kevin/linux
1
Fork 0
Code
b0c4e148bd
linux/drivers/scsi/NCR_Q720.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

378 lines
9.2 KiB
C
Raw Blame History

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