+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * UART driver for PNX8XXX SoCs
- *
- * Author: Per Hallsmark per.hallsmark@mvista.com
- * Ported to 2.6 kernel by EmbeddedAlley
- * Reworked by Vitaly Wool <vitalywool@gmail.com>
- *
- * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
- * Copyright (C) 2000 Deep Blue Solutions Ltd.
- */
-
-#include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/device.h>
-#include <linux/platform_device.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial_core.h>
-#include <linux/serial.h>
-#include <linux/serial_pnx8xxx.h>
-
-#include <asm/io.h>
-#include <asm/irq.h>
-
-/* We'll be using StrongARM sa1100 serial port major/minor */
-#define SERIAL_PNX8XXX_MAJOR 204
-#define MINOR_START 5
-
-#define NR_PORTS 2
-
-#define PNX8XXX_ISR_PASS_LIMIT 256
-
-/*
- * Convert from ignore_status_mask or read_status_mask to FIFO
- * and interrupt status bits
- */
-#define SM_TO_FIFO(x) ((x) >> 10)
-#define SM_TO_ISTAT(x) ((x) & 0x000001ff)
-#define FIFO_TO_SM(x) ((x) << 10)
-#define ISTAT_TO_SM(x) ((x) & 0x000001ff)
-
-/*
- * This is the size of our serial port register set.
- */
-#define UART_PORT_SIZE 0x1000
-
-/*
- * This determines how often we check the modem status signals
- * for any change. They generally aren't connected to an IRQ
- * so we have to poll them. We also check immediately before
- * filling the TX fifo incase CTS has been dropped.
- */
-#define MCTRL_TIMEOUT (250*HZ/1000)
-
-extern struct pnx8xxx_port pnx8xxx_ports[];
-
-static inline int serial_in(struct pnx8xxx_port *sport, int offset)
-{
- return (__raw_readl(sport->port.membase + offset));
-}
-
-static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value)
-{
- __raw_writel(value, sport->port.membase + offset);
-}
-
-/*
- * Handle any change of modem status signal since we were last called.
- */
-static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport)
-{
- unsigned int status, changed;
-
- status = sport->port.ops->get_mctrl(&sport->port);
- changed = status ^ sport->old_status;
-
- if (changed == 0)
- return;
-
- sport->old_status = status;
-
- if (changed & TIOCM_RI)
- sport->port.icount.rng++;
- if (changed & TIOCM_DSR)
- sport->port.icount.dsr++;
- if (changed & TIOCM_CAR)
- uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
- if (changed & TIOCM_CTS)
- uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
-
- wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
-}
-
-/*
- * This is our per-port timeout handler, for checking the
- * modem status signals.
- */
-static void pnx8xxx_timeout(struct timer_list *t)
-{
- struct pnx8xxx_port *sport = from_timer(sport, t, timer);
- unsigned long flags;
-
- if (sport->port.state) {
- spin_lock_irqsave(&sport->port.lock, flags);
- pnx8xxx_mctrl_check(sport);
- spin_unlock_irqrestore(&sport->port.lock, flags);
-
- mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
- }
-}
-
-/*
- * interrupts disabled on entry
- */
-static void pnx8xxx_stop_tx(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- u32 ien;
-
- /* Disable TX intr */
- ien = serial_in(sport, PNX8XXX_IEN);
- serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX);
-
- /* Clear all pending TX intr */
- serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
-}
-
-/*
- * interrupts may not be disabled on entry
- */
-static void pnx8xxx_start_tx(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- u32 ien;
-
- /* Clear all pending TX intr */
- serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
-
- /* Enable TX intr */
- ien = serial_in(sport, PNX8XXX_IEN);
- serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX);
-}
-
-/*
- * Interrupts enabled
- */
-static void pnx8xxx_stop_rx(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- u32 ien;
-
- /* Disable RX intr */
- ien = serial_in(sport, PNX8XXX_IEN);
- serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX);
-
- /* Clear all pending RX intr */
- serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX);
-}
-
-/*
- * Set the modem control timer to fire immediately.
- */
-static void pnx8xxx_enable_ms(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
-
- mod_timer(&sport->timer, jiffies);
-}
-
-static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
-{
- unsigned int status, ch, flg;
-
- status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
- ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
- while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) {
- ch = serial_in(sport, PNX8XXX_FIFO) & 0xff;
-
- sport->port.icount.rx++;
-
- flg = TTY_NORMAL;
-
- /*
- * note that the error handling code is
- * out of the main execution path
- */
- if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE |
- PNX8XXX_UART_FIFO_RXPAR |
- PNX8XXX_UART_FIFO_RXBRK) |
- ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) {
- if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXBRK)) {
- status &= ~(FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
- FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR));
- sport->port.icount.brk++;
- if (uart_handle_break(&sport->port))
- goto ignore_char;
- } else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
- sport->port.icount.parity++;
- else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
- sport->port.icount.frame++;
- if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))
- sport->port.icount.overrun++;
-
- status &= sport->port.read_status_mask;
-
- if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
- flg = TTY_PARITY;
- else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
- flg = TTY_FRAME;
-
- sport->port.sysrq = 0;
- }
-
- if (uart_handle_sysrq_char(&sport->port, ch))
- goto ignore_char;
-
- uart_insert_char(&sport->port, status,
- ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg);
-
- ignore_char:
- serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) |
- PNX8XXX_UART_LCR_RX_NEXT);
- status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
- ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
- }
-
- spin_unlock(&sport->port.lock);
- tty_flip_buffer_push(&sport->port.state->port);
- spin_lock(&sport->port.lock);
-}
-
-static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
-{
- struct circ_buf *xmit = &sport->port.state->xmit;
-
- if (sport->port.x_char) {
- serial_out(sport, PNX8XXX_FIFO, sport->port.x_char);
- sport->port.icount.tx++;
- sport->port.x_char = 0;
- return;
- }
-
- /*
- * Check the modem control lines before
- * transmitting anything.
- */
- pnx8xxx_mctrl_check(sport);
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
- pnx8xxx_stop_tx(&sport->port);
- return;
- }
-
- /*
- * TX while bytes available
- */
- while (((serial_in(sport, PNX8XXX_FIFO) &
- PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) {
- serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- sport->port.icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- }
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(&sport->port);
-
- if (uart_circ_empty(xmit))
- pnx8xxx_stop_tx(&sport->port);
-}
-
-static irqreturn_t pnx8xxx_int(int irq, void *dev_id)
-{
- struct pnx8xxx_port *sport = dev_id;
- unsigned int status;
-
- spin_lock(&sport->port.lock);
- /* Get the interrupts */
- status = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN);
-
- /* Byte or break signal received */
- if (status & (PNX8XXX_UART_INT_RX | PNX8XXX_UART_INT_BREAK))
- pnx8xxx_rx_chars(sport);
-
- /* TX holding register empty - transmit a byte */
- if (status & PNX8XXX_UART_INT_TX)
- pnx8xxx_tx_chars(sport);
-
- /* Clear the ISTAT register */
- serial_out(sport, PNX8XXX_ICLR, status);
-
- spin_unlock(&sport->port.lock);
- return IRQ_HANDLED;
-}
-
-/*
- * Return TIOCSER_TEMT when transmitter is not busy.
- */
-static unsigned int pnx8xxx_tx_empty(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
-
- return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT;
-}
-
-static unsigned int pnx8xxx_get_mctrl(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- unsigned int mctrl = TIOCM_DSR;
- unsigned int msr;
-
- /* REVISIT */
-
- msr = serial_in(sport, PNX8XXX_MCR);
-
- mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0;
- mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0;
-
- return mctrl;
-}
-
-static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
-#if 0 /* FIXME */
- struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
- unsigned int msr;
-#endif
-}
-
-/*
- * Interrupts always disabled.
- */
-static void pnx8xxx_break_ctl(struct uart_port *port, int break_state)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- unsigned long flags;
- unsigned int lcr;
-
- spin_lock_irqsave(&sport->port.lock, flags);
- lcr = serial_in(sport, PNX8XXX_LCR);
- if (break_state == -1)
- lcr |= PNX8XXX_UART_LCR_TXBREAK;
- else
- lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
- serial_out(sport, PNX8XXX_LCR, lcr);
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
-
-static int pnx8xxx_startup(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- int retval;
-
- /*
- * Allocate the IRQ
- */
- retval = request_irq(sport->port.irq, pnx8xxx_int, 0,
- "pnx8xxx-uart", sport);
- if (retval)
- return retval;
-
- /*
- * Finally, clear and enable interrupts
- */
-
- serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
- PNX8XXX_UART_INT_ALLTX);
-
- serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) |
- PNX8XXX_UART_INT_ALLRX |
- PNX8XXX_UART_INT_ALLTX);
-
- /*
- * Enable modem status interrupts
- */
- spin_lock_irq(&sport->port.lock);
- pnx8xxx_enable_ms(&sport->port);
- spin_unlock_irq(&sport->port.lock);
-
- return 0;
-}
-
-static void pnx8xxx_shutdown(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- int lcr;
-
- /*
- * Stop our timer.
- */
- del_timer_sync(&sport->timer);
-
- /*
- * Disable all interrupts
- */
- serial_out(sport, PNX8XXX_IEN, 0);
-
- /*
- * Reset the Tx and Rx FIFOS, disable the break condition
- */
- lcr = serial_in(sport, PNX8XXX_LCR);
- lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
- lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST;
- serial_out(sport, PNX8XXX_LCR, lcr);
-
- /*
- * Clear all interrupts
- */
- serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
- PNX8XXX_UART_INT_ALLTX);
-
- /*
- * Free the interrupt
- */
- free_irq(sport->port.irq, sport);
-}
-
-static void
-pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- unsigned long flags;
- unsigned int lcr_fcr, old_ien, baud, quot;
- unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
-
- /*
- * We only support CS7 and CS8.
- */
- while ((termios->c_cflag & CSIZE) != CS7 &&
- (termios->c_cflag & CSIZE) != CS8) {
- termios->c_cflag &= ~CSIZE;
- termios->c_cflag |= old_csize;
- old_csize = CS8;
- }
-
- if ((termios->c_cflag & CSIZE) == CS8)
- lcr_fcr = PNX8XXX_UART_LCR_8BIT;
- else
- lcr_fcr = 0;
-
- if (termios->c_cflag & CSTOPB)
- lcr_fcr |= PNX8XXX_UART_LCR_2STOPB;
- if (termios->c_cflag & PARENB) {
- lcr_fcr |= PNX8XXX_UART_LCR_PAREN;
- if (!(termios->c_cflag & PARODD))
- lcr_fcr |= PNX8XXX_UART_LCR_PAREVN;
- }
-
- /*
- * Ask the core to calculate the divisor for us.
- */
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
- quot = uart_get_divisor(port, baud);
-
- spin_lock_irqsave(&sport->port.lock, flags);
-
- sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) |
- ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) |
- ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
- if (termios->c_iflag & INPCK)
- sport->port.read_status_mask |=
- FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
- FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
- if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
- sport->port.read_status_mask |=
- ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
-
- /*
- * Characters to ignore
- */
- sport->port.ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- sport->port.ignore_status_mask |=
- FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
- FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
- if (termios->c_iflag & IGNBRK) {
- sport->port.ignore_status_mask |=
- ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
- /*
- * If we're ignoring parity and break indicators,
- * ignore overruns too (for real raw support).
- */
- if (termios->c_iflag & IGNPAR)
- sport->port.ignore_status_mask |=
- ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN);
- }
-
- /*
- * ignore all characters if CREAD is not set
- */
- if ((termios->c_cflag & CREAD) == 0)
- sport->port.ignore_status_mask |=
- ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
-
- del_timer_sync(&sport->timer);
-
- /*
- * Update the per-port timeout.
- */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- /*
- * disable interrupts and drain transmitter
- */
- old_ien = serial_in(sport, PNX8XXX_IEN);
- serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
- PNX8XXX_UART_INT_ALLRX));
-
- while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA)
- barrier();
-
- /* then, disable everything */
- serial_out(sport, PNX8XXX_IEN, 0);
-
- /* Reset the Rx and Tx FIFOs too */
- lcr_fcr |= PNX8XXX_UART_LCR_TX_RST;
- lcr_fcr |= PNX8XXX_UART_LCR_RX_RST;
-
- /* set the parity, stop bits and data size */
- serial_out(sport, PNX8XXX_LCR, lcr_fcr);
-
- /* set the baud rate */
- quot -= 1;
- serial_out(sport, PNX8XXX_BAUD, quot);
-
- serial_out(sport, PNX8XXX_ICLR, -1);
-
- serial_out(sport, PNX8XXX_IEN, old_ien);
-
- if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
- pnx8xxx_enable_ms(&sport->port);
-
- spin_unlock_irqrestore(&sport->port.lock, flags);
-}
-
-static const char *pnx8xxx_type(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
-
- return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL;
-}
-
-/*
- * Release the memory region(s) being used by 'port'.
- */
-static void pnx8xxx_release_port(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
-
- release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
-}
-
-/*
- * Request the memory region(s) being used by 'port'.
- */
-static int pnx8xxx_request_port(struct uart_port *port)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
- "pnx8xxx-uart") != NULL ? 0 : -EBUSY;
-}
-
-/*
- * Configure/autoconfigure the port.
- */
-static void pnx8xxx_config_port(struct uart_port *port, int flags)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
-
- if (flags & UART_CONFIG_TYPE &&
- pnx8xxx_request_port(&sport->port) == 0)
- sport->port.type = PORT_PNX8XXX;
-}
-
-/*
- * Verify the new serial_struct (for TIOCSSERIAL).
- * The only change we allow are to the flags and type, and
- * even then only between PORT_PNX8XXX and PORT_UNKNOWN
- */
-static int
-pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- int ret = 0;
-
- if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX)
- ret = -EINVAL;
- if (sport->port.irq != ser->irq)
- ret = -EINVAL;
- if (ser->io_type != SERIAL_IO_MEM)
- ret = -EINVAL;
- if (sport->port.uartclk / 16 != ser->baud_base)
- ret = -EINVAL;
- if ((void *)sport->port.mapbase != ser->iomem_base)
- ret = -EINVAL;
- if (sport->port.iobase != ser->port)
- ret = -EINVAL;
- if (ser->hub6 != 0)
- ret = -EINVAL;
- return ret;
-}
-
-static const struct uart_ops pnx8xxx_pops = {
- .tx_empty = pnx8xxx_tx_empty,
- .set_mctrl = pnx8xxx_set_mctrl,
- .get_mctrl = pnx8xxx_get_mctrl,
- .stop_tx = pnx8xxx_stop_tx,
- .start_tx = pnx8xxx_start_tx,
- .stop_rx = pnx8xxx_stop_rx,
- .enable_ms = pnx8xxx_enable_ms,
- .break_ctl = pnx8xxx_break_ctl,
- .startup = pnx8xxx_startup,
- .shutdown = pnx8xxx_shutdown,
- .set_termios = pnx8xxx_set_termios,
- .type = pnx8xxx_type,
- .release_port = pnx8xxx_release_port,
- .request_port = pnx8xxx_request_port,
- .config_port = pnx8xxx_config_port,
- .verify_port = pnx8xxx_verify_port,
-};
-
-
-/*
- * Setup the PNX8XXX serial ports.
- *
- * Note also that we support "console=ttySx" where "x" is either 0 or 1.
- */
-static void __init pnx8xxx_init_ports(void)
-{
- static int first = 1;
- int i;
-
- if (!first)
- return;
- first = 0;
-
- for (i = 0; i < NR_PORTS; i++) {
- timer_setup(&pnx8xxx_ports[i].timer, pnx8xxx_timeout, 0);
- pnx8xxx_ports[i].port.ops = &pnx8xxx_pops;
- }
-}
-
-#ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE
-
-static void pnx8xxx_console_putchar(struct uart_port *port, int ch)
-{
- struct pnx8xxx_port *sport =
- container_of(port, struct pnx8xxx_port, port);
- int status;
-
- do {
- /* Wait for UART_TX register to empty */
- status = serial_in(sport, PNX8XXX_FIFO);
- } while (status & PNX8XXX_UART_FIFO_TXFIFO);
- serial_out(sport, PNX8XXX_FIFO, ch);
-}
-
-/*
- * Interrupts are disabled on entering
- */static void
-pnx8xxx_console_write(struct console *co, const char *s, unsigned int count)
-{
- struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index];
- unsigned int old_ien, status;
-
- /*
- * First, save IEN and then disable interrupts
- */
- old_ien = serial_in(sport, PNX8XXX_IEN);
- serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
- PNX8XXX_UART_INT_ALLRX));
-
- uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar);
-
- /*
- * Finally, wait for transmitter to become empty
- * and restore IEN
- */
- do {
- /* Wait for UART_TX register to empty */
- status = serial_in(sport, PNX8XXX_FIFO);
- } while (status & PNX8XXX_UART_FIFO_TXFIFO);
-
- /* Clear TX and EMPTY interrupt */
- serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX |
- PNX8XXX_UART_INT_EMPTY);
-
- serial_out(sport, PNX8XXX_IEN, old_ien);
-}
-
-static int __init
-pnx8xxx_console_setup(struct console *co, char *options)
-{
- struct pnx8xxx_port *sport;
- int baud = 38400;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- /*
- * Check whether an invalid uart number has been specified, and
- * if so, search for the first available port that does have
- * console support.
- */
- if (co->index == -1 || co->index >= NR_PORTS)
- co->index = 0;
- sport = &pnx8xxx_ports[co->index];
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
-
- return uart_set_options(&sport->port, co, baud, parity, bits, flow);
-}
-
-static struct uart_driver pnx8xxx_reg;
-static struct console pnx8xxx_console = {
- .name = "ttyS",
- .write = pnx8xxx_console_write,
- .device = uart_console_device,
- .setup = pnx8xxx_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &pnx8xxx_reg,
-};
-
-static int __init pnx8xxx_rs_console_init(void)
-{
- pnx8xxx_init_ports();
- register_console(&pnx8xxx_console);
- return 0;
-}
-console_initcall(pnx8xxx_rs_console_init);
-
-#define PNX8XXX_CONSOLE &pnx8xxx_console
-#else
-#define PNX8XXX_CONSOLE NULL
-#endif
-
-static struct uart_driver pnx8xxx_reg = {
- .owner = THIS_MODULE,
- .driver_name = "ttyS",
- .dev_name = "ttyS",
- .major = SERIAL_PNX8XXX_MAJOR,
- .minor = MINOR_START,
- .nr = NR_PORTS,
- .cons = PNX8XXX_CONSOLE,
-};
-
-static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
-
- return uart_suspend_port(&pnx8xxx_reg, &sport->port);
-}
-
-static int pnx8xxx_serial_resume(struct platform_device *pdev)
-{
- struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
-
- return uart_resume_port(&pnx8xxx_reg, &sport->port);
-}
-
-static int pnx8xxx_serial_probe(struct platform_device *pdev)
-{
- struct resource *res = pdev->resource;
- int i;
-
- for (i = 0; i < pdev->num_resources; i++, res++) {
- if (!(res->flags & IORESOURCE_MEM))
- continue;
-
- for (i = 0; i < NR_PORTS; i++) {
- if (pnx8xxx_ports[i].port.mapbase != res->start)
- continue;
-
- pnx8xxx_ports[i].port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_PNX8XXX_CONSOLE);
- pnx8xxx_ports[i].port.dev = &pdev->dev;
- uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port);
- platform_set_drvdata(pdev, &pnx8xxx_ports[i]);
- break;
- }
- }
-
- return 0;
-}
-
-static int pnx8xxx_serial_remove(struct platform_device *pdev)
-{
- struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
-
- if (sport)
- uart_remove_one_port(&pnx8xxx_reg, &sport->port);
-
- return 0;
-}
-
-static struct platform_driver pnx8xxx_serial_driver = {
- .driver = {
- .name = "pnx8xxx-uart",
- },
- .probe = pnx8xxx_serial_probe,
- .remove = pnx8xxx_serial_remove,
- .suspend = pnx8xxx_serial_suspend,
- .resume = pnx8xxx_serial_resume,
-};
-
-static int __init pnx8xxx_serial_init(void)
-{
- int ret;
-
- printk(KERN_INFO "Serial: PNX8XXX driver\n");
-
- pnx8xxx_init_ports();
-
- ret = uart_register_driver(&pnx8xxx_reg);
- if (ret == 0) {
- ret = platform_driver_register(&pnx8xxx_serial_driver);
- if (ret)
- uart_unregister_driver(&pnx8xxx_reg);
- }
- return ret;
-}
-
-static void __exit pnx8xxx_serial_exit(void)
-{
- platform_driver_unregister(&pnx8xxx_serial_driver);
- uart_unregister_driver(&pnx8xxx_reg);
-}
-
-module_init(pnx8xxx_serial_init);
-module_exit(pnx8xxx_serial_exit);
-
-MODULE_AUTHOR("Embedded Alley Solutions, Inc.");
-MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR);
-MODULE_ALIAS("platform:pnx8xxx-uart");
projects / platform / kernel / linux-starfive.git / commitdiff