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139 lines
3.3 KiB
139 lines
3.3 KiB
/* |
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* Basic EISA bus support for the SGI Indigo-2. |
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* |
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* (C) 2002 Pascal Dameme <[email protected]> |
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* and Marc Zyngier <[email protected]> |
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* |
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* This code is released under both the GPL version 2 and BSD |
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* licenses. Either license may be used. |
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* |
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* This code offers a very basic support for this EISA bus present in |
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* the SGI Indigo-2. It currently only supports PIO (forget about DMA |
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* for the time being). This is enough for a low-end ethernet card, |
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* but forget about your favorite SCSI card... |
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* |
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* TODO : |
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* - Fix bugs... |
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* - Add ISA support |
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* - Add DMA (yeah, right...). |
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* - Fix more bugs. |
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*/ |
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#include <linux/eisa.h> |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/irq.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/interrupt.h> |
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#include <linux/delay.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#include <asm/mipsregs.h> |
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#include <asm/addrspace.h> |
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#include <asm/processor.h> |
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#include <asm/sgi/ioc.h> |
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#include <asm/sgi/mc.h> |
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#include <asm/sgi/ip22.h> |
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#include <asm/i8259.h> |
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/* I2 has four EISA slots. */ |
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#define IP22_EISA_MAX_SLOTS 4 |
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#define EISA_MAX_IRQ 16 |
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#define EIU_MODE_REG 0x0001ffc0 |
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#define EIU_STAT_REG 0x0001ffc4 |
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#define EIU_PREMPT_REG 0x0001ffc8 |
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#define EIU_QUIET_REG 0x0001ffcc |
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#define EIU_INTRPT_ACK 0x00010004 |
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static char __init *decode_eisa_sig(unsigned long addr) |
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{ |
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static char sig_str[EISA_SIG_LEN] __initdata; |
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u8 sig[4]; |
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u16 rev; |
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int i; |
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for (i = 0; i < 4; i++) { |
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sig[i] = inb(addr + i); |
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if (!i && (sig[0] & 0x80)) |
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return NULL; |
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} |
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sig_str[0] = ((sig[0] >> 2) & 0x1f) + ('A' - 1); |
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sig_str[1] = (((sig[0] & 3) << 3) | (sig[1] >> 5)) + ('A' - 1); |
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sig_str[2] = (sig[1] & 0x1f) + ('A' - 1); |
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rev = (sig[2] << 8) | sig[3]; |
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sprintf(sig_str + 3, "%04X", rev); |
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return sig_str; |
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} |
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static irqreturn_t ip22_eisa_intr(int irq, void *dev_id) |
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{ |
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u8 eisa_irq = inb(EIU_INTRPT_ACK); |
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inb(EISA_DMA1_STATUS); |
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inb(EISA_DMA2_STATUS); |
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if (eisa_irq < EISA_MAX_IRQ) { |
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do_IRQ(eisa_irq); |
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return IRQ_HANDLED; |
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} |
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/* Oops, Bad Stuff Happened... */ |
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printk(KERN_ERR "eisa_irq %d out of bound\n", eisa_irq); |
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outb(0x20, EISA_INT2_CTRL); |
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outb(0x20, EISA_INT1_CTRL); |
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return IRQ_NONE; |
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} |
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int __init ip22_eisa_init(void) |
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{ |
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int i, c; |
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char *str; |
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if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) { |
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printk(KERN_INFO "EISA: bus not present.\n"); |
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return 1; |
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} |
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printk(KERN_INFO "EISA: Probing bus...\n"); |
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for (c = 0, i = 1; i <= IP22_EISA_MAX_SLOTS; i++) { |
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if ((str = decode_eisa_sig(0x1000 * i + EISA_VENDOR_ID_OFFSET))) { |
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printk(KERN_INFO "EISA: slot %d : %s detected.\n", |
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i, str); |
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c++; |
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} |
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} |
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printk(KERN_INFO "EISA: Detected %d card%s.\n", c, c < 2 ? "" : "s"); |
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#ifdef CONFIG_ISA |
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printk(KERN_INFO "ISA support compiled in.\n"); |
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#endif |
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/* Warning : BlackMagicAhead(tm). |
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Please wave your favorite dead chicken over the busses */ |
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/* First say hello to the EIU */ |
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outl(0x0000FFFF, EIU_PREMPT_REG); |
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outl(1, EIU_QUIET_REG); |
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outl(0x40f3c07F, EIU_MODE_REG); |
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/* Now be nice to the EISA chipset */ |
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outb(1, EISA_EXT_NMI_RESET_CTRL); |
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udelay(50); /* Wait long enough for the dust to settle */ |
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outb(0, EISA_EXT_NMI_RESET_CTRL); |
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outb(0, EISA_DMA2_WRITE_SINGLE); |
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init_i8259_irqs(); |
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if (request_irq(SGI_EISA_IRQ, ip22_eisa_intr, 0, "EISA", NULL)) |
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pr_err("Failed to request irq %d (EISA)\n", SGI_EISA_IRQ); |
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EISA_bus = 1; |
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return 0; |
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}
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