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/*
* Unmaintained SGI Visual Workstation support.
* Split out from setup.c by davej@suse.de
*/
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/fixmap.h>
#include <asm/arch_hooks.h>
#include <asm/io.h>
#include <asm/e820.h>
#include <asm/setup.h>
#include "cobalt.h"
#include "piix4.h"
int no_broadcast;
char visws_board_type = -1;
char visws_board_rev = -1;
void __init visws_get_board_type_and_rev(void)
{
int raw;
visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
>> PIIX_GPI_BD_SHIFT;
/*
* 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);
}
void __init pre_intr_init_hook(void)
{
init_VISWS_APIC_irqs();
}
void __init intr_init_hook(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
apic_intr_init();
#endif
}
void __init pre_setup_arch_hook()
{
visws_get_board_type_and_rev();
}
static struct irqaction irq0 = {
.handler = timer_interrupt,
.flags = IRQF_DISABLED,
.name = "timer",
};
void __init time_init_hook(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);
/* Wire cpu IDT entry to s/w handler (and Cobalt APIC to IDT) */
setup_irq(0, &irq0);
}
/* Hook for machine specific memory setup. */
#define MB (1024 * 1024)
unsigned long sgivwfb_mem_phys;
unsigned long sgivwfb_mem_size;
long long mem_size __initdata = 0;
char * __init machine_specific_memory_setup(void)
{
long long gfx_mem_size = 8 * MB;
mem_size = 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;
add_memory_region(0, LOWMEMSIZE(), E820_RAM);
add_memory_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
add_memory_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
return "PROM";
}
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