--- /dev/null
+/*
+ * m32r_sio.c
+ *
+ * Driver for M32R serial ports
+ *
+ * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ * Based on drivers/serial/8250.c.
+ *
+ * Copyright (C) 2001 Russell King.
+ * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
+ *
+ * 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.
+ */
+
+/*
+ * A note about mapbase / membase
+ *
+ * mapbase is the physical address of the IO port. Currently, we don't
+ * support this very well, and it may well be dropped from this driver
+ * in future. As such, mapbase should be NULL.
+ *
+ * membase is an 'ioremapped' cookie. This is compatible with the old
+ * serial.c driver, and is currently the preferred form.
+ */
+
+#if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/serial.h>
+#include <linux/delay.h>
+
+#include <asm/m32r.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#define BAUD_RATE 115200
+
+#include <linux/serial_core.h>
+#include "m32r_sio.h"
+#include "m32r_sio_reg.h"
+
+/*
+ * Debugging.
+ */
+#if 0
+#define DEBUG_AUTOCONF(fmt...) printk(fmt)
+#else
+#define DEBUG_AUTOCONF(fmt...) do { } while (0)
+#endif
+
+#if 0
+#define DEBUG_INTR(fmt...) printk(fmt)
+#else
+#define DEBUG_INTR(fmt...) do { } while (0)
+#endif
+
+#define PASS_LIMIT 256
+
+#define BASE_BAUD 115200
+
+/* Standard COM flags */
+#define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
+
+/*
+ * SERIAL_PORT_DFNS tells us about built-in ports that have no
+ * standard enumeration mechanism. Platforms that can find all
+ * serial ports via mechanisms like ACPI or PCI need not supply it.
+ */
+#if defined(CONFIG_PLAT_USRV)
+
+#define SERIAL_PORT_DFNS \
+ /* UART CLK PORT IRQ FLAGS */ \
+ { 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \
+ { 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */
+
+#else /* !CONFIG_PLAT_USRV */
+
+#if defined(CONFIG_SERIAL_M32R_PLDSIO)
+#define SERIAL_PORT_DFNS \
+ { 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \
+ STD_COM_FLAGS }, /* ttyS0 */
+#else
+#define SERIAL_PORT_DFNS \
+ { 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R, \
+ STD_COM_FLAGS }, /* ttyS0 */
+#endif
+
+#endif /* !CONFIG_PLAT_USRV */
+
+static struct old_serial_port old_serial_port[] = {
+ SERIAL_PORT_DFNS
+};
+
+#define UART_NR ARRAY_SIZE(old_serial_port)
+
+struct uart_sio_port {
+ struct uart_port port;
+ struct timer_list timer; /* "no irq" timer */
+ struct list_head list; /* ports on this IRQ */
+ unsigned short rev;
+ unsigned char acr;
+ unsigned char ier;
+ unsigned char lcr;
+ unsigned char mcr_mask; /* mask of user bits */
+ unsigned char mcr_force; /* mask of forced bits */
+ unsigned char lsr_break_flag;
+
+ /*
+ * We provide a per-port pm hook.
+ */
+ void (*pm)(struct uart_port *port,
+ unsigned int state, unsigned int old);
+};
+
+struct irq_info {
+ spinlock_t lock;
+ struct list_head *head;
+};
+
+static struct irq_info irq_lists[NR_IRQS];
+
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+
+#define __sio_in(x) inw((unsigned long)(x))
+#define __sio_out(v,x) outw((v),(unsigned long)(x))
+
+static inline void sio_set_baud_rate(unsigned long baud)
+{
+ unsigned short sbaud;
+ sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
+ __sio_out(sbaud, PLD_ESIO0BAUR);
+}
+
+static void sio_reset(void)
+{
+ unsigned short tmp;
+
+ tmp = __sio_in(PLD_ESIO0RXB);
+ tmp = __sio_in(PLD_ESIO0RXB);
+ tmp = __sio_in(PLD_ESIO0CR);
+ sio_set_baud_rate(BAUD_RATE);
+ __sio_out(0x0300, PLD_ESIO0CR);
+ __sio_out(0x0003, PLD_ESIO0CR);
+}
+
+static void sio_init(void)
+{
+ unsigned short tmp;
+
+ tmp = __sio_in(PLD_ESIO0RXB);
+ tmp = __sio_in(PLD_ESIO0RXB);
+ tmp = __sio_in(PLD_ESIO0CR);
+ __sio_out(0x0300, PLD_ESIO0CR);
+ __sio_out(0x0003, PLD_ESIO0CR);
+}
+
+static void sio_error(int *status)
+{
+ printk("SIO0 error[%04x]\n", *status);
+ do {
+ sio_init();
+ } while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
+}
+
+#else /* not CONFIG_SERIAL_M32R_PLDSIO */
+
+#define __sio_in(x) inl(x)
+#define __sio_out(v,x) outl((v),(x))
+
+static inline void sio_set_baud_rate(unsigned long baud)
+{
+ unsigned long i, j;
+
+ i = boot_cpu_data.bus_clock / (baud * 16);
+ j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
+ i -= 1;
+ j = (j + 1) >> 1;
+
+ __sio_out(i, M32R_SIO0_BAUR_PORTL);
+ __sio_out(j, M32R_SIO0_RBAUR_PORTL);
+}
+
+static void sio_reset(void)
+{
+ __sio_out(0x00000300, M32R_SIO0_CR_PORTL); /* init status */
+ __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL); /* 8bit */
+ __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL); /* 1stop non */
+ sio_set_baud_rate(BAUD_RATE);
+ __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
+ __sio_out(0x00000003, M32R_SIO0_CR_PORTL); /* RXCEN */
+}
+
+static void sio_init(void)
+{
+ unsigned int tmp;
+
+ tmp = __sio_in(M32R_SIO0_RXB_PORTL);
+ tmp = __sio_in(M32R_SIO0_RXB_PORTL);
+ tmp = __sio_in(M32R_SIO0_STS_PORTL);
+ __sio_out(0x00000003, M32R_SIO0_CR_PORTL);
+}
+
+static void sio_error(int *status)
+{
+ printk("SIO0 error[%04x]\n", *status);
+ do {
+ sio_init();
+ } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
+}
+
+#endif /* CONFIG_SERIAL_M32R_PLDSIO */
+
+static unsigned int sio_in(struct uart_sio_port *up, int offset)
+{
+ return __sio_in(up->port.iobase + offset);
+}
+
+static void sio_out(struct uart_sio_port *up, int offset, int value)
+{
+ __sio_out(value, up->port.iobase + offset);
+}
+
+static unsigned int serial_in(struct uart_sio_port *up, int offset)
+{
+ if (!offset)
+ return 0;
+
+ return __sio_in(offset);
+}
+
+static void serial_out(struct uart_sio_port *up, int offset, int value)
+{
+ if (!offset)
+ return;
+
+ __sio_out(value, offset);
+}
+
+static void m32r_sio_stop_tx(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ if (up->ier & UART_IER_THRI) {
+ up->ier &= ~UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ }
+}
+
+static void m32r_sio_start_tx(struct uart_port *port)
+{
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ struct circ_buf *xmit = &up->port.state->xmit;
+
+ if (!(up->ier & UART_IER_THRI)) {
+ up->ier |= UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ if (!uart_circ_empty(xmit)) {
+ serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ up->port.icount.tx++;
+ }
+ }
+ while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
+#else
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ if (!(up->ier & UART_IER_THRI)) {
+ up->ier |= UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ }
+#endif
+}
+
+static void m32r_sio_stop_rx(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ up->ier &= ~UART_IER_RLSI;
+ up->port.read_status_mask &= ~UART_LSR_DR;
+ serial_out(up, UART_IER, up->ier);
+}
+
+static void m32r_sio_enable_ms(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ up->ier |= UART_IER_MSI;
+ serial_out(up, UART_IER, up->ier);
+}
+
+static void receive_chars(struct uart_sio_port *up, int *status)
+{
+ struct tty_port *port = &up->port.state->port;
+ unsigned char ch;
+ unsigned char flag;
+ int max_count = 256;
+
+ do {
+ ch = sio_in(up, SIORXB);
+ flag = TTY_NORMAL;
+ up->port.icount.rx++;
+
+ if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+ UART_LSR_FE | UART_LSR_OE))) {
+ /*
+ * For statistics only
+ */
+ if (*status & UART_LSR_BI) {
+ *status &= ~(UART_LSR_FE | UART_LSR_PE);
+ up->port.icount.brk++;
+ /*
+ * We do the SysRQ and SAK checking
+ * here because otherwise the break
+ * may get masked by ignore_status_mask
+ * or read_status_mask.
+ */
+ if (uart_handle_break(&up->port))
+ goto ignore_char;
+ } else if (*status & UART_LSR_PE)
+ up->port.icount.parity++;
+ else if (*status & UART_LSR_FE)
+ up->port.icount.frame++;
+ if (*status & UART_LSR_OE)
+ up->port.icount.overrun++;
+
+ /*
+ * Mask off conditions which should be ingored.
+ */
+ *status &= up->port.read_status_mask;
+
+ if (up->port.line == up->port.cons->index) {
+ /* Recover the break flag from console xmit */
+ *status |= up->lsr_break_flag;
+ up->lsr_break_flag = 0;
+ }
+
+ if (*status & UART_LSR_BI) {
+ DEBUG_INTR("handling break....");
+ flag = TTY_BREAK;
+ } else if (*status & UART_LSR_PE)
+ flag = TTY_PARITY;
+ else if (*status & UART_LSR_FE)
+ flag = TTY_FRAME;
+ }
+ if (uart_handle_sysrq_char(&up->port, ch))
+ goto ignore_char;
+ if ((*status & up->port.ignore_status_mask) == 0)
+ tty_insert_flip_char(port, ch, flag);
+
+ if (*status & UART_LSR_OE) {
+ /*
+ * Overrun is special, since it's reported
+ * immediately, and doesn't affect the current
+ * character.
+ */
+ tty_insert_flip_char(port, 0, TTY_OVERRUN);
+ }
+ ignore_char:
+ *status = serial_in(up, UART_LSR);
+ } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+
+ spin_unlock(&up->port.lock);
+ tty_flip_buffer_push(port);
+ spin_lock(&up->port.lock);
+}
+
+static void transmit_chars(struct uart_sio_port *up)
+{
+ struct circ_buf *xmit = &up->port.state->xmit;
+ int count;
+
+ if (up->port.x_char) {
+#ifndef CONFIG_SERIAL_M32R_PLDSIO /* XXX */
+ serial_out(up, UART_TX, up->port.x_char);
+#endif
+ up->port.icount.tx++;
+ up->port.x_char = 0;
+ return;
+ }
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+ m32r_sio_stop_tx(&up->port);
+ return;
+ }
+
+ count = up->port.fifosize;
+ do {
+ serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ up->port.icount.tx++;
+ if (uart_circ_empty(xmit))
+ break;
+ while (!(serial_in(up, UART_LSR) & UART_LSR_THRE));
+
+ } while (--count > 0);
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&up->port);
+
+ DEBUG_INTR("THRE...");
+
+ if (uart_circ_empty(xmit))
+ m32r_sio_stop_tx(&up->port);
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static inline void m32r_sio_handle_port(struct uart_sio_port *up,
+ unsigned int status)
+{
+ DEBUG_INTR("status = %x...", status);
+
+ if (status & 0x04)
+ receive_chars(up, &status);
+ if (status & 0x01)
+ transmit_chars(up);
+}
+
+/*
+ * This is the serial driver's interrupt routine.
+ *
+ * Arjan thinks the old way was overly complex, so it got simplified.
+ * Alan disagrees, saying that need the complexity to handle the weird
+ * nature of ISA shared interrupts. (This is a special exception.)
+ *
+ * In order to handle ISA shared interrupts properly, we need to check
+ * that all ports have been serviced, and therefore the ISA interrupt
+ * line has been de-asserted.
+ *
+ * This means we need to loop through all ports. checking that they
+ * don't have an interrupt pending.
+ */
+static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
+{
+ struct irq_info *i = dev_id;
+ struct list_head *l, *end = NULL;
+ int pass_counter = 0;
+
+ DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
+
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+// if (irq == PLD_IRQ_SIO0_SND)
+// irq = PLD_IRQ_SIO0_RCV;
+#else
+ if (irq == M32R_IRQ_SIO0_S)
+ irq = M32R_IRQ_SIO0_R;
+#endif
+
+ spin_lock(&i->lock);
+
+ l = i->head;
+ do {
+ struct uart_sio_port *up;
+ unsigned int sts;
+
+ up = list_entry(l, struct uart_sio_port, list);
+
+ sts = sio_in(up, SIOSTS);
+ if (sts & 0x5) {
+ spin_lock(&up->port.lock);
+ m32r_sio_handle_port(up, sts);
+ spin_unlock(&up->port.lock);
+
+ end = NULL;
+ } else if (end == NULL)
+ end = l;
+
+ l = l->next;
+
+ if (l == i->head && pass_counter++ > PASS_LIMIT) {
+ if (sts & 0xe0)
+ sio_error(&sts);
+ break;
+ }
+ } while (l != end);
+
+ spin_unlock(&i->lock);
+
+ DEBUG_INTR("end.\n");
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * To support ISA shared interrupts, we need to have one interrupt
+ * handler that ensures that the IRQ line has been deasserted
+ * before returning. Failing to do this will result in the IRQ
+ * line being stuck active, and, since ISA irqs are edge triggered,
+ * no more IRQs will be seen.
+ */
+static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
+{
+ spin_lock_irq(&i->lock);
+
+ if (!list_empty(i->head)) {
+ if (i->head == &up->list)
+ i->head = i->head->next;
+ list_del(&up->list);
+ } else {
+ BUG_ON(i->head != &up->list);
+ i->head = NULL;
+ }
+
+ spin_unlock_irq(&i->lock);
+}
+
+static int serial_link_irq_chain(struct uart_sio_port *up)
+{
+ struct irq_info *i = irq_lists + up->port.irq;
+ int ret, irq_flags = 0;
+
+ spin_lock_irq(&i->lock);
+
+ if (i->head) {
+ list_add(&up->list, i->head);
+ spin_unlock_irq(&i->lock);
+
+ ret = 0;
+ } else {
+ INIT_LIST_HEAD(&up->list);
+ i->head = &up->list;
+ spin_unlock_irq(&i->lock);
+
+ ret = request_irq(up->port.irq, m32r_sio_interrupt,
+ irq_flags, "SIO0-RX", i);
+ ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
+ irq_flags, "SIO0-TX", i);
+ if (ret < 0)
+ serial_do_unlink(i, up);
+ }
+
+ return ret;
+}
+
+static void serial_unlink_irq_chain(struct uart_sio_port *up)
+{
+ struct irq_info *i = irq_lists + up->port.irq;
+
+ BUG_ON(i->head == NULL);
+
+ if (list_empty(i->head)) {
+ free_irq(up->port.irq, i);
+ free_irq(up->port.irq + 1, i);
+ }
+
+ serial_do_unlink(i, up);
+}
+
+/*
+ * This function is used to handle ports that do not have an interrupt.
+ */
+static void m32r_sio_timeout(unsigned long data)
+{
+ struct uart_sio_port *up = (struct uart_sio_port *)data;
+ unsigned int timeout;
+ unsigned int sts;
+
+ sts = sio_in(up, SIOSTS);
+ if (sts & 0x5) {
+ spin_lock(&up->port.lock);
+ m32r_sio_handle_port(up, sts);
+ spin_unlock(&up->port.lock);
+ }
+
+ timeout = up->port.timeout;
+ timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
+ mod_timer(&up->timer, jiffies + timeout);
+}
+
+static unsigned int m32r_sio_tx_empty(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ unsigned long flags;
+ unsigned int ret;
+
+ spin_lock_irqsave(&up->port.lock, flags);
+ ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+ spin_unlock_irqrestore(&up->port.lock, flags);
+
+ return ret;
+}
+
+static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
+{
+ return 0;
+}
+
+static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+
+}
+
+static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
+{
+
+}
+
+static int m32r_sio_startup(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ int retval;
+
+ sio_init();
+
+ /*
+ * If the "interrupt" for this port doesn't correspond with any
+ * hardware interrupt, we use a timer-based system. The original
+ * driver used to do this with IRQ0.
+ */
+ if (!up->port.irq) {
+ unsigned int timeout = up->port.timeout;
+
+ timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
+
+ up->timer.data = (unsigned long)up;
+ mod_timer(&up->timer, jiffies + timeout);
+ } else {
+ retval = serial_link_irq_chain(up);
+ if (retval)
+ return retval;
+ }
+
+ /*
+ * Finally, enable interrupts. Note: Modem status interrupts
+ * are set via set_termios(), which will be occurring imminently
+ * anyway, so we don't enable them here.
+ * - M32R_SIO: 0x0c
+ * - M32R_PLDSIO: 0x04
+ */
+ up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
+ sio_out(up, SIOTRCR, up->ier);
+
+ /*
+ * And clear the interrupt registers again for luck.
+ */
+ sio_reset();
+
+ return 0;
+}
+
+static void m32r_sio_shutdown(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ /*
+ * Disable interrupts from this port
+ */
+ up->ier = 0;
+ sio_out(up, SIOTRCR, 0);
+
+ /*
+ * Disable break condition and FIFOs
+ */
+
+ sio_init();
+
+ if (!up->port.irq)
+ del_timer_sync(&up->timer);
+ else
+ serial_unlink_irq_chain(up);
+}
+
+static unsigned int m32r_sio_get_divisor(struct uart_port *port,
+ unsigned int baud)
+{
+ return uart_get_divisor(port, baud);
+}
+
+static void m32r_sio_set_termios(struct uart_port *port,
+ struct ktermios *termios, struct ktermios *old)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ unsigned char cval = 0;
+ unsigned long flags;
+ unsigned int baud, quot;
+
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ cval = UART_LCR_WLEN5;
+ break;
+ case CS6:
+ cval = UART_LCR_WLEN6;
+ break;
+ case CS7:
+ cval = UART_LCR_WLEN7;
+ break;
+ default:
+ case CS8:
+ cval = UART_LCR_WLEN8;
+ break;
+ }
+
+ if (termios->c_cflag & CSTOPB)
+ cval |= UART_LCR_STOP;
+ if (termios->c_cflag & PARENB)
+ cval |= UART_LCR_PARITY;
+ if (!(termios->c_cflag & PARODD))
+ cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+ if (termios->c_cflag & CMSPAR)
+ cval |= UART_LCR_SPAR;
+#endif
+
+ /*
+ * Ask the core to calculate the divisor for us.
+ */
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
+#else
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+#endif
+ quot = m32r_sio_get_divisor(port, baud);
+
+ /*
+ * Ok, we're now changing the port state. Do it with
+ * interrupts disabled.
+ */
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ sio_set_baud_rate(baud);
+
+ /*
+ * Update the per-port timeout.
+ */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+ if (termios->c_iflag & INPCK)
+ up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+ if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
+ up->port.read_status_mask |= UART_LSR_BI;
+
+ /*
+ * Characteres to ignore
+ */
+ up->port.ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+ if (termios->c_iflag & IGNBRK) {
+ up->port.ignore_status_mask |= UART_LSR_BI;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ up->port.ignore_status_mask |= UART_LSR_OE;
+ }
+
+ /*
+ * ignore all characters if CREAD is not set
+ */
+ if ((termios->c_cflag & CREAD) == 0)
+ up->port.ignore_status_mask |= UART_LSR_DR;
+
+ /*
+ * CTS flow control flag and modem status interrupts
+ */
+ up->ier &= ~UART_IER_MSI;
+ if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+ up->ier |= UART_IER_MSI;
+
+ serial_out(up, UART_IER, up->ier);
+
+ up->lcr = cval; /* Save LCR */
+ spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void m32r_sio_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ if (up->pm)
+ up->pm(port, state, oldstate);
+}
+
+/*
+ * Resource handling. This is complicated by the fact that resources
+ * depend on the port type. Maybe we should be claiming the standard
+ * 8250 ports, and then trying to get other resources as necessary?
+ */
+static int
+m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
+{
+ unsigned int size = 8 << up->port.regshift;
+#ifndef CONFIG_SERIAL_M32R_PLDSIO
+ unsigned long start;
+#endif
+ int ret = 0;
+
+ switch (up->port.iotype) {
+ case UPIO_MEM:
+ if (up->port.mapbase) {
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+ *res = request_mem_region(up->port.mapbase, size, "serial");
+#else
+ start = up->port.mapbase;
+ *res = request_mem_region(start, size, "serial");
+#endif
+ if (!*res)
+ ret = -EBUSY;
+ }
+ break;
+
+ case UPIO_PORT:
+ *res = request_region(up->port.iobase, size, "serial");
+ if (!*res)
+ ret = -EBUSY;
+ break;
+ }
+ return ret;
+}
+
+static void m32r_sio_release_port(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ unsigned long start, offset = 0, size = 0;
+
+ size <<= up->port.regshift;
+
+ switch (up->port.iotype) {
+ case UPIO_MEM:
+ if (up->port.mapbase) {
+ /*
+ * Unmap the area.
+ */
+ iounmap(up->port.membase);
+ up->port.membase = NULL;
+
+ start = up->port.mapbase;
+
+ if (size)
+ release_mem_region(start + offset, size);
+ release_mem_region(start, 8 << up->port.regshift);
+ }
+ break;
+
+ case UPIO_PORT:
+ start = up->port.iobase;
+
+ if (size)
+ release_region(start + offset, size);
+ release_region(start + offset, 8 << up->port.regshift);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static int m32r_sio_request_port(struct uart_port *port)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ struct resource *res = NULL;
+ int ret = 0;
+
+ ret = m32r_sio_request_std_resource(up, &res);
+
+ /*
+ * If we have a mapbase, then request that as well.
+ */
+ if (ret == 0 && up->port.flags & UPF_IOREMAP) {
+ int size = resource_size(res);
+
+ up->port.membase = ioremap(up->port.mapbase, size);
+ if (!up->port.membase)
+ ret = -ENOMEM;
+ }
+
+ if (ret < 0) {
+ if (res)
+ release_resource(res);
+ }
+
+ return ret;
+}
+
+static void m32r_sio_config_port(struct uart_port *port, int unused)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+ unsigned long flags;
+
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ up->port.fifosize = 1;
+
+ spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int
+m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ if (ser->irq >= nr_irqs || ser->irq < 0 || ser->baud_base < 9600)
+ return -EINVAL;
+ return 0;
+}
+
+static struct uart_ops m32r_sio_pops = {
+ .tx_empty = m32r_sio_tx_empty,
+ .set_mctrl = m32r_sio_set_mctrl,
+ .get_mctrl = m32r_sio_get_mctrl,
+ .stop_tx = m32r_sio_stop_tx,
+ .start_tx = m32r_sio_start_tx,
+ .stop_rx = m32r_sio_stop_rx,
+ .enable_ms = m32r_sio_enable_ms,
+ .break_ctl = m32r_sio_break_ctl,
+ .startup = m32r_sio_startup,
+ .shutdown = m32r_sio_shutdown,
+ .set_termios = m32r_sio_set_termios,
+ .pm = m32r_sio_pm,
+ .release_port = m32r_sio_release_port,
+ .request_port = m32r_sio_request_port,
+ .config_port = m32r_sio_config_port,
+ .verify_port = m32r_sio_verify_port,
+};
+
+static struct uart_sio_port m32r_sio_ports[UART_NR];
+
+static void __init m32r_sio_init_ports(void)
+{
+ struct uart_sio_port *up;
+ static int first = 1;
+ int i;
+
+ if (!first)
+ return;
+ first = 0;
+
+ for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
+ i++, up++) {
+ up->port.iobase = old_serial_port[i].port;
+ up->port.irq = irq_canonicalize(old_serial_port[i].irq);
+ up->port.uartclk = old_serial_port[i].baud_base * 16;
+ up->port.flags = old_serial_port[i].flags;
+ up->port.membase = old_serial_port[i].iomem_base;
+ up->port.iotype = old_serial_port[i].io_type;
+ up->port.regshift = old_serial_port[i].iomem_reg_shift;
+ up->port.ops = &m32r_sio_pops;
+ }
+}
+
+static void __init m32r_sio_register_ports(struct uart_driver *drv)
+{
+ int i;
+
+ m32r_sio_init_ports();
+
+ for (i = 0; i < UART_NR; i++) {
+ struct uart_sio_port *up = &m32r_sio_ports[i];
+
+ up->port.line = i;
+ up->port.ops = &m32r_sio_pops;
+ init_timer(&up->timer);
+ up->timer.function = m32r_sio_timeout;
+
+ up->mcr_mask = ~0;
+ up->mcr_force = 0;
+
+ uart_add_one_port(drv, &up->port);
+ }
+}
+
+#ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
+
+/*
+ * Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct uart_sio_port *up)
+{
+ unsigned int status, tmout = 10000;
+
+ /* Wait up to 10ms for the character(s) to be sent. */
+ do {
+ status = sio_in(up, SIOSTS);
+
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ } while ((status & UART_EMPTY) != UART_EMPTY);
+
+ /* Wait up to 1s for flow control if necessary */
+ if (up->port.flags & UPF_CONS_FLOW) {
+ tmout = 1000000;
+ while (--tmout)
+ udelay(1);
+ }
+}
+
+static void m32r_sio_console_putchar(struct uart_port *port, int ch)
+{
+ struct uart_sio_port *up =
+ container_of(port, struct uart_sio_port, port);
+
+ wait_for_xmitr(up);
+ sio_out(up, SIOTXB, ch);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ * The console_lock must be held when we get here.
+ */
+static void m32r_sio_console_write(struct console *co, const char *s,
+ unsigned int count)
+{
+ struct uart_sio_port *up = &m32r_sio_ports[co->index];
+ unsigned int ier;
+
+ /*
+ * First save the UER then disable the interrupts
+ */
+ ier = sio_in(up, SIOTRCR);
+ sio_out(up, SIOTRCR, 0);
+
+ uart_console_write(&up->port, s, count, m32r_sio_console_putchar);
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore the IER
+ */
+ wait_for_xmitr(up);
+ sio_out(up, SIOTRCR, ier);
+}
+
+static int __init m32r_sio_console_setup(struct console *co, char *options)
+{
+ struct uart_port *port;
+ 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 >= UART_NR)
+ co->index = 0;
+ port = &m32r_sio_ports[co->index].port;
+
+ /*
+ * Temporary fix.
+ */
+ spin_lock_init(&port->lock);
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver m32r_sio_reg;
+static struct console m32r_sio_console = {
+ .name = "ttyS",
+ .write = m32r_sio_console_write,
+ .device = uart_console_device,
+ .setup = m32r_sio_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &m32r_sio_reg,
+};
+
+static int __init m32r_sio_console_init(void)
+{
+ sio_reset();
+ sio_init();
+ m32r_sio_init_ports();
+ register_console(&m32r_sio_console);
+ return 0;
+}
+console_initcall(m32r_sio_console_init);
+
+#define M32R_SIO_CONSOLE &m32r_sio_console
+#else
+#define M32R_SIO_CONSOLE NULL
+#endif
+
+static struct uart_driver m32r_sio_reg = {
+ .owner = THIS_MODULE,
+ .driver_name = "sio",
+ .dev_name = "ttyS",
+ .major = TTY_MAJOR,
+ .minor = 64,
+ .nr = UART_NR,
+ .cons = M32R_SIO_CONSOLE,
+};
+
+/**
+ * m32r_sio_suspend_port - suspend one serial port
+ * @line: serial line number
+ *
+ * Suspend one serial port.
+ */
+void m32r_sio_suspend_port(int line)
+{
+ uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
+}
+
+/**
+ * m32r_sio_resume_port - resume one serial port
+ * @line: serial line number
+ *
+ * Resume one serial port.
+ */
+void m32r_sio_resume_port(int line)
+{
+ uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
+}
+
+static int __init m32r_sio_init(void)
+{
+ int ret, i;
+
+ printk(KERN_INFO "Serial: M32R SIO driver\n");
+
+ for (i = 0; i < nr_irqs; i++)
+ spin_lock_init(&irq_lists[i].lock);
+
+ ret = uart_register_driver(&m32r_sio_reg);
+ if (ret >= 0)
+ m32r_sio_register_ports(&m32r_sio_reg);
+
+ return ret;
+}
+
+static void __exit m32r_sio_exit(void)
+{
+ int i;
+
+ for (i = 0; i < UART_NR; i++)
+ uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
+
+ uart_unregister_driver(&m32r_sio_reg);
+}
+
+module_init(m32r_sio_init);
+module_exit(m32r_sio_exit);
+
+EXPORT_SYMBOL(m32r_sio_suspend_port);
+EXPORT_SYMBOL(m32r_sio_resume_port);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic M32R SIO serial driver");
Code Review / kvmfornfv.git / blobdiff