[ARM] 3592/1: AT91RM9200 Serial driver update
Patch from Andrew Victor This patch includes a number of updates to the AT91RM9200 serial driver. Changes include: 1. Conversion to a platform_driver. [Ivan Kokshaysky] 2. Replaced all references to AT91RM9200 with AT91. This driver can now also be used for the AT91SAM9216. 3. Allow TIOCM_LOOP to configure local loopback mode. 4. Cleaned up the 'read_status_mask' usage and interrupt handler code. [Chip Coldwell] 5. Suspend/resume support. [David Brownell] There are a few 'unused variable' warning when compiling this - I removed the new DMA support to keep this first patch simpler. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor
committed by
Russell King
Russell King
parent
82dc0772a8
commit
afefc4158f
@ -2,7 +2,6 @@
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* linux/drivers/char/at91_serial.c
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*
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* Driver for Atmel AT91RM9200 Serial ports
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*
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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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@ -30,17 +29,19 @@
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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 <asm/io.h>
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#include <asm/arch/at91rm9200_usart.h>
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#include <asm/mach/serial_at91rm9200.h>
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#include <asm/arch/at91rm9200_pdc.h>
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#include <asm/mach/serial_at91.h>
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#include <asm/arch/board.h>
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#include <asm/arch/pio.h>
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#include <asm/arch/system.h>
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#if defined(CONFIG_SERIAL_AT91_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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@ -67,7 +68,6 @@
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#endif
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#define AT91_VA_BASE_DBGU ((unsigned long) AT91_VA_BASE_SYS + AT91_DBGU)
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#define AT91_ISR_PASS_LIMIT 256
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#define UART_PUT_CR(port,v) writel(v, (port)->membase + AT91_US_CR)
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@ -87,16 +87,33 @@
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/* PDC registers */
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#define UART_PUT_PTCR(port,v) writel(v, (port)->membase + AT91_PDC_PTCR)
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#define UART_GET_PTSR(port) readl((port)->membase + AT91_PDC_PTSR)
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#define UART_PUT_RPR(port,v) writel(v, (port)->membase + AT91_PDC_RPR)
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#define UART_GET_RPR(port) readl((port)->membase + AT91_PDC_RPR)
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#define UART_PUT_RCR(port,v) writel(v, (port)->membase + AT91_PDC_RCR)
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#define UART_GET_RCR(port) readl((port)->membase + AT91_PDC_RCR)
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#define UART_PUT_RNPR(port,v) writel(v, (port)->membase + AT91_PDC_RNPR)
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#define UART_PUT_RNCR(port,v) writel(v, (port)->membase + AT91_PDC_RNCR)
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#define UART_PUT_TPR(port,v) writel(v, (port)->membase + AT91_PDC_TPR)
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#define UART_PUT_TCR(port,v) writel(v, (port)->membase + AT91_PDC_TCR)
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//#define UART_PUT_TNPR(port,v) writel(v, (port)->membase + AT91_PDC_TNPR)
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//#define UART_PUT_TNCR(port,v) writel(v, (port)->membase + AT91_PDC_TNCR)
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static int (*at91_open)(struct uart_port *);
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static void (*at91_close)(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 at91_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 at91_uart_port at91_ports[AT91_NR_UART];
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#ifdef SUPPORT_SYSRQ
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static struct console at91_console;
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#endif
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@ -115,16 +132,19 @@ static u_int at91_tx_empty(struct uart_port *port)
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static void at91_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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/*
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* Errata #39: RTS0 is not internally connected to PA21. We need to drive
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* the pin manually.
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*/
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if (port->mapbase == AT91_VA_BASE_US0) {
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if (mctrl & TIOCM_RTS)
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at91_sys_write(AT91_PIOA + PIO_CODR, AT91_PA21_RTS0);
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else
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at91_sys_write(AT91_PIOA + PIO_SODR, AT91_PA21_RTS0);
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if (arch_identify() == ARCH_ID_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 == AT91_BASE_US0) {
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if (mctrl & TIOCM_RTS)
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at91_sys_write(AT91_PIOA + PIO_CODR, AT91_PA21_RTS0);
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else
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at91_sys_write(AT91_PIOA + PIO_SODR, AT91_PA21_RTS0);
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}
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}
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if (mctrl & TIOCM_RTS)
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@ -137,7 +157,15 @@ static void at91_set_mctrl(struct uart_port *port, u_int mctrl)
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else
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control |= AT91_US_DTRDIS;
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UART_PUT_CR(port,control);
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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) & ~AT91_US_CHMODE;
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if (mctrl & TIOCM_LOOP)
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mode |= AT91_US_CHMODE_LOC_LOOP;
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else
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mode |= AT91_US_CHMODE_NORMAL;
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UART_PUT_MR(port, mode);
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}
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/*
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@ -169,8 +197,9 @@ static u_int at91_get_mctrl(struct uart_port *port)
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*/
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static void at91_stop_tx(struct uart_port *port)
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{
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struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
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UART_PUT_IDR(port, AT91_US_TXRDY);
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port->read_status_mask &= ~AT91_US_TXRDY;
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}
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/*
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@ -178,7 +207,8 @@ static void at91_stop_tx(struct uart_port *port)
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*/
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static void at91_start_tx(struct uart_port *port)
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{
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port->read_status_mask |= AT91_US_TXRDY;
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struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
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UART_PUT_IER(port, AT91_US_TXRDY);
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}
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@ -187,6 +217,8 @@ static void at91_start_tx(struct uart_port *port)
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*/
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static void at91_stop_rx(struct uart_port *port)
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{
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struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
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UART_PUT_IDR(port, AT91_US_RXRDY);
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}
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@ -195,7 +227,6 @@ static void at91_stop_rx(struct uart_port *port)
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*/
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static void at91_enable_ms(struct uart_port *port)
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{
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port->read_status_mask |= (AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC);
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UART_PUT_IER(port, AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC);
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}
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@ -218,8 +249,8 @@ static void at91_rx_chars(struct uart_port *port, struct pt_regs *regs)
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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) & port->read_status_mask;
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while (status & (AT91_US_RXRDY)) {
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status = UART_GET_CSR(port);
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while (status & AT91_US_RXRDY) {
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ch = UART_GET_CHAR(port);
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port->icount.rx++;
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@ -230,40 +261,38 @@ static void at91_rx_chars(struct uart_port *port, struct pt_regs *regs)
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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 & (AT91_US_PARE | AT91_US_FRAME | AT91_US_OVRE))) {
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if (unlikely(status & (AT91_US_PARE | AT91_US_FRAME | AT91_US_OVRE | AT91_US_RXBRK))) {
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UART_PUT_CR(port, AT91_US_RSTSTA); /* clear error */
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if (status & (AT91_US_PARE))
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if (status & AT91_US_RXBRK) {
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status &= ~(AT91_US_PARE | AT91_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 & AT91_US_PARE)
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port->icount.parity++;
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if (status & (AT91_US_FRAME))
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if (status & AT91_US_FRAME)
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port->icount.frame++;
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if (status & (AT91_US_OVRE))
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if (status & AT91_US_OVRE)
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port->icount.overrun++;
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if (status & AT91_US_PARE)
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status &= port->read_status_mask;
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if (status & AT91_US_RXBRK)
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flg = TTY_BREAK;
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else if (status & AT91_US_PARE)
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flg = TTY_PARITY;
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else if (status & AT91_US_FRAME)
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flg = TTY_FRAME;
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if (status & AT91_US_OVRE) {
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/*
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* overrun does *not* affect the character
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* we read from the FIFO
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*/
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tty_insert_flip_char(tty, ch, flg);
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ch = 0;
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flg = TTY_OVERRUN;
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}
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#ifdef SUPPORT_SYSRQ
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port->sysrq = 0;
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#endif
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}
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if (uart_handle_sysrq_char(port, ch, regs))
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goto ignore_char;
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tty_insert_flip_char(tty, ch, flg);
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uart_insert_char(port, status, AT91_US_OVRE, ch, flg);
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ignore_char:
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status = UART_GET_CSR(port) & port->read_status_mask;
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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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@ -308,40 +337,35 @@ static void at91_tx_chars(struct uart_port *port)
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static irqreturn_t at91_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct uart_port *port = dev_id;
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struct at91_uart_port *at91_port = (struct at91_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 & port->read_status_mask;
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if (pending) {
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do {
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if (pending & AT91_US_RXRDY)
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at91_rx_chars(port, regs);
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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 & AT91_US_RXRDY)
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at91_rx_chars(port, regs);
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/* Clear the relevent break bits */
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if (pending & AT91_US_RXBRK) {
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UART_PUT_CR(port, AT91_US_RSTSTA);
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port->icount.brk++;
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uart_handle_break(port);
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}
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// TODO: All reads to CSR will clear these interrupts!
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if (pending & AT91_US_RIIC) port->icount.rng++;
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if (pending & AT91_US_DSRIC) port->icount.dsr++;
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if (pending & AT91_US_DCDIC)
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uart_handle_dcd_change(port, !(status & AT91_US_DCD));
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if (pending & AT91_US_CTSIC)
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uart_handle_cts_change(port, !(status & AT91_US_CTS));
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if (pending & (AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_US_CTSIC))
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wake_up_interruptible(&port->info->delta_msr_wait);
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// TODO: All reads to CSR will clear these interrupts!
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if (pending & AT91_US_RIIC) port->icount.rng++;
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if (pending & AT91_US_DSRIC) port->icount.dsr++;
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if (pending & AT91_US_DCDIC)
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uart_handle_dcd_change(port, !(status & AT91_US_DCD));
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if (pending & AT91_US_CTSIC)
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uart_handle_cts_change(port, !(status & AT91_US_CTS));
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if (pending & (AT91_US_RIIC | AT91_US_DSRIC | AT91_US_DCDIC | AT91_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 & AT91_US_TXRDY)
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at91_tx_chars(port);
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if (pending & AT91_US_TXRDY)
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at91_tx_chars(port);
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if (pass_counter++ > AT91_ISR_PASS_LIMIT)
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break;
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if (pass_counter++ > AT91_ISR_PASS_LIMIT)
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break;
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status = UART_GET_CSR(port);
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pending = status & port->read_status_mask;
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} while (pending);
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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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@ -351,6 +375,7 @@ static irqreturn_t at91_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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*/
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static int at91_startup(struct uart_port *port)
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{
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struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
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int retval;
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/*
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@ -381,14 +406,14 @@ static int at91_startup(struct uart_port *port)
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}
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}
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port->read_status_mask = AT91_US_RXRDY | AT91_US_TXRDY | AT91_US_OVRE
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| AT91_US_FRAME | AT91_US_PARE | AT91_US_RXBRK;
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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, AT91_US_RSTSTA | AT91_US_RSTRX);
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UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN); /* enable xmit & rcvr */
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UART_PUT_IER(port, AT91_US_RXRDY); /* do receive only */
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UART_PUT_IER(port, AT91_US_RXRDY); /* enable receive only */
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return 0;
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}
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@ -397,6 +422,8 @@ static int at91_startup(struct uart_port *port)
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*/
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static void at91_shutdown(struct uart_port *port)
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{
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struct at91_uart_port *at91_port = (struct at91_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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@ -421,21 +448,22 @@ static void at91_shutdown(struct uart_port *port)
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*/
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static void at91_serial_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
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{
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struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
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switch (state) {
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case 0:
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/*
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* Enable the peripheral clock for this serial port.
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* This is called on uart_open() or a resume event.
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*/
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at91_sys_write(AT91_PMC_PCER, 1 << port->irq);
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clk_enable(at91_port->clk);
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break;
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case 3:
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/*
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* Disable the peripheral clock for this serial port.
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* This is called on uart_close() or a suspend event.
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*/
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if (port->irq != AT91_ID_SYS) /* is this a shared clock? */
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at91_sys_write(AT91_PMC_PCDR, 1 << port->irq);
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clk_disable(at91_port->clk);
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break;
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default:
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printk(KERN_ERR "at91_serial: unknown pm %d\n", state);
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@ -494,9 +522,9 @@ static void at91_set_termios(struct uart_port *port, struct termios * termios, s
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spin_lock_irqsave(&port->lock, flags);
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port->read_status_mask |= AT91_US_OVRE;
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port->read_status_mask = AT91_US_OVRE;
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if (termios->c_iflag & INPCK)
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port->read_status_mask |= AT91_US_FRAME | AT91_US_PARE;
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port->read_status_mask |= (AT91_US_FRAME | AT91_US_PARE);
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if (termios->c_iflag & (BRKINT | PARMRK))
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port->read_status_mask |= AT91_US_RXBRK;
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@ -552,7 +580,7 @@ static void at91_set_termios(struct uart_port *port, struct termios * termios, s
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*/
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static const char *at91_type(struct uart_port *port)
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{
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return (port->type == PORT_AT91RM9200) ? "AT91_SERIAL" : NULL;
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return (port->type == PORT_AT91) ? "AT91_SERIAL" : NULL;
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}
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/*
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@ -560,8 +588,15 @@ static const char *at91_type(struct uart_port *port)
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*/
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static void at91_release_port(struct uart_port *port)
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{
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release_mem_region(port->mapbase,
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(port->mapbase == AT91_VA_BASE_DBGU) ? 512 : SZ_16K);
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struct platform_device *pdev = to_platform_device(port->dev);
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int size = pdev->resource[0].end - pdev->resource[0].start + 1;
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release_mem_region(port->mapbase, size);
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if (port->flags & UPF_IOREMAP) {
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iounmap(port->membase);
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port->membase = NULL;
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}
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}
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/*
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@ -569,10 +604,21 @@ static void at91_release_port(struct uart_port *port)
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*/
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static int at91_request_port(struct uart_port *port)
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{
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return request_mem_region(port->mapbase,
|
||||
(port->mapbase == AT91_VA_BASE_DBGU) ? 512 : SZ_16K,
|
||||
"at91_serial") != NULL ? 0 : -EBUSY;
|
||||
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, "at91_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;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -581,7 +627,7 @@ static int at91_request_port(struct uart_port *port)
|
||||
static void at91_config_port(struct uart_port *port, int flags)
|
||||
{
|
||||
if (flags & UART_CONFIG_TYPE) {
|
||||
port->type = PORT_AT91RM9200;
|
||||
port->type = PORT_AT91;
|
||||
at91_request_port(port);
|
||||
}
|
||||
}
|
||||
@ -592,7 +638,7 @@ static void at91_config_port(struct uart_port *port, int flags)
|
||||
static int at91_verify_port(struct uart_port *port, struct serial_struct *ser)
|
||||
{
|
||||
int ret = 0;
|
||||
if (ser->type != PORT_UNKNOWN && ser->type != PORT_AT91RM9200)
|
||||
if (ser->type != PORT_UNKNOWN && ser->type != PORT_AT91)
|
||||
ret = -EINVAL;
|
||||
if (port->irq != ser->irq)
|
||||
ret = -EINVAL;
|
||||
@ -624,33 +670,47 @@ static struct uart_ops at91_pops = {
|
||||
.type = at91_type,
|
||||
.release_port = at91_release_port,
|
||||
.request_port = at91_request_port,
|
||||
.config_port = at91_config_port,
|
||||
.verify_port = at91_verify_port,
|
||||
.config_port = at91_config_port,
|
||||
.verify_port = at91_verify_port,
|
||||
.pm = at91_serial_pm,
|
||||
};
|
||||
|
||||
static struct uart_port at91_ports[AT91_NR_UART];
|
||||
|
||||
void __init at91_init_ports(void)
|
||||
/*
|
||||
* Configure the port from the platform device resource info.
|
||||
*/
|
||||
static void __devinit at91_init_port(struct at91_uart_port *at91_port, struct platform_device *pdev)
|
||||
{
|
||||
static int first = 1;
|
||||
int i;
|
||||
struct uart_port *port = &at91_port->uart;
|
||||
struct at91_uart_data *data = pdev->dev.platform_data;
|
||||
|
||||
if (!first)
|
||||
return;
|
||||
first = 0;
|
||||
port->iotype = UPIO_MEM;
|
||||
port->flags = UPF_BOOT_AUTOCONF;
|
||||
port->ops = &at91_pops;
|
||||
port->fifosize = 1;
|
||||
port->line = pdev->id;
|
||||
port->dev = &pdev->dev;
|
||||
|
||||
for (i = 0; i < AT91_NR_UART; i++) {
|
||||
at91_ports[i].iotype = UPIO_MEM;
|
||||
at91_ports[i].flags = UPF_BOOT_AUTOCONF;
|
||||
at91_ports[i].uartclk = at91_master_clock;
|
||||
at91_ports[i].ops = &at91_pops;
|
||||
at91_ports[i].fifosize = 1;
|
||||
at91_ports[i].line = i;
|
||||
}
|
||||
port->mapbase = pdev->resource[0].start;
|
||||
port->irq = pdev->resource[1].start;
|
||||
|
||||
if (port->mapbase == AT91_VA_BASE_SYS + AT91_DBGU) /* Part of system perpherals - already mapped */
|
||||
port->membase = (void __iomem *) port->mapbase;
|
||||
else {
|
||||
port->flags |= UPF_IOREMAP;
|
||||
port->membase = NULL;
|
||||
}
|
||||
|
||||
if (!at91_port->clk) { /* for console, the clock could already be configured */
|
||||
at91_port->clk = clk_get(&pdev->dev, "usart");
|
||||
clk_enable(at91_port->clk);
|
||||
port->uartclk = clk_get_rate(at91_port->clk);
|
||||
}
|
||||
}
|
||||
|
||||
void __init at91_register_uart_fns(struct at91rm9200_port_fns *fns)
|
||||
/*
|
||||
* Register board-specific modem-control line handlers.
|
||||
*/
|
||||
void __init at91_register_uart_fns(struct at91_port_fns *fns)
|
||||
{
|
||||
if (fns->enable_ms)
|
||||
at91_pops.enable_ms = fns->enable_ms;
|
||||
@ -664,51 +724,6 @@ void __init at91_register_uart_fns(struct at91rm9200_port_fns *fns)
|
||||
at91_pops.set_wake = fns->set_wake;
|
||||
}
|
||||
|
||||
/*
|
||||
* Setup ports.
|
||||
*/
|
||||
void __init at91_register_uart(int idx, int port)
|
||||
{
|
||||
if ((idx < 0) || (idx >= AT91_NR_UART)) {
|
||||
printk(KERN_ERR "%s: bad index number %d\n", __FUNCTION__, idx);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (port) {
|
||||
case 0:
|
||||
at91_ports[idx].membase = (void __iomem *) AT91_VA_BASE_US0;
|
||||
at91_ports[idx].mapbase = AT91_VA_BASE_US0;
|
||||
at91_ports[idx].irq = AT91_ID_US0;
|
||||
AT91_CfgPIO_USART0();
|
||||
break;
|
||||
case 1:
|
||||
at91_ports[idx].membase = (void __iomem *) AT91_VA_BASE_US1;
|
||||
at91_ports[idx].mapbase = AT91_VA_BASE_US1;
|
||||
at91_ports[idx].irq = AT91_ID_US1;
|
||||
AT91_CfgPIO_USART1();
|
||||
break;
|
||||
case 2:
|
||||
at91_ports[idx].membase = (void __iomem *) AT91_VA_BASE_US2;
|
||||
at91_ports[idx].mapbase = AT91_VA_BASE_US2;
|
||||
at91_ports[idx].irq = AT91_ID_US2;
|
||||
AT91_CfgPIO_USART2();
|
||||
break;
|
||||
case 3:
|
||||
at91_ports[idx].membase = (void __iomem *) AT91_VA_BASE_US3;
|
||||
at91_ports[idx].mapbase = AT91_VA_BASE_US3;
|
||||
at91_ports[idx].irq = AT91_ID_US3;
|
||||
AT91_CfgPIO_USART3();
|
||||
break;
|
||||
case 4:
|
||||
at91_ports[idx].membase = (void __iomem *) AT91_VA_BASE_DBGU;
|
||||
at91_ports[idx].mapbase = AT91_VA_BASE_DBGU;
|
||||
at91_ports[idx].irq = AT91_ID_SYS;
|
||||
AT91_CfgPIO_DBGU();
|
||||
break;
|
||||
default:
|
||||
printk(KERN_ERR "%s : bad port number %d\n", __FUNCTION__, port);
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_SERIAL_AT91_CONSOLE
|
||||
static void at91_console_putchar(struct uart_port *port, int ch)
|
||||
@ -723,7 +738,7 @@ static void at91_console_putchar(struct uart_port *port, int ch)
|
||||
*/
|
||||
static void at91_console_write(struct console *co, const char *s, u_int count)
|
||||
{
|
||||
struct uart_port *port = at91_ports + co->index;
|
||||
struct uart_port *port = &at91_ports[co->index].uart;
|
||||
unsigned int status, imr;
|
||||
|
||||
/*
|
||||
@ -778,23 +793,15 @@ static void __init at91_console_get_options(struct uart_port *port, int *baud, i
|
||||
|
||||
static int __init at91_console_setup(struct console *co, char *options)
|
||||
{
|
||||
struct uart_port *port;
|
||||
struct uart_port *port = &at91_ports[co->index].uart;
|
||||
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.
|
||||
*/
|
||||
port = uart_get_console(at91_ports, AT91_NR_UART, co);
|
||||
if (port->membase == 0) /* Port not initialized yet - delay setup */
|
||||
return -ENODEV;
|
||||
|
||||
/*
|
||||
* Enable the serial console, in-case bootloader did not do it.
|
||||
*/
|
||||
at91_sys_write(AT91_PMC_PCER, 1 << port->irq); /* enable clock */
|
||||
UART_PUT_IDR(port, -1); /* disable interrupts */
|
||||
UART_PUT_CR(port, AT91_US_RSTSTA | AT91_US_RSTRX);
|
||||
UART_PUT_CR(port, AT91_US_TXEN | AT91_US_RXEN);
|
||||
@ -821,23 +828,40 @@ static struct console at91_console = {
|
||||
|
||||
#define AT91_CONSOLE_DEVICE &at91_console
|
||||
|
||||
static int __init at91_console_init(void)
|
||||
/*
|
||||
* Early console initialization (before VM subsystem initialized).
|
||||
*/
|
||||
static int __init at91_console_init(void)
|
||||
{
|
||||
at91_init_ports();
|
||||
if (at91_default_console_device) {
|
||||
add_preferred_console(AT91_DEVICENAME, at91_default_console_device->id, NULL);
|
||||
at91_init_port(&(at91_ports[at91_default_console_device->id]), at91_default_console_device);
|
||||
register_console(&at91_console);
|
||||
}
|
||||
|
||||
at91_console.index = at91_console_port;
|
||||
register_console(&at91_console);
|
||||
return 0;
|
||||
}
|
||||
console_initcall(at91_console_init);
|
||||
|
||||
/*
|
||||
* Late console initialization.
|
||||
*/
|
||||
static int __init at91_late_console_init(void)
|
||||
{
|
||||
if (at91_default_console_device && !(at91_console.flags & CON_ENABLED))
|
||||
register_console(&at91_console);
|
||||
|
||||
return 0;
|
||||
}
|
||||
core_initcall(at91_late_console_init);
|
||||
|
||||
#else
|
||||
#define AT91_CONSOLE_DEVICE NULL
|
||||
#endif
|
||||
|
||||
static struct uart_driver at91_uart = {
|
||||
.owner = THIS_MODULE,
|
||||
.driver_name = AT91_DEVICENAME,
|
||||
.driver_name = "at91_serial",
|
||||
.dev_name = AT91_DEVICENAME,
|
||||
.devfs_name = AT91_DEVICENAME,
|
||||
.major = SERIAL_AT91_MAJOR,
|
||||
@ -846,33 +870,106 @@ static struct uart_driver at91_uart = {
|
||||
.cons = AT91_CONSOLE_DEVICE,
|
||||
};
|
||||
|
||||
static int __init at91_serial_init(void)
|
||||
#ifdef CONFIG_PM
|
||||
static int at91_serial_suspend(struct platform_device *pdev, pm_message_t state)
|
||||
{
|
||||
int ret, i;
|
||||
struct uart_port *port = platform_get_drvdata(pdev);
|
||||
struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
|
||||
|
||||
at91_init_ports();
|
||||
|
||||
ret = uart_register_driver(&at91_uart);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
for (i = 0; i < AT91_NR_UART; i++) {
|
||||
if (at91_serial_map[i] >= 0)
|
||||
uart_add_one_port(&at91_uart, &at91_ports[i]);
|
||||
if (device_may_wakeup(&pdev->dev) && !at91_suspend_entering_slow_clock())
|
||||
enable_irq_wake(port->irq);
|
||||
else {
|
||||
disable_irq_wake(port->irq);
|
||||
uart_suspend_port(&at91_uart, port);
|
||||
at91_port->suspended = 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int at91_serial_resume(struct platform_device *pdev)
|
||||
{
|
||||
struct uart_port *port = platform_get_drvdata(pdev);
|
||||
struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
|
||||
|
||||
if (at91_port->suspended) {
|
||||
uart_resume_port(&at91_uart, port);
|
||||
at91_port->suspended = 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define at91_serial_suspend NULL
|
||||
#define at91_serial_resume NULL
|
||||
#endif
|
||||
|
||||
static int __devinit at91_serial_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct at91_uart_port *port;
|
||||
int ret;
|
||||
|
||||
port = &at91_ports[pdev->id];
|
||||
at91_init_port(port, pdev);
|
||||
|
||||
ret = uart_add_one_port(&at91_uart, &port->uart);
|
||||
if (!ret) {
|
||||
device_init_wakeup(&pdev->dev, 1);
|
||||
platform_set_drvdata(pdev, port);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit at91_serial_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct uart_port *port = platform_get_drvdata(pdev);
|
||||
struct at91_uart_port *at91_port = (struct at91_uart_port *) port;
|
||||
int ret = 0;
|
||||
|
||||
clk_disable(at91_port->clk);
|
||||
clk_put(at91_port->clk);
|
||||
|
||||
device_init_wakeup(&pdev->dev, 0);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
if (port) {
|
||||
ret = uart_remove_one_port(&at91_uart, port);
|
||||
kfree(port);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct platform_driver at91_serial_driver = {
|
||||
.probe = at91_serial_probe,
|
||||
.remove = __devexit_p(at91_serial_remove),
|
||||
.suspend = at91_serial_suspend,
|
||||
.resume = at91_serial_resume,
|
||||
.driver = {
|
||||
.name = "at91_usart",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init at91_serial_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = uart_register_driver(&at91_uart);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = platform_driver_register(&at91_serial_driver);
|
||||
if (ret)
|
||||
uart_unregister_driver(&at91_uart);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit at91_serial_exit(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < AT91_NR_UART; i++) {
|
||||
if (at91_serial_map[i] >= 0)
|
||||
uart_remove_one_port(&at91_uart, &at91_ports[i]);
|
||||
}
|
||||
|
||||
platform_driver_unregister(&at91_serial_driver);
|
||||
uart_unregister_driver(&at91_uart);
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user