOWN:
460	case PVC_ERRORCODE_INVALID_CONTROL:
461	dprintk(DBGLVL_CMD,
462	"%s() UNKNOWN OR INVALID CONTROL\n",
463	__func__);
464	default:
465	dprintk(DBGLVL_CMD, "%s() UNKNOWN\n", __func__);
466	ret = SAA_ERR_NOT_SUPPORTED;
467	}
468
469	/* See of other commands are on the bus */
470	if (saa7164_cmd_dequeue(dev) != SAA_OK)
471	printk(KERN_ERR "dequeue(2) failed\n");
472
473	return ret;
474	}
475
476	/* If response is invalid */
477	if ((presponse_t->id != pcommand_t->id) \|\|
478	(presponse_t->command != pcommand_t->command) \|\|
479	(presponse_t->controlselector !=
480	pcommand_t->controlselector) \|\|
481	(((resp_dsize - data_recd) != presponse_t->size) &&
482	!(presponse_t->flags & PVC_CMDFLAG_CONTINUE)) \|\|
483	((resp_dsize - data_recd) < presponse_t->size)) {
484
485	/* Invalid */
486	dprintk(DBGLVL_CMD, "%s() Invalid\n", __func__);
487	ret = saa7164_bus_get(dev, presponse_t, 0, 0);
488	if (ret != SAA_OK) {
489	printk(KERN_ERR "get failed\n");
490	return ret;
491	}
492
493	/* See of other commands are on the bus */
494	if (saa7164_cmd_dequeue(dev) != SAA_OK)
495	printk(KERN_ERR "dequeue(3) failed\n");
496	continue;
497	}
498
499	/* OK, now we're actually getting out correct response */
500	ret = saa7164_bus_get(dev, presponse_t, buf + data_recd, 0);
501	if (ret != SAA_OK) {
502	printk(KERN_ERR "get failed\n");
503	return ret;
504	}
505
506	data_recd = presponse_t->size + data_recd;
507	if (resp_dsize == data_recd) {
508	dprintk(DBGLVL_CMD, "%s() Resp recd\n", __func__);
509	break;
510	}
511
512	/* See of other commands are on the bus */
513	if (saa7164_cmd_dequeue(dev) != SAA_OK)
514	printk(KERN_ERR "dequeue(3) failed\n");
515
516	continue;
517
518	} /* (loop) */
519
520	/* Release the sequence number allocation */
521	saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
522
523	/* if powerdown signal all pending commands */
524
525	dprintk(DBGLVL_CMD, "%s() Calling dequeue then exit\n", __func__);
526
527	/* See of other commands are on the bus */
528	if (saa7164_cmd_dequeue(dev) != SAA_OK)
529	printk(KERN_ERR "dequeue(4) failed\n");
530
531	ret = SAA_OK;
532	out:
533	return ret;
534	}
535