.read = bcm63xx_pci_read,
.write = bcm63xx_pci_write
};
+
+#ifdef CONFIG_CARDBUS
+/*
+ * emulate configuration read access on a cardbus bridge
+ */
+#define FAKE_CB_BRIDGE_SLOT 0x1e
+
+static int fake_cb_bridge_bus_number = -1;
+
+static struct {
+ u16 pci_command;
+ u8 cb_latency;
+ u8 subordinate_busn;
+ u8 cardbus_busn;
+ u8 pci_busn;
+ int bus_assigned;
+ u16 bridge_control;
+
+ u32 mem_base0;
+ u32 mem_limit0;
+ u32 mem_base1;
+ u32 mem_limit1;
+
+ u32 io_base0;
+ u32 io_limit0;
+ u32 io_base1;
+ u32 io_limit1;
+} fake_cb_bridge_regs;
+
+static int fake_cb_bridge_read(int where, int size, u32 *val)
+{
+ unsigned int reg;
+ u32 data;
+
+ data = 0;
+ reg = where >> 2;
+ switch (reg) {
+ case (PCI_VENDOR_ID >> 2):
+ case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
+ /* create dummy vendor/device id from our cpu id */
+ data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM;
+ break;
+
+ case (PCI_COMMAND >> 2):
+ data = (PCI_STATUS_DEVSEL_SLOW << 16);
+ data |= fake_cb_bridge_regs.pci_command;
+ break;
+
+ case (PCI_CLASS_REVISION >> 2):
+ data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
+ break;
+
+ case (PCI_CACHE_LINE_SIZE >> 2):
+ data = (PCI_HEADER_TYPE_CARDBUS << 16);
+ break;
+
+ case (PCI_INTERRUPT_LINE >> 2):
+ /* bridge control */
+ data = (fake_cb_bridge_regs.bridge_control << 16);
+ /* pin:intA line:0xff */
+ data |= (0x1 << 8) | 0xff;
+ break;
+
+ case (PCI_CB_PRIMARY_BUS >> 2):
+ data = (fake_cb_bridge_regs.cb_latency << 24);
+ data |= (fake_cb_bridge_regs.subordinate_busn << 16);
+ data |= (fake_cb_bridge_regs.cardbus_busn << 8);
+ data |= fake_cb_bridge_regs.pci_busn;
+ break;
+
+ case (PCI_CB_MEMORY_BASE_0 >> 2):
+ data = fake_cb_bridge_regs.mem_base0;
+ break;
+
+ case (PCI_CB_MEMORY_LIMIT_0 >> 2):
+ data = fake_cb_bridge_regs.mem_limit0;
+ break;
+
+ case (PCI_CB_MEMORY_BASE_1 >> 2):
+ data = fake_cb_bridge_regs.mem_base1;
+ break;
+
+ case (PCI_CB_MEMORY_LIMIT_1 >> 2):
+ data = fake_cb_bridge_regs.mem_limit1;
+ break;
+
+ case (PCI_CB_IO_BASE_0 >> 2):
+ /* | 1 for 32bits io support */
+ data = fake_cb_bridge_regs.io_base0 | 0x1;
+ break;
+
+ case (PCI_CB_IO_LIMIT_0 >> 2):
+ data = fake_cb_bridge_regs.io_limit0;
+ break;
+
+ case (PCI_CB_IO_BASE_1 >> 2):
+ /* | 1 for 32bits io support */
+ data = fake_cb_bridge_regs.io_base1 | 0x1;
+ break;
+
+ case (PCI_CB_IO_LIMIT_1 >> 2):
+ data = fake_cb_bridge_regs.io_limit1;
+ break;
+ }
+
+ *val = postprocess_read(data, where, size);
+ return PCIBIOS_SUCCESSFUL;
+}
+
+/*
+ * emulate configuration write access on a cardbus bridge
+ */
+static int fake_cb_bridge_write(int where, int size, u32 val)
+{
+ unsigned int reg;
+ u32 data, tmp;
+ int ret;
+
+ ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
+ if (ret != PCIBIOS_SUCCESSFUL)
+ return ret;
+
+ data = preprocess_write(data, val, where, size);
+
+ reg = where >> 2;
+ switch (reg) {
+ case (PCI_COMMAND >> 2):
+ fake_cb_bridge_regs.pci_command = (data & 0xffff);
+ break;
+
+ case (PCI_CB_PRIMARY_BUS >> 2):
+ fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
+ fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
+ fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
+ fake_cb_bridge_regs.pci_busn = data & 0xff;
+ if (fake_cb_bridge_regs.cardbus_busn)
+ fake_cb_bridge_regs.bus_assigned = 1;
+ break;
+
+ case (PCI_INTERRUPT_LINE >> 2):
+ tmp = (data >> 16) & 0xffff;
+ /* disable memory prefetch support */
+ tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
+ tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
+ fake_cb_bridge_regs.bridge_control = tmp;
+ break;
+
+ case (PCI_CB_MEMORY_BASE_0 >> 2):
+ fake_cb_bridge_regs.mem_base0 = data;
+ break;
+
+ case (PCI_CB_MEMORY_LIMIT_0 >> 2):
+ fake_cb_bridge_regs.mem_limit0 = data;
+ break;
+
+ case (PCI_CB_MEMORY_BASE_1 >> 2):
+ fake_cb_bridge_regs.mem_base1 = data;
+ break;
+
+ case (PCI_CB_MEMORY_LIMIT_1 >> 2):
+ fake_cb_bridge_regs.mem_limit1 = data;
+ break;
+
+ case (PCI_CB_IO_BASE_0 >> 2):
+ fake_cb_bridge_regs.io_base0 = data;
+ break;
+
+ case (PCI_CB_IO_LIMIT_0 >> 2):
+ fake_cb_bridge_regs.io_limit0 = data;
+ break;
+
+ case (PCI_CB_IO_BASE_1 >> 2):
+ fake_cb_bridge_regs.io_base1 = data;
+ break;
+
+ case (PCI_CB_IO_LIMIT_1 >> 2):
+ fake_cb_bridge_regs.io_limit1 = data;
+ break;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ /* snoop access to slot 0x1e on root bus, we fake a cardbus
+ * bridge at this location */
+ if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
+ fake_cb_bridge_bus_number = bus->number;
+ return fake_cb_bridge_read(where, size, val);
+ }
+
+ /* a configuration cycle for the device behind the cardbus
+ * bridge is actually done as a type 0 cycle on the primary
+ * bus. This means that only one device can be on the cardbus
+ * bus */
+ if (fake_cb_bridge_regs.bus_assigned &&
+ bus->number == fake_cb_bridge_regs.cardbus_busn &&
+ PCI_SLOT(devfn) == 0)
+ return bcm63xx_do_cfg_read(0, 0,
+ PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
+ where, size, val);
+
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
+ fake_cb_bridge_bus_number = bus->number;
+ return fake_cb_bridge_write(where, size, val);
+ }
+
+ if (fake_cb_bridge_regs.bus_assigned &&
+ bus->number == fake_cb_bridge_regs.cardbus_busn &&
+ PCI_SLOT(devfn) == 0)
+ return bcm63xx_do_cfg_write(0, 0,
+ PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
+ where, size, val);
+
+ return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+struct pci_ops bcm63xx_cb_ops = {
+ .read = bcm63xx_cb_read,
+ .write = bcm63xx_cb_write,
+};
+
+/*
+ * only one IO window, so it cannot be shared by PCI and cardbus, use
+ * fixup to choose and detect unhandled configuration
+ */
+static void bcm63xx_fixup(struct pci_dev *dev)
+{
+ static int io_window = -1;
+ int i, found, new_io_window;
+ u32 val;
+
+ /* look for any io resource */
+ found = 0;
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found)
+ return;
+
+ /* skip our fake bus with only cardbus bridge on it */
+ if (dev->bus->number == fake_cb_bridge_bus_number)
+ return;
+
+ /* find on which bus the device is */
+ if (fake_cb_bridge_regs.bus_assigned &&
+ dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
+ PCI_SLOT(dev->devfn) == 0)
+ new_io_window = 1;
+ else
+ new_io_window = 0;
+
+ if (new_io_window == io_window)
+ return;
+
+ if (io_window != -1) {
+ printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
+ "need IO, which hardware cannot do\n");
+ return;
+ }
+
+ printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
+ (new_io_window == 0) ? "PCI" : "cardbus");
+
+ val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
+ if (io_window)
+ val |= MPI_L2PREMAP_IS_CARDBUS_MASK;
+ else
+ val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
+ bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);
+
+ io_window = new_io_window;
+}
+
+DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
+#endif
projects / openwrt / openwrt.git / blobdiff