diff options
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r-- | drivers/tty/serial/8250/8250_aspeed_vuart.c | 2 | ||||
-rw-r--r-- | drivers/tty/serial/8250/8250_dma.c | 11 | ||||
-rw-r--r-- | drivers/tty/serial/8250/8250_gsc.c | 2 | ||||
-rw-r--r-- | drivers/tty/serial/8250/8250_lpss.c | 28 | ||||
-rw-r--r-- | drivers/tty/serial/8250/8250_mid.c | 19 | ||||
-rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 24 | ||||
-rw-r--r-- | drivers/tty/serial/kgdboc.c | 6 | ||||
-rw-r--r-- | drivers/tty/serial/samsung_tty.c | 5 | ||||
-rw-r--r-- | drivers/tty/serial/sc16is7xx.c | 3 | ||||
-rw-r--r-- | drivers/tty/serial/serial_core.c | 14 | ||||
-rw-r--r-- | drivers/tty/serial/stm32-usart.c | 12 |
11 files changed, 103 insertions, 23 deletions
diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c index 2350fb3bb5e4..c2cecc6f47db 100644 --- a/drivers/tty/serial/8250/8250_aspeed_vuart.c +++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c @@ -487,7 +487,7 @@ static int aspeed_vuart_probe(struct platform_device *pdev) port.port.irq = irq_of_parse_and_map(np, 0); port.port.handle_irq = aspeed_vuart_handle_irq; port.port.iotype = UPIO_MEM; - port.port.type = PORT_16550A; + port.port.type = PORT_ASPEED_VUART; port.port.uartclk = clk; port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST; diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c index 890fa7ddaa7f..b3c3f7e5851a 100644 --- a/drivers/tty/serial/8250/8250_dma.c +++ b/drivers/tty/serial/8250/8250_dma.c @@ -64,10 +64,19 @@ int serial8250_tx_dma(struct uart_8250_port *p) struct uart_8250_dma *dma = p->dma; struct circ_buf *xmit = &p->port.state->xmit; struct dma_async_tx_descriptor *desc; + struct uart_port *up = &p->port; int ret; - if (dma->tx_running) + if (dma->tx_running) { + if (up->x_char) { + dmaengine_pause(dma->txchan); + uart_xchar_out(up, UART_TX); + dmaengine_resume(dma->txchan); + } return 0; + } else if (up->x_char) { + uart_xchar_out(up, UART_TX); + } if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) { /* We have been called from __dma_tx_complete() */ diff --git a/drivers/tty/serial/8250/8250_gsc.c b/drivers/tty/serial/8250/8250_gsc.c index 673cda3d011d..948d0a1c6ae8 100644 --- a/drivers/tty/serial/8250/8250_gsc.c +++ b/drivers/tty/serial/8250/8250_gsc.c @@ -26,7 +26,7 @@ static int __init serial_init_chip(struct parisc_device *dev) unsigned long address; int err; -#ifdef CONFIG_64BIT +#if defined(CONFIG_64BIT) && defined(CONFIG_IOSAPIC) if (!dev->irq && (dev->id.sversion == 0xad)) dev->irq = iosapic_serial_irq(dev); #endif diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c index 848d81e3838c..49ae73f4d3a0 100644 --- a/drivers/tty/serial/8250/8250_lpss.c +++ b/drivers/tty/serial/8250/8250_lpss.c @@ -121,8 +121,7 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port) { struct dw_dma_slave *param = &lpss->dma_param; struct pci_dev *pdev = to_pci_dev(port->dev); - unsigned int dma_devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0); - struct pci_dev *dma_dev = pci_get_slot(pdev->bus, dma_devfn); + struct pci_dev *dma_dev; switch (pdev->device) { case PCI_DEVICE_ID_INTEL_BYT_UART1: @@ -141,6 +140,8 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port) return -EINVAL; } + dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 0)); + param->dma_dev = &dma_dev->dev; param->m_master = 0; param->p_master = 1; @@ -156,6 +157,14 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port) return 0; } +static void byt_serial_exit(struct lpss8250 *lpss) +{ + struct dw_dma_slave *param = &lpss->dma_param; + + /* Paired with pci_get_slot() in the byt_serial_setup() above */ + put_device(param->dma_dev); +} + static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port) { struct uart_8250_dma *dma = &lpss->data.dma; @@ -171,6 +180,13 @@ static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port) return 0; } +static void ehl_serial_exit(struct lpss8250 *lpss) +{ + struct uart_8250_port *up = serial8250_get_port(lpss->data.line); + + up->dma = NULL; +} + #ifdef CONFIG_SERIAL_8250_DMA static const struct dw_dma_platform_data qrk_serial_dma_pdata = { .nr_channels = 2, @@ -345,8 +361,7 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id) return 0; err_exit: - if (lpss->board->exit) - lpss->board->exit(lpss); + lpss->board->exit(lpss); pci_free_irq_vectors(pdev); return ret; } @@ -357,8 +372,7 @@ static void lpss8250_remove(struct pci_dev *pdev) serial8250_unregister_port(lpss->data.line); - if (lpss->board->exit) - lpss->board->exit(lpss); + lpss->board->exit(lpss); pci_free_irq_vectors(pdev); } @@ -366,12 +380,14 @@ static const struct lpss8250_board byt_board = { .freq = 100000000, .base_baud = 2764800, .setup = byt_serial_setup, + .exit = byt_serial_exit, }; static const struct lpss8250_board ehl_board = { .freq = 200000000, .base_baud = 12500000, .setup = ehl_serial_setup, + .exit = ehl_serial_exit, }; static const struct lpss8250_board qrk_board = { diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index efa0515139f8..e6c1791609dd 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -73,6 +73,11 @@ static int pnw_setup(struct mid8250 *mid, struct uart_port *p) return 0; } +static void pnw_exit(struct mid8250 *mid) +{ + pci_dev_put(mid->dma_dev); +} + static int tng_handle_irq(struct uart_port *p) { struct mid8250 *mid = p->private_data; @@ -124,6 +129,11 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p) return 0; } +static void tng_exit(struct mid8250 *mid) +{ + pci_dev_put(mid->dma_dev); +} + static int dnv_handle_irq(struct uart_port *p) { struct mid8250 *mid = p->private_data; @@ -330,9 +340,9 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id) pci_set_drvdata(pdev, mid); return 0; + err: - if (mid->board->exit) - mid->board->exit(mid); + mid->board->exit(mid); return ret; } @@ -342,8 +352,7 @@ static void mid8250_remove(struct pci_dev *pdev) serial8250_unregister_port(mid->line); - if (mid->board->exit) - mid->board->exit(mid); + mid->board->exit(mid); } static const struct mid8250_board pnw_board = { @@ -351,6 +360,7 @@ static const struct mid8250_board pnw_board = { .freq = 50000000, .base_baud = 115200, .setup = pnw_setup, + .exit = pnw_exit, }; static const struct mid8250_board tng_board = { @@ -358,6 +368,7 @@ static const struct mid8250_board tng_board = { .freq = 38400000, .base_baud = 1843200, .setup = tng_setup, + .exit = tng_exit, }; static const struct mid8250_board dnv_board = { diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index ec88b706e882..723ec0806799 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -307,6 +307,14 @@ static const struct serial8250_config uart_config[] = { .rxtrig_bytes = {1, 32, 64, 112}, .flags = UART_CAP_FIFO | UART_CAP_SLEEP, }, + [PORT_ASPEED_VUART] = { + .name = "ASPEED VUART", + .fifo_size = 16, + .tx_loadsz = 16, + .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00, + .rxtrig_bytes = {1, 4, 8, 14}, + .flags = UART_CAP_FIFO, + }, }; /* Uart divisor latch read */ @@ -1615,6 +1623,18 @@ static inline void start_tx_rs485(struct uart_port *port) struct uart_8250_port *up = up_to_u8250p(port); struct uart_8250_em485 *em485 = up->em485; + /* + * While serial8250_em485_handle_stop_tx() is a noop if + * em485->active_timer != &em485->stop_tx_timer, it might happen that + * the timer is still armed and triggers only after the current bunch of + * chars is send and em485->active_timer == &em485->stop_tx_timer again. + * So cancel the timer. There is still a theoretical race condition if + * the timer is already running and only comes around to check for + * em485->active_timer when &em485->stop_tx_timer is armed again. + */ + if (em485->active_timer == &em485->stop_tx_timer) + hrtimer_try_to_cancel(&em485->stop_tx_timer); + em485->active_timer = NULL; if (em485->tx_stopped) { @@ -1799,9 +1819,7 @@ void serial8250_tx_chars(struct uart_8250_port *up) int count; if (port->x_char) { - serial_out(up, UART_TX, port->x_char); - port->icount.tx++; - port->x_char = 0; + uart_xchar_out(port, UART_TX); return; } if (uart_tx_stopped(port)) { diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c index 49d0c7f2b29b..79b7db8580e0 100644 --- a/drivers/tty/serial/kgdboc.c +++ b/drivers/tty/serial/kgdboc.c @@ -403,16 +403,16 @@ static int kgdboc_option_setup(char *opt) { if (!opt) { pr_err("config string not provided\n"); - return -EINVAL; + return 1; } if (strlen(opt) >= MAX_CONFIG_LEN) { pr_err("config string too long\n"); - return -ENOSPC; + return 1; } strcpy(config, opt); - return 0; + return 1; } __setup("kgdboc=", kgdboc_option_setup); diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c index e2f49863e9c2..319533b3c32a 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c @@ -922,11 +922,8 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport) return; } - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) { - spin_unlock(&port->lock); + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); - spin_lock(&port->lock); - } if (uart_circ_empty(xmit)) s3c24xx_serial_stop_tx(port); diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index acbb615dd28f..0ab788058fa2 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -734,12 +734,15 @@ static irqreturn_t sc16is7xx_irq(int irq, void *dev_id) static void sc16is7xx_tx_proc(struct kthread_work *ws) { struct uart_port *port = &(to_sc16is7xx_one(ws, tx_work)->port); + struct sc16is7xx_port *s = dev_get_drvdata(port->dev); if ((port->rs485.flags & SER_RS485_ENABLED) && (port->rs485.delay_rts_before_send > 0)) msleep(port->rs485.delay_rts_before_send); + mutex_lock(&s->efr_lock); sc16is7xx_handle_tx(port); + mutex_unlock(&s->efr_lock); } static void sc16is7xx_reconf_rs485(struct uart_port *port) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index dc6129ddef85..eb15423f935a 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -653,6 +653,20 @@ static void uart_flush_buffer(struct tty_struct *tty) } /* + * This function performs low-level write of high-priority XON/XOFF + * character and accounting for it. + * + * Requires uart_port to implement .serial_out(). + */ +void uart_xchar_out(struct uart_port *uport, int offset) +{ + serial_port_out(uport, offset, uport->x_char); + uport->icount.tx++; + uport->x_char = 0; +} +EXPORT_SYMBOL_GPL(uart_xchar_out); + +/* * This function is used to send a high-priority XON/XOFF character to * the device */ diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 200cd293d14d..810a1b0b6520 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -421,10 +421,22 @@ static void stm32_usart_transmit_chars(struct uart_port *port) struct stm32_port *stm32_port = to_stm32_port(port); const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; struct circ_buf *xmit = &port->state->xmit; + u32 isr; + int ret; if (port->x_char) { if (stm32_port->tx_dma_busy) stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT); + + /* Check that TDR is empty before filling FIFO */ + ret = + readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr, + isr, + (isr & USART_SR_TXE), + 10, 1000); + if (ret) + dev_warn(port->dev, "1 character may be erased\n"); + writel_relaxed(port->x_char, port->membase + ofs->tdr); port->x_char = 0; port->icount.tx++; |