tty: serial: Add RDA8810PL UART driver

Add UART driver for RDA Micro RDA8810PL SoC.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Manivannan Sadhasivam 2018-12-18 20:32:37 +05:30 committed by Olof Johansson
parent 6fc66a5c68
commit c10b13325c
5 changed files with 860 additions and 0 deletions

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@ -1021,6 +1021,12 @@
specified address. The serial port must already be
setup and configured. Options are not yet supported.
rda,<addr>
Start an early, polled-mode console on a serial port
of an RDA Micro SoC, such as RDA8810PL, at the
specified address. The serial port must already be
setup and configured. Options are not yet supported.
smh Use ARM semihosting calls for early console.
s3c2410,<addr>

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@ -1529,6 +1529,25 @@ config SERIAL_OWL_CONSOLE
Say 'Y' here if you wish to use Actions Semiconductor S500/S900 UART
as the system console.
config SERIAL_RDA
bool "RDA Micro serial port support"
depends on ARCH_RDA || COMPILE_TEST
select SERIAL_CORE
help
This driver is for RDA8810PL SoC's UART.
Say 'Y' here if you wish to use the on-board serial port.
Otherwise, say 'N'.
config SERIAL_RDA_CONSOLE
bool "Console on RDA Micro serial port"
depends on SERIAL_RDA=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
default y
help
Say 'Y' here if you wish to use the RDA8810PL UART as the system
console. Only earlycon is implemented currently.
endmenu
config SERIAL_MCTRL_GPIO

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@ -89,6 +89,7 @@ obj-$(CONFIG_SERIAL_MVEBU_UART) += mvebu-uart.o
obj-$(CONFIG_SERIAL_PIC32) += pic32_uart.o
obj-$(CONFIG_SERIAL_MPS2_UART) += mps2-uart.o
obj-$(CONFIG_SERIAL_OWL) += owl-uart.o
obj-$(CONFIG_SERIAL_RDA) += rda-uart.o
# GPIOLIB helpers for modem control lines
obj-$(CONFIG_SERIAL_MCTRL_GPIO) += serial_mctrl_gpio.o

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@ -0,0 +1,831 @@
// 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");
/* Fall through */
case CS7:
ctrl &= ~RDA_UART_DBITS_8;
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) & (SERIAL_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);
}
spin_unlock(&port->lock);
tty_flip_buffer_push(&port->state->port);
spin_lock(&port->lock);
}
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_nocache(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, int 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) {
dev_err(&pdev->dev, "could not get irq\n");
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 __init 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");

View File

@ -281,4 +281,7 @@
/* MediaTek BTIF */
#define PORT_MTK_BTIF 117
/* RDA UART */
#define PORT_RDA 118
#endif /* _UAPILINUX_SERIAL_CORE_H */