/*
* Set baud rate. The settings are always 8n1:
* 8 data bits, no parity, 1 stop bit
*/
void mxs_serial_setbrg(void)
{
u32 div;
u32 linectrl = 0;
/* Calculate and set baudrate */
div = (CONFIG_UARTAPP_CLK * 32) / gd->baudrate;
linectrl |= BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(div & 0x3F);
linectrl |= BF_UARTAPP_LINECTRL_BAUD_DIVINT(div >> 6);
linectrl |= BF_UARTAPP_LINECTRL_WLEN(3); /* 8 bit */
linectrl |= BM_UARTAPP_LINECTRL_FEN; /* enable fifo */
REG_WR(MXS_UARTAPP_BASE, HW_UARTAPP_LINECTRL, linectrl);
}
static void stmp_appuart_settermios(struct uart_port *u,
struct ktermios *nw, struct ktermios *old)
{
static struct ktermios saved;
struct stmp_appuart_port *s = to_appuart(u);
unsigned int cflag;
u32 bm, ctrl, ctrl2, div;
int err = 0;
unsigned baud;
dev_dbg(s->dev, "%s\n", __func__);
if (nw)
memcpy(&saved, nw, sizeof *nw);
else
nw = old = &saved;
cflag = nw->c_cflag;
ctrl = BM_UARTAPP_LINECTRL_FEN;
ctrl2 = HW_UARTAPP_CTRL2_RD_NB(s->mem);
/* byte size */
switch (cflag & CSIZE) {
case CS5: bm = 0; break;
case CS6: bm = 1; break;
case CS7: bm = 2; break;
case CS8: bm = 3; break;
default: err = -EINVAL; break;
}
if (err)
goto out;
dev_dbg(s->dev, "Byte size %d bytes, mask %x\n",
bm + 5, BF_UARTAPP_LINECTRL_WLEN(bm));
ctrl |= BF_UARTAPP_LINECTRL_WLEN(bm);
/* parity */
if (cflag & PARENB) {
dev_dbg(s->dev, "Parity check enabled\n");
ctrl |= BM_UARTAPP_LINECTRL_PEN | BM_UARTAPP_LINECTRL_SPS;
if ((cflag & PARODD) == 0) {
dev_dbg(s->dev, "(Even) mask = %x\n",
BM_UARTAPP_LINECTRL_PEN |
BM_UARTAPP_LINECTRL_SPS |
BM_UARTAPP_LINECTRL_EPS);
ctrl |= BM_UARTAPP_LINECTRL_EPS;
} else
dev_dbg(s->dev, "(Odd) mask = %x\n",
BM_UARTAPP_LINECTRL_PEN |
BM_UARTAPP_LINECTRL_SPS);
} else
dev_dbg(s->dev, "Parity check disabled.\n");
/* figure out the stop bits requested */
if (cflag & CSTOPB) {
dev_dbg(s->dev, "Stop bits, mask = %x\n",
BM_UARTAPP_LINECTRL_STP2);
ctrl |= BM_UARTAPP_LINECTRL_STP2;
} else
dev_dbg(s->dev, "No stop bits\n");
/* figure out the hardware flow control settings */
if (cflag & CRTSCTS) {
dev_dbg(s->dev, "RTS/CTS flow control\n");
ctrl2 |= BM_UARTAPP_CTRL2_CTSEN /* | BM_UARTAPP_CTRL2_RTSEN */;
} else {
dev_dbg(s->dev, "RTS/CTS disabled\n");
ctrl2 &= ~BM_UARTAPP_CTRL2_CTSEN;
}
/* set baud rate */
baud = uart_get_baud_rate(u, nw, old, 0, u->uartclk);
dev_dbg(s->dev, "Baud rate requested: %d (clk = %d)\n",
baud, u->uartclk);
div = u->uartclk * 32 / baud;
ctrl |= BF_UARTAPP_LINECTRL_BAUD_DIVFRAC(div & 0x3F);
ctrl |= BF_UARTAPP_LINECTRL_BAUD_DIVINT(div >> 6);
if ((cflag & CREAD) != 0) {
dev_dbg(s->dev, "RX started\n");
ctrl2 |= BM_UARTAPP_CTRL2_RXE | BM_UARTAPP_CTRL2_RXDMAE;
}
if (!err) {
dev_dbg(s->dev, "CTRLS = %x + %x\n", ctrl, ctrl2);
HW_UARTAPP_LINECTRL_WR_NB(s->mem, ctrl);
HW_UARTAPP_CTRL2_WR_NB(s->mem, ctrl2);
}
out:
return /* err */;
}
