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Message-ID: <87povajs1l.fsf@free-electrons.com>
Date: Fri, 04 Mar 2016 14:23:18 +0100
From: Gregory CLEMENT <gregory.clement@...e-electrons.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...e.com>
Cc: Andrew Lunn <andrew@...n.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
Jason Cooper <jason@...edaemon.net>,
linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
linux-arm-kernel@...ts.infradead.org,
Lior Amsalem <alior@...vell.com>,
Nadav Haklai <nadavh@...vell.com>,
Omri Itach <omrii@...vell.com>
Subject: Re: [PATCH v4 05/12] arm64: add mvebu architecture entry
Hi Greg and Jiri,
this is a gentle ping about this patch.
On jeu., févr. 18 2016, Gregory CLEMENT <gregory.clement@...e-electrons.com> wrote:
> Hi Greg and Jiri
>
> On mar., févr. 16 2016, Gregory CLEMENT <gregory.clement@...e-electrons.com> wrote:
>
>> From: Wilson Ding <dingwei@...vell.com>
>>
>> Armada-3700's uart is a simple serial port, which doesn't
>> support. Configuring the modem control lines. The uart port has a 32
>> bytes Tx FIFO and a 64 bytes Rx FIFO
>>
>> The uart driver implements the uart core operations. It also support the
>> system (early) console based on Armada-3700's serial port.
>>
>> Known Issue:
>>
>> The uart driver currently doesn't support clock programming, which means
>> the baud-rate stays with the default value configured by the bootloader
>> at boot time
>>
>> [gregory.clement@...e-electrons.com: Rewrite many part which are too long
>> to enumerate]
>>
>> Signed-off-by: Wilson Ding <dingwei@...vell.com>
>> Signed-off-by: Nadav Haklai <nadavh@...vell.com>
>> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
>> Acked-by: Rob Herring <robh@...nel.org>
>
> I took care of the arm related part of the series, but I will let you
> apply this patch in the serial subsystem once you have reviewed it. But
> if for any reason you preferred that I took it through mvebu just tell
> me.
>
Finally all the other part of the series have all been pulled in their
respective subsystem. The device tree binding for this driver have been
acked by the device tree maintainer. And this patch is the last
remaining piece for having a initial support for the Armada 3700
platform.
So I wondered what was the status of this patch? Do you plan to apply it
or do you have some other comments ?
Thanks,
Gregory
>
>> ---
>> .../devicetree/bindings/tty/serial/mvebu-uart.txt | 13 +
>> Documentation/kernel-parameters.txt | 6 +
>> drivers/tty/serial/Kconfig | 22 +
>> drivers/tty/serial/Makefile | 1 +
>> drivers/tty/serial/mvebu-uart.c | 650 +++++++++++++++++++++
>> include/uapi/linux/serial_core.h | 3 +
>> 6 files changed, 695 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt
>> create mode 100644 drivers/tty/serial/mvebu-uart.c
>>
>> diff --git a/Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt b/Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt
>> new file mode 100644
>> index 000000000000..6087defd9f93
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/tty/serial/mvebu-uart.txt
>> @@ -0,0 +1,13 @@
>> +* Marvell UART : Non standard UART used in some of Marvell EBU SoCs (e.g., Armada-3700)
>> +
>> +Required properties:
>> +- compatible: "marvell,armada-3700-uart"
>> +- reg: offset and length of the register set for the device.
>> +- interrupts: device interrupt
>> +
>> +Example:
>> + serial@...00 {
>> + compatible = "marvell,armada-3700-uart";
>> + reg = <0x12000 0x400>;
>> + interrupts = <43>;
>> + };
>> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
>> index 87d40a72f6a1..ea0aba48d616 100644
>> --- a/Documentation/kernel-parameters.txt
>> +++ b/Documentation/kernel-parameters.txt
>> @@ -1058,6 +1058,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>> A valid base address must be provided, and the serial
>> port must already be setup and configured.
>>
>> + armada3700_uart,<addr>
>> + Start an early, polled-mode console on the
>> + Armada 3700 serial port at the specified
>> + address. The serial port must already be setup
>> + and configured. Options are not yet supported.
>> +
>> earlyprintk= [X86,SH,BLACKFIN,ARM,M68k]
>> earlyprintk=vga
>> earlyprintk=efi
>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>> index 39721ec4f415..b291f934d51b 100644
>> --- a/drivers/tty/serial/Kconfig
>> +++ b/drivers/tty/serial/Kconfig
>> @@ -1606,6 +1606,28 @@ config SERIAL_STM32_CONSOLE
>> depends on SERIAL_STM32=y
>> select SERIAL_CORE_CONSOLE
>>
>> +config SERIAL_MVEBU_UART
>> + bool "Marvell EBU serial port support"
>> + select SERIAL_CORE
>> + help
>> + This driver is for Marvell EBU SoC's UART. If you have a machine
>> + based on the Armada-3700 SoC and wish to use the on-board serial
>> + port,
>> + say 'Y' here.
>> + Otherwise, say 'N'.
>> +
>> +config SERIAL_MVEBU_CONSOLE
>> + bool "Console on Marvell EBU serial port"
>> + depends on SERIAL_MVEBU_UART
>> + select SERIAL_CORE_CONSOLE
>> + select SERIAL_EARLYCON
>> + default y
>> + help
>> + Say 'Y' here if you wish to use Armada-3700 UART as the system console.
>> + (the system console is the device which receives all kernel messages
>> + and warnings and which allows logins in single user mode)
>> + Otherwise, say 'N'.
>> +
>> endmenu
>>
>> config SERIAL_MCTRL_GPIO
>> diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
>> index b391c9b31960..988167595330 100644
>> --- a/drivers/tty/serial/Makefile
>> +++ b/drivers/tty/serial/Makefile
>> @@ -91,6 +91,7 @@ obj-$(CONFIG_SERIAL_CONEXANT_DIGICOLOR) += digicolor-usart.o
>> obj-$(CONFIG_SERIAL_MEN_Z135) += men_z135_uart.o
>> obj-$(CONFIG_SERIAL_SPRD) += sprd_serial.o
>> obj-$(CONFIG_SERIAL_STM32) += stm32-usart.o
>> +obj-$(CONFIG_SERIAL_MVEBU_UART) += mvebu-uart.o
>>
>> # GPIOLIB helpers for modem control lines
>> obj-$(CONFIG_SERIAL_MCTRL_GPIO) += serial_mctrl_gpio.o
>> diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
>> new file mode 100644
>> index 000000000000..0ff27818bb87
>> --- /dev/null
>> +++ b/drivers/tty/serial/mvebu-uart.c
>> @@ -0,0 +1,650 @@
>> +/*
>> +* ***************************************************************************
>> +* Copyright (C) 2015 Marvell International Ltd.
>> +* ***************************************************************************
>> +* 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 the Free
>> +* Software Foundation, either version 2 of the License, or any later version.
>> +*
>> +* This program is distributed in the hope that it will be useful,
>> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
>> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> +* GNU General Public License for more details.
>> +*
>> +* You should have received a copy of the GNU General Public License
>> +* along with this program. If not, see <http://www.gnu.org/licenses/>.
>> +* ***************************************************************************
>> +*/
>> +
>> +#include <linux/clk.h>
>> +#include <linux/console.h>
>> +#include <linux/delay.h>
>> +#include <linux/device.h>
>> +#include <linux/init.h>
>> +#include <linux/io.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/serial.h>
>> +#include <linux/serial_core.h>
>> +#include <linux/slab.h>
>> +#include <linux/tty.h>
>> +#include <linux/tty_flip.h>
>> +
>> +/* Register Map */
>> +#define UART_RBR 0x00
>> +#define RBR_BRK_DET BIT(15)
>> +#define RBR_FRM_ERR_DET BIT(14)
>> +#define RBR_PAR_ERR_DET BIT(13)
>> +#define RBR_OVR_ERR_DET BIT(12)
>> +
>> +#define UART_TSH 0x04
>> +
>> +#define UART_CTRL 0x08
>> +#define CTRL_SOFT_RST BIT(31)
>> +#define CTRL_TXFIFO_RST BIT(15)
>> +#define CTRL_RXFIFO_RST BIT(14)
>> +#define CTRL_ST_MIRR_EN BIT(13)
>> +#define CTRL_LPBK_EN BIT(12)
>> +#define CTRL_SND_BRK_SEQ BIT(11)
>> +#define CTRL_PAR_EN BIT(10)
>> +#define CTRL_TWO_STOP BIT(9)
>> +#define CTRL_TX_HFL_INT BIT(8)
>> +#define CTRL_RX_HFL_INT BIT(7)
>> +#define CTRL_TX_EMP_INT BIT(6)
>> +#define CTRL_TX_RDY_INT BIT(5)
>> +#define CTRL_RX_RDY_INT BIT(4)
>> +#define CTRL_BRK_DET_INT BIT(3)
>> +#define CTRL_FRM_ERR_INT BIT(2)
>> +#define CTRL_PAR_ERR_INT BIT(1)
>> +#define CTRL_OVR_ERR_INT BIT(0)
>> +#define CTRL_RX_INT (CTRL_RX_RDY_INT | CTRL_BRK_DET_INT |\
>> + CTRL_FRM_ERR_INT | CTRL_PAR_ERR_INT | CTRL_OVR_ERR_INT)
>> +
>> +#define UART_STAT 0x0c
>> +#define STAT_TX_FIFO_EMP BIT(13)
>> +#define STAT_RX_FIFO_EMP BIT(12)
>> +#define STAT_TX_FIFO_FUL BIT(11)
>> +#define STAT_TX_FIFO_HFL BIT(10)
>> +#define STAT_RX_TOGL BIT(9)
>> +#define STAT_RX_FIFO_FUL BIT(8)
>> +#define STAT_RX_FIFO_HFL BIT(7)
>> +#define STAT_TX_EMP BIT(6)
>> +#define STAT_TX_RDY BIT(5)
>> +#define STAT_RX_RDY BIT(4)
>> +#define STAT_BRK_DET BIT(3)
>> +#define STAT_FRM_ERR BIT(2)
>> +#define STAT_PAR_ERR BIT(1)
>> +#define STAT_OVR_ERR BIT(0)
>> +#define STAT_BRK_ERR (STAT_BRK_DET | STAT_FRM_ERR | STAT_FRM_ERR\
>> + | STAT_PAR_ERR | STAT_OVR_ERR)
>> +
>> +#define UART_BRDV 0x10
>> +
>> +#define MVEBU_NR_UARTS 1
>> +
>> +#define MVEBU_UART_TYPE "mvebu-uart"
>> +
>> +static struct uart_port mvebu_uart_ports[MVEBU_NR_UARTS];
>> +
>> +struct mvebu_uart_data {
>> + struct uart_port *port;
>> + struct clk *clk;
>> +};
>> +
>> +/* Core UART Driver Operations */
>> +static unsigned int mvebu_uart_tx_empty(struct uart_port *port)
>> +{
>> + unsigned long flags;
>> + unsigned int st;
>> +
>> + spin_lock_irqsave(&port->lock, flags);
>> + st = readl(port->membase + UART_STAT);
>> + spin_unlock_irqrestore(&port->lock, flags);
>> +
>> + return (st & STAT_TX_FIFO_EMP) ? TIOCSER_TEMT : 0;
>> +}
>> +
>> +static unsigned int mvebu_uart_get_mctrl(struct uart_port *port)
>> +{
>> + return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
>> +}
>> +
>> +static void mvebu_uart_set_mctrl(struct uart_port *port,
>> + unsigned int mctrl)
>> +{
>> +/*
>> + * Even if we do not support configuring the modem control lines, this
>> + * function must be proided to the serial core
>> + */
>> +}
>> +
>> +static void mvebu_uart_stop_tx(struct uart_port *port)
>> +{
>> + unsigned int ctl = readl(port->membase + UART_CTRL);
>> +
>> + ctl &= ~CTRL_TX_RDY_INT;
>> + writel(ctl, port->membase + UART_CTRL);
>> +}
>> +
>> +static void mvebu_uart_start_tx(struct uart_port *port)
>> +{
>> + unsigned int ctl = readl(port->membase + UART_CTRL);
>> +
>> + ctl |= CTRL_TX_RDY_INT;
>> + writel(ctl, port->membase + UART_CTRL);
>> +}
>> +
>> +static void mvebu_uart_stop_rx(struct uart_port *port)
>> +{
>> + unsigned int ctl = readl(port->membase + UART_CTRL);
>> +
>> + ctl &= ~CTRL_RX_INT;
>> + writel(ctl, port->membase + UART_CTRL);
>> +}
>> +
>> +static void mvebu_uart_break_ctl(struct uart_port *port, int brk)
>> +{
>> + unsigned int ctl;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&port->lock, flags);
>> + ctl = readl(port->membase + UART_CTRL);
>> + if (brk == -1)
>> + ctl |= CTRL_SND_BRK_SEQ;
>> + else
>> + ctl &= ~CTRL_SND_BRK_SEQ;
>> + writel(ctl, port->membase + UART_CTRL);
>> + spin_unlock_irqrestore(&port->lock, flags);
>> +}
>> +
>> +static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status)
>> +{
>> + struct tty_port *tport = &port->state->port;
>> + unsigned char ch = 0;
>> + char flag = 0;
>> +
>> + do {
>> + if (status & STAT_RX_RDY) {
>> + ch = readl(port->membase + UART_RBR);
>> + ch &= 0xff;
>> + flag = TTY_NORMAL;
>> + port->icount.rx++;
>> +
>> + if (status & STAT_PAR_ERR)
>> + port->icount.parity++;
>> + }
>> +
>> + if (status & STAT_BRK_DET) {
>> + port->icount.brk++;
>> + status &= ~(STAT_FRM_ERR | STAT_PAR_ERR);
>> + if (uart_handle_break(port))
>> + goto ignore_char;
>> + }
>> +
>> + if (status & STAT_OVR_ERR)
>> + port->icount.overrun++;
>> +
>> + if (status & STAT_FRM_ERR)
>> + port->icount.frame++;
>> +
>> + if (uart_handle_sysrq_char(port, ch))
>> + goto ignore_char;
>> +
>> + if (status & port->ignore_status_mask & STAT_PAR_ERR)
>> + status &= ~STAT_RX_RDY;
>> +
>> + status &= port->read_status_mask;
>> +
>> + if (status & STAT_PAR_ERR)
>> + flag = TTY_PARITY;
>> +
>> + status &= ~port->ignore_status_mask;
>> +
>> + if (status & STAT_RX_RDY)
>> + tty_insert_flip_char(tport, ch, flag);
>> +
>> + if (status & STAT_BRK_DET)
>> + tty_insert_flip_char(tport, 0, TTY_BREAK);
>> +
>> + if (status & STAT_FRM_ERR)
>> + tty_insert_flip_char(tport, 0, TTY_FRAME);
>> +
>> + if (status & STAT_OVR_ERR)
>> + tty_insert_flip_char(tport, 0, TTY_OVERRUN);
>> +
>> +ignore_char:
>> + status = readl(port->membase + UART_STAT);
>> + } while (status & (STAT_RX_RDY | STAT_BRK_DET));
>> +
>> + tty_flip_buffer_push(tport);
>> +}
>> +
>> +static void mvebu_uart_tx_chars(struct uart_port *port, unsigned int status)
>> +{
>> + struct circ_buf *xmit = &port->state->xmit;
>> + unsigned int count;
>> + unsigned int st;
>> +
>> + if (port->x_char) {
>> + writel(port->x_char, port->membase + UART_TSH);
>> + port->icount.tx++;
>> + port->x_char = 0;
>> + return;
>> + }
>> +
>> + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
>> + mvebu_uart_stop_tx(port);
>> + return;
>> + }
>> +
>> + for (count = 0; count < port->fifosize; count++) {
>> + writel(xmit->buf[xmit->tail], port->membase + UART_TSH);
>> + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
>> + port->icount.tx++;
>> +
>> + if (uart_circ_empty(xmit))
>> + break;
>> +
>> + st = readl(port->membase + UART_STAT);
>> + if (st & STAT_TX_FIFO_FUL)
>> + break;
>> + }
>> +
>> + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
>> + uart_write_wakeup(port);
>> +
>> + if (uart_circ_empty(xmit))
>> + mvebu_uart_stop_tx(port);
>> +}
>> +
>> +static irqreturn_t mvebu_uart_isr(int irq, void *dev_id)
>> +{
>> + struct uart_port *port = (struct uart_port *)dev_id;
>> + unsigned int st = readl(port->membase + UART_STAT);
>> +
>> + if (st & (STAT_RX_RDY | STAT_OVR_ERR | STAT_FRM_ERR | STAT_BRK_DET))
>> + mvebu_uart_rx_chars(port, st);
>> +
>> + if (st & STAT_TX_RDY)
>> + mvebu_uart_tx_chars(port, st);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int mvebu_uart_startup(struct uart_port *port)
>> +{
>> + int ret;
>> +
>> + writel(CTRL_TXFIFO_RST | CTRL_RXFIFO_RST,
>> + port->membase + UART_CTRL);
>> + udelay(1);
>> + writel(CTRL_RX_INT, port->membase + UART_CTRL);
>> +
>> + ret = request_irq(port->irq, mvebu_uart_isr, port->irqflags, "serial",
>> + port);
>> + if (ret) {
>> + dev_err(port->dev, "failed to request irq\n");
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void mvebu_uart_shutdown(struct uart_port *port)
>> +{
>> + writel(0, port->membase + UART_CTRL);
>> +}
>> +
>> +static void mvebu_uart_set_termios(struct uart_port *port,
>> + struct ktermios *termios,
>> + struct ktermios *old)
>> +{
>> + unsigned long flags;
>> + unsigned int baud;
>> +
>> + spin_lock_irqsave(&port->lock, flags);
>> +
>> + port->read_status_mask = STAT_RX_RDY | STAT_OVR_ERR |
>> + STAT_TX_RDY | STAT_TX_FIFO_FUL;
>> +
>> + if (termios->c_iflag & INPCK)
>> + port->read_status_mask |= STAT_FRM_ERR | STAT_PAR_ERR;
>> +
>> + port->ignore_status_mask = 0;
>> + if (termios->c_iflag & IGNPAR)
>> + port->ignore_status_mask |=
>> + STAT_FRM_ERR | STAT_PAR_ERR | STAT_OVR_ERR;
>> +
>> + if ((termios->c_cflag & CREAD) == 0)
>> + port->ignore_status_mask |= STAT_RX_RDY | STAT_BRK_ERR;
>> +
>> + if (old)
>> + tty_termios_copy_hw(termios, old);
>> +
>> + baud = uart_get_baud_rate(port, termios, old, 0, 460800);
>> + uart_update_timeout(port, termios->c_cflag, baud);
>> +
>> + spin_unlock_irqrestore(&port->lock, flags);
>> +}
>> +
>> +static const char *mvebu_uart_type(struct uart_port *port)
>> +{
>> + return MVEBU_UART_TYPE;
>> +}
>> +
>> +static void mvebu_uart_release_port(struct uart_port *port)
>> +{
>> + /* Nothing to do here */
>> +}
>> +
>> +static int mvebu_uart_request_port(struct uart_port *port)
>> +{
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_CONSOLE_POLL
>> +static int mvebu_uart_get_poll_char(struct uart_port *port)
>> +{
>> + unsigned int st = readl(port->membase + UART_STAT);
>> +
>> + if (!(st & STAT_RX_RDY))
>> + return NO_POLL_CHAR;
>> +
>> + return readl(port->membase + UART_RBR);
>> +}
>> +
>> +static void mvebu_uart_put_poll_char(struct uart_port *port, unsigned char c)
>> +{
>> + unsigned int st;
>> +
>> + for (;;) {
>> + st = readl(port->membase + UART_STAT);
>> +
>> + if (!(st & STAT_TX_FIFO_FUL))
>> + break;
>> +
>> + udelay(1);
>> + }
>> +
>> + writel(c, port->membase + UART_TSH);
>> +}
>> +#endif
>> +
>> +static const struct uart_ops mvebu_uart_ops = {
>> + .tx_empty = mvebu_uart_tx_empty,
>> + .set_mctrl = mvebu_uart_set_mctrl,
>> + .get_mctrl = mvebu_uart_get_mctrl,
>> + .stop_tx = mvebu_uart_stop_tx,
>> + .start_tx = mvebu_uart_start_tx,
>> + .stop_rx = mvebu_uart_stop_rx,
>> + .break_ctl = mvebu_uart_break_ctl,
>> + .startup = mvebu_uart_startup,
>> + .shutdown = mvebu_uart_shutdown,
>> + .set_termios = mvebu_uart_set_termios,
>> + .type = mvebu_uart_type,
>> + .release_port = mvebu_uart_release_port,
>> + .request_port = mvebu_uart_request_port,
>> +#ifdef CONFIG_CONSOLE_POLL
>> + .poll_get_char = mvebu_uart_get_poll_char,
>> + .poll_put_char = mvebu_uart_put_poll_char,
>> +#endif
>> +};
>> +
>> +/* Console Driver Operations */
>> +
>> +#ifdef CONFIG_SERIAL_MVEBU_CONSOLE
>> +/* Early Console */
>> +static void mvebu_uart_putc(struct uart_port *port, int c)
>> +{
>> + unsigned int st;
>> +
>> + for (;;) {
>> + st = readl(port->membase + UART_STAT);
>> + if (!(st & STAT_TX_FIFO_FUL))
>> + break;
>> + }
>> +
>> + writel(c, port->membase + UART_TSH);
>> +
>> + for (;;) {
>> + st = readl(port->membase + UART_STAT);
>> + if (st & STAT_TX_FIFO_EMP)
>> + break;
>> + }
>> +}
>> +
>> +static void mvebu_uart_putc_early_write(struct console *con,
>> + const char *s,
>> + unsigned n)
>> +{
>> + struct earlycon_device *dev = con->data;
>> +
>> + uart_console_write(&dev->port, s, n, mvebu_uart_putc);
>> +}
>> +
>> +static int __init
>> +mvebu_uart_early_console_setup(struct earlycon_device *device,
>> + const char *opt)
>> +{
>> + if (!device->port.membase)
>> + return -ENODEV;
>> +
>> + device->con->write = mvebu_uart_putc_early_write;
>> +
>> + return 0;
>> +}
>> +
>> +EARLYCON_DECLARE(ar3700_uart, mvebu_uart_early_console_setup);
>> +OF_EARLYCON_DECLARE(ar3700_uart, "marvell,armada-3700-uart",
>> + mvebu_uart_early_console_setup);
>> +
>> +static void wait_for_xmitr(struct uart_port *port)
>> +{
>> + u32 val;
>> +
>> + readl_poll_timeout_atomic(port->membase + UART_STAT, val,
>> + (val & STAT_TX_EMP), 1, 10000);
>> +}
>> +
>> +static void mvebu_uart_console_putchar(struct uart_port *port, int ch)
>> +{
>> + wait_for_xmitr(port);
>> + writel(ch, port->membase + UART_TSH);
>> +}
>> +
>> +static void mvebu_uart_console_write(struct console *co, const char *s,
>> + unsigned int count)
>> +{
>> + struct uart_port *port = &mvebu_uart_ports[co->index];
>> + unsigned long flags;
>> + unsigned int ier;
>> + int locked = 1;
>> +
>> + if (oops_in_progress)
>> + locked = spin_trylock_irqsave(&port->lock, flags);
>> + else
>> + spin_lock_irqsave(&port->lock, flags);
>> +
>> + ier = readl(port->membase + UART_CTRL) &
>> + (CTRL_RX_INT | CTRL_TX_RDY_INT);
>> + writel(0, port->membase + UART_CTRL);
>> +
>> + uart_console_write(port, s, count, mvebu_uart_console_putchar);
>> +
>> + wait_for_xmitr(port);
>> +
>> + if (ier)
>> + writel(ier, port->membase + UART_CTRL);
>> +
>> + if (locked)
>> + spin_unlock_irqrestore(&port->lock, flags);
>> +}
>> +
>> +static int mvebu_uart_console_setup(struct console *co, char *options)
>> +{
>> + struct uart_port *port;
>> + int baud = 9600;
>> + int bits = 8;
>> + int parity = 'n';
>> + int flow = 'n';
>> +
>> + if (co->index < 0 || co->index >= MVEBU_NR_UARTS)
>> + return -EINVAL;
>> +
>> + port = &mvebu_uart_ports[co->index];
>> +
>> + if (!port->mapbase || !port->membase) {
>> + pr_debug("console on ttyMV%i not present\n", co->index);
>> + return -ENODEV;
>> + }
>> +
>> + if (options)
>> + uart_parse_options(options, &baud, &parity, &bits, &flow);
>> +
>> + return uart_set_options(port, co, baud, parity, bits, flow);
>> +}
>> +
>> +static struct uart_driver mvebu_uart_driver;
>> +
>> +static struct console mvebu_uart_console = {
>> + .name = "ttyMV",
>> + .write = mvebu_uart_console_write,
>> + .device = uart_console_device,
>> + .setup = mvebu_uart_console_setup,
>> + .flags = CON_PRINTBUFFER,
>> + .index = -1,
>> + .data = &mvebu_uart_driver,
>> +};
>> +
>> +static int __init mvebu_uart_console_init(void)
>> +{
>> + register_console(&mvebu_uart_console);
>> + return 0;
>> +}
>> +
>> +console_initcall(mvebu_uart_console_init);
>> +
>> +
>> +#endif /* CONFIG_SERIAL_MVEBU_CONSOLE */
>> +
>> +static struct uart_driver mvebu_uart_driver = {
>> + .owner = THIS_MODULE,
>> + .driver_name = "mvebu_serial",
>> + .dev_name = "ttyMV",
>> + .nr = MVEBU_NR_UARTS,
>> +#ifdef CONFIG_SERIAL_MVEBU_CONSOLE
>> + .cons = &mvebu_uart_console,
>> +#endif
>> +};
>> +
>> +static int mvebu_uart_probe(struct platform_device *pdev)
>> +{
>> + struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> + struct uart_port *port;
>> + struct mvebu_uart_data *data;
>> + int ret;
>> +
>> + if (!reg || !irq) {
>> + dev_err(&pdev->dev, "no registers/irq defined\n");
>> + return -EINVAL;
>> + }
>> +
>> + port = &mvebu_uart_ports[0];
>> +
>> + spin_lock_init(&port->lock);
>> +
>> + port->dev = &pdev->dev;
>> + port->type = PORT_MVEBU;
>> + port->ops = &mvebu_uart_ops;
>> + port->regshift = 0;
>> +
>> + port->fifosize = 32;
>> + port->iotype = UPIO_MEM32;
>> + port->flags = UPF_FIXED_PORT;
>> + port->line = 0; /* single port: force line number to 0 */
>> +
>> + port->irq = irq->start;
>> + port->irqflags = 0;
>> + port->mapbase = reg->start;
>> +
>> + port->membase = devm_ioremap_resource(&pdev->dev, reg);
>> + if (IS_ERR(port->membase))
>> + return -PTR_ERR(port->membase);
>> +
>> + data = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_uart_data),
>> + GFP_KERNEL);
>> + if (!data)
>> + return -ENOMEM;
>> +
>> + data->port = port;
>> +
>> + port->private_data = data;
>> + platform_set_drvdata(pdev, data);
>> +
>> + ret = uart_add_one_port(&mvebu_uart_driver, port);
>> + if (ret)
>> + return ret;
>> + return 0;
>> +}
>> +
>> +static int mvebu_uart_remove(struct platform_device *pdev)
>> +{
>> + struct mvebu_uart_data *data = platform_get_drvdata(pdev);
>> +
>> + uart_remove_one_port(&mvebu_uart_driver, data->port);
>> + data->port->private_data = NULL;
>> + data->port->mapbase = 0;
>> + return 0;
>> +}
>> +
>> +/* Match table for of_platform binding */
>> +static const struct of_device_id mvebu_uart_of_match[] = {
>> + { .compatible = "marvell,armada-3700-uart", },
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(of, mvebu_uart_of_match);
>> +
>> +static struct platform_driver mvebu_uart_platform_driver = {
>> + .probe = mvebu_uart_probe,
>> + .remove = mvebu_uart_remove,
>> + .driver = {
>> + .owner = THIS_MODULE,
>> + .name = "mvebu-uart",
>> + .of_match_table = of_match_ptr(mvebu_uart_of_match),
>> + },
>> +};
>> +
>> +static int __init mvebu_uart_init(void)
>> +{
>> + int ret;
>> +
>> + ret = uart_register_driver(&mvebu_uart_driver);
>> + if (ret)
>> + return ret;
>> +
>> + ret = platform_driver_register(&mvebu_uart_platform_driver);
>> + if (ret)
>> + uart_unregister_driver(&mvebu_uart_driver);
>> +
>> + return ret;
>> +}
>> +
>> +static void __exit mvebu_uart_exit(void)
>> +{
>> + platform_driver_unregister(&mvebu_uart_platform_driver);
>> + uart_unregister_driver(&mvebu_uart_driver);
>> +}
>> +
>> +arch_initcall(mvebu_uart_init);
>> +module_exit(mvebu_uart_exit);
>> +
>> +MODULE_AUTHOR("Wilson Ding <dingwei@...vell.com>");
>> +MODULE_DESCRIPTION("Marvell Armada-3700 Serial Driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
>> index 3e5d757407fb..e513a4ee369b 100644
>> --- a/include/uapi/linux/serial_core.h
>> +++ b/include/uapi/linux/serial_core.h
>> @@ -261,4 +261,7 @@
>> /* STM32 USART */
>> #define PORT_STM32 113
>>
>> +/* MVEBU UART */
>> +#define PORT_MVEBU 114
>> +
>> #endif /* _UAPILINUX_SERIAL_CORE_H */
>> --
>> 2.5.0
>>
>
> --
> Gregory Clement, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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