[ifxmips] adss 2.6.33 kernel patches, not defult yet as linux-atm breaks on 2.6.33

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20789 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 551 insertions, 0 deletions

diff --git a/target/linux/ifxmips/files-2.6.33/drivers/serial/ifxmips.c b/target/linux/ifxmips/files-2.6.33/drivers/serial/ifxmips.c
new file mode 100644
index 0000000000..4d35dc7fc7
--- /dev/null
+++ b/target/linux/ifxmips/files-2.6.33/drivers/serial/ifxmips.c
@@ -0,0 +1,551 @@
+/*
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * 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
+ *
+ * Copyright (C) 2004 Infineon IFAP DC COM CPE
+ * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+
+#include <ifxmips.h>
+#include <ifxmips_irq.h>
+
+#define PORT_IFXMIPSASC  111
+
+#include <linux/serial_core.h>
+
+#define UART_DUMMY_UER_RX 1
+
+static void ifxmipsasc_tx_chars(struct uart_port *port);
+extern void prom_printf(const char *fmt, ...);
+static struct uart_port ifxmipsasc_port[2];
+static struct uart_driver ifxmipsasc_reg;
+extern unsigned int ifxmips_get_fpi_hz(void);
+
+static void ifxmipsasc_stop_tx(struct uart_port *port)
+{
+	return;
+}
+
+static void ifxmipsasc_start_tx(struct uart_port *port)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	ifxmipsasc_tx_chars(port);
+	local_irq_restore(flags);
+	return;
+}
+
+static void ifxmipsasc_stop_rx(struct uart_port *port)
+{
+	ifxmips_w32(ASCWHBSTATE_CLRREN, port->membase + IFXMIPS_ASC_WHBSTATE);
+}
+
+static void ifxmipsasc_enable_ms(struct uart_port *port)
+{
+}
+
+#include <linux/version.h>
+
+static void ifxmipsasc_rx_chars(struct uart_port *port)
+{
+	struct tty_struct *tty = port->state->port.tty;
+	unsigned int ch = 0, rsr = 0, fifocnt;
+
+	fifocnt = ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
+	while (fifocnt--) {
+		u8 flag = TTY_NORMAL;
+		ch = ifxmips_r32(port->membase + IFXMIPS_ASC_RBUF);
+		rsr = (ifxmips_r32(port->membase + IFXMIPS_ASC_STATE) & ASCSTATE_ANY) | UART_DUMMY_UER_RX;
+		tty_flip_buffer_push(tty);
+		port->icount.rx++;
+
+		/*
+		 * Note that the error handling code is
+		 * out of the main execution path
+		 */
+		if (rsr & ASCSTATE_ANY) {
+			if (rsr & ASCSTATE_PE) {
+				port->icount.parity++;
+				ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRPE, port->membase + IFXMIPS_ASC_WHBSTATE);
+			} else if (rsr & ASCSTATE_FE) {
+				port->icount.frame++;
+				ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRFE, port->membase + IFXMIPS_ASC_WHBSTATE);
+			}
+			if (rsr & ASCSTATE_ROE) {
+				port->icount.overrun++;
+				ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRROE, port->membase + IFXMIPS_ASC_WHBSTATE);
+			}
+
+			rsr &= port->read_status_mask;
+
+			if (rsr & ASCSTATE_PE)
+				flag = TTY_PARITY;
+			else if (rsr & ASCSTATE_FE)
+				flag = TTY_FRAME;
+		}
+
+		if ((rsr & port->ignore_status_mask) == 0)
+			tty_insert_flip_char(tty, ch, flag);
+
+		if (rsr & ASCSTATE_ROE)
+			/*
+			 * Overrun is special, since it's reported
+			 * immediately, and doesn't affect the current
+			 * character
+			 */
+			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+	}
+	if (ch != 0)
+		tty_flip_buffer_push(tty);
+	return;
+}
+
+
+static void ifxmipsasc_tx_chars(struct uart_port *port)
+{
+	struct circ_buf *xmit = &port->state->xmit;
+	if (uart_tx_stopped(port)) {
+		ifxmipsasc_stop_tx(port);
+		return;
+	}
+
+	while (((ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK)
+			>> ASCFSTAT_TXFFLOFF) != TXFIFO_FULL) {
+		if (port->x_char) {
+			ifxmips_w32(port->x_char, port->membase + IFXMIPS_ASC_TBUF);
+			port->icount.tx++;
+			port->x_char = 0;
+			continue;
+		}
+
+		if (uart_circ_empty(xmit))
+			break;
+
+		ifxmips_w32(port->state->xmit.buf[port->state->xmit.tail], port->membase + IFXMIPS_ASC_TBUF);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		port->icount.tx++;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+}
+
+static irqreturn_t ifxmipsasc_tx_int(int irq, void *_port)
+{
+	struct uart_port *port = (struct uart_port *)_port;
+	ifxmips_w32(ASC_IRNCR_TIR, port->membase + IFXMIPS_ASC_IRNCR);
+	ifxmipsasc_start_tx(port);
+	ifxmips_mask_and_ack_irq(irq);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ifxmipsasc_er_int(int irq, void *_port)
+{
+	struct uart_port *port = (struct uart_port *)_port;
+	/* clear any pending interrupts */
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_WHBSTATE) | ASCWHBSTATE_CLRPE |
+			ASCWHBSTATE_CLRFE | ASCWHBSTATE_CLRROE, port->membase + IFXMIPS_ASC_WHBSTATE);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ifxmipsasc_rx_int(int irq, void *_port)
+{
+	struct uart_port *port = (struct uart_port *)_port;
+	ifxmips_w32(ASC_IRNCR_RIR, port->membase + IFXMIPS_ASC_IRNCR);
+	ifxmipsasc_rx_chars((struct uart_port *)port);
+	ifxmips_mask_and_ack_irq(irq);
+	return IRQ_HANDLED;
+}
+
+static unsigned int ifxmipsasc_tx_empty(struct uart_port *port)
+{
+	int status;
+	status = ifxmips_r32(port->membase + IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
+	return status ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int ifxmipsasc_get_mctrl(struct uart_port *port)
+{
+	return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
+}
+
+static void ifxmipsasc_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+}
+
+static void ifxmipsasc_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static int ifxmipsasc_startup(struct uart_port *port)
+{
+	int retval;
+
+	port->uartclk = ifxmips_get_fpi_hz();
+
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CLC) & ~IFXMIPS_ASC_CLC_DISS, port->membase + IFXMIPS_ASC_CLC);
+	ifxmips_w32(((ifxmips_r32(port->membase + IFXMIPS_ASC_CLC) & ~ASCCLC_RMCMASK)) | (1 << ASCCLC_RMCOFFSET), port->membase + IFXMIPS_ASC_CLC);
+	ifxmips_w32(0, port->membase + IFXMIPS_ASC_PISEL);
+	ifxmips_w32(((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) | ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU, port->membase + IFXMIPS_ASC_TXFCON);
+	ifxmips_w32(((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK) | ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU, port->membase + IFXMIPS_ASC_RXFCON);
+	wmb();
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN, port->membase + IFXMIPS_ASC_CON);
+
+	retval = request_irq(port->irq, ifxmipsasc_tx_int, IRQF_DISABLED, "asc_tx", port);
+	if (retval) {
+		printk(KERN_ERR "failed to request ifxmipsasc_tx_int\n");
+		return retval;
+	}
+
+	retval = request_irq(port->irq + 2, ifxmipsasc_rx_int, IRQF_DISABLED, "asc_rx", port);
+	if (retval) {
+		printk(KERN_ERR "failed to request ifxmipsasc_rx_int\n");
+		goto err1;
+	}
+
+	retval = request_irq(port->irq + 3, ifxmipsasc_er_int, IRQF_DISABLED, "asc_er", port);
+	if (retval) {
+		printk(KERN_ERR "failed to request ifxmipsasc_er_int\n");
+		goto err2;
+	}
+
+	ifxmips_w32(ASC_IRNREN_RX_BUF | ASC_IRNREN_TX_BUF | ASC_IRNREN_ERR | ASC_IRNREN_TX, port->membase + IFXMIPS_ASC_IRNREN);
+	return 0;
+
+err2:
+	free_irq(port->irq + 2, port);
+err1:
+	free_irq(port->irq, port);
+	return retval;
+}
+
+static void ifxmipsasc_shutdown(struct uart_port *port)
+{
+	free_irq(port->irq, port);
+	free_irq(port->irq + 2, port);
+	free_irq(port->irq + 3, port);
+
+	ifxmips_w32(0, port->membase + IFXMIPS_ASC_CON);
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_RXFCON) | ASCRXFCON_RXFFLU, port->membase + IFXMIPS_ASC_RXFCON);
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_RXFCON) & ~ASCRXFCON_RXFEN, port->membase + IFXMIPS_ASC_RXFCON);
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_TXFCON) | ASCTXFCON_TXFFLU, port->membase + IFXMIPS_ASC_TXFCON);
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_TXFCON) & ~ASCTXFCON_TXFEN, port->membase + IFXMIPS_ASC_TXFCON);
+}
+
+static void ifxmipsasc_set_termios(struct uart_port *port, struct ktermios *new, struct ktermios *old)
+{
+	unsigned int cflag;
+	unsigned int iflag;
+	unsigned int quot;
+	unsigned int baud;
+	unsigned int con = 0;
+	unsigned long flags;
+
+	cflag = new->c_cflag;
+	iflag = new->c_iflag;
+
+	switch (cflag & CSIZE) {
+	case CS7:
+		con = ASCCON_M_7ASYNC;
+		break;
+
+	case CS5:
+	case CS6:
+	default:
+		con = ASCCON_M_8ASYNC;
+		break;
+	}
+
+	if (cflag & CSTOPB)
+		con |= ASCCON_STP;
+
+	if (cflag & PARENB) {
+		if (!(cflag & PARODD))
+			con &= ~ASCCON_ODD;
+		else
+			con |= ASCCON_ODD;
+	}
+
+	port->read_status_mask = ASCSTATE_ROE;
+	if (iflag & INPCK)
+		port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
+
+	port->ignore_status_mask = 0;
+	if (iflag & IGNPAR)
+		port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
+
+	if (iflag & IGNBRK) {
+		/*
+		 * If we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (iflag & IGNPAR)
+			port->ignore_status_mask |= ASCSTATE_ROE;
+	}
+
+	if ((cflag & CREAD) == 0)
+		port->ignore_status_mask |= UART_DUMMY_UER_RX;
+
+	/* set error signals  - framing, parity  and overrun, enable receiver */
+	con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
+
+	local_irq_save(flags);
+
+	/* set up CON */
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | con, port->membase + IFXMIPS_ASC_CON);
+
+	/* Set baud rate - take a divider of 2 into account */
+	baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
+	quot = uart_get_divisor(port, baud);
+	quot = quot / 2 - 1;
+
+	/* disable the baudrate generator */
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_R, port->membase + IFXMIPS_ASC_CON);
+
+	/* make sure the fractional divider is off */
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_FDE, port->membase + IFXMIPS_ASC_CON);
+
+	/* set up to use divisor of 2 */
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) & ~ASCCON_BRS, port->membase + IFXMIPS_ASC_CON);
+
+	/* now we can write the new baudrate into the register */
+	ifxmips_w32(quot, port->membase + IFXMIPS_ASC_BG);
+
+	/* turn the baudrate generator back on */
+	ifxmips_w32(ifxmips_r32(port->membase + IFXMIPS_ASC_CON) | ASCCON_R, port->membase + IFXMIPS_ASC_CON);
+
+	/* enable rx */
+	ifxmips_w32(ASCWHBSTATE_SETREN, port->membase + IFXMIPS_ASC_WHBSTATE);
+
+	local_irq_restore(flags);
+}
+
+static const char *ifxmipsasc_type(struct uart_port *port)
+{
+	if (port->type == PORT_IFXMIPSASC) {
+		if (port->membase == (void *)IFXMIPS_ASC_BASE_ADDR)
+			return "asc0";
+		else
+			return "asc1";
+	} else {
+		return NULL;
+	}
+}
+
+static void ifxmipsasc_release_port(struct uart_port *port)
+{
+}
+
+static int ifxmipsasc_request_port(struct uart_port *port)
+{
+	return 0;
+}
+
+static void ifxmipsasc_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE) {
+		port->type = PORT_IFXMIPSASC;
+		ifxmipsasc_request_port(port);
+	}
+}
+
+static int ifxmipsasc_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	int ret = 0;
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_IFXMIPSASC)
+		ret = -EINVAL;
+	if (ser->irq < 0 || ser->irq >= NR_IRQS)
+		ret = -EINVAL;
+	if (ser->baud_base < 9600)
+		ret = -EINVAL;
+	return ret;
+}
+
+static struct uart_ops ifxmipsasc_pops = {
+	.tx_empty =	ifxmipsasc_tx_empty,
+	.set_mctrl =	ifxmipsasc_set_mctrl,
+	.get_mctrl =	ifxmipsasc_get_mctrl,
+	.stop_tx =	ifxmipsasc_stop_tx,
+	.start_tx =	ifxmipsasc_start_tx,
+	.stop_rx =	ifxmipsasc_stop_rx,
+	.enable_ms =	ifxmipsasc_enable_ms,
+	.break_ctl =	ifxmipsasc_break_ctl,
+	.startup =	ifxmipsasc_startup,
+	.shutdown =	ifxmipsasc_shutdown,
+	.set_termios =	ifxmipsasc_set_termios,
+	.type =		ifxmipsasc_type,
+	.release_port =	ifxmipsasc_release_port,
+	.request_port =	ifxmipsasc_request_port,
+	.config_port =	ifxmipsasc_config_port,
+	.verify_port =	ifxmipsasc_verify_port,
+};
+
+static struct uart_port ifxmipsasc_port[2] = {
+	{
+		.membase =		(void *)IFXMIPS_ASC_BASE_ADDR,
+		.mapbase =		IFXMIPS_ASC_BASE_ADDR,
+		.iotype =		SERIAL_IO_MEM,
+		.irq =			IFXMIPSASC_TIR(0),
+		.uartclk =		0,
+		.fifosize =		16,
+		.type =			PORT_IFXMIPSASC,
+		.ops =			&ifxmipsasc_pops,
+		.flags =		ASYNC_BOOT_AUTOCONF,
+		.line =			0
+	}, {
+		.membase =		(void *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF),
+		.mapbase =		IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF,
+		.iotype =		SERIAL_IO_MEM,
+		.irq =			IFXMIPSASC_TIR(1),
+		.uartclk =		0,
+		.fifosize =		16,
+		.type =			PORT_IFXMIPSASC,
+		.ops =			&ifxmipsasc_pops,
+		.flags =		ASYNC_BOOT_AUTOCONF,
+		.line =			1
+	}
+};
+
+static void ifxmipsasc_console_write(struct console *co, const char *s, u_int count)
+{
+	int port = co->index;
+	int i, fifocnt;
+	unsigned long flags;
+	local_irq_save(flags);
+	for (i = 0; i < count; i++) {
+		do {
+			fifocnt = (ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_FSTAT)) & ASCFSTAT_TXFFLMASK)
+				>> ASCFSTAT_TXFFLOFF;
+		} while (fifocnt == TXFIFO_FULL);
+
+		if (s[i] == '\0')
+			break;
+
+		if (s[i] == '\n') {
+			ifxmips_w32('\r', (u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_TBUF));
+			do {
+				fifocnt = (ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_FSTAT)) & ASCFSTAT_TXFFLMASK)
+					>> ASCFSTAT_TXFFLOFF;
+			} while (fifocnt == TXFIFO_FULL);
+		}
+		ifxmips_w32(s[i], (u32 *)(IFXMIPS_ASC_BASE_ADDR + (port * IFXMIPS_ASC_BASE_DIFF) + IFXMIPS_ASC_TBUF));
+	}
+
+	local_irq_restore(flags);
+}
+
+static int __init ifxmipsasc_console_setup(struct console *co, char *options)
+{
+	int port = co->index;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+	ifxmipsasc_port[port].uartclk = ifxmips_get_fpi_hz();
+	ifxmipsasc_port[port].type = PORT_IFXMIPSASC;
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	return uart_set_options(&ifxmipsasc_port[port], co, baud, parity, bits, flow);
+}
+
+static struct console ifxmipsasc_console[2] =
+{
+	{
+		.name =		"ttyS",
+		.write =		ifxmipsasc_console_write,
+		.device =		uart_console_device,
+		.setup =		ifxmipsasc_console_setup,
+		.flags =		CON_PRINTBUFFER,
+		.index =		0,
+		.data =		&ifxmipsasc_reg,
+	}, {
+		.name =		"ttyS",
+		.write =	ifxmipsasc_console_write,
+		.device =	uart_console_device,
+		.setup =	ifxmipsasc_console_setup,
+		.flags =	CON_PRINTBUFFER,
+		.index =	1,
+		.data =		&ifxmipsasc_reg,
+	}
+};
+
+static int __init ifxmipsasc_console_init(void)
+{
+	register_console(&ifxmipsasc_console[0]);
+	register_console(&ifxmipsasc_console[1]);
+	return 0;
+}
+console_initcall(ifxmipsasc_console_init);
+
+static struct uart_driver ifxmipsasc_reg = {
+	.owner =	THIS_MODULE,
+	.driver_name =	"serial",
+	.dev_name =	"ttyS",
+	.major =	TTY_MAJOR,
+	.minor =	64,
+	.nr =		2,
+	.cons =		&ifxmipsasc_console[1],
+};
+
+int __init ifxmipsasc_init(void)
+{
+	int ret;
+	uart_register_driver(&ifxmipsasc_reg);
+	ret = uart_add_one_port(&ifxmipsasc_reg, &ifxmipsasc_port[0]);
+	ret = uart_add_one_port(&ifxmipsasc_reg, &ifxmipsasc_port[1]);
+	return 0;
+}
+
+void __exit ifxmipsasc_exit(void)
+{
+	uart_unregister_driver(&ifxmipsasc_reg);
+}
+
+module_init(ifxmipsasc_init);
+module_exit(ifxmipsasc_exit);
+
+MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("MIPS IFXMips serial port driver");
+MODULE_LICENSE("GPL");