diff options
Diffstat (limited to 'drivers/message/i2o/pci.c')
-rw-r--r-- | drivers/message/i2o/pci.c | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/drivers/message/i2o/pci.c b/drivers/message/i2o/pci.c new file mode 100644 index 0000000..e772752 --- /dev/null +++ b/drivers/message/i2o/pci.c @@ -0,0 +1,528 @@ +/* + * 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> + +#ifdef CONFIG_MTRR +#include <asm/mtrr.h> +#endif // CONFIG_MTRR + +/* Module internal functions from other sources */ +extern struct i2o_controller *i2o_iop_alloc(void); +extern void i2o_iop_free(struct i2o_controller *); + +extern int i2o_iop_add(struct i2o_controller *); +extern void i2o_iop_remove(struct i2o_controller *); + +extern int i2o_driver_dispatch(struct i2o_controller *, u32, + struct i2o_message *); + +/* 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)}, + {0} +}; + +/** + * i2o_dma_realloc - Realloc DMA memory + * @dev: struct device pointer to the PCI device of the I2O controller + * @addr: pointer to a i2o_dma struct DMA buffer + * @len: new length of memory + * @gfp_mask: GFP mask + * + * If there was something allocated in the addr, free it first. If len > 0 + * than try to allocate it and write the addresses back to the addr + * structure. If len == 0 set the virtual address to NULL. + * + * Returns the 0 on success or negative error code on failure. + */ +int i2o_dma_realloc(struct device *dev, struct i2o_dma *addr, size_t len, + unsigned int gfp_mask) +{ + i2o_dma_free(dev, addr); + + if (len) + return i2o_dma_alloc(dev, addr, len, gfp_mask); + + return 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); + if (c->lct) + kfree(c->lct); + i2o_dma_free(dev, &c->dlct); + i2o_dma_free(dev, &c->hrt); + i2o_dma_free(dev, &c->status); + +#ifdef CONFIG_MTRR + if (c->mtrr_reg0 >= 0) + mtrr_del(c->mtrr_reg0, 0, 0); + if (c->mtrr_reg1 >= 0) + mtrr_del(c->mtrr_reg1, 0, 0); +#endif + + if (c->raptor && c->in_queue.virt) + iounmap(c->in_queue.virt); + + if (c->base.virt) + iounmap(c->base.virt); +} + +/** + * 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; + + 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(c->base.phys, c->base.len); + if (!c->base.virt) { + printk(KERN_ERR "%s: Unable to map controller.\n", c->name); + return -ENOMEM; + } + + if (c->raptor) { + c->in_queue.virt = ioremap(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_mask = c->base.virt + 0x34; + c->post_port = c->base.virt + 0x40; + c->reply_port = c->base.virt + 0x44; + +#ifdef CONFIG_MTRR + /* Enable Write Combining MTRR for IOP's memory region */ + c->mtrr_reg0 = mtrr_add(c->in_queue.phys, c->in_queue.len, + MTRR_TYPE_WRCOMB, 1); + c->mtrr_reg1 = -1; + + if (c->mtrr_reg0 < 0) + printk(KERN_WARNING "%s: could not enable write combining " + "MTRR\n", c->name); + else + printk(KERN_INFO "%s: using write combining MTRR\n", c->name); + + /* + * 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. + */ + if ((pdev->vendor == PCI_VENDOR_ID_INTEL || + pdev->vendor == PCI_VENDOR_ID_DPT) && !c->raptor) { + printk(KERN_INFO "%s: MTRR workaround for Intel i960 processor" + "\n", c->name); + c->mtrr_reg1 = mtrr_add(c->base.phys, 0x10000, + MTRR_TYPE_UNCACHABLE, 1); + + if (c->mtrr_reg1 < 0) { + printk(KERN_WARNING "%s: Error in setting " + "MTRR_TYPE_UNCACHABLE\n", c->name); + mtrr_del(c->mtrr_reg0, c->in_queue.phys, + c->in_queue.len); + c->mtrr_reg0 = -1; + } + } +#endif + + 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, MSG_POOL_SIZE, 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 + * @r: pointer to registers + * + * 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 pt_regs *r) +{ + struct i2o_controller *c = dev_id; + struct device *dev = &c->pdev->dev; + struct i2o_message *m; + u32 mv; + + /* + * Old 960 steppings had a bug in the I2O unit that caused + * the queue to appear empty when it wasn't. + */ + mv = I2O_REPLY_READ32(c); + if (mv == I2O_QUEUE_EMPTY) { + mv = I2O_REPLY_READ32(c); + if (unlikely(mv == I2O_QUEUE_EMPTY)) { + return IRQ_NONE; + } else + pr_debug("%s: 960 bug detected\n", c->name); + } + + while (mv != I2O_QUEUE_EMPTY) { + /* + * Map the message from the page frame map to kernel virtual. + * Because bus_to_virt is deprecated, we have calculate the + * location by ourself! + */ + m = i2o_msg_out_to_virt(c, mv); + + /* + * Ensure this message is seen coherently but cachably by + * the processor + */ + dma_sync_single_for_cpu(dev, mv, MSG_FRAME_SIZE * 4, + PCI_DMA_FROMDEVICE); + + /* dispatch it */ + if (i2o_driver_dispatch(c, mv, m)) + /* flush it if result != 0 */ + i2o_flush_reply(c, mv); + + /* + * That 960 bug again... + */ + mv = I2O_REPLY_READ32(c); + if (mv == I2O_QUEUE_EMPTY) + mv = I2O_REPLY_READ32(c); + } + return IRQ_HANDLED; +} + +/** + * i2o_pci_irq_enable - Allocate interrupt for I2O controller + * + * 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; + + I2O_IRQ_WRITE32(c, 0xffffffff); + + if (pdev->irq) { + rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ, + c->name, c); + if (rc < 0) { + printk(KERN_ERR "%s: unable to allocate interrupt %d." + "\n", c->name, pdev->irq); + return rc; + } + } + + I2O_IRQ_WRITE32(c, 0x00000000); + + 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) +{ + I2O_IRQ_WRITE32(c, 0xffffffff); + + if (c->pdev->irq > 0) + free_irq(c->pdev->irq, c); +} + +/** + * i2o_pci_probe - Probe the PCI device for an I2O controller + * @dev: 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; + + printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n"); + + if ((pdev->class & 0xff) > 1) { + printk(KERN_WARNING "i2o: I2O controller found but does not " + "support I2O 1.5 (skipping).\n"); + return -ENODEV; + } + + if ((rc = pci_enable_device(pdev))) { + printk(KERN_WARNING "i2o: I2O controller found but could not be" + " enabled.\n"); + return rc; + } + + printk(KERN_INFO "i2o: I2O controller found on bus %d at %d.\n", + pdev->bus->number, pdev->devfn); + + if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) { + printk(KERN_WARNING "i2o: I2O controller on bus %d at %d: No " + "suitable DMA available!\n", pdev->bus->number, + pdev->devfn); + rc = -ENODEV; + goto disable; + } + + pci_set_master(pdev); + + c = i2o_iop_alloc(); + if (IS_ERR(c)) { + printk(KERN_ERR "i2o: memory for I2O controller could not be " + "allocated\n"); + rc = PTR_ERR(c); + goto disable; + } + + c->pdev = pdev; + c->device = 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) { + c->promise = 1; + printk(KERN_INFO "%s: Promise workarounds activated.\n", + c->name); + } + + /* 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 ((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; + + 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); + + printk(KERN_INFO "%s: Controller removed.\n", c->name); + + i2o_iop_free(c); + pci_disable_device(pdev); +}; + +/* PCI driver for I2O controller */ +static struct pci_driver i2o_pci_driver = { + .name = "I2O controller", + .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); +}; + +EXPORT_SYMBOL(i2o_dma_realloc); +MODULE_DEVICE_TABLE(pci, i2o_pci_ids); |