arch/x86/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 #include <linux/module.h>
  10
  11 #include <asm/fixmap.h>
  12 #include <asm/arch_hooks.h>
  13 #include <asm/io.h>
  14 #include <asm/e820.h>
  15 #include <asm/setup.h>
  16 #include "cobalt.h"
  17 #include "piix4.h"
  18
  19 int no_broadcast;
  20
  21 char visws_board_type = -1;
  22 char visws_board_rev = -1;
  23
  24 void __init visws_get_board_type_and_rev(void)
  25 {
  26         int raw;
  27
  28         visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
  29                                                          >> PIIX_GPI_BD_SHIFT;
  30         /*
  31          * Get Board rev.
  32          * First, we have to initialize the 307 part to allow us access
  33          * to the GPIO registers.  Let's map them at 0x0fc0 which is right
  34          * after the PIIX4 PM section.
  35          */
  36         outb_p(SIO_DEV_SEL, SIO_INDEX);
  37         outb_p(SIO_GP_DEV, SIO_DATA);   /* Talk to GPIO regs. */
  38
  39         outb_p(SIO_DEV_MSB, SIO_INDEX);
  40         outb_p(SIO_GP_MSB, SIO_DATA);   /* MSB of GPIO base address */
  41
  42         outb_p(SIO_DEV_LSB, SIO_INDEX);
  43         outb_p(SIO_GP_LSB, SIO_DATA);   /* LSB of GPIO base address */
  44
  45         outb_p(SIO_DEV_ENB, SIO_INDEX);
  46         outb_p(1, SIO_DATA);            /* Enable GPIO registers. */
  47
  48         /*
  49          * Now, we have to map the power management section to write
  50          * a bit which enables access to the GPIO registers.
  51          * What lunatic came up with this shit?
  52          */
  53         outb_p(SIO_DEV_SEL, SIO_INDEX);
  54         outb_p(SIO_PM_DEV, SIO_DATA);   /* Talk to GPIO regs. */
  55
  56         outb_p(SIO_DEV_MSB, SIO_INDEX);
  57         outb_p(SIO_PM_MSB, SIO_DATA);   /* MSB of PM base address */
  58
  59         outb_p(SIO_DEV_LSB, SIO_INDEX);
  60         outb_p(SIO_PM_LSB, SIO_DATA);   /* LSB of PM base address */
  61
  62         outb_p(SIO_DEV_ENB, SIO_INDEX);
  63         outb_p(1, SIO_DATA);            /* Enable PM registers. */
  64
  65         /*
  66          * Now, write the PM register which enables the GPIO registers.
  67          */
  68         outb_p(SIO_PM_FER2, SIO_PM_INDEX);
  69         outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
  70
  71         /*
  72          * Now, initialize the GPIO registers.
  73          * We want them all to be inputs which is the
  74          * power on default, so let's leave them alone.
  75          * So, let's just read the board rev!
  76          */
  77         raw = inb_p(SIO_GP_DATA1);
  78         raw &= 0x7f;    /* 7 bits of valid board revision ID. */
  79
  80         if (visws_board_type == VISWS_320) {
  81                 if (raw < 0x6) {
  82                         visws_board_rev = 4;
  83                 } else if (raw < 0xc) {
  84                         visws_board_rev = 5;
  85                 } else {
  86                         visws_board_rev = 6;
  87                 }
  88         } else if (visws_board_type == VISWS_540) {
  89                         visws_board_rev = 2;
  90                 } else {
  91                         visws_board_rev = raw;
  92                 }
  93
  94         printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
  95                (visws_board_type == VISWS_320 ? "320" :
  96                (visws_board_type == VISWS_540 ? "540" :
  97                 "unknown")), visws_board_rev);
  98 }
  99
 100 void __init pre_intr_init_hook(void)
 101 {
 102         init_VISWS_APIC_irqs();
 103 }
 104
 105 void __init intr_init_hook(void)
 106 {
 107 #ifdef CONFIG_X86_LOCAL_APIC
 108         apic_intr_init();
 109 #endif
 110 }
 111
 112 void __init pre_setup_arch_hook()
 113 {
 114         visws_get_board_type_and_rev();
 115 }
 116
 117 static struct irqaction irq0 = {
 118         .handler =      timer_interrupt,
 119         .flags =        IRQF_DISABLED | IRQF_IRQPOLL,
 120         .name =         "timer",
 121 };
 122
 123 void __init time_init_hook(void)
 124 {
 125         printk(KERN_INFO "Starting Cobalt Timer system clock\n");
 126
 127         /* Set the countdown value */
 128         co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
 129
 130         /* Start the timer */
 131         co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
 132
 133         /* Enable (unmask) the timer interrupt */
 134         co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
 135
 136         /* Wire cpu IDT entry to s/w handler (and Cobalt APIC to IDT) */
 137         setup_irq(0, &irq0);
 138 }
 139
 140 /* Hook for machine specific memory setup. */
 141
 142 #define MB (1024 * 1024)
 143
 144 unsigned long sgivwfb_mem_phys;
 145 unsigned long sgivwfb_mem_size;
 146 EXPORT_SYMBOL(sgivwfb_mem_phys);
 147 EXPORT_SYMBOL(sgivwfb_mem_size);
 148
 149 long long mem_size __initdata = 0;
 150
 151 char * __init machine_specific_memory_setup(void)
 152 {
 153         long long gfx_mem_size = 8 * MB;
 154
 155         mem_size = boot_params.alt_mem_k;
 156
 157         if (!mem_size) {
 158                 printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
 159                 mem_size = 128 * MB;
 160         }
 161
 162         /*
 163          * this hardcodes the graphics memory to 8 MB
 164          * it really should be sized dynamically (or at least
 165          * set as a boot param)
 166          */
 167         if (!sgivwfb_mem_size) {
 168                 printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
 169                 sgivwfb_mem_size = 8 * MB;
 170         }
 171
 172         /*
 173          * Trim to nearest MB
 174          */
 175         sgivwfb_mem_size &= ~((1 << 20) - 1);
 176         sgivwfb_mem_phys = mem_size - gfx_mem_size;
 177
 178         add_memory_region(0, LOWMEMSIZE(), E820_RAM);
 179         add_memory_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
 180         add_memory_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
 181
 182         return "PROM";
 183 }