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openwrt-owl/target/linux/ubicom32/files/drivers/serial/ubi32_uarttio.c

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/*
* drivers/serial/ubi32_uarttio.c
* Ubicom32 Serial Virtual Peripherial Driver
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port 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.
*
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*/
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <asm/ip5000.h>
#include <asm/gpio.h>
#include <asm/thread.h>
#include <asm/uart_tio.h>
#define DRIVER_NAME "ubi32_uarttio"
/*
* For storing the module parameters.
*/
#define UBI32_UARTTIO_MAX_PARAM_LEN 80
static char utio_ports_param[UBI32_UARTTIO_MAX_PARAM_LEN];
/*
* UART name and device definitions
*/
#define UBI32_UARTTIO_NAME "ttyUV" // XXX
#define UBI32_UARTTIO_MAJOR 206 // XXX
#define UBI32_UARTTIO_MINOR 64 // XXX
/*
* The following structures are allocated statically because the
* memory allocation subsystem is not initialized this early on
*/
/*
* Per port structure
*/
struct ubi32_uarttio_port {
struct uarttio_uart *uart;
unsigned int tx_pin;
unsigned int rx_pin;
struct uart_port port;
u8_t added;
/*
* If this value is set, the port has had its direction set already
*/
u8_t port_init;
};
static struct ubi32_uarttio_port uarttio_ports[CONFIG_SERIAL_UBI32_UARTTIO_NR_UARTS];
/*
* Number of ports currently initialized
*/
static int uarttio_nports;
/*
* Per device structure
*/
struct ubi32_uarttio_instance {
struct uarttio_regs *regs;
struct ubi32_uarttio_port *ports;
u8_t irq_requested;
u8_t driver_registered;
u8_t irq;
};
static struct ubi32_uarttio_instance uarttio_inst;
#ifdef CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE
static struct console ubi32_uarttio_console;
#define UBI32_UARTTIO_CONSOLE &ubi32_uarttio_console
#else
#define UBI32_UARTTIO_CONSOLE NULL
#endif
static struct uart_driver ubi32_uarttio_uart_driver = {
.owner = THIS_MODULE,
.driver_name = DRIVER_NAME,
.dev_name = UBI32_UARTTIO_NAME,
.major = UBI32_UARTTIO_MAJOR,
.minor = UBI32_UARTTIO_MINOR,
.cons = UBI32_UARTTIO_CONSOLE,
};
#ifdef UBI32_UARTTIO_UNUSED
/*
* ubi32_uarttio_get_send_space
*/
static int ubi32_uarttio_get_send_space(struct uarttio_uart *uart)
{
int count = uart->tx_fifo_head - uart->tx_fifo_tail;
if (count < 0) {
count += uart->tx_fifo_size;
}
return uart->tx_fifo_size - count;
}
#endif
/*
* ubi32_uarttio_get_recv_ready
*/
static int ubi32_uarttio_get_recv_ready(struct uarttio_uart *uart)
{
int count = uart->rx_fifo_head - uart->rx_fifo_tail;
if (count < 0) {
count += uart->rx_fifo_size;
}
return count;
}
/*
* ubi32_uarttio_get_char()
*/
static u8_t ubi32_uarttio_get_char(struct uarttio_uart *uart)
{
/*
* Retrieve byte
*/
u32_t tail = uart->rx_fifo_tail;
u8_t data = uart->rx_fifo[tail];
if (++tail == uart->rx_fifo_size) {
tail = 0;
}
uart->rx_fifo_tail = tail;
return data;
}
/*
* ubi32_uarttio_put_char()
*/
static int ubi32_uarttio_put_char(struct uarttio_uart *uart, u8_t c)
{
u32_t head = uart->tx_fifo_head;
u32_t prev = head;
/*
* Wrap
*/
if (++head == uart->tx_fifo_size) {
head = 0;
}
/*
* If there isn't any space, return EBUSY
*/
if (head == uart->tx_fifo_tail) {
return -EBUSY;
}
/*
* Put the character in the queue
*/
uart->tx_fifo[prev] = c;
uart->tx_fifo_head = head;
return 0;
}
/*
* ubi32_uarttio_set_baud
*/
static int ubi32_uarttio_set_baud(struct ubi32_uarttio_port *uup, unsigned int baud)
{
if (uup->uart->current_baud_rate == baud) {
return 0;
}
uup->uart->baud_rate = baud;
uup->uart->flags |= UARTTIO_UART_FLAG_SET_RATE;
while (uup->uart->flags & UARTTIO_UART_FLAG_SET_RATE) {
cpu_relax();
}
if (uup->uart->current_baud_rate != baud) {
/*
* Failed to set baud rate
*/
printk(KERN_WARNING "Invalid baud rate %u, running at %u\n", baud, uup->uart->current_baud_rate);
return -EINVAL;
}
return 0;
}
/*
* ubi32_uarttio_handle_receive
*/
static void ubi32_uarttio_handle_receive(struct ubi32_uarttio_port *uup, int stat)
{
struct uarttio_uart *uart = uup->uart;
struct uart_port *port = &uup->port;
struct tty_struct *tty = port->info->port.tty;
unsigned char ch = 0;
char flag = TTY_NORMAL;
int count;
if ((stat & (UARTTIO_UART_INT_RX | UARTTIO_UART_INT_RXFRAME | UARTTIO_UART_INT_RXOVF)) == 0) {
return;
}
if (stat & UARTTIO_UART_INT_RX) {
count = ubi32_uarttio_get_recv_ready(uart);
port->icount.rx += count;
}
if (stat & UARTTIO_UART_INT_RXOVF) {
port->icount.overrun++;
}
if (stat & UARTTIO_UART_INT_RXFRAME) {
port->icount.frame++;
}
stat &= ~port->ignore_status_mask;
if (stat & UARTTIO_UART_INT_RX) {
int i;
for (i = 0; i < count; i++) {
ch = ubi32_uarttio_get_char(uart);
tty_insert_flip_char(tty, ch, flag);
}
}
if (stat & UARTTIO_UART_INT_RXFRAME) {
tty_insert_flip_char(tty, 0, TTY_FRAME);
}
if (stat & UARTTIO_UART_INT_RXOVF) {
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
}
/*
* ubi32_uarttio_stop_tx
* interrupts are disabled on entry
*/
static void ubi32_uarttio_stop_tx(struct uart_port *port)
{
struct ubi32_uarttio_port *uup = port->private_data;
uup->uart->int_mask &= ~UARTTIO_UART_INT_TXBE;
}
/*
* ubi32_uarttio_handle_transmit
*/
static void ubi32_uarttio_handle_transmit(struct ubi32_uarttio_port *uup, int stat)
{
struct uarttio_uart *uart = uup->uart;
struct uart_port *port = &uup->port;
struct circ_buf *xmit = &port->info->xmit;
if (!(stat & UARTTIO_UART_INT_TXBE)) {
return;
}
if (port->x_char) {
if (ubi32_uarttio_put_char(uart, port->x_char)) {
return;
}
port->x_char = 0;
port->icount.tx++;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
ubi32_uarttio_stop_tx(port);
return;
}
/*
* Send as many characters as we can
*/
while (ubi32_uarttio_put_char(uart, xmit->buf[xmit->tail]) == 0) {
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit)) {
break;
}
}
/* wake up */
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
uart_write_wakeup(port);
}
if (uart_circ_empty(xmit)) {
ubi32_uarttio_stop_tx(port);
}
}
/*
* ubi32_uarttio_start_tx
* port is locked and interrupts are disabled
*/
static void ubi32_uarttio_start_tx(struct uart_port *port)
{
struct ubi32_uarttio_port *uup = port->private_data;
struct uarttio_uart *uart = uup->uart;
uart->int_mask |= UARTTIO_UART_INT_TXBE;
}
/*
* ubi32_uarttio_stop_rx
* Interrupts are enabled
*/
static void ubi32_uarttio_stop_rx(struct uart_port *port)
{
struct ubi32_uarttio_port *uup = port->private_data;
struct uarttio_uart *uart = uup->uart;
/*
* don't forward any more data (like !CREAD)
*/
uart->int_mask &= ~UARTTIO_UART_INT_RX;
port->ignore_status_mask = UARTTIO_UART_INT_RX;
}
/*
* ubi32_uarttio_enable_ms
* Set the modem control timer to fire immediately.
*/
static void ubi32_uarttio_enable_ms(struct uart_port *port)
{
/* N/A */
}
/*
* ubi32_uarttio_isr
*/
static irqreturn_t ubi32_uarttio_isr(int irq, void *appdata)
{
struct ubi32_uarttio_port *uup = uarttio_ports;
int i;
/*
* Service all of the ports
*/
for (i = 0; i < uarttio_nports; i++) {
unsigned int flags;
if (!(uup->uart->flags & UARTTIO_UART_FLAG_ENABLED)) {
uup++;
continue;
}
spin_lock(&uup->port.lock);
flags = uup->uart->int_flags;
uup->uart->int_flags = 0;
ubi32_uarttio_handle_receive(uup, flags);
ubi32_uarttio_handle_transmit(uup, flags);
tty_flip_buffer_push(uup->port.info->port.tty);
spin_unlock(&uup->port.lock);
uup++;
}
return IRQ_HANDLED;
}
/*
* ubi32_uarttio_tx_empty
* Return TIOCSER_TEMT when transmitter is not busy.
*/
static unsigned int ubi32_uarttio_tx_empty(struct uart_port *port)
{
struct ubi32_uarttio_port *uup = port->private_data;
if (uup->uart->tx_fifo_head == uup->uart->tx_fifo_tail) {
return TIOCSER_TEMT;
}
return 0;
}
/*
* ubi32_uarttio_get_mctrl
*/
static unsigned int ubi32_uarttio_get_mctrl(struct uart_port *port)
{
return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
}
/*
* ubi32_uarttio_set_mctrl
*/
static void ubi32_uarttio_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* N/A */
}
/*
* ubi32_uarttio_break_ctl
*/
static void ubi32_uarttio_break_ctl(struct uart_port *port, int break_state)
{
/* N/A */
}
/*
* ubi32_uarttio_startup
*/
static int ubi32_uarttio_startup(struct uart_port *port)
{
struct ubi32_uarttio_port *uup = port->private_data;
struct uarttio_uart *uart = uup->uart;
uart->flags |= UARTTIO_UART_FLAG_ENABLED;
uart->int_mask |= UARTTIO_UART_INT_TXBE | UARTTIO_UART_INT_RX;
return 0;
}
/*
* ubi32_uarttio_shutdown
*/
static void ubi32_uarttio_shutdown(struct uart_port *port)
{
struct ubi32_uarttio_port *uup = port->private_data;
struct uarttio_uart *uart = uup->uart;
uart->int_mask = 0;
uart->flags &= ~UARTTIO_UART_FLAG_ENABLED;
}
/*
* ubi32_uarttio_set_termios
*/
static void ubi32_uarttio_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old)
{
struct ubi32_uarttio_port *uup = port->private_data;
unsigned long flags;
unsigned int baud;
spin_lock_irqsave(&port->lock, flags);
#if 0
port->read_status_mask = UBI32_UARTTIO_RX | UBI32_UARTTIO_RXOVF | UBI32_UARTTIO_TXOVF;
if (termios->c_iflag & INPCK) {
port->read_status_mask |= UBI32_UARTTIO_RXFRAME;
}
#endif
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR) {
port->ignore_status_mask |= UARTTIO_UART_INT_RXFRAME |
UARTTIO_UART_INT_RXOVF;
}
/*
* ignore all characters if CREAD is not set
*/
if ((termios->c_cflag & CREAD) == 0) {
port->ignore_status_mask |= UARTTIO_UART_INT_RX |
UARTTIO_UART_INT_RXFRAME |
UARTTIO_UART_INT_RXOVF;
}
/* update timeout */
baud = uart_get_baud_rate(port, termios, old, 0, 460800);
uart_update_timeout(port, termios->c_cflag, baud);
ubi32_uarttio_set_baud(uup, baud);
spin_unlock_irqrestore(&port->lock, flags);
}
/*
* ubi32_uarttio_type
*/
static const char *ubi32_uarttio_type(struct uart_port *port)
{
return (port->type == PORT_UBI32_UARTTIO) ? "UBI32_UARTTIO" : NULL;
}
/*
* ubi32_uarttio_release_port
* Release the memory region(s) being used by 'port'.
*/
static void ubi32_uarttio_release_port(struct uart_port *port)
{
}
/*
* ubi32_uarttio_request_port
* Request the memory region(s) being used by 'port'.
*/
static int ubi32_uarttio_request_port(struct uart_port *port)
{
return 0;
}
/*
* ubi32_uarttio_config_port
* Configure/autoconfigure the port.
*/
static void ubi32_uarttio_config_port(struct uart_port *port, int flags)
{
if ((flags & UART_CONFIG_TYPE) && (ubi32_uarttio_request_port(port) == 0)) {
port->type = PORT_UBI32_UARTTIO;
}
}
/*
* ubi32_uarttio_verify_port
* Verify the new serial_struct (for TIOCSSERIAL).
*
* The only change we allow are to the flags and type, and
* even then only between PORT_UBI32_UARTTIO and PORT_UNKNOWN
*/
static int ubi32_uarttio_verify_port(struct uart_port *port, struct serial_struct *ser)
{
return 0;
}
static struct uart_ops ubi32_uarttio_pops = {
.tx_empty = ubi32_uarttio_tx_empty,
.set_mctrl = ubi32_uarttio_set_mctrl,
.get_mctrl = ubi32_uarttio_get_mctrl,
.stop_tx = ubi32_uarttio_stop_tx,
.start_tx = ubi32_uarttio_start_tx,
.stop_rx = ubi32_uarttio_stop_rx,
.enable_ms = ubi32_uarttio_enable_ms,
.break_ctl = ubi32_uarttio_break_ctl,
.startup = ubi32_uarttio_startup,
.shutdown = ubi32_uarttio_shutdown,
.set_termios = ubi32_uarttio_set_termios,
.type = ubi32_uarttio_type,
.release_port = ubi32_uarttio_release_port,
.request_port = ubi32_uarttio_request_port,
.config_port = ubi32_uarttio_config_port,
.verify_port = ubi32_uarttio_verify_port,
};
/*
* ubi32_uarttio_add_ports
*/
static int __init ubi32_uarttio_add_ports(void)
{
int res = 0;
struct ubi32_uarttio_port *uup = uarttio_ports;
int i = 0;
for (i = 0; i < uarttio_nports; i++) {
/*
* Setup the GPIOs
*/
res = gpio_request(uup->tx_pin, "ubi32_uarttio_tx");
if (res) {
printk(KERN_WARNING "Failed to request GPIO %d\n", uup->tx_pin);
res = -EBUSY;
goto next;
}
res = gpio_request(uup->rx_pin, "ubi32_uarttio_rx");
if (res) {
gpio_free(uup->tx_pin);
printk(KERN_WARNING "Failed to request GPIO %d\n", uup->rx_pin);
res = -EBUSY;
goto next;
}
res = uart_add_one_port(&ubi32_uarttio_uart_driver, &uup->port);
if (res) {
gpio_free(uup->rx_pin);
gpio_free(uup->tx_pin);
res = -ENODEV;
printk(KERN_WARNING "Failed to add port %d,%d\n", uup->tx_pin, uup->rx_pin);
goto next;
}
uup->added = 1;
/*
* Set the direction of the ports now, after we're sure that everything is ok
*/
if (!uup->port_init) {
gpio_direction_output(uup->tx_pin, 1);
gpio_direction_input(uup->rx_pin);
}
next:
uup++;
}
return res;
}
/*
* ubi32_uarttio_cleanup
*/
static void ubi32_uarttio_cleanup(void)
{
struct ubi32_uarttio_port *uup;
int i;
/*
* Stop the hardware thread
*/
if (uarttio_inst.regs) {
thread_disable(uarttio_inst.regs->thread);
}
if (uarttio_inst.irq_requested) {
free_irq(uarttio_inst.irq, NULL);
}
/*
* Get rid of the ports
*/
uup = uarttio_inst.ports;
for (i = 0; i < uarttio_nports; i++) {
gpio_free(uup->tx_pin);
gpio_free(uup->rx_pin);
if (uup->added) {
uart_remove_one_port(&ubi32_uarttio_uart_driver, &uup->port);
}
uup++;
}
if (uarttio_inst.driver_registered) {
uart_unregister_driver(&ubi32_uarttio_uart_driver);
}
}
/*
* ubi32_uarttio_setup_port
* Setup a port in the TIO registers
*/
static int ubi32_uarttio_setup_port(int index,
struct uarttio_uart *uart,
unsigned int baud, unsigned int tx_pin,
unsigned int rx_pin)
{
struct ubi32_uarttio_port *uup = &uarttio_ports[index];
void *tx_port = ubi_gpio_get_port(tx_pin);
void *rx_port = ubi_gpio_get_port(rx_pin);
/*
* Verify the ports are on chip
*/
if (!tx_port || !rx_port) {
printk(KERN_WARNING "Invalid port(s) specified: %u or %u\n", tx_pin, rx_pin);
return -EINVAL;
}
uup->tx_pin = tx_pin;
uup->rx_pin = rx_pin;
uup->uart = uart;
/*
* Setup the port structure
*/
uup->port.ops = &ubi32_uarttio_pops;
uup->port.line = index;
uup->port.iotype = UPIO_MEM;
uup->port.flags = UPF_BOOT_AUTOCONF;
uup->port.fifosize = uup->uart->tx_fifo_size;
uup->port.private_data = uup;
/*
* We share this IRQ across all ports
*/
uup->port.irq = uarttio_inst.irq;
/*
* We really don't have a mem/map base but without these variables
* set, the serial_core won't startup.
*/
uup->port.membase = (void __iomem *)uup;
uup->port.mapbase = (resource_size_t)uup;
spin_lock_init(&uup->port.lock);
/*
* Set up the hardware
*/
uart->flags = UARTTIO_UART_FLAG_SET_RATE | UARTTIO_UART_FLAG_RESET;
uart->tx_port = (unsigned int)tx_port;
uart->tx_pin = gpio_pin_index(tx_pin);
uart->tx_bits = 8;
uart->tx_stop_bits = 1;
uart->rx_port = (unsigned int)rx_port;
uart->rx_pin = gpio_pin_index(rx_pin);
uart->rx_bits = 8;
uart->rx_stop_bits = 1;
uart->baud_rate = baud;
return 0;
}
enum ubi32_uarttio_parse_states {
UBI32_UARTTIO_PARSE_STATE_BAUD,
UBI32_UARTTIO_PARSE_STATE_TX_PIN,
UBI32_UARTTIO_PARSE_STATE_RX_PIN,
UBI32_UARTTIO_PARSE_STATE_HS,
UBI32_UARTTIO_PARSE_STATE_CTS_PIN,
UBI32_UARTTIO_PARSE_STATE_RTS_PIN,
};
/*
* ubi32_uarttio_parse_param
*/
static int ubi32_uarttio_parse_param(char *str)
{
int res;
int i;
int baud = 0;
int tx_pin = 0;
int rx_pin = 0;
int hs = 0;
int cts_pin = 0;
int rts_pin = 0;
int nfound = 0;
enum ubi32_uarttio_parse_states state = UBI32_UARTTIO_PARSE_STATE_BAUD;
struct uarttio_uart *uart = uarttio_inst.regs->uarts;
/*
* Run though the options and generate the proper structures
*/
res = get_option(&str, &i);
while ((res == 2) || (res == 1)) {
switch (state) {
case UBI32_UARTTIO_PARSE_STATE_BAUD:
/*
* If we are here and nfound > 0 then create the port
* based on the previous input
*/
if (nfound) {
/*
* Create the port
*/
if (ubi32_uarttio_setup_port(nfound - 1, uart, baud, tx_pin, rx_pin)) {
/*
* Port was invalid
*/
goto fail;
} else {
printk(KERN_INFO "Serial port %d: tx=%d:rx=%d @ %d\n", nfound, tx_pin, rx_pin, baud);
uart++;
}
}
/*
* Reset the variables and go to the next state
*/
hs = 0;
baud = i;
state = UBI32_UARTTIO_PARSE_STATE_TX_PIN;
break;
case UBI32_UARTTIO_PARSE_STATE_TX_PIN:
tx_pin = i;
state = UBI32_UARTTIO_PARSE_STATE_RX_PIN;
break;
case UBI32_UARTTIO_PARSE_STATE_RX_PIN:
rx_pin = i;
state = UBI32_UARTTIO_PARSE_STATE_HS;
break;
case UBI32_UARTTIO_PARSE_STATE_HS:
hs = i;
if (hs) {
state = UBI32_UARTTIO_PARSE_STATE_CTS_PIN;
break;
}
if (nfound == uarttio_inst.regs->max_uarts) {
printk(KERN_WARNING "Maximum number of serial ports reached\n");
goto done;
}
nfound++;
state = UBI32_UARTTIO_PARSE_STATE_BAUD;
break;
case UBI32_UARTTIO_PARSE_STATE_CTS_PIN:
cts_pin = i;
state = UBI32_UARTTIO_PARSE_STATE_RTS_PIN;
break;
case UBI32_UARTTIO_PARSE_STATE_RTS_PIN:
rts_pin = i;
if (nfound == uarttio_inst.regs->max_uarts) {
printk(KERN_WARNING "Maximum number of serial ports reached\n");
goto done;
}
nfound++;
state = UBI32_UARTTIO_PARSE_STATE_BAUD;
break;
}
res = get_option(&str, &i);
}
if ((res > 2) || state != UBI32_UARTTIO_PARSE_STATE_BAUD) {
printk(KERN_WARNING "Parameter syntax error.\n");
res = -EINVAL;
goto fail;
}
/*
* Create the final port
*/
if (ubi32_uarttio_setup_port(nfound - 1, uart, baud, tx_pin, rx_pin)) {
goto fail;
}
printk(KERN_INFO "Serial port %d: tx=%d:rx=%d @ %d\n", nfound, tx_pin, rx_pin, baud);
done:
uarttio_nports = nfound;
return nfound ? 0 : -ENODEV;
fail:
/*
* Reset the ports
*/
uart = uarttio_inst.regs->uarts;
for (i = 0; i < uarttio_inst.regs->max_uarts; i++) {
uart->flags = 0;
uart++;
}
return res;
}
/*
* ubi32_uarttio_probe
*/
static int ubi32_uarttio_probe(void)
{
int ret;
struct uarttio_node *uart_node;
char *str = utio_ports_param;
static int probed;
static int probe_result;
/*
* We only want to be probed once, we could be probed twice
* for example if we are used as a console
*/
if (probed) {
return probe_result;
}
probed = 1;
/*
* Extract the TIO name from the setup string
*/
while (*str) {
if (*str == ',') {
*str++ = 0;
break;
}
str++;
}
if (!*str) {
probe_result = -EINVAL;
return -EINVAL;
}
uart_node = (struct uarttio_node *)devtree_find_node(utio_ports_param);
if (!uart_node) {
probe_result = -ENODEV;
return -ENODEV;
}
uarttio_inst.irq = uart_node->dn.recvirq;
uarttio_inst.regs = uart_node->regs;
/*
* Parse module parameters.
*/
ret = ubi32_uarttio_parse_param(str);
if (ret != 0) {
ubi32_uarttio_cleanup();
probe_result = ret;
return ret;
}
ubi32_uarttio_uart_driver.nr = uarttio_nports;
return 0;
}
#if defined(CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE)
/*
* ubi32_uarttio_console_setup
*/
static int __init ubi32_uarttio_console_setup(struct console *co, char *options)
{
int baud;
int bits = 8;
int parity = 'n';
int flow = 'n';
struct ubi32_uarttio_port *uup;
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index == -1 || co->index >= uarttio_nports) {
co->index = 0;
}
uup = &uarttio_ports[co->index];
baud = uup->uart->baud_rate;
uup->uart->flags |= UARTTIO_UART_FLAG_ENABLED;
/*
* Setup the GPIOs
* We have to use the direct interface because the gpio
* subsystem is not available at this point.
*/
uup->port_init = 1;
UBICOM32_GPIO_SET_PIN_HIGH(uup->tx_pin);
UBICOM32_GPIO_SET_PIN_OUTPUT(uup->tx_pin);
UBICOM32_GPIO_SET_PIN_INPUT(uup->rx_pin);
/*
* Start the thread
*/
thread_enable(uarttio_inst.regs->thread);
/*
* Process options
*/
if (options) {
uart_parse_options(options, &baud, &parity, &bits, &flow);
if (ubi32_uarttio_set_baud(uup, baud)) {
baud = uup->uart->current_baud_rate;
}
}
return uart_set_options(&uup->port, co, baud, 'n', 8, 'n');
}
/*
* ubi32_uarttio_console_putchar
*/
static void ubi32_uarttio_console_putchar(struct uart_port *port, int ch)
{
struct ubi32_uarttio_port *uup = port->private_data;
while (ubi32_uarttio_put_char(uup->uart, ch)) {
cpu_relax();
}
}
/*
* ubi32_uarttio_console_write
* Interrupts are disabled on entering
*/
static void ubi32_uarttio_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_port *port = &(uarttio_ports[co->index].port);
unsigned long flags = 0;
spin_lock_irqsave(&port->lock, flags);
uart_console_write(port, s, count, ubi32_uarttio_console_putchar);
spin_unlock_irqrestore(&port->lock, flags);
}
static struct console ubi32_uarttio_console = {
.name = UBI32_UARTTIO_NAME,
.write = ubi32_uarttio_console_write,
.device = uart_console_device,
.setup = ubi32_uarttio_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &ubi32_uarttio_uart_driver,
};
static int __init ubi32_uarttio_console_init(void)
{
int res;
res = ubi32_uarttio_probe();
if (res) {
return res;
}
register_console(&ubi32_uarttio_console);
return 0;
}
console_initcall(ubi32_uarttio_console_init);
#endif /* CONFIG_SERIAL_UBI32_UARTTIO_CONSOLE */
/*
* ubi32_serial_suspend
*/
static int ubi32_uarttio_suspend(struct platform_device *pdev, pm_message_t state)
{
int i;
for (i = 0; i < uarttio_nports; i++) {
uart_suspend_port(&ubi32_uarttio_uart_driver, &uarttio_ports[i].port);
}
return 0;
}
/*
* ubi32_serial_resume
*/
static int ubi32_uarttio_resume(struct platform_device *pdev)
{
int i;
for (i = 0; i < uarttio_nports; i++) {
uart_resume_port(&ubi32_uarttio_uart_driver, &uarttio_ports[i].port);
}
return 0;
}
/*
* ubi32_uarttio_remove
*/
static int __devexit ubi32_uarttio_remove(struct platform_device *pdev)
{
ubi32_uarttio_cleanup();
uart_unregister_driver(&ubi32_uarttio_uart_driver);
return 0;
}
static struct platform_driver ubi32_uarttio_platform_driver = {
.remove = __devexit_p(ubi32_uarttio_remove),
.suspend = ubi32_uarttio_suspend,
.resume = ubi32_uarttio_resume,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
#ifndef MODULE
/*
* Called at boot time.
*
* uarttio=TIONAME,(baud,tx_pin,rx_pin,handshake[,cts_pin,rts_pin],...)
* TIONAME is the name of the devtree node which describes the UARTTIO
* pin is the index of the pin, i.e. PA4 is 5 [(port * 32) + pin]
* handshake = 1 to enable handshaking, provide cts_pin, rts_pin (UNSUPPORTED)
* handshake = 0 to disable handshaking, do not provide cts_pin, rts_pin
* Ex: uarttio=UARTTIO,57600,7,6,0,9600,8,9,0
*/
static int __init ubi32_uarttio_setup(char *str)
{
strncpy(utio_ports_param, str, UBI32_UARTTIO_MAX_PARAM_LEN);
utio_ports_param[UBI32_UARTTIO_MAX_PARAM_LEN - 1] = 0;
return 1;
}
__setup("uarttio=", ubi32_uarttio_setup);
#endif
/*
* ubi32_uarttio_init
*/
static int __init ubi32_uarttio_init(void)
{
int ret;
int i;
ret = ubi32_uarttio_probe();
if (ret) {
return ret;
}
/*
* Request the IRQ (do it here since many ports share the same IRQ)
*/
ret = request_irq(uarttio_inst.irq, ubi32_uarttio_isr, IRQF_DISABLED, DRIVER_NAME, NULL);
if (ret != 0) {
printk(KERN_WARNING "Could not request IRQ %d\n", uarttio_inst.irq);
goto fail;
}
uarttio_inst.irq_requested = 1;
/*
* Register the UART driver and add the ports
*/
ret = uart_register_driver(&ubi32_uarttio_uart_driver);
if (ret != 0) {
goto fail;
}
uarttio_inst.driver_registered = 1;
ret = ubi32_uarttio_add_ports();
if (ret != 0) {
ubi32_uarttio_cleanup();
return ret;
}
/*
* Start the thread
*/
thread_enable(uarttio_inst.regs->thread);
for (i = 0; i < uarttio_nports; i++) {
pr_info("Serial: Ubicom32 uarttio #%d: tx:%d rx:%d baud:%d\n",
i, uarttio_ports[i].tx_pin, uarttio_ports[i].rx_pin,
uarttio_ports[i].uart->current_baud_rate);
}
pr_info("Serial: Ubicom32 uarttio started on thread:%d irq:%d\n", uarttio_inst.regs->thread, uarttio_inst.irq);
return ret;
fail:
ubi32_uarttio_cleanup();
return ret;
}
module_init(ubi32_uarttio_init);
/*
* ubi32_uarttio_exit
*/
static void __exit ubi32_uarttio_exit(void)
{
platform_driver_unregister(&ubi32_uarttio_platform_driver);
}
module_exit(ubi32_uarttio_exit);
module_param_string(ports, utio_ports_param, sizeof(utio_ports_param), 0444);
MODULE_PARM_DESC(ports, "Sets the ports to allocate: ports=TIONAME,(baud,txpin,rxpin,handshake[,ctspin,rtspin],...)\n"
" TIONAME is the name of the devtree node which describes the UARTTIO\n"
" pin is the index of the pin, i.e. PA4 is 5 [(port * 32) + pin]\n"
" handshake = 1 to enable handshaking, provide ctspin, rtspin (UNSUPPORTED)\n"
" handshake = 0 to disable handshaking, do not provide ctspin, rtspin\n"
" Ex: ports=UARTTIO,57600,7,6,0,9600,8,9,0\n");
MODULE_AUTHOR("Patrick Tjin <pat.tjin@ubicom.com>");
MODULE_DESCRIPTION("Ubicom serial virtual peripherial driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(UBI32_UARTTIO_MAJOR);
MODULE_ALIAS("platform:" DRIVER_NAME);
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