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Calculate the baud rate divisor rather than using a hard-coded value.

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Submitted by:	Steven Lawrance <stl@koffein.net>
This commit is contained in:
Ian Lepore 2013-10-20 23:40:16 +00:00
parent 58ac6f25fa
commit 6dd028d8f8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=256815
1 changed files with 5 additions and 5 deletions
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10
sys/dev/uart/uart_dev_pl011.c
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@ -147,9 +147,6 @@ uart_pl011_param(struct uart_bas *bas, int baudrate, int databits, int stopbits,
break;
}
/* TODO: Calculate divisors */
baud = (0x1 << 16) | 0x28;
if (stopbits == 2)
line |= LCR_H_STP2;
else
@ -164,8 +161,11 @@ uart_pl011_param(struct uart_bas *bas, int baudrate, int databits, int stopbits,
line &= ~LCR_H_FEN;
ctrl |= (CR_RXE | CR_TXE | CR_UARTEN);
__uart_setreg(bas, UART_IBRD, ((uint32_t)(baud >> 16)) & IBRD_BDIVINT);
__uart_setreg(bas, UART_FBRD, (uint32_t)(baud) & FBRD_BDIVFRAC);
if (bas->rclk != 0 && baudrate != 0) {
baud = bas->rclk * 4 / baudrate;
__uart_setreg(bas, UART_IBRD, ((uint32_t)(baud >> 6)) & IBRD_BDIVINT);
__uart_setreg(bas, UART_FBRD, (uint32_t)(baud & 0x3F) & FBRD_BDIVFRAC);
}
/* Add config. to line before reenabling UART */
__uart_setreg(bas, UART_LCR_H, (__uart_getreg(bas, UART_LCR_H) &