#define debug_printk(x)
#endif
+#ifndef CONFIG_ARCH_OMAP1
+enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
+ DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
+};
+
+enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
+#endif
+
#define OMAP_DMA_ACTIVE 0x01
#define OMAP_DMA_CCR_EN (1 << 7)
#define OMAP2_DMA_CSR_CLEAR_MASK 0xffe
const char *dev_name;
void (* callback)(int lch, u16 ch_status, void *data);
void *data;
+
+#ifndef CONFIG_ARCH_OMAP1
+ /* required for Dynamic chaining */
+ int prev_linked_ch;
+ int next_linked_ch;
+ int state;
+ int chain_id;
+
+ int status;
+#endif
long flags;
};
+#ifndef CONFIG_ARCH_OMAP1
+struct dma_link_info {
+ int *linked_dmach_q;
+ int no_of_lchs_linked;
+
+ int q_count;
+ int q_tail;
+ int q_head;
+
+ int chain_state;
+ int chain_mode;
+
+};
+
+static struct dma_link_info dma_linked_lch[OMAP_LOGICAL_DMA_CH_COUNT];
+
+/* Chain handling macros */
+#define OMAP_DMA_CHAIN_QINIT(chain_id) \
+ do { \
+ dma_linked_lch[chain_id].q_head = \
+ dma_linked_lch[chain_id].q_tail = \
+ dma_linked_lch[chain_id].q_count = 0; \
+ } while (0)
+#define OMAP_DMA_CHAIN_QFULL(chain_id) \
+ (dma_linked_lch[chain_id].no_of_lchs_linked == \
+ dma_linked_lch[chain_id].q_count)
+#define OMAP_DMA_CHAIN_QLAST(chain_id) \
+ do { \
+ ((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
+ dma_linked_lch[chain_id].q_count) \
+ } while (0)
+#define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
+ (0 == dma_linked_lch[chain_id].q_count)
+#define __OMAP_DMA_CHAIN_INCQ(end) \
+ ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
+#define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
+ do { \
+ __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
+ dma_linked_lch[chain_id].q_count--; \
+ } while (0)
+
+#define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
+ do { \
+ __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
+ dma_linked_lch[chain_id].q_count++; \
+ } while (0)
+#endif
static int dma_chan_count;
static spinlock_t dma_chan_lock;
INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
};
+static inline void disable_lnk(int lch);
+static void omap_disable_channel_irq(int lch);
+static inline void omap_enable_channel_irq(int lch);
+
#define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
__FUNCTION__);
if (dma_chan[lch].next_lch != -1)
OMAP_DMA_CLNK_CTRL_REG(lch) =
dma_chan[lch].next_lch | (1 << 15);
+
+#ifndef CONFIG_ARCH_OMAP1
+ if (dma_chan[lch].next_linked_ch != -1)
+ OMAP_DMA_CLNK_CTRL_REG(lch) =
+ dma_chan[lch].next_linked_ch | (1 << 15);
+#endif
}
static inline void disable_lnk(int lch)
chan->dev_name = dev_name;
chan->callback = callback;
chan->data = data;
+#ifndef CONFIG_ARCH_OMAP1
+ chan->chain_id = -1;
+#endif
chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
if (cpu_class_is_omap1())
dma_chan[lch_head].next_lch = -1;
}
+#ifndef CONFIG_ARCH_OMAP1
+/* Create chain of DMA channesls */
+static void create_dma_lch_chain(int lch_head, int lch_queue)
+{
+ u32 w;
+
+ /* Check if this is the first link in chain */
+ if (dma_chan[lch_head].next_linked_ch == -1) {
+ dma_chan[lch_head].next_linked_ch = lch_queue;
+ dma_chan[lch_head].prev_linked_ch = lch_queue;
+ dma_chan[lch_queue].next_linked_ch = lch_head;
+ dma_chan[lch_queue].prev_linked_ch = lch_head;
+ }
+
+ /* a link exists, link the new channel in circular chain */
+ else {
+ dma_chan[lch_queue].next_linked_ch =
+ dma_chan[lch_head].next_linked_ch;
+ dma_chan[lch_queue].prev_linked_ch = lch_head;
+ dma_chan[lch_head].next_linked_ch = lch_queue;
+ dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
+ lch_queue;
+ }
+
+ w = OMAP_DMA_CLNK_CTRL_REG(lch_head);
+ w &= ~(0x0f);
+ w |= lch_queue ;
+ OMAP_DMA_CLNK_CTRL_REG(lch_head) = w;
+
+ w = OMAP_DMA_CLNK_CTRL_REG(lch_queue);
+ w &= ~(0x0f);
+ w |= (dma_chan[lch_queue].next_linked_ch);
+ OMAP_DMA_CLNK_CTRL_REG(lch_queue) = w;
+}
+
+/**
+ * @brief omap_request_dma_chain : Request a chain of DMA channels
+ *
+ * @param dev_id - Device id using the dma channel
+ * @param dev_name - Device name
+ * @param callback - Call back function
+ * @chain_id -
+ * @no_of_chans - Number of channels requested
+ * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
+ * OMAP_DMA_DYNAMIC_CHAIN
+ * @params - Channel parameters
+ *
+ * @return - Succes : 0
+ * Failure: -EINVAL/-ENOMEM
+ */
+int omap_request_dma_chain(int dev_id, const char *dev_name,
+ void (*callback) (int chain_id, u16 ch_status,
+ void *data),
+ int *chain_id, int no_of_chans, int chain_mode,
+ struct omap_dma_channel_params params)
+{
+ int *channels;
+ int i, err;
+
+ /* Is the chain mode valid ? */
+ if (chain_mode != OMAP_DMA_STATIC_CHAIN
+ && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
+ printk(KERN_ERR "Invalid chain mode requested \n");
+ return -EINVAL;
+ }
+
+ if (unlikely((no_of_chans < 1
+ || no_of_chans > OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid Number of channels requested\n");
+ return -EINVAL;
+ }
+
+ /* Allocate a queue to maintain the status of the channels
+ * in the chain */
+ channels = (int *)kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
+ if (channels == NULL) {
+ printk(KERN_ERR "omap_dma: No memory for channel queue\n");
+ return -ENOMEM;
+ }
+
+ /* request and reserve DMA channels for the chain */
+ for (i = 0; i < no_of_chans; i++) {
+ err = omap_request_dma(dev_id, dev_name,
+ callback, 0, &channels[i]);
+ if (err < 0) {
+ int j;
+ for (j = 0; j < i; j++)
+ omap_free_dma(channels[j]);
+ kfree(channels);
+ printk(KERN_ERR "omap_dma: Request failed %d\n", err);
+ return err;
+ }
+ dma_chan[channels[i]].next_linked_ch = -1;
+ dma_chan[channels[i]].prev_linked_ch = -1;
+ dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+
+ /*
+ * Allowing client drivers to set common parameters now,
+ * so that later only relevant (src_start, dest_start
+ * and element count) can be set
+ */
+ omap_set_dma_params(channels[i], ¶ms);
+ }
+
+ *chain_id = channels[0];
+ dma_linked_lch[*chain_id].linked_dmach_q = channels;
+ dma_linked_lch[*chain_id].chain_mode = chain_mode;
+ dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
+ dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
+
+ for (i = 0; i < no_of_chans; i++)
+ dma_chan[channels[i]].chain_id = *chain_id;
+
+ /* Reset the Queue pointers */
+ OMAP_DMA_CHAIN_QINIT(*chain_id);
+
+ /* Set up the chain */
+ if (no_of_chans == 1)
+ create_dma_lch_chain(channels[0], channels[0]);
+ else {
+ for (i = 0; i < (no_of_chans - 1); i++)
+ create_dma_lch_chain(channels[i], channels[i + 1]);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(omap_request_dma_chain);
+
+/**
+ * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
+ * params after setting it. Dont do this while dma is running!!
+ *
+ * @param chain_id - Chained logical channel id.
+ * @param params
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL
+ */
+int omap_modify_dma_chain_params(int chain_id,
+ struct omap_dma_channel_params params)
+{
+ int *channels;
+ u32 i;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0
+ || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+ /*
+ * Allowing client drivers to set common parameters now,
+ * so that later only relevant (src_start, dest_start
+ * and element count) can be set
+ */
+ omap_set_dma_params(channels[i], ¶ms);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(omap_modify_dma_chain_params);
+
+/**
+ * @brief omap_free_dma_chain - Free all the logical channels in a chain.
+ *
+ * @param chain_id
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL
+ */
+int omap_free_dma_chain(int chain_id)
+{
+ int *channels;
+ u32 i;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+ dma_chan[channels[i]].next_linked_ch = -1;
+ dma_chan[channels[i]].prev_linked_ch = -1;
+ dma_chan[channels[i]].chain_id = -1;
+ dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+ omap_free_dma(channels[i]);
+ }
+
+ kfree(channels);
+
+ dma_linked_lch[chain_id].linked_dmach_q = NULL;
+ dma_linked_lch[chain_id].chain_mode = -1;
+ dma_linked_lch[chain_id].chain_state = -1;
+ return (0);
+}
+EXPORT_SYMBOL(omap_free_dma_chain);
+
+/**
+ * @brief omap_dma_chain_status - Check if the chain is in
+ * active / inactive state.
+ * @param chain_id
+ *
+ * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ * Failure : -EINVAL
+ */
+int omap_dma_chain_status(int chain_id)
+{
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ debug_printk((KERN_INFO "CHAINID=%d, qcnt=%d\n", chain_id,
+ dma_linked_lch[chain_id].q_count));
+
+ if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
+ return OMAP_DMA_CHAIN_INACTIVE;
+ return OMAP_DMA_CHAIN_ACTIVE;
+}
+EXPORT_SYMBOL(omap_dma_chain_status);
+
+/**
+ * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
+ * set the params and start the transfer.
+ *
+ * @param chain_id
+ * @param src_start - buffer start address
+ * @param dest_start - Dest address
+ * @param elem_count
+ * @param frame_count
+ * @param callbk_data - channel callback parameter data.
+ *
+ * @return - Success : start_dma status
+ * Failure: -EINVAL/-EBUSY
+ */
+int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
+ int elem_count, int frame_count, void *callbk_data)
+{
+ int *channels;
+ u32 w, lch;
+ int start_dma = 0;
+
+ /* if buffer size is less than 1 then there is
+ * no use of starting the chain */
+ if (elem_count < 1) {
+ printk(KERN_ERR "Invalid buffer size\n");
+ return -EINVAL;
+ }
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0
+ || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exist\n");
+ return -EINVAL;
+ }
+
+ /* Check if all the channels in chain are in use */
+ if (OMAP_DMA_CHAIN_QFULL(chain_id))
+ return -EBUSY;
+
+ /* Frame count may be negative in case of indexed transfers */
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get a free channel */
+ lch = channels[dma_linked_lch[chain_id].q_tail];
+
+ /* Store the callback data */
+ dma_chan[lch].data = callbk_data;
+
+ /* Increment the q_tail */
+ OMAP_DMA_CHAIN_INCQTAIL(chain_id);
+
+ /* Set the params to the free channel */
+ if (src_start != 0)
+ OMAP2_DMA_CSSA_REG(lch) = src_start;
+ if (dest_start != 0)
+ OMAP2_DMA_CDSA_REG(lch) = dest_start;
+
+ /* Write the buffer size */
+ OMAP_DMA_CEN_REG(lch) = elem_count;
+ OMAP_DMA_CFN_REG(lch) = frame_count;
+
+ /* If the chain is dynamically linked,
+ * then we may have to start the chain if its not active */
+ if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
+
+ /* In Dynamic chain, if the chain is not started,
+ * queue the channel */
+ if (dma_linked_lch[chain_id].chain_state ==
+ DMA_CHAIN_NOTSTARTED) {
+ /* Enable the link in previous channel */
+ if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
+ DMA_CH_QUEUED)
+ enable_lnk(dma_chan[lch].prev_linked_ch);
+ dma_chan[lch].state = DMA_CH_QUEUED;
+ }
+
+ /* Chain is already started, make sure its active,
+ * if not then start the chain */
+ else {
+ start_dma = 1;
+
+ if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
+ DMA_CH_STARTED) {
+ enable_lnk(dma_chan[lch].prev_linked_ch);
+ dma_chan[lch].state = DMA_CH_QUEUED;
+ start_dma = 0;
+ if (0 == ((1 << 7) & (OMAP_DMA_CCR_REG
+ (dma_chan[lch].prev_linked_ch)))) {
+ disable_lnk(dma_chan[lch].
+ prev_linked_ch);
+ debug_printk((KERN_INFO
+ "\n prev ch is stopped\n"));
+ start_dma = 1;
+ }
+ }
+
+ else if (dma_chan[dma_chan[lch].prev_linked_ch].state
+ == DMA_CH_QUEUED) {
+ enable_lnk(dma_chan[lch].prev_linked_ch);
+ dma_chan[lch].state = DMA_CH_QUEUED;
+ start_dma = 0;
+ }
+ omap_enable_channel_irq(lch);
+
+ w = OMAP_DMA_CCR_REG(lch);
+
+ if ((0 == (w & (1 << 24))))
+ w &= ~(1 << 25);
+ else
+ w |= (1 << 25);
+ if (start_dma == 1) {
+ if (0 == (w & (1 << 7))) {
+ w |= (1 << 7);
+ dma_chan[lch].state = DMA_CH_STARTED;
+ debug_printk((KERN_INFO
+ "starting %d\n", lch));
+ OMAP_DMA_CCR_REG(lch) = w;
+ } else
+ start_dma = 0;
+ } else {
+ if (0 == (w & (1 << 7)))
+ OMAP_DMA_CCR_REG(lch) = w;
+ }
+ dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
+ }
+ }
+ return start_dma;
+}
+EXPORT_SYMBOL(omap_dma_chain_a_transfer);
+
+/**
+ * @brief omap_start_dma_chain_transfers - Start the chain
+ *
+ * @param chain_id
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL/-EBUSY
+ */
+int omap_start_dma_chain_transfers(int chain_id)
+{
+ int *channels;
+ u32 w, i;
+
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
+ printk(KERN_ERR "Chain is already started \n");
+ return -EBUSY;
+ }
+
+ if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
+ i++) {
+ enable_lnk(channels[i]);
+ omap_enable_channel_irq(channels[i]);
+ }
+ } else {
+ omap_enable_channel_irq(channels[0]);
+ }
+
+ w = OMAP_DMA_CCR_REG(channels[0]);
+ w |= (1 << 7);
+ dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
+ dma_chan[channels[0]].state = DMA_CH_STARTED;
+
+ if ((0 == (w & (1 << 24))))
+ w &= ~(1 << 25);
+ else
+ w |= (1 << 25);
+ OMAP_DMA_CCR_REG(channels[0]) = w;
+
+ dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
+ return 0;
+}
+EXPORT_SYMBOL(omap_start_dma_chain_transfers);
+
+/**
+ * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
+ *
+ * @param chain_id
+ *
+ * @return - Success : 0
+ * Failure : EINVAL
+ */
+int omap_stop_dma_chain_transfers(int chain_id)
+{
+ int *channels;
+ u32 w, i;
+ u32 sys_cf;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* DMA Errata:
+ * Special programming model needed to disable DMA before end of block
+ */
+ sys_cf = omap_readl(OMAP_DMA4_OCP_SYSCONFIG);
+ w = sys_cf;
+ /* Middle mode reg set no Standby */
+ w &= ~((1 << 12)|(1 << 13));
+ omap_writel(w, OMAP_DMA4_OCP_SYSCONFIG);
+
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+
+ /* Stop the Channel transmission */
+ w = OMAP_DMA_CCR_REG(channels[i]);
+ w &= ~(1 << 7);
+ OMAP_DMA_CCR_REG(channels[i]) = w;
+
+ /* Disable the link in all the channels */
+ disable_lnk(channels[i]);
+ dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+
+ }
+ dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
+
+ /* Reset the Queue pointers */
+ OMAP_DMA_CHAIN_QINIT(chain_id);
+
+ /* Errata - put in the old value */
+ omap_writel(sys_cf, OMAP_DMA4_OCP_SYSCONFIG);
+ return 0;
+}
+EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
+
+/* Get the index of the ongoing DMA in chain */
+/**
+ * @brief omap_get_dma_chain_index - Get the element and frame index
+ * of the ongoing DMA in chain
+ *
+ * @param chain_id
+ * @param ei - Element index
+ * @param fi - Frame index
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL
+ */
+int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
+{
+ int lch;
+ int *channels;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ if ((!ei) || (!fi))
+ return -EINVAL;
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get the current channel */
+ lch = channels[dma_linked_lch[chain_id].q_head];
+
+ *ei = OMAP2_DMA_CCEN_REG(lch);
+ *fi = OMAP2_DMA_CCFN_REG(lch);
+
+ return 0;
+}
+EXPORT_SYMBOL(omap_get_dma_chain_index);
+
+/**
+ * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
+ * ongoing DMA in chain
+ *
+ * @param chain_id
+ *
+ * @return - Success : Destination position
+ * Failure : -EINVAL
+ */
+int omap_get_dma_chain_dst_pos(int chain_id)
+{
+ int lch;
+ int *channels;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get the current channel */
+ lch = channels[dma_linked_lch[chain_id].q_head];
+
+ return (OMAP_DMA_CDAC_REG(lch));
+}
+EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
+
+/**
+ * @brief omap_get_dma_chain_src_pos - Get the source position
+ * of the ongoing DMA in chain
+ * @param chain_id
+ *
+ * @return - Success : Destination position
+ * Failure : -EINVAL
+ */
+int omap_get_dma_chain_src_pos(int chain_id)
+{
+ int lch;
+ int *channels;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get the current channel */
+ lch = channels[dma_linked_lch[chain_id].q_head];
+
+ return (OMAP_DMA_CSAC_REG(lch));
+}
+EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
+#endif
+
/*----------------------------------------------------------------------------*/
#ifdef CONFIG_ARCH_OMAP1
OMAP_DMA_CSR_REG(ch) = OMAP2_DMA_CSR_CLEAR_MASK;
omap_writel(1 << ch, OMAP_DMA4_IRQSTATUS_L0);
- if (likely(dma_chan[ch].callback != NULL))
- dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+ /* If the ch is not chained then chain_id will be -1 */
+ if (dma_chan[ch].chain_id != -1) {
+ int chain_id = dma_chan[ch].chain_id;
+ dma_chan[ch].state = DMA_CH_NOTSTARTED;
+ if (OMAP_DMA_CLNK_CTRL_REG(ch) & (1 << 15))
+ dma_chan[dma_chan[ch].next_linked_ch].state =
+ DMA_CH_STARTED;
+ if (dma_linked_lch[chain_id].chain_mode ==
+ OMAP_DMA_DYNAMIC_CHAIN)
+ disable_lnk(ch);
+
+ if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
+ OMAP_DMA_CHAIN_INCQHEAD(chain_id);
+ }
+
+ status = OMAP_DMA_CSR_REG(ch);
+
+ if (likely(dma_chan[ch].callback != NULL)) {
+ if (dma_chan[ch].chain_id != -1)
+ dma_chan[ch].callback(dma_chan[ch].chain_id, status,
+ dma_chan[ch].data);
+ else
+ dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+
+ }
+
+ OMAP_DMA_CSR_REG(ch) = status;
return 0;
}
projects / linux-2.6-omap-h63xx.git / commitdiff