/**
* cdns_uart_console_write - perform write operation
* @co: Console handle
* @s: Pointer to character array
* @count: No of characters
*/
static void cdns_uart_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_port *port = &cdns_uart_port[co->index];
unsigned long flags;
unsigned int imr, ctrl;
int locked = 1;
if (port->sysrq)
locked = 0;
else if (oops_in_progress)
locked = spin_trylock_irqsave(&port->lock, flags);
else
spin_lock_irqsave(&port->lock, flags);
/* save and disable interrupt */
imr = readl(port->membase + CDNS_UART_IMR);
writel(imr, port->membase + CDNS_UART_IDR);
/*
* Make sure that the tx part is enabled. Set the TX enable bit and
* clear the TX disable bit to enable the transmitter.
*/
ctrl = readl(port->membase + CDNS_UART_CR);
ctrl &= ~CDNS_UART_CR_TX_DIS;
ctrl |= CDNS_UART_CR_TX_EN;
writel(ctrl, port->membase + CDNS_UART_CR);
uart_console_write(port, s, count, cdns_uart_console_putchar);
cdns_uart_console_wait_tx(port);
writel(ctrl, port->membase + CDNS_UART_CR);
/* restore interrupt state */
writel(imr, port->membase + CDNS_UART_IER);
if (locked)
spin_unlock_irqrestore(&port->lock, flags);
}
/**
* cdns_uart_console_putchar - write the character to the FIFO buffer
* @port: Handle to the uart port structure
* @ch: Character to be written
*/
static void cdns_uart_console_putchar(struct uart_port *port, int ch)
{
cdns_uart_console_wait_tx(port);
cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET);
}
/**
* cdns_uart_console_putchar - write the character to the FIFO buffer
* @port: Handle to the uart port structure
* @ch: Character to be written
*/
static void cdns_uart_console_putchar(struct uart_port *port, int ch)
{
cdns_uart_console_wait_tx(port);
writel(ch, port->membase + CDNS_UART_FIFO);
}
