#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
-#include <linux/wait.h>
-#include <linux/completion.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
-#include <plat/dma.h>
#include <plat/mcbsp.h>
#include <plat/omap_device.h>
#include <linux/pm_runtime.h>
irqst_spcr2);
/* Writing zero to XSYNC_ERR clears the IRQ */
MCBSP_WRITE(mcbsp_tx, SPCR2, MCBSP_READ_CACHE(mcbsp_tx, SPCR2));
- } else {
- complete(&mcbsp_tx->tx_irq_completion);
}
return IRQ_HANDLED;
irqst_spcr1);
/* Writing zero to RSYNC_ERR clears the IRQ */
MCBSP_WRITE(mcbsp_rx, SPCR1, MCBSP_READ_CACHE(mcbsp_rx, SPCR1));
- } else {
- complete(&mcbsp_rx->rx_irq_completion);
}
return IRQ_HANDLED;
}
-static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
-{
- struct omap_mcbsp *mcbsp_dma_tx = data;
-
- dev_dbg(mcbsp_dma_tx->dev, "TX DMA callback : 0x%x\n",
- MCBSP_READ(mcbsp_dma_tx, SPCR2));
-
- /* We can free the channels */
- omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
- mcbsp_dma_tx->dma_tx_lch = -1;
-
- complete(&mcbsp_dma_tx->tx_dma_completion);
-}
-
-static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
-{
- struct omap_mcbsp *mcbsp_dma_rx = data;
-
- dev_dbg(mcbsp_dma_rx->dev, "RX DMA callback : 0x%x\n",
- MCBSP_READ(mcbsp_dma_rx, SPCR2));
-
- /* We can free the channels */
- omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
- mcbsp_dma_rx->dma_rx_lch = -1;
-
- complete(&mcbsp_dma_rx->rx_dma_completion);
-}
-
/*
* omap_mcbsp_config simply write a config to the
* appropriate McBSP.
static inline void omap_st_stop(struct omap_mcbsp *mcbsp) {}
#endif
-/*
- * We can choose between IRQ based or polled IO.
- * This needs to be called before omap_mcbsp_request().
- */
-int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
-{
- struct omap_mcbsp *mcbsp;
-
- 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);
-
- spin_lock(&mcbsp->lock);
-
- if (!mcbsp->free) {
- dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
- mcbsp->id);
- spin_unlock(&mcbsp->lock);
- return -EINVAL;
- }
-
- mcbsp->io_type = io_type;
-
- spin_unlock(&mcbsp->lock);
-
- return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_set_io_type);
-
int omap_mcbsp_request(unsigned int id)
{
struct omap_mcbsp *mcbsp;
MCBSP_WRITE(mcbsp, SPCR1, 0);
MCBSP_WRITE(mcbsp, SPCR2, 0);
- if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
- /* We need to get IRQs here */
- init_completion(&mcbsp->tx_irq_completion);
- err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
- 0, "McBSP", (void *)mcbsp);
+ 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 TX IRQ %d "
- "for McBSP%d\n", mcbsp->tx_irq,
+ dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
+ "for McBSP%d\n", mcbsp->rx_irq,
mcbsp->id);
- goto err_clk_disable;
- }
-
- if (mcbsp->rx_irq) {
- init_completion(&mcbsp->rx_irq_completion);
- 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;
- }
+ goto err_free_irq;
}
}
pm_runtime_put_sync(mcbsp->dev);
- if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
- /* Free IRQs */
- if (mcbsp->rx_irq)
- free_irq(mcbsp->rx_irq, (void *)mcbsp);
- free_irq(mcbsp->tx_irq, (void *)mcbsp);
- }
+ if (mcbsp->rx_irq)
+ free_irq(mcbsp->rx_irq, (void *)mcbsp);
+ free_irq(mcbsp->tx_irq, (void *)mcbsp);
reg_cache = mcbsp->reg_cache;
}
EXPORT_SYMBOL(omap_mcbsp_stop);
-/* polled mcbsp i/o operations */
-int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
-{
- struct omap_mcbsp *mcbsp;
-
- 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);
-
- MCBSP_WRITE(mcbsp, DXR1, buf);
- /* if frame sync error - clear the error */
- if (MCBSP_READ(mcbsp, SPCR2) & XSYNC_ERR) {
- /* clear error */
- MCBSP_WRITE(mcbsp, SPCR2, MCBSP_READ_CACHE(mcbsp, SPCR2));
- /* resend */
- return -1;
- } else {
- /* wait for transmit confirmation */
- int attemps = 0;
- while (!(MCBSP_READ(mcbsp, SPCR2) & XRDY)) {
- if (attemps++ > 1000) {
- MCBSP_WRITE(mcbsp, SPCR2,
- MCBSP_READ_CACHE(mcbsp, SPCR2) &
- (~XRST));
- udelay(10);
- MCBSP_WRITE(mcbsp, SPCR2,
- MCBSP_READ_CACHE(mcbsp, SPCR2) |
- (XRST));
- udelay(10);
- dev_err(mcbsp->dev, "Could not write to"
- " McBSP%d Register\n", mcbsp->id);
- return -2;
- }
- }
- }
-
- return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_pollwrite);
-
-int omap_mcbsp_pollread(unsigned int id, u16 *buf)
-{
- struct omap_mcbsp *mcbsp;
-
- 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 frame sync error - clear the error */
- if (MCBSP_READ(mcbsp, SPCR1) & RSYNC_ERR) {
- /* clear error */
- MCBSP_WRITE(mcbsp, SPCR1, MCBSP_READ_CACHE(mcbsp, SPCR1));
- /* resend */
- return -1;
- } else {
- /* wait for receive confirmation */
- int attemps = 0;
- while (!(MCBSP_READ(mcbsp, SPCR1) & RRDY)) {
- if (attemps++ > 1000) {
- MCBSP_WRITE(mcbsp, SPCR1,
- MCBSP_READ_CACHE(mcbsp, SPCR1) &
- (~RRST));
- udelay(10);
- MCBSP_WRITE(mcbsp, SPCR1,
- MCBSP_READ_CACHE(mcbsp, SPCR1) |
- (RRST));
- udelay(10);
- dev_err(mcbsp->dev, "Could not read from"
- " McBSP%d Register\n", mcbsp->id);
- return -2;
- }
- }
- }
- *buf = MCBSP_READ(mcbsp, DRR1);
-
- return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_pollread);
-
-/*
- * IRQ based word transmission.
- */
-void omap_mcbsp_xmit_word(unsigned int id, u32 word)
-{
- struct omap_mcbsp *mcbsp;
- omap_mcbsp_word_length word_length;
-
- 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);
- word_length = mcbsp->tx_word_length;
-
- wait_for_completion(&mcbsp->tx_irq_completion);
-
- if (word_length > OMAP_MCBSP_WORD_16)
- MCBSP_WRITE(mcbsp, DXR2, word >> 16);
- MCBSP_WRITE(mcbsp, DXR1, word & 0xffff);
-}
-EXPORT_SYMBOL(omap_mcbsp_xmit_word);
-
-u32 omap_mcbsp_recv_word(unsigned int id)
-{
- struct omap_mcbsp *mcbsp;
- u16 word_lsb, word_msb = 0;
- omap_mcbsp_word_length word_length;
-
- 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);
-
- word_length = mcbsp->rx_word_length;
-
- wait_for_completion(&mcbsp->rx_irq_completion);
-
- if (word_length > OMAP_MCBSP_WORD_16)
- word_msb = MCBSP_READ(mcbsp, DRR2);
- word_lsb = MCBSP_READ(mcbsp, DRR1);
-
- return (word_lsb | (word_msb << 16));
-}
-EXPORT_SYMBOL(omap_mcbsp_recv_word);
-
-/*
- * Simple DMA based buffer rx/tx routines.
- * Nothing fancy, just a single buffer tx/rx through DMA.
- * The DMA resources are released once the transfer is done.
- * For anything fancier, you should use your own customized DMA
- * routines and callbacks.
- */
-int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer,
- unsigned int length)
-{
- struct omap_mcbsp *mcbsp;
- int dma_tx_ch;
- int src_port = 0;
- int dest_port = 0;
- int sync_dev = 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);
-
- if (omap_request_dma(mcbsp->dma_tx_sync, "McBSP TX",
- omap_mcbsp_tx_dma_callback,
- mcbsp,
- &dma_tx_ch)) {
- dev_err(mcbsp->dev, " Unable to request DMA channel for "
- "McBSP%d TX. Trying IRQ based TX\n",
- mcbsp->id);
- return -EAGAIN;
- }
- mcbsp->dma_tx_lch = dma_tx_ch;
-
- dev_err(mcbsp->dev, "McBSP%d TX DMA on channel %d\n", mcbsp->id,
- dma_tx_ch);
-
- init_completion(&mcbsp->tx_dma_completion);
-
- if (cpu_class_is_omap1()) {
- src_port = OMAP_DMA_PORT_TIPB;
- dest_port = OMAP_DMA_PORT_EMIFF;
- }
- if (cpu_class_is_omap2())
- sync_dev = mcbsp->dma_tx_sync;
-
- omap_set_dma_transfer_params(mcbsp->dma_tx_lch,
- OMAP_DMA_DATA_TYPE_S16,
- length >> 1, 1,
- OMAP_DMA_SYNC_ELEMENT,
- sync_dev, 0);
-
- omap_set_dma_dest_params(mcbsp->dma_tx_lch,
- src_port,
- OMAP_DMA_AMODE_CONSTANT,
- mcbsp->phys_base + OMAP_MCBSP_REG_DXR1,
- 0, 0);
-
- omap_set_dma_src_params(mcbsp->dma_tx_lch,
- dest_port,
- OMAP_DMA_AMODE_POST_INC,
- buffer,
- 0, 0);
-
- omap_start_dma(mcbsp->dma_tx_lch);
- wait_for_completion(&mcbsp->tx_dma_completion);
-
- return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
-
-int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
- unsigned int length)
-{
- struct omap_mcbsp *mcbsp;
- int dma_rx_ch;
- int src_port = 0;
- int dest_port = 0;
- int sync_dev = 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);
-
- if (omap_request_dma(mcbsp->dma_rx_sync, "McBSP RX",
- omap_mcbsp_rx_dma_callback,
- mcbsp,
- &dma_rx_ch)) {
- dev_err(mcbsp->dev, "Unable to request DMA channel for "
- "McBSP%d RX. Trying IRQ based RX\n",
- mcbsp->id);
- return -EAGAIN;
- }
- mcbsp->dma_rx_lch = dma_rx_ch;
-
- dev_err(mcbsp->dev, "McBSP%d RX DMA on channel %d\n", mcbsp->id,
- dma_rx_ch);
-
- init_completion(&mcbsp->rx_dma_completion);
-
- if (cpu_class_is_omap1()) {
- src_port = OMAP_DMA_PORT_TIPB;
- dest_port = OMAP_DMA_PORT_EMIFF;
- }
- if (cpu_class_is_omap2())
- sync_dev = mcbsp->dma_rx_sync;
-
- omap_set_dma_transfer_params(mcbsp->dma_rx_lch,
- OMAP_DMA_DATA_TYPE_S16,
- length >> 1, 1,
- OMAP_DMA_SYNC_ELEMENT,
- sync_dev, 0);
-
- omap_set_dma_src_params(mcbsp->dma_rx_lch,
- src_port,
- OMAP_DMA_AMODE_CONSTANT,
- mcbsp->phys_base + OMAP_MCBSP_REG_DRR1,
- 0, 0);
-
- omap_set_dma_dest_params(mcbsp->dma_rx_lch,
- dest_port,
- OMAP_DMA_AMODE_POST_INC,
- buffer,
- 0, 0);
-
- omap_start_dma(mcbsp->dma_rx_lch);
- wait_for_completion(&mcbsp->rx_dma_completion);
-
- return 0;
-}
-EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
-
#ifdef CONFIG_ARCH_OMAP3
#define max_thres(m) (mcbsp->pdata->buffer_size)
#define valid_threshold(m, val) ((val) <= max_thres(m))
spin_lock_init(&mcbsp->lock);
mcbsp->id = id + 1;
mcbsp->free = true;
- mcbsp->dma_tx_lch = -1;
- mcbsp->dma_rx_lch = -1;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
if (!res) {
else
mcbsp->phys_dma_base = res->start;
- /* Default I/O is IRQ based */
- mcbsp->io_type = OMAP_MCBSP_IRQ_IO;
-
mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx");
mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx");
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