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path: root/drivers/pci/hotplug/cpci_hotplug_pci.c
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Diffstat (limited to 'drivers/pci/hotplug/cpci_hotplug_pci.c')
-rw-r--r--drivers/pci/hotplug/cpci_hotplug_pci.c661
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 00000000000..2e969616f29
--- /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;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-15 17:21:57 +0000