serial: bfin_sport_uart: add support for CTS/RTS via GPIOs
Some people need flow control on their ports, so now boards can support that via any GPIOs. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>hifive-unleashed-5.1
Sonic Zhang
Greg Kroah-Hartman
parent
b59588aae8
commit
1f7d1c85df
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@ -1443,24 +1443,48 @@ config SERIAL_BFIN_SPORT0_UART
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help
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Enable UART over SPORT0
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config SERIAL_BFIN_SPORT0_UART_CTSRTS
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bool "Enable UART over SPORT0 hardware flow control"
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depends on SERIAL_BFIN_SPORT0_UART
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help
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Enable hardware flow control in the driver.
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config SERIAL_BFIN_SPORT1_UART
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bool "Enable UART over SPORT1"
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depends on SERIAL_BFIN_SPORT
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help
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Enable UART over SPORT1
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config SERIAL_BFIN_SPORT1_UART_CTSRTS
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bool "Enable UART over SPORT1 hardware flow control"
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depends on SERIAL_BFIN_SPORT1_UART
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help
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Enable hardware flow control in the driver.
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config SERIAL_BFIN_SPORT2_UART
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bool "Enable UART over SPORT2"
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depends on SERIAL_BFIN_SPORT && (BF54x || BF538 || BF539)
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help
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Enable UART over SPORT2
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config SERIAL_BFIN_SPORT2_UART_CTSRTS
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bool "Enable UART over SPORT2 hardware flow control"
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depends on SERIAL_BFIN_SPORT2_UART
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help
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Enable hardware flow control in the driver.
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config SERIAL_BFIN_SPORT3_UART
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bool "Enable UART over SPORT3"
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depends on SERIAL_BFIN_SPORT && (BF54x || BF538 || BF539)
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help
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Enable UART over SPORT3
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config SERIAL_BFIN_SPORT3_UART_CTSRTS
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bool "Enable UART over SPORT3 hardware flow control"
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depends on SERIAL_BFIN_SPORT3_UART
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help
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Enable hardware flow control in the driver.
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config SERIAL_TIMBERDALE
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tristate "Support for timberdale UART"
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select SERIAL_CORE
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@ -48,6 +48,10 @@ struct sport_uart_port {
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unsigned short txmask2;
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unsigned char stopb;
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/* unsigned char parib; */
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#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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int cts_pin;
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int rts_pin;
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#endif
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};
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static void sport_uart_tx_chars(struct sport_uart_port *up);
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@ -198,6 +202,59 @@ static irqreturn_t sport_uart_err_irq(int irq, void *dev_id)
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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static unsigned int sport_get_mctrl(struct uart_port *port)
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{
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struct sport_uart_port *up = (struct sport_uart_port *)port;
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if (up->cts_pin < 0)
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return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
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/* CTS PIN is negative assertive. */
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if (SPORT_UART_GET_CTS(up))
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return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
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else
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return TIOCM_DSR | TIOCM_CAR;
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}
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static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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struct sport_uart_port *up = (struct sport_uart_port *)port;
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if (up->rts_pin < 0)
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return;
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/* RTS PIN is negative assertive. */
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if (mctrl & TIOCM_RTS)
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SPORT_UART_ENABLE_RTS(up);
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else
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SPORT_UART_DISABLE_RTS(up);
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}
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/*
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* Handle any change of modem status signal.
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*/
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static irqreturn_t sport_mctrl_cts_int(int irq, void *dev_id)
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{
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struct sport_uart_port *up = (struct sport_uart_port *)dev_id;
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unsigned int status;
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status = sport_get_mctrl(&up->port);
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uart_handle_cts_change(&up->port, status & TIOCM_CTS);
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return IRQ_HANDLED;
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}
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#else
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static unsigned int sport_get_mctrl(struct uart_port *port)
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{
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pr_debug("%s enter\n", __func__);
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return TIOCM_CTS | TIOCM_CD | TIOCM_DSR;
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}
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static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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pr_debug("%s enter\n", __func__);
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}
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#endif
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/* Reqeust IRQ, Setup clock */
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static int sport_startup(struct uart_port *port)
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{
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@ -226,6 +283,21 @@ static int sport_startup(struct uart_port *port)
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goto fail2;
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}
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#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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if (up->cts_pin >= 0) {
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if (request_irq(gpio_to_irq(up->cts_pin),
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sport_mctrl_cts_int,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
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IRQF_DISABLED, "BFIN_SPORT_UART_CTS", up)) {
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up->cts_pin = -1;
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dev_info(port->dev, "Unable to attach BlackFin UART \
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over SPORT CTS interrupt. So, disable it.\n");
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}
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}
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if (up->rts_pin >= 0)
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gpio_direction_output(up->rts_pin, 0);
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#endif
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return 0;
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fail2:
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free_irq(up->port.irq+1, up);
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@ -283,17 +355,6 @@ static unsigned int sport_tx_empty(struct uart_port *port)
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return 0;
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}
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static unsigned int sport_get_mctrl(struct uart_port *port)
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{
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pr_debug("%s enter\n", __func__);
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return (TIOCM_CTS | TIOCM_CD | TIOCM_DSR);
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}
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static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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pr_debug("%s enter\n", __func__);
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}
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static void sport_stop_tx(struct uart_port *port)
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{
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struct sport_uart_port *up = (struct sport_uart_port *)port;
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@ -364,6 +425,10 @@ static void sport_shutdown(struct uart_port *port)
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free_irq(up->port.irq, up);
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free_irq(up->port.irq+1, up);
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free_irq(up->err_irq, up);
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#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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if (up->cts_pin >= 0)
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free_irq(gpio_to_irq(up->cts_pin), up);
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#endif
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}
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static const char *sport_type(struct uart_port *port)
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@ -536,7 +601,11 @@ sport_uart_console_setup(struct console *co, char *options)
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int baud = 57600;
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int bits = 8;
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int parity = 'n';
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# ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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int flow = 'r';
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# else
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int flow = 'n';
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# endif
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/* Check whether an invalid uart number has been specified */
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if (co->index < 0 || co->index >= BFIN_SPORT_UART_MAX_PORTS)
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@ -729,6 +798,22 @@ static int __devinit sport_uart_probe(struct platform_device *pdev)
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ret = -ENOENT;
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goto out_error_unmap;
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}
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#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (res == NULL)
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sport->cts_pin = -1;
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else
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sport->cts_pin = res->start;
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res = platform_get_resource(pdev, IORESOURCE_IO, 1);
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if (res == NULL)
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sport->rts_pin = -1;
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else
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sport->rts_pin = res->start;
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if (sport->rts_pin >= 0)
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gpio_request(sport->rts_pin, DRV_NAME);
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#endif
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}
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#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
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@ -767,6 +852,10 @@ static int __devexit sport_uart_remove(struct platform_device *pdev)
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if (sport) {
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uart_remove_one_port(&sport_uart_reg, &sport->port);
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#ifdef CONFIG_SERIAL_BFIN_CTSRTS
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if (sport->rts_pin >= 0)
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gpio_free(sport->rts_pin);
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#endif
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iounmap(sport->port.membase);
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peripheral_free_list(
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(unsigned short *)pdev->dev.platform_data);
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@ -72,4 +72,15 @@
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#define SPORT_TX_FIFO_SIZE 8
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#define SPORT_UART_GET_CTS(x) gpio_get_value(x->cts_pin)
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#define SPORT_UART_DISABLE_RTS(x) gpio_set_value(x->rts_pin, 1)
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#define SPORT_UART_ENABLE_RTS(x) gpio_set_value(x->rts_pin, 0)
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#if defined(CONFIG_SERIAL_BFIN_SPORT0_UART_CTSRTS) \
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|| defined(CONFIG_SERIAL_BFIN_SPORT1_UART_CTSRTS) \
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|| defined(CONFIG_SERIAL_BFIN_SPORT2_UART_CTSRTS) \
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|| defined(CONFIG_SERIAL_BFIN_SPORT3_UART_CTSRTS)
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# define CONFIG_SERIAL_BFIN_SPORT_CTSRTS
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#endif
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#endif /* _BFIN_SPORT_UART_H */
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