NOT COMPLETE NYET-Signed-off-by: Felipe Balbi <balbi@xxxxxx> --- drivers/tty/serial/8250/8250_omap.c | 233 ++++++++++++++++++++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 7 ++ drivers/tty/serial/8250/Makefile | 1 + 3 files changed, 241 insertions(+) create mode 100644 drivers/tty/serial/8250/8250_omap.c diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c new file mode 100644 index 0000000..e8ae479 --- /dev/null +++ b/drivers/tty/serial/8250/8250_omap.c @@ -0,0 +1,233 @@ +/* + * 8250-omap.c - OMAP adaptation for 8250 driver + * + * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com + * + * Author: Felipe Balbi <balbi@xxxxxx> + * + * Based on omap-serial.c: + * + * Copyright (C) 2010 Texas Instruments + * + * Authors: + * Govindraj R <govindraj.raja@xxxxxx> + * Thara Gopinath <thara@xxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Note: This driver is made separate from 8250 driver as we cannot + * over load 8250 driver with omap platform specific configuration for + * features like DMA, it makes easier to implement features like DMA and + * hardware flow control and software flow control configuration with + * this driver as required for the omap-platform. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/serial_8250.h> +#include <linux/serial_core.h> +#include <linux/serial_reg.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_gpio.h> +#include <linux/platform_data/serial-omap.h> + +#include <dt-bindings/gpio/gpio.h> + +#define OMAP_MAX_HSUART_PORTS 6 + +#define UART_BUILD_REVISION(x, y) (((x) << 8) | (y)) + +#define OMAP_UART_REV_42 0x0402 +#define OMAP_UART_REV_46 0x0406 +#define OMAP_UART_REV_52 0x0502 +#define OMAP_UART_REV_63 0x0603 + +#define OMAP_UART_TX_WAKEUP_EN BIT(7) + +/* Feature flags */ +#define OMAP_UART_WER_HAS_TX_WAKEUP BIT(0) + +#define UART_ERRATA_i202_MDR1_ACCESS BIT(0) +#define UART_ERRATA_i291_DMA_FORCEIDLE BIT(1) + +#define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/ + +/* SCR register bitmasks */ +#define OMAP_UART_SCR_RX_TRIG_GRANU1_MASK (1 << 7) +#define OMAP_UART_SCR_TX_TRIG_GRANU1_MASK (1 << 6) +#define OMAP_UART_SCR_TX_EMPTY (1 << 3) + +/* FCR register bitmasks */ +#define OMAP_UART_FCR_RX_FIFO_TRIG_MASK (0x3 << 6) +#define OMAP_UART_FCR_TX_FIFO_TRIG_MASK (0x3 << 4) + +/* MVR register bitmasks */ +#define OMAP_UART_MVR_SCHEME_SHIFT 30 + +#define OMAP_UART_LEGACY_MVR_MAJ_MASK 0xf0 +#define OMAP_UART_LEGACY_MVR_MAJ_SHIFT 4 +#define OMAP_UART_LEGACY_MVR_MIN_MASK 0x0f + +#define OMAP_UART_MVR_MAJ_MASK 0x700 +#define OMAP_UART_MVR_MAJ_SHIFT 8 +#define OMAP_UART_MVR_MIN_MASK 0x3f + +#define OMAP_UART_DMA_CH_FREE -1 + +#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA +#define OMAP_MODE13X_SPEED 230400 + +/* WER = 0x7F + * Enable module level wakeup in WER reg + */ +#define OMAP_UART_WER_MOD_WKUP 0X7F + +/* Enable XON/XOFF flow control on output */ +#define OMAP_UART_SW_TX 0x08 + +/* Enable XON/XOFF flow control on input */ +#define OMAP_UART_SW_RX 0x02 + +#define OMAP_UART_SW_CLR 0xF0 + +#define OMAP_UART_TCR_TRIG 0x0F + +struct uart_omap_port { + struct uart_8250_port uart; + struct device *dev; + int wakeirq; + + unsigned char ier; + unsigned char lcr; + unsigned char mcr; + unsigned char fcr; + unsigned char efr; + unsigned char dll; + unsigned char dlh; + unsigned char mdr1; + unsigned char scr; + unsigned char wer; + + int line; + + /* + * Some bits in registers are cleared on a read, so they must + * be saved whenever the register is read but the bits will not + * be immediately processed. + */ + unsigned int lsr_break_flag; + unsigned char msr_saved_flags; + char name[20]; + unsigned long port_activity; + int context_loss_cnt; + u32 errata; + u8 wakeups_enabled; + u32 features; +}; + +#define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) + +static int serial_omap_probe(struct platform_device *pdev) +{ + struct uart_omap_port *up; + struct resource *mem; + void __iomem *base; + int uartirq = 0; + int ret; + + if (!pdev->dev.of_node) + return -ENODEV; + + uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0); + if (!uartirq) + return -EPROBE_DEFER; + + up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL); + if (!up) + return -ENOMEM; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(base)) + return PTR_ERR(base); + + up->dev = &pdev->dev; + up->uart.port.mapbase = mem->start; + up->uart.port.membase = base; + up->uart.port.irq = uartirq; + up->uart.port.dev = &pdev->dev; + up->uart.port.type = PORT_16750; + up->uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT; + up->uart.port.iotype = UPIO_MEM; + + if (of_property_read_u32(pdev->dev.of_node, "clock-frequency", + &up->uart.port.uartclk)) { + up->uart.port.uartclk = DEFAULT_CLK_SPEED; + dev_warn(&pdev->dev, + "No clock speed specified: using default: %d\n", + DEFAULT_CLK_SPEED); + } + + platform_set_drvdata(pdev, up); + + device_init_wakeup(up->dev, true); + pm_runtime_irq_safe(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + + ret = serial8250_register_8250_port(&up->uart); + if (ret < 0) + goto err_add_port; + + up->line = ret; + + return 0; + +err_add_port: + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n", + pdev->id, __func__, ret); + return ret; +} + +static int serial_omap_remove(struct platform_device *dev) +{ + struct uart_omap_port *up = platform_get_drvdata(dev); + + serial8250_unregister_port(up->line); + + pm_runtime_put_sync(up->dev); + pm_runtime_disable(up->dev); + + return 0; +} + +static const struct of_device_id omap_serial_of_match[] = { + { .compatible = "ti,am335x-uart" }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap_serial_of_match); + +static struct platform_driver serial_omap_driver = { + .probe = serial_omap_probe, + .remove = serial_omap_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = of_match_ptr(omap_serial_of_match), + }, +}; + +module_platform_driver(serial_omap_driver); + +MODULE_DESCRIPTION("OMAP High Speed UART driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Texas Instruments Incorporated"); diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index 2332991..ad092d5 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -287,6 +287,13 @@ config SERIAL_8250_DW Selecting this option will enable handling of the extra features present in the Synopsys DesignWare APB UART. +config SERIAL_8250_OMAP + tristate "Support for OMAP 8250 quirks" + depends on SERIAL_8250 + help + Selecting this option will enable handling of the extra features + present in the TI OMAP UART. + config SERIAL_8250_EM tristate "Support for Emma Mobile integrated serial port" depends on SERIAL_8250 && ARM && HAVE_CLK diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index 36d68d0..0119a11 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -19,4 +19,5 @@ obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o +obj-$(CONFIG_SERIAL_8250_OMAP) += 8250_omap.o obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o -- 1.9.2.459.g68773ac -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
