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serial: omap: drop DMA support
The current support is known to be broken and a later patch will come re-adding it using dma engine API. Tested-by: Shubhrajyoti D <shubhrajyoti@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felipe Balbi
Greg Kroah-Hartman
parent
d8ee4ea68f
commit
4945743047
@ -33,7 +33,6 @@
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/io.h>
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#include <linux/dma-mapping.h>
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#include <linux/clk.h>
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#include <linux/serial_core.h>
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#include <linux/irq.h>
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@ -41,7 +40,6 @@
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#include <linux/of.h>
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#include <linux/gpio.h>
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#include <plat/dma.h>
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#include <plat/dmtimer.h>
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#include <plat/omap-serial.h>
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@ -75,9 +73,6 @@
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static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
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/* Forward declaration of functions */
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static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
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static void serial_omap_rxdma_poll(unsigned long uart_no);
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static int serial_omap_start_rxdma(struct uart_omap_port *up);
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static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
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static struct workqueue_struct *serial_omap_uart_wq;
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@ -161,19 +156,6 @@ serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
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return port->uartclk/(baud * divisor);
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}
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static void serial_omap_stop_rxdma(struct uart_omap_port *up)
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{
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if (up->uart_dma.rx_dma_used) {
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del_timer(&up->uart_dma.rx_timer);
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omap_stop_dma(up->uart_dma.rx_dma_channel);
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omap_free_dma(up->uart_dma.rx_dma_channel);
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up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
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up->uart_dma.rx_dma_used = false;
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pm_runtime_mark_last_busy(up->dev);
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pm_runtime_put_autosuspend(up->dev);
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}
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}
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static void serial_omap_enable_ms(struct uart_port *port)
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{
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struct uart_omap_port *up = to_uart_omap_port(port);
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@ -189,22 +171,6 @@ static void serial_omap_enable_ms(struct uart_port *port)
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static void serial_omap_stop_tx(struct uart_port *port)
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{
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struct uart_omap_port *up = to_uart_omap_port(port);
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struct omap_uart_port_info *pdata = up->dev->platform_data;
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if (up->use_dma &&
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up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
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/*
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* Check if dma is still active. If yes do nothing,
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* return. Else stop dma
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*/
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if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
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return;
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omap_stop_dma(up->uart_dma.tx_dma_channel);
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omap_free_dma(up->uart_dma.tx_dma_channel);
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up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
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pm_runtime_mark_last_busy(up->dev);
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pm_runtime_put_autosuspend(up->dev);
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}
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pm_runtime_get_sync(up->dev);
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if (up->ier & UART_IER_THRI) {
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@ -212,8 +178,7 @@ static void serial_omap_stop_tx(struct uart_port *port)
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serial_out(up, UART_IER, up->ier);
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}
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if (!up->use_dma && pdata)
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serial_omap_set_forceidle(up);
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serial_omap_set_forceidle(up);
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pm_runtime_mark_last_busy(up->dev);
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pm_runtime_put_autosuspend(up->dev);
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@ -224,8 +189,6 @@ static void serial_omap_stop_rx(struct uart_port *port)
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struct uart_omap_port *up = to_uart_omap_port(port);
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pm_runtime_get_sync(up->dev);
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if (up->use_dma)
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serial_omap_stop_rxdma(up);
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up->ier &= ~UART_IER_RLSI;
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up->port.read_status_mask &= ~UART_LSR_DR;
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serial_out(up, UART_IER, up->ier);
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@ -343,67 +306,12 @@ static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
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static void serial_omap_start_tx(struct uart_port *port)
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{
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struct uart_omap_port *up = to_uart_omap_port(port);
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struct circ_buf *xmit;
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unsigned int start;
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int ret = 0;
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if (!up->use_dma) {
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pm_runtime_get_sync(up->dev);
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serial_omap_enable_ier_thri(up);
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serial_omap_set_noidle(up);
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pm_runtime_mark_last_busy(up->dev);
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pm_runtime_put_autosuspend(up->dev);
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return;
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}
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if (up->uart_dma.tx_dma_used)
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return;
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xmit = &up->port.state->xmit;
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if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) {
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pm_runtime_get_sync(up->dev);
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ret = omap_request_dma(up->uart_dma.uart_dma_tx,
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"UART Tx DMA",
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(void *)uart_tx_dma_callback, up,
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&(up->uart_dma.tx_dma_channel));
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if (ret < 0) {
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serial_omap_enable_ier_thri(up);
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return;
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}
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}
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spin_lock(&(up->uart_dma.tx_lock));
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up->uart_dma.tx_dma_used = true;
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spin_unlock(&(up->uart_dma.tx_lock));
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start = up->uart_dma.tx_buf_dma_phys +
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(xmit->tail & (UART_XMIT_SIZE - 1));
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up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
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/*
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* It is a circular buffer. See if the buffer has wounded back.
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* If yes it will have to be transferred in two separate dma
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* transfers
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*/
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if (start + up->uart_dma.tx_buf_size >=
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up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
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up->uart_dma.tx_buf_size =
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(up->uart_dma.tx_buf_dma_phys +
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UART_XMIT_SIZE) - start;
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omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
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OMAP_DMA_AMODE_CONSTANT,
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up->uart_dma.uart_base, 0, 0);
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omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
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OMAP_DMA_AMODE_POST_INC, start, 0, 0);
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omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
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OMAP_DMA_DATA_TYPE_S8,
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up->uart_dma.tx_buf_size, 1,
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OMAP_DMA_SYNC_ELEMENT,
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up->uart_dma.uart_dma_tx, 0);
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/* FIXME: Cache maintenance needed here? */
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omap_start_dma(up->uart_dma.tx_dma_channel);
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pm_runtime_get_sync(up->dev);
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serial_omap_enable_ier_thri(up);
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serial_omap_set_noidle(up);
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pm_runtime_mark_last_busy(up->dev);
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pm_runtime_put_autosuspend(up->dev);
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}
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static unsigned int check_modem_status(struct uart_omap_port *up)
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@ -456,16 +364,8 @@ static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
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spin_lock_irqsave(&up->port.lock, flags);
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lsr = serial_in(up, UART_LSR);
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if (iir & UART_IIR_RLSI) {
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if (!up->use_dma) {
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if (lsr & UART_LSR_DR)
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receive_chars(up, &lsr);
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} else {
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up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
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serial_out(up, UART_IER, up->ier);
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if ((serial_omap_start_rxdma(up) != 0) &&
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(lsr & UART_LSR_DR))
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receive_chars(up, &lsr);
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}
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if (lsr & UART_LSR_DR)
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receive_chars(up, &lsr);
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}
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check_modem_status(up);
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@ -616,20 +516,6 @@ static int serial_omap_startup(struct uart_port *port)
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spin_unlock_irqrestore(&up->port.lock, flags);
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up->msr_saved_flags = 0;
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if (up->use_dma) {
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free_page((unsigned long)up->port.state->xmit.buf);
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up->port.state->xmit.buf = dma_alloc_coherent(NULL,
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UART_XMIT_SIZE,
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(dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
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0);
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init_timer(&(up->uart_dma.rx_timer));
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up->uart_dma.rx_timer.function = serial_omap_rxdma_poll;
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up->uart_dma.rx_timer.data = up->port.line;
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/* Currently the buffer size is 4KB. Can increase it */
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up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
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up->uart_dma.rx_buf_size,
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(dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
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}
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/*
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* Finally, enable interrupts. Note: Modem status interrupts
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* are set via set_termios(), which will be occurring imminently
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@ -677,17 +563,6 @@ static void serial_omap_shutdown(struct uart_port *port)
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*/
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if (serial_in(up, UART_LSR) & UART_LSR_DR)
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(void) serial_in(up, UART_RX);
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if (up->use_dma) {
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dma_free_coherent(up->port.dev,
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UART_XMIT_SIZE, up->port.state->xmit.buf,
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up->uart_dma.tx_buf_dma_phys);
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up->port.state->xmit.buf = NULL;
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serial_omap_stop_rx(port);
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dma_free_coherent(up->port.dev,
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up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
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up->uart_dma.rx_buf_dma_phys);
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up->uart_dma.rx_buf = NULL;
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}
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pm_runtime_put(up->dev);
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free_irq(up->port.irq, up);
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@ -814,8 +689,6 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
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up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
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UART_FCR_ENABLE_FIFO;
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if (up->use_dma)
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up->fcr |= UART_FCR_DMA_SELECT;
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/*
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* Ok, we're now changing the port state. Do it with
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@ -891,14 +764,9 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
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up->scr |= OMAP_UART_SCR_RX_TRIG_GRANU1_MASK;
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if (up->use_dma) {
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serial_out(up, UART_TI752_TLR, 0);
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up->scr |= UART_FCR_TRIGGER_4;
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} else {
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/* Set receive FIFO threshold to 1 byte */
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up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
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up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT);
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}
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/* Set receive FIFO threshold to 1 byte */
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up->fcr &= ~OMAP_UART_FCR_RX_FIFO_TRIG_MASK;
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up->fcr |= (0x1 << OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT);
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serial_out(up, UART_FCR, up->fcr);
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serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
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@ -1267,149 +1135,6 @@ static int serial_omap_resume(struct device *dev)
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}
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#endif
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static void serial_omap_rxdma_poll(unsigned long uart_no)
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{
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struct uart_omap_port *up = ui[uart_no];
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unsigned int curr_dma_pos, curr_transmitted_size;
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int ret = 0;
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curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
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if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
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(curr_dma_pos == 0)) {
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if (jiffies_to_msecs(jiffies - up->port_activity) <
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up->uart_dma.rx_timeout) {
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mod_timer(&up->uart_dma.rx_timer, jiffies +
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usecs_to_jiffies(up->uart_dma.rx_poll_rate));
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} else {
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serial_omap_stop_rxdma(up);
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up->ier |= (UART_IER_RDI | UART_IER_RLSI);
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serial_out(up, UART_IER, up->ier);
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}
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return;
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}
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curr_transmitted_size = curr_dma_pos -
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up->uart_dma.prev_rx_dma_pos;
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up->port.icount.rx += curr_transmitted_size;
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tty_insert_flip_string(up->port.state->port.tty,
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up->uart_dma.rx_buf +
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(up->uart_dma.prev_rx_dma_pos -
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up->uart_dma.rx_buf_dma_phys),
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curr_transmitted_size);
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tty_flip_buffer_push(up->port.state->port.tty);
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up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
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if (up->uart_dma.rx_buf_size +
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up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
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ret = serial_omap_start_rxdma(up);
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if (ret < 0) {
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serial_omap_stop_rxdma(up);
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up->ier |= (UART_IER_RDI | UART_IER_RLSI);
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serial_out(up, UART_IER, up->ier);
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}
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} else {
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mod_timer(&up->uart_dma.rx_timer, jiffies +
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usecs_to_jiffies(up->uart_dma.rx_poll_rate));
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}
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up->port_activity = jiffies;
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}
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static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
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{
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return;
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}
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static int serial_omap_start_rxdma(struct uart_omap_port *up)
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{
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int ret = 0;
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if (up->uart_dma.rx_dma_channel == -1) {
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pm_runtime_get_sync(up->dev);
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ret = omap_request_dma(up->uart_dma.uart_dma_rx,
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"UART Rx DMA",
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(void *)uart_rx_dma_callback, up,
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&(up->uart_dma.rx_dma_channel));
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if (ret < 0)
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return ret;
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omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
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OMAP_DMA_AMODE_CONSTANT,
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up->uart_dma.uart_base, 0, 0);
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omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
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OMAP_DMA_AMODE_POST_INC,
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up->uart_dma.rx_buf_dma_phys, 0, 0);
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omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
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OMAP_DMA_DATA_TYPE_S8,
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up->uart_dma.rx_buf_size, 1,
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OMAP_DMA_SYNC_ELEMENT,
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up->uart_dma.uart_dma_rx, 0);
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}
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up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
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/* FIXME: Cache maintenance needed here? */
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omap_start_dma(up->uart_dma.rx_dma_channel);
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mod_timer(&up->uart_dma.rx_timer, jiffies +
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usecs_to_jiffies(up->uart_dma.rx_poll_rate));
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up->uart_dma.rx_dma_used = true;
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return ret;
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}
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static void serial_omap_continue_tx(struct uart_omap_port *up)
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{
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struct circ_buf *xmit = &up->port.state->xmit;
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unsigned int start = up->uart_dma.tx_buf_dma_phys
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+ (xmit->tail & (UART_XMIT_SIZE - 1));
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if (uart_circ_empty(xmit))
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return;
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up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
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/*
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* It is a circular buffer. See if the buffer has wounded back.
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* If yes it will have to be transferred in two separate dma
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* transfers
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*/
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if (start + up->uart_dma.tx_buf_size >=
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up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
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up->uart_dma.tx_buf_size =
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(up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
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omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
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OMAP_DMA_AMODE_CONSTANT,
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up->uart_dma.uart_base, 0, 0);
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omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
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OMAP_DMA_AMODE_POST_INC, start, 0, 0);
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omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
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OMAP_DMA_DATA_TYPE_S8,
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up->uart_dma.tx_buf_size, 1,
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OMAP_DMA_SYNC_ELEMENT,
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up->uart_dma.uart_dma_tx, 0);
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/* FIXME: Cache maintenance needed here? */
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omap_start_dma(up->uart_dma.tx_dma_channel);
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}
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static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
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{
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struct uart_omap_port *up = data;
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struct circ_buf *xmit = &up->port.state->xmit;
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xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
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(UART_XMIT_SIZE - 1);
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up->port.icount.tx += up->uart_dma.tx_buf_size;
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&up->port);
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if (uart_circ_empty(xmit)) {
|
||||
spin_lock(&(up->uart_dma.tx_lock));
|
||||
serial_omap_stop_tx(&up->port);
|
||||
up->uart_dma.tx_dma_used = false;
|
||||
spin_unlock(&(up->uart_dma.tx_lock));
|
||||
} else {
|
||||
omap_stop_dma(up->uart_dma.tx_dma_channel);
|
||||
serial_omap_continue_tx(up);
|
||||
}
|
||||
up->port_activity = jiffies;
|
||||
return;
|
||||
}
|
||||
|
||||
static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
|
||||
{
|
||||
u32 mvr, scheme;
|
||||
@ -1479,7 +1204,7 @@ static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
|
||||
static int serial_omap_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct uart_omap_port *up;
|
||||
struct resource *mem, *irq, *dma_tx, *dma_rx;
|
||||
struct resource *mem, *irq;
|
||||
struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
|
||||
int ret;
|
||||
|
||||
@ -1504,14 +1229,6 @@ static int serial_omap_probe(struct platform_device *pdev)
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
|
||||
if (!dma_rx)
|
||||
return -ENXIO;
|
||||
|
||||
dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
|
||||
if (!dma_tx)
|
||||
return -ENXIO;
|
||||
|
||||
if (gpio_is_valid(omap_up_info->DTR_gpio) &&
|
||||
omap_up_info->DTR_present) {
|
||||
ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
|
||||
@ -1574,20 +1291,6 @@ static int serial_omap_probe(struct platform_device *pdev)
|
||||
dev_warn(&pdev->dev, "No clock speed specified: using default:"
|
||||
"%d\n", DEFAULT_CLK_SPEED);
|
||||
}
|
||||
up->uart_dma.uart_base = mem->start;
|
||||
|
||||
if (omap_up_info->dma_enabled) {
|
||||
up->uart_dma.uart_dma_tx = dma_tx->start;
|
||||
up->uart_dma.uart_dma_rx = dma_rx->start;
|
||||
up->use_dma = 1;
|
||||
up->uart_dma.rx_buf_size = omap_up_info->dma_rx_buf_size;
|
||||
up->uart_dma.rx_timeout = omap_up_info->dma_rx_timeout;
|
||||
up->uart_dma.rx_poll_rate = omap_up_info->dma_rx_poll_rate;
|
||||
spin_lock_init(&(up->uart_dma.tx_lock));
|
||||
spin_lock_init(&(up->uart_dma.rx_lock));
|
||||
up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
|
||||
up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
|
||||
}
|
||||
|
||||
up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
|
||||
up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
|
||||
@ -1730,10 +1433,6 @@ static int serial_omap_runtime_suspend(struct device *dev)
|
||||
}
|
||||
}
|
||||
|
||||
/* Errata i291 */
|
||||
if (up->use_dma && (up->errata & UART_ERRATA_i291_DMA_FORCEIDLE))
|
||||
serial_omap_set_forceidle(up);
|
||||
|
||||
up->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
|
||||
schedule_work(&up->qos_work);
|
||||
|
||||
@ -1751,11 +1450,6 @@ static int serial_omap_runtime_resume(struct device *dev)
|
||||
if (up->context_loss_cnt != loss_cnt)
|
||||
serial_omap_restore_context(up);
|
||||
|
||||
/* Errata i291 */
|
||||
if ((up->errata & UART_ERRATA_i291_DMA_FORCEIDLE) &&
|
||||
up->use_dma)
|
||||
serial_omap_set_noidle(up);
|
||||
|
||||
up->latency = up->calc_latency;
|
||||
schedule_work(&up->qos_work);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user