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solo6010-p2m.c
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solo6010-p2m.c
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/*
* Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
* Copyright (C) 2010,2011 Ben Collins <bcollins@bluecherry.net>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/kernel.h>
#include "solo6010.h"
int solo_p2m_dma(struct solo6010_dev *solo_dev, int wr,
void *sys_addr, u32 ext_addr, u32 size,
int repeat, u32 ext_size)
{
dma_addr_t dma_addr;
int ret;
if (WARN_ON_ONCE((unsigned long)sys_addr & 0x03))
return -EINVAL;
if (WARN_ON_ONCE(!size))
return -EINVAL;
dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
ret = solo_p2m_dma_t(solo_dev, wr, dma_addr, ext_addr, size,
repeat, ext_size);
pci_unmap_single(solo_dev->pdev, dma_addr, size,
wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
return ret;
}
/* Mutex must be held for p2m_id before calling this!! */
int solo_p2m_dma_desc(struct solo6010_dev *solo_dev,
struct solo_p2m_desc *desc, dma_addr_t desc_dma,
int desc_cnt)
{
struct solo_p2m_dev *p2m_dev;
unsigned int timeout = 0;
unsigned int config = 0;
int ret = 0;
int p2m_id;
/* Get next ID */
p2m_id = atomic_inc_return(&solo_dev->p2m_count) % SOLO_NR_P2M;
if (p2m_id < 0)
p2m_id = 0 - p2m_id;
p2m_dev = &solo_dev->p2m_dev[p2m_id];
if (mutex_lock_interruptible(&p2m_dev->mutex))
return -EINTR;
INIT_COMPLETION(p2m_dev->completion);
p2m_dev->error = 0;
if (desc_cnt > 1) {
/* We only need to do this when we have more than one
* descriptor. */
config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(p2m_id));
solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(p2m_id), desc_dma);
solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(p2m_id), desc_cnt);
solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config |
SOLO_P2M_DESC_MODE);
} else {
solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(p2m_id), desc[1].dma_addr);
solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(p2m_id), desc[1].ext_addr);
solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(p2m_id), desc[1].cfg);
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), desc[1].ctrl);
}
timeout = wait_for_completion_timeout(&p2m_dev->completion,
msecs_to_jiffies(solo_dev->p2m_msecs));
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), 0);
if (desc_cnt > 1)
solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config);
if (WARN_ON_ONCE(p2m_dev->error))
ret = -EIO;
else if (timeout == 0)
ret = -EAGAIN;
mutex_unlock(&p2m_dev->mutex);
return ret;
}
void solo_p2m_fill_desc(struct solo_p2m_desc *desc, int wr,
dma_addr_t dma_addr, u32 ext_addr, u32 size,
int repeat, u32 ext_size)
{
desc->cfg = SOLO_P2M_COPY_SIZE(size >> 2);
desc->ctrl = SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
(wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON;
if (repeat) {
desc->cfg |= SOLO_P2M_EXT_INC(ext_size >> 2);
desc->ctrl |= SOLO_P2M_PCI_INC(size >> 2) |
SOLO_P2M_REPEAT(repeat);
}
desc->dma_addr = dma_addr;
desc->ext_addr = ext_addr;
}
int solo_p2m_dma_t(struct solo6010_dev *solo_dev, int wr,
dma_addr_t dma_addr, u32 ext_addr, u32 size,
int repeat, u32 ext_size)
{
struct solo_p2m_desc desc[2];
solo_p2m_fill_desc(&desc[1], wr, dma_addr, ext_addr, size, repeat,
ext_size);
/* No need for desc_dma since we know it is a single-shot */
return solo_p2m_dma_desc(solo_dev, desc, 0, 1);
}
void solo_p2m_isr(struct solo6010_dev *solo_dev, int id)
{
complete(&solo_dev->p2m_dev[id].completion);
}
void solo_p2m_error_isr(struct solo6010_dev *solo_dev, u32 status)
{
struct solo_p2m_dev *p2m_dev;
int i;
if (!(status & SOLO_PCI_ERR_P2M))
return;
for (i = 0; i < SOLO_NR_P2M; i++) {
p2m_dev = &solo_dev->p2m_dev[i];
p2m_dev->error = 1;
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
complete(&p2m_dev->completion);
}
}
void solo_p2m_exit(struct solo6010_dev *solo_dev)
{
int i;
for (i = 0; i < SOLO_NR_P2M; i++)
solo6010_irq_off(solo_dev, SOLO_IRQ_P2M(i));
}
int solo_p2m_init(struct solo6010_dev *solo_dev)
{
struct solo_p2m_dev *p2m_dev;
int i;
for (i = 0; i < SOLO_NR_P2M; i++) {
p2m_dev = &solo_dev->p2m_dev[i];
mutex_init(&p2m_dev->mutex);
init_completion(&p2m_dev->completion);
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
SOLO_P2M_CSC_16BIT_565 |
SOLO_P2M_DESC_INTR_OPT |
SOLO_P2M_DMA_INTERVAL(0) |
SOLO_P2M_PCI_MASTER_MODE);
solo6010_irq_on(solo_dev, SOLO_IRQ_P2M(i));
}
return 0;
}