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tty: serial: add Freescale lpuart driver support
Add Freescale lpuart driver support. The lpuart device can be found on Vybrid VF610 and Layerscape LS-1 SoCs. Signed-off-by: Jingchang Lu <b35083@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jingchang Lu
Greg Kroah-Hartman
parent
1ba7055af2
commit
c9e2e946fb
14
Documentation/devicetree/bindings/tty/serial/fsl-lpuart.txt
Normal file
14
Documentation/devicetree/bindings/tty/serial/fsl-lpuart.txt
Normal file
@ -0,0 +1,14 @@
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* Freescale low power universal asynchronous receiver/transmitter (lpuart)
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Required properties:
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- compatible : Should be "fsl,<soc>-lpuart"
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- reg : Address and length of the register set for the device
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- interrupts : Should contain uart interrupt
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Example:
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uart0: serial@40027000 {
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compatible = "fsl,vf610-lpuart";
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reg = <0x40027000 0x1000>;
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interrupts = <0 61 0x00>;
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};
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@ -1483,6 +1483,20 @@ config SERIAL_RP2_NR_UARTS
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If multiple cards are present, the default limit of 32 ports may
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need to be increased.
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config SERIAL_FSL_LPUART
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tristate "Freescale lpuart serial port support"
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select SERIAL_CORE
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help
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Support for the on-chip lpuart on some Freescale SOCs.
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config SERIAL_FSL_LPUART_CONSOLE
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bool "Console on Freescale lpuart serial port"
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depends on SERIAL_FSL_LPUART=y
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select SERIAL_CORE_CONSOLE
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help
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If you have enabled the lpuart serial port on the Freescale SoCs,
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you can make it the console by answering Y to this option.
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endmenu
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endif # TTY
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@ -85,3 +85,4 @@ obj-$(CONFIG_SERIAL_AR933X) += ar933x_uart.o
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obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o
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obj-$(CONFIG_SERIAL_ARC) += arc_uart.o
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obj-$(CONFIG_SERIAL_RP2) += rp2.o
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obj-$(CONFIG_SERIAL_FSL_LPUART) += fsl_lpuart.o
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874
drivers/tty/serial/fsl_lpuart.c
Normal file
874
drivers/tty/serial/fsl_lpuart.c
Normal file
@ -0,0 +1,874 @@
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/*
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* Freescale lpuart serial port driver
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*
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* Copyright 2012-2013 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#if defined(CONFIG_SERIAL_FSL_LPUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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#endif
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/console.h>
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#include <linux/serial_core.h>
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#include <linux/tty_flip.h>
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/* All registers are 8-bit width */
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#define UARTBDH 0x00
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#define UARTBDL 0x01
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#define UARTCR1 0x02
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#define UARTCR2 0x03
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#define UARTSR1 0x04
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#define UARTCR3 0x06
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#define UARTDR 0x07
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#define UARTCR4 0x0a
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#define UARTCR5 0x0b
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#define UARTMODEM 0x0d
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#define UARTPFIFO 0x10
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#define UARTCFIFO 0x11
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#define UARTSFIFO 0x12
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#define UARTTWFIFO 0x13
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#define UARTTCFIFO 0x14
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#define UARTRWFIFO 0x15
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#define UARTBDH_LBKDIE 0x80
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#define UARTBDH_RXEDGIE 0x40
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#define UARTBDH_SBR_MASK 0x1f
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#define UARTCR1_LOOPS 0x80
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#define UARTCR1_RSRC 0x20
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#define UARTCR1_M 0x10
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#define UARTCR1_WAKE 0x08
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#define UARTCR1_ILT 0x04
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#define UARTCR1_PE 0x02
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#define UARTCR1_PT 0x01
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#define UARTCR2_TIE 0x80
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#define UARTCR2_TCIE 0x40
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#define UARTCR2_RIE 0x20
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#define UARTCR2_ILIE 0x10
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#define UARTCR2_TE 0x08
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#define UARTCR2_RE 0x04
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#define UARTCR2_RWU 0x02
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#define UARTCR2_SBK 0x01
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#define UARTSR1_TDRE 0x80
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#define UARTSR1_TC 0x40
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#define UARTSR1_RDRF 0x20
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#define UARTSR1_IDLE 0x10
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#define UARTSR1_OR 0x08
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#define UARTSR1_NF 0x04
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#define UARTSR1_FE 0x02
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#define UARTSR1_PE 0x01
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#define UARTCR3_R8 0x80
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#define UARTCR3_T8 0x40
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#define UARTCR3_TXDIR 0x20
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#define UARTCR3_TXINV 0x10
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#define UARTCR3_ORIE 0x08
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#define UARTCR3_NEIE 0x04
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#define UARTCR3_FEIE 0x02
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#define UARTCR3_PEIE 0x01
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#define UARTCR4_MAEN1 0x80
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#define UARTCR4_MAEN2 0x40
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#define UARTCR4_M10 0x20
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#define UARTCR4_BRFA_MASK 0x1f
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#define UARTCR4_BRFA_OFF 0
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#define UARTCR5_TDMAS 0x80
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#define UARTCR5_RDMAS 0x20
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#define UARTMODEM_RXRTSE 0x08
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#define UARTMODEM_TXRTSPOL 0x04
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#define UARTMODEM_TXRTSE 0x02
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#define UARTMODEM_TXCTSE 0x01
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#define UARTPFIFO_TXFE 0x80
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#define UARTPFIFO_FIFOSIZE_MASK 0x7
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#define UARTPFIFO_TXSIZE_OFF 4
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#define UARTPFIFO_RXFE 0x08
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#define UARTPFIFO_RXSIZE_OFF 0
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#define UARTCFIFO_TXFLUSH 0x80
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#define UARTCFIFO_RXFLUSH 0x40
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#define UARTCFIFO_RXOFE 0x04
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#define UARTCFIFO_TXOFE 0x02
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#define UARTCFIFO_RXUFE 0x01
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#define UARTSFIFO_TXEMPT 0x80
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#define UARTSFIFO_RXEMPT 0x40
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#define UARTSFIFO_RXOF 0x04
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#define UARTSFIFO_TXOF 0x02
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#define UARTSFIFO_RXUF 0x01
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#define DRIVER_NAME "fsl-lpuart"
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#define DEV_NAME "ttyLP"
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#define UART_NR 6
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struct lpuart_port {
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struct uart_port port;
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struct clk *clk;
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unsigned int txfifo_size;
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unsigned int rxfifo_size;
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};
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static struct of_device_id lpuart_dt_ids[] = {
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{
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.compatible = "fsl,vf610-lpuart",
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
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static void lpuart_stop_tx(struct uart_port *port)
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{
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unsigned char temp;
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temp = readb(port->membase + UARTCR2);
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temp &= ~(UARTCR2_TIE | UARTCR2_TCIE);
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writeb(temp, port->membase + UARTCR2);
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}
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static void lpuart_stop_rx(struct uart_port *port)
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{
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unsigned char temp;
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temp = readb(port->membase + UARTCR2);
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writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2);
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}
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static void lpuart_enable_ms(struct uart_port *port)
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{
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}
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static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
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{
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struct circ_buf *xmit = &sport->port.state->xmit;
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while (!uart_circ_empty(xmit) &&
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(readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size)) {
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writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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sport->port.icount.tx++;
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}
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&sport->port);
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if (uart_circ_empty(xmit))
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lpuart_stop_tx(&sport->port);
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}
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static void lpuart_start_tx(struct uart_port *port)
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{
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struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
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unsigned char temp;
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temp = readb(port->membase + UARTCR2);
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writeb(temp | UARTCR2_TIE, port->membase + UARTCR2);
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if (readb(port->membase + UARTSR1) & UARTSR1_TDRE)
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lpuart_transmit_buffer(sport);
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}
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static irqreturn_t lpuart_txint(int irq, void *dev_id)
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{
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struct lpuart_port *sport = dev_id;
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struct circ_buf *xmit = &sport->port.state->xmit;
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unsigned long flags;
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spin_lock_irqsave(&sport->port.lock, flags);
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if (sport->port.x_char) {
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writeb(sport->port.x_char, sport->port.membase + UARTDR);
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goto out;
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}
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if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
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lpuart_stop_tx(&sport->port);
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goto out;
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}
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lpuart_transmit_buffer(sport);
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(&sport->port);
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out:
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spin_unlock_irqrestore(&sport->port.lock, flags);
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return IRQ_HANDLED;
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}
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static irqreturn_t lpuart_rxint(int irq, void *dev_id)
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{
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struct lpuart_port *sport = dev_id;
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unsigned int flg, ignored = 0;
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struct tty_port *port = &sport->port.state->port;
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unsigned long flags;
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unsigned char rx, sr;
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spin_lock_irqsave(&sport->port.lock, flags);
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while (!(readb(sport->port.membase + UARTSFIFO) & UARTSFIFO_RXEMPT)) {
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flg = TTY_NORMAL;
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sport->port.icount.rx++;
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/*
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* to clear the FE, OR, NF, FE, PE flags,
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* read SR1 then read DR
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*/
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sr = readb(sport->port.membase + UARTSR1);
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rx = readb(sport->port.membase + UARTDR);
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if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
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continue;
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if (sr & (UARTSR1_PE | UARTSR1_OR | UARTSR1_FE)) {
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if (sr & UARTSR1_PE)
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sport->port.icount.parity++;
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else if (sr & UARTSR1_FE)
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sport->port.icount.frame++;
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if (sr & UARTSR1_OR)
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sport->port.icount.overrun++;
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if (sr & sport->port.ignore_status_mask) {
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if (++ignored > 100)
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goto out;
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continue;
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}
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sr &= sport->port.read_status_mask;
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if (sr & UARTSR1_PE)
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flg = TTY_PARITY;
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else if (sr & UARTSR1_FE)
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flg = TTY_FRAME;
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if (sr & UARTSR1_OR)
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flg = TTY_OVERRUN;
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#ifdef SUPPORT_SYSRQ
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sport->port.sysrq = 0;
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#endif
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}
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tty_insert_flip_char(port, rx, flg);
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}
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out:
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spin_unlock_irqrestore(&sport->port.lock, flags);
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tty_flip_buffer_push(port);
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return IRQ_HANDLED;
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}
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static irqreturn_t lpuart_int(int irq, void *dev_id)
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{
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struct lpuart_port *sport = dev_id;
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unsigned char sts;
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sts = readb(sport->port.membase + UARTSR1);
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if (sts & UARTSR1_RDRF)
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lpuart_rxint(irq, dev_id);
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if (sts & UARTSR1_TDRE &&
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!(readb(sport->port.membase + UARTCR5) & UARTCR5_TDMAS))
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lpuart_txint(irq, dev_id);
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return IRQ_HANDLED;
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}
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/* return TIOCSER_TEMT when transmitter is not busy */
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static unsigned int lpuart_tx_empty(struct uart_port *port)
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{
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return (readb(port->membase + UARTSR1) & UARTSR1_TC) ?
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TIOCSER_TEMT : 0;
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}
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static unsigned int lpuart_get_mctrl(struct uart_port *port)
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{
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unsigned int temp = 0;
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unsigned char reg;
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reg = readb(port->membase + UARTMODEM);
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if (reg & UARTMODEM_TXCTSE)
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temp |= TIOCM_CTS;
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if (reg & UARTMODEM_RXRTSE)
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temp |= TIOCM_RTS;
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return temp;
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}
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static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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unsigned char temp;
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temp = readb(port->membase + UARTMODEM) &
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~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
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if (mctrl & TIOCM_RTS)
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temp |= UARTMODEM_RXRTSE;
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if (mctrl & TIOCM_CTS)
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temp |= UARTMODEM_TXCTSE;
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writeb(temp, port->membase + UARTMODEM);
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}
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static void lpuart_break_ctl(struct uart_port *port, int break_state)
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{
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unsigned char temp;
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temp = readb(port->membase + UARTCR2) & ~UARTCR2_SBK;
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if (break_state != 0)
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temp |= UARTCR2_SBK;
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writeb(temp, port->membase + UARTCR2);
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}
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static void lpuart_setup_watermark(struct lpuart_port *sport)
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{
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unsigned char val, cr2;
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cr2 = readb(sport->port.membase + UARTCR2);
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cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE |
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UARTCR2_RIE | UARTCR2_RE);
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writeb(cr2, sport->port.membase + UARTCR2);
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/* determine FIFO size and enable FIFO mode */
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val = readb(sport->port.membase + UARTPFIFO);
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sport->txfifo_size = 0x1 << (((val >> UARTPFIFO_TXSIZE_OFF) &
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UARTPFIFO_FIFOSIZE_MASK) + 1);
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sport->rxfifo_size = 0x1 << (((val >> UARTPFIFO_RXSIZE_OFF) &
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UARTPFIFO_FIFOSIZE_MASK) + 1);
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writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
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sport->port.membase + UARTPFIFO);
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/* flush Tx and Rx FIFO */
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writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH,
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sport->port.membase + UARTCFIFO);
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writeb(2, sport->port.membase + UARTTWFIFO);
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writeb(1, sport->port.membase + UARTRWFIFO);
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}
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static int lpuart_startup(struct uart_port *port)
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{
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struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
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int ret;
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unsigned long flags;
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unsigned char temp;
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ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0,
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DRIVER_NAME, sport);
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if (ret)
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return ret;
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spin_lock_irqsave(&sport->port.lock, flags);
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lpuart_setup_watermark(sport);
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temp = readb(sport->port.membase + UARTCR2);
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temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE);
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writeb(temp, sport->port.membase + UARTCR2);
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spin_unlock_irqrestore(&sport->port.lock, flags);
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return 0;
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}
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static void lpuart_shutdown(struct uart_port *port)
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{
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struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
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unsigned char temp;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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/* disable Rx/Tx and interrupts */
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temp = readb(port->membase + UARTCR2);
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temp &= ~(UARTCR2_TE | UARTCR2_RE |
|
||||
UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
|
||||
writeb(temp, port->membase + UARTCR2);
|
||||
|
||||
spin_unlock_irqrestore(&port->lock, flags);
|
||||
|
||||
devm_free_irq(port->dev, port->irq, sport);
|
||||
}
|
||||
|
||||
static void
|
||||
lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
|
||||
struct ktermios *old)
|
||||
{
|
||||
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
|
||||
unsigned long flags;
|
||||
unsigned char cr1, old_cr1, old_cr2, cr4, bdh, modem;
|
||||
unsigned int baud;
|
||||
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
|
||||
unsigned int sbr, brfa;
|
||||
|
||||
cr1 = old_cr1 = readb(sport->port.membase + UARTCR1);
|
||||
old_cr2 = readb(sport->port.membase + UARTCR2);
|
||||
cr4 = readb(sport->port.membase + UARTCR4);
|
||||
bdh = readb(sport->port.membase + UARTBDH);
|
||||
modem = readb(sport->port.membase + UARTMODEM);
|
||||
/*
|
||||
* only support CS8 and CS7, and for CS7 must enable PE.
|
||||
* supported mode:
|
||||
* - (7,e/o,1)
|
||||
* - (8,n,1)
|
||||
* - (8,m/s,1)
|
||||
* - (8,e/o,1)
|
||||
*/
|
||||
while ((termios->c_cflag & CSIZE) != CS8 &&
|
||||
(termios->c_cflag & CSIZE) != CS7) {
|
||||
termios->c_cflag &= ~CSIZE;
|
||||
termios->c_cflag |= old_csize;
|
||||
old_csize = CS8;
|
||||
}
|
||||
|
||||
if ((termios->c_cflag & CSIZE) == CS8 ||
|
||||
(termios->c_cflag & CSIZE) == CS7)
|
||||
cr1 = old_cr1 & ~UARTCR1_M;
|
||||
|
||||
if (termios->c_cflag & CMSPAR) {
|
||||
if ((termios->c_cflag & CSIZE) != CS8) {
|
||||
termios->c_cflag &= ~CSIZE;
|
||||
termios->c_cflag |= CS8;
|
||||
}
|
||||
cr1 |= UARTCR1_M;
|
||||
}
|
||||
|
||||
if (termios->c_cflag & CRTSCTS) {
|
||||
modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
|
||||
} else {
|
||||
termios->c_cflag &= ~CRTSCTS;
|
||||
modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
|
||||
}
|
||||
|
||||
if (termios->c_cflag & CSTOPB)
|
||||
termios->c_cflag &= ~CSTOPB;
|
||||
|
||||
/* parity must be enabled when CS7 to match 8-bits format */
|
||||
if ((termios->c_cflag & CSIZE) == CS7)
|
||||
termios->c_cflag |= PARENB;
|
||||
|
||||
if ((termios->c_cflag & PARENB)) {
|
||||
if (termios->c_cflag & CMSPAR) {
|
||||
cr1 &= ~UARTCR1_PE;
|
||||
cr1 |= UARTCR1_M;
|
||||
} else {
|
||||
cr1 |= UARTCR1_PE;
|
||||
if ((termios->c_cflag & CSIZE) == CS8)
|
||||
cr1 |= UARTCR1_M;
|
||||
if (termios->c_cflag & PARODD)
|
||||
cr1 |= UARTCR1_PT;
|
||||
else
|
||||
cr1 &= ~UARTCR1_PT;
|
||||
}
|
||||
}
|
||||
|
||||
/* ask the core to calculate the divisor */
|
||||
baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
|
||||
|
||||
spin_lock_irqsave(&sport->port.lock, flags);
|
||||
|
||||
sport->port.read_status_mask = 0;
|
||||
if (termios->c_iflag & INPCK)
|
||||
sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE);
|
||||
if (termios->c_iflag & (BRKINT | PARMRK))
|
||||
sport->port.read_status_mask |= UARTSR1_FE;
|
||||
|
||||
/* characters to ignore */
|
||||
sport->port.ignore_status_mask = 0;
|
||||
if (termios->c_iflag & IGNPAR)
|
||||
sport->port.ignore_status_mask |= UARTSR1_PE;
|
||||
if (termios->c_iflag & IGNBRK) {
|
||||
sport->port.ignore_status_mask |= UARTSR1_FE;
|
||||
/*
|
||||
* if we're ignoring parity and break indicators,
|
||||
* ignore overruns too (for real raw support).
|
||||
*/
|
||||
if (termios->c_iflag & IGNPAR)
|
||||
sport->port.ignore_status_mask |= UARTSR1_OR;
|
||||
}
|
||||
|
||||
/* update the per-port timeout */
|
||||
uart_update_timeout(port, termios->c_cflag, baud);
|
||||
|
||||
/* wait transmit engin complete */
|
||||
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
|
||||
barrier();
|
||||
|
||||
/* disable transmit and receive */
|
||||
writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE),
|
||||
sport->port.membase + UARTCR2);
|
||||
|
||||
sbr = sport->port.uartclk / (16 * baud);
|
||||
brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2) / baud;
|
||||
bdh &= ~UARTBDH_SBR_MASK;
|
||||
bdh |= (sbr >> 8) & 0x1F;
|
||||
cr4 &= ~UARTCR4_BRFA_MASK;
|
||||
brfa &= UARTCR4_BRFA_MASK;
|
||||
writeb(cr4 | brfa, sport->port.membase + UARTCR4);
|
||||
writeb(bdh, sport->port.membase + UARTBDH);
|
||||
writeb(sbr & 0xFF, sport->port.membase + UARTBDL);
|
||||
writeb(cr1, sport->port.membase + UARTCR1);
|
||||
writeb(modem, sport->port.membase + UARTMODEM);
|
||||
|
||||
/* restore control register */
|
||||
writeb(old_cr2, sport->port.membase + UARTCR2);
|
||||
|
||||
spin_unlock_irqrestore(&sport->port.lock, flags);
|
||||
}
|
||||
|
||||
static const char *lpuart_type(struct uart_port *port)
|
||||
{
|
||||
return "FSL_LPUART";
|
||||
}
|
||||
|
||||
static void lpuart_release_port(struct uart_port *port)
|
||||
{
|
||||
/* nothing to do */
|
||||
}
|
||||
|
||||
static int lpuart_request_port(struct uart_port *port)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* configure/autoconfigure the port */
|
||||
static void lpuart_config_port(struct uart_port *port, int flags)
|
||||
{
|
||||
if (flags & UART_CONFIG_TYPE)
|
||||
port->type = PORT_LPUART;
|
||||
}
|
||||
|
||||
static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (ser->type != PORT_UNKNOWN && ser->type != PORT_LPUART)
|
||||
ret = -EINVAL;
|
||||
if (port->irq != ser->irq)
|
||||
ret = -EINVAL;
|
||||
if (ser->io_type != UPIO_MEM)
|
||||
ret = -EINVAL;
|
||||
if (port->uartclk / 16 != ser->baud_base)
|
||||
ret = -EINVAL;
|
||||
if (port->iobase != ser->port)
|
||||
ret = -EINVAL;
|
||||
if (ser->hub6 != 0)
|
||||
ret = -EINVAL;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct uart_ops lpuart_pops = {
|
||||
.tx_empty = lpuart_tx_empty,
|
||||
.set_mctrl = lpuart_set_mctrl,
|
||||
.get_mctrl = lpuart_get_mctrl,
|
||||
.stop_tx = lpuart_stop_tx,
|
||||
.start_tx = lpuart_start_tx,
|
||||
.stop_rx = lpuart_stop_rx,
|
||||
.enable_ms = lpuart_enable_ms,
|
||||
.break_ctl = lpuart_break_ctl,
|
||||
.startup = lpuart_startup,
|
||||
.shutdown = lpuart_shutdown,
|
||||
.set_termios = lpuart_set_termios,
|
||||
.type = lpuart_type,
|
||||
.request_port = lpuart_request_port,
|
||||
.release_port = lpuart_release_port,
|
||||
.config_port = lpuart_config_port,
|
||||
.verify_port = lpuart_verify_port,
|
||||
};
|
||||
|
||||
static struct lpuart_port *lpuart_ports[UART_NR];
|
||||
|
||||
#ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
|
||||
static void lpuart_console_putchar(struct uart_port *port, int ch)
|
||||
{
|
||||
while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE))
|
||||
barrier();
|
||||
|
||||
writeb(ch, port->membase + UARTDR);
|
||||
}
|
||||
|
||||
static void
|
||||
lpuart_console_write(struct console *co, const char *s, unsigned int count)
|
||||
{
|
||||
struct lpuart_port *sport = lpuart_ports[co->index];
|
||||
unsigned char old_cr2, cr2;
|
||||
|
||||
/* first save CR2 and then disable interrupts */
|
||||
cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
|
||||
cr2 |= (UARTCR2_TE | UARTCR2_RE);
|
||||
cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE);
|
||||
writeb(cr2, sport->port.membase + UARTCR2);
|
||||
|
||||
uart_console_write(&sport->port, s, count, lpuart_console_putchar);
|
||||
|
||||
/* wait for transmitter finish complete and restore CR2 */
|
||||
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
|
||||
barrier();
|
||||
|
||||
writeb(old_cr2, sport->port.membase + UARTCR2);
|
||||
}
|
||||
|
||||
/*
|
||||
* if the port was already initialised (eg, by a boot loader),
|
||||
* try to determine the current setup.
|
||||
*/
|
||||
static void __init
|
||||
lpuart_console_get_options(struct lpuart_port *sport, int *baud,
|
||||
int *parity, int *bits)
|
||||
{
|
||||
unsigned char cr, bdh, bdl, brfa;
|
||||
unsigned int sbr, uartclk, baud_raw;
|
||||
|
||||
cr = readb(sport->port.membase + UARTCR2);
|
||||
cr &= UARTCR2_TE | UARTCR2_RE;
|
||||
if (!cr)
|
||||
return;
|
||||
|
||||
/* ok, the port was enabled */
|
||||
|
||||
cr = readb(sport->port.membase + UARTCR1);
|
||||
|
||||
*parity = 'n';
|
||||
if (cr & UARTCR1_PE) {
|
||||
if (cr & UARTCR1_PT)
|
||||
*parity = 'o';
|
||||
else
|
||||
*parity = 'e';
|
||||
}
|
||||
|
||||
if (cr & UARTCR1_M)
|
||||
*bits = 9;
|
||||
else
|
||||
*bits = 8;
|
||||
|
||||
bdh = readb(sport->port.membase + UARTBDH);
|
||||
bdh &= UARTBDH_SBR_MASK;
|
||||
bdl = readb(sport->port.membase + UARTBDL);
|
||||
sbr = bdh;
|
||||
sbr <<= 8;
|
||||
sbr |= bdl;
|
||||
brfa = readb(sport->port.membase + UARTCR4);
|
||||
brfa &= UARTCR4_BRFA_MASK;
|
||||
|
||||
uartclk = clk_get_rate(sport->clk);
|
||||
/*
|
||||
* baud = mod_clk/(16*(sbr[13]+(brfa)/32)
|
||||
*/
|
||||
baud_raw = uartclk / (16 * (sbr + brfa / 32));
|
||||
|
||||
if (*baud != baud_raw)
|
||||
printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
|
||||
"from %d to %d\n", baud_raw, *baud);
|
||||
}
|
||||
|
||||
static int __init lpuart_console_setup(struct console *co, char *options)
|
||||
{
|
||||
struct lpuart_port *sport;
|
||||
int baud = 115200;
|
||||
int bits = 8;
|
||||
int parity = 'n';
|
||||
int flow = 'n';
|
||||
|
||||
/*
|
||||
* check whether an invalid uart number has been specified, and
|
||||
* if so, search for the first available port that does have
|
||||
* console support.
|
||||
*/
|
||||
if (co->index == -1 || co->index >= ARRAY_SIZE(lpuart_ports))
|
||||
co->index = 0;
|
||||
|
||||
sport = lpuart_ports[co->index];
|
||||
if (sport == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
if (options)
|
||||
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
||||
else
|
||||
lpuart_console_get_options(sport, &baud, &parity, &bits);
|
||||
|
||||
lpuart_setup_watermark(sport);
|
||||
|
||||
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
|
||||
}
|
||||
|
||||
static struct uart_driver lpuart_reg;
|
||||
static struct console lpuart_console = {
|
||||
.name = DEV_NAME,
|
||||
.write = lpuart_console_write,
|
||||
.device = uart_console_device,
|
||||
.setup = lpuart_console_setup,
|
||||
.flags = CON_PRINTBUFFER,
|
||||
.index = -1,
|
||||
.data = &lpuart_reg,
|
||||
};
|
||||
|
||||
#define LPUART_CONSOLE (&lpuart_console)
|
||||
#else
|
||||
#define LPUART_CONSOLE NULL
|
||||
#endif
|
||||
|
||||
static struct uart_driver lpuart_reg = {
|
||||
.owner = THIS_MODULE,
|
||||
.driver_name = DRIVER_NAME,
|
||||
.dev_name = DEV_NAME,
|
||||
.nr = ARRAY_SIZE(lpuart_ports),
|
||||
.cons = LPUART_CONSOLE,
|
||||
};
|
||||
|
||||
static int lpuart_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device_node *np = pdev->dev.of_node;
|
||||
struct lpuart_port *sport;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL);
|
||||
if (!sport)
|
||||
return -ENOMEM;
|
||||
|
||||
pdev->dev.coherent_dma_mask = 0;
|
||||
|
||||
ret = of_alias_get_id(np, "serial");
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
sport->port.line = ret;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!res)
|
||||
return -ENODEV;
|
||||
|
||||
sport->port.mapbase = res->start;
|
||||
sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(sport->port.membase))
|
||||
return PTR_ERR(sport->port.membase);
|
||||
|
||||
sport->port.dev = &pdev->dev;
|
||||
sport->port.type = PORT_LPUART;
|
||||
sport->port.iotype = UPIO_MEM;
|
||||
sport->port.irq = platform_get_irq(pdev, 0);
|
||||
sport->port.ops = &lpuart_pops;
|
||||
sport->port.flags = UPF_BOOT_AUTOCONF;
|
||||
|
||||
sport->clk = devm_clk_get(&pdev->dev, "ipg");
|
||||
if (IS_ERR(sport->clk)) {
|
||||
ret = PTR_ERR(sport->clk);
|
||||
dev_err(&pdev->dev, "failed to get uart clk: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = clk_prepare_enable(sport->clk);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
sport->port.uartclk = clk_get_rate(sport->clk);
|
||||
|
||||
lpuart_ports[sport->port.line] = sport;
|
||||
|
||||
platform_set_drvdata(pdev, &sport->port);
|
||||
|
||||
ret = uart_add_one_port(&lpuart_reg, &sport->port);
|
||||
if (ret) {
|
||||
clk_disable_unprepare(sport->clk);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lpuart_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct lpuart_port *sport = platform_get_drvdata(pdev);
|
||||
|
||||
uart_remove_one_port(&lpuart_reg, &sport->port);
|
||||
|
||||
clk_disable_unprepare(sport->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int lpuart_suspend(struct device *dev)
|
||||
{
|
||||
struct lpuart_port *sport = dev_get_drvdata(dev);
|
||||
|
||||
uart_suspend_port(&lpuart_reg, &sport->port);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lpuart_resume(struct device *dev)
|
||||
{
|
||||
struct lpuart_port *sport = dev_get_drvdata(dev);
|
||||
|
||||
uart_resume_port(&lpuart_reg, &sport->port);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume);
|
||||
|
||||
static struct platform_driver lpuart_driver = {
|
||||
.probe = lpuart_probe,
|
||||
.remove = lpuart_remove,
|
||||
.driver = {
|
||||
.name = "fsl-lpuart",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = lpuart_dt_ids,
|
||||
.pm = &lpuart_pm_ops,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init lpuart_serial_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
pr_info("serial: Freescale lpuart driver\n");
|
||||
|
||||
ret = uart_register_driver(&lpuart_reg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = platform_driver_register(&lpuart_driver);
|
||||
if (ret)
|
||||
uart_unregister_driver(&lpuart_reg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit lpuart_serial_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&lpuart_driver);
|
||||
uart_unregister_driver(&lpuart_reg);
|
||||
}
|
||||
|
||||
module_init(lpuart_serial_init);
|
||||
module_exit(lpuart_serial_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Freescale lpuart serial port driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
@ -226,4 +226,7 @@
|
||||
/* Rocketport EXPRESS/INFINITY */
|
||||
#define PORT_RP2 102
|
||||
|
||||
/* Freescale lpuart */
|
||||
#define PORT_LPUART 103
|
||||
|
||||
#endif /* _UAPILINUX_SERIAL_CORE_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user