From 9574f36fb801035f6ab0fbb1b53ce2c12c17d100 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 30 Jul 2012 10:30:26 +1000 Subject: [PATCH] OMAP/serial: Add support for driving a GPIO as DTR. OMAP hardware doesn't provide a phyisical DTR line, but some configurations may need a DTR line which tracks whether the device is open or not. So allow a gpio to be configured as the DTR line. Signed-off-by: NeilBrown Signed-off-by: Greg Kroah-Hartman --- arch/arm/mach-omap2/serial.c | 3 ++ arch/arm/plat-omap/include/plat/omap-serial.h | 7 ++++ drivers/tty/serial/omap-serial.c | 35 ++++++++++++++++++- 3 files changed, 44 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index c1b93c752d70..25d53b2800c1 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -304,6 +304,9 @@ void __init omap_serial_init_port(struct omap_board_data *bdata, omap_up.dma_rx_timeout = info->dma_rx_timeout; omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate; omap_up.autosuspend_timeout = info->autosuspend_timeout; + omap_up.DTR_gpio = info->DTR_gpio; + omap_up.DTR_inverted = info->DTR_inverted; + omap_up.DTR_present = info->DTR_present; pdata = &omap_up; pdata_size = sizeof(struct omap_uart_port_info); diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h index 1a52725ffcf2..52d3de45745f 100644 --- a/arch/arm/plat-omap/include/plat/omap-serial.h +++ b/arch/arm/plat-omap/include/plat/omap-serial.h @@ -69,6 +69,9 @@ struct omap_uart_port_info { unsigned int dma_rx_timeout; unsigned int autosuspend_timeout; unsigned int dma_rx_poll_rate; + int DTR_gpio; + int DTR_inverted; + int DTR_present; int (*get_context_loss_count)(struct device *); void (*set_forceidle)(struct platform_device *); @@ -131,6 +134,10 @@ struct uart_omap_port { u32 errata; u8 wakeups_enabled; + int DTR_gpio; + int DTR_inverted; + int DTR_active; + struct pm_qos_request pm_qos_request; u32 latency; u32 calc_latency; diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index d3cda0cb2df0..aa603f221c6a 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include @@ -507,6 +508,16 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl) up->mcr |= mcr; serial_out(up, UART_MCR, up->mcr); pm_runtime_put(&up->pdev->dev); + + if (gpio_is_valid(up->DTR_gpio) && + !!(mctrl & TIOCM_DTR) != up->DTR_active) { + up->DTR_active = !up->DTR_active; + if (gpio_cansleep(up->DTR_gpio)) + schedule_work(&up->qos_work); + else + gpio_set_value(up->DTR_gpio, + up->DTR_active != up->DTR_inverted); + } } static void serial_omap_break_ctl(struct uart_port *port, int break_state) @@ -715,6 +726,9 @@ static void serial_omap_uart_qos_work(struct work_struct *work) qos_work); pm_qos_update_request(&up->pm_qos_request, up->latency); + if (gpio_is_valid(up->DTR_gpio)) + gpio_set_value_cansleep(up->DTR_gpio, + up->DTR_active != up->DTR_inverted); } static void @@ -1435,7 +1449,7 @@ static int serial_omap_probe(struct platform_device *pdev) struct uart_omap_port *up; struct resource *mem, *irq, *dma_tx, *dma_rx; struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data; - int ret = -ENOSPC; + int ret; if (pdev->dev.of_node) omap_up_info = of_get_uart_port_info(&pdev->dev); @@ -1466,10 +1480,29 @@ static int serial_omap_probe(struct platform_device *pdev) if (!dma_tx) return -ENXIO; + if (gpio_is_valid(omap_up_info->DTR_gpio) && + omap_up_info->DTR_present) { + ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial"); + if (ret < 0) + return ret; + ret = gpio_direction_output(omap_up_info->DTR_gpio, + omap_up_info->DTR_inverted); + if (ret < 0) + return ret; + } + up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); if (!up) return -ENOMEM; + if (gpio_is_valid(omap_up_info->DTR_gpio) && + omap_up_info->DTR_present) { + up->DTR_gpio = omap_up_info->DTR_gpio; + up->DTR_inverted = omap_up_info->DTR_inverted; + } else + up->DTR_gpio = -EINVAL; + up->DTR_active = 0; + up->pdev = pdev; up->port.dev = &pdev->dev; up->port.type = PORT_OMAP; -- 2.39.2