+++ /dev/null
-/*
- * linux/drivers/char/atmel_serial.c
- *
- * Driver for Atmel AT91 / AT32 Serial ports
- * Copyright (C) 2003 Rick Bronson
- *
- * Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
- * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
- *
- * DMA support added by Chip Coldwell.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-#include <linux/module.h>
-#include <linux/tty.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/serial.h>
-#include <linux/clk.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/tty_flip.h>
-#include <linux/platform_device.h>
-#include <linux/dma-mapping.h>
-#include <linux/atmel_pdc.h>
-#include <linux/atmel_serial.h>
-#include <linux/uaccess.h>
-
-#include <asm/io.h>
-#include <asm/ioctls.h>
-
-#include <asm/mach/serial_at91.h>
-#include <mach/board.h>
-
-#ifdef CONFIG_ARM
-#include <mach/cpu.h>
-#include <mach/gpio.h>
-#endif
-
-#define PDC_BUFFER_SIZE 512
-/* Revisit: We should calculate this based on the actual port settings */
-#define PDC_RX_TIMEOUT (3 * 10) /* 3 bytes */
-
-#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/serial_core.h>
-
-static void atmel_start_rx(struct uart_port *port);
-static void atmel_stop_rx(struct uart_port *port);
-
-#ifdef CONFIG_SERIAL_ATMEL_TTYAT
-
-/* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
- * should coexist with the 8250 driver, such as if we have an external 16C550
- * UART. */
-#define SERIAL_ATMEL_MAJOR 204
-#define MINOR_START 154
-#define ATMEL_DEVICENAME "ttyAT"
-
-#else
-
-/* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
- * name, but it is legally reserved for the 8250 driver. */
-#define SERIAL_ATMEL_MAJOR TTY_MAJOR
-#define MINOR_START 64
-#define ATMEL_DEVICENAME "ttyS"
-
-#endif
-
-#define ATMEL_ISR_PASS_LIMIT 256
-
-/* UART registers. CR is write-only, hence no GET macro */
-#define UART_PUT_CR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_CR)
-#define UART_GET_MR(port) __raw_readl((port)->membase + ATMEL_US_MR)
-#define UART_PUT_MR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_MR)
-#define UART_PUT_IER(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IER)
-#define UART_PUT_IDR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IDR)
-#define UART_GET_IMR(port) __raw_readl((port)->membase + ATMEL_US_IMR)
-#define UART_GET_CSR(port) __raw_readl((port)->membase + ATMEL_US_CSR)
-#define UART_GET_CHAR(port) __raw_readl((port)->membase + ATMEL_US_RHR)
-#define UART_PUT_CHAR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_THR)
-#define UART_GET_BRGR(port) __raw_readl((port)->membase + ATMEL_US_BRGR)
-#define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
-#define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
-#define UART_PUT_TTGR(port, v) __raw_writel(v, (port)->membase + ATMEL_US_TTGR)
-
- /* PDC registers */
-#define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
-#define UART_GET_PTSR(port) __raw_readl((port)->membase + ATMEL_PDC_PTSR)
-
-#define UART_PUT_RPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
-#define UART_GET_RPR(port) __raw_readl((port)->membase + ATMEL_PDC_RPR)
-#define UART_PUT_RCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RCR)
-#define UART_PUT_RNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNPR)
-#define UART_PUT_RNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNCR)
-
-#define UART_PUT_TPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
-#define UART_PUT_TCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
-#define UART_GET_TCR(port) __raw_readl((port)->membase + ATMEL_PDC_TCR)
-
-static int (*atmel_open_hook)(struct uart_port *);
-static void (*atmel_close_hook)(struct uart_port *);
-
-struct atmel_dma_buffer {
- unsigned char *buf;
- dma_addr_t dma_addr;
- unsigned int dma_size;
- unsigned int ofs;
-};
-
-struct atmel_uart_char {
- u16 status;
- u16 ch;
-};
-
-#define ATMEL_SERIAL_RINGSIZE 1024
-
-/*
- * We wrap our port structure around the generic uart_port.
- */
-struct atmel_uart_port {
- struct uart_port uart; /* uart */
- struct clk *clk; /* uart clock */
- int may_wakeup; /* cached value of device_may_wakeup for times we need to disable it */
- u32 backup_imr; /* IMR saved during suspend */
- int break_active; /* break being received */
-
- short use_dma_rx; /* enable PDC receiver */
- short pdc_rx_idx; /* current PDC RX buffer */
- struct atmel_dma_buffer pdc_rx[2]; /* PDC receier */
-
- short use_dma_tx; /* enable PDC transmitter */
- struct atmel_dma_buffer pdc_tx; /* PDC transmitter */
-
- struct tasklet_struct tasklet;
- unsigned int irq_status;
- unsigned int irq_status_prev;
-
- struct circ_buf rx_ring;
-
- struct serial_rs485 rs485; /* rs485 settings */
- unsigned int tx_done_mask;
-};
-
-static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
-
-#ifdef SUPPORT_SYSRQ
-static struct console atmel_console;
-#endif
-
-static inline struct atmel_uart_port *
-to_atmel_uart_port(struct uart_port *uart)
-{
- return container_of(uart, struct atmel_uart_port, uart);
-}
-
-#ifdef CONFIG_SERIAL_ATMEL_PDC
-static bool atmel_use_dma_rx(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- return atmel_port->use_dma_rx;
-}
-
-static bool atmel_use_dma_tx(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- return atmel_port->use_dma_tx;
-}
-#else
-static bool atmel_use_dma_rx(struct uart_port *port)
-{
- return false;
-}
-
-static bool atmel_use_dma_tx(struct uart_port *port)
-{
- return false;
-}
-#endif
-
-/* Enable or disable the rs485 support */
-void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- unsigned int mode;
-
- spin_lock(&port->lock);
-
- /* Disable interrupts */
- UART_PUT_IDR(port, atmel_port->tx_done_mask);
-
- mode = UART_GET_MR(port);
-
- /* Resetting serial mode to RS232 (0x0) */
- mode &= ~ATMEL_US_USMODE;
-
- atmel_port->rs485 = *rs485conf;
-
- if (rs485conf->flags & SER_RS485_ENABLED) {
- dev_dbg(port->dev, "Setting UART to RS485\n");
- atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
- if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
- UART_PUT_TTGR(port, rs485conf->delay_rts_after_send);
- mode |= ATMEL_US_USMODE_RS485;
- } else {
- dev_dbg(port->dev, "Setting UART to RS232\n");
- if (atmel_use_dma_tx(port))
- atmel_port->tx_done_mask = ATMEL_US_ENDTX |
- ATMEL_US_TXBUFE;
- else
- atmel_port->tx_done_mask = ATMEL_US_TXRDY;
- }
- UART_PUT_MR(port, mode);
-
- /* Enable interrupts */
- UART_PUT_IER(port, atmel_port->tx_done_mask);
-
- spin_unlock(&port->lock);
-
-}
-
-/*
- * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
- */
-static u_int atmel_tx_empty(struct uart_port *port)
-{
- return (UART_GET_CSR(port) & ATMEL_US_TXEMPTY) ? TIOCSER_TEMT : 0;
-}
-
-/*
- * Set state of the modem control output lines
- */
-static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
-{
- unsigned int control = 0;
- unsigned int mode;
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
-#ifdef CONFIG_ARCH_AT91RM9200
- if (cpu_is_at91rm9200()) {
- /*
- * AT91RM9200 Errata #39: RTS0 is not internally connected
- * to PA21. We need to drive the pin manually.
- */
- if (port->mapbase == AT91RM9200_BASE_US0) {
- if (mctrl & TIOCM_RTS)
- at91_set_gpio_value(AT91_PIN_PA21, 0);
- else
- at91_set_gpio_value(AT91_PIN_PA21, 1);
- }
- }
-#endif
-
- if (mctrl & TIOCM_RTS)
- control |= ATMEL_US_RTSEN;
- else
- control |= ATMEL_US_RTSDIS;
-
- if (mctrl & TIOCM_DTR)
- control |= ATMEL_US_DTREN;
- else
- control |= ATMEL_US_DTRDIS;
-
- UART_PUT_CR(port, control);
-
- /* Local loopback mode? */
- mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
- if (mctrl & TIOCM_LOOP)
- mode |= ATMEL_US_CHMODE_LOC_LOOP;
- else
- mode |= ATMEL_US_CHMODE_NORMAL;
-
- /* Resetting serial mode to RS232 (0x0) */
- mode &= ~ATMEL_US_USMODE;
-
- if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
- dev_dbg(port->dev, "Setting UART to RS485\n");
- if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
- UART_PUT_TTGR(port,
- atmel_port->rs485.delay_rts_after_send);
- mode |= ATMEL_US_USMODE_RS485;
- } else {
- dev_dbg(port->dev, "Setting UART to RS232\n");
- }
- UART_PUT_MR(port, mode);
-}
-
-/*
- * Get state of the modem control input lines
- */
-static u_int atmel_get_mctrl(struct uart_port *port)
-{
- unsigned int status, ret = 0;
-
- status = UART_GET_CSR(port);
-
- /*
- * The control signals are active low.
- */
- if (!(status & ATMEL_US_DCD))
- ret |= TIOCM_CD;
- if (!(status & ATMEL_US_CTS))
- ret |= TIOCM_CTS;
- if (!(status & ATMEL_US_DSR))
- ret |= TIOCM_DSR;
- if (!(status & ATMEL_US_RI))
- ret |= TIOCM_RI;
-
- return ret;
-}
-
-/*
- * Stop transmitting.
- */
-static void atmel_stop_tx(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (atmel_use_dma_tx(port)) {
- /* disable PDC transmit */
- UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
- }
- /* Disable interrupts */
- UART_PUT_IDR(port, atmel_port->tx_done_mask);
-
- if (atmel_port->rs485.flags & SER_RS485_ENABLED)
- atmel_start_rx(port);
-}
-
-/*
- * Start transmitting.
- */
-static void atmel_start_tx(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (atmel_use_dma_tx(port)) {
- if (UART_GET_PTSR(port) & ATMEL_PDC_TXTEN)
- /* The transmitter is already running. Yes, we
- really need this.*/
- return;
-
- if (atmel_port->rs485.flags & SER_RS485_ENABLED)
- atmel_stop_rx(port);
-
- /* re-enable PDC transmit */
- UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
- }
- /* Enable interrupts */
- UART_PUT_IER(port, atmel_port->tx_done_mask);
-}
-
-/*
- * start receiving - port is in process of being opened.
- */
-static void atmel_start_rx(struct uart_port *port)
-{
- UART_PUT_CR(port, ATMEL_US_RSTSTA); /* reset status and receiver */
-
- if (atmel_use_dma_rx(port)) {
- /* enable PDC controller */
- UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
- port->read_status_mask);
- UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
- } else {
- UART_PUT_IER(port, ATMEL_US_RXRDY);
- }
-}
-
-/*
- * Stop receiving - port is in process of being closed.
- */
-static void atmel_stop_rx(struct uart_port *port)
-{
- if (atmel_use_dma_rx(port)) {
- /* disable PDC receive */
- UART_PUT_PTCR(port, ATMEL_PDC_RXTDIS);
- UART_PUT_IDR(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
- port->read_status_mask);
- } else {
- UART_PUT_IDR(port, ATMEL_US_RXRDY);
- }
-}
-
-/*
- * Enable modem status interrupts
- */
-static void atmel_enable_ms(struct uart_port *port)
-{
- UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC
- | ATMEL_US_DCDIC | ATMEL_US_CTSIC);
-}
-
-/*
- * Control the transmission of a break signal
- */
-static void atmel_break_ctl(struct uart_port *port, int break_state)
-{
- if (break_state != 0)
- UART_PUT_CR(port, ATMEL_US_STTBRK); /* start break */
- else
- UART_PUT_CR(port, ATMEL_US_STPBRK); /* stop break */
-}
-
-/*
- * Stores the incoming character in the ring buffer
- */
-static void
-atmel_buffer_rx_char(struct uart_port *port, unsigned int status,
- unsigned int ch)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct circ_buf *ring = &atmel_port->rx_ring;
- struct atmel_uart_char *c;
-
- if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))
- /* Buffer overflow, ignore char */
- return;
-
- c = &((struct atmel_uart_char *)ring->buf)[ring->head];
- c->status = status;
- c->ch = ch;
-
- /* Make sure the character is stored before we update head. */
- smp_wmb();
-
- ring->head = (ring->head + 1) & (ATMEL_SERIAL_RINGSIZE - 1);
-}
-
-/*
- * Deal with parity, framing and overrun errors.
- */
-static void atmel_pdc_rxerr(struct uart_port *port, unsigned int status)
-{
- /* clear error */
- UART_PUT_CR(port, ATMEL_US_RSTSTA);
-
- if (status & ATMEL_US_RXBRK) {
- /* ignore side-effect */
- status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME);
- port->icount.brk++;
- }
- if (status & ATMEL_US_PARE)
- port->icount.parity++;
- if (status & ATMEL_US_FRAME)
- port->icount.frame++;
- if (status & ATMEL_US_OVRE)
- port->icount.overrun++;
-}
-
-/*
- * Characters received (called from interrupt handler)
- */
-static void atmel_rx_chars(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- unsigned int status, ch;
-
- status = UART_GET_CSR(port);
- while (status & ATMEL_US_RXRDY) {
- ch = UART_GET_CHAR(port);
-
- /*
- * note that the error handling code is
- * out of the main execution path
- */
- if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME
- | ATMEL_US_OVRE | ATMEL_US_RXBRK)
- || atmel_port->break_active)) {
-
- /* clear error */
- UART_PUT_CR(port, ATMEL_US_RSTSTA);
-
- if (status & ATMEL_US_RXBRK
- && !atmel_port->break_active) {
- atmel_port->break_active = 1;
- UART_PUT_IER(port, ATMEL_US_RXBRK);
- } else {
- /*
- * This is either the end-of-break
- * condition or we've received at
- * least one character without RXBRK
- * being set. In both cases, the next
- * RXBRK will indicate start-of-break.
- */
- UART_PUT_IDR(port, ATMEL_US_RXBRK);
- status &= ~ATMEL_US_RXBRK;
- atmel_port->break_active = 0;
- }
- }
-
- atmel_buffer_rx_char(port, status, ch);
- status = UART_GET_CSR(port);
- }
-
- tasklet_schedule(&atmel_port->tasklet);
-}
-
-/*
- * Transmit characters (called from tasklet with TXRDY interrupt
- * disabled)
- */
-static void atmel_tx_chars(struct uart_port *port)
-{
- struct circ_buf *xmit = &port->state->xmit;
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (port->x_char && UART_GET_CSR(port) & atmel_port->tx_done_mask) {
- UART_PUT_CHAR(port, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- }
- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
- return;
-
- while (UART_GET_CSR(port) & atmel_port->tx_done_mask) {
- UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (!uart_circ_empty(xmit))
- /* Enable interrupts */
- UART_PUT_IER(port, atmel_port->tx_done_mask);
-}
-
-/*
- * receive interrupt handler.
- */
-static void
-atmel_handle_receive(struct uart_port *port, unsigned int pending)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (atmel_use_dma_rx(port)) {
- /*
- * PDC receive. Just schedule the tasklet and let it
- * figure out the details.
- *
- * TODO: We're not handling error flags correctly at
- * the moment.
- */
- if (pending & (ATMEL_US_ENDRX | ATMEL_US_TIMEOUT)) {
- UART_PUT_IDR(port, (ATMEL_US_ENDRX
- | ATMEL_US_TIMEOUT));
- tasklet_schedule(&atmel_port->tasklet);
- }
-
- if (pending & (ATMEL_US_RXBRK | ATMEL_US_OVRE |
- ATMEL_US_FRAME | ATMEL_US_PARE))
- atmel_pdc_rxerr(port, pending);
- }
-
- /* Interrupt receive */
- if (pending & ATMEL_US_RXRDY)
- atmel_rx_chars(port);
- else if (pending & ATMEL_US_RXBRK) {
- /*
- * End of break detected. If it came along with a
- * character, atmel_rx_chars will handle it.
- */
- UART_PUT_CR(port, ATMEL_US_RSTSTA);
- UART_PUT_IDR(port, ATMEL_US_RXBRK);
- atmel_port->break_active = 0;
- }
-}
-
-/*
- * transmit interrupt handler. (Transmit is IRQF_NODELAY safe)
- */
-static void
-atmel_handle_transmit(struct uart_port *port, unsigned int pending)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (pending & atmel_port->tx_done_mask) {
- /* Either PDC or interrupt transmission */
- UART_PUT_IDR(port, atmel_port->tx_done_mask);
- tasklet_schedule(&atmel_port->tasklet);
- }
-}
-
-/*
- * status flags interrupt handler.
- */
-static void
-atmel_handle_status(struct uart_port *port, unsigned int pending,
- unsigned int status)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC
- | ATMEL_US_CTSIC)) {
- atmel_port->irq_status = status;
- tasklet_schedule(&atmel_port->tasklet);
- }
-}
-
-/*
- * Interrupt handler
- */
-static irqreturn_t atmel_interrupt(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- unsigned int status, pending, pass_counter = 0;
-
- do {
- status = UART_GET_CSR(port);
- pending = status & UART_GET_IMR(port);
- if (!pending)
- break;
-
- atmel_handle_receive(port, pending);
- atmel_handle_status(port, pending, status);
- atmel_handle_transmit(port, pending);
- } while (pass_counter++ < ATMEL_ISR_PASS_LIMIT);
-
- return pass_counter ? IRQ_HANDLED : IRQ_NONE;
-}
-
-/*
- * Called from tasklet with ENDTX and TXBUFE interrupts disabled.
- */
-static void atmel_tx_dma(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct circ_buf *xmit = &port->state->xmit;
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
- int count;
-
- /* nothing left to transmit? */
- if (UART_GET_TCR(port))
- return;
-
- xmit->tail += pdc->ofs;
- xmit->tail &= UART_XMIT_SIZE - 1;
-
- port->icount.tx += pdc->ofs;
- pdc->ofs = 0;
-
- /* more to transmit - setup next transfer */
-
- /* disable PDC transmit */
- UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
-
- if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
- dma_sync_single_for_device(port->dev,
- pdc->dma_addr,
- pdc->dma_size,
- DMA_TO_DEVICE);
-
- count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
- pdc->ofs = count;
-
- UART_PUT_TPR(port, pdc->dma_addr + xmit->tail);
- UART_PUT_TCR(port, count);
- /* re-enable PDC transmit */
- UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
- /* Enable interrupts */
- UART_PUT_IER(port, atmel_port->tx_done_mask);
- } else {
- if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
- /* DMA done, stop TX, start RX for RS485 */
- atmel_start_rx(port);
- }
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-}
-
-static void atmel_rx_from_ring(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct circ_buf *ring = &atmel_port->rx_ring;
- unsigned int flg;
- unsigned int status;
-
- while (ring->head != ring->tail) {
- struct atmel_uart_char c;
-
- /* Make sure c is loaded after head. */
- smp_rmb();
-
- c = ((struct atmel_uart_char *)ring->buf)[ring->tail];
-
- ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1);
-
- port->icount.rx++;
- status = c.status;
- flg = TTY_NORMAL;
-
- /*
- * note that the error handling code is
- * out of the main execution path
- */
- if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME
- | ATMEL_US_OVRE | ATMEL_US_RXBRK))) {
- if (status & ATMEL_US_RXBRK) {
- /* ignore side-effect */
- status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME);
-
- port->icount.brk++;
- if (uart_handle_break(port))
- continue;
- }
- if (status & ATMEL_US_PARE)
- port->icount.parity++;
- if (status & ATMEL_US_FRAME)
- port->icount.frame++;
- if (status & ATMEL_US_OVRE)
- port->icount.overrun++;
-
- status &= port->read_status_mask;
-
- if (status & ATMEL_US_RXBRK)
- flg = TTY_BREAK;
- else if (status & ATMEL_US_PARE)
- flg = TTY_PARITY;
- else if (status & ATMEL_US_FRAME)
- flg = TTY_FRAME;
- }
-
-
- if (uart_handle_sysrq_char(port, c.ch))
- continue;
-
- uart_insert_char(port, status, ATMEL_US_OVRE, c.ch, flg);
- }
-
- /*
- * Drop the lock here since it might end up calling
- * uart_start(), which takes the lock.
- */
- spin_unlock(&port->lock);
- tty_flip_buffer_push(port->state->port.tty);
- spin_lock(&port->lock);
-}
-
-static void atmel_rx_from_dma(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct tty_struct *tty = port->state->port.tty;
- struct atmel_dma_buffer *pdc;
- int rx_idx = atmel_port->pdc_rx_idx;
- unsigned int head;
- unsigned int tail;
- unsigned int count;
-
- do {
- /* Reset the UART timeout early so that we don't miss one */
- UART_PUT_CR(port, ATMEL_US_STTTO);
-
- pdc = &atmel_port->pdc_rx[rx_idx];
- head = UART_GET_RPR(port) - pdc->dma_addr;
- tail = pdc->ofs;
-
- /* If the PDC has switched buffers, RPR won't contain
- * any address within the current buffer. Since head
- * is unsigned, we just need a one-way comparison to
- * find out.
- *
- * In this case, we just need to consume the entire
- * buffer and resubmit it for DMA. This will clear the
- * ENDRX bit as well, so that we can safely re-enable
- * all interrupts below.
- */
- head = min(head, pdc->dma_size);
-
- if (likely(head != tail)) {
- dma_sync_single_for_cpu(port->dev, pdc->dma_addr,
- pdc->dma_size, DMA_FROM_DEVICE);
-
- /*
- * head will only wrap around when we recycle
- * the DMA buffer, and when that happens, we
- * explicitly set tail to 0. So head will
- * always be greater than tail.
- */
- count = head - tail;
-
- tty_insert_flip_string(tty, pdc->buf + pdc->ofs, count);
-
- dma_sync_single_for_device(port->dev, pdc->dma_addr,
- pdc->dma_size, DMA_FROM_DEVICE);
-
- port->icount.rx += count;
- pdc->ofs = head;
- }
-
- /*
- * If the current buffer is full, we need to check if
- * the next one contains any additional data.
- */
- if (head >= pdc->dma_size) {
- pdc->ofs = 0;
- UART_PUT_RNPR(port, pdc->dma_addr);
- UART_PUT_RNCR(port, pdc->dma_size);
-
- rx_idx = !rx_idx;
- atmel_port->pdc_rx_idx = rx_idx;
- }
- } while (head >= pdc->dma_size);
-
- /*
- * Drop the lock here since it might end up calling
- * uart_start(), which takes the lock.
- */
- spin_unlock(&port->lock);
- tty_flip_buffer_push(tty);
- spin_lock(&port->lock);
-
- UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
-}
-
-/*
- * tasklet handling tty stuff outside the interrupt handler.
- */
-static void atmel_tasklet_func(unsigned long data)
-{
- struct uart_port *port = (struct uart_port *)data;
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- unsigned int status;
- unsigned int status_change;
-
- /* The interrupt handler does not take the lock */
- spin_lock(&port->lock);
-
- if (atmel_use_dma_tx(port))
- atmel_tx_dma(port);
- else
- atmel_tx_chars(port);
-
- status = atmel_port->irq_status;
- status_change = status ^ atmel_port->irq_status_prev;
-
- if (status_change & (ATMEL_US_RI | ATMEL_US_DSR
- | ATMEL_US_DCD | ATMEL_US_CTS)) {
- /* TODO: All reads to CSR will clear these interrupts! */
- if (status_change & ATMEL_US_RI)
- port->icount.rng++;
- if (status_change & ATMEL_US_DSR)
- port->icount.dsr++;
- if (status_change & ATMEL_US_DCD)
- uart_handle_dcd_change(port, !(status & ATMEL_US_DCD));
- if (status_change & ATMEL_US_CTS)
- uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
-
- wake_up_interruptible(&port->state->port.delta_msr_wait);
-
- atmel_port->irq_status_prev = status;
- }
-
- if (atmel_use_dma_rx(port))
- atmel_rx_from_dma(port);
- else
- atmel_rx_from_ring(port);
-
- spin_unlock(&port->lock);
-}
-
-/*
- * Perform initialization and enable port for reception
- */
-static int atmel_startup(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- struct tty_struct *tty = port->state->port.tty;
- int retval;
-
- /*
- * Ensure that no interrupts are enabled otherwise when
- * request_irq() is called we could get stuck trying to
- * handle an unexpected interrupt
- */
- UART_PUT_IDR(port, -1);
-
- /*
- * Allocate the IRQ
- */
- retval = request_irq(port->irq, atmel_interrupt, IRQF_SHARED,
- tty ? tty->name : "atmel_serial", port);
- if (retval) {
- printk("atmel_serial: atmel_startup - Can't get irq\n");
- return retval;
- }
-
- /*
- * Initialize DMA (if necessary)
- */
- if (atmel_use_dma_rx(port)) {
- int i;
-
- for (i = 0; i < 2; i++) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
-
- pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL);
- if (pdc->buf == NULL) {
- if (i != 0) {
- dma_unmap_single(port->dev,
- atmel_port->pdc_rx[0].dma_addr,
- PDC_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- kfree(atmel_port->pdc_rx[0].buf);
- }
- free_irq(port->irq, port);
- return -ENOMEM;
- }
- pdc->dma_addr = dma_map_single(port->dev,
- pdc->buf,
- PDC_BUFFER_SIZE,
- DMA_FROM_DEVICE);
- pdc->dma_size = PDC_BUFFER_SIZE;
- pdc->ofs = 0;
- }
-
- atmel_port->pdc_rx_idx = 0;
-
- UART_PUT_RPR(port, atmel_port->pdc_rx[0].dma_addr);
- UART_PUT_RCR(port, PDC_BUFFER_SIZE);
-
- UART_PUT_RNPR(port, atmel_port->pdc_rx[1].dma_addr);
- UART_PUT_RNCR(port, PDC_BUFFER_SIZE);
- }
- if (atmel_use_dma_tx(port)) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
- struct circ_buf *xmit = &port->state->xmit;
-
- pdc->buf = xmit->buf;
- pdc->dma_addr = dma_map_single(port->dev,
- pdc->buf,
- UART_XMIT_SIZE,
- DMA_TO_DEVICE);
- pdc->dma_size = UART_XMIT_SIZE;
- pdc->ofs = 0;
- }
-
- /*
- * If there is a specific "open" function (to register
- * control line interrupts)
- */
- if (atmel_open_hook) {
- retval = atmel_open_hook(port);
- if (retval) {
- free_irq(port->irq, port);
- return retval;
- }
- }
-
- /* Save current CSR for comparison in atmel_tasklet_func() */
- atmel_port->irq_status_prev = UART_GET_CSR(port);
- atmel_port->irq_status = atmel_port->irq_status_prev;
-
- /*
- * Finally, enable the serial port
- */
- UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
- /* enable xmit & rcvr */
- UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
-
- if (atmel_use_dma_rx(port)) {
- /* set UART timeout */
- UART_PUT_RTOR(port, PDC_RX_TIMEOUT);
- UART_PUT_CR(port, ATMEL_US_STTTO);
-
- UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
- /* enable PDC controller */
- UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
- } else {
- /* enable receive only */
- UART_PUT_IER(port, ATMEL_US_RXRDY);
- }
-
- return 0;
-}
-
-/*
- * Disable the port
- */
-static void atmel_shutdown(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- /*
- * Ensure everything is stopped.
- */
- atmel_stop_rx(port);
- atmel_stop_tx(port);
-
- /*
- * Shut-down the DMA.
- */
- if (atmel_use_dma_rx(port)) {
- int i;
-
- for (i = 0; i < 2; i++) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
-
- dma_unmap_single(port->dev,
- pdc->dma_addr,
- pdc->dma_size,
- DMA_FROM_DEVICE);
- kfree(pdc->buf);
- }
- }
- if (atmel_use_dma_tx(port)) {
- struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
-
- dma_unmap_single(port->dev,
- pdc->dma_addr,
- pdc->dma_size,
- DMA_TO_DEVICE);
- }
-
- /*
- * Disable all interrupts, port and break condition.
- */
- UART_PUT_CR(port, ATMEL_US_RSTSTA);
- UART_PUT_IDR(port, -1);
-
- /*
- * Free the interrupt
- */
- free_irq(port->irq, port);
-
- /*
- * If there is a specific "close" function (to unregister
- * control line interrupts)
- */
- if (atmel_close_hook)
- atmel_close_hook(port);
-}
-
-/*
- * Flush any TX data submitted for DMA. Called when the TX circular
- * buffer is reset.
- */
-static void atmel_flush_buffer(struct uart_port *port)
-{
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- if (atmel_use_dma_tx(port)) {
- UART_PUT_TCR(port, 0);
- atmel_port->pdc_tx.ofs = 0;
- }
-}
-
-/*
- * Power / Clock management.
- */
-static void atmel_serial_pm(struct uart_port *port, unsigned int state,
- unsigned int oldstate)
-{
- struct atmel_uart_port *atmel_port = to_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);
-
- /* re-enable interrupts if we disabled some on suspend */
- UART_PUT_IER(port, atmel_port->backup_imr);
- break;
- case 3:
- /* Back up the interrupt mask and disable all interrupts */
- atmel_port->backup_imr = UART_GET_IMR(port);
- UART_PUT_IDR(port, -1);
-
- /*
- * 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;
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-
- /* Get current mode register */
- mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL
- | ATMEL_US_NBSTOP | ATMEL_US_PAR
- | ATMEL_US_USMODE);
-
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
- quot = uart_get_divisor(port, baud);
-
- if (quot > 65535) { /* BRGR is 16-bit, so switch to slower clock */
- quot /= 8;
- mode |= ATMEL_US_USCLKS_MCK_DIV8;
- }
-
- /* 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) {
- /* Mark or Space parity */
- if (termios->c_cflag & CMSPAR) {
- 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;
-
- /* hardware handshake (RTS/CTS) */
- if (termios->c_cflag & CRTSCTS)
- mode |= ATMEL_US_USMODE_HWHS;
- else
- mode |= ATMEL_US_USMODE_NORMAL;
-
- 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;
-
- if (atmel_use_dma_rx(port))
- /* need to enable error interrupts */
- UART_PUT_IER(port, port->read_status_mask);
-
- /*
- * 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);
-
- /*
- * save/disable interrupts. The tty layer will ensure that the
- * transmitter is empty if requested by the caller, so there's
- * no need to wait for it here.
- */
- imr = UART_GET_IMR(port);
- UART_PUT_IDR(port, -1);
-
- /* disable receiver and transmitter */
- UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
-
- /* Resetting serial mode to RS232 (0x0) */
- mode &= ~ATMEL_US_USMODE;
-
- if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
- dev_dbg(port->dev, "Setting UART to RS485\n");
- if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
- UART_PUT_TTGR(port,
- atmel_port->rs485.delay_rts_after_send);
- mode |= ATMEL_US_USMODE_RS485;
- } else {
- dev_dbg(port->dev, "Setting UART to RS232\n");
- }
-
- /* 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;
-}
-
-#ifdef CONFIG_CONSOLE_POLL
-static int atmel_poll_get_char(struct uart_port *port)
-{
- while (!(UART_GET_CSR(port) & ATMEL_US_RXRDY))
- cpu_relax();
-
- return UART_GET_CHAR(port);
-}
-
-static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
-{
- while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
- cpu_relax();
-
- UART_PUT_CHAR(port, ch);
-}
-#endif
-
-static int
-atmel_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
-{
- struct serial_rs485 rs485conf;
-
- switch (cmd) {
- case TIOCSRS485:
- if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
- sizeof(rs485conf)))
- return -EFAULT;
-
- atmel_config_rs485(port, &rs485conf);
- break;
-
- case TIOCGRS485:
- if (copy_to_user((struct serial_rs485 *) arg,
- &(to_atmel_uart_port(port)->rs485),
- sizeof(rs485conf)))
- return -EFAULT;
- break;
-
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
-}
-
-
-
-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,
- .flush_buffer = atmel_flush_buffer,
- .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,
- .ioctl = atmel_ioctl,
-#ifdef CONFIG_CONSOLE_POLL
- .poll_get_char = atmel_poll_get_char,
- .poll_put_char = atmel_poll_put_char,
-#endif
-};
-
-/*
- * 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;
-
- tasklet_init(&atmel_port->tasklet, atmel_tasklet_func,
- (unsigned long)port);
-
- memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
-
- if (data->regs)
- /* Already mapped by setup code */
- port->membase = data->regs;
- else {
- port->flags |= UPF_IOREMAP;
- port->membase = NULL;
- }
-
- /* for console, the clock could already be configured */
- if (!atmel_port->clk) {
- atmel_port->clk = clk_get(&pdev->dev, "usart");
- clk_enable(atmel_port->clk);
- port->uartclk = clk_get_rate(atmel_port->clk);
- clk_disable(atmel_port->clk);
- /* only enable clock when USART is in use */
- }
-
- atmel_port->use_dma_rx = data->use_dma_rx;
- atmel_port->use_dma_tx = data->use_dma_tx;
- atmel_port->rs485 = data->rs485;
- /* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
- if (atmel_port->rs485.flags & SER_RS485_ENABLED)
- atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
- else if (atmel_use_dma_tx(port)) {
- port->fifosize = PDC_BUFFER_SIZE;
- atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE;
- } else {
- atmel_port->tx_done_mask = ATMEL_US_TXRDY;
- }
-}
-
-/*
- * 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))
- cpu_relax();
- 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;
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
- unsigned int status, imr;
- unsigned int pdc_tx;
-
- /*
- * First, save IMR and then disable interrupts
- */
- imr = UART_GET_IMR(port);
- UART_PUT_IDR(port, ATMEL_US_RXRDY | atmel_port->tx_done_mask);
-
- /* Store PDC transmit status and disable it */
- pdc_tx = UART_GET_PTSR(port) & ATMEL_PDC_TXTEN;
- UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
-
- 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));
-
- /* Restore PDC transmit status */
- if (pdc_tx)
- UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
-
- /* set interrupts back the way they were */
- UART_PUT_IER(port, imr);
-}
-
-/*
- * 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;
-
- /*
- * If the baud rate generator isn't running, the port wasn't
- * initialized by the boot loader.
- */
- quot = UART_GET_BRGR(port) & ATMEL_US_CD;
- if (!quot)
- return;
-
- 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.
- */
- *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 == NULL) {
- /* Port not initialized yet - delay setup */
- return -ENODEV;
- }
-
- clk_enable(atmel_ports[co->index].clk);
-
- UART_PUT_IDR(port, -1);
- 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);
-
-static inline bool atmel_is_console_port(struct uart_port *port)
-{
- return port->cons && port->cons->index == port->line;
-}
-
-#else
-#define ATMEL_CONSOLE_DEVICE NULL
-
-static inline bool atmel_is_console_port(struct uart_port *port)
-{
- return false;
-}
-#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 bool atmel_serial_clk_will_stop(void)
-{
-#ifdef CONFIG_ARCH_AT91
- return at91_suspend_entering_slow_clock();
-#else
- return false;
-#endif
-}
-
-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 = to_atmel_uart_port(port);
-
- if (atmel_is_console_port(port) && console_suspend_enabled) {
- /* Drain the TX shifter */
- while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY))
- cpu_relax();
- }
-
- /* we can not wake up if we're running on slow clock */
- atmel_port->may_wakeup = device_may_wakeup(&pdev->dev);
- if (atmel_serial_clk_will_stop())
- device_set_wakeup_enable(&pdev->dev, 0);
-
- uart_suspend_port(&atmel_uart, port);
-
- 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 = to_atmel_uart_port(port);
-
- uart_resume_port(&atmel_uart, port);
- device_set_wakeup_enable(&pdev->dev, atmel_port->may_wakeup);
-
- 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;
- void *data;
- int ret;
-
- BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
-
- port = &atmel_ports[pdev->id];
- port->backup_imr = 0;
-
- atmel_init_port(port, pdev);
-
- if (!atmel_use_dma_rx(&port->uart)) {
- ret = -ENOMEM;
- data = kmalloc(sizeof(struct atmel_uart_char)
- * ATMEL_SERIAL_RINGSIZE, GFP_KERNEL);
- if (!data)
- goto err_alloc_ring;
- port->rx_ring.buf = data;
- }
-
- ret = uart_add_one_port(&atmel_uart, &port->uart);
- if (ret)
- goto err_add_port;
-
-#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
- if (atmel_is_console_port(&port->uart)
- && ATMEL_CONSOLE_DEVICE->flags & CON_ENABLED) {
- /*
- * The serial core enabled the clock for us, so undo
- * the clk_enable() in atmel_console_setup()
- */
- clk_disable(port->clk);
- }
-#endif
-
- device_init_wakeup(&pdev->dev, 1);
- platform_set_drvdata(pdev, port);
-
- return 0;
-
-err_add_port:
- kfree(port->rx_ring.buf);
- port->rx_ring.buf = NULL;
-err_alloc_ring:
- if (!atmel_is_console_port(&port->uart)) {
- clk_put(port->clk);
- port->clk = NULL;
- }
-
- 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 = to_atmel_uart_port(port);
- int ret = 0;
-
- device_init_wakeup(&pdev->dev, 0);
- platform_set_drvdata(pdev, NULL);
-
- ret = uart_remove_one_port(&atmel_uart, port);
-
- tasklet_kill(&atmel_port->tasklet);
- kfree(atmel_port->rx_ring.buf);
-
- /* "port" is allocated statically, so we shouldn't free it */
-
- clk_put(atmel_port->clk);
-
- 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");
-MODULE_ALIAS("platform:atmel_usart");
git.samba.org / sfrench / cifs-2.6.git / blobdiff