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Subject[PATCH] 8250: Let arch provide the list of leagacy ports dynamically
From
Date
Hi !

This patch adds an optional callback for the 8250 driver to request
the list of legacy port via a function call instead of relying on
a #define of an array. This finally allows to fix the problem of
platforms like ppc and ppc64 for which the same kernel can boot
machines with and without a 8250, and is necessary to properly deal
with a new platform coming to ppc64 which has a 8250 but with
different irq numbers.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Index: linux-work/include/linux/8250.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-work/include/linux/8250.h 2004-10-23 09:03:30.751015360 +1000
@@ -0,0 +1,75 @@
+/*
+ * linux/drivers/char/8250.h
+ *
+ * Driver for 8250/16550-type serial ports
+ *
+ * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * Copyright (C) 2001 Russell King.
+ *
+ * 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.
+ *
+ * $Id: 8250.h,v 1.8 2002/07/21 21:32:30 rmk Exp $
+ */
+
+#include <linux/config.h>
+
+int serial8250_register_port(struct uart_port *);
+void serial8250_unregister_port(int line);
+void serial8250_get_irq_map(unsigned int *map);
+void serial8250_suspend_port(int line);
+void serial8250_resume_port(int line);
+
+struct old_serial_port {
+ unsigned int uart;
+ unsigned int baud_base;
+ unsigned int port;
+ unsigned int irq;
+ unsigned int flags;
+ unsigned char hub6;
+ unsigned char io_type;
+ unsigned char *iomem_base;
+ unsigned short iomem_reg_shift;
+};
+
+/*
+ * This replaces serial_uart_config in include/linux/serial.h
+ */
+struct serial8250_config {
+ const char *name;
+ unsigned short fifo_size;
+ unsigned short tx_loadsz;
+ unsigned char fcr;
+ unsigned int flags;
+};
+
+#define UART_CAP_FIFO (1 << 8) /* UART has FIFO */
+#define UART_CAP_EFR (1 << 9) /* UART has EFR */
+#define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */
+#define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */
+
+#undef SERIAL_DEBUG_PCI
+
+#if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
+#define SERIAL_INLINE
+#endif
+
+#ifdef SERIAL_INLINE
+#define _INLINE_ inline
+#else
+#define _INLINE_
+#endif
+
+#define PROBE_RSA (1 << 0)
+#define PROBE_ANY (~0)
+
+#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
+
+#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
+#define SERIAL8250_SHARE_IRQS 1
+#else
+#define SERIAL8250_SHARE_IRQS 0
+#endif
Index: linux-work/drivers/serial/8250.h
===================================================================
--- linux-work.orig/drivers/serial/8250.h 2004-10-20 13:01:02.000000000 +1000
+++ /dev/null1970-01-01 00:00:00.000000000 +0000
@@ -1,75 +0,0 @@
-/*
- * linux/drivers/char/8250.h
- *
- * Driver for 8250/16550-type serial ports
- *
- * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
- *
- * Copyright (C) 2001 Russell King.
- *
- * 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.
- *
- * $Id: 8250.h,v 1.8 2002/07/21 21:32:30 rmk Exp $
- */
-
-#include <linux/config.h>
-
-int serial8250_register_port(struct uart_port *);
-void serial8250_unregister_port(int line);
-void serial8250_get_irq_map(unsigned int *map);
-void serial8250_suspend_port(int line);
-void serial8250_resume_port(int line);
-
-struct old_serial_port {
- unsigned int uart;
- unsigned int baud_base;
- unsigned int port;
- unsigned int irq;
- unsigned int flags;
- unsigned char hub6;
- unsigned char io_type;
- unsigned char *iomem_base;
- unsigned short iomem_reg_shift;
-};
-
-/*
- * This replaces serial_uart_config in include/linux/serial.h
- */
-struct serial8250_config {
- const char *name;
- unsigned short fifo_size;
- unsigned short tx_loadsz;
- unsigned char fcr;
- unsigned int flags;
-};
-
-#define UART_CAP_FIFO (1 << 8) /* UART has FIFO */
-#define UART_CAP_EFR (1 << 9) /* UART has EFR */
-#define UART_CAP_SLEEP (1 << 10) /* UART has IER sleep */
-#define UART_CAP_AFE (1 << 11) /* MCR-based hw flow control */
-
-#undef SERIAL_DEBUG_PCI
-
-#if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
-#define SERIAL_INLINE
-#endif
-
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#else
-#define _INLINE_
-#endif
-
-#define PROBE_RSA (1 << 0)
-#define PROBE_ANY (~0)
-
-#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
-
-#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
-#define SERIAL8250_SHARE_IRQS 1
-#else
-#define SERIAL8250_SHARE_IRQS 0
-#endif
Index: linux-work/drivers/serial/au1x00_uart.c
===================================================================
--- linux-work.orig/drivers/serial/au1x00_uart.c 2004-09-24 14:34:50.000000000 +1000
+++ linux-work/drivers/serial/au1x00_uart.c 2004-10-23 09:06:15.159021544 +1000
@@ -29,6 +29,7 @@
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/delay.h>
+#include <linux/8250.h>

#include <asm/serial.h>
#include <asm/io.h>
@@ -40,7 +41,6 @@
#endif

#include <linux/serial_core.h>
-#include "8250.h"

/*
* Debugging.
Index: linux-work/drivers/serial/serial_cs.c
===================================================================
--- linux-work.orig/drivers/serial/serial_cs.c 2004-10-21 11:47:02.000000000 +1000
+++ linux-work/drivers/serial/serial_cs.c 2004-10-23 09:06:39.578309248 +1000
@@ -44,6 +44,7 @@
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/major.h>
+#include <linux/8250.h>
#include <asm/io.h>
#include <asm/system.h>

@@ -55,8 +56,6 @@
#include <pcmcia/ds.h>
#include <pcmcia/cisreg.h>

-#include "8250.h"
-
#ifdef PCMCIA_DEBUG
static int pc_debug = PCMCIA_DEBUG;
MODULE_PARM(pc_debug, "i");
Index: linux-work/drivers/serial/8250_pnp.c
===================================================================
--- linux-work.orig/drivers/serial/8250_pnp.c 2004-10-22 10:35:47.000000000 +1000
+++ linux-work/drivers/serial/8250_pnp.c 2004-10-23 09:05:52.738429992 +1000
@@ -26,12 +26,11 @@
#include <linux/serialP.h>
#include <linux/serial_core.h>
#include <linux/bitops.h>
+#include <linux/8250.h>

#include <asm/byteorder.h>
#include <asm/serial.h>

-#include "8250.h"
-
#define UNKNOWN_DEV 0x3000


Index: linux-work/drivers/serial/8250_pci.c
===================================================================
--- linux-work.orig/drivers/serial/8250_pci.c 2004-10-21 11:47:02.000000000 +1000
+++ linux-work/drivers/serial/8250_pci.c 2004-10-23 09:33:39.766003280 +1000
@@ -23,13 +23,13 @@
#include <linux/delay.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
-#include <linux/8250_pci.h>
#include <linux/bitops.h>
+#include <linux/8250.h>
+#include <linux/8250_pci.h>

#include <asm/byteorder.h>
#include <asm/io.h>

-#include "8250.h"

/*
* Definitions for PCI support.
Index: linux-work/drivers/serial/8250.c
===================================================================
--- linux-work.orig/drivers/serial/8250.c 2004-10-21 11:47:02.000000000 +1000
+++ linux-work/drivers/serial/8250.c 2004-10-23 09:31:25.530410192 +1000
@@ -32,6 +32,7 @@
#include <linux/serialP.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/8250.h>

#include <asm/io.h>
#include <asm/irq.h>
@@ -41,7 +42,6 @@
#endif

#include <linux/serial_core.h>
-#include "8250.h"

/*
* Configuration:
@@ -112,11 +112,17 @@
#define SERIAL_PORT_DFNS
#endif

+#ifndef ARCH_HAS_GET_LEGACY_SERIAL_PORTS
static struct old_serial_port old_serial_port[] = {
SERIAL_PORT_DFNS /* defined in asm/serial.h */
};
-
+static inline struct old_serial_port *get_legacy_serial_ports(unsigned int *count)
+{
+ *count = ARRAY_SIZE(old_serial_port);
+ return old_serial_port;
+}
#define UART_NR (ARRAY_SIZE(old_serial_port) + CONFIG_SERIAL_8250_NR_UARTS)
+#endif /* ARCH_HAS_DYNAMIC_LEGACY_SERIAL_PORTS */

#ifdef CONFIG_SERIAL_8250_RSA

@@ -1958,22 +1964,27 @@
{
struct uart_8250_port *up;
static int first = 1;
+ struct old_serial_port *old_ports;
+ int count;
int i;

if (!first)
return;
first = 0;

- for (i = 0, up = serial8250_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.hub6 = old_serial_port[i].hub6;
- 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;
+ old_ports = get_legacy_serial_ports(&count);
+ if (old_ports == NULL)
+ return;
+
+ for (i = 0, up = serial8250_ports; i < count; i++, up++) {
+ up->port.iobase = old_ports[i].port;
+ up->port.irq = irq_canonicalize(old_ports[i].irq);
+ up->port.uartclk = old_ports[i].baud_base * 16;
+ up->port.flags = old_ports[i].flags;
+ up->port.hub6 = old_ports[i].hub6;
+ up->port.membase = old_ports[i].iomem_base;
+ up->port.iotype = old_ports[i].io_type;
+ up->port.regshift = old_ports[i].iomem_reg_shift;
up->port.ops = &serial8250_pops;
if (share_irqs)
up->port.flags |= UPF_SHARE_IRQ;
@@ -1990,6 +2001,13 @@
for (i = 0; i < UART_NR; i++) {
struct uart_8250_port *up = &serial8250_ports[i];

+ /* Don't register "empty" ports, setting "ops" on them
+ * makes the console driver "setup" routine to succeed,
+ * which is wrong. --BenH.
+ */
+ if (!up->port.iobase)
+ continue;
+
up->port.line = i;
up->port.ops = &serial8250_pops;
up->port.dev = dev;

-
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