X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fserial%2Fdz.c;h=a81d2c2ff8a2d9d1a71e26cbbdc1411668582ade;hb=a88487c79bfefb715030c5baa68fbedc1b8732e8;hp=c054c1bd8b24fa27a1542087fdca317b87ecc205;hpb=f5519caad5c1828b2ab6d14bd9e7a8e047db12e3;p=linux-2.6

diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c
index c054c1bd8b..a81d2c2ff8 100644
--- a/drivers/serial/dz.c
+++ b/drivers/serial/dz.c
@@ -39,6 +39,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/ioport.h>
 #include <linux/kernel.h>
 #include <linux/major.h>
 #include <linux/module.h>
@@ -47,7 +48,9 @@
 #include <linux/sysrq.h>
 #include <linux/tty.h>
 
+#include <asm/atomic.h>
 #include <asm/bootinfo.h>
+#include <asm/io.h>
 #include <asm/system.h>
 
 #include <asm/dec/interrupts.h>
@@ -55,18 +58,32 @@
 #include <asm/dec/kn02.h>
 #include <asm/dec/machtype.h>
 #include <asm/dec/prom.h>
+#include <asm/dec/system.h>
 
 #include "dz.h"
 
-static char *dz_name = "DECstation DZ serial driver version ";
-static char *dz_version = "1.03";
+
+MODULE_DESCRIPTION("DECstation DZ serial driver");
+MODULE_LICENSE("GPL");
+
+
+static char dz_name[] __initdata = "DECstation DZ serial driver version ";
+static char dz_version[] __initdata = "1.04";
 
 struct dz_port {
+	struct dz_mux		*mux;
 	struct uart_port	port;
 	unsigned int		cflag;
 };
 
-static struct dz_port dz_ports[DZ_NB_PORT];
+struct dz_mux {
+	struct dz_port		dport[DZ_NB_PORT];
+	atomic_t		map_guard;
+	atomic_t		irq_guard;
+	int			initialised;
+};
+
+static struct dz_mux dz_mux;
 
 static inline struct dz_port *to_dport(struct uart_port *uport)
 {
@@ -82,21 +99,18 @@ static inline struct dz_port *to_dport(struct uart_port *uport)
  * ------------------------------------------------------------
  */
 
-static inline unsigned short dz_in(struct dz_port *dport, unsigned offset)
+static u16 dz_in(struct dz_port *dport, unsigned offset)
 {
-	volatile unsigned short *addr =
-		(volatile unsigned short *) (dport->port.membase + offset);
+	void __iomem *addr = dport->port.membase + offset;
 
-	return *addr;
+	return readw(addr);
 }
 
-static inline void dz_out(struct dz_port *dport, unsigned offset,
-                          unsigned short value)
+static void dz_out(struct dz_port *dport, unsigned offset, u16 value)
 {
-	volatile unsigned short *addr =
-		(volatile unsigned short *) (dport->port.membase + offset);
+	void __iomem *addr = dport->port.membase + offset;
 
-	*addr = value;
+	writew(value, addr);
 }
 
 /*
@@ -112,7 +126,7 @@ static inline void dz_out(struct dz_port *dport, unsigned offset,
 static void dz_stop_tx(struct uart_port *uport)
 {
 	struct dz_port *dport = to_dport(uport);
-	unsigned short tmp, mask = 1 << dport->port.line;
+	u16 tmp, mask = 1 << dport->port.line;
 
 	tmp = dz_in(dport, DZ_TCR);	/* read the TX flag */
 	tmp &= ~mask;			/* clear the TX flag */
@@ -122,7 +136,7 @@ static void dz_stop_tx(struct uart_port *uport)
 static void dz_start_tx(struct uart_port *uport)
 {
 	struct dz_port *dport = to_dport(uport);
-	unsigned short tmp, mask = 1 << dport->port.line;
+	u16 tmp, mask = 1 << dport->port.line;
 
 	tmp = dz_in(dport, DZ_TCR);	/* read the TX flag */
 	tmp |= mask;			/* set the TX flag */
@@ -137,7 +151,7 @@ static void dz_stop_rx(struct uart_port *uport)
 	dz_out(dport, DZ_LPR, dport->cflag);
 }
 
-static void dz_enable_ms(struct uart_port *port)
+static void dz_enable_ms(struct uart_port *uport)
 {
 	/* nothing to do */
 }
@@ -169,21 +183,21 @@ static void dz_enable_ms(struct uart_port *port)
  * This routine deals with inputs from any lines.
  * ------------------------------------------------------------
  */
-static inline void dz_receive_chars(struct dz_port *dport_in)
+static inline void dz_receive_chars(struct dz_mux *mux)
 {
 	struct uart_port *uport;
-	struct dz_port *dport;
+	struct dz_port *dport = &mux->dport[0];
 	struct tty_struct *tty = NULL;
 	struct uart_icount *icount;
 	int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
-	unsigned short status;
 	unsigned char ch, flag;
+	u16 status;
 	int i;
 
-	while ((status = dz_in(dport_in, DZ_RBUF)) & DZ_DVAL) {
-		dport = &dz_ports[LINE(status)];
+	while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
+		dport = &mux->dport[LINE(status)];
 		uport = &dport->port;
-		tty = uport->info->tty;		/* point to the proper dev */
+		tty = uport->info->port.tty;	/* point to the proper dev */
 
 		ch = UCHAR(status);		/* grab the char */
 		flag = TTY_NORMAL;
@@ -235,7 +249,7 @@ static inline void dz_receive_chars(struct dz_port *dport_in)
 	}
 	for (i = 0; i < DZ_NB_PORT; i++)
 		if (lines_rx[i])
-			tty_flip_buffer_push(dz_ports[i].port.info->tty);
+			tty_flip_buffer_push(mux->dport[i].port.info->port.tty);
 }
 
 /*
@@ -245,15 +259,15 @@ static inline void dz_receive_chars(struct dz_port *dport_in)
  * This routine deals with outputs to any lines.
  * ------------------------------------------------------------
  */
-static inline void dz_transmit_chars(struct dz_port *dport_in)
+static inline void dz_transmit_chars(struct dz_mux *mux)
 {
-	struct dz_port *dport;
+	struct dz_port *dport = &mux->dport[0];
 	struct circ_buf *xmit;
-	unsigned short status;
 	unsigned char tmp;
+	u16 status;
 
-	status = dz_in(dport_in, DZ_CSR);
-	dport = &dz_ports[LINE(status)];
+	status = dz_in(dport, DZ_CSR);
+	dport = &mux->dport[LINE(status)];
 	xmit = &dport->port.info->xmit;
 
 	if (dport->port.x_char) {		/* XON/XOFF chars */
@@ -305,7 +319,7 @@ static inline void check_modem_status(struct dz_port *dport)
 	 * 1. No status change interrupt; use a timer.
 	 * 2. Handle the 3100/5000 as appropriate. --macro
 	 */
-	unsigned short status;
+	u16 status;
 
 	/* If not the modem line just return.  */
 	if (dport->port.line != DZ_MODEM)
@@ -326,19 +340,20 @@ static inline void check_modem_status(struct dz_port *dport)
  * It deals with the multiple ports.
  * ------------------------------------------------------------
  */
-static irqreturn_t dz_interrupt(int irq, void *dev)
+static irqreturn_t dz_interrupt(int irq, void *dev_id)
 {
-	struct dz_port *dport = dev;
-	unsigned short status;
+	struct dz_mux *mux = dev_id;
+	struct dz_port *dport = &mux->dport[0];
+	u16 status;
 
 	/* get the reason why we just got an irq */
 	status = dz_in(dport, DZ_CSR);
 
 	if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
-		dz_receive_chars(dport);
+		dz_receive_chars(mux);
 
 	if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
-		dz_transmit_chars(dport);
+		dz_transmit_chars(mux);
 
 	return IRQ_HANDLED;
 }
@@ -371,7 +386,7 @@ static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
 	 * FIXME: Handle the 3100/5000 as appropriate. --macro
 	 */
 	struct dz_port *dport = to_dport(uport);
-	unsigned short tmp;
+	u16 tmp;
 
 	if (dport->port.line == DZ_MODEM) {
 		tmp = dz_in(dport, DZ_TCR);
@@ -393,14 +408,29 @@ static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
 static int dz_startup(struct uart_port *uport)
 {
 	struct dz_port *dport = to_dport(uport);
+	struct dz_mux *mux = dport->mux;
 	unsigned long flags;
-	unsigned short tmp;
+	int irq_guard;
+	int ret;
+	u16 tmp;
+
+	irq_guard = atomic_add_return(1, &mux->irq_guard);
+	if (irq_guard != 1)
+		return 0;
+
+	ret = request_irq(dport->port.irq, dz_interrupt,
+			  IRQF_SHARED, "dz", mux);
+	if (ret) {
+		atomic_add(-1, &mux->irq_guard);
+		printk(KERN_ERR "dz: Cannot get IRQ %d!\n", dport->port.irq);
+		return ret;
+	}
 
 	spin_lock_irqsave(&dport->port.lock, flags);
 
-	/* enable the interrupt and the scanning */
+	/* Enable interrupts.  */
 	tmp = dz_in(dport, DZ_CSR);
-	tmp |= DZ_RIE | DZ_TIE | DZ_MSE;
+	tmp |= DZ_RIE | DZ_TIE;
 	dz_out(dport, DZ_CSR, tmp);
 
 	spin_unlock_irqrestore(&dport->port.lock, flags);
@@ -419,11 +449,24 @@ static int dz_startup(struct uart_port *uport)
 static void dz_shutdown(struct uart_port *uport)
 {
 	struct dz_port *dport = to_dport(uport);
+	struct dz_mux *mux = dport->mux;
 	unsigned long flags;
+	int irq_guard;
+	u16 tmp;
 
 	spin_lock_irqsave(&dport->port.lock, flags);
 	dz_stop_tx(&dport->port);
 	spin_unlock_irqrestore(&dport->port.lock, flags);
+
+	irq_guard = atomic_add_return(-1, &mux->irq_guard);
+	if (!irq_guard) {
+		/* Disable interrupts.  */
+		tmp = dz_in(dport, DZ_CSR);
+		tmp &= ~(DZ_RIE | DZ_TIE);
+		dz_out(dport, DZ_CSR, tmp);
+
+		free_irq(dport->port.irq, mux);
+	}
 }
 
 /*
@@ -507,6 +550,24 @@ static int dz_encode_baud_rate(unsigned int baud)
 	}
 }
 
+
+static void dz_reset(struct dz_port *dport)
+{
+	struct dz_mux *mux = dport->mux;
+
+	if (mux->initialised)
+		return;
+
+	dz_out(dport, DZ_CSR, DZ_CLR);
+	while (dz_in(dport, DZ_CSR) & DZ_CLR);
+	iob();
+
+	/* Enable scanning.  */
+	dz_out(dport, DZ_CSR, DZ_MSE);
+
+	mux->initialised = 1;
+}
+
 static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
 			   struct ktermios *old_termios)
 {
@@ -581,36 +642,86 @@ static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
 	spin_unlock_irqrestore(&dport->port.lock, flags);
 }
 
-static const char *dz_type(struct uart_port *port)
+static const char *dz_type(struct uart_port *uport)
 {
 	return "DZ";
 }
 
-static void dz_release_port(struct uart_port *port)
+static void dz_release_port(struct uart_port *uport)
 {
-	/* nothing to do */
+	struct dz_mux *mux = to_dport(uport)->mux;
+	int map_guard;
+
+	iounmap(uport->membase);
+	uport->membase = NULL;
+
+	map_guard = atomic_add_return(-1, &mux->map_guard);
+	if (!map_guard)
+		release_mem_region(uport->mapbase, dec_kn_slot_size);
 }
 
-static int dz_request_port(struct uart_port *port)
+static int dz_map_port(struct uart_port *uport)
 {
+	if (!uport->membase)
+		uport->membase = ioremap_nocache(uport->mapbase,
+						 dec_kn_slot_size);
+	if (!uport->membase) {
+		printk(KERN_ERR "dz: Cannot map MMIO\n");
+		return -ENOMEM;
+	}
 	return 0;
 }
 
-static void dz_config_port(struct uart_port *port, int flags)
+static int dz_request_port(struct uart_port *uport)
 {
-	if (flags & UART_CONFIG_TYPE)
-		port->type = PORT_DZ;
+	struct dz_mux *mux = to_dport(uport)->mux;
+	int map_guard;
+	int ret;
+
+	map_guard = atomic_add_return(1, &mux->map_guard);
+	if (map_guard == 1) {
+		if (!request_mem_region(uport->mapbase, dec_kn_slot_size,
+					"dz")) {
+			atomic_add(-1, &mux->map_guard);
+			printk(KERN_ERR
+			       "dz: Unable to reserve MMIO resource\n");
+			return -EBUSY;
+		}
+	}
+	ret = dz_map_port(uport);
+	if (ret) {
+		map_guard = atomic_add_return(-1, &mux->map_guard);
+		if (!map_guard)
+			release_mem_region(uport->mapbase, dec_kn_slot_size);
+		return ret;
+	}
+	return 0;
+}
+
+static void dz_config_port(struct uart_port *uport, int flags)
+{
+	struct dz_port *dport = to_dport(uport);
+
+	if (flags & UART_CONFIG_TYPE) {
+		if (dz_request_port(uport))
+			return;
+
+		uport->type = PORT_DZ;
+
+		dz_reset(dport);
+	}
 }
 
 /*
- * verify the new serial_struct (for TIOCSSERIAL).
+ * Verify the new serial_struct (for TIOCSSERIAL).
  */
-static int dz_verify_port(struct uart_port *port, struct serial_struct *ser)
+static int dz_verify_port(struct uart_port *uport, struct serial_struct *ser)
 {
 	int ret = 0;
+
 	if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
 		ret = -EINVAL;
-	if (ser->irq != port->irq)
+	if (ser->irq != uport->irq)
 		ret = -EINVAL;
 	return ret;
 }
@@ -637,40 +748,32 @@ static struct uart_ops dz_ops = {
 static void __init dz_init_ports(void)
 {
 	static int first = 1;
-	struct dz_port *dport;
 	unsigned long base;
-	int i;
+	int line;
 
 	if (!first)
 		return;
 	first = 0;
 
-	if (mips_machtype == MACH_DS23100 ||
-	    mips_machtype == MACH_DS5100)
-		base = CKSEG1ADDR(KN01_SLOT_BASE + KN01_DZ11);
+	if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100)
+		base = dec_kn_slot_base + KN01_DZ11;
 	else
-		base = CKSEG1ADDR(KN02_SLOT_BASE + KN02_DZ11);
-
-	for (i = 0, dport = dz_ports; i < DZ_NB_PORT; i++, dport++) {
-		spin_lock_init(&dport->port.lock);
-		dport->port.membase	= (char *) base;
-		dport->port.iotype	= UPIO_MEM;
-		dport->port.irq		= dec_interrupt[DEC_IRQ_DZ11];
-		dport->port.line	= i;
-		dport->port.fifosize	= 1;
-		dport->port.ops		= &dz_ops;
-		dport->port.flags	= UPF_BOOT_AUTOCONF;
-	}
-}
+		base = dec_kn_slot_base + KN02_DZ11;
 
-static void dz_reset(struct dz_port *dport)
-{
-	dz_out(dport, DZ_CSR, DZ_CLR);
-	while (dz_in(dport, DZ_CSR) & DZ_CLR);
-	iob();
+	for (line = 0; line < DZ_NB_PORT; line++) {
+		struct dz_port *dport = &dz_mux.dport[line];
+		struct uart_port *uport = &dport->port;
 
-	/* enable scanning */
-	dz_out(dport, DZ_CSR, DZ_MSE);
+		dport->mux	= &dz_mux;
+
+		uport->irq	= dec_interrupt[DEC_IRQ_DZ11];
+		uport->fifosize	= 1;
+		uport->iotype	= UPIO_MEM;
+		uport->flags	= UPF_BOOT_AUTOCONF;
+		uport->ops	= &dz_ops;
+		uport->line	= line;
+		uport->mapbase	= base;
+	}
 }
 
 #ifdef CONFIG_SERIAL_DZ_CONSOLE
@@ -716,7 +819,7 @@ static void dz_console_putchar(struct uart_port *uport, int ch)
 		dz_out(dport, DZ_TCR, mask);
 		iob();
 		udelay(2);
-	} while (loops--);
+	} while (--loops);
 
 	if (loops)				/* Cannot send otherwise. */
 		dz_out(dport, DZ_TDR, ch);
@@ -737,7 +840,7 @@ static void dz_console_print(struct console *co,
 			     const char *str,
 			     unsigned int count)
 {
-	struct dz_port *dport = &dz_ports[co->index];
+	struct dz_port *dport = &dz_mux.dport[co->index];
 #ifdef DEBUG_DZ
 	prom_printf((char *) str);
 #endif
@@ -746,17 +849,23 @@ static void dz_console_print(struct console *co,
 
 static int __init dz_console_setup(struct console *co, char *options)
 {
-	struct dz_port *dport = &dz_ports[co->index];
+	struct dz_port *dport = &dz_mux.dport[co->index];
+	struct uart_port *uport = &dport->port;
 	int baud = 9600;
 	int bits = 8;
 	int parity = 'n';
 	int flow = 'n';
+	int ret;
 
-	if (options)
-		uart_parse_options(options, &baud, &parity, &bits, &flow);
+	ret = dz_map_port(uport);
+	if (ret)
+		return ret;
 
 	dz_reset(dport);
 
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
 	return uart_set_options(&dport->port, co, baud, parity, bits, flow);
 }
 
@@ -809,36 +918,14 @@ static int __init dz_init(void)
 
 	dz_init_ports();
 
-#ifndef CONFIG_SERIAL_DZ_CONSOLE
-	/* reset the chip */
-	dz_reset(&dz_ports[0]);
-#endif
-
 	ret = uart_register_driver(&dz_reg);
-	if (ret != 0)
-		goto out;
-
-	ret = request_irq(dz_ports[0].port.irq, dz_interrupt, IRQF_DISABLED,
-			  "DZ", &dz_ports[0]);
-	if (ret != 0) {
-		printk(KERN_ERR "dz: Cannot get IRQ %d!\n",
-		       dz_ports[0].port.irq);
-		goto out_unregister;
-	}
+	if (ret)
+		return ret;
 
 	for (i = 0; i < DZ_NB_PORT; i++)
-		uart_add_one_port(&dz_reg, &dz_ports[i].port);
-
-	return ret;
+		uart_add_one_port(&dz_reg, &dz_mux.dport[i].port);
 
-out_unregister:
-	uart_unregister_driver(&dz_reg);
-
-out:
-	return ret;
+	return 0;
 }
 
 module_init(dz_init);
-
-MODULE_DESCRIPTION("DECstation DZ serial driver");
-MODULE_LICENSE("GPL");