diff options
author | Jarkko Nikula <jhnikula@gmail.com> | 2011-06-14 11:23:52 +0000 |
---|---|---|
committer | Tony Lindgren <tony@atomide.com> | 2011-06-29 03:28:59 -0700 |
commit | bafe2721a0fbd1cc1af04384133684f660f3658e (patch) | |
tree | c9b90a6f86284eefc17fcf6520c73ad05d01382d /arch/arm/plat-omap/mcbsp.c | |
parent | e285bca6d926b17ad6343f20ef174799785e4235 (diff) | |
download | linux-bafe2721a0fbd1cc1af04384133684f660f3658e.tar.bz2 |
omap: mcbsp: Drop in-driver transfer support
We haven't seen either use for in-driver transfer API in McBSP driver
over the years so it looks they can be removed too.
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/plat-omap/mcbsp.c')
-rw-r--r-- | arch/arm/plat-omap/mcbsp.c | 382 |
1 files changed, 19 insertions, 363 deletions
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c index 1de27243385f..455eadcd820c 100644 --- a/arch/arm/plat-omap/mcbsp.c +++ b/arch/arm/plat-omap/mcbsp.c @@ -16,8 +16,6 @@ #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> @@ -25,7 +23,6 @@ #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> @@ -136,8 +133,6 @@ static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id) 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; @@ -156,41 +151,11 @@ static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id) 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. @@ -758,37 +723,6 @@ static inline void omap_st_start(struct omap_mcbsp *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; @@ -833,29 +767,24 @@ int omap_mcbsp_request(unsigned int id) 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; } } @@ -901,12 +830,9 @@ void omap_mcbsp_free(unsigned int id) 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; @@ -1043,271 +969,6 @@ void omap_mcbsp_stop(unsigned int id, int tx, int rx) } 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)) @@ -1619,8 +1280,6 @@ static int __devinit omap_mcbsp_probe(struct platform_device *pdev) 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) { @@ -1646,9 +1305,6 @@ static int __devinit omap_mcbsp_probe(struct platform_device *pdev) 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"); |