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, 23 insertions, 2 deletions

diff --git a/include/linux/ssb/ssb.h b/include/linux/ssb/ssb.h
index 17ffc1f84d76..3d0a9ff24f01 100644
--- a/include/linux/ssb/ssb.h
+++ b/include/linux/ssb/ssb.h
@@ -238,6 +238,7 @@ enum ssb_bustype {
         SSB_BUSTYPE_SSB,        /* This SSB bus is the system bus */
         SSB_BUSTYPE_PCI,        /* SSB is connected to PCI bus */
         SSB_BUSTYPE_PCMCIA,     /* SSB is connected to PCMCIA bus */
+        SSB_BUSTYPE_SDIO,       /* SSB is connected to SDIO bus */
 };
 
 /* board_vendor */
@@ -270,8 +271,12 @@ struct ssb_bus {
 
         /* The core in the basic address register window. (PCI bus only) */
         struct ssb_device *mapped_device;
-        /* Currently mapped PCMCIA segment. (bustype == SSB_BUSTYPE_PCMCIA only) */
-        u8 mapped_pcmcia_seg;
+        union {
+                /* Currently mapped PCMCIA segment. (bustype == SSB_BUSTYPE_PCMCIA only) */
+                u8 mapped_pcmcia_seg;
+                /* Current SSB base address window for SDIO. */
+                u32 sdio_sbaddr;
+        };
         /* Lock for core and segment switching.
          * On PCMCIA-host busses this is used to protect the whole MMIO access. */
         spinlock_t bar_lock;
@@ -282,6 +287,11 @@ struct ssb_bus {
         struct pci_dev *host_pci;
         /* Pointer to the PCMCIA device (only if bustype == SSB_BUSTYPE_PCMCIA). */
         struct pcmcia_device *host_pcmcia;
+        /* Pointer to the SDIO device (only if bustype == SSB_BUSTYPE_SDIO). */
+        struct sdio_func *host_sdio;
+
+        /* See enum ssb_quirks */
+        unsigned int quirks;
 
 #ifdef CONFIG_SSB_SPROM
         /* Mutex to protect the SPROM writing. */
@@ -336,6 +346,11 @@ struct ssb_bus {
 #endif /* DEBUG */
 };
 
+enum ssb_quirks {
+        /* SDIO connected card requires performing a read after writing a 32-bit value */
+        SSB_QUIRK_SDIO_READ_AFTER_WRITE32       = (1 << 0),
+};
+
 /* The initialization-invariants. */
 struct ssb_init_invariants {
         /* Versioning information about the PCB. */
@@ -366,6 +381,12 @@ extern int ssb_bus_pcmciabus_register(struct ssb_bus *bus,
                                       struct pcmcia_device *pcmcia_dev,
                                       unsigned long baseaddr);
 #endif /* CONFIG_SSB_PCMCIAHOST */
+#ifdef CONFIG_SSB_SDIOHOST
+extern int ssb_bus_sdiobus_register(struct ssb_bus *bus,
+                                    struct sdio_func *sdio_func,
+                                    unsigned int quirks);
+#endif /* CONFIG_SSB_SDIOHOST */
+
 
 extern void ssb_bus_unregister(struct ssb_bus *bus);