cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ip22-eisa.c (3389B)

      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
     51static char __init *decode_eisa_sig(unsigned long addr)
     52{
     53	static char sig_str[EISA_SIG_LEN] __initdata;
     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
     74static irqreturn_t ip22_eisa_intr(int irq, void *dev_id)
     75{
     76	u8 eisa_irq = inb(EIU_INTRPT_ACK);
     77
     78	inb(EISA_DMA1_STATUS);
     79	inb(EISA_DMA2_STATUS);
     80
     81	if (eisa_irq < EISA_MAX_IRQ) {
     82		do_IRQ(eisa_irq);
     83		return IRQ_HANDLED;
     84	}
     85
     86	/* Oops, Bad Stuff Happened... */
     87	printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq);
     88
     89	outb(0x20, EISA_INT2_CTRL);
     90	outb(0x20, EISA_INT1_CTRL);
     91
     92	return IRQ_NONE;
     93}
     94
     95int __init ip22_eisa_init(void)
     96{
     97	int i, c;
     98	char *str;
     99
    100	if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) {
    101		printk(KERN_INFO "EISA: bus not present.\n");
    102		return 1;
    103	}
    104
    105	printk(KERN_INFO "EISA: Probing bus...\n");
    106	for (c = 0, i = 1; i <= IP22_EISA_MAX_SLOTS; i++) {
    107		if ((str = decode_eisa_sig(0x1000 * i + EISA_VENDOR_ID_OFFSET))) {
    108			printk(KERN_INFO "EISA: slot %d : %s detected.\n",
    109			       i, str);
    110			c++;
    111		}
    112	}
    113	printk(KERN_INFO "EISA: Detected %d card%s.\n", c, c < 2 ? "" : "s");
    114#ifdef CONFIG_ISA
    115	printk(KERN_INFO "ISA support compiled in.\n");
    116#endif
    117
    118	/* Warning : BlackMagicAhead(tm).
    119	   Please wave your favorite dead chicken over the busses */
    120
    121	/* First say hello to the EIU */
    122	outl(0x0000FFFF, EIU_PREMPT_REG);
    123	outl(1, EIU_QUIET_REG);
    124	outl(0x40f3c07F, EIU_MODE_REG);
    125
    126	/* Now be nice to the EISA chipset */
    127	outb(1, EISA_EXT_NMI_RESET_CTRL);
    128	udelay(50);	/* Wait long enough for the dust to settle */
    129	outb(0, EISA_EXT_NMI_RESET_CTRL);
    130	outb(0, EISA_DMA2_WRITE_SINGLE);
    131
    132	init_i8259_irqs();
    133
    134	if (request_irq(SGI_EISA_IRQ, ip22_eisa_intr, 0, "EISA", NULL))
    135		pr_err("Failed to request irq %d (EISA)\n", SGI_EISA_IRQ);
    136
    137	EISA_bus = 1;
    138	return 0;
    139}