Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+}