diff options
Diffstat (limited to 'drivers/tty/serial')
26 files changed, 275 insertions, 152 deletions
diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c index e10f1244409b..2fa92ec1d1cc 100644 --- a/drivers/tty/serial/8250/8250_bcm2835aux.c +++ b/drivers/tty/serial/8250/8250_bcm2835aux.c @@ -119,7 +119,7 @@ static int bcm2835aux_serial_remove(struct platform_device *pdev) { struct bcm2835aux_data *data = platform_get_drvdata(pdev); - serial8250_unregister_port(data->uart.port.line); + serial8250_unregister_port(data->line); clk_disable_unprepare(data->clk); return 0; diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e8819aa20415..c4e9eba36023 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -181,7 +181,7 @@ static int serial_link_irq_chain(struct uart_8250_port *up) struct hlist_head *h; struct hlist_node *n; struct irq_info *i; - int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0; + int ret; mutex_lock(&hash_mutex); @@ -216,9 +216,8 @@ static int serial_link_irq_chain(struct uart_8250_port *up) INIT_LIST_HEAD(&up->list); i->head = &up->list; spin_unlock_irq(&i->lock); - irq_flags |= up->port.irqflags; ret = request_irq(up->port.irq, serial8250_interrupt, - irq_flags, "serial", i); + up->port.irqflags, "serial", i); if (ret < 0) serial_do_unlink(i, up); } diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 3177264a1166..22d65a33059e 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -269,7 +269,7 @@ static bool dw8250_fallback_dma_filter(struct dma_chan *chan, void *param) static bool dw8250_idma_filter(struct dma_chan *chan, void *param) { - return param == chan->device->dev->parent; + return param == chan->device->dev; } static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) @@ -311,7 +311,7 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) p->set_termios = dw8250_set_termios; } - /* Platforms with iDMA */ + /* Platforms with iDMA 64-bit */ if (platform_get_resource_byname(to_platform_device(p->dev), IORESOURCE_MEM, "lpss_priv")) { p->set_termios = dw8250_set_termios; diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 5b54439a8a9b..c7a7574172fa 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -1814,13 +1814,13 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir) status = serial_port_in(port, UART_LSR); - if (status & (UART_LSR_DR | UART_LSR_BI) && - iir & UART_IIR_RDI) { + if (status & (UART_LSR_DR | UART_LSR_BI)) { if (!up->dma || handle_rx_dma(up, iir)) status = serial8250_rx_chars(up, status); } serial8250_modem_status(up); - if ((!up->dma || up->dma->tx_err) && (status & UART_LSR_THRE)) + if ((!up->dma || up->dma->tx_err) && (status & UART_LSR_THRE) && + (up->ier & UART_IER_THRI)) serial8250_tx_chars(up); spin_unlock_irqrestore(&port->lock, flags); @@ -2199,6 +2199,10 @@ int serial8250_do_startup(struct uart_port *port) } } + /* Check if we need to have shared IRQs */ + if (port->irq && (up->port.flags & UPF_SHARE_IRQ)) + up->port.irqflags |= IRQF_SHARED; + if (port->irq) { unsigned char iir1; /* diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 2d8089fc2139..f6586a8681b9 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -811,10 +811,8 @@ __acquires(&uap->port.lock) if (!uap->using_tx_dma) return; - /* Avoid deadlock with the DMA engine callback */ - spin_unlock(&uap->port.lock); - dmaengine_terminate_all(uap->dmatx.chan); - spin_lock(&uap->port.lock); + dmaengine_terminate_async(uap->dmatx.chan); + if (uap->dmatx.queued) { dma_unmap_sg(uap->dmatx.chan->device->dev, &uap->dmatx.sg, 1, DMA_TO_DEVICE); diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c index 73137f4aac20..246f4aab7407 100644 --- a/drivers/tty/serial/ar933x_uart.c +++ b/drivers/tty/serial/ar933x_uart.c @@ -52,11 +52,6 @@ struct ar933x_uart_port { struct clk *clk; }; -static inline bool ar933x_uart_console_enabled(void) -{ - return IS_ENABLED(CONFIG_SERIAL_AR933X_CONSOLE); -} - static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up, int offset) { @@ -294,6 +289,10 @@ static void ar933x_uart_set_termios(struct uart_port *port, ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, AR933X_UART_CS_HOST_INT_EN); + /* enable RX and TX ready overide */ + ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, + AR933X_UART_CS_TX_READY_ORIDE | AR933X_UART_CS_RX_READY_ORIDE); + /* reenable the UART */ ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S, @@ -426,6 +425,10 @@ static int ar933x_uart_startup(struct uart_port *port) ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, AR933X_UART_CS_HOST_INT_EN); + /* enable RX and TX ready overide */ + ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, + AR933X_UART_CS_TX_READY_ORIDE | AR933X_UART_CS_RX_READY_ORIDE); + /* Enable RX interrupts */ up->ier = AR933X_UART_INT_RX_VALID; ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); @@ -511,6 +514,7 @@ static struct uart_ops ar933x_uart_ops = { .verify_port = ar933x_uart_verify_port, }; +#ifdef CONFIG_SERIAL_AR933X_CONSOLE static struct ar933x_uart_port * ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS]; @@ -607,14 +611,7 @@ static struct console ar933x_uart_console = { .index = -1, .data = &ar933x_uart_driver, }; - -static void ar933x_uart_add_console_port(struct ar933x_uart_port *up) -{ - if (!ar933x_uart_console_enabled()) - return; - - ar933x_console_ports[up->port.line] = up; -} +#endif /* CONFIG_SERIAL_AR933X_CONSOLE */ static struct uart_driver ar933x_uart_driver = { .owner = THIS_MODULE, @@ -703,7 +700,9 @@ static int ar933x_uart_probe(struct platform_device *pdev) baud = ar933x_uart_get_baud(port->uartclk, 0, AR933X_UART_MAX_STEP); up->max_baud = min_t(unsigned int, baud, AR933X_UART_MAX_BAUD); - ar933x_uart_add_console_port(up); +#ifdef CONFIG_SERIAL_AR933X_CONSOLE + ar933x_console_ports[up->port.line] = up; +#endif ret = uart_add_one_port(&ar933x_uart_driver, &up->port); if (ret) @@ -752,8 +751,9 @@ static int __init ar933x_uart_init(void) { int ret; - if (ar933x_uart_console_enabled()) - ar933x_uart_driver.cons = &ar933x_uart_console; +#ifdef CONFIG_SERIAL_AR933X_CONSOLE + ar933x_uart_driver.cons = &ar933x_uart_console; +#endif ret = uart_register_driver(&ar933x_uart_driver); if (ret) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 5a341b1c65c3..4a7eb85f7c85 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -175,6 +175,8 @@ struct atmel_uart_port { unsigned int pending_status; spinlock_t lock_suspended; + bool hd_start_rx; /* can start RX during half-duplex operation */ + int (*prepare_rx)(struct uart_port *port); int (*prepare_tx)(struct uart_port *port); void (*schedule_rx)(struct uart_port *port); @@ -241,6 +243,12 @@ static inline void atmel_uart_write_char(struct uart_port *port, u8 value) #endif +static inline int atmel_uart_is_half_duplex(struct uart_port *port) +{ + return (port->rs485.flags & SER_RS485_ENABLED) && + !(port->rs485.flags & SER_RS485_RX_DURING_TX); +} + #ifdef CONFIG_SERIAL_ATMEL_PDC static bool atmel_use_pdc_rx(struct uart_port *port) { @@ -492,9 +500,10 @@ static void atmel_stop_tx(struct uart_port *port) /* Disable interrupts */ atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); - if ((port->rs485.flags & SER_RS485_ENABLED) && - !(port->rs485.flags & SER_RS485_RX_DURING_TX)) - atmel_start_rx(port); + if (atmel_uart_is_half_duplex(port)) + if (!atomic_read(&atmel_port->tasklet_shutdown)) + atmel_start_rx(port); + } /* @@ -511,8 +520,7 @@ static void atmel_start_tx(struct uart_port *port) return; if (atmel_use_pdc_tx(port) || atmel_use_dma_tx(port)) - if ((port->rs485.flags & SER_RS485_ENABLED) && - !(port->rs485.flags & SER_RS485_RX_DURING_TX)) + if (atmel_uart_is_half_duplex(port)) atmel_stop_rx(port); if (atmel_use_pdc_tx(port)) @@ -809,10 +817,14 @@ static void atmel_complete_tx_dma(void *arg) */ if (!uart_circ_empty(xmit)) atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); - else if ((port->rs485.flags & SER_RS485_ENABLED) && - !(port->rs485.flags & SER_RS485_RX_DURING_TX)) { - /* DMA done, stop TX, start RX for RS485 */ - atmel_start_rx(port); + else if (atmel_uart_is_half_duplex(port)) { + /* + * DMA done, re-enable TXEMPTY and signal that we can stop + * TX and start RX for RS485 + */ + atmel_port->hd_start_rx = true; + atmel_uart_writel(port, ATMEL_US_IER, + atmel_port->tx_done_mask); } spin_unlock_irqrestore(&port->lock, flags); @@ -1166,6 +1178,10 @@ static int atmel_prepare_rx_dma(struct uart_port *port) sg_dma_len(&atmel_port->sg_rx)/2, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); + if (!desc) { + dev_err(port->dev, "Preparing DMA cyclic failed\n"); + goto chan_err; + } desc->callback = atmel_complete_rx_dma; desc->callback_param = port; atmel_port->desc_rx = desc; @@ -1253,9 +1269,19 @@ atmel_handle_transmit(struct uart_port *port, unsigned int pending) struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); if (pending & atmel_port->tx_done_mask) { - /* Either PDC or interrupt transmission */ atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask); + + /* Start RX if flag was set and FIFO is empty */ + if (atmel_port->hd_start_rx) { + if (!(atmel_uart_readl(port, ATMEL_US_CSR) + & ATMEL_US_TXEMPTY)) + dev_warn(port->dev, "Should start RX, but TX fifo is not empty\n"); + + atmel_port->hd_start_rx = false; + atmel_start_rx(port); + } + atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx); } } @@ -1382,8 +1408,7 @@ static void atmel_tx_pdc(struct uart_port *port) atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask); } else { - if ((port->rs485.flags & SER_RS485_ENABLED) && - !(port->rs485.flags & SER_RS485_RX_DURING_TX)) { + if (atmel_uart_is_half_duplex(port)) { /* DMA done, stop TX, start RX for RS485 */ atmel_start_rx(port); } @@ -2176,27 +2201,6 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, mode |= ATMEL_US_USMODE_NORMAL; } - /* set the mode, clock divisor, parity, stop bits and data size */ - atmel_uart_writel(port, ATMEL_US_MR, mode); - - /* - * when switching the mode, set the RTS line state according to the - * new mode, otherwise keep the former state - */ - if ((old_mode & ATMEL_US_USMODE) != (mode & ATMEL_US_USMODE)) { - unsigned int rts_state; - - if ((mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_HWHS) { - /* let the hardware control the RTS line */ - rts_state = ATMEL_US_RTSDIS; - } else { - /* force RTS line to low level */ - rts_state = ATMEL_US_RTSEN; - } - - atmel_uart_writel(port, ATMEL_US_CR, rts_state); - } - /* * Set the baud rate: * Fractional baudrate allows to setup output frequency more @@ -2223,6 +2227,28 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, quot = cd | fp << ATMEL_US_FP_OFFSET; atmel_uart_writel(port, ATMEL_US_BRGR, quot); + + /* set the mode, clock divisor, parity, stop bits and data size */ + atmel_uart_writel(port, ATMEL_US_MR, mode); + + /* + * when switching the mode, set the RTS line state according to the + * new mode, otherwise keep the former state + */ + if ((old_mode & ATMEL_US_USMODE) != (mode & ATMEL_US_USMODE)) { + unsigned int rts_state; + + if ((mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_HWHS) { + /* let the hardware control the RTS line */ + rts_state = ATMEL_US_RTSDIS; + } else { + /* force RTS line to low level */ + rts_state = ATMEL_US_RTSEN; + } + + atmel_uart_writel(port, ATMEL_US_CR, rts_state); + } + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN); diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c index 0040c29f651a..b9e137c03fe3 100644 --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c @@ -421,7 +421,16 @@ static int cpm_uart_startup(struct uart_port *port) clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX); } cpm_uart_initbd(pinfo); - cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); + if (IS_SMC(pinfo)) { + out_be32(&pinfo->smcup->smc_rstate, 0); + out_be32(&pinfo->smcup->smc_tstate, 0); + out_be16(&pinfo->smcup->smc_rbptr, + in_be16(&pinfo->smcup->smc_rbase)); + out_be16(&pinfo->smcup->smc_tbptr, + in_be16(&pinfo->smcup->smc_tbase)); + } else { + cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); + } } /* Install interrupt handler. */ retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port); @@ -875,16 +884,14 @@ static void cpm_uart_init_smc(struct uart_cpm_port *pinfo) (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE); /* - * In case SMC1 is being relocated... + * In case SMC is being relocated... */ -#if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH) out_be16(&up->smc_rbptr, in_be16(&pinfo->smcup->smc_rbase)); out_be16(&up->smc_tbptr, in_be16(&pinfo->smcup->smc_tbase)); out_be32(&up->smc_rstate, 0); out_be32(&up->smc_tstate, 0); out_be16(&up->smc_brkcr, 1); /* number of break chars */ out_be16(&up->smc_brkec, 0); -#endif /* Set up the uart parameters in the * parameter ram. @@ -898,8 +905,6 @@ static void cpm_uart_init_smc(struct uart_cpm_port *pinfo) out_be16(&up->smc_brkec, 0); out_be16(&up->smc_brkcr, 1); - cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); - /* Set UART mode, 8 bit, no parity, one stop. * Enable receive and transmit. */ diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c index 02ad6953b167..50ec5f1ac77f 100644 --- a/drivers/tty/serial/digicolor-usart.c +++ b/drivers/tty/serial/digicolor-usart.c @@ -545,7 +545,11 @@ static int __init digicolor_uart_init(void) if (ret) return ret; - return platform_driver_register(&digicolor_uart_platform); + ret = platform_driver_register(&digicolor_uart_platform); + if (ret) + uart_unregister_driver(&digicolor_uart); + + return ret; } module_init(digicolor_uart_init); diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c index 91d2ddd6ef88..180b77334fdd 100644 --- a/drivers/tty/serial/ifx6x60.c +++ b/drivers/tty/serial/ifx6x60.c @@ -1244,6 +1244,9 @@ static int ifx_spi_spi_remove(struct spi_device *spi) struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi); /* stop activity */ tasklet_kill(&ifx_dev->io_work_tasklet); + + pm_runtime_disable(&spi->dev); + /* free irq */ free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), ifx_dev); free_irq(gpio_to_irq(ifx_dev->gpio.srdy), ifx_dev); diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index ee90d117df57..bcfa0d634631 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -573,7 +573,7 @@ static void dma_tx_work(struct work_struct *w) dev_err(dev, "DMA mapping error for TX.\n"); goto err_out; } - desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, + desc = dmaengine_prep_slave_sg(chan, sgl, ret, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); if (!desc) { dev_err(dev, "We cannot prepare for the TX slave dma!\n"); @@ -1981,7 +1981,7 @@ imx_console_setup(struct console *co, char *options) retval = clk_prepare(sport->clk_per); if (retval) - clk_disable_unprepare(sport->clk_ipg); + clk_unprepare(sport->clk_ipg); error_console: return retval; diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c index f2b0d8cee8ef..0314e78e31ff 100644 --- a/drivers/tty/serial/kgdboc.c +++ b/drivers/tty/serial/kgdboc.c @@ -148,8 +148,10 @@ static int configure_kgdboc(void) char *cptr = config; struct console *cons; - if (!strlen(config) || isspace(config[0])) + if (!strlen(config) || isspace(config[0])) { + err = 0; goto noconfig; + } kgdboc_io_ops.is_console = 0; kgdb_tty_driver = NULL; diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 8a3e92638e10..80ab672d61cc 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -494,37 +494,48 @@ static bool max310x_reg_precious(struct device *dev, unsigned int reg) static int max310x_set_baud(struct uart_port *port, int baud) { - unsigned int mode = 0, clk = port->uartclk, div = clk / baud; + unsigned int mode = 0, div = 0, frac = 0, c = 0, F = 0; - /* Check for minimal value for divider */ - if (div < 16) - div = 16; - - if (clk % baud && (div / 16) < 0x8000) { + /* + * Calculate the integer divisor first. Select a proper mode + * in case if the requested baud is too high for the pre-defined + * clocks frequency. + */ + div = port->uartclk / baud; + if (div < 8) { + /* Mode x4 */ + c = 4; + mode = MAX310X_BRGCFG_4XMODE_BIT; + } else if (div < 16) { /* Mode x2 */ + c = 8; mode = MAX310X_BRGCFG_2XMODE_BIT; - clk = port->uartclk * 2; - div = clk / baud; - - if (clk % baud && (div / 16) < 0x8000) { - /* Mode x4 */ - mode = MAX310X_BRGCFG_4XMODE_BIT; - clk = port->uartclk * 4; - div = clk / baud; - } + } else { + c = 16; } - max310x_port_write(port, MAX310X_BRGDIVMSB_REG, (div / 16) >> 8); - max310x_port_write(port, MAX310X_BRGDIVLSB_REG, div / 16); - max310x_port_write(port, MAX310X_BRGCFG_REG, (div % 16) | mode); + /* Calculate the divisor in accordance with the fraction coefficient */ + div /= c; + F = c*baud; - return DIV_ROUND_CLOSEST(clk, div); + /* Calculate the baud rate fraction */ + if (div > 0) + frac = (16*(port->uartclk % F)) / F; + else + div = 1; + + max310x_port_write(port, MAX310X_BRGDIVMSB_REG, div >> 8); + max310x_port_write(port, MAX310X_BRGDIVLSB_REG, div); + max310x_port_write(port, MAX310X_BRGCFG_REG, frac | mode); + + /* Return the actual baud rate we just programmed */ + return (16*port->uartclk) / (c*(16*div + frac)); } static int max310x_update_best_err(unsigned long f, long *besterr) { /* Use baudrate 115200 for calculate error */ - long err = f % (115200 * 16); + long err = f % (460800 * 16); if ((*besterr < 0) || (*besterr > err)) { *besterr = err; @@ -579,7 +590,7 @@ static int max310x_set_ref_clk(struct max310x_port *s, unsigned long freq, } /* Configure clock source */ - clksrc = xtal ? MAX310X_CLKSRC_CRYST_BIT : MAX310X_CLKSRC_EXTCLK_BIT; + clksrc = MAX310X_CLKSRC_EXTCLK_BIT | (xtal ? MAX310X_CLKSRC_CRYST_BIT : 0); /* Configure PLL */ if (pllcfg) { @@ -758,12 +769,9 @@ static void max310x_start_tx(struct uart_port *port) static unsigned int max310x_tx_empty(struct uart_port *port) { - unsigned int lvl, sts; - - lvl = max310x_port_read(port, MAX310X_TXFIFOLVL_REG); - sts = max310x_port_read(port, MAX310X_IRQSTS_REG); + u8 lvl = max310x_port_read(port, MAX310X_TXFIFOLVL_REG); - return ((sts & MAX310X_IRQ_TXEMPTY_BIT) && !lvl) ? TIOCSER_TEMT : 0; + return lvl ? 0 : TIOCSER_TEMT; } static unsigned int max310x_get_mctrl(struct uart_port *port) @@ -1323,6 +1331,8 @@ static int max310x_spi_probe(struct spi_device *spi) if (spi->dev.of_node) { const struct of_device_id *of_id = of_match_device(max310x_dt_ids, &spi->dev); + if (!of_id) + return -ENODEV; devtype = (struct max310x_devtype *)of_id->data; } else { diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c index 6788e7532dff..9e6d44df3fab 100644 --- a/drivers/tty/serial/msm_serial.c +++ b/drivers/tty/serial/msm_serial.c @@ -391,10 +391,14 @@ no_rx: static inline void msm_wait_for_xmitr(struct uart_port *port) { + unsigned int timeout = 500000; + while (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY)) { if (msm_read(port, UART_ISR) & UART_ISR_TX_READY) break; udelay(1); + if (!timeout--) + break; } msm_write(port, UART_CR_CMD_RESET_TX_READY, UART_CR); } @@ -868,6 +872,7 @@ static void msm_handle_tx(struct uart_port *port) struct circ_buf *xmit = &msm_port->uart.state->xmit; struct msm_dma *dma = &msm_port->tx_dma; unsigned int pio_count, dma_count, dma_min; + char buf[4] = { 0 }; void __iomem *tf; int err = 0; @@ -877,10 +882,12 @@ static void msm_handle_tx(struct uart_port *port) else tf = port->membase + UART_TF; + buf[0] = port->x_char; + if (msm_port->is_uartdm) msm_reset_dm_count(port, 1); - iowrite8_rep(tf, &port->x_char, 1); + iowrite32_rep(tf, buf, 1); port->icount.tx++; port->x_char = 0; return; @@ -981,6 +988,7 @@ static unsigned int msm_get_mctrl(struct uart_port *port) static void msm_reset(struct uart_port *port) { struct msm_port *msm_port = UART_TO_MSM(port); + unsigned int mr; /* reset everything */ msm_write(port, UART_CR_CMD_RESET_RX, UART_CR); @@ -988,7 +996,10 @@ static void msm_reset(struct uart_port *port) msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR); msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR); msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR); - msm_write(port, UART_CR_CMD_SET_RFR, UART_CR); + msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR); + mr = msm_read(port, UART_MR1); + mr &= ~UART_MR1_RX_RDY_CTL; + msm_write(port, mr, UART_MR1); /* Disable DM modes */ if (msm_port->is_uartdm) @@ -1568,6 +1579,7 @@ static void __msm_console_write(struct uart_port *port, const char *s, int num_newlines = 0; bool replaced = false; void __iomem *tf; + int locked = 1; if (is_uartdm) tf = port->membase + UARTDM_TF; @@ -1580,7 +1592,13 @@ static void __msm_console_write(struct uart_port *port, const char *s, num_newlines++; count += num_newlines; - spin_lock(&port->lock); + if (port->sysrq) + locked = 0; + else if (oops_in_progress) + locked = spin_trylock(&port->lock); + else + spin_lock(&port->lock); + if (is_uartdm) msm_reset_dm_count(port, count); @@ -1616,7 +1634,9 @@ static void __msm_console_write(struct uart_port *port, const char *s, iowrite32_rep(tf, buf, 1); i += num_chars; } - spin_unlock(&port->lock); + + if (locked) + spin_unlock(&port->lock); } static void msm_console_write(struct console *co, const char *s, diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 401c983ec5f3..a10e4aa9e18e 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -581,7 +581,7 @@ static int mvebu_uart_probe(struct platform_device *pdev) port->membase = devm_ioremap_resource(&pdev->dev, reg); if (IS_ERR(port->membase)) - return -PTR_ERR(port->membase); + return PTR_ERR(port->membase); data = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_uart_data), GFP_KERNEL); diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 1d9d778828ba..515bf18c8294 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1635,8 +1635,9 @@ static int mxs_auart_request_gpio_irq(struct mxs_auart_port *s) /* * If something went wrong, rollback. + * Be careful: i may be unsigned. */ - while (err && (--i >= 0)) + while (err && (i-- > 0)) if (irq[i] >= 0) free_irq(irq[i], s); diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index 42caccb5e87e..30b577384a1d 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -252,6 +252,7 @@ struct eg20t_port { struct dma_chan *chan_rx; struct scatterlist *sg_tx_p; int nent; + int orig_nent; struct scatterlist sg_rx; int tx_dma_use; void *rx_buf_virt; @@ -806,9 +807,10 @@ static void pch_dma_tx_complete(void *arg) } xmit->tail &= UART_XMIT_SIZE - 1; async_tx_ack(priv->desc_tx); - dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE); + dma_unmap_sg(port->dev, sg, priv->orig_nent, DMA_TO_DEVICE); priv->tx_dma_use = 0; priv->nent = 0; + priv->orig_nent = 0; kfree(priv->sg_tx_p); pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT); } @@ -1033,6 +1035,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv) dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__); return 0; } + priv->orig_nent = num; priv->nent = nent; for (i = 0; i < nent; i++, sg++) { diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index ea6b62cece88..f80a88d107d7 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -332,6 +332,7 @@ struct sc16is7xx_port { struct kthread_worker kworker; struct task_struct *kworker_task; struct kthread_work irq_work; + struct mutex efr_lock; struct sc16is7xx_one p[0]; }; @@ -503,6 +504,21 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) div /= 4; } + /* In an amazing feat of design, the Enhanced Features Register shares + * the address of the Interrupt Identification Register, and is + * switched in by writing a magic value (0xbf) to the Line Control + * Register. Any interrupt firing during this time will see the EFR + * where it expects the IIR to be, leading to "Unexpected interrupt" + * messages. + * + * Prevent this possibility by claiming a mutex while accessing the + * EFR, and claiming the same mutex from within the interrupt handler. + * This is similar to disabling the interrupt, but that doesn't work + * because the bulk of the interrupt processing is run as a workqueue + * job in thread context. + */ + mutex_lock(&s->efr_lock); + lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG); /* Open the LCR divisors for configuration */ @@ -518,6 +534,8 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud) /* Put LCR back to the normal mode */ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr); + mutex_unlock(&s->efr_lock); + sc16is7xx_port_update(port, SC16IS7XX_MCR_REG, SC16IS7XX_MCR_CLKSEL_BIT, prescaler); @@ -700,6 +718,8 @@ static void sc16is7xx_ist(struct kthread_work *ws) { struct sc16is7xx_port *s = to_sc16is7xx_port(ws, irq_work); + mutex_lock(&s->efr_lock); + while (1) { bool keep_polling = false; int i; @@ -709,6 +729,8 @@ static void sc16is7xx_ist(struct kthread_work *ws) if (!keep_polling) break; } + + mutex_unlock(&s->efr_lock); } static irqreturn_t sc16is7xx_irq(int irq, void *dev_id) @@ -903,6 +925,9 @@ static void sc16is7xx_set_termios(struct uart_port *port, if (!(termios->c_cflag & CREAD)) port->ignore_status_mask |= SC16IS7XX_LSR_BRK_ERROR_MASK; + /* As above, claim the mutex while accessing the EFR. */ + mutex_lock(&s->efr_lock); + sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, SC16IS7XX_LCR_CONF_MODE_B); @@ -924,6 +949,8 @@ static void sc16is7xx_set_termios(struct uart_port *port, /* Update LCR register */ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr); + mutex_unlock(&s->efr_lock); + /* Get baud rate generator configuration */ baud = uart_get_baud_rate(port, termios, old, port->uartclk / 16 / 4 / 0xffff, @@ -1186,6 +1213,7 @@ static int sc16is7xx_probe(struct device *dev, s->regmap = regmap; s->devtype = devtype; dev_set_drvdata(dev, s); + mutex_init(&s->efr_lock); kthread_init_worker(&s->kworker); kthread_init_work(&s->irq_work, sc16is7xx_ist); @@ -1482,7 +1510,7 @@ static int __init sc16is7xx_init(void) ret = i2c_add_driver(&sc16is7xx_i2c_uart_driver); if (ret < 0) { pr_err("failed to init sc16is7xx i2c --> %d\n", ret); - return ret; + goto err_i2c; } #endif @@ -1490,10 +1518,18 @@ static int __init sc16is7xx_init(void) ret = spi_register_driver(&sc16is7xx_spi_uart_driver); if (ret < 0) { pr_err("failed to init sc16is7xx spi --> %d\n", ret); - return ret; + goto err_spi; } #endif return ret; + +err_spi: +#ifdef CONFIG_SERIAL_SC16IS7XX_I2C + i2c_del_driver(&sc16is7xx_i2c_uart_driver); +#endif +err_i2c: + uart_unregister_driver(&sc16is7xx_uart); + return ret; } module_init(sc16is7xx_init); diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 55ed4c66f77f..3701b240fcb3 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -141,9 +141,6 @@ static void uart_start(struct tty_struct *tty) struct uart_port *port; unsigned long flags; - if (!state) - return; - port = uart_port_lock(state, flags); __uart_start(tty); uart_port_unlock(port, flags); @@ -1109,7 +1106,7 @@ static int uart_break_ctl(struct tty_struct *tty, int break_state) if (!uport) goto out; - if (uport->type != PORT_UNKNOWN) + if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) uport->ops->break_ctl(uport, break_state); ret = 0; out: @@ -1714,11 +1711,8 @@ static void uart_dtr_rts(struct tty_port *port, int onoff) */ static int uart_open(struct tty_struct *tty, struct file *filp) { - struct uart_driver *drv = tty->driver->driver_state; - int retval, line = tty->index; - struct uart_state *state = drv->state + line; - - tty->driver_data = state; + struct uart_state *state = tty->driver_data; + int retval; retval = tty_port_open(&state->port, tty, filp); if (retval > 0) @@ -1731,6 +1725,7 @@ static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) { struct uart_state *state = container_of(port, struct uart_state, port); struct uart_port *uport; + int ret; uport = uart_port_check(state); if (!uport || uport->flags & UPF_DEAD) @@ -1741,7 +1736,11 @@ static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) /* * Start up the serial port. */ - return uart_startup(tty, state, 0); + ret = uart_startup(tty, state, 0); + if (ret > 0) + tty_port_set_active(port, 1); + + return ret; } static const char *uart_type(struct uart_port *port) @@ -2409,9 +2408,6 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) struct uart_state *state = drv->state + line; struct uart_port *port; - if (!state) - return; - port = uart_port_ref(state); if (!port) return; @@ -2423,7 +2419,18 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) } #endif +static int uart_install(struct tty_driver *driver, struct tty_struct *tty) +{ + struct uart_driver *drv = driver->driver_state; + struct uart_state *state = drv->state + tty->index; + + tty->driver_data = state; + + return tty_standard_install(driver, tty); +} + static const struct tty_operations uart_ops = { + .install = uart_install, .open = uart_open, .close = uart_close, .write = uart_write, @@ -2788,6 +2795,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) if (uport->cons && uport->dev) of_console_check(uport->dev->of_node, uport->cons->name, uport->line); + tty_port_link_device(port, drv->tty_driver, uport->line); uart_configure_port(drv, state, uport); port->console = uart_console(uport); diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index d2da6aa7f27d..1bb15edcf1e7 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -68,6 +68,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set); struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { + if (gpios == NULL) + return NULL; + return gpios->gpio[gidx]; } EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod); diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 6ff53b604ff6..ea35f5144237 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -834,19 +834,9 @@ static void sci_transmit_chars(struct uart_port *port) if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); - if (uart_circ_empty(xmit)) { + if (uart_circ_empty(xmit)) sci_stop_tx(port); - } else { - ctrl = serial_port_in(port, SCSCR); - - if (port->type != PORT_SCI) { - serial_port_in(port, SCxSR); /* Dummy read */ - sci_clear_SCxSR(port, SCxSR_TDxE_CLEAR(port)); - } - ctrl |= SCSCR_TIE; - serial_port_out(port, SCSCR, ctrl); - } } /* On SH3, SCIF may read end-of-break as a space->mark char */ @@ -1301,6 +1291,7 @@ static void work_fn_tx(struct work_struct *work) struct uart_port *port = &s->port; struct circ_buf *xmit = &port->state->xmit; dma_addr_t buf; + int head, tail; /* * DMA is idle now. @@ -1310,16 +1301,23 @@ static void work_fn_tx(struct work_struct *work) * consistent xmit buffer state. */ spin_lock_irq(&port->lock); - buf = s->tx_dma_addr + (xmit->tail & (UART_XMIT_SIZE - 1)); + head = xmit->head; + tail = xmit->tail; + buf = s->tx_dma_addr + (tail & (UART_XMIT_SIZE - 1)); s->tx_dma_len = min_t(unsigned int, - CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE), - CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE)); - spin_unlock_irq(&port->lock); + CIRC_CNT(head, tail, UART_XMIT_SIZE), + CIRC_CNT_TO_END(head, tail, UART_XMIT_SIZE)); + if (!s->tx_dma_len) { + /* Transmit buffer has been flushed */ + spin_unlock_irq(&port->lock); + return; + } desc = dmaengine_prep_slave_single(chan, buf, s->tx_dma_len, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { + spin_unlock_irq(&port->lock); dev_warn(port->dev, "Failed preparing Tx DMA descriptor\n"); /* switch to PIO */ sci_tx_dma_release(s, true); @@ -1329,20 +1327,20 @@ static void work_fn_tx(struct work_struct *work) dma_sync_single_for_device(chan->device->dev, buf, s->tx_dma_len, DMA_TO_DEVICE); - spin_lock_irq(&port->lock); desc->callback = sci_dma_tx_complete; desc->callback_param = s; - spin_unlock_irq(&port->lock); s->cookie_tx = dmaengine_submit(desc); if (dma_submit_error(s->cookie_tx)) { + spin_unlock_irq(&port->lock); dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n"); /* switch to PIO */ sci_tx_dma_release(s, true); return; } + spin_unlock_irq(&port->lock); dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", - __func__, xmit->buf, xmit->tail, xmit->head, s->cookie_tx); + __func__, xmit->buf, tail, head, s->cookie_tx); dma_async_issue_pending(chan); } @@ -1548,11 +1546,18 @@ static void sci_free_dma(struct uart_port *port) static void sci_flush_buffer(struct uart_port *port) { + struct sci_port *s = to_sci_port(port); + /* * In uart_flush_buffer(), the xmit circular buffer has just been - * cleared, so we have to reset tx_dma_len accordingly. + * cleared, so we have to reset tx_dma_len accordingly, and stop any + * pending transfers */ - to_sci_port(port)->tx_dma_len = 0; + s->tx_dma_len = 0; + if (s->chan_tx) { + dmaengine_terminate_async(s->chan_tx); + s->cookie_tx = -EINVAL; + } } #else /* !CONFIG_SERIAL_SH_SCI_DMA */ static inline void sci_request_dma(struct uart_port *port) diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index 747560feb63e..2e34239ac8a9 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -240,7 +240,7 @@ static inline void sprd_rx(struct uart_port *port) if (lsr & (SPRD_LSR_BI | SPRD_LSR_PE | SPRD_LSR_FE | SPRD_LSR_OE)) - if (handle_lsr_errors(port, &lsr, &flag)) + if (handle_lsr_errors(port, &flag, &lsr)) continue; if (uart_handle_sysrq_char(port, ch)) continue; diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 033856287ca2..ea8b591dd46f 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -293,13 +293,8 @@ static void stm32_transmit_chars(struct uart_port *port) return; } - if (uart_tx_stopped(port)) { - stm32_stop_tx(port); - return; - } - - if (uart_circ_empty(xmit)) { - stm32_stop_tx(port); + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + stm32_clr_bits(port, ofs->cr1, USART_CR1_TXEIE); return; } @@ -312,7 +307,7 @@ static void stm32_transmit_chars(struct uart_port *port) uart_write_wakeup(port); if (uart_circ_empty(xmit)) - stm32_stop_tx(port); + stm32_clr_bits(port, ofs->cr1, USART_CR1_TXEIE); } static irqreturn_t stm32_interrupt(int irq, void *ptr) diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c index 59828d819145..5ad978acd90c 100644 --- a/drivers/tty/serial/sunhv.c +++ b/drivers/tty/serial/sunhv.c @@ -392,7 +392,7 @@ static struct uart_ops sunhv_pops = { static struct uart_driver sunhv_reg = { .owner = THIS_MODULE, .driver_name = "sunhv", - .dev_name = "ttyS", + .dev_name = "ttyHV", .major = TTY_MAJOR, }; diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index 817bb0d3f326..9a54aafe8405 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -746,7 +746,8 @@ err_uart: static void __exit ulite_exit(void) { platform_driver_unregister(&ulite_platform_driver); - uart_unregister_driver(&ulite_uart_driver); + if (ulite_uart_driver.state) + uart_unregister_driver(&ulite_uart_driver); } module_init(ulite_init); diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index ffb474c49f0f..eb61a07fcbbc 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1261,7 +1261,7 @@ static void cdns_uart_console_write(struct console *co, const char *s, * * Return: 0 on success, negative errno otherwise. */ -static int __init cdns_uart_console_setup(struct console *co, char *options) +static int cdns_uart_console_setup(struct console *co, char *options) { struct uart_port *port = &cdns_uart_port[co->index]; int baud = 9600; |