* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
+ * [29-Mar-2005] Mike Lee
+ * Added hardware handshake
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
-#include <linux/device.h>
+#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
struct uart_port port;
struct timer_list timer;
unsigned int old_status;
- int txirq,rxirq;
+ int txirq,rxirq,rtsirq;
};
/*
/*
* interrupts disabled on entry
*/
-static void imx_stop_tx(struct uart_port *port, unsigned int tty_stop)
+static void imx_stop_tx(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN;
} while (!(UTS((u32)sport->port.membase) & UTS_TXFULL));
if (uart_circ_empty(xmit))
- imx_stop_tx(&sport->port, 0);
+ imx_stop_tx(&sport->port);
}
/*
* interrupts disabled on entry
*/
-static void imx_start_tx(struct uart_port *port, unsigned int tty_start)
+static void imx_start_tx(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
imx_transmit_buffer(sport);
}
+static irqreturn_t imx_rtsint(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct imx_port *sport = (struct imx_port *)dev_id;
+ unsigned int val = USR1((u32)sport->port.membase)&USR1_RTSS;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+
+ USR1((u32)sport->port.membase) = USR1_RTSD;
+ uart_handle_cts_change(&sport->port, !!val);
+ wake_up_interruptible(&sport->port.info->delta_msr_wait);
+
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+ return IRQ_HANDLED;
+}
+
static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)
{
struct imx_port *sport = (struct imx_port *)dev_id;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
- imx_stop_tx(&sport->port, 0);
+ imx_stop_tx(&sport->port);
goto out;
}
error_return:
tty_insert_flip_char(tty, rx, flg);
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- goto out;
-
ignore_char:
rx = URXD0((u32)sport->port.membase);
} while(rx & URXD_CHARRDY);
return USR2((u32)sport->port.membase) & USR2_TXDC ? TIOCSER_TEMT : 0;
}
+/*
+ * We have a modem side uart, so the meanings of RTS and CTS are inverted.
+ */
static unsigned int imx_get_mctrl(struct uart_port *port)
{
- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+ struct imx_port *sport = (struct imx_port *)port;
+ unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
+
+ if (USR1((u32)sport->port.membase) & USR1_RTSS)
+ tmp |= TIOCM_CTS;
+
+ if (UCR2((u32)sport->port.membase) & UCR2_CTS)
+ tmp |= TIOCM_RTS;
+
+ return tmp;
}
static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
+ struct imx_port *sport = (struct imx_port *)port;
+
+ if (mctrl & TIOCM_RTS)
+ UCR2((u32)sport->port.membase) |= UCR2_CTS;
+ else
+ UCR2((u32)sport->port.membase) &= ~UCR2_CTS;
}
/*
#define TXTL 2 /* reset default */
#define RXTL 1 /* reset default */
+static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
+{
+ unsigned int val;
+ unsigned int ufcr_rfdiv;
+
+ /* set receiver / transmitter trigger level.
+ * RFDIV is set such way to satisfy requested uartclk value
+ */
+ val = TXTL<<10 | RXTL;
+ ufcr_rfdiv = (imx_get_perclk1() + sport->port.uartclk / 2) / sport->port.uartclk;
+
+ if(!ufcr_rfdiv)
+ ufcr_rfdiv = 1;
+
+ if(ufcr_rfdiv >= 7)
+ ufcr_rfdiv = 6;
+ else
+ ufcr_rfdiv = 6 - ufcr_rfdiv;
+
+ val |= UFCR_RFDIV & (ufcr_rfdiv << 7);
+
+ UFCR((u32)sport->port.membase) = val;
+
+ return 0;
+}
+
static int imx_startup(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
int retval;
- unsigned int val;
unsigned long flags;
- /* set receiver / transmitter trigger level. We assume
- * that RFDIV has been set by the arch setup or by the bootloader.
- */
- val = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) | TXTL<<10 | RXTL;
- UFCR((u32)sport->port.membase) = val;
+ imx_setup_ufcr(sport, 0);
/* disable the DREN bit (Data Ready interrupt enable) before
* requesting IRQs
*/
retval = request_irq(sport->rxirq, imx_rxint, 0,
DRIVER_NAME, sport);
- if (retval) goto error_out2;
+ if (retval) goto error_out1;
retval = request_irq(sport->txirq, imx_txint, 0,
- "imx-uart", sport);
- if (retval) goto error_out1;
+ DRIVER_NAME, sport);
+ if (retval) goto error_out2;
+
+ retval = request_irq(sport->rtsirq, imx_rtsint,
+ SA_TRIGGER_FALLING | SA_TRIGGER_RISING,
+ DRIVER_NAME, sport);
+ if (retval) goto error_out3;
/*
* Finally, clear and enable interrupts
*/
+ USR1((u32)sport->port.membase) = USR1_RTSD;
UCR1((u32)sport->port.membase) |=
- (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);
+ (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);
/*
return 0;
-error_out1:
- free_irq(sport->rxirq, sport);
-error_out2:
+error_out3:
free_irq(sport->txirq, sport);
+error_out2:
+ free_irq(sport->rxirq, sport);
+error_out1:
return retval;
}
/*
* Free the interrupts
*/
+ free_irq(sport->rtsirq, sport);
free_irq(sport->txirq, sport);
free_irq(sport->rxirq, sport);
*/
UCR1((u32)sport->port.membase) &=
- ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);
+ ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
}
static void
else
ucr2 = UCR2_SRST | UCR2_IRTS;
+ if (termios->c_cflag & CRTSCTS) {
+ ucr2 &= ~UCR2_IRTS;
+ ucr2 |= UCR2_CTSC;
+ }
+
if (termios->c_cflag & CSTOPB)
ucr2 |= UCR2_STPB;
if (termios->c_cflag & PARENB) {
ucr2 |= UCR2_PREN;
- if (!(termios->c_cflag & PARODD))
+ if (termios->c_cflag & PARODD)
ucr2 |= UCR2_PROE;
}
* disable interrupts and drain transmitter
*/
old_ucr1 = UCR1((u32)sport->port.membase);
- UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN);
+ UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))
barrier();
{
.txirq = UART1_MINT_TX,
.rxirq = UART1_MINT_RX,
+ .rtsirq = UART1_MINT_RTS,
.port = {
.type = PORT_IMX,
- .iotype = SERIAL_IO_MEM,
+ .iotype = UPIO_MEM,
.membase = (void *)IMX_UART1_BASE,
.mapbase = IMX_UART1_BASE, /* FIXME */
.irq = UART1_MINT_RX,
.uartclk = 16000000,
.fifosize = 8,
- .flags = ASYNC_BOOT_AUTOCONF,
+ .flags = UPF_BOOT_AUTOCONF,
.ops = &imx_pops,
.line = 0,
},
}, {
.txirq = UART2_MINT_TX,
.rxirq = UART2_MINT_RX,
+ .rtsirq = UART2_MINT_RTS,
.port = {
.type = PORT_IMX,
- .iotype = SERIAL_IO_MEM,
+ .iotype = UPIO_MEM,
.membase = (void *)IMX_UART2_BASE,
.mapbase = IMX_UART2_BASE, /* FIXME */
.irq = UART2_MINT_RX,
.uartclk = 16000000,
.fifosize = 8,
- .flags = ASYNC_BOOT_AUTOCONF,
+ .flags = UPF_BOOT_AUTOCONF,
.ops = &imx_pops,
.line = 1,
},
UCR1((u32)sport->port.membase) =
(old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)
- & ~(UCR1_TXMPTYEN | UCR1_RRDYEN);
+ & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;
/*
imx_console_get_options(struct imx_port *sport, int *baud,
int *parity, int *bits)
{
+
if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) {
/* ok, the port was enabled */
unsigned int ucr2, ubir,ubmr, uartclk;
+ unsigned int baud_raw;
+ unsigned int ucfr_rfdiv;
ucr2 = UCR2((u32)sport->port.membase);
ubir = UBIR((u32)sport->port.membase) & 0xffff;
ubmr = UBMR((u32)sport->port.membase) & 0xffff;
- uartclk = sport->port.uartclk;
- *baud = ((uartclk/16) * (ubir + 1)) / (ubmr + 1);
+
+ ucfr_rfdiv = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) >> 7;
+ if (ucfr_rfdiv == 6)
+ ucfr_rfdiv = 7;
+ else
+ ucfr_rfdiv = 6 - ucfr_rfdiv;
+
+ uartclk = imx_get_perclk1();
+ uartclk /= ucfr_rfdiv;
+
+ { /*
+ * The next code provides exact computation of
+ * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
+ * without need of float support or long long division,
+ * which would be required to prevent 32bit arithmetic overflow
+ */
+ unsigned int mul = ubir + 1;
+ unsigned int div = 16 * (ubmr + 1);
+ unsigned int rem = uartclk % div;
+
+ baud_raw = (uartclk / div) * mul;
+ baud_raw += (rem * mul + div / 2) / div;
+ *baud = (baud_raw + 50) / 100 * 100;
+ }
+
+ if(*baud != baud_raw)
+ printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
+ baud_raw, *baud);
}
}
else
imx_console_get_options(sport, &baud, &parity, &bits);
+ imx_setup_ufcr(sport, 0);
+
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}
-extern struct uart_driver imx_reg;
+static struct uart_driver imx_reg;
static struct console imx_console = {
.name = "ttySMX",
.write = imx_console_write,
.cons = IMX_CONSOLE,
};
-static int serial_imx_suspend(struct device *_dev, u32 state, u32 level)
+static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
{
- struct imx_port *sport = dev_get_drvdata(_dev);
+ struct imx_port *sport = platform_get_drvdata(dev);
- if (sport && level == SUSPEND_DISABLE)
+ if (sport)
uart_suspend_port(&imx_reg, &sport->port);
return 0;
}
-static int serial_imx_resume(struct device *_dev, u32 level)
+static int serial_imx_resume(struct platform_device *dev)
{
- struct imx_port *sport = dev_get_drvdata(_dev);
+ struct imx_port *sport = platform_get_drvdata(dev);
- if (sport && level == RESUME_ENABLE)
+ if (sport)
uart_resume_port(&imx_reg, &sport->port);
return 0;
}
-static int serial_imx_probe(struct device *_dev)
+static int serial_imx_probe(struct platform_device *dev)
{
- struct platform_device *dev = to_platform_device(_dev);
-
- imx_ports[dev->id].port.dev = _dev;
+ imx_ports[dev->id].port.dev = &dev->dev;
uart_add_one_port(&imx_reg, &imx_ports[dev->id].port);
- dev_set_drvdata(_dev, &imx_ports[dev->id]);
+ platform_set_drvdata(dev, &imx_ports[dev->id]);
return 0;
}
-static int serial_imx_remove(struct device *_dev)
+static int serial_imx_remove(struct platform_device *dev)
{
- struct imx_port *sport = dev_get_drvdata(_dev);
+ struct imx_port *sport = platform_get_drvdata(dev);
- dev_set_drvdata(_dev, NULL);
+ platform_set_drvdata(dev, NULL);
if (sport)
uart_remove_one_port(&imx_reg, &sport->port);
return 0;
}
-static struct device_driver serial_imx_driver = {
- .name = "imx-uart",
- .bus = &platform_bus_type,
+static struct platform_driver serial_imx_driver = {
.probe = serial_imx_probe,
.remove = serial_imx_remove,
.suspend = serial_imx_suspend,
.resume = serial_imx_resume,
+ .driver = {
+ .name = "imx-uart",
+ },
};
static int __init imx_serial_init(void)
if (ret)
return ret;
- ret = driver_register(&serial_imx_driver);
+ ret = platform_driver_register(&serial_imx_driver);
if (ret != 0)
uart_unregister_driver(&imx_reg);
static void __exit imx_serial_exit(void)
{
uart_unregister_driver(&imx_reg);
+ platform_driver_unregister(&serial_imx_driver);
}
module_init(imx_serial_init);
git://git.onelab.eu / linux-2.6.git / blobdiff