x86, VisWS: turn into generic arch, add early init quirks

add early init quirks for VisWS. This gradually turns the VISWS subarch
into a generic PC architecture.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -186,7 +186,7 @@ config X86_HT
 
 config X86_BIOS_REBOOT
 	bool
-	depends on !X86_VISWS && !X86_VOYAGER
+	depends on !X86_VOYAGER
 	default y
 
 config X86_TRAMPOLINE

arch/x86/mach-visws/Makefile

@@ -2,7 +2,7 @@
 # Makefile for the linux kernel.
 #
 
-obj-y				:= setup.o traps.o reboot.o
+obj-y				:= setup.o setup_visws.o traps.o
 
 obj-$(CONFIG_X86_VISWS_APIC)	+= visws_apic.o
 obj-$(CONFIG_X86_LOCAL_APIC)	+= mpparse.o

arch/x86/mach-visws/setup.c

@@ -10,6 +10,14 @@
 #include <asm/e820.h>
 #include <asm/setup.h>
 
+/*
+ * Any quirks to be performed to initialize timers/irqs/etc?
+ */
+int (*arch_time_init_quirk)(void);
+int (*arch_pre_intr_init_quirk)(void);
+int (*arch_intr_init_quirk)(void);
+int (*arch_trap_init_quirk)(void);
+
 #ifdef CONFIG_HOTPLUG_CPU
 #define DEFAULT_SEND_IPI	(1)
 #else
@@ -29,6 +37,10 @@ int no_broadcast=DEFAULT_SEND_IPI;
  **/
 void __init pre_intr_init_hook(void)
 {
+	if (arch_pre_intr_init_quirk) {
+		if (arch_pre_intr_init_quirk())
+			return;
+	}
 	init_ISA_irqs();
 }
 
@@ -52,6 +64,10 @@ static struct irqaction irq2 = {
  **/
 void __init intr_init_hook(void)
 {
+	if (arch_intr_init_quirk) {
+		if (arch_intr_init_quirk())
+			return;
+	}
 #ifdef CONFIG_X86_LOCAL_APIC
 	apic_intr_init();
 #endif
@@ -81,6 +97,10 @@ void __init pre_setup_arch_hook(void)
  **/
 void __init trap_init_hook(void)
 {
+	if (arch_trap_init_quirk) {
+		if (arch_trap_init_quirk())
+			return;
+	}
 }
 
 static struct irqaction irq0  = {
@@ -99,6 +119,16 @@ static struct irqaction irq0  = {
  **/
 void __init time_init_hook(void)
 {
+	if (arch_time_init_quirk) {
+		/*
+		 * A nonzero return code does not mean failure, it means
+		 * that the architecture quirk does not want any
+		 * generic (timer) setup to be performed after this:
+		 */
+		if (arch_time_init_quirk())
+			return;
+	}
+
 	irq0.mask = cpumask_of_cpu(0);
 	setup_irq(0, &irq0);
 }

arch/x86/mach-visws/setup_visws.c

@@ -0,0 +1,233 @@
+/*
+ *  Unmaintained SGI Visual Workstation support.
+ *  Split out from setup.c by davej@suse.de
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+
+#include <asm/arch_hooks.h>
+#include <asm/fixmap.h>
+#include <asm/reboot.h>
+#include <asm/setup.h>
+#include <asm/e820.h>
+#include <asm/io.h>
+
+#include <mach_ipi.h>
+
+#include "cobalt.h"
+#include "piix4.h"
+
+char visws_board_type	= -1;
+char visws_board_rev	= -1;
+
+static int __init visws_time_init_quirk(void)
+{
+	printk(KERN_INFO "Starting Cobalt Timer system clock\n");
+
+	/* Set the countdown value */
+	co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
+
+	/* Start the timer */
+	co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
+
+	/* Enable (unmask) the timer interrupt */
+	co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
+
+	/*
+	 * Zero return means the generic timer setup code will set up
+	 * the standard vector:
+	 */
+	return 0;
+}
+
+static int __init visws_pre_intr_init_quirk(void)
+{
+	init_VISWS_APIC_irqs();
+
+	/*
+	 * We dont want ISA irqs to be set up by the generic code:
+	 */
+	return 1;
+}
+
+/* Quirk for machine specific memory setup. */
+
+#define MB (1024 * 1024)
+
+unsigned long sgivwfb_mem_phys;
+unsigned long sgivwfb_mem_size;
+EXPORT_SYMBOL(sgivwfb_mem_phys);
+EXPORT_SYMBOL(sgivwfb_mem_size);
+
+long long mem_size __initdata = 0;
+
+static char * __init visws_memory_setup_quirk(void)
+{
+	long long gfx_mem_size = 8 * MB;
+
+	mem_size = boot_params.alt_mem_k;
+
+	if (!mem_size) {
+		printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
+		mem_size = 128 * MB;
+	}
+
+	/*
+	 * this hardcodes the graphics memory to 8 MB
+	 * it really should be sized dynamically (or at least
+	 * set as a boot param)
+	 */
+	if (!sgivwfb_mem_size) {
+		printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
+		sgivwfb_mem_size = 8 * MB;
+	}
+
+	/*
+	 * Trim to nearest MB
+	 */
+	sgivwfb_mem_size &= ~((1 << 20) - 1);
+	sgivwfb_mem_phys = mem_size - gfx_mem_size;
+
+	e820_add_region(0, LOWMEMSIZE(), E820_RAM);
+	e820_add_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
+	e820_add_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
+
+	return "PROM";
+}
+
+static void visws_machine_emergency_restart(void)
+{
+	/*
+	 * Visual Workstations restart after this
+	 * register is poked on the PIIX4
+	 */
+	outb(PIIX4_RESET_VAL, PIIX4_RESET_PORT);
+}
+
+static void visws_machine_power_off(void)
+{
+	unsigned short pm_status;
+/*	extern unsigned int pci_bus0; */
+
+	while ((pm_status = inw(PMSTS_PORT)) & 0x100)
+		outw(pm_status, PMSTS_PORT);
+
+	outw(PM_SUSPEND_ENABLE, PMCNTRL_PORT);
+
+	mdelay(10);
+
+#define PCI_CONF1_ADDRESS(bus, devfn, reg) \
+	(0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
+
+/*	outl(PCI_CONF1_ADDRESS(pci_bus0, SPECIAL_DEV, SPECIAL_REG), 0xCF8); */
+	outl(PIIX_SPECIAL_STOP, 0xCFC);
+}
+
+extern int visws_trap_init_quirk(void);
+
+void __init visws_early_detect(void)
+{
+	int raw;
+
+	visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
+							 >> PIIX_GPI_BD_SHIFT;
+
+	if (visws_board_type < 0)
+		return;
+
+	/*
+	 * Install special quirks for timer, interrupt and memory setup:
+	 */
+	arch_time_init_quirk = visws_time_init_quirk;
+	arch_pre_intr_init_quirk = visws_pre_intr_init_quirk;
+	arch_memory_setup_quirk = visws_memory_setup_quirk;
+
+	/*
+	 * Fall back to generic behavior for traps:
+	 */
+	arch_intr_init_quirk = NULL;
+	arch_trap_init_quirk = visws_trap_init_quirk;
+
+	/*
+	 * Install reboot quirks:
+	 */
+	pm_power_off = visws_machine_power_off;
+	machine_ops.emergency_restart = visws_machine_emergency_restart;
+
+	/*
+	 * Do not use broadcast IPIs:
+	 */
+	no_broadcast = 0;
+
+	/*
+	 * Get Board rev.
+	 * First, we have to initialize the 307 part to allow us access
+	 * to the GPIO registers.  Let's map them at 0x0fc0 which is right
+	 * after the PIIX4 PM section.
+	 */
+	outb_p(SIO_DEV_SEL, SIO_INDEX);
+	outb_p(SIO_GP_DEV, SIO_DATA);	/* Talk to GPIO regs. */
+
+	outb_p(SIO_DEV_MSB, SIO_INDEX);
+	outb_p(SIO_GP_MSB, SIO_DATA);	/* MSB of GPIO base address */
+
+	outb_p(SIO_DEV_LSB, SIO_INDEX);
+	outb_p(SIO_GP_LSB, SIO_DATA);	/* LSB of GPIO base address */
+
+	outb_p(SIO_DEV_ENB, SIO_INDEX);
+	outb_p(1, SIO_DATA);		/* Enable GPIO registers. */
+
+	/*
+	 * Now, we have to map the power management section to write
+	 * a bit which enables access to the GPIO registers.
+	 * What lunatic came up with this shit?
+	 */
+	outb_p(SIO_DEV_SEL, SIO_INDEX);
+	outb_p(SIO_PM_DEV, SIO_DATA);	/* Talk to GPIO regs. */
+
+	outb_p(SIO_DEV_MSB, SIO_INDEX);
+	outb_p(SIO_PM_MSB, SIO_DATA);	/* MSB of PM base address */
+
+	outb_p(SIO_DEV_LSB, SIO_INDEX);
+	outb_p(SIO_PM_LSB, SIO_DATA);	/* LSB of PM base address */
+
+	outb_p(SIO_DEV_ENB, SIO_INDEX);
+	outb_p(1, SIO_DATA);		/* Enable PM registers. */
+
+	/*
+	 * Now, write the PM register which enables the GPIO registers.
+	 */
+	outb_p(SIO_PM_FER2, SIO_PM_INDEX);
+	outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
+
+	/*
+	 * Now, initialize the GPIO registers.
+	 * We want them all to be inputs which is the
+	 * power on default, so let's leave them alone.
+	 * So, let's just read the board rev!
+	 */
+	raw = inb_p(SIO_GP_DATA1);
+	raw &= 0x7f;	/* 7 bits of valid board revision ID. */
+
+	if (visws_board_type == VISWS_320) {
+		if (raw < 0x6) {
+			visws_board_rev = 4;
+		} else if (raw < 0xc) {
+			visws_board_rev = 5;
+		} else {
+			visws_board_rev = 6;
+		}
+	} else if (visws_board_type == VISWS_540) {
+			visws_board_rev = 2;
+		} else {
+			visws_board_rev = raw;
+		}
+
+	printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
+	       (visws_board_type == VISWS_320 ? "320" :
+	       (visws_board_type == VISWS_540 ? "540" :
+		"unknown")), visws_board_rev);
+}

arch/x86/mach-visws/traps.c

@@ -62,8 +62,10 @@ static __init void cobalt_init(void)
 		co_apic_read(CO_APIC_ID));
 }
 
-void __init trap_init_hook_dontuse(void)
+int __init visws_trap_init_quirk(void)
 {
 	lithium_init();
 	cobalt_init();
+
+	return 1;
 }

arch/x86/mach-visws/visws_apic.c

@@ -25,9 +25,6 @@
 
 #include "cobalt.h"
 
-char visws_board_type = -1;
-char visws_board_rev = -1;
-
 static DEFINE_SPINLOCK(cobalt_lock);
 
 /*