blob: 42f15bc1346b94edaf0ea1331c921d61098396d5 [file] [log] [blame]
/*
* Copyright (c) 2018 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT snps_designware_dma
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <drivers/dma.h>
#include <soc.h>
#include "dma_dw.h"
#define LOG_LEVEL CONFIG_DMA_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(dma_dw);
#define BYTE (1)
#define WORD (2)
#define DWORD (4)
/* CFG_LO */
#define DW_CFG_CLASS(x) (x << 29)
/* CFG_HI */
#define DW_CFGH_SRC_PER(x) ((x & 0xf) | ((x & 0x30) << 24))
#define DW_CFGH_DST_PER(x) (((x & 0xf) << 4) | ((x & 0x30) << 26))
/* default initial setup register values */
#define DW_CFG_LOW_DEF 0x0
#define DEV_NAME(dev) ((dev)->name)
#define DEV_DATA(dev) ((struct dw_dma_dev_data *const)(dev)->data)
#define DEV_CFG(dev) \
((const struct dw_dma_dev_cfg *const)(dev)->config)
/* number of tries to wait for reset */
#define DW_DMA_CFG_TRIES 10000
#define INT_MASK_ALL 0xFF00
static ALWAYS_INLINE void dw_write(uint32_t dma_base, uint32_t reg, uint32_t value)
{
*((volatile uint32_t*)(dma_base + reg)) = value;
}
static ALWAYS_INLINE uint32_t dw_read(uint32_t dma_base, uint32_t reg)
{
return *((volatile uint32_t*)(dma_base + reg));
}
static void dw_dma_isr(const struct device *dev)
{
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
struct dw_dma_dev_data *const dev_data = DEV_DATA(dev);
struct dma_chan_data *chan_data;
uint32_t status_tfr = 0U;
uint32_t status_block = 0U;
uint32_t status_err = 0U;
uint32_t status_intr;
uint32_t channel;
status_intr = dw_read(dev_cfg->base, DW_INTR_STATUS);
if (!status_intr) {
LOG_ERR("status_intr = %d", status_intr);
}
/* get the source of our IRQ. */
status_block = dw_read(dev_cfg->base, DW_STATUS_BLOCK);
status_tfr = dw_read(dev_cfg->base, DW_STATUS_TFR);
/* TODO: handle errors, just clear them atm */
status_err = dw_read(dev_cfg->base, DW_STATUS_ERR);
if (status_err) {
LOG_ERR("status_err = %d\n", status_err);
dw_write(dev_cfg->base, DW_CLEAR_ERR, status_err);
}
/* clear interrupts */
dw_write(dev_cfg->base, DW_CLEAR_BLOCK, status_block);
dw_write(dev_cfg->base, DW_CLEAR_TFR, status_tfr);
/* Dispatch callbacks for channels depending upon the bit set */
while (status_block) {
channel = find_lsb_set(status_block) - 1;
status_block &= ~(1 << channel);
chan_data = &dev_data->chan[channel];
if (chan_data->dma_blkcallback) {
/* Ensure the linked list (chan_data->lli) is
* freed in the user callback function once
* all the blocks are transferred.
*/
chan_data->dma_blkcallback(dev,
chan_data->blkuser_data,
channel, 0);
}
}
while (status_tfr) {
channel = find_lsb_set(status_tfr) - 1;
status_tfr &= ~(1 << channel);
chan_data = &dev_data->chan[channel];
if (chan_data->dma_tfrcallback) {
chan_data->dma_tfrcallback(dev,
chan_data->tfruser_data,
channel, 0);
}
}
}
static int dw_dma_config(const struct device *dev, uint32_t channel,
struct dma_config *cfg)
{
struct dw_dma_dev_data *const dev_data = DEV_DATA(dev);
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
struct dma_chan_data *chan_data;
struct dma_block_config *cfg_blocks;
uint32_t m_size;
uint32_t tr_width;
uint32_t ctrl_lo;
if (channel >= DW_MAX_CHAN) {
return -EINVAL;
}
__ASSERT_NO_MSG(cfg->source_data_size == cfg->dest_data_size);
__ASSERT_NO_MSG(cfg->source_burst_length == cfg->dest_burst_length);
if (cfg->source_data_size != BYTE && cfg->source_data_size != WORD &&
cfg->source_data_size != DWORD) {
LOG_ERR("Invalid 'source_data_size' value");
return -EINVAL;
}
cfg_blocks = cfg->head_block;
if ((cfg_blocks->next_block) || (cfg->block_count > 1)) {
/*
* return error since the application may have allocated
* memory for the buffers that may be lost when the DMA
* driver discards the buffers provided in the linked blocks
*/
LOG_ERR("block_count > 1 not supported");
return -EINVAL;
}
chan_data = &dev_data->chan[channel];
/* default channel config */
chan_data->direction = cfg->channel_direction;
/* data_size = (2 ^ tr_width) */
tr_width = find_msb_set(cfg->source_data_size) - 1;
LOG_DBG("Ch%u: tr_width=%d", channel, tr_width);
/* burst_size = (2 ^ msize) */
m_size = find_msb_set(cfg->source_burst_length) - 1;
LOG_DBG("Ch%u: m_size=%d", channel, m_size);
ctrl_lo = DW_CTLL_SRC_WIDTH(tr_width) | DW_CTLL_DST_WIDTH(tr_width);
ctrl_lo |= DW_CTLL_SRC_MSIZE(m_size) | DW_CTLL_DST_MSIZE(m_size);
/* enable interrupt */
ctrl_lo |= DW_CTLL_INT_EN;
switch (cfg->channel_direction) {
case MEMORY_TO_MEMORY:
ctrl_lo |= DW_CTLL_FC_M2M;
ctrl_lo |= DW_CTLL_SRC_INC | DW_CTLL_DST_INC;
break;
case MEMORY_TO_PERIPHERAL:
ctrl_lo |= DW_CTLL_FC_M2P;
ctrl_lo |= DW_CTLL_SRC_INC | DW_CTLL_DST_FIX;
/* Assign a hardware handshaking interface (0-15) to the
* destination of channel
*/
dw_write(dev_cfg->base, DW_CFG_HIGH(channel),
DW_CFGH_DST_PER(cfg->dma_slot));
break;
case PERIPHERAL_TO_MEMORY:
ctrl_lo |= DW_CTLL_FC_P2M;
ctrl_lo |= DW_CTLL_SRC_FIX | DW_CTLL_DST_INC;
/* Assign a hardware handshaking interface (0-15) to the
* source of channel
*/
dw_write(dev_cfg->base, DW_CFG_HIGH(channel),
DW_CFGH_SRC_PER(cfg->dma_slot));
break;
default:
LOG_ERR("channel_direction %d is not supported",
cfg->channel_direction);
return -EINVAL;
}
/* channel needs started from scratch, so write SARn, DARn */
dw_write(dev_cfg->base, DW_SAR(channel), cfg_blocks->source_address);
dw_write(dev_cfg->base, DW_DAR(channel), cfg_blocks->dest_address);
/* Configure a callback appropriately depending on whether the
* interrupt is requested at the end of transaction completion or
* at the end of each block.
*/
if (cfg->complete_callback_en) {
chan_data->dma_blkcallback = cfg->dma_callback;
chan_data->blkuser_data = cfg->user_data;
dw_write(dev_cfg->base, DW_MASK_BLOCK, INT_UNMASK(channel));
} else {
chan_data->dma_tfrcallback = cfg->dma_callback;
chan_data->tfruser_data = cfg->user_data;
dw_write(dev_cfg->base, DW_MASK_TFR, INT_UNMASK(channel));
}
dw_write(dev_cfg->base, DW_MASK_ERR, INT_UNMASK(channel));
/* write interrupt clear registers for the channel
* ClearTfr, ClearBlock, ClearSrcTran, ClearDstTran, ClearErr
*/
dw_write(dev_cfg->base, DW_CLEAR_TFR, 0x1 << channel);
dw_write(dev_cfg->base, DW_CLEAR_BLOCK, 0x1 << channel);
dw_write(dev_cfg->base, DW_CLEAR_SRC_TRAN, 0x1 << channel);
dw_write(dev_cfg->base, DW_CLEAR_DST_TRAN, 0x1 << channel);
dw_write(dev_cfg->base, DW_CLEAR_ERR, 0x1 << channel);
/* single transfer, must set zero */
dw_write(dev_cfg->base, DW_LLP(channel), 0);
/* program CTLn */
dw_write(dev_cfg->base, DW_CTRL_LOW(channel), ctrl_lo);
dw_write(dev_cfg->base, DW_CTRL_HIGH(channel),
DW_CFG_CLASS(dev_data->channel_data->chan[channel].class) |
cfg_blocks->block_size);
/* write channel config */
dw_write(dev_cfg->base, DW_CFG_LOW(channel), DW_CFG_LOW_DEF);
return 0;
}
static int dw_dma_reload(const struct device *dev, uint32_t channel,
uint32_t src, uint32_t dst, size_t size)
{
struct dw_dma_dev_data *const dev_data = DEV_DATA(dev);
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
if (channel >= DW_MAX_CHAN) {
return -EINVAL;
}
dw_write(dev_cfg->base, DW_SAR(channel), src);
dw_write(dev_cfg->base, DW_DAR(channel), dst);
dw_write(dev_cfg->base, DW_CTRL_HIGH(channel),
DW_CFG_CLASS(dev_data->channel_data->chan[channel].class) |
size);
return 0;
}
static int dw_dma_transfer_start(const struct device *dev, uint32_t channel)
{
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
if (channel >= DW_MAX_CHAN) {
return -EINVAL;
}
/* enable the channel */
dw_write(dev_cfg->base, DW_DMA_CHAN_EN, CHAN_ENABLE(channel));
return 0;
}
static int dw_dma_transfer_stop(const struct device *dev, uint32_t channel)
{
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
if (channel >= DW_MAX_CHAN) {
return -EINVAL;
}
/* disable the channel */
dw_write(dev_cfg->base, DW_DMA_CHAN_EN, CHAN_DISABLE(channel));
return 0;
}
static void dw_dma_setup(const struct device *dev)
{
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
struct dw_dma_dev_data *const dev_data = DEV_DATA(dev);
struct dw_drv_plat_data *dp = dev_data->channel_data;
int i;
/* we cannot config DMAC if DMAC has been already enabled by host */
if (dw_read(dev_cfg->base, DW_DMA_CFG) != 0) {
dw_write(dev_cfg->base, DW_DMA_CFG, 0x0);
}
/* now check that it's 0 */
for (i = DW_DMA_CFG_TRIES; i > 0; i--) {
if (dw_read(dev_cfg->base, DW_DMA_CFG) == 0) {
goto found;
}
}
LOG_ERR("DW_DMA_CFG is non-zero\n");
return;
found:
for (i = 0; i < DW_MAX_CHAN; i++) {
dw_read(dev_cfg->base, DW_DMA_CHAN_EN);
}
/* enable the DMA controller */
dw_write(dev_cfg->base, DW_DMA_CFG, 1);
/* mask all interrupts for all 8 channels */
dw_write(dev_cfg->base, DW_MASK_TFR, INT_MASK_ALL);
dw_write(dev_cfg->base, DW_MASK_BLOCK, INT_MASK_ALL);
dw_write(dev_cfg->base, DW_MASK_SRC_TRAN, INT_MASK_ALL);
dw_write(dev_cfg->base, DW_MASK_DST_TRAN, INT_MASK_ALL);
dw_write(dev_cfg->base, DW_MASK_ERR, INT_MASK_ALL);
/* set channel priorities */
for (i = 0; i < DW_MAX_CHAN; i++) {
dw_write(dev_cfg->base, DW_CTRL_HIGH(i),
DW_CFG_CLASS(dp->chan[i].class));
}
}
static int dw_dma_init(const struct device *dev)
{
const struct dw_dma_dev_cfg *const dev_cfg = DEV_CFG(dev);
/* Disable all channels and Channel interrupts */
dw_dma_setup(dev);
/* Configure interrupts */
dev_cfg->irq_config();
LOG_INF("Device %s initialized", DEV_NAME(dev));
return 0;
}
static const struct dma_driver_api dw_dma_driver_api = {
.config = dw_dma_config,
.reload = dw_dma_reload,
.start = dw_dma_transfer_start,
.stop = dw_dma_transfer_stop,
};
#define DW_DMAC_INIT(inst) \
\
DEVICE_DECLARE(dw_dma##inst); \
\
static struct dw_drv_plat_data dmac##inst = { \
.chan[0] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[1] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[2] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[3] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[4] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[5] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[6] = { \
.class = 6, \
.weight = 0, \
}, \
.chan[7] = { \
.class = 6, \
.weight = 0, \
}, \
}; \
\
static void dw_dma##inst##_irq_config(void); \
\
static const struct dw_dma_dev_cfg dw_dma##inst##_config = { \
.base = DT_INST_REG_ADDR(inst), \
.irq_config = dw_dma##inst##_irq_config \
}; \
\
static struct dw_dma_dev_data dw_dma##inst##_data = { \
.channel_data = &dmac##inst, \
}; \
\
DEVICE_AND_API_INIT(dw_dma##inst, DT_INST_LABEL(inst), \
&dw_dma_init, \
&dw_dma##inst##_data, \
&dw_dma##inst##_config, POST_KERNEL, \
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
&dw_dma_driver_api); \
\
static void dw_dma##inst##_irq_config(void) \
{ \
IRQ_CONNECT(DT_INST_IRQN(inst), \
DT_INST_IRQ(inst, priority), dw_dma_isr, \
DEVICE_GET(dw_dma##inst), \
DT_INST_IRQ(inst, sense)); \
irq_enable(DT_INST_IRQN(inst)); \
}
DT_INST_FOREACH_STATUS_OKAY(DW_DMAC_INIT)