diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/serial/ns16550.c | 123 |
2 files changed, 5 insertions, 128 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index a8e997834a..1c2c5d66e1 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -64,16 +64,6 @@ config DM_SERIAL implements serial_putc() etc. The uclass interface is defined in include/serial.h. -config SERIAL_IRQ_BUFFER - bool "Enable RX interrupt buffer for serial input" - depends on DM_SERIAL - default n - help - Enable RX interrupt buffer support for the serial driver. - This enables pasting longer strings, even when the RX FIFO - of the UART is not big enough (e.g. 16 bytes on the normal - NS16550). - config SPL_DM_SERIAL bool "Enable Driver Model for serial drivers in SPL" depends on DM_SERIAL diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 607a1b8c1d..c702304e79 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -314,80 +314,6 @@ DEBUG_UART_FUNCS #endif #ifdef CONFIG_DM_SERIAL - -#if CONFIG_IS_ENABLED(SERIAL_IRQ_BUFFER) - -#define BUF_COUNT 256 - -static void rx_fifo_to_buf(struct udevice *dev) -{ - struct NS16550 *const com_port = dev_get_priv(dev); - struct ns16550_platdata *plat = dev->platdata; - - /* Read all available chars into buffer */ - while ((serial_in(&com_port->lsr) & UART_LSR_DR)) { - plat->buf[plat->wr_ptr++] = serial_in(&com_port->rbr); - plat->wr_ptr %= BUF_COUNT; - } -} - -static int rx_pending(struct udevice *dev) -{ - struct ns16550_platdata *plat = dev->platdata; - - /* - * At startup it may happen, that some already received chars are - * "stuck" in the RX FIFO, even with the interrupt enabled. This - * RX FIFO flushing makes sure, that these chars are read out and - * the RX interrupts works as expected. - */ - rx_fifo_to_buf(dev); - - return plat->rd_ptr != plat->wr_ptr ? 1 : 0; -} - -static int rx_get(struct udevice *dev) -{ - struct ns16550_platdata *plat = dev->platdata; - char val; - - val = plat->buf[plat->rd_ptr++]; - plat->rd_ptr %= BUF_COUNT; - - return val; -} - -void ns16550_handle_irq(void *data) -{ - struct udevice *dev = (struct udevice *)data; - struct NS16550 *const com_port = dev_get_priv(dev); - - /* Check if interrupt is pending */ - if (serial_in(&com_port->iir) & UART_IIR_NO_INT) - return; - - /* Flush all available characters from the RX FIFO into the RX buffer */ - rx_fifo_to_buf(dev); -} - -#else /* CONFIG_SERIAL_IRQ_BUFFER */ - -static int rx_pending(struct udevice *dev) -{ - struct NS16550 *const com_port = dev_get_priv(dev); - - return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0; -} - -static int rx_get(struct udevice *dev) -{ - struct NS16550 *const com_port = dev_get_priv(dev); - - return serial_in(&com_port->rbr); -} - -#endif /* CONFIG_SERIAL_IRQ_BUFFER */ - static int ns16550_serial_putc(struct udevice *dev, const char ch) { struct NS16550 *const com_port = dev_get_priv(dev); @@ -413,17 +339,19 @@ static int ns16550_serial_pending(struct udevice *dev, bool input) struct NS16550 *const com_port = dev_get_priv(dev); if (input) - return rx_pending(dev); + return serial_in(&com_port->lsr) & UART_LSR_DR ? 1 : 0; else return serial_in(&com_port->lsr) & UART_LSR_THRE ? 0 : 1; } static int ns16550_serial_getc(struct udevice *dev) { - if (!ns16550_serial_pending(dev, true)) + struct NS16550 *const com_port = dev_get_priv(dev); + + if (!(serial_in(&com_port->lsr) & UART_LSR_DR)) return -EAGAIN; - return rx_get(dev); + return serial_in(&com_port->rbr); } static int ns16550_serial_setbrg(struct udevice *dev, int baudrate) @@ -446,39 +374,8 @@ int ns16550_serial_probe(struct udevice *dev) com_port->plat = dev_get_platdata(dev); NS16550_init(com_port, -1); -#if CONFIG_IS_ENABLED(SERIAL_IRQ_BUFFER) - if (gd->flags & GD_FLG_RELOC) { - struct ns16550_platdata *plat = dev->platdata; - - /* Allocate the RX buffer */ - plat->buf = malloc(BUF_COUNT); - - /* Install the interrupt handler */ - irq_install_handler(plat->irq, ns16550_handle_irq, dev); - - /* Enable RX interrupts */ - serial_out(UART_IER_RDI, &com_port->ier); - } -#endif - - return 0; -} - -#if CONFIG_IS_ENABLED(SERIAL_PRESENT) && \ - (!defined(CONFIG_TPL_BUILD) || defined(CONFIG_TPL_DM_SERIAL)) -static int ns16550_serial_remove(struct udevice *dev) -{ -#if CONFIG_IS_ENABLED(SERIAL_IRQ_BUFFER) - if (gd->flags & GD_FLG_RELOC) { - struct ns16550_platdata *plat = dev->platdata; - - irq_free_handler(plat->irq); - } -#endif - return 0; } -#endif #if CONFIG_IS_ENABLED(OF_CONTROL) enum { @@ -561,15 +458,6 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev) if (port_type == PORT_JZ4780) plat->fcr |= UART_FCR_UME; -#if CONFIG_IS_ENABLED(SERIAL_IRQ_BUFFER) - plat->irq = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), - "interrupts", 0); - if (!plat->irq) { - debug("ns16550 interrupt not provided\n"); - return -EINVAL; - } -#endif - return 0; } #endif @@ -617,7 +505,6 @@ U_BOOT_DRIVER(ns16550_serial) = { #endif .priv_auto_alloc_size = sizeof(struct NS16550), .probe = ns16550_serial_probe, - .remove = ns16550_serial_remove, .ops = &ns16550_serial_ops, .flags = DM_FLAG_PRE_RELOC, }; |