ssb: Implement SDIO host bus support

Add support for communicating with a Sonics Silicon Backplane through a
SDIO interface, as found in the Nintendo Wii WLAN daughter card.

The Nintendo Wii WLAN card includes a custom Broadcom 4318 chip with
a SDIO host interface.

Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 57 insertions, 1 deletions

diff --git a/drivers/ssb/main.c b/drivers/ssb/main.c
index 8d16cb258ccf..579b114be412 100644
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -17,6 +17,7 @@
 #include <linux/ssb/ssb_driver_gige.h>
 #include <linux/dma-mapping.h>
 #include <linux/pci.h>
+#include <linux/mmc/sdio_func.h>
 
 #include <pcmcia/cs_types.h>
 #include <pcmcia/cs.h>
@@ -88,6 +89,25 @@ found:
 }
 #endif /* CONFIG_SSB_PCMCIAHOST */
 
+#ifdef CONFIG_SSB_SDIOHOST
+struct ssb_bus *ssb_sdio_func_to_bus(struct sdio_func *func)
+{
+        struct ssb_bus *bus;
+
+        ssb_buses_lock();
+        list_for_each_entry(bus, &buses, list) {
+                if (bus->bustype == SSB_BUSTYPE_SDIO &&
+                    bus->host_sdio == func)
+                        goto found;
+        }
+        bus = NULL;
+found:
+        ssb_buses_unlock();
+
+        return bus;
+}
+#endif /* CONFIG_SSB_SDIOHOST */
+
 int ssb_for_each_bus_call(unsigned long data,
                           int (*func)(struct ssb_bus *bus, unsigned long data))
 {
@@ -469,6 +489,12 @@ static int ssb_devices_register(struct ssb_bus *bus)
                         dev->parent = &bus->host_pcmcia->dev;
 #endif
                         break;
+                case SSB_BUSTYPE_SDIO:
+#ifdef CONFIG_SSB_SDIO
+                        sdev->irq = bus->host_sdio->dev.irq;
+                        dev->parent = &bus->host_sdio->dev;
+#endif
+                        break;
                 case SSB_BUSTYPE_SSB:
                         dev->dma_mask = &dev->coherent_dma_mask;
                         break;
@@ -724,12 +750,18 @@ static int ssb_bus_register(struct ssb_bus *bus,
         err = ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 1);
         if (err)
                 goto out;
+
+        /* Init SDIO-host device (if any), before the scan */
+        err = ssb_sdio_init(bus);
+        if (err)
+                goto err_disable_xtal;
+
         ssb_buses_lock();
         bus->busnumber = next_busnumber;
         /* Scan for devices (cores) */
         err = ssb_bus_scan(bus, baseaddr);
         if (err)
-                goto err_disable_xtal;
+                goto err_sdio_exit;
 
         /* Init PCI-host device (if any) */
         err = ssb_pci_init(bus);
@@ -776,6 +808,8 @@ err_pci_exit:
         ssb_pci_exit(bus);
 err_unmap:
         ssb_iounmap(bus);
+err_sdio_exit:
+        ssb_sdio_exit(bus);
 err_disable_xtal:
         ssb_buses_unlock();
         ssb_pci_xtal(bus, SSB_GPIO_XTAL | SSB_GPIO_PLL, 0);
@@ -825,6 +859,28 @@ int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
 EXPORT_SYMBOL(ssb_bus_pcmciabus_register);
 #endif /* CONFIG_SSB_PCMCIAHOST */
 
+#ifdef CONFIG_SSB_SDIOHOST
+int ssb_bus_sdiobus_register(struct ssb_bus *bus, struct sdio_func *func,
+                             unsigned int quirks)
+{
+        int err;
+
+        bus->bustype = SSB_BUSTYPE_SDIO;
+        bus->host_sdio = func;
+        bus->ops = &ssb_sdio_ops;
+        bus->quirks = quirks;
+
+        err = ssb_bus_register(bus, ssb_sdio_get_invariants, ~0);
+        if (!err) {
+                ssb_printk(KERN_INFO PFX "Sonics Silicon Backplane found on "
+                           "SDIO device %s\n", sdio_func_id(func));
+        }
+
+        return err;
+}
+EXPORT_SYMBOL(ssb_bus_sdiobus_register);
+#endif /* CONFIG_SSB_PCMCIAHOST */
+
 int ssb_bus_ssbbus_register(struct ssb_bus *bus,
                             unsigned long baseaddr,
                             ssb_invariants_func_t get_invariants)