forked from Minki/linux
serial: mfd: add more baud rates support
Add more baud rates support referring the baud_table[] defined in drivers/char/tty_ioctl.c: 3000000/2000000/1000000/500000 Signed-off-by: Feng Tang <feng.tang@intel.com> Acked-by: Alan Cox <alan.cox@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -929,39 +929,52 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
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cval |= UART_LCR_EPAR;
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/*
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* The base clk is 50Mhz, and the baud rate come from:
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* baud = 50M * MUL / (DIV * PS * DLAB)
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*
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* For those basic low baud rate we can get the direct
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* scalar from 2746800, like 115200 = 2746800/24, for those
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* higher baud rate, we have to handle them case by case,
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* but DIV reg is never touched as its default value 0x3d09
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* scalar from 2746800, like 115200 = 2746800/24. For those
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* higher baud rate, we handle them case by case, mainly by
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* adjusting the MUL/PS registers, and DIV register is kept
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* as default value 0x3d09 to make things simple
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*/
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baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
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quot = uart_get_divisor(port, baud);
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quot = 1;
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switch (baud) {
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case 3500000:
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mul = 0x3345;
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ps = 0xC;
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quot = 1;
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break;
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case 3000000:
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mul = 0x2EE0;
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break;
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case 2500000:
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mul = 0x2710;
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ps = 0x10;
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quot = 1;
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break;
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case 18432000:
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case 2000000:
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mul = 0x1F40;
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break;
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case 1843200:
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mul = 0x2400;
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ps = 0x10;
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quot = 1;
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break;
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case 1500000:
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mul = 0x1D4C;
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ps = 0xc;
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quot = 1;
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mul = 0x1770;
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break;
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case 1000000:
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mul = 0xFA0;
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break;
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case 500000:
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mul = 0x7D0;
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break;
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default:
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;
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/* Use uart_get_divisor to get quot for other baud rates */
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quot = 0;
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}
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if (!quot)
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quot = uart_get_divisor(port, baud);
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if ((up->port.uartclk / quot) < (2400 * 16))
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fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B;
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else if ((up->port.uartclk / quot) < (230400 * 16))
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