diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_dw.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 93 |
1 files changed, 66 insertions, 27 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index e60116235836..176f18f2e3ab 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -17,7 +17,6 @@ #include <linux/io.h> #include <linux/module.h> #include <linux/serial_8250.h> -#include <linux/serial_core.h> #include <linux/serial_reg.h> #include <linux/of.h> #include <linux/of_irq.h> @@ -59,6 +58,8 @@ struct dw8250_data { u8 usr_reg; int last_mcr; int line; + int msr_mask_on; + int msr_mask_off; struct clk *clk; struct clk *pclk; struct reset_control *rst; @@ -81,6 +82,12 @@ static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value) value &= ~UART_MSR_DCTS; } + /* Override any modem control signals if needed */ + if (offset == UART_MSR) { + value |= d->msr_mask_on; + value &= ~d->msr_mask_off; + } + return value; } @@ -111,7 +118,10 @@ static void dw8250_serial_out(struct uart_port *p, int offset, int value) dw8250_force_idle(p); writeb(value, p->membase + (UART_LCR << p->regshift)); } - dev_err(p->dev, "Couldn't set LCR to %d\n", value); + /* + * FIXME: this deadlocks if port->lock is already held + * dev_err(p->dev, "Couldn't set LCR to %d\n", value); + */ } } @@ -155,7 +165,10 @@ static void dw8250_serial_outq(struct uart_port *p, int offset, int value) __raw_writeq(value & 0xff, p->membase + (UART_LCR << p->regshift)); } - dev_err(p->dev, "Couldn't set LCR to %d\n", value); + /* + * FIXME: this deadlocks if port->lock is already held + * dev_err(p->dev, "Couldn't set LCR to %d\n", value); + */ } } #endif /* CONFIG_64BIT */ @@ -179,7 +192,10 @@ static void dw8250_serial_out32(struct uart_port *p, int offset, int value) dw8250_force_idle(p); writel(value, p->membase + (UART_LCR << p->regshift)); } - dev_err(p->dev, "Couldn't set LCR to %d\n", value); + /* + * FIXME: this deadlocks if port->lock is already held + * dev_err(p->dev, "Couldn't set LCR to %d\n", value); + */ } } @@ -334,16 +350,29 @@ static int dw8250_probe_of(struct uart_port *p, if (id >= 0) p->line = id; - /* clock got configured through clk api, all done */ - if (p->uartclk) - return 0; + if (of_property_read_bool(np, "dcd-override")) { + /* Always report DCD as active */ + data->msr_mask_on |= UART_MSR_DCD; + data->msr_mask_off |= UART_MSR_DDCD; + } - /* try to find out clock frequency from DT as fallback */ - if (of_property_read_u32(np, "clock-frequency", &val)) { - dev_err(p->dev, "clk or clock-frequency not defined\n"); - return -EINVAL; + if (of_property_read_bool(np, "dsr-override")) { + /* Always report DSR as active */ + data->msr_mask_on |= UART_MSR_DSR; + data->msr_mask_off |= UART_MSR_DDSR; + } + + if (of_property_read_bool(np, "cts-override")) { + /* Always report CTS as active */ + data->msr_mask_on |= UART_MSR_CTS; + data->msr_mask_off |= UART_MSR_DCTS; + } + + if (of_property_read_bool(np, "ri-override")) { + /* Always report Ring indicator as inactive */ + data->msr_mask_off |= UART_MSR_RI; + data->msr_mask_off |= UART_MSR_TERI; } - p->uartclk = val; return 0; } @@ -351,20 +380,10 @@ static int dw8250_probe_of(struct uart_port *p, static int dw8250_probe_acpi(struct uart_8250_port *up, struct dw8250_data *data) { - const struct acpi_device_id *id; struct uart_port *p = &up->port; dw8250_setup_port(up); - id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev); - if (!id) - return -ENODEV; - - if (!p->uartclk) - if (device_property_read_u32(p->dev, "clock-frequency", - &p->uartclk)) - return -EINVAL; - p->iotype = UPIO_MEM32; p->serial_in = dw8250_serial_in32; p->serial_out = dw8250_serial_out32; @@ -384,18 +403,24 @@ static int dw8250_probe(struct platform_device *pdev) { struct uart_8250_port uart = {}; struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); - struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + int irq = platform_get_irq(pdev, 0); struct dw8250_data *data; int err; - if (!regs || !irq) { - dev_err(&pdev->dev, "no registers/irq defined\n"); + if (!regs) { + dev_err(&pdev->dev, "no registers defined\n"); return -EINVAL; } + if (irq < 0) { + if (irq != -EPROBE_DEFER) + dev_err(&pdev->dev, "cannot get irq\n"); + return irq; + } + spin_lock_init(&uart.port.lock); uart.port.mapbase = regs->start; - uart.port.irq = irq->start; + uart.port.irq = irq; uart.port.handle_irq = dw8250_handle_irq; uart.port.pm = dw8250_do_pm; uart.port.type = PORT_8250; @@ -412,12 +437,18 @@ static int dw8250_probe(struct platform_device *pdev) return -ENOMEM; data->usr_reg = DW_UART_USR; + + /* Always ask for fixed clock rate from a property. */ + device_property_read_u32(&pdev->dev, "clock-frequency", + &uart.port.uartclk); + + /* If there is separate baudclk, get the rate from it. */ data->clk = devm_clk_get(&pdev->dev, "baudclk"); if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER) data->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) return -EPROBE_DEFER; - if (!IS_ERR(data->clk)) { + if (!IS_ERR_OR_NULL(data->clk)) { err = clk_prepare_enable(data->clk); if (err) dev_warn(&pdev->dev, "could not enable optional baudclk: %d\n", @@ -426,6 +457,12 @@ static int dw8250_probe(struct platform_device *pdev) uart.port.uartclk = clk_get_rate(data->clk); } + /* If no clock rate is defined, fail. */ + if (!uart.port.uartclk) { + dev_err(&pdev->dev, "clock rate not defined\n"); + return -EINVAL; + } + data->pclk = devm_clk_get(&pdev->dev, "apb_pclk"); if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) { err = -EPROBE_DEFER; @@ -588,6 +625,7 @@ static const struct acpi_device_id dw8250_acpi_match[] = { { "80860F0A", 0 }, { "8086228A", 0 }, { "APMC0D08", 0}, + { "AMD0020", 0 }, { }, }; MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match); @@ -608,3 +646,4 @@ module_platform_driver(dw8250_platform_driver); MODULE_AUTHOR("Jamie Iles"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Synopsys DesignWare 8250 serial port driver"); +MODULE_ALIAS("platform:dw-apb-uart"); |