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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pci/hotplug/cpci_hotplug_pci.c | |
download | linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/pci/hotplug/cpci_hotplug_pci.c')
-rw-r--r-- | drivers/pci/hotplug/cpci_hotplug_pci.c | 661 |
1 files changed, 661 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpci_hotplug_pci.c b/drivers/pci/hotplug/cpci_hotplug_pci.c new file mode 100644 index 000000000000..2e969616f298 --- /dev/null +++ b/drivers/pci/hotplug/cpci_hotplug_pci.c @@ -0,0 +1,661 @@ +/* + * CompactPCI Hot Plug Driver PCI functions + * + * Copyright (C) 2002 by SOMA Networks, Inc. + * + * All rights reserved. + * + * 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. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <scottm@somanetworks.com> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/proc_fs.h> +#include "../pci.h" +#include "pci_hotplug.h" +#include "cpci_hotplug.h" + +#if !defined(MODULE) +#define MY_NAME "cpci_hotplug" +#else +#define MY_NAME THIS_MODULE->name +#endif + +extern int cpci_debug; + +#define dbg(format, arg...) \ + do { \ + if(cpci_debug) \ + printk (KERN_DEBUG "%s: " format "\n", \ + MY_NAME , ## arg); \ + } while(0) +#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg) +#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg) +#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg) + +#define ROUND_UP(x, a) (((x) + (a) - 1) & ~((a) - 1)) + + +u8 cpci_get_attention_status(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return 0; + } + + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return 0; + } + return hs_csr & 0x0008 ? 1 : 0; +} + +int cpci_set_attention_status(struct slot* slot, int status) +{ + int hs_cap; + u16 hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return 0; + } + + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return 0; + } + if(status) { + hs_csr |= HS_CSR_LOO; + } else { + hs_csr &= ~HS_CSR_LOO; + } + if(pci_bus_write_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + hs_csr)) { + return 0; + } + return 1; +} + +u16 cpci_get_hs_csr(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return 0xFFFF; + } + + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return 0xFFFF; + } + return hs_csr; +} + +#if 0 +u16 cpci_set_hs_csr(struct slot* slot, u16 hs_csr) +{ + int hs_cap; + u16 new_hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return 0xFFFF; + } + + /* Write out the new value */ + if(pci_bus_write_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + hs_csr)) { + return 0xFFFF; + } + + /* Read back what we just wrote out */ + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &new_hs_csr)) { + return 0xFFFF; + } + return new_hs_csr; +} +#endif + +int cpci_check_and_clear_ins(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + int ins = 0; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return 0; + } + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return 0; + } + if(hs_csr & HS_CSR_INS) { + /* Clear INS (by setting it) */ + if(pci_bus_write_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + hs_csr)) { + ins = 0; + } + ins = 1; + } + return ins; +} + +int cpci_check_ext(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + int ext = 0; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return 0; + } + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return 0; + } + if(hs_csr & HS_CSR_EXT) { + ext = 1; + } + return ext; +} + +int cpci_clear_ext(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return -ENODEV; + } + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return -ENODEV; + } + if(hs_csr & HS_CSR_EXT) { + /* Clear EXT (by setting it) */ + if(pci_bus_write_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + hs_csr)) { + return -ENODEV; + } + } + return 0; +} + +int cpci_led_on(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return -ENODEV; + } + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return -ENODEV; + } + if((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) { + /* Set LOO */ + hs_csr |= HS_CSR_LOO; + if(pci_bus_write_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + hs_csr)) { + err("Could not set LOO for slot %s", + slot->hotplug_slot->name); + return -ENODEV; + } + } + return 0; +} + +int cpci_led_off(struct slot* slot) +{ + int hs_cap; + u16 hs_csr; + + hs_cap = pci_bus_find_capability(slot->bus, + slot->devfn, + PCI_CAP_ID_CHSWP); + if(!hs_cap) { + return -ENODEV; + } + if(pci_bus_read_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + &hs_csr)) { + return -ENODEV; + } + if(hs_csr & HS_CSR_LOO) { + /* Clear LOO */ + hs_csr &= ~HS_CSR_LOO; + if(pci_bus_write_config_word(slot->bus, + slot->devfn, + hs_cap + 2, + hs_csr)) { + err("Could not clear LOO for slot %s", + slot->hotplug_slot->name); + return -ENODEV; + } + } + return 0; +} + + +/* + * Device configuration functions + */ + +static int cpci_configure_dev(struct pci_bus *bus, struct pci_dev *dev) +{ + u8 irq_pin; + int r; + + dbg("%s - enter", __FUNCTION__); + + /* NOTE: device already setup from prior scan */ + + /* FIXME: How would we know if we need to enable the expansion ROM? */ + pci_write_config_word(dev, PCI_ROM_ADDRESS, 0x00L); + + /* Assign resources */ + dbg("assigning resources for %02x:%02x.%x", + dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); + for (r = 0; r < 6; r++) { + struct resource *res = dev->resource + r; + if(res->flags) + pci_assign_resource(dev, r); + } + dbg("finished assigning resources for %02x:%02x.%x", + dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); + + /* Does this function have an interrupt at all? */ + dbg("checking for function interrupt"); + pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin); + if(irq_pin) { + dbg("function uses interrupt pin %d", irq_pin); + } + + /* + * Need to explicitly set irq field to 0 so that it'll get assigned + * by the pcibios platform dependent code called by pci_enable_device. + */ + dev->irq = 0; + + dbg("enabling device"); + pci_enable_device(dev); /* XXX check return */ + dbg("now dev->irq = %d", dev->irq); + if(irq_pin && dev->irq) { + pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); + } + + /* Can't use pci_insert_device at the moment, do it manually for now */ + pci_proc_attach_device(dev); + dbg("notifying drivers"); + //pci_announce_device_to_drivers(dev); + dbg("%s - exit", __FUNCTION__); + return 0; +} + +static int cpci_configure_bridge(struct pci_bus* bus, struct pci_dev* dev) +{ + int rc; + struct pci_bus* child; + struct resource* r; + u8 max, n; + u16 command; + + dbg("%s - enter", __FUNCTION__); + + /* Do basic bridge initialization */ + rc = pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x40); + if(rc) { + printk(KERN_ERR "%s - write of PCI_LATENCY_TIMER failed\n", __FUNCTION__); + } + rc = pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 0x40); + if(rc) { + printk(KERN_ERR "%s - write of PCI_SEC_LATENCY_TIMER failed\n", __FUNCTION__); + } + rc = pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, L1_CACHE_BYTES / 4); + if(rc) { + printk(KERN_ERR "%s - write of PCI_CACHE_LINE_SIZE failed\n", __FUNCTION__); + } + + /* + * Set parent bridge's subordinate field so that configuration space + * access will work in pci_scan_bridge and friends. + */ + max = pci_max_busnr(); + bus->subordinate = max + 1; + pci_write_config_byte(bus->self, PCI_SUBORDINATE_BUS, max + 1); + + /* Scan behind bridge */ + n = pci_scan_bridge(bus, dev, max, 2); + child = pci_find_bus(0, max + 1); + if (!child) + return -ENODEV; + pci_proc_attach_bus(child); + + /* + * Update parent bridge's subordinate field if there were more bridges + * behind the bridge that was scanned. + */ + if(n > max) { + bus->subordinate = n; + pci_write_config_byte(bus->self, PCI_SUBORDINATE_BUS, n); + } + + /* + * Update the bridge resources of the bridge to accommodate devices + * behind it. + */ + pci_bus_size_bridges(child); + pci_bus_assign_resources(child); + + /* Enable resource mapping via command register */ + command = PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY | PCI_COMMAND_SERR; + r = child->resource[0]; + if(r && r->start) { + command |= PCI_COMMAND_IO; + } + r = child->resource[1]; + if(r && r->start) { + command |= PCI_COMMAND_MEMORY; + } + r = child->resource[2]; + if(r && r->start) { + command |= PCI_COMMAND_MEMORY; + } + rc = pci_write_config_word(dev, PCI_COMMAND, command); + if(rc) { + err("Error setting command register"); + return rc; + } + + /* Set bridge control register */ + command = PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR | PCI_BRIDGE_CTL_NO_ISA; + rc = pci_write_config_word(dev, PCI_BRIDGE_CONTROL, command); + if(rc) { + err("Error setting bridge control register"); + return rc; + } + dbg("%s - exit", __FUNCTION__); + return 0; +} + +static int configure_visit_pci_dev(struct pci_dev_wrapped *wrapped_dev, + struct pci_bus_wrapped *wrapped_bus) +{ + int rc; + struct pci_dev *dev = wrapped_dev->dev; + struct pci_bus *bus = wrapped_bus->bus; + struct slot* slot; + + dbg("%s - enter", __FUNCTION__); + + /* + * We need to fix up the hotplug representation with the Linux + * representation. + */ + if(wrapped_dev->data) { + slot = (struct slot*) wrapped_dev->data; + slot->dev = dev; + } + + /* If it's a bridge, scan behind it for devices */ + if(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { + rc = cpci_configure_bridge(bus, dev); + if(rc) + return rc; + } + + /* Actually configure device */ + if(dev) { + rc = cpci_configure_dev(bus, dev); + if(rc) + return rc; + } + dbg("%s - exit", __FUNCTION__); + return 0; +} + +static int unconfigure_visit_pci_dev_phase2(struct pci_dev_wrapped *wrapped_dev, + struct pci_bus_wrapped *wrapped_bus) +{ + struct pci_dev *dev = wrapped_dev->dev; + struct slot* slot; + + dbg("%s - enter", __FUNCTION__); + if(!dev) + return -ENODEV; + + /* Remove the Linux representation */ + if(pci_remove_device_safe(dev)) { + err("Could not remove device\n"); + return -1; + } + + /* + * Now remove the hotplug representation. + */ + if(wrapped_dev->data) { + slot = (struct slot*) wrapped_dev->data; + slot->dev = NULL; + } else { + dbg("No hotplug representation for %02x:%02x.%x", + dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)); + } + dbg("%s - exit", __FUNCTION__); + return 0; +} + +static int unconfigure_visit_pci_bus_phase2(struct pci_bus_wrapped *wrapped_bus, + struct pci_dev_wrapped *wrapped_dev) +{ + struct pci_bus *bus = wrapped_bus->bus; + struct pci_bus *parent = bus->self->bus; + + dbg("%s - enter", __FUNCTION__); + + /* The cleanup code for proc entries regarding buses should be in the kernel... */ + if(bus->procdir) + dbg("detach_pci_bus %s", bus->procdir->name); + pci_proc_detach_bus(bus); + + /* The cleanup code should live in the kernel... */ + bus->self->subordinate = NULL; + + /* unlink from parent bus */ + list_del(&bus->node); + + /* Now, remove */ + if(bus) + kfree(bus); + + /* Update parent's subordinate field */ + if(parent) { + u8 n = pci_bus_max_busnr(parent); + if(n < parent->subordinate) { + parent->subordinate = n; + pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, n); + } + } + dbg("%s - exit", __FUNCTION__); + return 0; +} + +static struct pci_visit configure_functions = { + .visit_pci_dev = configure_visit_pci_dev, +}; + +static struct pci_visit unconfigure_functions_phase2 = { + .post_visit_pci_bus = unconfigure_visit_pci_bus_phase2, + .post_visit_pci_dev = unconfigure_visit_pci_dev_phase2 +}; + + +int cpci_configure_slot(struct slot* slot) +{ + int rc = 0; + + dbg("%s - enter", __FUNCTION__); + + if(slot->dev == NULL) { + dbg("pci_dev null, finding %02x:%02x:%x", + slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn)); + slot->dev = pci_find_slot(slot->bus->number, slot->devfn); + } + + /* Still NULL? Well then scan for it! */ + if(slot->dev == NULL) { + int n; + dbg("pci_dev still null"); + + /* + * This will generate pci_dev structures for all functions, but + * we will only call this case when lookup fails. + */ + n = pci_scan_slot(slot->bus, slot->devfn); + dbg("%s: pci_scan_slot returned %d", __FUNCTION__, n); + if(n > 0) + pci_bus_add_devices(slot->bus); + slot->dev = pci_find_slot(slot->bus->number, slot->devfn); + if(slot->dev == NULL) { + err("Could not find PCI device for slot %02x", slot->number); + return 0; + } + } + dbg("slot->dev = %p", slot->dev); + if(slot->dev) { + struct pci_dev *dev; + struct pci_dev_wrapped wrapped_dev; + struct pci_bus_wrapped wrapped_bus; + int i; + + memset(&wrapped_dev, 0, sizeof (struct pci_dev_wrapped)); + memset(&wrapped_bus, 0, sizeof (struct pci_bus_wrapped)); + + for (i = 0; i < 8; i++) { + dev = pci_find_slot(slot->bus->number, + PCI_DEVFN(PCI_SLOT(slot->dev->devfn), i)); + if(!dev) + continue; + wrapped_dev.dev = dev; + wrapped_bus.bus = slot->dev->bus; + if(i) + wrapped_dev.data = NULL; + else + wrapped_dev.data = (void*) slot; + rc = pci_visit_dev(&configure_functions, &wrapped_dev, &wrapped_bus); + } + } + + dbg("%s - exit, rc = %d", __FUNCTION__, rc); + return rc; +} + +int cpci_unconfigure_slot(struct slot* slot) +{ + int rc = 0; + int i; + struct pci_dev_wrapped wrapped_dev; + struct pci_bus_wrapped wrapped_bus; + struct pci_dev *dev; + + dbg("%s - enter", __FUNCTION__); + + if(!slot->dev) { + err("No device for slot %02x\n", slot->number); + return -ENODEV; + } + + memset(&wrapped_dev, 0, sizeof (struct pci_dev_wrapped)); + memset(&wrapped_bus, 0, sizeof (struct pci_bus_wrapped)); + + for (i = 0; i < 8; i++) { + dev = pci_find_slot(slot->bus->number, + PCI_DEVFN(PCI_SLOT(slot->devfn), i)); + if(dev) { + wrapped_dev.dev = dev; + wrapped_bus.bus = dev->bus; + if(i) + wrapped_dev.data = NULL; + else + wrapped_dev.data = (void*) slot; + dbg("%s - unconfigure phase 2", __FUNCTION__); + rc = pci_visit_dev(&unconfigure_functions_phase2, + &wrapped_dev, + &wrapped_bus); + if(rc) + break; + } + } + dbg("%s - exit, rc = %d", __FUNCTION__, rc); + return rc; +} |