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// 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>
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();
}
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