/**
* hsi_unpoll - HSI poll feature, disables data interrupt on frame reception
* @dev - hsi device channel reference to apply the I/O control
* (or port associated to it)
*
* Return 0 on success, a negative value on failure.
*
*/
int hsi_unpoll(struct hsi_device *dev)
{
struct hsi_channel *ch;
struct hsi_dev *hsi_ctrl;
if (unlikely(!dev || !dev->ch))
return -EINVAL;
dev_dbg(dev->device.parent, "%s ch %d\n", __func__, dev->n_ch);
if (unlikely(!(dev->ch->flags & HSI_CH_OPEN))) {
dev_err(dev->device.parent, "HSI device NOT open\n");
return -EINVAL;
}
ch = dev->ch;
hsi_ctrl = ch->hsi_port->hsi_controller;
spin_lock_bh(&hsi_ctrl->lock);
hsi_clocks_enable_channel(hsi_ctrl->dev, dev->ch->channel_number,
__func__);
ch->flags &= ~HSI_CH_RX_POLL;
hsi_driver_disable_read_interrupt(ch);
hsi_clocks_disable_channel(hsi_ctrl->dev, dev->ch->channel_number,
__func__);
spin_unlock_bh(&hsi_ctrl->lock);
return 0;
}
/**
* hsi_close - close given hsi device channel
* @dev - reference to hsi device channel.
*/
void hsi_close(struct hsi_device *dev)
{
struct hsi_dev *hsi_ctrl;
if (!dev || !dev->ch) {
pr_err(LOG_NAME "Trying to close wrong HSI device %p\n", dev);
return;
}
dev_dbg(dev->device.parent, "%s ch %d\n", __func__, dev->n_ch);
hsi_ctrl = dev->ch->hsi_port->hsi_controller;
spin_lock_bh(&hsi_ctrl->lock);
hsi_clocks_enable_channel(hsi_ctrl->dev, dev->ch->channel_number,
__func__);
if (dev->ch->flags & HSI_CH_OPEN) {
dev->ch->flags &= ~HSI_CH_OPEN;
__hsi_write_cancel(dev->ch);
__hsi_read_cancel(dev->ch);
}
if (dev->ch->flags & HSI_CH_RX_POLL) {
/* Disable RX interrupt for polling */
dev->ch->flags &= ~HSI_CH_RX_POLL;
hsi_driver_disable_read_interrupt(dev->ch);
}
hsi_clocks_disable_channel(hsi_ctrl->dev, dev->ch->channel_number,
__func__);
spin_unlock_bh(&hsi_ctrl->lock);
}
/* HSR_AVAILABLE interrupt processing */
static void hsi_do_channel_rx(struct hsi_channel *ch)
{
struct hsi_dev *hsi_ctrl = ch->hsi_port->hsi_controller;
void __iomem *base = ch->hsi_port->hsi_controller->base;
unsigned int n_ch;
unsigned int n_p;
unsigned int irq;
long buff_offset;
int rx_poll = 0;
int data_read = 0;
int fifo, fifo_words_avail;
n_ch = ch->channel_number;
n_p = ch->hsi_port->port_number;
irq = ch->hsi_port->n_irq;
dev_dbg(hsi_ctrl->dev,
"Data Available interrupt for channel %d.\n", n_ch);
/* Check if there is data in FIFO available for reading */
if (hsi_driver_device_is_hsi(to_platform_device(hsi_ctrl->dev))) {
fifo = hsi_fifo_get_id(hsi_ctrl, n_ch, n_p);
if (unlikely(fifo < 0)) {
dev_err(hsi_ctrl->dev, "No valid FIFO id found for "
"channel %d.\n", n_ch);
return;
}
fifo_words_avail = hsi_get_rx_fifo_occupancy(hsi_ctrl, fifo);
if (!fifo_words_avail) {
dev_dbg(hsi_ctrl->dev,
"WARNING: RX FIFO %d empty before CPU copy\n",
fifo);
/* Do not disable interrupt becaue another interrupt */
/* can still come, this time with a real frame. */
return;
}
}
/* Disable interrupts if not needed for polling */
if (!(ch->flags & HSI_CH_RX_POLL))
hsi_driver_disable_read_interrupt(ch);
/*
* Check race condition: RX transmission initiated but DMA transmission
* already started - acknowledge then ignore interrupt occurence
*/
if (ch->read_data.lch != -1) {
dev_warn(hsi_ctrl->dev,
"Race condition between RX Int ch %d and DMA %0x\n",
n_ch, ch->read_data.lch);
goto done;
}
if (ch->flags & HSI_CH_RX_POLL)
rx_poll = 1;
if (ch->read_data.addr) {
buff_offset = hsi_hsr_buffer_reg(hsi_ctrl, n_p, n_ch);
if (buff_offset >= 0) {
data_read = 1;
*(ch->read_data.addr) = hsi_inl(base, buff_offset);
}
}
hsi_reset_ch_read(ch);
done:
if (rx_poll) {
spin_unlock(&hsi_ctrl->lock);
hsi_port_event_handler(ch->hsi_port,
HSI_EVENT_HSR_DATAAVAILABLE,
(void *)n_ch);
spin_lock(&hsi_ctrl->lock);
}
if (data_read) {
spin_unlock(&hsi_ctrl->lock);
dev_dbg(hsi_ctrl->dev, "Calling ch %d read callback.\n", n_ch);
(*ch->read_done) (ch->dev, 1);
spin_lock(&hsi_ctrl->lock);
}
}
/**
* hsi_driver_read_dma - Program GDD [DMA] to write data to memory from
* the hsi channel buffer.
* @hsi_channel - pointer to the hsi_channel to read data from.
* @data - 32-bit word pointer where to store the incoming data.
* @size - Number of 32bit words to be transfered to the buffer.
*
* hsi_controller lock must be held before calling this function.
*
* Return 0 on success and < 0 on error.
*/
int hsi_driver_read_dma(struct hsi_channel *hsi_channel, u32 * data,
unsigned int count)
{
struct hsi_dev *hsi_ctrl = hsi_channel->hsi_port->hsi_controller;
void __iomem *base = hsi_ctrl->base;
unsigned int port = hsi_channel->hsi_port->port_number;
unsigned int channel = hsi_channel->channel_number;
unsigned int sync;
int lch;
dma_addr_t src_addr;
dma_addr_t dest_addr;
u16 tmp;
int fifo;
lch = hsi_get_free_lch(hsi_ctrl);
if (lch < 0) {
dev_err(hsi_ctrl->dev, "No free DMA channels.\n");
return -EBUSY; /* No free GDD logical channels. */
} else {
dev_dbg(hsi_ctrl->dev, "Allocated DMA channel %d for read on"
" HSI channel %d.\n", lch,
hsi_channel->channel_number);
}
/* When DMA is used for Rx, disable the Rx Interrupt.
* (else DATAAVAILLABLE event would get triggered on first
* received data word)
* (Rx interrupt might be active for polling feature)
*/
hsi_driver_disable_read_interrupt(hsi_channel);
/*
* NOTE: Gettting a free gdd logical channel and
* reserve it must be done atomicaly.
*/
hsi_channel->read_data.lch = lch;
/* Sync is required for SSI but not for HSI */
sync = hsi_sync_table[HSI_SYNC_READ][port - 1][channel];
dest_addr = dma_map_single(hsi_ctrl->dev, data, count * 4,
DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(hsi_ctrl->dev, dest_addr))) {
dev_err(hsi_ctrl->dev, "Failed to create DMA read mapping.\n");
return -ENOMEM;
}
tmp = HSI_DST_BURST_4x32_BIT |
HSI_DST_MEMORY_PORT |
HSI_SRC_BURST_4x32_BIT |
HSI_SRC_PERIPHERAL_PORT | HSI_DATA_TYPE_S32;
hsi_outw(tmp, base, HSI_GDD_CSDP_REG(lch));
tmp = HSI_DST_AMODE_POSTINC | HSI_SRC_AMODE_CONST | sync;
hsi_outw(tmp, base, HSI_GDD_CCR_REG(lch));
hsi_outw((HSI_BLOCK_IE | HSI_TOUT_IE), base, HSI_GDD_CCIR_REG(lch));
if (hsi_driver_device_is_hsi(to_platform_device(hsi_ctrl->dev))) {
fifo = hsi_fifo_get_id(hsi_ctrl, channel, port);
if (unlikely(fifo < 0)) {
dev_err(hsi_ctrl->dev, "No valid FIFO id for DMA "
"transfer from FIFO.\n");
return -EFAULT;
}
/* HSI CSSA register takes a FIFO ID when copying from FIFO */
hsi_outl(fifo, base, HSI_GDD_CSSA_REG(lch));
} else{
src_addr = hsi_ctrl->phy_base + HSI_HSR_BUFFER_CH_REG(port,
channel);
/* SSI CSSA register always takes a 32-bit address */
hsi_outl(src_addr, base, HSI_GDD_CSSA_REG(lch));
}
/* HSI CDSA register takes a 32-bit address when copying to memory */
/* SSI CDSA register always takes a 32-bit address */
hsi_outl(dest_addr, base, HSI_GDD_CDSA_REG(lch));
hsi_outw(count, base, HSI_GDD_CEN_REG(lch));
/* TODO : Need to clean interrupt status here to avoid spurious int */
hsi_outl_or(HSI_GDD_LCH(lch), base, HSI_SYS_GDD_MPU_IRQ_ENABLE_REG);
hsi_outw_or(HSI_CCR_ENABLE, base, HSI_GDD_CCR_REG(lch));
return 0;
}