arch/i386/mach-visws/setup.c

   1 /*
   2  *  Unmaintained SGI Visual Workstation support.
   3  *  Split out from setup.c by davej@suse.de
   4  */
   5
   6 #include <linux/smp.h>
   7 #include <linux/init.h>
   8 #include <linux/interrupt.h>
   9
  10 #include <asm/fixmap.h>
  11 #include <asm/arch_hooks.h>
  12 #include <asm/io.h>
  13 #include <asm/e820.h>
  14 #include <asm/setup.h>
  15 #include "cobalt.h"
  16 #include "piix4.h"
  17
  18 int no_broadcast;
  19
  20 char visws_board_type = -1;
  21 char visws_board_rev = -1;
  22
  23 void __init visws_get_board_type_and_rev(void)
  24 {
  25         int raw;
  26
  27         visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
  28                                                          >> PIIX_GPI_BD_SHIFT;
  29         /*
  30          * Get Board rev.
  31          * First, we have to initialize the 307 part to allow us access
  32          * to the GPIO registers.  Let's map them at 0x0fc0 which is right
  33          * after the PIIX4 PM section.
  34          */
  35         outb_p(SIO_DEV_SEL, SIO_INDEX);
  36         outb_p(SIO_GP_DEV, SIO_DATA);   /* Talk to GPIO regs. */
  37
  38         outb_p(SIO_DEV_MSB, SIO_INDEX);
  39         outb_p(SIO_GP_MSB, SIO_DATA);   /* MSB of GPIO base address */
  40
  41         outb_p(SIO_DEV_LSB, SIO_INDEX);
  42         outb_p(SIO_GP_LSB, SIO_DATA);   /* LSB of GPIO base address */
  43
  44         outb_p(SIO_DEV_ENB, SIO_INDEX);
  45         outb_p(1, SIO_DATA);            /* Enable GPIO registers. */
  46
  47         /*
  48          * Now, we have to map the power management section to write
  49          * a bit which enables access to the GPIO registers.
  50          * What lunatic came up with this shit?
  51          */
  52         outb_p(SIO_DEV_SEL, SIO_INDEX);
  53         outb_p(SIO_PM_DEV, SIO_DATA);   /* Talk to GPIO regs. */
  54
  55         outb_p(SIO_DEV_MSB, SIO_INDEX);
  56         outb_p(SIO_PM_MSB, SIO_DATA);   /* MSB of PM base address */
  57
  58         outb_p(SIO_DEV_LSB, SIO_INDEX);
  59         outb_p(SIO_PM_LSB, SIO_DATA);   /* LSB of PM base address */
  60
  61         outb_p(SIO_DEV_ENB, SIO_INDEX);
  62         outb_p(1, SIO_DATA);            /* Enable PM registers. */
  63
  64         /*
  65          * Now, write the PM register which enables the GPIO registers.
  66          */
  67         outb_p(SIO_PM_FER2, SIO_PM_INDEX);
  68         outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
  69
  70         /*
  71          * Now, initialize the GPIO registers.
  72          * We want them all to be inputs which is the
  73          * power on default, so let's leave them alone.
  74          * So, let's just read the board rev!
  75          */
  76         raw = inb_p(SIO_GP_DATA1);
  77         raw &= 0x7f;    /* 7 bits of valid board revision ID. */
  78
  79         if (visws_board_type == VISWS_320) {
  80                 if (raw < 0x6) {
  81                         visws_board_rev = 4;
  82                 } else if (raw < 0xc) {
  83                         visws_board_rev = 5;
  84                 } else {
  85                         visws_board_rev = 6;
  86                 }
  87         } else if (visws_board_type == VISWS_540) {
  88                         visws_board_rev = 2;
  89                 } else {
  90                         visws_board_rev = raw;
  91                 }
  92
  93         printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
  94                (visws_board_type == VISWS_320 ? "320" :
  95                (visws_board_type == VISWS_540 ? "540" :
  96                 "unknown")), visws_board_rev);
  97 }
  98
  99 void __init pre_intr_init_hook(void)
 100 {
 101         init_VISWS_APIC_irqs();
 102 }
 103
 104 void __init intr_init_hook(void)
 105 {
 106 #ifdef CONFIG_X86_LOCAL_APIC
 107         apic_intr_init();
 108 #endif
 109 }
 110
 111 void __init pre_setup_arch_hook()
 112 {
 113         visws_get_board_type_and_rev();
 114 }
 115
 116 static struct irqaction irq0 = {
 117         .handler =      timer_interrupt,
 118         .flags =        SA_INTERRUPT,
 119         .name =         "timer",
 120 };
 121
 122 void __init time_init_hook(void)
 123 {
 124         printk(KERN_INFO "Starting Cobalt Timer system clock\n");
 125
 126         /* Set the countdown value */
 127         co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
 128
 129         /* Start the timer */
 130         co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
 131
 132         /* Enable (unmask) the timer interrupt */
 133         co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
 134
 135         /* Wire cpu IDT entry to s/w handler (and Cobalt APIC to IDT) */
 136         setup_irq(0, &irq0);
 137 }
 138
 139 /* Hook for machine specific memory setup. */
 140
 141 #define MB (1024 * 1024)
 142
 143 unsigned long sgivwfb_mem_phys;
 144 unsigned long sgivwfb_mem_size;
 145
 146 long long mem_size __initdata = 0;
 147
 148 char * __init machine_specific_memory_setup(void)
 149 {
 150         long long gfx_mem_size = 8 * MB;
 151
 152         mem_size = ALT_MEM_K;
 153
 154         if (!mem_size) {
 155                 printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
 156                 mem_size = 128 * MB;
 157         }
 158
 159         /*
 160          * this hardcodes the graphics memory to 8 MB
 161          * it really should be sized dynamically (or at least
 162          * set as a boot param)
 163          */
 164         if (!sgivwfb_mem_size) {
 165                 printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
 166                 sgivwfb_mem_size = 8 * MB;
 167         }
 168
 169         /*
 170          * Trim to nearest MB
 171          */
 172         sgivwfb_mem_size &= ~((1 << 20) - 1);
 173         sgivwfb_mem_phys = mem_size - gfx_mem_size;
 174
 175         add_memory_region(0, LOWMEMSIZE(), E820_RAM);
 176         add_memory_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
 177         add_memory_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
 178
 179         return "PROM";
 180 }