[PATCH] Altix: ioc3 serial support

Add driver support for a 2 port PCI IOC3-based serial card on Altix boxes:

This is a re-submission.  On the original submission I was asked to
organize the code so that the MIPS ioc3 ethernet and serial parts could be
used with this driver.  Stanislaw Skowronek was kind enough to provide the
shim layer for this - thanks Stanislaw.  This patch includes the shim layer
and the Altix PCI ioc3 serial driver.  The MIPS merged ioc3 ethernet and
serial support is forthcoming.

Signed-off-by: Patrick Gefre <pfg@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 866 insertions, 0 deletions

diff --git a/drivers/sn/Kconfig b/drivers/sn/Kconfig
index 13b8d249da5c..d95265b187a3 100644
--- a/drivers/sn/Kconfig
+++ b/drivers/sn/Kconfig
@@ -17,4 +17,18 @@ config SGI_IOC4
         If you have an SGI Altix with an IOC4-based
         I/O controller say Y.  Otherwise say N.
 
+config SGI_IOC3
+        tristate "SGI IOC3 Base IO support"
+        depends on (IA64_GENERIC || IA64_SGI_SN2)
+        default m
+        ---help---
+        This option enables basic support for the SGI IOC3-based Base IO
+        controller card.  This option does not enable any specific
+        functions on such a card, but provides necessary infrastructure
+        for other drivers to utilize.
+
+        If you have an SGI Altix with an IOC3-based
+        I/O controller or a PCI IOC3 serial card say Y.
+        Otherwise say N.
+
 endmenu
diff --git a/drivers/sn/Makefile b/drivers/sn/Makefile
index c2a284185372..2cda011597c0 100644
--- a/drivers/sn/Makefile
+++ b/drivers/sn/Makefile
@@ -4,3 +4,4 @@
 #
 
 obj-$(CONFIG_SGI_IOC4) += ioc4.o
+obj-$(CONFIG_SGI_IOC3) += ioc3.o
diff --git a/drivers/sn/ioc3.c b/drivers/sn/ioc3.c
new file mode 100644
index 000000000000..aaa009f4a7bf
--- /dev/null
+++ b/drivers/sn/ioc3.c
@@ -0,0 +1,851 @@
+/*
+ * SGI IOC3 master driver and IRQ demuxer
+ *
+ * Copyright (c) 2005 Stanislaw Skowronek <skylark@linux-mips.org>
+ * Heavily based on similar work by:
+ *   Brent Casavant <bcasavan@sgi.com> - IOC4 master driver
+ *   Pat Gefre <pfg@sgi.com> - IOC3 serial port IRQ demuxer
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/ioc3.h>
+#include <linux/rwsem.h>
+
+#define IOC3_PCI_SIZE 0x100000
+
+static LIST_HEAD(ioc3_devices);
+static int ioc3_counter;
+static DECLARE_RWSEM(ioc3_devices_rwsem);
+
+static struct ioc3_submodule *ioc3_submodules[IOC3_MAX_SUBMODULES];
+static struct ioc3_submodule *ioc3_ethernet;
+static rwlock_t ioc3_submodules_lock = RW_LOCK_UNLOCKED;
+
+/* NIC probing code */
+
+#define GPCR_MLAN_EN    0x00200000      /* enable MCR to pin 8 */
+
+static inline unsigned mcr_pack(unsigned pulse, unsigned sample)
+{
+        return (pulse << 10) | (sample << 2);
+}
+
+static int nic_wait(struct ioc3_driver_data *idd)
+{
+        volatile unsigned mcr;
+
+        do {
+                mcr = (volatile unsigned)idd->vma->mcr;
+        } while (!(mcr & 2));
+
+        return mcr & 1;
+}
+
+static int nic_reset(struct ioc3_driver_data *idd)
+{
+        int presence;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        idd->vma->mcr = mcr_pack(500, 65);
+        presence = nic_wait(idd);
+        local_irq_restore(flags);
+
+        udelay(500);
+
+        return presence;
+}
+
+static inline int nic_read_bit(struct ioc3_driver_data *idd)
+{
+        int result;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        idd->vma->mcr = mcr_pack(6, 13);
+        result = nic_wait(idd);
+        local_irq_restore(flags);
+
+        udelay(500);
+
+        return result;
+}
+
+static inline void nic_write_bit(struct ioc3_driver_data *idd, int bit)
+{
+        if (bit)
+                idd->vma->mcr = mcr_pack(6, 110);
+        else
+                idd->vma->mcr = mcr_pack(80, 30);
+
+        nic_wait(idd);
+}
+
+static unsigned nic_read_byte(struct ioc3_driver_data *idd)
+{
+        unsigned result = 0;
+        int i;
+
+        for (i = 0; i < 8; i++)
+                result = (result >> 1) | (nic_read_bit(idd) << 7);
+
+        return result;
+}
+
+static void nic_write_byte(struct ioc3_driver_data *idd, int byte)
+{
+        int i, bit;
+
+        for (i = 8; i; i--) {
+                bit = byte & 1;
+                byte >>= 1;
+
+                nic_write_bit(idd, bit);
+        }
+}
+
+static unsigned long
+nic_find(struct ioc3_driver_data *idd, int *last, unsigned long addr)
+{
+        int a, b, index, disc;
+
+        nic_reset(idd);
+
+        /* Search ROM.  */
+        nic_write_byte(idd, 0xF0);
+
+        /* Algorithm from ``Book of iButton Standards''.  */
+        for (index = 0, disc = 0; index < 64; index++) {
+                a = nic_read_bit(idd);
+                b = nic_read_bit(idd);
+
+                if (a && b) {
+                        printk(KERN_WARNING "IOC3 NIC search failed.\n");
+                        *last = 0;
+                        return 0;
+                }
+
+                if (!a && !b) {
+                        if (index == *last) {
+                                addr |= 1UL << index;
+                        } else if (index > *last) {
+                                addr &= ~(1UL << index);
+                                disc = index;
+                        } else if ((addr & (1UL << index)) == 0)
+                                disc = index;
+                        nic_write_bit(idd, (addr>>index)&1);
+                        continue;
+                } else {
+                        if (a)
+                                addr |= 1UL << index;
+                        else
+                                addr &= ~(1UL << index);
+                        nic_write_bit(idd, a);
+                        continue;
+                }
+        }
+        *last = disc;
+        return addr;
+}
+
+static void nic_addr(struct ioc3_driver_data *idd, unsigned long addr)
+{
+        int index;
+
+        nic_reset(idd);
+        nic_write_byte(idd, 0xF0);
+        for (index = 0; index < 64; index++) {
+                nic_read_bit(idd);
+                nic_read_bit(idd);
+                nic_write_bit(idd, (addr>>index)&1);
+        }
+}
+
+static void crc16_byte(unsigned int *crc, unsigned char db)
+{
+        int i;
+
+        for(i=0;i<8;i++) {
+                *crc <<= 1;
+                if((db^(*crc>>16)) & 1)
+                        *crc ^= 0x8005;
+                db >>= 1;
+        }
+        *crc &= 0xFFFF;
+}
+
+static unsigned int crc16_area(unsigned char *dbs, int size, unsigned int crc)
+{
+        while(size--)
+                crc16_byte(&crc, *(dbs++));
+        return crc;
+}
+
+static void crc8_byte(unsigned int *crc, unsigned char db)
+{
+        int i,f;
+
+        for(i=0;i<8;i++) {
+                f = (*crc ^ db) & 1;
+                *crc >>= 1;
+                db >>= 1;
+                if(f)
+                        *crc ^= 0x8c;
+        }
+        *crc &= 0xff;
+}
+
+static unsigned int crc8_addr(unsigned long addr)
+{
+        int i;
+        unsigned int crc = 0x00;
+
+        for(i=0;i<8;i++)
+                crc8_byte(&crc, addr>>(i<<3));
+        return crc;
+}
+
+static void
+read_redir_page(struct ioc3_driver_data *idd, unsigned long addr, int page,
+                        unsigned char *redir, unsigned char *data)
+{
+        int loops = 16, i;
+
+        while(redir[page] != 0xFF) {
+                page = redir[page]^0xFF;
+                loops--;
+                if(loops<0) {
+                        printk(KERN_ERR "IOC3: NIC circular redirection\n");
+                        return;
+                }
+        }
+        loops = 3;
+        while(loops>0) {
+                nic_addr(idd, addr);
+                nic_write_byte(idd, 0xF0);
+                nic_write_byte(idd, (page << 5) & 0xE0);
+                nic_write_byte(idd, (page >> 3) & 0x1F);
+                for(i=0;i<0x20;i++)
+                        data[i] = nic_read_byte(idd);
+                if(crc16_area(data, 0x20, 0x0000) == 0x800d)
+                        return;
+                loops--;
+        }
+        printk(KERN_ERR "IOC3: CRC error in data page\n");
+        for(i=0;i<0x20;i++)
+                data[i] = 0x00;
+}
+
+static void
+read_redir_map(struct ioc3_driver_data *idd, unsigned long addr,
+                                         unsigned char *redir)
+{
+        int i,j,loops = 3,crc_ok;
+        unsigned int crc;
+
+        while(loops>0) {
+                crc_ok = 1;
+                nic_addr(idd, addr);
+                nic_write_byte(idd, 0xAA);
+                nic_write_byte(idd, 0x00);
+                nic_write_byte(idd, 0x01);
+                for(i=0;i<64;i+=8) {
+                        for(j=0;j<8;j++)
+                                redir[i+j] = nic_read_byte(idd);
+                        crc = crc16_area(redir+i, 8, (i==0)?0x8707:0x0000);
+                        crc16_byte(&crc, nic_read_byte(idd));
+                        crc16_byte(&crc, nic_read_byte(idd));
+                        if(crc != 0x800d)
+                                crc_ok = 0;
+                }
+                if(crc_ok)
+                        return;
+                loops--;
+        }
+        printk(KERN_ERR "IOC3: CRC error in redirection page\n");
+        for(i=0;i<64;i++)
+                redir[i] = 0xFF;
+}
+
+static void read_nic(struct ioc3_driver_data *idd, unsigned long addr)
+{
+        unsigned char redir[64];
+        unsigned char data[64],part[32];
+        int i,j;
+
+        /* read redirections */
+        read_redir_map(idd, addr, redir);
+        /* read data pages */
+        read_redir_page(idd, addr, 0, redir, data);
+        read_redir_page(idd, addr, 1, redir, data+32);
+        /* assemble the part # */
+        j=0;
+        for(i=0;i<19;i++)
+                if(data[i+11] != ' ')
+                        part[j++] = data[i+11];
+        for(i=0;i<6;i++)
+                if(data[i+32] != ' ')
+                        part[j++] = data[i+32];
+        part[j] = 0;
+        /* skip Octane power supplies */
+        if(!strncmp(part, "060-0035-", 9))
+                return;
+        if(!strncmp(part, "060-0038-", 9))
+                return;
+        strcpy(idd->nic_part, part);
+        /* assemble the serial # */
+        j=0;
+        for(i=0;i<10;i++)
+                if(data[i+1] != ' ')
+                        idd->nic_serial[j++] = data[i+1];
+        idd->nic_serial[j] = 0;
+}
+
+static void read_mac(struct ioc3_driver_data *idd, unsigned long addr)
+{
+        int i, loops = 3;
+        unsigned char data[13];
+
+        while(loops>0) {
+                nic_addr(idd, addr);
+                nic_write_byte(idd, 0xF0);
+                nic_write_byte(idd, 0x00);
+                nic_write_byte(idd, 0x00);
+                nic_read_byte(idd);
+                for(i=0;i<13;i++)
+                        data[i] = nic_read_byte(idd);
+                if(crc16_area(data, 13, 0x0000) == 0x800d) {
+                        for(i=10;i>4;i--)
+                                idd->nic_mac[10-i] = data[i];
+                        return;
+                }
+                loops--;
+        }
+        printk(KERN_ERR "IOC3: CRC error in MAC address\n");
+        for(i=0;i<6;i++)
+                idd->nic_mac[i] = 0x00;
+}
+
+static void probe_nic(struct ioc3_driver_data *idd)
+{
+        int save = 0, loops = 3;
+        unsigned long first, addr;
+
+        idd->vma->gpcr_s = GPCR_MLAN_EN;
+
+        while(loops>0) {
+                idd->nic_part[0] = 0;
+                idd->nic_serial[0] = 0;
+                addr = first = nic_find(idd, &save, 0);
+                if(!first)
+                        return;
+                while(1) {
+                        if(crc8_addr(addr))
+                                break;
+                        else {
+                                switch(addr & 0xFF) {
+                                case 0x0B:
+                                        read_nic(idd, addr);
+                                        break;
+                                case 0x09:
+                                case 0x89:
+                                case 0x91:
+                                        read_mac(idd, addr);
+                                        break;
+                                }
+                        }
+                        addr = nic_find(idd, &save, addr);
+                        if(addr == first)
+                                return;
+                }
+                loops--;
+        }
+        printk(KERN_ERR "IOC3: CRC error in NIC address\n");
+}
+
+/* Interrupts */
+
+static inline void
+write_ireg(struct ioc3_driver_data *idd, uint32_t val, int which)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&idd->ir_lock, flags);
+        switch (which) {
+        case IOC3_W_IES:
+                writel(val, &idd->vma->sio_ies);
+                break;
+        case IOC3_W_IEC:
+                writel(val, &idd->vma->sio_iec);
+                break;
+        }
+        spin_unlock_irqrestore(&idd->ir_lock, flags);
+}
+static inline uint32_t get_pending_intrs(struct ioc3_driver_data *idd)
+{
+        unsigned long flag;
+        uint32_t intrs = 0;
+
+        spin_lock_irqsave(&idd->ir_lock, flag);
+        intrs = readl(&idd->vma->sio_ir);
+        intrs &= readl(&idd->vma->sio_ies);
+        spin_unlock_irqrestore(&idd->ir_lock, flag);
+        return intrs;
+}
+
+static irqreturn_t ioc3_intr_io(int irq, void *arg, struct pt_regs *regs)
+{
+        unsigned long flags;
+        struct ioc3_driver_data *idd = (struct ioc3_driver_data *)arg;
+        int handled = 1, id;
+        unsigned int pending;
+
+        read_lock_irqsave(&ioc3_submodules_lock, flags);
+
+        if(idd->dual_irq && idd->vma->eisr) {
+                /* send Ethernet IRQ to the driver */
+                if(ioc3_ethernet && idd->active[ioc3_ethernet->id] &&
+                                                ioc3_ethernet->intr) {
+                        handled = handled && !ioc3_ethernet->intr(ioc3_ethernet,
+                                                        idd, 0, regs);
+                }
+        }
+        pending = get_pending_intrs(idd);       /* look at the IO IRQs */
+
+        for(id=0;id<IOC3_MAX_SUBMODULES;id++) {
+                if(idd->active[id] && ioc3_submodules[id]
+                                && (pending & ioc3_submodules[id]->irq_mask)
+                                && ioc3_submodules[id]->intr) {
+                        write_ireg(idd, ioc3_submodules[id]->irq_mask,
+                                                        IOC3_W_IEC);
+                        if(!ioc3_submodules[id]->intr(ioc3_submodules[id],
+                                   idd, pending & ioc3_submodules[id]->irq_mask,
+                                        regs))
+                                pending &= ~ioc3_submodules[id]->irq_mask;
+                        if (ioc3_submodules[id]->reset_mask)
+                                write_ireg(idd, ioc3_submodules[id]->irq_mask,
+                                                        IOC3_W_IES);
+                }
+        }
+        read_unlock_irqrestore(&ioc3_submodules_lock, flags);
+        if(pending) {
+                printk(KERN_WARNING
+                  "IOC3: Pending IRQs 0x%08x discarded and disabled\n",pending);
+                write_ireg(idd, pending, IOC3_W_IEC);
+                handled = 1;
+        }
+        return handled?IRQ_HANDLED:IRQ_NONE;
+}
+
+static irqreturn_t ioc3_intr_eth(int irq, void *arg, struct pt_regs *regs)
+{
+        unsigned long flags;
+        struct ioc3_driver_data *idd = (struct ioc3_driver_data *)arg;
+        int handled = 1;
+
+        if(!idd->dual_irq)
+                return IRQ_NONE;
+        read_lock_irqsave(&ioc3_submodules_lock, flags);
+        if(ioc3_ethernet && idd->active[ioc3_ethernet->id]
+                                && ioc3_ethernet->intr)
+                handled = handled && !ioc3_ethernet->intr(ioc3_ethernet, idd, 0,
+                                                                regs);
+        read_unlock_irqrestore(&ioc3_submodules_lock, flags);
+        return handled?IRQ_HANDLED:IRQ_NONE;
+}
+
+void ioc3_enable(struct ioc3_submodule *is,
+                                struct ioc3_driver_data *idd, unsigned int irqs)
+{
+        write_ireg(idd, irqs & is->irq_mask, IOC3_W_IES);
+}
+
+void ioc3_ack(struct ioc3_submodule *is, struct ioc3_driver_data *idd,
+                                unsigned int irqs)
+{
+        writel(irqs & is->irq_mask, &idd->vma->sio_ir);
+}
+
+void ioc3_disable(struct ioc3_submodule *is,
+                                struct ioc3_driver_data *idd, unsigned int irqs)
+{
+        write_ireg(idd, irqs & is->irq_mask, IOC3_W_IEC);
+}
+
+void ioc3_gpcr_set(struct ioc3_driver_data *idd, unsigned int val)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&idd->gpio_lock, flags);
+        writel(val, &idd->vma->gpcr_s);
+        spin_unlock_irqrestore(&idd->gpio_lock, flags);
+}
+
+/* Keep it simple, stupid! */
+static int find_slot(void **tab, int max)
+{
+        int i;
+        for(i=0;i<max;i++)
+                if(!(tab[i]))
+                        return i;
+        return -1;
+}
+
+/* Register an IOC3 submodule */
+int ioc3_register_submodule(struct ioc3_submodule *is)
+{
+        struct ioc3_driver_data *idd;
+        int alloc_id;
+        unsigned long flags;
+
+        write_lock_irqsave(&ioc3_submodules_lock, flags);
+        alloc_id = find_slot((void **)ioc3_submodules, IOC3_MAX_SUBMODULES);
+        if(alloc_id != -1) {
+                ioc3_submodules[alloc_id] = is;
+                if(is->ethernet) {
+                        if(ioc3_ethernet==NULL)
+                                ioc3_ethernet=is;
+                        else
+                                printk(KERN_WARNING
+                                  "IOC3 Ethernet module already registered!\n");
+                }
+        }
+        write_unlock_irqrestore(&ioc3_submodules_lock, flags);
+
+        if(alloc_id == -1) {
+                printk(KERN_WARNING "Increase IOC3_MAX_SUBMODULES!\n");
+                return -ENOMEM;
+        }
+
+        is->id=alloc_id;
+
+        /* Initialize submodule for each IOC3 */
+        if (!is->probe)
+                return 0;
+
+        down_read(&ioc3_devices_rwsem);
+        list_for_each_entry(idd, &ioc3_devices, list) {
+                /* set to 1 for IRQs in probe */
+                idd->active[alloc_id] = 1;
+                idd->active[alloc_id] = !is->probe(is, idd);
+        }
+        up_read(&ioc3_devices_rwsem);
+
+        return 0;
+}
+
+/* Unregister an IOC3 submodule */
+void ioc3_unregister_submodule(struct ioc3_submodule *is)
+{
+        struct ioc3_driver_data *idd;
+        unsigned long flags;
+
+        write_lock_irqsave(&ioc3_submodules_lock, flags);
+        if(ioc3_submodules[is->id]==is)
+                ioc3_submodules[is->id]=NULL;
+        else
+                printk(KERN_WARNING
+                        "IOC3 submodule %s has wrong ID.\n",is->name);
+        if(ioc3_ethernet==is)
+                ioc3_ethernet = NULL;
+        write_unlock_irqrestore(&ioc3_submodules_lock, flags);
+
+        /* Remove submodule for each IOC3 */
+        down_read(&ioc3_devices_rwsem);
+        list_for_each_entry(idd, &ioc3_devices, list)
+                if(idd->active[is->id]) {
+                        if(is->remove)
+                                if(is->remove(is, idd))
+                                        printk(KERN_WARNING
+                                               "%s: IOC3 submodule %s remove failed "
+                                               "for pci_dev %s.\n",
+                                               __FUNCTION__, module_name(is->owner),
+                                               pci_name(idd->pdev));
+                        idd->active[is->id] = 0;
+                        if(is->irq_mask)
+                                write_ireg(idd, is->irq_mask, IOC3_W_IEC);
+                }
+        up_read(&ioc3_devices_rwsem);
+}
+
+/*********************
+ * Device management *
+ *********************/
+
+static char *
+ioc3_class_names[]={"unknown", "IP27 BaseIO", "IP30 system", "MENET 1/2/3",
+                        "MENET 4", "CADduo", "Altix Serial"};
+
+static int ioc3_class(struct ioc3_driver_data *idd)
+{
+        int res = IOC3_CLASS_NONE;
+        /* NIC-based logic */
+        if(!strncmp(idd->nic_part, "030-0891-", 9))
+                res = IOC3_CLASS_BASE_IP30;
+        if(!strncmp(idd->nic_part, "030-1155-", 9))
+                res = IOC3_CLASS_CADDUO;
+        if(!strncmp(idd->nic_part, "030-1657-", 9))
+                res = IOC3_CLASS_SERIAL;
+        if(!strncmp(idd->nic_part, "030-1664-", 9))
+                res = IOC3_CLASS_SERIAL;
+        /* total random heuristics */
+#ifdef CONFIG_SGI_IP27
+        if(!idd->nic_part[0])
+                res = IOC3_CLASS_BASE_IP27;
+#endif
+        /* print educational message */
+        printk(KERN_INFO "IOC3 part: [%s], serial: [%s] => class %s\n",
+                        idd->nic_part, idd->nic_serial, ioc3_class_names[res]);
+        return res;
+}
+/* Adds a new instance of an IOC3 card */
+static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
+{
+        struct ioc3_driver_data *idd;
+        uint32_t pcmd;
+        int ret, id;
+
+        /* Enable IOC3 and take ownership of it */
+        if ((ret = pci_enable_device(pdev))) {
+                printk(KERN_WARNING
+                       "%s: Failed to enable IOC3 device for pci_dev %s.\n",
+                       __FUNCTION__, pci_name(pdev));
+                goto out;
+        }
+        pci_set_master(pdev);
+
+#ifdef USE_64BIT_DMA
+        ret = pci_set_dma_mask(pdev, 0xffffffffffffffffULL);
+        if (!ret) {
+                ret = pci_set_consistent_dma_mask(pdev, 0xffffffffffffffffULL);
+                if (ret < 0) {
+                        printk(KERN_WARNING "%s: Unable to obtain 64 bit DMA "
+                               "for consistent allocations\n",
+                                __FUNCTION__);
+                }
+        }
+#endif
+
+        /* Set up per-IOC3 data */
+        idd = kmalloc(sizeof(struct ioc3_driver_data), GFP_KERNEL);
+        if (!idd) {
+                printk(KERN_WARNING
+                       "%s: Failed to allocate IOC3 data for pci_dev %s.\n",
+                       __FUNCTION__, pci_name(pdev));
+                ret = -ENODEV;
+                goto out_idd;
+        }
+        memset(idd, 0, sizeof(struct ioc3_driver_data));
+        spin_lock_init(&idd->ir_lock);
+        spin_lock_init(&idd->gpio_lock);
+        idd->pdev = pdev;
+
+        /* Map all IOC3 registers.  These are shared between subdevices
+         * so the main IOC3 module manages them.
+         */
+        idd->pma = pci_resource_start(pdev, 0);
+        if (!idd->pma) {
+                printk(KERN_WARNING
+                       "%s: Unable to find IOC3 resource "
+                       "for pci_dev %s.\n",
+                       __FUNCTION__, pci_name(pdev));
+                ret = -ENODEV;
+                goto out_pci;
+        }
+        if (!request_region(idd->pma, IOC3_PCI_SIZE, "ioc3")) {
+                printk(KERN_WARNING
+                       "%s: Unable to request IOC3 region "
+                       "for pci_dev %s.\n",
+                       __FUNCTION__, pci_name(pdev));
+                ret = -ENODEV;
+                goto out_pci;
+        }
+        idd->vma = ioremap(idd->pma, IOC3_PCI_SIZE);
+        if (!idd->vma) {
+                printk(KERN_WARNING
+                       "%s: Unable to remap IOC3 region "
+                       "for pci_dev %s.\n",
+                       __FUNCTION__, pci_name(pdev));
+                ret = -ENODEV;
+                goto out_misc_region;
+        }
+
+        /* Track PCI-device specific data */
+        pci_set_drvdata(pdev, idd);
+        down_write(&ioc3_devices_rwsem);
+        list_add(&idd->list, &ioc3_devices);
+        idd->id = ioc3_counter++;
+        up_write(&ioc3_devices_rwsem);
+
+        idd->gpdr_shadow = idd->vma->gpdr;
+
+        /* Read IOC3 NIC contents */
+        probe_nic(idd);
+
+        /* Detect IOC3 class */
+        idd->class = ioc3_class(idd);
+
+        /* Initialize IOC3 */
+       pci_read_config_dword(pdev, PCI_COMMAND, &pcmd);
+       pci_write_config_dword(pdev, PCI_COMMAND,
+                               pcmd | PCI_COMMAND_MEMORY |
+                               PCI_COMMAND_PARITY | PCI_COMMAND_SERR |
+                               PCI_SCR_DROP_MODE_EN);
+
+        write_ireg(idd, ~0, IOC3_W_IEC);
+        writel(~0, &idd->vma->sio_ir);
+
+        /* Set up IRQs */
+        if(idd->class == IOC3_CLASS_BASE_IP30
+                                || idd->class == IOC3_CLASS_BASE_IP27) {
+                writel(0, &idd->vma->eier);
+                writel(~0, &idd->vma->eisr);
+
+                idd->dual_irq = 1;
+                if (!request_irq(pdev->irq, ioc3_intr_eth, SA_SHIRQ,
+                                 "ioc3-eth", (void *)idd)) {
+                        idd->irq_eth = pdev->irq;
+                } else {
+                        printk(KERN_WARNING
+                               "%s : request_irq fails for IRQ 0x%x\n ",
+                               __FUNCTION__, pdev->irq);
+                }
+                if (!request_irq(pdev->irq+2, ioc3_intr_io, SA_SHIRQ,
+                                 "ioc3-io", (void *)idd)) {
+                        idd->irq_io = pdev->irq+2;
+                } else {
+                        printk(KERN_WARNING
+                               "%s : request_irq fails for IRQ 0x%x\n ",
+                               __FUNCTION__, pdev->irq+2);
+                }
+        } else {
+                if (!request_irq(pdev->irq, ioc3_intr_io, SA_SHIRQ,
+                                 "ioc3", (void *)idd)) {
+                        idd->irq_io = pdev->irq;
+                } else {
+                        printk(KERN_WARNING
+                               "%s : request_irq fails for IRQ 0x%x\n ",
+                               __FUNCTION__, pdev->irq);
+                }
+        }
+
+        /* Add this IOC3 to all submodules */
+        read_lock(&ioc3_submodules_lock);
+        for(id=0;id<IOC3_MAX_SUBMODULES;id++)
+                if(ioc3_submodules[id] && ioc3_submodules[id]->probe) {
+                        idd->active[id] = 1;
+                        idd->active[id] = !ioc3_submodules[id]->probe
+                                                (ioc3_submodules[id], idd);
+                }
+        read_unlock(&ioc3_submodules_lock);
+
+        printk(KERN_INFO "IOC3 Master Driver loaded for %s\n", pci_name(pdev));
+
+        return 0;
+
+out_misc_region:
+        release_region(idd->pma, IOC3_PCI_SIZE);
+out_pci:
+        kfree(idd);
+out_idd:
+        pci_disable_device(pdev);
+out:
+        return ret;
+}
+
+/* Removes a particular instance of an IOC3 card. */
+static void ioc3_remove(struct pci_dev *pdev)
+{
+        int id;
+        struct ioc3_driver_data *idd;
+
+        idd = pci_get_drvdata(pdev);
+
+        /* Remove this IOC3 from all submodules */
+        read_lock(&ioc3_submodules_lock);
+        for(id=0;id<IOC3_MAX_SUBMODULES;id++)
+                if(idd->active[id]) {
+                        if(ioc3_submodules[id] && ioc3_submodules[id]->remove)
+                                if(ioc3_submodules[id]->remove(ioc3_submodules[id],
+                                                                idd))
+                                        printk(KERN_WARNING
+                                               "%s: IOC3 submodule 0x%s remove failed "
+                                               "for pci_dev %s.\n",
+                                                __FUNCTION__,
+                                                module_name(ioc3_submodules[id]->owner),
+                                                pci_name(pdev));
+                        idd->active[id] = 0;
+                }
+        read_unlock(&ioc3_submodules_lock);
+
+        /* Clear and disable all IRQs */
+        write_ireg(idd, ~0, IOC3_W_IEC);
+        writel(~0, &idd->vma->sio_ir);
+
+        /* Release resources */
+        free_irq(idd->irq_io, (void *)idd);
+        if(idd->dual_irq)
+                free_irq(idd->irq_eth, (void *)idd);
+        iounmap(idd->vma);
+        release_region(idd->pma, IOC3_PCI_SIZE);
+
+        /* Disable IOC3 and relinquish */
+        pci_disable_device(pdev);
+
+        /* Remove and free driver data */
+        down_write(&ioc3_devices_rwsem);
+        list_del(&idd->list);
+        up_write(&ioc3_devices_rwsem);
+        kfree(idd);
+}
+
+static struct pci_device_id ioc3_id_table[] = {
+        {PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, PCI_ANY_ID, PCI_ANY_ID},
+        {0}
+};
+
+static struct pci_driver ioc3_driver = {
+        .name = "IOC3",
+        .id_table = ioc3_id_table,
+        .probe = ioc3_probe,
+        .remove = ioc3_remove,
+};
+
+MODULE_DEVICE_TABLE(pci, ioc3_id_table);
+
+/*********************
+ * Module management *
+ *********************/
+
+/* Module load */
+static int __devinit ioc3_init(void)
+{
+        if (ia64_platform_is("sn2"))
+                return pci_register_driver(&ioc3_driver);
+        return 0;
+}
+
+/* Module unload */
+static void __devexit ioc3_exit(void)
+{
+        pci_unregister_driver(&ioc3_driver);
+}
+
+module_init(ioc3_init);
+module_exit(ioc3_exit);
+
+MODULE_AUTHOR("Stanislaw Skowronek <skylark@linux-mips.org>");
+MODULE_DESCRIPTION("PCI driver for SGI IOC3");
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(ioc3_register_submodule);
+EXPORT_SYMBOL(ioc3_unregister_submodule);
+EXPORT_SYMBOL(ioc3_ack);
+EXPORT_SYMBOL(ioc3_gpcr_set);
+EXPORT_SYMBOL(ioc3_disable);
+EXPORT_SYMBOL(ioc3_enable);