/* * PCI handling of I2O controller * * Copyright (C) 1999-2002 Red Hat Software * * Written by Alan Cox, Building Number Three Ltd * * 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. * * A lot of the I2O message side code from this is taken from the Red * Creek RCPCI45 adapter driver by Red Creek Communications * * Fixes/additions: * Philipp Rumpf * Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI> * Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI> * Deepak Saxena <deepak@plexity.net> * Boji T Kannanthanam <boji.t.kannanthanam@intel.com> * Alan Cox <alan@redhat.com>: * Ported to Linux 2.5. * Markus Lidel <Markus.Lidel@shadowconnect.com>: * Minor fixes for 2.6. * Markus Lidel <Markus.Lidel@shadowconnect.com>: * Support for sysfs included. */ #include <linux/pci.h> #include <linux/interrupt.h> #include <linux/i2o.h> #include "core.h" #define OSM_DESCRIPTION "I2O-subsystem" /* PCI device id table for all I2O controllers */ static struct pci_device_id __devinitdata i2o_pci_ids[] = { {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)}, {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)}, {.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962, .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID}, {0} }; /** * i2o_pci_free - Frees the DMA memory for the I2O controller * @c: I2O controller to free * * Remove all allocated DMA memory and unmap memory IO regions. If MTRR * is enabled, also remove it again. */ static void i2o_pci_free(struct i2o_controller *c) { struct device *dev; dev = &c->pdev->dev; i2o_dma_free(dev, &c->out_queue); i2o_dma_free(dev, &c->status_block); kfree(c->lct); i2o_dma_free(dev, &c->dlct); i2o_dma_free(dev, &c->hrt); i2o_dma_free(dev, &c->status); if (c->raptor && c->in_queue.virt) iounmap(c->in_queue.virt); if (c->base.virt) iounmap(c->base.virt); pci_release_regions(c->pdev); } /** * i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller * @c: I2O controller * * Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All * IO mappings are also done here. If MTRR is enabled, also do add memory * regions here. * * Returns 0 on success or negative error code on failure. */ static int __devinit i2o_pci_alloc(struct i2o_controller *c) { struct pci_dev *pdev = c->pdev; struct device *dev = &pdev->dev; int i; if (pci_request_regions(pdev, OSM_DESCRIPTION)) { printk(KERN_ERR "%s: device already claimed\n", c->name); return -ENODEV; } for (i = 0; i < 6; i++) { /* Skip I/O spaces */ if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) { if (!c->base.phys) { c->base.phys = pci_resource_start(pdev, i); c->base.len = pci_resource_len(pdev, i); /* * If we know what card it is, set the size * correctly. Code is taken from dpt_i2o.c */ if (pdev->device == 0xa501) { if (pdev->subsystem_device >= 0xc032 && pdev->subsystem_device <= 0xc03b) { if (c->base.len > 0x400000) c->base.len = 0x400000; } else { if (c->base.len > 0x100000) c->base.len = 0x100000; } } if (!c->raptor) break; } else { c->in_queue.phys = pci_resource_start(pdev, i); c->in_queue.len = pci_resource_len(pdev, i); break; } } } if (i == 6) { printk(KERN_ERR "%s: I2O controller has no memory regions" " defined.\n", c->name); i2o_pci_free(c); return -EINVAL; } /* Map the I2O controller */ if (c->raptor) { printk(KERN_INFO "%s: PCI I2O controller\n", c->name); printk(KERN_INFO " BAR0 at 0x%08lX size=%ld\n", (unsigned long)c->base.phys, (unsigned long)c->base.len); printk(KERN_INFO " BAR1 at 0x%08lX size=%ld\n", (unsigned long)c->in_queue.phys, (unsigned long)c->in_queue.len); } else printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n", c->name, (unsigned long)c->base.phys, (unsigned long)c->base.len); c->base.virt = ioremap_nocache(c->base.phys, c->base.len); if (!c->base.virt) { printk(KERN_ERR "%s: Unable to map controller.\n", c->name); i2o_pci_free(c); return -ENOMEM; } if (c->raptor) { c->in_queue.virt = ioremap_nocache(c->in_queue.phys, c->in_queue.len); if (!c->in_queue.virt) { printk(KERN_ERR "%s: Unable to map controller.\n", c->name); i2o_pci_free(c); return -ENOMEM; } } else c->in_queue = c->base; c->irq_status = c->base.virt + I2O_IRQ_STATUS; c->irq_mask = c->base.virt + I2O_IRQ_MASK; c->in_port = c->base.virt + I2O_IN_PORT; c->out_port = c->base.virt + I2O_OUT_PORT; /* Motorola/Freescale chip does not follow spec */ if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) { /* Check if CPU is enabled */ if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) { printk(KERN_INFO "%s: MPC82XX needs CPU running to " "service I2O.\n", c->name); i2o_pci_free(c); return -ENODEV; } else { c->irq_status += I2O_MOTOROLA_PORT_OFFSET; c->irq_mask += I2O_MOTOROLA_PORT_OFFSET; c->in_port += I2O_MOTOROLA_PORT_OFFSET; c->out_port += I2O_MOTOROLA_PORT_OFFSET; printk(KERN_INFO "%s: MPC82XX workarounds activated.\n", c->name); } } if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) { i2o_pci_free(c); return -ENOMEM; } if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) { i2o_pci_free(c); return -ENOMEM; } if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) { i2o_pci_free(c); return -ENOMEM; } if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block), GFP_KERNEL)) { i2o_pci_free(c); return -ENOMEM; } if (i2o_dma_alloc (dev, &c->out_queue, I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE * sizeof(u32), GFP_KERNEL)) { i2o_pci_free(c); return -ENOMEM; } pci_set_drvdata(pdev, c); return 0; } /** * i2o_pci_interrupt - Interrupt handler for I2O controller * @irq: interrupt line * @dev_id: pointer to the I2O controller * * Handle an interrupt from a PCI based I2O controller. This turns out * to be rather simple. We keep the controller pointer in the cookie. */ static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id) { struct i2o_controller *c = dev_id; u32 m; irqreturn_t rc = IRQ_NONE; while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) { m = readl(c->out_port); if (m == I2O_QUEUE_EMPTY) { /* * Old 960 steppings had a bug in the I2O unit that * caused the queue to appear empty when it wasn't. */ m = readl(c->out_port); if (unlikely(m == I2O_QUEUE_EMPTY)) break; } /* dispatch it */ if (i2o_driver_dispatch(c, m)) /* flush it if result != 0 */ i2o_flush_reply(c, m); rc = IRQ_HANDLED; } return rc; } /** * i2o_pci_irq_enable - Allocate interrupt for I2O controller * @c: i2o_controller that the request is for * * Allocate an interrupt for the I2O controller, and activate interrupts * on the I2O controller. * * Returns 0 on success or negative error code on failure. */ static int i2o_pci_irq_enable(struct i2o_controller *c) { struct pci_dev *pdev = c->pdev; int rc; writel(0xffffffff, c->irq_mask); if (pdev->irq) { rc = request_irq(pdev->irq, i2o_pci_interrupt, IRQF_SHARED, c->name, c); if (rc < 0) { printk(KERN_ERR "%s: unable to allocate interrupt %d." "\n", c->name, pdev->irq); return rc; } } writel(0x00000000, c->irq_mask); printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq); return 0; } /** * i2o_pci_irq_disable - Free interrupt for I2O controller * @c: I2O controller * * Disable interrupts in I2O controller and then free interrupt. */ static void i2o_pci_irq_disable(struct i2o_controller *c) { writel(0xffffffff, c->irq_mask); if (c->pdev->irq > 0) free_irq(c->pdev->irq, c); } /** * i2o_pci_probe - Probe the PCI device for an I2O controller * @pdev: PCI device to test * @id: id which matched with the PCI device id table * * Probe the PCI device for any device which is a memory of the * Intelligent, I2O class or an Adaptec Zero Channel Controller. We * attempt to set up each such device and register it with the core. * * Returns 0 on success or negative error code on failure. */ static int __devinit i2o_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct i2o_controller *c; int rc; struct pci_dev *i960 = NULL; printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n"); if ((pdev->class & 0xff) > 1) { printk(KERN_WARNING "i2o: %s does not support I2O 1.5 " "(skipping).\n", pci_name(pdev)); return -ENODEV; } if ((rc = pci_enable_device(pdev))) { printk(KERN_WARNING "i2o: couldn't enable device %s\n", pci_name(pdev)); return rc; } if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) { printk(KERN_WARNING "i2o: no suitable DMA found for %s\n", pci_name(pdev)); rc = -ENODEV; goto disable; } pci_set_master(pdev); c = i2o_iop_alloc(); if (IS_ERR(c)) { printk(KERN_ERR "i2o: couldn't allocate memory for %s\n", pci_name(pdev)); rc = PTR_ERR(c); goto disable; } else printk(KERN_INFO "%s: controller found (%s)\n", c->name, pci_name(pdev)); c->pdev = pdev; c->device.parent = &pdev->dev; /* Cards that fall apart if you hit them with large I/O loads... */ if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) { c->short_req = 1; printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n", c->name); } if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) { /* * Expose the ship behind i960 for initialization, or it will * failed */ i960 = pci_get_slot(c->pdev->bus, PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0)); if (i960) { pci_write_config_word(i960, 0x42, 0); pci_dev_put(i960); } c->promise = 1; c->limit_sectors = 1; } if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT) c->adaptec = 1; /* Cards that go bananas if you quiesce them before you reset them. */ if (pdev->vendor == PCI_VENDOR_ID_DPT) { c->no_quiesce = 1; if (pdev->device == 0xa511) c->raptor = 1; if (pdev->subsystem_device == 0xc05a) { c->limit_sectors = 1; printk(KERN_INFO "%s: limit sectors per request to %d\n", c->name, I2O_MAX_SECTORS_LIMITED); } #ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64 if (sizeof(dma_addr_t) > 4) { if (pci_set_dma_mask(pdev, DMA_64BIT_MASK)) printk(KERN_INFO "%s: 64-bit DMA unavailable\n", c->name); else { c->pae_support = 1; printk(KERN_INFO "%s: using 64-bit DMA\n", c->name); } } #endif } if ((rc = i2o_pci_alloc(c))) { printk(KERN_ERR "%s: DMA / IO allocation for I2O controller " "failed\n", c->name); goto free_controller; } if (i2o_pci_irq_enable(c)) { printk(KERN_ERR "%s: unable to enable interrupts for I2O " "controller\n", c->name); goto free_pci; } if ((rc = i2o_iop_add(c))) goto uninstall; if (i960) pci_write_config_word(i960, 0x42, 0x03ff); return 0; uninstall: i2o_pci_irq_disable(c); free_pci: i2o_pci_free(c); free_controller: i2o_iop_free(c); disable: pci_disable_device(pdev); return rc; } /** * i2o_pci_remove - Removes a I2O controller from the system * @pdev: I2O controller which should be removed * * Reset the I2O controller, disable interrupts and remove all allocated * resources. */ static void __devexit i2o_pci_remove(struct pci_dev *pdev) { struct i2o_controller *c; c = pci_get_drvdata(pdev); i2o_iop_remove(c); i2o_pci_irq_disable(c); i2o_pci_free(c); pci_disable_device(pdev); printk(KERN_INFO "%s: Controller removed.\n", c->name); put_device(&c->device); }; /* PCI driver for I2O controller */ static struct pci_driver i2o_pci_driver = { .name = "PCI_I2O", .id_table = i2o_pci_ids, .probe = i2o_pci_probe, .remove = __devexit_p(i2o_pci_remove), }; /** * i2o_pci_init - registers I2O PCI driver in PCI subsystem * * Returns > 0 on success or negative error code on failure. */ int __init i2o_pci_init(void) { return pci_register_driver(&i2o_pci_driver); }; /** * i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem */ void __exit i2o_pci_exit(void) { pci_unregister_driver(&i2o_pci_driver); }; MODULE_DEVICE_TABLE(pci, i2o_pci_ids);