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tty: serial: meson: Add support for XTAL clock input

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Fix the baudrate calculation for 24 MHz XTAL clock found on gxbb platforms.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Färber 2016-02-08 13:49:42 +01:00 committed by Greg Kroah-Hartman
parent df247081af
commit 146f3808e0
1 changed files with 7 additions and 1 deletions
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8
drivers/tty/serial/meson_uart.c
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@ -78,6 +78,7 @@
/* AML_UART_REG5 bits */
#define AML_UART_BAUD_MASK 0x7fffff
#define AML_UART_BAUD_USE BIT(23)
#define AML_UART_BAUD_XTAL BIT(24)
#define AML_UART_PORT_NUM 6
#define AML_UART_DEV_NAME "ttyAML"
@ -299,7 +300,12 @@ static void meson_uart_change_speed(struct uart_port *port, unsigned long baud)
val = readl(port->membase + AML_UART_REG5);
val &= ~AML_UART_BAUD_MASK;
val = ((port->uartclk * 10 / (baud * 4) + 5) / 10) - 1;
if (port->uartclk == 24000000) {
val = ((port->uartclk / 3) / baud) - 1;
val |= AML_UART_BAUD_XTAL;
} else {
val = ((port->uartclk * 10 / (baud * 4) + 5) / 10) - 1;
}
val |= AML_UART_BAUD_USE;
writel(val, port->membase + AML_UART_REG5);
}