/**
* hsi_softreset - Force a SW RESET of HSI (core + DMA)
*
* @hsi_ctrl - reference to the hsi controller to be reset.
*
*/
int hsi_softreset(struct hsi_dev *hsi_ctrl)
{
unsigned int ind = 0;
unsigned int port;
void __iomem *base = hsi_ctrl->base;
u32 status;
/* HSI-C1BUG00088: i696 : HSI: Issue with SW reset
* No recovery from SW reset under specific circumstances
* If a SW RESET is done while some HSI errors are still not
* acknowledged, the HSR FSM is stucked. */
if (is_hsi_errata(hsi_ctrl, HSI_ERRATUM_i696_SW_RESET_FSM_STUCK)) {
for (port = 1; port <= hsi_ctrl->max_p; port++) {
hsi_outl_and(HSI_HSR_MODE_MODE_VAL_SLEEP, base,
HSI_HSR_MODE_REG(port));
hsi_outl(HSI_HSR_ERROR_ALL, base,
HSI_HSR_ERRORACK_REG(port));
}
}
/* Reseting HSI Block */
hsi_outl_or(HSI_SOFTRESET, base, HSI_SYS_SYSCONFIG_REG);
do {
status = hsi_inl(base, HSI_SYS_SYSSTATUS_REG);
ind++;
} while ((!(status & HSI_RESETDONE)) &&
(ind < HSI_RESETDONE_MAX_RETRIES));
if (ind >= HSI_RESETDONE_MAX_RETRIES) {
dev_err(hsi_ctrl->dev, "HSI SW_RESET failed to complete within"
" %d retries.\n", HSI_RESETDONE_MAX_RETRIES);
return -EIO;
} else if (ind > HSI_RESETDONE_NORMAL_RETRIES) {
dev_warn(hsi_ctrl->dev, "HSI SW_RESET abnormally long:"
" %d retries to complete.\n", ind);
}
ind = 0;
/* Reseting DMA Engine */
hsi_outl_or(HSI_GDD_GRST_SWRESET, base, HSI_GDD_GRST_REG);
do {
status = hsi_inl(base, HSI_GDD_GRST_REG);
ind++;
} while ((status & HSI_GDD_GRST_SWRESET) &&
(ind < HSI_RESETDONE_MAX_RETRIES));
if (ind >= HSI_RESETDONE_MAX_RETRIES) {
dev_err(hsi_ctrl->dev, "HSI DMA SW_RESET failed to complete"
" within %d retries.\n", HSI_RESETDONE_MAX_RETRIES);
return -EIO;
}
if (ind > HSI_RESETDONE_NORMAL_RETRIES) {
dev_warn(hsi_ctrl->dev, "HSI DMA SW_RESET abnormally long:"
" %d retries to complete.\n", ind);
}
return 0;
}
/**
* hsi_softreset - Force a SW RESET of HSI (core + DMA)
*
* @hsi_ctrl - reference to the hsi controller to be reset.
*
*/
int hsi_softreset(struct hsi_dev *hsi_ctrl)
{
unsigned int ind = 0;
unsigned int port;
void __iomem *base = hsi_ctrl->base;
u32 status;
/* SW WA for HSI-C1BUG00088 OMAP4430 HSI : No recovery from SW reset */
/* under specific circumstances */
for (port = 1; port <= hsi_ctrl->max_p; port++) {
hsi_outl_and(HSI_HSR_MODE_MODE_VAL_SLEEP, base,
HSI_HSR_MODE_REG(port));
hsi_outl(HSI_HSR_ERROR_ALL, base, HSI_HSR_ERRORACK_REG(port));
}
/* Reseting HSI Block */
hsi_outl_or(HSI_SOFTRESET, base, HSI_SYS_SYSCONFIG_REG);
do {
status = hsi_inl(base, HSI_SYS_SYSSTATUS_REG);
ind++;
} while ((!(status & HSI_RESETDONE)) &&
(ind < HSI_RESETDONE_MAX_RETRIES));
if (ind >= HSI_RESETDONE_MAX_RETRIES) {
dev_err(hsi_ctrl->dev, "HSI SW_RESET failed to complete within"
" %d retries.\n", HSI_RESETDONE_MAX_RETRIES);
return -EIO;
} else if (ind > HSI_RESETDONE_NORMAL_RETRIES) {
dev_warn(hsi_ctrl->dev, "HSI SW_RESET abnormally long:"
" %d retries to complete.\n", ind);
}
ind = 0;
/* Reseting DMA Engine */
hsi_outl_or(HSI_GDD_GRST_SWRESET, base, HSI_GDD_GRST_REG);
do {
status = hsi_inl(base, HSI_GDD_GRST_REG);
ind++;
} while ((status & HSI_GDD_GRST_SWRESET) &&
(ind < HSI_RESETDONE_MAX_RETRIES));
if (ind >= HSI_RESETDONE_MAX_RETRIES) {
dev_err(hsi_ctrl->dev, "HSI DMA SW_RESET failed to complete"
" within %d retries.\n", HSI_RESETDONE_MAX_RETRIES);
return -EIO;
}
if (ind > HSI_RESETDONE_NORMAL_RETRIES) {
dev_warn(hsi_ctrl->dev, "HSI DMA SW_RESET abnormally long:"
" %d retries to complete.\n", ind);
}
return 0;
}
/* Enables the CAWAKE, BREAK, or ERROR interrupt for the given port
*
* Since these 3 interrupts ENABLE and STATUS bits are duplicated in both
* HSI_Pp_M_IRQr_xxx(channels [0..7]) and HSI_Pp_M_IRQrU_xxx(channels [8..15]),
* for convenience we always enable the interrupts for channels [0..7].
*
* BREAK and ERROR interrupts in HSI_Pp_M_IRQrU_xxx are not used.
* CAWAKE interrupt in HSI_Pp_M_IRQrU_xxx is used as a backup interrupt to be
* sure we don't miss a CAWAKE interrupt while clearing the previous one.
*/
int hsi_driver_enable_interrupt(struct hsi_port *pport, u32 flag)
{
hsi_outl_or(flag, pport->hsi_controller->base,
HSI_SYS_MPU_ENABLE_REG(pport->port_number, pport->n_irq));
return 0;
}
int hsi_softreset(struct hsi_dev *hsi_ctrl)
{
unsigned int ind = 0;
void __iomem *base = hsi_ctrl->base;
u32 status;
/* Reseting HSI Block */
hsi_outl_or(HSI_SOFTRESET, base, HSI_SYS_SYSCONFIG_REG);
do {
status = hsi_inl(base, HSI_SYS_SYSSTATUS_REG);
ind++;
} while ((!(status & HSI_RESETDONE)) &&
(ind < HSI_RESETDONE_MAX_RETRIES));
if (ind >= HSI_RESETDONE_MAX_RETRIES) {
dev_err(hsi_ctrl->dev, "HSI SW_RESET failed to complete within"
" %d retries.\n", HSI_RESETDONE_MAX_RETRIES);
return -EIO;
} else if (ind > HSI_RESETDONE_NORMAL_RETRIES) {
dev_warn(hsi_ctrl->dev, "HSI SW_RESET abnormally long:"
" %d retries to complete.\n", ind);
}
ind = 0;
/* Reseting DMA Engine */
hsi_outl_or(HSI_GDD_GRST_SWRESET, base, HSI_GDD_GRST_REG);
do {
status = hsi_inl(base, HSI_GDD_GRST_REG);
ind++;
} while ((status & HSI_GDD_GRST_SWRESET) &&
(ind < HSI_RESETDONE_MAX_RETRIES));
if (ind >= HSI_RESETDONE_MAX_RETRIES) {
dev_err(hsi_ctrl->dev, "HSI DMA SW_RESET failed to complete"
" within %d retries.\n", HSI_RESETDONE_MAX_RETRIES);
return -EIO;
}
if (ind > HSI_RESETDONE_NORMAL_RETRIES) {
dev_warn(hsi_ctrl->dev, "HSI DMA SW_RESET abnormally long:"
" %d retries to complete.\n", ind);
}
return 0;
}
/* Enables the Data Available Interrupt of HSR for the given channel */
int hsi_driver_enable_read_interrupt(struct hsi_channel *ch, u32 * data)
{
struct hsi_port *p = ch->hsi_port;
unsigned int port = p->port_number;
unsigned int channel = ch->channel_number;
hsi_outl_or(HSI_HSR_DATAAVAILABLE(channel), p->hsi_controller->base,
HSI_SYS_MPU_ENABLE_CH_REG(port, p->n_irq, channel));
return 0;
}
static int __init hsi_softreset(struct hsi_dev *hsi_ctrl)
{
int ind = 0;
void __iomem *base = hsi_ctrl->base;
u32 status;
hsi_outl_or(HSI_SOFTRESET, base, HSI_SYS_SYSCONFIG_REG);
do {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(msecs_to_jiffies(HSI_RESETDONE_TIMEOUT));
status = hsi_inl(base, HSI_SYS_SYSSTATUS_REG);
ind++;
} while ((!(status & HSI_RESETDONE)) && (ind < HSI_RESETDONE_RETRIES));
if (ind >= HSI_RESETDONE_RETRIES)
return -EIO;
/* Reseting GDD */
hsi_outl_or(HSI_SWRESET, base, HSI_GDD_GRST_REG);
return 0;
}
/**
* hsi_ioctl - HSI I/O control
* @dev - hsi device channel reference to apply the I/O control
* (or port associated to it)
* @command - HSI I/O control command
* @arg - parameter associated to the control command. NULL, if no parameter.
*
* Return 0 on success, a negative value on failure.
*
*/
int hsi_ioctl(struct hsi_device *dev, unsigned int command, void *arg)
{
struct hsi_channel *ch;
struct hsi_dev *hsi_ctrl;
struct hsi_port *pport;
void __iomem *base;
unsigned int port, channel;
u32 acwake;
int err = 0;
int fifo = 0;
u8 ret;
struct hsi_platform_data *pdata;
if (unlikely((!dev) ||
(!dev->ch) ||
(!dev->ch->hsi_port) ||
(!dev->ch->hsi_port->hsi_controller)) ||
(!(dev->ch->flags & HSI_CH_OPEN))) {
pr_err(LOG_NAME "HSI IOCTL Invalid parameter\n");
return -EINVAL;
}
ch = dev->ch;
pport = ch->hsi_port;
hsi_ctrl = ch->hsi_port->hsi_controller;
port = ch->hsi_port->port_number;
channel = ch->channel_number;
base = hsi_ctrl->base;
dev_dbg(hsi_ctrl->dev, "IOCTL: ch %d, command %d\n", channel, command);
spin_lock_bh(&hsi_ctrl->lock);
hsi_clocks_enable_channel(hsi_ctrl->dev, channel, __func__);
switch (command) {
case HSI_IOCTL_ACWAKE_UP:
/* Wake up request to Modem (typically OMAP initiated) */
/* Symetrical disable will be done in HSI_IOCTL_ACWAKE_DOWN */
if (ch->flags & HSI_CH_ACWAKE) {
dev_dbg(hsi_ctrl->dev, "Duplicate ACWAKE UP\n");
err = -EPERM;
goto out;
}
ch->flags |= HSI_CH_ACWAKE;
pport->acwake_status |= BIT(channel);
/* We only claim once the wake line per channel */
acwake = hsi_inl(base, HSI_SYS_WAKE_REG(port));
if (!(acwake & HSI_WAKE(channel))) {
hsi_outl(HSI_SET_WAKE(channel), base,
HSI_SYS_SET_WAKE_REG(port));
}
goto out;
break;
case HSI_IOCTL_ACWAKE_DOWN:
/* Low power request initiation (OMAP initiated, typically */
/* following inactivity timeout) */
/* ACPU HSI block shall still be capable of receiving */
if (!(ch->flags & HSI_CH_ACWAKE)) {
dev_dbg(hsi_ctrl->dev, "Duplicate ACWAKE DOWN\n");
err = -EPERM;
goto out;
}
acwake = hsi_inl(base, HSI_SYS_WAKE_REG(port));
if (unlikely(pport->acwake_status !=
(acwake & HSI_WAKE_MASK))) {
dev_warn(hsi_ctrl->dev,
"ACWAKE shadow register mismatch"
" acwake_status: 0x%x, HSI_SYS_WAKE_REG: 0x%x",
pport->acwake_status, acwake);
pport->acwake_status = acwake & HSI_WAKE_MASK;
}
/* SSI_TODO: add safety check for SSI also */
ch->flags &= ~HSI_CH_ACWAKE;
pport->acwake_status &= ~BIT(channel);
/* Release the wake line per channel */
if ((acwake & HSI_WAKE(channel))) {
hsi_outl(HSI_CLEAR_WAKE(channel), base,
HSI_SYS_CLEAR_WAKE_REG(port));
}
goto out;
break;
case HSI_IOCTL_SEND_BREAK:
hsi_outl(1, base, HSI_HST_BREAK_REG(port));
/*HSI_TODO : need to deactivate clock after BREAK frames sent*/
/*Use interrupt ? (if TX BREAK INT exists)*/
break;
case HSI_IOCTL_GET_ACWAKE:
if (!arg) {
err = -EINVAL;
goto out;
}
*(u32 *)arg = hsi_inl(base, HSI_SYS_WAKE_REG(port));
break;
case HSI_IOCTL_FLUSH_RX:
ret = hsi_hsr_fifo_flush_channel(hsi_ctrl, port, channel);
if (arg)
*(size_t *)arg = ret;
/* Ack the RX Int */
hsi_outl_and(~HSI_HSR_DATAAVAILABLE(channel), base,
HSI_SYS_MPU_STATUS_CH_REG(port, pport->n_irq,
channel));
break;
case HSI_IOCTL_FLUSH_TX:
ret = hsi_hst_fifo_flush_channel(hsi_ctrl, port, channel);
if (arg)
*(size_t *)arg = ret;
/* Ack the TX Int */
hsi_outl_and(~HSI_HST_DATAACCEPT(channel), base,
HSI_SYS_MPU_STATUS_CH_REG(port, pport->n_irq,
channel));
break;
case HSI_IOCTL_GET_CAWAKE:
if (!arg) {
err = -EINVAL;
goto out;
}
err = hsi_get_cawake(dev->ch->hsi_port);
if (err < 0) {
err = -ENODEV;
goto out;
}
*(u32 *)arg = err;
break;
case HSI_IOCTL_SET_RX:
if (!arg) {
err = -EINVAL;
goto out;
}
err = hsi_set_rx(dev->ch->hsi_port, (struct hsr_ctx *)arg);
break;
case HSI_IOCTL_GET_RX:
if (!arg) {
err = -EINVAL;
goto out;
}
hsi_get_rx(dev->ch->hsi_port, (struct hsr_ctx *)arg);
break;
case HSI_IOCTL_SET_TX:
if (!arg) {
err = -EINVAL;
goto out;
}
err = hsi_set_tx(dev->ch->hsi_port, (struct hst_ctx *)arg);
break;
case HSI_IOCTL_GET_TX:
if (!arg) {
err = -EINVAL;
goto out;
}
hsi_get_tx(dev->ch->hsi_port, (struct hst_ctx *)arg);
break;
case HSI_IOCTL_SW_RESET:
dev_info(hsi_ctrl->dev, "SW Reset\n");
err = hsi_softreset(hsi_ctrl);
/* Reset HSI config to default */
hsi_softreset_driver(hsi_ctrl);
break;
case HSI_IOCTL_GET_FIFO_OCCUPANCY:
if (!arg) {
err = -EINVAL;
goto out;
}
fifo = hsi_fifo_get_id(hsi_ctrl, channel, port);
if (unlikely(fifo < 0)) {
dev_err(hsi_ctrl->dev, "No valid FIFO id found for "
"channel %d.\n", channel);
err = -EFAULT;
goto out;
}
*(size_t *)arg = hsi_get_rx_fifo_occupancy(hsi_ctrl, fifo);
break;
case HSI_IOCTL_SET_WAKE_RX_3WIRES_MODE:
dev_info(hsi_ctrl->dev,
"Entering RX wakeup in 3 wires mode (no CAWAKE)\n");
pport->wake_rx_3_wires_mode = 1;
/* HSI-C1BUG00085: ixxx: HSI wakeup issue in 3 wires mode
* HSI will NOT generate the Swakeup for 2nd frame if it entered
* IDLE after 1st received frame */
if (is_hsi_errata(hsi_ctrl, HSI_ERRATUM_ixxx_3WIRES_NO_SWAKEUP))
if (hsi_driver_device_is_hsi(to_platform_device
(hsi_ctrl->dev)))
hsi_set_pm_force_hsi_on(hsi_ctrl);
/* When WAKE is not available, ACREADY must be set to 1 at
* reset else remote will never have a chance to transmit. */
hsi_outl_or(HSI_SET_WAKE_3_WIRES | HSI_SET_WAKE_READY_LVL_1,
base, HSI_SYS_SET_WAKE_REG(port));
hsi_driver_disable_interrupt(pport, HSI_CAWAKEDETECTED);
break;
case HSI_IOCTL_SET_WAKE_RX_4WIRES_MODE:
dev_info(hsi_ctrl->dev, "Entering RX wakeup in 4 wires mode\n");
pport->wake_rx_3_wires_mode = 0;
/* HSI-C1BUG00085: ixxx: HSI wakeup issue in 3 wires mode
* HSI will NOT generate the Swakeup for 2nd frame if it entered
* IDLE after 1st received frame */
if (is_hsi_errata(hsi_ctrl, HSI_ERRATUM_ixxx_3WIRES_NO_SWAKEUP))
if (hsi_driver_device_is_hsi(to_platform_device
(hsi_ctrl->dev)))
hsi_set_pm_default(hsi_ctrl);
hsi_driver_enable_interrupt(pport, HSI_CAWAKEDETECTED);
hsi_outl_and(HSI_SET_WAKE_3_WIRES_MASK, base,
HSI_SYS_SET_WAKE_REG(port));
break;
case HSI_IOCTL_SET_HI_SPEED:
if (!arg) {
err = -EINVAL;
goto out;
}
hsi_ctrl->hsi_fclk_req = *(unsigned int *)arg ?
HSI_FCLK_HI_SPEED : HSI_FCLK_LOW_SPEED;
if (hsi_ctrl->hsi_fclk_req == hsi_ctrl->hsi_fclk_current) {
dev_dbg(hsi_ctrl->dev, "HSI FClk already @%ldHz\n",
hsi_ctrl->hsi_fclk_current);
goto out;
}
if (hsi_is_controller_transfer_ongoing(hsi_ctrl)) {
err = -EBUSY;
goto out;
}
hsi_ctrl->clock_change_ongoing = true;
spin_unlock_bh(&hsi_ctrl->lock);
pdata = dev_get_platdata(hsi_ctrl->dev);
/* Set the HSI FCLK to requested value. */
err = pdata->device_scale(hsi_ctrl->dev, hsi_ctrl->dev,
hsi_ctrl->hsi_fclk_req);
if (err < 0) {
dev_err(hsi_ctrl->dev, "%s: Cannot set HSI FClk to"
" %ldHz, err %d\n", __func__,
hsi_ctrl->hsi_fclk_req, err);
} else {
dev_info(hsi_ctrl->dev, "HSI FClk changed from %ldHz to"
" %ldHz\n", hsi_ctrl->hsi_fclk_current,
hsi_ctrl->hsi_fclk_req);
hsi_ctrl->hsi_fclk_current = hsi_ctrl->hsi_fclk_req;
}
spin_lock_bh(&hsi_ctrl->lock);
hsi_ctrl->clock_change_ongoing = false;
break;
case HSI_IOCTL_GET_SPEED:
if (!arg) {
err = -EINVAL;
goto out;
}
*(unsigned long *)arg = hsi_ctrl->hsi_fclk_current;
break;
default:
err = -ENOIOCTLCMD;
break;
}
out:
/* All IOCTL end by disabling the clocks, except ACWAKE high. */
hsi_clocks_disable_channel(hsi_ctrl->dev, channel, __func__);
spin_unlock_bh(&hsi_ctrl->lock);
return err;
}
/**
* 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;
}
/**
* hsi_driver_write_dma - Program GDD [DMA] to write data from memory to
* the hsi channel buffer.
* @hsi_channel - pointer to the hsi_channel to write data to.
* @data - 32-bit word pointer to the data.
* @size - Number of 32bit words to be transfered.
*
* hsi_controller lock must be held before calling this function.
*
* Return 0 on success and < 0 on error.
*/
int hsi_driver_write_dma(struct hsi_channel *hsi_channel, u32 * data,
unsigned int size)
{
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;
if ((size < 1) || (data == NULL))
return -EINVAL;
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 write on"
" HSI channel %d.\n", lch,
hsi_channel->channel_number);
}
/* NOTE: Getting a free gdd logical channel and
* reserve it must be done atomicaly. */
hsi_channel->write_data.lch = lch;
/* Sync is required for SSI but not for HSI */
sync = hsi_sync_table[HSI_SYNC_WRITE][port - 1][channel];
src_addr = dma_map_single(hsi_ctrl->dev, data, size * 4, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(hsi_ctrl->dev, src_addr))) {
dev_err(hsi_ctrl->dev, "Failed to create DMA write mapping.\n");
return -ENOMEM;
}
tmp = HSI_SRC_BURST_4x32_BIT|
HSI_SRC_MEMORY_PORT |
HSI_DST_BURST_4x32_BIT |
HSI_DST_PERIPHERAL_PORT | HSI_DATA_TYPE_S32;
hsi_outw(tmp, base, HSI_GDD_CSDP_REG(lch));
tmp = HSI_SRC_AMODE_POSTINC | HSI_DST_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 to FIFO.\n");
return -EFAULT;
}
/* HSI CDSA register takes a FIFO ID when copying to FIFO */
hsi_outl(fifo, base, HSI_GDD_CDSA_REG(lch));
} else {
dest_addr = hsi_ctrl->phy_base + HSI_HST_BUFFER_CH_REG(port,
channel);
/* SSI CDSA register always takes a 32-bit address */
hsi_outl(dest_addr, base, HSI_GDD_CDSA_REG(lch));
}
/* HSI CSSA register takes a 32-bit address when copying from memory */
/* SSI CSSA register always takes a 32-bit address */
hsi_outl(src_addr, base, HSI_GDD_CSSA_REG(lch));
hsi_outw(size, 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;
}