[PATCH] at91_serial -> atmel_serial: at91_serial.c

Rename at91_serial.c atmel_serial.c

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Acked-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 981 insertions, 0 deletions

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
new file mode 100644
index 000000000000..3b420aeafc24
--- /dev/null
+++ b/drivers/serial/atmel_serial.c
@@ -0,0 +1,981 @@
+/*
+ *  linux/drivers/char/at91_serial.c
+ *
+ *  Driver for Atmel AT91RM9200 Serial ports
+ *  Copyright (C) 2003 Rick Bronson
+ *
+ *  Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * 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.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/tty_flip.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+
+#include <asm/arch/at91rm9200_pdc.h>
+#include <asm/mach/serial_at91.h>
+#include <asm/arch/board.h>
+#include <asm/arch/system.h>
+#include <asm/arch/gpio.h>
+
+#include "atmel_serial.h"
+
+#if defined(CONFIG_SERIAL_AT91_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#ifdef CONFIG_SERIAL_AT91_TTYAT
+
+/* Use device name ttyAT, major 204 and minor 154-169.  This is necessary if we
+ * should coexist with the 8250 driver, such as if we have an external 16C550
+ * UART. */
+#define SERIAL_AT91_MAJOR       204
+#define MINOR_START             154
+#define AT91_DEVICENAME         "ttyAT"
+
+#else
+
+/* Use device name ttyS, major 4, minor 64-68.  This is the usual serial port
+ * name, but it is legally reserved for the 8250 driver. */
+#define SERIAL_AT91_MAJOR       TTY_MAJOR
+#define MINOR_START             64
+#define AT91_DEVICENAME         "ttyS"
+
+#endif
+
+#define AT91_ISR_PASS_LIMIT     256
+
+#define UART_PUT_CR(port,v)     writel(v, (port)->membase + AT91_US_CR)
+#define UART_GET_MR(port)       readl((port)->membase + AT91_US_MR)
+#define UART_PUT_MR(port,v)     writel(v, (port)->membase + AT91_US_MR)
+#define UART_PUT_IER(port,v)    writel(v, (port)->membase + AT91_US_IER)
+#define UART_PUT_IDR(port,v)    writel(v, (port)->membase + AT91_US_IDR)
+#define UART_GET_IMR(port)      readl((port)->membase + AT91_US_IMR)
+#define UART_GET_CSR(port)      readl((port)->membase + AT91_US_CSR)
+#define UART_GET_CHAR(port)     readl((port)->membase + AT91_US_RHR)
+#define UART_PUT_CHAR(port,v)   writel(v, (port)->membase + AT91_US_THR)
+#define UART_GET_BRGR(port)     readl((port)->membase + AT91_US_BRGR)
+#define UART_PUT_BRGR(port,v)   writel(v, (port)->membase + AT91_US_BRGR)
+#define UART_PUT_RTOR(port,v)   writel(v, (port)->membase + AT91_US_RTOR)
+
+// #define UART_GET_CR(port)    readl((port)->membase + AT91_US_CR)             // is write-only
+
+ /* PDC registers */
+#define UART_PUT_PTCR(port,v)   writel(v, (port)->membase + AT91_PDC_PTCR)
+#define UART_GET_PTSR(port)     readl((port)->membase + AT91_PDC_PTSR)
+
+#define UART_PUT_RPR(port,v)    writel(v, (port)->membase + AT91_PDC_RPR)
+#define UART_GET_RPR(port)      readl((port)->membase + AT91_PDC_RPR)
+#define UART_PUT_RCR(port,v)    writel(v, (port)->membase + AT91_PDC_RCR)
+#define UART_PUT_RNPR(port,v)   writel(v, (port)->membase + AT91_PDC_RNPR)
+#define UART_PUT_RNCR(port,v)   writel(v, (port)->membase + AT91_PDC_RNCR)
+
+#define UART_PUT_TPR(port,v)    writel(v, (port)->membase + AT91_PDC_TPR)
+#define UART_PUT_TCR(port,v)    writel(v, (port)->membase + AT91_PDC_TCR)
+//#define UART_PUT_TNPR(port,v) writel(v, (port)->membase + AT91_PDC_TNPR)
+//#define UART_PUT_TNCR(port,v) writel(v, (port)->membase + AT91_PDC_TNCR)
+
+static int (*at91_open)(struct uart_port *);
+static void (*at91_close)(struct uart_port *);
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct at91_uart_port {
+        struct uart_port        uart;           /* uart */
+        struct clk              *clk;           /* uart clock */
+        unsigned short          suspended;      /* is port suspended? */
+};
+
+static struct at91_uart_port at91_ports[AT91_NR_UART];
+
+#ifdef SUPPORT_SYSRQ
+static struct console at91_console;
+#endif
+
+/*
+ * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
+ */
+static u_int at91_tx_empty(struct uart_port *port)
+{
+        return (UART_GET_CSR(port) & AT91_US_TXEMPTY) ? TIOCSER_TEMT : 0;
+}
+
+/*
+ * Set state of the modem control output lines
+ */
+static void at91_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+        unsigned int control = 0;
+        unsigned int mode;
+
+        if (arch_identify() == ARCH_ID_AT91RM9200) {
+                /*
+                 * AT91RM9200 Errata #39: RTS0 is not internally connected to PA21.
+                 *  We need to drive the pin manually.
+                 */
+                if (port->mapbase == AT91RM9200_BASE_US0) {
+                        if (mctrl & TIOCM_RTS)
+                                at91_set_gpio_value(AT91_PIN_PA21, 0);
+                        else
+                                at91_set_gpio_value(AT91_PIN_PA21, 1);
+                }
+        }
+
+        if (mctrl & TIOCM_RTS)
+                control |= AT91_US_RTSEN;
+        else
+                control |= AT91_US_RTSDIS;
+
+        if (mctrl & TIOCM_DTR)
+                control |= AT91_US_DTREN;
+        else
+                control |= AT91_US_DTRDIS;
+
+        UART_PUT_CR(port, control);
+
+        /* Local loopback mode? */
+        mode = UART_GET_MR(port) & ~AT91_US_CHMODE;
+        if (mctrl & TIOCM_LOOP)
+                mode |= AT91_US_CHMODE_LOC_LOOP;
+        else
+                mode |= AT91_US_CHMODE_NORMAL;
+        UART_PUT_MR(port, mode);
+}
+
+/*
+ * Get state of the modem control input lines
+ */
+static u_int at91_get_mctrl(struct uart_port *port)
+{
+        unsigned int status, ret = 0;
+
+        status = UART_GET_CSR(port);
+
+        /*
+         * The control signals are active low.
+         */
+        if (!(status & AT91_US_DCD))
+                ret |= TIOCM_CD;
+        if (!(status & AT91_US_CTS))
+                ret |= TIOCM_CTS;
+        if (!(status & AT91_US_DSR))
+                ret |= TIOCM_DSR;
+        if (!(status & AT91_US_RI))
+                ret |= TIOCM_RI;
+
+        return ret;
+}
+
+/*
+ * Stop transmitting.
+ */
+static void at91_stop_tx(struct uart_port *port)
+{
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        UART_PUT_IDR(port, AT91_US_TXRDY);
+}
+
+/*
+ * Start transmitting.
+ */
+static void at91_start_tx(struct uart_port *port)
+{
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        UART_PUT_IER(port, AT91_US_TXRDY);
+}
+
+/*
+ * Stop receiving - port is in process of being closed.
+ */
+static void at91_stop_rx(struct uart_port *port)
+{
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        UART_PUT_IDR(port, AT91_US_RXRDY);
+}
+
+/*
+ * Enable modem status interrupts
+ */
+static void at91_enable_ms(struct uart_port *port)
+{
+        UART_PUT_IER(port, AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC);
+}
+
+/*
+ * Control the transmission of a break signal
+ */
+static void at91_break_ctl(struct uart_port *port, int break_state)
+{
+        if (break_state != 0)
+                UART_PUT_CR(port, AT91_US_STTBRK);      /* start break */
+        else
+                UART_PUT_CR(port, AT91_US_STPBRK);      /* stop break */
+}
+
+/*
+ * Characters received (called from interrupt handler)
+ */
+static void at91_rx_chars(struct uart_port *port, struct pt_regs *regs)
+{
+        struct tty_struct *tty = port->info->tty;
+        unsigned int status, ch, flg;
+
+        status = UART_GET_CSR(port);
+        while (status & AT91_US_RXRDY) {
+                ch = UART_GET_CHAR(port);
+
+                port->icount.rx++;
+
+                flg = TTY_NORMAL;
+
+                /*
+                 * note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (unlikely(status & (AT91_US_PARE | AT91_US_FRAME | AT91_US_OVRE | AT91_US_RXBRK))) {
+                        UART_PUT_CR(port, AT91_US_RSTSTA);      /* clear error */
+                        if (status & AT91_US_RXBRK) {
+                                status &= ~(AT91_US_PARE | AT91_US_FRAME);      /* ignore side-effect */
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        goto ignore_char;
+                        }
+                        if (status & AT91_US_PARE)
+                                port->icount.parity++;
+                        if (status & AT91_US_FRAME)
+                                port->icount.frame++;
+                        if (status & AT91_US_OVRE)
+                                port->icount.overrun++;
+
+                        status &= port->read_status_mask;
+
+                        if (status & AT91_US_RXBRK)
+                                flg = TTY_BREAK;
+                        else if (status & AT91_US_PARE)
+                                flg = TTY_PARITY;
+                        else if (status & AT91_US_FRAME)
+                                flg = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch, regs))
+                        goto ignore_char;
+
+                uart_insert_char(port, status, AT91_US_OVRE, ch, flg);
+
+        ignore_char:
+                status = UART_GET_CSR(port);
+        }
+
+        tty_flip_buffer_push(tty);
+}
+
+/*
+ * Transmit characters (called from interrupt handler)
+ */
+static void at91_tx_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->info->xmit;
+
+        if (port->x_char) {
+                UART_PUT_CHAR(port, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                at91_stop_tx(port);
+                return;
+        }
+
+        while (UART_GET_CSR(port) & AT91_US_TXRDY) {
+                UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                at91_stop_tx(port);
+}
+
+/*
+ * Interrupt handler
+ */
+static irqreturn_t at91_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct uart_port *port = dev_id;
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+        unsigned int status, pending, pass_counter = 0;
+
+        status = UART_GET_CSR(port);
+        pending = status & UART_GET_IMR(port);
+        while (pending) {
+                /* Interrupt receive */
+                if (pending & AT91_US_RXRDY)
+                        at91_rx_chars(port, regs);
+
+                // TODO: All reads to CSR will clear these interrupts!
+                if (pending & AT91_US_RIIC) port->icount.rng++;
+                if (pending & AT91_US_DSRIC) port->icount.dsr++;
+                if (pending & AT91_US_DCDIC)
+                        uart_handle_dcd_change(port, !(status & AT91_US_DCD));
+                if (pending & AT91_US_CTSIC)
+                        uart_handle_cts_change(port, !(status & AT91_US_CTS));
+                if (pending & (AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC))
+                        wake_up_interruptible(&port->info->delta_msr_wait);
+
+                /* Interrupt transmit */
+                if (pending & AT91_US_TXRDY)
+                        at91_tx_chars(port);
+
+                if (pass_counter++ > AT91_ISR_PASS_LIMIT)
+                        break;
+
+                status = UART_GET_CSR(port);
+                pending = status & UART_GET_IMR(port);
+        }
+        return IRQ_HANDLED;
+}
+
+/*
+ * Perform initialization and enable port for reception
+ */
+static int at91_startup(struct uart_port *port)
+{
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+        int retval;
+
+        /*
+         * Ensure that no interrupts are enabled otherwise when
+         * request_irq() is called we could get stuck trying to
+         * handle an unexpected interrupt
+         */
+        UART_PUT_IDR(port, -1);
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(port->irq, at91_interrupt, IRQF_SHARED, "at91_serial", port);
+        if (retval) {
+                printk("at91_serial: at91_startup - Can't get irq\n");
+                return retval;
+        }
+
+        /*
+         * If there is a specific "open" function (to register
+         * control line interrupts)
+         */
+        if (at91_open) {
+                retval = at91_open(port);
+                if (retval) {
+                        free_irq(port->irq, port);
+                        return retval;
+                }
+        }
+
+        /*
+         * Finally, enable the serial port
+         */
+        UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX);
+        UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN);         /* enable xmit & rcvr */
+
+        UART_PUT_IER(port, AT91_US_RXRDY);              /* enable receive only */
+
+        return 0;
+}
+
+/*
+ * Disable the port
+ */
+static void at91_shutdown(struct uart_port *port)
+{
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        /*
+         * Disable all interrupts, port and break condition.
+         */
+        UART_PUT_CR(port, AT91_US_RSTSTA);
+        UART_PUT_IDR(port, -1);
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(port->irq, port);
+
+        /*
+         * If there is a specific "close" function (to unregister
+         * control line interrupts)
+         */
+        if (at91_close)
+                at91_close(port);
+}
+
+/*
+ * Power / Clock management.
+ */
+static void at91_serial_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
+{
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        switch (state) {
+                case 0:
+                        /*
+                         * Enable the peripheral clock for this serial port.
+                         * This is called on uart_open() or a resume event.
+                         */
+                        clk_enable(at91_port->clk);
+                        break;
+                case 3:
+                        /*
+                         * Disable the peripheral clock for this serial port.
+                         * This is called on uart_close() or a suspend event.
+                         */
+                        clk_disable(at91_port->clk);
+                        break;
+                default:
+                        printk(KERN_ERR "at91_serial: unknown pm %d\n", state);
+        }
+}
+
+/*
+ * Change the port parameters
+ */
+static void at91_set_termios(struct uart_port *port, struct termios * termios, struct termios * old)
+{
+        unsigned long flags;
+        unsigned int mode, imr, quot, baud;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+        quot = uart_get_divisor(port, baud);
+
+        /* Get current mode register */
+        mode = UART_GET_MR(port) & ~(AT91_US_CHRL | AT91_US_NBSTOP | AT91_US_PAR);
+
+        /* byte size */
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                mode |= AT91_US_CHRL_5;
+                break;
+        case CS6:
+                mode |= AT91_US_CHRL_6;
+                break;
+        case CS7:
+                mode |= AT91_US_CHRL_7;
+                break;
+        default:
+                mode |= AT91_US_CHRL_8;
+                break;
+        }
+
+        /* stop bits */
+        if (termios->c_cflag & CSTOPB)
+                mode |= AT91_US_NBSTOP_2;
+
+        /* parity */
+        if (termios->c_cflag & PARENB) {
+                if (termios->c_cflag & CMSPAR) {                        /* Mark or Space parity */
+                        if (termios->c_cflag & PARODD)
+                                mode |= AT91_US_PAR_MARK;
+                        else
+                                mode |= AT91_US_PAR_SPACE;
+                }
+                else if (termios->c_cflag & PARODD)
+                        mode |= AT91_US_PAR_ODD;
+                else
+                        mode |= AT91_US_PAR_EVEN;
+        }
+        else
+                mode |= AT91_US_PAR_NONE;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        port->read_status_mask = AT91_US_OVRE;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= (AT91_US_FRAME | AT91_US_PARE);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= AT91_US_RXBRK;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= (AT91_US_FRAME | AT91_US_PARE);
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= AT91_US_RXBRK;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= AT91_US_OVRE;
+        }
+
+        // TODO: Ignore all characters if CREAD is set.
+
+        /* update the per-port timeout */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /* disable interrupts and drain transmitter */
+        imr = UART_GET_IMR(port);       /* get interrupt mask */
+        UART_PUT_IDR(port, -1);         /* disable all interrupts */
+        while (!(UART_GET_CSR(port) & AT91_US_TXEMPTY)) { barrier(); }
+
+        /* disable receiver and transmitter */
+        UART_PUT_CR(port, AT91_US_TXDIS | AT91_US_RXDIS);
+
+        /* set the parity, stop bits and data size */
+        UART_PUT_MR(port, mode);
+
+        /* set the baud rate */
+        UART_PUT_BRGR(port, quot);
+        UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX);
+        UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN);
+
+        /* restore interrupts */
+        UART_PUT_IER(port, imr);
+
+        /* CTS flow-control and modem-status interrupts */
+        if (UART_ENABLE_MS(port, termios->c_cflag))
+                port->ops->enable_ms(port);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*
+ * Return string describing the specified port
+ */
+static const char *at91_type(struct uart_port *port)
+{
+        return (port->type == PORT_AT91) ? "AT91_SERIAL" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void at91_release_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        int size = pdev->resource[0].end - pdev->resource[0].start + 1;
+
+        release_mem_region(port->mapbase, size);
+
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int at91_request_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        int size = pdev->resource[0].end - pdev->resource[0].start + 1;
+
+        if (!request_mem_region(port->mapbase, size, "at91_serial"))
+                return -EBUSY;
+
+        if (port->flags & UPF_IOREMAP) {
+                port->membase = ioremap(port->mapbase, size);
+                if (port->membase == NULL) {
+                        release_mem_region(port->mapbase, size);
+                        return -ENOMEM;
+                }
+        }
+
+        return 0;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void at91_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_AT91;
+                at91_request_port(port);
+        }
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int at91_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_AT91)
+                ret = -EINVAL;
+        if (port->irq != ser->irq)
+                ret = -EINVAL;
+        if (ser->io_type != SERIAL_IO_MEM)
+                ret = -EINVAL;
+        if (port->uartclk / 16 != ser->baud_base)
+                ret = -EINVAL;
+        if ((void *)port->mapbase != ser->iomem_base)
+                ret = -EINVAL;
+        if (port->iobase != ser->port)
+                ret = -EINVAL;
+        if (ser->hub6 != 0)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops at91_pops = {
+        .tx_empty       = at91_tx_empty,
+        .set_mctrl      = at91_set_mctrl,
+        .get_mctrl      = at91_get_mctrl,
+        .stop_tx        = at91_stop_tx,
+        .start_tx       = at91_start_tx,
+        .stop_rx        = at91_stop_rx,
+        .enable_ms      = at91_enable_ms,
+        .break_ctl      = at91_break_ctl,
+        .startup        = at91_startup,
+        .shutdown       = at91_shutdown,
+        .set_termios    = at91_set_termios,
+        .type           = at91_type,
+        .release_port   = at91_release_port,
+        .request_port   = at91_request_port,
+        .config_port    = at91_config_port,
+        .verify_port    = at91_verify_port,
+        .pm             = at91_serial_pm,
+};
+
+/*
+ * Configure the port from the platform device resource info.
+ */
+static void __devinit at91_init_port(struct at91_uart_port *at91_port, struct platform_device *pdev)
+{
+        struct uart_port *port = &at91_port->uart;
+        struct at91_uart_data *data = pdev->dev.platform_data;
+
+        port->iotype    = UPIO_MEM;
+        port->flags     = UPF_BOOT_AUTOCONF;
+        port->ops       = &at91_pops;
+        port->fifosize  = 1;
+        port->line      = pdev->id;
+        port->dev       = &pdev->dev;
+
+        port->mapbase   = pdev->resource[0].start;
+        port->irq       = pdev->resource[1].start;
+
+        if (port->mapbase == AT91_VA_BASE_SYS + AT91_DBGU)              /* Part of system perpherals - already mapped */
+                port->membase = (void __iomem *) port->mapbase;
+        else {
+                port->flags     |= UPF_IOREMAP;
+                port->membase   = NULL;
+        }
+
+        if (!at91_port->clk) {          /* for console, the clock could already be configured */
+                at91_port->clk = clk_get(&pdev->dev, "usart");
+                clk_enable(at91_port->clk);
+                port->uartclk = clk_get_rate(at91_port->clk);
+        }
+}
+
+/*
+ * Register board-specific modem-control line handlers.
+ */
+void __init at91_register_uart_fns(struct at91_port_fns *fns)
+{
+        if (fns->enable_ms)
+                at91_pops.enable_ms = fns->enable_ms;
+        if (fns->get_mctrl)
+                at91_pops.get_mctrl = fns->get_mctrl;
+        if (fns->set_mctrl)
+                at91_pops.set_mctrl = fns->set_mctrl;
+        at91_open          = fns->open;
+        at91_close         = fns->close;
+        at91_pops.pm       = fns->pm;
+        at91_pops.set_wake = fns->set_wake;
+}
+
+
+#ifdef CONFIG_SERIAL_AT91_CONSOLE
+static void at91_console_putchar(struct uart_port *port, int ch)
+{
+        while (!(UART_GET_CSR(port) & AT91_US_TXRDY))
+                barrier();
+        UART_PUT_CHAR(port, ch);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void at91_console_write(struct console *co, const char *s, u_int count)
+{
+        struct uart_port *port = &at91_ports[co->index].uart;
+        unsigned int status, imr;
+
+        /*
+         *      First, save IMR and then disable interrupts
+         */
+        imr = UART_GET_IMR(port);       /* get interrupt mask */
+        UART_PUT_IDR(port, AT91_US_RXRDY | AT91_US_TXRDY);
+
+        uart_console_write(port, s, count, at91_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore IMR
+         */
+        do {
+                status = UART_GET_CSR(port);
+        } while (!(status & AT91_US_TXRDY));
+        UART_PUT_IER(port, imr);        /* set interrupts back the way they were */
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader), try to determine
+ * the current setup.
+ */
+static void __init at91_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
+{
+        unsigned int mr, quot;
+
+// TODO: CR is a write-only register
+//      unsigned int cr;
+//
+//      cr = UART_GET_CR(port) & (AT91_US_RXEN | AT91_US_TXEN);
+//      if (cr == (AT91_US_RXEN | AT91_US_TXEN)) {
+//              /* ok, the port was enabled */
+//      }
+
+        mr = UART_GET_MR(port) & AT91_US_CHRL;
+        if (mr == AT91_US_CHRL_8)
+                *bits = 8;
+        else
+                *bits = 7;
+
+        mr = UART_GET_MR(port) & AT91_US_PAR;
+        if (mr == AT91_US_PAR_EVEN)
+                *parity = 'e';
+        else if (mr == AT91_US_PAR_ODD)
+                *parity = 'o';
+
+        quot = UART_GET_BRGR(port);
+        *baud = port->uartclk / (16 * (quot));
+}
+
+static int __init at91_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port = &at91_ports[co->index].uart;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (port->membase == 0)         /* Port not initialized yet - delay setup */
+                return -ENODEV;
+
+        UART_PUT_IDR(port, -1);                         /* disable interrupts */
+        UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX);
+        UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                at91_console_get_options(port, &baud, &parity, &bits);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver at91_uart;
+
+static struct console at91_console = {
+        .name           = AT91_DEVICENAME,
+        .write          = at91_console_write,
+        .device         = uart_console_device,
+        .setup          = at91_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &at91_uart,
+};
+
+#define AT91_CONSOLE_DEVICE     &at91_console
+
+/*
+ * Early console initialization (before VM subsystem initialized).
+ */
+static int __init at91_console_init(void)
+{
+        if (at91_default_console_device) {
+                add_preferred_console(AT91_DEVICENAME, at91_default_console_device->id, NULL);
+                at91_init_port(&(at91_ports[at91_default_console_device->id]), at91_default_console_device);
+                register_console(&at91_console);
+        }
+
+        return 0;
+}
+console_initcall(at91_console_init);
+
+/*
+ * Late console initialization.
+ */
+static int __init at91_late_console_init(void)
+{
+        if (at91_default_console_device && !(at91_console.flags & CON_ENABLED))
+                register_console(&at91_console);
+
+        return 0;
+}
+core_initcall(at91_late_console_init);
+
+#else
+#define AT91_CONSOLE_DEVICE     NULL
+#endif
+
+static struct uart_driver at91_uart = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "at91_serial",
+        .dev_name               = AT91_DEVICENAME,
+        .major                  = SERIAL_AT91_MAJOR,
+        .minor                  = MINOR_START,
+        .nr                     = AT91_NR_UART,
+        .cons                   = AT91_CONSOLE_DEVICE,
+};
+
+#ifdef CONFIG_PM
+static int at91_serial_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct uart_port *port = platform_get_drvdata(pdev);
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        if (device_may_wakeup(&pdev->dev) && !at91_suspend_entering_slow_clock())
+                enable_irq_wake(port->irq);
+        else {
+                disable_irq_wake(port->irq);
+                uart_suspend_port(&at91_uart, port);
+                at91_port->suspended = 1;
+        }
+
+        return 0;
+}
+
+static int at91_serial_resume(struct platform_device *pdev)
+{
+        struct uart_port *port = platform_get_drvdata(pdev);
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+
+        if (at91_port->suspended) {
+                uart_resume_port(&at91_uart, port);
+                at91_port->suspended = 0;
+        }
+
+        return 0;
+}
+#else
+#define at91_serial_suspend NULL
+#define at91_serial_resume NULL
+#endif
+
+static int __devinit at91_serial_probe(struct platform_device *pdev)
+{
+        struct at91_uart_port *port;
+        int ret;
+
+        port = &at91_ports[pdev->id];
+        at91_init_port(port, pdev);
+
+        ret = uart_add_one_port(&at91_uart, &port->uart);
+        if (!ret) {
+                device_init_wakeup(&pdev->dev, 1);
+                platform_set_drvdata(pdev, port);
+        }
+
+        return ret;
+}
+
+static int __devexit at91_serial_remove(struct platform_device *pdev)
+{
+        struct uart_port *port = platform_get_drvdata(pdev);
+        struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
+        int ret = 0;
+
+        clk_disable(at91_port->clk);
+        clk_put(at91_port->clk);
+
+        device_init_wakeup(&pdev->dev, 0);
+        platform_set_drvdata(pdev, NULL);
+
+        if (port) {
+                ret = uart_remove_one_port(&at91_uart, port);
+                kfree(port);
+        }
+
+        return ret;
+}
+
+static struct platform_driver at91_serial_driver = {
+        .probe          = at91_serial_probe,
+        .remove         = __devexit_p(at91_serial_remove),
+        .suspend        = at91_serial_suspend,
+        .resume         = at91_serial_resume,
+        .driver         = {
+                .name   = "at91_usart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init at91_serial_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&at91_uart);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&at91_serial_driver);
+        if (ret)
+                uart_unregister_driver(&at91_uart);
+
+        return ret;
+}
+
+static void __exit at91_serial_exit(void)
+{
+        platform_driver_unregister(&at91_serial_driver);
+        uart_unregister_driver(&at91_uart);
+}
+
+module_init(at91_serial_init);
+module_exit(at91_serial_exit);
+
+MODULE_AUTHOR("Rick Bronson");
+MODULE_DESCRIPTION("AT91 generic serial port driver");
+MODULE_LICENSE("GPL");