378 lines
9.2 KiB
C
Executable File
378 lines
9.2 KiB
C
Executable File
/* -*- mode: c; c-basic-offset: 8 -*- */
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/* NCR Quad 720 MCA SCSI Driver
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*
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* Copyright (C) 2003 by James.Bottomley@HansenPartnership.com
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*/
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#include <linux/blkdev.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mca.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include "ncr53c8xx.h"
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#include "NCR_Q720.h"
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static struct ncr_chip q720_chip __initdata = {
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.revision_id = 0x0f,
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.burst_max = 3,
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.offset_max = 8,
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.nr_divisor = 4,
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.features = FE_WIDE | FE_DIFF | FE_VARCLK,
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};
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MODULE_AUTHOR("James Bottomley");
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MODULE_DESCRIPTION("NCR Quad 720 SCSI Driver");
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MODULE_LICENSE("GPL");
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#define NCR_Q720_VERSION "0.9"
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/* We needs this helper because we have up to four hosts per struct device */
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struct NCR_Q720_private {
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struct device *dev;
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void __iomem * mem_base;
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__u32 phys_mem_base;
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__u32 mem_size;
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__u8 irq;
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__u8 siops;
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__u8 irq_enable;
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struct Scsi_Host *hosts[4];
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};
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static struct scsi_host_template NCR_Q720_tpnt = {
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.module = THIS_MODULE,
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.proc_name = "NCR_Q720",
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};
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static irqreturn_t
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NCR_Q720_intr(int irq, void *data)
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{
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struct NCR_Q720_private *p = (struct NCR_Q720_private *)data;
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__u8 sir = (readb(p->mem_base + 0x0d) & 0xf0) >> 4;
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__u8 siop;
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sir |= ~p->irq_enable;
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if(sir == 0xff)
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return IRQ_NONE;
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while((siop = ffz(sir)) < p->siops) {
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sir |= 1<<siop;
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ncr53c8xx_intr(irq, p->hosts[siop]);
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}
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return IRQ_HANDLED;
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}
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static int __init
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NCR_Q720_probe_one(struct NCR_Q720_private *p, int siop,
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int irq, int slot, __u32 paddr, void __iomem *vaddr)
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{
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struct ncr_device device;
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__u8 scsi_id;
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static int unit = 0;
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__u8 scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
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__u8 differential = readb(vaddr + NCR_Q720_SCSR_OFFSET) & 0x20;
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__u8 version;
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int error;
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scsi_id = scsr1 >> 4;
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/* enable burst length 16 (FIXME: should allow this) */
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scsr1 |= 0x02;
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/* force a siop reset */
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scsr1 |= 0x04;
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writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);
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udelay(10);
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version = readb(vaddr + 0x18) >> 4;
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memset(&device, 0, sizeof(struct ncr_device));
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/* Initialise ncr_device structure with items required by ncr_attach. */
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device.chip = q720_chip;
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device.chip.revision_id = version;
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device.host_id = scsi_id;
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device.dev = p->dev;
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device.slot.base = paddr;
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device.slot.base_c = paddr;
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device.slot.base_v = vaddr;
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device.slot.irq = irq;
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device.differential = differential ? 2 : 0;
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printk("Q720 probe unit %d (siop%d) at 0x%lx, diff = %d, vers = %d\n", unit, siop,
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(unsigned long)paddr, differential, version);
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p->hosts[siop] = ncr_attach(&NCR_Q720_tpnt, unit++, &device);
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if (!p->hosts[siop])
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goto fail;
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p->irq_enable |= (1<<siop);
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scsr1 = readb(vaddr + NCR_Q720_SCSR_OFFSET + 1);
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/* clear the disable interrupt bit */
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scsr1 &= ~0x01;
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writeb(scsr1, vaddr + NCR_Q720_SCSR_OFFSET + 1);
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error = scsi_add_host(p->hosts[siop], p->dev);
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if (error)
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ncr53c8xx_release(p->hosts[siop]);
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else
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scsi_scan_host(p->hosts[siop]);
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return error;
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fail:
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return -ENODEV;
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}
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/* Detect a Q720 card. Note, because of the setup --- the chips are
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* essentially connectecd to the MCA bus independently, it is easier
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* to set them up as two separate host adapters, rather than one
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* adapter with two channels */
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static int __init
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NCR_Q720_probe(struct device *dev)
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{
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struct NCR_Q720_private *p;
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static int banner = 1;
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struct mca_device *mca_dev = to_mca_device(dev);
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int slot = mca_dev->slot;
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int found = 0;
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int irq, i, siops;
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__u8 pos2, pos4, asr2, asr9, asr10;
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__u16 io_base;
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__u32 base_addr, mem_size;
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void __iomem *mem_base;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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pos2 = mca_device_read_pos(mca_dev, 2);
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/* enable device */
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pos2 |= NCR_Q720_POS2_BOARD_ENABLE | NCR_Q720_POS2_INTERRUPT_ENABLE;
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mca_device_write_pos(mca_dev, 2, pos2);
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io_base = (pos2 & NCR_Q720_POS2_IO_MASK) << NCR_Q720_POS2_IO_SHIFT;
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if(banner) {
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printk(KERN_NOTICE "NCR Q720: Driver Version " NCR_Q720_VERSION "\n"
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"NCR Q720: Copyright (c) 2003 by James.Bottomley@HansenPartnership.com\n"
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"NCR Q720:\n");
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banner = 0;
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}
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io_base = mca_device_transform_ioport(mca_dev, io_base);
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/* OK, this is phase one of the bootstrap, we now know the
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* I/O space base address. All the configuration registers
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* are mapped here (including pos) */
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/* sanity check I/O mapping */
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i = inb(io_base) | (inb(io_base+1)<<8);
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if(i != NCR_Q720_MCA_ID) {
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printk(KERN_ERR "NCR_Q720, adapter failed to I/O map registers correctly at 0x%x(0x%x)\n", io_base, i);
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kfree(p);
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return -ENODEV;
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}
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/* Phase II, find the ram base and memory map the board register */
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pos4 = inb(io_base + 4);
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/* enable streaming data */
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pos4 |= 0x01;
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outb(pos4, io_base + 4);
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base_addr = (pos4 & 0x7e) << 20;
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base_addr += (pos4 & 0x80) << 23;
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asr10 = inb(io_base + 0x12);
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base_addr += (asr10 & 0x80) << 24;
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base_addr += (asr10 & 0x70) << 23;
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/* OK, got the base addr, now we need to find the ram size,
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* enable and map it */
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asr9 = inb(io_base + 0x11);
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i = (asr9 & 0xc0) >> 6;
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if(i == 0)
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mem_size = 1024;
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else
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mem_size = 1 << (19 + i);
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/* enable the sram mapping */
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asr9 |= 0x20;
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/* disable the rom mapping */
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asr9 &= ~0x10;
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outb(asr9, io_base + 0x11);
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if(!request_mem_region(base_addr, mem_size, "NCR_Q720")) {
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printk(KERN_ERR "NCR_Q720: Failed to claim memory region 0x%lx\n-0x%lx",
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(unsigned long)base_addr,
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(unsigned long)(base_addr + mem_size));
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goto out_free;
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}
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if (dma_declare_coherent_memory(dev, base_addr, base_addr,
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mem_size, DMA_MEMORY_MAP)
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!= DMA_MEMORY_MAP) {
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printk(KERN_ERR "NCR_Q720: DMA declare memory failed\n");
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goto out_release_region;
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}
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/* The first 1k of the memory buffer is a memory map of the registers
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*/
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mem_base = dma_mark_declared_memory_occupied(dev, base_addr,
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1024);
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if (IS_ERR(mem_base)) {
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printk("NCR_Q720 failed to reserve memory mapped region\n");
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goto out_release;
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}
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/* now also enable accesses in asr 2 */
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asr2 = inb(io_base + 0x0a);
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asr2 |= 0x01;
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outb(asr2, io_base + 0x0a);
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/* get the number of SIOPs (this should be 2 or 4) */
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siops = ((asr2 & 0xe0) >> 5) + 1;
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/* sanity check mapping (again) */
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i = readw(mem_base);
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if(i != NCR_Q720_MCA_ID) {
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printk(KERN_ERR "NCR_Q720, adapter failed to memory map registers correctly at 0x%lx(0x%x)\n", (unsigned long)base_addr, i);
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goto out_release;
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}
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irq = readb(mem_base + 5) & 0x0f;
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/* now do the bus related transforms */
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irq = mca_device_transform_irq(mca_dev, irq);
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printk(KERN_NOTICE "NCR Q720: found in slot %d irq = %d mem base = 0x%lx siops = %d\n", slot, irq, (unsigned long)base_addr, siops);
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printk(KERN_NOTICE "NCR Q720: On board ram %dk\n", mem_size/1024);
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p->dev = dev;
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p->mem_base = mem_base;
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p->phys_mem_base = base_addr;
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p->mem_size = mem_size;
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p->irq = irq;
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p->siops = siops;
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if (request_irq(irq, NCR_Q720_intr, IRQF_SHARED, "NCR_Q720", p)) {
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printk(KERN_ERR "NCR_Q720: request irq %d failed\n", irq);
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goto out_release;
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}
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/* disable all the siop interrupts */
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for(i = 0; i < siops; i++) {
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void __iomem *reg_scsr1 = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
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+ i*NCR_Q720_SIOP_SHIFT + NCR_Q720_SCSR_OFFSET + 1;
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__u8 scsr1 = readb(reg_scsr1);
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scsr1 |= 0x01;
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writeb(scsr1, reg_scsr1);
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}
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/* plumb in all 720 chips */
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for (i = 0; i < siops; i++) {
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void __iomem *siop_v_base = mem_base + NCR_Q720_CHIP_REGISTER_OFFSET
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+ i*NCR_Q720_SIOP_SHIFT;
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__u32 siop_p_base = base_addr + NCR_Q720_CHIP_REGISTER_OFFSET
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+ i*NCR_Q720_SIOP_SHIFT;
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__u16 port = io_base + NCR_Q720_CHIP_REGISTER_OFFSET
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+ i*NCR_Q720_SIOP_SHIFT;
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int err;
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outb(0xff, port + 0x40);
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outb(0x07, port + 0x41);
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if ((err = NCR_Q720_probe_one(p, i, irq, slot,
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siop_p_base, siop_v_base)) != 0)
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printk("Q720: SIOP%d: probe failed, error = %d\n",
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i, err);
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else
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found++;
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}
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if (!found) {
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kfree(p);
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return -ENODEV;
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}
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mca_device_set_claim(mca_dev, 1);
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mca_device_set_name(mca_dev, "NCR_Q720");
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dev_set_drvdata(dev, p);
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return 0;
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out_release:
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dma_release_declared_memory(dev);
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out_release_region:
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release_mem_region(base_addr, mem_size);
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out_free:
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kfree(p);
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return -ENODEV;
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}
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static void __exit
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NCR_Q720_remove_one(struct Scsi_Host *host)
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{
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scsi_remove_host(host);
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ncr53c8xx_release(host);
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}
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static int __exit
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NCR_Q720_remove(struct device *dev)
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{
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struct NCR_Q720_private *p = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < p->siops; i++)
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if(p->hosts[i])
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NCR_Q720_remove_one(p->hosts[i]);
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dma_release_declared_memory(dev);
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release_mem_region(p->phys_mem_base, p->mem_size);
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free_irq(p->irq, p);
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kfree(p);
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return 0;
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}
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static short NCR_Q720_id_table[] = { NCR_Q720_MCA_ID, 0 };
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static struct mca_driver NCR_Q720_driver = {
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.id_table = NCR_Q720_id_table,
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.driver = {
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.name = "NCR_Q720",
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.bus = &mca_bus_type,
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.probe = NCR_Q720_probe,
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.remove = NCR_Q720_remove,
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},
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};
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static int __init
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NCR_Q720_init(void)
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{
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int ret = ncr53c8xx_init();
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if (!ret)
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ret = mca_register_driver(&NCR_Q720_driver);
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if (ret)
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ncr53c8xx_exit();
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return ret;
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}
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static void __exit
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NCR_Q720_exit(void)
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{
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mca_unregister_driver(&NCR_Q720_driver);
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ncr53c8xx_exit();
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}
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module_init(NCR_Q720_init);
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module_exit(NCR_Q720_exit);
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