![Linus Torvalds](/assets/img/avatar_default.png)
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (117 commits) [ARM] 4058/2: iop32x: set ->broken_parity_status on n2100 onboard r8169 ports [ARM] 4140/1: AACI stability add ac97 timeout and retries [ARM] 4139/1: AACI record support [ARM] 4138/1: AACI: multiple channel support for IRQ handling [ARM] 4211/1: Provide a defconfig for ns9xxx [ARM] 4210/1: base for new machine type "NetSilicon NS9360" [ARM] 4222/1: S3C2443: Remove reference to missing S3C2443_PM [ARM] 4221/1: S3C2443: DMA support [ARM] 4220/1: S3C24XX: DMA system initialised from sysdev [ARM] 4219/1: S3C2443: DMA source definitions [ARM] 4218/1: S3C2412: fix CONFIG_CPU_S3C2412_ONLY wrt to S3C2443 [ARM] 4217/1: S3C24XX: remove the dma channel show at startup [ARM] 4090/2: avoid clash between PXA and SA1111 defines [ARM] 4216/1: add .gitignore entries for ARM specific files [ARM] 4214/2: S3C2410: Add Armzone QT2410 [ARM] 4215/1: s3c2410 usb device: per-platform vbus_draw [ARM] 4213/1: S3C2410 - Update definition of ADCTSC_XY_PST [ARM] 4098/1: ARM: rtc_lock only used with rtc_cmos [ARM] 4137/1: Add kexec support [ARM] 4201/1: SMP barriers pair needed for the secondary boot process ... Fix up conflict due to typedef removal in sound/arm/aaci.h
995 lines
25 KiB
C
995 lines
25 KiB
C
/*
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* linux/drivers/char/atmel_serial.c
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*
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* Driver for Atmel AT91 / AT32 Serial ports
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* Copyright (C) 2003 Rick Bronson
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*
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* Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
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* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/serial.h>
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#include <linux/clk.h>
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#include <linux/console.h>
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#include <linux/sysrq.h>
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#include <linux/tty_flip.h>
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#include <linux/platform_device.h>
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#include <linux/atmel_pdc.h>
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#include <asm/io.h>
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#include <asm/mach/serial_at91.h>
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#include <asm/arch/board.h>
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#ifdef CONFIG_ARM
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#include <asm/arch/cpu.h>
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#include <asm/arch/gpio.h>
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#endif
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#include "atmel_serial.h"
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#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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#endif
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#include <linux/serial_core.h>
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#ifdef CONFIG_SERIAL_ATMEL_TTYAT
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/* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
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* should coexist with the 8250 driver, such as if we have an external 16C550
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* UART. */
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#define SERIAL_ATMEL_MAJOR 204
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#define MINOR_START 154
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#define ATMEL_DEVICENAME "ttyAT"
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#else
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/* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
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* name, but it is legally reserved for the 8250 driver. */
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#define SERIAL_ATMEL_MAJOR TTY_MAJOR
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#define MINOR_START 64
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#define ATMEL_DEVICENAME "ttyS"
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#endif
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#define ATMEL_ISR_PASS_LIMIT 256
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#define UART_PUT_CR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_CR)
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#define UART_GET_MR(port) __raw_readl((port)->membase + ATMEL_US_MR)
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#define UART_PUT_MR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_MR)
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#define UART_PUT_IER(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IER)
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#define UART_PUT_IDR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IDR)
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#define UART_GET_IMR(port) __raw_readl((port)->membase + ATMEL_US_IMR)
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#define UART_GET_CSR(port) __raw_readl((port)->membase + ATMEL_US_CSR)
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#define UART_GET_CHAR(port) __raw_readl((port)->membase + ATMEL_US_RHR)
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#define UART_PUT_CHAR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_THR)
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#define UART_GET_BRGR(port) __raw_readl((port)->membase + ATMEL_US_BRGR)
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#define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
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#define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
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// #define UART_GET_CR(port) __raw_readl((port)->membase + ATMEL_US_CR) // is write-only
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/* PDC registers */
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#define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
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#define UART_GET_PTSR(port) __raw_readl((port)->membase + ATMEL_PDC_PTSR)
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#define UART_PUT_RPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
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#define UART_GET_RPR(port) __raw_readl((port)->membase + ATMEL_PDC_RPR)
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#define UART_PUT_RCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RCR)
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#define UART_PUT_RNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNPR)
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#define UART_PUT_RNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNCR)
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#define UART_PUT_TPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
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#define UART_PUT_TCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
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//#define UART_PUT_TNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TNPR)
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//#define UART_PUT_TNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TNCR)
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static int (*atmel_open_hook)(struct uart_port *);
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static void (*atmel_close_hook)(struct uart_port *);
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/*
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* We wrap our port structure around the generic uart_port.
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*/
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struct atmel_uart_port {
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struct uart_port uart; /* uart */
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struct clk *clk; /* uart clock */
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unsigned short suspended; /* is port suspended? */
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};
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static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
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#ifdef SUPPORT_SYSRQ
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static struct console atmel_console;
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#endif
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/*
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* Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
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*/
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static u_int atmel_tx_empty(struct uart_port *port)
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{
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return (UART_GET_CSR(port) & ATMEL_US_TXEMPTY) ? TIOCSER_TEMT : 0;
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}
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/*
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* Set state of the modem control output lines
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*/
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static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
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{
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unsigned int control = 0;
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unsigned int mode;
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#ifdef CONFIG_ARCH_AT91RM9200
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if (cpu_is_at91rm9200()) {
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/*
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* AT91RM9200 Errata #39: RTS0 is not internally connected to PA21.
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* We need to drive the pin manually.
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*/
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if (port->mapbase == AT91RM9200_BASE_US0) {
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if (mctrl & TIOCM_RTS)
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at91_set_gpio_value(AT91_PIN_PA21, 0);
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else
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at91_set_gpio_value(AT91_PIN_PA21, 1);
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}
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}
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#endif
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if (mctrl & TIOCM_RTS)
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control |= ATMEL_US_RTSEN;
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else
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control |= ATMEL_US_RTSDIS;
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if (mctrl & TIOCM_DTR)
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control |= ATMEL_US_DTREN;
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else
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control |= ATMEL_US_DTRDIS;
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UART_PUT_CR(port, control);
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/* Local loopback mode? */
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mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
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if (mctrl & TIOCM_LOOP)
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mode |= ATMEL_US_CHMODE_LOC_LOOP;
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else
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mode |= ATMEL_US_CHMODE_NORMAL;
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UART_PUT_MR(port, mode);
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}
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/*
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* Get state of the modem control input lines
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*/
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static u_int atmel_get_mctrl(struct uart_port *port)
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{
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unsigned int status, ret = 0;
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status = UART_GET_CSR(port);
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/*
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* The control signals are active low.
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*/
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if (!(status & ATMEL_US_DCD))
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ret |= TIOCM_CD;
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if (!(status & ATMEL_US_CTS))
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ret |= TIOCM_CTS;
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if (!(status & ATMEL_US_DSR))
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ret |= TIOCM_DSR;
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if (!(status & ATMEL_US_RI))
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ret |= TIOCM_RI;
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return ret;
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}
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/*
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* Stop transmitting.
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*/
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static void atmel_stop_tx(struct uart_port *port)
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{
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
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UART_PUT_IDR(port, ATMEL_US_TXRDY);
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}
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/*
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* Start transmitting.
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*/
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static void atmel_start_tx(struct uart_port *port)
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{
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
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UART_PUT_IER(port, ATMEL_US_TXRDY);
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}
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/*
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* Stop receiving - port is in process of being closed.
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*/
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static void atmel_stop_rx(struct uart_port *port)
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{
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
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UART_PUT_IDR(port, ATMEL_US_RXRDY);
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}
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/*
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* Enable modem status interrupts
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*/
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static void atmel_enable_ms(struct uart_port *port)
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{
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UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC);
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}
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/*
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* Control the transmission of a break signal
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*/
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static void atmel_break_ctl(struct uart_port *port, int break_state)
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{
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if (break_state != 0)
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UART_PUT_CR(port, ATMEL_US_STTBRK); /* start break */
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else
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UART_PUT_CR(port, ATMEL_US_STPBRK); /* stop break */
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}
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/*
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* Characters received (called from interrupt handler)
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*/
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static void atmel_rx_chars(struct uart_port *port)
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{
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struct tty_struct *tty = port->info->tty;
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unsigned int status, ch, flg;
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status = UART_GET_CSR(port);
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while (status & ATMEL_US_RXRDY) {
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ch = UART_GET_CHAR(port);
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port->icount.rx++;
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flg = TTY_NORMAL;
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/*
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* note that the error handling code is
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* out of the main execution path
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*/
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if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME | ATMEL_US_OVRE | ATMEL_US_RXBRK))) {
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UART_PUT_CR(port, ATMEL_US_RSTSTA); /* clear error */
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if (status & ATMEL_US_RXBRK) {
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status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME); /* ignore side-effect */
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port->icount.brk++;
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if (uart_handle_break(port))
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goto ignore_char;
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}
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if (status & ATMEL_US_PARE)
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port->icount.parity++;
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if (status & ATMEL_US_FRAME)
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port->icount.frame++;
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if (status & ATMEL_US_OVRE)
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port->icount.overrun++;
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status &= port->read_status_mask;
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if (status & ATMEL_US_RXBRK)
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flg = TTY_BREAK;
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else if (status & ATMEL_US_PARE)
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flg = TTY_PARITY;
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else if (status & ATMEL_US_FRAME)
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flg = TTY_FRAME;
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}
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if (uart_handle_sysrq_char(port, ch))
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goto ignore_char;
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uart_insert_char(port, status, ATMEL_US_OVRE, ch, flg);
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ignore_char:
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status = UART_GET_CSR(port);
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}
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tty_flip_buffer_push(tty);
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}
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/*
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* Transmit characters (called from interrupt handler)
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*/
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static void atmel_tx_chars(struct uart_port *port)
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{
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struct circ_buf *xmit = &port->info->xmit;
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if (port->x_char) {
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UART_PUT_CHAR(port, port->x_char);
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port->icount.tx++;
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port->x_char = 0;
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return;
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}
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if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
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atmel_stop_tx(port);
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return;
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}
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while (UART_GET_CSR(port) & ATMEL_US_TXRDY) {
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UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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port->icount.tx++;
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if (uart_circ_empty(xmit))
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break;
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}
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(port);
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if (uart_circ_empty(xmit))
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atmel_stop_tx(port);
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}
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/*
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* Interrupt handler
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*/
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static irqreturn_t atmel_interrupt(int irq, void *dev_id)
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{
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struct uart_port *port = dev_id;
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
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unsigned int status, pending, pass_counter = 0;
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status = UART_GET_CSR(port);
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pending = status & UART_GET_IMR(port);
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while (pending) {
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/* Interrupt receive */
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if (pending & ATMEL_US_RXRDY)
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atmel_rx_chars(port);
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// TODO: All reads to CSR will clear these interrupts!
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if (pending & ATMEL_US_RIIC) port->icount.rng++;
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if (pending & ATMEL_US_DSRIC) port->icount.dsr++;
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if (pending & ATMEL_US_DCDIC)
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uart_handle_dcd_change(port, !(status & ATMEL_US_DCD));
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if (pending & ATMEL_US_CTSIC)
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uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
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if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC))
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wake_up_interruptible(&port->info->delta_msr_wait);
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/* Interrupt transmit */
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if (pending & ATMEL_US_TXRDY)
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atmel_tx_chars(port);
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if (pass_counter++ > ATMEL_ISR_PASS_LIMIT)
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break;
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status = UART_GET_CSR(port);
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pending = status & UART_GET_IMR(port);
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}
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return IRQ_HANDLED;
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}
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/*
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* Perform initialization and enable port for reception
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*/
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static int atmel_startup(struct uart_port *port)
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{
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
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int retval;
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/*
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* Ensure that no interrupts are enabled otherwise when
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* request_irq() is called we could get stuck trying to
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* handle an unexpected interrupt
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*/
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UART_PUT_IDR(port, -1);
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/*
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* Allocate the IRQ
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*/
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retval = request_irq(port->irq, atmel_interrupt, IRQF_SHARED, "atmel_serial", port);
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if (retval) {
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printk("atmel_serial: atmel_startup - Can't get irq\n");
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return retval;
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}
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/*
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* If there is a specific "open" function (to register
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* control line interrupts)
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*/
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if (atmel_open_hook) {
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retval = atmel_open_hook(port);
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if (retval) {
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free_irq(port->irq, port);
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return retval;
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}
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}
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/*
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* Finally, enable the serial port
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*/
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UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
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UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN); /* enable xmit & rcvr */
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UART_PUT_IER(port, ATMEL_US_RXRDY); /* enable receive only */
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return 0;
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}
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/*
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* Disable the port
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*/
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static void atmel_shutdown(struct uart_port *port)
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{
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
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/*
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* Disable all interrupts, port and break condition.
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*/
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UART_PUT_CR(port, ATMEL_US_RSTSTA);
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UART_PUT_IDR(port, -1);
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/*
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* Free the interrupt
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*/
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free_irq(port->irq, port);
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/*
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* If there is a specific "close" function (to unregister
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* control line interrupts)
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*/
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if (atmel_close_hook)
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atmel_close_hook(port);
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}
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/*
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* Power / Clock management.
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*/
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static void atmel_serial_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
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{
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struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
|
|
|
|
switch (state) {
|
|
case 0:
|
|
/*
|
|
* Enable the peripheral clock for this serial port.
|
|
* This is called on uart_open() or a resume event.
|
|
*/
|
|
clk_enable(atmel_port->clk);
|
|
break;
|
|
case 3:
|
|
/*
|
|
* Disable the peripheral clock for this serial port.
|
|
* This is called on uart_close() or a suspend event.
|
|
*/
|
|
clk_disable(atmel_port->clk);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "atmel_serial: unknown pm %d\n", state);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Change the port parameters
|
|
*/
|
|
static void atmel_set_termios(struct uart_port *port, struct ktermios * termios, struct ktermios * old)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int mode, imr, quot, baud;
|
|
|
|
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
|
|
quot = uart_get_divisor(port, baud);
|
|
|
|
/* Get current mode register */
|
|
mode = UART_GET_MR(port) & ~(ATMEL_US_CHRL | ATMEL_US_NBSTOP | ATMEL_US_PAR);
|
|
|
|
/* byte size */
|
|
switch (termios->c_cflag & CSIZE) {
|
|
case CS5:
|
|
mode |= ATMEL_US_CHRL_5;
|
|
break;
|
|
case CS6:
|
|
mode |= ATMEL_US_CHRL_6;
|
|
break;
|
|
case CS7:
|
|
mode |= ATMEL_US_CHRL_7;
|
|
break;
|
|
default:
|
|
mode |= ATMEL_US_CHRL_8;
|
|
break;
|
|
}
|
|
|
|
/* stop bits */
|
|
if (termios->c_cflag & CSTOPB)
|
|
mode |= ATMEL_US_NBSTOP_2;
|
|
|
|
/* parity */
|
|
if (termios->c_cflag & PARENB) {
|
|
if (termios->c_cflag & CMSPAR) { /* Mark or Space parity */
|
|
if (termios->c_cflag & PARODD)
|
|
mode |= ATMEL_US_PAR_MARK;
|
|
else
|
|
mode |= ATMEL_US_PAR_SPACE;
|
|
}
|
|
else if (termios->c_cflag & PARODD)
|
|
mode |= ATMEL_US_PAR_ODD;
|
|
else
|
|
mode |= ATMEL_US_PAR_EVEN;
|
|
}
|
|
else
|
|
mode |= ATMEL_US_PAR_NONE;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
port->read_status_mask = ATMEL_US_OVRE;
|
|
if (termios->c_iflag & INPCK)
|
|
port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
|
|
if (termios->c_iflag & (BRKINT | PARMRK))
|
|
port->read_status_mask |= ATMEL_US_RXBRK;
|
|
|
|
/*
|
|
* Characters to ignore
|
|
*/
|
|
port->ignore_status_mask = 0;
|
|
if (termios->c_iflag & IGNPAR)
|
|
port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
|
|
if (termios->c_iflag & IGNBRK) {
|
|
port->ignore_status_mask |= ATMEL_US_RXBRK;
|
|
/*
|
|
* If we're ignoring parity and break indicators,
|
|
* ignore overruns too (for real raw support).
|
|
*/
|
|
if (termios->c_iflag & IGNPAR)
|
|
port->ignore_status_mask |= ATMEL_US_OVRE;
|
|
}
|
|
|
|
// TODO: Ignore all characters if CREAD is set.
|
|
|
|
/* update the per-port timeout */
|
|
uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
|
/* disable interrupts and drain transmitter */
|
|
imr = UART_GET_IMR(port); /* get interrupt mask */
|
|
UART_PUT_IDR(port, -1); /* disable all interrupts */
|
|
while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY)) { barrier(); }
|
|
|
|
/* disable receiver and transmitter */
|
|
UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
|
|
|
|
/* set the parity, stop bits and data size */
|
|
UART_PUT_MR(port, mode);
|
|
|
|
/* set the baud rate */
|
|
UART_PUT_BRGR(port, quot);
|
|
UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
|
|
UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
|
|
|
|
/* restore interrupts */
|
|
UART_PUT_IER(port, imr);
|
|
|
|
/* CTS flow-control and modem-status interrupts */
|
|
if (UART_ENABLE_MS(port, termios->c_cflag))
|
|
port->ops->enable_ms(port);
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Return string describing the specified port
|
|
*/
|
|
static const char *atmel_type(struct uart_port *port)
|
|
{
|
|
return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL;
|
|
}
|
|
|
|
/*
|
|
* Release the memory region(s) being used by 'port'.
|
|
*/
|
|
static void atmel_release_port(struct uart_port *port)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(port->dev);
|
|
int size = pdev->resource[0].end - pdev->resource[0].start + 1;
|
|
|
|
release_mem_region(port->mapbase, size);
|
|
|
|
if (port->flags & UPF_IOREMAP) {
|
|
iounmap(port->membase);
|
|
port->membase = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Request the memory region(s) being used by 'port'.
|
|
*/
|
|
static int atmel_request_port(struct uart_port *port)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(port->dev);
|
|
int size = pdev->resource[0].end - pdev->resource[0].start + 1;
|
|
|
|
if (!request_mem_region(port->mapbase, size, "atmel_serial"))
|
|
return -EBUSY;
|
|
|
|
if (port->flags & UPF_IOREMAP) {
|
|
port->membase = ioremap(port->mapbase, size);
|
|
if (port->membase == NULL) {
|
|
release_mem_region(port->mapbase, size);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Configure/autoconfigure the port.
|
|
*/
|
|
static void atmel_config_port(struct uart_port *port, int flags)
|
|
{
|
|
if (flags & UART_CONFIG_TYPE) {
|
|
port->type = PORT_ATMEL;
|
|
atmel_request_port(port);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Verify the new serial_struct (for TIOCSSERIAL).
|
|
*/
|
|
static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
{
|
|
int ret = 0;
|
|
if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL)
|
|
ret = -EINVAL;
|
|
if (port->irq != ser->irq)
|
|
ret = -EINVAL;
|
|
if (ser->io_type != SERIAL_IO_MEM)
|
|
ret = -EINVAL;
|
|
if (port->uartclk / 16 != ser->baud_base)
|
|
ret = -EINVAL;
|
|
if ((void *)port->mapbase != ser->iomem_base)
|
|
ret = -EINVAL;
|
|
if (port->iobase != ser->port)
|
|
ret = -EINVAL;
|
|
if (ser->hub6 != 0)
|
|
ret = -EINVAL;
|
|
return ret;
|
|
}
|
|
|
|
static struct uart_ops atmel_pops = {
|
|
.tx_empty = atmel_tx_empty,
|
|
.set_mctrl = atmel_set_mctrl,
|
|
.get_mctrl = atmel_get_mctrl,
|
|
.stop_tx = atmel_stop_tx,
|
|
.start_tx = atmel_start_tx,
|
|
.stop_rx = atmel_stop_rx,
|
|
.enable_ms = atmel_enable_ms,
|
|
.break_ctl = atmel_break_ctl,
|
|
.startup = atmel_startup,
|
|
.shutdown = atmel_shutdown,
|
|
.set_termios = atmel_set_termios,
|
|
.type = atmel_type,
|
|
.release_port = atmel_release_port,
|
|
.request_port = atmel_request_port,
|
|
.config_port = atmel_config_port,
|
|
.verify_port = atmel_verify_port,
|
|
.pm = atmel_serial_pm,
|
|
};
|
|
|
|
/*
|
|
* Configure the port from the platform device resource info.
|
|
*/
|
|
static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port, struct platform_device *pdev)
|
|
{
|
|
struct uart_port *port = &atmel_port->uart;
|
|
struct atmel_uart_data *data = pdev->dev.platform_data;
|
|
|
|
port->iotype = UPIO_MEM;
|
|
port->flags = UPF_BOOT_AUTOCONF;
|
|
port->ops = &atmel_pops;
|
|
port->fifosize = 1;
|
|
port->line = pdev->id;
|
|
port->dev = &pdev->dev;
|
|
|
|
port->mapbase = pdev->resource[0].start;
|
|
port->irq = pdev->resource[1].start;
|
|
|
|
if (data->regs)
|
|
/* Already mapped by setup code */
|
|
port->membase = data->regs;
|
|
else {
|
|
port->flags |= UPF_IOREMAP;
|
|
port->membase = NULL;
|
|
}
|
|
|
|
if (!atmel_port->clk) { /* for console, the clock could already be configured */
|
|
atmel_port->clk = clk_get(&pdev->dev, "usart");
|
|
clk_enable(atmel_port->clk);
|
|
port->uartclk = clk_get_rate(atmel_port->clk);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Register board-specific modem-control line handlers.
|
|
*/
|
|
void __init atmel_register_uart_fns(struct atmel_port_fns *fns)
|
|
{
|
|
if (fns->enable_ms)
|
|
atmel_pops.enable_ms = fns->enable_ms;
|
|
if (fns->get_mctrl)
|
|
atmel_pops.get_mctrl = fns->get_mctrl;
|
|
if (fns->set_mctrl)
|
|
atmel_pops.set_mctrl = fns->set_mctrl;
|
|
atmel_open_hook = fns->open;
|
|
atmel_close_hook = fns->close;
|
|
atmel_pops.pm = fns->pm;
|
|
atmel_pops.set_wake = fns->set_wake;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
|
|
static void atmel_console_putchar(struct uart_port *port, int ch)
|
|
{
|
|
while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
|
|
barrier();
|
|
UART_PUT_CHAR(port, ch);
|
|
}
|
|
|
|
/*
|
|
* Interrupts are disabled on entering
|
|
*/
|
|
static void atmel_console_write(struct console *co, const char *s, u_int count)
|
|
{
|
|
struct uart_port *port = &atmel_ports[co->index].uart;
|
|
unsigned int status, imr;
|
|
|
|
/*
|
|
* First, save IMR and then disable interrupts
|
|
*/
|
|
imr = UART_GET_IMR(port); /* get interrupt mask */
|
|
UART_PUT_IDR(port, ATMEL_US_RXRDY | ATMEL_US_TXRDY);
|
|
|
|
uart_console_write(port, s, count, atmel_console_putchar);
|
|
|
|
/*
|
|
* Finally, wait for transmitter to become empty
|
|
* and restore IMR
|
|
*/
|
|
do {
|
|
status = UART_GET_CSR(port);
|
|
} while (!(status & ATMEL_US_TXRDY));
|
|
UART_PUT_IER(port, imr); /* set interrupts back the way they were */
|
|
}
|
|
|
|
/*
|
|
* If the port was already initialised (eg, by a boot loader), try to determine
|
|
* the current setup.
|
|
*/
|
|
static void __init atmel_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
|
|
{
|
|
unsigned int mr, quot;
|
|
|
|
// TODO: CR is a write-only register
|
|
// unsigned int cr;
|
|
//
|
|
// cr = UART_GET_CR(port) & (ATMEL_US_RXEN | ATMEL_US_TXEN);
|
|
// if (cr == (ATMEL_US_RXEN | ATMEL_US_TXEN)) {
|
|
// /* ok, the port was enabled */
|
|
// }
|
|
|
|
mr = UART_GET_MR(port) & ATMEL_US_CHRL;
|
|
if (mr == ATMEL_US_CHRL_8)
|
|
*bits = 8;
|
|
else
|
|
*bits = 7;
|
|
|
|
mr = UART_GET_MR(port) & ATMEL_US_PAR;
|
|
if (mr == ATMEL_US_PAR_EVEN)
|
|
*parity = 'e';
|
|
else if (mr == ATMEL_US_PAR_ODD)
|
|
*parity = 'o';
|
|
|
|
/*
|
|
* The serial core only rounds down when matching this to a
|
|
* supported baud rate. Make sure we don't end up slightly
|
|
* lower than one of those, as it would make us fall through
|
|
* to a much lower baud rate than we really want.
|
|
*/
|
|
quot = UART_GET_BRGR(port);
|
|
*baud = port->uartclk / (16 * (quot - 1));
|
|
}
|
|
|
|
static int __init atmel_console_setup(struct console *co, char *options)
|
|
{
|
|
struct uart_port *port = &atmel_ports[co->index].uart;
|
|
int baud = 115200;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
if (port->membase == 0) /* Port not initialized yet - delay setup */
|
|
return -ENODEV;
|
|
|
|
UART_PUT_IDR(port, -1); /* disable interrupts */
|
|
UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
|
|
UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
else
|
|
atmel_console_get_options(port, &baud, &parity, &bits);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct uart_driver atmel_uart;
|
|
|
|
static struct console atmel_console = {
|
|
.name = ATMEL_DEVICENAME,
|
|
.write = atmel_console_write,
|
|
.device = uart_console_device,
|
|
.setup = atmel_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &atmel_uart,
|
|
};
|
|
|
|
#define ATMEL_CONSOLE_DEVICE &atmel_console
|
|
|
|
/*
|
|
* Early console initialization (before VM subsystem initialized).
|
|
*/
|
|
static int __init atmel_console_init(void)
|
|
{
|
|
if (atmel_default_console_device) {
|
|
add_preferred_console(ATMEL_DEVICENAME, atmel_default_console_device->id, NULL);
|
|
atmel_init_port(&(atmel_ports[atmel_default_console_device->id]), atmel_default_console_device);
|
|
register_console(&atmel_console);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
console_initcall(atmel_console_init);
|
|
|
|
/*
|
|
* Late console initialization.
|
|
*/
|
|
static int __init atmel_late_console_init(void)
|
|
{
|
|
if (atmel_default_console_device && !(atmel_console.flags & CON_ENABLED))
|
|
register_console(&atmel_console);
|
|
|
|
return 0;
|
|
}
|
|
core_initcall(atmel_late_console_init);
|
|
|
|
#else
|
|
#define ATMEL_CONSOLE_DEVICE NULL
|
|
#endif
|
|
|
|
static struct uart_driver atmel_uart = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = "atmel_serial",
|
|
.dev_name = ATMEL_DEVICENAME,
|
|
.major = SERIAL_ATMEL_MAJOR,
|
|
.minor = MINOR_START,
|
|
.nr = ATMEL_MAX_UART,
|
|
.cons = ATMEL_CONSOLE_DEVICE,
|
|
};
|
|
|
|
#ifdef CONFIG_PM
|
|
static int atmel_serial_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct uart_port *port = platform_get_drvdata(pdev);
|
|
struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
|
|
|
|
if (device_may_wakeup(&pdev->dev) && !at91_suspend_entering_slow_clock())
|
|
enable_irq_wake(port->irq);
|
|
else {
|
|
uart_suspend_port(&atmel_uart, port);
|
|
atmel_port->suspended = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atmel_serial_resume(struct platform_device *pdev)
|
|
{
|
|
struct uart_port *port = platform_get_drvdata(pdev);
|
|
struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
|
|
|
|
if (atmel_port->suspended) {
|
|
uart_resume_port(&atmel_uart, port);
|
|
atmel_port->suspended = 0;
|
|
}
|
|
else
|
|
disable_irq_wake(port->irq);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define atmel_serial_suspend NULL
|
|
#define atmel_serial_resume NULL
|
|
#endif
|
|
|
|
static int __devinit atmel_serial_probe(struct platform_device *pdev)
|
|
{
|
|
struct atmel_uart_port *port;
|
|
int ret;
|
|
|
|
port = &atmel_ports[pdev->id];
|
|
atmel_init_port(port, pdev);
|
|
|
|
ret = uart_add_one_port(&atmel_uart, &port->uart);
|
|
if (!ret) {
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
platform_set_drvdata(pdev, port);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit atmel_serial_remove(struct platform_device *pdev)
|
|
{
|
|
struct uart_port *port = platform_get_drvdata(pdev);
|
|
struct atmel_uart_port *atmel_port = (struct atmel_uart_port *) port;
|
|
int ret = 0;
|
|
|
|
clk_disable(atmel_port->clk);
|
|
clk_put(atmel_port->clk);
|
|
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
if (port) {
|
|
ret = uart_remove_one_port(&atmel_uart, port);
|
|
kfree(port);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver atmel_serial_driver = {
|
|
.probe = atmel_serial_probe,
|
|
.remove = __devexit_p(atmel_serial_remove),
|
|
.suspend = atmel_serial_suspend,
|
|
.resume = atmel_serial_resume,
|
|
.driver = {
|
|
.name = "atmel_usart",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init atmel_serial_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = uart_register_driver(&atmel_uart);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = platform_driver_register(&atmel_serial_driver);
|
|
if (ret)
|
|
uart_unregister_driver(&atmel_uart);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit atmel_serial_exit(void)
|
|
{
|
|
platform_driver_unregister(&atmel_serial_driver);
|
|
uart_unregister_driver(&atmel_uart);
|
|
}
|
|
|
|
module_init(atmel_serial_init);
|
|
module_exit(atmel_serial_exit);
|
|
|
|
MODULE_AUTHOR("Rick Bronson");
|
|
MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
|
|
MODULE_LICENSE("GPL");
|