From 2eb5618de87927e540055edc625b22f2d5662ab5 Mon Sep 17 00:00:00 2001 From: Qipan Li Date: Thu, 15 Aug 2013 06:52:15 +0800 Subject: [PATCH] serial: sirf: fix the hardware-flow-ctrl for USP-based UART for USP-based UART, we use two gpios as RTS and CST pins. Signed-off-by: Qipan Li Signed-off-by: Barry Song Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sirfsoc_uart.c | 161 ++++++++++++++++++++++-------- drivers/tty/serial/sirfsoc_uart.h | 6 +- 2 files changed, 122 insertions(+), 45 deletions(-) diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c index d87003d49c05..ed3b89046276 100644 --- a/drivers/tty/serial/sirfsoc_uart.c +++ b/drivers/tty/serial/sirfsoc_uart.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -110,14 +111,19 @@ static unsigned int sirfsoc_uart_get_mctrl(struct uart_port *port) { struct sirfsoc_uart_port *sirfport = to_sirfport(port); struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; - if (!(sirfport->ms_enabled)) { + if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) goto cts_asserted; - } else if (sirfport->hw_flow_ctrl) { + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { if (!(rd_regl(port, ureg->sirfsoc_afc_ctrl) & SIRFUART_AFC_CTS_STATUS)) goto cts_asserted; else goto cts_deasserted; + } else { + if (!gpio_get_value(sirfport->cts_gpio)) + goto cts_asserted; + else + goto cts_deasserted; } cts_deasserted: return TIOCM_CAR | TIOCM_DSR; @@ -132,10 +138,18 @@ static void sirfsoc_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) unsigned int assert = mctrl & TIOCM_RTS; unsigned int val = assert ? SIRFUART_AFC_CTRL_RX_THD : 0x0; unsigned int current_val; - if (sirfport->hw_flow_ctrl) { + + if (!sirfport->hw_flow_ctrl || !sirfport->ms_enabled) + return; + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { current_val = rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0xFF; val |= current_val; wr_regl(port, ureg->sirfsoc_afc_ctrl, val); + } else { + if (!val) + gpio_set_value(sirfport->rts_gpio, 1); + else + gpio_set_value(sirfport->rts_gpio, 0); } } @@ -195,21 +209,32 @@ static void sirfsoc_uart_disable_ms(struct uart_port *port) struct sirfsoc_uart_port *sirfport = to_sirfport(port); struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - unsigned long reg; - sirfport->ms_enabled = 0; if (!sirfport->hw_flow_ctrl) return; - - reg = rd_regl(port, ureg->sirfsoc_afc_ctrl); - wr_regl(port, ureg->sirfsoc_afc_ctrl, reg & ~0x3FF); - if (!sirfport->is_marco) { - reg = rd_regl(port, ureg->sirfsoc_int_en_reg); - wr_regl(port, ureg->sirfsoc_int_en_reg, - reg & ~uint_en->sirfsoc_cts_en); + sirfport->ms_enabled = false; + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { + wr_regl(port, ureg->sirfsoc_afc_ctrl, + rd_regl(port, ureg->sirfsoc_afc_ctrl) & ~0x3FF); + if (!sirfport->is_marco) + wr_regl(port, ureg->sirfsoc_int_en_reg, + rd_regl(port, ureg->sirfsoc_int_en_reg)& + ~uint_en->sirfsoc_cts_en); + else + wr_regl(port, SIRFUART_INT_EN_CLR, + uint_en->sirfsoc_cts_en); } else - wr_regl(port, SIRFUART_INT_EN_CLR, - uint_en->sirfsoc_cts_en); + disable_irq(gpio_to_irq(sirfport->cts_gpio)); +} + +static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id) +{ + struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id; + struct uart_port *port = &sirfport->port; + if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled) + uart_handle_cts_change(port, + !gpio_get_value(sirfport->cts_gpio)); + return IRQ_HANDLED; } static void sirfsoc_uart_enable_ms(struct uart_port *port) @@ -217,25 +242,23 @@ static void sirfsoc_uart_enable_ms(struct uart_port *port) struct sirfsoc_uart_port *sirfport = to_sirfport(port); struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg; struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en; - unsigned long reg; - unsigned long flg; if (!sirfport->hw_flow_ctrl) return; - flg = SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN; - reg = rd_regl(port, ureg->sirfsoc_afc_ctrl); - wr_regl(port, ureg->sirfsoc_afc_ctrl, reg | flg); - if (!sirfport->is_marco) { - reg = rd_regl(port, ureg->sirfsoc_int_en_reg); - wr_regl(port, ureg->sirfsoc_int_en_reg, - reg | uint_en->sirfsoc_cts_en); + sirfport->ms_enabled = true; + if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { + wr_regl(port, ureg->sirfsoc_afc_ctrl, + rd_regl(port, ureg->sirfsoc_afc_ctrl) | + SIRFUART_AFC_TX_EN | SIRFUART_AFC_RX_EN); + if (!sirfport->is_marco) + wr_regl(port, ureg->sirfsoc_int_en_reg, + rd_regl(port, ureg->sirfsoc_int_en_reg) + | uint_en->sirfsoc_cts_en); + else + wr_regl(port, ureg->sirfsoc_int_en_reg, + uint_en->sirfsoc_cts_en); } else - wr_regl(port, ureg->sirfsoc_int_en_reg, - uint_en->sirfsoc_cts_en); - uart_handle_cts_change(port, - !(rd_regl(port, ureg->sirfsoc_afc_ctrl) & - SIRFUART_AFC_CTS_STATUS)); - sirfport->ms_enabled = 1; + enable_irq(gpio_to_irq(sirfport->cts_gpio)); } static void sirfsoc_uart_break_ctl(struct uart_port *port, int break_state) @@ -505,8 +528,7 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, if (termios->c_iflag & INPCK) port->read_status_mask |= uint_en->sirfsoc_frm_err_en | uint_en->sirfsoc_parity_err_en; - } - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) { + } else { if (termios->c_iflag & INPCK) port->read_status_mask |= uint_en->sirfsoc_frm_err_en; } @@ -529,8 +551,7 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, config_reg |= SIRFUART_STICK_BIT_EVEN; } } - } - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) { + } else { if (termios->c_iflag & IGNPAR) port->ignore_status_mask |= uint_en->sirfsoc_frm_err_en; @@ -567,8 +588,7 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, clk_div_reg = sirfsoc_uart_calc_sample_div(baud_rate, ioclk_rate, &set_baud); wr_regl(port, ureg->sirfsoc_divisor, clk_div_reg); - } - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) { + } else { clk_div_reg = sirfsoc_usp_calc_sample_div(baud_rate, ioclk_rate, &sample_div_reg); sample_div_reg--; @@ -593,8 +613,7 @@ static void sirfsoc_uart_set_termios(struct uart_port *port, if (sirfport->uart_reg->uart_type == SIRF_REAL_UART) { config_reg |= SIRFUART_RECV_TIMEOUT(port, rx_time_out); wr_regl(port, ureg->sirfsoc_line_ctrl, config_reg); - } - if (sirfport->uart_reg->uart_type == SIRF_USP_UART) { + } else { /*tx frame ctrl*/ len_val = (data_bit_len - 1) << 0; len_val |= (data_bit_len + 1 + stop_bit_len - 1) << 16; @@ -675,7 +694,25 @@ static int sirfsoc_uart_startup(struct uart_port *port) goto irq_err; } startup_uart_controller(port); + + sirfport->ms_enabled = false; + if (sirfport->uart_reg->uart_type == SIRF_USP_UART && + sirfport->hw_flow_ctrl) { + set_irq_flags(gpio_to_irq(sirfport->cts_gpio), + IRQF_VALID | IRQF_NOAUTOEN); + ret = request_irq(gpio_to_irq(sirfport->cts_gpio), + sirfsoc_uart_usp_cts_handler, IRQF_TRIGGER_FALLING | + IRQF_TRIGGER_RISING, "usp_cts_irq", sirfport); + if (ret != 0) { + dev_err(port->dev, "UART-USP:request gpio irq fail\n"); + goto init_rx_err; + } + } + enable_irq(port->irq); + +init_rx_err: + free_irq(port->irq, sirfport); irq_err: return ret; } @@ -690,9 +727,12 @@ static void sirfsoc_uart_shutdown(struct uart_port *port) wr_regl(port, SIRFUART_INT_EN_CLR, ~0UL); free_irq(port->irq, sirfport); - if (sirfport->ms_enabled) { + if (sirfport->ms_enabled) sirfsoc_uart_disable_ms(port); - sirfport->ms_enabled = 0; + if (sirfport->uart_reg->uart_type == SIRF_USP_UART && + sirfport->hw_flow_ctrl) { + gpio_set_value(sirfport->rts_gpio, 1); + free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport); } } @@ -852,16 +892,51 @@ static int sirfsoc_uart_probe(struct platform_device *pdev) port->private_data = sirfport; sirfport->uart_reg = (struct sirfsoc_uart_register *)match->data; + sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node, + "sirf,uart-has-rtscts"); if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart")) sirfport->uart_reg->uart_type = SIRF_REAL_UART; - if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart")) + if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart")) { sirfport->uart_reg->uart_type = SIRF_USP_UART; + if (!sirfport->hw_flow_ctrl) + goto usp_no_flow_control; + if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL)) + sirfport->cts_gpio = of_get_named_gpio( + pdev->dev.of_node, "cts-gpios", 0); + else + sirfport->cts_gpio = -1; + if (of_find_property(pdev->dev.of_node, "rts-gpios", NULL)) + sirfport->rts_gpio = of_get_named_gpio( + pdev->dev.of_node, "rts-gpios", 0); + else + sirfport->rts_gpio = -1; + + if ((!gpio_is_valid(sirfport->cts_gpio) || + !gpio_is_valid(sirfport->rts_gpio))) { + ret = -EINVAL; + dev_err(&pdev->dev, + "Usp flow control must have rfs and tfs gpio"); + goto err; + } + ret = devm_gpio_request(&pdev->dev, sirfport->cts_gpio, + "usp-rfs-gpio"); + if (ret) { + dev_err(&pdev->dev, "Unable request rfs gpio"); + goto err; + } + gpio_direction_input(sirfport->cts_gpio); + ret = devm_gpio_request(&pdev->dev, sirfport->rts_gpio, + "usp-tfs-gpio"); + if (ret) { + dev_err(&pdev->dev, "Unable request tfs gpio"); + goto err; + } + gpio_direction_output(sirfport->rts_gpio, 1); + } +usp_no_flow_control: if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-uart")) sirfport->is_marco = true; - if (of_find_property(pdev->dev.of_node, "hw_flow_ctrl", NULL)) - sirfport->hw_flow_ctrl = 1; - if (of_property_read_u32(pdev->dev.of_node, "fifosize", &port->fifosize)) { diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h index 2b41b06362df..e87035a9bbcb 100644 --- a/drivers/tty/serial/sirfsoc_uart.h +++ b/drivers/tty/serial/sirfsoc_uart.h @@ -363,14 +363,16 @@ struct sirfsoc_baudrate_to_regv { }; struct sirfsoc_uart_port { - unsigned char hw_flow_ctrl; - unsigned char ms_enabled; + bool hw_flow_ctrl; + bool ms_enabled; struct uart_port port; struct clk *clk; /* for SiRFmarco, there are SET/CLR for UART_INT_EN */ bool is_marco; struct sirfsoc_uart_register *uart_reg; + unsigned int cts_gpio; + unsigned int rts_gpio; }; /* Hardware Flow Control */ -- 2.20.1