void octeon_set_baud(uint32_t uart, uint32_t baud)
{
uint16_t divisor;
uint8_t uart_index = GET_UART_INDEX(uart);
uint8_t node = GET_UART_NODE(uart);
cvmx_uart_lcr_t lcrval;
divisor = compute_divisor(octeon_get_ioclk_hz(), baud);
lcrval.u64 = cvmx_read_csr_node(node, CVMX_MIO_UARTX_LCR(uart_index));
cvmx_wait((2 * divisor * 16) + 10000);
lcrval.s.dlab = 1; /* temporary to program the divisor */
cvmx_write_csr_node(node, CVMX_MIO_UARTX_LCR(uart_index), lcrval.u64);
cvmx_write_csr_node(node, CVMX_MIO_UARTX_DLL(uart_index), divisor & 0xff);
cvmx_write_csr_node(node, CVMX_MIO_UARTX_DLH(uart_index), (divisor >> 8) & 0xff);
/* divisor is programmed now, set this back to normal */
lcrval.s.dlab = 0;
cvmx_write_csr_node(node, CVMX_MIO_UARTX_LCR(uart_index), lcrval.u64);
#ifndef CONFIG_OCTEON_SIM_SPEED
/* spec says need to wait after you program the divisor */
cvmx_wait((2 * divisor * 16) + 10000);
/* Wait a little longer..... */
mdelay(5);
#endif
}
int uart_configure(unsigned int uart_num, uint32_t baudrate)
{
UxMODE(uart_num) = 0;
UxSTA(uart_num) = 0;
return compute_divisor(uart_num, baudrate);
}
/**
* Function that does the real work of setting up the Octeon uart.
* Takes all parameters as arguments, so it does not require gd
* structure to be set up.
*
* @param uart_index Index of uart to configure
* @param cpu_clock_hertz
* CPU clock frequency in Hz
* @param baudrate Baudrate to configure
*
* @return 0 on success
* !0 on error
*/
int octeon_uart_setup2(int uart, int cpu_clock_hertz, int baudrate)
{
uint16_t divisor;
cvmx_uart_fcr_t fcrval;
cvmx_uart_mcr_t mcrval;
cvmx_uart_lcr_t lcrval;
uint8_t uart_index = GET_UART_INDEX(uart);
uint8_t node = GET_UART_NODE(uart);
#if !CONFIG_OCTEON_SIM_SPEED
uint64_t read_cycle;
#endif
fcrval.u64 = 0;
fcrval.s.en = 1; /* enable the FIFO's */
fcrval.s.rxfr = 1; /* reset the RX fifo */
fcrval.s.txfr = 1; /* reset the TX fifo */
divisor = compute_divisor(cpu_clock_hertz, baudrate);
cvmx_write_csr_node(node, CVMX_MIO_UARTX_FCR(uart_index), fcrval.u64);
mcrval.u64 = 0;
#if CONFIG_OCTEON_SIM_SETUP
if (uart_index == 1)
mcrval.s.afce = 1; /* enable auto flow control for
* simulator. Needed for gdb
* regression callfuncs.exp.
*/
else
mcrval.s.afce = 0; /* disable auto flow control so board
* can power on without serial port
* connected
*/
#else
mcrval.s.afce = 0; /* disable auto flow control so board can power
* on without serial port connected
*/
#endif
mcrval.s.rts = 1; /* looks like this must be set for auto flow
* control to work
*/
cvmx_read_csr_node(node, CVMX_MIO_UARTX_LSR(uart_index));
lcrval.u64 = 0;
lcrval.s.cls = CVMX_UART_BITS8;
lcrval.s.stop = 0; /* stop bit included? */
lcrval.s.pen = 0; /* no parity? */
lcrval.s.eps = 1; /* even parity? */
lcrval.s.dlab = 1; /* temporary to program the divisor */
cvmx_write_csr_node(node, CVMX_MIO_UARTX_LCR(uart_index), lcrval.u64);
cvmx_write_csr_node(node, CVMX_MIO_UARTX_DLL(uart_index), divisor & 0xff);
cvmx_write_csr_node(node, CVMX_MIO_UARTX_DLH(uart_index), (divisor >> 8) & 0xff);
/* divisor is programmed now, set this back to normal */
lcrval.s.dlab = 0;
cvmx_write_csr_node(node, CVMX_MIO_UARTX_LCR(uart_index), lcrval.u64);
#if !CONFIG_OCTEON_SIM_SPEED
/* spec says need to wait after you program the divisor */
read_cycle = octeon_get_cycles() + (2 * divisor * 16) + 10000;
while (octeon_get_cycles() < read_cycle) {
/* Spin */
}
#endif
/* Don't enable flow control until after baud rate is configured. - we
* don't want to allow characters in until after the baud rate is
* fully configured
*/
cvmx_write_csr_node(node, CVMX_MIO_UARTX_MCR(uart_index), mcrval.u64);
return 0;
}
