sh: Bring kgdb back from the dead.

This code has suffered quite a bit of bitrot, do some basic
tidying to get it to a reasonably functional state again.
This gets the basic support and the console working again.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig.debug

@@ -77,16 +77,17 @@ config 4KSTACKS
 	  on the VM subsystem for higher order allocations. This option
 	  will also use IRQ stacks to compensate for the reduced stackspace.
 
-config KGDB
+config SH_KGDB
 	bool "Include KGDB kernel debugger"
 	select FRAME_POINTER
+	select DEBUG_INFO
 	help
 	  Include in-kernel hooks for kgdb, the Linux kernel source level
 	  debugger.  See <http://kgdb.sourceforge.net/> for more information.
 	  Unless you are intending to debug the kernel, say N here.
 
 menu "KGDB configuration options"
-	depends on KGDB
+	depends on SH_KGDB
 
 config MORE_COMPILE_OPTIONS
 	bool "Add any additional compile options"
@@ -109,16 +110,14 @@ config KGDB_THREAD
 
 config SH_KGDB_CONSOLE
 	bool "Console messages through GDB"
+	depends on !SERIAL_SH_SCI_CONSOLE
+	select SERIAL_CORE_CONSOLE
 	default n
 
 config KGDB_SYSRQ
 	bool "Allow SysRq 'G' to enter KGDB"
 	default y
 
-config KGDB_KERNEL_ASSERTS
-	bool "Include KGDB kernel assertions"
-	default n
-
 comment "Serial port setup"
 
 config KGDB_DEFPORT
@@ -131,7 +130,7 @@ config KGDB_DEFBAUD
 
 choice
 	prompt "Parity"
-	depends on KGDB
+	depends on SH_KGDB
 	default KGDB_DEFPARITY_N
 
 config KGDB_DEFPARITY_N
@@ -147,7 +146,7 @@ endchoice
 
 choice
 	prompt "Data bits"
-	depends on KGDB
+	depends on SH_KGDB
 	default KGDB_DEFBITS_8
 
 config KGDB_DEFBITS_8

arch/sh/Makefile

@@ -47,7 +47,6 @@ cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -ml
 cflags-y	+= $(call as-option,-Wa$(comma)-isa=$(isa-y),) -ffreestanding
 
 cflags-$(CONFIG_SH_DSP)			+= -Wa,-dsp
-cflags-$(CONFIG_SH_KGDB)		+= -g
 
 cflags-$(CONFIG_MORE_COMPILE_OPTIONS)	+= \
 	$(shell echo $(CONFIG_COMPILE_OPTIONS) | sed -e 's/"//g')

arch/sh/boards/se/7751/setup.c

@@ -14,153 +14,6 @@
 #include <asm/se7751.h>
 #include <asm/io.h>
 
-void init_7751se_IRQ(void);
-
-#ifdef CONFIG_SH_KGDB
-#include <asm/kgdb.h>
-static int kgdb_uart_setup(void);
-static struct kgdb_sermap kgdb_uart_sermap = 
-{ "ttyS", 0, kgdb_uart_setup, NULL };
-#endif
-
-/*
- * Initialize the board
- */
-static void __init sh7751se_setup(char **cmdline_p)
-{
-	/* Call init_smsc() replacement to set up SuperIO. */
-	/* XXX: RTC setting comes here */
-#ifdef CONFIG_SH_KGDB
-	kgdb_register_sermap(&kgdb_uart_sermap);
-#endif
-}
-
-/*********************************************************************
- * Currently a hack (e.g. does not interact well w/serial.c, lots of *
- * hardcoded stuff) but may be useful if SCI/F needs debugging.      *
- * Mostly copied from x86 code (see files asm-i386/kgdb_local.h and  *
- * arch/i386/lib/kgdb_serial.c).                                     *
- *********************************************************************/
-
-#ifdef CONFIG_SH_KGDB
-#include <linux/types.h>
-#include <linux/serial.h>
-#include <linux/serialP.h>
-#include <linux/serial_reg.h>
-
-#define COM1_PORT 0x3f8  /* Base I/O address */
-#define COM1_IRQ  4      /* IRQ not used yet */
-#define COM2_PORT 0x2f8  /* Base I/O address */
-#define COM2_IRQ  3      /* IRQ not used yet */
-
-#define SB_CLOCK 1843200 /* Serial baud clock */
-#define SB_BASE (SB_CLOCK/16)
-#define SB_MCR UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS
-
-struct uart_port {
-	int base;
-};
-#define UART_NPORTS 2
-struct uart_port uart_ports[] = {
-	{ COM1_PORT },
-	{ COM2_PORT },
-};
-struct uart_port *kgdb_uart_port;
-
-#define UART_IN(reg)	inb_p(kgdb_uart_port->base + reg)
-#define UART_OUT(reg,v)	outb_p((v), kgdb_uart_port->base + reg)
-
-/* Basic read/write functions for the UART */
-#define UART_LSR_RXCERR    (UART_LSR_BI | UART_LSR_FE | UART_LSR_PE)
-static int kgdb_uart_getchar(void)
-{
-	int lsr;
-	int c = -1;
-
-	while (c == -1) {
-		lsr = UART_IN(UART_LSR);
-		if (lsr & UART_LSR_DR) 
-			c = UART_IN(UART_RX);
-		if ((lsr & UART_LSR_RXCERR))
-			c = -1;
-	}
-	return c;
-}
-
-static void kgdb_uart_putchar(int c)
-{
-	while ((UART_IN(UART_LSR) & UART_LSR_THRE) == 0)
-		;
-	UART_OUT(UART_TX, c);
-}
-
-/*
- * Initialize UART to configured/requested values.
- * (But we don't interrupts yet, or interact w/serial.c)
- */
-static int kgdb_uart_setup(void)
-{
-	int port;
-	int lcr = 0;
-	int bdiv = 0;
-
-	if (kgdb_portnum >= UART_NPORTS) {
-		KGDB_PRINTK("uart port %d invalid.\n", kgdb_portnum);
-		return -1;
-	}
-
-	kgdb_uart_port = &uart_ports[kgdb_portnum];
-
-	/* Init sequence from gdb_hook_interrupt */
-	UART_IN(UART_RX);
-	UART_OUT(UART_IER, 0);
-
-	UART_IN(UART_RX);	/* Serial driver comments say */
-	UART_IN(UART_IIR);	/* this clears interrupt regs */
-	UART_IN(UART_MSR);
-
-	/* Figure basic LCR values */
-	switch (kgdb_bits) {
-	case '7':
-		lcr |= UART_LCR_WLEN7;
-		break;
-	default: case '8': 
-		lcr |= UART_LCR_WLEN8;
-		break;
-	}
-	switch (kgdb_parity) {
-	case 'O':
-		lcr |= UART_LCR_PARITY;
-		break;
-	case 'E':
-		lcr |= (UART_LCR_PARITY | UART_LCR_EPAR);
-		break;
-	default: break;
-	}
-
-	/* Figure the baud rate divisor */
-	bdiv = (SB_BASE/kgdb_baud);
-
-	/* Set the baud rate and LCR values */
-	UART_OUT(UART_LCR, (lcr | UART_LCR_DLAB));
-	UART_OUT(UART_DLL, (bdiv & 0xff));
-	UART_OUT(UART_DLM, ((bdiv >> 8) & 0xff));
-	UART_OUT(UART_LCR, lcr);
-
-	/* Set the MCR */
-	UART_OUT(UART_MCR, SB_MCR);
-
-	/* Turn off FIFOs for now */
-	UART_OUT(UART_FCR, 0);
-
-	/* Setup complete: initialize function pointers */
-	kgdb_getchar = kgdb_uart_getchar;
-	kgdb_putchar = kgdb_uart_putchar;
-
-	return 0;
-}
-#endif /* CONFIG_SH_KGDB */
-
 static unsigned char heartbeat_bit_pos[] = { 8, 9, 10, 11, 12, 13, 14, 15 };
 
 static struct resource heartbeat_resources[] = {
@@ -197,7 +50,6 @@ __initcall(se7751_devices_setup);
  */
 struct sh_machine_vector mv_7751se __initmv = {
 	.mv_name		= "7751 SolutionEngine",
-	.mv_setup		= sh7751se_setup,
 	.mv_nr_irqs		= 72,
 
 	.mv_inb			= sh7751se_inb,