/*
* Freescale lpuart serial port driver
*
- * Copyright 2012-2013 Freescale Semiconductor, Inc.
+ * Copyright 2012-2014 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#define UARTSFIFO_TXOF 0x02
#define UARTSFIFO_RXUF 0x01
+/* 32-bit register defination */
+#define UARTBAUD 0x00
+#define UARTSTAT 0x04
+#define UARTCTRL 0x08
+#define UARTDATA 0x0C
+#define UARTMATCH 0x10
+#define UARTMODIR 0x14
+#define UARTFIFO 0x18
+#define UARTWATER 0x1c
+
+#define UARTBAUD_MAEN1 0x80000000
+#define UARTBAUD_MAEN2 0x40000000
+#define UARTBAUD_M10 0x20000000
+#define UARTBAUD_TDMAE 0x00800000
+#define UARTBAUD_RDMAE 0x00200000
+#define UARTBAUD_MATCFG 0x00400000
+#define UARTBAUD_BOTHEDGE 0x00020000
+#define UARTBAUD_RESYNCDIS 0x00010000
+#define UARTBAUD_LBKDIE 0x00008000
+#define UARTBAUD_RXEDGIE 0x00004000
+#define UARTBAUD_SBNS 0x00002000
+#define UARTBAUD_SBR 0x00000000
+#define UARTBAUD_SBR_MASK 0x1fff
+
+#define UARTSTAT_LBKDIF 0x80000000
+#define UARTSTAT_RXEDGIF 0x40000000
+#define UARTSTAT_MSBF 0x20000000
+#define UARTSTAT_RXINV 0x10000000
+#define UARTSTAT_RWUID 0x08000000
+#define UARTSTAT_BRK13 0x04000000
+#define UARTSTAT_LBKDE 0x02000000
+#define UARTSTAT_RAF 0x01000000
+#define UARTSTAT_TDRE 0x00800000
+#define UARTSTAT_TC 0x00400000
+#define UARTSTAT_RDRF 0x00200000
+#define UARTSTAT_IDLE 0x00100000
+#define UARTSTAT_OR 0x00080000
+#define UARTSTAT_NF 0x00040000
+#define UARTSTAT_FE 0x00020000
+#define UARTSTAT_PE 0x00010000
+#define UARTSTAT_MA1F 0x00008000
+#define UARTSTAT_M21F 0x00004000
+
+#define UARTCTRL_R8T9 0x80000000
+#define UARTCTRL_R9T8 0x40000000
+#define UARTCTRL_TXDIR 0x20000000
+#define UARTCTRL_TXINV 0x10000000
+#define UARTCTRL_ORIE 0x08000000
+#define UARTCTRL_NEIE 0x04000000
+#define UARTCTRL_FEIE 0x02000000
+#define UARTCTRL_PEIE 0x01000000
+#define UARTCTRL_TIE 0x00800000
+#define UARTCTRL_TCIE 0x00400000
+#define UARTCTRL_RIE 0x00200000
+#define UARTCTRL_ILIE 0x00100000
+#define UARTCTRL_TE 0x00080000
+#define UARTCTRL_RE 0x00040000
+#define UARTCTRL_RWU 0x00020000
+#define UARTCTRL_SBK 0x00010000
+#define UARTCTRL_MA1IE 0x00008000
+#define UARTCTRL_MA2IE 0x00004000
+#define UARTCTRL_IDLECFG 0x00000100
+#define UARTCTRL_LOOPS 0x00000080
+#define UARTCTRL_DOZEEN 0x00000040
+#define UARTCTRL_RSRC 0x00000020
+#define UARTCTRL_M 0x00000010
+#define UARTCTRL_WAKE 0x00000008
+#define UARTCTRL_ILT 0x00000004
+#define UARTCTRL_PE 0x00000002
+#define UARTCTRL_PT 0x00000001
+
+#define UARTDATA_NOISY 0x00008000
+#define UARTDATA_PARITYE 0x00004000
+#define UARTDATA_FRETSC 0x00002000
+#define UARTDATA_RXEMPT 0x00001000
+#define UARTDATA_IDLINE 0x00000800
+#define UARTDATA_MASK 0x3ff
+
+#define UARTMODIR_IREN 0x00020000
+#define UARTMODIR_TXCTSSRC 0x00000020
+#define UARTMODIR_TXCTSC 0x00000010
+#define UARTMODIR_RXRTSE 0x00000008
+#define UARTMODIR_TXRTSPOL 0x00000004
+#define UARTMODIR_TXRTSE 0x00000002
+#define UARTMODIR_TXCTSE 0x00000001
+
+#define UARTFIFO_TXEMPT 0x00800000
+#define UARTFIFO_RXEMPT 0x00400000
+#define UARTFIFO_TXOF 0x00020000
+#define UARTFIFO_RXUF 0x00010000
+#define UARTFIFO_TXFLUSH 0x00008000
+#define UARTFIFO_RXFLUSH 0x00004000
+#define UARTFIFO_TXOFE 0x00000200
+#define UARTFIFO_RXUFE 0x00000100
+#define UARTFIFO_TXFE 0x00000080
+#define UARTFIFO_FIFOSIZE_MASK 0x7
+#define UARTFIFO_TXSIZE_OFF 4
+#define UARTFIFO_RXFE 0x00000008
+#define UARTFIFO_RXSIZE_OFF 0
+
+#define UARTWATER_COUNT_MASK 0xff
+#define UARTWATER_TXCNT_OFF 8
+#define UARTWATER_RXCNT_OFF 24
+#define UARTWATER_WATER_MASK 0xff
+#define UARTWATER_TXWATER_OFF 0
+#define UARTWATER_RXWATER_OFF 16
+
#define FSL_UART_RX_DMA_BUFFER_SIZE 64
#define DRIVER_NAME "fsl-lpuart"
struct clk *clk;
unsigned int txfifo_size;
unsigned int rxfifo_size;
+ bool lpuart32;
bool lpuart_dma_use;
struct dma_chan *dma_tx_chan;
{
.compatible = "fsl,vf610-lpuart",
},
+ {
+ .compatible = "fsl,ls1021a-lpuart",
+ },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
static void lpuart_dma_tx_complete(void *arg);
static void lpuart_dma_rx_complete(void *arg);
+static u32 lpuart32_read(void __iomem *addr)
+{
+ return ioread32be(addr);
+}
+
+static void lpuart32_write(u32 val, void __iomem *addr)
+{
+ iowrite32be(val, addr);
+}
+
static void lpuart_stop_tx(struct uart_port *port)
{
unsigned char temp;
writeb(temp, port->membase + UARTCR2);
}
+static void lpuart32_stop_tx(struct uart_port *port)
+{
+ unsigned long temp;
+
+ temp = lpuart32_read(port->membase + UARTCTRL);
+ temp &= ~(UARTCTRL_TIE | UARTCTRL_TCIE);
+ lpuart32_write(temp, port->membase + UARTCTRL);
+}
+
static void lpuart_stop_rx(struct uart_port *port)
{
unsigned char temp;
writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2);
}
+static void lpuart32_stop_rx(struct uart_port *port)
+{
+ unsigned long temp;
+
+ temp = lpuart32_read(port->membase + UARTCTRL);
+ lpuart32_write(temp & ~UARTCTRL_RE, port->membase + UARTCTRL);
+}
+
static void lpuart_copy_rx_to_tty(struct lpuart_port *sport,
struct tty_port *tty, int count)
{
lpuart_stop_tx(&sport->port);
}
+static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
+{
+ struct circ_buf *xmit = &sport->port.state->xmit;
+ unsigned long txcnt;
+
+ txcnt = lpuart32_read(sport->port.membase + UARTWATER);
+ txcnt = txcnt >> UARTWATER_TXCNT_OFF;
+ txcnt &= UARTWATER_COUNT_MASK;
+ while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) {
+ lpuart32_write(xmit->buf[xmit->tail], sport->port.membase + UARTDATA);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ sport->port.icount.tx++;
+ txcnt = lpuart32_read(sport->port.membase + UARTWATER);
+ txcnt = txcnt >> UARTWATER_TXCNT_OFF;
+ txcnt &= UARTWATER_COUNT_MASK;
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&sport->port);
+
+ if (uart_circ_empty(xmit))
+ lpuart32_stop_tx(&sport->port);
+}
+
static void lpuart_start_tx(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
}
}
+static void lpuart32_start_tx(struct uart_port *port)
+{
+ struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+ unsigned long temp;
+
+ temp = lpuart32_read(port->membase + UARTCTRL);
+ lpuart32_write(temp | UARTCTRL_TIE, port->membase + UARTCTRL);
+
+ if (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE)
+ lpuart32_transmit_buffer(sport);
+}
+
static irqreturn_t lpuart_txint(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
spin_lock_irqsave(&sport->port.lock, flags);
if (sport->port.x_char) {
- writeb(sport->port.x_char, sport->port.membase + UARTDR);
+ if (sport->lpuart32)
+ lpuart32_write(sport->port.x_char, sport->port.membase + UARTDATA);
+ else
+ writeb(sport->port.x_char, sport->port.membase + UARTDR);
goto out;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
- lpuart_stop_tx(&sport->port);
+ if (sport->lpuart32)
+ lpuart32_stop_tx(&sport->port);
+ else
+ lpuart_stop_tx(&sport->port);
goto out;
}
- lpuart_transmit_buffer(sport);
+ if (sport->lpuart32)
+ lpuart32_transmit_buffer(sport);
+ else
+ lpuart_transmit_buffer(sport);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
return IRQ_HANDLED;
}
+static irqreturn_t lpuart32_rxint(int irq, void *dev_id)
+{
+ struct lpuart_port *sport = dev_id;
+ unsigned int flg, ignored = 0;
+ struct tty_port *port = &sport->port.state->port;
+ unsigned long flags;
+ unsigned long rx, sr;
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+
+ while (!(lpuart32_read(sport->port.membase + UARTFIFO) & UARTFIFO_RXEMPT)) {
+ flg = TTY_NORMAL;
+ sport->port.icount.rx++;
+ /*
+ * to clear the FE, OR, NF, FE, PE flags,
+ * read STAT then read DATA reg
+ */
+ sr = lpuart32_read(sport->port.membase + UARTSTAT);
+ rx = lpuart32_read(sport->port.membase + UARTDATA);
+ rx &= 0x3ff;
+
+ if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
+ continue;
+
+ if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
+ if (sr & UARTSTAT_PE)
+ sport->port.icount.parity++;
+ else if (sr & UARTSTAT_FE)
+ sport->port.icount.frame++;
+
+ if (sr & UARTSTAT_OR)
+ sport->port.icount.overrun++;
+
+ if (sr & sport->port.ignore_status_mask) {
+ if (++ignored > 100)
+ goto out;
+ continue;
+ }
+
+ sr &= sport->port.read_status_mask;
+
+ if (sr & UARTSTAT_PE)
+ flg = TTY_PARITY;
+ else if (sr & UARTSTAT_FE)
+ flg = TTY_FRAME;
+
+ if (sr & UARTSTAT_OR)
+ flg = TTY_OVERRUN;
+
+#ifdef SUPPORT_SYSRQ
+ sport->port.sysrq = 0;
+#endif
+ }
+
+ tty_insert_flip_char(port, rx, flg);
+ }
+
+out:
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+
+ tty_flip_buffer_push(port);
+ return IRQ_HANDLED;
+}
+
static irqreturn_t lpuart_int(int irq, void *dev_id)
{
struct lpuart_port *sport = dev_id;
return IRQ_HANDLED;
}
+static irqreturn_t lpuart32_int(int irq, void *dev_id)
+{
+ struct lpuart_port *sport = dev_id;
+ unsigned long sts, rxcount;
+
+ sts = lpuart32_read(sport->port.membase + UARTSTAT);
+ rxcount = lpuart32_read(sport->port.membase + UARTWATER);
+ rxcount = rxcount >> UARTWATER_RXCNT_OFF;
+
+ if (sts & UARTSTAT_RDRF || rxcount > 0)
+ lpuart32_rxint(irq, dev_id);
+
+ if ((sts & UARTSTAT_TDRE) &&
+ !(lpuart32_read(sport->port.membase + UARTBAUD) & UARTBAUD_TDMAE))
+ lpuart_txint(irq, dev_id);
+
+ lpuart32_write(sts, sport->port.membase + UARTSTAT);
+ return IRQ_HANDLED;
+}
+
/* return TIOCSER_TEMT when transmitter is not busy */
static unsigned int lpuart_tx_empty(struct uart_port *port)
{
TIOCSER_TEMT : 0;
}
+static unsigned int lpuart32_tx_empty(struct uart_port *port)
+{
+ return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ?
+ TIOCSER_TEMT : 0;
+}
+
static unsigned int lpuart_get_mctrl(struct uart_port *port)
{
unsigned int temp = 0;
return temp;
}
+static unsigned int lpuart32_get_mctrl(struct uart_port *port)
+{
+ unsigned int temp = 0;
+ unsigned long reg;
+
+ reg = lpuart32_read(port->membase + UARTMODIR);
+ if (reg & UARTMODIR_TXCTSE)
+ temp |= TIOCM_CTS;
+
+ if (reg & UARTMODIR_RXRTSE)
+ temp |= TIOCM_RTS;
+
+ return temp;
+}
+
static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
unsigned char temp;
writeb(temp, port->membase + UARTMODEM);
}
+static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ unsigned long temp;
+
+ temp = lpuart32_read(port->membase + UARTMODIR) &
+ ~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
+
+ if (mctrl & TIOCM_RTS)
+ temp |= UARTMODIR_RXRTSE;
+
+ if (mctrl & TIOCM_CTS)
+ temp |= UARTMODIR_TXCTSE;
+
+ lpuart32_write(temp, port->membase + UARTMODIR);
+}
+
static void lpuart_break_ctl(struct uart_port *port, int break_state)
{
unsigned char temp;
writeb(temp, port->membase + UARTCR2);
}
+static void lpuart32_break_ctl(struct uart_port *port, int break_state)
+{
+ unsigned long temp;
+
+ temp = lpuart32_read(port->membase + UARTCTRL) & ~UARTCTRL_SBK;
+
+ if (break_state != 0)
+ temp |= UARTCTRL_SBK;
+
+ lpuart32_write(temp, port->membase + UARTCTRL);
+}
+
static void lpuart_setup_watermark(struct lpuart_port *sport)
{
unsigned char val, cr2;
writeb(cr2_saved, sport->port.membase + UARTCR2);
}
+static void lpuart32_setup_watermark(struct lpuart_port *sport)
+{
+ unsigned long val, ctrl;
+ unsigned long ctrl_saved;
+
+ ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
+ ctrl_saved = ctrl;
+ ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE |
+ UARTCTRL_RIE | UARTCTRL_RE);
+ lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
+
+ /* enable FIFO mode */
+ val = lpuart32_read(sport->port.membase + UARTFIFO);
+ val |= UARTFIFO_TXFE | UARTFIFO_RXFE;
+ val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
+ lpuart32_write(val, sport->port.membase + UARTFIFO);
+
+ /* set the watermark */
+ val = (0x1 << UARTWATER_RXWATER_OFF) | (0x0 << UARTWATER_TXWATER_OFF);
+ lpuart32_write(val, sport->port.membase + UARTWATER);
+
+ /* Restore cr2 */
+ lpuart32_write(ctrl_saved, sport->port.membase + UARTCTRL);
+}
+
static int lpuart_dma_tx_request(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port,
return 0;
}
+static int lpuart32_startup(struct uart_port *port)
+{
+ struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+ int ret;
+ unsigned long flags;
+ unsigned long temp;
+
+ /* determine FIFO size */
+ temp = lpuart32_read(sport->port.membase + UARTFIFO);
+
+ sport->txfifo_size = 0x1 << (((temp >> UARTFIFO_TXSIZE_OFF) &
+ UARTFIFO_FIFOSIZE_MASK) - 1);
+
+ sport->rxfifo_size = 0x1 << (((temp >> UARTFIFO_RXSIZE_OFF) &
+ UARTFIFO_FIFOSIZE_MASK) - 1);
+
+ ret = devm_request_irq(port->dev, port->irq, lpuart32_int, 0,
+ DRIVER_NAME, sport);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+
+ lpuart32_setup_watermark(sport);
+
+ temp = lpuart32_read(sport->port.membase + UARTCTRL);
+ temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE | UARTCTRL_TE);
+ temp |= UARTCTRL_ILIE;
+ lpuart32_write(temp, sport->port.membase + UARTCTRL);
+
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+ return 0;
+}
+
static void lpuart_shutdown(struct uart_port *port)
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
}
}
+static void lpuart32_shutdown(struct uart_port *port)
+{
+ struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+ unsigned long temp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+
+ /* disable Rx/Tx and interrupts */
+ temp = lpuart32_read(port->membase + UARTCTRL);
+ temp &= ~(UARTCTRL_TE | UARTCTRL_RE |
+ UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
+ lpuart32_write(temp, port->membase + UARTCTRL);
+
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ devm_free_irq(port->dev, port->irq, sport);
+}
+
static void
lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
spin_unlock_irqrestore(&sport->port.lock, flags);
}
+static void
+lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+ unsigned long flags;
+ unsigned long ctrl, old_ctrl, bd, modem;
+ unsigned int baud;
+ unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
+ unsigned int sbr;
+
+ ctrl = old_ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
+ bd = lpuart32_read(sport->port.membase + UARTBAUD);
+ modem = lpuart32_read(sport->port.membase + UARTMODIR);
+ /*
+ * only support CS8 and CS7, and for CS7 must enable PE.
+ * supported mode:
+ * - (7,e/o,1)
+ * - (8,n,1)
+ * - (8,m/s,1)
+ * - (8,e/o,1)
+ */
+ while ((termios->c_cflag & CSIZE) != CS8 &&
+ (termios->c_cflag & CSIZE) != CS7) {
+ termios->c_cflag &= ~CSIZE;
+ termios->c_cflag |= old_csize;
+ old_csize = CS8;
+ }
+
+ if ((termios->c_cflag & CSIZE) == CS8 ||
+ (termios->c_cflag & CSIZE) == CS7)
+ ctrl = old_ctrl & ~UARTCTRL_M;
+
+ if (termios->c_cflag & CMSPAR) {
+ if ((termios->c_cflag & CSIZE) != CS8) {
+ termios->c_cflag &= ~CSIZE;
+ termios->c_cflag |= CS8;
+ }
+ ctrl |= UARTCTRL_M;
+ }
+
+ if (termios->c_cflag & CRTSCTS) {
+ modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
+ } else {
+ termios->c_cflag &= ~CRTSCTS;
+ modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
+ }
+
+ if (termios->c_cflag & CSTOPB)
+ termios->c_cflag &= ~CSTOPB;
+
+ /* parity must be enabled when CS7 to match 8-bits format */
+ if ((termios->c_cflag & CSIZE) == CS7)
+ termios->c_cflag |= PARENB;
+
+ if ((termios->c_cflag & PARENB)) {
+ if (termios->c_cflag & CMSPAR) {
+ ctrl &= ~UARTCTRL_PE;
+ ctrl |= UARTCTRL_M;
+ } else {
+ ctrl |= UARTCR1_PE;
+ if ((termios->c_cflag & CSIZE) == CS8)
+ ctrl |= UARTCTRL_M;
+ if (termios->c_cflag & PARODD)
+ ctrl |= UARTCTRL_PT;
+ else
+ ctrl &= ~UARTCTRL_PT;
+ }
+ }
+
+ /* ask the core to calculate the divisor */
+ baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+
+ sport->port.read_status_mask = 0;
+ if (termios->c_iflag & INPCK)
+ sport->port.read_status_mask |= (UARTSTAT_FE | UARTSTAT_PE);
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
+ sport->port.read_status_mask |= UARTSTAT_FE;
+
+ /* characters to ignore */
+ sport->port.ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ sport->port.ignore_status_mask |= UARTSTAT_PE;
+ if (termios->c_iflag & IGNBRK) {
+ sport->port.ignore_status_mask |= UARTSTAT_FE;
+ /*
+ * if we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ sport->port.ignore_status_mask |= UARTSTAT_OR;
+ }
+
+ /* update the per-port timeout */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ /* wait transmit engin complete */
+ while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
+ barrier();
+
+ /* disable transmit and receive */
+ lpuart32_write(old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
+ sport->port.membase + UARTCTRL);
+
+ sbr = sport->port.uartclk / (16 * baud);
+ bd &= ~UARTBAUD_SBR_MASK;
+ bd |= sbr & UARTBAUD_SBR_MASK;
+ bd |= UARTBAUD_BOTHEDGE;
+ bd &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
+ lpuart32_write(bd, sport->port.membase + UARTBAUD);
+ lpuart32_write(modem, sport->port.membase + UARTMODIR);
+ lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
+ /* restore control register */
+
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
static const char *lpuart_type(struct uart_port *port)
{
return "FSL_LPUART";
.verify_port = lpuart_verify_port,
};
+static struct uart_ops lpuart32_pops = {
+ .tx_empty = lpuart32_tx_empty,
+ .set_mctrl = lpuart32_set_mctrl,
+ .get_mctrl = lpuart32_get_mctrl,
+ .stop_tx = lpuart32_stop_tx,
+ .start_tx = lpuart32_start_tx,
+ .stop_rx = lpuart32_stop_rx,
+ .break_ctl = lpuart32_break_ctl,
+ .startup = lpuart32_startup,
+ .shutdown = lpuart32_shutdown,
+ .set_termios = lpuart32_set_termios,
+ .type = lpuart_type,
+ .request_port = lpuart_request_port,
+ .release_port = lpuart_release_port,
+ .config_port = lpuart_config_port,
+ .verify_port = lpuart_verify_port,
+};
+
static struct lpuart_port *lpuart_ports[UART_NR];
#ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
writeb(ch, port->membase + UARTDR);
}
+static void lpuart32_console_putchar(struct uart_port *port, int ch)
+{
+ while (!(lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE))
+ barrier();
+
+ lpuart32_write(ch, port->membase + UARTDATA);
+}
+
static void
lpuart_console_write(struct console *co, const char *s, unsigned int count)
{
writeb(old_cr2, sport->port.membase + UARTCR2);
}
+static void
+lpuart32_console_write(struct console *co, const char *s, unsigned int count)
+{
+ struct lpuart_port *sport = lpuart_ports[co->index];
+ unsigned long old_cr, cr;
+
+ /* first save CR2 and then disable interrupts */
+ cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
+ cr |= (UARTCTRL_TE | UARTCTRL_RE);
+ cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
+ lpuart32_write(cr, sport->port.membase + UARTCTRL);
+
+ uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
+
+ /* wait for transmitter finish complete and restore CR2 */
+ while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
+ barrier();
+
+ lpuart32_write(old_cr, sport->port.membase + UARTCTRL);
+}
+
/*
* if the port was already initialised (eg, by a boot loader),
* try to determine the current setup.
"from %d to %d\n", baud_raw, *baud);
}
+static void __init
+lpuart32_console_get_options(struct lpuart_port *sport, int *baud,
+ int *parity, int *bits)
+{
+ unsigned long cr, bd;
+ unsigned int sbr, uartclk, baud_raw;
+
+ cr = lpuart32_read(sport->port.membase + UARTCTRL);
+ cr &= UARTCTRL_TE | UARTCTRL_RE;
+ if (!cr)
+ return;
+
+ /* ok, the port was enabled */
+
+ cr = lpuart32_read(sport->port.membase + UARTCTRL);
+
+ *parity = 'n';
+ if (cr & UARTCTRL_PE) {
+ if (cr & UARTCTRL_PT)
+ *parity = 'o';
+ else
+ *parity = 'e';
+ }
+
+ if (cr & UARTCTRL_M)
+ *bits = 9;
+ else
+ *bits = 8;
+
+ bd = lpuart32_read(sport->port.membase + UARTBAUD);
+ bd &= UARTBAUD_SBR_MASK;
+ sbr = bd;
+ uartclk = clk_get_rate(sport->clk);
+ /*
+ * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
+ */
+ baud_raw = uartclk / (16 * sbr);
+
+ if (*baud != baud_raw)
+ printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
+ "from %d to %d\n", baud_raw, *baud);
+}
+
static int __init lpuart_console_setup(struct console *co, char *options)
{
struct lpuart_port *sport;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
- lpuart_console_get_options(sport, &baud, &parity, &bits);
+ if (sport->lpuart32)
+ lpuart32_console_get_options(sport, &baud, &parity, &bits);
+ else
+ lpuart_console_get_options(sport, &baud, &parity, &bits);
- lpuart_setup_watermark(sport);
+ if (sport->lpuart32)
+ lpuart32_setup_watermark(sport);
+ else
+ lpuart_setup_watermark(sport);
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}
.data = &lpuart_reg,
};
+static struct console lpuart32_console = {
+ .name = DEV_NAME,
+ .write = lpuart32_console_write,
+ .device = uart_console_device,
+ .setup = lpuart_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &lpuart_reg,
+};
+
#define LPUART_CONSOLE (&lpuart_console)
+#define LPUART32_CONSOLE (&lpuart32_console)
#else
#define LPUART_CONSOLE NULL
+#define LPUART32_CONSOLE NULL
#endif
static struct uart_driver lpuart_reg = {
return ret;
}
sport->port.line = ret;
-
+ sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
sport->port.type = PORT_LPUART;
sport->port.iotype = UPIO_MEM;
sport->port.irq = platform_get_irq(pdev, 0);
- sport->port.ops = &lpuart_pops;
+ if (sport->lpuart32)
+ sport->port.ops = &lpuart32_pops;
+ else
+ sport->port.ops = &lpuart_pops;
sport->port.flags = UPF_BOOT_AUTOCONF;
sport->clk = devm_clk_get(&pdev->dev, "ipg");
platform_set_drvdata(pdev, &sport->port);
+ if (sport->lpuart32)
+ lpuart_reg.cons = LPUART32_CONSOLE;
+ else
+ lpuart_reg.cons = LPUART_CONSOLE;
+
ret = uart_add_one_port(&lpuart_reg, &sport->port);
if (ret) {
clk_disable_unprepare(sport->clk);
projects / firefly-linux-kernel-4.4.55.git / commitdiff