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path: root/drivers/tty/serial/sa1100.c
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Diffstat (limited to 'drivers/tty/serial/sa1100.c')
-rw-r--r--drivers/tty/serial/sa1100.c918
1 files changed, 918 insertions, 0 deletions
diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
new file mode 100644
index 00000000000..2199d819a98
--- /dev/null
+++ b/drivers/tty/serial/sa1100.c
@@ -0,0 +1,918 @@
+/*
+ * linux/drivers/char/sa1100.c
+ *
+ * Driver for SA11x0 serial ports
+ *
+ * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *
+ * 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
+ */
+
+#if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.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/io.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <asm/mach/serial_sa1100.h>
+
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_SA1100_MAJOR 204
+#define MINOR_START 5
+
+#define NR_PORTS 3
+
+#define SA1100_ISR_PASS_LIMIT 256
+
+/*
+ * Convert from ignore_status_mask or read_status_mask to UTSR[01]
+ */
+#define SM_TO_UTSR0(x) ((x) & 0xff)
+#define SM_TO_UTSR1(x) ((x) >> 8)
+#define UTSR0_TO_SM(x) ((x))
+#define UTSR1_TO_SM(x) ((x) << 8)
+
+#define UART_GET_UTCR0(sport) __raw_readl((sport)->port.membase + UTCR0)
+#define UART_GET_UTCR1(sport) __raw_readl((sport)->port.membase + UTCR1)
+#define UART_GET_UTCR2(sport) __raw_readl((sport)->port.membase + UTCR2)
+#define UART_GET_UTCR3(sport) __raw_readl((sport)->port.membase + UTCR3)
+#define UART_GET_UTSR0(sport) __raw_readl((sport)->port.membase + UTSR0)
+#define UART_GET_UTSR1(sport) __raw_readl((sport)->port.membase + UTSR1)
+#define UART_GET_CHAR(sport) __raw_readl((sport)->port.membase + UTDR)
+
+#define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
+#define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
+#define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
+#define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
+#define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
+#define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
+#define UART_PUT_CHAR(sport,v) __raw_writel((v),(sport)->port.membase + UTDR)
+
+/*
+ * This is the size of our serial port register set.
+ */
+#define UART_PORT_SIZE 0x24
+
+/*
+ * 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)
+
+struct sa1100_port {
+ struct uart_port port;
+ struct timer_list timer;
+ unsigned int old_status;
+};
+
+/*
+ * Handle any change of modem status signal since we were last called.
+ */
+static void sa1100_mctrl_check(struct sa1100_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 sa1100_timeout(unsigned long data)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)data;
+ unsigned long flags;
+
+ if (sport->port.state) {
+ spin_lock_irqsave(&sport->port.lock, flags);
+ sa1100_mctrl_check(sport);
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+
+ mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
+ }
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void sa1100_stop_tx(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ u32 utcr3;
+
+ utcr3 = UART_GET_UTCR3(sport);
+ UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
+ sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
+}
+
+/*
+ * port locked and interrupts disabled
+ */
+static void sa1100_start_tx(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ u32 utcr3;
+
+ utcr3 = UART_GET_UTCR3(sport);
+ sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
+ UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
+}
+
+/*
+ * Interrupts enabled
+ */
+static void sa1100_stop_rx(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ u32 utcr3;
+
+ utcr3 = UART_GET_UTCR3(sport);
+ UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
+}
+
+/*
+ * Set the modem control timer to fire immediately.
+ */
+static void sa1100_enable_ms(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ mod_timer(&sport->timer, jiffies);
+}
+
+static void
+sa1100_rx_chars(struct sa1100_port *sport)
+{
+ struct tty_struct *tty = sport->port.state->port.tty;
+ unsigned int status, ch, flg;
+
+ status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
+ UTSR0_TO_SM(UART_GET_UTSR0(sport));
+ while (status & UTSR1_TO_SM(UTSR1_RNE)) {
+ ch = UART_GET_CHAR(sport);
+
+ sport->port.icount.rx++;
+
+ flg = TTY_NORMAL;
+
+ /*
+ * note that the error handling code is
+ * out of the main execution path
+ */
+ if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
+ if (status & UTSR1_TO_SM(UTSR1_PRE))
+ sport->port.icount.parity++;
+ else if (status & UTSR1_TO_SM(UTSR1_FRE))
+ sport->port.icount.frame++;
+ if (status & UTSR1_TO_SM(UTSR1_ROR))
+ sport->port.icount.overrun++;
+
+ status &= sport->port.read_status_mask;
+
+ if (status & UTSR1_TO_SM(UTSR1_PRE))
+ flg = TTY_PARITY;
+ else if (status & UTSR1_TO_SM(UTSR1_FRE))
+ flg = TTY_FRAME;
+
+#ifdef SUPPORT_SYSRQ
+ sport->port.sysrq = 0;
+#endif
+ }
+
+ if (uart_handle_sysrq_char(&sport->port, ch))
+ goto ignore_char;
+
+ uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
+
+ ignore_char:
+ status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
+ UTSR0_TO_SM(UART_GET_UTSR0(sport));
+ }
+ tty_flip_buffer_push(tty);
+}
+
+static void sa1100_tx_chars(struct sa1100_port *sport)
+{
+ struct circ_buf *xmit = &sport->port.state->xmit;
+
+ if (sport->port.x_char) {
+ UART_PUT_CHAR(sport, sport->port.x_char);
+ sport->port.icount.tx++;
+ sport->port.x_char = 0;
+ return;
+ }
+
+ /*
+ * Check the modem control lines before
+ * transmitting anything.
+ */
+ sa1100_mctrl_check(sport);
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+ sa1100_stop_tx(&sport->port);
+ return;
+ }
+
+ /*
+ * Tried using FIFO (not checking TNF) for fifo fill:
+ * still had the '4 bytes repeated' problem.
+ */
+ while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
+ UART_PUT_CHAR(sport, 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))
+ sa1100_stop_tx(&sport->port);
+}
+
+static irqreturn_t sa1100_int(int irq, void *dev_id)
+{
+ struct sa1100_port *sport = dev_id;
+ unsigned int status, pass_counter = 0;
+
+ spin_lock(&sport->port.lock);
+ status = UART_GET_UTSR0(sport);
+ status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
+ do {
+ if (status & (UTSR0_RFS | UTSR0_RID)) {
+ /* Clear the receiver idle bit, if set */
+ if (status & UTSR0_RID)
+ UART_PUT_UTSR0(sport, UTSR0_RID);
+ sa1100_rx_chars(sport);
+ }
+
+ /* Clear the relevant break bits */
+ if (status & (UTSR0_RBB | UTSR0_REB))
+ UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
+
+ if (status & UTSR0_RBB)
+ sport->port.icount.brk++;
+
+ if (status & UTSR0_REB)
+ uart_handle_break(&sport->port);
+
+ if (status & UTSR0_TFS)
+ sa1100_tx_chars(sport);
+ if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
+ break;
+ status = UART_GET_UTSR0(sport);
+ status &= SM_TO_UTSR0(sport->port.read_status_mask) |
+ ~UTSR0_TFS;
+ } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
+ spin_unlock(&sport->port.lock);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy.
+ */
+static unsigned int sa1100_tx_empty(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int sa1100_get_mctrl(struct uart_port *port)
+{
+ return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+/*
+ * Interrupts always disabled.
+ */
+static void sa1100_break_ctl(struct uart_port *port, int break_state)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ unsigned long flags;
+ unsigned int utcr3;
+
+ spin_lock_irqsave(&sport->port.lock, flags);
+ utcr3 = UART_GET_UTCR3(sport);
+ if (break_state == -1)
+ utcr3 |= UTCR3_BRK;
+ else
+ utcr3 &= ~UTCR3_BRK;
+ UART_PUT_UTCR3(sport, utcr3);
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static int sa1100_startup(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ int retval;
+
+ /*
+ * Allocate the IRQ
+ */
+ retval = request_irq(sport->port.irq, sa1100_int, 0,
+ "sa11x0-uart", sport);
+ if (retval)
+ return retval;
+
+ /*
+ * Finally, clear and enable interrupts
+ */
+ UART_PUT_UTSR0(sport, -1);
+ UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
+
+ /*
+ * Enable modem status interrupts
+ */
+ spin_lock_irq(&sport->port.lock);
+ sa1100_enable_ms(&sport->port);
+ spin_unlock_irq(&sport->port.lock);
+
+ return 0;
+}
+
+static void sa1100_shutdown(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ /*
+ * Stop our timer.
+ */
+ del_timer_sync(&sport->timer);
+
+ /*
+ * Free the interrupt
+ */
+ free_irq(sport->port.irq, sport);
+
+ /*
+ * Disable all interrupts, port and break condition.
+ */
+ UART_PUT_UTCR3(sport, 0);
+}
+
+static void
+sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ unsigned long flags;
+ unsigned int utcr0, old_utcr3, 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)
+ utcr0 = UTCR0_DSS;
+ else
+ utcr0 = 0;
+
+ if (termios->c_cflag & CSTOPB)
+ utcr0 |= UTCR0_SBS;
+ if (termios->c_cflag & PARENB) {
+ utcr0 |= UTCR0_PE;
+ if (!(termios->c_cflag & PARODD))
+ utcr0 |= UTCR0_OES;
+ }
+
+ /*
+ * 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 &= UTSR0_TO_SM(UTSR0_TFS);
+ sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
+ if (termios->c_iflag & INPCK)
+ sport->port.read_status_mask |=
+ UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ sport->port.read_status_mask |=
+ UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
+
+ /*
+ * Characters to ignore
+ */
+ sport->port.ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ sport->port.ignore_status_mask |=
+ UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
+ if (termios->c_iflag & IGNBRK) {
+ sport->port.ignore_status_mask |=
+ UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
+ /*
+ * 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 |=
+ UTSR1_TO_SM(UTSR1_ROR);
+ }
+
+ del_timer_sync(&sport->timer);
+
+ /*
+ * Update the per-port timeout.
+ */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ /*
+ * disable interrupts and drain transmitter
+ */
+ old_utcr3 = UART_GET_UTCR3(sport);
+ UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
+
+ while (UART_GET_UTSR1(sport) & UTSR1_TBY)
+ barrier();
+
+ /* then, disable everything */
+ UART_PUT_UTCR3(sport, 0);
+
+ /* set the parity, stop bits and data size */
+ UART_PUT_UTCR0(sport, utcr0);
+
+ /* set the baud rate */
+ quot -= 1;
+ UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
+ UART_PUT_UTCR2(sport, (quot & 0xff));
+
+ UART_PUT_UTSR0(sport, -1);
+
+ UART_PUT_UTCR3(sport, old_utcr3);
+
+ if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
+ sa1100_enable_ms(&sport->port);
+
+ spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static const char *sa1100_type(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void sa1100_release_port(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int sa1100_request_port(struct uart_port *port)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
+ "sa11x0-uart") != NULL ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void sa1100_config_port(struct uart_port *port, int flags)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ if (flags & UART_CONFIG_TYPE &&
+ sa1100_request_port(&sport->port) == 0)
+ sport->port.type = PORT_SA1100;
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ * The only change we allow are to the flags and type, and
+ * even then only between PORT_SA1100 and PORT_UNKNOWN
+ */
+static int
+sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+ int ret = 0;
+
+ if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
+ 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 struct uart_ops sa1100_pops = {
+ .tx_empty = sa1100_tx_empty,
+ .set_mctrl = sa1100_set_mctrl,
+ .get_mctrl = sa1100_get_mctrl,
+ .stop_tx = sa1100_stop_tx,
+ .start_tx = sa1100_start_tx,
+ .stop_rx = sa1100_stop_rx,
+ .enable_ms = sa1100_enable_ms,
+ .break_ctl = sa1100_break_ctl,
+ .startup = sa1100_startup,
+ .shutdown = sa1100_shutdown,
+ .set_termios = sa1100_set_termios,
+ .type = sa1100_type,
+ .release_port = sa1100_release_port,
+ .request_port = sa1100_request_port,
+ .config_port = sa1100_config_port,
+ .verify_port = sa1100_verify_port,
+};
+
+static struct sa1100_port sa1100_ports[NR_PORTS];
+
+/*
+ * Setup the SA1100 serial ports. Note that we don't include the IrDA
+ * port here since we have our own SIR/FIR driver (see drivers/net/irda)
+ *
+ * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
+ * Which serial port this ends up being depends on the machine you're
+ * running this kernel on. I'm not convinced that this is a good idea,
+ * but that's the way it traditionally works.
+ *
+ * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
+ * used here.
+ */
+static void __init sa1100_init_ports(void)
+{
+ static int first = 1;
+ int i;
+
+ if (!first)
+ return;
+ first = 0;
+
+ for (i = 0; i < NR_PORTS; i++) {
+ sa1100_ports[i].port.uartclk = 3686400;
+ sa1100_ports[i].port.ops = &sa1100_pops;
+ sa1100_ports[i].port.fifosize = 8;
+ sa1100_ports[i].port.line = i;
+ sa1100_ports[i].port.iotype = UPIO_MEM;
+ init_timer(&sa1100_ports[i].timer);
+ sa1100_ports[i].timer.function = sa1100_timeout;
+ sa1100_ports[i].timer.data = (unsigned long)&sa1100_ports[i];
+ }
+
+ /*
+ * make transmit lines outputs, so that when the port
+ * is closed, the output is in the MARK state.
+ */
+ PPDR |= PPC_TXD1 | PPC_TXD3;
+ PPSR |= PPC_TXD1 | PPC_TXD3;
+}
+
+void __devinit sa1100_register_uart_fns(struct sa1100_port_fns *fns)
+{
+ if (fns->get_mctrl)
+ sa1100_pops.get_mctrl = fns->get_mctrl;
+ if (fns->set_mctrl)
+ sa1100_pops.set_mctrl = fns->set_mctrl;
+
+ sa1100_pops.pm = fns->pm;
+ sa1100_pops.set_wake = fns->set_wake;
+}
+
+void __init sa1100_register_uart(int idx, int port)
+{
+ if (idx >= NR_PORTS) {
+ printk(KERN_ERR "%s: bad index number %d\n", __func__, idx);
+ return;
+ }
+
+ switch (port) {
+ case 1:
+ sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
+ sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
+ sa1100_ports[idx].port.irq = IRQ_Ser1UART;
+ sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
+ break;
+
+ case 2:
+ sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
+ sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
+ sa1100_ports[idx].port.irq = IRQ_Ser2ICP;
+ sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
+ break;
+
+ case 3:
+ sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
+ sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
+ sa1100_ports[idx].port.irq = IRQ_Ser3UART;
+ sa1100_ports[idx].port.flags = UPF_BOOT_AUTOCONF;
+ break;
+
+ default:
+ printk(KERN_ERR "%s: bad port number %d\n", __func__, port);
+ }
+}
+
+
+#ifdef CONFIG_SERIAL_SA1100_CONSOLE
+static void sa1100_console_putchar(struct uart_port *port, int ch)
+{
+ struct sa1100_port *sport = (struct sa1100_port *)port;
+
+ while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
+ barrier();
+ UART_PUT_CHAR(sport, ch);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+sa1100_console_write(struct console *co, const char *s, unsigned int count)
+{
+ struct sa1100_port *sport = &sa1100_ports[co->index];
+ unsigned int old_utcr3, status;
+
+ /*
+ * First, save UTCR3 and then disable interrupts
+ */
+ old_utcr3 = UART_GET_UTCR3(sport);
+ UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
+ UTCR3_TXE);
+
+ uart_console_write(&sport->port, s, count, sa1100_console_putchar);
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore UTCR3
+ */
+ do {
+ status = UART_GET_UTSR1(sport);
+ } while (status & UTSR1_TBY);
+ UART_PUT_UTCR3(sport, old_utcr3);
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init
+sa1100_console_get_options(struct sa1100_port *sport, int *baud,
+ int *parity, int *bits)
+{
+ unsigned int utcr3;
+
+ utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
+ if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
+ /* ok, the port was enabled */
+ unsigned int utcr0, quot;
+
+ utcr0 = UART_GET_UTCR0(sport);
+
+ *parity = 'n';
+ if (utcr0 & UTCR0_PE) {
+ if (utcr0 & UTCR0_OES)
+ *parity = 'e';
+ else
+ *parity = 'o';
+ }
+
+ if (utcr0 & UTCR0_DSS)
+ *bits = 8;
+ else
+ *bits = 7;
+
+ quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
+ quot &= 0xfff;
+ *baud = sport->port.uartclk / (16 * (quot + 1));
+ }
+}
+
+static int __init
+sa1100_console_setup(struct console *co, char *options)
+{
+ struct sa1100_port *sport;
+ int baud = 9600;
+ 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 = &sa1100_ports[co->index];
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+ else
+ sa1100_console_get_options(sport, &baud, &parity, &bits);
+
+ return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver sa1100_reg;
+static struct console sa1100_console = {
+ .name = "ttySA",
+ .write = sa1100_console_write,
+ .device = uart_console_device,
+ .setup = sa1100_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &sa1100_reg,
+};
+
+static int __init sa1100_rs_console_init(void)
+{
+ sa1100_init_ports();
+ register_console(&sa1100_console);
+ return 0;
+}
+console_initcall(sa1100_rs_console_init);
+
+#define SA1100_CONSOLE &sa1100_console
+#else
+#define SA1100_CONSOLE NULL
+#endif
+
+static struct uart_driver sa1100_reg = {
+ .owner = THIS_MODULE,
+ .driver_name = "ttySA",
+ .dev_name = "ttySA",
+ .major = SERIAL_SA1100_MAJOR,
+ .minor = MINOR_START,
+ .nr = NR_PORTS,
+ .cons = SA1100_CONSOLE,
+};
+
+static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct sa1100_port *sport = platform_get_drvdata(dev);
+
+ if (sport)
+ uart_suspend_port(&sa1100_reg, &sport->port);
+
+ return 0;
+}
+
+static int sa1100_serial_resume(struct platform_device *dev)
+{
+ struct sa1100_port *sport = platform_get_drvdata(dev);
+
+ if (sport)
+ uart_resume_port(&sa1100_reg, &sport->port);
+
+ return 0;
+}
+
+static int sa1100_serial_probe(struct platform_device *dev)
+{
+ struct resource *res = dev->resource;
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++, res++)
+ if (res->flags & IORESOURCE_MEM)
+ break;
+
+ if (i < dev->num_resources) {
+ for (i = 0; i < NR_PORTS; i++) {
+ if (sa1100_ports[i].port.mapbase != res->start)
+ continue;
+
+ sa1100_ports[i].port.dev = &dev->dev;
+ uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
+ platform_set_drvdata(dev, &sa1100_ports[i]);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int sa1100_serial_remove(struct platform_device *pdev)
+{
+ struct sa1100_port *sport = platform_get_drvdata(pdev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ if (sport)
+ uart_remove_one_port(&sa1100_reg, &sport->port);
+
+ return 0;
+}
+
+static struct platform_driver sa11x0_serial_driver = {
+ .probe = sa1100_serial_probe,
+ .remove = sa1100_serial_remove,
+ .suspend = sa1100_serial_suspend,
+ .resume = sa1100_serial_resume,
+ .driver = {
+ .name = "sa11x0-uart",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init sa1100_serial_init(void)
+{
+ int ret;
+
+ printk(KERN_INFO "Serial: SA11x0 driver\n");
+
+ sa1100_init_ports();
+
+ ret = uart_register_driver(&sa1100_reg);
+ if (ret == 0) {
+ ret = platform_driver_register(&sa11x0_serial_driver);
+ if (ret)
+ uart_unregister_driver(&sa1100_reg);
+ }
+ return ret;
+}
+
+static void __exit sa1100_serial_exit(void)
+{
+ platform_driver_unregister(&sa11x0_serial_driver);
+ uart_unregister_driver(&sa1100_reg);
+}
+
+module_init(sa1100_serial_init);
+module_exit(sa1100_serial_exit);
+
+MODULE_AUTHOR("Deep Blue Solutions Ltd");
+MODULE_DESCRIPTION("SA1100 generic serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
+MODULE_ALIAS("platform:sa11x0-uart");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 03:51:32 +0000