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linux/drivers/media/pci/solo6x10/solo6x10-p2m.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
*
* Original author:
* Ben Collins <bcollins@ubuntu.com>
*
* Additional work by:
* John Brooks <john.brooks@bluecherry.net>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "solo6x10.h"
static int multi_p2m;
module_param(multi_p2m, uint, 0644);
MODULE_PARM_DESC(multi_p2m,
"Use multiple P2M DMA channels (default: no, 6010-only)");
static int desc_mode;
module_param(desc_mode, uint, 0644);
MODULE_PARM_DESC(desc_mode,
"Allow use of descriptor mode DMA (default: no, 6010-only)");
int solo_p2m_dma(struct solo_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);
if (pci_dma_mapping_error(solo_dev->pdev, dma_addr))
return -ENOMEM;
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 solo_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;
unsigned int config = 0;
int ret = 0;
unsigned int p2m_id = 0;
/* Get next ID. According to Softlogic, 6110 has problems on !=0 P2M */
if (solo_dev->type != SOLO_DEV_6110 && multi_p2m)
p2m_id = atomic_inc_return(&solo_dev->p2m_count) % SOLO_NR_P2M;
p2m_dev = &solo_dev->p2m_dev[p2m_id];
if (mutex_lock_interruptible(&p2m_dev->mutex))
return -EINTR;
reinit_completion(&p2m_dev->completion);
p2m_dev->error = 0;
if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && desc_mode) {
/* For 6010 with more than one desc, we can do a one-shot */
p2m_dev->desc_count = p2m_dev->desc_idx = 0;
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 {
/* For single descriptors and 6110, we need to run each desc */
p2m_dev->desc_count = desc_cnt;
p2m_dev->desc_idx = 1;
p2m_dev->descs = desc;
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,
solo_dev->p2m_jiffies);
if (WARN_ON_ONCE(p2m_dev->error))
ret = -EIO;
else if (timeout == 0) {
solo_dev->p2m_timeouts++;
ret = -EAGAIN;
}
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), 0);
/* Don't write here for the no_desc_mode case, because config is 0.
* We can't test no_desc_mode again, it might race. */
if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && config)
solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config);
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)
{
WARN_ON_ONCE(dma_addr & 0x03);
WARN_ON_ONCE(!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 solo_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 solo_dev *solo_dev, int id)
{
struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
struct solo_p2m_desc *desc;
if (p2m_dev->desc_count <= p2m_dev->desc_idx) {
complete(&p2m_dev->completion);
return;
}
/* Setup next descriptor */
p2m_dev->desc_idx++;
desc = &p2m_dev->descs[p2m_dev->desc_idx];
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(id), desc->dma_addr);
solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(id), desc->ext_addr);
solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(id), desc->cfg);
solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), desc->ctrl);
}
void solo_p2m_error_isr(struct solo_dev *solo_dev)
{
unsigned int err = solo_reg_read(solo_dev, SOLO_PCI_ERR);
struct solo_p2m_dev *p2m_dev;
int i;
if (!(err & (SOLO_PCI_ERR_P2M | SOLO_PCI_ERR_P2M_DESC)))
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 solo_dev *solo_dev)
{
int i;
for (i = 0; i < SOLO_NR_P2M; i++)
solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
}
static int solo_p2m_test(struct solo_dev *solo_dev, int base, int size)
{
u32 *wr_buf;
u32 *rd_buf;
int i;
int ret = -EIO;
int order = get_order(size);
wr_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
if (wr_buf == NULL)
return -1;
rd_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
if (rd_buf == NULL) {
free_pages((unsigned long)wr_buf, order);
return -1;
}
for (i = 0; i < (size >> 3); i++)
*(wr_buf + i) = (i << 16) | (i + 1);
for (i = (size >> 3); i < (size >> 2); i++)
*(wr_buf + i) = ~((i << 16) | (i + 1));
memset(rd_buf, 0x55, size);
if (solo_p2m_dma(solo_dev, 1, wr_buf, base, size, 0, 0))
goto test_fail;
if (solo_p2m_dma(solo_dev, 0, rd_buf, base, size, 0, 0))
goto test_fail;
for (i = 0; i < (size >> 2); i++) {
if (*(wr_buf + i) != *(rd_buf + i))
goto test_fail;
}
ret = 0;
test_fail:
free_pages((unsigned long)wr_buf, order);
free_pages((unsigned long)rd_buf, order);
return ret;
}
int solo_p2m_init(struct solo_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);
solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
}
/* Find correct SDRAM size */
for (solo_dev->sdram_size = 0, i = 2; i >= 0; i--) {
solo_reg_write(solo_dev, SOLO_DMA_CTRL,
SOLO_DMA_CTRL_REFRESH_CYCLE(1) |
SOLO_DMA_CTRL_SDRAM_SIZE(i) |
SOLO_DMA_CTRL_SDRAM_CLK_INVERT |
SOLO_DMA_CTRL_READ_CLK_SELECT |
SOLO_DMA_CTRL_LATENCY(1));
solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config |
SOLO_SYS_CFG_RESET);
solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config);
switch (i) {
case 2:
if (solo_p2m_test(solo_dev, 0x07ff0000, 0x00010000) ||
solo_p2m_test(solo_dev, 0x05ff0000, 0x00010000))
continue;
break;
case 1:
if (solo_p2m_test(solo_dev, 0x03ff0000, 0x00010000))
continue;
break;
default:
if (solo_p2m_test(solo_dev, 0x01ff0000, 0x00010000))
continue;
}
solo_dev->sdram_size = (32 << 20) << i;
break;
}
if (!solo_dev->sdram_size) {
dev_err(&solo_dev->pdev->dev, "Error detecting SDRAM size\n");
return -EIO;
}
if (SOLO_SDRAM_END(solo_dev) > solo_dev->sdram_size) {
dev_err(&solo_dev->pdev->dev,
"SDRAM is not large enough (%u < %u)\n",
solo_dev->sdram_size, SOLO_SDRAM_END(solo_dev));
return -EIO;
}
return 0;
}
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