1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/pcmcia/cardbus.c b/drivers/pcmcia/cardbus.c
new file mode 100644
index 0000000000..45c8252c8e
--- /dev/null
+++ b/drivers/pcmcia/cardbus.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cardbus.c -- 16-bit PCMCIA core support
+ *
+ * The initial developer of the original code is David A. Hinds
+ * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
+ * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
+ *
+ * (C) 1999		David A. Hinds
+ */
+
+/*
+ * Cardbus handling has been re-written to be more of a PCI bridge thing,
+ * and the PCI code basically does all the resource handling.
+ *
+ *		Linus, Jan 2000
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#include <pcmcia/ss.h>
+#include <pcmcia/cistpl.h>
+
+#include "cs_internal.h"
+
+static void cardbus_config_irq_and_cls(struct pci_bus *bus, int irq)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u8 irq_pin;
+
+		/*
+		 * Since there is only one interrupt available to
+		 * CardBus devices, all devices downstream of this
+		 * device must be using this IRQ.
+		 */
+		pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq_pin);
+		if (irq_pin) {
+			dev->irq = irq;
+			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+		}
+
+		/*
+		 * Some controllers transfer very slowly with 0 CLS.
+		 * Configure it.  This may fail as CLS configuration
+		 * is mandatory only for MWI.
+		 */
+		pci_set_cacheline_size(dev);
+
+		if (dev->subordinate)
+			cardbus_config_irq_and_cls(dev->subordinate, irq);
+	}
+}
+
+/**
+ * cb_alloc() - add CardBus device
+ * @s:		the pcmcia_socket where the CardBus device is located
+ *
+ * cb_alloc() allocates the kernel data structures for a Cardbus device
+ * and handles the lowest level PCI device setup issues.
+ */
+int __ref cb_alloc(struct pcmcia_socket *s)
+{
+	struct pci_bus *bus = s->cb_dev->subordinate;
+	struct pci_dev *dev;
+	unsigned int max, pass;
+
+	pci_lock_rescan_remove();
+
+	s->functions = pci_scan_slot(bus, PCI_DEVFN(0, 0));
+	pci_fixup_cardbus(bus);
+
+	max = bus->busn_res.start;
+	for (pass = 0; pass < 2; pass++)
+		for_each_pci_bridge(dev, bus)
+			max = pci_scan_bridge(bus, dev, max, pass);
+
+	/*
+	 * Size all resources below the CardBus controller.
+	 */
+	pci_bus_size_bridges(bus);
+	pci_bus_assign_resources(bus);
+	cardbus_config_irq_and_cls(bus, s->pci_irq);
+
+	/* socket specific tune function */
+	if (s->tune_bridge)
+		s->tune_bridge(s, bus);
+
+	pci_bus_add_devices(bus);
+
+	pci_unlock_rescan_remove();
+	return 0;
+}
+
+/**
+ * cb_free() - remove CardBus device
+ * @s:		the pcmcia_socket where the CardBus device was located
+ *
+ * cb_free() handles the lowest level PCI device cleanup.
+ */
+void cb_free(struct pcmcia_socket *s)
+{
+	struct pci_dev *bridge, *dev, *tmp;
+	struct pci_bus *bus;
+
+	bridge = s->cb_dev;
+	if (!bridge)
+		return;
+
+	bus = bridge->subordinate;
+	if (!bus)
+		return;
+
+	pci_lock_rescan_remove();
+
+	list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list)
+		pci_stop_and_remove_bus_device(dev);
+
+	pci_unlock_rescan_remove();
+}