583 lines
14 KiB
C
583 lines
14 KiB
C
/*
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* Driver for the NXP SAA7164 PCIe bridge
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*
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* Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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*
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* GNU General Public License for more details.
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*/
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#include <linux/wait.h>
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#include "saa7164.h"
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static int saa7164_cmd_alloc_seqno(struct saa7164_dev *dev)
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{
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int i, ret = -1;
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mutex_lock(&dev->lock);
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for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
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if (dev->cmds[i].inuse == 0) {
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dev->cmds[i].inuse = 1;
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dev->cmds[i].signalled = 0;
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dev->cmds[i].timeout = 0;
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ret = dev->cmds[i].seqno;
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break;
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}
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}
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mutex_unlock(&dev->lock);
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return ret;
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}
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static void saa7164_cmd_free_seqno(struct saa7164_dev *dev, u8 seqno)
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{
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mutex_lock(&dev->lock);
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if ((dev->cmds[seqno].inuse == 1) &&
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(dev->cmds[seqno].seqno == seqno)) {
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dev->cmds[seqno].inuse = 0;
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dev->cmds[seqno].signalled = 0;
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dev->cmds[seqno].timeout = 0;
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}
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mutex_unlock(&dev->lock);
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}
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static void saa7164_cmd_timeout_seqno(struct saa7164_dev *dev, u8 seqno)
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{
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mutex_lock(&dev->lock);
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if ((dev->cmds[seqno].inuse == 1) &&
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(dev->cmds[seqno].seqno == seqno)) {
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dev->cmds[seqno].timeout = 1;
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}
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mutex_unlock(&dev->lock);
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}
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static u32 saa7164_cmd_timeout_get(struct saa7164_dev *dev, u8 seqno)
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{
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int ret = 0;
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mutex_lock(&dev->lock);
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if ((dev->cmds[seqno].inuse == 1) &&
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(dev->cmds[seqno].seqno == seqno)) {
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ret = dev->cmds[seqno].timeout;
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}
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mutex_unlock(&dev->lock);
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return ret;
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}
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/* Commands to the f/w get marshelled to/from this code then onto the PCI
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* -bus/c running buffer. */
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int saa7164_irq_dequeue(struct saa7164_dev *dev)
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{
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int ret = SAA_OK, i = 0;
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u32 timeout;
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wait_queue_head_t *q = NULL;
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u8 tmp[512];
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dprintk(DBGLVL_CMD, "%s()\n", __func__);
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/* While any outstand message on the bus exists... */
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do {
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/* Peek the msg bus */
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struct tmComResInfo tRsp = { 0, 0, 0, 0, 0, 0 };
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ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
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if (ret != SAA_OK)
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break;
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q = &dev->cmds[tRsp.seqno].wait;
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timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
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dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
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if (!timeout) {
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dprintk(DBGLVL_CMD,
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"%s() signalled seqno(%d) (for dequeue)\n",
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__func__, tRsp.seqno);
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dev->cmds[tRsp.seqno].signalled = 1;
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wake_up(q);
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} else {
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printk(KERN_ERR
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"%s() found timed out command on the bus\n",
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__func__);
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/* Clean the bus */
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ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
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printk(KERN_ERR "%s() ret = %x\n", __func__, ret);
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if (ret == SAA_ERR_EMPTY)
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/* Someone else already fetched the response */
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return SAA_OK;
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if (ret != SAA_OK)
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return ret;
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}
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/* It's unlikely to have more than 4 or 5 pending messages,
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* ensure we exit at some point regardless.
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*/
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} while (i++ < 32);
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return ret;
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}
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/* Commands to the f/w get marshelled to/from this code then onto the PCI
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* -bus/c running buffer. */
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static int saa7164_cmd_dequeue(struct saa7164_dev *dev)
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{
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int ret;
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u32 timeout;
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wait_queue_head_t *q = NULL;
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u8 tmp[512];
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dprintk(DBGLVL_CMD, "%s()\n", __func__);
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while (true) {
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struct tmComResInfo tRsp = { 0, 0, 0, 0, 0, 0 };
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ret = saa7164_bus_get(dev, &tRsp, NULL, 1);
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if (ret == SAA_ERR_EMPTY)
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return SAA_OK;
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if (ret != SAA_OK)
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return ret;
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q = &dev->cmds[tRsp.seqno].wait;
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timeout = saa7164_cmd_timeout_get(dev, tRsp.seqno);
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dprintk(DBGLVL_CMD, "%s() timeout = %d\n", __func__, timeout);
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if (timeout) {
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printk(KERN_ERR "found timed out command on the bus\n");
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/* Clean the bus */
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ret = saa7164_bus_get(dev, &tRsp, &tmp, 0);
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printk(KERN_ERR "ret = %x\n", ret);
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if (ret == SAA_ERR_EMPTY)
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/* Someone else already fetched the response */
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return SAA_OK;
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if (ret != SAA_OK)
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return ret;
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if (tRsp.flags & PVC_CMDFLAG_CONTINUE)
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printk(KERN_ERR "split response\n");
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else
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saa7164_cmd_free_seqno(dev, tRsp.seqno);
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printk(KERN_ERR " timeout continue\n");
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continue;
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}
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dprintk(DBGLVL_CMD, "%s() signalled seqno(%d) (for dequeue)\n",
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__func__, tRsp.seqno);
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dev->cmds[tRsp.seqno].signalled = 1;
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wake_up(q);
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return SAA_OK;
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}
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}
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static int saa7164_cmd_set(struct saa7164_dev *dev, struct tmComResInfo *msg,
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void *buf)
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{
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struct tmComResBusInfo *bus = &dev->bus;
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u8 cmd_sent;
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u16 size, idx;
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u32 cmds;
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void *tmp;
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int ret = -1;
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if (!msg) {
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printk(KERN_ERR "%s() !msg\n", __func__);
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return SAA_ERR_BAD_PARAMETER;
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}
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mutex_lock(&dev->cmds[msg->id].lock);
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size = msg->size;
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idx = 0;
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cmds = size / bus->m_wMaxReqSize;
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if (size % bus->m_wMaxReqSize == 0)
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cmds -= 1;
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cmd_sent = 0;
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/* Split the request into smaller chunks */
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for (idx = 0; idx < cmds; idx++) {
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msg->flags |= SAA_CMDFLAG_CONTINUE;
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msg->size = bus->m_wMaxReqSize;
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tmp = buf + idx * bus->m_wMaxReqSize;
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ret = saa7164_bus_set(dev, msg, tmp);
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if (ret != SAA_OK) {
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printk(KERN_ERR "%s() set failed %d\n", __func__, ret);
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if (cmd_sent) {
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ret = SAA_ERR_BUSY;
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goto out;
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}
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ret = SAA_ERR_OVERFLOW;
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goto out;
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}
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cmd_sent = 1;
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}
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/* If not the last command... */
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if (idx != 0)
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msg->flags &= ~SAA_CMDFLAG_CONTINUE;
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msg->size = size - idx * bus->m_wMaxReqSize;
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ret = saa7164_bus_set(dev, msg, buf + idx * bus->m_wMaxReqSize);
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if (ret != SAA_OK) {
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printk(KERN_ERR "%s() set last failed %d\n", __func__, ret);
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if (cmd_sent) {
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ret = SAA_ERR_BUSY;
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goto out;
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}
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ret = SAA_ERR_OVERFLOW;
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goto out;
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}
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ret = SAA_OK;
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out:
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mutex_unlock(&dev->cmds[msg->id].lock);
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return ret;
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}
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/* Wait for a signal event, without holding a mutex. Either return TIMEOUT if
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* the event never occurred, or SAA_OK if it was signaled during the wait.
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*/
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static int saa7164_cmd_wait(struct saa7164_dev *dev, u8 seqno)
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{
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wait_queue_head_t *q = NULL;
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int ret = SAA_BUS_TIMEOUT;
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unsigned long stamp;
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int r;
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if (saa_debug >= 4)
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saa7164_bus_dump(dev);
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dprintk(DBGLVL_CMD, "%s(seqno=%d)\n", __func__, seqno);
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mutex_lock(&dev->lock);
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if ((dev->cmds[seqno].inuse == 1) &&
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(dev->cmds[seqno].seqno == seqno)) {
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q = &dev->cmds[seqno].wait;
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}
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mutex_unlock(&dev->lock);
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if (q) {
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/* If we haven't been signalled we need to wait */
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if (dev->cmds[seqno].signalled == 0) {
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stamp = jiffies;
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dprintk(DBGLVL_CMD,
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"%s(seqno=%d) Waiting (signalled=%d)\n",
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__func__, seqno, dev->cmds[seqno].signalled);
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/* Wait for signalled to be flagged or timeout */
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/* In a highly stressed system this can easily extend
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* into multiple seconds before the deferred worker
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* is scheduled, and we're woken up via signal.
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* We typically are signalled in < 50ms but it can
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* take MUCH longer.
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*/
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wait_event_timeout(*q, dev->cmds[seqno].signalled,
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(HZ * waitsecs));
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r = time_before(jiffies, stamp + (HZ * waitsecs));
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if (r)
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ret = SAA_OK;
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else
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saa7164_cmd_timeout_seqno(dev, seqno);
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dprintk(DBGLVL_CMD, "%s(seqno=%d) Waiting res = %d (signalled=%d)\n",
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__func__, seqno, r,
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dev->cmds[seqno].signalled);
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} else
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ret = SAA_OK;
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} else
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printk(KERN_ERR "%s(seqno=%d) seqno is invalid\n",
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__func__, seqno);
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return ret;
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}
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void saa7164_cmd_signal(struct saa7164_dev *dev, u8 seqno)
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{
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int i;
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dprintk(DBGLVL_CMD, "%s()\n", __func__);
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mutex_lock(&dev->lock);
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for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
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if (dev->cmds[i].inuse == 1) {
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dprintk(DBGLVL_CMD,
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"seqno %d inuse, sig = %d, t/out = %d\n",
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dev->cmds[i].seqno,
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dev->cmds[i].signalled,
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dev->cmds[i].timeout);
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}
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}
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for (i = 0; i < SAA_CMD_MAX_MSG_UNITS; i++) {
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if ((dev->cmds[i].inuse == 1) && ((i == 0) ||
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(dev->cmds[i].signalled) || (dev->cmds[i].timeout))) {
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dprintk(DBGLVL_CMD, "%s(seqno=%d) calling wake_up\n",
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__func__, i);
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dev->cmds[i].signalled = 1;
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wake_up(&dev->cmds[i].wait);
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}
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}
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mutex_unlock(&dev->lock);
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}
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int saa7164_cmd_send(struct saa7164_dev *dev, u8 id, enum tmComResCmd command,
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u16 controlselector, u16 size, void *buf)
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{
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struct tmComResInfo command_t, *pcommand_t;
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struct tmComResInfo response_t, *presponse_t;
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u8 errdata[256];
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u16 resp_dsize;
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u16 data_recd;
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u32 loop;
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int ret;
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int safety = 0;
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dprintk(DBGLVL_CMD, "%s(unitid = %s (%d) , command = 0x%x, sel = 0x%x)\n",
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__func__, saa7164_unitid_name(dev, id), id,
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command, controlselector);
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if ((size == 0) || (buf == NULL)) {
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printk(KERN_ERR "%s() Invalid param\n", __func__);
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return SAA_ERR_BAD_PARAMETER;
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}
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/* Prepare some basic command/response structures */
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memset(&command_t, 0, sizeof(command_t));
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memset(&response_t, 0, sizeof(response_t));
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pcommand_t = &command_t;
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presponse_t = &response_t;
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command_t.id = id;
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command_t.command = command;
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command_t.controlselector = controlselector;
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command_t.size = size;
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/* Allocate a unique sequence number */
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ret = saa7164_cmd_alloc_seqno(dev);
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if (ret < 0) {
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printk(KERN_ERR "%s() No free sequences\n", __func__);
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ret = SAA_ERR_NO_RESOURCES;
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goto out;
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}
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command_t.seqno = (u8)ret;
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/* Send Command */
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resp_dsize = size;
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pcommand_t->size = size;
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dprintk(DBGLVL_CMD, "%s() pcommand_t.seqno = %d\n",
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__func__, pcommand_t->seqno);
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dprintk(DBGLVL_CMD, "%s() pcommand_t.size = %d\n",
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__func__, pcommand_t->size);
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ret = saa7164_cmd_set(dev, pcommand_t, buf);
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if (ret != SAA_OK) {
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printk(KERN_ERR "%s() set command failed %d\n", __func__, ret);
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if (ret != SAA_ERR_BUSY)
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saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
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else
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/* Flag a timeout, because at least one
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* command was sent */
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saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
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goto out;
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}
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/* With split responses we have to collect the msgs piece by piece */
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data_recd = 0;
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loop = 1;
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while (loop) {
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dprintk(DBGLVL_CMD, "%s() loop\n", __func__);
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ret = saa7164_cmd_wait(dev, pcommand_t->seqno);
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dprintk(DBGLVL_CMD, "%s() loop ret = %d\n", __func__, ret);
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/* if power is down and this is not a power command ... */
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if (ret == SAA_BUS_TIMEOUT) {
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printk(KERN_ERR "Event timed out\n");
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saa7164_cmd_timeout_seqno(dev, pcommand_t->seqno);
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return ret;
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}
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if (ret != SAA_OK) {
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printk(KERN_ERR "spurious error\n");
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return ret;
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}
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/* Peek response */
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ret = saa7164_bus_get(dev, presponse_t, NULL, 1);
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if (ret == SAA_ERR_EMPTY) {
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dprintk(4, "%s() SAA_ERR_EMPTY\n", __func__);
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continue;
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}
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if (ret != SAA_OK) {
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printk(KERN_ERR "peek failed\n");
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return ret;
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}
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dprintk(DBGLVL_CMD, "%s() presponse_t->seqno = %d\n",
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__func__, presponse_t->seqno);
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dprintk(DBGLVL_CMD, "%s() presponse_t->flags = 0x%x\n",
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__func__, presponse_t->flags);
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dprintk(DBGLVL_CMD, "%s() presponse_t->size = %d\n",
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__func__, presponse_t->size);
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/* Check if the response was for our command */
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if (presponse_t->seqno != pcommand_t->seqno) {
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dprintk(DBGLVL_CMD,
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"wrong event: seqno = %d, expected seqno = %d, will dequeue regardless\n",
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presponse_t->seqno, pcommand_t->seqno);
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ret = saa7164_cmd_dequeue(dev);
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if (ret != SAA_OK) {
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printk(KERN_ERR "dequeue failed, ret = %d\n",
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ret);
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if (safety++ > 16) {
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printk(KERN_ERR
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"dequeue exceeded, safety exit\n");
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return SAA_ERR_BUSY;
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}
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}
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continue;
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}
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|
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if ((presponse_t->flags & PVC_RESPONSEFLAG_ERROR) != 0) {
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memset(&errdata[0], 0, sizeof(errdata));
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ret = saa7164_bus_get(dev, presponse_t, &errdata[0], 0);
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if (ret != SAA_OK) {
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printk(KERN_ERR "get error(2)\n");
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return ret;
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}
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|
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saa7164_cmd_free_seqno(dev, pcommand_t->seqno);
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|
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dprintk(DBGLVL_CMD, "%s() errdata %02x%02x%02x%02x\n",
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__func__, errdata[0], errdata[1], errdata[2],
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errdata[3]);
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|
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/* Map error codes */
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dprintk(DBGLVL_CMD, "%s() cmd, error code = 0x%x\n",
|
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__func__, errdata[0]);
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|
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switch (errdata[0]) {
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case PVC_ERRORCODE_INVALID_COMMAND:
|
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dprintk(DBGLVL_CMD, "%s() INVALID_COMMAND\n",
|
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__func__);
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ret = SAA_ERR_INVALID_COMMAND;
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break;
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case PVC_ERRORCODE_INVALID_DATA:
|
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dprintk(DBGLVL_CMD, "%s() INVALID_DATA\n",
|
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__func__);
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ret = SAA_ERR_BAD_PARAMETER;
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break;
|
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case PVC_ERRORCODE_TIMEOUT:
|
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dprintk(DBGLVL_CMD, "%s() TIMEOUT\n", __func__);
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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__);
|
|
ret = SAA_ERR_NOT_SUPPORTED;
|
|
break;
|
|
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;
|
|
}
|
|
|