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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.c316
1 files changed, 316 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 000000000..389b8fb50
--- /dev/null
+++ b/drivers/pci/hotplug/cpci_hotplug_pci.c
@@ -0,0 +1,316 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * CompactPCI Hot Plug Driver PCI functions
+ *
+ * Copyright (C) 2002,2005 by SOMA Networks, Inc.
+ *
+ * All rights reserved.
+ *
+ * Send feedback to <scottm@somanetworks.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include <linux/proc_fs.h>
+#include "../pci.h"
+#include "cpci_hotplug.h"
+
+#define MY_NAME "cpci_hotplug"
+
+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)
+
+
+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;
+}
+
+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;
+ else
+ 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) {
+ 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",
+ hotplug_slot_name(slot->hotplug_slot));
+ 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) {
+ 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",
+ hotplug_slot_name(slot->hotplug_slot));
+ return -ENODEV;
+ }
+ }
+ return 0;
+}
+
+
+/*
+ * Device configuration functions
+ */
+
+int cpci_configure_slot(struct slot *slot)
+{
+ struct pci_dev *dev;
+ struct pci_bus *parent;
+ int ret = 0;
+
+ dbg("%s - enter", __func__);
+
+ pci_lock_rescan_remove();
+
+ 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_get_slot(slot->bus, 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", __func__, n);
+ slot->dev = pci_get_slot(slot->bus, slot->devfn);
+ if (slot->dev == NULL) {
+ err("Could not find PCI device for slot %02x", slot->number);
+ ret = -ENODEV;
+ goto out;
+ }
+ }
+ parent = slot->dev->bus;
+
+ for_each_pci_bridge(dev, parent) {
+ if (PCI_SLOT(dev->devfn) == PCI_SLOT(slot->devfn))
+ pci_hp_add_bridge(dev);
+ }
+
+ pci_assign_unassigned_bridge_resources(parent->self);
+
+ pci_bus_add_devices(parent);
+
+ out:
+ pci_unlock_rescan_remove();
+ dbg("%s - exit", __func__);
+ return ret;
+}
+
+int cpci_unconfigure_slot(struct slot *slot)
+{
+ struct pci_dev *dev, *temp;
+
+ dbg("%s - enter", __func__);
+ if (!slot->dev) {
+ err("No device for slot %02x\n", slot->number);
+ return -ENODEV;
+ }
+
+ pci_lock_rescan_remove();
+
+ list_for_each_entry_safe(dev, temp, &slot->bus->devices, bus_list) {
+ if (PCI_SLOT(dev->devfn) != PCI_SLOT(slot->devfn))
+ continue;
+ pci_dev_get(dev);
+ pci_stop_and_remove_bus_device(dev);
+ pci_dev_put(dev);
+ }
+ pci_dev_put(slot->dev);
+ slot->dev = NULL;
+
+ pci_unlock_rescan_remove();
+
+ dbg("%s - exit", __func__);
+ return 0;
+}
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