lkml.org 
[lkml]   [2010]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: Reposting: [PATCH v1] serial: Add OMAP high-speed UART driver.
From

Hi Greg,

Could you please have this patch into your tty tree now?

As I do not see any further comment in community on this
for quite long time now.

--
Regards,
Govindraj.R

> This time CC'ing Linux-serial and LKML too, forgot last time.
>
> --
> Govindraj.R
>
>
> This patch adds driver support for OMAP3/4 high speed UART.
>
> This driver is made separate from 8250 driver as we cannot
> over load 8250 driver with omap platform specific configuration for
> features like DMA, it makes easier to implement features like DMA and
> hardware flow control and software flow control configuration with
> this driver as required for the omap-platform.
>
> This patch involves only the core driver and its dependent.
> This patch doesn't incorporate platform specific data as this will be
> posted from linux-omap tree and this driver was tested with Kevins PM
> branch which currently hosts the omap-serial platform data which utilises
> the omap-hwmod framework.
>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Olof Johansson <olof@lixom.net>
> Cc: Alan Cox <alan@linux.intel.com>
> Tested-by: Kevin Hilman <khilman@deeprootsystems.com>
> Signed-off-by: Govindraj R <govindraj.raja@ti.com>
> ---
> arch/arm/plat-omap/include/plat/omap-serial.h | 128 +++
> drivers/serial/Kconfig | 27 +
> drivers/serial/Makefile | 1 +
> drivers/serial/omap-serial.c | 1316 +++++++++++++++++++++++++
> include/linux/serial_core.h | 3 +
> 5 files changed, 1475 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/plat-omap/include/plat/omap-serial.h
> create mode 100644 drivers/serial/omap-serial.c
>
> diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h
> b/arch/arm/plat-omap/include/plat/omap-serial.h
> new file mode 100644
> index 0000000..2a1e7f9
> --- /dev/null
> +++ b/arch/arm/plat-omap/include/plat/omap-serial.h
> @@ -0,0 +1,128 @@
> +/*
> + * Driver for OMAP-UART controller.
> + * Based on drivers/serial/8250.c
> + *
> + * Copyright (C) 2010 Texas Instruments.
> + *
> + * Authors:
> + * Govindraj R <govindraj.raja@ti.com>
> + * Thara Gopinath <thara@ti.com>
> + *
> + * 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
> + * (at your option) any later version.
> + */
> +
> +#ifndef __OMAP_SERIAL_H__
> +#define __OMAP_SERIAL_H__
> +
> +#include <linux/serial_core.h>
> +#include <linux/platform_device.h>
> +
> +#include <plat/control.h>
> +#include <plat/mux.h>
> +
> +#define DRIVER_NAME "omap-hsuart"
> +
> +/*
> + * Use tty device name as ttyO, [O -> OMAP]
> + * in bootargs we specify as console=ttyO0 if uart1
> + * is used as console uart.
> + */
> +#define OMAP_SERIAL_NAME "ttyO"
> +
> +#define OMAP_MDR1_DISABLE 0x07
> +#define OMAP_MDR1_MODE13X 0x03
> +#define OMAP_MDR1_MODE16X 0x00
> +#define OMAP_MODE13X_SPEED 230400
> +
> +/*
> + * LCR = 0XBF: Switch to Configuration Mode B.
> + * In configuration mode b allow access
> + * to EFR,DLL,DLH.
> + * Reference OMAP TRM Chapter 17
> + * Section: 1.4.3 Mode Selection
> + */
> +#define OMAP_UART_LCR_CONF_MDB 0XBF
> +
> +/* WER = 0x7F
> + * Enable module level wakeup in WER reg
> + */
> +#define OMAP_UART_WER_MOD_WKUP 0X7F
> +
> +/* Enable XON/XOFF flow control on output */
> +#define OMAP_UART_SW_TX 0x04
> +
> +/* Enable XON/XOFF flow control on input */
> +#define OMAP_UART_SW_RX 0x04
> +
> +#define OMAP_UART_SYSC_RESET 0X07
> +#define OMAP_UART_TCR_TRIG 0X0F
> +#define OMAP_UART_SW_CLR 0XF0
> +
> +#define OMAP_UART_DMA_CH_FREE -1
> +
> +#define RX_TIMEOUT (3 * HZ)
> +#define OMAP_MAX_HSUART_PORTS 4
> +
> +#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
> +
> +struct omap_uart_port_info {
> + bool dma_enabled; /* To specify DMA Mode */
> + unsigned int uartclk; /* UART clock rate */
> + void __iomem *membase; /* ioremap cookie or NULL */
> + resource_size_t mapbase; /* resource base */
> + unsigned long irqflags; /* request_irq flags */
> + upf_t flags; /* UPF_* flags */
> +};
> +
> +struct uart_omap_dma {
> + u8 uart_dma_tx;
> + u8 uart_dma_rx;
> + int rx_dma_channel;
> + int tx_dma_channel;
> + dma_addr_t rx_buf_dma_phys;
> + dma_addr_t tx_buf_dma_phys;
> + unsigned int uart_base;
> + /*
> + * Buffer for rx dma.It is not required for tx because the buffer
> + * comes from port structure.
> + */
> + unsigned char *rx_buf;
> + unsigned int prev_rx_dma_pos;
> + int tx_buf_size;
> + int tx_dma_used;
> + int rx_dma_used;
> + spinlock_t tx_lock;
> + spinlock_t rx_lock;
> + /* timer to poll activity on rx dma */
> + struct timer_list rx_timer;
> + int rx_buf_size;
> + int rx_timeout;
> +};
> +
> +struct uart_omap_port {
> + struct uart_port port;
> + struct uart_omap_dma uart_dma;
> + struct platform_device *pdev;
> +
> + unsigned char ier;
> + unsigned char lcr;
> + unsigned char mcr;
> + unsigned char fcr;
> + unsigned char efr;
> +
> + int use_dma;
> + /*
> + * Some bits in registers are cleared on a read, so they must
> + * be saved whenever the register is read but the bits will not
> + * be immediately processed.
> + */
> + unsigned int lsr_break_flag;
> + unsigned char msr_saved_flags;
> + char name[20];
> + unsigned long port_activity;
> +};
> +
> +#endif /* __OMAP_SERIAL_H__ */
> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> index 9ff47db..95055e7 100644
> --- a/drivers/serial/Kconfig
> +++ b/drivers/serial/Kconfig
> @@ -1366,6 +1366,33 @@ config SERIAL_OF_PLATFORM
> Currently, only 8250 compatible ports are supported, but
> others can easily be added.
>
> +config SERIAL_OMAP
> + tristate "OMAP serial port support"
> + depends on ARCH_OMAP3 || ARCH_OMAP4
> + select SERIAL_CORE
> + help
> + If you have a machine based on an Texas Instruments OMAP CPU you
> + can enable its onboard serial ports by enabling this option.
> +
> + By enabling this option you take advantage of dma feature available
> + with the omap-serial driver. DMA support can be enabled from platform
> + data.
> +
> +config SERIAL_OMAP_CONSOLE
> + bool "Console on OMAP serial port"
> + depends on SERIAL_OMAP
> + select SERIAL_CORE_CONSOLE
> + help
> + Select this option if you would like to use omap serial port as
> + console.
> +
> + Even if you say Y here, the currently visible virtual console
> + (/dev/tty0) will still be used as the system console by default, but
> + you can alter that using a kernel command line option such as
> + "console=ttyOx". (Try "man bootparam" or see the documentation of
> + your boot loader about how to pass options to the kernel at
> + boot time.)
> +
> config SERIAL_OF_PLATFORM_NWPSERIAL
> tristate "NWP serial port driver"
> depends on PPC_OF && PPC_DCR
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index 5548fe7..42962b3 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -82,3 +82,4 @@ obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
> obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
> obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o
> obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
> +obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
> diff --git a/drivers/serial/omap-serial.c b/drivers/serial/omap-serial.c
> new file mode 100644
> index 0000000..3e6d608
> --- /dev/null
> +++ b/drivers/serial/omap-serial.c
> @@ -0,0 +1,1316 @@
> +/*
> + * Driver for OMAP-UART controller.
> + * Based on drivers/serial/8250.c
> + *
> + * Copyright (C) 2010 Texas Instruments.
> + *
> + * Authors:
> + * Govindraj R <govindraj.raja@ti.com>
> + * Thara Gopinath <thara@ti.com>
> + *
> + * 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
> + * (at your option) any later version.
> + *
> + * Note: This driver is made seperate from 8250 driver as we cannot
> + * over load 8250 driver with omap platform specific configuration for
> + * features like DMA, it makes easier to implement features like DMA and
> + * hardware flow control and software flow control configuration with
> + * this driver as required for the omap-platform.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/console.h>
> +#include <linux/serial_reg.h>
> +#include <linux/delay.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +#include <linux/io.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/clk.h>
> +#include <linux/serial_core.h>
> +
> +#include <asm/irq.h>
> +#include <plat/dma.h>
> +#include <plat/dmtimer.h>
> +#include <plat/omap-serial.h>
> +
> +static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
> +
> +/* Forward declaration of functions */
> +static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
> +static void serial_omap_rx_timeout(unsigned long uart_no);
> +static int serial_omap_start_rxdma(struct uart_omap_port *up);
> +
> +static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
> +{
> + offset <<= up->port.regshift;
> + return readw(up->port.membase + offset);
> +}
> +
> +static inline void serial_out(struct uart_omap_port *up, int offset, int value)
> +{
> + offset <<= up->port.regshift;
> + writew(value, up->port.membase + offset);
> +}
> +
> +static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
> +{
> + serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
> + serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
> + UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
> + serial_out(up, UART_FCR, 0);
> +}
> +
> +/**
> + * serial_omap_get_divisor() - calculate divisor value
> + * @port: uart port info
> + * @baud: baudrate for which divisor needs to be calculated.
> + *
> + * We have written our own function to get the divisor so as to support
> + * 13x mode. 3Mbps Baudrate as an different divisor.
> + * Reference OMAP TRM Chapter 17:
> + * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
> + * referring to oversampling - divisor value
> + * baudrate 460,800 to 3,686,400 all have divisor 13
> + * except 3,000,000 which has divisor value 16
> + */
> +static unsigned int
> +serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
> +{
> + unsigned int divisor;
> +
> + if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
> + divisor = 13;
> + else
> + divisor = 16;
> + return port->uartclk/(baud * divisor);
> +}
> +
> +static void serial_omap_stop_rxdma(struct uart_omap_port *up)
> +{
> + if (up->uart_dma.rx_dma_used) {
> + del_timer_sync(&up->uart_dma.rx_timer);
> + omap_stop_dma(up->uart_dma.rx_dma_channel);
> + omap_free_dma(up->uart_dma.rx_dma_channel);
> + up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
> + up->uart_dma.rx_dma_used = false;
> + }
> +}
> +
> +static void serial_omap_enable_ms(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> + dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id);
> + up->ier |= UART_IER_MSI;
> + serial_out(up, UART_IER, up->ier);
> +}
> +
> +static void serial_omap_stop_tx(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> + if (up->use_dma &&
> + up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
> + /*
> + * Check if dma is still active. If yes do nothing,
> + * return. Else stop dma
> + */
> + if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
> + return;
> + omap_stop_dma(up->uart_dma.tx_dma_channel);
> + omap_free_dma(up->uart_dma.tx_dma_channel);
> + up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
> + }
> +
> + if (up->ier & UART_IER_THRI) {
> + up->ier &= ~UART_IER_THRI;
> + serial_out(up, UART_IER, up->ier);
> + }
> +}
> +
> +static void serial_omap_stop_rx(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> + if (up->use_dma)
> + serial_omap_stop_rxdma(up);
> + up->ier &= ~UART_IER_RLSI;
> + up->port.read_status_mask &= ~UART_LSR_DR;
> + serial_out(up, UART_IER, up->ier);
> +}
> +
> +static inline void receive_chars(struct uart_omap_port *up, int *status)
> +{
> + struct tty_struct *tty = up->port.state->port.tty;
> + unsigned int flag;
> + unsigned char ch, lsr = *status;
> + int max_count = 256;
> +
> + do {
> + if (likely(lsr & UART_LSR_DR))
> + ch = serial_in(up, UART_RX);
> + flag = TTY_NORMAL;
> + up->port.icount.rx++;
> +
> + if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
> + /*
> + * For statistics only
> + */
> + if (lsr & UART_LSR_BI) {
> + lsr &= ~(UART_LSR_FE | UART_LSR_PE);
> + up->port.icount.brk++;
> + /*
> + * We do the SysRQ and SAK checking
> + * here because otherwise the break
> + * may get masked by ignore_status_mask
> + * or read_status_mask.
> + */
> + if (uart_handle_break(&up->port))
> + goto ignore_char;
> + } else if (lsr & UART_LSR_PE)
> + up->port.icount.parity++;
> + else if (lsr & UART_LSR_FE)
> + up->port.icount.frame++;
> + if (lsr & UART_LSR_OE)
> + up->port.icount.overrun++;
> +
> + /*
> + * Mask off conditions which should be ignored.
> + */
> + lsr &= up->port.read_status_mask;
> +
> +#ifdef CONFIG_SERIAL_OMAP_CONSOLE
> + if (up->port.line == up->port.cons->index) {
> + /* Recover the break flag from console xmit */
> + lsr |= up->lsr_break_flag;
> + up->lsr_break_flag = 0;
> + }
> +#endif
> + if (lsr & UART_LSR_BI)
> + flag = TTY_BREAK;
> + else if (lsr & UART_LSR_PE)
> + flag = TTY_PARITY;
> + else if (lsr & UART_LSR_FE)
> + flag = TTY_FRAME;
> + }
> +
> + if (uart_handle_sysrq_char(&up->port, ch))
> + goto ignore_char;
> + uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
> +ignore_char:
> + lsr = serial_in(up, UART_LSR);
> + } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
> + spin_unlock(&up->port.lock);
> + tty_flip_buffer_push(tty);
> + spin_lock(&up->port.lock);
> +}
> +
> +static void transmit_chars(struct uart_omap_port *up)
> +{
> + struct circ_buf *xmit = &up->port.state->xmit;
> + int count;
> +
> + if (up->port.x_char) {
> + serial_out(up, UART_TX, up->port.x_char);
> + up->port.icount.tx++;
> + up->port.x_char = 0;
> + return;
> + }
> + if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
> + serial_omap_stop_tx(&up->port);
> + return;
> + }
> + count = up->port.fifosize / 4;
> + do {
> + serial_out(up, UART_TX, xmit->buf[xmit->tail]);
> + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> + up->port.icount.tx++;
> + if (uart_circ_empty(xmit))
> + break;
> + } while (--count > 0);
> +
> + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> + uart_write_wakeup(&up->port);
> +
> + if (uart_circ_empty(xmit))
> + serial_omap_stop_tx(&up->port);
> +}
> +
> +static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
> +{
> + if (!(up->ier & UART_IER_THRI)) {
> + up->ier |= UART_IER_THRI;
> + serial_out(up, UART_IER, up->ier);
> + }
> +}
> +
> +static void serial_omap_start_tx(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + struct circ_buf *xmit;
> + unsigned int start;
> + int ret = 0;
> +
> + if (!up->use_dma || up->port.x_char) {
> + serial_omap_enable_ier_thri(up);
> + return;
> + }
> +
> + xmit = &up->port.state->xmit;
> + if (uart_circ_empty(xmit) || up->uart_dma.tx_dma_used)
> + return;
> +
> + if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE)
> + ret = omap_request_dma(up->uart_dma.uart_dma_tx,
> + "UART Tx DMA",
> + (void *)uart_tx_dma_callback, up,
> + &(up->uart_dma.tx_dma_channel));
> +
> + if (ret < 0) {
> + serial_omap_enable_ier_thri(up);
> + return;
> + }
> +
> + start = up->uart_dma.tx_buf_dma_phys +
> + (xmit->tail & (UART_XMIT_SIZE - 1));
> + spin_lock(&(up->uart_dma.tx_lock));
> + up->uart_dma.tx_dma_used = true;
> + spin_unlock(&(up->uart_dma.tx_lock));
> +
> + up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
> + /*
> + * It is a circular buffer. See if the buffer has wounded back.
> + * If yes it will have to be transferred in two separate dma
> + * transfers
> + */
> + if (start + up->uart_dma.tx_buf_size >=
> + up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
> + up->uart_dma.tx_buf_size =
> + (up->uart_dma.tx_buf_dma_phys +
> + UART_XMIT_SIZE) - start;
> +
> + omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
> + OMAP_DMA_AMODE_CONSTANT,
> + up->uart_dma.uart_base, 0, 0);
> + omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
> + OMAP_DMA_AMODE_POST_INC, start, 0, 0);
> + omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
> + OMAP_DMA_DATA_TYPE_S8,
> + up->uart_dma.tx_buf_size, 1,
> + OMAP_DMA_SYNC_ELEMENT,
> + up->uart_dma.uart_dma_tx, 0);
> + /* FIXME: Cache maintenance needed here? */
> + omap_start_dma(up->uart_dma.tx_dma_channel);
> +}
> +
> +static unsigned int check_modem_status(struct uart_omap_port *up)
> +{
> + int status;
> + status = serial_in(up, UART_MSR);
> +
> + status |= up->msr_saved_flags;
> + up->msr_saved_flags = 0;
> +
> + if ((status & UART_MSR_ANY_DELTA) == 0)
> + return status;
> + if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
> + up->port.state != NULL) {
> + if (status & UART_MSR_TERI)
> + up->port.icount.rng++;
> + if (status & UART_MSR_DDSR)
> + up->port.icount.dsr++;
> + if (status & UART_MSR_DDCD)
> + uart_handle_dcd_change
> + (&up->port, status & UART_MSR_DCD);
> + if (status & UART_MSR_DCTS)
> + uart_handle_cts_change
> + (&up->port, status & UART_MSR_CTS);
> + wake_up_interruptible(&up->port.state->port.delta_msr_wait);
> + }
> +
> + return status;
> +}
> +
> +/**
> + * serial_omap_irq() - This handles the interrupt from one port
> + * @irq: uart port irq number
> + * @dev_id: uart port info
> + */
> +static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
> +{
> + struct uart_omap_port *up = dev_id;
> + unsigned int iir, lsr;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&up->port.lock, flags);
> + iir = serial_in(up, UART_IIR);
> + if (iir & UART_IIR_NO_INT)
> + return IRQ_NONE;
> +
> + lsr = serial_in(up, UART_LSR);
> + if (iir & UART_IER_RLSI) {
> + if (up->use_dma)
> + up->ier &= ~UART_IER_RDI;
> + serial_out(up, UART_IER, up->ier);
> + if (!up->use_dma ||
> + serial_omap_start_rxdma(up) != 0)
> + if (lsr & UART_LSR_DR)
> + receive_chars(up, &lsr);
> + }
> +
> + check_modem_status(up);
> + if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
> + transmit_chars(up);
> +
> + spin_unlock_irqrestore(&up->port.lock, flags);
> + up->port_activity = jiffies;
> + return IRQ_HANDLED;
> +}
> +
> +static unsigned int serial_omap_tx_empty(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned long flags = 0;
> + unsigned int ret = 0;
> +
> + dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id);
> + spin_lock_irqsave(&up->port.lock, flags);
> + ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
> + spin_unlock_irqrestore(&up->port.lock, flags);
> +
> + return ret;
> +}
> +
> +static unsigned int serial_omap_get_mctrl(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned char status;
> + unsigned int ret = 0;
> +
> + status = check_modem_status(up);
> + dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id);
> +
> + if (status & UART_MSR_DCD)
> + ret |= TIOCM_CAR;
> + if (status & UART_MSR_RI)
> + ret |= TIOCM_RNG;
> + if (status & UART_MSR_DSR)
> + ret |= TIOCM_DSR;
> + if (status & UART_MSR_CTS)
> + ret |= TIOCM_CTS;
> + return ret;
> +}
> +
> +static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned char mcr = 0;
> +
> + dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id);
> + if (mctrl & TIOCM_RTS)
> + mcr |= UART_MCR_RTS;
> + if (mctrl & TIOCM_DTR)
> + mcr |= UART_MCR_DTR;
> + if (mctrl & TIOCM_OUT1)
> + mcr |= UART_MCR_OUT1;
> + if (mctrl & TIOCM_OUT2)
> + mcr |= UART_MCR_OUT2;
> + if (mctrl & TIOCM_LOOP)
> + mcr |= UART_MCR_LOOP;
> +
> + mcr |= up->mcr;
> + serial_out(up, UART_MCR, mcr);
> +}
> +
> +static void serial_omap_break_ctl(struct uart_port *port, int break_state)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned long flags = 0;
> +
> + dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id);
> + spin_lock_irqsave(&up->port.lock, flags);
> + if (break_state == -1)
> + up->lcr |= UART_LCR_SBC;
> + else
> + up->lcr &= ~UART_LCR_SBC;
> + serial_out(up, UART_LCR, up->lcr);
> + spin_unlock_irqrestore(&up->port.lock, flags);
> +}
> +
> +static int serial_omap_startup(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned long flags = 0;
> + int retval;
> +
> + /*
> + * Allocate the IRQ
> + */
> + retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
> + up->name, up);
> + if (retval)
> + return retval;
> +
> + dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id);
> +
> + /*
> + * Clear the FIFO buffers and disable them.
> + * (they will be reenabled in set_termios())
> + */
> + serial_omap_clear_fifos(up);
> + /* For Hardware flow control */
> + serial_out(up, UART_MCR, UART_MCR_RTS);
> +
> + /*
> + * Clear the interrupt registers.
> + */
> + (void) serial_in(up, UART_LSR);
> + if (serial_in(up, UART_LSR) & UART_LSR_DR)
> + (void) serial_in(up, UART_RX);
> + (void) serial_in(up, UART_IIR);
> + (void) serial_in(up, UART_MSR);
> +
> + /*
> + * Now, initialize the UART
> + */
> + serial_out(up, UART_LCR, UART_LCR_WLEN8);
> + spin_lock_irqsave(&up->port.lock, flags);
> + /*
> + * Most PC uarts need OUT2 raised to enable interrupts.
> + */
> + up->port.mctrl |= TIOCM_OUT2;
> + serial_omap_set_mctrl(&up->port, up->port.mctrl);
> + spin_unlock_irqrestore(&up->port.lock, flags);
> +
> + up->msr_saved_flags = 0;
> + if (up->use_dma) {
> + free_page((unsigned long)up->port.state->xmit.buf);
> + up->port.state->xmit.buf = dma_alloc_coherent(NULL,
> + UART_XMIT_SIZE,
> + (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
> + 0);
> + init_timer(&(up->uart_dma.rx_timer));
> + up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
> + up->uart_dma.rx_timer.data = up->pdev->id;
> + /* Currently the buffer size is 4KB. Can increase it */
> + up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
> + up->uart_dma.rx_buf_size,
> + (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
> + }
> + /*
> + * Finally, enable interrupts. Note: Modem status interrupts
> + * are set via set_termios(), which will be occurring imminently
> + * anyway, so we don't enable them here.
> + */
> + up->ier = UART_IER_RLSI | UART_IER_RDI;
> + serial_out(up, UART_IER, up->ier);
> +
> + up->port_activity = jiffies;
> + return 0;
> +}
> +
> +static void serial_omap_shutdown(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned long flags = 0;
> +
> + dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id);
> + /*
> + * Disable interrupts from this port
> + */
> + up->ier = 0;
> + serial_out(up, UART_IER, 0);
> +
> + spin_lock_irqsave(&up->port.lock, flags);
> + up->port.mctrl &= ~TIOCM_OUT2;
> + serial_omap_set_mctrl(&up->port, up->port.mctrl);
> + spin_unlock_irqrestore(&up->port.lock, flags);
> +
> + /*
> + * Disable break condition and FIFOs
> + */
> + serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
> + serial_omap_clear_fifos(up);
> +
> + /*
> + * Read data port to reset things, and then free the irq
> + */
> + if (serial_in(up, UART_LSR) & UART_LSR_DR)
> + (void) serial_in(up, UART_RX);
> + if (up->use_dma) {
> + int tmp;
> + dma_free_coherent(up->port.dev,
> + UART_XMIT_SIZE, up->port.state->xmit.buf,
> + up->uart_dma.tx_buf_dma_phys);
> + up->port.state->xmit.buf = NULL;
> + serial_omap_stop_rx(port);
> + dma_free_coherent(up->port.dev,
> + up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
> + up->uart_dma.rx_buf_dma_phys);
> + up->uart_dma.rx_buf = NULL;
> + tmp = serial_in(up, UART_OMAP_SYSC) & OMAP_UART_SYSC_RESET;
> + serial_out(up, UART_OMAP_SYSC, tmp); /* force-idle */
> + }
> + free_irq(up->port.irq, up);
> +}
> +
> +static inline void
> +serial_omap_configure_xonxoff
> + (struct uart_omap_port *up, struct ktermios *termios)
> +{
> + unsigned char efr = 0;
> +
> + up->lcr = serial_in(up, UART_LCR);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> + up->efr = serial_in(up, UART_EFR);
> + serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
> +
> + serial_out(up, UART_XON1, termios->c_cc[VSTART]);
> + serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
> +
> + /* clear SW control mode bits */
> + efr = up->efr;
> + efr &= OMAP_UART_SW_CLR;
> +
> + /*
> + * IXON Flag:
> + * Enable XON/XOFF flow control on output.
> + * Transmit XON1, XOFF1
> + */
> + if (termios->c_iflag & IXON)
> + efr |= OMAP_UART_SW_TX;
> +
> + /*
> + * IXOFF Flag:
> + * Enable XON/XOFF flow control on input.
> + * Receiver compares XON1, XOFF1.
> + */
> + if (termios->c_iflag & IXOFF)
> + efr |= OMAP_UART_SW_RX;
> +
> + serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> + serial_out(up, UART_LCR, UART_LCR_DLAB);
> +
> + up->mcr = serial_in(up, UART_MCR);
> +
> + /*
> + * IXANY Flag:
> + * Enable any character to restart output.
> + * Operation resumes after receiving any
> + * character after recognition of the XOFF character
> + */
> + if (termios->c_iflag & IXANY)
> + up->mcr |= UART_MCR_XONANY;
> +
> + serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> + serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
> + /* Enable special char function UARTi.EFR_REG[5] and
> + * load the new software flow control mode IXON or IXOFF
> + * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
> + */
> + serial_out(up, UART_EFR, efr | UART_EFR_SCD);
> + serial_out(up, UART_LCR, UART_LCR_DLAB);
> +
> + serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
> + serial_out(up, UART_LCR, up->lcr);
> +}
> +
> +static void
> +serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
> + struct ktermios *old)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned char cval = 0;
> + unsigned char efr = 0;
> + unsigned long flags = 0;
> + unsigned int baud, quot;
> +
> + switch (termios->c_cflag & CSIZE) {
> + case CS5:
> + cval = UART_LCR_WLEN5;
> + break;
> + case CS6:
> + cval = UART_LCR_WLEN6;
> + break;
> + case CS7:
> + cval = UART_LCR_WLEN7;
> + break;
> + default:
> + case CS8:
> + cval = UART_LCR_WLEN8;
> + break;
> + }
> +
> + if (termios->c_cflag & CSTOPB)
> + cval |= UART_LCR_STOP;
> + if (termios->c_cflag & PARENB)
> + cval |= UART_LCR_PARITY;
> + if (!(termios->c_cflag & PARODD))
> + cval |= UART_LCR_EPAR;
> +
> + /*
> + * Ask the core to calculate the divisor for us.
> + */
> +
> + baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
> + quot = serial_omap_get_divisor(port, baud);
> +
> + up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
> + UART_FCR_ENABLE_FIFO;
> + if (up->use_dma)
> + up->fcr |= UART_FCR_DMA_SELECT;
> +
> + /*
> + * Ok, we're now changing the port state. Do it with
> + * interrupts disabled.
> + */
> + spin_lock_irqsave(&up->port.lock, flags);
> +
> + /*
> + * Update the per-port timeout.
> + */
> + uart_update_timeout(port, termios->c_cflag, baud);
> +
> + up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
> + if (termios->c_iflag & INPCK)
> + up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
> + if (termios->c_iflag & (BRKINT | PARMRK))
> + up->port.read_status_mask |= UART_LSR_BI;
> +
> + /*
> + * Characters to ignore
> + */
> + up->port.ignore_status_mask = 0;
> + if (termios->c_iflag & IGNPAR)
> + up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
> + if (termios->c_iflag & IGNBRK) {
> + up->port.ignore_status_mask |= UART_LSR_BI;
> + /*
> + * If we're ignoring parity and break indicators,
> + * ignore overruns too (for real raw support).
> + */
> + if (termios->c_iflag & IGNPAR)
> + up->port.ignore_status_mask |= UART_LSR_OE;
> + }
> +
> + /*
> + * ignore all characters if CREAD is not set
> + */
> + if ((termios->c_cflag & CREAD) == 0)
> + up->port.ignore_status_mask |= UART_LSR_DR;
> +
> + /*
> + * Modem status interrupts
> + */
> + up->ier &= ~UART_IER_MSI;
> + if (UART_ENABLE_MS(&up->port, termios->c_cflag))
> + up->ier |= UART_IER_MSI;
> + serial_out(up, UART_IER, up->ier);
> + serial_out(up, UART_LCR, cval); /* reset DLAB */
> +
> + /* FIFOs and DMA Settings */
> +
> + /* FCR can be changed only when the
> + * baud clock is not running
> + * DLL_REG and DLH_REG set to 0.
> + */
> + serial_out(up, UART_LCR, UART_LCR_DLAB);
> + serial_out(up, UART_DLL, 0);
> + serial_out(up, UART_DLM, 0);
> + serial_out(up, UART_LCR, 0);
> +
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> + up->efr = serial_in(up, UART_EFR);
> + serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +
> + serial_out(up, UART_LCR, 0);
> + up->mcr = serial_in(up, UART_MCR);
> + serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
> + /* FIFO ENABLE, DMA MODE */
> + serial_out(up, UART_FCR, up->fcr);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> + if (up->use_dma) {
> + serial_out(up, UART_TI752_TLR, 0);
> + serial_out(up, UART_OMAP_SCR,
> + (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8));
> + }
> +
> + serial_out(up, UART_EFR, up->efr);
> + serial_out(up, UART_LCR, UART_LCR_DLAB);
> + serial_out(up, UART_MCR, up->mcr);
> +
> + /* Protocol, Baud Rate, and Interrupt Settings */
> +
> + serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_DISABLE);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> + up->efr = serial_in(up, UART_EFR);
> + serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +
> + serial_out(up, UART_LCR, 0);
> + serial_out(up, UART_IER, 0);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> + serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
> + serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
> +
> + serial_out(up, UART_LCR, 0);
> + serial_out(up, UART_IER, up->ier);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> +
> + serial_out(up, UART_EFR, up->efr);
> + serial_out(up, UART_LCR, cval);
> +
> + if (baud > 230400 && baud != 3000000)
> + serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE13X);
> + else
> + serial_out(up, UART_OMAP_MDR1, OMAP_MDR1_MODE16X);
> +
> + /* Hardware Flow Control Configuration */
> +
> + if (termios->c_cflag & CRTSCTS) {
> + efr |= (UART_EFR_CTS | UART_EFR_RTS);
> + serial_out(up, UART_LCR, UART_LCR_DLAB);
> +
> + up->mcr = serial_in(up, UART_MCR);
> + serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
> +
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> + up->efr = serial_in(up, UART_EFR);
> + serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
> +
> + serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
> + serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
> + serial_out(up, UART_LCR, UART_LCR_DLAB);
> + serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
> + serial_out(up, UART_LCR, cval);
> + }
> +
> + serial_omap_set_mctrl(&up->port, up->port.mctrl);
> + /* Software Flow Control Configuration */
> + if (termios->c_iflag & (IXON | IXOFF))
> + serial_omap_configure_xonxoff(up, termios);
> +
> + spin_unlock_irqrestore(&up->port.lock, flags);
> + dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id);
> +}
> +
> +static void
> +serial_omap_pm(struct uart_port *port, unsigned int state,
> + unsigned int oldstate)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> + unsigned char efr;
> +
> + dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id);
> + efr = serial_in(up, UART_EFR);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> + serial_out(up, UART_EFR, efr | UART_EFR_ECB);
> + serial_out(up, UART_LCR, 0);
> +
> + serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
> + serial_out(up, UART_LCR, OMAP_UART_LCR_CONF_MDB);
> + serial_out(up, UART_EFR, efr);
> + serial_out(up, UART_LCR, 0);
> + /* Enable module level wake up */
> + serial_out(up, UART_OMAP_WER,
> + (state != 0) ? OMAP_UART_WER_MOD_WKUP : 0);
> +}
> +
> +static void serial_omap_release_port(struct uart_port *port)
> +{
> + dev_dbg(port->dev, "serial_omap_release_port+\n");
> +}
> +
> +static int serial_omap_request_port(struct uart_port *port)
> +{
> + dev_dbg(port->dev, "serial_omap_request_port+\n");
> + return 0;
> +}
> +
> +static void serial_omap_config_port(struct uart_port *port, int flags)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> + dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
> + up->pdev->id);
> + up->port.type = PORT_OMAP;
> +}
> +
> +static int
> +serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
> +{
> + /* we don't want the core code to modify any port params */
> + dev_dbg(port->dev, "serial_omap_verify_port+\n");
> + return -EINVAL;
> +}
> +
> +static const char *
> +serial_omap_type(struct uart_port *port)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> + dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id);
> + return up->name;
> +}
> +
> +#ifdef CONFIG_SERIAL_OMAP_CONSOLE
> +
> +static struct uart_omap_port *serial_omap_console_ports[4];
> +
> +static struct uart_driver serial_omap_reg;
> +
> +#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
> +
> +static inline void wait_for_xmitr(struct uart_omap_port *up)
> +{
> + unsigned int status, tmout = 10000;
> +
> + /* Wait up to 10ms for the character(s) to be sent. */
> + do {
> + status = serial_in(up, UART_LSR);
> +
> + if (status & UART_LSR_BI)
> + up->lsr_break_flag = UART_LSR_BI;
> +
> + if (--tmout == 0)
> + break;
> + udelay(1);
> + } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
> +
> + /* Wait up to 1s for flow control if necessary */
> + if (up->port.flags & UPF_CONS_FLOW) {
> + tmout = 1000000;
> + for (tmout = 1000000; tmout; tmout--) {
> + unsigned int msr = serial_in(up, UART_MSR);
> + up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
> + if (msr & UART_MSR_CTS)
> + break;
> + udelay(1);
> + }
> + }
> +}
> +
> +static void serial_omap_console_putchar(struct uart_port *port, int ch)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)port;
> +
> + wait_for_xmitr(up);
> + serial_out(up, UART_TX, ch);
> +}
> +
> +static void
> +serial_omap_console_write(struct console *co, const char *s,
> + unsigned int count)
> +{
> + struct uart_omap_port *up = serial_omap_console_ports[co->index];
> + unsigned int ier;
> +
> + /*
> + * First save the IER then disable the interrupts
> + */
> + ier = serial_in(up, UART_IER);
> + serial_out(up, UART_IER, 0);
> +
> + uart_console_write(&up->port, s, count, serial_omap_console_putchar);
> +
> + /*
> + * Finally, wait for transmitter to become empty
> + * and restore the IER
> + */
> + wait_for_xmitr(up);
> + serial_out(up, UART_IER, ier);
> + /*
> + * The receive handling will happen properly because the
> + * receive ready bit will still be set; it is not cleared
> + * on read. However, modem control will not, we must
> + * call it if we have saved something in the saved flags
> + * while processing with interrupts off.
> + */
> + if (up->msr_saved_flags)
> + check_modem_status(up);
> +}
> +
> +static int __init
> +serial_omap_console_setup(struct console *co, char *options)
> +{
> + struct uart_omap_port *up;
> + int baud = 115200;
> + int bits = 8;
> + int parity = 'n';
> + int flow = 'n';
> + int r;
> +
> + if (serial_omap_console_ports[co->index] == NULL)
> + return -ENODEV;
> + up = serial_omap_console_ports[co->index];
> +
> + if (options)
> + uart_parse_options(options, &baud, &parity, &bits, &flow);
> +
> + r = uart_set_options(&up->port, co, baud, parity, bits, flow);
> +
> + return r;
> +}
> +
> +static struct console serial_omap_console = {
> + .name = OMAP_SERIAL_NAME,
> + .write = serial_omap_console_write,
> + .device = uart_console_device,
> + .setup = serial_omap_console_setup,
> + .flags = CON_PRINTBUFFER,
> + .index = -1,
> + .data = &serial_omap_reg,
> +};
> +
> +static void serial_omap_add_console_port(struct uart_omap_port *up)
> +{
> + serial_omap_console_ports[up->pdev->id] = up;
> +}
> +
> +#define OMAP_CONSOLE (&serial_omap_console)
> +
> +#else
> +
> +#define OMAP_CONSOLE NULL
> +
> +static inline void serial_omap_add_console_port(struct uart_omap_port *up)
> +{}
> +
> +#endif
> +
> +struct uart_ops serial_omap_pops = {
> + .tx_empty = serial_omap_tx_empty,
> + .set_mctrl = serial_omap_set_mctrl,
> + .get_mctrl = serial_omap_get_mctrl,
> + .stop_tx = serial_omap_stop_tx,
> + .start_tx = serial_omap_start_tx,
> + .stop_rx = serial_omap_stop_rx,
> + .enable_ms = serial_omap_enable_ms,
> + .break_ctl = serial_omap_break_ctl,
> + .startup = serial_omap_startup,
> + .shutdown = serial_omap_shutdown,
> + .set_termios = serial_omap_set_termios,
> + .pm = serial_omap_pm,
> + .type = serial_omap_type,
> + .release_port = serial_omap_release_port,
> + .request_port = serial_omap_request_port,
> + .config_port = serial_omap_config_port,
> + .verify_port = serial_omap_verify_port,
> +};
> +
> +static struct uart_driver serial_omap_reg = {
> + .owner = THIS_MODULE,
> + .driver_name = "OMAP-SERIAL",
> + .dev_name = OMAP_SERIAL_NAME,
> + .nr = OMAP_MAX_HSUART_PORTS,
> + .cons = OMAP_CONSOLE,
> +};
> +
> +static int
> +serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> + struct uart_omap_port *up = platform_get_drvdata(pdev);
> +
> + if (up)
> + uart_suspend_port(&serial_omap_reg, &up->port);
> + return 0;
> +}
> +
> +static int serial_omap_resume(struct platform_device *dev)
> +{
> + struct uart_omap_port *up = platform_get_drvdata(dev);
> +
> + if (up)
> + uart_resume_port(&serial_omap_reg, &up->port);
> + return 0;
> +}
> +
> +static void serial_omap_rx_timeout(unsigned long uart_no)
> +{
> + struct uart_omap_port *up = ui[uart_no];
> + unsigned int curr_dma_pos, curr_transmitted_size;
> + unsigned int ret = 0;
> +
> + curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
> + if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
> + (curr_dma_pos == 0)) {
> + if (jiffies_to_msecs(jiffies - up->port_activity) <
> + RX_TIMEOUT) {
> + mod_timer(&up->uart_dma.rx_timer, jiffies +
> + usecs_to_jiffies(up->uart_dma.rx_timeout));
> + } else {
> + serial_omap_stop_rxdma(up);
> + up->ier |= UART_IER_RDI;
> + serial_out(up, UART_IER, up->ier);
> + }
> + return;
> + }
> +
> + curr_transmitted_size = curr_dma_pos -
> + up->uart_dma.prev_rx_dma_pos;
> + up->port.icount.rx += curr_transmitted_size;
> + tty_insert_flip_string(up->port.state->port.tty,
> + up->uart_dma.rx_buf +
> + (up->uart_dma.prev_rx_dma_pos -
> + up->uart_dma.rx_buf_dma_phys),
> + curr_transmitted_size);
> + tty_flip_buffer_push(up->port.state->port.tty);
> + up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
> + if (up->uart_dma.rx_buf_size +
> + up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
> + ret = serial_omap_start_rxdma(up);
> + if (ret < 0) {
> + serial_omap_stop_rxdma(up);
> + up->ier |= UART_IER_RDI;
> + serial_out(up, UART_IER, up->ier);
> + }
> + } else {
> + mod_timer(&up->uart_dma.rx_timer, jiffies +
> + usecs_to_jiffies(up->uart_dma.rx_timeout));
> + }
> + up->port_activity = jiffies;
> +}
> +
> +static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
> +{
> + return;
> +}
> +
> +static int serial_omap_start_rxdma(struct uart_omap_port *up)
> +{
> + int ret = 0;
> +
> + if (up->uart_dma.rx_dma_channel == -1) {
> + ret = omap_request_dma(up->uart_dma.uart_dma_rx,
> + "UART Rx DMA",
> + (void *)uart_rx_dma_callback, up,
> + &(up->uart_dma.rx_dma_channel));
> + if (ret < 0)
> + return ret;
> +
> + omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
> + OMAP_DMA_AMODE_CONSTANT,
> + up->uart_dma.uart_base, 0, 0);
> + omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
> + OMAP_DMA_AMODE_POST_INC,
> + up->uart_dma.rx_buf_dma_phys, 0, 0);
> + omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
> + OMAP_DMA_DATA_TYPE_S8,
> + up->uart_dma.rx_buf_size, 1,
> + OMAP_DMA_SYNC_ELEMENT,
> + up->uart_dma.uart_dma_rx, 0);
> + }
> + up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
> + /* FIXME: Cache maintenance needed here? */
> + omap_start_dma(up->uart_dma.rx_dma_channel);
> + mod_timer(&up->uart_dma.rx_timer, jiffies +
> + usecs_to_jiffies(up->uart_dma.rx_timeout));
> + up->uart_dma.rx_dma_used = true;
> + return ret;
> +}
> +
> +static void serial_omap_continue_tx(struct uart_omap_port *up)
> +{
> + struct circ_buf *xmit = &up->port.state->xmit;
> + int start = up->uart_dma.tx_buf_dma_phys
> + + (xmit->tail & (UART_XMIT_SIZE - 1));
> +
> + if (uart_circ_empty(xmit))
> + return;
> +
> + up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
> + /*
> + * It is a circular buffer. See if the buffer has wounded back.
> + * If yes it will have to be transferred in two separate dma
> + * transfers
> + */
> + if (start + up->uart_dma.tx_buf_size >=
> + up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
> + up->uart_dma.tx_buf_size =
> + (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
> + omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
> + OMAP_DMA_AMODE_CONSTANT,
> + up->uart_dma.uart_base, 0, 0);
> + omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
> + OMAP_DMA_AMODE_POST_INC, start, 0, 0);
> + omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
> + OMAP_DMA_DATA_TYPE_S8,
> + up->uart_dma.tx_buf_size, 1,
> + OMAP_DMA_SYNC_ELEMENT,
> + up->uart_dma.uart_dma_tx, 0);
> + /* FIXME: Cache maintenance needed here? */
> + omap_start_dma(up->uart_dma.tx_dma_channel);
> +}
> +
> +static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
> +{
> + struct uart_omap_port *up = (struct uart_omap_port *)data;
> + struct circ_buf *xmit = &up->port.state->xmit;
> +
> + xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
> + (UART_XMIT_SIZE - 1);
> + up->port.icount.tx += up->uart_dma.tx_buf_size;
> +
> + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> + uart_write_wakeup(&up->port);
> +
> + if (uart_circ_empty(xmit)) {
> + spin_lock(&(up->uart_dma.tx_lock));
> + serial_omap_stop_tx(&up->port);
> + up->uart_dma.tx_dma_used = false;
> + spin_unlock(&(up->uart_dma.tx_lock));
> + } else {
> + omap_stop_dma(up->uart_dma.tx_dma_channel);
> + serial_omap_continue_tx(up);
> + }
> + up->port_activity = jiffies;
> + return;
> +}
> +
> +static int serial_omap_probe(struct platform_device *pdev)
> +{
> + struct uart_omap_port *up;
> + struct resource *mem, *irq, *dma_tx, *dma_rx;
> + struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
> + int ret = -ENOSPC;
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem) {
> + dev_err(&pdev->dev, "no mem resource?\n");
> + return -ENODEV;
> + }
> + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> + if (!irq) {
> + dev_err(&pdev->dev, "no irq resource?\n");
> + return -ENODEV;
> + }
> +
> + if (!request_mem_region(mem->start, (mem->end - mem->start) + 1,
> + pdev->dev.driver->name)) {
> + dev_err(&pdev->dev, "memory region already claimed\n");
> + return -EBUSY;
> + }
> +
> + dma_tx = platform_get_resource(pdev, IORESOURCE_DMA, 0);
> + if (!dma_tx) {
> + ret = -EINVAL;
> + goto err;
> + }
> +
> + dma_rx = platform_get_resource(pdev, IORESOURCE_DMA, 1);
> + if (!dma_rx) {
> + ret = -EINVAL;
> + goto err;
> + }
> +
> + up = kzalloc(sizeof(*up), GFP_KERNEL);
> + if (up == NULL) {
> + ret = -ENOMEM;
> + goto do_release_region;
> + }
> + sprintf(up->name, "OMAP UART%d", pdev->id);
> + up->pdev = pdev;
> + up->port.dev = &pdev->dev;
> + up->port.type = PORT_OMAP;
> + up->port.iotype = UPIO_MEM;
> + up->port.irq = irq->start;
> + if (cpu_is_omap44xx())
> + up->port.irq += 32;
> +
> + up->port.regshift = 2;
> + up->port.fifosize = 64;
> + up->port.ops = &serial_omap_pops;
> + up->port.line = pdev->id;
> +
> + up->port.membase = omap_up_info->membase;
> + up->port.mapbase = omap_up_info->mapbase;
> + up->port.flags = omap_up_info->flags;
> + up->port.irqflags = omap_up_info->irqflags;
> + up->port.uartclk = omap_up_info->uartclk;
> + up->uart_dma.uart_base = mem->start;
> +
> + if (omap_up_info->dma_enabled) {
> + up->uart_dma.uart_dma_tx = dma_tx->start;
> + up->uart_dma.uart_dma_rx = dma_rx->start;
> + up->use_dma = 1;
> + up->uart_dma.rx_buf_size = 4096;
> + up->uart_dma.rx_timeout = 1;
> + spin_lock_init(&(up->uart_dma.tx_lock));
> + spin_lock_init(&(up->uart_dma.rx_lock));
> + up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
> + up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
> + }
> +
> + ui[pdev->id] = up;
> + serial_omap_add_console_port(up);
> +
> + ret = uart_add_one_port(&serial_omap_reg, &up->port);
> + if (ret != 0)
> + goto do_release_region;
> +
> + platform_set_drvdata(pdev, up);
> + return 0;
> +err:
> + dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
> + pdev->id, __func__, ret);
> +do_release_region:
> + release_mem_region(mem->start, (mem->end - mem->start) + 1);
> + return ret;
> +}
> +
> +static int serial_omap_remove(struct platform_device *dev)
> +{
> + struct uart_omap_port *up = platform_get_drvdata(dev);
> +
> + platform_set_drvdata(dev, NULL);
> + if (up) {
> + uart_remove_one_port(&serial_omap_reg, &up->port);
> + kfree(up);
> + }
> + return 0;
> +}
> +
> +static struct platform_driver serial_omap_driver = {
> + .probe = serial_omap_probe,
> + .remove = serial_omap_remove,
> +
> + .suspend = serial_omap_suspend,
> + .resume = serial_omap_resume,
> + .driver = {
> + .name = DRIVER_NAME,
> + },
> +};
> +
> +int __init serial_omap_init(void)
> +{
> + int ret;
> +
> + ret = uart_register_driver(&serial_omap_reg);
> + if (ret != 0)
> + return ret;
> + ret = platform_driver_register(&serial_omap_driver);
> + if (ret != 0)
> + uart_unregister_driver(&serial_omap_reg);
> + return ret;
> +}
> +
> +void __exit serial_omap_exit(void)
> +{
> + platform_driver_unregister(&serial_omap_driver);
> + uart_unregister_driver(&serial_omap_reg);
> +}
> +
> +module_init(serial_omap_init);
> +module_exit(serial_omap_exit);
> +
> +MODULE_DESCRIPTION("OMAP High Speed UART driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Texas Instruments Inc");
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 8c3dd36..e02b945 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -182,6 +182,9 @@
> /* Aeroflex Gaisler GRLIB APBUART */
> #define PORT_APBUART 90
>
> +/* TI OMAP-UART */
> +#define PORT_OMAP 91
> +
> #ifdef __KERNEL__
>
> #include <linux/compiler.h>
> --
> 1.6.3.3
>
>




\
 
 \ /
  Last update: 2010-03-11 14:17    [W:0.095 / U:5.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site