The patch updates mxs-auart driver to use new mctrl_gpio helpers for gpio irqs. The code is much simpler now.
Signed-off-by: Janusz Uzycki <[email protected]> --- Changes since RFC v2: - fixed comments in *_ms functions to match the coding style (credits to Uwe Kleine-König) - rebased to next-20150204 --- drivers/tty/serial/mxs-auart.c | 137 +++++------------------------------------ 1 file changed, 17 insertions(+), 120 deletions(-) diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index d1298b6..5a8cf2c 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -149,7 +149,6 @@ struct mxs_auart_port { #define MXS_AUART_DMA_RX_READY 3 /* bit 3 */ #define MXS_AUART_RTSCTS 4 /* bit 4 */ unsigned long flags; - unsigned int mctrl_prev; enum mxs_auart_type devtype; struct clk *clk; @@ -165,7 +164,6 @@ struct mxs_auart_port { void *rx_dma_buf; struct mctrl_gpios *gpios; - int gpio_irq[UART_GPIO_MAX]; bool ms_irq_enabled; }; @@ -431,29 +429,6 @@ static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl) mctrl_gpio_set(s->gpios, mctrl); } -#define MCTRL_ANY_DELTA (TIOCM_RI | TIOCM_DSR | TIOCM_CD | TIOCM_CTS) -static u32 mxs_auart_modem_status(struct mxs_auart_port *s, u32 mctrl) -{ - u32 mctrl_diff; - - mctrl_diff = mctrl ^ s->mctrl_prev; - s->mctrl_prev = mctrl; - if (mctrl_diff & MCTRL_ANY_DELTA && s->ms_irq_enabled && - s->port.state != NULL) { - if (mctrl_diff & TIOCM_RI) - s->port.icount.rng++; - if (mctrl_diff & TIOCM_DSR) - s->port.icount.dsr++; - if (mctrl_diff & TIOCM_CD) - uart_handle_dcd_change(&s->port, mctrl & TIOCM_CD); - if (mctrl_diff & TIOCM_CTS) - uart_handle_cts_change(&s->port, mctrl & TIOCM_CTS); - - wake_up_interruptible(&s->port.state->port.delta_msr_wait); - } - return mctrl; -} - static u32 mxs_auart_get_mctrl(struct uart_port *u) { struct mxs_auart_port *s = to_auart_port(u); @@ -481,18 +456,11 @@ static void mxs_auart_enable_ms(struct uart_port *port) s->ms_irq_enabled = true; - if (s->gpio_irq[UART_GPIO_CTS] >= 0) - enable_irq(s->gpio_irq[UART_GPIO_CTS]); - /* TODO: enable AUART_INTR_CTSMIEN otherwise */ - - if (s->gpio_irq[UART_GPIO_DSR] >= 0) - enable_irq(s->gpio_irq[UART_GPIO_DSR]); - - if (s->gpio_irq[UART_GPIO_RI] >= 0) - enable_irq(s->gpio_irq[UART_GPIO_RI]); - - if (s->gpio_irq[UART_GPIO_DCD] >= 0) - enable_irq(s->gpio_irq[UART_GPIO_DCD]); + mctrl_gpio_enable_ms(s->gpios); + /* + * TODO: enable AUART_INTR_CTSMIEN if CTS isn't handled by + * mctrl_gpio. + */ } /* @@ -510,18 +478,11 @@ static void mxs_auart_disable_ms(struct uart_port *port) s->ms_irq_enabled = false; - if (s->gpio_irq[UART_GPIO_CTS] >= 0) - disable_irq(s->gpio_irq[UART_GPIO_CTS]); - /* TODO: disable AUART_INTR_CTSMIEN otherwise */ - - if (s->gpio_irq[UART_GPIO_DSR] >= 0) - disable_irq(s->gpio_irq[UART_GPIO_DSR]); - - if (s->gpio_irq[UART_GPIO_RI] >= 0) - disable_irq(s->gpio_irq[UART_GPIO_RI]); - - if (s->gpio_irq[UART_GPIO_DCD] >= 0) - disable_irq(s->gpio_irq[UART_GPIO_DCD]); + mctrl_gpio_disable_ms(s->gpios); + /* + * TODO: disable AUART_INTR_CTSMIEN if CTS isn't handled by + * mctrl_gpio. + */ } static int mxs_auart_dma_prep_rx(struct mxs_auart_port *s); @@ -797,7 +758,6 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context) { u32 istat; struct mxs_auart_port *s = context; - u32 mctrl_temp = s->mctrl_prev; u32 stat = readl(s->port.membase + AUART_STAT); istat = readl(s->port.membase + AUART_INTR); @@ -809,16 +769,6 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context) | AUART_INTR_CTSMIS), s->port.membase + AUART_INTR_CLR); - /* - * Dealing with GPIO interrupt - */ - if (irq == s->gpio_irq[UART_GPIO_CTS] || - irq == s->gpio_irq[UART_GPIO_DCD] || - irq == s->gpio_irq[UART_GPIO_DSR] || - irq == s->gpio_irq[UART_GPIO_RI]) - mxs_auart_modem_status(s, - mctrl_gpio_get(s->gpios, &mctrl_temp)); - if (istat & AUART_INTR_CTSMIS) { if (CTS_AT_AUART() && s->ms_irq_enabled) uart_handle_cts_change(&s->port, @@ -883,9 +833,6 @@ static int mxs_auart_startup(struct uart_port *u) */ writel(AUART_LINECTRL_FEN, u->membase + AUART_LINECTRL_SET); - /* get initial status of modem lines */ - mctrl_gpio_get(s->gpios, &s->mctrl_prev); - s->ms_irq_enabled = false; return 0; } @@ -1155,71 +1102,23 @@ static int serial_mxs_probe_dt(struct mxs_auart_port *s, return 0; } -static bool mxs_auart_init_gpios(struct mxs_auart_port *s, struct device *dev) +static bool mxs_auart_init_gpios(struct mxs_auart_port *s) { - enum mctrl_gpio_idx i; - struct gpio_desc *gpiod; - - s->gpios = mctrl_gpio_init(dev, 0); + s->gpios = mctrl_gpio_init_dt(&s->port, 0); if (IS_ERR_OR_NULL(s->gpios)) return false; /* Block (enabled before) DMA option if RTS or CTS is GPIO line */ if (!RTS_AT_AUART() || !CTS_AT_AUART()) { if (test_bit(MXS_AUART_RTSCTS, &s->flags)) - dev_warn(dev, + dev_warn(s->dev, "DMA and flow control via gpio may cause some problems. DMA disabled!\n"); clear_bit(MXS_AUART_RTSCTS, &s->flags); } - for (i = 0; i < UART_GPIO_MAX; i++) { - gpiod = mctrl_gpio_to_gpiod(s->gpios, i); - if (gpiod && (gpiod_get_direction(gpiod) == GPIOF_DIR_IN)) - s->gpio_irq[i] = gpiod_to_irq(gpiod); - else - s->gpio_irq[i] = -EINVAL; - } - return true; } -static void mxs_auart_free_gpio_irq(struct mxs_auart_port *s) -{ - enum mctrl_gpio_idx i; - - for (i = 0; i < UART_GPIO_MAX; i++) - if (s->gpio_irq[i] >= 0) - free_irq(s->gpio_irq[i], s); -} - -static int mxs_auart_request_gpio_irq(struct mxs_auart_port *s) -{ - int *irq = s->gpio_irq; - enum mctrl_gpio_idx i; - int err = 0; - - for (i = 0; (i < UART_GPIO_MAX) && !err; i++) { - if (irq[i] < 0) - continue; - - irq_set_status_flags(irq[i], IRQ_NOAUTOEN); - err = request_irq(irq[i], mxs_auart_irq_handle, - IRQ_TYPE_EDGE_BOTH, dev_name(s->dev), s); - if (err) - dev_err(s->dev, "%s - Can't get %d irq\n", - __func__, irq[i]); - } - - /* - * If something went wrong, rollback. - */ - while (err && (--i >= 0)) - if (irq[i] >= 0) - free_irq(irq[i], s); - - return err; -} - static int mxs_auart_probe(struct platform_device *pdev) { const struct of_device_id *of_id = @@ -1262,8 +1161,6 @@ static int mxs_auart_probe(struct platform_device *pdev) s->port.type = PORT_IMX; s->port.dev = s->dev = &pdev->dev; - s->mctrl_prev = 0; - irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; @@ -1276,14 +1173,14 @@ static int mxs_auart_probe(struct platform_device *pdev) platform_set_drvdata(pdev, s); - if (!mxs_auart_init_gpios(s, &pdev->dev)) + if (!mxs_auart_init_gpios(s)) dev_err(&pdev->dev, "Failed to initialize GPIOs. The serial port may not work as expected\n"); /* * Get the GPIO lines IRQ */ - ret = mxs_auart_request_gpio_irq(s); + ret = mctrl_gpio_request_irqs(s->gpios); if (ret) return ret; @@ -1303,7 +1200,7 @@ static int mxs_auart_probe(struct platform_device *pdev) return 0; out_free_gpio_irq: - mxs_auart_free_gpio_irq(s); + mctrl_gpio_free_irqs(s->gpios); auart_port[pdev->id] = NULL; return ret; } @@ -1314,7 +1211,7 @@ static int mxs_auart_remove(struct platform_device *pdev) uart_remove_one_port(&auart_driver, &s->port); auart_port[pdev->id] = NULL; - mxs_auart_free_gpio_irq(s); + mctrl_gpio_free_irqs(s->gpios); return 0; } -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
