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Diffstat (limited to '')
-rw-r--r-- | drivers/pcmcia/cardbus.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/pcmcia/cardbus.c b/drivers/pcmcia/cardbus.c new file mode 100644 index 000000000..45c8252c8 --- /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(); +} |