Re: Merging Skylark's IOC3 patch

[Martin Michlmayr <tbm@cyrius.com>]

* Martin Michlmayr <tbm@cyrius.com> [2006-02-19 21:15]:
> Can you please review and/or merge Skylark's IOC3 patch from
> ftp://ftp.linux-mips.org/pub/linux/mips/people/skylark/linux-mips-2.6.14-ioc3-r26.patch.bz2
> 
> From my basic understanding I believe that this patch needs to be split up
> and submitted to different sub-system maintainers.


From: Stanislaw Skowronek <skylark@linux-mips.org>

[PATCH 1/6] [MIPS] Improved IOC3 driver

An an improved driver for the IOC3 bridge, used in SGI Origin and Octane.

Signed-off-by: Stanislaw Skowronek <skylark@linux-mips.org>
Signed-off-by: Martin Michlmayr <tbm@cyrius.com>

---

 Kconfig      |    8
 pci/Makefile |    2
 pci/ioc3.c   |  801 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 811 insertions(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4ca93ff..3c5cc08 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1663,6 +1663,14 @@ config PCI_DOMAINS
 
 source "drivers/pci/Kconfig"
 
+config SGI_IOC3
+	bool "SGI IOC3 Master Driver"
+	depends on PCI
+	help
+	  If you have a Silicon Graphics Origin or Octane, say Y.
+	  This driver provides base for IOC3 feature drivers, such as
+	  Ethernet, keyboard, mouse, serial ports, LEDs and RTC.
+
 #
 # ISA support is now enabled via select.  Too many systems still have the one
 # or other ISA chip on the board that users don't know about so don't expect
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index 16205b5..8e0456b 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -57,3 +57,5 @@ obj-$(CONFIG_TOSHIBA_RBTX4927)	+= fixup-
 obj-$(CONFIG_TOSHIBA_RBTX4938)	+= fixup-tx4938.o ops-tx4938.o
 obj-$(CONFIG_VICTOR_MPC30X)	+= fixup-mpc30x.o
 obj-$(CONFIG_ZAO_CAPCELLA)	+= fixup-capcella.o
+
+obj-$(CONFIG_SGI_IOC3) += ioc3.o
--- /dev/null	2006-02-13 15:11:07.474148640 +0000
+++ b/arch/mips/pci/ioc3.c	2006-02-19 21:19:36.000000000 +0000
@@ -0,0 +1,801 @@
+/*
+ * 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>
+
+#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 DEFINE_RWLOCK(ioc3_submodules_lock);
+
+/* NIC probing code */
+
+static inline unsigned mcr_pack(unsigned pulse, unsigned sample)
+{
+	return (pulse << 10) | (sample << 2);
+}
+
+static int nic_wait(struct ioc3_driver_data *idd)
+{
+	unsigned mcr;
+
+        do {
+                mcr = 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 */
+
+#define IOC3_W_IES		0
+#define IOC3_W_IEC		1
+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;
+			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)
+{
+	write_ireg(idd, 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)
+{
+	write_ireg(idd, is->irq_mask, IOC3_W_IEC);
+}
+
+void ioc3_gpio(struct ioc3_driver_data *idd, unsigned int mask, unsigned int val)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&idd->gpio_lock, flags);
+	idd->gpdr_shadow &= ~mask;
+	idd->gpdr_shadow |= val&mask;
+	idd->vma->gpdr = idd->gpdr_shadow;
+	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);
+
+        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__);
+                }
+	}
+
+	/* 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_PARITY | PCI_COMMAND_SERR);
+
+	write_ireg(idd, ~0, IOC3_W_IEC);
+	writel(~0, &idd->vma->sio_ir);
+
+	writel(0, &idd->vma->eier);
+	writel(~0, &idd->vma->eisr);
+
+	/* Set up IRQs */
+	if(idd->class == IOC3_CLASS_BASE_IP30 || idd->class == IOC3_CLASS_BASE_IP27) {
+		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 = "SGI 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)
+{
+	return pci_register_driver(&ioc3_driver);
+}
+
+/* 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);


-- 
Martin Michlmayr
http://www.cyrius.com/