OSCL-LXR linux-6.0.1/​drivers/​tty/​serial/​rda-uart.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * RDA8810PL serial device driver
  *
  * Copyright RDA Microelectronics Company Limited
  * Copyright (c) 2017 Andreas Färber
  * Copyright (c) 2018 Manivannan Sadhasivam
  */
 
 #include <linux/clk.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 
 #define RDA_UART_PORT_NUM 3
 #define RDA_UART_DEV_NAME "ttyRDA"
 
 #define RDA_UART_CTRL       0x00
 #define RDA_UART_STATUS     0x04
 #define RDA_UART_RXTX_BUFFER    0x08
 #define RDA_UART_IRQ_MASK   0x0c
 #define RDA_UART_IRQ_CAUSE  0x10
 #define RDA_UART_IRQ_TRIGGERS   0x14
 #define RDA_UART_CMD_SET    0x18
 #define RDA_UART_CMD_CLR    0x1c
 
 /* UART_CTRL Bits */
 #define RDA_UART_ENABLE         BIT(0)
 #define RDA_UART_DBITS_8        BIT(1)
 #define RDA_UART_TX_SBITS_2     BIT(2)
 #define RDA_UART_PARITY_EN      BIT(3)
 #define RDA_UART_PARITY(x)      (((x) & 0x3) << 4)
 #define RDA_UART_PARITY_ODD     RDA_UART_PARITY(0)
 #define RDA_UART_PARITY_EVEN        RDA_UART_PARITY(1)
 #define RDA_UART_PARITY_SPACE       RDA_UART_PARITY(2)
 #define RDA_UART_PARITY_MARK        RDA_UART_PARITY(3)
 #define RDA_UART_DIV_MODE       BIT(20)
 #define RDA_UART_IRDA_EN        BIT(21)
 #define RDA_UART_DMA_EN         BIT(22)
 #define RDA_UART_FLOW_CNT_EN        BIT(23)
 #define RDA_UART_LOOP_BACK_EN       BIT(24)
 #define RDA_UART_RX_LOCK_ERR        BIT(25)
 #define RDA_UART_RX_BREAK_LEN(x)    (((x) & 0xf) << 28)
 
 /* UART_STATUS Bits */
 #define RDA_UART_RX_FIFO(x)     (((x) & 0x7f) << 0)
 #define RDA_UART_RX_FIFO_MASK       (0x7f << 0)
 #define RDA_UART_TX_FIFO(x)     (((x) & 0x1f) << 8)
 #define RDA_UART_TX_FIFO_MASK       (0x1f << 8)
 #define RDA_UART_TX_ACTIVE      BIT(14)
 #define RDA_UART_RX_ACTIVE      BIT(15)
 #define RDA_UART_RX_OVERFLOW_ERR    BIT(16)
 #define RDA_UART_TX_OVERFLOW_ERR    BIT(17)
 #define RDA_UART_RX_PARITY_ERR      BIT(18)
 #define RDA_UART_RX_FRAMING_ERR     BIT(19)
 #define RDA_UART_RX_BREAK_INT       BIT(20)
 #define RDA_UART_DCTS           BIT(24)
 #define RDA_UART_CTS            BIT(25)
 #define RDA_UART_DTR            BIT(28)
 #define RDA_UART_CLK_ENABLED        BIT(31)
 
 /* UART_RXTX_BUFFER Bits */
 #define RDA_UART_RX_DATA(x)     (((x) & 0xff) << 0)
 #define RDA_UART_TX_DATA(x)     (((x) & 0xff) << 0)
 
 /* UART_IRQ_MASK Bits */
 #define RDA_UART_TX_MODEM_STATUS    BIT(0)
 #define RDA_UART_RX_DATA_AVAILABLE  BIT(1)
 #define RDA_UART_TX_DATA_NEEDED     BIT(2)
 #define RDA_UART_RX_TIMEOUT     BIT(3)
 #define RDA_UART_RX_LINE_ERR        BIT(4)
 #define RDA_UART_TX_DMA_DONE        BIT(5)
 #define RDA_UART_RX_DMA_DONE        BIT(6)
 #define RDA_UART_RX_DMA_TIMEOUT     BIT(7)
 #define RDA_UART_DTR_RISE       BIT(8)
 #define RDA_UART_DTR_FALL       BIT(9)
 
 /* UART_IRQ_CAUSE Bits */
 #define RDA_UART_TX_MODEM_STATUS_U  BIT(16)
 #define RDA_UART_RX_DATA_AVAILABLE_U    BIT(17)
 #define RDA_UART_TX_DATA_NEEDED_U   BIT(18)
 #define RDA_UART_RX_TIMEOUT_U       BIT(19)
 #define RDA_UART_RX_LINE_ERR_U      BIT(20)
 #define RDA_UART_TX_DMA_DONE_U      BIT(21)
 #define RDA_UART_RX_DMA_DONE_U      BIT(22)
 #define RDA_UART_RX_DMA_TIMEOUT_U   BIT(23)
 #define RDA_UART_DTR_RISE_U     BIT(24)
 #define RDA_UART_DTR_FALL_U     BIT(25)
 
 /* UART_TRIGGERS Bits */
 #define RDA_UART_RX_TRIGGER(x)      (((x) & 0x1f) << 0)
 #define RDA_UART_TX_TRIGGER(x)      (((x) & 0xf) << 8)
 #define RDA_UART_AFC_LEVEL(x)       (((x) & 0x1f) << 16)
 
 /* UART_CMD_SET Bits */
 #define RDA_UART_RI         BIT(0)
 #define RDA_UART_DCD            BIT(1)
 #define RDA_UART_DSR            BIT(2)
 #define RDA_UART_TX_BREAK_CONTROL   BIT(3)
 #define RDA_UART_TX_FINISH_N_WAIT   BIT(4)
 #define RDA_UART_RTS            BIT(5)
 #define RDA_UART_RX_FIFO_RESET      BIT(6)
 #define RDA_UART_TX_FIFO_RESET      BIT(7)
 
 #define RDA_UART_TX_FIFO_SIZE   16
 
 static struct uart_driver rda_uart_driver;
 
 struct rda_uart_port {
     struct uart_port port;
     struct clk *clk;
 };
 
 #define to_rda_uart_port(port) container_of(port, struct rda_uart_port, port)
 
 static struct rda_uart_port *rda_uart_ports[RDA_UART_PORT_NUM];
 
 static inline void rda_uart_write(struct uart_port *port, u32 val,
                   unsigned int off)
 {
     writel(val, port->membase + off);
 }
 
 static inline u32 rda_uart_read(struct uart_port *port, unsigned int off)
 {
     return readl(port->membase + off);
 }
 
 static unsigned int rda_uart_tx_empty(struct uart_port *port)
 {
     unsigned long flags;
     unsigned int ret;
     u32 val;
 
     spin_lock_irqsave(&port->lock, flags);
 
     val = rda_uart_read(port, RDA_UART_STATUS);
     ret = (val & RDA_UART_TX_FIFO_MASK) ? TIOCSER_TEMT : 0;
 
     spin_unlock_irqrestore(&port->lock, flags);
 
     return ret;
 }
 
 static unsigned int rda_uart_get_mctrl(struct uart_port *port)
 {
     unsigned int mctrl = 0;
     u32 cmd_set, status;
 
     cmd_set = rda_uart_read(port, RDA_UART_CMD_SET);
     status = rda_uart_read(port, RDA_UART_STATUS);
     if (cmd_set & RDA_UART_RTS)
         mctrl |= TIOCM_RTS;
     if (!(status & RDA_UART_CTS))
         mctrl |= TIOCM_CTS;
 
     return mctrl;
 }
 
 static void rda_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
     u32 val;
 
     if (mctrl & TIOCM_RTS) {
         val = rda_uart_read(port, RDA_UART_CMD_SET);
         rda_uart_write(port, (val | RDA_UART_RTS), RDA_UART_CMD_SET);
     } else {
         /* Clear RTS to stop to receive. */
         val = rda_uart_read(port, RDA_UART_CMD_CLR);
         rda_uart_write(port, (val | RDA_UART_RTS), RDA_UART_CMD_CLR);
     }
 
     val = rda_uart_read(port, RDA_UART_CTRL);
 
     if (mctrl & TIOCM_LOOP)
         val |= RDA_UART_LOOP_BACK_EN;
     else
         val &= ~RDA_UART_LOOP_BACK_EN;
 
     rda_uart_write(port, val, RDA_UART_CTRL);
 }
 
 static void rda_uart_stop_tx(struct uart_port *port)
 {
     u32 val;
 
     val = rda_uart_read(port, RDA_UART_IRQ_MASK);
     val &= ~RDA_UART_TX_DATA_NEEDED;
     rda_uart_write(port, val, RDA_UART_IRQ_MASK);
 
     val = rda_uart_read(port, RDA_UART_CMD_SET);
     val |= RDA_UART_TX_FIFO_RESET;
     rda_uart_write(port, val, RDA_UART_CMD_SET);
 }
 
 static void rda_uart_stop_rx(struct uart_port *port)
 {
     u32 val;
 
     val = rda_uart_read(port, RDA_UART_IRQ_MASK);
     val &= ~(RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT);
     rda_uart_write(port, val, RDA_UART_IRQ_MASK);
 
     /* Read Rx buffer before reset to avoid Rx timeout interrupt */
     val = rda_uart_read(port, RDA_UART_RXTX_BUFFER);
 
     val = rda_uart_read(port, RDA_UART_CMD_SET);
     val |= RDA_UART_RX_FIFO_RESET;
     rda_uart_write(port, val, RDA_UART_CMD_SET);
 }
 
 static void rda_uart_start_tx(struct uart_port *port)
 {
     u32 val;
 
     if (uart_tx_stopped(port)) {
         rda_uart_stop_tx(port);
         return;
     }
 
     val = rda_uart_read(port, RDA_UART_IRQ_MASK);
     val |= RDA_UART_TX_DATA_NEEDED;
     rda_uart_write(port, val, RDA_UART_IRQ_MASK);
 }
 
 static void rda_uart_change_baudrate(struct rda_uart_port *rda_port,
                      unsigned long baud)
 {
     clk_set_rate(rda_port->clk, baud * 8);
 }
 
 static void rda_uart_set_termios(struct uart_port *port,
                  struct ktermios *termios,
                  struct ktermios *old)
 {
     struct rda_uart_port *rda_port = to_rda_uart_port(port);
     unsigned long flags;
     unsigned int ctrl, cmd_set, cmd_clr, triggers;
     unsigned int baud;
     u32 irq_mask;
 
     spin_lock_irqsave(&port->lock, flags);
 
     baud = uart_get_baud_rate(port, termios, old, 9600, port->uartclk / 4);
     rda_uart_change_baudrate(rda_port, baud);
 
     ctrl = rda_uart_read(port, RDA_UART_CTRL);
     cmd_set = rda_uart_read(port, RDA_UART_CMD_SET);
     cmd_clr = rda_uart_read(port, RDA_UART_CMD_CLR);
 
     switch (termios->c_cflag & CSIZE) {
     case CS5:
     case CS6:
         dev_warn(port->dev, "bit size not supported, using 7 bits\n");
         fallthrough;
     case CS7:
         ctrl &= ~RDA_UART_DBITS_8;
         termios->c_cflag &= ~CSIZE;
         termios->c_cflag |= CS7;
         break;
     default:
         ctrl |= RDA_UART_DBITS_8;
         break;
     }
 
     /* stop bits */
     if (termios->c_cflag & CSTOPB)
         ctrl |= RDA_UART_TX_SBITS_2;
     else
         ctrl &= ~RDA_UART_TX_SBITS_2;
 
     /* parity check */
     if (termios->c_cflag & PARENB) {
         ctrl |= RDA_UART_PARITY_EN;
 
         /* Mark or Space parity */
         if (termios->c_cflag & CMSPAR) {
             if (termios->c_cflag & PARODD)
                 ctrl |= RDA_UART_PARITY_MARK;
             else
                 ctrl |= RDA_UART_PARITY_SPACE;
         } else if (termios->c_cflag & PARODD) {
             ctrl |= RDA_UART_PARITY_ODD;
         } else {
             ctrl |= RDA_UART_PARITY_EVEN;
         }
     } else {
         ctrl &= ~RDA_UART_PARITY_EN;
     }
 
     /* Hardware handshake (RTS/CTS) */
     if (termios->c_cflag & CRTSCTS) {
         ctrl   |= RDA_UART_FLOW_CNT_EN;
         cmd_set |= RDA_UART_RTS;
     } else {
         ctrl   &= ~RDA_UART_FLOW_CNT_EN;
         cmd_clr |= RDA_UART_RTS;
     }
 
     ctrl |= RDA_UART_ENABLE;
     ctrl &= ~RDA_UART_DMA_EN;
 
     triggers  = (RDA_UART_AFC_LEVEL(20) | RDA_UART_RX_TRIGGER(16));
     irq_mask = rda_uart_read(port, RDA_UART_IRQ_MASK);
     rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
 
     rda_uart_write(port, triggers, RDA_UART_IRQ_TRIGGERS);
     rda_uart_write(port, ctrl, RDA_UART_CTRL);
     rda_uart_write(port, cmd_set, RDA_UART_CMD_SET);
     rda_uart_write(port, cmd_clr, RDA_UART_CMD_CLR);
 
     rda_uart_write(port, irq_mask, RDA_UART_IRQ_MASK);
 
     /* Don't rewrite B0 */
     if (tty_termios_baud_rate(termios))
         tty_termios_encode_baud_rate(termios, baud, baud);
 
     /* update the per-port timeout */
     uart_update_timeout(port, termios->c_cflag, baud);
 
     spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void rda_uart_send_chars(struct uart_port *port)
 {
     struct circ_buf *xmit = &port->state->xmit;
     unsigned int ch;
     u32 val;
 
     if (uart_tx_stopped(port))
         return;
 
     if (port->x_char) {
         while (!(rda_uart_read(port, RDA_UART_STATUS) &
              RDA_UART_TX_FIFO_MASK))
             cpu_relax();
 
         rda_uart_write(port, port->x_char, RDA_UART_RXTX_BUFFER);
         port->icount.tx++;
         port->x_char = 0;
     }
 
     while (rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK) {
         if (uart_circ_empty(xmit))
             break;
 
         ch = xmit->buf[xmit->tail];
         rda_uart_write(port, ch, RDA_UART_RXTX_BUFFER);
         xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
         port->icount.tx++;
     }
 
     if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
         uart_write_wakeup(port);
 
     if (!uart_circ_empty(xmit)) {
         /* Re-enable Tx FIFO interrupt */
         val = rda_uart_read(port, RDA_UART_IRQ_MASK);
         val |= RDA_UART_TX_DATA_NEEDED;
         rda_uart_write(port, val, RDA_UART_IRQ_MASK);
     }
 }
 
 static void rda_uart_receive_chars(struct uart_port *port)
 {
     u32 status, val;
 
     status = rda_uart_read(port, RDA_UART_STATUS);
     while ((status & RDA_UART_RX_FIFO_MASK)) {
         char flag = TTY_NORMAL;
 
         if (status & RDA_UART_RX_PARITY_ERR) {
             port->icount.parity++;
             flag = TTY_PARITY;
         }
 
         if (status & RDA_UART_RX_FRAMING_ERR) {
             port->icount.frame++;
             flag = TTY_FRAME;
         }
 
         if (status & RDA_UART_RX_OVERFLOW_ERR) {
             port->icount.overrun++;
             flag = TTY_OVERRUN;
         }
 
         val = rda_uart_read(port, RDA_UART_RXTX_BUFFER);
         val &= 0xff;
 
         port->icount.rx++;
         tty_insert_flip_char(&port->state->port, val, flag);
 
         status = rda_uart_read(port, RDA_UART_STATUS);
     }
 
     tty_flip_buffer_push(&port->state->port);
 }
 
 static irqreturn_t rda_interrupt(int irq, void *dev_id)
 {
     struct uart_port *port = dev_id;
     unsigned long flags;
     u32 val, irq_mask;
 
     spin_lock_irqsave(&port->lock, flags);
 
     /* Clear IRQ cause */
     val = rda_uart_read(port, RDA_UART_IRQ_CAUSE);
     rda_uart_write(port, val, RDA_UART_IRQ_CAUSE);
 
     if (val & (RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT))
         rda_uart_receive_chars(port);
 
     if (val & (RDA_UART_TX_DATA_NEEDED)) {
         irq_mask = rda_uart_read(port, RDA_UART_IRQ_MASK);
         irq_mask &= ~RDA_UART_TX_DATA_NEEDED;
         rda_uart_write(port, irq_mask, RDA_UART_IRQ_MASK);
 
         rda_uart_send_chars(port);
     }
 
     spin_unlock_irqrestore(&port->lock, flags);
 
     return IRQ_HANDLED;
 }
 
 static int rda_uart_startup(struct uart_port *port)
 {
     unsigned long flags;
     int ret;
     u32 val;
 
     spin_lock_irqsave(&port->lock, flags);
     rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
     spin_unlock_irqrestore(&port->lock, flags);
 
     ret = request_irq(port->irq, rda_interrupt, IRQF_NO_SUSPEND,
               "rda-uart", port);
     if (ret)
         return ret;
 
     spin_lock_irqsave(&port->lock, flags);
 
     val = rda_uart_read(port, RDA_UART_CTRL);
     val |= RDA_UART_ENABLE;
     rda_uart_write(port, val, RDA_UART_CTRL);
 
     /* enable rx interrupt */
     val = rda_uart_read(port, RDA_UART_IRQ_MASK);
     val |= (RDA_UART_RX_DATA_AVAILABLE | RDA_UART_RX_TIMEOUT);
     rda_uart_write(port, val, RDA_UART_IRQ_MASK);
 
     spin_unlock_irqrestore(&port->lock, flags);
 
     return 0;
 }
 
 static void rda_uart_shutdown(struct uart_port *port)
 {
     unsigned long flags;
     u32 val;
 
     spin_lock_irqsave(&port->lock, flags);
 
     rda_uart_stop_tx(port);
     rda_uart_stop_rx(port);
 
     val = rda_uart_read(port, RDA_UART_CTRL);
     val &= ~RDA_UART_ENABLE;
     rda_uart_write(port, val, RDA_UART_CTRL);
 
     spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static const char *rda_uart_type(struct uart_port *port)
 {
     return (port->type == PORT_RDA) ? "rda-uart" : NULL;
 }
 
 static int rda_uart_request_port(struct uart_port *port)
 {
     struct platform_device *pdev = to_platform_device(port->dev);
     struct resource *res;
 
     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     if (!res)
         return -ENXIO;
 
     if (!devm_request_mem_region(port->dev, port->mapbase,
                      resource_size(res), dev_name(port->dev)))
         return -EBUSY;
 
     if (port->flags & UPF_IOREMAP) {
         port->membase = devm_ioremap(port->dev, port->mapbase,
                              resource_size(res));
         if (!port->membase)
             return -EBUSY;
     }
 
     return 0;
 }
 
 static void rda_uart_config_port(struct uart_port *port, int flags)
 {
     unsigned long irq_flags;
 
     if (flags & UART_CONFIG_TYPE) {
         port->type = PORT_RDA;
         rda_uart_request_port(port);
     }
 
     spin_lock_irqsave(&port->lock, irq_flags);
 
     /* Clear mask, so no surprise interrupts. */
     rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
 
     /* Clear status register */
     rda_uart_write(port, 0, RDA_UART_STATUS);
 
     spin_unlock_irqrestore(&port->lock, irq_flags);
 }
 
 static void rda_uart_release_port(struct uart_port *port)
 {
     struct platform_device *pdev = to_platform_device(port->dev);
     struct resource *res;
 
     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     if (!res)
         return;
 
     if (port->flags & UPF_IOREMAP) {
         devm_release_mem_region(port->dev, port->mapbase,
                     resource_size(res));
         devm_iounmap(port->dev, port->membase);
         port->membase = NULL;
     }
 }
 
 static int rda_uart_verify_port(struct uart_port *port,
                 struct serial_struct *ser)
 {
     if (port->type != PORT_RDA)
         return -EINVAL;
 
     if (port->irq != ser->irq)
         return -EINVAL;
 
     return 0;
 }
 
 static const struct uart_ops rda_uart_ops = {
     .tx_empty       = rda_uart_tx_empty,
     .get_mctrl      = rda_uart_get_mctrl,
     .set_mctrl      = rda_uart_set_mctrl,
     .start_tx       = rda_uart_start_tx,
     .stop_tx        = rda_uart_stop_tx,
     .stop_rx        = rda_uart_stop_rx,
     .startup        = rda_uart_startup,
     .shutdown       = rda_uart_shutdown,
     .set_termios    = rda_uart_set_termios,
     .type           = rda_uart_type,
     .request_port   = rda_uart_request_port,
     .release_port   = rda_uart_release_port,
     .config_port    = rda_uart_config_port,
     .verify_port    = rda_uart_verify_port,
 };
 
 #ifdef CONFIG_SERIAL_RDA_CONSOLE
 
 static void rda_console_putchar(struct uart_port *port, unsigned char ch)
 {
     if (!port->membase)
         return;
 
     while (!(rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK))
         cpu_relax();
 
     rda_uart_write(port, ch, RDA_UART_RXTX_BUFFER);
 }
 
 static void rda_uart_port_write(struct uart_port *port, const char *s,
                 u_int count)
 {
     u32 old_irq_mask;
     unsigned long flags;
     int locked;
 
     local_irq_save(flags);
 
     if (port->sysrq) {
         locked = 0;
     } else if (oops_in_progress) {
         locked = spin_trylock(&port->lock);
     } else {
         spin_lock(&port->lock);
         locked = 1;
     }
 
     old_irq_mask = rda_uart_read(port, RDA_UART_IRQ_MASK);
     rda_uart_write(port, 0, RDA_UART_IRQ_MASK);
 
     uart_console_write(port, s, count, rda_console_putchar);
 
     /* wait until all contents have been sent out */
     while (!(rda_uart_read(port, RDA_UART_STATUS) & RDA_UART_TX_FIFO_MASK))
         cpu_relax();
 
     rda_uart_write(port, old_irq_mask, RDA_UART_IRQ_MASK);
 
     if (locked)
         spin_unlock(&port->lock);
 
     local_irq_restore(flags);
 }
 
 static void rda_uart_console_write(struct console *co, const char *s,
                    u_int count)
 {
     struct rda_uart_port *rda_port;
 
     rda_port = rda_uart_ports[co->index];
     if (!rda_port)
         return;
 
     rda_uart_port_write(&rda_port->port, s, count);
 }
 
 static int rda_uart_console_setup(struct console *co, char *options)
 {
     struct rda_uart_port *rda_port;
     int baud = 921600;
     int bits = 8;
     int parity = 'n';
     int flow = 'n';
 
     if (co->index < 0 || co->index >= RDA_UART_PORT_NUM)
         return -EINVAL;
 
     rda_port = rda_uart_ports[co->index];
     if (!rda_port || !rda_port->port.membase)
         return -ENODEV;
 
     if (options)
         uart_parse_options(options, &baud, &parity, &bits, &flow);
 
     return uart_set_options(&rda_port->port, co, baud, parity, bits, flow);
 }
 
 static struct console rda_uart_console = {
     .name = RDA_UART_DEV_NAME,
     .write = rda_uart_console_write,
     .device = uart_console_device,
     .setup = rda_uart_console_setup,
     .flags = CON_PRINTBUFFER,
     .index = -1,
     .data = &rda_uart_driver,
 };
 
 static int __init rda_uart_console_init(void)
 {
     register_console(&rda_uart_console);
 
     return 0;
 }
 console_initcall(rda_uart_console_init);
 
 static void rda_uart_early_console_write(struct console *co,
                      const char *s,
                      u_int count)
 {
     struct earlycon_device *dev = co->data;
 
     rda_uart_port_write(&dev->port, s, count);
 }
 
 static int __init
 rda_uart_early_console_setup(struct earlycon_device *device, const char *opt)
 {
     if (!device->port.membase)
         return -ENODEV;
 
     device->con->write = rda_uart_early_console_write;
 
     return 0;
 }
 
 OF_EARLYCON_DECLARE(rda, "rda,8810pl-uart",
             rda_uart_early_console_setup);
 
 #define RDA_UART_CONSOLE (&rda_uart_console)
 #else
 #define RDA_UART_CONSOLE NULL
 #endif /* CONFIG_SERIAL_RDA_CONSOLE */
 
 static struct uart_driver rda_uart_driver = {
     .owner = THIS_MODULE,
     .driver_name = "rda-uart",
     .dev_name = RDA_UART_DEV_NAME,
     .nr = RDA_UART_PORT_NUM,
     .cons = RDA_UART_CONSOLE,
 };
 
 static const struct of_device_id rda_uart_dt_matches[] = {
     { .compatible = "rda,8810pl-uart" },
     { }
 };
 MODULE_DEVICE_TABLE(of, rda_uart_dt_matches);
 
 static int rda_uart_probe(struct platform_device *pdev)
 {
     struct resource *res_mem;
     struct rda_uart_port *rda_port;
     int ret, irq;
 
     if (pdev->dev.of_node)
         pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
 
     if (pdev->id < 0 || pdev->id >= RDA_UART_PORT_NUM) {
         dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
         return -EINVAL;
     }
 
     res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
     if (!res_mem) {
         dev_err(&pdev->dev, "could not get mem\n");
         return -ENODEV;
     }
 
     irq = platform_get_irq(pdev, 0);
     if (irq < 0)
         return irq;
 
     if (rda_uart_ports[pdev->id]) {
         dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
         return -EBUSY;
     }
 
     rda_port = devm_kzalloc(&pdev->dev, sizeof(*rda_port), GFP_KERNEL);
     if (!rda_port)
         return -ENOMEM;
 
     rda_port->clk = devm_clk_get(&pdev->dev, NULL);
     if (IS_ERR(rda_port->clk)) {
         dev_err(&pdev->dev, "could not get clk\n");
         return PTR_ERR(rda_port->clk);
     }
 
     rda_port->port.dev = &pdev->dev;
     rda_port->port.regshift = 0;
     rda_port->port.line = pdev->id;
     rda_port->port.type = PORT_RDA;
     rda_port->port.iotype = UPIO_MEM;
     rda_port->port.mapbase = res_mem->start;
     rda_port->port.irq = irq;
     rda_port->port.uartclk = clk_get_rate(rda_port->clk);
     if (rda_port->port.uartclk == 0) {
         dev_err(&pdev->dev, "clock rate is zero\n");
         return -EINVAL;
     }
     rda_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP |
                    UPF_LOW_LATENCY;
     rda_port->port.x_char = 0;
     rda_port->port.fifosize = RDA_UART_TX_FIFO_SIZE;
     rda_port->port.ops = &rda_uart_ops;
 
     rda_uart_ports[pdev->id] = rda_port;
     platform_set_drvdata(pdev, rda_port);
 
     ret = uart_add_one_port(&rda_uart_driver, &rda_port->port);
     if (ret)
         rda_uart_ports[pdev->id] = NULL;
 
     return ret;
 }
 
 static int rda_uart_remove(struct platform_device *pdev)
 {
     struct rda_uart_port *rda_port = platform_get_drvdata(pdev);
 
     uart_remove_one_port(&rda_uart_driver, &rda_port->port);
     rda_uart_ports[pdev->id] = NULL;
 
     return 0;
 }
 
 static struct platform_driver rda_uart_platform_driver = {
     .probe = rda_uart_probe,
     .remove = rda_uart_remove,
     .driver = {
         .name = "rda-uart",
         .of_match_table = rda_uart_dt_matches,
     },
 };
 
 static int __init rda_uart_init(void)
 {
     int ret;
 
     ret = uart_register_driver(&rda_uart_driver);
     if (ret)
         return ret;
 
     ret = platform_driver_register(&rda_uart_platform_driver);
     if (ret)
         uart_unregister_driver(&rda_uart_driver);
 
     return ret;
 }
 
 static void __exit rda_uart_exit(void)
 {
     platform_driver_unregister(&rda_uart_platform_driver);
     uart_unregister_driver(&rda_uart_driver);
 }
 
 module_init(rda_uart_init);
 module_exit(rda_uart_exit);
 
 MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
 MODULE_DESCRIPTION("RDA8810PL serial device driver");
 MODULE_LICENSE("GPL");

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