static int altera_uart_poll_get_char(struct uart_port *port) { while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_RRDY_MSK)) cpu_relax(); return altera_uart_readl(port, ALTERA_UART_RXDATA_REG); }
static void altera_uart_rx_chars(struct altera_uart *pp) { struct uart_port *port = &pp->port; unsigned char ch, flag; unsigned short status; while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) & ALTERA_UART_STATUS_RRDY_MSK) { ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG); flag = TTY_NORMAL; port->icount.rx++; if (status & ALTERA_UART_STATUS_E_MSK) { altera_uart_writel(port, status, ALTERA_UART_STATUS_REG); if (status & ALTERA_UART_STATUS_BRK_MSK) { port->icount.brk++; if (uart_handle_break(port)) continue; } else if (status & ALTERA_UART_STATUS_PE_MSK) { port->icount.parity++; } else if (status & ALTERA_UART_STATUS_ROE_MSK) { port->icount.overrun++; } else if (status & ALTERA_UART_STATUS_FE_MSK) { port->icount.frame++; } status &= port->read_status_mask; if (status & ALTERA_UART_STATUS_BRK_MSK) flag = TTY_BREAK; else if (status & ALTERA_UART_STATUS_PE_MSK) flag = TTY_PARITY; else if (status & ALTERA_UART_STATUS_FE_MSK) flag = TTY_FRAME; } if (uart_handle_sysrq_char(port, ch)) continue; uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch, flag); } spin_unlock(&port->lock); tty_flip_buffer_push(&port->state->port); spin_lock(&port->lock); }
static void altera_uart_tx_chars(struct altera_uart *pp) { struct uart_port *port = &pp->port; struct circ_buf *xmit = &port->state->xmit; if (port->x_char) { /* Send special char - probably flow control */ altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG); port->x_char = 0; port->icount.tx++; return; } while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TRDY_MSK) { if (xmit->head == xmit->tail) break; altera_uart_writel(port, xmit->buf[xmit->tail], ALTERA_UART_TXDATA_REG); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; } if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(port); if (xmit->head == xmit->tail) { pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); } }
static void altera_uart_console_putc(struct uart_port *port, const char c) { while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TRDY_MSK)) cpu_relax(); writel(c, port->membase + ALTERA_UART_TXDATA_REG); }
static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c) { while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TRDY_MSK)) cpu_relax(); altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG); }
static unsigned int altera_uart_get_mctrl(struct uart_port *port) { struct altera_uart *pp = container_of(port, struct altera_uart, port); unsigned int sigs; sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0; sigs |= (pp->sigs & TIOCM_RTS); return sigs; }
static irqreturn_t altera_uart_interrupt(int irq, void *data) { struct uart_port *port = data; struct altera_uart *pp = container_of(port, struct altera_uart, port); unsigned int isr; isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr; spin_lock(&port->lock); if (isr & ALTERA_UART_STATUS_RRDY_MSK) altera_uart_rx_chars(pp); if (isr & ALTERA_UART_STATUS_TRDY_MSK) altera_uart_tx_chars(pp); spin_unlock(&port->lock); return IRQ_RETVAL(isr); }
static unsigned int altera_uart_tx_empty(struct uart_port *port) { return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) & ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0; }