i2o_pci.c
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上传日期:2013-02-24
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- /*
- * Find I2O capable controllers on the PCI bus, and register/install
- * them with the I2O layer
- *
- * (C) Copyright 1999 Red Hat Software
- *
- * Written by Alan Cox, Building Number Three Ltd
- * Modified by Deepak Saxena <deepak@plexity.net>
- * Modified by Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * TODO:
- * Support polled I2O PCI controllers.
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/i2o.h>
- #include <linux/errno.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <asm/io.h>
- #ifdef CONFIG_MTRR
- #include <asm/mtrr.h>
- #endif // CONFIG_MTRR
- #ifdef MODULE
- /*
- * Core function table
- * See <include/linux/i2o.h> for an explanation
- */
- static struct i2o_core_func_table *core;
- /* Core attach function */
- extern int i2o_pci_core_attach(struct i2o_core_func_table *);
- extern void i2o_pci_core_detach(void);
- #endif /* MODULE */
- /*
- * Free bus specific resources
- */
- static void i2o_pci_dispose(struct i2o_controller *c)
- {
- I2O_IRQ_WRITE32(c,0xFFFFFFFF);
- if(c->bus.pci.irq > 0)
- free_irq(c->bus.pci.irq, c);
- iounmap(((u8 *)c->post_port)-0x40);
- #ifdef CONFIG_MTRR
- if(c->bus.pci.mtrr_reg0 > 0)
- mtrr_del(c->bus.pci.mtrr_reg0, 0, 0);
- if(c->bus.pci.mtrr_reg1 > 0)
- mtrr_del(c->bus.pci.mtrr_reg1, 0, 0);
- #endif
- }
- /*
- * No real bus specific handling yet (note that later we will
- * need to 'steal' PCI devices on i960 mainboards)
- */
-
- static int i2o_pci_bind(struct i2o_controller *c, struct i2o_device *dev)
- {
- MOD_INC_USE_COUNT;
- return 0;
- }
- static int i2o_pci_unbind(struct i2o_controller *c, struct i2o_device *dev)
- {
- MOD_DEC_USE_COUNT;
- return 0;
- }
- /*
- * Bus specific enable/disable functions
- */
- static void i2o_pci_enable(struct i2o_controller *c)
- {
- I2O_IRQ_WRITE32(c, 0);
- c->enabled = 1;
- }
- static void i2o_pci_disable(struct i2o_controller *c)
- {
- I2O_IRQ_WRITE32(c, 0xFFFFFFFF);
- c->enabled = 0;
- }
- /*
- * Bus specific interrupt handler
- */
-
- static void i2o_pci_interrupt(int irq, void *dev_id, struct pt_regs *r)
- {
- struct i2o_controller *c = dev_id;
- #ifdef MODULE
- core->run_queue(c);
- #else
- i2o_run_queue(c);
- #endif /* MODULE */
- }
- /*
- * Install a PCI (or in theory AGP) i2o controller
- *
- * TODO: Add support for polled controllers
- */
- int __init i2o_pci_install(struct pci_dev *dev)
- {
- struct i2o_controller *c=kmalloc(sizeof(struct i2o_controller),
- GFP_KERNEL);
- u8 *mem;
- u32 memptr = 0;
- u32 size;
-
- int i;
- if(c==NULL)
- {
- printk(KERN_ERR "i2o: Insufficient memory to add controller.n");
- return -ENOMEM;
- }
- memset(c, 0, sizeof(*c));
- for(i=0; i<6; i++)
- {
- /* Skip I/O spaces */
- if(!(pci_resource_flags(dev, i) & IORESOURCE_IO))
- {
- memptr = pci_resource_start(dev, i);
- break;
- }
- }
-
- if(i==6)
- {
- printk(KERN_ERR "i2o: I2O controller has no memory regions defined.n");
- kfree(c);
- return -EINVAL;
- }
-
- size = dev->resource[i].end-dev->resource[i].start+1;
- /* Map the I2O controller */
-
- printk(KERN_INFO "i2o: PCI I2O controller at 0x%08X size=%dn", memptr, size);
- mem = ioremap(memptr, size);
- if(mem==NULL)
- {
- printk(KERN_ERR "i2o: Unable to map controller.n");
- kfree(c);
- return -EINVAL;
- }
- c->bus.pci.irq = -1;
- c->bus.pci.queue_buggy = 0;
- c->bus.pci.dpt = 0;
- c->bus.pci.short_req = 0;
- c->pdev = dev;
- c->irq_mask = (u32 *)(mem+0x34);
- c->post_port = (u32 *)(mem+0x40);
- c->reply_port = (u32 *)(mem+0x44);
- c->mem_phys = memptr;
- c->mem_offset = (u32)mem;
- c->destructor = i2o_pci_dispose;
-
- c->bind = i2o_pci_bind;
- c->unbind = i2o_pci_unbind;
- c->bus_enable = i2o_pci_enable;
- c->bus_disable = i2o_pci_disable;
-
- c->type = I2O_TYPE_PCI;
- /*
- * Cards that fall apart if you hit them with large I/O
- * loads...
- */
-
- if(dev->vendor == PCI_VENDOR_ID_NCR && dev->device == 0x0630)
- {
- c->bus.pci.short_req=1;
- printk(KERN_INFO "I2O: Symbios FC920 workarounds activated.n");
- }
- if(dev->subsystem_vendor == PCI_VENDOR_ID_PROMISE)
- {
- c->bus.pci.queue_buggy=1;
- if (dev->subsystem_device == 0x0000) /* SX6000 ???? */
- c->bus.pci.queue_buggy=2;
- printk(KERN_INFO "I2O: Promise workarounds activated.n");
- }
- /*
- * Cards that go bananas if you quiesce them before you reset
- * them
- */
-
- if(dev->vendor == PCI_VENDOR_ID_DPT)
- c->bus.pci.dpt=1;
-
- /*
- * Enable Write Combining MTRR for IOP's memory region
- */
- #ifdef CONFIG_MTRR
- c->bus.pci.mtrr_reg0 =
- mtrr_add(c->mem_phys, size, MTRR_TYPE_WRCOMB, 1);
- /*
- * If it is an INTEL i960 I/O processor then set the first 64K to Uncacheable
- * since the region contains the Messaging unit which shouldn't be cached.
- */
- c->bus.pci.mtrr_reg1 = -1;
- if(dev->vendor == PCI_VENDOR_ID_INTEL || dev->vendor == PCI_VENDOR_ID_DPT)
- {
- printk(KERN_INFO "I2O: MTRR workaround for Intel i960 processorn");
- c->bus.pci.mtrr_reg1 = mtrr_add(c->mem_phys, 65536, MTRR_TYPE_UNCACHABLE, 1);
- if(c->bus.pci.mtrr_reg1< 0)
- {
- printk(KERN_INFO "i2o_pci: Error in setting MTRR_TYPE_UNCACHABLEn");
- mtrr_del(c->bus.pci.mtrr_reg0, c->mem_phys, size);
- c->bus.pci.mtrr_reg0 = -1;
- }
- }
- #endif
- I2O_IRQ_WRITE32(c,0xFFFFFFFF);
- #ifdef MODULE
- i = core->install(c);
- #else
- i = i2o_install_controller(c);
- #endif /* MODULE */
-
- if(i<0)
- {
- printk(KERN_ERR "i2o: Unable to install controller.n");
- kfree(c);
- iounmap(mem);
- return i;
- }
- c->bus.pci.irq = dev->irq;
- if(c->bus.pci.irq)
- {
- i=request_irq(dev->irq, i2o_pci_interrupt, SA_SHIRQ,
- c->name, c);
- if(i<0)
- {
- printk(KERN_ERR "%s: unable to allocate interrupt %d.n",
- c->name, dev->irq);
- c->bus.pci.irq = -1;
- #ifdef MODULE
- core->delete(c);
- #else
- i2o_delete_controller(c);
- #endif /* MODULE */
- iounmap(mem);
- return -EBUSY;
- }
- }
- printk(KERN_INFO "%s: Installed at IRQ%dn", c->name, dev->irq);
- I2O_IRQ_WRITE32(c,0x0);
- c->enabled = 1;
- return 0;
- }
- int __init i2o_pci_scan(void)
- {
- struct pci_dev *dev;
- int count=0;
-
- printk(KERN_INFO "i2o: Checking for PCI I2O controllers...n");
- pci_for_each_dev(dev)
- {
- if((dev->class>>8)!=PCI_CLASS_INTELLIGENT_I2O)
- continue;
- if(dev->vendor == PCI_VENDOR_ID_DPT)
- {
- if(dev->device == 0xA501 || dev->device == 0xA511)
- {
- printk(KERN_INFO "i2o: Skipping Adaptec/DPT I2O raid with preferred native driver.n");
- continue;
- }
- }
- if((dev->class&0xFF)>1)
- {
- printk(KERN_INFO "i2o: I2O Controller found but does not support I2O 1.5 (skipping).n");
- continue;
- }
- if (pci_enable_device(dev))
- continue;
- printk(KERN_INFO "i2o: I2O controller on bus %d at %d.n",
- dev->bus->number, dev->devfn);
- pci_set_master(dev);
- if(i2o_pci_install(dev)==0)
- count++;
- }
- if(count)
- printk(KERN_INFO "i2o: %d I2O controller%s found and installed.n", count,
- count==1?"":"s");
- return count?count:-ENODEV;
- }
- #ifdef I2O_HOTPLUG_SUPPORT
- /*
- * Activate a newly found PCI I2O controller
- * Not used now, but will be needed in future for
- * hot plug PCI support
- */
- static void i2o_pci_activate(i2o_controller * c)
- {
- int i=0;
- struct i2o_controller *c;
-
- if(c->type == I2O_TYPE_PCI)
- {
- I2O_IRQ_WRITE32(c,0);
- #ifdef MODULE
- if(core->activate(c))
- #else
- if(i2o_activate_controller(c))
- #endif /* MODULE */
- {
- printk("%s: Failed to initialize.n", c->name);
- #ifdef MODULE
- core->unlock(c);
- core->delete(c);
- #else
- i2o_unlock_controller(c);
- i2o_delete_controller(c);
- #endif
- continue;
- }
- }
- }
- #endif // I2O_HOTPLUG_SUPPORT
- #ifdef MODULE
- int i2o_pci_core_attach(struct i2o_core_func_table *table)
- {
- MOD_INC_USE_COUNT;
- core = table;
- return i2o_pci_scan();
- }
- void i2o_pci_core_detach(void)
- {
- core = NULL;
- MOD_DEC_USE_COUNT;
- }
- int init_module(void)
- {
- printk(KERN_INFO "Linux I2O PCI support (c) 1999 Red Hat Software.n");
-
- core = NULL;
- return 0;
-
- }
- void cleanup_module(void)
- {
- }
- EXPORT_SYMBOL(i2o_pci_core_attach);
- EXPORT_SYMBOL(i2o_pci_core_detach);
- MODULE_AUTHOR("Red Hat Software");
- MODULE_DESCRIPTION("I2O PCI Interface");
- MODULE_LICENSE("GPL");
- #else
- void __init i2o_pci_init(void)
- {
- printk(KERN_INFO "Linux I2O PCI support (c) 1999 Red Hat Software.n");
- i2o_pci_scan();
- }
- #endif