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Linux/arch/mips/sgi-ip22/ip22-eisa.c

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  1 /*
  2  * Basic EISA bus support for the SGI Indigo-2.
  3  *
  4  * (C) 2002 Pascal Dameme <netinet@freesurf.fr>
  5  *      and Marc Zyngier <mzyngier@freesurf.fr>
  6  *
  7  * This code is released under both the GPL version 2 and BSD
  8  * licenses.  Either license may be used.
  9  *
 10  * This code offers a very basic support for this EISA bus present in
 11  * the SGI Indigo-2. It currently only supports PIO (forget about DMA
 12  * for the time being). This is enough for a low-end ethernet card,
 13  * but forget about your favorite SCSI card...
 14  *
 15  * TODO :
 16  * - Fix bugs...
 17  * - Add ISA support
 18  * - Add DMA (yeah, right...).
 19  * - Fix more bugs.
 20  */
 21 
 22 #include <linux/eisa.h>
 23 #include <linux/types.h>
 24 #include <linux/init.h>
 25 #include <linux/irq.h>
 26 #include <linux/kernel_stat.h>
 27 #include <linux/signal.h>
 28 #include <linux/sched.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/delay.h>
 31 #include <asm/io.h>
 32 #include <asm/irq.h>
 33 #include <asm/mipsregs.h>
 34 #include <asm/addrspace.h>
 35 #include <asm/processor.h>
 36 #include <asm/sgi/ioc.h>
 37 #include <asm/sgi/mc.h>
 38 #include <asm/sgi/ip22.h>
 39 #include <asm/i8259.h>
 40 
 41 /* I2 has four EISA slots. */
 42 #define IP22_EISA_MAX_SLOTS       4
 43 #define EISA_MAX_IRQ             16
 44 
 45 #define EIU_MODE_REG     0x0001ffc0
 46 #define EIU_STAT_REG     0x0001ffc4
 47 #define EIU_PREMPT_REG   0x0001ffc8
 48 #define EIU_QUIET_REG    0x0001ffcc
 49 #define EIU_INTRPT_ACK   0x00010004
 50 
 51 static char __init *decode_eisa_sig(unsigned long addr)
 52 {
 53         static char sig_str[EISA_SIG_LEN];
 54         u8 sig[4];
 55         u16 rev;
 56         int i;
 57 
 58         for (i = 0; i < 4; i++) {
 59                 sig[i] = inb(addr + i);
 60 
 61                 if (!i && (sig[0] & 0x80))
 62                         return NULL;
 63         }
 64 
 65         sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1);
 66         sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1);
 67         sig_str[2] = (sig[1] & 0x1f) + ('A' - 1);
 68         rev = (sig[2] << 8) | sig[3];
 69         sprintf(sig_str + 3, "%04X", rev);
 70 
 71         return sig_str;
 72 }
 73 
 74 static irqreturn_t ip22_eisa_intr(int irq, void *dev_id)
 75 {
 76         u8 eisa_irq;
 77         u8 dma1, dma2;
 78 
 79         eisa_irq = inb(EIU_INTRPT_ACK);
 80         dma1 = inb(EISA_DMA1_STATUS);
 81         dma2 = inb(EISA_DMA2_STATUS);
 82 
 83         if (eisa_irq < EISA_MAX_IRQ) {
 84                 do_IRQ(eisa_irq);
 85                 return IRQ_HANDLED;
 86         }
 87 
 88         /* Oops, Bad Stuff Happened... */
 89         printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq);
 90 
 91         outb(0x20, EISA_INT2_CTRL);
 92         outb(0x20, EISA_INT1_CTRL);
 93 
 94         return IRQ_NONE;
 95 }
 96 
 97 static struct irqaction eisa_action = {
 98         .handler        = ip22_eisa_intr,
 99         .name           = "EISA",
100 };
101 
102 int __init ip22_eisa_init(void)
103 {
104         int i, c;
105         char *str;
106 
107         if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) {
108                 printk(KERN_INFO "EISA: bus not present.\n");
109                 return 1;
110         }
111 
112         printk(KERN_INFO "EISA: Probing bus...\n");
113         for (c = 0, i = 1; i <= IP22_EISA_MAX_SLOTS; i++) {
114                 if ((str = decode_eisa_sig(0x1000 * i + EISA_VENDOR_ID_OFFSET))) {
115                         printk(KERN_INFO "EISA: slot %d : %s detected.\n",
116                                i, str);
117                         c++;
118                 }
119         }
120         printk(KERN_INFO "EISA: Detected %d card%s.\n", c, c < 2 ? "" : "s");
121 #ifdef CONFIG_ISA
122         printk(KERN_INFO "ISA support compiled in.\n");
123 #endif
124 
125         /* Warning : BlackMagicAhead(tm).
126            Please wave your favorite dead chicken over the busses */
127 
128         /* First say hello to the EIU */
129         outl(0x0000FFFF, EIU_PREMPT_REG);
130         outl(1, EIU_QUIET_REG);
131         outl(0x40f3c07F, EIU_MODE_REG);
132 
133         /* Now be nice to the EISA chipset */
134         outb(1, EISA_EXT_NMI_RESET_CTRL);
135         udelay(50);     /* Wait long enough for the dust to settle */
136         outb(0, EISA_EXT_NMI_RESET_CTRL);
137         outb(0, EISA_DMA2_WRITE_SINGLE);
138 
139         init_i8259_irqs();
140 
141         /* Cannot use request_irq because of kmalloc not being ready at such
142          * an early stage. Yes, I've been bitten... */
143         setup_irq(SGI_EISA_IRQ, &eisa_action);
144 
145         EISA_bus = 1;
146         return 0;
147 }
148 

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