From 1d26c9ff420f647df4a7a3e9a28736b9cff6359a Mon Sep 17 00:00:00 2001 From: Qipan Li Date: Tue, 14 Jul 2015 00:52:22 +0000 Subject: serial: sirf: workaround rx process to avoid possible data loss when UART works in DMA mode and left bytes in rx fifo less than a dma transfer unit, DMA engine can't transfer the bytes out to rx DMA buffer. so it need a way to fetch them out and flush them into tty buffer in time. in the above case, we want UART switch from DMA mode to PIO mode and fetch && flush bytes into tty layer buffer until rxfifo become empty, after that done let UART switch from PIO mode back to DMA mode. (record as method1) method1 result in the next receive result wrong. for example in PIO part of method1, we fetched && pushed X1...X3 bytes, when UART rxfifo newly received Y1...Y4 bytes, UART trigger a DMA unit transfer, the DMA unit's content is X1...X3Y1 and rxfifo fifo status is empty, so X1X2X3 pushed twice by PIO way and DMA way also the bytes Y2Y3Y4 missed. add rxfifo reset operation before UART switch back to DMA mode would resolve the issue. ([method1 + do fifo reset] record as method2) before the commit, UART driver use method2. but methd2 have a risk of data loss, as if UART's shift register receive a complete byte and transfer it into rxfifo before rxfifo reset operation the byte will loss. UART and USP have the similar bits CLEAR_RX_ADDR_EN(uart)/FRADDR_CLR_EN(usp), When found UART controller changing I/O to DMA mode, UART controller clears the two low bits of read point (rx_fifo_addr[1:0]). when enable the bit + method1(record as method3), in above example the DMA unit's content is X1...X3Y1 and there are Y2Y3Y4 in rxfifo by experiment, we just push bytes in rx DMA buffer. BTW, the workaround works only for UART receive DMA channel use SINGLE DMA mode. Signed-off-by: Qipan Li Signed-off-by: Barry Song Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sirfsoc_uart.c | 80 ++++++++++++++++++++++++++++++--------- drivers/tty/serial/sirfsoc_uart.h | 4 ++ 2 files changed, 66 insertions(+), 18 deletions(-) (limited to 'drivers') diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c index 653cdd5fb508..8cac7ac497e8 100644 --- a/drivers/tty/serial/sirfsoc_uart.c +++ b/drivers/tty/serial/sirfsoc_uart.c @@ -886,9 +886,13 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, else wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE); if (sirfport->rx_dma_chan) - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_DMA_MODE); + wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, + rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & + ~SIRFUART_IO_MODE); else - wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_IO_MODE); + wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, + rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | + SIRFUART_IO_MODE); sirfport->rx_period_time = 20000000; /* Reset Rx/Tx FIFO Threshold level for proper baudrate */ if (set_baud < 1000000) @@ -958,9 +962,9 @@ static int sirfsoc_uart_startup(struct uart_port *port) wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port)); if (sirfport->rx_dma_chan) wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk, - SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) | - SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) | - SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b)); + SIRFUART_RX_FIFO_CHK_SC(port->line, 0x1) | + SIRFUART_RX_FIFO_CHK_LC(port->line, 0x2) | + SIRFUART_RX_FIFO_CHK_HC(port->line, 0x4)); if (sirfport->tx_dma_chan) { sirfport->tx_dma_state = TX_DMA_IDLE; wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk, @@ -981,10 +985,21 @@ static int sirfsoc_uart_startup(struct uart_port *port) goto init_rx_err; } } + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART && + sirfport->rx_dma_chan) + wr_regl(port, ureg->sirfsoc_swh_dma_io, + SIRFUART_CLEAR_RX_ADDR_EN); + if (sirfport->uart_reg->uart_type == SIRF_USP_UART && + sirfport->rx_dma_chan) + wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, + rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | + SIRFSOC_USP_FRADDR_CLR_EN); enable_irq(port->irq); if (sirfport->rx_dma_chan && !sirfport->is_hrt_enabled) { sirfport->is_hrt_enabled = true; sirfport->rx_period_time = 20000000; + sirfport->rx_last_pos = -1; + sirfport->pio_fetch_cnt = 0; sirfport->rx_dma_items.xmit.tail = sirfport->rx_dma_items.xmit.head = 0; hrtimer_start(&sirfport->hrt, @@ -1003,6 +1018,9 @@ static void sirfsoc_uart_shutdown(struct uart_port *port) { struct sirfsoc_uart_port *sirfport = to_sirfport(port); struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; + struct circ_buf *xmit; + + xmit = &sirfport->rx_dma_items.xmit; if (!sirfport->is_atlas7) wr_regl(port, ureg->sirfsoc_int_en_reg, 0); else @@ -1019,8 +1037,10 @@ static void sirfsoc_uart_shutdown(struct uart_port *port) if (sirfport->tx_dma_chan) sirfport->tx_dma_state = TX_DMA_IDLE; if (sirfport->rx_dma_chan && sirfport->is_hrt_enabled) { - while ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - SIRFUART_RX_FIFO_MASK) > 0) + while (((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & + SIRFUART_RX_FIFO_MASK) > sirfport->pio_fetch_cnt) && + !CIRC_CNT(xmit->head, xmit->tail, + SIRFSOC_RX_DMA_BUF_SIZE)) ; sirfport->is_hrt_enabled = false; hrtimer_cancel(&sirfport->hrt); @@ -1169,6 +1189,8 @@ static enum hrtimer_restart struct tty_struct *tty; struct sirfsoc_register *ureg; struct circ_buf *xmit; + struct sirfsoc_fifo_status *ufifo_st; + int max_pio_cnt; sirfport = container_of(hrt, struct sirfsoc_uart_port, hrt); port = &sirfport->port; @@ -1176,9 +1198,16 @@ static enum hrtimer_restart tty = port->state->port.tty; ureg = &sirfport->uart_reg->uart_reg; xmit = &sirfport->rx_dma_items.xmit; + ufifo_st = &sirfport->uart_reg->fifo_status; + dmaengine_tx_status(sirfport->rx_dma_chan, - sirfport->rx_dma_items.cookie, &tx_state); - xmit->head = SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue; + sirfport->rx_dma_items.cookie, &tx_state); + if (SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue != + sirfport->rx_last_pos) { + xmit->head = SIRFSOC_RX_DMA_BUF_SIZE - tx_state.residue; + sirfport->rx_last_pos = xmit->head; + sirfport->pio_fetch_cnt = 0; + } count = CIRC_CNT_TO_END(xmit->head, xmit->tail, SIRFSOC_RX_DMA_BUF_SIZE); while (count > 0) { @@ -1200,23 +1229,38 @@ static enum hrtimer_restart */ if (!inserted && !count && ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - SIRFUART_RX_FIFO_MASK) > 0)) { + SIRFUART_RX_FIFO_MASK) > sirfport->pio_fetch_cnt)) { + dmaengine_pause(sirfport->rx_dma_chan); /* switch to pio mode */ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) | SIRFUART_IO_MODE); - while ((rd_regl(port, ureg->sirfsoc_rx_fifo_status) & - SIRFUART_RX_FIFO_MASK) > 0) { - if (sirfsoc_uart_pio_rx_chars(port, 16) > 0) - tty_flip_buffer_push(tty->port); + /* + * UART controller SWH_DMA_IO register have CLEAR_RX_ADDR_EN + * When found changing I/O to DMA mode, it clears + * two low bits of read point; + * USP have similar FRADDR_CLR_EN bit in USP_RX_DMA_IO_CTRL. + * Fetch data out from rxfifo into DMA buffer in PIO mode, + * while switch back to DMA mode, the data fetched will override + * by DMA, as hardware have a strange behaviour: + * after switch back to DMA mode, check rxfifo status it will + * be the number PIO fetched, so record the fetched data count + * to avoid the repeated fetch + */ + max_pio_cnt = 3; + while (!(rd_regl(port, ureg->sirfsoc_rx_fifo_status) & + ufifo_st->ff_empty(port)) && max_pio_cnt--) { + xmit->buf[xmit->head] = + rd_regl(port, ureg->sirfsoc_rx_fifo_data); + xmit->head = (xmit->head + 1) & + (SIRFSOC_RX_DMA_BUF_SIZE - 1); + sirfport->pio_fetch_cnt++; } - wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET); - wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0); - wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START); /* switch back to dma mode */ wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) & ~SIRFUART_IO_MODE); + dmaengine_resume(sirfport->rx_dma_chan); } next_hrt: hrtimer_forward_now(hrt, ns_to_ktime(sirfport->rx_period_time)); @@ -1239,7 +1283,7 @@ static int sirfsoc_uart_probe(struct platform_device *pdev) struct resource *res; int ret; struct dma_slave_config slv_cfg = { - .src_maxburst = 2, + .src_maxburst = 1, }; struct dma_slave_config tx_slv_cfg = { .dst_maxburst = 2, diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h index eb162b012eec..671a08dc5497 100644 --- a/drivers/tty/serial/sirfsoc_uart.h +++ b/drivers/tty/serial/sirfsoc_uart.h @@ -296,6 +296,7 @@ struct sirfsoc_uart_register sirfsoc_uart = { #define SIRFUART_DMA_MODE 0x0 #define SIRFUART_RX_DMA_FLUSH 0x4 +#define SIRFUART_CLEAR_RX_ADDR_EN 0x2 /* Baud Rate Calculation */ #define SIRF_USP_MIN_SAMPLE_DIV 0x1 #define SIRF_MIN_SAMPLE_DIV 0xf @@ -325,6 +326,7 @@ struct sirfsoc_uart_register sirfsoc_uart = { #define SIRFSOC_USP_ASYNC_DIV2_MASK 0x3f #define SIRFSOC_USP_ASYNC_DIV2_OFFSET 16 #define SIRFSOC_USP_LOOP_BACK_CTRL BIT(2) +#define SIRFSOC_USP_FRADDR_CLR_EN BIT(1) /* USP-UART Common */ #define SIRFSOC_UART_RX_TIMEOUT(br, to) (((br) * (((to) + 999) / 1000)) / 1000) #define SIRFUART_RECV_TIMEOUT_VALUE(x) \ @@ -431,6 +433,8 @@ struct sirfsoc_uart_port { struct hrtimer hrt; bool is_hrt_enabled; unsigned long rx_period_time; + unsigned long rx_last_pos; + unsigned long pio_fetch_cnt; }; /* Register Access Control */ -- cgit v1.2.3