int omap_st_is_enabled(unsigned int id)
{
struct omap_mcbsp *mcbsp;
struct omap_mcbsp_st_data *st_data;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
st_data = mcbsp->st_data;
if (!st_data)
return -ENODEV;
return st_data->enabled;
}
int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
{
struct omap_mcbsp *mcbsp;
struct clk *fck_src;
char *fck_src_name;
int r;
if (!omap_mcbsp_check_valid_id(id)) {
pr_err("%s: Invalid id (%d)\n", __func__, id + 1);
return -EINVAL;
}
mcbsp = id_to_mcbsp_ptr(id);
if (fck_src_id == MCBSP_CLKS_PAD_SRC)
fck_src_name = "pad_fck";
else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
fck_src_name = "prcm_fck";
else
return -EINVAL;
fck_src = clk_get(mcbsp->dev, fck_src_name);
if (IS_ERR_OR_NULL(fck_src)) {
pr_err("omap-mcbsp: %s: could not clk_get() %s\n", "clks",
fck_src_name);
return -EINVAL;
}
clk_disable(mcbsp->fclk);
r = clk_set_parent(mcbsp->fclk, fck_src);
if (IS_ERR_VALUE(r)) {
pr_err("omap-mcbsp: %s: could not clk_set_parent() to %s\n",
"clks", fck_src_name);
clk_put(fck_src);
return -EINVAL;
}
clk_enable(mcbsp->fclk);
clk_put(fck_src);
return 0;
}
/*
* omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
*/
u16 omap_mcbsp_get_tx_delay(unsigned int id)
{
struct omap_mcbsp *mcbsp;
u16 buffstat;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
if (mcbsp->pdata->buffer_size == 0)
return 0;
/* Returns the number of free locations in the buffer */
buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
/* Number of slots are different in McBSP ports */
return mcbsp->pdata->buffer_size - buffstat;
}
/*
* Reset Receiver
* id : McBSP interface number
* state : Disable (0)/ Enable (1) the receiver
*/
int omap2_mcbsp_set_rrst(unsigned int id, u8 state)
{
struct omap_mcbsp *mcbsp = mcbsp_ptr[id];
void __iomem *io_base;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
io_base = mcbsp->io_base;
if (state == OMAP_MCBSP_RRST_DISABLE)
OMAP_MCBSP_WRITE(mcbsp, SPCR1,
OMAP_MCBSP_READ(mcbsp, SPCR1) & (~RRST));
else
OMAP_MCBSP_WRITE(mcbsp, SPCR1,
OMAP_MCBSP_READ(mcbsp, SPCR1) | RRST);
udelay(10);
return 0;
}
/*
* omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
* to reach the threshold value (when the DMA will be triggered to read it)
*/
u16 omap_mcbsp_get_rx_delay(unsigned int id)
{
struct omap_mcbsp *mcbsp;
u16 buffstat, threshold;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
/* Returns the number of used locations in the buffer */
buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
/* RX threshold */
threshold = MCBSP_READ(mcbsp, THRSH1);
/* Return the number of location till we reach the threshold limit */
if (threshold <= buffstat)
return 0;
else
return threshold - buffstat;
}
int omap_st_enable(unsigned int id)
{
struct omap_mcbsp *mcbsp;
struct omap_mcbsp_st_data *st_data;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
st_data = mcbsp->st_data;
if (!st_data)
return -ENODEV;
spin_lock_irq(&mcbsp->lock);
st_data->enabled = 1;
omap_st_start(mcbsp);
spin_unlock_irq(&mcbsp->lock);
return 0;
}
int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
{
struct omap_mcbsp *mcbsp;
const char *src;
if (!omap_mcbsp_check_valid_id(id)) {
pr_err("%s: Invalid id (%d)\n", __func__, id + 1);
return -EINVAL;
}
mcbsp = id_to_mcbsp_ptr(id);
if (fck_src_id == MCBSP_CLKS_PAD_SRC)
src = "clks_ext";
else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
src = "clks_fclk";
else
return -EINVAL;
if (mcbsp->pdata->set_clk_src)
return mcbsp->pdata->set_clk_src(mcbsp->dev, mcbsp->fclk, src);
else
return -EINVAL;
}
void omap_mcbsp_free(unsigned int id)
{
struct omap_mcbsp *mcbsp;
void *reg_cache;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return;
}
mcbsp = id_to_mcbsp_ptr(id);
if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
mcbsp->pdata->ops->free(id);
/* Disable wakeup behavior */
if (mcbsp->pdata->has_wakeup)
MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
pm_runtime_put_sync(mcbsp->dev);
if (mcbsp->rx_irq)
free_irq(mcbsp->rx_irq, (void *)mcbsp);
free_irq(mcbsp->tx_irq, (void *)mcbsp);
reg_cache = mcbsp->reg_cache;
spin_lock(&mcbsp->lock);
if (mcbsp->free)
dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
else
mcbsp->free = true;
mcbsp->reg_cache = NULL;
spin_unlock(&mcbsp->lock);
if (reg_cache)
kfree(reg_cache);
}
void omap_mcbsp_free(unsigned int id)
{
struct omap_mcbsp *mcbsp;
void *reg_cache;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return;
}
mcbsp = id_to_mcbsp_ptr(id);
if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
mcbsp->pdata->ops->free(id);
/* Do procedure specific to omap34xx arch, if applicable */
omap34xx_mcbsp_free(mcbsp);
pm_runtime_put_sync(mcbsp->dev);
if (mcbsp->rx_irq)
free_irq(mcbsp->rx_irq, (void *)mcbsp);
free_irq(mcbsp->tx_irq, (void *)mcbsp);
reg_cache = mcbsp->reg_cache;
spin_lock(&mcbsp->lock);
if (mcbsp->free)
dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
else
mcbsp->free = true;
mcbsp->reg_cache = NULL;
spin_unlock(&mcbsp->lock);
if (reg_cache)
kfree(reg_cache);
}
/*
* Here we start the McBSP, by enabling transmitter, receiver or both.
* If no transmitter or receiver is active prior calling, then sample-rate
* generator and frame sync are started.
*/
void omap_mcbsp_start(unsigned int id, int tx, int rx)
{
struct omap_mcbsp *mcbsp;
int enable_srg = 0;
u16 w;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return;
}
mcbsp = id_to_mcbsp_ptr(id);
if (cpu_is_omap34xx())
omap_st_start(mcbsp);
/* Only enable SRG, if McBSP is master */
w = MCBSP_READ_CACHE(mcbsp, PCR0);
if (w & (FSXM | FSRM | CLKXM | CLKRM))
enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
if (enable_srg) {
/* Start the sample generator */
w = MCBSP_READ_CACHE(mcbsp, SPCR2);
MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
}
/* Enable transmitter and receiver */
tx &= 1;
w = MCBSP_READ_CACHE(mcbsp, SPCR2);
MCBSP_WRITE(mcbsp, SPCR2, w | tx);
rx &= 1;
w = MCBSP_READ_CACHE(mcbsp, SPCR1);
MCBSP_WRITE(mcbsp, SPCR1, w | rx);
/*
* Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
* REVISIT: 100us may give enough time for two CLKSRG, however
* due to some unknown PM related, clock gating etc. reason it
* is now at 500us.
*/
udelay(500);
if (enable_srg) {
/* Start frame sync */
w = MCBSP_READ_CACHE(mcbsp, SPCR2);
MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
}
if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
/* Release the transmitter and receiver */
w = MCBSP_READ_CACHE(mcbsp, XCCR);
w &= ~(tx ? XDISABLE : 0);
MCBSP_WRITE(mcbsp, XCCR, w);
w = MCBSP_READ_CACHE(mcbsp, RCCR);
w &= ~(rx ? RDISABLE : 0);
MCBSP_WRITE(mcbsp, RCCR, w);
}
/* Dump McBSP Regs */
omap_mcbsp_dump_reg(id);
}
int omap_mcbsp_request(unsigned int id)
{
struct omap_mcbsp *mcbsp;
void *reg_cache;
int err;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
reg_cache = kzalloc(omap_mcbsp_cache_size, GFP_KERNEL);
if (!reg_cache) {
return -ENOMEM;
}
spin_lock(&mcbsp->lock);
if (!mcbsp->free) {
dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
mcbsp->id);
err = -EBUSY;
goto err_kfree;
}
mcbsp->free = false;
mcbsp->reg_cache = reg_cache;
spin_unlock(&mcbsp->lock);
if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
mcbsp->pdata->ops->request(id);
pm_runtime_get_sync(mcbsp->dev);
/* Do procedure specific to omap34xx arch, if applicable */
omap34xx_mcbsp_request(mcbsp);
/*
* Make sure that transmitter, receiver and sample-rate generator are
* not running before activating IRQs.
*/
MCBSP_WRITE(mcbsp, SPCR1, 0);
MCBSP_WRITE(mcbsp, SPCR2, 0);
err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
0, "McBSP", (void *)mcbsp);
if (err != 0) {
dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
"for McBSP%d\n", mcbsp->tx_irq,
mcbsp->id);
goto err_clk_disable;
}
if (mcbsp->rx_irq) {
err = request_irq(mcbsp->rx_irq,
omap_mcbsp_rx_irq_handler,
0, "McBSP", (void *)mcbsp);
if (err != 0) {
dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
"for McBSP%d\n", mcbsp->rx_irq,
mcbsp->id);
goto err_free_irq;
}
}
return 0;
err_free_irq:
free_irq(mcbsp->tx_irq, (void *)mcbsp);
err_clk_disable:
if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
mcbsp->pdata->ops->free(id);
/* Do procedure specific to omap34xx arch, if applicable */
omap34xx_mcbsp_free(mcbsp);
pm_runtime_put_sync(mcbsp->dev);
spin_lock(&mcbsp->lock);
mcbsp->free = true;
mcbsp->reg_cache = NULL;
err_kfree:
spin_unlock(&mcbsp->lock);
kfree(reg_cache);
return err;
}
/*
* Start transmitting data through a McBSP interface
* id : McBSP interface ID
* cbdata : User data to be returned with callback
* buf_start_addr : The source address [This should be physical address]
* buf_size : Buffer size
*/
int omap2_mcbsp_send_data(unsigned int id, void *cbdata,
dma_addr_t buf_start_addr, u32 buf_size)
{
struct omap_mcbsp *mcbsp;
void __iomem *io_base;
u8 enable_tx = 0;
int e_count = 0;
int f_count = 0;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
io_base = mcbsp->io_base;
mcbsp->tx_cb_arg = cbdata;
/* Auto RRST handling logic - disable the Reciever before 1st dma */
if ((mcbsp->auto_reset & OMAP_MCBSP_AUTO_XRST) &&
(omap_dma_chain_status(mcbsp->dma_tx_lch)
== OMAP_DMA_CHAIN_INACTIVE)) {
OMAP_MCBSP_WRITE(mcbsp, SPCR2,
OMAP_MCBSP_READ(mcbsp, SPCR2) & (~XRST));
enable_tx = 1;
}
/*
* for skip_first and second, we need to set e_count =2, and
* f_count = number of frames = number of elements/e_count
*/
e_count = (buf_size / mcbsp->tx_word_length);
if (mcbsp->txskip_alt != OMAP_MCBSP_SKIP_NONE) {
/*
* number of frames = total number of elements/element count,
* However, with double indexing for data transfers, double I
* the number of elements need to be transmitted
*/
f_count = e_count;
e_count = 2;
} else {
f_count = 1;
}
/*
* If the DMA is to be configured to skip the first byte, we need
* to jump backwards, so we need to move one chunk forward and ask
* dma if we dont want the client driver knowing abt this.
*/
if (mcbsp->txskip_alt == OMAP_MCBSP_SKIP_FIRST)
buf_start_addr += mcbsp->tx_word_length;
if (omap_dma_chain_a_transfer(mcbsp->dma_tx_lch,
buf_start_addr, mcbsp->phys_base + OMAP_MCBSP_REG_DXR,
e_count, f_count, mcbsp) < 0)
return -EINVAL;
if (mcbsp->tx_dma_chain_state == 0) {
if (mcbsp->interface_mode == OMAP_MCBSP_MASTER)
omap2_mcbsp_set_srg_fsg(id, OMAP_MCBSP_ENABLE_FSG_SRG);
if (omap_start_dma_chain_transfers(mcbsp->dma_tx_lch) < 0)
return -EINVAL;
mcbsp->tx_dma_chain_state = 1;
}
/* Auto XRST handling logic - Enable the Reciever after 1st dma */
if (enable_tx &&
(omap_dma_chain_status(mcbsp->dma_tx_lch)
== OMAP_DMA_CHAIN_ACTIVE))
OMAP_MCBSP_WRITE(mcbsp, SPCR2,
OMAP_MCBSP_READ(mcbsp, SPCR2) | XRST);
return 0;
}
int omap2_mcbsp_dma_trans_params(unsigned int id,
struct omap_mcbsp_dma_transfer_params *tp)
{
struct omap_mcbsp *mcbsp;
struct omap_dma_channel_params tx_params;
int err = 0, chain_id = -1;
void __iomem *io_base;
u32 dt = 0;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
io_base = mcbsp->io_base;
dt = tp->word_length1;
if ((dt != OMAP_MCBSP_WORD_8) && (dt != OMAP_MCBSP_WORD_16)
&& (dt != OMAP_MCBSP_WORD_32))
return -EINVAL;
if (dt == OMAP_MCBSP_WORD_8)
tx_params.data_type = OMAP_DMA_DATA_TYPE_S8;
else if (dt == OMAP_MCBSP_WORD_16)
tx_params.data_type = OMAP_DMA_DATA_TYPE_S16;
else if (dt == OMAP_MCBSP_WORD_32)
tx_params.data_type = OMAP_DMA_DATA_TYPE_S32;
else
return -EINVAL;
tx_params.read_prio = DMA_CH_PRIO_HIGH;
tx_params.write_prio = DMA_CH_PRIO_HIGH;
tx_params.sync_mode = OMAP_DMA_SYNC_ELEMENT;
tx_params.dst_fi = 0;
tx_params.trigger = mcbsp->dma_tx_sync;
tx_params.src_or_dst_synch = 0;
tx_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
tx_params.dst_ei = 0;
/* Indexing is always in bytes - so multiply with dt */
mcbsp->tx_word_length = tx_params.data_type << 0x1;
if (tx_params.data_type == 0)
mcbsp->tx_word_length = 1;
dt = mcbsp->tx_word_length;
/* SKIP_FIRST and SKIP_SECOND- skip alternate data in 24 bit mono */
if (tp->skip_alt == OMAP_MCBSP_SKIP_SECOND) {
tx_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
tx_params.src_ei = (1);
tx_params.src_fi = (1) + ((-1) * dt);
} else if (tp->skip_alt == OMAP_MCBSP_SKIP_FIRST) {
tx_params.src_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
tx_params.src_ei = 1 + (-2) * dt;
tx_params.src_fi = 1 + (2) * dt;
} else {
tx_params.src_amode = OMAP_DMA_AMODE_POST_INC;
tx_params.src_ei = 0;
tx_params.src_fi = 0;
}
mcbsp->txskip_alt = tp->skip_alt;
mcbsp->auto_reset &= ~OMAP_MCBSP_AUTO_XRST;
mcbsp->auto_reset |=
(tp->auto_reset & OMAP_MCBSP_AUTO_XRST);
mcbsp->tx_callback = tp->callback;
/* Based on Rjust we can do double indexing DMA params configuration */
if (mcbsp->dma_tx_lch == -1) {
err = omap_request_dma_chain(id, "McBSP TX",
omap2_mcbsp_tx_dma_callback, &chain_id,
2, OMAP_DMA_DYNAMIC_CHAIN, tx_params);
if (err < 0) {
printk(KERN_ERR
"Transmit path configuration failed \n");
return -EINVAL;
}
mcbsp->tx_dma_chain_state = 0;
mcbsp->dma_tx_lch = chain_id;
} else {
/* DMA params already set, modify the same!! */
err = omap_modify_dma_chain_params(mcbsp->dma_tx_lch,
tx_params);
if (err < 0)
return -EINVAL;
}
return 0;
}
/*
* Configure the receiver parameters
* id : McBSP Interface ID
* rp : DMA Receive parameters
*/
int omap2_mcbsp_dma_recv_params(unsigned int id,
struct omap_mcbsp_dma_transfer_params *rp)
{
struct omap_mcbsp *mcbsp;
void __iomem *io_base;
int err, chain_id = -1;
struct omap_dma_channel_params rx_params;
u32 dt = 0;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
io_base = mcbsp->io_base;
dt = rp->word_length1;
if (dt == OMAP_MCBSP_WORD_8)
rx_params.data_type = OMAP_DMA_DATA_TYPE_S8;
else if (dt == OMAP_MCBSP_WORD_16)
rx_params.data_type = OMAP_DMA_DATA_TYPE_S16;
else if (dt == OMAP_MCBSP_WORD_32)
rx_params.data_type = OMAP_DMA_DATA_TYPE_S32;
else
return -EINVAL;
rx_params.read_prio = DMA_CH_PRIO_HIGH;
rx_params.write_prio = DMA_CH_PRIO_HIGH;
rx_params.sync_mode = OMAP_DMA_SYNC_ELEMENT;
rx_params.src_fi = 0;
rx_params.trigger = mcbsp->dma_rx_sync;
rx_params.src_or_dst_synch = 0x01;
rx_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
rx_params.src_ei = 0x0;
/* Indexing is always in bytes - so multiply with dt */
dt = (rx_params.data_type == OMAP_DMA_DATA_TYPE_S8) ? 1 :
(rx_params.data_type == OMAP_DMA_DATA_TYPE_S16) ? 2 : 4;
/* SKIP_FIRST and SKIP_SECOND- skip alternate data in 24 bit mono */
if (rp->skip_alt == OMAP_MCBSP_SKIP_SECOND) {
rx_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
rx_params.dst_ei = (1);
rx_params.dst_fi = (1) + ((-1) * dt);
} else if (rp->skip_alt == OMAP_MCBSP_SKIP_FIRST) {
rx_params.dst_amode = OMAP_DMA_AMODE_DOUBLE_IDX;
rx_params.dst_ei = 1 + (-2) * dt;
rx_params.dst_fi = 1 + (2) * dt;
} else {
rx_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
rx_params.dst_ei = 0;
rx_params.dst_fi = 0;
}
mcbsp->rxskip_alt = rp->skip_alt;
mcbsp->auto_reset &= ~OMAP_MCBSP_AUTO_RRST;
mcbsp->auto_reset |= (rp->auto_reset & OMAP_MCBSP_AUTO_RRST);
mcbsp->rx_word_length = rx_params.data_type << 0x1;
if (rx_params.data_type == 0)
mcbsp->rx_word_length = 1;
mcbsp->rx_callback = rp->callback;
/* request for a chain of dma channels for data reception */
if (mcbsp->dma_rx_lch == -1) {
err = omap_request_dma_chain(id, "McBSP RX",
omap2_mcbsp_rx_dma_callback, &chain_id,
2, OMAP_DMA_DYNAMIC_CHAIN, rx_params);
if (err < 0) {
printk(KERN_ERR "Receive path configuration failed \n");
return -EINVAL;
}
mcbsp->dma_rx_lch = chain_id;
mcbsp->rx_dma_chain_state = 0;
} else {
/* DMA params already set, modify the same!! */
err = omap_modify_dma_chain_params(mcbsp->dma_rx_lch,
rx_params);
if (err < 0)
return -EINVAL;
}
return 0;
}
int omap2_mcbsp_receive_data(unsigned int id, void *cbdata,
dma_addr_t buf_start_addr, u32 buf_size)
{
struct omap_mcbsp *mcbsp;
void __iomem *io_base;
int enable_rx = 0;
int e_count = 0;
int f_count = 0;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
io_base = mcbsp->io_base;
mcbsp->rx_cb_arg = cbdata;
/* Auto RRST handling logic - disable the Reciever before 1st dma */
if ((mcbsp->auto_reset & OMAP_MCBSP_AUTO_RRST) &&
(omap_dma_chain_status(mcbsp->dma_rx_lch)
== OMAP_DMA_CHAIN_INACTIVE)) {
OMAP_MCBSP_WRITE(io_base, SPCR1,
OMAP_MCBSP_READ(io_base, SPCR1) & (~RRST));
enable_rx = 1;
}
/*
* for skip_first and second, we need to set e_count =2,
* and f_count = number of frames = number of elements/e_count
*/
e_count = (buf_size / mcbsp->rx_word_length);
if (mcbsp->rxskip_alt != OMAP_MCBSP_SKIP_NONE) {
/*
* since the number of frames = total number of elements/element
* count, However, with double indexing for data transfers,
* double the number of elements need to be transmitted
*/
f_count = e_count;
e_count = 2;
} else {
f_count = 1;
}
/*
* If the DMA is to be configured to skip the first byte, we need
* to jump backwards, so we need to move one chunk forward and
* ask dma if we dont want the client driver knowing abt this.
*/
if (mcbsp->rxskip_alt == OMAP_MCBSP_SKIP_FIRST)
buf_start_addr += mcbsp->rx_word_length;
if (omap_dma_chain_a_transfer(mcbsp->dma_rx_lch,
mcbsp->phys_base + OMAP_MCBSP_REG_DRR, buf_start_addr,
e_count, f_count, mcbsp) < 0) {
printk(KERN_ERR " Buffer chaining failed \n");
return -EINVAL;
}
if (mcbsp->rx_dma_chain_state == 0) {
if (omap_start_dma_chain_transfers(mcbsp->dma_rx_lch) < 0)
return -EINVAL;
mcbsp->rx_dma_chain_state = 1;
}
/* Auto RRST handling logic - Enable the Reciever after 1st dma */
if (enable_rx &&
(omap_dma_chain_status(mcbsp->dma_rx_lch)
== OMAP_DMA_CHAIN_ACTIVE))
OMAP_MCBSP_WRITE(io_base, SPCR1,
OMAP_MCBSP_READ(io_base, SPCR1) | RRST);
return 0;
}
