serial: allow 8250 to be used on sparc

This requires three changes:

1) Remove !SPARC restriction in Kconfig.

2) Move Sparc specific serial drivers before 8250, so that serial
console devices don't change names on us, even if 8250 finds
devices.

3) Since the Sparc specific serial drivers try to use the
same major/minor device namespace as 8250, some coordination
is necessary. Use the sunserial_*() layer routines to allocate
minor number space within TTY_MAJOR when CONFIG_SPARC.

This has no effect on other platforms.

Thanks to Josip Rodin for bringing up this issue and testing
plus debugging various revisions of this patch.

Signed-off-by: David S. Miller <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Alan Cox <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/sparc/include/asm/serial.h

···
+#ifndef __SPARC_SERIAL_H
+#define __SPARC_SERIAL_H
+
+#define BASE_BAUD ( 1843200 / 16 )
+
+#endif /* __SPARC_SERIAL_H */

drivers/serial/8250.c

···
 
 #include "8250.h"
 
+#ifdef CONFIG_SPARC
+#include "suncore.h"
+#endif
+
 /*
  * Configuration:
  *   share_irqs - whether we pass IRQF_SHARED to request_irq().  This option
···
 	.dev_name		= "ttyS",
 	.major			= TTY_MAJOR,
 	.minor			= 64,
-	.nr			= UART_NR,
 	.cons			= SERIAL8250_CONSOLE,
 };
 
···
 		"%d ports, IRQ sharing %sabled\n", nr_uarts,
 		share_irqs ? "en" : "dis");
 
-	for (i = 0; i < NR_IRQS; i++)
-		spin_lock_init(&irq_lists[i].lock);
-
+#ifdef CONFIG_SPARC
+	ret = sunserial_register_minors(&serial8250_reg, UART_NR);
+#else
+	serial8250_reg.nr = UART_NR;
 	ret = uart_register_driver(&serial8250_reg);
+#endif
 	if (ret)
 		goto out;
 
···
  put_dev:
 	platform_device_put(serial8250_isa_devs);
  unreg_uart_drv:
+#ifdef CONFIG_SPARC
+	sunserial_unregister_minors(&serial8250_reg, UART_NR);
+#else
 	uart_unregister_driver(&serial8250_reg);
+#endif
  out:
 	return ret;
 }
···
 	platform_driver_unregister(&serial8250_isa_driver);
 	platform_device_unregister(isa_dev);
 
+#ifdef CONFIG_SPARC
+	sunserial_unregister_minors(&serial8250_reg, UART_NR);
+#else
 	uart_unregister_driver(&serial8250_reg);
+#endif
 }
 
 module_init(serial8250_init);

drivers/serial/Kconfig

···
 # The new 8250/16550 serial drivers
 config SERIAL_8250
 	tristate "8250/16550 and compatible serial support"
-	depends on (BROKEN || !SPARC)
 	select SERIAL_CORE
 	---help---
 	  This selects whether you want to include the driver for the standard

drivers/serial/Makefile

···
 
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o
 obj-$(CONFIG_SERIAL_21285) += 21285.o
+
+# These Sparc drivers have to appear before others such as 8250
+# which share ttySx minor node space.  Otherwise console device
+# names change and other unplesantries.
+obj-$(CONFIG_SERIAL_SUNCORE) += suncore.o
+obj-$(CONFIG_SERIAL_SUNHV) += sunhv.o
+obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
+obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
+obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
+
 obj-$(CONFIG_SERIAL_8250) += 8250.o
 obj-$(CONFIG_SERIAL_8250_PNP) += 8250_pnp.o
 obj-$(CONFIG_SERIAL_8250_GSC) += 8250_gsc.o
···
 obj-$(CONFIG_SERIAL_S3C2410) += s3c2410.o
 obj-$(CONFIG_SERIAL_S3C2412) += s3c2412.o
 obj-$(CONFIG_SERIAL_S3C2440) += s3c2440.o
-obj-$(CONFIG_SERIAL_SUNCORE) += suncore.o
-obj-$(CONFIG_SERIAL_SUNHV) += sunhv.o
-obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
-obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
-obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
 obj-$(CONFIG_SERIAL_MUX) += mux.o
 obj-$(CONFIG_SERIAL_68328) += 68328serial.o
 obj-$(CONFIG_SERIAL_68360) += 68360serial.o