serial: 8250_fintek: UART dynamic clocksource on Fintek F81866

The F81866 had 4 clocksource 1.8432/18.432/14.769/24MHz and baud rates can
be up to 1.5Mbits with 24MHz. We'll implements the dynamic clocksource in
fintek_8250_set_termios().

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index e500f7d..53ea353 100644 (file)
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -287,6 +287,59 @@ static void fintek_8250_goto_highspeed(struct uart_8250_port *uart,
        }
 }
 
+void fintek_8250_set_termios(struct uart_port *port, struct ktermios *termios,
+                       struct ktermios *old)
+{
+       struct fintek_8250 *pdata = port->private_data;
+       unsigned int baud = tty_termios_baud_rate(termios);
+       int i;
+       static u32 baudrate_table[] = {115200, 921600, 1152000, 1500000};
+       static u8 clock_table[] = { F81866_UART_CLK_1_8432MHZ,
+                       F81866_UART_CLK_14_769MHZ, F81866_UART_CLK_18_432MHZ,
+                       F81866_UART_CLK_24MHZ };
+
+       for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
+               if (baud > baudrate_table[i] || baudrate_table[i] % baud != 0)
+                       continue;
+
+               if (port->uartclk == baudrate_table[i] * 16)
+                       break;
+
+               if (fintek_8250_enter_key(pdata->base_port, pdata->key))
+                       continue;
+
+               port->uartclk = baudrate_table[i] * 16;
+
+               sio_write_reg(pdata, LDN, pdata->index);
+               sio_write_mask_reg(pdata, F81866_UART_CLK,
+                               F81866_UART_CLK_MASK, clock_table[i]);
+
+               fintek_8250_exit_key(pdata->base_port);
+               break;
+       }
+
+       if (i == ARRAY_SIZE(baudrate_table)) {
+               baud = tty_termios_baud_rate(old);
+               tty_termios_encode_baud_rate(termios, baud, baud);
+       }
+
+       serial8250_do_set_termios(port, termios, old);
+}
+
+static void fintek_8250_set_termios_handler(struct uart_8250_port *uart)
+{
+       struct fintek_8250 *pdata = uart->port.private_data;
+
+       switch (pdata->pid) {
+       case CHIP_ID_F81866:
+               uart->port.set_termios = fintek_8250_set_termios;
+               break;
+
+       default:
+               break;
+       }
+}
+
 static int probe_setup_port(struct fintek_8250 *pdata,
                                        struct uart_8250_port *uart)
 {
@@ -373,6 +426,7 @@ int fintek_8250_probe(struct uart_8250_port *uart)
        memcpy(pdata, &probe_data, sizeof(probe_data));
        uart->port.private_data = pdata;
        fintek_8250_set_rs485_handler(uart);
+       fintek_8250_set_termios_handler(uart);
 
        return 0;
 }