serial: sprd: Add DMA mode support
Add DMA mode support for the Spreadtrum serial controller. Signed-off-by: Lanqing Liu <lanqing.liu@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lanqing Liu
Greg Kroah-Hartman
parent
083206100d
commit
f4487db58e
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@ -10,6 +10,9 @@
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#include <linux/clk.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma/sprd-dma.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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@ -75,6 +78,7 @@
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/* control register 1 */
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#define SPRD_CTL1 0x001C
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#define SPRD_DMA_EN BIT(15)
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#define RX_HW_FLOW_CTL_THLD BIT(6)
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#define RX_HW_FLOW_CTL_EN BIT(7)
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#define TX_HW_FLOW_CTL_EN BIT(8)
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@ -86,6 +90,7 @@
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#define THLD_TX_EMPTY 0x40
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#define THLD_TX_EMPTY_SHIFT 8
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#define THLD_RX_FULL 0x40
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#define THLD_RX_FULL_MASK GENMASK(6, 0)
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/* config baud rate register */
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#define SPRD_CLKD0 0x0024
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@ -102,15 +107,36 @@
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#define SPRD_IMSR_TIMEOUT BIT(13)
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#define SPRD_DEFAULT_SOURCE_CLK 26000000
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#define SPRD_RX_DMA_STEP 1
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#define SPRD_RX_FIFO_FULL 1
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#define SPRD_TX_FIFO_FULL 0x20
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#define SPRD_UART_RX_SIZE (UART_XMIT_SIZE / 4)
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struct sprd_uart_dma {
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struct dma_chan *chn;
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unsigned char *virt;
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dma_addr_t phys_addr;
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dma_cookie_t cookie;
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u32 trans_len;
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bool enable;
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};
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struct sprd_uart_port {
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struct uart_port port;
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char name[16];
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struct clk *clk;
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struct sprd_uart_dma tx_dma;
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struct sprd_uart_dma rx_dma;
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dma_addr_t pos;
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unsigned char *rx_buf_tail;
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};
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static struct sprd_uart_port *sprd_port[UART_NR_MAX];
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static int sprd_ports_num;
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static int sprd_start_dma_rx(struct uart_port *port);
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static int sprd_tx_dma_config(struct uart_port *port);
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static inline unsigned int serial_in(struct uart_port *port,
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unsigned int offset)
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{
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@ -141,35 +167,15 @@ static void sprd_set_mctrl(struct uart_port *port, unsigned int mctrl)
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/* nothing to do */
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}
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static void sprd_stop_tx(struct uart_port *port)
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{
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unsigned int ien, iclr;
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iclr = serial_in(port, SPRD_ICLR);
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ien = serial_in(port, SPRD_IEN);
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iclr |= SPRD_IEN_TX_EMPTY;
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ien &= ~SPRD_IEN_TX_EMPTY;
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serial_out(port, SPRD_ICLR, iclr);
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serial_out(port, SPRD_IEN, ien);
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}
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static void sprd_start_tx(struct uart_port *port)
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{
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unsigned int ien;
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ien = serial_in(port, SPRD_IEN);
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if (!(ien & SPRD_IEN_TX_EMPTY)) {
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ien |= SPRD_IEN_TX_EMPTY;
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serial_out(port, SPRD_IEN, ien);
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}
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}
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static void sprd_stop_rx(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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unsigned int ien, iclr;
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if (sp->rx_dma.enable)
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dmaengine_terminate_all(sp->rx_dma.chn);
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iclr = serial_in(port, SPRD_ICLR);
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ien = serial_in(port, SPRD_IEN);
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@ -180,6 +186,370 @@ static void sprd_stop_rx(struct uart_port *port)
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serial_out(port, SPRD_ICLR, iclr);
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}
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static void sprd_uart_dma_enable(struct uart_port *port, bool enable)
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{
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u32 val = serial_in(port, SPRD_CTL1);
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if (enable)
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val |= SPRD_DMA_EN;
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else
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val &= ~SPRD_DMA_EN;
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serial_out(port, SPRD_CTL1, val);
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}
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static void sprd_stop_tx_dma(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct circ_buf *xmit = &port->state->xmit;
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struct dma_tx_state state;
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u32 trans_len;
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dmaengine_pause(sp->tx_dma.chn);
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dmaengine_tx_status(sp->tx_dma.chn, sp->tx_dma.cookie, &state);
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if (state.residue) {
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trans_len = state.residue - sp->tx_dma.phys_addr;
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xmit->tail = (xmit->tail + trans_len) & (UART_XMIT_SIZE - 1);
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port->icount.tx += trans_len;
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dma_unmap_single(port->dev, sp->tx_dma.phys_addr,
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sp->tx_dma.trans_len, DMA_TO_DEVICE);
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}
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dmaengine_terminate_all(sp->tx_dma.chn);
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sp->tx_dma.trans_len = 0;
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}
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static int sprd_tx_buf_remap(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct circ_buf *xmit = &port->state->xmit;
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sp->tx_dma.trans_len =
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CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
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sp->tx_dma.phys_addr = dma_map_single(port->dev,
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(void *)&(xmit->buf[xmit->tail]),
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sp->tx_dma.trans_len,
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DMA_TO_DEVICE);
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return dma_mapping_error(port->dev, sp->tx_dma.phys_addr);
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}
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static void sprd_complete_tx_dma(void *data)
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{
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struct uart_port *port = (struct uart_port *)data;
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct circ_buf *xmit = &port->state->xmit;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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dma_unmap_single(port->dev, sp->tx_dma.phys_addr,
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sp->tx_dma.trans_len, DMA_TO_DEVICE);
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xmit->tail = (xmit->tail + sp->tx_dma.trans_len) & (UART_XMIT_SIZE - 1);
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port->icount.tx += sp->tx_dma.trans_len;
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(port);
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if (uart_circ_empty(xmit) || sprd_tx_buf_remap(port) ||
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sprd_tx_dma_config(port))
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sp->tx_dma.trans_len = 0;
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static int sprd_uart_dma_submit(struct uart_port *port,
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struct sprd_uart_dma *ud, u32 trans_len,
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enum dma_transfer_direction direction,
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dma_async_tx_callback callback)
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{
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struct dma_async_tx_descriptor *dma_des;
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unsigned long flags;
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flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE,
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SPRD_DMA_NO_TRG,
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SPRD_DMA_FRAG_REQ,
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SPRD_DMA_TRANS_INT);
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dma_des = dmaengine_prep_slave_single(ud->chn, ud->phys_addr, trans_len,
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direction, flags);
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if (!dma_des)
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return -ENODEV;
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dma_des->callback = callback;
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dma_des->callback_param = port;
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ud->cookie = dmaengine_submit(dma_des);
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if (dma_submit_error(ud->cookie))
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return dma_submit_error(ud->cookie);
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dma_async_issue_pending(ud->chn);
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return 0;
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}
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static int sprd_tx_dma_config(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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u32 burst = sp->tx_dma.trans_len > SPRD_TX_FIFO_FULL ?
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SPRD_TX_FIFO_FULL : sp->tx_dma.trans_len;
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int ret;
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struct dma_slave_config cfg = {
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.dst_addr = port->mapbase + SPRD_TXD,
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.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.src_maxburst = burst,
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};
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ret = dmaengine_slave_config(sp->tx_dma.chn, &cfg);
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if (ret < 0)
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return ret;
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return sprd_uart_dma_submit(port, &sp->tx_dma, sp->tx_dma.trans_len,
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DMA_MEM_TO_DEV, sprd_complete_tx_dma);
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}
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static void sprd_start_tx_dma(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct circ_buf *xmit = &port->state->xmit;
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if (port->x_char) {
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serial_out(port, SPRD_TXD, port->x_char);
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port->icount.tx++;
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port->x_char = 0;
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return;
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}
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if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
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sprd_stop_tx_dma(port);
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return;
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}
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if (sp->tx_dma.trans_len)
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return;
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if (sprd_tx_buf_remap(port) || sprd_tx_dma_config(port))
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sp->tx_dma.trans_len = 0;
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}
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static void sprd_rx_full_thld(struct uart_port *port, u32 thld)
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{
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u32 val = serial_in(port, SPRD_CTL2);
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val &= ~THLD_RX_FULL_MASK;
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val |= thld & THLD_RX_FULL_MASK;
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serial_out(port, SPRD_CTL2, val);
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}
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static int sprd_rx_alloc_buf(struct sprd_uart_port *sp)
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{
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sp->rx_dma.virt = dma_alloc_coherent(sp->port.dev, SPRD_UART_RX_SIZE,
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&sp->rx_dma.phys_addr, GFP_KERNEL);
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if (!sp->rx_dma.virt)
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return -ENOMEM;
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return 0;
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}
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static void sprd_rx_free_buf(struct sprd_uart_port *sp)
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{
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if (sp->rx_dma.virt)
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dma_free_coherent(sp->port.dev, SPRD_UART_RX_SIZE,
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sp->rx_dma.virt, sp->rx_dma.phys_addr);
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}
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static int sprd_rx_dma_config(struct uart_port *port, u32 burst)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct dma_slave_config cfg = {
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.src_addr = port->mapbase + SPRD_RXD,
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.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
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.src_maxburst = burst,
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};
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return dmaengine_slave_config(sp->rx_dma.chn, &cfg);
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}
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static void sprd_uart_dma_rx(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct tty_port *tty = &port->state->port;
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port->icount.rx += sp->rx_dma.trans_len;
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tty_insert_flip_string(tty, sp->rx_buf_tail, sp->rx_dma.trans_len);
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tty_flip_buffer_push(tty);
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}
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static void sprd_uart_dma_irq(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct dma_tx_state state;
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enum dma_status status;
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status = dmaengine_tx_status(sp->rx_dma.chn,
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sp->rx_dma.cookie, &state);
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if (status == DMA_ERROR)
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sprd_stop_rx(port);
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if (!state.residue && sp->pos == sp->rx_dma.phys_addr)
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return;
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if (!state.residue) {
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sp->rx_dma.trans_len = SPRD_UART_RX_SIZE +
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sp->rx_dma.phys_addr - sp->pos;
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sp->pos = sp->rx_dma.phys_addr;
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} else {
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sp->rx_dma.trans_len = state.residue - sp->pos;
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sp->pos = state.residue;
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}
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sprd_uart_dma_rx(port);
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sp->rx_buf_tail += sp->rx_dma.trans_len;
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}
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static void sprd_complete_rx_dma(void *data)
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{
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struct uart_port *port = (struct uart_port *)data;
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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struct dma_tx_state state;
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enum dma_status status;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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status = dmaengine_tx_status(sp->rx_dma.chn,
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sp->rx_dma.cookie, &state);
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if (status != DMA_COMPLETE) {
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sprd_stop_rx(port);
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spin_unlock_irqrestore(&port->lock, flags);
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return;
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}
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if (sp->pos != sp->rx_dma.phys_addr) {
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sp->rx_dma.trans_len = SPRD_UART_RX_SIZE +
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sp->rx_dma.phys_addr - sp->pos;
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sprd_uart_dma_rx(port);
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sp->rx_buf_tail += sp->rx_dma.trans_len;
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}
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if (sprd_start_dma_rx(port))
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sprd_stop_rx(port);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static int sprd_start_dma_rx(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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int ret;
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if (!sp->rx_dma.enable)
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return 0;
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sp->pos = sp->rx_dma.phys_addr;
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sp->rx_buf_tail = sp->rx_dma.virt;
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sprd_rx_full_thld(port, SPRD_RX_FIFO_FULL);
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ret = sprd_rx_dma_config(port, SPRD_RX_DMA_STEP);
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if (ret)
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return ret;
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return sprd_uart_dma_submit(port, &sp->rx_dma, SPRD_UART_RX_SIZE,
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DMA_DEV_TO_MEM, sprd_complete_rx_dma);
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}
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static void sprd_release_dma(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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sprd_uart_dma_enable(port, false);
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if (sp->rx_dma.enable)
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dma_release_channel(sp->rx_dma.chn);
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if (sp->tx_dma.enable)
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dma_release_channel(sp->tx_dma.chn);
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sp->tx_dma.enable = false;
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sp->rx_dma.enable = false;
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}
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static void sprd_request_dma(struct uart_port *port)
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{
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struct sprd_uart_port *sp =
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container_of(port, struct sprd_uart_port, port);
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sp->tx_dma.enable = true;
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sp->rx_dma.enable = true;
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sp->tx_dma.chn = dma_request_chan(port->dev, "tx");
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if (IS_ERR(sp->tx_dma.chn)) {
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dev_err(port->dev, "request TX DMA channel failed, ret = %ld\n",
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PTR_ERR(sp->tx_dma.chn));
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sp->tx_dma.enable = false;
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}
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sp->rx_dma.chn = dma_request_chan(port->dev, "rx");
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if (IS_ERR(sp->rx_dma.chn)) {
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dev_err(port->dev, "request RX DMA channel failed, ret = %ld\n",
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PTR_ERR(sp->tx_dma.chn));
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sp->rx_dma.enable = false;
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}
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}
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static void sprd_stop_tx(struct uart_port *port)
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{
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struct sprd_uart_port *sp = container_of(port, struct sprd_uart_port,
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port);
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unsigned int ien, iclr;
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if (sp->tx_dma.enable) {
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sprd_stop_tx_dma(port);
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return;
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}
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iclr = serial_in(port, SPRD_ICLR);
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ien = serial_in(port, SPRD_IEN);
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iclr |= SPRD_IEN_TX_EMPTY;
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ien &= ~SPRD_IEN_TX_EMPTY;
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serial_out(port, SPRD_IEN, ien);
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serial_out(port, SPRD_ICLR, iclr);
|
||||
}
|
||||
|
||||
static void sprd_start_tx(struct uart_port *port)
|
||||
{
|
||||
struct sprd_uart_port *sp = container_of(port, struct sprd_uart_port,
|
||||
port);
|
||||
unsigned int ien;
|
||||
|
||||
if (sp->tx_dma.enable) {
|
||||
sprd_start_tx_dma(port);
|
||||
return;
|
||||
}
|
||||
|
||||
ien = serial_in(port, SPRD_IEN);
|
||||
if (!(ien & SPRD_IEN_TX_EMPTY)) {
|
||||
ien |= SPRD_IEN_TX_EMPTY;
|
||||
serial_out(port, SPRD_IEN, ien);
|
||||
}
|
||||
}
|
||||
|
||||
/* The Sprd serial does not support this function. */
|
||||
static void sprd_break_ctl(struct uart_port *port, int break_state)
|
||||
{
|
||||
|
|
@ -220,9 +590,16 @@ static int handle_lsr_errors(struct uart_port *port,
|
|||
|
||||
static inline void sprd_rx(struct uart_port *port)
|
||||
{
|
||||
struct sprd_uart_port *sp = container_of(port, struct sprd_uart_port,
|
||||
port);
|
||||
struct tty_port *tty = &port->state->port;
|
||||
unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT;
|
||||
|
||||
if (sp->rx_dma.enable) {
|
||||
sprd_uart_dma_irq(port);
|
||||
return;
|
||||
}
|
||||
|
||||
while ((serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK) &&
|
||||
max_count--) {
|
||||
lsr = serial_in(port, SPRD_LSR);
|
||||
|
|
@ -306,6 +683,25 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
|
|||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static void sprd_uart_dma_startup(struct uart_port *port,
|
||||
struct sprd_uart_port *sp)
|
||||
{
|
||||
int ret;
|
||||
|
||||
sprd_request_dma(port);
|
||||
if (!(sp->rx_dma.enable || sp->tx_dma.enable))
|
||||
return;
|
||||
|
||||
ret = sprd_start_dma_rx(port);
|
||||
if (ret) {
|
||||
sp->rx_dma.enable = false;
|
||||
dma_release_channel(sp->rx_dma.chn);
|
||||
dev_warn(port->dev, "fail to start RX dma mode\n");
|
||||
}
|
||||
|
||||
sprd_uart_dma_enable(port, true);
|
||||
}
|
||||
|
||||
static int sprd_startup(struct uart_port *port)
|
||||
{
|
||||
int ret = 0;
|
||||
|
|
@ -334,6 +730,9 @@ static int sprd_startup(struct uart_port *port)
|
|||
/* allocate irq */
|
||||
sp = container_of(port, struct sprd_uart_port, port);
|
||||
snprintf(sp->name, sizeof(sp->name), "sprd_serial%d", port->line);
|
||||
|
||||
sprd_uart_dma_startup(port, sp);
|
||||
|
||||
ret = devm_request_irq(port->dev, port->irq, sprd_handle_irq,
|
||||
IRQF_SHARED, sp->name, port);
|
||||
if (ret) {
|
||||
|
|
@ -348,7 +747,9 @@ static int sprd_startup(struct uart_port *port)
|
|||
/* enable interrupt */
|
||||
spin_lock_irqsave(&port->lock, flags);
|
||||
ien = serial_in(port, SPRD_IEN);
|
||||
ien |= SPRD_IEN_RX_FULL | SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT;
|
||||
ien |= SPRD_IEN_BREAK_DETECT | SPRD_IEN_TIMEOUT;
|
||||
if (!sp->rx_dma.enable)
|
||||
ien |= SPRD_IEN_RX_FULL;
|
||||
serial_out(port, SPRD_IEN, ien);
|
||||
spin_unlock_irqrestore(&port->lock, flags);
|
||||
|
||||
|
|
@ -357,6 +758,7 @@ static int sprd_startup(struct uart_port *port)
|
|||
|
||||
static void sprd_shutdown(struct uart_port *port)
|
||||
{
|
||||
sprd_release_dma(port);
|
||||
serial_out(port, SPRD_IEN, 0);
|
||||
serial_out(port, SPRD_ICLR, ~0);
|
||||
devm_free_irq(port->dev, port->irq, port);
|
||||
|
|
@ -687,6 +1089,8 @@ static int sprd_remove(struct platform_device *dev)
|
|||
if (!sprd_ports_num)
|
||||
uart_unregister_driver(&sprd_uart_driver);
|
||||
|
||||
sprd_rx_free_buf(sup);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -775,6 +1179,14 @@ static int sprd_probe(struct platform_device *pdev)
|
|||
}
|
||||
up->irq = irq;
|
||||
|
||||
/*
|
||||
* Allocate one dma buffer to prepare for receive transfer, in case
|
||||
* memory allocation failure at runtime.
|
||||
*/
|
||||
ret = sprd_rx_alloc_buf(sprd_port[index]);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (!sprd_ports_num) {
|
||||
ret = uart_register_driver(&sprd_uart_driver);
|
||||
if (ret < 0) {
|
||||
|
|
|
|||
Loading…
Reference in New Issue