#include <linux/tty_flip.h>
#include <linux/serial_core.h>
+#include <asm/bfin_sport.h>
#include <asm/delay.h>
#include <asm/portmux.h>
#include "bfin_sport_uart.h"
-#ifdef CONFIG_SERIAL_BFIN_SPORT0_UART
-unsigned short bfin_uart_pin_req_sport0[] =
- {P_SPORT0_TFS, P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS, \
- P_SPORT0_DRPRI, P_SPORT0_RSCLK, P_SPORT0_DRSEC, P_SPORT0_DTSEC, 0};
-#endif
-#ifdef CONFIG_SERIAL_BFIN_SPORT1_UART
-unsigned short bfin_uart_pin_req_sport1[] =
- {P_SPORT1_TFS, P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, \
- P_SPORT1_DRPRI, P_SPORT1_RSCLK, P_SPORT1_DRSEC, P_SPORT1_DTSEC, 0};
-#endif
-#ifdef CONFIG_SERIAL_BFIN_SPORT2_UART
-unsigned short bfin_uart_pin_req_sport2[] =
- {P_SPORT2_TFS, P_SPORT2_DTPRI, P_SPORT2_TSCLK, P_SPORT2_RFS, \
- P_SPORT2_DRPRI, P_SPORT2_RSCLK, P_SPORT2_DRSEC, P_SPORT2_DTSEC, 0};
-#endif
-#ifdef CONFIG_SERIAL_BFIN_SPORT3_UART
-unsigned short bfin_uart_pin_req_sport3[] =
- {P_SPORT3_TFS, P_SPORT3_DTPRI, P_SPORT3_TSCLK, P_SPORT3_RFS, \
- P_SPORT3_DRPRI, P_SPORT3_RSCLK, P_SPORT3_DRSEC, P_SPORT3_DTSEC, 0};
-#endif
-
struct sport_uart_port {
struct uart_port port;
int err_irq;
unsigned short txmask2;
unsigned char stopb;
/* unsigned char parib; */
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+ int cts_pin;
+ int rts_pin;
+#endif
};
-static void sport_uart_tx_chars(struct sport_uart_port *up);
+static int sport_uart_tx_chars(struct sport_uart_port *up);
static void sport_stop_tx(struct uart_port *port);
static inline void tx_one_byte(struct sport_uart_port *up, unsigned int value)
return IRQ_HANDLED;
}
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+static unsigned int sport_get_mctrl(struct uart_port *port)
+{
+ struct sport_uart_port *up = (struct sport_uart_port *)port;
+ if (up->cts_pin < 0)
+ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+ /* CTS PIN is negative assertive. */
+ if (SPORT_UART_GET_CTS(up))
+ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+ else
+ return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct sport_uart_port *up = (struct sport_uart_port *)port;
+ if (up->rts_pin < 0)
+ return;
+
+ /* RTS PIN is negative assertive. */
+ if (mctrl & TIOCM_RTS)
+ SPORT_UART_ENABLE_RTS(up);
+ else
+ SPORT_UART_DISABLE_RTS(up);
+}
+
+/*
+ * Handle any change of modem status signal.
+ */
+static irqreturn_t sport_mctrl_cts_int(int irq, void *dev_id)
+{
+ struct sport_uart_port *up = (struct sport_uart_port *)dev_id;
+ unsigned int status;
+
+ status = sport_get_mctrl(&up->port);
+ uart_handle_cts_change(&up->port, status & TIOCM_CTS);
+
+ return IRQ_HANDLED;
+}
+#else
+static unsigned int sport_get_mctrl(struct uart_port *port)
+{
+ pr_debug("%s enter\n", __func__);
+ return TIOCM_CTS | TIOCM_CD | TIOCM_DSR;
+}
+
+static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ pr_debug("%s enter\n", __func__);
+}
+#endif
+
/* Reqeust IRQ, Setup clock */
static int sport_startup(struct uart_port *port)
{
goto fail2;
}
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+ if (up->cts_pin >= 0) {
+ if (request_irq(gpio_to_irq(up->cts_pin),
+ sport_mctrl_cts_int,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+ IRQF_DISABLED, "BFIN_SPORT_UART_CTS", up)) {
+ up->cts_pin = -1;
+ dev_info(port->dev, "Unable to attach BlackFin UART \
+ over SPORT CTS interrupt. So, disable it.\n");
+ }
+ }
+ if (up->rts_pin >= 0)
+ gpio_direction_output(up->rts_pin, 0);
+#endif
+
return 0;
fail2:
free_irq(up->port.irq+1, up);
return ret;
}
-static void sport_uart_tx_chars(struct sport_uart_port *up)
+/*
+ * sport_uart_tx_chars
+ *
+ * ret 1 means need to enable sport.
+ * ret 0 means do nothing.
+ */
+static int sport_uart_tx_chars(struct sport_uart_port *up)
{
struct circ_buf *xmit = &up->port.state->xmit;
if (SPORT_GET_STAT(up) & TXF)
- return;
+ return 0;
if (up->port.x_char) {
tx_one_byte(up, up->port.x_char);
up->port.icount.tx++;
up->port.x_char = 0;
- return;
+ return 1;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
- sport_stop_tx(&up->port);
- return;
+ /* The waiting loop to stop SPORT TX from TX interrupt is
+ * too long. This may block SPORT RX interrupts and cause
+ * RX FIFO overflow. So, do stop sport TX only after the last
+ * char in TX FIFO is moved into the shift register.
+ */
+ if (SPORT_GET_STAT(up) & TXHRE)
+ sport_stop_tx(&up->port);
+ return 0;
}
while(!(SPORT_GET_STAT(up) & TXF) && !uart_circ_empty(xmit)) {
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
+
+ return 1;
}
static unsigned int sport_tx_empty(struct uart_port *port)
return 0;
}
-static unsigned int sport_get_mctrl(struct uart_port *port)
-{
- pr_debug("%s enter\n", __func__);
- return (TIOCM_CTS | TIOCM_CD | TIOCM_DSR);
-}
-
-static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- pr_debug("%s enter\n", __func__);
-}
-
static void sport_stop_tx(struct uart_port *port)
{
struct sport_uart_port *up = (struct sport_uart_port *)port;
pr_debug("%s enter\n", __func__);
+ if (!(SPORT_GET_TCR1(up) & TSPEN))
+ return;
+
/* Although the hold register is empty, last byte is still in shift
* register and not sent out yet. So, put a dummy data into TX FIFO.
* Then, sport tx stops when last byte is shift out and the dummy
pr_debug("%s enter\n", __func__);
/* Write data into SPORT FIFO before enable SPROT to transmit */
- sport_uart_tx_chars(up);
+ if (sport_uart_tx_chars(up)) {
+ /* Enable transmit, then an interrupt will generated */
+ SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
+ SSYNC();
+ }
- /* Enable transmit, then an interrupt will generated */
- SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
- SSYNC();
pr_debug("%s exit\n", __func__);
}
free_irq(up->port.irq, up);
free_irq(up->port.irq+1, up);
free_irq(up->err_irq, up);
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+ if (up->cts_pin >= 0)
+ free_irq(gpio_to_irq(up->cts_pin), up);
+#endif
}
static const char *sport_type(struct uart_port *port)
/* up->parib = 1; */
}
- port->read_status_mask = OE;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= (FE | PE);
- if (termios->c_iflag & (BRKINT | PARMRK))
- port->read_status_mask |= BI;
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ port->read_status_mask = 0;
/*
* Characters to ignore
*/
port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= FE | PE;
- if (termios->c_iflag & IGNBRK) {
- port->ignore_status_mask |= BI;
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= OE;
- }
/* RX extract mask */
up->rxmask = 0x01 | (((up->csize + up->stopb) * 2 - 1) << 0x8);
/* uart baud rate */
port->uartclk = uart_get_baud_rate(port, termios, old, 0, get_sclk()/16);
- spin_lock_irqsave(&up->port.lock, flags);
-
/* Disable UART */
SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
static struct sport_uart_port *bfin_sport_uart_ports[BFIN_SPORT_UART_MAX_PORTS];
#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
+#define CLASS_BFIN_SPORT_CONSOLE "bfin-sport-console"
+
static int __init
sport_uart_console_setup(struct console *co, char *options)
{
int baud = 57600;
int bits = 8;
int parity = 'n';
+# ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+ int flow = 'r';
+# else
int flow = 'n';
+# endif
/* Check whether an invalid uart number has been specified */
if (co->index < 0 || co->index >= BFIN_SPORT_UART_MAX_PORTS)
if (bfin_sport_uart_ports[pdev->id] == NULL) {
bfin_sport_uart_ports[pdev->id] =
- kmalloc(sizeof(struct sport_uart_port), GFP_KERNEL);
+ kzalloc(sizeof(struct sport_uart_port), GFP_KERNEL);
sport = bfin_sport_uart_ports[pdev->id];
if (!sport) {
dev_err(&pdev->dev,
- "Fail to kmalloc sport_uart_port\n");
+ "Fail to malloc sport_uart_port\n");
return -ENOMEM;
}
goto out_error_free_peripherals;
}
- sport->port.membase = ioremap(res->start,
- res->end - res->start);
+ sport->port.membase = ioremap(res->start, resource_size(res));
if (!sport->port.membase) {
dev_err(&pdev->dev, "Cannot map sport IO\n");
ret = -ENXIO;
goto out_error_free_peripherals;
}
+ sport->port.mapbase = res->start;
sport->port.irq = platform_get_irq(pdev, 0);
if (sport->port.irq < 0) {
ret = -ENOENT;
goto out_error_unmap;
}
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (res == NULL)
+ sport->cts_pin = -1;
+ else
+ sport->cts_pin = res->start;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+ if (res == NULL)
+ sport->rts_pin = -1;
+ else
+ sport->rts_pin = res->start;
+
+ if (sport->rts_pin >= 0)
+ gpio_request(sport->rts_pin, DRV_NAME);
+#endif
}
#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
if (sport) {
uart_remove_one_port(&sport_uart_reg, &sport->port);
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+ if (sport->rts_pin >= 0)
+ gpio_free(sport->rts_pin);
+#endif
iounmap(sport->port.membase);
peripheral_free_list(
(unsigned short *)pdev->dev.platform_data);
#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
static __initdata struct early_platform_driver early_sport_uart_driver = {
- .class_str = DRV_NAME,
+ .class_str = CLASS_BFIN_SPORT_CONSOLE,
.pdrv = &sport_uart_driver,
.requested_id = EARLY_PLATFORM_ID_UNSET,
};
{
early_platform_driver_register(&early_sport_uart_driver, DRV_NAME);
- early_platform_driver_probe(DRV_NAME, BFIN_SPORT_UART_MAX_PORTS, 0);
+ early_platform_driver_probe(CLASS_BFIN_SPORT_CONSOLE,
+ BFIN_SPORT_UART_MAX_PORTS, 0);
register_console(&sport_uart_console);
{
int ret;
- pr_info("Serial: Blackfin uart over sport driver\n");
+ pr_info("Blackfin uart over sport driver\n");
ret = uart_register_driver(&sport_uart_reg);
if (ret) {
git.openpandora.org / pandora-kernel.git / blobdiff