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Calculate the baud rate divisor rather than using a hard-coded value.
Submitted by: Steven Lawrance <stl@koffein.net>
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parent
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=256815
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@ -147,9 +147,6 @@ uart_pl011_param(struct uart_bas *bas, int baudrate, int databits, int stopbits,
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break;
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}
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/* TODO: Calculate divisors */
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baud = (0x1 << 16) | 0x28;
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if (stopbits == 2)
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line |= LCR_H_STP2;
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else
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@ -164,8 +161,11 @@ uart_pl011_param(struct uart_bas *bas, int baudrate, int databits, int stopbits,
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line &= ~LCR_H_FEN;
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ctrl |= (CR_RXE | CR_TXE | CR_UARTEN);
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__uart_setreg(bas, UART_IBRD, ((uint32_t)(baud >> 16)) & IBRD_BDIVINT);
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__uart_setreg(bas, UART_FBRD, (uint32_t)(baud) & FBRD_BDIVFRAC);
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if (bas->rclk != 0 && baudrate != 0) {
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baud = bas->rclk * 4 / baudrate;
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__uart_setreg(bas, UART_IBRD, ((uint32_t)(baud >> 6)) & IBRD_BDIVINT);
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__uart_setreg(bas, UART_FBRD, (uint32_t)(baud & 0x3F) & FBRD_BDIVFRAC);
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}
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/* Add config. to line before reenabling UART */
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__uart_setreg(bas, UART_LCR_H, (__uart_getreg(bas, UART_LCR_H) &
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