/*
* Set the UART's baud rate. The calculation is:
* (baud * 16) / ref_freq = num/demom
*
* ref_freq = perclk1 / RFDIV[2:0]
* BIR = num - 1
* BMR = demom - 1
*
* Setting 'num' to 16 yields this equation:
* demom = ref_freq / baud
*/
static void imx_uart_set_baud(int minor, int baud)
{
unsigned int perclk1;
unsigned int denom;
unsigned int ref_freq = 0;
uint32_t fcr;
perclk1 = get_perclk1_freq();
fcr = imx_uart_data[minor].regs->fcr;
switch(fcr & MC9328MXL_UART_FCR_RFDIV_MASK) {
case MC9328MXL_UART_FCR_RFDIV_1: ref_freq = perclk1/1; break;
case MC9328MXL_UART_FCR_RFDIV_2: ref_freq = perclk1/2; break;
case MC9328MXL_UART_FCR_RFDIV_3: ref_freq = perclk1/3; break;
case MC9328MXL_UART_FCR_RFDIV_4: ref_freq = perclk1/4; break;
case MC9328MXL_UART_FCR_RFDIV_5: ref_freq = perclk1/5; break;
case MC9328MXL_UART_FCR_RFDIV_6: ref_freq = perclk1/6; break;
case MC9328MXL_UART_FCR_RFDIV_7: ref_freq = perclk1/7; break;
default:
rtems_panic("%s:%d Unknown RFDIV: 0x%x",
__FUNCTION__, __LINE__,
fcr & MC9328MXL_UART_FCR_RFDIV_MASK);
break;
}
denom = ref_freq / baud;
imx_uart_data[minor].regs->bir = 0xf;
imx_uart_data[minor].regs->bmr = denom;
}
/*
* Set up Timer 1
*/
void Timer_initialize( void )
{
MC9328MXL_TMR2_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 |
MC9328MXL_TMR_TCTL_FRR |
MC9328MXL_TMR_TCTL_TEN);
/* set prescaler to 1 (register value + 1) */ \
MC9328MXL_TMR2_TPRER = 0;
/* get freq of counter in KHz */
g_freq = get_perclk1_freq() / 1000;
g_start = MC9328MXL_TMR2_TCN;
}
